Motor drive device and integrated circuit device for motor driving
First Claim
1. A motor drive device comprising:
- a three-phase DC motor output stage comprising power elements which supply output voltages to three-phase coils, and a predriver which supplies drive voltages to the power elements,wherein lower hooks with a voltage minimum phase as a first source for supplying the output voltages to the three-phase coils and upper hooks with a voltage maximum phase as a second source higher than the first source are set as patterns alternately repeated for every electrical angle of 60 degrees, and every three phase pattern is expressed in the combination of linear functions to generate sine wave-like drive voltages and the drive voltages are produced by the patterns, thereby causing sine wave-like currents to flow into the three-phase coils, anda tilt setting register provided so as to be able to change the linear inclination of each drive voltage based on the combination of linear functions.
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Accused Products
Abstract
A three-phase DC motor output stage including a predriver that supplies drive voltages to power MOSFETs supplies output voltages to three-phase coils, monitors whether each of gate-to-source voltages of the power MOSFETs is greater than or equal to a predetermined voltage and thereby detects a current zero cross, and employs the output of such current zero cross detection in PLL control for controlling energization switching timing and thereby forms drive voltages of 180-degree energization. Lower hooks with a voltage minimum phase as GND and upper hooks with a voltage maximum phase as a source are set as patterns alternately repeated for every electrical angle of 60 degrees. The patterns are expressed in linear approximation to generate sine wave-like drive voltages, thereby causing sine wave-like currents to flow into the three-phase coils.
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Citations
5 Claims
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1. A motor drive device comprising:
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a three-phase DC motor output stage comprising power elements which supply output voltages to three-phase coils, and a predriver which supplies drive voltages to the power elements, wherein lower hooks with a voltage minimum phase as a first source for supplying the output voltages to the three-phase coils and upper hooks with a voltage maximum phase as a second source higher than the first source are set as patterns alternately repeated for every electrical angle of 60 degrees, and every three phase pattern is expressed in the combination of linear functions to generate sine wave-like drive voltages and the drive voltages are produced by the patterns, thereby causing sine wave-like currents to flow into the three-phase coils, and a tilt setting register provided so as to be able to change the linear inclination of each drive voltage based on the combination of linear functions. - View Dependent Claims (2, 3)
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4. The motor drive device comprising:
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a current detector which samples and holds a voltage generated at a shunt resistor provided between a common connecting terminal of the lower power elements and a circuit ground potential and amplifies the voltage; an analog-to-digital converter which converts a current included pulsating component detected by the current detector or a voltage that appears at a de-energized phase of three phases to a digital value; and a current control error detector which detects the difference between a converted output of the analog-to-digital converter and the expected value of the pulsating component superimposed on a dc current instruction signal, wherein pulse width modulation control of the output stage is performed by a signal outputted from the current control error detector. - View Dependent Claims (5)
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Specification