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Overload protection unit for readjusting switching elements

A technology of circuit devices and adjusting components, which is applied in the direction of electrical components, output power conversion devices, and adjusting electric variables, etc., can solve the problem that the trimmer cannot overcome the short-circuit point, and achieve the effect of small cost

Inactive Publication Date: 2004-10-13
NOKIA SIEMENS NETWORKS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result the electrical appliance reaches the short-circuit area and the trimmer cannot overcome the short-circuit point

Method used

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  • Overload protection unit for readjusting switching elements
  • Overload protection unit for readjusting switching elements
  • Overload protection unit for readjusting switching elements

Examples

Experimental program
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Embodiment Construction

[0031] According to the circuit principle of the present invention, for trimmer LR input voltage UA X Not fixed but changeable. A third regulating circuit (see Figure 2) intervenes in the regulation of the directly regulated output voltage, by means of which it is possible, if necessary, to limit the voltage across the series regulator transistor of the trimmer LR, especially a linear regulator at a predetermined value U DIF、MAX superior. This principle is illustrated in FIG. 2 .

[0032] Additional regulation circuits can be adjusted by a signal S 2 to accept control through the converter U. In normal operation, U DIF Than U DIF、MAX small. An indispensable positive regulation error D leads to regulation signal S 2 above the regulation voltage and therefore cannot interfere with the regulation of the directly regulated circuit. In this case, directly from the first output voltage UA 1 The derived conditioning signal S 1 Control converter U.

[0033] If the voltage ...

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PUM

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Abstract

Method for regulating a plurality of output voltages of a converter, of which a first output voltage controls the converter and further output voltages are kept constant by readjusting elements, it being the case that when a prescribed voltage difference across the readjusting element is exceeded, the converter is controlled by a control loop, proceeding from the respective readjusting element.

Description

technical field [0001] The present invention relates to overload protection of trimming circuit components, in particular to a method for regulating several output voltages of a converter and a circuit arrangement using the method. Background technique [0002] The part of the circuit network with several output voltages is often realized by means of a transformer comprising several output windings. Since in this principle only one output voltage can be regulated directly by the converter, the other outputs must be regulated indirectly. For this purpose, a linear trimmer is used which regulates the unregulated voltage UAx of an output winding to a desired value UAx. exist figure 1 explain this principle. [0003] The trimming circuit generally includes a current limiter, which automatically protects the connected consumer and the trimmer in the event of an error, for example in the event of a short circuit. In most applications, a near-vertical current-limit characterist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/575H02M1/00H02M1/32H02M3/335
CPCG05F1/575H02M3/33561H02M1/32
Inventor B·比藤克
Owner NOKIA SIEMENS NETWORKS GMBH & CO KG