CN203933582U - A kind of switching circuit that reduces shutdown electric leakage - Google Patents
A kind of switching circuit that reduces shutdown electric leakage Download PDFInfo
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- CN203933582U CN203933582U CN201420378289.6U CN201420378289U CN203933582U CN 203933582 U CN203933582 U CN 203933582U CN 201420378289 U CN201420378289 U CN 201420378289U CN 203933582 U CN203933582 U CN 203933582U
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Abstract
The utility model discloses a kind of switching circuit that reduces shutdown electric leakage, comprise resistance R 3-R5, the load switch U1 of low on-resistance, PNP transistor Q1, for the button K1 that starts shooting/shut down; The VIN pin of R4 one end, R5 one end, U1 all connects cell voltage VBATO, the R4 other end connects Q1 emitter, Q1 base stage connects the R5 other end, R3 one end, K1 one end, the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system, the VOUT pin connected system supply power voltage VBAT of U1, the R3 other end connects the PWRKEY pin for system switching machine, the equal ground connection of GND pin of the K1 other end, U1.This programme is realized the power-off between circuit system and battery by simple load switch and peripheral gadget thereof, realizes with low cost the object that reduction system is leaked electricity, improved properties of product.
Description
Technical field
The utility model relates to electronic product field, relates in particular to a kind of switching circuit that reduces shutdown electric leakage.
Background technology
Most electronic product is all not power-off, even if be that battery is also connected under electronic product shutdown situation with circuit system, even also probably very soon battery electric quantity is depleted because of system electric leakage under the state that between battery and system, not power-off meeting causes resistance product to shut down.For example mobile phone, cell phone platform is due to circuit complexity conventionally, and system electric leakage is higher.
For this problem, existing solution is disconnection/connection that increase toggle switch is realized battery and circuit system; But use toggle switch volume larger, and be limited to and conventionally can be subject to product appearance or structure, be not suitable for the Miniaturization Design of the electronic product such as mobile phone, intelligent wearing equipment.
Utility model content
The purpose of this utility model is to propose a kind of switching circuit that reduces shutdown electric leakage, can the electric leakage of reduction system.
For reaching this object, the utility model by the following technical solutions:
A switching circuit that reduces shutdown electric leakage, comprises resistance R 3-R5, the load switch U1 of low on-resistance, and PNP transistor Q1, for the button K1 that starts shooting/shut down; The VIN pin of R4 one end, R5 one end, U1 all connects cell voltage VBATO, the R4 other end connects Q1 emitter, Q1 base stage connects the R5 other end, R3 one end, K1 one end, the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system, the VOUT pin connected system supply power voltage VBAT of U1, the R3 other end connects the PWRKEY pin for system switching machine, the equal ground connection of GND pin of the K1 other end, U1.
Wherein, also comprise diode D1, D2, the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system by D2; Wherein, D1 anodic bonding is for the PWRKEY pin of system switching machine, and D1 negative electrode connects the R3 other end, and the EN pin of Q1 collector electrode, U1 connects D2 negative electrode, the GPIO pin of D2 anodic bonding system.
Wherein, described D1, D2 are Schottky diode.
Wherein, also comprise resistance R 1, R2; Wherein, R1 one end, R2 one end all connect the EN pin of U1, and the R2 other end connects USB supply power voltage VCHG, R1 other end ground connection.
Wherein, also comprise diode D4; D4 anodic bonding USB supply power voltage VCHG, D4 negative electrode connects the R2 other end.
Wherein, R1 is the resistance of 230K Ω, and R2 is the resistance of 100K Ω, and D4 is Schottky diode.
Wherein, described U1 is NCP330 load switch, and Q1 is the PNP transistor of MMBT3906T_2013 model, and R3 is the resistance of 1K Ω, and R4 is the resistance of 100K Ω, and R5 is the resistance of 100K Ω.
The beneficial effects of the utility model are: circuit structure is simple, volume is little, realize the power-off between circuit system and battery by simple load switch, PNP transistor and peripheral gadget thereof; And it is low to realize cost, in the situation that not increasing too many product cost, realize the electricity leakage power dissipation of reduction system, improve properties of product.Leak electricity by effectively reduction system of this switching circuit, and then greatly extend the remaining time of battery electric quantity under electronic product off-mode; Without using toggle switch, applied widely.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing described below is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram of the switching circuit of the reduction shutdown electric leakage that provides of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, technical scheme in the utility model embodiment is carried out to clear, complete description, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
As shown in Figure 1, the switching circuit of the reduction shutdown electric leakage that the present embodiment provides comprises: resistance R 3-R5, and the load switch U1 of low on-resistance, PNP transistor Q1, for the button K1 that starts shooting/shut down.Wherein, the VIN pin of R4 one end, R5 one end, U1 all connects cell voltage VBATO, the R4 other end connects Q1 emitter, Q1 base stage connects the R5 other end, R3 one end, K1 one end, the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system, the VOUT pin connected system supply power voltage VBAT of U1, the R3 other end connects the PWRKEY pin for system switching machine, the equal ground connection of GND pin of the K1 other end, U1.
Based on the electronic product of the present embodiment switching circuit, under normal circumstances, when K1 does not press, Q1 and U1 are all in off state, when start, press K1, allow U1 conducting, now battery can be given system power supply, because PWRKEY button is now dragged down simultaneously, system starts, and GP configuring IO draws high, and makes U1 conducting always.When shutdown, directly press K1, PWRKEY pin level drags down with normal shutdown, now closes GPIO and decontrols K1, system cut-off.
Preferably, in the present embodiment, key is that the conducting resistance (Rds) of load switch U1 must be enough little, makes the pressure drop on U1 as far as possible little, and when shutoff, electric leakage is very little; Otherwise have larger power consumption and pressure drop consumption on U1.
As a preferred implementation of the present utility model, described U1 is the load switch NCP330 of ON Semiconductor Corporation, Q1 is the PNP transistor of MMBT3906T_2013 model, R3 is the resistance of resistance sizes 1K Ω, R4 is the resistance of resistance sizes 100K Ω, and R5 is the resistance of resistance sizes 100K Ω.
By the switching circuit of the present embodiment, make, in the situation that not increasing outside toggle switch, not changing former resistance product switching on and shutting down button operation, to realize the power-off between battery and circuit system, prevent from occurring electric leakage situation in electronic product shutdown situation.
Further, in order to prevent that electric current from pouring in down a chimney, the switching circuit of the present embodiment also comprises diode D1, D2, and the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system by D2; Wherein, D1 anodic bonding is for the PWRKEY pin of system switching machine, and D1 negative electrode connects the R3 other end, and the EN pin of Q1 collector electrode, U1 connects D2 negative electrode, the GPIO pin of D2 anodic bonding system.Preferably, the D1 adopting in the present embodiment, the Schottky diode that D2 is one-way conduction, and the conduction voltage drop of D1, D2 is lower, reverse leakage is low.
Further, be in power-off situation based on said switching circuit system closedown state, for the charge mode of the electronic product platforms such as compatible mobile phone, the switching circuit of the present embodiment also comprises resistance R 1, R2; Wherein, R1 one end, R2 one end all connect the EN pin of U1, and the R2 other end connects USB supply power voltage VCHG, R1 other end ground connection.Increase thus the part of VCHG conducting system, and do not affected system normal switch machine.
As a preferred implementation of the present utility model, R1 resistance sizes is 230K Ω, and R2 resistance sizes is 100K Ω.
Preferably, in order to prevent that electric current from pouring in down a chimney, in the utility model embodiment, also comprise diode D4; D4 anodic bonding USB supply power voltage VCHG, D4 negative electrode connects the R2 other end.Preferably, the D4 adopting in the present embodiment is the Schottky diode of one-way conduction, and the conduction voltage drop of D4 is lower, reverse leakage is low.
It should be noted that, above-mentioned component parameter, is only a preferred implementation of the present utility model, and the utility model can also have other execution mode, such as, load switch U1, transistor Q1 can select other model; For different applied environments, person of an ordinary skill in the technical field, according to common practise, without creative work, can adjust component parameter.
The switching circuit of the utility model above-described embodiment, simple in structure, volume is little, realizes the power-off between circuit system and battery by simple load switch and peripheral gadget thereof; And it is low to realize cost, in the situation that not increasing too many product cost, realize the electricity leakage power dissipation of reduction system, improve properties of product.Can avoid using toggle switch by this switching circuit, but also can reach the effect of system cut-off simultaneously, effectively reduction system is leaked electricity (electric leakage is less than 1uA), then greatly extends the remaining time of battery electric quantity under electronic product off-mode.
Finally it should be noted that: above embodiment is only for the technical solution of the utility model is described but not be limited, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can be modified or be equal to replacement the technical solution of the utility model, and these amendments or be equal to replacement and also can not make amended technical scheme depart from the spirit and scope of technical solutions of the utility model.
Claims (7)
1. a switching circuit that reduces shutdown electric leakage, is characterized in that, comprises resistance R 3-R5, the load switch U1 of low on-resistance, and PNP transistor Q1, for the button K1 that starts shooting/shut down; The VIN pin of R4 one end, R5 one end, U1 all connects cell voltage VBATO, the R4 other end connects Q1 emitter, Q1 base stage connects the R5 other end, R3 one end, K1 one end, the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system, the VOUT pin connected system supply power voltage VBAT of U1, the R3 other end connects the PWRKEY pin for system switching machine, the equal ground connection of GND pin of the K1 other end, U1.
2. the switching circuit of reduction shutdown electric leakage according to claim 1, is characterized in that, also comprise diode D1, D2, the EN pin of Q1 collector electrode, U1 is connected with the GPIO pin of system by D2; Wherein, D1 anodic bonding is for the PWRKEY pin of system switching machine, and D1 negative electrode connects the R3 other end, and the EN pin of Q1 collector electrode, U1 connects D2 negative electrode, the GPIO pin of D2 anodic bonding system.
3. the switching circuit of reduction shutdown electric leakage according to claim 2, is characterized in that, described D1, D2 are Schottky diode.
4. the switching circuit of reduction shutdown electric leakage according to claim 2, is characterized in that, also comprises resistance R 1, R2; Wherein, R1 one end, R2 one end all connect the EN pin of U1, and the R2 other end connects USB supply power voltage VCHG, R1 other end ground connection.
5. the switching circuit of reduction shutdown electric leakage according to claim 4, is characterized in that, also comprises diode D4; D4 anodic bonding USB supply power voltage VCHG, D4 negative electrode connects the R2 other end.
6. the switching circuit of reduction shutdown electric leakage according to claim 5, is characterized in that, R1 is the resistance of 230K Ω, and R2 is the resistance of 100K Ω, and D4 is Schottky diode.
7. the switching circuit of reduction shutdown electric leakage according to claim 1, is characterized in that, described U1 is NCP330 load switch, Q1 is the PNP transistor of MMBT3906T_2013 model, R3 is the resistance of 1K Ω, and R4 is the resistance of 100K Ω, and R5 is the resistance of 100K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420378289.6U CN203933582U (en) | 2014-07-09 | 2014-07-09 | A kind of switching circuit that reduces shutdown electric leakage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420378289.6U CN203933582U (en) | 2014-07-09 | 2014-07-09 | A kind of switching circuit that reduces shutdown electric leakage |
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| CN203933582U true CN203933582U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420378289.6U Active CN203933582U (en) | 2014-07-09 | 2014-07-09 | A kind of switching circuit that reduces shutdown electric leakage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505720A (en) * | 2016-11-15 | 2017-03-15 | 深圳天珑无线科技有限公司 | A kind of on-off circuit and terminal unit for solving shutdown electric leakage |
| CN110932706A (en) * | 2019-11-19 | 2020-03-27 | 广东天波信息技术股份有限公司 | Control circuit for avoiding shutdown leakage current of intelligent hardware |
-
2014
- 2014-07-09 CN CN201420378289.6U patent/CN203933582U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505720A (en) * | 2016-11-15 | 2017-03-15 | 深圳天珑无线科技有限公司 | A kind of on-off circuit and terminal unit for solving shutdown electric leakage |
| CN110932706A (en) * | 2019-11-19 | 2020-03-27 | 广东天波信息技术股份有限公司 | Control circuit for avoiding shutdown leakage current of intelligent hardware |
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