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Power supply device

A technology of power supply device and AC power supply, which is applied in the direction of electric light source, lighting device, electroluminescent light source, etc., to achieve the effect of high power factor

Inactive Publication Date: 2013-01-09
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the conventional power supply device has the problem of increasing its size in order to obtain a high power factor.

Method used

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Embodiment Construction

[0046] The power supply device of this embodiment includes: a rectification circuit for rectifying an AC power supply; a first capacitor for smoothing the rectified voltage; and a step-down chopper circuit for supplying power to a load. The first capacitor is set to have a capacity in the interval in which the smoothed voltage drops to the output voltage output to the load within a half cycle of rectifying the AC power supply. The step-down chopper circuit includes at least one switching element and a second capacitor, and as the smoothed voltage is input to the at least one switching element, the at least one switching element operates in a range where the smoothed voltage exceeds the output voltage , and stop the operation in the interval where the smoothed voltage is the output voltage, the second capacitor is arranged on the output side and has a capacity greater than that of the first capacitor.

[0047] According to the power supply device of the present embodiment, the ...

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Abstract

According to one embodiment, a power supply device includes a rectifying circuit configured to rectify an alternating-current power supply, a first capacitor configured to smooth a voltage after rectification, and a falling voltage chopper circuit configured to supply electric power to a load. The first capacitor is set to a capacity in which a section where a voltage after smoothing drops to an output voltage to the load is provided in a rectified half period of the alternating-current power supply. The falling Voltage chopper circuit includes at least one switching element configured to receive an input of the voltage after smoothing, operate in a section where the voltage after smoothing exceeds the output voltage, and pause in a section of the output voltage and a second capacitor provided on an output side and having a capacity larger than the capacity of the first capacitor.

Description

technical field [0001] Embodiments of the present invention relate to a power supply device that drives a load. Background technique [0002] Conventionally, for example, in a power supply device using a light emitting diode (Light Emitting Diode, LED) element as a load, the AC voltage of the AC power supply is converted into a DC voltage, and then the DC voltage is output between both ends of the LED element, so that the The LED element lights up. [0003] In the power supply device using the LED element as a load as described above, it is necessary to improve the power factor (power factor) in order to reduce the power capacity (VOLT-AMP, VA). In order to obtain a high power factor, for example, a power supply device using a power supply circuit of a flyback system has been proposed, but the components of the power supply device are relatively large. [0004] Therefore, conventional power supply devices have a problem of increasing in size in order to obtain a high power...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M1/42H05B44/00
CPCH02M7/2176H05B33/0815H02M1/4208H05B45/38H05B45/355H05B45/3725
Inventor 加藤刚平松拓朗坂井健治片野慈子武长拓志清水智章
Owner TOSHIBA LIGHTING & TECH CORP
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