Single-stage LED driving circuit integrated with Cuk and LLC voltage reduction circuits
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A LED drive and circuit technology, applied in the direction of high-efficiency power electronic conversion, electric light source, electrical components, etc., can solve the problems of high cost and poor reliability
Inactive Publication Date: 2018-06-29
FUZHOU UNIV
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The driving power supply of the two-stage structure requires two independent control systems, so its cost is high and its reliability is poor
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[0050] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0051] Such as figure 1 As shown, this embodiment provides a single-stage LED drive circuit integrating step-down Cuk and LLC converter, including a single-phase AC input power supply v in , the first power diode D 1 , the second power diode D 2 , the third power diode D 3 , the fourth power diode D 4 , the fifth power diode D 5 , the sixth power diode D 6 , the seventh power diode D 7 , the eighth power diode D s1 , the ninth power diode D s2 , the first power switch tube S 1 , the second power switch tube S 2 , High frequency capacitor C 1 , Bus capacitance C bus , output capacitance C o , Resonant capacitance C r , Cuk inductance L 1 , Cuk inductance L 2 , Resonant inductance L r , High frequency transformer T, LED light load.
[0052] The first power diode D 1 The cathode of the third power diode D 3 The cathode an...
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Abstract
The invention relates to a single-stage LED driving circuit integrated with Cuk and LLC voltage reduction circuits. The single-stage LED driving circuit comprises a single phase alternating current input power supply Vin, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a fifth power diode D5, a sixth power diode D6, a seventh power diode D7, an eighth power diode Ds1, a ninth power diode Ds2, a first power switch tube S1, a second power switch tube S2, a high frequency capacitor C1, a bus capacitor Cbus, an output capacitor Co, a resonant capacitor Cr, a Cuk inductance L1, a Cuk inductance L2, a resonant inductance Lr, a high frequency transformer T (containing a primary winding Np, a secondary side winding Ns1, a secondary side winding Ns2) and an LED light load. The single-stage LED driving circuit integrated with the Cuk and LLC voltage reduction circuits is oriented to a high voltage input application occasion, high power factor andsoft switch conversion are realized, and cost performance of the LED driving circuit is improved.
Description
technical field [0001] The invention relates to a single-stage LED drive circuit integrating step-down Cuk and LLC circuits, which is applied to AC high-voltage input occasions. Power factor and soft switching conversion. Background technique [0002] Lighting appliances above 25 watts need to meet a series of mandatory related standards, such as IEC555-2, IEC1000-3-2 and other standards. Therefore, the power factor correction (Power Factor Correction—PFC) technology has become a key technology in the field of LED driving circuits. In the case of high-voltage AC input, research on high-efficiency step-down PFC circuits has become a hot spot. [0003] The switching tube of the LLC resonant converter can work in the soft switching mode, and its switching loss can be kept at a very low level, and it has been widely used in medium and high power LED drive systems. Generally, the efficiency of an independent LLC resonant converter is above 90%. The traditional AC input LED dr...
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