Title:
RECTIFICATION CIRCUIT AND POWER SOURCE USING SAME
Document Type and Number:
WIPO Patent Application WO/2023/047694
Kind Code:
A1
Abstract:
The present invention provides a rectification circuit which uses a switching element such as a MOSFET to perform synchronous rectification, and which can reduce the capacitance of a capacitor that supplies power to a drive circuit of the switching element for synchronous rectification. This rectification circuit has an anode and cathode, and is provided with: a first switching element in which a first terminal is connected to the cathode of the rectification circuit and a second terminal is connected to the anode of the rectification circuit; a first diode in which a cathode is connected to the first terminal and an anode is connected to the second terminal; a second switching element in which a third terminal is connected to the first terminal; a second diode in which an anode is connected to a fourth terminal of the second switching element; a first capacitor in which a positive electrode terminal is connected to a cathode of the second diode and a negative electrode terminal is connected to the second terminal; a comparator which detects the voltage between the fourth terminal and the second terminal and supplies power from the first capacitor; a gate driver in which an input terminal is connected to an output terminal of the comparator and an output terminal is connected to a fifth terminal, of the first switching element, for controlling the first switching element, and which controls the first switching element on the basis of an output signal of the comparator; and a control circuit which is connected to a sixth terminal, of the second switching element, which inputs a signal which controls the second switching element, wherein the control circuit controls the second switching element so as to continuously be ON and controls the voltage between the fourth terminal and the sixth terminal of the second switching element such that the voltage of the first capacitor does not exceed a prescribed target voltage, thereby controlling the current flowing to the fourth terminal from the third terminal of the second switching element.
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Inventors:
MIWA YOSHIHIRO (JP)
SHOJI HIROYUKI (JP)
SAKANO JUNICHI (JP)
UTSUMI TOMOYUKI (JP)
HIGUCHI TAKAHIRO (JP)
SHOJI HIROYUKI (JP)
SAKANO JUNICHI (JP)
UTSUMI TOMOYUKI (JP)
HIGUCHI TAKAHIRO (JP)
Application Number:
PCT/JP2022/019765
Publication Date:
March 30, 2023
Filing Date:
May 10, 2022
Export Citation:
Assignee:
HITACHI POWER SEMICONDUCTOR DEVICE LTD (JP)
International Classes:
H02M7/21; H02M1/08; H02M7/12
Domestic Patent References:
| WO2020189317A1 | 2020-09-24 |
Foreign References:
| JP2018088725A | 2018-06-07 | |||
| JP2015111969A | 2015-06-18 | |||
| JP2001037221A | 2001-02-09 | |||
| JP2021520774A | 2021-08-19 | |||
| US20170179846A1 | 2017-06-22 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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