LED driving circuit for hybrid control of single-stage bridgeless Sepic and LLC
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A technology of LED driving and hybrid control, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problems of high cost and poor reliability, reduce voltage stress, reduce cost and conduction loss, and improve applicable input Effect of voltage range
Inactive Publication Date: 2019-07-12
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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[0026] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.
[0027] Such as figure 1 As shown, this embodiment provides an LED driving circuit for hybrid control of single-stage bridgeless Sepic and LLC. Includes single-phase AC input power 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 , the first output capacitor C bus , the second output capacitor C o , Resonant capacitance C r , the first inductance L 1 , the second inductance L 2 , Resonant inductance L r , High-frequency transformer T (including primary winding Np, secondary winding Ns1, secondary winding Ns2), LE...
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Abstract
The invention relates to an LED driving circuit for hybrid control of a single-stage bridgeless Sepic and an LLC, which comprises a single-phase AC 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 Ds1, a seventh power diode Ds2, a first power switch tube S1, a power switch tube S2,a third power switch tube S3, a high-frequency capacitor C1, a first output capacitor Cbus, a second output capacitor Co, a resonant capacitor Cr, a first inductor L1, a second inductor L2, a resonantinductor Lr, a high-frequency transformer T including a primary winding Np, a secondary winding Ns1 and a secondary winding Ns2 and an LED lamp load. The LED driving circuit can accomplish adjustableconversion and realize a wide input voltage range, controllable bus voltage, a high power factor, low conduction loss and soft switch conversion, and improves the performance-price ratio of the driving circuit.
Description
technical field [0001] The invention relates to an LED drive circuit for hybrid control of single-stage bridgeless Sepic and LLC to realize wide input voltage, controllable bus voltage, high power factor, high efficiency and soft switch conversion. Background technique [0002] Lighting appliances need to meet a series of mandatory grid-side input current low-frequency harmonic limit related standards, such as IEEE519, IEC1000-3-2C and other standards. Therefore, power factor correction (PowerFactorCorrection—PFC) technology has become a key technology in the field of LED drive circuits, and research on high-efficiency PFC circuits has become a hot spot. [0003] The Sepic circuit can be raised or lowered, suitable for a wide input voltage range, and the bridgeless Sepic PFC circuit has an inductance at the input end, so the input and output current ripple and electromagnetic interference generated are relatively small, which improves the efficiency and power factor of the c...
Claims
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