CN102761321A - Leakage suppression circuit - Google Patents
Leakage suppression circuit Download PDFInfo
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- CN102761321A CN102761321A CN2011101037781A CN201110103778A CN102761321A CN 102761321 A CN102761321 A CN 102761321A CN 2011101037781 A CN2011101037781 A CN 2011101037781A CN 201110103778 A CN201110103778 A CN 201110103778A CN 102761321 A CN102761321 A CN 102761321A
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- power supply
- electrically connected
- electronic switch
- electronic component
- electronic
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Abstract
The invention discloses a leakage suppression circuit comprising a voltage comparator and an electronic switch, wherein the forward input end and inverted input end of the voltage comparator are respectively and electrically connected to a conversional power supply and a standby power supply, the output end of the voltage comparator is electrically connected to the electronic switch so as to control the switching on or off of the electronic switch, and the electronic switch is electrically connected between a voltage isolating circuit and a second electronic element; and when a system is started up, the voltage comparator outputs a high level for switching on the electronic switch, and when the system is stopped, the voltage comparator outputs a low level for switching off the electronic switch so that the electric connection among the second electronic element, the voltage isolating circuit and the standby power supply is disconnected. The leakage suppression circuit can be used for preventing the standby power supply from outputting current to the second electronic element when the system is stopped, so that the electric energy waste can be effectively avoided.
Description
Technical field
The present invention relates to a kind of electric leakage and suppress circuit, relate in particular to a kind of electric leakage inhibition circuit that stand-by power supply is leaked electricity and suppresses.
Background technology
In electronic installations such as mobile phone, computer; Different electronic components often has different rated operational voltages; For example; The rated operational voltage of microprocessor is 3.3V, and the rated operational voltage of some electronic component that electrically connects with little processing is 5V, and this just makes the logic digital high of microprocessor and these electronic components have the different voltages with different value.In actual use, microprocessor is burnt out, often need carry out the isolation of different voltages at making alive buffer circuit between microprocessor and these electronic components in order to prevent excessive voltage.
See also Fig. 1, be depicted as an existing voltage isolation circuit.This voltage isolation circuit is a metal oxide layer semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) Q11.The source S of this MOSFET Q11 is electrically connected to microprocessor 13; Drain D is electrically connected to electronic component 15; Grid G is electrically connected to a 3.3V power supply through one first resistance R 11.Said 3.3V power supply also is electrically connected between the source S of said microprocessor 13 and this MOSFET Q11 through one first resistance R 11.One 5V power supply is electrically connected between the drain electrode of said electronic component 15 and MOSFET Q11 through one the 3rd resistance R 15.
When carrying out the transmission of digital signal between said microprocessor 13 and the electronic component 15; If microprocessor 13 output bits 1 (high level); This moment, the source voltage of this MOSFET Q11 equated with grid voltage; MOSFET Q11 ends, and what electronic component received is the conventional supply voltage of 5V, is high level (bit 1); When microprocessor 13 output bits 0 (low level), MOSFET Q11 conducting, the voltage of input electronic element is low level (bit 0).When said electronic component sends bit 1 (high level); The magnitude of voltage of its output is 5V; This moment, MOSFET Q11 ended, and the 3.3V power supply output 3.3V voltage that is connected with second resistance R 13 is to microprocessor 13, and 13 of microprocessors receive high level (bit 1); When said electronic component sends bit 0 (low level), MOSFET Q11 conducting, the voltage that microprocessor 13 receives is low level (bit 0).So, can realize that through said voltage isolation circuit said electronic component sends the high level of 5V, and said microprocessor receives the high level of 3.3V.
In actual use, wake (wake on) function up for microprocessor is had, said 3.3V power supply is generally the 3.3V stand-by power supply, that is to say, when electronic apparatus system shut down, this 3.3V stand-by power supply still existed; And the 5V power supply then is 0V when system closedown owing to be conventional power supply.At this moment, MOSFET Q11 then can conducting, and the 3.3V stand-by power supply then can output current to said electronic component 15 through this MOSFET Q11, not only can cause the waste of power supply, also can cause the instability of system.
Summary of the invention
To the problems referred to above, be necessary to provide a kind of when system closedown, can suppress circuit to the electric leakage that stand-by power supply output suppresses.
A kind of electric leakage suppresses circuit; Be applied to comprise in the electronic installation of first electronic component, second electronic component, stand-by power supply, conventional power supply and voltage isolation circuit; Said first electronic component is electrically connected to said second electronic component through voltage isolation circuit; Said stand-by power supply is electrically connected between said first electronic component and the voltage isolation circuit; Said electric leakage suppresses circuit and comprises voltage comparator and electronic switch; The normal phase input end of voltage comparator and inverting input are electrically connected to said conventional power supply and stand-by power supply respectively, and the output of this voltage comparator is electrically connected to closure and the disconnection of said electronic switch to control this electronic switch, and this electronic switch is electrically connected between said voltage isolation circuit and said second electronic component; When system boot; Said voltage comparator output high level makes electronic switch closes; When system closedown, said voltage comparator output low level is broken off to break off the electric connection between said second electronic component and said voltage isolation circuit and the stand-by power supply electronic switch.
Described electric leakage suppresses circuit and judges through said voltage comparator is set whether electronic installation shuts down; And when said electronic installation shuts down; Break off the electric connection between said second electronic component and the stand-by power supply through said electronic switch; Can prevent effectively that thus stand-by power supply from still having electric current to flow to said second electronic component when system closedown, practice thrift electric energy and prevented that effectively the unstable situation of electronic apparatus system from taking place.
Description of drawings
Fig. 1 is the circuit diagram of an existing voltage isolation circuit.
Fig. 2 has the functional block diagram that preferred embodiments electric leakage of the present invention suppresses the electronic installation of circuit.
Fig. 3 is the circuit diagram of electronic installation shown in Figure 2.
The main element symbol description
| |
100 |
| |
13 |
| |
15 |
| Electric |
20 |
| |
21 |
| |
23 |
| First |
30 |
| Second |
40 |
| Stand-by |
50 |
| |
60 |
| |
70 |
| MOSFET | Q11、Q71 |
| First resistance | R11 |
| Second resistance | R13 |
| The 3rd resistance | R15 |
| First pull-up resistor | R71 |
| Second pull-up resistor | R73 |
| The 3rd pull-up resistor | R75 |
| NPN type triode | Q21 |
| Diode | D21 |
| Current-limiting resistance | R21 |
Following embodiment will combine above-mentioned accompanying drawing to further specify the present invention.
Embodiment
See also Fig. 2, the electric leakage of preferred embodiments of the present invention suppresses in the electronic installation 100 that circuit 20 is applied to comprise first electronic component 30, second electronic component 40, stand-by power supply 50, conventional power supply 60 and voltage isolation circuit 70.Said first electronic component 30 is electrically connected to said second electronic component 40 through said voltage isolation circuit 70; Said stand-by power supply 50 is electrically connected between said first electronic component 30 and the voltage isolation circuit 70, and said conventional power supply 60 is electrically connected between said second electronic component 40 and the voltage isolation circuit 70.Said voltage isolation circuit 70 is used for carrying out digital signal when transmitting at this first electronic component 30 and second electronic component 40, isolates different voltages with different, thereby makes said first electronic component 30 and second electronic component 40 obtain its specified magnitude of voltage respectively.
See also Fig. 3, in this preferred embodiments, said voltage isolation circuit 70 is a MOSFET Q71.The source S of this MOSFET Q71 is electrically connected to first electronic component 30; Drain D is electrically connected to second electronic component 40; Grid G is electrically connected to said stand-by power supply 50 through one first pull-up resistor R71.Said stand-by power supply 50 also is electrically connected between the source S of said first electronic component 30 and this MOSFET Q71 through one second pull-up resistor R73.Said conventional power supply 60 is electrically connected between the drain D of said second electronic component 40 and said MOSFET Q71 through one the 3rd pull-up resistor R75.The magnitude of voltage of said conventional power supply 60 is greater than the magnitude of voltage of said stand-by power supply 50.In this preferred embodiments, said conventional power supply 60 can be the 5V power supply; Said stand-by power supply 50 is the 3.3V power supply.Be appreciated that conventional power supply 60 can also be the 12V power supply when stand-by power supply 50 is the 3.3V power supply; And when stand-by power supply 50 was the 5V power supply, 60 of conventional power supplys were the 12V power supply.
Said electric leakage suppresses circuit 20 and comprises voltage comparator 21 and electronic switch 23.The normal phase input end of said voltage comparator 21 and inverting input are electrically connected to said conventional power supply 60 and stand-by power supply 50 respectively, and the output of this voltage comparator 21 is electrically connected to closure and the disconnection of said electronic switch 23 with control electronic switch 23.The power supply of said voltage comparator 21 is provided by said stand-by power supply 50.Said electronic switch 23 also is electrically connected between said second electronic component 40 and the voltage isolation circuit 70.In this preferred embodiments, said electronic switch 23 is NPN type triode Q21 (as shown in Figure 3).The base stage of this NPN type triode Q21 is electrically connected to the output of said voltage comparator 21; Collector electrode is electrically connected to the drain electrode of said MOSFET Q71; Emitter is electrically connected to said second electronic component 40.Be appreciated that said electronic switch 23 also can be N-channel MOS FET, its grid, source electrode and drain electrode be base stage, the emitter and collector of corresponding said NPN type triode Q21 respectively.
Said electric leakage suppresses circuit 20 and also comprises diode D21 and current-limiting resistance R21.The normal phase input end of said diode D21 and inverting input are electrically connected to the output and the current-limiting resistance R21 of said voltage comparator 21 respectively.The other end of this current-limiting resistance R21 is electrically connected to the base stage of said NPN type triode Q21.Because the conducting voltage of said NPN type triode Q21 is generally about 0.7V, and its voltage difference also is 0.7V after the diode D21 conducting, therefore said diode D21 can prevent the interference of noise to this NPN type triode Q21.
Said electric leakage suppresses circuit 20 in use; Said electronic installation 100 is when start; Stand-by power supply 50 and conventional power supply 60 all have voltage output; This moment, voltage comparator 21 output high level were to said diode D21; Diode D21 forward conduction makes NPN type triode Q21 conducting, and second electronic component 40 promptly is electrically connected to the said voltage isolation circuit 70 and first electronic component 30 through this NPN type triode Q21, thereby this first electronic component 30 and second electronic component 40 can carry out the transmission of digital signal through this voltage isolation circuit 70.And when said electronic installation 100 shuts down; Stand-by power supply 50 has voltage output, and the output of conventional power supply 60 no-voltages, voltage comparator 21 output low levels at this moment; Diode D21 and NPN type triode Q21 all end; Even said MOSFET Q71 conducting this moment, because this NPN type triode Q21 ends, stand-by power supply 50 can not output current to said second electronic component 40 yet.
Described electric leakage suppresses circuit 20 and judges through said voltage comparator 21 is set whether electronic installation 100 shuts down; And when said electronic installation 100 shuts down; Break off the electric connection between said second electronic component 40 and the stand-by power supply 50 through said electronic switch 23; Can prevent effectively that thus stand-by power supply 50 from still having electric current to flow to said second electronic component 40 when system closedown, practice thrift electric energy and prevented that effectively the unstable situation of electronic installation 100 systems from taking place.
Claims (5)
1. an electric leakage suppresses circuit; Be applied to comprise in the electronic installation of first electronic component, second electronic component, stand-by power supply, conventional power supply and voltage isolation circuit; Said first electronic component is electrically connected to said second electronic component through voltage isolation circuit; Said stand-by power supply is electrically connected between said first electronic component and the voltage isolation circuit; It is characterized in that: said electric leakage suppresses circuit and comprises voltage comparator and electronic switch; The normal phase input end of voltage comparator and inverting input are electrically connected to said conventional power supply and stand-by power supply respectively, and the output of this voltage comparator is electrically connected to closure and the disconnection of said electronic switch to control this electronic switch, and this electronic switch is electrically connected between said voltage isolation circuit and said second electronic component; When system boot; Said voltage comparator output high level makes electronic switch closes; When system closedown, said voltage comparator output low level is broken off to break off the electric connection between said second electronic component and said voltage isolation circuit and the stand-by power supply electronic switch.
2. electric leakage as claimed in claim 1 suppresses circuit, and it is characterized in that: said electronic switch is triode or metal oxide layer semiconductor field-effect transistor.
3. according to claim 1 or claim 2 electric leakage suppresses circuit; It is characterized in that: said electric leakage suppresses circuit and also comprises diode; The normal phase input end of said diode and inverting input are electrically connected to the output and the electronic switch of said voltage comparator respectively, and said diode is used to prevent the interference of noise to this electronic switch.
4. electric leakage as claimed in claim 3 suppresses circuit, it is characterized in that: said electric leakage suppresses circuit and also comprises current-limiting resistance, and said current-limiting resistance is electrically connected between said diode and the electronic switch.
5. according to claim 1 or claim 2 electric leakage suppresses circuit, and it is characterized in that: said voltage comparator is supplied power by said stand-by power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101037781A CN102761321A (en) | 2011-04-25 | 2011-04-25 | Leakage suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101037781A CN102761321A (en) | 2011-04-25 | 2011-04-25 | Leakage suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102761321A true CN102761321A (en) | 2012-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101037781A Pending CN102761321A (en) | 2011-04-25 | 2011-04-25 | Leakage suppression circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102761321A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018588A (en) * | 2012-11-23 | 2013-04-03 | 无锡中星微电子有限公司 | Low-power-consumption anti-interference three-state input detection circuit |
| CN106292967A (en) * | 2015-05-28 | 2017-01-04 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment and mainboard thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4704542A (en) * | 1985-03-22 | 1987-11-03 | Rca Corporation | Standby power supply |
| CN2186461Y (en) * | 1993-12-13 | 1994-12-28 | 北京天石科技发展公司 | Anti-explosive multipurpose protection device for coal electric drill |
| CN1941542A (en) * | 2005-09-30 | 2007-04-04 | 鸿富锦精密工业（深圳）有限公司 | Power-supplying circuit |
-
2011
- 2011-04-25 CN CN2011101037781A patent/CN102761321A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4704542A (en) * | 1985-03-22 | 1987-11-03 | Rca Corporation | Standby power supply |
| CN2186461Y (en) * | 1993-12-13 | 1994-12-28 | 北京天石科技发展公司 | Anti-explosive multipurpose protection device for coal electric drill |
| CN1941542A (en) * | 2005-09-30 | 2007-04-04 | 鸿富锦精密工业（深圳）有限公司 | Power-supplying circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018588A (en) * | 2012-11-23 | 2013-04-03 | 无锡中星微电子有限公司 | Low-power-consumption anti-interference three-state input detection circuit |
| CN103018588B (en) * | 2012-11-23 | 2015-03-18 | 无锡中星微电子有限公司 | Low-power-consumption anti-interference three-state input detection circuit |
| CN106292967A (en) * | 2015-05-28 | 2017-01-04 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment and mainboard thereof |
| CN106292967B (en) * | 2015-05-28 | 2019-07-05 | 鸿富锦精密工业(武汉)有限公司 | Electronic equipment and its mainboard |
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| PB01 | Publication | ||
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Application publication date: 20121031 |