초록 ▼

A motor control circuit is disclosed, which uses one hall sensor to sense the position of the magnetic poles of three-phase motor, and to execute phase switching mechanism by start controller and operation controller. The motor control circuit drives the three-phase motor from a start state to a nor

A motor control circuit is disclosed, which uses one hall sensor to sense the position of the magnetic poles of three-phase motor, and to execute phase switching mechanism by start controller and operation controller. The motor control circuit drives the three-phase motor from a start state to a normal operation state. In the start state, the start controller controls the switching time and controls storage to transmit the digital models of the phase switching to the operation controller. The operation controller executes the phase switching of the full-bridge circuit according to the received digital models, to drive the three-phase motor. In the normal operation state, the start controller stops transmitting the digital models of the phase switching to the operation controller. The operation controller captures six digital models in sequence once every switching time, and executes the phase switching of the full-bridge circuit, to drive the three-phase motor.

대표청구항 ▼

1. A motor control circuit, adapted for driving a three-phase motor from a start state to a normal operation state, and the motor control circuit comprising: a full-bridge circuit, electrically connected to the three-phase motor;a hall sensor, configured close to the three-phase motor, and configure

1. A motor control circuit, adapted for driving a three-phase motor from a start state to a normal operation state, and the motor control circuit comprising: a full-bridge circuit, electrically connected to the three-phase motor;a hall sensor, configured close to the three-phase motor, and configured for sensing a position of magnetic poles of the three-phase motor to generate a hall signal;a storage, electrically connected to the hall sensor and configured for storing six digital models, the six digital models having sequential relationship and being associated with a phase switching of the full-bridge circuit, to provide the operation of the three-phase motor;a start controller, electrically connected to the hall sensor and the storage; andan operation controller, electrically connected to the hall sensor, the storage, and the full-bridge circuit;wherein in the start state, when the start controller receives a start signal indicating start of the motor control circuit, the start controller periodically generates a commutation signal, the storage transmits the digital models in sequence to the operation controller starting from the first digital model according to the level of the commutation signal and the level of the hall signal, and the operation controller executes the phase switching of the full-bridge circuit according to the digital models received in sequence, to drive the three-phase motor;wherein in the start state, when the start controller determines that there is a first level conversion of the hall signal, the start controller periodically generates the commutation signal, the storage transmits the fourth, the fifth, and the sixth digital models in sequence to the operation controller according to the commutation signal and the level conversion, and the operation controller executes the phase switching of the full-bridge circuit according to the digital models received in sequence, to drive the three-phase motor;wherein in the start state, when the start controller determines that there is the second level conversion of the hall signal, the operation controller averages a total time of the fourth, the fifth, and the sixth digital models to generate a switching time, and to enter the normal operation state, wherein in the normal operation state, the operation controller captures six digital models in sequence from the storage once every switching time, and executes the phase switching of the full-bridge circuit according to the switching time. 2. The motor control circuit according to claim 1, wherein the start controller comprises: an oscillator, having a terminal, the terminal electrically connected to an external element, the oscillator configured for generating a charge-discharge signal from the terminal according to the external element, and configured for transforming the charge-discharge signal into an oscillating clock signal; anda counter, electrically connected to the oscillator, wherein the counter keeps counting the clock signal in the start state, and when the counter counts a predefined frequency periodically, the counter generates the commutation signal to the storage. 3. The motor control circuit according to claim 2, wherein when the counter determines that there is the second level conversion of the hall signal, the counter stops generating the commutation signal to the storage. 4. The motor control circuit according to claim 2, wherein the oscillator comprises: a charge-discharge circuit, having a charging element and a discharging element, the terminal configured between the charging element and the discharging element, and the charge-discharge circuit charges or discharges the external element through the terminal, to generate the charge-discharge signal from the terminal; anda clock generator, electrically connected to the charge-discharge circuit, and receiving the charge-discharge signal, to generate the clock signal. 5. The motor control circuit according to claim 2, wherein the external element is one or a combination of a capacitor and a resistor. 6. The motor control circuit according to claim 1, wherein the first level conversion of the hall signal indicates that the hall signal is transformed from a low level to a high level, and the second level conversion of the hall signal indicates that the hall signal is transformed from the high level to the low level. 7. The motor control circuit according to claim 1, wherein the first level conversion of the hall signal indicates that the hall signal is transformed from a high level to a low level, and the second level conversion of the hall signal indicates that the hall signal is transformed from the low level to the high level. 8. A motor control circuit, adapted for driving a three-phase motor from a start state to a normal operation state, and the motor control circuit comprising: a full-bridge circuit, electrically connected to the three-phase motor;a hall sensor, configured close to the three-phase motor, and configured for sensing a position of magnetic poles of the three-phase motor to generate a hall signal;a storage, electrically connected to the hall sensor and configured for storing six digital models, the six digital models having sequential relationship and being associated with a phase switching of the full-bridge circuit, to provide the operation of the three-phase motor;a start controller, electrically connected to the hall sensor and the storage; andan operation controller, electrically connected to the hall sensor, the storage, and the full-bridge circuit;wherein in the start state, when the start controller receives a start signal indicating start of the motor control circuit, the start controller periodically generates a commutation signal, the storage transmits the digital models in sequence to the operation controller starting from the fourth digital model according to the level of the commutation signal and the level of the hall signal, and the operation controller executes the phase switching of the full-bridge circuit according to the digital models received in sequence, to drive the three-phase motor;wherein in the start state, when the start controller determines that there is a first level conversion of the hall signal, the start controller periodically generates the commutation signal, the storage transmits the first, the second, and the third digital models in sequence to the operation controller according to the commutation signal and the level conversion, and the operation controller executes the phase switching of the full-bridge circuit according to the digital models received in sequence, to drive the three-phase motor;wherein in the start state, when the start controller determines that there is the second level conversion of the hall signal, the operation controller averages a total time of the first, the second, and the third digital models to generate a switching time, and to enter the normal operation state, wherein in the normal operation state, the operation controller captures six digital models in sequence from the storage once every switching time, and executes the phase switching of the full-bridge circuit according to the switching time. 9. The motor control circuit according to claim 8, wherein the start controller comprises: an oscillator, having a terminal, the terminal electrically connected to an external element, the oscillator configured for generating a charge-discharge signal from the terminal according to the external element, and configured for transforming the charge-discharge signal into an oscillating clock signal; anda counter, electrically connected to the oscillator, wherein the counter keeps counting the clock signal in the start state, when the counter counts a predefined frequency periodically, the counter generates the commutation signal to the storage, and when the counter determines that there is the second level conversion of the hall signal, the counter stops generating the commutation signal to the storage. 10. The motor control circuit according to claim 9, wherein the external element is one or a combination of a capacitor and a resistor.