CN204967258U - A power output short -circuit protection circuit for USB battery charging outfit - Google Patents
A power output short -circuit protection circuit for USB battery charging outfit Download PDFInfo
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- CN204967258U CN204967258U CN201520742373.6U CN201520742373U CN204967258U CN 204967258 U CN204967258 U CN 204967258U CN 201520742373 U CN201520742373 U CN 201520742373U CN 204967258 U CN204967258 U CN 204967258U
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- oxide
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Abstract
The utility model provides a power output short -circuit protection circuit for USB battery charging outfit, USB power output end connect the drain electrode of P ditch MOS pipe, the drain electrode of the 2nd P ditch MOS of the source connection pipe of P ditch MOS pipe, the source connection of the 2nd P ditch MOS pipe USB fills electrical output, the grid of P ditch MOS pipe and the 2nd P ditch MOS pipe is connected with the first resistance as the pull down resistor, is connected with first electric capacity between the grid of the 2nd P ditch MOS pipe and source electrode, and the collecting electrode of PNP type triode is still connected to the grid that P ditch MOS pipe and the 2nd P ditch MOS managed, the negative pole of stabilivolt is connected to the base of PNP type triode, the positive ground of stabilivolt, the projecting pole of PNP type triode is connected USB fills electrical output. The utility model has the advantages of after USB fills electrical output and the short circuit of USB power output end, make the output voltage of USB power output end maintain normal condition through power output short -circuit protection circuit to protection preceding stage circuit prevents that it from taking place to damage.
Description
Technical field
The utility model relates to USB charging device technical field, particularly relates to a kind of power output short-circuit protection circuit for USB charging device.
Background technology
The function of current electronic equipment gets more and more, and frequency of utilization is more and more higher, has greatly enriched the life of people.When using various electronic equipment in automobile, because the battery durable of electronic equipment is limited in one's ability, therefore onboard navigation system is needed to provide USB charge function, normally realized by a USB charging inlet reserved in onboard navigation system at present, this USB charging inlet exports satisfactory voltage (being generally 5V).
Existing USB charging device all devises protective circuit over the ground, to prevent USB charging end in use because various carelessness shorted to earth, thus plays a protective role in time, prevents from damaging circuit and more serious accident occurring.But existing USB charging end does not also arrange the protective circuit to power supply (on automobile, power supply is generally car battery, and voltage is 9V-16V) short circuit.
Utility model content
The utility model provides a kind of power output short-circuit protection circuit for USB charging device, and after the output of USB charging device is to power supply short circuit, this power output short-circuit protection circuit can protect front stage circuits, prevents it to be damaged.
For achieving the above object, technical solution adopted in the utility model is:
A kind of power output short-circuit protection circuit for USB charging device, its key is: charging between output at USB power source output and USB is connected with an inner P ditch metal-oxide-semiconductor with parasitic diode and the 2nd P ditch metal-oxide-semiconductor, USB power source output connects the drain electrode of a P ditch metal-oxide-semiconductor, the source electrode of the one P ditch metal-oxide-semiconductor connects the drain electrode of the 2nd P ditch metal-oxide-semiconductor, and the source electrode of the 2nd P ditch metal-oxide-semiconductor connects described USB charging output;
The grid of the one P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor is connected with the first resistance as pull down resistor, the first electric capacity is connected with between the grid and source electrode of the 2nd P ditch metal-oxide-semiconductor, one P ditch metal-oxide-semiconductor is also connected the collector electrode of PNP type triode with the grid of the 2nd P ditch metal-oxide-semiconductor, the negative pole of voltage-stabiliser tube is connected after base series second resistance of described PNP type triode, the plus earth of voltage-stabiliser tube, be connected with the 3rd resistance between the base stage of described PNP type triode and emitter, the emitter of described PNP type triode connects described USB charging output.
Further, described USB power source output is also connected one end of the first filter capacitor and the second filter capacitor with the drain electrode of a P ditch metal-oxide-semiconductor, the other end ground connection of the first filter capacitor and the second filter capacitor, the drain electrode of a described P ditch metal-oxide-semiconductor also connects one end of discharge resistance, the other end ground connection of discharge resistance.
Further, described USB charging output and the source electrode of the 2nd P ditch metal-oxide-semiconductor are also connected one end of the 3rd filter capacitor and the 4th filter capacitor, the other end ground connection of the 3rd filter capacitor and the 4th filter capacitor.
Particularly, a described P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor need meet the following conditions: V
gS (TH)<-2V, R
dS (ON)< 60m Ω, I
dbe greater than 2 times of charging current, BV
dSS> V; Described PNP type triode need meet the following conditions: V
cE (sat)>-0.4V, rising and falling time Tr/Tf < 75ns, I
c<-200mA, 100≤h
fE≤ 300.
Particularly, a described P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor model are A03401A, and described PNP triode model is 2N3906.
The beneficial effects of the utility model are:
After the USB of USB charging device charges output and the short circuit of USB power source output; end by making the P ditch metal-oxide-semiconductor in described power output short-circuit protection circuit and the 2nd P ditch metal-oxide-semiconductor; the output voltage of USB power source output maintains normal condition; thus protection front stage circuits, prevent it to be damaged.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the power output short-circuit protection circuit for USB charging device of the present utility model;
Fig. 2 is the circuit diagram of the further enforcement of the power output short-circuit protection circuit for USB charging device of the present utility model;
Fig. 3 is the implementation result schematic diagram of the power output short-circuit protection circuit for USB charging device of the present utility model.
Embodiment
Specifically illustrate execution mode of the present utility model below in conjunction with accompanying drawing, accompanying drawing is only for reference and use is described, does not form the restriction to the utility model scope of patent protection.
As shown in Figure 1, embodiment of the present utility model provides a kind of power output short-circuit protection circuit for USB charging device, circuit structure is: charging between output USB_OUT at USB power source output USB_SOURCE and USB is connected with an inner P ditch metal-oxide-semiconductor Q1 with parasitic diode and the 2nd P ditch metal-oxide-semiconductor Q2, USB power source output USB_SOURCE connects the drain D of a P ditch metal-oxide-semiconductor Q1, the source S of the one P ditch metal-oxide-semiconductor Q1 connects the drain D of the 2nd P ditch metal-oxide-semiconductor Q2, and the source S of the 2nd P ditch metal-oxide-semiconductor Q2 connects described USB charging output USB_OUT;
The grid G of the one P ditch metal-oxide-semiconductor Q1 and the 2nd P ditch metal-oxide-semiconductor Q2 is connected with the first resistance R1 as pull down resistor, the first electric capacity C1 is connected with between the grid G and source S of the 2nd P ditch metal-oxide-semiconductor Q2, one P ditch metal-oxide-semiconductor Q1 is also connected the collector electrode c of PNP type triode Q3 with the grid G of the 2nd P ditch metal-oxide-semiconductor Q2, the base stage b of described PNP type triode Q3 connects and connects the negative pole of voltage-stabiliser tube Z1 after the second resistance R2, the plus earth of voltage-stabiliser tube Z1, the 3rd resistance R3 is connected with between the base stage b of described PNP type triode Q3 and emitter e, the emitter e of described PNP type triode Q3 connects described USB charging output USB_OUT.
In above-mentioned power output short-circuit protection circuit, a P ditch metal-oxide-semiconductor Q1 and the 2nd P ditch metal-oxide-semiconductor Q2 can select A03401A model, and triode Q3 can select 2N3906 model.
One P ditch metal-oxide-semiconductor Q1 and the 2nd P ditch metal-oxide-semiconductor Q2 need meet the following conditions: turn-on condition V
gS (TH)be less than-2V, R
dS (ON)conducting internal resistance is less than 60m Ω, I
dmeet more than 2 times of USB charging requirement, requirement of withstand voltage BV
dSSbe greater than more than 16V;
PNP type triode Q3 need meet the following conditions: V
cE (sat)be greater than-0.4V, Tr/Tf rising and falling time is less than 75ns, I
cbe less than-200mA, h
fEbetween 100 ~ 300 times.
As shown in Figure 2, in embodiment of the present utility model, described USB power source output USB_SOURCE is also connected one end of the first filter capacitor C2 and the second filter capacitor EC1 with the drain D of a P ditch metal-oxide-semiconductor Q1, the other end ground connection of the first filter capacitor C2 and the second filter capacitor EC1, the drain D of a described P ditch metal-oxide-semiconductor Q1 also connects one end of discharge resistance R4, the other end ground connection of discharge resistance R4.
In embodiment of the present utility model, described USB charging output USB_OUT and the source S of the 2nd P ditch metal-oxide-semiconductor Q2 are also connected one end of the 3rd filter capacitor C3 and the 4th filter capacitor C4, the other end ground connection of the 3rd filter capacitor C3 and the 4th filter capacitor C4.
In the present embodiment, the first resistance R1 is 10K, and the second resistance R2, the 3rd resistance R3 and the 4th resistance R4 are 2.2K; First electric capacity C1 is 0.1uF, and the first filter capacitor C2 and the second filter capacitor EC1 is respectively 0.1uF, 100uF, and the 3rd filter capacitor C3 and the 4th filter capacitor C4 is respectively 10uF, 0.1uF;
The rated voltage of voltage-stabiliser tube Z1 is 5.1V, and rated power is 500mW.
The course of work of power output short-circuit protection circuit of the present utility model is:
(1) during normal operating conditions:
When the USB charge function of vehicle mounted guidance is opened, USB power source output USB_SOURCE exports 5V voltage, parasitic diode through a P ditch metal-oxide-semiconductor Q1 and the 2nd P ditch metal-oxide-semiconductor inside exports USB charging output USB_OUT to, due to the effect of pull down resistor (the first resistance R1), pressure reduction between the grid G of a P ditch metal-oxide-semiconductor Q1, the 2nd P ditch metal-oxide-semiconductor Q2 and source S is made to be about 5V, one P ditch metal-oxide-semiconductor Q1 and the 2nd P ditch metal-oxide-semiconductor Q2 saturation conduction, USB charging output USB_OUT normally exports, for external equipment provides charging inlet.
In Fig. 2, the first filter capacitor C2, the second filter capacitor EC1 are respectively 0.1uF, 100uF, are respectively used to High frequency filter and low frequency filtering, and discharge resistance R4 is used for electric discharge; 3rd filter capacitor C3 and the 4th filter capacitor C4 is respectively 10uF, 0.1uF, thus makes USB charging output USB_OUT output voltage more stable (5V).
(2) when charging voltage exports power supply short circuit:
After USB charging output USB_OUT is to power supply short circuit, USB charging output USB_OUT equals 9V ~ 16V (vehicle-mounted supply district is generally 9 ~ 16V, is generally 12V), and 12V voltage is added to USB charging output USB_OUT port.After supply voltage exceeds 6V, due to the avalanche characteristic of voltage-stabiliser tube Z1, PNP type triode Q3 base stage b has electric current to flow through, PNP type triode Q3 conducting, to make between the grid G of the 2nd P ditch metal-oxide-semiconductor Q2 and source S pressure reduction close to 0V, 2nd P ditch metal-oxide-semiconductor Q2 ends, and disconnects the connection with USB power source output USB_SOURCE; Because the input and output electric capacity of PNP type triode Q3 (model is 2N3906) is much smaller than a P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor (model is Q2AO3401A), therefore its conducting speed is greater than the conducting speed of a P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor;
First electric capacity C1 effect is: because PNP type triode Q3 conducting needs certain process and time, in the moment to power supply short circuit, be on the basis of 5V in charging voltage before, when having received power end 12V, continuation is charged, make voltage between the grid G of the 2nd P ditch metal-oxide-semiconductor Q2 and source S two ends equal, the 2nd P ditch metal-oxide-semiconductor Q2 ends.Because metal-oxide-semiconductor switch also has the response time, so add a P ditch metal-oxide-semiconductor Q1 to promote turn-off speed.
Through actual test; after adopting above-mentioned power output short-circuit protection circuit; when USB charges output USB_OUT to the waveform after power supply short circuit as shown in Figure 3, as seen from the figure, the voltage of USB charging output USB_OUT maintains normal condition (about 5V).
Above disclosedly be only preferred embodiment of the present utility model, rights protection scope of the present utility model can not be limited with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (5)
1., for a power output short-circuit protection circuit for USB charging device, it is characterized in that:
Charge between output at USB power source output and USB and be connected with an inner P ditch metal-oxide-semiconductor with parasitic diode and the 2nd P ditch metal-oxide-semiconductor, USB power source output connects the drain electrode of a P ditch metal-oxide-semiconductor, the source electrode of the one P ditch metal-oxide-semiconductor connects the drain electrode of the 2nd P ditch metal-oxide-semiconductor, and the source electrode of the 2nd P ditch metal-oxide-semiconductor connects described USB charging output;
The grid of the one P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor is connected with the first resistance as pull down resistor, the first electric capacity is connected with between the grid and source electrode of the 2nd P ditch metal-oxide-semiconductor, one P ditch metal-oxide-semiconductor is also connected the collector electrode of PNP type triode with the grid of the 2nd P ditch metal-oxide-semiconductor, the negative pole of voltage-stabiliser tube is connected after base series second resistance of described PNP type triode, the plus earth of voltage-stabiliser tube, be connected with the 3rd resistance between the base stage of described PNP type triode and emitter, the emitter of described PNP type triode connects described USB charging output.
2. the power output short-circuit protection circuit for USB charging device according to claim 1; it is characterized in that: described USB power source output is also connected one end of the first filter capacitor and the second filter capacitor with the drain electrode of a P ditch metal-oxide-semiconductor; the other end ground connection of the first filter capacitor and the second filter capacitor; the drain electrode of a described P ditch metal-oxide-semiconductor also connects one end of discharge resistance, the other end ground connection of discharge resistance.
3. the power output short-circuit protection circuit for USB charging device according to claim 2; it is characterized in that: described USB charging output and the source electrode of the 2nd P ditch metal-oxide-semiconductor are also connected one end of the 3rd filter capacitor and the 4th filter capacitor, the other end ground connection of the 3rd filter capacitor and the 4th filter capacitor.
4. the power output short-circuit protection circuit for USB charging device according to any one of claim 1-3, is characterized in that: a described P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor need meet the following conditions: V
gS (TH)<-2V, R
dS (ON)< 60m Ω, I
dbe greater than 2 times of charging current, BV
dSS> V; Described PNP type triode need meet the following conditions: V
cE (sat)>-0.4V, rising and falling time Tr/Tf < 75ns, I
c<-200mA, 100≤h
fE≤ 300.
5. the power output short-circuit protection circuit for USB charging device according to any one of claim 1-3, is characterized in that: a described P ditch metal-oxide-semiconductor and the 2nd P ditch metal-oxide-semiconductor model are A03401A, and described PNP triode model is 2N3906.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520742373.6U CN204967258U (en) | 2015-09-23 | 2015-09-23 | A power output short -circuit protection circuit for USB battery charging outfit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520742373.6U CN204967258U (en) | 2015-09-23 | 2015-09-23 | A power output short -circuit protection circuit for USB battery charging outfit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204967258U true CN204967258U (en) | 2016-01-13 |
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ID=55062299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520742373.6U Active CN204967258U (en) | 2015-09-23 | 2015-09-23 | A power output short -circuit protection circuit for USB battery charging outfit |
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| CN (1) | CN204967258U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276037A (en) * | 2017-07-04 | 2017-10-20 | Tcl通力电子（惠州）有限公司 | Vehicle-mounted USB power source interface protective circuit |
| CN107394851A (en) * | 2017-08-30 | 2017-11-24 | 深圳可立克科技股份有限公司 | Short-circuit protection circuit and battery charger |
-
2015
- 2015-09-23 CN CN201520742373.6U patent/CN204967258U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276037A (en) * | 2017-07-04 | 2017-10-20 | Tcl通力电子（惠州）有限公司 | Vehicle-mounted USB power source interface protective circuit |
| CN107276037B (en) * | 2017-07-04 | 2020-06-09 | Tcl通力电子（惠州）有限公司 | Vehicle-mounted USB power interface protection circuit |
| CN107394851A (en) * | 2017-08-30 | 2017-11-24 | 深圳可立克科技股份有限公司 | Short-circuit protection circuit and battery charger |
| WO2019041591A1 (en) * | 2017-08-30 | 2019-03-07 | 深圳可立克科技股份有限公司 | Fast short-circuit protection circuit at output end of charger |
| CN107394851B (en) * | 2017-08-30 | 2019-08-23 | 深圳可立克科技股份有限公司 | Charger exports terminal shortcircuit fast protection circuit and battery charger |
| US11075517B2 (en) | 2017-08-30 | 2021-07-27 | Shenzhen Click Technology Co., Ltd. | Rapid short-circuit protection circuit of charger at output end and battery charger |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |