CN201698967U - Driving circuit of improved magnetic latching relay of electric energy meter - Google Patents
Driving circuit of improved magnetic latching relay of electric energy meter Download PDFInfo
- Publication number
- CN201698967U CN201698967U CN2010202457004U CN201020245700U CN201698967U CN 201698967 U CN201698967 U CN 201698967U CN 2010202457004 U CN2010202457004 U CN 2010202457004U CN 201020245700 U CN201020245700 U CN 201020245700U CN 201698967 U CN201698967 U CN 201698967U
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- CN
- China
- Prior art keywords
- driving circuit
- magnetic latching
- latching relay
- electric energy
- energy meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a driving circuit of an improved magnetic latching relay of an electric energy meter, comprising switching triodes, a current-limiting resistor and a pull-down resistor, wherein a bridge type driving circuit is formed by the switching triodes; the current-limiting resistor is connected with the pull-down resistor in parallel and then is connected with base electrodes of the switching triodes; and a diode is connected between a collector electrode and an emitting electrode of each switching triode in parallel, so that reverse current flows through the diode. The driving circuit of the improved magnetic latching relay of the electric energy meter leads negative voltage caused by the action of a switch relay to be limited under 0.7V, thus avoiding the impact of the negative voltage on an MCU and a driving triode, and ensuring a circuit to reliably and stably work; furthermore, the driving circuit is simple in structure and low in cost.
Description
Technical field
The utility model relates to a kind of modified model drive circuit of magnetic latching relay that is used for electric energy meter.
Background technology
Along with having the extensive application of forfeiting electric work energy electronic electric energy meter, the fail safe and the reliability of table meter more and more are subject to people's attention, when relay switch moves in the table meter, because the electric current of opening is bigger, open and the moment that ends at triode, can produce the reverse voltage of higher amplitude, if this voltage is dealt with improperly, might cause the damage of switch triode and to the interference of MCU, and conventional processing mode is to use transient suppressor spare that this voltage is carried out the amplitude limit (see figure 2), but with finding after the oscilloscope inspection that this mode can not suppress this harmful voltage fully, and use the cost of transient suppressor relatively can be higher.
The utility model content
The purpose of this utility model is to provide a kind of reverse voltage of avoiding switch triode to be caused the modified model drive circuit of magnetic latching relay that damages and MCU is caused interference, electric energy meter with low cost.
The modified model drive circuit of magnetic latching relay of this electric energy meter that the utility model provides, comprise switch triode, current-limiting resistance, pull down resistor, wherein switch triode constitutes bridge drive circuit, connect the base stage of switch triode after current-limiting resistance and the pull down resistor parallel connection, a diode in parallel between the collector electrode of described each switch triode and the emitter makes reverse current flow through from diode.
The utility model is owing to diode of reverse parallel connection between the emitter and collector of switch triode, thereby the conducting voltage that the reverse voltage that makes relay tripping operation produce is clamped at diode has avoided excessive switch triode is caused of reverse voltage to damage and MCU is caused interference with interior, and the utility model modified model drive circuit of magnetic latching relay circuit is simple and with low cost.
Description of drawings
Fig. 1 is the utility model circuit diagram;
Fig. 2 is prior art circuits figure.
Embodiment
As can be seen from Figure 1, the modified model drive circuit of magnetic latching relay of the utility model electric energy meter comprises switch triode Q501～Q504, current-limiting resistance R501, R504, pull down resistor R507, R508, wherein switch triode Q501～Q504 constitutes bridge drive circuit, and Q503, Q504 is the NPN type, Q501, Q502 is a positive-negative-positive, current-limiting resistance R501, R504 respectively with pull down resistor R507, meet switch triode Q503 after the R508 parallel connection more respectively, the base stage of Q504, equal reverse parallel connection diode D501～D504 successively between the collector electrode of switch triode Q501～Q504 and emitter.Wherein HVC is this magnetic latching relay power supply, RELAYON, RELAYOFF are the signal input end of this drive circuit of magnetic latching relay, RYA, RYB connect the control pin of magnetic latching relay, current-limiting resistance is used for limiting the size that flows into the switch triode base current, pull down resistor prevents that switch triode is subjected to the influence of noise signal and produces misoperation, and it is more reliable that switch triode is ended.
The concrete working method of the utility model is as follows:
When magnetic latching relay needs closure by disconnection, make that magnetic latching relay control signal RELAYON is a high level, RELAYOFF is a low level, Q502, Q503 enters conducting state fast, Q501, Q504 goes into cut-off state when then quick, electric current is through HVC--＞Q502--＞RYB--＞RYA--＞Q503--＞GND, the relay power closure, in this journey, the spike that the relay tripping operation produces can produce a reverse voltage to GND, if do not process, this reverse voltage is too high when being added in the triode two ends, the safety of entail dangers to triode, and the work of CPU caused interference, but at switch triode Q502, the emitter and collector reverse parallel connection diode D502 of Q503, behind the D503, if the conducting voltage of this reverse voltage Xiao Yu diode, switch triode Q502 then, voltage between the emitter and collector of Q503 is that (silicone tube is 0.7V for the conducting voltage of diode, germanium tube is 0.3V), if this reverse voltage is greater than the conducting voltage of diode, diode current flow then, be added in Q502, voltage swing between the Q503 emitter and collector still is D502, the conducting voltage of D503, so D502, D503 can be clamped on 0.7V and following with this negative voltage size, thereby avoid negative pressure that MCU and driving triode are impacted, make the reliable and stable work of circuit.
When magnetic latching relay need be disconnected by closure, make that magnetic latching relay control signal RELAYON is a low level, RELAYOFF is a high level, Q501, Q504 enters conducting state fast, Q502, Q503 then enters cut-off state fast, electric current is through HVC--＞Q501--＞RYA--＞RYB--＞Q504--＞GND, relay power disconnects, the spike that produces in this process repeat circuit tripping operation can produce a negative voltage to GND equally, this moment clamping diode D501, D504 carries out clamp to this negative pressure, make that voltage swing is at 0.7V and following between switch triode emitter and the collector electrode, thereby avoid this negative voltage that MCU and driving triode are impacted, make the reliable and stable work of circuit.
Claims (1)
1. the modified model drive circuit of magnetic latching relay of an electric energy meter, comprise switch triode, current-limiting resistance, pull down resistor, wherein switch triode constitutes bridge drive circuit, connect the base stage of switch triode after current-limiting resistance and the pull down resistor parallel connection, a diode in parallel between the collector electrode that it is characterized in that described each switch triode and the emitter makes reverse current flow through from diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202457004U CN201698967U (en) | 2010-07-02 | 2010-07-02 | Driving circuit of improved magnetic latching relay of electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202457004U CN201698967U (en) | 2010-07-02 | 2010-07-02 | Driving circuit of improved magnetic latching relay of electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201698967U true CN201698967U (en) | 2011-01-05 |
Family
ID=43400213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202457004U Expired - Lifetime CN201698967U (en) | 2010-07-02 | 2010-07-02 | Driving circuit of improved magnetic latching relay of electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201698967U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664126A (en) * | 2012-05-17 | 2012-09-12 | 许继集团有限公司 | Driving circuit of magnetic latching relay |
| CN102664125A (en) * | 2012-05-17 | 2012-09-12 | 许继集团有限公司 | Double high driving level-resistant magnetic latching relay driving circuit |
| CN102830348A (en) * | 2012-08-21 | 2012-12-19 | 江苏华德电力科技有限公司 | Bounce testing device for single-coil magnetic-latching relay and test method of bounce testing device |
| CN102842902A (en) * | 2012-09-08 | 2012-12-26 | 无锡隆盛科技股份有限公司 | Oxygen pump protection circuit of nitrogen-oxygen sensor |
| CN103034132A (en) * | 2011-10-09 | 2013-04-10 | 重庆中科芯亿达电子有限公司 | Three-channel driving circuit |
| CN104835684A (en) * | 2015-04-14 | 2015-08-12 | 杭州西力电能表制造有限公司 | Relay control circuit capable of monitoring operating states of closing end and opening end of relay |
| CN108494235A (en) * | 2018-05-31 | 2018-09-04 | 蔺会强 | A kind of slide cam selector driving circuit |
| CN109412570A (en) * | 2018-11-26 | 2019-03-01 | 深圳和而泰智能控制股份有限公司 | A kind of switch driving circuit, controller and electronic equipment |
-
2010
- 2010-07-02 CN CN2010202457004U patent/CN201698967U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034132A (en) * | 2011-10-09 | 2013-04-10 | 重庆中科芯亿达电子有限公司 | Three-channel driving circuit |
| CN102664126A (en) * | 2012-05-17 | 2012-09-12 | 许继集团有限公司 | Driving circuit of magnetic latching relay |
| CN102664125A (en) * | 2012-05-17 | 2012-09-12 | 许继集团有限公司 | Double high driving level-resistant magnetic latching relay driving circuit |
| CN102664126B (en) * | 2012-05-17 | 2015-09-02 | 国家电网公司 | Drive circuit of magnetic latching relay |
| CN102830348A (en) * | 2012-08-21 | 2012-12-19 | 江苏华德电力科技有限公司 | Bounce testing device for single-coil magnetic-latching relay and test method of bounce testing device |
| CN102842902A (en) * | 2012-09-08 | 2012-12-26 | 无锡隆盛科技股份有限公司 | Oxygen pump protection circuit of nitrogen-oxygen sensor |
| CN102842902B (en) * | 2012-09-08 | 2016-05-18 | 无锡隆盛科技股份有限公司 | Nitrogen oxide sensor oxygen pump holding circuit |
| CN104835684A (en) * | 2015-04-14 | 2015-08-12 | 杭州西力电能表制造有限公司 | Relay control circuit capable of monitoring operating states of closing end and opening end of relay |
| CN104835684B (en) * | 2015-04-14 | 2017-01-11 | 杭州西力电能表制造有限公司 | Relay control circuit capable of monitoring operating states of closing end and opening end of relay |
| CN108494235A (en) * | 2018-05-31 | 2018-09-04 | 蔺会强 | A kind of slide cam selector driving circuit |
| CN109412570A (en) * | 2018-11-26 | 2019-03-01 | 深圳和而泰智能控制股份有限公司 | A kind of switch driving circuit, controller and electronic equipment |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110105 |