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High stability dimming device

A technology for dimming devices and measuring values, which is applied to lighting devices, light sources, electric light sources, etc., can solve the problems of high cost, achieve the effects of preventing malfunction, suppressing costs, and easy signal processing

Inactive Publication Date: 2014-10-15
ELM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this device, it is necessary to process a large number of sampled data of AC voltage signals when performing high-speed Fourier transform, so a high-performance computing device is required, and there is a problem of high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] (1) Configuration of the dimming device 1 of the present embodiment

[0046] The dimming device 1 of this embodiment is figure 1 Used in the lighting circuit shown, it is connected in series with the AC power supply 2 together with the lighting load 3 such as LED. The dimming device is composed of a switch circuit 4 and a time division control circuit 5 .

[0047] The switch circuit 4 is generally configured by providing a switch element 6 in a rectifier circuit using a diode bridge composed of four diodes ( figure 2 a). A field effect transistor (FET) can be used for the switching element 6 . Additionally, if figure 2 As shown in (b), a switch circuit 4A having two switch elements (FETs) and two diodes can also be used. There are two diodes through which a current flows in the switch circuit 4 , whereas there is one diode through which a current flows in the switch circuit 4A. Therefore, the power loss of the switch circuit 4A can be suppressed. It is also poss...

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PUM

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Abstract

An object of the present invention is to provide a dimming device capable of preventing malfunctions caused by noise or waveform distortion in AC power supply voltage. The dimming device of the present invention is provided with a time-division control circuit, which controls the effective voltage supplied to the lighting load by adjusting the period during which the switching element is turned on, and includes: a zero-cross detection unit (11), which detects a zero-cross point, And generate the zero-crossing signal that the value changes at this zero-crossing point; Oscillator (13), it generates the oscillating signal with the frequency identical or integral multiple of AC power; When the zero-cross signal is generated, the phase difference between the zero-cross signal and the oscillation signal is measured, and based on the data of the measured value, a reference point for determining the timing of turning on or off the switching element (6) is determined; and time-division control a signal generation unit (on / off timing calculation unit (15), time division control signal generation unit (17)) that turns on The / OFF signal is sent to the switching element (6).

Description

technical field [0001] The present invention relates to a dimming device that adjusts the intensity of light emitted by a light source such as a light emitting diode (Light Emitting Diode: LED). Background technique [0002] Conventionally, as means for dimming a light source using an AC power supply, a phase control method using a semiconductor switching element is often used. In the phase control method, generally, a switching element is connected in series between an AC power source and a light source (lighting load), and the conduction angle (conduction angle) in one cycle (cycle) of the AC voltage that turns on the switching element is controlled. , to change the effective voltage supplied from the AC power supply to the lighting load, thereby performing dimming. [0003] In a conventional dimming device employing such a phase control method, a zero-cross point (the timing at which the AC voltage becomes zero) is used as a reference point for controlling the conduction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B41/392H05B44/00
CPCH05B33/0845H05B39/048H05B33/0806H03L7/00Y02B20/346H05B33/0815H05B37/02H05B45/10Y02B20/00Y02B20/30H05B47/10H05B45/3725H05B45/30
Inventor 宫原隆和桐原弘桥口满洋
Owner ELM CO LTD