CN202373958U - Over/under voltage protection circuit - Google Patents
Over/under voltage protection circuit Download PDFInfo
- Publication number
- CN202373958U CN202373958U CN 201120559879 CN201120559879U CN202373958U CN 202373958 U CN202373958 U CN 202373958U CN 201120559879 CN201120559879 CN 201120559879 CN 201120559879 U CN201120559879 U CN 201120559879U CN 202373958 U CN202373958 U CN 202373958U
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- voltage
- circuit
- protection circuit
- voltage protection
- over under
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- Expired - Lifetime
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- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an over/under voltage protection circuit, which comprises a signal input end, a bleeder circuit, a voltage comparing unit, a field-effect tube and an over/under voltage signal sending end, wherein the signal input end is connected in the bleeder circuit, the bleeder circuit is connected in the voltage comparing unit, the voltage comparing unit is connected in the field-effect tube, and the field-effect tube is connected in the over/under voltage signal sending end. The utility model provides the over/under voltage protection circuit capable of effectively protecting a power supply.
Description
Technical field
The utility model belongs to computer power supply control technology field, relates to a kind of over under-voltage protection circuit, relates in particular to over under-voltage protection circuit used in a kind of aircraft computer.
Background technology
Each Switching Power Supply all has its normal power supply scope, if power input voltage exceeds this scope, gently then power supply inside components and parts is impacted, and is heavy then influence the safety of power supply rear end using electricity system, causes an immeasurable loss; Therefore design a cover protective device, make a response in off-limits very first time of power supply supply power voltage, send signal, the protection power supply is closed output and is very important.
The utility model content
In order to solve the above-mentioned technical problem that exists in the background technology, the utility model provides a kind of over under-voltage protection circuit that can effectively protect power supply.
The technical solution of the utility model is: the utility model provides a kind of over under-voltage protection circuit, and its special character is: said over under-voltage protection circuit comprises that signal input part, bleeder circuit, voltage comparison unit, FET and overvoltage/undervoltage signal send end; Said signal input part inserts bleeder circuit; Said bleeder circuit inserts voltage comparison unit; Said voltage comparison unit inserts FET; Said FET inserts the overvoltage/undervoltage signal and sends end.
Above-mentioned voltage comparison unit comprises overvoltage comparison circuit and under-voltage comparison circuit; Said over under-voltage protection circuit also comprises potentiometer; Said bleeder circuit inserts FET through potentiometer and under-voltage comparison circuit successively; Said bleeder circuit inserts FET through potentiometer and overvoltage comparison circuit successively.
Above-mentioned over under-voltage protection circuit also comprises the filter circuit that is connected in parallel with bleeder circuit.
Above-mentioned filter circuit is the electric capacity that comprises three parallel connections.
Above-mentioned potentiometer is an adjustable resistance.
Above-mentioned bleeder circuit is to be composed in series by two potentiometers and three resistance.
The utility model has the advantages that: the over under-voltage protection circuit that the utility model provides has this device 4 exits is arranged, 2 adjustable sides; When the power supply supply power voltage was in normal range (NR), the A point voltage was higher than reference voltage, and the B point voltage is lower than reference voltage, and the C point voltage is low, and V5 ends, and 4 ends keep power remove terminal previous status, and power supply is normally exported; When the power supply supply power voltage was higher than normal range (NR), the A point voltage was higher than reference voltage, and the B point voltage also is higher than reference voltage, and the C point voltage is high, the V5 conducting, and 4 ends drag down the power remove terminal, and power protection is closed output; When the power supply supply power voltage was lower than normal range (NR), the A point voltage was lower than reference voltage, and the B point voltage also is lower than reference voltage, and the C point voltage is high, the V5 conducting, and 4 ends drag down the power remove terminal, and power protection is closed output; The utility model can effectively be protected power supply.
Description of drawings
Fig. 1 is the over under-voltage protection circuit schematic diagram that the utility model provides;
Embodiment
The utility model provides a kind of over under-voltage protection circuit, and this protective circuit comprises signal input part, bleeder circuit, voltage comparison unit, FET and signal output part; Bleeder circuit inserts FET through voltage comparison unit; Signal input part inserts bleeder circuit; FET inserts signal output part.
Voltage comparison unit comprises overvoltage comparison circuit and under-voltage comparison circuit; Over under-voltage protection circuit also comprises potentiometer; Bleeder circuit inserts FET through potentiometer and under-voltage comparison circuit successively; Bleeder circuit inserts FET through potentiometer and overvoltage comparison circuit successively, and potentiometer is an adjustable resistance.
Over under-voltage protection circuit also comprises the filter circuit that is connected in parallel with bleeder circuit.
Filter circuit is that 3 shunt capacitances are formed, and plays filtering and removes the effect of disturbing.
Bleeder circuit is that 2 potentiometers and 3 resistance are composed in series;
The core of the utility model is: when the computer power supply power supply exceeds normal range (NR), send signal, protection power supply and rear end using electricity system.
Referring to Fig. 1, this device has 4 exits, 2 adjustable sides.1 (Vcctest) end is the input voltage monitoring client, and the voltage of needs monitoring is gone into from this termination; 2 (Vcc) end provides power supply for this device chip; 3 (GND) are earth terminal; 4 (Control) end sends end for the overvoltage/undervoltage signal, connects the shutoff terminal of power module; Potentiometer K1, K2 are used for accurately regulating, the under-voltage protection point.
The operation principle of the over under-voltage protection circuit that the utility model provided is: R1, R2, R3, C1, C2; C3, K1, K2 constitutes the input voltage sample circuit, and K1, K2 can regulate overvoltage/undervoltage protection point as required; Capacitor C 1, C2, the alternating component in the C3 filtering sampled signal guarantees the pure of sampled signal; V1 is the 5V standard of precision voltage, for comparator provides accurate comparative voltage; V2 is the voltage-stabiliser tube of 12.5V1W, when supply power voltage is higher, protects this device; V5 is the positive-negative-positive FET.
When the power supply supply power voltage was in normal range (NR), the A point voltage was higher than reference voltage, and the B point voltage is lower than reference voltage, and the C point voltage is low, and V5 ends, and 4 ends keep power remove terminal previous status, and power supply is normally exported; When the power supply supply power voltage was higher than normal range (NR), the A point voltage was higher than reference voltage, and the B point voltage also is higher than reference voltage, and the C point voltage is high, the V5 conducting, and 4 ends drag down the power remove terminal, and power protection is closed output;
When the power supply supply power voltage was lower than normal range (NR), the A point voltage was lower than reference voltage, and the B point voltage also is lower than reference voltage, and the C point voltage is high, the V5 conducting, and 4 ends drag down the power remove terminal, and power protection is closed output.
Claims (6)
1. over under-voltage protection circuit, it is characterized in that: said over under-voltage protection circuit comprises that signal input part, bleeder circuit, voltage comparison unit, FET and overvoltage/undervoltage signal send end; Said signal input part inserts bleeder circuit; Said bleeder circuit inserts voltage comparison unit; Said voltage comparison unit inserts FET; Said FET inserts the overvoltage/undervoltage signal and sends end.
2. over under-voltage protection circuit according to claim 1 is characterized in that: said voltage comparison unit comprises overvoltage comparison circuit and under-voltage comparison circuit; Said over under-voltage protection circuit also comprises potentiometer; Said bleeder circuit inserts FET through potentiometer and under-voltage comparison circuit successively; Said bleeder circuit inserts FET through potentiometer and overvoltage comparison circuit successively.
3. over under-voltage protection circuit according to claim 2 is characterized in that: said over under-voltage protection circuit also comprises the filter circuit that is connected in parallel with bleeder circuit.
4. over under-voltage protection circuit according to claim 3 is characterized in that: said filter circuit is the electric capacity that comprises three parallel connections.
5. over under-voltage protection circuit according to claim 2 is characterized in that: said potentiometer is an adjustable resistance.
6. according to the described over under-voltage protection circuit of the arbitrary claim of claim 1-5, it is characterized in that: said bleeder circuit is to be composed in series by two potentiometers and three resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120559879 CN202373958U (en) | 2011-12-28 | 2011-12-28 | Over/under voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120559879 CN202373958U (en) | 2011-12-28 | 2011-12-28 | Over/under voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202373958U true CN202373958U (en) | 2012-08-08 |
Family
ID=46597649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120559879 Expired - Lifetime CN202373958U (en) | 2011-12-28 | 2011-12-28 | Over/under voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202373958U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577994A (en) * | 2013-10-24 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Chargeable lamp and chargeable over-voltage protection circuit thereof |
| CN104638608A (en) * | 2013-11-06 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN107449959A (en) * | 2017-07-25 | 2017-12-08 | 郑州瑞能电源技术有限公司 | Input over under-voltage protection circuit |
| CN111913031A (en) * | 2020-06-30 | 2020-11-10 | 中国北方发动机研究所(天津) | Detection alarm circuit for input overvoltage and undervoltage |
-
2011
- 2011-12-28 CN CN 201120559879 patent/CN202373958U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577994A (en) * | 2013-10-24 | 2015-04-29 | 深圳市海洋王照明工程有限公司 | Chargeable lamp and chargeable over-voltage protection circuit thereof |
| CN104638608A (en) * | 2013-11-06 | 2015-05-20 | 深圳市海洋王照明工程有限公司 | Protection circuit |
| CN107449959A (en) * | 2017-07-25 | 2017-12-08 | 郑州瑞能电源技术有限公司 | Input over under-voltage protection circuit |
| CN111913031A (en) * | 2020-06-30 | 2020-11-10 | 中国北方发动机研究所(天津) | Detection alarm circuit for input overvoltage and undervoltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |
|
| CX01 | Expiry of patent term |