HV starting circuit for AC-DC converter
A high-voltage start-up and converter technology, which is applied to output power conversion devices, conversion equipment with intermediate conversion to AC, instruments, etc., can solve the problems of prolonged start-up response time, etc., to overcome power loss, improve efficiency, and system stability Effect
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[0048]Referring to FIG. 2 , it is a high-voltage starting circuit diagram of an AC-DC converter according to a specific embodiment of the present invention. As shown in the figure, the high-voltage AC is rectified by the rectifier bridge to convert the sinusoidal signal into a pulsating DC signal, and then filtered by the filter capacitor Chv to obtain a smoother high-voltage DC signal, which provides the starting high-voltage HV. The high-voltage AC input range is between 64V and 264V, and the obtained DC high voltage range is between 30V and 500V. The starting high voltage HV is directly connected to the pin HV of the PWM control IC through a wire to provide the starting current Istartup. Through the PWM control IC internal circuit opening and closing action, the system completes the startup, and automatically closes the leakage path from the startup high voltage HV to the ground, and the startup current Istartup becomes 0. The pin VCC of the PWM control IC is grounded thro...
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