MOTOR CONTROL APPARATUS HAVING FUNCTION OF DISCHARGING ENERGY REMAINING IN DC LINK
First Claim
1. A motor control apparatus comprising:
- a PWM rectifier configured to convert AC power on a three-phase AC input power supply side into DC power, or which converts DC power on a DC output side into AC power;
a smoothing capacitor which is provided in a DC link on the DC output side of the PWM rectifier;
a DC voltage detection unit configured to detect a DC voltage of the smoothing capacitor;
an LCL filter which is connected to the AC input power supply side of the PWM rectifier;
a power disconnection unit which is connected to an AC power supply side of the LCL filter; and
a control unit configured to apply, when power is disconnected by the power disconnection unit, electric current to the LCL filter by controlling the PWM rectifier, and lowers the DC voltage to a desired value by discharging energy stored in the smoothing capacitor.
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Accused Products
Abstract
A motor control apparatus includes a PWM rectifier which converts AC power on a three-phase AC input power supply side into DC power or which converts DC power on a DC output side into AC power, a smoothing capacitor which is connected to a DC link on the DC output side of the PWM rectifier, a DC voltage detection unit which detects a DC voltage of the smoothing capacitor, an LCL filter which is connected to the AC input power supply side of the PWM rectifier, a power disconnection unit which is connected to an AC power supply side of the LCL filter, and a control unit which applies, when power is disconnected by the power disconnection unit, electric current to the LCL filter by controlling the PWM rectifier, and lowers the DC voltage to a desired value by discharging energy stored in the smoothing capacitor.
41 Citations
2 Claims
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1. A motor control apparatus comprising:
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a PWM rectifier configured to convert AC power on a three-phase AC input power supply side into DC power, or which converts DC power on a DC output side into AC power; a smoothing capacitor which is provided in a DC link on the DC output side of the PWM rectifier; a DC voltage detection unit configured to detect a DC voltage of the smoothing capacitor; an LCL filter which is connected to the AC input power supply side of the PWM rectifier; a power disconnection unit which is connected to an AC power supply side of the LCL filter; and a control unit configured to apply, when power is disconnected by the power disconnection unit, electric current to the LCL filter by controlling the PWM rectifier, and lowers the DC voltage to a desired value by discharging energy stored in the smoothing capacitor. - View Dependent Claims (2)
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Specification