CN205029315U - Direct -current overvoltage protection circuit - Google Patents
Direct -current overvoltage protection circuit Download PDFInfo
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- CN205029315U CN205029315U CN201520696990.7U CN201520696990U CN205029315U CN 205029315 U CN205029315 U CN 205029315U CN 201520696990 U CN201520696990 U CN 201520696990U CN 205029315 U CN205029315 U CN 205029315U
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Abstract
The utility model relates to a direct -current overvoltage protection circuit, including power input end and connected load's power output end a triode Q1, resistance R2 connecting resistance R1 and stabilivolt D1's positive pole is respectively passed through to triode Q1's base, resistance R1 ground connection, stabilivolt D1's the negative pole input of connecting, triode Q1's collecting electrode through the resistance R3 input of connecting, triode Q2's base is still connected to triode Q1's collecting electrode through resistance R5, triode Q2's collecting electrode and power input end between be connected a relay J's coil both ends, triode Q2's emitter ground. The utility model discloses a relay operation opens intercommunication and disconnection between control power output end and the power input end, simple structure, and the reaction is fast, and not good malfunction.
Description
Technical field
The utility model relates to a kind of voltage protection circuit.
Background technology
Direct current input product protected mode is in the market generally fuse-link overcurrent protection (fuse) and IC control board protection (detection input voltage); the former protected mode is along with electric current increases to certain value and open fuse; thus cut-out circuit; shield; generally, the reaction speed of protection is relatively slow, if when having transient high voltage to input; also because of the problem in reaction time, cannot can disconnect instantaneously and circuit protection be lost efficacy.The latter IC controls, and is generally used in mid-to high-end product, structure relative complex, and IC chip industry can because the situation such as environment for use and circuit interference, and occurring that program error causes cannot available protecting, and stability exists certain hidden danger.
Summary of the invention
In order to overcome the above-mentioned deficiency of prior art, the utility model provides a kind of DC over-voltage protection circuit adopting the high-precision relay of high-quality.
The technical scheme in the invention for solving the technical problem is:
A kind of DC over-voltage protection circuit, comprise power input and connect the power output end of load, it is characterized in that: comprise a triode Q1, the base stage of triode Q1 passes through the positive pole of resistance R2 difference contact resistance R1 and voltage-stabiliser tube D1, described resistance R1 ground connection, the negative pole of described voltage-stabiliser tube D1 connects power input, the collector electrode of described triode Q1 connects power input by resistance R3, the collector electrode of triode Q1 is also by the base stage of resistance R5 connecting triode Q2, collector electrode and the coil two ends being connected a relay J between power input of described triode Q2, resistance R4 and electric capacity C1 is also connected in parallel between the collector electrode of described triode Q1 and ground, the grounded emitter of triode Q2.
As preferably, voltage-stabiliser tube D1 is IN4744, and described triode Q1, triode Q2 are 2N5551.
As preferably, resistance R1 is 10K, and resistance R2, resistance R3, resistance R5 are 4.7K, and resistance R4 is 1K, and electric capacity C1 is 1 μ F.
When supply voltage is normal, due to the existence of voltage-stabiliser tube, voltage stabilization is at 15V, because resistance R1 two ends have voltage to exist, therefore triode Q1 conducting, then the collector voltage of triode Q1 is lower, and triode Q2 ends, now the coil two ends no current of relay J passes through, relay is failure to actuate, when there being interference voltage to enter, and now voltage-stabiliser tube D1 reverse breakdown, triode Q1 ends, the base voltage of triode Q2 higher than bias voltage, triode Q2 conducting, the coil two ends of relay J have electric current to pass through, the actuating of relay, cuts off circuit.
The utility model provides a kind of new protected mode; have employed the high-precision relay of high-quality; circuit carries out the circuit structure process of relay shell fragment adhesive action; ensure completely within the scope of design load; relay can not misoperation, once exceed design load, relay just starts action; thus ensure to cut off circuit, protect.
The beneficial effects of the utility model are: the utility model is opened by the actuating of relay and controlled power output end and being communicated with and disconnection between power input, and structure is simple, and reaction is fast, and bad misoperation.
Accompanying drawing explanation
Fig. 1 is the utility model circuit structure block diagram.
Fig. 2 is the utility model electrical block diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As Fig. 1, shown in 2, a kind of DC over-voltage protection circuit, comprise power input 1 and connect the power output end 2 of load, comprise a triode Q1, the base stage of triode Q1 passes through the positive pole of resistance R2 difference contact resistance R1 and voltage-stabiliser tube D1, described resistance R1 ground connection, the negative pole of described voltage-stabiliser tube D1 connects power input, the collector electrode of described triode Q1 connects power input by resistance R3, the collector electrode of triode Q1 is also by the base stage of resistance R5 connecting triode Q2, collector electrode and the coil two ends being connected a relay between power input of described triode Q2, resistance R4 and electric capacity C1 is also connected in parallel between the collector electrode of described triode Q1 and ground, the grounded emitter of triode Q2.Voltage-stabiliser tube D1 is IN4744, and described triode Q1, triode Q2 are 2N5551.Resistance R1 is 10K, and resistance R2, resistance R3, resistance R5 are 4.7K, and resistance R4 is 1K, and electric capacity C1 is 1 μ F.Relay J is closed type, and the input of relay J is connected power input and power output end respectively with output.
When supply voltage is normal, due to the existence of voltage-stabiliser tube, voltage stabilization is at 15V, because resistance R1 two ends have voltage to exist, therefore triode Q1 conducting, then the collector voltage of triode Q1 is lower, and triode Q2 ends, now the coil two ends no current of relay passes through, relay is failure to actuate, when there being interference voltage to enter, and now voltage-stabiliser tube D1 reverse breakdown, triode Q1 ends, the base voltage of triode Q2 higher than bias voltage, triode Q2 conducting, the coil two ends of relay have electric current to pass through, the actuating of relay, cuts off circuit.Relay is normally closed type, after action, opens cut-out circuit.
The utility model provides a kind of new protected mode; have employed the high-precision relay of high-quality; circuit carries out the circuit structure process of relay shell fragment adhesive action; ensure completely within the scope of design load; relay can not misoperation, once exceed design load, relay just starts action; thus ensure to cut off circuit, protect.
The utility model is opened by the actuating of relay and is controlled power output end and being communicated with and disconnection between power input, and structure is simple, and reaction is fast, and bad misoperation.
Claims (3)
1. a DC over-voltage protection circuit, comprise power input and connect the power output end of load, it is characterized in that: comprise a triode Q1, the base stage of triode Q1 passes through the positive pole of resistance R2 difference contact resistance R1 and voltage-stabiliser tube D1, described resistance R1 ground connection, the negative pole of described voltage-stabiliser tube D1 connects power input, the collector electrode of described triode Q1 connects power input by resistance R3, the collector electrode of triode Q1 is also by the base stage of resistance R5 connecting triode Q2, collector electrode and the coil two ends being connected a relay J between power input of described triode Q2, resistance R4 and electric capacity C1 is also connected in parallel between the collector electrode of described triode Q1 and ground, the grounded emitter of triode Q2.
2. a kind of DC over-voltage protection circuit according to claim 1, is characterized in that: described voltage-stabiliser tube D1 is IN4744, and described triode Q1, triode Q2 are 2N5551.
3. a kind of DC over-voltage protection circuit according to claim 2, is characterized in that: described resistance R1 is 10K, and resistance R2, resistance R3, resistance R5 are 4.7K, and resistance R4 is 1K, and electric capacity C1 is 1 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520696990.7U CN205029315U (en) | 2015-09-10 | 2015-09-10 | Direct -current overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520696990.7U CN205029315U (en) | 2015-09-10 | 2015-09-10 | Direct -current overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205029315U true CN205029315U (en) | 2016-02-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520696990.7U Active CN205029315U (en) | 2015-09-10 | 2015-09-10 | Direct -current overvoltage protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN205029315U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505516A (en) * | 2016-11-21 | 2017-03-15 | 法乐第(北京)网络科技有限公司 | A kind of overvoltage crowbar and electronic control unit ECU output circuits |
| CN107332491A (en) * | 2017-08-01 | 2017-11-07 | 合肥初慕科技有限公司 | AC inverter driving system device with DC over-voltage protection |
-
2015
- 2015-09-10 CN CN201520696990.7U patent/CN205029315U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505516A (en) * | 2016-11-21 | 2017-03-15 | 法乐第(北京)网络科技有限公司 | A kind of overvoltage crowbar and electronic control unit ECU output circuits |
| CN106505516B (en) * | 2016-11-21 | 2019-06-28 | 法法汽车(中国)有限公司 | A kind of overvoltage crowbar and electronic control unit ECU output circuit |
| CN107332491A (en) * | 2017-08-01 | 2017-11-07 | 合肥初慕科技有限公司 | AC inverter driving system device with DC over-voltage protection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |