Controlled D-C power supply

Details Controlled D-C power supply Controlled D-C power supply

1979-09-12

1982-02-09

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

318809, H02P 1326

Patent

active

043153054

ABSTRACT:
By controlling the phase angle at which conduction occurs in the SCR's in an SCR rectifier bridge, a d-c voltage of adjustable magnitude may be produced from a-c line voltage applied to the bridge. The specific angle at which the SCR's are fired into conduction during each half cycle of the a-c line voltage is determined by comparing a ramp-shaped pulse, produced from the line voltage during each half cycle, with an error signal which varies as a function of the difference between the desired d-c magnitude and the actual amplitude of the d-c voltage. The d-c power supply is made immune to line voltage variations by regulating the ramp-shaped pulses so that they always have the same pulse width regardless of line voltage amplitude, thereby facilitating precise control over the d-c magnitude.

REFERENCES:
patent: 3320512 (1967-05-01), Kruger
patent: 3443120 (1969-05-01), Thiele
patent: 3518527 (1970-06-01), Russell
patent: 3783367 (1974-01-01), Yamamoto et al.

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