CN104135791A - LED power driving circuit - Google Patents
LED power driving circuit Download PDFInfo
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- CN104135791A CN104135791A CN201410309214.7A CN201410309214A CN104135791A CN 104135791 A CN104135791 A CN 104135791A CN 201410309214 A CN201410309214 A CN 201410309214A CN 104135791 A CN104135791 A CN 104135791A
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- driving circuit
- power driving
- transformer
- pwm controller
- led power
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Abstract
The invention discloses an LED (Light-Emitting Diode) power driving circuit which comprises a PWM (Pulse Width Modulation) controller, a transformer, a rectifier bridge, a filter circuit and a MOS (Metal Oxide Semiconductor) tube VT, wherein the input end of the rectifier bridge is connected with mains supply, the output end of the rectifier bridge is connected with the input end of a primary-side coil N1 of the transformer and a drain of the MOS tube VT via the filter circuit, the output end of a secondary-side coil N3 of the transformer is connected with an LED lamp, an auxiliary winding N2 of the transformer pass through a rectification diode VD5 and a filter capacitor C3 to be connected with a power input end of the PWM controller, and the output end of the PWM controller is connected with a gate of the MOS tube VT. Through the control of a feedback voltage signal of an inverse phase end of the PWM controller and a current signal of a current detection end, the pulse width of a gate driving signal of the MOS tube VT is adjusted, through a mode of primary-side feedback control, the LED power driving circuit can be achieved on conditions of no addition of an optocoupler and a voltage stabilization source, the LED power driving circuit is simple in structure, and cost is reduced.
Description
Technical field
The present invention relates to a kind of LED power driving circuit, belonged 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 lamp, unlike common incandescent lamp bulb, can directly connect the electric main of 220V, and it needs low-voltage direct to drive, therefore must the complicated power converting circuit of design.The life-span of LED and driving power have very large relation, and driving power power supply instability causes LED luminous efficiency to reduce, the lost of life, and color changes, and even burns.In addition, the requirement such as conversion efficiency, constant current/constant voltage precision, power source life, electromagnetic compatibility is also the factor that design LED driving power must be considered.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of LED power driving circuit, adopts former limit feedback system, simple in structure and reduced cost, has improved the reliability of system.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of LED power driving 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 transformer secondary coil N3 is connected with LED lamp; 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 driving circuit, is characterized in that: between the output of described filter circuit and the power input of described PWM controller, be connected by dropping resistor R1, R2.
Aforesaid a kind of LED power driving circuit, is characterized in that: between described auxiliary winding N2 and the end of oppisite phase of described PWM controller, be also connected with feedback resistance R3, R4.
Aforesaid a kind of LED power driving circuit, is characterized in that: described metal-oxide-semiconductor VT source electrode is connected with the current detecting input of described PWM controller, and by detecting resistance R s ground connection.
Aforesaid a kind of LED power driving circuit, is characterized in that: between two pins of the primary coil N1 of described transformer, be also in series with buffer capacitor C5 and buffering diode VD6, on described buffer capacitor C5, be also parallel with buffer resistance R5.
Aforesaid a kind of LED power driving circuit, is characterized in that: between two pins of the secondary coil N3 of described transformer, be in series with and drive diode VD7 and drive capacitor C 6, be also parallel with and drive resistance R 6 in described driving capacitor C 6.
Aforesaid a kind of LED power driving circuit, is characterized in that: described rectifier bridge is the high voltage silicon stack rectifier bridge being made up of metal-oxide-semiconductor VD1-VD4.
Aforesaid a kind of LED power driving circuit, is characterized in that: described filter circuit comprises two filter capacitor C1, C2 parallel with one another, and is also connected with inductance L 1 between described two filter capacitor C1, C2.
The invention has the beneficial effects as follows: 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 to metal-oxide-semiconductor VT is adjusted, make power supply and electric current keep constant by PWM, and at the secondary of transformer, alternating voltage is through diode VD7 rectification, capacitor C 6 filtering, obtain constant voltage and electric current drives LED, by the mode of former limit FEEDBACK CONTROL, in the situation that need not adding optocoupler and source of stable pressure, can realize, simple in structure and reduced cost.
Brief description of the drawings
Fig. 1 is the circuit connection diagram of a kind of LED power driving circuit of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, a kind of LED power driving 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 being 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, between C2, be also connected with inductance L 1, the output of transformer secondary coil N3 is connected with LED lamp, 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.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 to metal-oxide-semiconductor VT is adjusted, make power supply and electric current keep constant by PWM, by the mode of former limit FEEDBACK CONTROL, in the situation that need not adding optocoupler and source of stable pressure, can realize, simple in structure and reduced cost.
Between the power input of the output of described filter circuit and described PWM controller, be connected by dropping resistor R1, R2, in the initial condition of drive circuit, provide power supply for PWM controller by rectifier and filter circuit rectification, filtered direct current after by dropping resistor R1, R2 step-down.
Between described auxiliary winding N2 and the end of oppisite phase of described PWM controller, be also connected with feedback resistance R3, R4, for the end of oppisite phase INV of PWM controller provides sampling feedback voltage.
Described metal-oxide-semiconductor VT source electrode is connected with the current detecting input of described PWM controller, and by detecting resistance R s ground connection, current signal detection being obtained by the resistance R s of connection metal-oxide-semiconductor VT source electrode is added on current detecting input pin CS, obtains detecting electric current.
Between two pins of the primary coil N1 of described transformer, be also in series with buffer capacitor C5 and buffering diode VD6, on described buffer capacitor C5, be also parallel with buffer resistance R5, the buffer network being formed by buffering diode VD6, R5, C5, can make inverse peak voltage consume its energy by diode VD6 and resistance R 5, reduce inverse peak voltage, in order to avoid there is too high voltages on winding N1 in the process of switch, damage metal-oxide-semiconductor VT.
Between two pins of the secondary coil N3 of described transformer, be in series with and drive diode VD7 and drive capacitor C 6, in described driving capacitor C 6, be also parallel with and drive resistance R 6, at the secondary of transformer, alternating voltage is through driving diode VD7 rectification, capacitor C 6 filtering, obtains constant voltage and electric current drives LED.
In sum, a kind of LED power driving circuit provided by the invention, adopts former limit feedback system, simple in structure and reduced cost, has improved the reliability of system.
More than show and described general principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is by appending claims and equivalent circle thereof.
Claims (8)
1. a LED power driving circuit, it is characterized in that: 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 transformer secondary coil N3 is connected with LED lamp; 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.
2. a kind of LED power driving circuit according to claim 1, is characterized in that: between the output of described filter circuit and the power input of described PWM controller, be connected by dropping resistor R1, R2.
3. a kind of LED power driving circuit according to claim 2, is characterized in that: between described auxiliary winding N2 and the end of oppisite phase of described PWM controller, be also connected with feedback resistance R3, R4.
4. a kind of LED power driving circuit according to claim 3, is characterized in that: described metal-oxide-semiconductor VT source electrode is connected with the current detecting input of described PWM controller, and by detecting resistance R s ground connection.
5. a kind of LED power driving circuit according to claim 4, is characterized in that: between two pins of the primary coil N1 of described transformer, be also in series with buffer capacitor C5 and buffering diode VD6, on described buffer capacitor C5, be also parallel with buffer resistance R5.
6. a kind of LED power driving circuit according to claim 5, is characterized in that: between two pins of the secondary coil N3 of described transformer, be in series with and drive diode VD7 and drive capacitor C 6, be also parallel with and drive resistance R 6 in described driving capacitor C 6.
7. a kind of LED power driving circuit according to claim 6, is characterized in that: described rectifier bridge is the high voltage silicon stack rectifier bridge being made up of metal-oxide-semiconductor VD1-VD4.
8. a kind of LED power driving circuit according to claim 7, is characterized in that: described filter circuit comprises two filter capacitor C1, C2 parallel with one another, and is also connected with inductance L 1 between described two filter capacitor C1, C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309214.7A CN104135791A (en) | 2014-07-02 | 2014-07-02 | LED power driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309214.7A CN104135791A (en) | 2014-07-02 | 2014-07-02 | LED power driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104135791A true CN104135791A (en) | 2014-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410309214.7A Pending CN104135791A (en) | 2014-07-02 | 2014-07-02 | LED power driving circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201854482U (en) * | 2010-11-01 | 2011-06-01 | 王子能 | LED power circuit |
| CN102984859A (en) * | 2012-11-16 | 2013-03-20 | 深圳和而泰照明科技有限公司 | Light-emitting diode (LED) driving circuit and light-emitting diode (LED) driving device |
| CN204291438U (en) * | 2014-07-02 | 2015-04-22 | 苏州工业职业技术学院 | A kind of LED power drive circuit |
-
2014
- 2014-07-02 CN CN201410309214.7A patent/CN104135791A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201854482U (en) * | 2010-11-01 | 2011-06-01 | 王子能 | LED power circuit |
| CN102984859A (en) * | 2012-11-16 | 2013-03-20 | 深圳和而泰照明科技有限公司 | Light-emitting diode (LED) driving circuit and light-emitting diode (LED) driving device |
| CN204291438U (en) * | 2014-07-02 | 2015-04-22 | 苏州工业职业技术学院 | A kind of LED power drive circuit |
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Application publication date: 20141105 |