CN102548095B - Lamp and driving circuit thereof - Google Patents
Lamp and driving circuit thereof Download PDFInfo
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- CN102548095B CN102548095B CN201010600609.4A CN201010600609A CN102548095B CN 102548095 B CN102548095 B CN 102548095B CN 201010600609 A CN201010600609 A CN 201010600609A CN 102548095 B CN102548095 B CN 102548095B
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Abstract
The invention is suitable for the field of lamps and provides a lamp and a driving circuit thereof. In the embodiment of the invention, the current change of a current sampling resistor R3 reflects the output current change of the driving circuit of the lamp; as both a resistor R5 and the current sampling resistor R3 are connected in series between a machine shell ground and a signal ground, the pressure drop of the resistor R5 is the same as that of the current sampling resistor R3; and a constant-current control loop circuit can detect the current change of the current sampling resistor R3 by detecting the current change of the resistor R5 to ensure that a switch power supply can be controlled to output constant current. The constant-current control loop circuit has a simple structure and is low in cost.
Description
Technical field
The invention belongs to field of light fittings, relate in particular to a kind of light fixture and drive circuit thereof.
Background technology
Light fixture is widely used in the middle of daily life as electronic installation commonly used.
Conventional light fixture mainly comprises light-emitting component and drives the drive circuit of light-emitting component work, drive circuit comprises connected successively Switching Power Supply, transformer and current rectifying and wave filtering circuit, drive circuit is by alternating current after transformation, rectification, filtering are processed, and output DC powered light-emitting component is worked.
In addition, in order to reach the purpose of constant current output, can increase constant current chip in drive circuit, still, have like this problem that cost is high.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of lamp driving circuit, is intended to solve present lamp driving circuit and has for the purpose that reaches constant current output the problem that cost is high.
The embodiment of the present invention is to realize like this, a kind of lamp driving circuit, described lamp driving circuit comprises Switching Power Supply, transformer, current rectifying and wave filtering circuit and current sampling resistor R3, the input termination power of described Switching Power Supply, the armature winding of the output termination transformer of described Switching Power Supply, one end of the secondary winding of described transformer successively with current rectifying and wave filtering circuit, light-emitting component, current sampling resistor R3 connects and connects signal ground, another termination signal ground of the secondary winding of described transformer, described current sampling resistor R3 is serially connected between casing ground and signal ground, described lamp driving circuit also comprises:
Photoelectrical coupler U2;
Constant current control loop circuit, for detection of the curent change of current sampling resistor R3, control switch power supply output constant current;
Described constant current control loop circuit comprises resistance R 2, resistance R 4, resistance R 5, resistance R 6, resistance R 9, capacitor C 4, diode D3 and operational amplifier U1B;
The described current rectifying and wave filtering circuit of the first termination of described resistance R 4 and the tie point of light-emitting component, the second end of described resistance R 4 connects signal ground by resistance R 6 and the resistance R 5 of series connection successively, the tie point of described resistance R 6 and resistance R 5 connects the in-phase input end of operational amplifier U1B, the inverting input of described operational amplifier U1B is by capacitor C 4 and resistance R 2 output that meets operational amplifier U1B of series connection successively, the inverting input of the described operational amplifier U1B shell ground that also picks, the negative pole of the output terminating diode D3 of described operational amplifier U1B, the positive pole of described diode D3 connects the light-emitting diode negative pole of described photoelectrical coupler U2, the light-emitting diode positive pole of described photoelectrical coupler U2 connects described current rectifying and wave filtering circuit by resistance R 9, the collector and emitter of the triode of described photoelectrical coupler U2 connects respectively the control end of described Switching Power Supply,
Constant current operation principle: during working stability, by the resistance setting to resistance R 5 and resistance R 6, the voltage that makes the in-phase input end of operational amplifier U1B is 0V, the anti-phase input terminal voltage that is equal to operational amplifier U1B, when load current changes, signal feedback to Switching Power Supply is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc voltage revert to former design voltage.
Another purpose of the embodiment of the present invention is to provide a kind of light fixture that comprises above-mentioned lamp driving circuit.
In embodiments of the present invention, the output current of the curent change reflection lamp driving circuit of current sampling resistor R3 changes, because resistance R 5 and current sampling resistor R3 are serially connected between casing ground and signal ground, therefore both pressure drops are identical, constant current control loop circuit detects the curent change of current sampling resistor R3 by the curent change that detects resistance R 5, thereby control switch power supply output constant current, this constant current control loop circuit structure is simple, therefore with low cost.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of the lamp driving circuit that provides of the embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the circuit structure of the lamp driving circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
Lamp driving circuit comprises Switching Power Supply 100, transformer 200, current rectifying and wave filtering circuit 300 and current sampling resistor R3, the input termination power of Switching Power Supply 100, the armature winding of the output termination transformer 200 of Switching Power Supply 100, one end of the secondary winding of transformer 200 is connected and meets signal ground GND with current rectifying and wave filtering circuit 300, light-emitting component 400, current sampling resistor R3 successively, another termination signal ground GND of the secondary winding of transformer 200, current sampling resistor R3 is serially connected between casing ground PGND and signal ground GND, and lamp driving circuit also comprises:
Photoelectrical coupler U2;
Constant current control loop circuit 500, for detection of the curent change of current sampling resistor R3, control switch power supply 100 output constant currents;
Constant current control loop circuit 500 comprises resistance R 2, resistance R 4, resistance R 5, resistance R 6, resistance R 9, capacitor C 4, diode D2, diode D3 and operational amplifier U1B;
The first termination current rectifying and wave filtering circuit 300 of resistance R 4 and the tie point of light-emitting component 400, the second end of resistance R 4 meets signal ground GND by resistance R 6 and the resistance R 5 of series connection successively, the tie point of resistance R 6 and resistance R 5 connects the in-phase input end of operational amplifier U1B, the inverting input of operational amplifier U1B is by capacitor C 4 and resistance R 2 output that meets operational amplifier U1B of series connection successively, the inverting input of the operational amplifier U1B shell ground PGND that also picks, the negative pole of the output terminating diode D3 of operational amplifier U1B, the positive pole of diode D3 connects the light-emitting diode negative pole of photoelectrical coupler U2, the light-emitting diode positive pole of photoelectrical coupler U2 connects current rectifying and wave filtering circuit 300 by resistance R 9, the collector and emitter of the triode of photoelectrical coupler U2 connects respectively the control end of Switching Power Supply 100.
As one embodiment of the invention, lamp driving circuit also comprises:
Constant voltage control loop circuit 600, for detection of the output voltage variation of lamp driving circuit, control switch power supply 100 output constant voltages;
Constant voltage control loop circuit 600 comprises resistance R 1, resistance R 7, resistance R 8, capacitor C 3, diode D2, voltage-stabiliser tube ZD1 and operational amplifier U1A;
The second end of the in-phase input end while connecting resistance R4 of operational amplifier U1A and negative pole and the control utmost point of voltage-stabiliser tube ZD1, the positive pole of the voltage-stabiliser tube ZD1 shell ground PGND that picks, the inverting input of operational amplifier U1A is leaded up to capacitor C 3 and resistance R 1 output that meets operational amplifier U1A of series connection, the first end of another road while of the inverting input of operational amplifier U1A connecting resistance R7 and the first end of resistance R 8, the second termination current rectifying and wave filtering circuit 300 of resistance R 7 and the tie point of light-emitting component 400, the second termination current sampling resistor R3 of resistance R 8 and the tie point of light-emitting component 400, the negative pole of the output terminating diode D2 of operational amplifier U1A, the positive pole of diode D2 connects the light-emitting diode negative pole of photoelectrical coupler U2.
As one embodiment of the invention, voltage-stabiliser tube ZD1 adopts the voltage-stabiliser tube that model is TL431.
Below for example the operation principle of lamp driving circuit is described:
Constant current operation principle: during working stability, by the resistance setting to resistance R 5 and resistance R 6, the voltage that makes the in-phase input end of operational amplifier U1B is 0V, the anti-phase input terminal voltage that is equal to operational amplifier U1B, because resistance R 5 and current sampling resistor R3 are serially connected between casing ground PGND and signal ground GND, so both pressure drops are identical.When load current increases, the voltage drop of current sampling resistor R3 also can increase simultaneously, the voltage that is the in-phase input end of operational amplifier U1B increases, the output end voltage of operational amplifier U1B is increased, the LED current of photoelectrical coupler U2 is reduced, be coupled to again the collector and emitter of triode, signal feedback to Switching Power Supply 100 is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc revert to former design voltage; When load current reduces, the voltage drop of current sampling resistor R3 also can reduce simultaneously, it is the lower voltage of the in-phase input end of operational amplifier U1B, the output end voltage of operational amplifier U1B is reduced, the LED current of photoelectrical coupler U2 is increased, be coupled to again the collector and emitter of triode, signal feedback to Switching Power Supply 100 is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc voltage revert to former design voltage.
The constant voltage operation principle: resistance R 1 and capacitor C 3 arrange frequency bandwidth and the multiplication factor of constant voltage control loop circuit, during the work stable state, by resistance R 7 and resistance R 8 dividing points are set, be that 2.5V is identical with the voltage stabilizing value of voltage-stabiliser tube ZD1, when power input voltage changes the voltage rising that causes lamp driving circuit output voltage V cc, the inverting input of operational amplifier U1A will be over 2.5V, relatively amplification through operational amplifier U1A, the output output voltage of operational amplifier U1A was compared originally and can be reduced, the LED current of photoelectrical coupler U2 is increased, be coupled to again the collector and emitter of triode, signal feedback to Switching Power Supply 100 is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc voltage revert to former design voltage, when the power input voltage variation causes the lower voltage of lamp driving circuit output voltage V cc, the inverting input of operational amplifier U1A will be lower than 2.5V, relatively amplification through operational amplifier U1A, the output output voltage of operational amplifier U1A was compared originally and can be raise, the LED current of photoelectrical coupler U2 is reduced, be coupled to again the collector and emitter of triode, signal feedback to Switching Power Supply 100 is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc voltage revert to former design voltage.
In embodiments of the present invention, the output current of the curent change reflection lamp driving circuit of current sampling resistor R3 changes, because resistance R 5 and current sampling resistor R3 are serially connected between casing ground and signal ground, therefore both pressure drops are identical, constant current control loop circuit detects the curent change of current sampling resistor R3 by the curent change that detects resistance R 5, thereby control switch power supply output constant current, this constant current control loop circuit structure is simple, therefore with low cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a lamp driving circuit, described lamp driving circuit comprises Switching Power Supply, transformer, current rectifying and wave filtering circuit and current sampling resistor R3, the input termination power of described Switching Power Supply, the armature winding of the output termination transformer of described Switching Power Supply, one end of the secondary winding of described transformer successively with current rectifying and wave filtering circuit, light-emitting component, current sampling resistor R3 connects and connects signal ground, another termination signal ground of the secondary winding of described transformer, described current sampling resistor R3 is serially connected between casing ground and signal ground, it is characterized in that, described lamp driving circuit also comprises:
Photoelectrical coupler U2;
Constant current control loop circuit, for detection of the curent change of current sampling resistor R3, control switch power supply output constant current;
Described constant current control loop circuit comprises resistance R 2, resistance R 4, resistance R 5, resistance R 6, resistance R 9, capacitor C 4, diode D3 and operational amplifier U1B;
The described current rectifying and wave filtering circuit of the first termination of described resistance R 4 and the tie point of light-emitting component, the second end of described resistance R 4 connects signal ground by resistance R 6 and the resistance R 5 of series connection successively, the tie point of described resistance R 6 and resistance R 5 connects the in-phase input end of operational amplifier U1B, the inverting input of described operational amplifier U1B is by capacitor C 4 and resistance R 2 output that meets operational amplifier U1B of series connection successively, the inverting input of the described operational amplifier U1B shell ground that also picks, the negative pole of the output terminating diode D3 of described operational amplifier U1B, the positive pole of described diode D3 connects the light-emitting diode negative pole of described photoelectrical coupler U2, the light-emitting diode positive pole of described photoelectrical coupler U2 connects described current rectifying and wave filtering circuit by resistance R 9, the collector and emitter of the triode of described photoelectrical coupler U2 connects respectively the control end of described Switching Power Supply,
Constant current operation principle: during working stability, by the resistance setting to resistance R 5 and resistance R 6, the voltage that makes the in-phase input end of operational amplifier U1B is 0V, the anti-phase input terminal voltage that is equal to operational amplifier U1B, when load current changes, signal feedback to Switching Power Supply is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc voltage revert to former design voltage.
2. lamp driving circuit as claimed in claim 1, is characterized in that, described lamp driving circuit also comprises:
Constant voltage control loop circuit, for detection of the output voltage variation of lamp driving circuit, control switch power supply output constant voltage;
Described constant voltage control loop circuit comprises resistance R 1, resistance R 7, resistance R 8, capacitor C 3, diode D2, voltage-stabiliser tube ZD1 and operational amplifier U1A;
The second end of the in-phase input end while connecting resistance R4 of described operational amplifier U1A and negative pole and the control utmost point of voltage-stabiliser tube ZD1, the positive pole of the described voltage-stabiliser tube ZD1 shell ground that picks, the inverting input of described operational amplifier U1A is leaded up to capacitor C 3 and resistance R 1 output that meets operational amplifier U1A of series connection, the first end of another road while of the inverting input of described operational amplifier U1A connecting resistance R7 and the first end of resistance R 8, the described current rectifying and wave filtering circuit of the second termination of described resistance R 7 and the tie point of light-emitting component, the described current sampling resistor R3 of the second termination of described resistance R 8 and the tie point of light-emitting component, the negative pole of the output terminating diode D2 of described operational amplifier U1A, the positive pole of described diode D2 connects the light-emitting diode negative pole of described photoelectrical coupler U2,
Constant voltage operation principle: during the work stable state, by resistance R 7 and resistance R 8 dividing points are set, be that 2.5V is identical with the voltage stabilizing value of voltage-stabiliser tube ZD1, when power input voltage changes, signal feedback to Switching Power Supply is removed to adjust pwm signal, finally make lamp driving circuit output voltage V cc voltage revert to former design voltage.
3. lamp driving circuit as claimed in claim 2, is characterized in that, described voltage-stabiliser tube ZD1 adopts the voltage-stabiliser tube that model is TL431.
4. a light fixture, described light fixture comprises as the described lamp driving circuit of claim 1-3 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010600609.4A CN102548095B (en) | 2010-12-22 | 2010-12-22 | Lamp and driving circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010600609.4A CN102548095B (en) | 2010-12-22 | 2010-12-22 | Lamp and driving circuit thereof |
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| CN102548095A CN102548095A (en) | 2012-07-04 |
| CN102548095B true CN102548095B (en) | 2014-01-08 |
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| CN201010600609.4A Expired - Fee Related CN102548095B (en) | 2010-12-22 | 2010-12-22 | Lamp and driving circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959329A (en) * | 2017-12-05 | 2018-04-24 | 上海空间电源研究所 | Satellite lithium-ions battery constant-voltage charge Double Loop Control System and its control method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002637A (en) * | 2012-10-31 | 2013-03-27 | 芜湖崧欣电子科技有限公司 | LED constant current detection circuit and LED constant current drive circuit |
| CN103596343A (en) * | 2013-11-29 | 2014-02-19 | 昆山泰顺自动化设备有限公司 | LED driven feedback control circuit |
| EP2890220B1 (en) * | 2013-12-24 | 2023-10-25 | Silergy Semiconductor (Hong Kong) Limited | Bleeder circuit controller |
| CN105764203B (en) * | 2014-12-16 | 2019-02-22 | 海洋王照明科技股份有限公司 | Color temperature-tunable LED drive circuit |
| CN109862661A (en) * | 2019-02-22 | 2019-06-07 | 欧普照明股份有限公司 | A kind of power-supply controller of electric, connection load circuit and lamps and lanterns |
| CN111901934B (en) * | 2019-05-06 | 2023-02-03 | 广州彩熠灯光股份有限公司 | Multi-path LED constant current driving circuit with same color |
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| WO2010007808A1 (en) * | 2008-07-15 | 2010-01-21 | シャープ株式会社 | Light emitting element driving circuit |
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Patent Citations (5)
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|---|---|---|---|---|
| CN2697828Y (en) * | 2004-05-09 | 2005-05-04 | 王亚盛 | LED integrated module with constant current function |
| JP2007280895A (en) * | 2006-04-11 | 2007-10-25 | Calsonic Kansei Corp | Lighting control circuit |
| CN101431845A (en) * | 2007-11-05 | 2009-05-13 | 深圳桑达百利电器有限公司 | Driving method and circuit for LED lamp string |
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| CN107959329A (en) * | 2017-12-05 | 2018-04-24 | 上海空间电源研究所 | Satellite lithium-ions battery constant-voltage charge Double Loop Control System and its control method |
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| CN102548095A (en) | 2012-07-04 |
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