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US 2019/0058424 A1Published application
Rotor position detection system
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorTamotsu Ito
Life of this patent
Estimating the term…
Abstract
A rotor position detection system according to one embodiment includes a H bridge circuit, a current detection circuit, a time measurement circuit, a zero cross determination circuit, and a rotor position calculation circuit. The zero cross determination circuit calculates a zero cross position of the induced voltage of the motor based on a difference time calculated by the time measurement circuit. The rotor position calculation circuit calculates a rotor position of the motor based on the zero cross position of the induced voltage.
Claims17
A rotor position detection system comprising:
- an H bridge circuit having first and second high side transistors to control a direction and conduction of a current flowing through a coil of a motor, the first and second high side transistors being provided between a power supply and the motor, and first and second low side transistors provided between the motor and a ground potential;
- a current detection circuit configured to detect a current flowing from the motor to the first low side transistor or the second low side transistor when the first and second high side transistors are turned off and the first and second low side transistors are turned on, and convert a detected current into a voltage;
- a time measurement circuit configured to measure a first time until the detection voltage detected by the current detection circuit becomes lower than a first reference voltage, and a second time until the detection voltage becomes lower than a second reference voltage smaller than the first reference voltage, and calculate a difference time between the first time and the second time;
- a zero cross determination circuit configured to calculate a zero cross position of an induced voltage of the motor based on the difference time;
- and
- a rotor position calculation circuit configured to calculate a rotor position of the motor based on a zero cross position of the induced voltage.
3 more elements
A rotor position detection system comprising:
- an H bridge circuit having first and second high side transistors to control a direction and conduction of a current flowing through a coil of a motor, the first and second high side transistors being provided between a power supply and the motor, and first and second low side transistors provided between the motor and a ground potential;
- an induced voltage detection circuit configured to detect an induced voltage generated at the motor;
- a current detection circuit configured to detect a current flowing from the motor to the first low side transistor or the second low side transistor when the first and second high side transistors are turned off and the first and second low side transistors are turned on, and convert a detected current into a voltage;
- a time measurement circuit configured to measure a first time until the detection voltage detected by the current detection circuit becomes lower than a first reference voltage, and a second time until the detection voltage becomes lower than a second reference voltage smaller than the first reference voltage, and calculate a difference time between the first time and the second time;
- and
- a step-out state detection circuit configured to detect a step-out state of the motor based on the induced voltage detected by the induced voltage detection circuit and the difference time calculated by the time measurement circuit.
3 more elements
A rotor position detection system comprising:
- an H bridge circuit having first and second high side transistors to control a direction and conduction of a current flowing through a coil of a motor, the first and second high side transistors being provided between a power supply and the motor, and first and second low side transistors provided between the motor and a ground potential;
- an induced voltage detection circuit configured to detect an induced voltage generated at the motor;
- a current measurement circuit configured to measure a first current flowing from the motor to the first low side transistor or a second current flowing from the motor to the second low side transistor when the first and second high side transistors are turned off and the first and second low side transistors are turned on;
- and
- a rotor position calculation circuit configured to calculate a rotor position of the motor based on a current value of the first current or the second current and the induced voltage.
2 more elements
Dependencies are inferred from the claim text.