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Broadband, high-linearity LED amplifier having high output capacity in a compact design

An amplifier circuit, input stage technology, applied in lighting devices, light sources, electrical components, etc., can solve problems such as large structure size, low output impedance of operational amplifiers, and expensive impedance converters

Inactive Publication Date: 2012-09-12
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such impedance converters in the form of transformers are expensive, narrow-band and have a large construction size
Op amps available specifically for the double-digit MHz range have a relatively low output impedance of about 5 ohms, for which the frequency range and linearity are not large enough

Method used

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  • Broadband, high-linearity LED amplifier having high output capacity in a compact design
  • Broadband, high-linearity LED amplifier having high output capacity in a compact design

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Embodiment Construction

[0029] figure 1 An embodiment of the amplifier circuit of the present invention is shown. The nature of the task according to the invention can be achieved as follows. The input stage is an amplifier 1 with a high ohmic input, which amplifies the voltage of the input signal. Amplifier 1 is able to drive a subsequent driver circuit 2 . The drive circuit 2 is between the input stage and the LEDs with DC power supply. The driver circuit 2 has a relatively large input resistance, so that the integrated amplifier 1 can likewise be used as an input stage, which necessarily has a slightly greater bandwidth than the driver circuit 2 . The driver circuit 2 consists of two complementary transistors 3, two current sources 4 and a voltage regulation circuit 5 which regulates the voltage between the two base terminals of the transistor 3 according to the transistor temperature. The DC power supply 6 of the LED is composed of a coupling capacitor Cds and a coil Ls. The light-emitting d...

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Abstract

The invention relates to an amplifier circuit for actuating a light diode. The amplifier circuit according to the invention has a small output impedance of approximately 3 Ohms, a large bandwidth having a lower threshold frequency of 200 kHz and an upper threshold frequency of 5 MHz, for example, and an amplitude of the output current of several 100 mA, for example. The amplifier circuit is characterized in that said circuit has an entry stage for actuating a driver circuit (2) which actuates the light diode by means of a direct current supply (6).

Description

technical field [0001] The invention relates to an amplifier circuit for driving light-emitting diodes. Background technique [0002] Space lighting should be used to transmit high data rates by modulation. In laboratory tests, high-efficiency light-emitting diode (LED) lighting systems such as the LED module - OSRAM's OSTAR E3B have proven suitable. [0003] For the LED module OSTAR E3B an efficient amplifier had to be developed which, despite the low input impedance of the LED module, still meets the extremely high demands on output power, bandwidth and linearity. Furthermore, a compact design also plays an important role in order to be able to integrate the LED module including the amplifier into the room lighting. [0004] The impedance of light-emitting diodes is very small over the entire frequency range from a few 100 KHz to several 10 MHz. If a conventional high-frequency amplifier with an output impedance of 50 ohms is used for driving the LED, its output impedan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/39H05B45/3725H05B45/37
Inventor R.鲍姆加特纳A.科恩比希勒J.瓦莱夫斯基
Owner SIEMENS AG