US 9,287,775 B2Granted

Power supply device and lighting device

AssigneeSharp Kabushiki Kaisha

InventorRyohhei Tada

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Abstract

A power supply device is provided with the following: a rectifier circuit that rectifies an alternating voltage from an alternating current source; a booster circuit that boosts the voltage after rectification, and generates an input side voltage of a voltage conversion unit; the voltage conversion unit that outputs a voltage required for reducing the input side voltage and supplying the input side voltage to a light source; a voltage current detection unit that determines whether or not the light source is connected; and an output voltage control unit that, if it is determined that a first resistor and a second resistor, which are connected in parallel with respect to the light source, and the light source are not connected, controls the voltage of the first resistor so that the voltage is no more than a prescribed value.

Claims14

Dependent claims

A power supply device, comprising:

a first resistor which is connected in parallel between output terminals;
a determination unit configured to determine whether or not a load is connected between the output terminals;
a second resistor which is connected to the first resistor in series;
a voltage conversion unit configured to convert an input side voltage into a required voltage and output the voltage to the output terminals;
a driving unit configured to drive the voltage conversion unit,
wherein the driving unit stops the driving of the voltage conversion unit when the determination unit determines that the load is not connected;
an output voltage control unit which divides the input side voltage by the first resistor and the second resistor that powers the driving unit such that a voltage between the output terminals, when the load is not connected, is controlled to be lower than, a voltage between the output terminals in the case that the load is connected between the output terminals, when the driving unit stops the driving of the voltage conversion unit.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/237,124Filed 10 Aug 2012
Priority: JP 2011-17708112 Aug 2011
Published: US 2014/0306621 A116 Oct 2014
Granted: 15 Mar 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H02M 3/156
Using semiconductor devices only: with automatic control of output voltage or current, e.g. switching regulators
H05B 45/38
Switched mode power supply [SMPS]: using boost topology
H02M 1/32
Details of apparatus for conversion: means for protecting converters other than automatic disconnection
Y02B 20/30
Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps: semiconductor lamps, e.g. solid state lamps [SSL] light…