Patent ID: 9159450
Filing Date: 2015-10-13
Classification: G11C,H02M

Abstract:
1. A sampling circuit for sampling a reflected voltage of a transformer of a power converter, comprising: an amplifier circuit coupled to receive the reflected voltage for generating a first signal; a first capacitor generating a second signal in response to the reflected voltage; a first switch coupled between the reflected voltage and the first capacitor; and a sample-signal circuit generating a sample signal in response to the disabling of a switching signal, in which the switching signal is generated in accordance with a feedback signal for regulating an output of the power converter; wherein the feedback signal is generated in accordance with the second signal; the sample signal is utilized to control the first switch for sampling the reflected voltage; the sample signal is disabled once the first signal is lower than the second signal; the second signal compared with the first signal has a propagation delay.