CN104182023A - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN104182023A CN104182023A CN201310195487.9A CN201310195487A CN104182023A CN 104182023 A CN104182023 A CN 104182023A CN 201310195487 A CN201310195487 A CN 201310195487A CN 104182023 A CN104182023 A CN 104182023A
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- electronic switch
- heat exchange
- pin
- resistance
- exchange controller
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Abstract
The invention provides a power supply circuit, which comprises a heat exchange controller, a first electronic switch, a second electronic switch, a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor, wherein the heat exchange controller is connected between a power supply and the first and second electronic switches, the first electronic switch is connected with the diode through the second electronic switch, and the diode is also grounded through the first capacitor. The power supply circuit can realize the power supply to a main board during the main board power failure so that the system data can be stored.
Description
Technical field
The present invention relates to a kind of power circuit.
Background technology
Existing mainboard generally all has the function of self-power-off protection, in self information such as electric current and voltage, occurs when abnormal, and the significant data of mainboard in can automatic storage system deenergization are to prevent loss of data and protection mainboard.But when civil power power-off, mainboard is supplied with and then cannot work because of non-transformer, and the data of mainboard do not have the words of storage to lose, thereby cause unnecessary loss.
Summary of the invention
In view of above content, be necessary to provide a kind of power circuit, to power to mainboard with memory system data when the mainboard power-off.
A kind of power circuit, be connected in the output terminal of the power supply unit of mainboard, described power circuit comprises a heat exchange controller, first and second electronic switch, one diode, first to fourth resistance, and one first electric capacity, the monitoring pin of described heat exchange controller is connected with the output terminal of described power supply unit by described the first resistance, described monitoring pin is also by one second resistance eutral grounding, the power pins of described heat exchange controller is connected with the output terminal of described power supply unit, the first induction pin of described heat exchange controller connects the output terminal of described power supply unit and through described the 3rd resistance, connects the second induction pin of described heat exchange controller, the second induction pin of described heat exchange controller connects the first end of described the first electronic switch, the control pin of described heat exchange controller is connected in the control end of described first and second electronic switch, the second end of described the first electronic switch is connected with the second end of described the second electronic switch, the first end of described the second electronic switch is successively through described the 4th resistance and described the first capacity earth, the first end of described the second electronic switch is also connected in the negative electrode of described diode, the node of the anodic bonding of described diode between described the 4th resistance and described the first electric capacity, when the voltage of monitoring when described monitoring pin is not less than the predeterminated voltage of described monitoring pin and the electric current that passes through described the 3rd resistance that described first and second induction pin is detected and is not less than the predetermined current of described heat exchange controller, described control pin output high level signal, when the voltage of monitoring when described monitoring pin is less than the predeterminated voltage of described monitoring pin or the electric current that passes through described the 3rd resistance that described first and second induction pin is detected and is less than the predetermined current of described heat exchange controller, described control pin output low level signal, when the control end of described the first electronic switch receives high level signal, the first end of described the first electronic switch and the second end conducting, when the control end of described the first electronic switch receives low level signal, the first end of described the first electronic switch and the second end disconnect, when the control end of described the second electronic switch receives high level signal, the first end of described the second electronic switch and the second end conducting, when the control end of described the second electronic switch receives low level signal, the first end of described the second electronic switch and the second end disconnect.
Above-mentioned power circuit can be realized when described mainboard power-off, utilizes described the first capacitor discharge to provide power supply to described mainboard, so that mainboard carries out data storage work, avoids loss of data.
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 supply unit | 1 |
| Civil power | 2 |
| Power circuit | 100 |
| CPLD | 8 |
| Resistance | R1-R5 |
| Diode | D1 |
| Field effect transistor | Q1、Q2、Q3 |
| Heat exchange controller | U1 |
| Electric capacity | C1、C2 |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Below in conjunction with accompanying drawing and better embodiment, the present invention is described in further detail:
Please refer to Fig. 1, power circuit 100 of the present invention is arranged on a mainboard, be connected in the output terminal of the power supply unit 1 of described mainboard, described power supply unit 1 is connected with civil power 2, and described power supply unit 1 is for being converted to civil power 2 in direct current and then giving described main board power supply.The better embodiment of power circuit 100 of the present invention comprises a heat exchange controller U1, a diode D1, three field effect transistor Q1, Q2, Q3, a CPLD (Complex Programmable Logic Device, CPLD) 8, two capacitor C 1, C2 and five resistance R 1-R5.In present embodiment, described field effect transistor Q1, Q2 and Q3 are N-type field effect transistor.
The monitoring pin UV of described heat exchange controller U1 is connected with the output terminal of described power supply unit 1 by described resistance R 3, and described monitoring pin UV is also by described resistance R 4 ground connection.The power pins VDD of described heat exchange controller U1 is connected with the output terminal of described power supply unit 1.The induction pin SENSE+ of described heat exchange controller U1 and the output terminal of described power supply unit 1 are connected and through described resistance R 5, are connected the induction pin SENSE-of described heat exchange controller U1, and the induction pin SENSE-of described heat exchange controller U1 connects the drain electrode of described field effect transistor Q2.The control pin GATE of described heat exchange controller U1 is connected in the grid of described field effect transistor Q2, Q3.
The source electrode of described field effect transistor Q2 is connected with the source electrode of described field effect transistor Q3, and the drain electrode of described field effect transistor Q3 is connected in the negative electrode of described diode D1, and the anode of described diode D1 is by described capacitor C 2 ground connection.The drain electrode of described field effect transistor Q3 is also successively by described resistance R 2 and described capacitor C 1 ground connection, and the node between described resistance R 2 and described capacitor C 1 is connected in the anode of described diode D1.
The drain electrode of described field effect transistor Q3 is also connected in the drain electrode of described field effect transistor Q1, the source ground of described field effect transistor Q1 by described resistance R 1.The grid of described field effect transistor Q1 is connected with described CPLD 8.
The monitoring pin UV of described heat exchange controller U1 is for monitoring the voltage of described power supply unit 1 output, when the voltage of the described power supply unit 1 output voltage after resistance R 3, R4 dividing potential drop is not less than the predeterminated voltage of described monitoring pin UV, the control pin GATE output high level signal of described heat exchange controller U1.When the voltage of the described power supply unit 1 output voltage after resistance R 3, R4 dividing potential drop is less than the predeterminated voltage of described monitoring pin UV, the control pin GATE output low level signal of described heat exchange controller U1.
The induction pin SENSE+ of described heat exchange controller U1 and SENSE-are used for detecting the voltage difference at described resistance R 5 two ends, and then obtain by the current value of resistance R 5, and described heat exchange controller U1 compares according to resulting current value and predetermined current value.When described current value is not more than the predetermined current value of described heat exchange controller U1, the control pin GATE output high level signal of described heat exchange controller U1, when described current value is greater than the predetermined current value of described heat exchange controller U1, the control pin GATE output low level signal of described heat exchange controller U1.
When civil power 2 is normal and mainboard is normally worked, be that the voltage that the monitoring pin UV of described heat exchange controller U1 monitors is not less than predeterminated voltage, when the induction pin SENSE+ of described heat exchange controller U1 and the current value that SENSE-detects are not more than predetermined current value, the control pin GATE output high level signal of described heat exchange controller U1, i.e. the equal conducting of described field effect transistor Q2, Q3.Described power supply unit 1 offers described mainboard by described field effect transistor Q2, Q3 after the alternating current receiving is converted to DC voltage, so that mainboard is normally worked, described power supply unit 1 charges to described capacitor C 1, C2 by described field effect transistor Q2, Q3 and described resistance R 2 simultaneously.Now described field effect transistor Q1 receives the low level signal from CPLD 8, and described field effect transistor Q1 is in cut-off state.
When civil power 2 power-off, the voltage that the monitoring pin UV of described heat exchange controller U1 monitors is lower than predeterminated voltage, the control pin GATE output low level signal of described heat exchange controller U1, and described field effect transistor Q2, Q3 all end.Described capacitor C 1, C2 start electric discharge by diode D1, provide voltage to carry out data storage to described mainboard.
When described mainboard completes after data storage, described CPLD 8 output one high level signals are to the grid of described field effect transistor Q1, described field effect transistor Q1 conducting, described capacitor C 1 and C2 accelerate electric discharge by resistance R 1 and field effect transistor Q1, to guarantee described in mainboard is when restarting start that capacitor C 1 and C2 have been discharged.
From description above, can find out, described capacitor C 1, C2 for powering to mainboard so that mainboard carries out data storage when civil power 2 power-off, the capacitance of described capacitor C 1, C2 can be set according to the energy demand of data storage work, in other embodiments, can also increase the quantity of electric capacity, the electric capacity of increase and described capacitor C 1, C2 are in parallel.In addition, described field effect transistor Q1, Q2, Q3 all play the effect of electronic switch, in other embodiments, described field effect transistor Q1, Q2, Q3 also can replace with other electronic switches, wherein, control end, first end and second end of the grid of field effect transistor, drain electrode and the corresponding electronic switch of source electrode difference.
Claims (4)
1. a power circuit, be connected in the output terminal of the power supply unit of mainboard, described power circuit comprises a heat exchange controller, first and second electronic switch, one diode, first to fourth resistance, and one first electric capacity, the monitoring pin of described heat exchange controller is connected with the output terminal of described power supply unit by described the first resistance, described monitoring pin is also by one second resistance eutral grounding, the power pins of described heat exchange controller is connected with the output terminal of described power supply unit, the first induction pin of described heat exchange controller connects the output terminal of described power supply unit and through described the 3rd resistance, connects the second induction pin of described heat exchange controller, the second induction pin of described heat exchange controller connects the first end of described the first electronic switch, the control pin of described heat exchange controller is connected in the control end of described first and second electronic switch, the second end of described the first electronic switch is connected with the second end of described the second electronic switch, the first end of described the second electronic switch is successively through described the 4th resistance and described the first capacity earth, the first end of described the second electronic switch is also connected in the negative electrode of described diode, the node of the anodic bonding of described diode between described the 4th resistance and described the first electric capacity, when the voltage of monitoring when described monitoring pin is not less than the predeterminated voltage of described monitoring pin and the electric current that passes through described the 3rd resistance that described first and second induction pin is detected and is not less than the predetermined current of described heat exchange controller, described control pin output high level signal, when the voltage of monitoring when described monitoring pin is less than the predeterminated voltage of described monitoring pin or the electric current that passes through described the 3rd resistance that described first and second induction pin is detected and is less than the predetermined current of described heat exchange controller, described control pin output low level signal, when the control end of described the first electronic switch receives high level signal, the first end of described the first electronic switch and the second end conducting, when the control end of described the first electronic switch receives low level signal, the first end of described the first electronic switch and the second end disconnect, when the control end of described the second electronic switch receives high level signal, the first end of described the second electronic switch and the second end conducting, when the control end of described the second electronic switch receives low level signal, the first end of described the second electronic switch and the second end disconnect.
2. power circuit as claimed in claim 1, it is characterized in that: described power circuit also comprises a CPLD, one the 3rd electronic switch and one the 5th resistance, the control end of described the 3rd electronic switch is connected in described CPLD, the first end of described the 3rd electronic switch is connected in the first end of described the second electronic switch, the second end ground connection of described the 3rd electronic switch by one the 5th resistance; When civil power is normal, described CPLD output low level signal, the first end of described the 3rd electronic switch and the second end disconnect, when civil power power-off and described mainboard complete data storage, described CPLD output high level signal, the first end of described the 3rd electronic switch and the second end conducting.
3. power circuit as claimed in claim 2, is characterized in that: described the 3rd electronic switch is N-type field effect transistor, and the control end of described the 3rd electronic switch, first end and the second end be grid, drain electrode and the source electrode of corresponding N-type field effect transistor respectively.
4. power circuit as claimed in claim 1, it is characterized in that: described first and second electronic switch is N-type field effect transistor, the control end of described first and second electronic switch, first end and the second end be grid, drain electrode and the source electrode of corresponding N-type field effect transistor respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310195487.9A CN104182023A (en) | 2013-05-24 | 2013-05-24 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310195487.9A CN104182023A (en) | 2013-05-24 | 2013-05-24 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104182023A true CN104182023A (en) | 2014-12-03 |
Family
ID=51963145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310195487.9A Pending CN104182023A (en) | 2013-05-24 | 2013-05-24 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104182023A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106484063A (en) * | 2016-09-22 | 2017-03-08 | 北京机械设备研究所 | A kind of program control power switch circuit for robot electric power system |
-
2013
- 2013-05-24 CN CN201310195487.9A patent/CN104182023A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106484063A (en) * | 2016-09-22 | 2017-03-08 | 北京机械设备研究所 | A kind of program control power switch circuit for robot electric power system |
| CN106484063B (en) * | 2016-09-22 | 2019-03-29 | 北京机械设备研究所 | A kind of program-controlled power switch circuit and working method for robot power supply system |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141203 |
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| WD01 | Invention patent application deemed withdrawn after publication |