Withstand voltage test circuit of LED lamp

Abstract

The utility model relates to the technical field of electrical engineering, in particular to a withstand voltage test circuit of an LED lamp, which comprises an LED driving power supply and a withstand voltage tester, the withstand voltage tester comprises an LED lamp panel, a three-gear toggle switch, a diode D1 and a diode D2, the LED lamp panel comprises an aluminum substrate, and the aluminum substrate is connected with a ground wire of the withstand voltage tester. After the LED lamp string is installed on the upper surface of the aluminum substrate, when the three-gear toggle switch is toggled to the two sides, the three-gear toggle switch is communicated with the LED-end of the LED driving power supply after passing through the LED lamp string and the diode D1 or the diode D2 from the LED + end of the LED driving power supply, and a loop is formed. The withstand voltage test voltage is transmitted to the aluminum substrate after passing through the LED driving power supply and the LED lamp string, so that the potentials of all circuits are consistent, and the leakage current generated during the withstand voltage test is greatly reduced, thereby helping the LED lamp to reach the withstand voltage test standard of the I-type lamp.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical engineering, and particularly relates to a withstand voltage test circuit for an LED lamp. Background Art

[0002] A lamp generally refers to a device for emitting light, which is composed of a bulb, a lampshade, a lamp holder, etc., and provides illumination or decorative functions. An LED (Light Emitting Diode) lamp refers to a lamp that uses an LED as a light source. It is a semiconductor device that can convert electrical energy into light energy, and has the advantages of high efficiency, energy saving, long service life, etc., and is widely used in the lighting field. Class I lamps refer to a class of lamps that meet specific electrical equipment safety standards and have the characteristic of grounding the outer shell. Such lamps are generally considered safer because the grounding design of their outer shells helps reduce the risk of electric shock and improve the safety performance of the equipment. Being rated as a Class I lamp is very important for lamp manufacturers, as it can not only ensure the safety and compliance of the product, but also enhance the market competitiveness and user satisfaction of the product. Then, lamps generally need to undergo withstand voltage tests, grounding tests, insulation resistance tests, leakage current tests, and lamp performance tests, and meet the requirements of these tests before they can be rated as Class I lamps. Among them, the withstand voltage test of LED lamps is to verify their insulation performance and safety performance to ensure that there are no safety problems such as electric leakage or breakdown under normal use conditions. During the test, a specified high voltage, such as 1.5 KV, is applied to the LED lamp, and at the same time, it is detected whether the LED lamp can withstand this high voltage for a certain period of time without failure. LED lamps that pass the withstand voltage test generally meet relevant international or regional standards, such as IEC 60598, etc. However, currently, during the withstand voltage test of LED lamps as Class I lamps, when the color temperature is adjusted to a single color temperature (such as warm white light or cold white light), due to the large leakage current, the withstand voltage cannot reach the withstand voltage test standard of Class I lamps, and it cannot fully meet the safety regulations certification requirements of Class I lamps. Content of the Utility Model

[0003] In view of this, the utility model provides a withstand voltage test circuit for an LED lamp, aiming to solve the problem that during the withstand voltage test of LED lamps as Class I lamps, when the color temperature is adjusted to a single color temperature, the withstand voltage cannot reach the withstand voltage test standard of Class I lamps due to the large leakage current.

[0004] The present utility model provides a voltage withstand test circuit for an LED lamp, which includes an LED driving power supply and a voltage withstand tester. The voltage withstand tester includes an LED lamp board, a three-position toggle switch, diode D1, and diode D2. The LED lamp board includes an aluminum substrate. The upper surface of the aluminum substrate is provided with mounting positions for LED lamps, and the aluminum substrate is also connected to the ground wire of the voltage withstand tester. The LED+ terminal of the LED driving power supply is connected to the LED+ terminal of the LED lamp board. The D- terminal of the LED lamp board is connected to the D- terminal of the three-position toggle switch. The W- terminal of the LED lamp board is connected to the W- terminal of the three-position toggle switch. The LED- terminal of the three-position toggle switch is connected to the LED- terminal of the LED driving power supply;

[0005] Wherein, the D- terminal of the three-position toggle switch is further connected to the negative electrode of diode D1, the positive electrode of diode D1 is connected to the LED- terminal of the three-position toggle switch, the W- terminal of the three-position toggle switch is further connected to the negative electrode of diode D2, and the positive electrode of diode D2 is connected to the LED- terminal of the three-position toggle switch.

[0006] Furthermore, the LED driving power supply is an LED non-isolated driving power supply.

[0007] Furthermore, the LED non-isolated driving power supply is also connected to the AC-L terminal, AC-N terminal, and AC-E terminal of the AC power supply of the voltage withstand tester.

[0008] Furthermore, a plurality of LED lamp strings are mounted on the upper surface of the aluminum substrate, and all the LED lamp strings are connected in parallel.

[0009] Furthermore, the same number of LED lamps are connected in series on each LED lamp string.

[0010] Furthermore, the aluminum substrate is sequentially provided with a copper foil layer, an insulating layer, and an aluminum base material layer from top to bottom.

[0011] Furthermore, the aluminum substrate is an aluminum substrate with a voltage withstand rating of at least 4 KV.

[0012] Furthermore, both diode D1 and diode D2 are diodes with a voltage withstand rating of at least 1 KV.

[0013] Furthermore, the three-position toggle switch is arranged at the front end of the voltage withstand tester, the LED lamp board is arranged at the rear end of the voltage withstand tester, and a waterproof structure is arranged between the three-position toggle switch and the LED lamp board.

[0014] Furthermore, the waterproof structure is an O-ring.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: A voltage withstand test circuit for an LED lamp includes an LED driving power supply and a voltage withstand tester. The voltage withstand tester includes an LED lamp board, a three-position toggle switch, diode D1, and diode D2. The LED lamp board includes an aluminum substrate. The upper surface of the aluminum substrate is provided with an installation position for the LED lamp. The aluminum substrate is also connected to the ground wire of the voltage withstand tester. The LED+ terminal of the LED driving power supply is connected to the LED+ terminal of the LED lamp board. The D- terminal of the LED lamp board is connected to the D- terminal of the three-position toggle switch. The W- terminal of the LED lamp board is connected to the W- terminal of the three-position toggle switch. The LED- terminal of the three-position toggle switch is connected to the LED- terminal of the LED driving power supply. Among them, the D- terminal of the three-position toggle switch is also connected to the negative electrode of diode D1, the positive electrode of diode D1 is connected to the LED- terminal of the three-position toggle switch, the W- terminal of the three-position toggle switch is also connected to the negative electrode of diode D2, and the positive electrode of diode D2 is connected to the LED- terminal of the three-position toggle switch. In this voltage withstand test circuit for the LED lamp, after installing an LED lamp string on the upper surface of the aluminum substrate, when the three-position toggle switch is toggled to the two side positions, the single-color temperature voltage withstand test mode is started. Starting from the LED+ terminal of the LED driving power supply, it passes through the LED lamp string and diode D1 or diode D2 and then is connected to the LED- terminal of the LED driving power supply to form a loop. When performing the voltage withstand test, the voltage withstand test voltage generated by the voltage withstand tester is transmitted to the LED lamp board through the LED driving power supply and the LED lamp string. And the aluminum substrate included in the LED lamp board is connected to the ground wire of the voltage withstand tester. Then the potential of all the lines is the same, and the leakage current generated during the voltage withstand test will be greatly reduced, thereby helping the LED lamp to meet the voltage withstand test standard of Class I lamps and fully meeting the requirements of Class I lamp safety certification. This voltage withstand test circuit has stable and reliable performance and strong feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0017] Figure 1 It is a circuit diagram showing the connection of the three-position toggle switch and diodes D1 and D2 provided by an embodiment of the present utility model;

[0018] Figure 2 It is a functional pin diagram of the three-position toggle switch provided by an embodiment of the present utility model;

[0019] Figure 3The circuit diagram of the LED lamp board provided by the embodiment of the present utility model;

[0020] Figure 4 The circuit diagram of the non-isolated LED driving power supply provided by the embodiment of the present utility model. Specific embodiments

[0021] Next, the solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0024] Please refer to Figures 1-4 As shown, the present utility model provides a withstand voltage test circuit for an LED lamp, including an LED driving power supply and a withstand voltage tester. The withstand voltage tester includes an LED lamp board, a three-position toggle switch, diode D1, and diode D2. The LED lamp board includes an aluminum substrate. The upper surface of the aluminum substrate is provided with an installation position for the LED lamp. The aluminum substrate is also connected to the ground wire of the withstand voltage tester. The LED+ terminal of the LED driving power supply is connected to the LED+ terminal of the LED lamp board. The D- terminal of the LED lamp board is connected to the D- terminal of the three-position toggle switch. The W- terminal of the LED lamp board is connected to the W- terminal of the three-position toggle switch. The LED- terminal of the three-position toggle switch is connected to the LED- terminal of the LED driving power supply;

[0025] Among them, the D- terminal of the three-gear toggle switch is also connected to the negative electrode of the diode D1, the positive electrode of the diode D1 is connected to the LED- terminal of the three-gear toggle switch, the W- terminal of the three-gear toggle switch is also connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to the LED- terminal of the three-gear toggle switch.

[0026] Specifically, a voltage withstand tester usually comes with a three-gear toggle switch for selecting different test gears. The color temperature of LED lights is generally divided into three types: warm color, neutral color, and cold color, corresponding to different spectral characteristics and color performances respectively. When the three-gear toggle switch is toggled to the two side positions, the LED lights will show the color temperature of warm color or cold color. The warm color usually appears as yellow or orange, and the cold color usually appears as blue or white. The warm-color LED lights are suitable for home lighting or decorative lighting, while the cold-color LED lights are suitable for offices or commercial places. When the three-gear toggle switch is toggled to the middle position, the LED lights will show the color temperature of neutral color, which is between the warm color and the cold color, and usually appears as natural white light or white light. This color temperature is considered to be relatively close to the color temperature of natural light and is suitable for general lighting environments. It can be seen that the middle gear of the three-gear toggle switch can combine the two extreme color temperatures of the LED lights, and the two side gears of the three-gear toggle switch can make the LED lights present a single color temperature, thereby realizing the switching of warm white light, neutral white light, and cold white light of the LED lamp.

[0027] Compared with the prior art, in the voltage withstand test circuit of the LED lamp proposed in this embodiment, after installing the LED lamp string on the upper surface of the aluminum substrate, when the three-gear toggle switch is toggled to the two side positions, the single-color-temperature voltage withstand test mode is started. Starting from the LED+ terminal of the LED driving power supply, it passes through the LED lamp string and the diode D1 or diode D2 and then is connected to the LED- terminal of the LED driving power supply to form a loop. When performing the voltage withstand test, the voltage withstand test voltage generated by the voltage withstand tester is transmitted to the LED lamp board through the LED driving power supply and the LED lamp string, and the aluminum substrate included in the LED lamp board is connected to the ground wire of the voltage withstand tester. Then the potential of all the lines is the same, and the leakage current generated during the voltage withstand test will be greatly reduced, thereby helping the LED lamp to meet the voltage withstand test standard of Class I lamps and fully comply with the safety regulations certification requirements of Class I lamps. This voltage withstand test circuit has stable and reliable performance and strong feasibility.

[0028] In some embodiments of the present application, the LED driving power supply is an LED non-isolated driving power supply.

[0029] Specifically, the LED non-isolated driving power supply is a design scheme of an LED driving power supply. It directly connects the LED to the AC power supply without using an isolation transformer to isolate the input and output. This design usually adopts a simplified circuit structure and has a lower cost.

[0030] In some embodiments of the present application, the LED non-isolated drive power supply is also connected to the AC-L terminal, AC-N terminal, and AC-E terminal of the AC power supply of the withstand voltage tester.

[0031] Specifically, the AC-L terminal is the line terminal of the AC power supply, providing the positive voltage of the power supply. The LED non-isolated drive power supply is connected to the AC-L terminal to obtain the positive voltage signal of the input power supply, so as to work normally and drive the LED. The AC-N terminal is the line terminal of the AC power supply, providing the zero voltage of the power supply. The LED non-isolated drive power supply is connected to the AC-N terminal to obtain the zero voltage signal of the input power supply, serving as the reference point of the circuit to ensure the normal operation of the circuit. The AC-E terminal is the line terminal of the AC power supply, usually representing "ground wire", which is used for grounding protection and safety. By connecting the LED non-isolated drive power supply to the AC-L terminal, AC-N terminal, and AC-E terminal of the AC power supply of the withstand voltage tester, it can be ensured that the LED drive power supply can receive stable AC power supply normally, and the safety and stability of the device are guaranteed. This connection method complies with the electrical safety standards and requirements, and is the basis for the normal operation of the LED non-isolated drive power supply.

[0032] In some embodiments of the present application, a plurality of LED lamp strings are mounted on the upper surface of the aluminum substrate, and all the LED lamp strings are connected in parallel.

[0033] Specifically, connecting the LED lamp strings in parallel can ensure that each LED lamp string receives the same voltage, thereby ensuring the uniform brightness between the LED lamp strings, avoiding the situation of uneven brightness, and further affecting the accuracy of the withstand voltage test results.

[0034] In some embodiments of the present application, the same number of the LEDs are connected in series on each of the LED lamp strings.

[0035] Specifically, the number of LEDs connected in series on each LED lamp string can be adjusted according to the actual test requirements to flexibly cope with different test scenarios.

[0036] In some embodiments of the present application, a copper foil layer, an insulating layer, and an aluminum base material layer are sequentially arranged on the aluminum substrate from top to bottom.

[0037] Specifically, the copper foil layer is used to install LED lights. It has good electrical conductivity and heat dissipation performance, can effectively conduct current and dissipate heat, and at the same time provides installation support for the LED lights. The insulating layer is used to isolate the copper foil layer and the aluminum substrate material layer to prevent short circuits or electrical contacts between them. The insulating layer is usually made of insulating materials such as resin and fiberglass, has good insulation performance, and can ensure the safe and stable operation of the circuit. The aluminum substrate material layer is the base material of the entire aluminum substrate, and has good heat dissipation performance and mechanical strength. The aluminum substrate material layer can effectively dissipate heat, reduce the working temperature of the LED lights, and extend the service life of the LED lights.

[0038] In some embodiments of the present application, the aluminum substrate is an aluminum substrate with a withstand voltage level of at least 4 KV.

[0039] Specifically, an aluminum substrate with a withstand voltage level of at least 4 KV usually refers to a high-voltage aluminum substrate. This kind of aluminum substrate has high insulation performance and withstand voltage ability, can withstand higher voltages, and is usually applied to electronic devices and circuits that require a higher withstand voltage level.

[0040] In some embodiments of the present application, both the diode D1 and the diode D2 are diodes with a withstand voltage level of at least 1 KV.

[0041] Specifically, a diode with a withstand voltage level of at least 1 KV usually refers to a high-voltage diode, also known as a high-voltage rectifier diode. This kind of diode has high withstand voltage ability and can withstand higher reverse voltages. It is usually applied to electronic devices and circuits that require a high withstand voltage level. High-voltage diodes are widely used in fields such as power supply, rectifier, and inverter to meet the rectification and protection requirements in high-voltage environments. When the diode is reverse-biased, it usually behaves as an open circuit, blocking the current from passing through. However, in actual situations, due to the structural characteristics of the diode and the influence of external conditions, there may be a small amount of reverse leakage current. This reverse leakage current is usually very small and can be ignored.

[0042] In some embodiments of the present application, the three-position toggle switch is arranged at the front end of the withstand voltage tester, the LED light board is arranged at the rear end of the withstand voltage tester, and a waterproof structure is arranged between the three-position toggle switch and the LED light board.

[0043] Specifically, arranging a waterproof structure between the three-position toggle switch and the LED light board can prevent moisture or humidity from entering the interior of the withstand voltage tester, protect the circuit of the withstand voltage tester, reduce the risk of circuit board corrosion and component damage, thereby extending the life of the withstand voltage tester and reducing the maintenance and replacement costs.

[0044] In some embodiments of the present application, the waterproof structure is an O-ring.

[0045] Specifically, the three - position toggle switch is usually circular in design, matching the circular cross - section of the O - ring. After the three - position toggle switch and the O - ring are sleeved, the O - ring can provide uniform sealing pressure around the three - position toggle switch, effectively preventing the intrusion of moisture and dampness and providing a more complete sealing effect. In addition, the circular fit between the three - position toggle switch and the O - ring can reduce the possibility of loosening and displacement, maintaining the stability of the sealing effect.

[0046] Specifically, when performing the withstand voltage test on Class I lamps, an LED lamp string is installed on the upper surface of the aluminum substrate. The AC - L terminal and the AC - N terminal of the LED driver in the LED lamp are short - circuited, and the LED driver is connected to the positive wire of the withstand voltage tester for testing. The AC - E terminal of the LED driver is connected to the ground wire of the withstand voltage tester, and the aluminum substrate included in the LED lamp board is connected to the AC - E terminal.

[0047] When the three - position toggle switch (also called the color temperature toggle switch) is toggled to the middle position, the mixed color temperature withstand voltage test mode is started. The 1.5 KV withstand voltage generated by the withstand voltage tester is directly transmitted through the LED non - isolated drive power supply to between the LED lamp board and the AC - E terminal, and the intermediate insulating medium is the aluminum substrate.

[0048] When the three - position toggle switch (also called the color temperature toggle switch) is toggled to both side positions, the single color temperature withstand voltage test mode is started, so that the LED non - isolated drive power supply outputs LED +, which passes through the LED lamp string and diode D1 or diode D2 and then is connected to the LED - of the LED drive power supply to form a loop. The 1.5 KV withstand voltage generated by the withstand voltage tester is transmitted to the LED lamp board through the LED non - isolated drive power supply. The aluminum substrate included in the LED lamp board is connected to the ground wire of the withstand voltage tester. Then the potential of all the circuits is the same, which can greatly reduce the leakage current when the Class I lamp is subjected to the withstand voltage test, so that the LED lamp meets the withstand voltage test standard of Class I lamps. And during the actual use of LED lamps, the damage caused by surges to the LED lamp board will also be minimized. If the aluminum substrate included in the LED lamp board is not connected to the ground wire of the withstand voltage tester, then the 1.5 KV withstand voltage generated by the withstand voltage tester passes through the LED non - isolated drive power supply, through the LED lamp string and diode D1 or diode D2 and reaches between the LED lamp board and the AC - E terminal, and the circuit is completely connected. However, the 1.5 KV withstand voltage generated by the withstand voltage tester passes through the LED non - isolated drive power supply and through the LED lamp string and cannot be completely connected to the LED - of the LED non - isolated drive power supply. Therefore, the line potential of the group of LED lamp strings on the LED lamp board that is not connected to the three - position toggle switch will be lower than the line potential of the group of LED lamp strings that is connected to the three - position toggle switch. The group of LED lamp strings that is connected to the three - position toggle switch will arc - discharge to the group of LED lamp strings that is not connected to the three - position toggle switch, resulting in an increase in leakage current and even exceeding the standard requirement range.

[0049] The withstand voltage test circuit of the LED lamp provided by the embodiment of the present utility model can fully meet the requirements of the safety regulations certification for Class I lamps with a withstand voltage of 100% when the color temperature is adjusted to a single color temperature during the withstand voltage test of the LED lamp as a Class I lamp. The performance is stable and reliable, and the feasibility is strong.

[0050] It should be noted that the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0051] The above are only partial or preferred embodiments of the present utility model. Whether in terms of text or drawings, the scope of protection of the present utility model cannot be limited thereby. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the overall concept of the present utility model, or any direct / indirect application in other related technical fields is included in the scope of protection of the present utility model.

Claims

1. A withstand voltage test circuit for LED lamps, characterized in that: It comprises an LED driving power supply and a withstand voltage tester, wherein the withstand voltage tester comprises an LED light board, a three-speed toggle switch, a diode D1 and a diode D2, wherein the LED light board comprises an aluminum substrate, an upper surface of which is provided with a mounting position for an LED light, and the aluminum substrate is also connected to a ground wire of the withstand voltage tester, an LED+ end of the LED driving power supply is connected to an LED+ end of the LED light board, a D- end of the LED light board is connected to a D- end of the three-speed toggle switch, a W- end of the LED light board is connected to a W- end of the three-speed toggle switch, and an LED- end of the three-speed toggle switch is connected to an LED- end of the LED driving power supply; Among them, the D-end of the three-speed toggle switch is also connected to the cathode of the diode D1, the anode of the diode D1 is connected to the LED-end of the three-speed toggle switch, the W-end of the three-speed toggle switch is also connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the LED-end of the three-speed toggle switch.

2. The withstand voltage test circuit of the LED lamp according to claim 1, characterized in that: The LED driving power supply is a non-isolated LED driving power supply.

3. The withstand voltage test circuit of the LED lamp according to claim 2, characterized in that: The LED non-isolated driving power supply is also connected to the AC-L terminal, AC-N terminal and AC-E terminal of the AC power supply of the withstand voltage tester.

4. The withstand voltage test circuit of the LED lamp according to claim 1, characterized in that: A plurality of LED light strings are installed on the upper surface of the aluminum substrate, and all of the LED light strings are connected in parallel.

5. The withstand voltage test circuit of the LED lamp according to claim 4, characterized in that: Each LED light string is connected in series with the same number of LED lights.

6. The withstand voltage test circuit of the LED lamp according to claim 1, characterized in that: The aluminum substrate is provided with a copper foil layer, an insulating layer and an aluminum-based material layer in sequence from top to bottom.

7. The withstand voltage test circuit of the LED lamp according to claim 1, characterized in that: The aluminum substrate has a withstand voltage rating of at least 4KV.

8. The withstand voltage test circuit of the LED lamp according to claim 1, characterized in that: The diode D1 and the diode D2 are both diodes with a withstand voltage rating of at least 1 KV.

9. The withstand voltage test circuit of the LED lamp according to claim 1, characterized in that: The three-position toggle switch is arranged at the front end of the withstand voltage tester, the LED light board is arranged at the rear end of the withstand voltage tester, and a waterproof structure is arranged between the three-position toggle switch and the LED light board.

10. The withstand voltage test circuit of the LED lamp according to claim 9, characterized in that: The waterproof structure is an O-type rubber ring.

Images