Electrically commutated motor driving device and control method thereof

Abstract

An electronically commutated motor driving module for driving a motor includes a voltage detector, an electronically commutated motor driver, a current detector, a voltage converter, and a controller. The voltage detector detects supply voltage to generate a voltage detection signal. The electronically commutated motor driver is supplied by the supply voltage to generate, according to an electronically commutated signal, an operating current for driving the motor. The current detector detects the operating current to generate a current detection signal. The voltage converter converts the supply voltage into an internal voltage. The controller is supplied by the internal voltage and generates the electronically commutated signal according to a plurality of control parameters. When the controller determines that a specific event has happened according to the control parameters, the controller stops generating the electronically commutated signal and then stores the control parameters.

What is claimed is: 
     
         1 . An electrically commutated motor driving device for driving a motor, comprising:
 a voltage detector, detecting a supply voltage to generate a voltage detection signal;   an electrically commutated motor driver, supplied by the supply voltage and generating an operating current according to an electrically commutated signal to drive the motor;   a current detector, detecting the operating current to generate a current detection signal;   a voltage converter, converting the supply voltage into an internal voltage; and   a controller, supplied by the internal voltage and generating the electrically commutated signal according to a plurality of control parameters, wherein when the controller determines, according to the control parameters, that a specific event has occurred, the controller first stops generating the electrically commutated signal and then stores the control parameters.   
     
     
         2 . The electrically commutated motor driving device of  claim 1 , wherein when the controller receives a shutdown instruction from a host, the controller first stops generating the electrically commutated signal and then stores the control parameters. 
     
     
         3 . The electrically commutated motor driving device of  claim 1 , further comprising:
 a storage device, configured to store the control parameters, wherein the storage device and the controller are physically separated, wherein the control parameters comprise a rotating-speed value of the motor, a current value of the operating current, and a voltage value of the supply voltage.   
     
     
         4 . The electrically commutated motor driving device of  claim 3 , wherein the specific event comprises a voltage abnormal event, a current abnormal event, and a rotating-speed abnormal event, wherein when the controller determines, according to the voltage signal, that the voltage value is outside a predetermined voltage range, the controller determines that the voltage abnormal event has occurred, wherein when the controller determines, according to the current signal, that the current value exceeds a threshold current, the controller determines that the current abnormal event has occurred, wherein when the controller determines, according to a rotating-speed detection signal, that the rotating-speed value is outside a predetermined range, the controller determines that the rotating-speed abnormal event has occurred, wherein the motor comprises a Hall device configured to detect the rotating-speed value to generate the rotating-speed detection signal. 
     
     
         5 . The electrically commutated motor driving device of  claim 4 , further comprising:
 an energy storage device, coupled to the internal voltage, wherein when the controller determines, according to the voltage signal, that the supply voltage is less than a predetermined voltage, the controller determines that the voltage abnormal event has occurred, wherein the energy storage device maintains the internal voltage for a predetermined period so that the controller stops generating the electrically commutated signal and stores the control parameters in the storage device in the predetermined period.   
     
     
         6 . The electrically commutated motor driving device of  claim 4 , wherein when the controller receives the control parameters from a host, the controller immediately writes the control parameters into the storage device and generates the electrically commutated signal according to the control parameters stored in the storage device, wherein a shutdown instruction is generated by the host. 
     
     
         7 . A control method for controlling an electrically commutated motor driver to drive a motor, comprising:
 supplying the electrically commutated motor driver with a supply voltage;   converting the supply voltage into an internal voltage;   generating an operating current according to the internal voltage and a plurality of control parameters to drive the motor;   determining, according to the control parameters, whether a specific event has occurred; and   when determining that the specific event has occurred, first stopping generating the operating current and then storing the control parameters.   
     
     
         8 . The control method of  claim 7 , wherein the control parameters are stored in a storage device, the storage device and the controller are physically separated, and the control parameters comprise a rotating-speed value of the motor, a current value of the operating current, and a voltage value of the supply voltage. 
     
     
         9 . The control method of  claim 8 , wherein the step of determining, according to the control parameters, whether a specific event has occurred further comprises:
 detecting the supply voltage to generate a voltage detection signal;   when determining, according to the voltage detection signal, that the voltage value is outside a predetermined voltage range, determining that a voltage abnormal event has occurred;   detecting the operating current to generate a current detection signal;   when determining, according to the current value, that the operating current exceeds a threshold current, determining that a voltage abnormal event has occurred;   receiving a rotating-speed detection signal, wherein the motor comprises a Hall device configured to measure the rotating-speed value to generate the rotating-speed detection signal; and   when determining, according to the rotating-speed detection signal, that the rotating-speed value is outside a predetermined range, determining that a rotating-speed abnormal event has occurred.   
     
     
         10 . The control method of  claim 9 , wherein in the step of determining that a voltage abnormal event has occurred based on the operating current exceeding the threshold current, the step further comprises:
 maintaining the internal voltage for a predetermined period by using an energy storage device; and   during the predetermined period, stopping generating the operating current and writing the control parameters into the storage device.   
     
     
         11 . The control method of  claim 1 , further comprising:
 receiving the control parameters from a host;   when the control parameters are received, immediately writing the control parameters into the storage device; and   generating the operating current according to the control parameters stored in the storage device.   
     
     
         12 . A control method for controlling an electrically commutated motor driver to drive a motor, comprising:
 supplying the electrically commutated motor driver with a supply voltage;   detecting the supply voltage to generate a voltage detection signal;   converting the supply voltage into an internal voltage;   controlling the electrically commutated motor driver according to the internal voltage and a plurality of control parameters so that the electrically commutated motor driver generates an operating current;   receiving a shutdown instruction from a host; and   when the shutdown instruction is received, first stopping controlling the electrically commutated motor driver and then storing the control parameters.