Motor drive circuit having a resistor circuit for sine wave generation
AssigneeKabushiki Kaisha Toshiba
InventorShigeki Murai
Life of this patent
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Abstract
A motor drive circuit includes a voltage generator configured to form a basic wave for generating sine-wave currents, wherein the voltage generator includes a resistor circuit for generating a plurality of voltages, a timing circuit for sequentially selecting selected ones of the plurality of voltages generated by the resistor circuit, and a switch circuit, connected to the resistor circuit and under control of the timing circuit, for outputting the sequentially selected voltages as the basic wave. A triangular wave generator generates a triangular wave which is applied along with the basic wave generated by the voltage generator to a modulation circuit, and the modulation circuit generates a terminal voltage for generating a sine-wave current.
Claims18
A drive circuit comprising:
- a voltage generator configured to form a basic wave for generating sine-wave currents, including,
- a resistor circuit for generating a plurality of voltages,
- a timing circuit for sequentially selecting selected ones of the plurality of voltages generated by the resistor circuit, and
- a switch circuit, connected to the resistor circuit and under control of the timing circuit, for outputting the sequentially selected ones of the plurality of voltages as the basic wave;
- a triangular wave generator for generating a triangular wave;
- and
- a modulation circuit, which receives as inputs the basic wave outputted by the voltage generator and the triangular wave, for generating a terminal voltage for generating a sine-wave current.
Dependencies are inferred from the claim text.