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Circuit for a power supply unit for generating a DC voltage

A power supply unit, DC voltage technology, applied in electrical components, DC power input into DC power output, AC power input into DC power output and other directions

Inactive Publication Date: 2014-01-08
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This recharging process can be synchronized with the frequency of the primary current and lead to saturation of the current transformer

Method used

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  • Circuit for a power supply unit for generating a DC voltage
  • Circuit for a power supply unit for generating a DC voltage

Examples

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Embodiment Construction

[0009] figure 1 A circuit according to the invention for a power supply unit for generating a DC voltage, for example for operating an electronic system, is shown. The power supply unit has a current transformer 1 , which conducts alternating current on the primary side. The primary current in the current transformer 1 is converted into a secondary current and supplied to a rectifier 2 in which the rectification of the secondary current takes place in a known manner. Arranged in series with the rectifier 2 are: on the one hand, a first blocking diode 3 and a charging capacitor 4 , which is charged by the rectified current; and, on the other hand, a grounded load 7 . Charging can be interrupted by means of an electronic switch 5 which is connected in parallel to the current transformer 1 and short-circuits it when switched on. The comparator 6 is used to control the electronic switch 5 . Furthermore, a circuit 9 for monitoring the voltage across the charging capacitor 4 is p...

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PUM

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Abstract

A circuit is disclosed for a power supply unit for generating a DC voltage, the power supply unit having a current transformer, a rectifier, a series circuit including a first blocking diode and a charging capacitor, an electronic switch which is in parallel with the current transformer, a comparator, a voltage reference circuit for the comparator. In at least one embodiment, the circuit includes a circuit for monitoring the voltage across the charging capacitor. The comparator is used to control the electronic switch on the basis of the voltage across the charging capacitor in relation to the voltage which is generated by the voltage reference circuit and is applied to the comparator. In at least one embodiment, provision is made of a tap which is located between the rectifier and the first blocking diode and at which the circuit for monitoring the voltage across the charging capacitor is located. The circuit is in the form of an RC combination having a second blocking diode connected in series.

Description

technical field [0001] The invention relates to a circuit for a power supply unit for generating a direct current voltage, comprising: a current transformer; a rectifier; a series circuit composed of a first blocking diode and a charging capacitor; an electronic switch connected in parallel with the current transformer; a comparator; a reference voltage circuit for a comparator; and a circuit for monitoring a voltage across a charging capacitor, wherein the comparator is adapted to: be controlled depending on the voltage across the charging capacitor referenced by the voltage generated by the reference voltage circuit and applied to the comparator electronic switch. Background technique [0002] Such circuits for supply units belong to the prior art and are used, for example, in switching devices for supplying electronic overcurrent releases. The current transformer used here can be considered as a non-ideal power source. This means that a secondary current proportional to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/08H02M3/156H02M1/36
CPCH02M3/1563H02M7/2176H02M2001/0087H02M1/0087
Inventor 安德烈亚斯·费舍尔
Owner SIEMENS AG
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