US 2010/0244910 A1Published application

Sinusoidal waveform generation circuit

AssigneeDenso Corporation

InventorsRyoji Kawaai, Hiroshi Ogura, Yukinori Harada

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Abstract

A sinusoidal waveform generation circuit is configured to continuously control a voltage applied to a gate of a MOSFET to change an output current in the form of a sinusoidal wave by utilizing, as an electric characteristic specific to the MOSFET, a characteristic between a voltage applied to a gate of a MOSFET and an output current. The waveform of the sinusoidal wave generated by the sinusoidal waveform generation circuit is not a combination of a plurality of linear lines but is continuous and smooth. As a result, noises generated by the sinusoidal waveform generation circuit can be reduced.

Claims7

Dependent claims

A sinusoidal waveform generation circuit for generating a sinusoidal waveform based on a waveform generation command inputted from an external side, the sinusoidal waveform generation, circuit comprising:

a MOSFET having a gate, a drain and a source and producing an output current from the drain to the source when a voltage is applied to the gate;
and
a gate voltage application section for applying the voltage to the gate of the MOSFET when the sinusoidal waveform generation command is inputted,
wherein the voltage application section is configured to change the output current in a form of a sinusoidal wave by continuously applying the voltage to the gate of the MOSFET based on an electric characteristic between a gate voltage and an output current in a MOSFET.

1 more element

Dependencies are inferred from the claim text.