CN211509382U

CN211509382U - LED lamp protection circuit and LED lamp

Info

Publication number: CN211509382U
Application number: CN202020045743.1U
Authority: CN
Inventors: 周家明; 甘彩英; 蒲纪忠
Original assignee: CH Lighting Technology Co Ltd
Current assignee: CH Lighting Technology Co Ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-09-15
Anticipated expiration: 2030-01-09

Abstract

The application discloses LED lamp protection circuit and LED lamp, including voltage input end, rectifier, warning resistance, insurance unit and be used for connecting LED emitting diode's load end, wherein: the voltage input end is used for inputting alternating voltage; the alternating current side of the rectifier is connected with the voltage input end, and the direct current side of the rectifier is connected with the load end; the warning resistor is connected to the direct current side or the alternating current side of the rectifier; the safety unit is connected to the alternating current side or the direct current side of the rectifier and is thermally coupled with the warning resistor; the alarm resistor generates heat when the voltage at the two ends exceeds the rated voltage, so that the safety unit is fused to cut off the alternating current side loop. Above-mentioned LED lamp protection circuit and LED lamp through connect adjacent warning resistance and insurance unit at rectifier both ends, and when the circuit was excessive pressure, the resistance that warns generated heat, makes insurance unit open a way, cuts off the return circuit to avoid electronic component to damage, it is safer.

Description

LED lamp protection circuit and LED lamp

Technical Field

The application relates to the technical field of lighting, in particular to an LED lamp protection circuit and an LED lamp.

Background

LED lighting technology is rapidly developing and gradually replacing conventional incandescent and fluorescent lamps. The LED lamp tube has the advantages of low energy consumption, environmental protection, long service life and the like.

There are two schemes for replacing the existing fluorescent lamp with an LED lamp: firstly, a lamp is not reformed, and is directly replaced, namely, a fluorescent lamp is directly taken down and replaced by an LED lamp tube; the second is to bypass the ballast by trimming, and realize single-end or double-end power feeding by wiring. There are 3 kinds of LED lamp tube products on the market at present: TYPE A alternate TYPE, TYPE B cut-line TYPE and TYPE A + B compatible TYPE.

Commercially available electronic ballasts can be mainly classified into an Instant Start (Instant Start) electronic ballast and a warm Start (Program Start) electronic ballast. The electronic ballast is provided with a resonant circuit, the driving design of the resonant circuit is matched with the load characteristic of the fluorescent lamp, and when the electronic ballast is started, high-frequency high voltage is output, namely the electronic ballast is a capacitive component before the fluorescent lamp is lighted, and is a resistive component (constant voltage and constant current) after the fluorescent lamp is lighted, and a corresponding starting program is provided, so that the fluorescent lamp can be correctly lighted. The LED lamp is a nonlinear component, and the characteristics of the LED lamp are completely different from those of a fluorescent lamp. The electronic ballast is equivalent to a current source, and when the electronic ballast is used as a power supply of the LED lamp, overcurrent, overvoltage or undercurrent, undervoltage are easily caused, so that electronic components are damaged or the LED lamp cannot stably provide illumination.

Disclosure of Invention

The utility model provides a LED lamp protection circuit and LED lamp, through connect adjacent warning resistance and insurance unit at rectifier both ends, when the circuit is excessive pressure, the resistance of warning generates heat, makes insurance unit fusing cuts off the return circuit to avoid electronic component to damage, it is safer to lead to the electronic ballast equivalence to be the electric current source, when the power as the LED lamp, causes easily that it is excessive pressure or the undercurrent is undervoltage, leads to electronic component to damage or LED straight tube lamp can't stably provide the problem of illumination.

The application provides a LED lamp protection circuit, including voltage input end, rectifier, warning resistance, insurance unit and be used for connecting LED emitting diode's load end, wherein:

the voltage input end is used for inputting alternating voltage;

the alternating current side of the rectifier is connected with the voltage input end, and the direct current side of the rectifier is connected with the load end;

the warning resistor is connected to the direct current side or the alternating current side of the rectifier;

the safety unit is connected to the alternating current side or the direct current side of the rectifier and is thermally coupled with the warning resistor;

the alarm resistor generates heat when the voltage at two ends exceeds the rated voltage, so that the safety unit is fused to cut off the alternating current side loop.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the warning resistor comprises a voltage dependent resistor, and the normal operating voltage of the voltage dependent resistor is 300V-600V.

Optionally, the fuse unit includes a fuse, and a fusing temperature of the fuse is 160 ℃.

Optionally, the direct current side of rectifier includes positive terminal and negative pole end, the arrangement mode of warning resistance in the direct current side for the warning resistance both ends respectively with positive terminal and negative pole end link to each other, or the direct current side is parallelly connected has a filter capacitor, the resistance that warns is parallelly connected behind the filter capacitor, the arrangement mode of warning resistance in the interchange side links to each other with interchange side both ends respectively for warning resistance both ends.

Optionally, the arrangement of the safety units on the ac side is that the safety units are connected in series in an ac side loop of the rectifier, and the arrangement of the safety units on the dc side is that the safety units are connected to the positive terminal or the negative terminal.

Optionally, the safety unit directly contacts with the warning resistor, and one side of the safety unit opposite to the warning resistor is a heat exchange surface, and the heat exchange surfaces of the safety unit and the warning resistor are attached to each other.

Optionally, the safety unit is indirectly in contact with the alarm resistor through a heat conducting element.

Optionally, the heat conducting element is a heat conducting silica gel layer coated between the safety unit and the warning resistor.

Optionally, the heat conducting element is a metal piece, one side of the safety unit opposite to the alarm resistor is a heat exchange surface, and the metal piece is respectively attached to the heat exchange surfaces of the safety unit and the alarm resistor.

The application provides an LED lamp, including above-mentioned LED lamp protection circuit and LED emitting diode, LED emitting diode with LED lamp protection circuit's load end links to each other.

Above-mentioned LED lamp protection circuit and LED lamp through connect adjacent warning resistance and insurance unit at rectifier both ends, and when the circuit was excessive pressure, the resistance that warns generated heat, makes insurance unit fusing cuts off the return circuit to avoid electronic component to damage, it is safer.

Drawings

Fig. 1 is a schematic circuit diagram of an LED lamp according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

An embodiment of the present application provides a LED lamp protection circuit, and LED lamp protection circuit includes voltage input end, rectifier 1, warning resistance R1, insurance unit F1 and is used for connecting the load end of LED lamp, wherein:

the voltage input end is used for inputting alternating voltage;

the alternating current side of the rectifier 1 is connected with the voltage input end, and the direct current side is connected with the load end, and is used for rectifying the input alternating current voltage into direct current voltage and outputting the direct current voltage to the load end;

the warning resistor R1 is connected to the DC side or AC side of the rectifier 1;

the fuse unit F1 is connected to the AC side or DC side of the rectifier 1 and is thermally coupled to the alarm resistor R1;

when the voltage across both ends exceeds the rated voltage, the alarm resistor R1 generates heat, and the fuse unit F1 fuses to cut off the ac side circuit.

Above-mentioned LED lamp protection circuit through connect adjacent warning resistance R1 and insurance unit F1 at rectifier 1 both ends, and when the circuit was excessive pressure, warning resistance R1 generated heat, made insurance unit F1 fusing, cut off the return circuit to avoid electronic component to damage, it is safer.

In another embodiment, the warning resistor R1 comprises a voltage dependent resistor, and the normal operating voltage of the voltage dependent resistor is 300V-600V. It can be understood that the variation of the heat generation and temperature of the varistor with voltage is more severe, that is, when the voltage is too large, the varistor can generate a large amount of heat and reach a higher temperature. Specifically, in other embodiments, the alarm resistor R1 may be another type of resistor, which only generates a large amount of heat and reaches a certain temperature when the voltage is too high.

In another embodiment, the fuse unit F1 includes a fuse having a melting temperature of 160 ℃. It can be understood that the fuse is adjacent to the alarm resistor R1, and when the alarm resistor R1 generates a large amount of heat and reaches a certain temperature, the fuse is blown, and the circuit is cut off and protected. Specifically, in other embodiments, the fuse unit F1 may be implemented by other devices, and only needs to be able to open to cut off the loop when the alarm resistor R1 generates heat.

In another embodiment, the dc side of the rectifier 1 includes a positive terminal V + and a negative terminal V-, the positive terminal V + is connected to a filter inductor L1, the dc side is connected in parallel to a filter capacitor C1, and the filter inductor L1 and the filter capacitor L1 form a filter unit to filter the output voltage of the dc side.

It is understood that the alarm resistor R1 may be disposed at the a position, the B position, or the C position. Specifically, the arrangement mode of the warning resistor R1 on the direct current side is the position a, the two ends of the warning resistor R1 are respectively connected with the positive terminal V + and the negative terminal V-, or the position B, the warning resistor R1 is connected in parallel behind the filter capacitor C1, the arrangement mode of the warning resistor R1 on the alternating current side is the position C, and the two ends of the warning resistor R1 are respectively connected with the two ends of the alternating current side.

It is understood that the safety unit F1 can be disposed at the D position, the E position, or the F position. Specifically, the fuse unit F1 is arranged at the D position on the ac side, the fuse unit F1 is connected in series in the ac side loop of the rectifier, the fuse unit F1 is arranged at the E position on the dc side, and the fuse unit F1 is connected to the positive terminal V +, or the fuse unit F1 is connected to the negative terminal V-.

In other embodiments, the arrangement positions of the alarm resistor R1 and the safety unit F1 can be combined arbitrarily to form different circuits, and the effect of ensuring the safety of the circuits can be achieved.

In another embodiment, the safety unit F1 directly contacts the alarm resistor R1, and the opposite sides of the safety unit F1 and the alarm resistor R1 are heat exchange surfaces, and the heat exchange surfaces are attached to each other. It can be understood that the fuse unit F1 and the alarm resistor R1 are not adjacent to each other in the circuit structure, but are adjacent to each other in the space relationship, so that when the alarm resistor R1 generates heat, the heat can be transferred to the fuse unit F1, and the fuse unit F1 is blown. Specifically, the heat generated by the alarm resistor R1 is transferred to the safety unit F1 through the heat exchange surface attached to the safety unit F1, so that the safety unit F1 is fused.

In another embodiment, the fuse unit F1 is in indirect contact with the alarm resistor R1 via a heat conducting element. It is understood that the heat generated by the alarm resistor R1 can be transferred to the fuse unit F1 through the heat conducting element.

In another embodiment, the heat conducting element is a heat conducting silica gel layer coated between the fuse unit F1 and the alarm resistor R1. It will be appreciated that the thermally conductive element may comprise a device of other materials, merely providing a thermally conductive effect.

In another embodiment, the heat conducting element is a metal member, the opposite sides of the safety unit F1 and the warning resistor R1 are heat exchanging surfaces, and the metal member is respectively attached to the heat exchanging surfaces of the safety unit F1 and the warning resistor R1.

An embodiment of the application provides an LED lamp, including above-mentioned LED lamp protection circuit and LED emitting diode, LED emitting diode links to each other with LED lamp protection circuit's load end. It can be understood that the rectifier 1 rectifies the input voltage, and transmits the rectified dc voltage to the LED through the load end to supply power to the LED, and if the LED lamp protection circuit is open, no voltage passes through the two ends of the LED, thereby playing a role in protection. Specifically, the LED light emitting diodes include a first LED1 and a second LED2, and in other embodiments, the LED light emitting diodes may include a plurality of LEDs, and the number of the LEDs may be set according to actual situations.

It can be understood that X1, X2, X3 and X4 in the figure are 4 pins of the existing fluorescent lamp, and the LED lamp is connected to the 4 pins by replacing, trimming or replacing the trimming compatible mode to connect to the lighting circuit to replace the fluorescent lamp. Specifically, pins X1, X2 are connected to the voltage input terminal, and pins X3, X4 are connected to the load terminal.

In another embodiment, the LED lamp further includes a fuse F2, where one end of the fuse F2 is connected to the fuse unit F1, and the other end is connected to pins X3 and X4, and is used to fuse when the circuit is over-voltage and the fuse unit F1 fails, so as to open the circuit, and thus, the circuit is protected.

Above-mentioned LED lamp protection circuit and LED lamp through connect adjacent warning resistance and insurance unit at rectifier both ends, and when the circuit was excessive pressure, the resistance that warns generated heat, makes insurance unit open a way, cuts off the return circuit to avoid electronic component to damage, it is safer.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

LED lamp protection circuit, its characterized in that includes voltage input end, rectifier, warning resistance, insurance unit and is used for connecting the load end of LED emitting diode, wherein:

the voltage input end is used for inputting alternating voltage;

the alternating current side of the rectifier is connected with the voltage input end, and the direct current side of the rectifier is connected with the load end;

the warning resistor is connected to the direct current side or the alternating current side of the rectifier;

the safety unit is connected to the alternating current side or the direct current side of the rectifier and is thermally coupled with the warning resistor;

the alarm resistor generates heat when the voltage at two ends exceeds the rated voltage, so that the safety unit is fused to cut off the alternating current side loop.
2. The LED lamp protection circuit of claim 1, wherein the warning resistor comprises a voltage dependent resistor, and the voltage dependent resistor normally operates at a voltage of 300V-600V.
3. The LED lamp protection circuit of claim 1, wherein the fuse unit comprises a fuse having a fusing temperature of 160 ℃.
4. The LED lamp protection circuit according to claim 1, wherein the DC side of the rectifier includes a positive terminal and a negative terminal, the arrangement of the alarm resistor on the DC side is that the two terminals of the alarm resistor are respectively connected to the positive terminal and the negative terminal, or the DC side is connected in parallel with a filter capacitor, the alarm resistor is connected in parallel behind the filter capacitor, and the arrangement of the alarm resistor on the AC side is that the two terminals of the alarm resistor are respectively connected to the two terminals of the AC side.
5. The LED lamp protection circuit according to claim 4, wherein the fuse unit is arranged on the AC side in such a manner that the fuse unit is connected in series in the AC side loop of the rectifier, and the fuse unit is arranged on the DC side in such a manner that the fuse unit is connected with the positive terminal or the negative terminal.
6. The LED lamp protection circuit of claim 1, wherein the fuse unit is in direct contact with the alarm resistor, and a heat exchange surface is formed on a side of the fuse unit opposite to the alarm resistor, and the heat exchange surfaces of the fuse unit and the alarm resistor are attached to each other.
7. The LED lamp protection circuit of claim 1, wherein the safety unit is in indirect contact with the alarm resistor through a thermally conductive element.
8. The LED lamp protection circuit of claim 7, wherein the heat conducting element is a heat conducting silicone layer coated between the fuse unit and the alarm resistor.
9. The LED lamp protection circuit of claim 7, wherein the heat conducting element is a metal member, and a side of the safety unit opposite to the alarm resistor is a heat exchange surface, and the metal member is respectively attached to the heat exchange surfaces of the safety unit and the alarm resistor.
10. An LED lamp, comprising the LED lamp protection circuit of any one of claims 1 to 9 and an LED light-emitting diode, wherein the LED light-emitting diode is connected to a load terminal of the LED lamp protection circuit.