CN201805594U - Control circuit for infrared lamp of vidicon - Google Patents
Control circuit for infrared lamp of vidicon Download PDFInfo
- Publication number
- CN201805594U CN201805594U CN2010205092312U CN201020509231U CN201805594U CN 201805594 U CN201805594 U CN 201805594U CN 2010205092312 U CN2010205092312 U CN 2010205092312U CN 201020509231 U CN201020509231 U CN 201020509231U CN 201805594 U CN201805594 U CN 201805594U
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- control circuit
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Abstract
The utility model discloses a control circuit for an infrared lamp of a vidicon, which comprises a power supply connecting piece J20 connected with a power supply, a diode D20 electrically connected with the power supply connecting piece J20, a light-operated switch circuit, an infrared lamp group controlled by the light-operated switch circuit, and a constant current control circuit. In the control circuit, the constant current control circuit is additionally arranged in the control circuit for the infrared lamp of the vidicon via adopting the measures like voltage stabilization and constant current, so as to enable the entire circuit to be stabilized in the designed voltage range, and the electric current passing the infrared lamp can be kept within a set value, so that the brightness stability of the infrared lamp is guaranteed, the heat quantity irradiated by the infrared lamp is under control, and the service life of the infrared lamp is effectively prolonged.
Description
Technical field
The utility model relates to a kind of video camera infrared lamp control circuit.
Background technology
In the video camera infrared lamp control circuit the earliest, the infrared lamp group directly connects power supply and does not also take any voltage protection measure, causes very easily burning out infrared lamp when supply voltage raises.In order to protect infrared lamp, generally adopt the overvoltage control mode to control infrared lamp plate at present, to reach the purpose of protection infrared lamp, when voltage does not surpass assigned voltage, infrared lamp energy operate as normal; When voltage surpassed assigned voltage, infrared lamp was quitting work under the pressure-controlled excessively.
In the video camera infrared lamp control circuit; though the mode that generally adopted pressure-controlled at present is with the protection infrared lamp; but when voltage does not surpass assigned voltage; rising along with voltage; electric current through infrared lamp is just big more; bring influence so both may for the brightness of infrared lamp, and also can influence the useful life of infrared lamp.
The utility model content
The technical problems to be solved in the utility model is in order to overcome technological deficiency recited above, a kind of video camera infrared lamp control circuit to be provided.
In order to solve technical problem recited above, the utility model is taked following technical scheme:
The utility model provides a kind of video camera infrared lamp control circuit, include the mains connection J20 that connects power supply, the diode D20 that electrically connects with mains connection J20, light-controlled switching circuit, by the infrared lamp lamp group of light-controlled switching circuit control, also include constant-current control circuit, described constant-current control circuit further includes the IC chip, and described IC chip has EN pin, IN pin, SW pin, BST pin, GND pin and FB pin; Mains connection connects the IN pin behind diode D20; The EN pin connects light-controlled switching circuit; The IN pin connects capacitor C 20 back ground connection; GND pin ground connection; Be connected with capacitor C 21 between SW pin and the BST pin; Ground connection behind the SW pin connection switching diode D21, SW pin connect inductance L 20 and capacitor C 22 back ground connection, and the SW pin is connected to the FB pin after connecting inductance L 20 and infrared lamp lamp group, also is connected with resistance 27 between infrared lamp lamp group and the FB pin.
Described constant-current control circuit also includes current sampling circuit, and described current sampling circuit is made up of parallel resistance, an end ground connection of parallel resistance, and the other end is connected to the FB pin through resistance 27.
Described light-controlled switching circuit further includes photo resistance CDS20 and triode Q20, mains connection J20 is connected the emitter of triode Q20 through diode D20, resistance 20, photo resistance CDS20 and resistance 22, mains connection J20 is connected the base stage of triode Q20 through diode D20 and resistance 20, the collector electrode of triode Q20 is through the IN pin of resistance R 21 connection IC chip U20, and the emitter of triode Q20 connects the EN pin of IC chip U20.
The utility model adopts the measure of voltage stabilizing and constant current, by in video camera infrared lamp control circuit, increasing constant-current control circuit, make entire circuit can be stabilized in the voltage range of design, and the electric current through infrared lamp can keep a set point, guaranteed the stable of infrared lamp brightness like this, control the caloric value of infrared lamp, prolonged the useful life of infrared lamp effectively.
Description of drawings
Fig. 1 is a video camera infrared lamp control circuit of taking overvoltage protection.
Fig. 2 is a video camera infrared lamp control circuit of taking constant current control.
Embodiment
See also Fig. 1, be original video camera infrared lamp control circuit of taking overvoltage protection.As shown in the figure, adopt one group of infrared lamp lamp group, infrared lamp lamp group includes infrared lamp LED10, infrared lamp LED11, infrared lamp LED12, infrared lamp LED13, infrared lamp LED14, the infrared lamp LED15 of series connection; Triode Q11 is the positive-negative-positive transistor, and triode Q10 and triode Q12 are negative-positive-negative transistor.Mains connection J10 connects power supply, and mains connection J10 connects the collector electrode of triode Q12 after diode D10, parallel resistance R13, R17, infrared lamp lamp group; Mains connection J10 is through diode D10, resistance R 14 backs connect the emitter of triode Q11, mains connection is through diode D10, resistance R 14 and voltage-stabiliser tube D11 (voltage conditions of voltage-stabiliser tube D11 is 5.6V) back ground connection, mains connection J10 is through diode D10, photo resistance CDS11 connects the base stage of triode Q11, mains connection J10 is through diode D10, resistance R 18, voltage-stabiliser tube D12 (voltage conditions of voltage-stabiliser tube D12 is 8.2V) back connects the base stage of triode Q11, the base stage of triode Q11 is ground connection after resistance R 12, the base stage of triode Q11 is through the collector electrode of resistance R 19 connection triode Q12, and the collector electrode of triode Q11 is connected to the base stage of triode Q12 through resistance R 15; The collector electrode of triode Q10 connects mains connection J10, its grounded emitter, and its base stage is through resistance R 11 ground connection, and its base stage connects the base stage of triode Q12 through resistance R 10, R15; The base stage of triode Q12 is ground connection after resistance R 16, its grounded emitter.
As Fig. 1, generally about 12 ± 2V, during daytime, the resistance of photo resistance CDS11 is little for default external power supply voltage, and base stage and the emitter of triode Q11 are high voltage, not conducting of triode Q11, and entire circuit is in off-state, and infrared lamp lamp group does not work; During evening, it is big that the resistance of photo resistance CDS11 becomes, and the base stage of triode Q11 is a low-voltage, and it launches very high voltage, triode Q11 conducting, and entire circuit is in conducting state, and infrared lamp lamp group is lighted; When the voltage of voltage-stabiliser tube D12 is lower than the voltage conditions of 8.2V, show the not overvoltage of external power supply voltage, not conducting of voltage-stabiliser tube D12, infrared lamp lamp group is lighted; When the voltage of voltage-stabiliser tube D12 is higher than the voltage of 8.2V, show the external power supply electric voltage over press, this moment, voltage-stabiliser tube D12 conducting made the base stage of triode Q11 be in high voltage, not conducting of triode Q11, entire circuit is in off-state, and infrared lamp lamp group does not work.
See also Fig. 2, as shown in the figure, be a kind of embodiment of the video camera infrared lamp control circuit of taking constant current control.Video camera infrared lamp control circuit includes the mains connection J20 that connects power supply, diode D20 with mains connection J20 electric connection, light-controlled switching circuit 1, infrared lamp lamp group by light-controlled switching circuit 1 control (adopts one group of infrared lamp lamp group, infrared lamp lamp group includes the infrared lamp LED20 of series connection, infrared lamp LED21, infrared lamp LED22, infrared lamp LED23, infrared lamp LED24, infrared lamp LED25), also include constant-current control circuit 2, described constant-current control circuit 2 further includes IC chip U20, described IC chip U20 is the MP2370 chip that U.S. core origin system Co., Ltd (being called for short MPS company) provides, the acceptable voltage range of MP2370 chip is 6～23V, and it has controller input (EN pin), power input (IN pin), signal/data output end (SW pin), leading end (BST pin), earth terminal (GND pin) and circuit feedback end (FB pin).Mains connection connects the IN pin through diode D20; The EN pin connects light-controlled switching circuit; The IN pin connects capacitor C 20 back ground connection; GND pin ground connection; Be connected with capacitor C 21 between SW pin and the BST pin; Ground connection behind the SW pin connection switching diode D21, SW pin connect inductance L 20 and capacitor C 22 back ground connection, and the SW pin is connected to the FB pin after connecting inductance L 20 and infrared lamp lamp group, also is connected with resistance 27 between infrared lamp lamp group and the FB pin.Constant-current control circuit also includes current sampling circuit 3, and described current sampling circuit 3 is made up of parallel resistance R23, R24, R25, R26, an end ground connection of parallel resistance, and the other end is connected to the FB pin through resistance 27.Light-controlled switching circuit 1 further includes photo resistance CDS20 and triode Q20, triode Q20 is a negative-positive-negative transistor, mains connection J20 is connected the emitter of triode Q20 through diode D20, resistance 20, photo resistance CDS20 and resistance 22, mains connection J20 is connected the base stage of triode Q20 through diode D20 and resistance 20, the collector electrode of triode Q20 is through the IN pin of resistance R 21 connection IC chip U20, and the emitter of triode Q20 connects the EN pin of IC chip U20.
In the foregoing description, infrared lamp lamp group adopts one group, also can be according to actual needs, and the infrared lamp lamp group of many groups in parallel.
As Fig. 2, mains connection is 20 connection external power sources, outer power voltage is generally about 12 ± 2V, during daytime, the resistance of photo resistance CDS20 is little, and the base potential of triode Q20 is lower than the emitter current potential and is lower than emitter current potential+0.7V, not conducting of triode Q20, entire circuit is in off-state, and infrared lamp lamp group does not work; During evening, the resistance of photosensitive electric Q20 resistance becomes big, and the base potential of triode Q20 becomes and is higher than the emitter current potential and is higher than emitter current potential+0.7V, triode Q20 conducting, and entire circuit is in conducting state, and infrared lamp lamp group is lighted; When the magnitude of voltage of external power source IC chip U20 accept in the range of voltage values time, the numerical value that constant-current control circuit is being stipulated its operating voltage, current constant, both enlarged the scope of the operating voltage of entire circuit, also guaranteed the stable of infrared lamp brightness, control the caloric value of infrared lamp effectively, guarantee the useful life of infrared lamp.
Claims (3)
1. video camera infrared lamp control circuit, include the mains connection J20 that connects power supply, the diode D20 that electrically connects with mains connection J20, light-controlled switching circuit (1), by the infrared lamp lamp group of light-controlled switching circuit (1) control, it is characterized in that: also include constant-current control circuit (2), described constant-current control circuit (2) further includes IC chip U20, and described IC chip U20 has EN pin, IN pin, SW pin, BST pin, GND pin and FB pin; Mains connection connects the IN pin behind diode D20; The EN pin connects light-controlled switching circuit; The IN pin connects capacitor C 20 back ground connection; GND pin ground connection; Be connected with capacitor C 21 between SW pin and the BST pin; Ground connection behind the SW pin connection switching diode D21, SW pin connect inductance L 20 and capacitor C 22 back ground connection, and the SW pin is connected to the FB pin after connecting inductance L 20 and infrared lamp lamp group, also is connected with resistance 27 between infrared lamp lamp group and the FB pin.
2. video camera infrared lamp control circuit as claimed in claim 1, it is characterized in that: described constant-current control circuit also includes current sampling circuit (3), described current sampling circuit (3) is made up of parallel resistance, an end ground connection of parallel resistance, and the other end is connected to the FB pin through resistance 27.
3. video camera infrared lamp control circuit as claimed in claim 1 or 2, it is characterized in that: described light-controlled switching circuit (1) further includes photo resistance CDS20 and triode Q20, mains connection J20 is connected the emitter of triode Q20 through diode D20, resistance 20, photo resistance CDS20 and resistance 22, mains connection J20 is connected the base stage of triode Q20 through diode D20 and resistance 20, the collector electrode of triode Q20 is through the IN pin of resistance R 21 connection IC chip U20, and the emitter of triode Q20 connects the EN pin of IC chip U20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205092312U CN201805594U (en) | 2010-08-27 | 2010-08-27 | Control circuit for infrared lamp of vidicon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205092312U CN201805594U (en) | 2010-08-27 | 2010-08-27 | Control circuit for infrared lamp of vidicon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201805594U true CN201805594U (en) | 2011-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205092312U Expired - Fee Related CN201805594U (en) | 2010-08-27 | 2010-08-27 | Control circuit for infrared lamp of vidicon |
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| Country | Link |
|---|---|
| CN (1) | CN201805594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183607A (en) * | 2018-02-11 | 2018-06-19 | 浙江亿邦信息技术有限公司 | A kind of power control circuit and application |
-
2010
- 2010-08-27 CN CN2010205092312U patent/CN201805594U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183607A (en) * | 2018-02-11 | 2018-06-19 | 浙江亿邦信息技术有限公司 | A kind of power control circuit and application |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20140827 |
|
| EXPY | Termination of patent right or utility model |