Circuit for decreasing an electromagnetic interference of a PWM pulse modulation signal
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United States of America Patent
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Nov 14, 2017
Issued Date -
N/A
app pub date -
Sep 11, 2015
filing date -
Aug 12, 2015
priority date (Note) -
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Abstract
A circuit of decreasing an electromagnetic interference of PWM pulse modulation signal has: a load detecting circuit used to output a mode detection signal to a control circuit according to a current generated by a load when the load connected to the load detecting circuit is detected; the control circuit connected to the load detecting circuit and outputting a voltage control signal to a resistance-adjustment circuit according to the mode detection signal; the resistance-adjustment circuit connected to the control circuit, adjusting a resistance of a driving resistor of the resistance-adjustment circuit and further adjusting a driving frequency of a pulse generating circuit; and the pulse generating circuit connected to the resistance-adjustment circuit and outputting a PWM pulse modulation signal according to the adjusted driving frequency. Under the heavy loading mode, the driving frequency of the PWM pulse modulation signal is adjusted so the electromagnetic interference is decreased effectively.
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