Title:
ISOLATED POWER CONVERTER HAVING PRIMARY FEEDBACK CONTROL
Document Type and Number:
WIPO Patent Application WO2001037411
Kind Code:
A3
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.
Inventors:
TELEFUS MARK D
Application Number:
PCT/US2000/031318
Publication Date:
November 01, 2001
Filing Date:
November 13, 2000
Export Citation:
Assignee:
IWATT (US)
International Classes:
H02M3/337; (IPC1-7): H02M3/337
Domestic Patent References:
| WO1988009084A1 | 1988-11-17 |
Foreign References:
| US4251857A | 1981-02-17 | |||
| EP0944162A1 | 1999-09-22 | |||
| US5982644A | 1999-11-09 |
Other References:
JORDAN M ET AL: "RESONANT FLUORESCENT LAMP CONVERTER PROVIDES EFFICIENT AND COMPACT SOLUTION", PROCEEDINGS OF THE ANNUAL APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC),US,NEW YORK, IEEE, vol. CONF. 8, 7 March 1993 (1993-03-07), pages 424 - 431, XP000357925, ISBN: 0-7803-0983-9
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