Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1991-10-01
1993-02-02
Voeltz, Emanuel T.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 48, 307 64, 307 80, 307 85, 363 65, 36443111, H02J 700, H02M 3335
Patent
active
051840251
ABSTRACT:
A computer-controlled, uninterruptible power supply system is disclosed. The system selectively operates from more than one input source of power, e.g. an AC line input, an external DC input and internal batteries. The system is of the type which utilizes one or more switch mode converters and is well suited for use in computer systems. The switch mode regulator has a PWM clock signal and provides a PWM drive signal. The PWM clock signal frequency is substantially greater than the PWM drive signal frequency. Transferring between the DC power sources is done in a manner substantially transparent to the regulator and the load, generally as follows. A signal indicating a transfer to a selected one of the DC power sources is gated in response to the PWM clock signal to form a first logic signal that is synchronized to the PWM clock signal. The first logic signal is gated in response to the PWM drive signal so as to form a second logic signal that is further synchronized to the PWM drive signal. Finally, the PWM drive signal is gated to a selected switching circuit responsive to the second logic signal, so that transfers between the DC power sources are fully synchronized to the PWM clock signal and to the PWM drive signal.
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Arnold Hagiwara, Powertechnics Magazine (Apr. 1988) The Benefits of Active Power Factor Correction.
Boekelheide Karl
Ellison George A.
Hocker Robert A.
Kellogg James R.
McCurry Patrick W.
Elegant Design Solutions Inc.
Voeltz Emanuel T.
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