CN202406094U - Optical control switch circuit - Google Patents
Optical control switch circuit Download PDFInfo
- Publication number
- CN202406094U CN202406094U CN2012200004009U CN201220000400U CN202406094U CN 202406094 U CN202406094 U CN 202406094U CN 2012200004009 U CN2012200004009 U CN 2012200004009U CN 201220000400 U CN201220000400 U CN 201220000400U CN 202406094 U CN202406094 U CN 202406094U
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- resistance
- circuit
- npn transistor
- relay
- light
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Abstract
The utility model relates to an optical control switch circuit which consists of a 12V direct-current power supply, a light-sensing circuit, an optical signal one-stage amplifying circuit, a two-stage power amplifying and negative feedback circuit and a relay control and protection circuit. The optical control switch circuit uses only one light dependent resistor RG for collecting optical signals, then the optical signals are amplified in two stages by two NPN transistors, and finally the switch contact of a relay is driven. The optical control switch circuit can be used for automatic control circuits, security systems, counters or remote control circuits and the like and has the characteristics of high sensitivity, high optical control response speed, reliable operation and the like.
Description
Technical field
The utility model belongs to the electron controls technology field, relates to a kind of light-controlled switching circuit.
Background technology
The described light-controlled switching circuit of the utility model uses a photo resistance RG to gather light signal, and light signal carries out the two-stage amplification through 2 NPN transistors then, drives relay switch contacts at last.Light-controlled switching circuit can be used for circuit such as automatic control, safety-protection system, counter or Long-distance Control, and it has responsive high, characteristics such as light-operated response speed is fast, reliable operation.
Below specify this light-controlled switching circuit related correlation technique content in implementation process.
The utility model content
Goal of the invention and beneficial effect: the described light-controlled switching circuit of the utility model uses a photo resistance RG to gather light signal, and light signal carries out the two-stage amplification through 2 NPN transistors then, drives the switch contact of relay at last.This light-controlled switching circuit can be used for circuit such as automatic control, safety-protection system, counter or Long-distance Control, and it has responsive high, characteristics such as light-operated response speed is fast, reliable operation.
The circuit working principle: light-controlled switching circuit is to form a bleeder circuit at circuit input end with a photo resistance RG and trimmer potentiometer RP; When impinging upon, light cause its resistance value to diminish on the photo resistance RG; Thereby whole bleeder circuit voltage distribution is changed, and these change in voltage will controlled the conducting of NPN transistor VT1 or end; Potentiometer RP is used to adjust the sensitivity of photosensitive circuit, adjusts it and uses under the different illumination conditions being adapted to.The moment of switching diode D1 in order to protect NPN transistor VT2 to end, the inverse electromotive force that bypass direct current relay J coil produces.
Technical scheme: light-controlled switching circuit, to form by 12V DC power supply, photosensitive circuit, light signal one-level amplifying circuit, secondary power amplification and negative-feedback circuit, relay control and protective circuit, its characteristic comprises:
Photosensitive circuit: form by photo resistance RG, potentiometer RP and resistance R 1; The end of the terminating resistor R1 of the end of photo resistance RG and potentiometer RP; The anodal VCC of the other end connection circuit of photo resistance RG; The other end of potentiometer RP and lever arm thereof link to each other with circuit ground GND, the base stage of another termination NPN transistor VT1 of resistance R 1;
Light signal one-level amplifying circuit: form by NPN transistor VT1, resistance R 2, resistance R 3 and resistance R 4; The end of the collector electrode connecting resistance R2 of NPN transistor VT1 and an end of resistance R 4; The anodal VCC of the other end connection circuit of resistance R 2; The base stage of another termination NPN transistor VT2 of resistance R 4, the end of the emitter connecting resistance R3 of NPN transistor VT1, the other end connection circuit ground GND of resistance R 3;
Secondary power amplifies and negative-feedback circuit: be made up of NPN transistor VT2, resistance R 5 and resistance R 6; The end of the base stage connecting resistance R5 of NPN transistor VT2; The one termination circuit ground GND of the other end of resistance R 5 and resistance R 6; The other end of the emitter connecting resistance R6 of NPN transistor VT2, collector connecting relay control and the protective circuit of NPN transistor VT2.
Relay control and protective circuit: form by relay J and switching diode D1; One end of the collector connecting relay J coil of NPN transistor VT2 and the positive pole of switching diode D1, the anodal VCC of the negative pole connection circuit of the other end of relay J coil and switching diode D1.
The positive pole of 12V DC power supply links to each other with circuit anode VCC, and the negative pole of 12V DC power supply links to each other with circuit ground GND.
Description of drawings
Accompanying drawing 1 is the embodiment circuit working schematic diagram of light-controlled switching circuit; The positive pole of 12V DC power supply links to each other with circuit anode VCC in the accompanying drawing 1, and the negative pole of 12V DC power supply links to each other with circuit ground GND.
Embodiment
Circuit working schematic diagram and description of drawings according to light-controlled switching circuit shown in the accompanying drawing 1; And according to the annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the execution mode requires to implement to realize the utility model.
Components and parts are selected and technical parameter
VT1, VT2 are NPN transistor, and model is 2CS9013, require β >=150;
RG is photo resistance, can select model photo resistance such as MG45 for use;
Resistance is all selected the metal film of power 1/8W for use, and the resistance of resistance R 1 is 4.7K Ω; The resistance of resistance R 2, resistance R 3, resistance R 6 is 51 Ω; The resistance of resistance R 4 is 2.7K Ω; The resistance of resistance R 5 is 2.2K Ω; RP is a potentiometer, and its resistance is 82K Ω;
J is a relay, and direct voltage is 12V, and the contact of relay J is rated for power 250V/2A;
D1 is a switching diode, and model is 1N4148;
DC power supply voltage is 12V, requires the maximum output current >=60mA of 12V DC power supply, and the 12V DC power supply can be used 12V stabilized voltage power supply or 12V battery pack,
Circuit production main points and circuit debugging
Because photo resistance RG is very responsive to high temperature, thus careful especially rapidly when welding photo resistance RG, if weld time long being easy to because of the overheated photo resistance RG that damages; After components and parts welding in the entire circuit is accomplished, conscientiously check the welding quality of components and parts, guarantee that elements such as polar crystal pipe, diode are connected correctly with the 12V DC power supply;
Resistance in the middle of at first potentiometer RP being transferred to covers in photo resistance RG with the scraps of paper, and trimmer potentiometer RP then is up to the adhesive of the contact of the J that hears relay; When the scraps of paper were removed photo resistance RG and received illumination, the contact of relay J should discharge.If the adhesive of the contact of relay J or discharge nonconformingly, the careful resistance of trimmer potentiometer RP is till the operating state of relay J meets the requirements.
Claims (3)
1. a light-controlled switching circuit is made up of 12V DC power supply, photosensitive circuit, light signal one-level amplifying circuit, secondary power amplification and negative-feedback circuit, relay control and protective circuit, and its characteristic comprises:
Photosensitive circuit is made up of photo resistance RG, potentiometer RP and resistance R 1; The end of the terminating resistor R1 of the end of photo resistance RG and potentiometer RP; The anodal VCC of the other end connection circuit of photo resistance RG; The other end of potentiometer RP and lever arm thereof link to each other with circuit ground GND, the base stage of another termination NPN transistor VT1 of resistance R 1;
Light signal one-level amplifying circuit is made up of NPN transistor VT1, resistance R 2, resistance R 3 and resistance R 4; The end of the collector electrode connecting resistance R2 of NPN transistor VT1 and an end of resistance R 4; The anodal VCC of the other end connection circuit of resistance R 2; The base stage of another termination NPN transistor VT2 of resistance R 4, the end of the emitter connecting resistance R3 of NPN transistor VT1, the other end connection circuit ground GND of resistance R 3;
Secondary power amplifies and negative-feedback circuit is made up of NPN transistor VT2, resistance R 5 and resistance R 6; The end of the base stage connecting resistance R5 of NPN transistor VT2; The one termination circuit ground GND of the other end of resistance R 5 and resistance R 6; The other end of the emitter connecting resistance R6 of NPN transistor VT2, collector connecting relay control and the protective circuit of NPN transistor VT2.
2. light-controlled switching circuit according to claim 1; It is characterized in that: relay control and protective circuit are made up of relay J and switching diode D1; One end of the collector connecting relay J coil of NPN transistor VT2 and the positive pole of switching diode D1, the anodal VCC of the negative pole connection circuit of the other end of relay J coil and switching diode D1.
3. light-controlled switching circuit according to claim 1 is characterized in that: the positive pole of 12V DC power supply links to each other with circuit anode VCC, and the negative pole of 12V DC power supply links to each other with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200004009U CN202406094U (en) | 2012-01-02 | 2012-01-02 | Optical control switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200004009U CN202406094U (en) | 2012-01-02 | 2012-01-02 | Optical control switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202406094U true CN202406094U (en) | 2012-08-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200004009U Expired - Fee Related CN202406094U (en) | 2012-01-02 | 2012-01-02 | Optical control switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202406094U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522974A (en) * | 2012-01-02 | 2012-06-27 | 丁希庆 | Light-operated switching circuit |
| CN103233644A (en) * | 2013-04-01 | 2013-08-07 | 刘喆 | Induction-type automatic door control switch |
| CN103929165A (en) * | 2014-04-21 | 2014-07-16 | 吴圣铎 | LED flashlight light-operated switch |
| CN109116779A (en) * | 2018-08-27 | 2019-01-01 | 苏州矽典微智能科技有限公司 | A kind of automatic switch controller and method of electrical equipment |
| CN109347469A (en) * | 2018-10-11 | 2019-02-15 | 西安电子科技大学 | Light-controlled switching circuit based on crystal of molybdenum disulfide pipe |
-
2012
- 2012-01-02 CN CN2012200004009U patent/CN202406094U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522974A (en) * | 2012-01-02 | 2012-06-27 | 丁希庆 | Light-operated switching circuit |
| CN103233644A (en) * | 2013-04-01 | 2013-08-07 | 刘喆 | Induction-type automatic door control switch |
| CN103929165A (en) * | 2014-04-21 | 2014-07-16 | 吴圣铎 | LED flashlight light-operated switch |
| CN109116779A (en) * | 2018-08-27 | 2019-01-01 | 苏州矽典微智能科技有限公司 | A kind of automatic switch controller and method of electrical equipment |
| CN109347469A (en) * | 2018-10-11 | 2019-02-15 | 西安电子科技大学 | Light-controlled switching circuit based on crystal of molybdenum disulfide pipe |
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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: 20120829 Termination date: 20130102 |