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Content Provider | IEEE Xplore Digital Library |
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Author | Cooke, P. |
Copyright Year | 1996 |
Description | Author affiliation: Unitrode Corp., Merrimack, NH, USA (Cooke, P.) |
Abstract | The output VI characteristics of most high frequency buck-derived PWM power converters exhibit a current tail during fault conditions. A current tail is actually an increase in the average output current as the output voltage decreases toward zero. Ideally, the controller's peak current limit function should prevent the average output current from exceeding a specified limit. In reality, the tail is due to the turn-off propagation delay inherent in the controller and in the power switch. Here, a frequency foldback scheme is proposed to reduce the effects of the propagation delay during an output overload or fault condition. Frequency foldback refers to decreasing the PWM's oscillator frequency during short circuit or overload conditions and allows the duty cycle to decrease below the value normally limited by the total propagation delay. |
Starting Page | 749 |
Ending Page | 755 |
File Size | 735790 |
Page Count | 7 |
File Format | |
ISBN | 0780335074 |
DOI | 10.1109/INTLEC.1996.573419 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 1996-10-06 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Voltage control Frequency Circuits Protection Pulse width modulation converters Pulse width modulation Switches Propagation delay Inductors Tail |
Content Type | Text |
Resource Type | Article |
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