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Circuit arrangement for operating at least one LED

A circuit device and voltage technology, applied in the direction of circuit devices, battery circuit devices, output power conversion devices, etc., can solve the problems of ineffective use and achieve the effect of economical design and constant output current

Active Publication Date: 2012-08-22
OPTOTRONIC GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in a gap in the current switching the inductor coil and thus inefficient use of the device

Method used

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  • Circuit arrangement for operating at least one LED
  • Circuit arrangement for operating at least one LED
  • Circuit arrangement for operating at least one LED

Examples

Experimental program
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Embodiment Construction

[0030] figure 1 A schematic diagram of a first exemplary embodiment of a circuit arrangement according to the invention is shown. Reference numerals introduced with reference to this embodiment apply correspondingly in Figure 4 The embodiments shown in , as far as the same or similar devices are concerned. In this regard, combined with Figure 4 only for figure 1 The differences of the illustrated embodiments are discussed in depth.

[0031] figure 1 The circuit arrangement shown in includes an input stage 10, at whose input the mains voltage U can be connected N and provides the rectified grid voltage U at its output Gl . The input stage comprises a fuse SI1 arranged in series with the input and a varistor VAR coupled in parallel between the two input terminals. followed by the grid voltage U N Rectifier BR1 for rectification and two smoothing capacitors C1, C8. The rectified grid voltage U Gl Provided to the step-down converter 12, the step-down converter include...

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PUM

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Abstract

The invention relates to a circuit arrangement for operating at least one LED, comprising a free-running voltage converter (12) that has a converter throttle (L1A; L1), a converter diode (D5), and a converter switch (V5), the circuit arrangement further comprising a control device for the converter switch (V5). According to the invention, a circuit arrangement preferably composed of discrete components is used to control the switching transistor. In said circuit arrangement, the current flowing through the converter switch is measured while the throttle is magnetized so as to allow the transistor to be switched off when a predefined maximum value has been reached for said current, and the demagnetization of the throttle is detected by the circuit logic in order to be able to immediately switch the transistor back on.

Description

technical field [0001] The invention relates to a circuit arrangement for operating at least one LED, which has: an input with a first and a second input connection for coupling to a DC power supply; an output with a first and a second output connection, For coupling with at least one LED; a transformer with a switching inductance coil, a switching diode and a switching switch, wherein the input of the transformer is coupled to the input of the circuit arrangement and the output of the transformer is coupled to the output of the circuit arrangement; and for switching Switch control device. Background technique [0002] The invention relates in particular to a driver circuit which generates a power supply for at least one LED from a common mains voltage, for example 100V or 230V. From the prior art it is known to use a circuit topology known as a buck converter for the drive circuit. This buck converter operates in so-called discontinuous mode, i.e. there is a gap in the in...

Claims

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Application Information

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IPC IPC(8): H02M3/338H05B33/08H05B44/00
CPCH02J7/34H02J15/00H03K5/2418H05B45/38H05B45/3725
Inventor 克劳斯·菲舍尔
Owner OPTOTRONIC GMBH