CN104577962A - Power supply protection system - Google Patents
Power supply protection system Download PDFInfo
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- CN104577962A CN104577962A CN201310505682.7A CN201310505682A CN104577962A CN 104577962 A CN104577962 A CN 104577962A CN 201310505682 A CN201310505682 A CN 201310505682A CN 104577962 A CN104577962 A CN 104577962A
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- Prior art keywords
- triode
- direct voltage
- voltage
- power consumption
- consumption equipment
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Abstract
The invention relates to a power supply protection system which is used for supplying power to electric equipment and comprises a time delay circuit, a comparison circuit and a switching circuit. The time delay circuit receives a first DC (Direct Current) voltage; the DC voltage is used for charging the time delay circuit; after being full charged, the time delay circuit outputs a second DC voltage to the comparison circuit; after comparing the second DC voltage with a reference voltage, the comparison circuit outputs a control signal to the switching circuit; the switching circuit enables the first DC voltage to be electrically communicated with the electric equipment when the second DC voltage is higher than the reference voltage so as to supply power to the electric equipment; and the switching circuit enables electrical connection between the first DC voltage and the electric equipment to be switched off when the first DC voltage is higher than a breakdown voltage, so that the first DC voltage cannot be output to the electric equipment.
Description
Technical field
The present invention relates to a kind of power supply protection system, particularly a kind ofly prevent the excessive power supply protection system burning out power consumption equipment of voltage.
Background technology
Along with the application of the demand of mobile workstation is more and more extensive, the requirement of people to the stability of the micro server in mobile workstation is more and more higher.Existing mobile workstation uses storage battery as portable power source mostly, therefore needs to be changed by the output voltage of voltage conversion circuit to storage battery.In the process of voltage transitions, large voltage can be made directly to be carried on mobile workstation if voltage conversion circuit breaks down, cause mobile workstation to be damaged.
Summary of the invention
In view of above content, be necessary that providing a kind of prevents the excessive power supply protection system burning out power consumption equipment of voltage.
A kind of power supply protection system, with thinking that a power consumption equipment is powered, comprise a delay circuit, one comparison circuit and a switching circuit, described delay circuit receives one first direct voltage, described direct voltage is the charging of described delay circuit, described delay circuit exports one second direct voltage to described comparison circuit after being full of electricity, described second direct voltage and a reference voltage are compared rear output one control signal to described switching circuit by described comparison circuit, described switching circuit described second direct voltage higher than during described reference voltage by described first direct voltage and described power consumption equipment electrical communication, thus power for described power consumption equipment, electrical connection between described first direct voltage and described power consumption equipment disconnects higher than during a puncture voltage at described first direct voltage by described switching circuit, make described first direct voltage cannot export described power consumption equipment to.
Compared with prior art, in above-mentioned power supply protection system, described delay circuit exports one second direct voltage to described comparison circuit after being full of electricity, described second direct voltage and a reference voltage are compared rear output one control signal to described switching circuit by described comparison circuit, described switching circuit described second direct voltage higher than during described reference voltage by described first direct voltage and described power consumption equipment electrical communication, thus power for described power consumption equipment, electrical connection between described first direct voltage and described power consumption equipment disconnects higher than during a puncture voltage at described first direct voltage by described switching circuit, make described first direct voltage cannot export described power consumption equipment to, achieve the protection to described power consumption equipment when described first direct voltage is excessive.
Accompanying drawing explanation
Fig. 1 is a block diagram of a better embodiment of power supply protection system of the present invention.
Fig. 2 is a circuit diagram of a better embodiment of power supply protection system in Fig. 1.
Main element symbol description
| Delay circuit | 10 |
| Comparison circuit | 20 |
| Switching circuit | 30 |
| Power consumption equipment | 40 |
| Comparator | U1 |
| DC power supply | U2 |
| First triode | T1 |
| Second triode | T2 |
| 3rd triode | T3 |
| 4th triode | T4 |
| 5th triode | T5 |
| Field-effect transistor | Q |
| Voltage stabilizing didoe | DZ |
| First diode | D1 |
| Second diode | D2 |
| 3rd diode | D3 |
| 4th diode | D4 |
| 5th diode | D5 |
| First electric capacity | C1 |
| Second electric capacity | C2 |
| 3rd electric capacity | C3 |
| 4th electric capacity | C4 |
| 5th electric capacity | C5 |
| First resistance | R1 |
| Second resistance | R2 |
| 3rd resistance | R3 |
| 4th resistance | R4 |
| 5th resistance | R5 |
| 6th resistance | R6 |
| 7th resistance | R7 |
| 8th resistance | R8 |
| 9th resistance | R9 |
| Tenth resistance | R10 |
| 11 resistance | R11 |
| 12 resistance | R12 |
| 13 resistance | R13 |
| 14 resistance | R14 |
| 15 resistance | R15 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, in a better embodiment of the present invention, a power supply protection system is with thinking that a power consumption equipment 40 is powered, and described power supply protection system comprises delay circuit 10, comparison circuit 20 and a switching circuit 30.Described delay circuit 10 receives one first direct voltage, and described first direct voltage is that described delay circuit 10 charges, and described delay circuit 10 exports one second direct voltage to described comparison circuit 20 after being full of electricity.Described second direct voltage and a reference voltage are compared rear output one control signal to described switching circuit 30 by described comparison circuit 20.Described first direct voltage and described power consumption equipment 40 electrical communication are powered for described power consumption equipment 40 according to the control signal received by described switching circuit 30.
Refer to Fig. 2, described delay circuit 10 comprises one first diode D1, one first electric capacity C1 and one first resistance R1.The anode of described first diode D1 receives described first direct voltage, and the negative electrode of described first diode D1 is electrically connected one end of described first resistance R1.The other end of described first resistance R1 is via described first electric capacity C1 ground connection.Described second direct voltage is exported at the other end of described first resistance R1 after described first electric capacity C1 is full of electricity.
Described comparison circuit 20 comprises a comparator U1, a DC power supply U2, one second diode D2, one the 3rd diode D3, one second electric capacity C2, one the 3rd electric capacity C3, one second resistance R2, one the 3rd resistance R3, one the 4th resistance R4 and the 5th resistance R5.Described comparator U1 comprises input, a reverse input end, an output, a power end and an earth terminal in the same way.Described DC power supply U2 comprises a first end, one second end and an earth terminal.
The reverse input end of described comparator U1 is electrically connected the other end of described first resistance R1, and the reverse input end of described comparator U1 is via described second resistance R2 ground connection.The output of described comparator U1 is electrically connected the anode of described second diode D2 via described 5th resistance R5, the output of described comparator U1 is electrically connected the anode of described 3rd diode D3.The negative electrode of described second diode D2 is through ground connection.The negative electrode of described 3rd diode D3 exports described control signal.The power end of described comparator U1 is via described 3rd electric capacity C3 ground connection.The first end of described DC power supply U2 is electrically connected the negative electrode of described first diode D1, and the first end of described DC power supply U2 is via described second electric capacity C2 ground connection.Second end of described DC power supply U2 is electrically connected the power end of described comparator U1, and second end of described DC power supply U2 is electrically connected one end of described 3rd resistance R3.The other end of described 3rd resistance R3 is electrically connected the input in the same way of described comparator U1, and the other end of described 3rd resistance R3 is via described 4th resistance R4 ground connection.
Described switching circuit 30 comprises one first triode T1, one second triode T2, one the 3rd triode T3, one the 4th triode T4, one the 5th triode T5, one field-effect transistor Q, one voltage stabilizing didoe DZ, one the 4th diode D4, one the 5th diode D5, one the 6th resistance R6, one the 7th resistance R7, one the 8th resistance R8, one the 9th resistance R9, the a tenth resistance R10, the a 11 resistance R11, the a 12 resistance R12, the a 13 resistance R13, the a 14 resistance R14, the a 15 resistance R15, one the 4th electric capacity C4 and the 5th electric capacity C5.Each first triode T1, the second triode T2, the 3rd triode T3, the 4th triode T4 and the 5th triode T5 comprise a base stage, an emitter and a collector electrode respectively.Described field-effect transistor Q comprises a grid, one source pole and a drain electrode.
The anode of described 4th diode D4 receives described first direct voltage, and the negative electrode of described 4th diode D4 is electrically connected the negative electrode of described voltage stabilizing didoe DZ.The anode of described voltage stabilizing didoe DZ is electrically connected the anode of described 5th diode D5.The negative electrode of described 5th diode D5 is electrically connected the base stage of described first triode T1 via described 6th resistance R6.The base stage of described first triode T1 is electrically connected the negative electrode of described 3rd diode D3 to receive described control signal.The grounded emitter of described first triode T1.The collector electrode of described first triode T1 is electrically connected the negative electrode of described 4th diode D4 via described 7th resistance R7, the collector electrode of described first triode T1 is electrically connected the base stage of described second triode T2.The grounded emitter of described second triode T2.The collector electrode of described second triode T2 is electrically connected the negative electrode of described 4th diode D4 via described 8th resistance R8, the collector electrode of described second triode T2 is electrically connected the base stage of described 3rd triode T3 via described 9th resistance R9.
The emitter of described 3rd triode T3 is electrically connected the negative electrode of described 4th diode D4 via described tenth resistance R10.The collector electrode of described 3rd triode T3 is electrically connected the base stage of described 4th triode T4 via described 11 resistance R11.The base stage of described 4th triode T4 is via described 12 resistance R12 ground connection.The grounded emitter of described 4th triode T4.The collector electrode of described 4th triode T4 receives described first direct voltage via described 13 resistance R13, and the collector electrode of described 4th triode T4 is electrically connected the base stage of described 5th triode T5.The grounded emitter of described 5th triode T5.The collector electrode of described 5th triode T5 receives described first direct voltage via described 14 resistance R14, and the collector electrode of described 5th triode T5 is electrically connected the grid of described field-effect transistor Q.The drain electrode of described field-effect transistor Q receives described first direct voltage.The source electrode of described field-effect transistor Q is respectively via described 15 resistance R15, described 4th electric capacity C4 and described 5th electric capacity C5 ground connection.The source electrode of described field-effect transistor Q is electrically connected described power consumption equipment 40.
Wherein, described first triode T1, described second triode T2, described 4th triode T4 and described 5th triode T5 are NPN type triode.Described 3rd triode T3 is PNP type triode.Described field-effect transistor Q is N slot field-effect transistor.Described second diode D2 is light-emitting diode.The size of described first direct voltage is+12V.The output voltage range of described DC power supply U2 is+8V-+10V.The puncture voltage of described voltage stabilizing didoe DZ is+12.5V.Power supply protection system of the present invention can have the voltage stabilizing didoe DZ of corresponding puncture voltage according to the different choice of the utilization voltage of described power consumption equipment 40, make described power supply protection system can for different power consumption equipment 40 generation effects.
During work; when first direct voltage of described+12V accesses described power supply protection system; because the size of described first direct voltage is lower than the puncture voltage of described voltage stabilizing didoe DZ; described first direct voltage and described first triode T1 are isolated by described voltage stabilizing didoe DZ, make described first direct voltage cannot transfer to the base stage of described first triode T1.Described first direct voltage is that described first electric capacity C1 charges via described first diode D1 and described first resistance R1, and described DC power supply U2 produces described reference voltage by described 3rd resistance R3 and described 4th resistance R4 at the input in the same way of described comparator U1 simultaneously.
Described first direct voltage be described first electric capacity C1 charge to described second direct voltage lower than described reference voltage before, the voltage of the reverse input end of described comparator U1 is lower than the voltage of the input in the same way of described comparator U1.The output of described comparator U1 exports the control signal of high potential, and described second diode D2 is luminous.The control signal of described high potential transfers to the base stage of described first triode T1 via described 3rd diode D3 and described 6th resistance R6.Described first triode T1 conducting, the current collection very electronegative potential of described first triode T1.The base stage of described second triode T2 is electronegative potential, and described second triode T2 ends, the current collection very high potential of described second triode T2.The base stage of described 3rd triode T3 is high potential, and described 3rd triode T3 ends, the current collection very electronegative potential of described 3rd triode T3.The base stage of described 4th triode T4 is electronegative potential, and described 4th triode T4 ends, the current collection very high potential of described 4th triode T4.The base stage of described 5th triode T5 is high potential, described 5th triode T5 conducting, the current collection very electronegative potential of described 5th triode T5.The grid of described field-effect transistor Q is electronegative potential, and described field-effect transistor Q ends.Electrical connection between described first direct voltage and described power consumption equipment 40 disconnects by described field-effect transistor Q, makes first direct voltage of described+12V cannot export described power consumption equipment 40 to.
When described first direct voltage be described first electric capacity C1 charge to described second direct voltage higher than described reference voltage time, the voltage of the reverse input end of described comparator U1 is higher than the voltage of the input in the same way of described comparator U1.The output of described comparator U1 exports the control signal of electronegative potential, and described second diode D2 is not luminous.The control signal of described electronegative potential is isolated by described 3rd diode D3, makes the control signal of described electronegative potential also cannot transfer to the base stage of described first triode T1.Described first triode T1 does not work and is in cut-off state, makes described second triode T2, described 3rd triode T3 and described 4th triode T4 conducting successively.Described 5th triode T5 ends, and makes described field-effect transistor Q conducting.Described field-effect transistor Q, by described first direct voltage and described power consumption equipment 40 electrical communication, makes first direct voltage output of described+12V to described power consumption equipment 40 thus powers for described power consumption equipment 40.
Due to the delay protection effect of described delay circuit 10; described first direct voltage just can be exported to described power consumption equipment 40 after a period of time of charging to described first electric capacity C1; make described first direct voltage be increased to described second direct voltage higher than described reference voltage before can not be exported to described power consumption equipment 40, and then described power consumption equipment 40 to be played a protective role.
When accessing puncture voltage higher than described voltage stabilizing didoe DZ of described first direct voltage of described power supply protection system; described voltage stabilizing didoe DZ is reversed and punctures, and described first direct voltage transfers to the base stage of described first triode T1 in turn via described voltage stabilizing didoe DZ, described 5th diode D5 and described 6th resistance R6.Voltage simultaneously on described first electric capacity C1, still higher than described reference voltage, makes the voltage of the reverse input end of described comparator U1 higher than the voltage of the input in the same way of described comparator U1.The output of described comparator U1 still exports the control signal of electronegative potential, and described second diode D2 maintains non-luminous state.The control signal of described electronegative potential still cannot transfer to the base stage of described first triode T1 under the buffer action of described 3rd diode D3.Now described first triode T1 conducting, makes described second triode T2, described 3rd triode T3 and described 4th triode T4 end successively.Described 5th triode T5 conducting, makes described field-effect transistor Q end.Electrical connection between described first direct voltage and described power consumption equipment 40 disconnects by described field-effect transistor Q again, makes the first direct voltage too much cannot export described power consumption equipment 40 to, furthermore achieved that the protection to described power consumption equipment 40.
Claims (10)
1. a power supply protection system, with thinking that a power consumption equipment is powered, comprise a delay circuit, one comparison circuit and a switching circuit, it is characterized in that: described delay circuit receives one first direct voltage, described direct voltage is the charging of described delay circuit, described delay circuit exports one second direct voltage to described comparison circuit after being full of electricity, described second direct voltage and a reference voltage are compared rear output one control signal to described switching circuit by described comparison circuit, described switching circuit described second direct voltage higher than during described reference voltage by described first direct voltage and described power consumption equipment electrical communication, thus power for described power consumption equipment, electrical connection between described first direct voltage and described power consumption equipment disconnects higher than during a puncture voltage at described first direct voltage by described switching circuit, make described first direct voltage cannot export described power consumption equipment to.
2. power supply protection system as claimed in claim 1; it is characterized in that: described comparison circuit is at described second direct voltage higher than exporting the control signal of an electronegative potential to described switching circuit during described reference voltage, described switching circuit is by described first direct voltage and described power consumption equipment electrical communication.
3. power supply protection system as claimed in claim 2; it is characterized in that: described comparison circuit is at described second direct voltage lower than exporting the control signal of a high potential to described switching circuit during described reference voltage, the electrical connection between described first direct voltage and described power consumption equipment disconnects by described switching circuit.
4. power supply protection system as claimed in claim 3; it is characterized in that: described switching circuit is at described first direct voltage higher than receiving described first direct voltage during described puncture voltage, and the electrical connection between described first direct voltage and described power consumption equipment disconnects by described switching circuit.
5. power supply protection system as claimed in claim 4; it is characterized in that: described delay circuit comprises one first electric capacity and one first resistance; one end of described first resistance receives described first direct voltage; the other end of described first resistance, via described first capacity earth, exports described second direct voltage at the other end of described first resistance after described first electric capacity is full of electricity.
6. power supply protection system as claimed in claim 5; it is characterized in that: described comparison circuit comprises a comparator and one the 3rd diode; described comparator comprises input, a reverse input end and an output in the same way; the reverse input end of described comparator is electrically connected the other end of described first resistance to receive described second direct voltage; the input in the same way of described comparator receives described reference voltage; the output of described comparator is electrically connected the anode of described 3rd diode, and the negative electrode of described 3rd diode exports described control signal.
7. power supply protection system as claimed in claim 6, it is characterized in that: described switching circuit comprises one first triode, one second triode, one the 3rd triode, one the 4th triode, one the 5th triode, one field-effect transistor and a voltage stabilizing didoe, the negative electrode of described voltage stabilizing didoe receives described first direct voltage, the anode of described voltage stabilizing didoe is electrically connected the negative electrode of described first triode and described 3rd diode to receive described control signal, described first triode at described second direct voltage lower than conducting during described reference voltage, make described second triode, described 3rd triode and described 4th triode end successively, described 5th triode ON, described field-effect transistor is ended, and then the electrical connection between described first direct voltage and described power consumption equipment is disconnected.
8. power supply protection system as claimed in claim 7; it is characterized in that: described first triode ends higher than during described reference voltage at described second direct voltage; make described second triode, described 3rd triode and described 4th triode conducting successively; described 5th triode cut-off; make described field-effect transistor conducting, and then described first direct voltage and described power consumption equipment electrical communication are also powered for described power consumption equipment.
9. power supply protection system as claimed in claim 8; it is characterized in that: described first triode at described first direct voltage higher than conducting during described puncture voltage; described second triode, described 3rd triode and described 4th triode are ended successively; described 5th triode ON; described field-effect transistor is ended, and then the electrical connection between described first direct voltage and described power consumption equipment is disconnected.
10. power supply protection system as claimed in claim 8 or 9; it is characterized in that: described first triode, described second triode, described 4th triode and described 5th triode are NPN type triode; described 3rd triode is PNP type triode, and described field-effect transistor is N slot field-effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310505682.7A CN104577962A (en) | 2013-10-24 | 2013-10-24 | Power supply protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310505682.7A CN104577962A (en) | 2013-10-24 | 2013-10-24 | Power supply protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104577962A true CN104577962A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310505682.7A Pending CN104577962A (en) | 2013-10-24 | 2013-10-24 | Power supply protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104577962A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109089071A (en) * | 2018-10-09 | 2018-12-25 | 六安腾达信息科技有限公司 | Net meeting system |
| CN109818343A (en) * | 2017-11-20 | 2019-05-28 | 深圳光峰科技股份有限公司 | A kind of overvoltage crowbar and projector |
-
2013
- 2013-10-24 CN CN201310505682.7A patent/CN104577962A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818343A (en) * | 2017-11-20 | 2019-05-28 | 深圳光峰科技股份有限公司 | A kind of overvoltage crowbar and projector |
| CN109818343B (en) * | 2017-11-20 | 2021-06-08 | 深圳光峰科技股份有限公司 | Overvoltage protection circuit and projector |
| CN109089071A (en) * | 2018-10-09 | 2018-12-25 | 六安腾达信息科技有限公司 | Net meeting system |
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Application publication date: 20150429 |