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Light Emitting Diode Circuit and Its Error Amplifier

An error amplifier and light-emitting diode technology, applied in the field of amplifiers, can solve the problems of unable to provide normal voltage stabilization effect, damage, and easy damage

Inactive Publication Date: 2011-12-07
HIMAX ANALOGIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surge current generated by the light-emitting diode circuit with fast response time can easily make the above-mentioned inductance unbearable and cause damage
Therefore, if the LED circuit does not have a flexible adjustment mechanism for the response time, the inductor will continue to be impacted by the surge current in the working mode, and it will be easily damaged, and it will not be able to provide a normal voltage stabilization effect.

Method used

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  • Light Emitting Diode Circuit and Its Error Amplifier
  • Light Emitting Diode Circuit and Its Error Amplifier
  • Light Emitting Diode Circuit and Its Error Amplifier

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Experimental program
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Embodiment Construction

[0033] Please refer to figure 1 . figure 1 It is a schematic diagram of the LED circuit 1 in an embodiment of the present invention. The light emitting diode circuit 1 includes: an inductor 10 , a light emitting diode group 12 , a power metal oxide semiconductor transistor 14 , an error amplifier 16 and a pulse width modulator 18 .

[0034] The inductor 10 is used for connecting the supply voltage Vp and the first terminal 11, and provides a voltage stabilizing mechanism. The LED group 12 is connected between the first terminal 11 and the ground potential. In this embodiment, the load 120 is actually connected between the LED group 12 and the ground potential. The power metal oxide semiconductor transistor 14 is connected between the first terminal 11 and the ground potential.

[0035] The error amplifier 16 is used for receiving the reference voltage Vref and the feedback voltage Vf. In this embodiment, the feedback voltage Vf is as figure 1 Shown is the output from the...

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Abstract

A light emitting diode circuit and its error amplifier. The light emitting diode circuit includes: an inductor, a group of light emitting diodes, a power metal oxide semiconductor transistor connected to the inductor, an error amplifier, and a pulse width modulator controlling the gate of the power metal oxide semiconductor transistor according to the output terminal of the error amplifier. The error amplifier includes a differential input stage, an output stage having N-type and P-type metal-oxide-semiconductor transistors, and a regulated current source connected to the gate of the P-type metal-oxide-semiconductor transistor. In the first operation mode, the control voltage turns on the adjustment current source. In the second mode of operation, the control voltage turns off the regulation current source.

Description

technical field [0001] The disclosure relates to an amplifier, in particular to an error amplifier and a light emitting diode circuit including the error amplifier. Background technique [0002] Light emitting diodes (LEDs) are estimated to be approximately four times more efficient than conventional light bulbs for lighting tools. Moreover, LEDs do not contain toxic mercury as traditional light bulbs, and have a longer service life than light bulbs. Due to various factors, light-emitting diodes have become the latest mainstream technology in modern lighting technology. [0003] In order to stabilize the voltage of the light-emitting diode circuit, the purpose is often achieved by setting the inductor. When the LED circuit starts to operate, a fast response time is required to quickly enter the working mode, and the fast response time will enable the LED circuit to generate a considerable current in a short time. However, the surge current generated by the LED circuit wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H05B37/02
Inventor 尹明德李秋平
Owner HIMAX ANALOGIC INC