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Patent Searching and Data


Title:
DC POWER SUPPLY DEVICE AND AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2019/082246
Kind Code:
A1
Abstract:
Provided are a DC power supply device and an air conditioner that are capable of protecting elements even when a power-supply voltage disturbance such as lightening surge occurs. A DC power supply device (1) is provided with: a bridge rectification circuit (10) in which bridge connection is made between rectification-side converter elements (Q3, Q4) and switching elements (Q1, Q2); a rector (L1) disposed between an AC power supply (Vs) and the bridge rectification circuit (10); a smoothing capacitor (C1) that is connected to the output side of the bridge rectification circuit (10) and smooths a voltage applied from the bridge rectification circuit (10); a zero cross determination unit (14) that determines a zero cross at which the polarity of the AC power supply (Vs) is switched between positive and negative; and a converter control unit (18) that executes a converter element protection operation for turning off the rectification-side converter elements (Q3, Q4) in the case where, after determination by the zero cross determination unit (14), a voltage opposite to the determined voltage has been detected.

Inventors:
KANBARA Eiji (INC. 16-1, Kaigan 1-chome, Minato-k, Tokyo 22, 〒1050022, JP)
HASHIMOTO Hiroyuki (INC. 16-1, Kaigan 1-chome, Minato-k, Tokyo 22, 〒1050022, JP)
TAMURA Kenji (INC. 16-1, Kaigan 1-chome, Minato-k, Tokyo 22, 〒1050022, JP)
ITO Masaki (INC. 16-1, Kaigan 1-chome, Minato-k, Tokyo 22, 〒1050022, JP)
Application Number:
JP2017/038216
Publication Date:
May 02, 2019
Filing Date:
October 23, 2017
Export Citation:
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Assignee:
HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. (16-1, Kaigan 1-chome Minato-k, Tokyo 22, 〒1050022, JP)
International Classes:
H02M7/12; H02M7/21
Foreign References:
JP2015139301A2015-07-30
JP2015061322A2015-03-30
JP2017055481A2017-03-16
JP2014090544A2014-05-15
JP2016046931A2016-04-04
Attorney, Agent or Firm:
ISONO INTERNATIONAL PATENT OFFICE, P.C. (Hulic Toranomon Building, 1-18 Toranomon 1-chome, Minato-k, Tokyo 01, 〒1050001, JP)
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