Patent ID: 11876453
Assignee: RICHTEK TECHNOLOGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A switching converter circuit which switches a terminal of an inductor between a first voltage and a second voltage according to a pulse width modulation (PWM) signal to convert an input power to an output power, the switching converter circuit comprising:
a high side metal oxide semiconductor field effect transistor (MOSFET) having an N-type conductivity type, and coupled between the first voltage and the terminal of the inductor;
a low side MOSFET having an N-type conductivity type, and coupled between the second voltage and the terminal of the inductor; and
a driver circuit including:
a high side driver, which generates a high side driving signal according to the PWM signal when the high side driver is enabled by a high side enable signal, so as to drive the high side MOSFET;
a low side driver, which generates a low side driving signal according to the PWM signal when the low side driver is enabled by a low side enable signal, so as to drive the low side MOSFET; and
a dead time control circuit, which generates a dead time signal according to an output current of the output power, to adaptively delay the low side driving signal or a signal which is in-phase with the low side driving signal, and/or to adaptively delay the high side driving signal or a signal which is in-phase with the high side driving signal, so as to adaptively control a dead time;

wherein the dead time is a period when the high side MOSFET and the low side MOSFET are both nonconductive;
wherein the dead time control circuit includes a sensor MOSFET having an N-type conductivity type, wherein a gate of the sensor MOSFET is coupled to a gate of the high side MOSFET or a gate of the low side MOSFET, wherein the sensor MOSFET generates the dead time signal at a sensor resistor according to a high side current flowing through the high side MOSFET or a low side current flowing through the low side MOSFET, wherein the sensor resistor is coupled to the sensor MOSFET in series.