Illuminating system based on light emitting diode and its driving circuit and method

A technology of light-emitting diodes and driving circuits, applied in electroluminescent light sources, light sources, electric light sources, etc., can solve the problem that LED brightness cannot be freely adjusted, and achieve good dimming effect.
CN101155446AInactive Publication Date: 2008-04-02MAISHI ELECTRONICS (SHANGHAI) LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
MAISHI ELECTRONICS (SHANGHAI) LTD
Publication Date
2008-04-02
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

A luminous system based on a luminous diode and a luminous diode driver circuit and method are disclosed in the present invention. The driver circuit comprises a switch, a pulsewidth modulation signal generator and a regulator coupling with the pulsewidth modulation signal generator. To control the conducting time and the closing time of the switch according to the duty-ratio of the pulsewidth modulation signal generated by the pulsewidth modulation signal generator, so as to regulate the current provided to the luminous diode. One input end of the regulator receives the external input signal, and outputs a controlling signal to the pulsewidth modulation signal generator according to the external input signal, regulates the duty-ratio of the pulsewidth modulation signal generated by it, leads the luminous diode current to be able to increase or decrease according to the external input signal, thereby realizes to regulate the brightness of the luminous diode freely.
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Description

technical field

[0001] The invention relates to a lighting system, a driving circuit and a driving method, in particular to a lighting system based on a light emitting diode, a driving circuit and a driving method of the light emitting diode. Background technique

[0002] Due to many advantages such as low power consumption, long life, and compact structure, light-emitting diodes (LEDs) are widely used in liquid crystal displays (LCDs) of personal digital assistants (PDAs), mobile phones (Mobile Phones) and other devices as background light sources. . The LED is driven by a DC / DC converter, which converts the input voltage provided by the power supply into the output voltage required by the LED by controlling the on and off of the switch. Usually, pulse width modulation (PWM) technology is used to adjust the current of the LED to control the change of the LED current. The current of the LED is modulated by a PWM control signal in the feedback loop.

[0003] US Patent Publ...

Claims

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