Power supply circuit with two power conversion circuits
AssigneeMurata Manufacturing Co., Ltd.
InventorKazuaki Mino
Life of this patent
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Abstract
A power supply circuit includes a transformer having a primary winding and secondary windings, a first power conversion circuit configured to convert a DC voltage into an AC voltage and output the AC voltage to the primary winding, a rectifying and smoothing circuit that is connected to the secondary winding and is configured to rectify and smooth an alternating current output from the secondary winding, and a second power conversion circuit configured to boost a direct current output from the rectifying and smoothing circuit and supply to a load a DC voltage lower than a rated voltage of the load set in advance.
Claims20
A power supply circuit comprising:
- a transformer comprising a primary winding and a secondary winding;
- a first power conversion circuit configured to convert a DC voltage into an AC voltage and output the AC voltage to the primary winding;
- a rectifying and smoothing circuit configured to rectify and smooth an AC voltage output from the secondary winding;
- a second power conversion circuit configured to boost a DC voltage output from the rectifying and smoothing circuit and supply to, a first load, a DC voltage lower than a rated voltage of the first load set in advance;
- and
- a controller configured to:
- determine whether an input voltage of the second power conversion circuit falls within a first reference voltage range set in advance, and
- control the first power conversion circuit,
- wherein, when the controller is configured to determine that the input voltage of the second power conversion circuit is greater than or equal to an upper limit of the first reference voltage range, the controller is configured to control the first power conversion circuit so as to reduce an output voltage of the second power conversion circuit, and
- when the controller is configured to determine that the input voltage of the second power conversion circuit is greater than or equal to the upper limit of the first reference voltage range after the control of the first power conversion circuit, the controller is configured to stop the first power conversion circuit.
Dependencies are inferred from the claim text.