A lightning protection circuit

A lightning protection circuit and circuit technology, used in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as heat and fire, power module burning, power cabinet fire, etc.

CN104882870BActive Publication Date: 2018-03-09HUAWEI DIGITAL POWER TECH CO LTD
4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-03-09

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a lightning protection circuit, which belongs to the technical field of power supply protection. Described lightning protection circuit comprises: electromagnetic compatibility EMC filter circuit and voltage clamping circuit; Described voltage clamping circuit is connected in parallel at the two ends of a winding of common-mode inductance in described EMC filter circuit; When described common-mode inductance After the induced voltage exceeds the corresponding operating voltage of the voltage clamping circuit, the voltage clamping circuit is turned on and clamps the induced voltage at the clamping voltage corresponding to the voltage clamping circuit. The lightning protection circuit provided by the invention can prevent the power module from being burned and the power cabinet from fire.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field

[0001] The invention relates to the technical field of power supply protection, in particular to a lightning protection circuit. Background technique

[0002] At present, the power supply module is usually installed in the power supply cabinet. During the thunderstorm season, the power supply cabinet may be struck by lightning. In order to avoid damage to the power supply module in the power supply cabinet by the lightning strike, a lightning protection circuit needs to be provided in the power supply module.

[0003] Such as Picture 1-1 As shown, there is a lightning protection circuit in the prior art, including: EMC (Electro Magnetic Compatibility, electromagnetic compatibility) filter circuit 1 (the part outside the dashed box in the figure) and the common mode protection circuit S2 (the inside of the dashed box in the figure) section). The EMC filter circuit 1 includes a third varistor RV3, a first common mode inductor L1, a first fuse F1, a second fuse F2, a ...

Examples

Embodiment 1

[0052] Such as Figure 1-2 with 2 As shown, the embodiment of the present invention provides a lightning protection circuit, including: an EMC filter circuit 1 and a voltage clamping circuit 2.

[0053] The voltage clamping circuit 2 is connected in parallel with both ends of a winding of the first common mode inductor L1 in the EMC filter circuit 1, Figure 1-2 The medium voltage clamping circuit 2 is connected in parallel with both ends of the first winding of the first common mode inductor L1, figure 2 The medium voltage clamping circuit 2 is connected in parallel with both ends of the second winding of the first common mode inductor L1;

[0054] When the induced voltage of the first common mode inductor L1 exceeds the operating voltage corresponding to the voltage clamping circuit 2, the voltage clamping circuit 2 is turned on and clamps the induced voltage to the clamping voltage corresponding to the voltage clamping circuit 2.

[0055] Among them, the voltage clamping circuit 2...

Embodiment 2

[0077] See Figure 15 , The embodiment of the present invention provides a lightning protection circuit, including: an EMC filter circuit and a plurality of voltage clamping circuits;

[0078] The EMC filter circuit includes a plurality of common mode inductors, the voltage clamping circuit corresponds to the common mode inductor one to one, and the two ends of a winding of the common mode inductor are connected in parallel with the corresponding voltage clamping circuit.

[0079] Wherein, when the induced voltage of the common mode inductor exceeds the corresponding operating voltage of the corresponding voltage clamping circuit, the voltage clamping circuit turns on and clamps the induced voltage to the clamping voltage corresponding to the voltage clamping circuit.

[0080] Among them, in Figure 15 The lightning protection circuit includes voltage clamping circuits 2 and 3, and the EMC filter circuit includes a first common mode inductor L1 and a second common mode inductor L2. T...