CN210380247U

CN210380247U - Common-mode lightning protection circuit for switch-driven LED lighting lamp

Info

Publication number: CN210380247U
Application number: CN201921730638.5U
Authority: CN
Inventors: 李吉晓
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2020-04-21
Anticipated expiration: 2029-10-16

Abstract

The utility model discloses a common mode lightning protection circuit for switch drive LED illumination lamps and lanterns relates to electronic circuit technical field. The common-mode lightning protection circuit comprises an L line, an N line and a ground wire PE, wherein a piezoresistor RV1 is arranged between the L line and the bottom wire PE of the N line, an RV2 series-connected solid discharge tube TSS realizes common-mode lightning protection through an i circuit, a common-mode inductor LF1 is arranged on the L line and the N line, and a piezoresistor RV3 series-connected discharge tube G1 is respectively connected to two ends of the common-mode inductor LF 1. A capacitor CX1 placed behind the common mode inductor absorbs the peak voltage generated by the common mode surge. The utility model also discloses a realization method of a lightning protection circuit for LED illumination lamps and lanterns. The common-mode surge requirement of 2k-10kV can be easily realized by L-PE and N-PE of phase lines to ground, the leakage current is less than 5mA when the electric strength of the common-mode surge voltage is withstand voltage of 1.6kV60s, the circuit design is simple, and the safety is high.

Description

Common-mode lightning protection circuit for switch-driven LED lighting lamp

Technical Field

The utility model relates to an electronic circuit technical field specifically is a common mode lightning protection circuit for switch drive LED illumination lamps and lanterns.

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, and good heat dissipation conditions need to be matched, the LED board needs to be an aluminum substrate with low cost and good heat dissipation, but the lightning surge resistance effect of the aluminum substrate is poor. How to enable the switch 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 common-mode lightning protection effect of the switch-driven LED lighting fixture is urgently needed.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a simple structure, cost are cheap, use conveniently, the good common mode lightning protection circuit who is used for switch drive LED illumination lamps and lanterns of lightning protection effect and security.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a common-mode lightning protection circuit for a switch-driven LED lighting lamp comprises an L line, an N line and a PE line. A current fuse, three piezoresistors, a gas discharge tube and a solid discharge tube are arranged on an L line, wherein the three piezoresistors are a first piezoresistor RV1, a second piezoresistor RV2 and a third piezoresistor RV3 respectively. And a common-mode inductor and a capacitor are arranged between the L line and the N line.

Preferably, the third piezoresistor RV3 and the gas discharge tube G1 are connected with the common-mode inductor first pin and the second pin.

Preferably, one end of the first voltage dependent resistor RV1 is connected to the L line, and the other end is connected in series with the solid discharge tube TSS and then connected to the ground PE.

Preferably, one end of the second piezoresistor RV2 is connected to the N line, and the other end is connected in series with the solid discharge tube TSS and then connected to the ground PE.

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 RV3 series gas discharge tube G1 of the third varistor are respectively connected to 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 voltage of the three piezoresistors is 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.

When L line or N line has instantaneous high voltage to ground line PE, piezoresistors RV1 and RV2 and solid discharge tube TSS form an absorption discharge loop. When the first voltage dependent resistor RV1 and the second voltage dependent resistor RV2 are conducted with the solid discharge tube TSS, the circuit i has a conducting time, which is generally nanosecond. This voltage normally produces a higher spike voltage after being discharged after being stored through the common mode inductor device in the switch drive. The third voltage dependent resistor RV3 is connected in series with the gas discharge tube G1 and the capacitor CX1, so that spike voltage sudden change generated after the common mode absorption circuit is subjected to inductance pair can be restrained. The third voltage dependent resistor RV3 is connected in series with the gas discharge tube G1 and the capacitor CX1, so that spike voltage sudden change generated after the common mode absorption circuit is subjected to inductance pair can be restrained.

The utility model provides a switch drive LED lamps and lanterns common mode lightning protection circuit through adding piezo-resistor RV1 respectively at L line, N line, RV2 series connection solid discharge tube TSS constitutes main absorption circuit, in this main absorption circuit, can produce when thunderbolt surge voltage switches on through solid discharge tube and switch on higher residual pressure in the twinkling of an eye. The peak voltage that can produce the nanosecond when main absorption circuit switches on can vibrate through the inside common mode inductance of switching power supply to can produce higher peak residual voltage and need use piezo-resistor RV3 series gas discharge tube G1 and constitute the peak voltage suppression absorption that the oscillation suppression circuit will vibrate with common mode inductance LF1 and electric capacity CX1 electric capacity. Like this through switch drive after the residual voltage on the LED lamp plate will fall to safe voltage, be unlikely to damage LED lamp pearl.

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 described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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 exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, a common-mode lightning protection circuit for a switch-driven LED lighting fixture includes a main high-voltage large-current common-mode lightning stroke absorption i circuit formed by serially connecting a current fuse on an L line, an N line, and a ground line PEL, a voltage dependent resistor RV1 connected between an L, N line and the ground, and a solid discharge tube TSS connected in series to RV 2.

For example, as shown in fig. 1, a varistor RV3 is connected in series with a gas discharge tube G1, a common mode inductor LF1 and a capacitor CX1 to form a residual voltage spike suppression absorption circuit.

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

In this embodiment, the voltage dependent resistors RV1 and RV2 are 10D821K of Guangdong Hongzhi electronic Limited

In this embodiment, the solid discharge tube is Shanghai Baogong electronic BIS-AR602

In the embodiment, the voltage dependent resistor RV3 is 10D391K of Guangdong Hongzhi electronic Co., Ltd

In this embodiment, the gas discharge tube G1 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

The implementation method of the common-mode lightning protection circuit for the switch-driven LED lighting lamp comprises the following steps:

(1) when the L line or the N line has instantaneous high voltage to the ground line PE, the high-voltage heavy current generated by lightning strike is clamped and absorbed by a main absorption clamp circuit i consisting of solid discharge tubes TSS connected in series through a common-mode absorption piezoresistor RV1 or RV 2.

(2) When the voltage is higher than the breakdown voltage of the piezoresistor RV1 or RV2 and the solid discharge tube TSS, the piezoresistor and the solid discharge tube form an absorption loop to quickly discharge high-voltage large current to the ground. And the voltage of the device is required to meet the 1600Vac insulation withstand voltage requirement.

With the above-described structure and method, a relatively high peak voltage of 1600 × V2 — 2263V is also generated when the voltage dependent resistors RV1, RV2 and the solid discharge tube TSS are turned on. The voltage will oscillate continuously through the common mode inductor inside the switch driver, and thus a higher pulse voltage will be generated.

According to the structure and the method, the piezoresistor RV3 is connected with the two ends of the first pin and the second pin of the common-mode inductor LF1 in series to form the gas discharge tube G1, and the high-voltage oscillation in the inductor is restrained by utilizing the voltage clamping advantage of the piezoresistor and the characteristic of a gas discharge tube switch, so that the spike voltage generated when a solid transistor is conducted is absorbed by the capacitor CX1 at the back. Thereby the purpose of greatly reduced output residual voltage has been reached to guarantee that LED lamp pearl is difficult to be damaged by the thunderbolt. And meanwhile, the suppression effect of the common-mode inductor on the EMI (electro-magnetic interference) is not influenced.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a common mode lightning protection circuit for switch drive LED illumination lamps and lanterns, includes L line and N line and also has the PE line, its characterized in that: the L line is provided with a current fuse, three piezoresistors, 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, the third piezoresistor RV3 and the gas discharge tube G1 are connected with a first pin and a second pin of the common-mode inductor, one end of the first piezoresistor RV1 is connected to the solid discharge tube TSS at the other end of the L line in series and then connected to the ground wire PE, one end of the second piezoresistor RV2 is connected to the solid discharge tube TSS at the other end of the N line in series and then connected to the ground wire PE, and two ends of the gas discharge tube G1 connected to the third piezoresistor RV3 are connected with the first pin and the second pin of the common.

2. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the solid discharge tube is a solid discharge tube with 800-2000V selected from the same solid discharge tube.

3. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the voltage of the gas discharge tube is selected to be between 200V and 2000V.

4. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the voltage of the three voltage dependent resistors is 240V-1000V.

5. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the voltage of the solid discharge tube is 800V-2000V.

6. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the current fuse selects 1A-10A slow fusing current fuse.

7. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the common mode inductor selects an inductor of 5-50 millihenries.

8. The common-mode lightning protection circuit for a switch-driven LED lighting fixture of claim 1, wherein: the capacitance is selected to be 0.001-1 microfarad.