Motor Drive Control and Operating Method Therefor

A motor drive control device comprising:

• a digital control section;
• a digital-to-analog converter having an input terminal;
• a driver output section having an input terminal and an output terminal;
• a drive current sensing amplifier having a gain;
• an analog-to-digital converter;
• an interface;
• and
• a computation section,
• wherein the output terminal of the driver output section can be coupled to a series coupling between a motor and a sensing resistor,
• wherein the drive current sensing amplifier generates a drive current analog sensing signal in response to a drive current flowing in the sensing resistor,
• wherein the analog-to-digital converter generates a drive current digital sensing signal in response to the drive current analog sensing signal generated by the drive current sensing amplifier,
• wherein the digital control section generates a digital drive voltage command signal, which is to be supplied to the input terminal of the digital-to-analog converter, in response to a digital drive current command value supplied from the interface and in response to the drive current digital sensing signal generated from the analog-to-digital converter,
• wherein the digital-to-analog converter generates an analog drive voltage command signal, which is to be supplied to the input terminal of the driver output section, in response to the digital drive voltage command signal supplied from the digital control section,
• wherein the driver output section generates a drive output signal, which drives the series coupling between the motor and the sensing resistor, in response to the analog drive voltage command signal generated from the digital-to-analog converter,
• wherein, in response to the digital drive current command value that is between a positive predetermined threshold voltage and a negative predetermined threshold voltage, the computation section generates an internal control signal to be in a first state, and exercises control so as to place the gain of the drive current sensing amplifier in a first state, and
• wherein, in response to the digital drive current command value that is not between the positive predetermined threshold voltage and the negative predetermined threshold voltage, the computation section generates the internal control signal to be in a second state, which is different from the first state, and exercises control so as to place the gain of the drive current sensing amplifier in a second state, which is lower than the first state.