Title:
DC POWER SUPPLY DEVICE, POWER CONVERSION DEVICE, AND REFRIGERATION CYCLE DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/183553
Kind Code:
A1
Abstract:
This DC power supply device (50) comprises: a rectifier circuit (3) which includes a plurality of MOSFETs each having a parasitic diode therein, the plurality of MOSFETs being bridge-connected, and which is connected to an AC power supply (1) via a reactor (2); a capacitor (4) connected between output terminals of the rectifier circuit (3); a power supply voltage zero cross detection circuit (7) which detects the polarity of a power supply voltage which is an output voltage of the AC power supply (1); and a direct current detection circuit (9) which detects a first current flowing through the rectifier circuit (3). The control unit (11) has a first operation mode in which synchronous rectification is performed to turn on the MOSFET at a timing when a current flows in the same direction as the parasitic diode, and a second operation mode in which the MOSFET is PWM-controlled to boost the voltage across the capacitor (4), activates the first operation mode during low power consumption, and activates the second operation mode during high power consumption.
Inventors:
KASHIMA MITSUO (JP)
SHINOMOTO YOSUKE (JP)
SHINOMOTO YOSUKE (JP)
Application Number:
PCT/JP2019/009535
Publication Date:
September 17, 2020
Filing Date:
March 08, 2019
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02M7/12; H02M7/21
Foreign References:
| JP2008172905A | 2008-07-24 | |||
| JP2014090583A | 2014-05-15 | |||
| JP2017042003A | 2017-02-23 |
Attorney, Agent or Firm:
TAKAMURA, Jun (JP)
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