CN102568940A - Low voltage operation delay protection drive circuit - Google Patents
Low voltage operation delay protection drive circuit Download PDFInfo
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- CN102568940A CN102568940A CN2010105900959A CN201010590095A CN102568940A CN 102568940 A CN102568940 A CN 102568940A CN 2010105900959 A CN2010105900959 A CN 2010105900959A CN 201010590095 A CN201010590095 A CN 201010590095A CN 102568940 A CN102568940 A CN 102568940A
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Abstract
The invention provides a low voltage operation delay protection drive circuit, which includes a sampling element connected in a to-be-protected circuit and used for sampling the voltage of the to-be-protected circuit, a booster circuit connected with the sampling element and used for boosting the sampled voltage, a conversion circuit connected at an output end of the booster circuit and used for converting the voltage output by the booster circuit, a filter circuit connected with the sampling element and used for filtering the voltage sampled by the sampling element, a first comparison circuit connected with the filter circuit and the conversion circuit respectively, a delay circuit connected at an output end of the first comparison circuit, and a drive circuit connected with the delay circuit and a release respectively and used for driving the release. The low voltage operation delay protection drive circuit has the advantages that the delay protection action is accurate, and the anti-electromagnetic-interference capability is strong.
Description
Technical field
The present invention relates to a kind of delay protection circuit, particularly a kind of delay protection drive circuit of low voltage operating.
Background technology
In the prior art, general miniature circuit breaker has only the moving protection of overload long delay and short circuit wink, and the protection value, while that surpass subordinate's circuit breaker when the failed shorted electric current are when reaching the protection value of higher level's circuit breaker again; If higher level's circuit breaker does not have short circuit short time delay function, then can the superior and the subordinate trip simultaneously, perhaps can higher level's circuit breaker trip and subordinate's tripping; Cause the fault-free loop fault so easily; Make fault involve expanded range, especially in electric power system, if the miniature circuit breaker between the superior and the subordinate does not have short circuit short time delay function; Fault coverage is enlarged, cause unnecessary, bigger economic loss.
For satisfying the selectivity requirement of DC power system; The circuit breaker that need have short time delay protection, existing delay circuit adopt the mode of electric capacity charging time-delay more, and be very high to the state dependency degree of the supply voltage of circuit breaker; Environment for use receives severely restricts, is difficult to be suitable for.
Summary of the invention
The object of the present invention is to provide the delay protection drive circuit of the actively tangible low voltage operating of a kind of effect.
Reach other purposes in order to achieve the above object; The delay protection drive circuit of low voltage operating provided by the invention; Be used to protect the circuit to be protected with release, it comprises: be connected in the circuit to be protected and the sampling element of the said circuit voltage to be protected that is used to sample; The booster circuit that is connected and is used for the voltage of being sampled is boosted with said sampling element; The change-over circuit that is connected said booster circuit output and is used for the voltage of said booster circuit output is changed; Be connected with said sampling element and be used for said sampling element institute sampled voltage is carried out filter circuit for filtering; First comparison circuit that is connected with said filter circuit and change-over circuit respectively; Be connected the delay circuit of the said first comparison circuit output; And be connected with said delay circuit and said release connects and be used to drive the drive circuit of said release.
Further, said booster circuit adopts boost chip and peripheral circuit composition thereof, can the input voltage of minimum DC 0.6V be promoted to be+5V voltage.
Further, said first comparison circuit adopts comparator that input signal and set point are compared, and judges whether to arrive the protection value of setting, whether gets into the delay protection stage with decision.
Further, said delay circuit adopts the R-C delay circuit, accurately controls delay time.
Further, said drive circuit receives through the triggering signal after the R-C time-delay, drives electromagnetic release.
The present invention and existing technology contrast, and its effect is positive, tangible.Delay protection proper, anti-electromagnetic interference capability are strong.
Description of drawings
Fig. 1 is the basic framework sketch map of the delay protection drive circuit of low voltage operating of the present invention.
Fig. 2 is the embodiment sketch map of the delay protection drive circuit of the low voltage operating of invention.
Embodiment
See also Fig. 1 and Fig. 2, the delay protection drive circuit of low voltage operating of the present invention comprises: sampling element, booster circuit, change-over circuit, filter circuit, first comparison circuit, delay circuit, and drive circuit.
Said sampling element is connected in the circuit to be protected, and said circuit voltage to be protected is used to sample.In the present embodiment, it is a sampling resistor.
Said booster circuit is connected with said sampling element, is used for the voltage of being sampled is boosted.In the present embodiment, said booster circuit can be with the 0.6V boost in voltage to 5V.As shown in Figure 2, said booster circuit comprises the chip V2 that boosts, inductance L 1, capacitor C 1, C2, C3, C4, resistance R 3, R4 etc.Wherein, inductance L 1, capacitor C 1, C2, C3, C4, resistance R 3, R4 are according to the standard circuit principle connection of the chip V2 that boosts.
Said change-over circuit is connected said booster circuit output, is used for the voltage of said booster circuit output is carried out voltage transitions; It can comprise voltage stabilizing circuit and bleeder circuit.As shown in Figure 2, the voltage stabilizing circuit that resistance R 5 and voltage stabilizing didoe D3 form is connected the voltage output end of booster circuit, to produce a fiduciary level VC1 (DC3V) who is lower than booster circuit output; The bleeder circuit that resistance R 6, R7, R8, R9, R10, R11, R12 form is connected circuit output end of pressure-stabilizing, and C1 carries out dividing potential drop with the voltage stabilizing circuit output voltage V.
Said filter circuit is connected with said sampling element, is used for said sampling element institute sampled voltage is carried out filtering.As shown in Figure 2, power resistor R1, resistance R 13, and the filter circuit formed of capacitor C 6 voltage of sampling resistor sampling is carried out filtering.
Said first comparison circuit is connected with said filter circuit and change-over circuit respectively.As shown in Figure 2, the inverting input of the operational amplifier V1A of first comparison circuit connects bleeder circuit, promptly is connected the points of common connection of resistance R 6 and R7; The normal phase input end of operational amplifier V1A connects filter circuit, promptly connects resistance R 13.
Said delay circuit is connected the said first comparison circuit output.Delay circuit as shown in Figure 2, that resistance R 15, capacitor C 7 formed is connected the output of operational amplifier V1A.
Said drive circuit is connected the delay circuit output, and in the present embodiment, it comprises second comparison circuit and sub-drive circuit.
Said second comparison circuit is connected with said delay circuit and change-over circuit respectively.As shown in Figure 2, the normal phase input end of the operational amplifier V1B of said second comparison circuit connects delay circuit, promptly is connected the points of common connection A1 of resistance R 15 and capacitor C 7; The inverting input of operational amplifier V1B connects change-over circuit, promptly is connected the resistance R 5 of voltage stabilizing circuit and the points of common connection of voltage stabilizing didoe D3, to insert the fiduciary level VC1 (DC3V) of voltage stabilizing circuit output.
Said sub-drive circuit is connected with said second comparison circuit output and said release respectively, is used to drive said release.As shown in Figure 2, the output process of operational amplifier V1B is by resistance R 17, R18, and the filter circuit that capacitor C 9 is formed is connected on the drive end of the D12 of sub-drive circuit, and diode D13 protection tripping coil is not reversed voltage breakdown.
The operation principle of foregoing circuit is following:
When by the voltage of sampling element sampling during greater than DC0.6V, booster circuit is started working, and booster circuit promotes the input voltage of DC0.6V and is DC5V.DC5V is that integrated operational amplifier provides power supply and takes off a mouthful power supply for release provides.The voltage stabilizing circuit that DC5V forms through resistance R 5, voltage stabilizing didoe D3; The DC5V step-down is stabilized in DC3V, and DC3V produces the inverting input that a stable level inserts operational amplifier V1A through the bleeder circuit of being made up of resistance R 6, R7, R8, R9, R10, R11, R12.The signal of sampling element voltage passes through power resistor R1, resistance R 13, reaches the filter circuit that capacitor C 6 is formed; Insert the normal phase input end of operational amplifier V1A; When this signal when inserting level of this group operational amplifier inverting input, the output output high level of this operational amplifier V1A.The delay circuit of this high level through being made up of resistance R 15, capacitor C 7 realized delay requirement.The normal phase input end of another group operational amplifier of the output termination of delay circuit V1B; When this level is higher than DC3V; The output output high level of operational amplifier, the filter circuit of high level through forming, the conducting of driving N channel field-effect pipe by resistance R 17, R18, capacitor C 9.The FET conducting makes and is serially connected in the electromagnetic release action between DC5V and the zero level that tripping mechanism moves to the operating mechanism trip signal, and then makes the rapid cutting-off of short-circuit circuit of circuit breaker.
If between time delay, disappear by the level of sampling element input, the output of operational amplifier V1A disappears immediately, and time-delay stops, and tripping mechanism is failure to actuate, not disjunction of circuit breaker, thereby avoided the expansion of accident area.
In sum; The delay protection drive circuit of low voltage operating of the present invention utilizes booster circuit to make the detection delay unit when input DC0.6V, can start working, and adopts low-power electromagnetic actuator simultaneously, makes protective circuit need not pass through charging process; As long as short circuit current occurs; Can start, with the disengagement failure circuit, its delay protection proper, anti-electromagnetic interference capability are strong.
The foregoing description is just listed expressivity principle of the present invention and effect is described, but not is used to limit the present invention.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present invention and scope.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (7)
1. the delay protection drive circuit of a low voltage operating is used to protect the circuit to be protected with release, it is characterized in that comprising:
Be connected in the circuit to be protected and the sampling element of the said circuit voltage to be protected that is used to sample;
The booster circuit that is connected and is used for the voltage of being sampled is boosted with said sampling element;
The change-over circuit that is connected said booster circuit output and is used for the voltage of said booster circuit output is changed;
Be connected with said sampling element and be used for said sampling element institute sampled voltage is carried out filter circuit for filtering;
First comparison circuit that is connected with said filter circuit and change-over circuit respectively;
Be connected the delay circuit of the said first comparison circuit output;
Be connected with said delay circuit and said release connects and be used to drive the drive circuit of said release.
2. the delay protection drive circuit of low voltage operating as claimed in claim 1, it is characterized in that: said sampling element is a sampling resistor.
3. the delay protection drive circuit of low voltage operating as claimed in claim 1, it is characterized in that: said booster circuit comprises the chip that boosts.
4. like the delay protection drive circuit of claim 1 or 3 described low voltage operatings, it is characterized in that: said booster circuit is can be with the booster circuit of 0.6V boost in voltage to 5V.
5. the delay protection drive circuit of low voltage operating as claimed in claim 1 is characterized in that: said change-over circuit comprises voltage stabilizing circuit and the bleeder circuit that is connected with said voltage stabilizing circuit.
6. the delay protection drive circuit of low voltage operating as claimed in claim 1, it is characterized in that: said delay circuit is the RC delay circuit.
7. the delay protection drive circuit of low voltage operating as claimed in claim 1, it is characterized in that: said drive circuit comprises: second comparison circuit that is connected with said delay circuit and change-over circuit respectively and be connected the said second comparison circuit output and be used to drive the sub-drive circuit of release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010590095.9A CN102568940B (en) | 2010-12-15 | 2010-12-15 | The delay protection drive circuit of low voltage operating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010590095.9A CN102568940B (en) | 2010-12-15 | 2010-12-15 | The delay protection drive circuit of low voltage operating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102568940A true CN102568940A (en) | 2012-07-11 |
| CN102568940B CN102568940B (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010590095.9A Active CN102568940B (en) | 2010-12-15 | 2010-12-15 | The delay protection drive circuit of low voltage operating |
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| Country | Link |
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| CN (1) | CN102568940B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020078091A1 (en) * | 2018-10-15 | 2020-04-23 | 珠海格力电器股份有限公司 | Method for anti-electromagnetic interference and intelligent lock |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07161277A (en) * | 1993-12-06 | 1995-06-23 | Mitsubishi Electric Corp | Circuit breaker |
| CN2247384Y (en) * | 1995-12-29 | 1997-02-12 | 谢培义 | Single-phase power load control switch |
| CN101615778A (en) * | 2009-08-03 | 2009-12-30 | 浙江南电电气有限公司 | Intelligent electrical apparatus release |
-
2010
- 2010-12-15 CN CN201010590095.9A patent/CN102568940B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07161277A (en) * | 1993-12-06 | 1995-06-23 | Mitsubishi Electric Corp | Circuit breaker |
| CN2247384Y (en) * | 1995-12-29 | 1997-02-12 | 谢培义 | Single-phase power load control switch |
| CN101615778A (en) * | 2009-08-03 | 2009-12-30 | 浙江南电电气有限公司 | Intelligent electrical apparatus release |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020078091A1 (en) * | 2018-10-15 | 2020-04-23 | 珠海格力电器股份有限公司 | Method for anti-electromagnetic interference and intelligent lock |
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| Publication number | Publication date |
|---|---|
| CN102568940B (en) | 2016-01-27 |
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