초록 ▼

Embodiments of present invention may provide a motor control drive circuit for driving a motor by receiving signals from a digital signal control device. The motor control drive circuit includes a switching unit receiving signals that have undergone pulse width modulation (PWM signals) in the digita

Embodiments of present invention may provide a motor control drive circuit for driving a motor by receiving signals from a digital signal control device. The motor control drive circuit includes a switching unit receiving signals that have undergone pulse width modulation (PWM signals) in the digital signal control device, and converting a switching state based on the input signals; and a controller receiving from the switching unit switching operational signals that vary according to a duty ratio of the PWM signals, receiving digital signals from the digital signal control device, and varying a voltage gain for control of the drive motor. In the motor control drive circuit of one embodiment of the present invention, motor rotation is controlled by the duty ratio of digital signals without the use of a DAC. This allows for the design of an independent digital signal processing device, and enables compatibility with various digital signal processing devices.

대표청구항 ▼

1. A motor control drive circuit for controlling a motor comprising:a signal converter adapted to generate a switching state signal responsive to a first received digital signal having undergone pulse width modulation in a digital signal control device; and a controller adapted to generate a voltage

1. A motor control drive circuit for controlling a motor comprising:a signal converter adapted to generate a switching state signal responsive to a first received digital signal having undergone pulse width modulation in a digital signal control device; and a controller adapted to generate a voltage responsive to a duty cycle ratio of the switching state signal by adjusting by a variable gain in response to a second received digital signal from the digital signal control device, thereby controlling a rotation of the motor. 2. The motor control drive circuit of claim 1, whereinthe signal converter is adapted to generate a first and a second switching states responsive to a high and a low state respectively in the first received digital signal; the controller comprises a first switchable current source and a second switchable current source coupled at a common node, first switchable current source comprising a first switch and a first current source in series with the first switch, the second switchable current source comprising a second switch and a second current source in series with the second switch; and the signal converter controls the first and second switches to conduct in response to the first and second switching states respectively, and the first switchable current source supplies electric charge into the common node whenever the first switch is conducting and the second switchable current source sinks electric charge from the common node whenever the second switch is conducting. 3. The motor control drive circuit of claim 2, wherein the controller further comprises:a current source controller for varying an intensity of the first and second current sources according to a signal state of the second received digital signal; a capacitor coupled to the common node, the capacitor being alternately charged by the first current source and discharged by the second current source; and a signal adjusting resistor having a first end coupled to a reference voltage source and a second end coupled to the common node. 4. The motor control drive circuit of claim 1, wherein the controller determines a voltage output to the motor according to a duty cycle ratio of the first received digital signal, and further wherein the controller adjusts a voltage gain according to the second received digital signal.5. The motor control drive circuit of claim 3, wherein the capacitor is charged to cause in the voltage applied to the motor to be a maximum whenever the circuit is in a first operating state having the duty cycle ratio of the first received digital signal selected from a list consisting of 100% and 0%, and wherein the capacitor is discharged to cause in the voltage applied to the motor to be a minimum whenever the circuit is in a second operating state having the duty cycle ratio of the first received digital signal selected from a list consisting of 100% and 0% and wherein the first and second operating states are mutually distinct.6. The motor control drive circuit of claim 2, wherein the controller controls the first and second switches to a condition selected from a list consisting of both conducting and both non-conducting, in response to a high impedance state of the first received digital signal, thereby maintaining the voltage at the common node at a reference voltage.7. A motor control drive circuit for driving a motor comprising:a digital signal controller outputting a first digital signal having pulse undergone width modulation and further having a duty cycle ratio; a pulse width modulation decoder receiving the first digital signal and a second digital signal, the decoder varying a gain of a drive voltage in response to the second digital signal, the drive voltage being applied to the motor, the pulse width modulation decoder further controlling a rotation of the motor according to the duty cycle ratio, wherein the pulse width modulation decoder comprises: a signal converter receiving the first digital signal and generating a switching state signal based on the first digital signal, wherein the signal converter is adapted to receive the first digital signal, and adapted to generate the switching state signal having a first and a second switching state according to whether first digital signal is in a high or a low state respectively; a controller receiving the switching state signal and the second digital signal, and varying a voltage gain to control the rotation of the motor, wherein the controller comprises a first switchable current source and a second switchable current source coupled at a common node, first switchable current source comprising a first switch and a first current source in series with the first switch, the second switchable current source comprising a second switch and a second current source in series with the second switch; and wherein the signal converter controls the first and second switches to conduct in response to the first and second switching states respectively, the first switchable current source supplies electric charge into the common node whenever the first switch is conducting and the second switchable current source sinks electric charge from the common node whenever the second switch is conducting; a current source controller for varying an intensity of the first current source and of the second current source according to the second digital signal; and a signal adjusting resistor, one end of the signal adjusting resistor coupled to an external reference voltage source and a second end of the signal adjusting resistor coupled to the common node, the signal adjusting resistor adjusting an intensity of a voltage applied to the capacitor. 8. A motor control drive circuit for driving a motor comprising:a digital signal controller outputting a first digital signal having pulse undergone width modulation and further having a duty cycle ratio; and a pulse width modulation decoder receiving the first digital signal and a second digital signal, the decoder varying a gain of a drive voltage in response to the second digital signal, the drive voltage being applied to the motor, the pulse width modulation decoder further controlling a rotation of the motor according to the duty cycle ratio, wherein the pulse width modulation decoder comprises: a signal converter receiving the first digital signal and generating a switching state signal based on the first digital signal; and a controller receiving the switching state signal and the second digital signal, and varying a voltage gain to control the rotation of the motor; wherein the pulse width modulation decoder controls a first switch and a second switch to a condition selected from a list consisting of both conducting and both non-conducting in response to a high impedance state of the first received digital signal, thereby maintaining the voltage at the common node a reference voltage. 9. A motor control drive circuit comprisingmeans for generating a digital signal having pulse width modulation and further having a duty cycle ratio; means for generating a DC level having a monotonic relationship to the duty cycle ratio; means for amplifying the DC level; and means for adjusting a gain of the means for amplifying in response to a second digital signal. 10. The motor control drive circuit of claim 9 wherein the monotonic relationship is a linear relationship.