CN203490311U - Two-stage filter detection circuit - Google Patents
Two-stage filter detection circuit Download PDFInfo
- Publication number
- CN203490311U CN203490311U CN201320606859.8U CN201320606859U CN203490311U CN 203490311 U CN203490311 U CN 203490311U CN 201320606859 U CN201320606859 U CN 201320606859U CN 203490311 U CN203490311 U CN 203490311U
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- secondary filter
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Abstract
The utility model relates to a two-stage filter detection circuit composed of a DC regulated power supply circuit and a detection circuit. The DC regulated power supply circuit is formed by sequent connection of a buck circuit, a filter circuit, a two-stage filter circuit and a voltage regulator circuit, and used for supplying a 3V DC voltage. The structure of the detection circuit is that a key switch S1 is connected with a positive electrode of a DC voltage output by the DC regulated power supply circuit, one path of the key switch S1 is serially connected with a key switch S2, an adjustable resistor Rp, a resistor R1 and then connected with a binding post A, the other path of the key switch S1 is serially connected with a resistor R2 and then connected with a binding post B, a binding post C is grounded, and a binding post D is serially connected with a light emitting diode LED and then grounded. The two-stage filter detection circuit is simple in structure, convenient to use, and rapid and accurate in detection.
Description
Technical field
The utility model relates to field tests, particularly secondary filter testing circuit.
Background technology
Photoelectrical coupler is as circuit isolating device, plays signal isolation, coupled transfer effect is widely used in each field of the commercial production such as household electrical appliance, frequency converter.When if the electronic equipment of having applied photoelectrical coupler above-mentioned breaks down, tester is in failure diagnostic process, usually need to judge the quality of photoelectrical coupler, common method is to utilize two multimeter tests, a multimeter is measured photoelectrical coupler input end with R*1, another multimeter is measured photoelectric coupler output end with R*100, when input end conducting, the pointer of output terminal multimeter has swing, judge that photoelectrical coupler is normal, this test mode is inaccurate, and easily erroneous judgement, affects testing efficiency.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of simple in structure and secondary filter testing circuit fast.
The utility model adopts following technical scheme: DC-stabilized circuit and testing circuit, consist of, described DC-stabilized circuit is connected to form successively by reduction voltage circuit, rectification circuit, secondary filter circuit, mu balanced circuit, provides and stablizes 3V DC voltage; Described reduction voltage circuit utilizes transformer T1 by 220V alternating voltage step-down output 6V voltage, described rectification circuit is the rectifier bridge that four diodes form, described secondary filter circuit forms one-level filtering by capacitor C 1 shunt capacitance C2 respectively, and capacitor C 3 shunt capacitance C4 form secondary filter; Described mu balanced circuit is by resistance R 3, diode U1, and triode Q1, resistance R 4 and resistance R 5 form; Described testing circuit comprises: after the DC voltage electrode that keyswitch S1 exports with described DC-stabilized circuit is connected, keyswitch S1Yi road is connected with binding post A with after keyswitch S2, adjustable resistance Rp, resistance R 1 series connection, another road of keyswitch S1 is connected with binding post B with after resistance R 2 series connection, binding post C ground connection, post D connect with LED after ground connection.
Further, described adjustable resistance Rp is 220 Ω adjustable resistances, and resistance R 1 is 220 Ω resistance, and resistance R 2 is 330 Ω resistance.
Positive technique effect of the present utility model: the utility model is simple in structure, easy to use.After single channel photoelectrical coupler pin to be measured and binding post A, binding post B, binding post C, post D are connected, adjust adjustable resistance Rp resistance, according to LED, brightness changes to judge that whether photoelectrical coupler normal, test rapidly, accurately.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit theory diagrams of DC-stabilized circuit in the utility model.
Accompanying drawing 2 is for detecting the circuit theory diagrams of testing circuit in the utility model.
Embodiment
As shown in accompanying drawing 1 and Fig. 2, the utility model is comprised of DC-stabilized circuit and testing circuit, and DC-stabilized circuit is connected to form successively by reduction voltage circuit, rectification circuit, secondary filter circuit, mu balanced circuit, provides and stablizes 3V DC voltage; Described reduction voltage circuit utilizes transformer T1 by 220V alternating voltage step-down output 6V voltage, and rectification circuit is that four diodes are the rectifier bridge that diode D1, D2, D3, D4 form, and utilizes the unilateal conduction characteristic of diode to obtain pulsating direct current through overcommutation.Secondary filter circuit forms one-level filtering by capacitor C 1 shunt capacitance C2 respectively, capacitor C 3 shunt capacitance C4 form secondary filter, secondary filter is all to utilize logical friendship of electric capacity to hinder directly, logical high frequency hinders the character of low frequency, by the alternating component filtering of passing through in the steady direct current of rectifier bridge, thereby obtain smoother DC voltage; Mu balanced circuit is by resistance R 3, diode U1, and triode Q1, resistance R 4 and resistance R 5 form, and realize the 3V DC voltage stability of output, and the variation with ac grid voltage and load does not change.
Testing circuit comprises: after the 3V DC voltage electrode that keyswitch S1 exports with described DC-stabilized circuit is connected, keyswitch S1Yi road is connected with binding post A with after keyswitch S2, adjustable resistance Rp, resistance R 1 series connection, another road of keyswitch S1 is connected with binding post B with after resistance R 2 series connection, binding post C ground connection, post D connect with LED after ground connection.In preferred embodiment, adjustable resistance Rp is 220 Ω adjustable resistances, and resistance R 1 is 220 Ω resistance, and resistance R 2 is 330 Ω resistance.
When reality is tested, the anode of single channel photoelectrical coupler to be measured, collector, negative electrode, emitter are connected with binding post A, binding post B, binding post C, post D respectively, then the switch S 1 that pushes button, power connection, LED does not work, after the switch S that pushes button 2, if LED is lighted, and while adjusting adjustable resistance Rp resistance value, the luminous intensity of LED can change, illustrate that photoelectrical coupler is normal, vice versa.
Claims (2)
1. secondary filter testing circuit, it is characterized in that: by DC-stabilized circuit and testing circuit, formed, described DC-stabilized circuit is connected to form successively by reduction voltage circuit, rectification circuit, secondary filter circuit, mu balanced circuit, provides and stablizes 3V DC voltage; Described reduction voltage circuit utilizes transformer (T1) by 220V alternating voltage step-down output 6V voltage, described rectification circuit is the rectifier bridge that four diodes form, described secondary filter circuit forms one-level filtering by capacitor C 1 shunt capacitance C2 respectively, and capacitor C 3 shunt capacitance C4 form secondary filter; Described mu balanced circuit is by resistance R 3, diode (U1), and triode (Q1), resistance R 4 and resistance R 5 form; Described testing circuit comprises: after the DC voltage electrode that keyswitch S1 exports with described DC-stabilized circuit is connected, keyswitch S1Yi road is connected with binding post A with after keyswitch S2, adjustable resistance (Rp), resistance R 1 series connection, another road of keyswitch S1 is connected with binding post B with after resistance R 2 series connection, binding post C ground connection, post D connect with light emitting diode (LED) after ground connection.
2. secondary filter testing circuit according to claim 1, is characterized in that described adjustable resistance (Rp) is 220 Ω adjustable resistances, and resistance R 1 is 220 Ω resistance, and resistance R 2 is 330 Ω resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320606859.8U CN203490311U (en) | 2013-09-29 | 2013-09-29 | Two-stage filter detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320606859.8U CN203490311U (en) | 2013-09-29 | 2013-09-29 | Two-stage filter detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203490311U true CN203490311U (en) | 2014-03-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320606859.8U Expired - Fee Related CN203490311U (en) | 2013-09-29 | 2013-09-29 | Two-stage filter detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203490311U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405557A (en) * | 2014-12-05 | 2015-03-11 | 重庆瑜欣平瑞电子有限公司 | Ignition monitoring circuit structure of general gasoline engine igniter |
-
2013
- 2013-09-29 CN CN201320606859.8U patent/CN203490311U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405557A (en) * | 2014-12-05 | 2015-03-11 | 重庆瑜欣平瑞电子有限公司 | Ignition monitoring circuit structure of general gasoline engine igniter |
| CN104405557B (en) * | 2014-12-05 | 2017-02-22 | 重庆瑜欣平瑞电子有限公司 | Ignition monitoring circuit structure of general gasoline engine igniter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20180929 |