CN104093245A - Efficient isolation type LED drive circuit - Google Patents
Efficient isolation type LED drive circuit Download PDFInfo
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- CN104093245A CN104093245A CN201410313975.XA CN201410313975A CN104093245A CN 104093245 A CN104093245 A CN 104093245A CN 201410313975 A CN201410313975 A CN 201410313975A CN 104093245 A CN104093245 A CN 104093245A
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Abstract
The embodiment of the invention discloses an efficient isolation type LED drive circuit. The efficient isolation type LED drive circuit is provided with a high-precision primary side constant voltage/constant current control circuit and comprises a circuit for rectifying output currents to carry out EMI filtration, an isolation type high-frequency transformer, an RDC clamping circuit, an output rectification filter circuit, a VCC generation circuit and an on-off controller. By the adoption of the efficient isolation type LED drive circuit, an optical coupler and all secondary side CV/CC control circuits are omitted, and high efficiency can be achieved without a sense resistor. In the working process, the LED drive circuit has an automatic restart protection function, output power can be reduced below 95 percent under the condition that output of a short circuit or open circuit happens, and the LED drive circuit has a sluggish thermal shutdown function and meets the requirements of CEC and Energy Star 2.0. The on-off controller can provide constant efficiency during extremely light loads. Under the AC265V output condition, the no-load power loss is less than 250 mw, and leakage currents are less than 5 microamps (a Y capacitor is not needed) and meets EN55015 B and CISPR-22B grade transmission EMI limiting values.
Description
Technical field
The present invention relates to a kind of LED drive circuit, relate in particular to a kind of high-efficiency separated LED drive circuit.
Background technology
The advantages such as that LED light fixture has is energy-conservation, long service life, driving voltage are low, are a kind of new green environment protection light sources, are widely used in reading lamp, flashlight, headlight for vehicles, baby spot, label, dome illumination, decorate among the various occasions such as bright lamp.LED lamp need adopt constant current drive mode; normally luminous to guarantee it, and existing drive circuit does not possess the moving defencive function of autoboot, and constant efficiency can not be provided when utmost point underload; and under output short-circuit or open-circuit condition, can not reduce power output, guarantee the fail safe of circuit.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, a kind of high-efficiency separated LED drive circuit is provided.Can there is at work autoboot defencive function, or when output short-circuit or open circuit, power output is reduced to below 95%.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of high-efficiency separated LED drive circuit, comprises that rectification output current carries out the circuit of EMI filtering, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC generation 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 rises and discharges and recharges 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 and provides power supply for described on-off controller, and for described on-off controller provides switch feedback signal, makes described output rectifier and filter output constant voltage or constant current.
Further, the circuit of described EMI filtering is connected in series respectively the first inductance L 1, the second inductance L 2 on the positive and negative terminal of rectifier bridge, the first differential mode filter capacitor C1 and the second differential mode filter capacitor C2 be connected to respectively on the input of described the first inductance L 1, the second inductance L 2 with output on, the first damping resistance R1 and the second damping resistance R2 are connected to respectively on described the first inductance L 1, the second inductance L 2.
Further, described RDC clamp circuit is formed by the first diode VD1, the first resistance R 4, the second resistance R 3 serial connections, in described the second resistance R 3 and be connected to the first capacitor C 3.
Further, described output rectifier and filter consists of the 4th resistance R 8, the 5th resistance R 9, the second capacitor C 6, the 3rd capacitor C 7 and the second diode VD3, described the second diode VD3, the 3rd capacitor C 7 are serially connected with on described secondary winding, described the 5th resistance R 9 is connected on described the 3rd capacitor C 7 as bleeder resistance, after described the 4th resistance R 8, the second capacitor C 6 serial connections, is connected on described the second diode VD3 two ends.
Further, the auxiliary winding of described isolation type high frequency transformer is by having centre tap, the 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 feedback from described the first divider resistance R5, the 3rd diode VD2 is connected in series described auxiliary winding with the 4th capacitor C 5, and connect power supply negative terminal, the bypass end of described on-off controller connects described the 3rd diode VD2 by the 6th resistance R 7, and connects power supply negative terminal by the 5th capacitor C 4.
Implement the embodiment of the present invention, there is following beneficial effect: the present invention has saved optical coupler and all secondary side CV/CC control circuits, also without current sense resistor, can reach efficient.In the course of the work, have autoboot to move defencive function, can under output short-circuit or open-circuit condition, power output be reduced to below 95%, sluggish hot turn-off function, meets CEC and Energy Star 2.0 requirements.On-off controller can provide constant efficiency when utmost point underload.Under AC265V input condition, no-load power loss is less than 250mw, and leakage current is less than 5uA (need not Y electric capacity) and pays and close EN55015B and CISPR-22B level Conducted EMI limit value.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of integral body of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
With reference to the electrical block diagram of the present invention shown in Fig. 1.
A kind of high-efficiency separated LED drive circuit of the embodiment of the present invention, has comprised that rectification output current carries out the circuit of EMI filtering, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC generation circuit, on-off controller U1.
After input AC electricity being carried out to rectification through rectifier bridge BR1, circuit by EMI filtering carries out filtering, the circuit of EMI filtering is by the first inductance L 1 and the second inductance L 2, the first differential mode filter capacitor C1 and the second differential mode filter capacitor C2, the first damping resistance R1 and the second damping resistance R2 form, the first inductance L 1 and the second inductance L 2 are serially connected with respectively on the positive and negative terminal of rectifier bridge, the first differential mode filter capacitor C1 is connected on rectifier bridge BR1 output, the second differential mode filter capacitor C2 is connected on the end of the first inductance L 1 and the second inductance L 2, the first damping resistance R1 and the second damping resistance R2 are connected to respectively the first inductance L 1, on the second inductance L 2, circuit by EMI filtering to differential mode Conducted EMI noise attentuation control, the first damping resistance R1 and the second damping resistance R2 form the resonance oscillations producing between damping capacitor and inductance
On the input of rectifier bridge BR1, be connected in series the surge current producing when fusible resistor RF1 restriction starts, and excessive and play the effect of fuse while breaking down at input current.
The armature winding of isolation type high frequency transformer T1 is parallel with RDC clamp circuit, RDC clamp circuit is formed by the first diode VD1, the first resistance R 4, the second resistance R 3 serial connections, in described the second resistance R 3 and be connected to the first capacitor C 3, 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 rises and discharges and recharges 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 consists of the 4th resistance R 8, the 5th resistance R 9, the second capacitor C 6, the 3rd capacitor C 7 and the second diode VD3, the second diode VD3, the 3rd capacitor C 7 are serially connected with on secondary winding, the 5th resistance R 9 is connected on the 3rd capacitor C 7 as bleeder resistance, after the 4th resistance R 8, the second capacitor C 6 serial connections, is connected on described the second diode VD3 two ends.
VCC produces circuit and consists of the first divider resistance R5 and the second divider resistance R6, the 3rd diode VD2 and the 4th capacitor C 5, the 3rd diode VD2 and the 4th capacitor C 5 are serially connected on the auxiliary winding of isolation type high frequency transformer T1 successively, the first divider resistance R5 and the second divider resistance R6 are serially connected on the centre tap of auxiliary winding and are 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 R 7, and connects power supply negative terminal by the 5th capacitor C 4.
This circuit design base is written on the constant-current characteristics of on-off controller U1 and carrys out driving LED load, can under constant current mode, with peak power output, carry out work, and the constant pressure type of on-off controller U1 can provide output over-voltage protection when open fault occurs any LED.When constant-current phase is worked, on-off controller U1 adjusts output current by the switching frequency of change MOSFET.Along with output voltage raises, U1 will improve its switching frequency automatically.The height of output voltage is that the VF voltage of LED in load decides thus.The resistance value of R5.R6 has determined maximum switching frequency and output voltage.The inductance value of transformer can guarantee that driver is all the time with maximum power work.
If output is when break down, circuit will be with constant pressure type work, and enable switch control mode and adjust output voltage, and output error protection is provided, and reduces power loss.The moving function of the autoboot of U1 provides output short circuit protection simultaneously.BP (bypass) pin by U1 completes and realizes self-powered function like this, and C4 is carried out to decoupling, and high frequency decoupling is also provided.
When inner MOSFET conducting, U1 can be used the energy being stored in C4, and when MOSFET turn-offs, inner pressurizer can be pulled out electric current from drain lead, so just can save external bias winding, reduces power loss.
Error in magnetizing inductance of on-off controller U1 auto-compensation, power output is directly proportional to setting an inductance value, and power output changes and can detect at FB pin, when power output changes, will adjust switching frequency, when inductance is fluctuateed, compensates.
Above disclosed is only a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (5)
1. a high-efficiency separated LED drive circuit, is characterized in that, comprises the circuit, isolation type high frequency transformer, RDC clamp circuit, output rectifier and filter, VCC generation circuit, the on-off controller that rectification output current are carried out to EMI filtering;
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 rises and discharges and recharges 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 and provides power supply for described on-off controller, and for described on-off controller provides switch feedback signal, makes described output rectifier and filter output 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 respectively the first inductance L 1, the second inductance L 2 on the positive and negative terminal of rectifier bridge, the first differential mode filter capacitor C1 and the second differential mode filter capacitor C2 be connected to respectively on the input of described the first inductance L 1, the second inductance L 2 with output on, the first damping resistance R1 and the second damping resistance R2 are connected to respectively on described the first inductance L 1, the second inductance L 2.
3. high-efficiency separated LED drive circuit according to claim 1, is characterized in that, described RDC clamp circuit is formed by the first diode VD1, the first resistance R 4, the second resistance R 3 serial connections, in described the second resistance R 3 and be connected to the first capacitor C 3.
4. high-efficiency separated LED drive circuit according to claim 1, it is characterized in that, described output rectifier and filter consists of the 4th resistance R 8, the 5th resistance R 9, the second capacitor C 6, the 3rd capacitor C 7 and the second diode VD3, described the second diode VD3, the 3rd capacitor C 7 are serially connected with on described secondary winding, described the 5th resistance R 9 is connected on described the 3rd capacitor C 7 as bleeder resistance, after described the 4th resistance R 8, the second capacitor C 6 serial connections, is connected on described the second diode VD3 two ends.
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, the first divider resistance R5, the second divider resistance R6 is series at described centre tap and power supply negative terminal, described on-off controller obtains output feedback from described the first divider resistance R5, the 3rd diode VD2 is connected in series described auxiliary winding with the 4th capacitor C 5, and connect power supply negative terminal, the bypass end of described on-off controller connects described the 3rd diode VD2 by the 6th resistance R 7, and connect power supply negative terminal by the 5th capacitor C 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410313975.XA CN104093245A (en) | 2014-07-03 | 2014-07-03 | Efficient isolation type LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410313975.XA CN104093245A (en) | 2014-07-03 | 2014-07-03 | Efficient isolation type LED drive circuit |
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| CN104093245A true CN104093245A (en) | 2014-10-08 |
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| CN201410313975.XA Pending CN104093245A (en) | 2014-07-03 | 2014-07-03 | Efficient isolation type LED drive circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467811A (en) * | 2014-10-31 | 2015-03-25 | 许继电气股份有限公司 | Anti-interference on-off input circuit |
| CN105634265A (en) * | 2016-03-22 | 2016-06-01 | 深圳市京泉华科技股份有限公司 | Power supply device and planar transformer thereof |
| CN105792431A (en) * | 2016-04-14 | 2016-07-20 | 成都恒稳光电科技有限公司 | Led lamp energy-saving power supply |
| CN107517516A (en) * | 2017-08-15 | 2017-12-26 | 山东旭程照明科技有限公司 | A kind of double bright control systems of radar induction LED driving |
| WO2021026876A1 (en) * | 2019-08-15 | 2021-02-18 | Tridonic Gmbh & Co Kg | Driver module and lighting system suitable for use in a humid environment |
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| EP1278070A2 (en) * | 2001-07-20 | 2003-01-22 | Power Integrations, Inc. | Method and apparatus for low cost current and voltage sensing in circuits as a function of a voltage drop |
| CN203278658U (en) * | 2013-05-22 | 2013-11-06 | Tcl空调器(中山)有限公司 | switching power supply circuit |
| CN204046865U (en) * | 2014-07-03 | 2014-12-24 | 广东良得光电科技有限公司 | A kind of high-efficiency separated LED drive circuit |
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2014
- 2014-07-03 CN CN201410313975.XA patent/CN104093245A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1278070A2 (en) * | 2001-07-20 | 2003-01-22 | Power Integrations, Inc. | Method and apparatus for low cost current and voltage sensing in circuits as a function of a voltage drop |
| CN203278658U (en) * | 2013-05-22 | 2013-11-06 | Tcl空调器(中山)有限公司 | switching power supply circuit |
| CN204046865U (en) * | 2014-07-03 | 2014-12-24 | 广东良得光电科技有限公司 | A kind of high-efficiency separated LED drive circuit |
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| 百度文库: "采用LNK606PG设计的5.32W LED驱动器", 《百度文库》, 27 November 2010 (2010-11-27) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467811A (en) * | 2014-10-31 | 2015-03-25 | 许继电气股份有限公司 | Anti-interference on-off input circuit |
| CN105634265A (en) * | 2016-03-22 | 2016-06-01 | 深圳市京泉华科技股份有限公司 | Power supply device and planar transformer thereof |
| CN105792431A (en) * | 2016-04-14 | 2016-07-20 | 成都恒稳光电科技有限公司 | Led lamp energy-saving power supply |
| CN107517516A (en) * | 2017-08-15 | 2017-12-26 | 山东旭程照明科技有限公司 | A kind of double bright control systems of radar induction LED driving |
| CN107517516B (en) * | 2017-08-15 | 2023-10-27 | 山东旭程照明科技有限公司 | Radar induction LED driven double-brightness control system |
| WO2021026876A1 (en) * | 2019-08-15 | 2021-02-18 | Tridonic Gmbh & Co Kg | Driver module and lighting system suitable for use in a humid environment |
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Application publication date: 20141008 |