Apparatus for controlling inverter

Patent metadata

Field	Value
Publication number	US-10298155-B2
Application number	US-201715847232-A
Country	US
Kind code	B2
Filing date	Dec 19, 2017
Priority date	Feb 1, 2017
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

Disclosed herein is an apparatus for controlling an inverter. The apparatus controls a braking resistor connected in parallel with a DC link capacitor to switch to an ON or OFF state based on at least one of the temperature and the DC link voltage of the braking resistor.

First claim

What is claimed is:

1. An apparatus for controlling an inverter in an inverter system including a converter unit for converting a mains electricity power into a direct current (DC) voltage, a DC link capacitor for storing the DC voltage, and an inverter unit for converting the DC voltage into an alternating current (AC) voltage having a predetermined frequency, the apparatus comprising:
a braking resistor connected in parallel with the DC link capacitor;
a switching unit having an ON state or an OFF state, wherein when the switching unit is in the ON state, the DC voltage stored in the DC link capacitor is consumed by the braking resistor; and
a controller for transmitting a control signal to switch the switching unit to the ON state or the OFF state based on at least one of a temperature and DC link voltage of the braking resistor,
wherein, when the DC link voltage reaches an ON reference voltage by a motor decelerating at a first speed reduction rate, the controller is configured to transmit a control signal to the switching unit to switch the switching unit to the ON state,
wherein, when the temperature of the braking resistor reaches an OFF reference temperature, the controller is configured to transmit a control signal to the switching unit to switch the switching unit to the OFF state, and
wherein, when the DC link voltage reaches the ON reference voltage, the controller is configured to control the inverter unit to adjust the motor to a third speed reduction rate lower than the first speed reduction rate and a second speed reduction rate to maintain the DC link voltage at the ON reference voltage.

2. The inverter control apparatus according to claim 1 , wherein the controller is configured to control the inverter unit such that the motor operates at the second speed reduction rate lower than the first speed reduction rate.

3. The apparatus according to claim 1 , wherein, when the temperature of the braking resistor reaches an ON reference temperature, the controller is configured to transmit a control signal to the switching unit to switch the switching unit to the ON state.

4. The apparatus according to claim 3 , wherein the controller is configured to control the inverter unit to decelerate the motor at the first speed reduction rate.

5. The apparatus according to claim 4 , wherein, when the DC link voltage reaches an OFF reference voltage, the controller is configured to transmit a control signal to the switching unit to switch the switching unit to the OFF state.

Assignees

• Lsis Co Ltd

Inventors

• Lee Sun-Woo

Classifications

• H02P3/22 Primary

  by short-circuit or resistive braking · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02M7/48

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• H02M7/5387

  in a bridge configuration · CPC title

• H02P29/68

  based on the temperature of a drive component or a semiconductor component · CPC title