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Overload protecting circuit of transformer

An overload protection and transformer technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as difficulty in suppressing transformer overload, difficulty in comprehensively monitoring transformer voltage, and inability to monitor transformer terminals to generate signals, etc. The effect of improving reliability, accurate monitoring and prevention, and securing stable voltage supply

Inactive Publication Date: 2005-12-28
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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AI Technical Summary

Problems solved by technology

[0017] The existing transformer overload protection circuit uses the feedback of the voltage on the secondary side of the transformer to prevent the occurrence of overload, but it cannot monitor the signals generated by all terminals on the secondary side of the transformer.
That's because if figure 1 As shown, among the many voltages generated on the secondary side of the transformer, the equipment only feeds back the standard voltage for control, so it is difficult to fully monitor all the voltages generated on the secondary side of the transformer
Due to the above problems, it is difficult for the existing transformer overload protection circuit to suppress the transformer overload phenomenon generated in audio equipment and other instruments.

Method used

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Embodiment Construction

[0034] The implementation of the transformer overload protection circuit of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] figure 2 It is a component diagram of the transformer overload protection circuit of the present invention.

[0036] The transformer overload protection circuit of the present invention is a voltage generating device capable of generating various DC voltages required by products by using the input of AC power.

[0037] As shown in the figure, in the transformer overload protection circuit of the present invention, the primary side end of the transformer T100 is connected with a switching power supply 101 (that is, for figure 2 The SMPS switching part 101) in the above is to alternately output the AC power supply to the above-mentioned voltage generating device through the pulse width modulation switch, that is, the power supply of the primary side coil T101 of the transformer T100 is carried...

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Abstract

The invention consists of: switching power outputting the AC power to voltage generating device through width pulse modulation; feedback control unit outputting feedback signal to switching power; voltage detecting unit selecting standard input voltage from voltage outputted from voltage generating device and controlling feedback control unit according to control signal outputted from standard voltage; abnormal voltage detecting unit connecting to all outputs of voltage generating device in order to monitor abnormal voltage generated from each output contact, when abnormal voltage occurs, cut off control signal to feedback control unit outputted from voltage detecting unit.

Description

(1) Technical field [0001] The present invention relates to a transformer overload protection circuit; in particular, it refers to a transformer overload protection circuit for protecting the transformer by monitoring the short circuit phenomenon of multiple terminals on the secondary side of the transformer to prevent the occurrence of overload. (2) Background technology [0002] A power supply device similar to a switching power supply SMPS (Switch Mode PowerSupple) is used in all electronic and communication equipment. This power supply unit generates direct current (DC) power of various sizes required inside the product. Therefore, the power supply device needs the input of an external AC power supply, and uses transformers and other equipment to provide the required DC power supply of various sizes to the product. [0003] The above-mentioned transformer adopts a structure in which the primary side inputs voltage and the secondary side generates different types of volt...

Claims

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Application Information

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IPC IPC(8): H02H7/04
Inventor 许点锡
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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