CN210781447U

CN210781447U - LED driver

Info

Publication number: CN210781447U
Application number: CN201920382441.0U
Authority: CN
Inventors: 张从峰; 杨宏
Original assignee: Baldurs New Energy Technology Co ltd
Current assignee: Baldurs New Energy Technology Co ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2020-06-16
Anticipated expiration: 2029-03-25

Abstract

An LED driver, comprising: the conductive screw, the shell and the driving circuit are arranged in the shell; the driving circuit comprises an overvoltage protection circuit, the overvoltage protection circuit is provided with an overvoltage protection grounding terminal, the grounding terminal of the driving circuit except the overvoltage protection circuit is an ordinary grounding terminal, and the overvoltage protection grounding terminal is not connected with the ordinary grounding terminal on a circuit board of the driving circuit; a patch nut is arranged on a circuit board of the driving circuit, and an overvoltage protection grounding end is connected to the patch nut. The shell is provided with a through hole of a conductive screw, and the conductive screw penetrates through the through hole and is connected with the patch nut. When the LED driver is subjected to a withstand voltage test, the conductive screw can be removed from the outside of the shell, namely, the connection between the grounding end of the overvoltage protection circuit and the ordinary grounding end is disconnected.

Description

LED driver

Technical Field

The utility model belongs to the technical field of the LED drive technique and specifically relates to a LED driver is related to.

Background

In order to ensure that the electrical equipment is not damaged in a surge condition, an overvoltage protection circuit, such as a lightning protection circuit designed to be not damaged by lightning, is usually arranged at an input end of the electrical equipment; LED drivers typically employ a common mode lightning protection circuit connected between the power supply and ground; the common-mode lightning protection circuit is generally formed by connecting a piezoresistor and a gas discharge tube in series, and in order to ensure the lightning protection effect, the withstand voltage of the gas discharge tube cannot be too large. However, the LED driver also needs to be subjected to a withstand voltage test, and in order to ensure that the withstand voltage test passes, the gas discharge tube with higher cost needs to be selected, and the discharge voltage of the gas discharge tube is often higher, so that the gas discharge tube can be prevented from being damaged in the test process.

In order to solve the trade-off problem between the withstand voltage of the gas discharge tube and the cost, at present, the common-mode lightning protection circuit is usually disconnected from the ground during the withstand voltage test, and only the main circuit of the LED driver is tested; however, in the prior art, the ground terminal of the common-mode lightning protection circuit is connected inside the conductive housing of the LED driver, and the conductive housing is connected to the ground, and the common-mode lightning protection circuit needs to be disconnected from the ground only by disassembling the conductive housing, which makes the testing procedure complicated and increases the testing cost, especially for the driver that is subjected to the glue filling process, and may damage other devices.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a LED driver to solve the problem that withstand voltage test step is loaded down with trivial details and gas discharge tube lectotype among the prior art.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

an LED driver, comprising: the conductive screw, the shell and the driving circuit are arranged in the shell; the driving circuit comprises an overvoltage protection circuit, the overvoltage protection circuit is provided with an overvoltage protection grounding terminal, the grounding terminal of the driving circuit except the other part of the overvoltage protection circuit is a common grounding terminal, and the overvoltage protection grounding terminal is not connected with the common grounding terminal on a circuit board of the driving circuit; a patch nut is arranged on a circuit board of the driving circuit and is conductive, and the overvoltage protection grounding end is connected to the patch nut.

Preferably, the overvoltage protection circuit is a common-mode lightning protection circuit.

Preferably, the casing is provided with a threading hole, and an input line, an output line and a dimming line of the LED driver pass through the threading hole and are connected with a driving circuit arranged in the casing.

Preferably, the shell is a conductive shell, the conductive shell is provided with a through hole of the conductive screw, the conductive screw penetrates through the through hole and is connected with the patch nut, and the conductive shell is connected with the ordinary grounding end; thus, the conductive shell is connected to the overvoltage protection grounding end through the conductive screw and the patch nut; meanwhile, the conductive shell is connected with the ordinary grounding end; therefore, under the normal use state, the overvoltage protection grounding end is connected with the ordinary grounding end and the conductive shell, and the overvoltage protection circuit is in the working state; when the LED driver is used for carrying out voltage withstand test, the conductive screw can be detached from the outside of the conductive shell, namely, the grounding end of the overvoltage protection circuit is disconnected from the common grounding end and the conductive shell, the voltage withstand test of the driving circuit in the LED driver can be realized without the step of detaching the conductive shell in the prior art, and the problem of complicated voltage withstand test steps in the prior art is solved.

Preferably, a second patch nut is arranged on the circuit board of the driving circuit, the second patch nut is conductive, the ordinary ground terminal is connected to the second patch nut, the patch nut and the second patch nut are respectively arranged on the front side and the back side of the circuit board of the driving circuit, the casing is provided with a through hole of the conductive screw, and the conductive screw penetrates through the through hole and is connected with the patch nut and the second patch nut; therefore, in a normal use state, the patch nut is connected with the second patch screw through the conductive screw, the overvoltage protection grounding end is connected with the ordinary grounding end, and the overvoltage protection circuit is in a working state; when the LED driver is used for carrying out voltage withstand test, the conductive screw can be detached from the outside of the shell, namely, the connection between the patch nut and the second patch nut is disconnected, so that the overvoltage protection grounding end and the ordinary grounding end are separated, the voltage withstand test of the driving circuit in the LED driver can be realized without the step of disassembling the shell in the prior art, and the problem that the voltage withstand test step in the prior art is complicated is solved.

Drawings

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention will be combined below to describe the technical solution in the embodiments of the present invention.

Fig. 1 is a circuit schematic diagram of a driving circuit of an LED driver provided in the present application;

fig. 2 is a schematic structural diagram of an LED driver according to an embodiment of the present disclosure;

fig. 3 is another schematic structural diagram of an LED driver according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of an LED driver according to a second embodiment of the present application;

fig. 5 is another schematic structural diagram of an LED driver according to a second embodiment of the present application.

Detailed Description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The utility model provides a LED driver to solve the loaded down with trivial details problem of withstand voltage test step among the prior art.

Example one

Specifically, the LED driver includes: the conductive screw, the shell and the driving circuit are arranged in the shell; the driving circuit comprises an overvoltage protection circuit, the overvoltage protection circuit is provided with an overvoltage protection grounding terminal, the grounding terminal of the driving circuit except the other part of the overvoltage protection circuit is a common grounding terminal, and the overvoltage protection grounding terminal is not connected with the common grounding terminal on a circuit board of the driving circuit; a patch nut is arranged on a circuit board of the driving circuit and is conductive, and the overvoltage protection grounding end is connected to the patch nut.

Fig. 1 is a circuit schematic diagram of a driving circuit of an LED driver provided in the present application; in fig. 1, the overvoltage protection circuit has an overvoltage protection ground terminal, the ground terminal of the driving circuit except the other part of the overvoltage protection circuit is an ordinary ground terminal, and the live wire and the zero wire of the input alternating current and the positive and negative terminals of the output voltage are respectively connected to the ordinary ground terminal through a common-mode capacitor; on the circuit board of the driving circuit, the overvoltage protection ground terminal is not connected to the ordinary ground terminal.

Fig. 2 is a schematic structural diagram of an LED driver according to an embodiment of the present disclosure; the conductive shell 101 is provided with a through hole 103 of the conductive screw 102, and the conductive screw 102 passes through the through hole 103 and is connected with the patch nut 104; the patch nut 104 is soldered to a circuit board 105 of the drive circuit. The through hole 103 in fig. 2 is covered by the conductive screw 102, not shown.

Another schematic structural diagram of an LED driver provided in the first embodiment of the present application is shown in fig. 3, a conductive housing 101 is provided with a through hole 103 of the conductive screw 102, and a patch nut 104 is welded on a circuit board 105 of a driving circuit; the conductive screw 102 does not pass through the through hole 103 and is not connected to the patch nut 104.

In the LED driver disclosed in the first embodiment of the present application, in a normal use state, the overvoltage protection ground terminal is connected to the ordinary ground terminal and the conductive housing, and the overvoltage protection circuit is in a working state, as shown in fig. 2. When the LED driver is used for carrying out the voltage withstand test, the conductive screw can be detached from the outside of the conductive shell, namely, the grounding end of the overvoltage protection circuit is disconnected from the ordinary grounding end and the conductive shell, as shown in fig. 3, the voltage withstand test of the driving circuit in the LED driver can be realized without the step of disassembling the conductive shell in the prior art, and the problem of complicated voltage withstand test steps in the prior art is solved.

In a specific application, the conductive housing is connected to the ordinary ground terminal in various ways, for example, two ends of a wire are welded to the conductive housing and the ordinary ground terminal, respectively.

In a specific application, the conductive enclosure may be an aluminum housing, or may be made of any conductive material, and is not limited to the aluminum housing, which may be determined according to a specific application environment.

Example two

Fig. 4 is a schematic structural diagram of an LED driver according to a second embodiment of the present application; a second patch nut 206 is arranged on the circuit board of the driving circuit, the second patch nut 206 is conductive, a common ground terminal is connected to the second patch nut 206, the patch nut 204 and the second patch nut 206 are respectively arranged on the front and back sides of the circuit board 205 of the driving circuit, the casing 201 is provided with a through hole 203 of the conductive screw 202, and the conductive screw 202 passes through the through hole 203 and is connected with the patch nut 204 and the second patch nut 206. The perforation 203 in fig. 4 is covered by the conductive screw 202, not shown.

Another structural schematic diagram of an LED driver provided in the second embodiment of the present application is shown in fig. 5, where the conductive screw 202 does not pass through the through hole 203, the conductive screw 202 is not connected to the patch nut 204, and the conductive screw 202 is not connected to the second patch nut 206.

In the second embodiment of the application, the LED driver is in a normal use state, the patch nut and the second patch nut are connected through the conductive screw, the overvoltage protection ground terminal is connected to the ordinary ground terminal, and the overvoltage protection circuit is in a working state, as shown in fig. 4. When the LED driver is used for carrying out the voltage withstand test, the conductive screw can be detached from the outside of the shell, namely, the connection between the patch nut and the second patch nut is disconnected, as shown in fig. 5, so that the overvoltage protection grounding end and the ordinary grounding end are separated, the voltage withstand test of the driving circuit in the LED driver can be realized without the step of disassembling the shell in the prior art, and the problem that the voltage withstand test step in the prior art is complicated is solved.

In a specific application, a circuit board of the driving circuit is provided with a non-metalized through hole, and the patch nut and the second patch nut are coaxial on the circuit board of the driving circuit and are respectively positioned on the front side and the back side of the non-metalized through hole; the size of the non-metallized through hole can ensure that the conductive screw can pass through, so that the conductive screw can be connected with the patch nut and the second patch nut.

The above description is only the preferred embodiment of the present invention, and it will be understood and appreciated by those skilled in the art that the present invention may be embodied as follows. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An LED driver, comprising: the conductive screw, the shell and the driving circuit are arranged in the shell; the driving circuit comprises an overvoltage protection circuit, the overvoltage protection circuit is provided with an overvoltage protection grounding terminal, the grounding terminal of the driving circuit except the other part of the overvoltage protection circuit is a common grounding terminal, and the overvoltage protection grounding terminal is not connected with the common grounding terminal on a circuit board of the driving circuit; a patch nut is arranged on a circuit board of the driving circuit and is conductive, and the overvoltage protection grounding end is connected to the patch nut.

2. The LED driver of claim 1, wherein the overvoltage protection circuit is a common mode lightning protection circuit.

3. The LED driver as claimed in claim 1, wherein the housing is provided with a through hole, and the input line, the output line and the dimming line of the LED driver pass through the through hole to be connected with the driving circuit arranged in the housing.

4. The LED driver of claim 1, wherein the housing is an electrically conductive housing provided with a through hole for the conductive screw, the conductive screw passing through the through hole and being connected to the patch nut, the electrically conductive housing being connected to the ordinary ground terminal.

5. The LED driver of claim 1, wherein a second patch nut is disposed on the circuit board of the driving circuit, the second patch nut is electrically conductive, the ordinary ground terminal is connected to the second patch nut, the patch nut and the second patch nut are disposed on opposite sides of the circuit board of the driving circuit, the housing is provided with a through hole for the conductive screw, and the conductive screw passes through the through hole and is connected to the patch nut and the second patch nut.