CN204205673U - A kind of automobile USB charging device - Google Patents

A kind of USB power supply unit being applied to vehicle mounted multimedia product of the utility model, particularly relates to a kind of automobile USB charging device.Described power-supply controller of electric at least comprises mode pins, the input of described mode pins is connected with the output of described single-chip microcomputer, the DCP charge mode of the corresponding described USB charging device of low level state of described mode pins, the CDP charge mode of the corresponding described USB charging device of high level state of described mode pins.Compared with prior art, the utility model has the following advantages: first: charging rapidly, solves some problem of charging slowly or not of charging; Second: compatible good, the product of most of main brand in the market can be given, bring great convenience to the charging of people on automobile; 3rd: circuit is built simply, and feasibility is strong; 4th: with low cost.The price of the TPS2546 chip mentioned in the utility model is about 0.3 U.S. dollar.

A kind of automobile USB charging device

Technical field

A kind of USB power supply unit being applied to vehicle mounted multimedia product of the utility model, particularly relates to a kind of automobile USB charging device.

Background technology

At present, along with the high speed development of car industry, what automobile electronics played for the comfortableness aspect of satisfied driving plays increasing effect, more and more be subject to the attention of car load factory and information entertainment supplier, according to investigations, present most vehicle-mounted information and entertainment system all has mobile phone interconnecting function, hardware aspect is as HDL etc., software aspect is as mirrorlink etc., can mobile phone picture be projected on display, complete the operation of some amusement aspects, now the energy consumption of mobile equipment such as mobile phone or pad amount can sharply increase, and needs often to carry out USB charging.

According to BC1.2 rechargeable standard, USB charging has Three models, and they are SDP (standard downstream port), CDP (charging downstream Port) and DCP(Dedicated charging port respectively) pattern.Wherein SDP can provide maximum 500mA electric current when USB2.0, can provide the electric current of maximum 1A when USB3.0, can simultaneous communications and charging; CDP can provide maximum 1.5A electric current, can simultaneous communications and charging, and the maximum 2.0A electric current that can provide of DCP, can not communication.

But USB interface output current inside current good multi-vehicle-type is more fixing, major part exports with the standard of 5V1A, compatible poor, some is only applicable to Android mobile phone, run into i Phone just can not charge, do not have the function of voltage detecting after some electric energy is full of, cause overshoot, cell-phone heating is serious; It is slow to there is charging in some mobile phone because not meeting standard when charging, or charging heating, or the situation of not charging.In addition, the mobile phone of present main flow is all compatible CDP, but has the i Phone before some such as IOS6.0 systems to also have the incompatible CDP of some old-fashioned Android mobile phone, and these equipment insert our vehicle-mounted information and entertainment system, inspection is not measured, can not charge.

Summary of the invention

For above problem, the purpose of this utility model is to provide a kind of scheme can be able to charged to the charging terminal of DCP and CDP pattern to meet the needs of the various mobile phones of passenger.

The utility model is achieved in that a kind of vehicle-mounted USB charging device, comprises the single-chip microcomputer of vehicle power, single-chip microcomputer voltage-releasing voltage stabilizer, power-supply controller of electric voltage-releasing voltage stabilizer, power-supply controller of electric and the described power-supply controller of electric of control.Described power-supply controller of electric at least comprises mode pins and monitoring pin, the input of described mode pins is connected with the output of described single-chip microcomputer, the DCP charge mode of the corresponding described USB charging device of low level state of described mode pins, the CDP charge mode of the corresponding described USB charging device of high level state of described mode pins, can reach the conversion between different charge mode by above-mentioned adjustment.The output of described monitoring pin is connected with the input of described single-chip microcomputer, the function of described monitoring pin is mainly used to detect load current, when electric current is greater than 100mA, keep fast mold filling formula always, when mobile phone is charged to more than 90% or be full of, or mobile device is extracted, and at this moment monitors the load current that pin detects and can drop to below 50mA, at this moment mode pins is drawn high by single-chip microcomputer, and chip gets back to CDP operating state.

Further technical scheme of the present utility model is: described power-supply controller of electric comprises main current limliting pin, secondary current limliting pin and grounding pin, described main current limliting pin is connected with grounding pin respectively with time current limliting pin, main current-limiting resistance is connected with between described main current limliting pin and grounding pin, be connected with time current-limiting resistance between described current limliting pin and grounding pin, described two resistance play metering function to described vehicle-mounted USB charging equipment.The excessive destruction to charging terminal of electric current or prevent short circuit when can prevent voltage instability.

Further technical scheme of the present utility model is: described power-supply controller of electric comprises positive pin and negative pin, described positive pin and negative pin respectively with different voltage, with this meet connection needs charging distinct device.

Further technical scheme of the present utility model is: the model of the USB charging control switch of described USB charging device is TPS2546.The cost of this chip is very low, can reduce holistic cost significantly.

Further technical scheme of the present utility model is: the model of the single-chip microcomputer of described USB charging device is STM32f103.The cost of this chip is very low, can reduce holistic cost significantly.

Further technical scheme of the present utility model is: the model of the step-down stabilizer of described USB charging device is LV13603.The cost of this chip is very low, can reduce holistic cost significantly.

Further technical scheme of the present utility model is: the model of the step-down stabilizer of described USB charging device is TP57A6003.The cost of this chip is very low, can reduce holistic cost significantly.

Compared with prior art, the utility model has compatible good advantage, to the object of the product charging of most of main brand in the market, can bring great convenience to the charging of people on automobile by changing between different charge mode thus reaching.

Accompanying drawing explanation

Fig. 1 is the system block diagram of the automobile USB charging device that the utility model embodiment provides.

Fig. 2 is the power-supply controller of electric winding diagram of the automobile USB charging device that the utility model embodiment provides.

Fig. 3 is the external equipment model testing circuit schematic diagram of the automobile USB charging device that the utility model embodiment provides.

Embodiment

The utility model proposes a kind of charging scheme simultaneously with CDP+DCP two kinds of charge modes, can by judging type of cell phone to export corresponding electric current, and switch filling soon between DCP and CDP two kinds of charge modes, reach the quick charged object of intelligence.

First, the overall structure of composition graphs 1 to a kind of vehicle-mounted USB charging equipment provided by the utility model is described.

A vehicle-mounted USB charging device, comprises vehicle power 1, single-chip microcomputer voltage-releasing voltage stabilizer 2, power-supply controller of electric voltage-releasing voltage stabilizer 3, power-supply controller of electric 4 and the single-chip microcomputer 5 controlling described power-supply controller of electric.The model of described power-supply controller of electric 4 is TPS2546.Described power-supply controller of electric 4 the voltage that is suitable for be 5V, the model of the single-chip microcomputer 5 of described USB charging device is STM32f103, described single-chip microcomputer 5 the voltage that is suitable for be 3.3V, above voltage by vehicle power 1 by reaching after single-chip microcomputer voltage-releasing voltage stabilizer 3 and power-supply controller of electric voltage-releasing voltage stabilizer 4 step-down; The model of the power-supply controller of electric voltage-releasing voltage stabilizer 3 be connected with described power-supply controller of electric 4 is LV13603, the model of the single-chip microcomputer voltage-releasing voltage stabilizer 2 be connected with described single-chip microcomputer 5 is TP57A6033, by these two step-down stabilizers make voltage from the beginning vehicle power 1 12V voltage drop to be suitable for the voltage 5V of power-supply controller of electric 4 and single-chip microcomputer 5 the voltage 3.3V that is suitable for.The price of each chip is all very cheap above, is suitable for the holistic cost that these designs can reduce equipment significantly.

Accompanying drawing 2 is winding diagrams of described power-supply controller of electric 4.Be described below in conjunction with the principle of accompanying drawing 2 to described USB charging device.

Described power-supply controller of electric 4 at least comprises mode pins and monitoring pin, the input of described mode pins is connected with the output of described single-chip microcomputer, the DCP charge mode of the corresponding described USB charging device of low level state of described mode pins, the CDP charge mode of the corresponding described USB charging device of high level state of described mode pins, can reach the conversion between different charge mode by above-mentioned adjustment.The output of described monitoring pin is connected with the input of described single-chip microcomputer, the function of described monitoring pin is mainly used to detect load current, when electric current is greater than 100mA, keep fast mold filling formula always, when mobile phone is charged to more than 90% or be full of, or mobile device is extracted, and at this moment monitors the load current that pin detects and can drop to below 50mA, at this moment mode pins is drawn high by single-chip microcomputer, and chip gets back to CDP operating state.

In present case, described power-supply controller of electric 4 comprises and mainly comprises four control pins, they are respectively CTR1 pin, CTR2 pin, CTR3 pin, ILIM_SEL pin, the operating state of low and high level these 16 kinds of chips corresponding of these four pins.The mode pins that we mention in the utility model is CTR1 pin, and the control pin CTR1 pin only related to wherein, so we directly draw high the level of CTR2 pin, CTR3 pin, ILIM_SEL pin three pins, then by CTR1 pin access single-chip microcomputer.When systems axiol-ogy inserts to having USB flash disk or mobile device, acquiescence uses CDP pattern, if cannot read in 10 seconds, represent that this equipment can not identify, do not support USB communication, this situation mainly contains following several reason, and one is that the incompatible CDP of mobile phone or model are comparatively old, and second what be that mobile phone opens is fast mold filling formula.

Described monitoring pin is the STATUS pin on circuit diagram 2 in the present embodiment, the output of described STATUS pin is connected with the input of described single-chip microcomputer, the function of described STATUS pin is mainly used to detect load current, when electric current is greater than 100mA, keep fast mold filling formula always, when mobile phone is charged to more than 90% or be full of, or mobile device is extracted, at this moment the load current that STATUS pin detects can drop to below 50mA, at this moment CTR1 pin is drawn high by single-chip microcomputer, makes power-supply controller of electric 4 enter DCP pattern.

Described power-supply controller of electric 4 also comprises main current limliting pin, secondary current limliting pin and grounding pin, they are respectively ILIM_LO pin, ILIM_HI pin and GND pin by pin corresponding in fig. 2.Described ILIM_LO pin is connected with GND pin respectively with ILIM_HI pin, main current-limiting resistance is connected with between described ILIM_LO pin and GND pin, described main current-limiting resistance in fig. 2 corresponding resistance is R1, time current-limiting resistance is connected with between described ILIM_HI pin and grounding pin, described current-limiting resistance in fig. 2 corresponding resistance is R2, and described two resistance R1, R2 play metering function to described vehicle-mounted USB charging equipment.When ILIM_SET pin is drawn high, ILIM_HI pin institute connecting resistance R2 plays a part to limit maximum current, if ILIM_SET pin drags down, ILIM_LO pin connect resistance R1 and play metering function.Maximum current can be limited in below 1.5A with the resistance of 30K Ω by us, the excessive destruction to charging terminal of electric current or prevent short circuit when can prevent voltage instability.

In addition, because apple equipment connects positive pin D+ and negative pin D-required voltage is different, being respectively D+ pin is 2V, D-pin is 2.7V, if do not reach this state, apple equipment can judge to think that this charging wire or charger are not original-pack charging devices, thus charge closing and communication function.For above problem, we are provided with mobile phone model monitoring pin.The pin of their correspondence is respectively positive pin D+ pin and negative pin D-pin in the present embodiment.As shown in Figure 3, we distinguish apple equipment and other equipment with positive pin D+ pin and negative pin D-pin two pins.Power-supply controller of electric 4 can detect the equipment of insertion automatically, when the equipment needing charging is apple equipment, power-supply controller of electric 4 can be set to 2.0V by the load voltage of D+ pin automatically, and the load voltage of D-pin is set to 2.7V, makes mobile phone can not charge closing and communication function.Identical therewith, the judgement of other Android systems also has corresponding standard.

The improvement to existing vehicle-mounted USB charging equipment according to above-described embodiment that the utility model embodiment provides, enough large charging current can be provided again to charge to described peripheral apparatus while the exchanges data that it can be made to meet between multiple peripheral apparatus and described vehicle-mounted USB charging equipment, the range of application of existing vehicle-mounted USB charging equipment can be expanded like this.Compared with prior art, the utility model has the following advantages: first: charging rapidly, solves some problem of charging slowly or not of charging; Second: compatible good, the product of most of main brand in the market can be given, bring great convenience to the charging of people on automobile; 3rd: circuit is built simply, and feasibility is strong; 4th: with low cost.The price of the TPS2546 chip mentioned in the utility model is about 0.3 U.S. dollar.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.