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Protection circuit

A protection circuit, a technology to be protected, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. question

Pending Publication Date: 2020-10-30
上海宝宫实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the equivalent effect of parasitic capacitance and parasitic inductance in electronic circuit design, the switching element will act in advance, that is, the voltage at both ends of the switching element and the clamping element cannot reach the preset non-operating voltage, which may cause short circuit, electric shock or even fire and other safety hazards, affecting the normal operation of the circuit
In addition, the surge will cause complex charging and discharging of the equivalent capacitance between lines, which will cause greater damage to switching elements, especially semiconductor switching elements, so the protection circuit needs to be improved

Method used

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Experimental program
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Embodiment 1

[0044] refer to image 3 , is a protection circuit disclosed in the present invention, comprising a clamping element 1 electrically connected, a switching element 2 connected in series with the clamping element 1 , and a first line compensation module 3 connected in parallel with the switching element 2 . The two ends of the clamping element 1 and the switching element 2 connected in series are electrically connected to the two terminals of the main protection circuit. Clamp element 1 is set as MOV or TVS. The switching element 2 is configured as a GDT, a TSS, a thyristor, a glass gas discharge tube or a discharge gap.

[0045] The first line compensation module 3 includes a capacitor C1.

[0046] refer to Figure 4 , the first line compensation module 3 further includes a resistor R1 connected in series with the capacitor C1.

[0047] In addition, there may be multiple capacitors C1 and multiple resistors R1 , and the resistors R1 and capacitors C1 may be connected in serie...

Embodiment 2

[0062] refer to Figure 11 , is a protection circuit disclosed in the present invention, comprising a clamping element 1 electrically connected, a switching element 2 connected in series with the clamping element 1 , and a first line compensation module 3 connected in parallel with the switching element 2 . The clamping element 1 is electrically connected to one terminal of the protected circuit, and the other end is electrically connected to one end of the switching element 2 . The first line compensation module 3 includes a capacitor C1. Clamp element 1 is set as MOV or TVS. The switching element 2 is configured as a GDT, a TSS, a thyristor, a glass gas discharge tube or a discharge gap.

[0063] The difference from Embodiment 1 is that the switching element 2 is also connected in series with a second line compensation module 4, and one end of the second line compensation module 4 is electrically connected to one end of the switching element 2 of the clamping element 1 and...

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PUM

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Abstract

The invention relates to the technical field of surge protection. The invention discloses a protection circuit. The circuit comprises a clamping element, a switch element, a first circuit compensationmodule and a second circuit compensation module which are electrically connected. The first circuit compensation module comprises a capacitor C1 and a resistor R1. The second circuit compensation module comprises an inductor L1, wherein one end of the clamping element is electrically connected to one wiring end of a protected circuit, the other end of the clamping element is electrically connected to one end of the switch element, the other end of the switch element is electrically connected to the other wiring end of the protected circuit, and the first circuit compensation module is connected to the two ends of the switch element in parallel. The surge protection circuit has the effect of improving the insulation and surge test reliability of the surge protection circuit.

Description

technical field [0001] The invention relates to the technical field of surge protection, in particular to a protection circuit. Background technique [0002] Surge mainly refers to the powerful pulse generated instantaneously in the circuit. Since the surge voltage may be much higher than the rated working voltage of the power supply, it is likely to cause the circuit to be destroyed at the moment the surge occurs, such as PN junction capacitance breakdown , Resistor burnout, etc. This requires a surge protector for protection. A surge protector is generally composed of several discharge units. For example, in a power supply lightning protection circuit, multiple components and multi-level protection circuits are required. [0003] In the surge protection circuit design of existing equipment, refer to figure 1 , the protection device uses a clamping element, such as a single zinc oxide varistor MOV; refer to figure 2 , The protection device uses a combination of clamping...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/00H02H9/04H02H9/06
CPCH02H9/005H02H9/04H02H9/06
Inventor 李吉晓余国华谢军毅任永杰
Owner 上海宝宫实业有限公司