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US 2006/0138973 A1Published application
Switching power supply device and method of controlling the switching device
AssigneeKabushiki Kaisha Toshiba
InventorHideki Hirosawa
Life of this patent
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Abstract
According to one embodiment, the switching power supply device comprises a DC-DC converter, an alternating current driver circuit, a smoothing capacitor and control circuitry. The control circuitry operates for adjusting a phase of an oscillation signal from the alternating current driver circuit to coincide start time points of current conducting periods between the output stage of the DC-DC converter and an input stage of the alternating current driver circuit.
Claims20
A switching power supply device comprising:
- a power converter;
- a first smoothing capacitor coupled to the power converter;
- a DC-DC converter including a converter transformer with a primary coil and a secondary coil, the primary coil being coupled to the power converter and the first smoothing capacitor;
- a second smoothing capacitor coupled to the secondary coil of the DC-DC converter;
- a synchronizing rectifier circuit coupled to the secondary coil of the DC-DC converter;
- an alternating current driver circuit;
- and
- control means for coordinating start time points of current conducting periods between (i) an output of the power converter and an input to the DC-DC converter to coincide with each other and (ii) an output of the DC-DC converter and an input of the alternating current driver circuit to coincide with each other.
5 more elements
A switching power supply device comprising:
- a DC-DC converter comprises a converter transformer including a primary coil operating as a portion of an input stage of the DC-DC converter and a secondary coil operating as a portion of an output stage of the DC-DC converter;
- an alternating current driver circuit including a first oscillator, the alternating current driver circuit being configured to receive an output voltage and to drive a load using a first oscillation signal from the first oscillator;
- a first smoothing capacitor positioned between the DC-DC converter and the alternating current driver circuit;
- and
- control means for adjusting a phase of the first oscillation signal to coincide start time points of current conducting periods between the output stage of the DC-DC converter and an input stage of the alternating current driver circuit.
2 more elements
A method comprising:
- switching a voltage at a primary side of a converter transformer of a DC-DC converter by a first switching element;
- smoothing and outputting the switched voltage by a first smoothing capacitor coupled to a secondary side of the converter transformer;
- carrying out synchronizing rectification by a second switching element and the first smoothing capacitor, the second switching element being provided on a secondary output line of the converter transformer;
- inputting an output voltage over the secondary output line to cause an alternating current driver circuit to drive a load, a level of the output voltage being controlled by controlling switching of the first switching element and the second switching element using a first oscillation signal from the oscillator;
- matching start time points of current conducting periods of the DC-DC converter and the alternating current driver circuit with the first smoothing capacitor interposed between the DC-DC converter and the alternating current driver circuit.
2 more elements
Dependencies are inferred from the claim text.