| 摘要 |
PROBLEM TO BE SOLVED: To provide an insulated converter, which excels in high-speed response, suitable for large-current output, and fitting for a synchronous rectifier circuit. SOLUTION: In a switching power supply device, which connects the serial circuit of the primary winding of a first transformer and a first switching element; connects the serial circuit of a first rectifier element and a first capacitor; and connects its load in parallel with the first capacitor, a first choke coil is serially inserted in the primary winding of the first transformer; a serial circuit of a second rectifier element, the tertiary winding of the first transformer and a second switching element is connected in parallel with the first choke coil; a serial circuit of the tertiary winding of a second transformer and a third switching element is connected in parallel with the serial circuit of the tertiary winding of the first transformer and the second switching element; a serial circuit of the primary winding of the second transformer and a fourth switching element is connected with the primary winding of the first transformer; and a serial circuit of the secondary winding of the second transformer and the third switching element is connected in parallel with the first capacitor.
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