CN207039219U - A kind of optional multichannel current automatic adaptation charging device of priority - Google Patents

The utility model provides a kind of optional multichannel current automatic adaptation charging device of priority, including MCU Logic control modules and priority control module and multiple charging circuits；The charging circuit is used to charge to the charge target of insertion；The priority control module is used for the priority for setting each charging circuit, and signal priority corresponding to transmission；The MCU Logic control modules are used for the plug state for detecting each charging circuit, and the charging current of each charging circuit is distributed according to priority.By setting priority and according to priority height, adaptive adjustment is carried out to the charging current of each target to be charged in actual use, quick charge task can be completed using low power adapter according to the actual requirements, finally realize cost-effective, operation is flexible, the products scheme of human oriented design.

Multi-channel current self-adaptive charging device with selectable priority

Technical Field

The utility model relates to an electrical apparatus technical field, more specifically relates to a multichannel electric current self-adaptation charging device that priority is optional.

Background

In the prior art, mobile electronic devices are more and more, and due to the requirements of electric storage capacity and long-time use of the mobile devices, charging devices are required to be frequently used for charging, and in the actual use process, a plurality of targets to be charged or one charging target and a standby power supply thereof are often charged simultaneously, so that people often need to preferentially charge the devices which are preferentially used.

Such as pda (personal Digital assistant), also known as palm top computer, can help people to work, study, and entertain while on the move. Classified by use, into industrial-grade PDAs and consumer-product PDAs. The industrial-grade PDA is mainly applied to the industrial field, and a common bar code scanner, an RFID reader-writer, a POS machine and the like can be called as the PDA; the PDA requires a battery to maintain normal operation, and the PDA uses a lithium ion battery or an alkaline battery as its power source, and the PDA using an alkaline battery as its power source is rare, such as ACER S10, PLAM 100, SONY PEG SL-10, and most of the PDA power sources use a lithium ion battery.

At present, the internet of things industry PDA mainly uses three types of seat charging equipment, the first: only supporting the battery charging, the device needs to take out the detachable lithium battery of the PDA, then place the lithium battery in the clamping groove of the charging base for charging, and then install the lithium battery in the PDA again for use after the charging is finished, thus leading to poor user experience; the second type only supports PDA charging, and the device only has a PDA charging slot and no battery charging slot. When the way that a customer wants to charge the spare battery is not feasible during using the PDA, the lithium battery must be loaded into the PDA to be charged, which affects the use efficiency of the PDA. And the third is that: the high-power charging adapter is required to be equipped for achieving the purpose of large-current quick charging of the lithium battery and the PDA at the same time, so that the size of the adapter is enlarged, the cost is increased, when the PDA and the lithium battery are not inserted into the clamping groove for charging at the same time, the high-power charger is particularly wasted, and the user cost is obviously increased. In addition, the equipment cannot select to charge the PDA preferentially, and the charging current of the lithium battery and the PDA cannot be adjusted according to the actual situation, so that the whole scheme is not reasonable.

SUMMERY OF THE UTILITY MODEL

The utility model provides an overcome above-mentioned problem or solve the optional multichannel electric current self-adaptation charging device of priority of above-mentioned problem at least partially, solved and to have can not carry out the problem of the priority adjustment of charging according to the in-service use condition among the current multichannel charging circuit.

According to an aspect of the present invention, there is provided a multi-path charging device, comprising an MCU logic control module, a priority control module, and a plurality of charging circuits;

the charging circuit is used for charging the inserted charging target;

the priority control module is used for setting the priority of each charging circuit and sending a corresponding priority signal;

the MCU logic control module is used for detecting the plugging and unplugging states of the charging circuits and distributing the charging currents of the charging circuits according to the priority.

Preferably, the plurality of charging circuits comprise a PDA charging circuit and a lithium battery charging circuit;

the PDA charging circuit is connected with a PDA charging control module, and the PDA charging control module is used for controlling the on/off of the PDA charging circuit, the charging current setting of the PDA charging circuit and the detection of whether the PDA is effectively connected with the charging circuit.

The lithium battery charging circuit comprises a lithium battery charging control module, wherein the lithium battery charging control module is used for controlling the opening or closing of the lithium battery charging circuit, detecting the charging state of the lithium battery and adjusting the current of the lithium battery charging circuit. .

Preferably, the MCU logic control module detects the charging priority states of the PDA charging circuit and the lithium battery charging circuit in real time through pri _ PDA and pri _ BAT; the lithium battery charging circuit is turned on or turned off through a BAT _ EN signal; detecting whether the lithium battery is in a charging state, a full state or an unplugged state through BAT _ CH and BAT _ ST signals; controlling the connection and disconnection of a PDA charging path through a PDA _ control signal; the magnitude of the PDA charging current is detected by the Pad _ current signal.

Preferably, the MCU logic control module comprises a microcontroller, a first infrared sensor and a second infrared sensor; the microcontroller is an STM32F103C8T6 microcontroller, pins BOOT0 and BOOT1 of the microcontroller are pulled down to be grounded through resistors, and an NRST pin of the microcontroller is pulled up to be connected with a power supply through a resistor;

the pin 26 of the microcontroller is connected with a priority control signal pri _ PDA of the PDA; a pin 27 of the microcontroller is connected with a priority control signal pri _ BAT of the lithium battery;

the 32 pins of the microcontroller are connected with the 4 pins of the first infrared sensor; a pin 33 of the microcontroller is connected with a pin of the second infrared sensor; a pin 25 of the microcontroller is connected with a pin 2 of the first infrared sensor; and a pin 31 of the microcontroller is connected with a pin 2 of the second infrared sensor.

Preferably, the PDA charging control module includes a self-recovery fuse, an operational amplifier circuit, a P-type MOS transistor, a first N-type triode, a second N-type triode, and a third N-type triode, wherein a non-inverting input terminal of the operational amplifier circuit is connected to a negative terminal of the PDA charging circuit, a drain of the P-type MOS transistor is connected to a PDA + signal of the PDA charging circuit, a base of the first N-type triode is connected to a PDA _ control signal of the MCU logic control module, a base of the second N-type triode is connected to a D + _ ctr signal of the MCU logic control module, a base of the third N-type triode is connected to a D _ ctr signal of the MCU logic control module, and an amplifying output terminal of the operational amplifier circuit is connected to a Pad _ current signal of the MCU logic control module.

Preferably, the lithium battery charging control module comprises a lithium battery charging control chip, a fourth N-type triode, a fifth N-type triode, a sixth N-type triode and a lithium battery charging seat; the lithium battery charging control chip is a TP4056 charging control chip, and the lithium battery charging seat is a CBA-2503T-75 lithium battery charging seat;

the base electrode of the fourth N-type triode is connected with the pin 30 of the MCU logic control module, the base electrode of the fifth N-type triode is connected with the pin 43 of the MCU logic control module, the base electrode of the sixth N-type triode is connected with the pin 45 of the MCU logic control module, the pin 7 of the lithium battery charging control chip is connected with the pin 29 of the MCU logic control module, and the pin 6 of the lithium battery charging control chip is connected with the pin 28 of the MCU logic control module; the 5 pins of the lithium battery charging control chip are connected with the 3 pins of the lithium battery charging seat; and the pin 1 of the lithium battery charging control chip is connected with the pin 2 of the lithium battery charging seat.

Preferably, the device further comprises a power management module, wherein the power management module comprises a first connector, a second connector and an LDO chip, and power input pins of the first connector and the second connector are connected; the input end of the LDO chip is connected with the first connector and the second connector, and the output end of the LDO chip is connected with a power signal of the MCU logic control circuit.

Preferably, the base comprises a base main body, a base front panel, a base rear panel and a base cover plate;

the base main body is provided with charging slots corresponding to the charging circuits;

the base front panel is provided with a display lamp and an indicator lamp, wherein the display lamp and the indicator lamp are respectively used for displaying the base power management module;

the rear panel of the base is provided with a DC socket, a Micro USB socket and a priority switch, and the priority switch is connected with the priority control module.

The application provides a multichannel electric current self-adaptation charging device that priority is optional, through setting up the priority and according to the priority height, carries out adaptive adjustment to the charging current of each target of waiting to charge among the in-service use process, can utilize low-power adapter to accomplish the quick charge task according to actual demand, finally realizes saving cost, the flexible operation, humanized design's product scheme.

Drawings

Fig. 1 is a schematic structural diagram of a multi-path charging device according to an embodiment of the present invention;

fig. 2 is a block diagram of a multi-path charging device according to an embodiment of the present invention;

fig. 3 is a circuit diagram of an MCU logic control module according to an embodiment of the present invention;

fig. 4 is a circuit diagram of a priority control signal according to an embodiment of the present invention;

fig. 5 is a detection circuit diagram of a PDA infrared sensor according to an embodiment of the present invention;

fig. 6 is a circuit diagram of a power input interface according to an embodiment of the present invention;

fig. 7 is a circuit diagram of an LDO power conversion circuit according to an embodiment of the present invention;

fig. 8 is a circuit diagram of a lithium battery charging control module according to an embodiment of the present invention;

fig. 9 is a circuit diagram of a PDA charging control module according to an embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 and fig. 2, the multi-path charging device is shown in the figure, which comprises an MCU logic control module, a priority control module and a plurality of charging circuits;

the charging circuit is used for charging the inserted charging target;

the priority control module is used for setting the priority of each charging circuit and sending a corresponding priority signal;

the MCU logic control module is used for detecting the plugging and unplugging states of the charging circuits and distributing the charging currents of the charging circuits according to the priority.

Preferably, the plurality of charging circuits comprise a PDA charging circuit and a lithium battery charging circuit;

the PDA charging circuit is connected with a PDA charging control module, and the PDA charging control module is used for controlling the on/off of the PDA charging circuit, the charging current setting of the PDA charging circuit and the detection of whether the PDA is effectively connected with the charging circuit.

The lithium battery charging circuit comprises a lithium battery charging control module, wherein the lithium battery charging control module is used for controlling the opening or closing of the lithium battery charging circuit, detecting the charging state of the lithium battery and adjusting the current of the lithium battery charging circuit.

The multi-channel charging device in the embodiment further comprises a base main body, a base front panel, a base rear panel, a base cover plate, a lithium battery charging control module, a PDA charging control module, an MCU logic control module and a power management module. The system also comprises a priority control module which is used for setting the charging priority of the PDA and the lithium battery and sending pri _ PDA and pri _ BAT priority control signals.

The base main body is connected with the base front panel, the base rear panel and the base cover plate;

the power management module is connected with the base rear panel, the MCU logic control module, the PDA charging control module and the lithium battery charging control module.

The MCU logic control module is connected with the lithium battery charging control module, the PDA charging control module and the base rear panel;

the base main body is connected with the PDA charging control module;

the base main body in the device of the embodiment is used for providing a charging slot for the PDA and the lithium battery, and the left side and the right side of the midpoint of the bottom of the PDA slot are respectively provided with a hole site for the insertion and extraction of the PDA for infrared detection.

The base front panel is mainly used for indicating the charging state of the seat charging source and the lithium battery, and displays the brightness of the seat charging source indicator lamp and the brightness of the lithium battery charging indicator lamp on the front panel through the light guide columns respectively. The seat charging power supply indicator lamp adopts a monochromatic lamp, the power supply indicator lamp displays red after the seat is charged, and otherwise, the indicator lamp is turned off; the battery charging state indicator lamp adopts a double-color lamp, the red color is displayed during the charging of the battery, the green color is displayed after the battery is fully charged, and the indicator lamp is turned off after the battery is pulled out.

The base rear panel is mainly used for providing a 5V adapter power supply DC socket, a Micro USB socket and a priority switch. Two hole sites are arranged on one side of the rear panel and respectively correspond to the DC seat and the Micro USB seat on the PCB. Two priority switch are installed on the other side of the battery, the two switches are respectively used for selecting the charging priority of the PDA and the lithium battery, the switch defaults to be in a low-priority state, the switch is switched to be in a high-priority state after being pressed, if the two states are consistent, the PDA and the lithium battery are charged at the same time, otherwise, the charging is carried out sequentially according to the priority sequence.

The lithium battery charging control module is mainly used for controlling the on or off of the lithium battery charging process; detecting the charging state of the lithium battery; and adjusting the charging current of the lithium battery.

The PDA charging control module is mainly used for controlling the conduction and the closing of a PDA charging channel; controlling the setting of the charging current of the PDA; and detecting whether the PDA is effectively connected with the charging loop.

The MCU logic control module is mainly used for controlling the priority of the PDA and the lithium battery, controlling a lithium battery charging indicator lamp, detecting the plugging state of the lithium battery and detecting the plugging state of the PDA.

The MCU logic control module of the embodiment detects the plugging state of the PDA and the lithium battery in real time, and when a newly inserted object to be charged is detected, the charging scheme is re-decided. For example, when a newly inserted object to be charged is detected, the MCU logic control circuit firstly judges the priority states of the lithium battery and the PDA, when the priority states of the lithium battery and the PDA are inconsistent, the lithium battery and the PDA are respectively charged by respective maximum current according to the priority sequence, and if the high-priority clamping groove is empty or full, the high-priority clamping groove is automatically switched to the object to be charged with low priority; when the priority states of the adapter and the target object are consistent, if the adapter and the target object are inserted into the card slot to wait for charging, the adapter charging current is reasonably distributed by the moderate charging current, and if only one target object to be charged is detected, the adapter is charged by the maximum charging current of the target object to be charged. When the scheme is used for the low-power adapter, the charging current can be distributed adaptively and reasonably, the customer experience can be improved, and the production cost can be reduced.

Specifically, the product housing comprises a base main body, a base front panel, a base rear panel and a base cover plate. The base main body is provided with two charging slots, one is used for vertical charging of the PDA, and the other is used for horizontal charging of the lithium battery. The front panel of the base is provided with two light indicating holes, one light indicating hole is used for a base power supply indicating lamp, and when a 5V power supply is connected to the base, the indicating lamp displays red; the other is used for displaying the charging state of the lithium battery, the red color is displayed when the lithium battery is charged, the green color is displayed after the lithium battery is fully charged, and the lamp is turned off when the battery is not inserted. The rear panel of the base comprises a 5V DC socket, a 5V Micro USB socket, a PDA charging priority selection switch and a lithium battery charging priority selection switch, wherein the DC socket and the Micro USB socket are used for meeting power adapters of different interfaces, the PDA charging priority selection switch defaults to be in a low priority state, and is switched to be in a high priority state after being pressed down, and similarly, the lithium battery charging priority selection switch defaults to be in the low priority state and is switched to be in the high priority state after being pressed down.

Specifically, the MCU logic control module mainly includes a microcontroller U17, as shown in fig. 3, the microcontroller is STM32F103C8T6, and further includes a red light emitting diode D55, resistors R106, R107, R108, R1, R2, a first infrared sensor U22, a second infrared sensor U23, and TVS tubes D61, D62, D63, and D64.

The BOOT0 and the BOOT1 pins of the microcontroller are pulled down to the ground through the R107 and R108 resistors; the NRST pin of the microcontroller is connected with VCC3 through a resistor R106 in a pull-up mode; the pin 31 of the microcontroller is connected with a BAT _ EN signal of the lithium battery charging control module; the pin 30 of the microcontroller is connected with a BAT _ CH signal of the lithium battery charging control module; a pin 29 of the microcontroller is connected with a BAT _ ST signal of the lithium battery charging control module; the pin 2 of the microcontroller is connected with a PDA _ control signal of the PDA charging control module; the pin 17 of the microcontroller is connected with a Pad _ current signal of the PDA charging control module; the pin 12 of the microcontroller is connected with a D + _ ctr signal of the PDA charging control module; the pin 13 of the microcontroller is connected with a D-ctr signal of the PDA charging control module; the pin 10 of the microcontroller is connected with a D + _ mini signal of the power management module; the pin 11 of the microcontroller is connected with a D- _ mini signal of the power management module;

as shown in fig. 4, pin 26 of the microcontroller is connected to the PDA charging priority control signal pri _ PDA; a pin 27 of the microcontroller is connected with a lithium battery charging priority control signal pri _ BAT;

as shown in fig. 5, the 32 pins of the microcontroller are connected with the 4 pins of the first infrared sensor U22; a pin 33 of the microcontroller is connected with a pin 4 of a second infrared sensor U23; a pin 25 of the microcontroller is connected with a pin 2 of a first infrared sensor U22; a pin 31 of the microcontroller is connected with a pin 2 of a second infrared sensor U23;

after the base is electrified, the power indicator lamp displays red. The MCU detects whether the PDA is inserted into the card slot or not in real time through two infrared sensors, namely a first infrared sensor U22 and a second infrared sensor U23; the MCU detects the charging priority states of the PDA and the lithium battery in real time through Pri _ PDA and Pri _ BAT, i.e. a Primary Rate Interface (Pri _ Rate Interface); the MCU turns on or turns off the lithium battery charging management IC through the BAT _ EN signal; the MCU detects whether the lithium battery is in a charging state, a full state or an unplugged state through BAT _ CH and BAT _ ST signals; the MCU controls the connection and disconnection of a PDA charging path through a PDA _ control signal; the MCU detects the magnitude of the charging current of the PDA through the Pad _ current signal;

specifically, the power management module includes a first connector CON1, a second connector J12, TVS transistors D56 and D60, capacitors C129, C130, C134, C135, C125, C126, C127 and C128, resistors R120, R121 and R122, and an LDO chip U20.

As shown in fig. 6, the first connector CON1 and the second connector J12 of the power management module are connected to each other through power input pins, and both provide VCC5 power to the lithium battery charging control module and the PDA charging control module; the first connector CON1 and the second connector J12 also provide VCC5 power input to pin 1 of the LDO chip;

as shown in fig. 7, the input end of the LDO chip U20 is connected to the connectors CON1 and J12, and the output end is connected to the power signal of the MCU.

The scheme has two power access modes, wherein one mode is to input a 5V2A power supply through a Micro USB interface CON1, and the other mode is to input a 5V2A power supply through a DC interface J12; one path of the 5V power supply is used for charging the PDA, the second path is used for charging the lithium battery, and the third path is used for converting 5V into 3.3V through the LDO chip U20 and is used for the MCU working power supply.

Specifically, the lithium battery charging control module comprises a bicolor light-emitting diode D52, an N-type triode, a fourth N-type triode Q4, a fifth N-type triode Q5, a sixth N-type triode Q6, a lithium battery charging chip U18, resistors R109, R110, R111, R112, R113 and R114, TVS tubes D53 and D54, capacitors C123 and C124 and a lithium battery charging seat J41. Wherein,

as shown in fig. 8, the base of the fourth diode Q4 is connected to pin 30 of the MCU, and the base of the fifth transistor Q5 is connected to pin 43 of the MCU; the base electrode of the sixth triode Q6 is connected with the pin 45 of the MCU; the 7 pin of the U18 is connected with the 29 pin of the MCU; the 6 pins of the U18 are connected with the 28 pins of the MCU; pins 6 and 7 of the U18 are respectively connected with the cathode of the double-color light-emitting diode through a 220 ohm resistor; the 5 pins of the U18 are connected with the 3 pins of the lithium battery charging seat; the 1 pin of the U18 is connected with the 2 pins of the lithium battery charging seat;

the MCU indirectly controls the enabling and the forbidding of the U18 chip by controlling the base level of the fourth triode Q4, the lithium battery can be charged and the battery state can be detected after the U18 chip is enabled, and the lithium battery is stopped from being charged and the lithium battery state cannot be detected after the U18 chip is forbidden. When the lithium battery starts to be charged, a pin 7 of the U18 outputs a low level, a red light of the D52 is lightened, and a pin 29 of the MCU acquires a falling edge charging signal and stores the current state of the lithium battery; when the lithium cell was full of, U18's 7 feet output high level, 6 feet output low level, and at this moment, D52's green light bright red light goes out, and MCU's 28 feet can gather the full falling edge pulse of battery, and MCU is inside to be full of with switching into in the lithium cell state by charging. The MCU indirectly controls the charging current of the U8 to the lithium battery by controlling the base electrode levels of the fifth N-type triode Q5 and the sixth N-type triode Q6, and when the base electrode of the fifth N-type triode Q5 is at a high level and the base electrode of the sixth N-type triode Q6 is at a low level, the charging current of the battery is 1A; when the base of the fifth N-type transistor Q5 is at low level and the base of the sixth N-type transistor Q6 is at high level, the battery charging current is 500 mA.

Specifically, the PDA charging control module includes a self-recovery fuse F2, an operational amplifier U21, a P-type MOS transistor U19, a first N-type transistor Q3, a second N-type transistor Q7, a third N-type transistor Q8, and TVS transistors D57, D58, and D59. Wherein,

as shown in fig. 9, the non-inverting input terminal of the op-amp is connected to the negative terminal of the PDA; the source electrode of the P-type MOS tube is connected with a VCC5 power supply through a 0 ohm resistor; the drain electrode of the P-type MOS tube is connected with a PDA + signal; the base electrode of the first N-type triode Q3 is connected with a PDA _ control signal of the MCU; the base electrode of the N-type triode is connected with a PDA _ control signal of the MCU; and the amplification output end of the operational amplifier U21 is connected with a Pad _ current signal of the MCU.

When the MCU control module detects that the PDA is plugged in through the infrared sensor and detects that the PDA is in a high priority state or the PDA and the PDA are in the same priority state, firstly, the PDA _ control signal is output to high level, the triode Q3 is conducted, at the moment, the grid electrode of the P-type MOS tube U19 is grounded, the source electrode and the drain electrode are conducted, and a 5V charging power supply is provided for the PDA charging base contact J14. And meanwhile, the MCU determines the charging current of the PDA by judging the charging priority states of the PDA and the lithium battery, and then configures the charging current of the PDA by using the base levels of Q7 and Q8. In addition, the voltage value of Pad _ current is detected at the instant when the U19 is turned on, the current value flowing through the self-recovery fuse F2 is detected by using the voltage value, and whether the PDA is effectively connected to the base charging card slot or not is judged according to the current value. In addition, the current value of F2 can detect whether the PDA is full, when the PDA is full, the PDA _ control signal outputs low level, the P type MOS tube is closed, and the PDA charging path is cut off.

The application provides a multichannel electric current self-adaptation charging device that priority is optional, through setting up the priority and according to the priority height, carries out adaptive adjustment to the charging current of each target of waiting to charge among the in-service use process, can utilize low-power adapter to accomplish the quick charge task according to actual demand, finally realizes saving cost, the flexible operation, humanized design's product scheme.

Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.