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US 8,411,397 B2Granted
Power supply apparatus and method
AssigneeSony Corporation
InventorHiroshi Akama
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AssigneeSony Corporation
InventorHiroshi Akama
Estimating the term…
A power supply apparatus and method are provided. A conversion component outputs a first current having a predetermined phase region, an output component outputs a load voltage, a sense component senses a second current value, and a switch element allows current to flow in a first state and impedes current in a second state. The switch element changes between states based on a drive signal forcing the switch into the second state when the first current is in the predetermined phase region and the second current value exceeds a threshold indicating an overcurrent condition. A region determination circuit determines whether the first current is in the predetermined phase region and produces a phase region signal. An overcurrent detection circuit senses the second current value, determines whether it exceeds an overcurrent condition threshold, and produces an overcurrent signal. A protection circuit causes the drive circuit to switch the drive signal.
A power supply apparatus for converting an alternating current to a direct current, comprising:
A power supply apparatus for converting an alternating current to a direct current, comprising:
A method for converting an alternating current to a direct current for supplying power, comprising:
A method for converting an alternating current to a direct current for supplying power, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Details of apparatus for conversion: means for protecting converters other than automatic disconnection
Using semiconductor devices only: with automatic control of output voltage or current, e.g. switching regulators
Apparatus for conversion between ac and ac, between ac and dc, or
About 4 years 9 months of term left · ends 21 Jul 2031 (estimated)
The present application claims priority to Japanese Priority Patent Application JP 2009-170785 filed in the Japan Patent Office on Jul. 22, 2009, the entire content of which is hereby incorporated by reference.
The present disclosure relates to a power supply device that generates a stable direct current voltage by rectifying an alternating current, and in particular, to a power supply device having a PFC control circuit.
Power supply devices having a PFC (power factor correction) control IC (integrated circuit) can suppress occurrence of harmonics by improving the power factor. As such a power supply device, there is a power supply device described in Japanese Unexamined Patent Application Publication No. 11-164548.
FIG. 1 is a connection diagram illustrating an example of a power supply device of the past to which an embodiment of the present disclosure is applicable.
FIGS. 2A through 2C are waveform charts illustrating example signal waveforms in some parts of the power supply device of the past during normal operation.
FIGS. 3A through 3C are enlarged waveform charts of a partial section of FIG. 2B.
It should be noted that the embodiments described below are preferred specific examples of the present disclosure, and although various technically preferred limitations are imparted, the scope of embodiments of the present disclosure is not limited to these example embodiments as long as there is no particular description of limiting an embodiment of the present disclosure in the following description.
In order to facilitate understanding embodiments of the present disclosure, a description is given to one example of a power supply device having a PFC control circuit of a continuous current mode of the past to which an embodiment of the present disclosure is applicable with reference to FIG. 1. The continuous current mode is to control a switching element to be turned on/off with a drive pulse. A discontinuous current mode (called as a critical mode) is to detect zero current with a secondary winding provided in a choke coil and switch on/off of the switching element at zero current.
As illustrated in FIG. 1, a bridge rectifying circuit BD and a smoothing capacitor Ci rectify an alternating current voltage of an input alternating current power supply (e.g., commercial power supply) Vac to supply a full-wave rectified voltage to the smoothing capacitor Ci. An input (direct current) voltage Vin is outputted to both ends of the smoothing capacitor Ci.