FIELD: electricity.
SUBSTANCE: invention relates to a power supply circuit, particularly to a power supply circuit for increasing the flickering frequency of a light-emitting diode by means of a charging/discharging circuit and a switch connected between an alternating voltage source and a load. Result is achieved due to that the power supply circuit includes: a rectifying circuit connected to the alternating voltage source for full-wave rectification of the alternating voltage thereof; a charging/discharging circuit with one end connected to the output terminal of the rectifying circuit and a light-emitting diode array, and the other end to ground so as to be charged with the output voltage of the rectifying circuit and to supply power to the light-emitting diode array; a first switch arranged in the path connecting the charging/discharging circuit and the light-emitting diode array; and a controller for controlling the first switch so as to enable the charging/discharging circuit to discharge in the interval A less than the drive voltage of the light-emitting diode array, thus causing the light-emitting diode array to flicker at least one time in the interval A. Power supply circuit can apply by means of the charging/discharging circuit and the switch a pulsed voltage equal to or greater than the drive voltage to the peripheral regions of a phase of 180 degrees, where the voltage supplied from the alternating voltage source is equal to or less than the drive voltage and so cannot drive the light-emitting diodes.
EFFECT: technical result is an increase in the flicker frequency of the LED to more than 240 Hz (when the alternating voltage source is 60 Hz).
6 cl, 13 dwg
