Power Supply Device and Luminair

A power supply device and voltage source technology, applied in lighting devices, electric light sources, electroluminescent light sources, etc., can solve problems such as rectifier damage, power switch contact welding, etc., and achieve the effect of preventing inrush current.

Inactive Publication Date: 2015-03-25
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, problems such as damage to the rectifier and welding of the contacts of the power switch may occur.

Method used

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  • Power Supply Device and Luminair
  • Power Supply Device and Luminair
  • Power Supply Device and Luminair

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0057] figure 1 It is a circuit diagram illustrating an illumination device including the power supply device of the first embodiment.

[0058] The lighting device 1 includes a power supply device 4 , a DC-DC converter 5 , and a lighting load 6 .

[0059] The power supply device 4 rectifies and smoothes the AC power supply voltage input through the power switch 3 . The DC-DC converter 5 converts the output of the power supply device 4 into a required voltage, and supplies it to the lighting load 6 .

[0060] The lighting load 6 has, for example, lighting light sources such as light emitting diodes (LEDs). The AC power supply 2 is, for example, a commercial power supply.

[0061] The power supply device 4 includes a rectifier 7 , a normally-on transistor 8 , a smoothing capacitor 13 , a resistor 9 , a resistor 12 , a constant-voltage diode 10 , and a capacitor 11 . The rectifier is, for example, a diode bridge rectifier. The normally-on transistor is a high electron mobili...

no. 2 approach

[0079] A second embodiment will be described.

[0080] Figure 4 It is a circuit diagram illustrating an illumination device including the power supply device of the second embodiment.

[0081] Figure 4 The lighting device 18 includes a power supply device 19 , a DC-DC converter 5 , and a lighting load 6 .

[0082] The power supply device 19 includes a rectifier 7 , a normally-on transistor 8 , and a smoothing capacitor 13 .

[0083] The drain of the normally-on transistor 8 is connected to the high-potential output terminal 23 of the rectifier 7 , and the source of the normally-on transistor 8 is connected to one end of the smoothing capacitor 13 . The other end of the smoothing capacitor 13 is connected to the low potential output terminal 24 of the rectifier 7 . The gate of the normally-on transistor 8 is connected to the source of the normally-on transistor 8 . The output of the power supply unit 4 is taken out from both ends of the smoothing capacitor 13 .

[0084]...

no. 3 approach

[0088] A third embodiment will be described.

[0089] Figure 5 It is a circuit diagram illustrating an illumination device including the power supply device of the third embodiment.

[0090] Figure 5 The lighting device 20 includes a power supply device 21 , a DC-DC converter 5 , and a lighting load 6 .

[0091] The power supply device 21 includes a rectifier 7 , a normally-on transistor 8 , a smoothing capacitor 13 , and an overvoltage protection element 22 .

[0092] The drain of the normally-on transistor 8 is connected to the high-potential output terminal 23 of the rectifier 7 , and the source of the normally-on transistor 8 is connected to one end of the smoothing capacitor 13 . The other end of the smoothing capacitor 13 is connected to the low potential output terminal 24 of the rectifier 7 . The gate of the normally-on transistor 8 is connected to the source of the normally-on transistor 8 . The overvoltage protection element 22 is connected between the drain a...

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PUM

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Abstract

According to one embodiment, a power supply device includes a rectifier circuit, a smoothing capacitor, and a normally on type transistor. The rectifier circuit is configured to rectify an alternating current supplied from a voltage source. The smoothing capacitor is charged by an output current output from the rectifier circuit. The normally on type transistor is connected between the rectifier circuit and the smoothing capacitor in series and is configured to limit an output current value of the rectifier circuit during a voltage input from the voltage source to an output current value higher than an output current value of the rectifier circuit during a steady operation.

Description

technical field [0001] Embodiments of the present invention relate to a power supply device and a lighting device. Background technique [0002] A power supply device for lighting a light source such as a light emitting diode (LED) as a lighting device includes a rectifier circuit, a smoothing circuit, a direct current-direct current (DC-DC) converter, and the like. The rectification circuit and smoothing circuit convert commercial AC power to DC. The DC-DC converter converts the DC to the required voltage and supplies it to the LED. Typically, diode bridge rectifiers are used for rectification and capacitors are used for smoothing. [0003] When the commercial AC power supply is turned on to the power supply unit, the smoothing capacitor is charged through the power switch and the rectifier. At this time, there are only low-impedance elements on the path through which the charging current flows, so an excessive charging current, that is, an inrush current, flows. This c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/375H05B45/3725H05B45/38H05B47/10H02M7/06
Inventor 大武宽和北村纪之高桥雄治石川真人三浦洋平
Owner TOSHIBA LIGHTING & TECH CORP
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