Motor drive inverter control apparatus
First Claim
1. A motor drive inverter control apparatus comprising:
- a rectifier circuit for rectifying an AC power supply;
an inverter circuit driven by an output from the rectifier circuit;
a motor driven by an output from the inverter circuit;
a first capacitor coupled in parallel to the output of the rectifier circuit;
a second capacitor coupled in parallel to the first capacitor via a diode;
a control power supply circuit coupled in parallel to the second capacitor; and
a control circuit, driven by the control power supply circuit, for controlling the inverter circuit,wherein the first capacitor has a capacity that provides an input voltage to the inverter circuit having a ripple content greater than or equal to 90% over a range of use of the motor, andregenerative energy produced by the motor is absorbed by the first and the second capacitors.
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Accused Products
Abstract
A motor drive inverter control apparatus includes a rectifier circuit for rectifying an AC power supply, an inverter circuit driven by an output from the rectifier circuit, a motor driven by an output from the inverter circuit, a first capacitor coupled in parallel to the output of the rectifier circuit, and a second capacitor coupled in parallel to the first capacitor via a diode. The second capacitor has capacitance not less than three times that of the first capacitor. Although the second capacitor shows a ripple content not less than 90% during practical use, it well absorbs regenerative energy produced by the motor. As a result, elements of the apparatus can be prevented from degrading caused by an over-voltage, and the apparatus can be downsized and reduced its cost.
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Citations
13 Claims
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1. A motor drive inverter control apparatus comprising:
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a rectifier circuit for rectifying an AC power supply; an inverter circuit driven by an output from the rectifier circuit; a motor driven by an output from the inverter circuit; a first capacitor coupled in parallel to the output of the rectifier circuit; a second capacitor coupled in parallel to the first capacitor via a diode; a control power supply circuit coupled in parallel to the second capacitor; and a control circuit, driven by the control power supply circuit, for controlling the inverter circuit, wherein the first capacitor has a capacity that provides an input voltage to the inverter circuit having a ripple content greater than or equal to 90% over a range of use of the motor, and regenerative energy produced by the motor is absorbed by the first and the second capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification