SWITCHING FREQUENCY SYNCHRONIZATION CIRCUIT, METHOD THEREFOR AND SWITCHING POWER SUPPLY
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United States of America Patent
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Issued Date -
Sep 19, 2024
app pub date -
Mar 12, 2024
filing date -
Mar 17, 2023
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Abstract
The present application discloses a switching frequency synchronization circuit, a method therefor and a switching power supply. By comparing peak values of a second charging voltage signal which represents an internal clock signal and a first charging voltage signal which represents an external clock signal, it is determined whether the frequency of the external clock signal meets the requirement for frequency synchronization. In a case that the frequency meets the requirement, the second charging voltage signal is reset by the external clock signal to synchronize the frequency of the internal clock signal with the frequency of the external clock signal. The present disclosure does not need a complex phase-locked loop circuit, and adjust an internal clock frequency by simple voltage comparison and synchronization mode. The control circuit is simplified and the overall system cost is reduced.
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