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US 2019/0296632 A1Published application
Waveform shaping circuit, semiconductor device, and switching power supply device
AssigneeFujitsu Limited
InventorTatsuya Hirose
Life of this patent
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Abstract
A waveform shaping circuit includes a first variable gate voltage circuit that controls a minimum voltage of a pulse voltage based on a drain current or a source current of a field effect transistor, the pulse voltage having a positive or negative value and being applied to a gate of the field effect transistor, and a second variable gate voltage circuit that controls a maximum voltage of the pulse voltage based on the drain current or the source current.
Claims5
A waveform shaping circuit comprising:
- a first variable gate voltage circuit that controls a minimum voltage of a pulse voltage based on a drain current or a source current of a field effect transistor, the pulse voltage having a positive or negative value and being applied to a gate of the field effect transistor;
- and
- a second variable gate voltage circuit that controls a maximum voltage of the pulse voltage based on the drain current or the source current.
A semiconductor device comprising:
- a field effect transistor;
- and
- a waveform shaping circuit that includes a first variable gate voltage circuit that controls a minimum voltage of a pulse voltage based on a drain current or a source current of the field effect transistor, the pulse voltage having a positive or negative value and being applied to a gate of the field effect transistor, and a second variable gate voltage circuit that controls a maximum voltage of the pulse voltage based on the drain current or the source current.
A switching power supply device comprising:
- a field effect transistor that outputs a pulse-like AC signal by a switching operation;
- a control circuit that outputs a control signal which is a pulse voltage that controls the switching operation of the field effect transistor;
- and
- a waveform shaping circuit including a first variable gate voltage circuit that controls a minimum voltage of the control signal based on a drain current or a source current of the field effect transistor, the control signal having a positive or negative value and being applied to a gate of the field effect transistor, and a second variable gate voltage circuit that controls a maximum voltage of the control signal based on the drain current or the source current.
1 more element
Dependencies are inferred from the claim text.