Title:
POWER SUPPLY CIRCUIT, AND DEVICE INCLUDING POWER SUPPLY CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2024/101037
Kind Code:
A1
Abstract:
The present invention makes it possible to reduce the heat generated by a power supply circuit. The present invention is a power supply circuit comprising: a transformer that is insulated between a primary side and a secondary side; a step-up circuit that steps up a voltage on the secondary side of the transformer; an amplification circuit that amplifies the difference between a voltage based on an output voltage of the step-up circuit and a designated voltage that specifies the output voltage of the step-up circuit; an amplitude control circuit 150 that supplies a voltage based on an output voltage of the amplification circuit to the primary side of the transformer while limiting the maximum output current, and a transistor that turns a current on the primary side of the transformer on and off in accordance with a prescribed clock. The amplitude control circuit 150 is configured to comprise: a comparator CMP1 that modulates the pulse width of the output voltage of the amplification circuit; and a MOSFET M2, a diode D1, a coil L1, and a capacitor C1 that, by performing a switching action in accordance with a modulated wave output by the comparator CMP1, step down and output a power supply voltage.
Inventors:
IGARASHI YUTAKA (JP)
NISHIMOTO TAKUMA (JP)
LI WEN (JP)
NISHIMOTO TAKUMA (JP)
LI WEN (JP)
Application Number:
PCT/JP2023/036093
Publication Date:
May 16, 2024
Filing Date:
October 03, 2023
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02M3/28
Foreign References:
| JPH0564439A | 1993-03-12 | |||
| JP2020022228A | 2020-02-06 | |||
| JPH0622550A | 1994-01-28 | |||
| JP2021526788A | 2021-10-07 |
Attorney, Agent or Firm:
WILLFORT INTERNATIONAL PATENT FIRM (JP)
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