CN204696664U - The output overvoltage undervoltage protection device of DC-DC power source - Google Patents
The output overvoltage undervoltage protection device of DC-DC power source Download PDFInfo
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- CN204696664U CN204696664U CN201520439770.6U CN201520439770U CN204696664U CN 204696664 U CN204696664 U CN 204696664U CN 201520439770 U CN201520439770 U CN 201520439770U CN 204696664 U CN204696664 U CN 204696664U
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Abstract
The utility model provides a kind of output overvoltage undervoltage protection device of DC-DC power source, comprising: voltage sampling input, under-voltage output control terminal, overvoltage output control terminal; Undervoltage detection circuit, comprise the first triode, the second triode and the first voltage stabilizing didoe, the base stage of the first triode is connected with the collector electrode of the second triode, the base stage of the second triode is connected with one end of the first voltage stabilizing didoe, the collector electrode of the first triode is connected with under-voltage output control terminal, and voltage sampling input is connected with the base stage of the first triode and the other end of the first voltage stabilizing didoe; Over-voltage detection circuit, comprises the 3rd triode and the second voltage stabilizing didoe, and voltage sampling input is connected with the base stage of the 3rd triode by the second voltage stabilizing didoe, and the collector electrode of the 3rd triode is connected with overvoltage output control terminal.The utility model element is few, wiring is simple, cost is low, fast response time, and failure rate reduces greatly, and maintenance is got up also very simple.
Description
Technical field
The utility model relates to DC-DC power source field, particularly a kind of output overvoltage undervoltage protection device of DC-DC power source.
Background technology
Power supply output overvoltage, under-voltage protecting circuit major part mentality of designing is the mode adopting voltage, current sampling, then controls to export by operation amplifier, voltage compare.This core is wherein comparison circuit, realizes level compare with comparison circuit, and the many and complex circuit of element, simultaneous faults rate is also higher, has a lot of unfavorable factor to production test.
Mainly there is following shortcoming in the output overvoltage under-voltage protection of DC-DC power source of the prior art: 1. circuit element is many, and wiring is complicated; 2. cost is higher; 3. in production and application, failure rate is high, maintenance is complicated.
Utility model content
The utility model provides that a kind of element is few, wiring is simple, cost is low, fast response time, failure rate is low, the simple DC-DC power source of maintenance output overvoltage undervoltage protection device.
For solving the problem, as an aspect of the present utility model, providing a kind of output overvoltage undervoltage protection device of DC-DC power source, comprising: voltage sampling input, under-voltage output control terminal, overvoltage output control terminal; Undervoltage detection circuit, comprise the first triode, the second triode and the first voltage stabilizing didoe, the base stage of the first triode is connected with the collector electrode of the second triode, the base stage of the second triode is connected with one end of the first voltage stabilizing didoe, the collector electrode of the first triode is connected with under-voltage output control terminal, and voltage sampling input is connected with the base stage of the first triode and the other end of the first voltage stabilizing didoe; Over-voltage detection circuit, comprises the 3rd triode and the second voltage stabilizing didoe, and voltage sampling input is connected with the base stage of the 3rd triode by the second voltage stabilizing didoe, and the collector electrode of the 3rd triode is connected with overvoltage output control terminal.
Preferably, the equal ground connection of emitter of the first triode, the second triode and the 3rd triode.
Preferably, the base stage of the second triode is connected by the first resistance with one end of the first voltage stabilizing didoe.
Preferably, voltage sampling input is connected by the second resistance with the base stage of the first triode.
Preferably, voltage sampling input is connected with the second voltage stabilizing didoe by the 3rd resistance.
Preferably, under-voltage output control terminal is by the first capacity earth.
Preferably, overvoltage output control terminal is by the second capacity earth.
Owing to have employed technique scheme, the utility model element is few, wiring is simple, cost is low, fast response time, easily control aborning, thus failure rate reduces greatly, and maintenance is got up also very simple, and cost is only the half of traditional design.
Accompanying drawing explanation
Fig. 1 schematically shows structural representation of the present utility model.
Reference numeral in figure: 1, voltage sampling input; 2, under-voltage output control terminal; 3, overvoltage output control terminal; 4, the first triode; 5, the second triode; 6, the first voltage stabilizing didoe; 7, the 3rd triode; 8, the second voltage stabilizing didoe; 9, the first resistance; 10, the second resistance; 11, the 3rd resistance; 12, the first electric capacity; 13, the second electric capacity.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
Please refer to Fig. 1, the utility model provides a kind of output overvoltage undervoltage protection device of DC-DC power source, comprising: voltage sampling input 1, under-voltage output control terminal 2, overvoltage output control terminal 3; Undervoltage detection circuit, comprise the first triode 4, second triode 5 and the first voltage stabilizing didoe 6, the base stage of the first triode 4 is connected with the collector electrode of the second triode 5, the base stage of the second triode 5 is connected with one end of the first voltage stabilizing didoe 6, the collector electrode of the first triode 4 is connected with under-voltage output control terminal 2, and voltage sampling input 1 is connected with the base stage of the first triode 4 and the other end of the first voltage stabilizing didoe 6; Over-voltage detection circuit, comprises the 3rd triode 7 and the second voltage stabilizing didoe 8, and voltage sampling input 1 is connected with the base stage of the 3rd triode 7 by the second voltage stabilizing didoe 8, and the collector electrode of the 3rd triode 7 is connected with overvoltage output control terminal 3.
Voltage sampling input 1 of the present utility model is incorporated into the virtual voltage of DC-DC output in the utility model, when normally working, this voltage between 15V to 20V, and can direct sample, without the need to bypass.During undervoltage detection circuit work, when the sampling voltage of circuit is lower than 15V, the base stage of the second triode 5 is that electronegative potential 0V does not work, the base stage that then sampling voltage is added to the first triode 4 makes the first triode 4 conducting, the now output of under-voltage output control terminal 2 is 0V, thus the master control IC controlling DC-DC power source closes pwm signal, now, power supply no-output.During over-voltage detection circuit work, when the sampling voltage of circuit is higher than 20V, second voltage stabilizing didoe 8 punctures conducting, the base stage that voltage is added to the 3rd triode 7 makes the 3rd triode 7 conducting, overvoltage output control terminal 3 now for controlling the control end of master control IC is pulled down to electronegative potential 0V, thus closedown pwm signal, power supply no-output.
When DC-DC power source normally works, namely voltage sampling input 1 is greater than 15V when being less than 20V, first voltage stabilizing didoe 6 punctures conducting thus powers up the base stage being pressed onto the second triode 5 makes the second triode 5 conducting, then the pole tension of the first triode 4 is that 0V does not work, under-voltage output control terminal 2 is high level, and pwm signal exports normal; But the second voltage stabilizing didoe 8 not conducting, make the base stage of the 3rd triode 7 be that electronegative potential 0V does not work, the master control IC overvoltage control signal of DC-DC power source is high level, and pwm signal exports normal, and power work is normal.
Owing to have employed technique scheme, the utility model element is few, wiring is simple, cost is low, fast response time (being less than 100ms), easily control aborning, thus failure rate reduces greatly, and maintenance is got up also very simple, cost is only the half of traditional design.
Preferably, the equal ground connection of emitter of the first triode 4, second triode 5 and the 3rd triode 7.
Preferably, the base stage of the second triode 5 is connected by the first resistance 9 with one end of the first voltage stabilizing didoe 6.
Preferably, voltage sampling input 1 is connected by the second resistance 10 with the base stage of the first triode 4.
Preferably, voltage sampling input 1 is connected with the second voltage stabilizing didoe 8 by the 3rd resistance 11.
Preferably, under-voltage output control terminal 2 is by the first electric capacity 12 ground connection.First electric capacity 12 is used as the filtering of signal.
Preferably, overvoltage output control terminal 3 is by the second electric capacity 13 ground connection.Second electric capacity 13 is used as the filtering of signal.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (7)
1. an output overvoltage undervoltage protection device for DC-DC power source, is characterized in that, comprising:
Voltage sampling input (1), under-voltage output control terminal (2), overvoltage output control terminal (3);
Undervoltage detection circuit, comprise the first triode (4), second triode (5) and the first voltage stabilizing didoe (6), the base stage of described first triode (4) is connected with the collector electrode of described second triode (5), the base stage of described second triode (5) is connected with one end of described first voltage stabilizing didoe (6), the collector electrode of described first triode (4) is connected with described under-voltage output control terminal (2), described voltage sampling input (1) is connected with the base stage of described first triode (4) and the other end of described first voltage stabilizing didoe (6),
Over-voltage detection circuit, comprise the 3rd triode (7) and the second voltage stabilizing didoe (8), described voltage sampling input (1) is connected by the base stage of described second voltage stabilizing didoe (8) with described 3rd triode (7), and the collector electrode of described 3rd triode (7) is connected with described overvoltage output control terminal (3).
2. the output overvoltage undervoltage protection device of DC-DC power source according to claim 1; it is characterized in that, the equal ground connection of emitter of described first triode (4), described second triode (5) and described 3rd triode (7).
3. the output overvoltage undervoltage protection device of DC-DC power source according to claim 1; it is characterized in that, the base stage of described second triode (5) is connected by the first resistance (9) with described one end of described first voltage stabilizing didoe (6).
4. the output overvoltage undervoltage protection device of DC-DC power source according to claim 1, is characterized in that, described voltage sampling input (1) is connected by the second resistance (10) with the base stage of described first triode (4).
5. the output overvoltage undervoltage protection device of DC-DC power source according to claim 1, is characterized in that, described voltage sampling input (1) is connected with described second voltage stabilizing didoe (8) by the 3rd resistance (11).
6. the output overvoltage undervoltage protection device of DC-DC power source according to claim 1, is characterized in that, described under-voltage output control terminal (2) is by the first electric capacity (12) ground connection.
7. the output overvoltage undervoltage protection device of DC-DC power source according to claim 1, is characterized in that, described overvoltage output control terminal (3) is by the second electric capacity (13) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439770.6U CN204696664U (en) | 2015-06-24 | 2015-06-24 | The output overvoltage undervoltage protection device of DC-DC power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520439770.6U CN204696664U (en) | 2015-06-24 | 2015-06-24 | The output overvoltage undervoltage protection device of DC-DC power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204696664U true CN204696664U (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520439770.6U Expired - Fee Related CN204696664U (en) | 2015-06-24 | 2015-06-24 | The output overvoltage undervoltage protection device of DC-DC power source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099862A (en) * | 2016-06-20 | 2016-11-09 | 华南理工大学 | A kind of low-voltage protection method based on multimode input-series and output-parallel structure |
| CN110416973A (en) * | 2019-07-25 | 2019-11-05 | 珠海格力电器股份有限公司 | Motor overvoltage protection circuit, undervoltage protection circuit, voltage protection circuit and motor |
| WO2024139765A1 (en) * | 2022-12-26 | 2024-07-04 | 京东方科技集团股份有限公司 | Display panel and display apparatus |
-
2015
- 2015-06-24 CN CN201520439770.6U patent/CN204696664U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099862A (en) * | 2016-06-20 | 2016-11-09 | 华南理工大学 | A kind of low-voltage protection method based on multimode input-series and output-parallel structure |
| CN110416973A (en) * | 2019-07-25 | 2019-11-05 | 珠海格力电器股份有限公司 | Motor overvoltage protection circuit, undervoltage protection circuit, voltage protection circuit and motor |
| WO2024139765A1 (en) * | 2022-12-26 | 2024-07-04 | 京东方科技集团股份有限公司 | Display panel and display apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20160624 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |