Inverter system

Patent metadata

Field	Value
Publication number	US-2016268948-A1
Application number	US-201615064390-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Mar 10, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

An inverter system is provided. In the inverter system according to the present disclosure, adjacently arranged four switching elements among U phase and V phase switching elements configured in an NPC/H bridge manner are converted to an ON state to bypass a voltage applied from a DC link capacitor.

First claim

1 . An inverter system forming a phase voltage of a motor by serially connecting a plurality of power cells, the power celling including:
a rectifying unit configured to rectify an applied AC voltage to a DC voltage; a DC link capacitor; an inverter unit including first to fourth switching elements, each serially connected to form a U phase; and fifth to eighth switching elements serially connected to form a V phase, wherein the switching elements are arranged in an NPC (Neutral Point Clamped)/H bridge by a plurality of diodes to synthesize a DC link voltage of the DC link capacitor to an AC voltage having a predetermined voltage and frequency by ON or OFF of each of the plurality of switching elements; and a controller configured to bypass an output voltage of the inverter unit by controlling the ON or OFF of the plurality of switching elements.

2 . The inverter system of claim 1 , wherein the controller bypasses an output voltage applied from the DC link capacitor by turning on the first, second, fifth and sixth switching elements.

3 . The inverter system of claim 1 , wherein the controller bypasses an output voltage applied from the DC link capacitor by turning on the second, third, sixth and seventh switching elements.

4 . The inverter system of claim 1 , wherein the controller bypasses an output voltage applied from the DC link capacitor by turning on the third, fourth, seventh and eighth switching elements.

5 . The inverter system of claim 1 , wherein the controller converts some of the plurality of switching elements to ON state in order to carry out a bypass operation in response to a fault-generated switching element by ascertaining a state of the plurality of switching elements when it is determined that a fault is generated on the power cell.

6 . The inverter system of claim 5 , wherein the controller bypasses an output voltage applied from the DC link capacitor by turning on the first, second, fifth and sixth switching elements when a fault is generated on any one of the third, fourth, seventh and eighth switching elements.

7 . The inverter system of claim 5 , wherein the controller bypasses an output voltage applied from the DC link capacitor by turning on the second, third, sixth and seventh switching elements when a fault is generated on any one of the first, fourth, fifth and eighth switching elements.

8 . The inverter system of claim 5 , wherein the controller bypasses an output voltage applied from the DC link capacitor by turning on the third, fourth, seventh and eighth switching elements when a fault is generated on any one of the first, second, fifth and sixth switching elements.

Assignees

• Lsis Co Ltd

Inventors

• Choi Seung Cheol
• Yoo Anno

Classifications

• H02H7/122

  for inverters, i.e. DC/AC converters · CPC title

• H02P27/06 Primary

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

• H02M7/4835

  comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage · CPC title

• H02M1/32 Primary

  Means for protecting converters other than automatic disconnection · CPC title

• H02M7/49

  Combination of the output voltage waveforms of a plurality of converters · CPC title