Patent ID: 8289098

Claim:
A gate pulse modulation circuit adapted for being subjected to the control of a sloping control signal to generate a sloped voltage signal according to a gate power supply voltage and a first predetermined voltage and then output the sloped voltage signal through an output terminal of the gate pulse modulation circuit for the use of gate pulse modulation, the gate pulse modulation circuit comprising: a voltage modulation circuit, electrically coupled between the gate power supply voltage and a second predetermined voltage and subjected to the control of the sloped control signal to perform a sloping operation in a frequency period of the sloping control signal, and thereby the output terminal of the gate pulse modulation circuit outputs the sloped voltage signal; and a comparator control circuit, comprising: a comparing unit, comprising a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is electrically coupled to a node in the voltage modulation circuit, and the second input terminal is electrically coupled to the first predetermined voltage; and a first switching unit, comprising a first passage terminal, a second passage terminal and a control terminal, the first passage terminal of the first switching unit is electrically coupled to the first predetermined voltage, the second passage terminal of the first switching unit is electrically coupled to the output terminal of the gate pulse modulation circuit, and the control terminal of the first switching unit is electrically coupled to the output terminal of the comparing unit; wherein during the voltage modulation circuit performing the sloping operation, a relative magnitude relationship between a voltage on the node and the first predetermined voltage decides on-off states of the first switching unit, and thereby decides the moment of the first predetermined voltage being delivered to the output terminal of the gate pulse modulation circuit.