The circuit of ac to dc power supply is a circuit that converts sine wave alternating current into direct current. If the input signal is not a sine wave, but a triangular wave or a sine wave with relatively large distortion, the relationship between the average value and the effective value is 1.11 times. Therefore, the measurement error will be relatively large. In this case, the average value is not used, but it is directly converted into the effective value of AC and then converted into DC. AC to dc power supply is the conversion circuit of AC effective value and DC. It is mainly used Used in signal measurement equipment.

Display and its ac to dc power supply converter. The display includes a lamp tube and an ac to dc power supply converter. The ac to dc power supply converter includes a pulse width modulation unit, a DC to DC conversion unit and a self-oscillating circuit. The pulse width modulation unit is used to output a PWM signal, and the pulse width of the PWM signal is determined according to the level signal. The ac to dc power supply conversion unit receives the first direct current voltage and converts it into a second direct current voltage, wherein the level of the second direct current voltage is determined by the PWM signal. The self-oscillating circuit generates an AC voltage to the lamp tube according to the second DC voltage. The DC/AC converter can determine the output AC voltage level through the level signal. When the DC/AC converter is operating in burst mode, the level signal is interleaved high level and low level, so that the output AC voltage It is burst type.

The circuit that the inverter power supply converts direct current into alternating current is called an inverter circuit. Under certain circumstances, the same set of thyristor converter circuit can be used for both rectification and inversion.