CN204291438U - A kind of LED power drive circuit - Google Patents
A kind of LED power drive circuit Download PDFInfo
- Publication number
- CN204291438U CN204291438U CN201420360053.XU CN201420360053U CN204291438U CN 204291438 U CN204291438 U CN 204291438U CN 201420360053 U CN201420360053 U CN 201420360053U CN 204291438 U CN204291438 U CN 204291438U
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- pwm controller
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- transformer
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Abstract
The utility model discloses a kind of LED power drive circuit, comprise PWM controller, transformer, rectifier bridge, filter circuit and metal-oxide-semiconductor VT, the input of described rectifier bridge connects civil power, output is connected with the input of the primary coil N1 of described transformer and the drain electrode of metal-oxide-semiconductor VT by filter circuit, and the output of secondary transformer N3 is connected with LED; The auxiliary winding N2 of described transformer is connected with the power input of PWM controller after filter capacitor C3 through rectifier diode VD5; The output of described PWM controller is connected with the grid of described metal-oxide-semiconductor VT.By under the end of oppisite phase feedback voltage signal of PWM controller and the control of current detecting end current signal, the pulse duration of the gate drive signal of metal-oxide-semiconductor VT is adjusted, by the mode of former limit FEEDBACK CONTROL, can realize when adding optocoupler and source of stable pressure, structure is simple and reduce cost.
Description
Technical field
The utility model relate to a kind of LED power drive circuit, belongs to power drives technical field.
Background technology
LED illumination, because of features such as its energy-saving and environmental protection and life-span length, becomes the development trend of following illumination.LED is unlike common incandescent lamp bulb, and directly can connect the electric main of 220V, it needs low-voltage direct to drive, and therefore must design complicated power converting circuit.The life-span of LED and driving power have very large relation, driving power power supply instability, and cause LED luminous efficiency to reduce, the lost of life, color changes, and even burns.In addition, conversion efficiency, constant current/constant voltage precision, power source life, electromagnetic compatibility etc. require it is also the factor that design LED drive power must be considered.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of LED power drive circuit, adopts former limit feedback system, and structure is simple and reduce cost, improves the reliability of system.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is:
A kind of LED power drive circuit, comprise PWM controller, transformer, rectifier bridge, filter circuit and metal-oxide-semiconductor VT, the input of described rectifier bridge connects civil power, output is connected with the input of the primary coil N1 of described transformer and the drain electrode of metal-oxide-semiconductor VT by filter circuit, and the output of secondary transformer N3 is connected with LED; The auxiliary winding N2 of described transformer is connected with the power input of PWM controller after filter capacitor C3 through rectifier diode VD5; The output of described PWM controller is connected with the grid of described metal-oxide-semiconductor VT.
Aforesaid a kind of LED power drive circuit, is characterized in that: be connected by dropping resistor R1, R2 between the output of described filter circuit and the power input of described PWM controller.
Aforesaid a kind of LED power drive circuit, is characterized in that: be also connected with feedback resistance R3, R4 between described auxiliary winding N2 and the end of oppisite phase of described PWM controller.
Aforesaid a kind of LED power drive circuit, is characterized in that: described metal-oxide-semiconductor VT source electrode is connected with the current sense input of described PWM controller, and by detecting resistance Rs ground connection.
Aforesaid a kind of LED power drive circuit, is characterized in that: be also in series with buffer capacitor C5 and buffering diode VD6 between two pins of the primary coil N1 of described transformer, described buffer capacitor C5 is also parallel with buffer resistance R5.
Aforesaid a kind of LED power drive circuit, is characterized in that: be in series with between two pins of the secondary coil N3 of described transformer and drive diode VD7 and drive electric capacity C6, described driving electric capacity C6 is also parallel with and drives resistance R6.
Aforesaid a kind of LED power drive circuit, is characterized in that: described rectifier bridge is the high voltage silicon stack rectifier bridge be made up of metal-oxide-semiconductor VD1-VD4.
Aforesaid a kind of LED power drive circuit, is characterized in that: described filter circuit comprises two filter capacitor C1, C2 parallel with one another, and is describedly also connected with inductance L 1 between two filter capacitors C1, C2.
The beneficial effects of the utility model are: by under the end of oppisite phase feedback voltage signal of PWM controller and the control of current detecting end current signal, the pulse duration of the gate drive signal of metal-oxide-semiconductor VT is adjusted, namely power supply and constant current hold is made by PWM, and at the secondary of transformer, alternating voltage is through diode VD7 rectification, electric capacity C6 filtering, obtain constant voltage and electric current to drive LED, by the mode of former limit FEEDBACK CONTROL, can realize when adding optocoupler and source of stable pressure, structure is simple and reduce cost.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of a kind of LED power drive circuit of the utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Figure 1, a kind of LED power drive circuit, comprise PWM controller, transformer, rectifier bridge, filter circuit and metal-oxide-semiconductor VT, in the present embodiment, rectifier bridge is the high voltage silicon stack rectifier bridge be made up of four metal-oxide-semiconductor VD1-VD4, the input of this rectifier bridge connects civil power, output is connected with the input of the primary coil N1 of described transformer and the drain electrode of metal-oxide-semiconductor VT by filter circuit, this filter circuit comprises two filter capacitor C1 parallel with one another, C2, and described two filter capacitor C1, inductance L 1 is also connected with between C2, the output of secondary transformer N3 is connected with LED, the auxiliary winding N2 of described transformer is connected with the power input of PWM controller after filter capacitor C3 through rectifier diode VD5, the output of described PWM controller is connected with the grid of described metal-oxide-semiconductor VT.By under the end of oppisite phase feedback voltage signal of PWM controller and the control of current detecting end current signal, the pulse duration of the gate drive signal of metal-oxide-semiconductor VT is adjusted, namely power supply and constant current hold is made by PWM, by the mode of former limit FEEDBACK CONTROL, can realize when adding optocoupler and source of stable pressure, structure is simple and reduce cost.
Be connected by dropping resistor R1, R2 between the output of described filter circuit and the power input of described PWM controller, in the initial condition of drive circuit, by rectifier and filter circuit rectification, filtered direct current by after dropping resistor R1, R2 step-down for PWM controller provides power supply.
Feedback resistance R3, R4 is also connected with, for the end of oppisite phase INV of PWM controller provides sampling feedback voltage between described auxiliary winding N2 and the end of oppisite phase of described PWM controller.
Described metal-oxide-semiconductor VT source electrode is connected with the current sense input of described PWM controller, and by detecting resistance Rs ground connection, being added on current detecting input pin CS, obtaining detecting electric current by the resistance Rs connecting metal-oxide-semiconductor VT source electrode by detecting the current signal obtained.
Buffer capacitor C5 and buffering diode VD6 is also in series with between two pins of the primary coil N1 of described transformer, described buffer capacitor C5 is also parallel with buffer resistance R5, the buffer network be made up of buffering diode VD6, R5, C5, inverse peak voltage can be made to consume its energy by diode VD6 and resistance R5, reduce inverse peak voltage, in order to avoid too high voltages appears in winding N1 in the process of switch, damage metal-oxide-semiconductor VT.
Be in series with between two pins of the secondary coil N3 of described transformer and drive diode VD7 and drive electric capacity C6, described driving electric capacity C6 is also parallel with and drives resistance R6, at the secondary of transformer, alternating voltage, through driving diode VD7 rectification, electric capacity C6 filtering, obtains constant voltage and electric current to drive LED.
In sum, a kind of LED power drive circuit that the utility model provides, adopts former limit feedback system, and structure is simple and reduce cost, improves the reliability of system.
More than show and describe general principle of the present utility model, principal character and advantage.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is by appending claims and equivalent circle thereof.
Claims (7)
1. a LED power drive circuit, comprise PWM controller, transformer, rectifier bridge, filter circuit and metal-oxide-semiconductor VT, the input of described rectifier bridge connects civil power, output is connected with the input of the primary coil N1 of described transformer and the drain electrode of metal-oxide-semiconductor VT by filter circuit, and the output of secondary transformer N3 is connected with LED; The auxiliary winding N2 of described transformer is connected with the power input of PWM controller after filter capacitor C3 through rectifier diode VD5; The output of described PWM controller is connected with the grid of described metal-oxide-semiconductor VT, it is characterized in that: described rectifier bridge is the high voltage silicon stack rectifier bridge be made up of metal-oxide-semiconductor VD1-VD4.
2. a kind of LED power drive circuit according to claim 1, be is characterized in that: be connected by dropping resistor R1, R2 between the output of described filter circuit and the power input of described PWM controller.
3. a kind of LED power drive circuit according to claim 2, is characterized in that: be also connected with feedback resistance R3, R4 between described auxiliary winding N2 and the end of oppisite phase of described PWM controller.
4. a kind of LED power drive circuit according to claim 3, is characterized in that: described metal-oxide-semiconductor VT source electrode is connected with the current sense input of described PWM controller, and by detecting resistance Rs ground connection.
5. a kind of LED power drive circuit according to claim 4, is characterized in that: be also in series with buffer capacitor C5 and buffering diode VD6 between two pins of the primary coil N1 of described transformer, described buffer capacitor C5 is also parallel with buffer resistance R5.
6. a kind of LED power drive circuit according to claim 5, is characterized in that: be in series with between two pins of the secondary coil N3 of described transformer and drive diode VD7 and drive electric capacity C6, described driving electric capacity C6 is also parallel with and drives resistance R6.
7. a kind of LED power drive circuit according to claim 6, is characterized in that: described filter circuit comprises two filter capacitor C1, C2 parallel with one another, and is describedly also connected with inductance L 1 between two filter capacitors C1, C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420360053.XU CN204291438U (en) | 2014-07-02 | 2014-07-02 | A kind of LED power drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420360053.XU CN204291438U (en) | 2014-07-02 | 2014-07-02 | A kind of LED power drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204291438U true CN204291438U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420360053.XU Expired - Fee Related CN204291438U (en) | 2014-07-02 | 2014-07-02 | A kind of LED power drive circuit |
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| Country | Link |
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| CN (1) | CN204291438U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135791A (en) * | 2014-07-02 | 2014-11-05 | 苏州工业职业技术学院 | LED power driving circuit |
-
2014
- 2014-07-02 CN CN201420360053.XU patent/CN204291438U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135791A (en) * | 2014-07-02 | 2014-11-05 | 苏州工业职业技术学院 | LED power driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20150702 |
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| EXPY | Termination of patent right or utility model |