CN218217747U

CN218217747U - LED driver chip with surge protection

Info

Publication number: CN218217747U
Application number: CN202222437407.3U
Authority: CN
Inventors: 李兰芳; 李文强; 吴培洪
Original assignee: Shenzhen Senliweier Electronics Co ltd
Current assignee: Shenzhen Senliweier Electronics Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2023-01-03
Anticipated expiration: 2032-09-14

Abstract

The utility model relates to a driver chip technical field, concretely relates to LED driver chip with surge protection. The utility model provides a LED driving chip with surge protection, which comprises a mounting plate, a surge absorber, a piezoresistor and the like; the drive chip sets up on the mounting panel, is provided with on the mounting panel to be used for avoiding drive chip to be impacted by the surge absorber of surge current in the twinkling of an eye, still is provided with the piezo-resistor that is used for carrying out the decompression protection to drive chip both ends through the installation foot on the mounting panel, surge absorber, piezo-resistor all with drive chip electric connection. The surge absorber shunts the surge current in the driving chip circuit, so that the high current is prevented from impacting the driving chip; through the conduction of the piezoresistor, the circuits at the two ends of the driving chip are conducted, so that zero voltage at the two ends of the driving chip is realized, and the driving chip is prevented from being broken down by surge voltage.

Description

LED driver chip with surge protection

Technical Field

The utility model relates to a driver chip technical field, concretely relates to LED driver chip with surge protection.

Background

The surge is a peak value exceeding a stable value instantly, and comprises surge voltage and surge current; the source of the surge of the power supply system is divided into an external part (thunder reason) and an internal part (electrical equipment start-stop, failure and the like), wherein the damage of the surge caused by lightning stroke is the largest, and dangerous overvoltage can be generated within the range of 1.5-2 KM by taking the lightning stroke as the center during the lightning stroke discharge.

The LED lamp has the characteristics of high efficiency, reliability, low energy consumption and the like, has very wide application, is usually used for lighting, displaying, signal lamps and the like, but due to the complexity of the LED use environment, especially when the LED is used outdoors, lightning strike is easy to cause a power supply system to generate surge, so that an LED drive circuit and a drive chip are easy to be impacted by the surge, and unnecessary property loss and even casualties are caused; the anti-surge is mainly aimed at the damage of direct lightning, conduction lightning, induction lightning and instantaneous high voltage generated by switch overvoltage to electrical components.

The current LED driving chip is generally only provided with one surge protector, and once the surge protector is damaged by lightning surge, the LED driving chip is in an unprotected state.

Therefore, it is necessary to design an LED driving chip with multi-path surge protection.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome and only rely on surge protector to prevent that surge exists surge protector in case cause LED driver chip to be in the shortcoming of no protect state after impaired, the to-be-solved technical problem of the utility model is to provide a LED driver chip with surge protection.

In order to solve the technical problem, the utility model provides such LED driver chip with surge protection, including the mounting panel, driver chip, surge absorber, installation foot and piezo-resistor, driver chip sets up on the mounting panel, is provided with on the mounting panel to be used for avoiding driver chip to be impacted by transient surge current's surge absorber, still is provided with the piezo-resistor that is used for carrying out the decompression protection to driver chip both ends through the installation foot on the mounting panel, surge absorber, piezo-resistor all with driver chip electric connection.

Preferably, the mounting plate further comprises a ceramic gas discharge tube and a fixing block, the ceramic gas discharge tube used for protecting the working circuit of the driving chip is arranged on the mounting plate through the fixing block, and the ceramic gas discharge tube is electrically connected with the driving chip.

Preferably, the heat dissipation device further comprises a heat dissipation fin, and the side surface of the driving chip is further provided with the heat dissipation fin for accelerating the heat dissipation speed of the driving chip.

Preferably, the electronic device further comprises pins, and the pins which are convenient for the connection of the driving chip and the outside are symmetrically arranged on two symmetrical sides of the driving chip.

Preferably, the protection device further comprises a protection shell, and the upper part of the driving chip is provided with the protection shell for providing damage-proof and pressure-proof protection for the driving chip.

The utility model discloses the beneficial effect who has as follows:

the surge absorber is used for shunting surge current in the driving chip circuit, so that high current is prevented from impacting the driving chip; the conduction of the piezoresistor is realized to conduct the circuits at the two ends of the driving chip, so that the two ends of the driving chip have zero voltage, and the surge voltage is prevented from puncturing the driving chip; through breakdown electrification of the ceramic gas discharge tube, surge voltage is quickly short-circuited to be close to zero voltage, and is quickly short-circuited to be close to zero voltage, so that the circuit of the driving chip is protected, and the driving chip is prevented from being impacted by the surge voltage; through the parallel arrangement of the surge absorber, the piezoresistor and the ceramic gas discharge tube, the multi-path surge protection function of the LED driving chip is realized.

Drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the mounting plate, the driving chip, the pins and other parts of the present invention.

Fig. 2 is a schematic diagram of a three-dimensional structure of the surge absorber, the heat sink and other parts of the present invention.

Fig. 3 is a schematic perspective view of the present invention.

The labels in the figures are: the device comprises a mounting plate 1, a driving chip 2, a cooling fin 21, a pin 3, a surge absorber 4, a piezoresistor 5, a mounting pin 51, a protective shell 6, a ceramic gas discharge tube 7 and a fixing block 71.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1 and 2, an LED driver chip with surge protection, including mounting panel 1, driver chip 2, surge absorber 4, mounting pin 51 and piezo-resistor 5, driver chip 2 sets up on mounting panel 1, there is surge absorber 4 that is used for avoiding driver chip 2 to be impacted by the surge current in the twinkling of an eye through bolted connection on mounting panel 1, still be provided with the piezo-resistor 5 that is used for carrying out decompression protection to driver chip 2 both ends through mounting pin 51 symmetrically on mounting panel 1, mounting pin 51 and piezo-resistor 5 formula design as an organic whole, mounting pin 51 has carried out insulating setting, surge absorber 4, piezo-resistor 5 all with driver chip 2 parallel connection.

As shown in fig. 3, the mounting board 1 is provided with a ceramic gas discharge tube 7 for protecting the operating circuit of the driving chip 2 through the fixing block 71, the fixing block 71 is designed to be insulating, the ceramic gas discharge tube 7 is connected in parallel with the driving chip 2, and one end of the ceramic gas discharge tube 7 is connected to a ground wire.

When the device is used, a worker installs the driving chip 2 on the mounting plate 1, installs the surge absorber 4 and the piezoresistor 5 on the mounting plate 1, and electrically connects the driving chip 2 with the surge absorber 4 and the piezoresistor 5 respectively in a parallel connection mode; install ceramic gas discharge tube 7 on mounting panel 1 through fixed block 71, ceramic gas discharge tube 7 adopts parallelly connected mode to carry out electric connection with drive chip 2, and concrete theory of operation does not: when the circuit of the driving chip 2 is impacted by surge current, the instant surge current generated in the circuit is shunted through the surge absorber 4, so that the impact of the surge current on the driving chip 2 is avoided; meanwhile, when the voltage applied to the piezoresistor 5 exceeds the threshold value of the piezoresistor, the current flowing through the piezoresistor 5 is increased sharply, the piezoresistor 5 is broken down and conducted, and the circuits at the two ends of the driving chip 2 are short-circuited, so that no voltage exists at the two ends of the driving chip 2, the driving chip 2 is protected, and the driving chip 2 is prevented from being broken down by high voltage; when a surge voltage occurs, the ceramic gas is broken down by the high voltage applied to both ends of the ceramic gas discharge tube 7, the gas discharge tube starts to discharge, the high impedance changes into the low impedance, the surge voltage is rapidly short-circuited to near zero voltage, and the overcurrent is released into the ground, thereby realizing the protection of the driver chip 2.

Example 2

As shown in fig. 2, in addition to embodiment 1, the heat sink 21 is further included, and the heat sink 21 for accelerating the heat dissipation speed of the driver chip 2 is further provided on the side surface of the driver chip 2.

The heat dissipation sheet 21 can dissipate heat generated by the driving chip 2 during operation in time, so that the driving chip 2 is prevented from being too high in temperature, and the stability of the driving chip 2 in operation is ensured.

As shown in fig. 1, the liquid crystal display further includes pins 3, and the pins 3 are symmetrically installed on two symmetrical sides of the driving chip 2, so that the driving chip 2 can be connected to the outside.

The arrangement of the pins 3 provides convenience for connecting the driving chip 2 with an external electric appliance.

As shown in fig. 3, a protective shell 6 is further included, and the protective shell 6 for providing damage-proof and pressure-proof protection for the driving chip 2 is installed on the upper portion of the driving chip 2.

The protective shell 6 can provide protection such as pressure prevention, damage prevention and dust prevention for the driving chip 2.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, modifications and substitutions can be made, which are all within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a LED driver chip with surge protection, including mounting panel (1), driver chip (2) and surge absorber (4), driver chip (2) set up on mounting panel (1), be provided with on mounting panel (1) and be used for avoiding driver chip (2) by surge absorber (4) that surge current in the twinkling of an eye strikes, a serial communication port, still including installation foot (51) and piezo-resistor (5), still be provided with piezo-resistor (5) that are used for carrying out decompression protection to driver chip (2) both ends through installation foot (51) on mounting panel (1), surge absorber (4), piezo-resistor (5) all with driver chip (2) electric connection.

2. The LED driving chip with surge protection function according to claim 1, further comprising a ceramic gas discharge tube (7) and a fixing block (71), wherein the ceramic gas discharge tube (7) for protecting the operating circuit of the driving chip (2) is arranged on the mounting board (1) through the fixing block (71), and the ceramic gas discharge tube (7) is electrically connected with the driving chip (2).

3. The LED driving chip with surge protection according to claim 2, further comprising a heat sink (21), wherein the side surface of the driving chip (2) is further provided with a heat sink (21) for accelerating the heat dissipation speed of the driving chip (2).

4. The LED driving chip with surge protection function according to claim 3, further comprising pins (3), wherein the pins (3) for facilitating the connection of the driving chip (2) with the outside are symmetrically installed on two symmetrical sides of the driving chip (2).

5. The LED driving chip with surge protection according to claim 4, further comprising a protective shell (6), wherein the protective shell (6) is mounted on the upper portion of the driving chip (2) for providing protection against damage and voltage for the driving chip (2).