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1. (WO2001037411) ISOLATED POWER CONVERTER HAVING PRIMARY FEEDBACK CONTROL

Pub. No.:    WO/2001/037411    International Application No.:    PCT/US2000/031318
Publication Date: Sat May 26 01:59:59 CEST 2001 International Filing Date: Tue Nov 14 00:59:59 CET 2000
IPC: H02M 3/337
Applicants: IWATT
Inventors: TELEFUS, Mark, D.
Title: ISOLATED POWER CONVERTER HAVING PRIMARY FEEDBACK CONTROL
Abstract:
The present invention comprises an isolated dual power supply having an internal feedback loop. The dual power supply comprises power converter responsive to an error signal for generating a DC internal regulated output voltage coupled to a DC/AC switching power converter having a transformer. The primary winding of the transformer is coupled to the DC internal output voltage and to one or more power switches. A control circuit drives the one or more power switches such that an alternating current having substantially a constant duty cycle flows through the primary winding. An error amplifier produces a control signal proportional to the difference of an output voltage at a load coupled to the secondary winding and a reference voltage equal to the maximum expected voltage losses at the load. The error signal is formed from a combination of the control signal and a signal proportional to the internal voltage output.