The invention discloses a large
capacitance rapid
discharge device of a light-emitting
diode (LED) drive power supply output end and belongs to the technical field of LED drive power supply. The device mainly comprises an input / output
rectifier filter circuit, a high-frequency
transformer, a pulse-width modulation (PWM) switch, a
direct current (DC) circuit and a rapid
discharge circuit, the rapid
discharge circuit comprises a power supply switch detection circuit, a
control circuit and a discharge circuit, one end of the power supply switch detection circuit is connected between the high-frequency
transformer and the output
rectifier filter circuit, the other end of the power supply switch detection circuit is connected with the
control circuit, the power supply switch detection circuit acquires and provides a
switching signal, and the
control circuit performs
logic control according to the
switching signal provided by the power supply switch detection circuit to determine whether the discharge circuit is connected or not. According to the light-emitting
diode (LED) drive power supply device, energy on large
capacitance can be rapidly released, problems of
afterglow and efficiency loss caused by slow discharge are solved, when the LED drive power supply is in normal operation, a load
resistor is in a non-operating state, and thereby the influence on the work efficiency of the LED drive power supply is absent.