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US 2012/0236604 A1Published application
Flyback converter with leading edge blanking mechanism
AssigneeAmpower Technology Co., Ltd.
InventorsCHIH-CHAN GER, TSUNG-LIANG HUNG, YUN-BING WANG
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Abstract
A flyback converter having a leading edge blanking (LEB) element keeps detecting whether or not primary-side current of the flyback converter reaches a predetermined threshold, beyond which the flyback converter could be damaged, in a predetermined LEB time corresponding to a leading edge of primary-side current. The flyback converter is turned off when the primary-side current exceeds the predetermined threshold.
Claims12
A flyback converter, comprising:
- a transformer comprising a primary winding;
- a switch;
- a sampler, wherein the primary winding is electrically connected to an external power source through the switch and the sampler when the switch is turned on, the sampler configured for sampling current flowing through the primary winding and generating a sample signal corresponding to the current;
- and
- a pulse width modulation (PWM) controller connected to the switch and configured for generating a PWM signal configured to turn the switch on and off, the PWM controller being configured for detecting whether or not the sample signal reaches a first predetermined threshold in a predetermined leading edge blanking (LEB) time corresponding to a leading edge of the sample signal and turning off the switch if the sample signal reaches the first predetermined threshold, the PWM controller being further configured for detecting whether or not the sample signal reaches a second predetermined threshold after the predetermined LEB time and turning off the switch if the sample signal reaches the second predetermined threshold.
2 more elements
Dependencies are inferred from the claim text.