CN106965761A - A kind of mobile unit system cut-off protection device - Google Patents
- ️Fri Jul 21 2017
CN106965761A - A kind of mobile unit system cut-off protection device - Google Patents
A kind of mobile unit system cut-off protection device Download PDFInfo
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- CN106965761A CN106965761A CN201610020381.9A CN201610020381A CN106965761A CN 106965761 A CN106965761 A CN 106965761A CN 201610020381 A CN201610020381 A CN 201610020381A CN 106965761 A CN106965761 A CN 106965761A Authority
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- 239000004065 semiconductor Substances 0.000 claims description 34
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- 238000001514 detection method Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
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Abstract
The invention discloses a kind of mobile unit system cut-off protection device, the device is connected with automobile storage battery input, automobile storage battery inputs the input for being connected to voltage reduction module, switch the output of reverse-filling module, automobile power source inputs the input for being connected respectively to voltage comparison module, the output of voltage reduction module, the output of voltage comparison module is connected respectively to the input of switch reverse-filling module, the output of switch reverse-filling module is connected to the input of charging module, the output of charging module, the output of pressure module is connected respectively to the input of super-capacitor module, the output of super-capacitor module is connected to the input of electric discharge isolation module, switch the output of reverse-filling module, the output of electric discharge isolation module is connected to the first input end of MCU module, the output of voltage comparison module is connected to the second input of MCU module.After the device, system can normally be run and normal shutdown when not only ensure that power-off, and cost is low, save hardware resource.
Description
Technical field
The present invention relates to mobile unit technical field, more particularly to a kind of mobile unit system cut-off protection device.
Background technology
Existing mobile unit may lose the power supply of vehicle power in vehicle ignition moment, and power supply unit is derived from ACC power supplys and also may be used Mobile unit system instant cut-off can be caused, system cut-off may cause device damage or loss of data, bring loss.Therefore, Vehicle-mounted embedded type equipment can all consider system protection problem in design.
Traditional method is applied directly in system power supply using reserve battery or super capacitor, and larger position can be taken using reserve battery Put and cost is high, super capacitor is applied directly to not monitor well in system power supply.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, a kind of mobile unit system cut-off protection device is proposed, is realized Quick detection during power-off, and the power-off protection to system is served by the seamless continuous electricity of super capacitor.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of mobile unit system cut-off protection device, including：
Voltage reduction module, receives automobile storage battery and inputs and use DC-DC converter to carry out voltage stabilizing；
Voltage comparison module, automobile storage battery input voltage and system power source voltage are compared, including a voltage comparator；
Reverse-filling module is switched, voltage reduction module output voltage is isolated with system power source voltage, by the defeated of voltage comparison module Go out control, including a metal-oxide-semiconductor, a triode, the first diode；
Super-capacitor module, includes the first super capacitor and the second super capacitor of series connection；
Charging module, is carried out voltage stabilizing to system power supply, super capacitor is charged in the way of current limliting, including a low voltage difference line Property voltage-stablizer；
Pressure module, carries out voltage stabilizing to super-capacitor voltage, prevents electric capacity from overcharging, including the first three-terminal voltage-stabilizing pipe, the two or three end Voltage-stabiliser tube, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance；
Discharged isolation module, and super capacitor output voltage is isolated with system power source voltage, prevents system power source voltage from pouring in down a chimney To super capacitor, including the second diode；
MCU module, is system core CPU, carries out power cut-off detection；
Automobile storage battery inputs the input for being connected to the voltage reduction module, output, the automobile power source input of the switch reverse-filling module The input of the voltage comparison module is connected respectively to, the output of the voltage reduction module, the output of voltage comparison module are connected respectively To the input of the switch reverse-filling module, the output of the switch reverse-filling module is connected to the input of the charging module, institute State the output of charging module, the output of pressure module and be connected respectively to the input of the super-capacitor module, the super capacitor mould The output of block is connected to the input of the electric discharge isolation module, the output of the switch reverse-filling module, electric discharge isolation module it is defeated Go out the first input end for being connected to the MCU module, the output of the voltage comparison module is connected to the second input of MCU module End.
The DC-DC converter connects the drain electrode of the metal-oxide-semiconductor, and first diode cathode is connected with metal-oxide-semiconductor drain electrode, Voltage comparator input in the same direction connects the automobile storage battery input, output end base stage respectively with the triode, described The inputs of MCU second are connected, and the colelctor electrode of the triode is connected with the grid of the metal-oxide-semiconductor, the source electrode point of the metal-oxide-semiconductor Not with the voltage comparator reverse input end, the negative pole of the first diode, the negative pole of the second diode, low pressure difference linearity voltage stabilizing The IN ends and En ends of device, the connection of MCU first input ends, the OUT terminal of the low pressure difference linear voltage regulator is respectively with described second The positive pole of diode, the first super capacitor positive pole, the first three-terminal voltage-stabilizing pipe first end, the connection of the 6th resistance one end, described first Positive pole, the end of the first three-terminal voltage-stabilizing pipe the 3rd, the second three-terminal voltage-stabilizing pipe of the negative pole of super capacitor respectively with second super capacitor First end, the 7th resistance one end, the connection of the 8th resistance one end, the electric 6th resistance other end and first the second end of three-terminal voltage-stabilizing pipe Connection, the 8th resistance other end and the second three-terminal voltage-stabilizing pipe three-terminal link, the 6th resistance and the 7th resistant series, 8th resistance and the 9th resistant series, the emitter stage of the triode, the GND ends of low pressure difference linear voltage regulator, the Two super capacitor negative poles, the end of the second three-terminal voltage-stabilizing pipe the 3rd, the end of voltage comparator the 4th, the 9th resistance other end are grounded.
The voltage comparison module also includes the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th electricity Resistance, the tenth resistance and the 11st resistant series are connected between automobile storage battery input and ground, and the one of the tenth resistance End is connected with the positive input of the voltage comparator, and the 12nd resistance is connected to the 13rd resistant series Between the source electrode and ground of metal-oxide-semiconductor, the reverse input end of one end of the 12nd resistance and voltage comparator is connected, and described the 14 resistance one end connect voltage comparator output end, and the other end connects the 5th end of the voltage comparator, metal-oxide-semiconductor respectively Source electrode.
The switch reverse-filling module also includes first resistor, second resistance, 3rd resistor, and the first resistor is connected to described Between the source electrode and grid of metal-oxide-semiconductor, the second resistance is connected between the voltage comparator and the transistor base, The 3rd resistor is connected between the base stage of the triode and emitter stage.
The charging module also includes the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 4th resistance, the 5th resistance, 4th resistance is connected between the low pressure difference linear voltage regulator OUT terminal and BYP ends, second electric capacity and the 5th resistance It is connected to after parallel connection between the BYP ends of the low pressure difference linear voltage regulator and ground, the 3rd electric capacity is in parallel with the 4th electric capacity It is connected to afterwards between the OUT terminal of the low pressure difference linear voltage regulator and ground, first capacitance connection is steady in the low pressure difference linearity Between depressor U1 En ends and ground.
The voltage comparator is in-phase voltage comparator.
The metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.
The triode is NPN triode.
The beneficial effect that the technical scheme that the present invention is provided is brought is：Reserve battery is not needed, space is saved, cost is reduced； Mobile unit power supply is unstable and unexpected power-off in the case of can ensure system normally operation and normal shutdown；Realize equipment Data continuity and loss protection when power supply falls and happened suddenly power-off.
The present invention is described in further detail below in conjunction with drawings and Examples, but a kind of mobile unit system of the present invention is broken Electrical protective device is not limited to embodiment.
Brief description of the drawings
Fig. 1 is the structured flowchart of apparatus of the present invention；
Fig. 2 is the physical circuit figure of apparatus of the present invention.
Embodiment
As shown in figure 1, in the present embodiment, a kind of mobile unit system cut-off protection device, the protection device and automobile storage battery are defeated Enter connection, described protection device include voltage reduction module 1, voltage comparison module 2, switch reverse-filling module 3, charging module 4, Electric discharge isolation module 5, super-capacitor module 6, pressure module 7, MCU module 8, automobile storage battery input are connected to voltage reduction module 1 input, output, the automobile power source input of the switch reverse-filling module 3 are connected respectively to the input of voltage comparison module 2, The output of the voltage reduction module 1, the output of voltage comparison module 2 are connected respectively to the input of switch reverse-filling module 3, described The output of switch reverse-filling module 3 is connected to the input of charging module 4, the output of the charging module 4, pressure module 7 Output be connected respectively to the input of super-capacitor module 6, the output of the super-capacitor module 6 is connected to electric discharge isolation module 5 input, the output of the switch reverse-filling module 3, the output for the isolation module 5 that discharges are connected to the input of MCU module 8 End 1, the output of the voltage comparison module 2 is connected to the input 2 of MCU module 8.
Specifically, as shown in Fig. 2 the voltage reduction module includes DC-DC converter V1；The voltage comparison module includes electricity Press comparator A1, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th Resistance R14；The switch reverse-filling module include metal-oxide-semiconductor Q1, triode Q2, the first diode D1, first resistor R1, Second resistance R2,3rd resistor R3；The charging module includes low pressure difference linear voltage regulator U1, the 4th resistance R4, the 5th electricity Hinder R5, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4；The electric discharge isolation module is by second Diode D2 is constituted；The super-capacitor module includes the first super capacitor C5, the second super capacitor C6；The pressure module Including the first three-terminal voltage-stabilizing pipe D3, the second three-terminal voltage-stabilizing pipe D4, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, Resistance R9.
Specifically, the automobile storage battery input is connected with DC-DC converter V1 input, the DC-DC converter V1 Drain D of the output end respectively with diode D1 positive poles, metal-oxide-semiconductor Q1 be connected, the automobile storage battery input passes through resistance R10 It is connected with voltage comparator A1 inputs in the same direction 3, the source S of the metal-oxide-semiconductor Q1 passes through resistance R12 and voltage comparator A1 reverse input ends 2 are connected, and the resistance R10 and resistance R11 are connected in series between automobile storage battery input and ground, described Resistance R12 and resistance R13 are connected in series between metal-oxide-semiconductor Q1 source S and ground, and the voltage comparator A1's is defeated Go out end 1 to be connected with MCU first input ends, be connected by resistance R2 with triode Q2 base stage B, divided by resistance R14 Source S not with the ends of voltage comparator A1 the 5th, metal-oxide-semiconductor Q1 is connected, the colelctor electrode C and MOS of the triode Q2 Pipe Q1 grid G connection, Q2 emitter E is connected by resistance R3 with base stage B, the source S of the metal-oxide-semiconductor Q1 It is connected by resistance R1 with grid G, the metal-oxide-semiconductor Q1 is in parallel with diode D1, metal-oxide-semiconductor Q1 source S is respectively with two Pole pipe D1 negative poles, diode D2 negative poles, low pressure difference linear voltage regulator U1 IN ends, low pressure difference linear voltage regulator U1 EN End, the connection of MCU first input ends, the low pressure difference linear voltage regulator U1 are in parallel with diode D2, low pressure difference linear voltage regulator U1 OUT terminal respectively with diode D2 positive poles, super capacitor C5 positive poles, the ends of three-terminal voltage-stabilizing pipe D3 the 1st, resistance R6 One end is connected, and is connected by resistance R4 with low pressure difference linear voltage regulator U1 BYP ends, the electric capacity C2 is in parallel with resistance R5 It is connected between low pressure difference linear voltage regulator U1 BYP ends and ground, is connected to after the electric capacity C3 is in parallel with electric capacity C4 low afterwards Between pressure difference linear voltage regulator U1 OUT terminal and ground, the super capacitor C5 connects with super capacitor C6, and three end is steady Pressure pipe D3 connects with three-terminal voltage-stabilizing pipe D4, the resistance R6, resistance R7, resistance R8, resistance R9 series connection, the resistance It is in parallel with three-terminal voltage-stabilizing pipe D3, super capacitor C5 respectively after R6, R7 series connection, described resistance R8, R9 connect after respectively with three Hold voltage-stabiliser tube D4, super capacitor C6 in parallel, the super capacitor C5 negative poles respectively with super capacitor C6 positive poles, three-terminal voltage-stabilizing The ends of pipe D3 the 3rd, the ends of three-terminal voltage-stabilizing pipe D4 the 1st, the ends of resistance R7 second, the connection of resistance R8 first ends, the resistance R6 Second end is connected with the ends of three-terminal voltage-stabilizing pipe D3 the 2nd, and the ends of resistance R8 second are connected with the ends of three-terminal voltage-stabilizing pipe D4 the 2nd, institute State triode Q2 emitter Es, low pressure difference linear voltage regulator U1 GND ends, super capacitor C6 negative poles, three-terminal voltage-stabilizing pipe D4 3rd end, the ends of voltage comparator A1 the 4th, the ends of resistance R9 second are grounded.
Further, the voltage comparator A1 is in-phase voltage comparator.
Further, the metal-oxide-semiconductor Q1 is P-channel metal-oxide-semiconductor.
Further, the triode Q2 is NPN triode.
With reference to Fig. 1 and Fig. 2, the course of work of mobile unit system cut-off protection device is analyzed in detail below.Wherein, noun is fixed Justice is as follows：
Automobile storage battery is inputted：For the power input of system power supply；
System power supply：The power supply powered for MCU module, during automobile storage battery normal power supply, the voltage stabilizing electricity inputted by automobile storage battery Pressure is provided, when automobile storage battery powers abnormal, is discharged and provided by super capacitor.
Voltage reduction module 1 is using DC-DC converter V1, it is preferred that for by automobile storage battery input voltage voltage stabilizing to 5.2V.
Voltage comparison module 2 uses voltage comparator A1, it is preferred that LM358X voltage comparators can be used, and it is defeated in the same direction It is voltage to be measured to enter end 3, is provided by automobile storage battery input voltage, voltage on the basis of its reverse input end 2 is carried by system power supply For voltage comparator A1 judges whether to power off and control metal-oxide-semiconductor according to the threshold values of setting；
Resistance R14 is pull-up resistor, it is preferred that its resistance value is 4.7k Ω, and resistance R12, R13 are divider resistance, preferably , resistance R12 is 39k Ω, and resistance R13 is 10k Ω, and input voltage is made through resistance R12, R13 partial pressure for 1.02V On the basis of voltage, resistance R10, R11 be automobile storage battery input divider resistance, it is preferred that resistance R10 be 39k Ω, electricity Resistance R11 is 8.66k Ω, when partial pressure value is higher than 1.02V, voltage comparator A1 output high level 1, when partial pressure value is less than During 1.02V, voltage comparator A1 output low levels 0.
Switch reverse-filling module 3 is isolated DC-DC converter V1 output voltage with system power source voltage, prevents electricity Overwhelm the other equipment for being poured into automobile storage battery front end, increase equipment super capacitor is powered burden, and switch reverse-filling module 3 is by voltage The output control of comparison module 2, in parallel using P-channel metal-oxide-semiconductor and Schottky diode, in high-current circuit, metal-oxide-semiconductor rises Arrive that pressure drop is small, reduced the effect of diode power consumption.When voltage comparison module 2 is output as high level 1, triode Q2 Conducting, metal-oxide-semiconductor Q1 conductings；When voltage comparison module 2 is output as low level 0, triode work Q2 cut-offs, metal-oxide-semiconductor Q1 ends, it is preferred that triode Q2 model BC817-25.
Resistance R1 is pull-up resistor, and resistance R3 is pull down resistor, and resistance R2 is divider resistance, it is preferred that R1 is 10k Ω, resistance R2 are 24k Ω, and resistance R3 is 10k Ω.
Charging module 4 uses low pressure difference linear voltage regulator U1, is fed back by resistance R4, resistance R5 partial pressures, and system power supply is steady 5.0V is depressed into, is charged in the way of current limliting as super capacitor, it is preferred that MIC5205 low pressure difference linearity voltage stabilizings may be selected Device, resistance R4 is 6.8k Ω, and resistance R5 is 22k Ω；Electric capacity C1, C2, C3, C4 are filter capacitor, it is preferred that Electric capacity C1 is 1uF, and electric capacity C2 is 470pF, and ceramic condenser C3 is 10uF/16V (T), and electric capacity C4 is 0.1uF.
Super-capacitor module 6 is composed in series by 2 10F/2.7V super capacitor C5, super capacitor C6.
Super capacitor C5, super capacitor C6 voltage are distinguished voltage stabilizing in below 2.6V by pressure module 7, prevent electric capacity from overcharging Super capacitor is caused to fail, it is preferred that to be controlled using three-terminal voltage-stabilizing pipe D3, three-terminal voltage-stabilizing pipe D4, specifically, passing through Resistance R6, resistance R7 partial pressures, voltage stabilizing is carried out to three-terminal voltage-stabilizing pipe D3 in below 2.6V, protection super capacitor C5 two ends electricity Weighing apparatus is flattened in below 2.6V；By resistance R8, resistance R9 partial pressures, voltage stabilizing is carried out to three-terminal voltage-stabilizing pipe D4 in below 2.6V, Super capacitor C6 both end voltages balance is protected in below 2.6V, it is preferred that resistance R6, R8 are 10k Ω, resistance R6, R8 is 200k Ω.
The isolation module 5 that discharges uses diode D2, on the other hand will be super on the one hand as the discharge diode of super capacitor Electric capacity output voltage is isolated with system power source voltage, prevents system power source voltage from pouring in down a chimney to super capacitor.
MCU module 8 is system core CPU, and first port reception system power input provides for mobile unit normal work Power supply, second port receiving voltage comparator A1 output carries out system cut-off detection, when receiving voltage comparator A1 When exporting high level 1, MCU module is judged as that level is powered normally, continues normal work；Work as voltage ratio when receiving power-off When exporting low level 0 compared with device A1, MCU module decision level is powered abnormal, and from super capacitor power taking and at once storage is weighed Data are wanted, subsequently into shutdown process.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the spirit and principles in the present invention it Interior, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (8)
1. a kind of mobile unit system cut-off protection device, it is characterised in that including：
For receiving the voltage reduction module that automobile storage battery inputs and uses DC-DC converter to carry out voltage stabilizing；For automobile storage battery to be inputted The voltage comparison module that voltage is compared with system power source voltage；For voltage reduction module output voltage and system power source voltage to be entered The switch reverse-filling module of row isolation；Super-capacitor module；For carrying out voltage stabilizing to system power supply, to super in the way of current limliting The charging module that electric capacity is charged；For carrying out voltage stabilizing, the pressure module for preventing electric capacity from overcharging to super-capacitor voltage；For Super capacitor output voltage is isolated with system power source voltage, prevent system power source voltage pour in down a chimney electric discharge to super capacitor every From module；For for system core CPU, carrying out the MCU module of power cut-off detection；
Automobile storage battery inputs the input for being connected to the voltage reduction module, output, the automobile power source input of the switch reverse-filling module The input of the voltage comparison module is connected respectively to, the output of the voltage reduction module, the output of voltage comparison module are connected respectively To the input of the switch reverse-filling module, the output of the switch reverse-filling module is connected to the input of the charging module, institute State the output of charging module, the output of pressure module and be connected respectively to the input of the super-capacitor module, the super capacitor mould The output of block is connected to the input of the electric discharge isolation module, the output of the switch reverse-filling module, electric discharge isolation module it is defeated Go out the first input end for being connected to the MCU module, the output of the voltage comparison module is connected to the second input of MCU module End.
2. mobile unit system cut-off protection device according to claim 1, it is characterised in that：
The voltage reduction module includes a DC-DC converter；The voltage comparison module includes a voltage comparator；The switch is anti- Pouring in down a chimney module includes a metal-oxide-semiconductor, a triode and the first diode；The super-capacitor module includes the first super electricity of series connection Hold and the second super capacitor；The charging module includes a low pressure difference linear voltage regulator；It is steady that the pressure module includes the one or three end Pressure pipe, the second three-terminal voltage-stabilizing pipe, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance；The electric discharge isolation module bag Include the second diode；
The DC-DC converter connects the drain electrode of the metal-oxide-semiconductor, and first diode cathode is connected with metal-oxide-semiconductor drain electrode, Voltage comparator input in the same direction connects the automobile storage battery input, output end base stage respectively with the triode, described The inputs of MCU second are connected, and the colelctor electrode of the triode is connected with the grid of the metal-oxide-semiconductor, the source electrode point of the metal-oxide-semiconductor Not with the voltage comparator reverse input end, the negative pole of the first diode, the negative pole of the second diode, low pressure difference linearity voltage stabilizing The IN ends and En ends of device, the connection of MCU first input ends, the OUT terminal of the low pressure difference linear voltage regulator is respectively with described second The positive pole of diode, the first super capacitor positive pole, the first three-terminal voltage-stabilizing pipe first end, the connection of the 6th resistance one end, described first Positive pole, the end of the first three-terminal voltage-stabilizing pipe the 3rd, the second three-terminal voltage-stabilizing pipe of the negative pole of super capacitor respectively with second super capacitor First end, the 7th resistance one end, the connection of the 8th resistance one end, the electric 6th resistance other end and first the second end of three-terminal voltage-stabilizing pipe Connection, the 8th resistance other end and the second three-terminal voltage-stabilizing pipe three-terminal link, the 6th resistance and the 7th resistant series, 8th resistance and the 9th resistant series, the emitter stage of the triode, the GND ends of low pressure difference linear voltage regulator, the Two super capacitor negative poles, the end of the second three-terminal voltage-stabilizing pipe the 3rd, the end of voltage comparator the 4th, the 9th resistance other end are grounded.
3. mobile unit system cut-off protection device according to claim 2, it is characterised in that：
The voltage comparison module also includes the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th electricity Resistance, the tenth resistance and the 11st resistant series are connected between automobile storage battery input and ground, and the one of the tenth resistance End is connected with the positive input of the voltage comparator, and the 12nd resistance is connected to the 13rd resistant series Between the source electrode and ground of metal-oxide-semiconductor, the reverse input end of one end of the 12nd resistance and voltage comparator is connected, and described the 14 resistance one end connect voltage comparator output end, and the other end connects the 5th end of the voltage comparator, metal-oxide-semiconductor respectively Source electrode.
4. mobile unit system cut-off protection device according to claim 2, it is characterised in that：
The switch reverse-filling module also includes first resistor, second resistance, 3rd resistor, and the first resistor is connected to described Between the source electrode and grid of metal-oxide-semiconductor, the second resistance is connected between the voltage comparator and the transistor base, The 3rd resistor is connected between the base stage of the triode and emitter stage.
5. mobile unit system cut-off protection device according to claim 2, it is characterised in that：
The charging module also includes the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 4th resistance, the 5th resistance, 4th resistance is connected between the low pressure difference linear voltage regulator OUT terminal and BYP ends, second electric capacity and the 5th resistance It is connected to after parallel connection between the BYP ends of the low pressure difference linear voltage regulator and ground, the 3rd electric capacity is in parallel with the 4th electric capacity It is connected to afterwards between the OUT terminal of the low pressure difference linear voltage regulator and ground, first capacitance connection is steady in the low pressure difference linearity Between depressor U1 En ends and ground.
6. mobile unit system cut-off protection device according to claim 1, it is characterised in that：The voltage comparator For in-phase voltage comparator.
7. mobile unit system cut-off protection device according to claim 1, it is characterised in that：The metal-oxide-semiconductor is P Channel MOS tube.
8. mobile unit system cut-off protection device according to claim 1, it is characterised in that：The triode is NPN Triode.
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| CN201610020381.9A CN106965761B (en) | 2016-01-13 | 2016-01-13 | Power-off protection device for vehicle-mounted equipment system |
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| CN201610020381.9A CN106965761B (en) | 2016-01-13 | 2016-01-13 | Power-off protection device for vehicle-mounted equipment system |
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| CN109470910A (en) * | 2018-07-02 | 2019-03-15 | 金华八达集团有限公司科技信息分公司 | A kind of power distribution network power loss detection system and method |
| WO2019109361A1 (en) * | 2017-12-08 | 2019-06-13 | 深圳市柔宇科技有限公司 | Charging circuit and electronic device |
| CN110032263A (en) * | 2019-04-15 | 2019-07-19 | 苏州浪潮智能科技有限公司 | A kind of server and its power-down protection circuit |
| CN110209233A (en) * | 2019-06-03 | 2019-09-06 | 长沙优力电驱动系统有限公司 | Power module |
| CN110509772A (en) * | 2018-05-22 | 2019-11-29 | 联合汽车电子有限公司 | Accessory power supply |
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| CN113258648B (en) * | 2021-06-17 | 2021-12-07 | 浙江富特科技股份有限公司 | Circuit for preventing battery voltage loss of output side of vehicle-mounted DCDC converter |
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| CN114006462A (en) * | 2021-11-01 | 2022-02-01 | 浙江天正电气股份有限公司 | Power-off protection circuit, electronic equipment and power-off protection method |
| CN114006462B (en) * | 2021-11-01 | 2024-03-22 | 浙江天正电气股份有限公司 | Power-off protection circuit, electronic equipment and power-off protection method |
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