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US 2003/0198066 A1Published application
Switching power supply
AssigneeOnkyo Corporation
InventorsJoji Kasai, Kazuhiro Hida, Hiroyuki Hirano
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AssigneeOnkyo Corporation
InventorsJoji Kasai, Kazuhiro Hida, Hiroyuki Hirano
Estimating the term…
In a switching power supply of the present invention, when a voltage output from start-up means is greater than a driving voltage produced by output means, the voltage from the start-up means is provided to control means, whereby the switching power supply can be started up reliably. Furthermore, when the voltage output from the start-up means is less than the driving voltage produced by the output means, the current path is blocked in the start-up means so that no voltage is provided to the control means from the start-up means, whereby it is possible to reduce the power consumption during the steady operation.
A switching power supply, comprising:
A switching power supply, comprising:
Dependencies are inferred from the claim text.
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Details of apparatus for conversion: means for starting or stopping converters
Details of control, feedback or regulation circuits: arrangements for supplying an adequate voltage to the control circuit of converters
Electricity: power supply or regulation systems: starting circuits
Apparatus for conversion between ac and ac, between ac and dc, or
Term end not estimated
1. Field of the Invention
The present invention relates to a switching power supply, and more particularly to a switching power supply that can be started up reliably and can operate at a reduced power consumption level during the steady operation.
2. Description of the Related Art
FIG. 1 is a block diagram illustrating a switching power supply according to a preferred embodiment of the present invention.
FIG. 2 is a waveform diagram illustrating an operation of a switching power supply of the present invention.
FIG. 3 is a waveform diagram illustrating an operation of a switching power supply of the present invention.
Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Note however that the present invention is not limited to the particular embodiments set forth below. FIG. 1 is a block diagram illustrating a switching power supply 1 according to a preferred embodiment of the present invention. The switching power supply 1 includes switching means 2, output means 3, control means 4, and start-up means 5. The switching power supply 1 further includes rectifying and smoothing means 6. Note that in the present embodiment, the term “startup” refers to a stage of operation when the driving voltage from the start-up means 5 is greater than that from the output means 3, and the term “steady operation” refers to another stage of operation when the driving voltage from the start-up means 5 is less than that from the output means 3.
The rectifying and smoothing means 6 rectifies and smoothes an AC power supply voltage input from the outside to output a DC voltage V1. The rectifying and smoothing means 6 includes a rectifier circuit 7 and a smoothing capacitor Cl, for example.
For example, the switching means 2 includes a switching circuit in which a plurality of switching elements are connected together in a half-bridge or full-bridge circuit configuration. The switching elements may typically be MOSFETs. The switching means 2 receives an external power supply (the DC voltage V1, which has been rectified and smoothed by the rectifying and smoothing means 6) through an external power supply line that is connected to the switching means 2, and the switching elements are turned ON/OFF by a control signal from the control means 4, to output a pulse. The output voltage from the switching means 2 is provided to a first coil section 9.