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Electronic ballast and method for operating at least one discharge lamp

A technology for electronic ballasts and discharge lamps, applied in the field of negative threshold value, can solve problems such as large loss of inverters

Inactive Publication Date: 2014-12-10
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this measure leads to increased reactive currents in the inverter and thus to undesirably large losses in the inverter

Method used

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  • Electronic ballast and method for operating at least one discharge lamp
  • Electronic ballast and method for operating at least one discharge lamp
  • Electronic ballast and method for operating at least one discharge lamp

Examples

Experimental program
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Embodiment Construction

[0023] figure 1 A schematic diagram of an embodiment of an electronic ballast according to the invention is shown. Although the present invention is described below using an inverter with a half-bridge circuit as an example, it is obvious to those skilled in the art that the principle according to the present invention can also be used in an inverter with a full-bridge circuit.

[0024] exist figure 1 The electronic ballast shown in has an input with a first input connection E1 and a second input connection E2 for coupling to a DC power supply. current, which is the so-called intermediate circuit voltage U Zw , which is usually obtained from the grid AC voltage. The intermediate circuit voltage U Zw is applied to an inverter 10 comprising a first electronic switch S1 and a second electronic switch S2 in a half-bridge arrangement. A control device 12 is provided for actuating the switches S1 , S2 . In particular, the control device 12 controls the switches S1 , S2 such th...

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PUM

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Abstract

In various embodiments, ballast for a discharge lamp includes input and output connections; inverter with bridge circuit with electronic switches and control device for controlling electronic switches, wherein switches are connected in series between input connections, wherein one electronic switch is coupled to first input connection and second electronic switch to second input connection, wherein a bridge midpoint is between electronic switches; including a current measuring device for measuring second electronic switch current; lamp choke series-connected between bridge midpoint and first output connection; capacitor parallel-connected with one of electronic switches; and coupling capacitor; wherein control device is coupled to current measuring device and renders an electronic switch conducting, if negative threshold value is exceeded when electronic switch is rendered nonconducting; or if negative threshold value of current through electronic switch is not exceeded after another electronic switch is rendered nonconducting, wherein control device increases first frequency in second case.

Description

technical field [0001] The invention relates to an electronic ballast for operating at least one discharge lamp, which has an input with a first and a second input connection for coupling to a DC supply voltage; an output, the said output has a first and a second output connection for coupling with at least one of said discharge lamps; an inverter having a bridge circuit with at least one first and a second electronic switch and control means for operating at least first and second electronic switches such that the first and second electronic switches are alternately turned on at a first frequency, wherein the first and second switches are coupled in series between the first and second electronic switches Between the second input interface, wherein the first electronic switch is coupled to the first input interface and the second electronic switch is coupled to the second input interface, wherein a first bridge midpoint is formed between the first and second electronic switch;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/282
CPCH05B41/2828
Inventor 阿尔韦德·斯托姆
Owner OSRAM GMBH