CN102063170A - Circuit for removing shutdown leakage current of electronic products - Google Patents
Circuit for removing shutdown leakage current of electronic products Download PDFInfo
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- CN102063170A CN102063170A CN2010105434032A CN201010543403A CN102063170A CN 102063170 A CN102063170 A CN 102063170A CN 2010105434032 A CN2010105434032 A CN 2010105434032A CN 201010543403 A CN201010543403 A CN 201010543403A CN 102063170 A CN102063170 A CN 102063170A
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Abstract
The invention provides a circuit for removing shutdown leakage current of electronic products, which comprises a first triode, a second triode, a first resistor, a second resistor, a third triode and a diode, wherein the drain electrode of the first triode is connected with the anode of a battery to be used as a power input end, and the source electrode of the first triode is connected with the source electrode of the second triode; the drain electrode of the second triode is used as an output end of a battery power supply; two grid electrodes of the first triode and the second triode are connected, one end of the first resistor is connected with two source electrodes of the first and the second triodes and the other end is connected with two grid electrodes of the first and the second triodes; the collector electrode of the third triode is connected with two grid electrodes of the first and the second triodes, the base electrode of the third triode is connected with a first control signal output by the electronic product through the second resistor, the emitter electrode of the third triode is grounded, the anode of the diode is connected with two grid electrodes of the first and the second triodes and the cathode of the diode is connected with a second control signal output by an electronic product.
Description
Technical field
The present invention relates to technical field of electronic products, is a kind of circuit that solves electronic product shutdown leakage current.
Background technology
Along with portable type electronic product (comprises the communication class product, digital series products etc.) a large amount of popularizing, basically all be to adopt lithium ion battery, Ni-MH battery etc. as power supply, owing to the reason of software design or the problem of hardware circuit (comprising hardware chip), even after " shutdown ", program that certain is a part of or circuit are still in work, do not accomplish shutdown truly, the leakage current of a residual part also, not only may produce some uncertain abnormal problems, also may cause the overdischarge of battery.
At present, because industry is to the clear and definite qualification of big or small neither one of portable type electronic product shutdown leakage current, also more rare on function realizes, perhaps there are the scheme of similar functions and circuit also all to be integrated in chip internal basically and realize the practicality underaction.So in the development process of electronic product,, need a kind of simple and practical circuit and solve for fear of the shutdown leakage problem that causes because of defective soft, hardware design.
Summary of the invention
The object of the present invention is to provide a kind of circuit that solves electronic product shutdown leakage current, thereby overcome portable type electronic product, under the situation of shutdown, reduce the shutdown leakage current of unknown cause because of defective soft, hardware design.
The present invention is achieved in that a kind of circuit that solves electronic product shutdown leakage current, comprising: first triode, second triode, first resistance, second resistance, the 3rd triode and diode; The drain electrode of described first triode connects anode, and as the input end of power supply, its source electrode links to each other with the source electrode of second triode; The drain electrode of described second triode is as the output terminal of battery supply; Two grids of first triode and second triode link to each other, and an end of first resistance links to each other with two source electrodes of described first, second triode, and the other end links to each other with two grids of first, second triode; The collector of described the 3rd triode links to each other with two grids of first, second triode, the base stage of the 3rd triode links to each other through first control signal of second resistance with described electronic product output, the grounded emitter of the 3rd triode, the positive pole of described diode links to each other with two grids of first, second triode, and its negative pole links to each other with second control signal in the described electronic product.
Wherein, described first control signal is the outside power supply holding signal of output of output port of CPU or PMIC in the described electronic product; Second control signal is the power button switch machine signal in the described electronic product.
Wherein, described first resistance is 100 kilohms, and described second resistance is 1 kilohm.
Wherein, described first triode and second triode are power P MOS triode.
Wherein, described the 3rd triode is common NPN double pole triode.
Example of the present invention compared with prior art, beneficial effect is: the present invention is by increasing a control circuit, is serially connected with between battery input and the affiliated electronic product, thereby solves the problem of the leakage current that shuts down.This circuit has and inserts low in energy consumptionly, and it is little to produce pressure drop, and is low-cost and can not influence the advantages such as performance of battery.
Description of drawings
Fig. 1 is the control model block scheme of the whole power on/off system of communication class product.
Fig. 2 is the control model block scheme of the whole power on/off system of digital series products.
Fig. 3 is the circuit theory diagrams that the present invention solves electronic product shutdown leakage current.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is described in detail further below in conjunction with accompanying drawing and example.Be convenient to understand, instantiation described herein only is used to explain the present invention, and is not used in qualification the present invention.
Among the present invention, power supply start control procedure: when power switch key is pressed, PMIC(or CPU) detect continuous low voltage signal after, inner LDO(LOW DROP-OUT) powering on provides power supply to interlock circuit, allow CPU begin executive routine, after program run, the power supply holding signal of a high level of the outside output of the output port of CPU is kept the existence of power supply, at this moment decontrol the power switch button, whole start flow process is finished.
Power supply shutdown control procedure: when power switch key is pressed, after CPU detects continuous low voltage signal, the power supply holding signal is become low-voltage, close the power supply of LDO, after power switch unclamps, finish whole shutdown process.
Be illustrated in figure 1 as the control model block scheme of the whole switching on and shutting down process of communication class electronic product, the switching on and shutting down process of communication class product: when power switch key is pressed, after the switch pin of PMIC detects continuous low voltage signal, opening inner LDO powers to interlock circuit, PMIC sends a reset signal to CPU simultaneously, allow CPU begin executive routine, after program run, CPU sends the holding signal of a high voltage (2.8V) to PMIC, keep power supply and the operation of PMIC, at this moment decontrol the power switch button, whole start flow process is finished; Shutdown process: when power switch key is pressed, after CPU detects continuous low voltage signal, executive routine makes the holding signal of delivering to PMIC become low-voltage, after the power supply of PMIC keeps pin to detect low voltage signal, close the power supply of LDO, after power switch unclamps, finish whole shutdown process.
Be illustrated in figure 2 as the control model block scheme of digital electronic product switching on and shutting down process, the switching on and shutting down process of digital series products: when power switch key is pressed, after the switch pin of CPU detects continuous low voltage signal, open inner LDO and power, allow CPU begin executive routine, after program is carried out to interlock circuit, the output port of CPU sends a high voltage holding signal to control circuit, make the gauge tap circuit turn-on, at this moment decontrol the power switch button, whole start flow process is finished; Shutdown process: when power switch key was pressed, after CPU detected continuous low voltage signal, executive routine became low level to the holding signal of delivering to control circuit, after power switch unclamps, on-off circuit disconnects, and closes the power supply of battery, finishes whole shutdown process.
Control circuit provided by the present invention is specifically consulted shown in Figure 3ly, comprising: triode T01, triode T02, resistance R 01, resistance R 02, triode T03 and diode D01; The drain electrode of triode T01 connects anode, and as power input, its source electrode is connected with the source electrode of triode T02; The drain electrode of triode T02 is as the output terminal of battery supply; Triode T01 links to each other with the grid of triode T02, and an end of resistance R 01 links to each other with two source electrodes of triode T01, T02, and the other end links to each other with two grids of triode T01, T02; The collector of triode T03 links to each other with two grids of triode T01, T02, the base stage of triode T03 links to each other through first control signal of resistance R 02 with described electronic product output, the grounded emitter of triode T03, the positive pole of diode D01 links to each other with two grids of triode T01, T02, and its negative pole links to each other with second control signal of described electronic product output.
Wherein, first control signal is the outside power supply holding signal of output of output port of CPU or PMIC in the described electronic product; Second control signal is the switching on and shutting down signal of power button in the described electronic product.
Principle of work:
T01, T02 are the PMOS triodes of two source electrodes butt joint, form the gauge tap of an anti-reverse leakage current, and the input of battery connects the drain electrode of T01, and the output of battery connects the drain electrode of T02, and the conducting of gauge tap or disconnection are by the collector voltage decision of T03.The collector of T03 is connected on the power switch by a general-purpose diode D01, and the base stage of T03 is connected on the pin of CPU holding signal by one 1 kilohm resistance R 02.
Under the situation that does not have start, the current collection that the input voltage of battery makes the T03 triode by diode parasitic in the PMOS pipe T01 is high voltage very, power switch signal and power supply holding signal are vacant state when shutdown, so T01, and two PMOS triodes of T02 end; When pressing start during key, power switch signal is dragged down, and makes the collector of T03 become low-voltage by diode D01, this moment T01, the T02 conducting, power supply is just delivered to PMIC by T01 and T02, finishes whole start process.After the start, CPU sends the holding signal of a high level, and this signal voltage makes triode T03 saturation conduction on the one hand, and after the T03 conducting, its collector becomes low-voltage, makes T01, and T02 continues conducting, and on the other hand, holding signal makes PMIC keep power supply; After power switch disconnected, the voltage on the power switch pin raise, and near cell voltage, D01 is ended.
Shutdown process: when power switch key is pressed, after CPU detects continuous low-voltage, executive routine makes the holding signal of delivering to PMIC become low-voltage, T03 is ended, simultaneously, after the power supply of PMIC keeps pin to detect continuous low voltage signal, close the power supply of LDO, after power switch unclamps, finish whole shutdown process; At this moment, because holding signal is low-voltage, T03 ends, and T02 is also ended, and has so just cut off the power supply that battery is input to PMIC.
In order to reduce the current loss of switch sections circuit itself, and make the easy saturation conduction of T03, R01 selects 100 kilohms resistance, the fan-out capability of holding signal is depended in the selection of resistance R 02, as long as it is just passable that the resistance value of selecting can make holding signal can make T03 enter the saturation conduction state when high level, resistance R 02 is selected 1 kilohm among the present invention, and T01, T02 adopt power P MOS triode.
The effect of triode T01 among Fig. 3: on the one hand, under the state of shutdown, allow the voltage of battery by the parasitic diode in the T01 T01, the grid potential of T02 is drawn high, and makes T01, T02 is in cut-off state; On the other hand, in the time of can preventing that described product utilization dispatch from foreign news agency from powering, cut off pouring in down a chimney of electric current, thereby avoid harmful effect the battery generation.
The above is preferred embodiment of the present invention only, is not limited to the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a circuit that solves electronic product shutdown leakage current is characterized in that, comprising: first triode, second triode, first resistance, second resistance, the 3rd triode and diode; The drain electrode of described first triode connects anode, and as power input, its source electrode links to each other with the source electrode of second triode; The drain electrode of described second triode is as the output terminal of battery supply; Two grids of first triode and second triode link to each other, and an end of first resistance links to each other with two source electrodes of described first, second triode, and the other end links to each other with two grids of first, second triode; The collector of described the 3rd triode links to each other with two grids of first, second triode, the base stage of the 3rd triode links to each other through first control signal of second resistance with described electronic product output, the grounded emitter of the 3rd triode, the positive pole of described diode links to each other with two grids of first, second triode, and its negative pole links to each other with second control signal of described electronic product output.
2. the circuit of solution electronic product shutdown leakage current as claimed in claim 1 is characterized in that, described first control signal is the power supply holding signal that the output port of described electronic product central processing unit or power management chip is outwards exported; The switching on and shutting down signal that described second control signal is a power button in the described electronic product.
3. the circuit of solution electronic product shutdown leakage current as claimed in claim 1 is characterized in that described first resistance is 100 kilohms, and described second resistance is 1 kilohm.
4. the circuit of solution electronic product shutdown leakage current as claimed in claim 1 is characterized in that described first triode and second triode are power P NMOS N-channel MOS N field effect transistor.
5. the circuit of solution electronic product shutdown leakage current as claimed in claim 1 is characterized in that described the 3rd triode is common NPN double pole triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010543403.2A CN102063170B (en) | 2010-11-15 | 2010-11-15 | A kind of circuit solving electronic product shutdown leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010543403.2A CN102063170B (en) | 2010-11-15 | 2010-11-15 | A kind of circuit solving electronic product shutdown leakage current |
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| Publication Number | Publication Date |
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| CN102063170A true CN102063170A (en) | 2011-05-18 |
| CN102063170B CN102063170B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010543403.2A Active CN102063170B (en) | 2010-11-15 | 2010-11-15 | A kind of circuit solving electronic product shutdown leakage current |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955094A (en) * | 2011-08-31 | 2013-03-06 | 环旭电子股份有限公司 | Leakage sensing circuit and mainboard with same |
| CN112688681A (en) * | 2020-12-25 | 2021-04-20 | 上海星融汽车科技有限公司 | Bus switching circuit based on MOS |
| CN114336531A (en) * | 2022-03-09 | 2022-04-12 | 荣耀终端有限公司 | Leakage protection circuit and electronic device |
| CN114487914A (en) * | 2022-04-13 | 2022-05-13 | 荣耀终端有限公司 | Electronic equipment and leakage current testing method |
Citations (4)
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| US20050180226A1 (en) * | 2004-02-13 | 2005-08-18 | Denso Corporation | Voltage output control apparatus and method |
| CN2779456Y (en) * | 2005-01-20 | 2006-05-10 | 英业达股份有限公司 | Electrical power control unit (EPCU) with reduced shutdown power consumption |
| CN1834850A (en) * | 2005-03-14 | 2006-09-20 | 佛山市顺德区顺达电脑厂有限公司 | Protection circuit |
| CN101576767A (en) * | 2008-07-01 | 2009-11-11 | 鸿富锦精密工业（深圳）有限公司 | Main board power supply circuit |
-
2010
- 2010-11-15 CN CN201010543403.2A patent/CN102063170B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050180226A1 (en) * | 2004-02-13 | 2005-08-18 | Denso Corporation | Voltage output control apparatus and method |
| CN2779456Y (en) * | 2005-01-20 | 2006-05-10 | 英业达股份有限公司 | Electrical power control unit (EPCU) with reduced shutdown power consumption |
| CN1834850A (en) * | 2005-03-14 | 2006-09-20 | 佛山市顺德区顺达电脑厂有限公司 | Protection circuit |
| CN101576767A (en) * | 2008-07-01 | 2009-11-11 | 鸿富锦精密工业（深圳）有限公司 | Main board power supply circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955094A (en) * | 2011-08-31 | 2013-03-06 | 环旭电子股份有限公司 | Leakage sensing circuit and mainboard with same |
| CN112688681A (en) * | 2020-12-25 | 2021-04-20 | 上海星融汽车科技有限公司 | Bus switching circuit based on MOS |
| CN114336531A (en) * | 2022-03-09 | 2022-04-12 | 荣耀终端有限公司 | Leakage protection circuit and electronic device |
| CN114487914A (en) * | 2022-04-13 | 2022-05-13 | 荣耀终端有限公司 | Electronic equipment and leakage current testing method |
| CN114487914B (en) * | 2022-04-13 | 2022-08-19 | 荣耀终端有限公司 | Electronic equipment and leakage current testing method |
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| Publication number | Publication date |
|---|---|
| CN102063170B (en) | 2016-01-20 |
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Address after: 518057, Guangdong, Nanshan District hi tech Industrial Park, south 6, No. 29, south 6, South, Shenzhen Applicant after: Nubian Technologies Ltd. Address before: 518057, Guangdong, Nanshan District hi tech Industrial Park, south 6, No. 29, south 6, South, Shenzhen Applicant before: Shenzhen ZTE Mobile Tech Co., Ltd. |
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Effective date of registration: 20201026 Address after: 215200 No. 1188 west two ring road, Shengze Town, Wujiang District, Suzhou, Jiangsu. Patentee after: Suzhou Shengze science and Technology Pioneer Park Development Co.,Ltd. Address before: 518057, Guangdong, Nanshan District hi tech Industrial Park, south 6, No. 29, south 6, South, Shenzhen Patentee before: NUBIA TECHNOLOGY Co.,Ltd. |
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