Motor control system and semiconductor device
AssigneeRenesas Electronics Corporation
InventorsTakuro Nishikawa, Takao Koike, Shinya Abe
Life of this patent
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Abstract
A motor control system includes a first MCU and a second MCU. The first MCU includes an error detection unit, a resolver digital converter, and a first PWM generation unit. The resolver digital converter includes an encoder unit, which generates encoder pulses based on angle information and outputs the encoder pulses to the second MCU. The error detection unit outputs an error signal to the second MCU, when an error is detected in the first MCU. The first MCU controls the resolver digital converter to operate using a backup clock supplied from the second MCU.
Claims15
A motor control system comprising:
- a first MCU (Micro Controller Unit);
- and
- a second MCU,
- wherein the first MCU includes
- an error detection unit,
- a resolver digital converter which generates angle information based on a sine wave signal and a cosine wave signal which are output from a resolver, and
- a first PWM generation unit which generates a first PWM (Pulse Width Modulation) signal based on the angle information,
- wherein the resolver digital converter includes an encoder unit, wherein the encoder unit generates encoder pulses based on the angle information and outputs the encoder pulses to the second MCU,
- wherein the second MCU includes
- a backup clock supply unit,
- an encoder counter unit which restores the angle information from the encoder pulses, and
- a second PWM generation unit which generates a second PWM signal based on the angle information,
- wherein the error detection unit outputs an error signal to the second MCU, when an error is detected in the first MCU,
- wherein the backup clock supply unit supplies a backup clock to the first MCU, when the error signal has been received, and
- wherein the first MCU controls the resolver digital converter to operate using the backup clock.
A semiconductor device comprising:
- an error detection unit;
- a resolver digital converter which generates angle information based on a sine wave signal and a cosine wave signal output from a resolver;
- and
- a PWM generation unit which generates a PWM (Pulse Width Modulation) signal based on the angle information,
- wherein the resolver digital converter includes an encoder unit, wherein the encoder unit generates encoder pulses based on the angle information and outputs the encoder pulses to another semiconductor device,
- wherein the error detection unit outputs an error signal to the another semiconductor device, when an error is detected in the semiconductor device,
- wherein when a clock in the semiconductor device is not supplied to the resolver digital converter, the resolver digital converter operates using a backup clock supplied from the another semiconductor device via a backup control unit of the semiconductor device,
- wherein the resolver digital converter, the error detection unit, and the backup control unit are supplied with a power supply voltage from a first power supply unit and a second power supply unit.
Dependencies are inferred from the claim text.