Controlled d-c power supply

Details Controlled d-c power supply Controlled d-c power supply

H - Electricity

02

M

321/24, 321/98

H02M 7/145 (2006.01) H02M 7/162 (2006.01)

Patent

CA 1158718

079177-BWE CONTROLLED D-C POWER SUPPLY 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 re- gulating 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.

358526

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