BRUSHLESS MOTOR DRIVE DEVICE
First Claim
1. A brushless motor drive device for driving a brushless motor, the brushless motor drive device comprising:
- an inverter circuit configured to energize and drive a winding of the brushless motor;
a current detection circuit configured to detect a current value of the winding;
a control unit configured to control rotation of the brushless motor; and
a resistor-capacitor (RC) filter including a resistor and a capacitor,wherein the control unit includes;
a drive control unit configured to generate a signal to drive the inverter;
a clock generation circuit configured to generate a clock pulse to be used as a reference for an operation period;
a pulse output circuit configured to generate a pulse signal with a changing frequency based on the clock pulse and to apply the pulse signal to the RC filter;
an analog-digital (AD) converter circuit connected to the capacitor of the RC filter and the current detection circuit; and
an AD-conversion-error calculation unit configured to calculate a conversion error of the AD converter circuit, the AD-conversion-error calculation unit calculating the conversion error based on a difference between an output value of the AD converter circuit produced in response to an input of a voltage of the capacitor and an AD-converted value calculated from a charging time of the capacitor.
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Accused Products
Abstract
A brushless motor drive device includes the following: an inverter circuit configured to energize and drive the winding of a brushless motor; a current detection circuit configured to detect the current value of the winding; a control unit configured to control the rotation of the motor; and an RC filter including a resistor and a capacitor. The control unit includes the following: a drive control unit configured to generate a signal to drive the inverter; a clock generation circuit configured to generate a clock pulse to be used as a reference for an operation period; a pulse output circuit configured to generate a pulse signal with a changing frequency based on the clock pulse and to apply the pulse signal to the RC filter; an AD converter circuit connected to the capacitor of the RC filter and the current detection circuit; and an AD-conversion-error calculation unit configured to calculate the conversion error of the AD converter circuit. The AD-conversion-error calculation unit calculates the conversion error based on the difference between the output value of the AD converter circuit produced in response to an input of the voltage of the capacitor and an AD-converted value calculated from the charging time of the capacitor.
8 Citations
8 Claims
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1. A brushless motor drive device for driving a brushless motor, the brushless motor drive device comprising:
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an inverter circuit configured to energize and drive a winding of the brushless motor; a current detection circuit configured to detect a current value of the winding; a control unit configured to control rotation of the brushless motor; and a resistor-capacitor (RC) filter including a resistor and a capacitor, wherein the control unit includes; a drive control unit configured to generate a signal to drive the inverter; a clock generation circuit configured to generate a clock pulse to be used as a reference for an operation period; a pulse output circuit configured to generate a pulse signal with a changing frequency based on the clock pulse and to apply the pulse signal to the RC filter; an analog-digital (AD) converter circuit connected to the capacitor of the RC filter and the current detection circuit; and an AD-conversion-error calculation unit configured to calculate a conversion error of the AD converter circuit, the AD-conversion-error calculation unit calculating the conversion error based on a difference between an output value of the AD converter circuit produced in response to an input of a voltage of the capacitor and an AD-converted value calculated from a charging time of the capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification