CN201514441U - Current zero-crossing detection current circuit - Google Patents
Current zero-crossing detection current circuit Download PDFInfo
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- CN201514441U CN201514441U CN2009201704923U CN200920170492U CN201514441U CN 201514441 U CN201514441 U CN 201514441U CN 2009201704923 U CN2009201704923 U CN 2009201704923U CN 200920170492 U CN200920170492 U CN 200920170492U CN 201514441 U CN201514441 U CN 201514441U
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Abstract
The utility model relates to the technical field of control circuits, in particular to a current zero-crossing detection current circuit, which comprises a current zero-crossing detection current circuit, wherein a detection port is sequentially connected with a triode and an opto-coupler chip, the output end of the opto-coupler chip is connected with the input end of a field effect module, the output end of the filed effect module is connected with the input end of an amplifying circuit module, and the output end of the amplifying circuit module is connected with the input end of a detection unit. The structural design is simple and scientific, and the precision of the detection current is high.
Description
Technical field:
The utility model relates to the control circuit technical field, refers in particular to current zero-crossing point and detects current circuit.
Background technology:
At present in the ac zero-crossing point testing circuit, using more is that voltage over zero detects.For resistive load, voltage over zero and current zero-crossing point are synchronous, and in side circuit, pure resistive load is non-existent, and therefore, always there are phase differential in voltage over zero and current zero-crossing point.This phase differential increases along with the increase of load inductance amount, will have influence on the operate as normal of circuit when increasing to a certain degree.In all loads, inductive load occupies most ratios, so, detect current zero-crossing point and just have real practical significance.
The utility model content:
The purpose of this utility model is at the deficiencies in the prior art, and provides current zero-crossing point to detect current circuit, the simple science of its structural design, the precision height of detection electric current.
Realize above-mentioned purpose, the utility model adopts following technical scheme, it comprises that current zero-crossing point detects current circuit, detection port connects triode, opto-coupler chip successively, the output terminal of opto-coupler chip connects the input end of field effect module, field effect module output terminal connects the input end of amplifying circuit module, the input end of the output terminal joint detection unit of amplifying circuit module.
Described field effect module is made of electric capacity, resistance, electric-controlled switch.
Described amplifying circuit module triode, voltage stabilizing diode, resistance are interconnected to constitute.
Described detecting unit is made of the diode and the parallel resistor of two reverse parallel connections.
The utility model beneficial effect is: field effect module output terminal connects the input end of amplifying circuit module, the input end of the output terminal joint detection unit of amplifying circuit module, electric current by diode can be very faint, is minimal to 0.2mA, maximum maximum rated current to diode.In this scope, detected waveform is the square wave of standard, helps the later stage Signal Processing.
Description of drawings:
Fig. 1 is circuit theory diagrams of the present utility model;
Embodiment:
See shown in Figure 1: the utility model comprises that current zero-crossing point detects current circuit, detection port 8 connects triode 6, opto-coupler chip 7 successively, the output terminal of opto-coupler chip 7 connects the input end of field effect module 300, field effect module 300 output terminals connect the input end of amplifying circuit module 200, the input end of the output terminal joint detection unit 100 of amplifying circuit module 200.
Described field effect module 300 is made of electric capacity, resistance, electric-controlled switch.
Described amplifying circuit module 200 triodes 3, voltage stabilizing diode 4, resistance 5 are interconnected to constitute.
Described detecting unit 100 is made of the diode 1 and the parallel resistor 2 of two reverse parallel connections.
The utility model principle of work is as follows: after signal enters detection port 8, pass through triode 6, opto-coupler chip 7 successively, opto-coupler chip 7 is then through field effect module 300, amplifying circuit module 200, detecting unit 100.
Electric current by the diode in the detecting unit 100 1 can be very faint, is minimal to 0.2mA, maximum maximum rated current to diode.In this scope, detected waveform is the square wave of standard, helps the later stage Signal Processing.
The above only is preferred embodiment of the present utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.
Claims (4)
1. current zero-crossing point detects current circuit, it is characterized in that: detection port (8) connects triode (6), opto-coupler chip (7) successively, the output terminal of opto-coupler chip (7) connects the input end of field effect module (300), field effect module (300) output terminal connects the input end of amplifying circuit module (200), the input end of the output terminal joint detection unit (100) of amplifying circuit module (200).
2. current zero-crossing point according to claim 1 detects current circuit, and it is characterized in that: described field effect module (300) is made of electric capacity, resistance, electric-controlled switch.
3. current zero-crossing point according to claim 1 detects current circuit, and it is characterized in that: described amplifying circuit module (200) triode (3), voltage stabilizing diode (4), resistance (5) are interconnected to constitute.
4. current zero-crossing point according to claim 1 detects current circuit, it is characterized in that: described detecting unit (100) is made of the diode (1) and the parallel resistor (2) of two reverse parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201704923U CN201514441U (en) | 2009-08-06 | 2009-08-06 | Current zero-crossing detection current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201704923U CN201514441U (en) | 2009-08-06 | 2009-08-06 | Current zero-crossing detection current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201514441U true CN201514441U (en) | 2010-06-23 |
Family
ID=42485854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201704923U Expired - Fee Related CN201514441U (en) | 2009-08-06 | 2009-08-06 | Current zero-crossing detection current circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201514441U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243263A (en) * | 2011-04-08 | 2011-11-16 | 苏州路之遥科技股份有限公司 | Alternating current value detection and current zero crossing point detection circuit |
| CN102385000A (en) * | 2010-08-27 | 2012-03-21 | 深圳长城开发科技股份有限公司 | Zero crossing detection circuit of electric meter system |
| CN104237616A (en) * | 2014-09-22 | 2014-12-24 | 深圳市安邦信电子有限公司 | Voltage and current zero crossing point detection circuit of motor |
-
2009
- 2009-08-06 CN CN2009201704923U patent/CN201514441U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385000A (en) * | 2010-08-27 | 2012-03-21 | 深圳长城开发科技股份有限公司 | Zero crossing detection circuit of electric meter system |
| CN102385000B (en) * | 2010-08-27 | 2015-07-01 | 深圳长城开发科技股份有限公司 | Zero crossing detection circuit of electric meter system |
| CN102243263A (en) * | 2011-04-08 | 2011-11-16 | 苏州路之遥科技股份有限公司 | Alternating current value detection and current zero crossing point detection circuit |
| CN102243263B (en) * | 2011-04-08 | 2015-05-13 | 苏州路之遥科技股份有限公司 | Alternating current value detection and current zero crossing point detection circuit |
| CN104237616A (en) * | 2014-09-22 | 2014-12-24 | 深圳市安邦信电子有限公司 | Voltage and current zero crossing point detection circuit of motor |
| CN104237616B (en) * | 2014-09-22 | 2017-11-17 | 深圳市安邦信电子有限公司 | Electric moter voltage current zero-crossing point detects circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100623 Termination date: 20110806 |