Title:
LOAD ABNORMALITY DETECTING CIRCUIT FOR INVERTER AND INVERTER APPARATUS
Document Type and Number:
WIPO Patent Application WO/2019/106917
Kind Code:
A1
Abstract:
A load abnormality detecting circuit for an inverter to detect abnormality of a load during an operation of the inverter which has a switching element and a phase synchronizing loop controlling an output frequency to be a resonance frequency of the load, the load abnormality detecting circuit includes a phase shift detection part that detects a phase shift between an output voltage and an output current which are applied from the inverter to the load and sends an abnormal load signal based on the detected phase shift. The switching element including a self-arc-extinguishing element and a reflux diode connected in reversely parallel to the self-arc-extinguishing element. The phase shift detection part detects advance and delay of a phase of the output current with respect to the output voltage.
Inventors:
KANAI TAKAHIKO (JP)
Application Number:
PCT/JP2018/034516
Publication Date:
June 06, 2019
Filing Date:
September 18, 2018
Export Citation:
Assignee:
NETUREN CO LTD (JP)
International Classes:
H02M1/32; H02M7/539; H02H7/122; H02J50/12; H05B6/02
Foreign References:
| JP3419861B2 | 2003-06-23 | |||
| JP2015119583A | 2015-06-25 | |||
| JP2005276701A | 2005-10-06 | |||
| JPH11235044A | 1999-08-27 | |||
| JP3652098B2 | 2005-05-25 |
Attorney, Agent or Firm:
KOH-EI PATENT FIRM, P.C. (JP)
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