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Dimming circuit, isolated voltage generator and dimming method for light emitting diode (LED)

A technology of voltage generator and light emitting diode, which is applied in the direction of electric lamp circuit arrangement, light source, electric light source, etc., can solve the problem of dimming the brightness of the light emitting diode, and achieve the effect of increasing the range of dimming

Inactive Publication Date: 2011-03-30
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the chip LM3445 will control the transistor 130 to reduce the current of the load current ILED, and the brightness of the light-emitting diode will become darker as the current of the load current ILED decreases.

Method used

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  • Dimming circuit, isolated voltage generator and dimming method for light emitting diode (LED)
  • Dimming circuit, isolated voltage generator and dimming method for light emitting diode (LED)
  • Dimming circuit, isolated voltage generator and dimming method for light emitting diode (LED)

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Embodiment Construction

[0050] Figure 2A It is a system diagram of a dimming circuit according to an embodiment of the present invention. Please refer to Figure 2A , the dimming circuit 200 includes a phase dimmer 210 , an isolated voltage generator 220 and a current controller 230 , wherein the dimming circuit 200 is assumed to be used to drive a light emitting diode and perform dimming. The phase dimmer 210 receives the AC voltage VAC and modulates the AC voltage VAC according to its set dimming phase angle, thereby adjusting the pulse width of the modulated AC voltage VAC according to the dimming phase angle. The following modulated AC voltage VAC is referred to as the modulated signal Vac, wherein the AC voltage VAC may be a commercial AC voltage.

[0051] The isolated voltage generator 220 is coupled to the phase dimmer 210 to generate the driving signal Vo according to the modulation signal Vac to drive the LED string 50. The LED string 50 shown is a schematic diagram, but the actual LED st...

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PUM

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Abstract

The invention discloses a dimming circuit, an isolated voltage generator and a dimming method for a light emitting diode (LED), namely a dimming circuit and a dimming method for an isolated configuration LED applied to a traditional phase dimmer. When the dimming phase angle of the phase dimmer is regulated, the secondary side of an isolated configuration transformer generates a pulse width corresponding to a modulated alternating voltage so as to correspondingly regulate the pulse width of a drive signal output by the secondary side of the transformer; and in addition, the pulse width corresponding to the modulated alternating voltage can change current flowing through the LED by means of the dimming circuit, thus the isolated LED dimming device can regulate the pulse width and size of the current flowing through the LED according to the dimming phase angle of the phase dimmer, thereby increasing the dimming range of the LED.

Description

technical field [0001] The invention relates to a dimming circuit, in particular to a dimming circuit of a light emitting diode, an isolated voltage generator and a dimming method thereof. Background technique [0002] Light Emitting Diodes (hereinafter referred to as LEDs) are small in size, power-saving and durable, and as the manufacturing process matures, the price drops. Recently, products using light emitting diodes as light sources are becoming more and more popular. In addition, light-emitting diodes have low operating voltage (only 1.5-3V), can actively emit light and have a certain brightness, and the brightness can be adjusted by voltage or current. At the same time, they have the characteristics of impact resistance, vibration resistance, and long life (100,000 hours). Light-emitting diodes are widely used in various terminal equipment, from automobile headlights, traffic lights, text displays, billboards and large-screen video displays, to general-level architec...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 洪哲民尹又本许岚婷谢致远
Owner NOVATEK MICROELECTRONICS CORP
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