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A surge protection circuit and surge protector

A surge protection and circuit technology, applied in the field of circuits, can solve the problems of power consumption and volume increase of surge protectors, and achieve the effects of reducing power consumption, avoiding energy consumption, and fast response

Active Publication Date: 2019-01-15
SICHUAN ZHONGGUANG LIGHTNING PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the inventor found that with the increase of the load current, the cross-sectional area of ​​the inductor used increases and at the same time, the internal resistance also increases, which increases the power consumption and volume of the surge protector.

Method used

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  • A surge protection circuit and surge protector
  • A surge protection circuit and surge protector
  • A surge protection circuit and surge protector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 2 As shown, it is a schematic circuit diagram of a surge protection circuit provided by an embodiment of the present invention. The surge protection circuit includes: a varistor MOV, a gas discharge tube GDT, a transient diode TVS, a boost circuit 10 and a rectifier circuit 20.

[0041] The connection relationship of each device is:

[0042] The first end of the varistor MOV is respectively connected to the positive input end of the external power supply ( figure 2 The + end of the In side of the middle) is connected to one end of the transient diode TVS, and serves as the positive output end of the surge protection circuit. The second end of the piezoresistor MOV is respectively connected to the input end of the gas discharge tube GDT and the output end of the rectification circuit 20 . The other end of the transient diode TVS is connected to the input end of the boost circuit 10 . The output end of the boost circuit 10 is connected to the input en...

Embodiment 2

[0046] On the basis of the above embodiments, the surge protection circuit provided by this embodiment further includes a varistor group connected in parallel with the varistor, and the varistor group includes at least one varistor. In this embodiment, the varistor group adopts three resistors connected in parallel, namely image 3 RV1, RV2, and RV3 in .

[0047] More specifically, the rectifier circuit in this embodiment may also be a circuit structure composed of a rectifier bridge and a pull-up current limiting circuit.

[0048] It should be noted that, in this embodiment, the transient diode is a unidirectional transient diode.

[0049] Its circuit connection relationship is:

[0050]The first end of the rectifier bridge is connected to the output end of the gas discharge tube through the pull-up current limiting circuit, the second end of the rectifier bridge is connected to one end of the secondary winding of the transformer, and the rectifier bridge The third end of ...

Embodiment 3

[0055] This embodiment is based on the second embodiment, and the structure of the pull-up current limiting circuit is changed. In this embodiment, as Figure 4 As shown, the pull-up current limiting circuit includes a diode and a current limiting resistor, the anode of the diode is connected to the output end of the gas discharge tube, and the cathode of the diode is connected to the first end of the rectifier bridge through the resistor.

[0056] In this embodiment, a pull-down current limiting circuit is added. Specifically, the pull-down current limiting circuit includes a diode and a current limiting resistor, the anode of the diode is connected to the first end of the varistor, and the cathode of the diode is connected to the first end of the rectifier bridge through the resistor.

[0057] It should be noted that, in this embodiment, the transient diode is a bidirectional transient diode.

[0058] Its operating principle is identical with embodiment two, is:

[0059] A...

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PUM

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Abstract

A surge protection circuit, comprising: a varistor, a gas discharge tube, a transient diode, a boosted circuit and a rectifying circuit. A current of the transient diode is collected by means of the boosted circuit, and a high voltage is generated; then by means of the rectifying circuit, the high voltage is rectified into a trigger high voltage capable of triggering the gas discharge tube, the gas discharge tube can thus be triggered to switch on, such that a high current is discharged by means of the varistor in series connection with a gas discharge tube branch at moments of thunder, lightning and the like. It is thus clear that by adopting the present solution, the transient diode has fast response speed under impact of thunder and lightning currents; while discharging parts of the thunder and lightning currents, the currents are collected, and by means of the boosted circuit and the rectifying circuit triggering the varistor in series connection with a gas discharge tube branch, most of the thunder and lightning currents are discharged. In addition, the present solution does not require an inductor, and the circuit is small in size; without an inductor consuming energy, and power consumption of the whole surge protection circuit is reduced. Besides, the transient diode in the present solution has the function of clamp voltage, and a limiting voltage of a surge protective device can be reduced.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to a surge protection circuit and a surge protector. Background technique [0002] With the continuous development of technology, electronic devices have become an indispensable part of our daily life. Due to lightning, start-stop or failure of electronic equipment, etc., it will cause instantaneous overvoltage or overcurrent inside the electronic equipment, and then burn the electronic equipment. [0003] Currently, surge protectors are often used to protect electronic equipment. As shown in Fig. 1, the schematic circuit diagrams of conventional surge protectors (SPDs) are shown respectively, Figure 1a It is the traditional parallel SPD circuit diagram, Figure 1b and Figure 1c It is a traditional series SPD circuit diagram. Now with Figure 1c As an example, the working principle of the existing SPD is introduced. [0004] The surge protection circuit includes a varistor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H9/06
CPCH02J9/04
Inventor 陈茂森程大川杨国华雷成勇
Owner SICHUAN ZHONGGUANG LIGHTNING PROTECTION TECH