LED driver circuits that reduce observable optical flicker by reducing rectified ac power grid ripple using a flyback converter
A driver circuit and reverse converter technology, applied in the field of driver circuits, can solve the problem of increasing the statistical failure rate of PSU
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[0080] The following examples of embodiments of the present invention are for illustrative purposes and it should be apparent to the reader that limiting by output voltage from the PSU section, current drawn by the LED strings, and supply voltage and frequency can be achieved in many other embodiments and Illustrative example.
[0081] This or any other example of the invention is explained in terms of relevant design parameters of the PSU section and the current regulator section of the LED driver.
[0082] The peak output voltage of the PSU section of the driver is given by:
[0083] Vop=Vinp×N×Dp / (I-Dp) Equation (14)
[0084] where Dp is the peak duty cycle of the switching action of the switching MOSFET, and Vinp is the peak value of the full-wave rectified single-phase supply voltage, which is given by:
[0085] Equation (15)
[0086] where Vrms is the rms supply voltage and vd is the voltage drop across a single diode within the rectifier during a half cycle of the...
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