CN203882882U - External relay drive circuit - Google Patents
External relay drive circuit Download PDFInfo
- Publication number
- CN203882882U CN203882882U CN201420090446.3U CN201420090446U CN203882882U CN 203882882 U CN203882882 U CN 203882882U CN 201420090446 U CN201420090446 U CN 201420090446U CN 203882882 U CN203882882 U CN 203882882U
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- CN
- China
- Prior art keywords
- capacitor
- triode
- drive circuit
- resistance
- relay drive
- 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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- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000010586 diagram Methods 0.000 description 1
Abstract
The utility model discloses an external relay drive circuit including resistors R1, R2 and R3, a triode Q1, a rectifier diode VD1 and capacitors C1 and C2. One end of the resistor R1 is connected to one end of the resistor R2, one end of the capacitor C1 and a b pole of the triode Q1; the other end of the resistor R2, the other end of the capacitor C1 and an e pole of the triode Q1 are connected to a common ground end; a c pole of the triode Q1 is connected to the anode of the diode VD1, and the cathode of the diode VD1 is connected to one end of the resistor R3; the other end of the resistor R3 is connected to one end of the capacitor C2 and a common power supply VDD; and the other end of the capacitor C2 is connected to the common ground end. The above external relay drive circuit is high in operating reliability.
Description
Technical field
The utility model relates to a kind of drive circuit, is specifically a kind of external relay drive circuit.
Background technology
The external relay drive circuit of prior art is comprised of resistance, triode and electric capacity.The external relay drive circuit of this structure is when the short circuit of relay input end grounding and output termination high level, and electric current can be through relay back discharge, thereby damages relay.Therefore, from above description, can find out, the functional reliability of prior art external relay drive circuit is poor.
Utility model content
The technical problems to be solved in the utility model is that the external relay drive circuit that a kind of functional reliability is high is provided.
The technical solution of the utility model is, a kind of external relay drive circuit is provided, and comprises resistance R 1, R2, R3, triode Q1, rectifier diode VD1 and capacitor C 1, C2; One end of described resistance R 1 is connected with one end of resistance R 2, the b utmost point of one end of capacitor C 1, triode Q1; The e of the other end of the other end of described resistance R 2, capacitor C 1, triode Q1 is extremely all connected with common ground end; The c utmost point of described triode Q1 and the anodic bonding of diode VD1, the negative electrode of described diode VD1 is connected with one end of resistance R 3; The other end of described resistance R 3 is connected with one end, the public power VDD of capacitor C 2; The other end of described capacitor C 2 is connected with common ground end.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
The utility model external relay drive circuit, when the short circuit of relay input end grounding and output termination high level, can prevent that electric current can be through relay back discharge by diode, thereby guarantee the normal use of relay; Capacitor C 2 can be removed the high-frequency interferencing signal on power supply in addition; Capacitor C 1 can be removed the high-frequency interferencing signal on control signal wire.Therefore from above description, can find out, the functional reliability of the utility model external relay drive circuit is higher.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model external relay drive circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of external relay drive circuit of the utility model, comprises resistance R 1, R2, R3, triode Q1, rectifier diode VD1 and capacitor C 1, C2; One end of described resistance R 1 is connected with one end of resistance R 2, the b utmost point of one end of capacitor C 1, triode Q1; The other end of resistance R 1 is as control signal input port; The e of the other end of the other end of described resistance R 2, capacitor C 1, triode Q1 is extremely all connected with common ground end; The c utmost point of described triode Q1 and the anodic bonding of diode VD1, the negative electrode of described diode VD1 is connected with one end of resistance R 3; The other end of described resistance R 3 is connected with one end, the public power VDD of capacitor C 2; The other end of described capacitor C 2 is connected with common ground end.The anode of diode VD1 and negative electrode are connected with the two ends of the coil of relay respectively.
Below only with regard to most preferred embodiment of the present utility model, be described, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various variations of doing in the protection range of the utility model independent claims are all in protection range of the present utility model.
Claims (1)
1. an external relay drive circuit, is characterized in that: comprise resistance R 1, R2, R3, triode Q1, rectifier diode VD1 and capacitor C 1, C2; One end of described resistance R 1 is connected with one end of resistance R 2, the b utmost point of one end of capacitor C 1, triode Q1; The e of the other end of the other end of described resistance R 2, capacitor C 1, triode Q1 is extremely all connected with common ground end; The c utmost point of described triode Q1 and the anodic bonding of diode VD1, the negative electrode of described diode VD1 is connected with one end of resistance R 3; The other end of described resistance R 3 is connected with one end, the public power VDD of capacitor C 2; The other end of described capacitor C 2 is connected with common ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090446.3U CN203882882U (en) | 2014-02-28 | 2014-02-28 | External relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090446.3U CN203882882U (en) | 2014-02-28 | 2014-02-28 | External relay drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203882882U true CN203882882U (en) | 2014-10-15 |
Family
ID=51683356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420090446.3U Expired - Lifetime CN203882882U (en) | 2014-02-28 | 2014-02-28 | External relay drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203882882U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107103723A (en) * | 2017-05-05 | 2017-08-29 | 苏州爱微礼网络科技有限公司 | Intelligent household security system |
| CN107248479A (en) * | 2016-12-13 | 2017-10-13 | 浙江恒业电子有限公司 | Relay driving and detection circuit for intelligent electric energy meter |
-
2014
- 2014-02-28 CN CN201420090446.3U patent/CN203882882U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107248479A (en) * | 2016-12-13 | 2017-10-13 | 浙江恒业电子有限公司 | Relay driving and detection circuit for intelligent electric energy meter |
| CN107248479B (en) * | 2016-12-13 | 2020-12-22 | 浙江恒业电子有限公司 | Relay driving and detecting circuit for intelligent electric energy meter |
| CN107103723A (en) * | 2017-05-05 | 2017-08-29 | 苏州爱微礼网络科技有限公司 | Intelligent household security system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL & ELECTRIC Co.,Ltd. Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: NINGBO SANXING ELECTRIC Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141015 |