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Light modulator

A dimmer, solid-state light-emitting technology, applied in the field of dimmers, can solve the problem of light source flickering, triac not switching to non-conducting state, no triac switching on or off dimming, etc. problem, to achieve the effect of preventing flicker

Active Publication Date: 2015-08-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, there may be a problem that, depending on the output timing of the trigger signal, the triac is not switched to the non-conductive state (off) even when the power supply voltage of the external power source crosses zero, so the triac is in the The supply voltage continues to be on during the subsequent half-cycle
As a result, the triac is not turned on or off properly and may perform undesired dimming, which causes the light source to flicker

Method used

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Embodiment Construction

[0016] Embodiments of the dimmer of the present invention will be described below with reference to the accompanying drawings which form a part hereof. Such as Figure 1A~2 As shown, the dimmer 2 according to the present embodiment changes the conduction angle of the power supply voltage supplied from the commercial power supply (external power supply) AC1 to the lighting apparatus 1 including the light source 10 by phase control.

[0017] Such as figure 2 As shown, the lighting device 1 includes: a light source 10, which has a light-emitting diode 10A connected in series, that is, a solid light-emitting element, and a resistor R1 for limiting the current; and a dimmer switch 11, which is connected in series with the light source 10 and used To turn on or off to supply power to the light source 10 . The lighting apparatus 1 further includes: a rectifier 12 for rectifying the AC voltage supplied from the commercial power supply AC1; a smoothing unit 13 for smoothing the outp...

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Abstract

A dimmer includes: a switching element connected to a lighting apparatus using a light emitting element as a light source and an external power source, in series; a phase detection circuit for outputting a synchronization signal when a power source voltage from the external power source reaches a predetermined voltage; and a control circuit for generating a trigger signal which varies a conduction angle of the power source voltage supplied from the external power source to the lighting apparatus to switch on or off the switching element. The control circuit generates the trigger signal based on rising of the synchronization signal and stops generating the trigger signal when a rising interval of the synchronization signal is out of a reference range.

Description

technical field [0001] The invention relates to a dimmer for dimming and lighting a light source through phase control. Background technique [0002] Conventionally, a technique is known in which an AC power source is electrically connected to a triac, that is, a triac, for on / off control of the AC power source, and through the On / off control of a triac to turn on / off an LED (Light Emitting Diode) lamp (see, for example, Japanese Patent Laid-Open No. 5-66718 (JP5-66718A)). Conventional examples disclosed in JP5-66718A include: a diode bridge circuit for rectifying AC power received from a triac that performs on / off control of AC power to DC power; and an LED lamp, It is lit using DC power output from the diode bridge circuit. [0003] However, when phase-controlling the conduction angle of the power supply voltage supplied from the external power source to the light source based on the on / off control of the triac as described above, it is necessary to provide the triac for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B33/0842Y02B20/346H05B33/0809H05B33/0815Y02B20/30H05B45/31H05B45/3725
Inventor 村上善宣中川原光治
Owner PANASONIC CORP
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