Patent ID: 7327203
Filing Date: 2008-02-05
Classification: B60Q,H03K

Abstract:
1. PWM signal generation circuit for generating a PWM signal, comprising: a comparator comprising: a voltage-dividing circuit for providing a voltage signal to the first input terminal of the comparator, an RC serial circuit connected in parallel to the voltage-dividing circuit, the RC serial circuit comprising: wherein the RC serial circuit provides a second voltage to the second input terminal of the comparator, wherein the second voltage depends on an amount of charge in the capacitor; a first feedback line for feeding back an output of the comparator to the first input terminal side; and a second line that connects the output of the comparator to the second input terminal side through a diode and a third resistor, wherein a discharged current from the capacitor flows into the output side of the comparator through the second line, and wherein the diode blocks a current flow from the output side of the comparator toward the second input terminal.