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Current overload and voltage detection in a central point

A mid-point and voltage technology, applied in the field of computer software program products, can solve the problem of additional occupation of integrated circuit pins

Inactive Publication Date: 2009-07-15
TRIDONIKATKO GMBKH & KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this circuit is that in order to monitor the midpoint voltage in the control unit, for example, the control unit that controls the switch at the same time monitors the midpoint voltage, and additional pins of the integrated circuit need to be occupied.

Method used

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  • Current overload and voltage detection in a central point
  • Current overload and voltage detection in a central point
  • Current overload and voltage detection in a central point

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] Figure 1a A first exemplary embodiment of the invention is shown in which a DC mains voltage 3 is transmitted to an inverter 10 with a half bridge circuit 5 . The half-bridge circuit 5 has two power switches 1 and 2 , to which in each case freewheeling diodes 11 and 12 are connected in parallel. These freewheeling diodes 11 and 12 can also be integrated into switches (transistors). By suitable (high-frequency) timing of switches 1 and 2 by means of control unit 6, an (high-frequency) alternating voltage can be generated at midpoint 4 of half-bridge circuit 5, which can be transmitted, for example, to a subsequent load circuit In the choke coil 13, the load circuit usually includes a lamp.

[0026] The role of the monitoring circuit connected to the half-bridge circuit 5 is, on the one hand, to avoid so-called hard switching, that is, non-low potential switching transistors 1 and 2 . Before the switch is turned on, the switch switches at low potential when the freewhe...

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PUM

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Abstract

An inverter arrangement with half-bridge circuit has two series-connected power switches (transistors) (1,2) supplied with DC voltage at their center-point (4) during opposite-phase clocking of the switches (1,2) to provide an AC voltage. A control unit (6) clocks the power-switches (1,2), and a measurement signal tapped off at the center-point (4) is evaluated during different time phases of clocking of the switches (1,2) to detect the current through the half-bridge (5) or the voltage at the center-point (4). Independent claims are included for the following (A) An electronic ballast for gas-discharge lamps (B) A monitoring method for the inverter state (C) A computer software program product.

Description

technical field [0001] The invention relates to an inverter with a half-bridge circuit, an electronic ballast (EVG) for a gas discharge lamp with such an inverter, a method for monitoring the state of an inverter with a half-bridge circuit, and the operation of the inverter with the aid of a computer A computer software program product that supports this method. Background technique [0002] By way of example, the background of the invention is the field of electronic ballast applications. Such electronic ballasts are known from the state of the art and conventionally have a rectifier supplied from the mains voltage with power factor correction (PFC). The DC voltage generated by the device is then transmitted to a high frequency clocked half-bridge to generate a high frequency AC voltage which is then transmitted to at least one connected gas discharge lamp. A half-bridge circuit typically has two switches connected in series, such as power transistors, clocked by a contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/538H05B41/285H05B41/298
CPCH02M7/53803H02M1/38
Inventor 戴尔特·克莱恩
Owner TRIDONIKATKO GMBKH & KO KG