CN110635464A

CN110635464A - Common-mode lightning protection circuit of LED lighting lamp

Info

Publication number: CN110635464A
Application number: CN201910981139.1A
Authority: CN
Inventors: 李吉晓
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2019-12-31

Abstract

The invention discloses a common-mode lightning protection circuit of an LED lighting lamp, and relates to the technical field of electronic circuits. The circuit comprises an L line and an N line, wherein a current fuse is connected in series on the L line, a common-mode inductor LF1 is connected in series on the L line and the N line, a gas discharge tube G1 is connected in series with a piezoresistor RV1 and then connected in parallel between a first pin and a second pin of the common-mode inductor LF1, a capacitor CX1 is connected between the L line and the N line in a bridging manner, when instant high voltage enters the L line and the N line, instant high voltage is generated between the 1 st pin, the 2 nd pin and the 4 th pin and the 3 rd pin of the common-mode inductor; the high voltage can be absorbed by a clamping circuit consisting of the gas discharge tube and the piezoresistor to prevent the high voltage oscillation of the inductor; the redundant peak voltage is absorbed by the principle that the voltage at two ends of the capacitor cannot change suddenly.

Description

Common-mode lightning protection circuit of LED lighting lamp

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a common-mode lightning protection circuit of an LED lighting lamp.

Background

With the development of electronic and communication technologies, electronic products are applied more and more in life, and the switch-driven LED lamp has replaced the traditional incandescent lamp and tungsten lamp, and has high efficiency and high luminous flux. Becoming the mainstream lighting product today. Because the LED lamp beads are sensitive to static electricity and have poor lightning surge resistance, how to drive the LED lighting lamp to stably work under the harsh lightning condition becomes a problem to be solved urgently. Therefore, a lightning protection circuit capable of improving the lightning protection effect of the switch-driven LED lighting fixture is urgently needed. The circuit perfectly solves the 0.5kV-10kV lightning protection problem.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the common-mode lightning protection circuit for the switch-driven LED lighting lamp, which has the advantages of simple structure, low manufacturing cost, convenient application, good lightning protection effect and good safety.

In order to achieve the purpose, the invention is realized by the following technical scheme: a common-mode lightning protection circuit for a switch-driven LED lighting lamp comprises an L line and an N line, wherein a current fuse, two piezoresistors, a gas discharge tube and a solid discharge tube are arranged on the L line, and the two piezoresistors are a first piezoresistor RV1 and a second piezoresistor RV2 respectively. A common-mode inductor and a capacitor are arranged between the L line and the N line, and the first gas discharge tube G1 is connected in series with a first voltage dependent resistor in parallel between pins 1 and 2 of the common-mode inductor.

And comprises the following steps:

when the L line and the N line have instant high voltage to enter, the 1 st pin, the 2 nd pin, the 4 th pin and the 3 rd pin of the common mode inductor generate instant high voltage

The high voltage is absorbed by a clamping circuit consisting of a gas discharge tube and a piezoresistor.

The redundant peak voltage is absorbed by the principle that the voltage at the two ends of the capacitor can not change suddenly, so that the rear-stage circuit works in the normal range of voltage.

The current fuse is connected in series with the L line, and the gas discharge tube G1 is connected in series with a voltage-sensitive RV1 and then connected in parallel between the 1 st pin and the 2 nd pin of the common-mode inductor. A safety capacitor CX1 is connected in front of the L line and the N line in a bridging mode, the fuse is selected from slow fusing current fuses 1A-10A, the piezoresistor is selected from 240V-1000V, the gas discharge tube is selected from 100V-2000V, and the common mode inductor is selected from 5-50 millihenries. The capacitance is selected to be 0.001-1 microfarad.

Preferably, a safety capacitance CX1 is bridged between the L line and the N line.

Preferably, the current fuse is selected from 1A-10A slow fusing current fuse.

Preferably, the first gas discharge tube G1 is selected to be a 100V-2000V gas discharge tube.

Preferably, the solid discharge tube is a solid discharge tube of 800-2000V selected from the same solid discharge tube.

Preferably, two ends of the third pressure-sensitive RV3 series gas discharge tube G1 are respectively connected with the first pin and the second pin of the common-mode inductor.

Preferably, the voltage of the gas discharge tube is selected to be between 200V and 2000V.

Preferably, the three voltage-sensitive voltages are 240V-1000V.

Preferably, the voltage of the solid discharge tube is selected from 800V to 2000V.

Preferably, the current fuse is selected from 1A-10A to slowly blow the current fuse.

Preferably, the common mode inductance is selected to be 5-50 millihenries of inductance.

Preferably, the capacitance is selected to be 0.001-1 microfarad.

The invention provides a common-mode lightning protection circuit of an LED lighting lamp. The method has the following beneficial effects:

the high-energy lightning protection circuit comprises an L line and an N line, wherein a current fuse is connected in series on the L line, a common-mode inductor LF1 is connected in series on the L line and the N line, a gas discharge tube G1 is connected in series with a piezoresistor RV1 and then connected in parallel between a first pin and a second pin of the common-mode inductor LF1, and a capacitor CX1 is connected between the L line and the N line in a bridging manner.

Drawings

FIG. 1 is a circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1, the present invention provides a technical solution: as shown in fig. 1, a lightning protection circuit for an open-differential driving LED lighting fixture includes an L line and an N line, wherein a current fuse is connected in series to the L line, and a common mode inductor is connected to the L line and the N line. The gas discharge tube G1 on the L line is connected with the piezoresistor RV1 in series and is arranged between the 1 st pin and the 2 nd pin of the common-mode inductor LF 1. A capacitance CX1 is connected between the L line and the N line.

For example, as shown in fig. 1, a piezoresistor RV1 is connected in series with a gas discharge tube and then connected in parallel with a common mode inductor LF1 and a capacitor CX1 to form a transient suppression circuit for absorbing lightning surge voltage.

In this embodiment, the current fuse is 2410BC250-0630G 6.3A/250V, Shanghai Baogong electronic Co., Ltd

The voltage dependent resistor RV1 in this embodiment is 10D391K from Guangdong Hongzhi electronics, Inc

In this embodiment, the gas discharge tube is Shanghai Baogong electronic B2G6SA-601M-E5

The inductor of the present embodiment is a common mode inductor of model EE13 manufactured by ten thousand positive electronic limited company of Zhejiang of 30 millihenry.

The inductor of the embodiment is the MPX/MKP X2 metalized polypropylene film anti-interference capacitor produced by Songta electronics of 0.22 microfarads

When in work: when the L line and the N line have instant high voltage, instant high voltage is generated between the 1 st pin, the 2 nd pin, the 4 th pin and the 3 rd pin of the common mode inductor; the high voltage can be absorbed by a clamping circuit consisting of the gas discharge tube and the piezoresistor to prevent the high voltage oscillation of the inductor; the redundant peak voltage is absorbed by the principle that the voltage at the two ends of the capacitor can not change suddenly, so that the rear-stage circuit works in the normal range of voltage.

Claims

1. The utility model provides a lightning protection circuit for switch drive LED illumination lamps and lanterns, includes L line and N line, its characterized in that: the L line is provided with a current fuse, the two piezoresistors are a gas discharge tube and a solid discharge tube, a common-mode inductor and a capacitor are arranged between the L line and the N line, and the first gas discharge tube G1 is connected in series with the first piezoresistor in parallel between a pin 1 and a pin 2 of the common-mode inductor.

2. The common-mode lightning protection circuit of the LED lighting fixture according to claim 1, wherein: and a safety capacitor is connected between the L line and the N line in a bridging manner.

3. The common-mode lightning protection circuit of the LED lighting fixture according to claim 1, wherein: the current fuse selects 1A-10A slow fusing current fuse.

4. The common-mode lightning protection circuit of the LED lighting fixture according to claim 1, wherein: the first of said gas discharge tubes G1 was selected to be a 100V-2000V gas discharge tube.

5. The common-mode lightning protection circuit of the LED lighting fixture as claimed in claim 4, wherein: the piezoresistor RV1 selects a piezoresistor of 240V-1000V.

6. The common-mode lightning protection circuit of the LED lighting fixture according to claim 5, wherein: the common mode inductor selects an inductor of 5-50 millihenries.

7. The common-mode lightning protection circuit of the LED lighting fixture as claimed in claim 6, wherein: the capacitance is selected to be 0.001-1 microfarad.

8. The common-mode lightning protection circuit of the LED lighting fixture according to claim 1, wherein: the current fuse fuses 1A-10A slowly, the voltage dependent resistor is 240V-1000V, the gas discharge tube is 100V-2000V, and the common mode inductor is 5-50 millihenry. The capacitance is selected to be 0.001-1 microfarad.