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US 2018/0123580 A1Published application
Coupling structure of gate driver in power supply device
AssigneeFairchild Korea Semiconductor Ltd.
InventorsTaesung KIM, Seunguk YANG, Inki PARK
Life of this patent
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Abstract
A power supply device includes a power switch that is switched according to a gate voltage. A sense resistor receives a switch current that flows through the power switch to develop a sense voltage. A peak of a primary-side current is detected from the sense voltage. The gate driver has a pair of switches for generating the gate voltage in
Claims20
A power supply device comprising:
- a power switch that is configured to be switched to generate an output voltage of the power supply device;
- a sense resistor having a first end and a second end, the first end of the sense resistor being connected to a first electrode of the power switch, the second end of the sense resistor being connected to a primary-side ground, wherein a switch current that flows through the power switch develops a sense voltage on the sense resistor;
- a gate driver that is configured to generate a drive signal for switching the power switch, the gate driver comprising a high-side switch and a low-side switch, the low-side switch having a first electrode that is connected to the first electrode of the power switch and to the first end of the sense resistor to receive the sense voltage, the low-side switch having a second electrode that is connected to a control electrode of the power switch, the high-side switch and the low-side switch being configured to be switched according to a control signal that is generated based on the sense voltage.
An integrated circuit (IC) chip for providing switch control of a power supply, the IC chip comprising:
- a first pin that is configured to output a gate drive signal for controlling a switching operation of a power switch;
- a second pin that is configured to receive a sense voltage developed on a sense resistor;
- a gate driver comprising a first transistor and a second transistor that are switched according to a pulse width modulation (PWM) signal to generate the gate drive signal at the first pin, the first transistor having a first electrode that is connected to the second pin;
- and
- a PWM controller that is configured to generate the PWM signal based on a peak of a primary-side current detected from the sense voltage received at the second pin.
2 more elements
A method of operating a primary-side regulation (PSR) power supply device, the method comprising:
- flowing a switch current through a power switch and to a sense resistor;
- developing a sense voltage on the sense resistor;
- detecting a peak of a primary-side current of the power supply device from the sense voltage;
- generating a control signal based on the detected peak of the primary-side current;
- turning on the power switch in accordance with the control signal by turning off a low-side switch and turning on a high-side switch to assert a gate drive signal to the power switch;
- turning off the power switch in accordance with the control signal by turning on the low-side switch and turning off the high-side switch to de-assert the gate drive signal to the power switch;
- and
- when the low-side switch is turned on, decreasing a gate voltage of the power switch by flowing a sink current from a gate of the power switch to the low-side switch.
5 more elements
Dependencies are inferred from the claim text.