Circuit and method for improving efficiency by use of external inductor for temperature control
AssigneePotens Semiconductor Corp.
InventorsWen Nan Huang, Ching Kuo Chen, Shiu Hui Lee, Hsiang Chi Meng, Chih Ming Yu
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Abstract
A circuit and a method for improving efficiency by use of external inductor for temperature control, wherein the operating temperature of a field effect transistor is calculated by the inductor voltage. The change in operating temperature is used to adjust and control the voltage of the variable voltage gate drive module. When the operating temperature rises, the input voltage of the gate increases accordingly; when the operating temperature decreases, the input voltage of the gate decreases accordingly, thereby achieving the efficiency of regulating light and heavy loads.
Claims10
A circuit for improving efficiency by use of temperature control, electrically connected to a field effect transistor, comprising:
- an inductor electrically connected to a drain of the field effect transistor;
- a differential amplifier module connected in parallel with the inductor to capture a voltage signal of the inductor;
- a microprocessing unit connected to the differential amplifier module for converting the voltage signal in a current signal through integration, wherein the microprocessing unit calculates a power consumption of the field effect transistor and an operating temperature of the field effect transistor based on the power consumption;
- and
- a variable voltage gate drive module electrically connected to the microprocessing unit and a gate and a source of the field effect transistor for regulating an input voltage of the gate based on the operating temperature.
A method for improving efficiency by use of temperature control, electrically connected to a field effect transistor, comprising:
- connecting an inductor in parallel with a drain of a field effect transistor;
- capturing a voltage signal of the inductor through a differential amplifier module and sending it to a microprocessing unit;
- converting the voltage signal into a current signal through integration by use of the microprocessing unit, calculating a power consumption of the field effect transistor based on the current signal, and estimating an operating temperature of the field effect transistor based on the power consumption;
- and
- regulating an input voltage of a gate of the field effect transistor by a variable voltage gate drive module based on the operating temperature.
Dependencies are inferred from the claim text.