CPC H03L 7/08 (2013.01) | 11 Claims |
1. A frequency-locked circuit for a variable frequency topology, which is configured to trigger a Pulse Width Modulation (PWM) controller to lock a frequency of a driving signal outputted by the PWM controller, the frequency-locked circuit for the variable frequency topology comprising:
an AC wave generating circuit receiving and converting the driving signal to generate an AC wave signal; and
a comparator electrically connected to the AC wave generating circuit and receiving the AC wave signal, wherein the comparator compares the AC wave signal with a reference signal to generate a comparison output signal;
wherein in response to determining that the AC wave signal is greater than the reference signal, the comparison output signal triggers the PWM controller to convert the driving signal from one voltage level to another voltage level so as to lock the frequency, and the one voltage level is different from the another voltage level.
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