CN104750222A - Power circuit - Google Patents
Power circuit Download PDFInfo
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- CN104750222A CN104750222A CN201310743999.4A CN201310743999A CN104750222A CN 104750222 A CN104750222 A CN 104750222A CN 201310743999 A CN201310743999 A CN 201310743999A CN 104750222 A CN104750222 A CN 104750222A
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- electronic switch
- resistance
- voltage
- power circuit
- diode
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Abstract
Disclosed is a power circuit. The power circuit comprises first and second power sources and first to fourth electronic switches. When output voltage of an output end of the first power source is smaller than a preset value, the second electronic switch is switched on and the third electronic switch and the fourth electronic switch are controlled to be switched on, and an output end of the second power source is connected with a second voltage end sequentially through a first resistor and a first diode so as to provide power. When output voltage of the first power source is insufficient, the power circuit is automatically switched to the second power source to provide power.
Description
Technical field
The present invention relates to a kind of power circuit.
Background technology
Usual computer motherboard is after disconnection AC power, and standby power supply a such as battery that can start on mainboard is that segment chip is powered, if the computing machine long period does not connect AC power, this cell output voltage will drop to lower value and cause powering down chips and obliterated data.
Summary of the invention
Given this, be necessary that providing a kind of provides redundant power and the power circuit of energy auto switching electric source.
A kind of power circuit, comprising:
First and second power supply;
First to fourth electronic switch, the first end of described first electronic switch is connected to the output terminal of the first power supply, the first end of described first electronic switch is also connected to the first voltage end, second end of described first electronic switch is connected to the second voltage end by the first resistance, the three-terminal link of described first electronic switch is in the second end of the second electronic switch, 3rd end of described first electronic switch is also by the first capacity earth, second end of the second electronic switch is by the second resistance eutral grounding, the first end of described second electronic switch is connected to the second voltage end by the 3rd resistance, 3rd end of described second electronic switch is connected to the first voltage end by the 4th resistance, 3rd end of described second electronic switch is also by the 5th resistance eutral grounding, second end of described second electronic switch is also connected to the 3rd end of the 3rd electronic switch, the first end ground connection of described 3rd electronic switch, second end of described 3rd electronic switch is connected to the second voltage end by the 6th resistance, second end of described 3rd electronic switch is also connected to the 3rd end of the 4th electronic switch, the first end of described 4th electronic switch is connected to the output terminal of second source, second end of described 4th electronic switch is connected to the second end of the first electronic switch,
Described first electronic switch, when second electronic switch and the 4th electronic switch the 3rd end are high level, the second end and first end disconnect, described first electronic switch, when second electronic switch is low level with the 4th electronic switch the 3rd end, the second end is connected with first end, when 3rd end of described 3rd electronic switch is high level, first end is connected with the second end, when 3rd end of described 3rd electronic switch is low level, first end and the second end disconnect, when the first power output end output voltage is lower than a preset value, node between 4th resistance and the 5th resistance is low level, the first end of the second electronic switch is connected with the second end, second end of the second electronic switch is high level and starts as described first capacitance cathode charging, described first capacitance cathode be high level before the first end of the first electronic switch keep being connected with the second end, the first end of described 3rd electronic switch is connected with the second end, 3rd end ground connection of described 4th electronic switch, the first end of described 4th electronic switch is connected with the second end, the output terminal of described second source is connected to the second voltage end through the first resistance.
When the output voltage of the first power supply is not enough, described power circuit will automatically switch to second source and power.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the better embodiment of power circuit of the present invention.
Main element symbol description
| Power circuit | 10 |
| First power supply | 11 |
| Second source | 12 |
| Resistance | R1-R7 |
| Electric capacity | C1-C4 |
| Electronic switch | Q1-Q4 |
| Diode | D1-D2 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Please refer to Fig. 1, the better embodiment of power circuit 10 of the present invention comprises the first power supply 11, second source 12, resistance R1-R7, electric capacity C1-C4 and electronic switch Q1-Q4.
The first end of described electronic switch Q1 is connected to the output terminal VOUT of the first power supply 11, the first end of described electronic switch Q1 is also connected to the first voltage end V1, described first power supply 11 is by output terminal VOUT output voltage to the first voltage end V1, second end of described electronic switch Q1 is connected to the anode of diode D1 by resistance R1, the negative electrode of diode D1 is connected to the second voltage end V2, the negative electrode of described diode D1 is connected to the negative electrode of diode D2, the anode of described diode D2 is connected to tertiary voltage end V3 by resistance R2, described second voltage end V2 is by electric capacity C2 ground connection.The three-terminal link of described electronic switch Q1 is in second end of electronic switch Q2, 3rd end of described electronic switch Q1 is also by electric capacity C1 ground connection, second end of electronic switch Q2 is by resistance R3 ground connection, the first end of described electronic switch Q2 is connected to the second voltage end V2 by resistance R4, 3rd end of described electronic switch Q2 is connected to the first voltage end V1 by resistance R5, 3rd end of described electronic switch Q2 is also by resistance R6 ground connection, electric capacity C3 is in parallel with resistance R6, second end of described electronic switch Q2 is also connected to the 3rd end of electronic switch Q3, 3rd end of described electronic switch Q3 is by electric capacity C4 ground connection, the first end ground connection of described electronic switch Q3, second end of described electronic switch Q3 is connected to the second voltage end V2 by resistance R7, second end of described electronic switch Q3 is also connected to the 3rd end of electronic switch Q4, the first end of described electronic switch Q4 is connected to the output terminal VOUT of second source 12, second end of described electronic switch Q4 is connected to second end of electronic switch Q1.When 3rd end of described electronic switch Q1, electronic switch Q2 and electronic switch Q4 is high level, the second end and first end disconnect, when described electronic switch Q1, electronic switch Q2 are low level with the 3rd end of electronic switch Q4, the second end is connected with first end, when 3rd end of described electronic switch Q3 is high level, first end is connected with the second end, and when the 3rd end of described electronic switch Q3 is low level, first end and the second end disconnect.The grounding pin GND of described first power supply 11, the equal ground connection of earthing of casing pin GND1 and GND2.The grounding pin GND of described second source 12, the equal ground connection of earthing of casing pin GND1 and GND2.
In present embodiment, described electronic switch Q1, electronic switch Q2 and electronic switch Q4 are PNP type triode, and first end, the second end and the 3rd end be the emitter of corresponding triode, collector and base stage respectively.Described electronic switch Q3 is N channel field-effect pipe, the source electrode of the corresponding field effect transistor of first end, the drain electrode of the corresponding field effect transistor of the second end, the grid of the corresponding field effect transistor of the 3rd end.Described first power supply 11 and second source 12 are battery.
When the output voltage of the output terminal VOUT of the first power supply 11 is more than or equal to a preset value, node between resistance R5 and resistance R6 is high level, after the 3rd termination receipts high level signal of electronic switch Q2, its first end and the second end disconnect, 3rd end of electronic switch Q1 is low level by resistance R3 ground connection, the first end of electronic switch Q1 is connected with the second end, first end and second end of electronic switch Q3 disconnect, 3rd end of electronic switch Q4 is high level, first end and second end of electronic switch Q4 disconnect, described first power supply 11 normal power supply gives the second voltage end V2.
When the output voltage of the output terminal VOUT of the first power supply 11 is lower than a preset value, node between resistance R5 and resistance R6 is low level, after the 3rd termination receipts low level signal of electronic switch Q2, its first end is connected with the second end, second end of electronic switch Q2 is high level and starts as described electric capacity C1 charges, described electric capacity C1 be high level before the first end of electronic switch Q1 keep being connected with the second end, after the 3rd termination receipts high level signal of described electronic switch Q3, first end is connected with the second end, the 3rd end ground connection of described electronic switch Q4, the first end of described electronic switch Q4 is connected with the second end, the output terminal VOUT of described second source 12 is connected to the second voltage end V2 through resistance R1 and diode D1 successively, with this by described second source 12 for being connected to the power electronic equipment of described second voltage end V2.
Tertiary voltage end V3 connects externally fed equipment, when the voltage of the first power supply 11 and second source 12 all cannot be powered to the second voltage end V2 during normal power supply to the second voltage end V2.
When the output voltage of the first power supply 11 is not enough, described power circuit 10 will automatically switch to second source 12 and power.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not depart from the spirit and scope of technical solution of the present invention.
Claims (5)
1. a power circuit, comprising:
First and second power supply;
First to fourth electronic switch, the first end of described first electronic switch is connected to the output terminal of the first power supply, the first end of described first electronic switch is also connected to the first voltage end, second end of described first electronic switch is connected to the second voltage end by the first resistance, the three-terminal link of described first electronic switch is in the second end of the second electronic switch, 3rd end of described first electronic switch is also by the first capacity earth, second end of the second electronic switch is by the second resistance eutral grounding, the first end of described second electronic switch is connected to the second voltage end by the 3rd resistance, 3rd end of described second electronic switch is connected to the first voltage end by the 4th resistance, 3rd end of described second electronic switch is also by the 5th resistance eutral grounding, second end of described second electronic switch is also connected to the 3rd end of the 3rd electronic switch, the first end ground connection of described 3rd electronic switch, second end of described 3rd electronic switch is connected to the second voltage end by the 6th resistance, second end of described 3rd electronic switch is also connected to the 3rd end of the 4th electronic switch, the first end of described 4th electronic switch is connected to the output terminal of second source, second end of described 4th electronic switch is connected to the second end of the first electronic switch,
Described first electronic switch, when second electronic switch and the 4th electronic switch the 3rd end are high level, the second end and first end disconnect, described first electronic switch, when second electronic switch is low level with the 4th electronic switch the 3rd end, the second end is connected with first end, when 3rd end of described 3rd electronic switch is high level, first end is connected with the second end, when 3rd end of described 3rd electronic switch is low level, first end and the second end disconnect, when the first power output end output voltage is lower than a preset value, node between 4th resistance and the 5th resistance is low level, the first end of the second electronic switch is connected with the second end, second end of the second electronic switch is high level and starts as described first capacitance cathode charging, described first capacitance cathode be high level before the first end of the first electronic switch keep being connected with the second end, the first end of described 3rd electronic switch is connected with the second end, 3rd end ground connection of described 4th electronic switch, the first end of described 4th electronic switch is connected with the second end, the output terminal of described second source is connected to the second voltage end through the first resistance.
2. power circuit as claimed in claim 1, is characterized in that: described second voltage end is by the second capacity earth, and the 3rd end of described second electronic switch is by the 3rd capacity earth, and the 3rd end of described 3rd electronic switch is by the 4th capacity earth.
3. power circuit as claimed in claim 1, it is characterized in that: described first electronic switch, the second electronic switch and the 4th electronic switch are PNP type triode, first end, the second end and the 3rd end be the emitter of corresponding triode, collector and base stage respectively; Described 3rd electronic switch is N channel field-effect pipe, the source electrode of the corresponding field effect transistor of first end, the drain electrode of the corresponding effect pipe of the second end, the grid of the corresponding field effect transistor of the 3rd end.
4. power circuit as claimed in claim 1, it is characterized in that: described first resistance is connected to the anode of the first diode, the negative electrode of described first diode is connected to described second voltage end.
5. power circuit as claimed in claim 1, is characterized in that: the negative electrode of described first diode is connected to the negative electrode of the second diode, and the anode of described second diode is connected to tertiary voltage input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743999.4A CN104750222A (en) | 2013-12-31 | 2013-12-31 | Power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310743999.4A CN104750222A (en) | 2013-12-31 | 2013-12-31 | Power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104750222A true CN104750222A (en) | 2015-07-01 |
Family
ID=53590054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310743999.4A Pending CN104750222A (en) | 2013-12-31 | 2013-12-31 | Power circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104750222A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491115A (en) * | 2020-11-25 | 2021-03-12 | 四川长虹电器股份有限公司 | Power supply management circuit for standby rechargeable battery |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2338794Y (en) * | 1997-01-13 | 1999-09-15 | 梅捷企业股份有限公司 | Arrangement for automatically distinguishing and switching voltage of power supply of CPU single power/double power supply CPU |
| US20040135569A1 (en) * | 2002-11-15 | 2004-07-15 | Yun Yeo Sung | Power controlling system |
| CN101728866A (en) * | 2008-10-21 | 2010-06-09 | 中兴通讯股份有限公司 | Device and method for realizing switching of power supply |
-
2013
- 2013-12-31 CN CN201310743999.4A patent/CN104750222A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2338794Y (en) * | 1997-01-13 | 1999-09-15 | 梅捷企业股份有限公司 | Arrangement for automatically distinguishing and switching voltage of power supply of CPU single power/double power supply CPU |
| US20040135569A1 (en) * | 2002-11-15 | 2004-07-15 | Yun Yeo Sung | Power controlling system |
| CN101728866A (en) * | 2008-10-21 | 2010-06-09 | 中兴通讯股份有限公司 | Device and method for realizing switching of power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491115A (en) * | 2020-11-25 | 2021-03-12 | 四川长虹电器股份有限公司 | Power supply management circuit for standby rechargeable battery |
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Application publication date: 20150701 |