CN204046865U - A kind of high-efficiency separated LED drive circuit - Google Patents

A kind of high-efficiency separated LED drive circuit Download PDF

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Publication number
CN204046865U
CN204046865U CN201420365103.3U CN201420365103U CN204046865U CN 204046865 U CN204046865 U CN 204046865U CN 201420365103 U CN201420365103 U CN 201420365103U CN 204046865 U CN204046865 U CN 204046865U
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China
Prior art keywords
resistance
circuit
output
controller
electric capacity
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Expired - Fee Related
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CN201420365103.3U
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Chinese (zh)
Inventor
苏松得
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GUANGDONG LIANGDE OPTOELECTRONICS TECHNOLOGY CO LTD
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GUANGDONG LIANGDE OPTOELECTRONICS TECHNOLOGY CO LTD
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The utility model embodiment discloses a kind of high-efficiency separated LED drive circuit, the primary side with high precision completes constant voltage/constant current control circuit, comprises that rectified output current carries out the circuit of EMI filtering, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC produce circuit, on-off controller.Adopt the utility model, eliminate optical coupler and all secondary side CV/CC control circuits, also without the need to current sense resistor, can reach efficient.In the course of the work, there is autoboot to move defencive function, under output short-circuit or open-circuit condition, power output can be reduced to less than 95%, sluggish Thermal shutdown function, meet CEC and Energy Star 2.0 requirement.On-off controller can provide constant efficiency when pole underload.Under AC265V input condition, no-load power loss is less than 250mw, and leakage current is less than 5uA (need not Y capacitance) and pays and close EN55015B and CISPR-22B level Conducted EMI limit value.

Description

A kind of high-efficiency separated LED drive circuit
Technical field
The utility model relates to a kind of LED drive circuit, particularly relates to a kind of high-efficiency separated LED drive circuit.
Background technology
LED has the advantages such as energy-conservation, long service life, driving voltage are low, is a kind of new green environment protection light source, is widely used among the various occasions such as reading lamp, flashlight, headlight for vehicles, baby spot, label, dome illumination, decoration bright lamp.LED need adopt constant current drive mode; to ensure its normal luminous, and existing drive circuit does not possess autoboot moves defencive function, can not provide constant efficiency when pole underload; and can not power output be reduced under output short-circuit or open-circuit condition, ensure the fail safe of circuit.
Summary of the invention
The utility model embodiment technical problem to be solved is, provides a kind of high-efficiency separated LED drive circuit.Autoboot defencive function can be had at work, or when output short-circuit or open circuit, power output is reduced to less than 95%.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of high-efficiency separated LED drive circuit, comprises that rectified output current carries out the circuit of EMI filtering, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC produce circuit, on-off controller;
Described RDC clamp circuit is in parallel with the armature winding of described isolation type high frequency transformer, described armature winding connects the output of the circuit of described EMI filtering by described on-off controller, described on-off controller plays switch motion by inner MOSFET to described armature winding, and described armature winding plays discharge and recharge operation;
The input of described output rectifier and filter connects with the secondary winding of described isolation type high frequency transformer, and output connects with LED load;
The auxiliary winding of described isolation type high frequency transformer produces circuit with described VCC, on-off controller connects;
Described armature winding transfers energy to secondary winding, through described output rectifier and filter output dc voltage signal;
Described VCC produces circuit for described on-off controller provides power supply, and provides switch feedback signal for described on-off controller, makes described output rectifier and filter export constant voltage or constant current.
Further, the circuit of described EMI filtering is connected in series the first inductance L 1, second inductance L 2 respectively on the positive and negative terminal of rectifier bridge, with on output on the input that first differential mode filter capacitor C1 and the second differential mode filter capacitor C2 is connected to described first inductance L 1, second inductance L 2 respectively, the first damping resistance R1 and the second damping resistance R2 is connected on described first inductance L 1, second inductance L 2 respectively.
Further, described RDC clamp circuit is connected in series is formed by the first diode VD1, the first resistance R4, the second resistance R3, and described second resistance R3 is connected to the first electric capacity C3.
Further, described output rectifier and filter is made up of the 4th resistance R8, the 5th resistance R9, the second electric capacity C6, the 3rd electric capacity C7 and the second diode VD3, described second diode VD3, the 3rd electric capacity C7 are serially connected with on described secondary winding, described 5th resistance R9 is connected to as bleeder resistance on described 3rd electric capacity C7, and described 4th resistance R8, the second electric capacity C6 are connected on described second diode VD3 two ends after being connected in series.
Further, the auxiliary winding of described isolation type high frequency transformer is by having centre tap, first divider resistance R5, the second divider resistance R6 are series at described centre tap and power supply negative terminal, described on-off controller obtains output feedack from described first divider resistance R5,3rd diode VD2 is connected in series described auxiliary winding with the 4th electric capacity C5, and connect power supply negative terminal, the bypass end of described on-off controller connects described 3rd diode VD2 by the 6th resistance R7, and connects power supply negative terminal by the 5th electric capacity C4.
Implement the utility model embodiment, there is following beneficial effect: the utility model eliminates optical coupler and all secondary side CV/CC control circuits, also without the need to current sense resistor, can reach efficient.In the course of the work, there is autoboot to move defencive function, under output short-circuit or open-circuit condition, power output can be reduced to less than 95%, sluggish Thermal shutdown function, meet CEC and Energy Star 2.0 requirement.On-off controller can provide constant efficiency when pole underload.Under AC265V input condition, no-load power loss is less than 250mw, and leakage current is less than 5uA (need not Y capacitance) and pays and close EN55015B and CISPR-22B level Conducted EMI limit value.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of entirety of the present utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
With reference to the electrical block diagram of the present utility model shown in Fig. 1.
The high-efficiency separated LED drive circuit of one of the utility model embodiment, includes that rectified output current carries out the circuit of EMI filtering, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC produce circuit, on-off controller U1.
After rectification being carried out to input AC electricity through rectifier bridge BR1, filtering is carried out by the circuit of EMI filtering, the circuit of EMI filtering is by the first inductance L 1 and the second inductance L 2, first differential mode filter capacitor C1 and the second differential mode filter capacitor C2, first damping resistance R1 and the second damping resistance R2 is formed, first inductance L 1 and the second inductance L 2 are serially connected with on the positive and negative terminal of rectifier bridge respectively, first differential mode filter capacitor C1 is connected on rectifier bridge BR1 output, second differential mode filter capacitor C2 is connected on the end of the first inductance L 1 and the second inductance L 2, first damping resistance R1 and the second damping resistance R2 is connected to the first inductance L 1 respectively, on second inductance L 2, by the circuit of EMI filtering to differential mode conducted EMI noise adjustable attenuation, first damping resistance R1 and the second damping resistance R2 forms the resonance oscillations produced between damping capacitor and inductance
The input of rectifier bridge BR1 is connected in series fusible resistor RF1 and limits the surge current produced when starting, and input current excessive and break down time play the effect of fuse.
The armature winding of isolation type high frequency transformer T1 is parallel with RDC clamp circuit, RDC clamp circuit is connected in series is formed by the first diode VD1, the first resistance R4, the second resistance R3, described second resistance R3 is connected to the first electric capacity C3, and RDC clamp circuit also plays the spike of the drain voltage that restriction leakage inductance causes.
Armature winding is by the output current of the circuit of the switch terminals input EMI filtering of on-off controller U1, and on-off controller U1 plays switch motion by inner MOSFET to armature winding, and described armature winding plays discharge and recharge operation.
The input of output rectifier and filter connects with the secondary winding of isolation type high frequency transformer, output connects with LED load, output rectifier and filter is made up of the 4th resistance R8, the 5th resistance R9, the second electric capacity C6, the 3rd electric capacity C7 and the second diode VD3, second diode VD3, the 3rd electric capacity C7 are serially connected with on secondary winding, 5th resistance R9 is connected to as bleeder resistance on the 3rd electric capacity C7, and the 4th resistance R8, the second electric capacity C6 are connected on described second diode VD3 two ends after being connected in series.
VCC produces circuit and is made up of the first divider resistance R5 and the second divider resistance R6, the 3rd diode VD2 and the 4th electric capacity C5,3rd diode VD2 and the 4th electric capacity C5 is serially connected on the auxiliary winding of isolation type high frequency transformer T1 successively, first divider resistance R5 and the second divider resistance R6 to be serially connected on the centre tap of auxiliary winding and to be connected power supply negative terminal, the feedback input end FB of on-off controller U1 inputs the feedback signal of the first divider resistance R5, bypass end BP connects the 3rd diode VD2 by the 6th resistance R7, and connects power supply negative terminal by the 5th electric capacity C4.
The constant-current characteristics that this circuit design base is written on on-off controller U1 carrys out driving LED load, can carry out work under constant current mode with peak power output, and the constant pressure type of on-off controller U1 can provide output over-voltage to protect when open fault occurs any LED.When constant-current phase works, on-off controller U1 adjusts output current by the switching frequency changing MOSFET.Along with output voltage raises, U1 will improve its switching frequency automatically.The height of output voltage is decided by the VF voltage of LED in load thus.The resistance value of R5.R6 determines maximum switching frequency and output voltage.The inductance value of transformer can guarantee driver all the time with maximum power work.
If when output is broken down, circuit with constant pressure type work, and will enable switch control rule mode to adjust output voltage, provide output error protection, reduce power loss.The autoboot of U1 moves function simultaneously provides output short circuit protection.Completed by BP (bypass) pin of U1 like this and realize self-powered function, and decoupling is carried out to C4, high frequency decoupling is also provided.
When inner MOSFET conducting, U1 can use the energy be stored in C4, and when MOSFET turns off, inner pressurizer can pull out electric current from drain lead, so just can save external bias winding, reduces power loss.
Error in on-off controller U1 auto-compensation magnetizing inductance, a power output and setting inductance value is directly proportional, and power output change can detect at FB pin, will adjust switching frequency, and compensate when fluctuating to inductance when power output changes.
Above disclosedly be only a kind of preferred embodiment of the utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.

Claims (5)

1. a high-efficiency separated LED drive circuit, is characterized in that, comprise the circuit of EMI filtering is carried out to rectified output current, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC produce circuit, on-off controller;
Described RDC clamp circuit is in parallel with the armature winding of described isolation type high frequency transformer, described armature winding connects the output of the circuit of described EMI filtering by described on-off controller, described on-off controller plays switch motion by inner MOSFET to described armature winding, and described armature winding plays discharge and recharge operation;
The input of described output rectifier and filter connects with the secondary winding of described isolation type high frequency transformer, and output connects with LED load;
The auxiliary winding of described isolation type high frequency transformer produces circuit with described VCC, on-off controller connects;
Described armature winding transfers energy to secondary winding, through described output rectifier and filter output dc voltage signal;
Described VCC produces circuit for described on-off controller provides power supply, and provides switch feedback signal for described on-off controller, makes described output rectifier and filter export constant voltage or constant current.
2. high-efficiency separated LED drive circuit according to claim 1, it is characterized in that, the circuit of described EMI filtering is connected in series the first inductance L 1, second inductance L 2 respectively on the positive and negative terminal of rectifier bridge, with on output on the input that first differential mode filter capacitor C1 and the second differential mode filter capacitor C2 is connected to described first inductance L 1, second inductance L 2 respectively, the first damping resistance R1 and the second damping resistance R2 is connected on described first inductance L 1, second inductance L 2 respectively.
3. high-efficiency separated LED drive circuit according to claim 1, is characterized in that, described RDC clamp circuit is connected in series is formed by the first diode VD1, the first resistance R4, the second resistance R3, and described second resistance R3 is connected to the first electric capacity C3.
4. high-efficiency separated LED drive circuit according to claim 1, it is characterized in that, described output rectifier and filter is made up of the 4th resistance R8, the 5th resistance R9, the second electric capacity C6, the 3rd electric capacity C7 and the second diode VD3, described second diode VD3, the 3rd electric capacity C7 are serially connected with on described secondary winding, described 5th resistance R9 is connected to as bleeder resistance on described 3rd electric capacity C7, and described 4th resistance R8, the second electric capacity C6 are connected on described second diode VD3 two ends after being connected in series.
5. high-efficiency separated LED drive circuit according to claim 1, it is characterized in that, the auxiliary winding of described isolation type high frequency transformer is by having centre tap, first divider resistance R5, second divider resistance R6 is series at described centre tap and power supply negative terminal, described on-off controller obtains output feedack from described first divider resistance R5, 3rd diode VD2 is connected in series described auxiliary winding with the 4th electric capacity C5, and connect power supply negative terminal, the bypass end of described on-off controller connects described 3rd diode VD2 by the 6th resistance R7, and connect power supply negative terminal by the 5th electric capacity C4.
CN201420365103.3U 2014-07-03 2014-07-03 A kind of high-efficiency separated LED drive circuit Expired - Fee Related CN204046865U (en)

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CN201420365103.3U CN204046865U (en) 2014-07-03 2014-07-03 A kind of high-efficiency separated LED drive circuit

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Application Number Priority Date Filing Date Title
CN201420365103.3U CN204046865U (en) 2014-07-03 2014-07-03 A kind of high-efficiency separated LED drive circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104093245A (en) * 2014-07-03 2014-10-08 广东良得光电科技有限公司 Efficient isolation type LED drive circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104093245A (en) * 2014-07-03 2014-10-08 广东良得光电科技有限公司 Efficient isolation type LED drive circuit

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Granted publication date: 20141224

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CF01 Termination of patent right due to non-payment of annual fee