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Circuit arrangement for operating n parallel branches with at least one semiconductor light source

A circuit device and semiconductor technology, which is applied in the field of circuit devices, can solve problems such as brightness fluctuations and unpopular projected images, and achieve cost-saving effects

Active Publication Date: 2018-05-18
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, DLP projection systems equipped with such circuit arrangements exhibit undesired, visible brightness fluctuations of the projected image

Method used

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  • Circuit arrangement for operating n parallel branches with at least one semiconductor light source
  • Circuit arrangement for operating n parallel branches with at least one semiconductor light source
  • Circuit arrangement for operating n parallel branches with at least one semiconductor light source

Examples

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Embodiment Construction

[0022] In the following embodiments, for the sake of simplicity, the present invention is described by taking a circuit device having only two semiconductor light source units as an example. As is obvious to a person skilled in the art, this can be extended to any desired number of semiconductor light source units, in particular to n equal to 3, 4, 5, 6, etc.

[0023] figure 1 The time course of such different measurements from a circuit arrangement known from the prior art is shown in a schematic diagram. The currents supplied by the respective driver arrangement to the respective branches with at least one semiconductor light source are referred to as I1 and I2. u D1 and U D2 Indicates the voltage at the working electrode of the respective converter switch of the respective semiconductor light source unit relative to the reference potential and thus reflects the temporal profile of the respective switching frequency. As clearly recognized, these switching frequencies are...

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PUM

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Abstract

The invention relates to a circuit arrangement for operating n (n greater than or equal to 2) branches connected in parallel with at least one semiconductor light source, comprising an input terminal for connection to a DC voltage source; At least one n semiconductor light source unit with a branch-connected output of at least one semiconductor light source. n semiconductor light source units are connected in parallel with the input end. Each driver arrangement includes a converter having converter switches and a PWM controller controlling the converter switches. The output terminals of the corresponding converters are connected with the output terminals of the corresponding semiconductor light source units. The circuit arrangement also comprises a control device with n control outputs, wherein each PWM controller has a clock pulse input, wherein one control input is connected to each clock pulse input of the n PWM controllers, wherein the control device It is designed to provide n clock pulse signals whose phases are shifted by 360° / n from each other at its n control output terminals.

Description

technical field [0001] The invention relates to a circuit arrangement for operating n (n greater than or equal to 2) parallel branches with at least one semiconductor light source, comprising: an input connected to a DC voltage source and having a first and a second input connection ; Respectively comprising a driver device and n semiconductor light source units for output ends connected to at least one branch circuit with at least one semiconductor light source, wherein the n semiconductor light source units are connected in parallel between the first and second input port interfaces Among them, each driver device includes a PWM (Pulsweitenmodulation (pulse width modulation)) controller with a control output terminal and a converter, wherein each converter includes at least one converter inductance coil, a converter diode and a converter switch, so The converter switch has a control electrode, a working electrode and a reference electrode, wherein the control output terminal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B45/20H05B45/46H05B45/37H05B45/325
Inventor 约瑟夫·奥斯特赖德
Owner OSRAM GMBH
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