| CPC H02M 1/0041 (2021.05) [H02M 1/0009 (2021.05); H02M 1/007 (2021.05)] | 10 Claims |
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1. An improved switching power converting apparatus (10) comprising:
a power converting circuit (102);
a sampling circuit (104) electrically connected to the power converting circuit (102);
a signal gain adjustment circuit (106) electrically connected to the sampling circuit (104);
a frequency limiting circuit (108) electrically connected to the signal gain adjustment circuit (106); and
a pulse width modulation controller (110) electrically connected to the power converting circuit (102) and the frequency limiting circuit (108),
wherein the sampling circuit (104) is configured to detect the power converting circuit (102) to obtain a sampled signal (Vs) and transmit the sampled signal (Vs) to the signal gain adjustment circuit (106); the signal gain adjustment circuit (106) is configured to adjust the sampled signal (Vs) to obtain a control signal (Vcon) and transmit the control signal (Vcon) to the frequency limiting circuit (108); the pulse width modulation controller (110) is configured to control an operating frequency of the pulse width modulation controller (110) based on the control signal (Vcon); the sampled signal (Vs) is obtained by detecting an output current (140) or an input current (158) by the sampling circuit (104).
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