CN102664126B - Drive circuit of magnetic latching relay - Google Patents
Drive circuit of magnetic latching relay Download PDFInfo
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- CN102664126B CN102664126B CN201210153667.6A CN201210153667A CN102664126B CN 102664126 B CN102664126 B CN 102664126B CN 201210153667 A CN201210153667 A CN 201210153667A CN 102664126 B CN102664126 B CN 102664126B
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- brachium pontis
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- latching relay
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- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 description 4
- 241001516584 Andrya Species 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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Abstract
The present invention relates to a kind of drive circuit of magnetic latching relay, each brachium pontis is also provided with one for controlling the control triode of the upper triode of this brachium pontis and the complementary conducting of lower triode, this control triode emitter-base bandgap grading connects the corresponding control end of place brachium pontis, the upper triode that collector electrode control connection is corresponding, base stage connects power supply by current-limiting resistance.Drive circuit of the present invention can normally work under height drive level, and when two high drive levels or two low drive level, RA, RB current potential is identical, can not produce action, nonpassage in circuit.So drive circuit of the present invention can not damage circuit when drive level nondeterministic statement.
Description
Technical field
The present invention relates to a kind of electric energy meter drive circuit of magnetic latching relay.
Background technology
Generally the power supply of master cpu circuit and drive circuit of magnetic latching relay is provided by same power supply, when CPU just powers on, various functions starts initialization, its I/O port level controlling drive circuit of magnetic latching relay will be in nondeterministic statement, and now drive circuit of magnetic latching relay has also powered on, switch triode has probably been caused to mislead damage drive circuit.
The Chinese patent document of ZL201020245700.4 discloses a kind of drive circuit of magnetic latching relay.As shown in Figure 1, RelayOn is high level, when RelayOff is low level, Q502, Q503 enters conducting state fast, Q501, Q504 then fast time enter cut-off state, electric current is through HVC--> Q502--> RYB--> RYA--> Q503--> GAD, and relay power closes.When magnetic latching relay by closed need to disconnect time, magnetic latching relay control signal RelayOn is made to be low level, RelayOff is high level, Q501, Q504 enters conducting state fast, and Q502, Q503 then enter cut-off state fast, electric current is through HVC--> Q501--> RYA--> RYB--> Q504--> GND, and relay power disconnects.
Foregoing circuit, if RelayOn, RelayOff are high level simultaneously, then four triode conductings simultaneously, the relay coil between RYB and RYA is shorted, and electric current directly flows through two triodes of the same side, and easy drive circuit damages.
Summary of the invention
The object of this invention is to provide a kind of drive circuit of magnetic latching relay, in order to solve when digital I/O port level nondeterministic statement, drive circuit can vitiable problem.
For achieving the above object, the solution of the present invention is: a kind of drive circuit of magnetic latching relay, described drive circuit comprises a bridge circuit, first of bridge circuit, the second two brachium pontis are symmetrical arranged, a upper triode of each brachium pontis and a lower triode are connected between power supply and ground, upper triode and the series connection point of lower triode of each brachium pontis are the tie point being respectively used to be connected magnetic latching relay coil two ends, the base stage of the lower triode of each brachium pontis connects two control ends of described drive circuit respectively, each brachium pontis is also provided with one for controlling the control triode (Q1 of the upper triode of this brachium pontis and the complementary conducting of lower triode, Q6), this control triode emitter-base bandgap grading connects the corresponding control end of place brachium pontis, the upper triode that collector electrode control connection is corresponding, base stage connects power supply by current-limiting resistance.
Described upper triode, lower triode are all parallel with backward diode.
Described each lower triode is equipped with the pull down resistor (R9, R10) be connected between emitter-base bandgap grading and base stage.
The upper triode of each brachium pontis is NPN type triode (Q2, Q4), the emitter-base bandgap grading of upper triode connects power supply, collector electrode connects lower triode, biasing resistor (R4, R5) is connected with between base stage and emitter-base bandgap grading, corresponding control triode is PNP triode (Q1, Q6), and the collector electrode controlling triode connects the base stage of described upper triode (Q2, Q4).
Drive circuit of the present invention, can normally work under height drive level, and when two high drive levels or two low drive level, RA, RB current potential is identical, can not produce action, nonpassage in circuit.So drive circuit of the present invention can not damage circuit when drive level nondeterministic statement.
Accompanying drawing explanation
Fig. 1 is a kind of drive circuit of prior art;
Fig. 2 is a kind of drive circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Drive circuit of the present invention comprises a bridge circuit, first of bridge circuit, the second two brachium pontis are symmetrical arranged, a upper triode of each brachium pontis and a lower triode are connected between power supply and ground, upper triode and the series connection point of lower triode of each brachium pontis are the tie point being respectively used to be connected magnetic latching relay coil two ends, the base stage of the lower triode of each brachium pontis connects two control ends of described drive circuit respectively, each brachium pontis is also provided with one for controlling the control triode of the upper triode of this brachium pontis and the complementary conducting of lower triode, this control triode emitter-base bandgap grading connects the corresponding control end of place brachium pontis, the upper triode that collector electrode control connection is corresponding, base stage connects power supply by current-limiting resistance.
If Fig. 1 is a kind of embodiment, the right side brachium pontis that the left side brachium pontis that two brachium pontis are respectively triode Q2, lower triode Q3 composition forms with upper triode Q4, lower triode Q5, corresponding control switch pipe is respectively Q1, Q6.Circuit also comprises current-limiting resistance R1 ~ R8, pull down resistor R9, R10, wherein Q2 ~ Q5 forms bridge circuit, and Q2, Q4 is PNP type triode, Q3, Q5 are NPN type triode, current-limiting resistance R3, R7 and pull down resistor R9, switch triode Q3 is connected to, the base stage of Q5 and the emitter of Q1, Q6 after R10 parallel connection.Between the collector and emitter of switch triode Q2 ~ Q5, reverse parallel connection one protects diode D1 ~ D4 successively.+ 12V is the power supply driving magnetic latching relay action, RA, RB are the pin connecting magnetic latching relay control end, RelayOn, RelayOff are the control signal input of master cpu, current-limiting resistance is used for limiting the size flowing through switch triode base current, pull down resistor prevents switch triode to be subject to noise impact and produces misoperation, makes switch triode action more reliable.Q1, Q6 and current-limiting resistance R1, R8 form level shifting circuit, Q2, Q4 are also in control I/O port control under.
Specific works mode of the present invention is as follows:
Under not operating state, when input control signal RelayOn, RelayOff are high level, switch triode Q3, Q5 conducting, Q1, Q6 turn off, by Q1, Q6, Q2, Q4 are also turned off, so the two ends control line of magnetic latching relay just and connect together and there is no pressure drop, thus can not action be produced.
Under not operating state, when input control signal RelayOn, RelayOff are low level, switch triode Q3, Q5 turn off, Q1, Q6 conducting, by Q1, Q6 by Q2, Q4 also conducting, so the two ends control line of magnetic latching relay just connects together with+12V power supply does not have pressure drop equally, can not produce action yet.
When magnetic latching relay needs closed; control signal input RelayOn is made to be high level; RelayOff is low level; Q3, Q4, Q6 enter conducting state; Q1, Q2, Q5 enter off state; electric current is through+12V-> Q4-> RB-> RA->Q3-> GND; magnetic latching relay energising is closed, and magnetic latching relay produces a negative voltage and bleeds off by protecting diode D1, D4 in the process.
When magnetic latching relay needs to disconnect; control signal input RelayOn is made to be low level; RelayOff is high level; Q3, Q4, Q6 enter off state; Q1, Q2, Q5 enter conducting state; electric current is through+12V-> Q2-> RA-> RB-> Q5-> GND; magnetic latching relay energising disconnects, and magnetic latching relay produces a negative voltage and bleeds off by protecting diode D2, D3 in the process.
In whole work process, by level shifting circuit, the switch triode of composition bridge drive circuit is all in controllable state, thus can the effectively two high level of inhibitory control input or two low level misoperation infringement.In addition, when in the switch triode Q2 ~ Q5 forming bridge drive circuit, certain switch triode damages, also the another one triode of homonymy can be turned off the impact preventing long big current his-and-hers watches meter power consumption, and do not have big current and flow through relay for a long time and cause damage, thus guarantee table meter normally, reliably works.
If switch triode Q2 or Q4 damages, the Q3 when control signal input is high level, Q5 is in on-state current and will flows according to+12V-> Q2-> RA->Q3-> GND or+12V-> Q4-> RB->Q5-> GND, the Q3 when control signal input is low level, Q5 is in off state and does not have big current generation, do not have electric current and flow through magnetic latching relay for a long time yet.
If switch triode Q3 or Q5 damages, the Q2 when control signal input is high level, Q4 is in off state, do not have big current to produce, the Q2 when control signal input is low level, Q4 is in on-state current and will flows according to+12V-> Q2-> RA->Q3-> GND or+12V-> Q4-> RB->Q5-> GND, do not have electric current and flow through magnetic latching relay for a long time.
Above embodiment is the unrestricted technical method of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: modify to the present invention or equivalent replacement, as selected triode-type, the PNP of NPN replaces, even switching tube replacing with other types etc., and do not depart from any modification or partial replacement of the spirit and scope of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (4)
1. the drive circuit of a magnetic latching relay, described drive circuit comprises a bridge circuit, first of bridge circuit, the second two brachium pontis are symmetrical arranged, a upper triode of each brachium pontis and a lower triode are connected between power supply and ground, upper triode and the series connection point of lower triode of each brachium pontis are the tie point being respectively used to be connected magnetic latching relay coil two ends, the base stage of the lower triode of each brachium pontis connects two control ends of described drive circuit respectively, it is characterized in that, each brachium pontis is also provided with one for controlling the control triode (Q1 of the upper triode of this brachium pontis and the complementary conducting of lower triode, Q6), this control triode emitter-base bandgap grading connects the corresponding control end of place brachium pontis, the base stage of the upper triode that collector electrode control connection is corresponding, base stage connects power supply by current-limiting resistance, control triode and current-limiting resistance composition level shifting circuit, upper triode is in control I/O port control under.
2. the drive circuit of magnetic latching relay according to claim 1, is characterized in that, described upper triode, lower triode are all parallel with backward diode.
3. the drive circuit of magnetic latching relay according to claim 1, is characterized in that, described each lower triode is equipped with the pull down resistor (R9, R10) be connected between emitter-base bandgap grading and base stage.
4. the drive circuit of magnetic latching relay according to claim 1, it is characterized in that, the upper triode of each brachium pontis is PNP type triode (Q2, Q4), the emitter-base bandgap grading of upper triode connects power supply, collector electrode connects lower triode, be connected with biasing resistor (R4, R5) between base stage and emitter-base bandgap grading, corresponding control triode is NPN triode (Q1, Q6), and the collector electrode controlling triode connects the base stage of described upper triode (Q2, Q4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210153667.6A CN102664126B (en) | 2012-05-17 | 2012-05-17 | Drive circuit of magnetic latching relay |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210153667.6A CN102664126B (en) | 2012-05-17 | 2012-05-17 | Drive circuit of magnetic latching relay |
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| Publication Number | Publication Date |
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| CN102664126A CN102664126A (en) | 2012-09-12 |
| CN102664126B true CN102664126B (en) | 2015-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210153667.6A Active CN102664126B (en) | 2012-05-17 | 2012-05-17 | Drive circuit of magnetic latching relay |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090140A (en) * | 2014-06-30 | 2014-10-08 | 惠州中城电子科技有限公司 | Double-relay control circuit for one-phase meter |
| CN109743051A (en) * | 2019-03-22 | 2019-05-10 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2582149Y (en) * | 2002-11-18 | 2003-10-22 | 哈尔滨玛德利智能电器有限公司 | Micropower induction switch |
| CN201698967U (en) * | 2010-07-02 | 2011-01-05 | 威胜集团有限公司 | Driving circuit of improved magnetic latching relay of electric energy meter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5750725A (en) * | 1980-09-11 | 1982-03-25 | Matsushita Electric Works Ltd | Latching relay driving circuit |
| JPS5750726A (en) * | 1980-09-11 | 1982-03-25 | Matsushita Electric Works Ltd | Latching relay driving circuit |
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2012
- 2012-05-17 CN CN201210153667.6A patent/CN102664126B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2582149Y (en) * | 2002-11-18 | 2003-10-22 | 哈尔滨玛德利智能电器有限公司 | Micropower induction switch |
| CN201698967U (en) * | 2010-07-02 | 2011-01-05 | 威胜集团有限公司 | Driving circuit of improved magnetic latching relay of electric energy meter |
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| CN102664126A (en) | 2012-09-12 |
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Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: XUJI GROUP CO., LTD. Effective date: 20141223 Owner name: XUJI GROUP CO., LTD. HENAN XUJI METER CO., LTD. ST Free format text: FORMER OWNER: HENAN XUJI METER CO., LTD. Effective date: 20141223 |
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Effective date of registration: 20141223 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Xuji Group Co., Ltd. Applicant after: Henan Xuji Instrument Co., Ltd. Applicant after: State Grid Tianjin Electric Power Company Address before: No. 1298 Xuchang City, Henan province 461000 XJ Avenue Applicant before: Xuji Group Co., Ltd. Applicant before: Henan Xuji Instrument Co., Ltd. |
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