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Circuit arrangement for driving a light source

A technology of circuit devices and light sources, which is applied in the field of circuit devices and can solve problems such as low efficiency and high loss of circuit devices

Inactive Publication Date: 2018-02-02
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] With unidirectional rectification, diode D3 conducts however only in the polarity of the resonant circuit formed by L1 and C2, so a high reactive current is necessary relative to the LED current, which leads to high losses and only 80% to 85% low efficiency of circuit devices

Method used

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  • Circuit arrangement for driving a light source
  • Circuit arrangement for driving a light source
  • Circuit arrangement for driving a light source

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no. 2 approach

[0034] According to a second embodiment, instead of the asymmetrical coupling capacitor C1 , the circuit arrangement has its two symmetrically connected coupling capacitors C1 , C8 . The coupling capacitor is separated here from the existing position between the inductor L1 and the second bridge rectifier D2 . The second connection of the inductor L1 is directly connected to the first input of the bridge rectifier D2. A second input of the bridge rectifier D2 is coupled to the first coupling capacitor C1 and to the second coupling capacitor C8. A further connection of the first coupling capacitor C1 is coupled to the reference potential of the half-bridge arrangement 2 . The other connection of the second coupling capacitor C8 is coupled to the supply potential of the half-bridge arrangement 2 . A filter capacitor C6 is connected to the output of the coil of the current-compensated inductor L3 and its input is coupled to the negative output of the second bridge rectifier. S...

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PUM

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Abstract

The invention relates to a circuit arrangement for driving a light source, the circuit arrangement having: an input connection for inputting a supply voltage; a first rectifier circuit; a boost converter with an output connection; A half-bridge device composed of switches connected to the output terminals; an inductor, the first terminal of which is coupled to the center point of the half-bridge; a second rectifier circuit, the first input terminal of which is coupled to the second terminal of the inductor and the second input terminal of the second rectification circuit is coupled to at least one of the output terminals of the boost converter; wherein the output terminal of the second rectification circuit is coupled to the input terminal of the current-compensated choke coil, In this case, at least one light source is connected to the output terminal of the current-compensated choke, and the output terminal of the current-compensated choke is coupled via a smoothing capacitor to the output terminal of the step-up converter.

Description

technical field [0001] The invention originates from a circuit arrangement for driving a light source, which has: an input terminal for inputting a supply voltage; a first rectifier circuit; a step-up converter with an output terminal; consisting of two switches connected to the output terminal The half-bridge device; the inductor, the first terminal of the inductor is coupled to the center point of the half-bridge device; the second rectifier circuit, the first input terminal of the second rectifier circuit is coupled to the second terminal of the inductor, and the second A second input of the rectifier circuit is coupled to at least one of the output connections. Background technique [0002] The invention originates from a circuit arrangement for operating a light source. [0003] figure 1 A known circuit arrangement with a resonant output characteristic is shown. The choke coil L is regulated from the pulse source U e current. The alternating current limited by the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/46Y02B20/30H05B45/38H05B45/36H05B45/355H05B45/39H02M1/42H02M3/33546
Inventor 马库斯·黑克曼约阿希姆·穆尔施勒格尔托马斯·波利施安斯基哈拉尔德·施米特
Owner OSRAM GMBH