LED lighting on device

A technology of lighting device and rectifying voltage, which is applied in lighting device, lamp circuit layout, light source and other directions to reduce the impact current and prevent flicker

Inactive Publication Date: 2014-02-12
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the device described in Patent Document 1, it is necessary to newly add a damping resistor, a switching element for controlling whether to connect the damping resistor to the noise prevention circuit, and a control circuit for controlling the switching element. Considering the problem of increasing the size of the device

Method used

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Embodiment Construction

[0058] Embodiments of the present invention will be described below using the drawings.

[0059] figure 1 It is a basic configuration diagram of the LED lighting device 1 in the first embodiment of the present invention. exist figure 1 In , the AC power supply 100 , the dimmer 101 and the LED load 106 are not included in the LED lighting device 1 . The LED lighting device 1 is composed of a rectifier circuit 102 , a diode 103 , a capacitor 104 , a DC-DC conversion circuit 105 , a shunt circuit 107 , a switching circuit 108 , and a current setting circuit 109 .

[0060]One end of the AC power supply 100 is connected to one end of the dimmer 101 , and the other end of the dimmer 101 is connected to the rectifier circuit 102 in the LED lighting device 1 . The other end of the AC power supply 100 is connected to a rectification circuit 102 . The AC power supply 100 generates an AC power supply voltage (hereinafter referred to as Vac). The rectification circuit 102 rectifies t...

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Abstract

The present invention provides an LED lighting on device, which is small-sized and high-efficient and is capable of preventing flicker and reducing an impact current in the case of being connected to a light modulator. The LED lighting on device has: a rectifying circuit for changing an AC voltage into a rectified voltage; a first capacitor for changing the rectified voltage into a DC link voltage; a DC-DC conversion circuit for converting the DC link voltage to supply power to an LED load; a current setting circuit for outputting a current set value of the DC-DC conversion circuit based on the rectified voltage; a shunt circuit connected between DC output terminals of the rectifying circuit and having at least one series body if a resistor and a switching element; and a switching circuit for controlling the switching element in the series body, wherein, the switching circuit connects the switching element in the at least one series body in the series bodies during the period of the rectified voltage lower than a desired reference voltage and during the period from the moment when the rectified voltage is higher than the desired reference voltage to the moment when desired time has passed.

Description

technical field [0001] The present invention relates to a lighting device of a light emitting diode (hereinafter referred to as LED: Light Emitting Diode). Background technique [0002] LEDs are attracting attention as light sources with excellent environmental properties, and LED lighting is used as lighting for houses and offices. Among the LED lighting, there is a lamp-shaped LED lighting that is provided with a base similar to that of an incandescent lamp, and is mounted on a device for the incandescent lamp to be used. Among them, there are also products corresponding to phase control dimmers (hereinafter simply referred to as dimmers) used as dimming means for incandescent lamps. Most dimmers conduct on / off between the AC power source and the load by turning on / off the semiconductor element. As the semiconductor element of the dimmer, a triac (TRIAC: Triode Alternating Current Switch, 3-terminal bidirectional thyristor) or the like is used. Hereinafter, the semicond...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H05B37/02
Inventor门田充弘庄司浩幸畠山笃史
OwnerHITACHI LTD