Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1989-11-03
1990-12-04
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 21, 363 49, 363 97, H02M 3335
Patent
active
049758233
ABSTRACT:
A switched mode power supply operating with current mode regulation comprises an output switch coupled to a first winding of a transformer and to a source of input supply voltage. The switch is responsive to a control signal for initiating a pulse width modulated pulse voltage in a second winding of the transformer. A supply circuit coupled to the second winding generates an operating voltage. A feedback signal source monitors both current flowing through the first winding and the operating voltage. A control circuit coupled to the feedback signal source includes an oscillator for generating the control signal at a substantially constant frequency during normal operation and at a variable frequency during abnormal operation. The control circuit is responsive both to the current and to variations of the operating voltage over a regulating range, in a negative feedback loop. The control signal varies the on-time conduction of the output switch in each cycle to stabilize the operating voltage. The oscillator has a frequency control responsive to variations of the operating voltage outside of the regulating range, in a positive feedback loop. The on-time conduction of the output switch is limited to a maximum value by comparing the current to an error signal related to the operating voltage. The error signal varies when the operating voltage is within the regulating range but is limited in magnitude when the operating voltage falls below the regulating range. A DC feedback voltage forms a part of both the negative and positive feedback loops.
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Rilly Gerard
Rodriguez Jose
Deutsche Thomson-Brandt GmbH
Fried Harvey D.
Laks Joseph J.
Tripoli Joseph S.
Wong Peter S.
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