Constant voltage circuit and a stabilized power supply unit

Details Constant voltage circuit and a stabilized power supply unit Constant voltage circuit and a stabilized power supply unit

1994-04-29

1996-05-21

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323207, 363132, 363 26, G05F 170, G05F 1565

Patent

active

055193064

ABSTRACT:
A DC constant voltage circuit comprises a rectifier and a boosting chopper circuit controlled by a general purpose PWM control IC. The general purpose PWM control IC receives a reference voltage Vref which regulates the output voltage by pulse width modulation and produces a voltage having the same waveform and phase as the input current to improve the power factor of the output voltage. An AC constant voltage circuit comprises a common line connecting an AC input terminal and an output terminal, positive and negative boosting chopper circuits for boosting and chopping a half-wave rectified respectively in both positive and negative sides into a DC voltage and a DC-AC inverter for inverting the DC voltage into the AC output voltage. The positive and negative boosting chopper circuits are used as a filter for improving the power factor and adjusting the waveform and phase of the output voltage to be the same as the sine full waveform of the input voltage.

REFERENCES:
patent: 4823247 (1989-04-01), Tamoto

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