CN202918560U - LED lamp power supply employing feedback voltage light for compensation control - Google Patents
LED lamp power supply employing feedback voltage light for compensation control Download PDFInfo
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- CN202918560U CN202918560U CN 201220591966 CN201220591966U CN202918560U CN 202918560 U CN202918560 U CN 202918560U CN 201220591966 CN201220591966 CN 201220591966 CN 201220591966 U CN201220591966 U CN 201220591966U CN 202918560 U CN202918560 U CN 202918560U
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Abstract
Provided is a LED lamp power supply employing feedback voltage light for compensation control, relating to a LED lamp power supply. The LED lamp power supply is provided with an AC input circuit, a rectification filtering circuit, a high frequency transformation control circuit, a high frequency transformer, a voltage division circuit, a current detection circuit, a voltage detection circuit and a rectification filtering output circuit. An input terminal and an output terminal of the rectification filtering circuit are respectively in connection with an output terminal of the AC input circuit and an input terminal of the high frequency transformation control circuit; an input terminal and an output terminal of the high frequency transformer are respectively in connection with the output terminal of the high frequency transformation control circuit and an input terminal of the rectification filtering output circuit. The voltage division circuit is provided with a light sensitive resistor and two divider resistors; one ends of the two divider resistors are in connection; the other end of a first divider resistor is in connection with a high frequency transformer feedback voltage output terminal; a connecting point of the two divider resistors is in connection with an input terminal of the voltage detection circuit; the light sensitive resistor is in parallel connection with the first divider resistor; output terminals of the voltage detection circuit and the current detection circuit are in connection with a control signal input terminal of the high frequency transformation control circuit.
Description
Technical field
The utility model relates to a kind of LED lamp power supply, especially relates to a kind of LED lamp power supply that adopts feedback voltage light compensation control.
Background technology
The LED lamp is well suited for light modulation, can regulate different brightness according to ambient light, thereby save unnecessary power consumption, so that more energy-conservation.The mode of at present light modulation has controllable silicon light modulation, digital system light modulation and automatic light compensation light modulation.Thyristor regulating is the simplest dimming mode only, is special-purpose circuit but require power supply, the like this light modulation of general power supply, and also the result of light modulation is the index of heavy damage power supply, can produce larger electromagnetic interference.Digital system light modulation and automatic light compensation light modulation more complicated, cost is higher, is not easy penetration and promotion.
Existing middle low power LED power supply is in order to reduce cost, major part all adopts limit, source constant-current circuit, namely at primary control output voltage and electric current, generally be provided with ac input circuit, current rectifying and wave filtering circuit, high frequency conversion control circuit, current detection circuit, voltage detecting circuit, high frequency transformer, bleeder circuit and rectifying and wave-filtering output circuit.
Summary of the invention
The purpose of this utility model is to provide a kind of LED lamp power supply that adopts feedback voltage light compensation control.
The utility model is provided with ac input circuit, current rectifying and wave filtering circuit, high frequency conversion control circuit, high frequency transformer, bleeder circuit, current detection circuit, voltage detecting circuit and rectifying and wave-filtering output circuit;
The input of described current rectifying and wave filtering circuit and output connect respectively the output of ac input circuit and the input of high frequency conversion control circuit; The input of described high frequency transformer and output connect respectively the output of high frequency conversion control circuit and the input of rectifying and wave-filtering output circuit, the external LED light fixture of the output of rectifying and wave-filtering output circuit;
Described bleeder circuit is provided with the 1st divider resistance, the 2nd divider resistance and photo resistance, the 1st divider resistance is connected with an end of the 2nd divider resistance, the other end of the 1st divider resistance is connected with the feedback voltage output of high frequency transformer, the other end ground connection of the 2nd divider resistance, the 1st divider resistance and the 2nd divider resistance tie point connect the input of voltage detecting circuit, photo resistance is in parallel with the 1st divider resistance, the voltage detecting control signal input of the output termination high frequency conversion control circuit of voltage detecting circuit; The current detecting control signal input of the output termination high frequency conversion control circuit of described current detection circuit.
Compare with existing LED lamp power supply, the utility model makes the LED lamp both satisfy the illumination needs according to the ambient light automatic regulating lightness as long as adopt a photo resistance just can realize that the light compensation is with an automatic light meter, can save unnecessary power consumption again; Simultaneously, cost is low, does not destroy again the performance index of power supply.
Description of drawings
Fig. 1 is the electric circuit constitute schematic diagram of the utility model embodiment.
Fig. 2 is the electric circuit constitute schematic diagram of the utility model embodiment.
Embodiment
Referring to Fig. 1, the utility model embodiment is provided with ac input circuit 1, current rectifying and wave filtering circuit 2, high frequency conversion control circuit 3, high frequency transformer 4, bleeder circuit, current detection circuit 6, voltage detecting circuit 7 and rectifying and wave-filtering output circuit 5;
The input of described current rectifying and wave filtering circuit 2 and output connect respectively the output of ac input circuit 1 and the input of high frequency conversion control circuit 3; The input of described high frequency transformer 4 and output connect respectively the output of high frequency conversion control circuit 3 and the input of rectifying and wave-filtering output circuit 5, the external LED light fixture 8 of the output of rectifying and wave-filtering output circuit 5;
Described bleeder circuit is provided with the 1st divider resistance R7, the 2nd divider resistance R5 and photo resistance R, the 1st divider resistance R7 is connected with the end of the 2nd divider resistance R5, the other end of the 1st divider resistance R7 is connected with the feedback voltage output of high frequency transformer 4, the other end ground connection of the 2nd divider resistance R5, the 1st divider resistance R7 and the 2nd divider resistance R5 tie point connect the input of voltage detecting circuit 7, photo resistance R is in parallel with the 1st divider resistance R7, the voltage detecting control signal input of the output termination high frequency conversion control circuit 3 of voltage detecting circuit 7; The current detecting control signal input of the output termination high frequency conversion control circuit 3 of described current detection circuit 6.
The electric circuit constitute schematic diagram of the utility model embodiment that Fig. 2 provides is the power circuit of a low-level source limit control, and its principle process is as follows:
The illumination alternating current is input to current rectifying and wave filtering circuit DB1 and C1 by the R1 that uses as fuse, converts galvanic current to and presses.The high frequency conversion control circuit of direct voltage by being formed by U1, Q1, R2, R3, R6, R8, C2, C3 and D1 etc., convert high-frequency alternating current to, be added to high frequency transformer (model is EPCE13) and carry out voltage transformation,, obtain stable low-voltage DC and supply with the work of LED lamp through the current rectifying and wave filtering circuit that D3, C6 form at transformer secondary output.Wherein, R5, R7, C4 form voltage detecting circuit control output voltage, and R4, R9, R10, R11 form current detection circuit control output current.C5, R12, D2 are absorbing circuits, are used for absorbing the high frequency spike of transformer, and R13 is used as minimum load resistance, only work in the power supply zero load.The 1st divider resistance of photo resistance R and bleeder circuit (or deserving to be called divider resistance) R7 is in parallel, and resistance can change along with light.According to the circuit needs, regulate the resistance of the 1st divider resistance R7, so that output voltage obtains needed intrinsic brilliance at a suitable numerical value.
The principle of foregoing circuit is: the high frequency conversion control circuit is controlled the output voltage of power supply by the feedback voltage that detects transformer, the feedback voltage that detects transformer will pass through bleeder circuit, bleeder circuit is comprised of two divider resistances (R7 and R5) and photo resistance R, change the ratio of these two divider resistances, just can change the detection electrical voltage point, output voltage is changed.In parallel photo resistance R and the 1st divider resistance R7, total resistance will change along with the intensity of light, and its dividing point also just changes.Light is stronger, and the resistance of photo resistance R is less, and its dividing point more up moves, and output voltage is just lower.When output voltage is lower than lighting of LED lamp just can not be luminous behind the voltage, thereby reach the purpose of automatic light compensation.
Claims (1)
1. a LED lamp power supply that adopts feedback voltage light compensation control is characterized in that being provided with ac input circuit, current rectifying and wave filtering circuit, high frequency conversion control circuit, high frequency transformer, bleeder circuit, current detection circuit, voltage detecting circuit and rectifying and wave-filtering output circuit;
The input of described current rectifying and wave filtering circuit and output connect respectively the output of ac input circuit and the input of high frequency conversion control circuit; The input of described high frequency transformer and output connect respectively the output of high frequency conversion control circuit and the input of rectifying and wave-filtering output circuit, the external LED light fixture of the output of rectifying and wave-filtering output circuit;
Described bleeder circuit is provided with the 1st divider resistance, the 2nd divider resistance and photo resistance, the 1st divider resistance is connected with an end of the 2nd divider resistance, the other end of the 1st divider resistance is connected with the feedback voltage output of high frequency transformer, the other end ground connection of the 2nd divider resistance, the 1st divider resistance and the 2nd divider resistance tie point connect the input of voltage detecting circuit, photo resistance is in parallel with the 1st divider resistance, the voltage detecting control signal input of the output termination high frequency conversion control circuit of voltage detecting circuit; The current detecting control signal input of the output termination high frequency conversion control circuit of described current detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220591966 CN202918560U (en) | 2012-11-09 | 2012-11-09 | LED lamp power supply employing feedback voltage light for compensation control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220591966 CN202918560U (en) | 2012-11-09 | 2012-11-09 | LED lamp power supply employing feedback voltage light for compensation control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202918560U true CN202918560U (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220591966 Expired - Fee Related CN202918560U (en) | 2012-11-09 | 2012-11-09 | LED lamp power supply employing feedback voltage light for compensation control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202918560U (en) |
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2012
- 2012-11-09 CN CN 201220591966 patent/CN202918560U/en not_active Expired - Fee Related
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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: 20130501 Termination date: 20141109 |
|
| EXPY | Termination of patent right or utility model |