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Over-voltage protection circuit

A technology for protecting circuits and overvoltage, which is applied in the direction of protection against overvoltage, etc., and can solve the problems of increasing the number of application components, increasing the cost, and complicating the overall circuit

Inactive Publication Date: 2008-06-25
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned overvoltage protection circuit 12 of the prior art can indeed have the effect of protecting the load 16, but if the voltage source 10 returns to normal, the detection response circuit 122 fails to detect and then resets the interruption circuit 121, so that the load 16 can continue Work, causing troubles for designers, often in order to make the overall circuit have an automatic reset function, and further design the reset circuit, which invisibly increases the number of application components, makes the overall circuit more complicated, and causes a relative increase in cost

Method used

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Embodiment Construction

[0037] Please refer to the second figure, which is a functional block diagram of the overvoltage protection circuit 2 of this case; a voltage source 20 shown in the figure is also used to provide a voltage, and a primary side contact 251 of a transformer 25 is directly electrically connected to the voltage source 20, its secondary side contact 252 is electrically connected to one end of an overvoltage protection circuit 22, and the other end of the overvoltage protection circuit 22 is electrically connected to a load 26, wherein the load 26 can be any electrical equipment, such as The other end of the overvoltage protection circuit 22 is electrically connected to a grounding end 28 .

[0038] The above-mentioned overvoltage protection circuit 22 provides detection of the voltage from the secondary side contact 252 of the transformer 25. When the voltage value exceeds a preset voltage value, the overvoltage protection circuit 22 will cut off an output line of the load 26, so tha...

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PUM

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Abstract

The protective circuit of overvoltage protection is connected between a contact at secondary side of transformer and a load. When voltage at the contact at secondary side is abnormal, the protective circuit can cut off online of load directly to protect the load from damage; when voltage at the contact at secondary side returns back to normal, the protective circuit can resume to supply power to load directly.

Description

technical field [0001] The present invention relates to an overvoltage protection circuit, especially one that is electrically connected between a secondary side contact of a transformer and a load. When the output current of the transformer produces an overvoltage state, the circuit can be directly cut off to protect the load. An overvoltage protection circuit. Background technique [0002] Basically, if you want an electrical device to work normally, you need a voltage source to provide voltage, drive the current to flow through the electrical device, and make the electrical device do work to produce the functions we need; at this time, for To make the voltage source provide an appropriate voltage, the voltage provided by the voltage source can be adjusted by a voltage regulator before it enters the electrical equipment; however, based on safety considerations, an overvoltage protection circuit is often required between the electrical equipment and the voltage source , so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20
Inventor 张裕青吴明佳郭钟荣
Owner DELTA ELECTRONICS INC