CN114205964A

CN114205964A - Linear silicon controlled rectifier dimming lamp and driving method thereof

Info

Publication number: CN114205964A
Application number: CN202010907820.4A
Authority: CN
Inventors: 武良举; 梁锦源; 冯文钦; 何锦荣
Original assignee: Vertex Lighting and Electrical Co Ltd
Current assignee: Vertex Lighting and Electrical Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2022-03-18

Abstract

The invention provides a linear silicon controlled dimming lamp, which comprises: a rectifying unit for accessing an external power supply to obtain electric energy; the input end of the dimming control unit is connected to the rectifying unit so as to control the obtained rectified electric energy; the dimming control unit is connected with the input end and the output end in a manner of simultaneously performing overvoltage protection, wherein the dimming control unit linearly and constantly drives the luminous load at the rear end according to the input end so that the luminous load is supplied with energy without fluctuation.

Description

Linear silicon controlled rectifier dimming lamp and driving method thereof

Technical Field

The invention relates to the technical field of LED lamps and driving control, in particular to a linear silicon controlled dimming lamp and a driving method thereof.

Background

The LED lamp mainly comprises a lamp panel consisting of a plurality of groups of LEDs and a driving part matched with the lamp panel. At present, most of LED lamps are driven by a switching power supply, and especially mainly include a flyback switching power supply, which mainly includes a rectifier circuit, a power stage circuit, and a control circuit. These power stage circuits mainly include a switching tube, such as a triode. The control circuit is used for controlling the on-off of a main power switch tube in the power level circuit, so that the constant current driving of the LED is realized. In addition, the power stage circuit of the flyback switching power supply comprises a transformer composed of an original secondary side besides a switching tube, the space occupied by the transformer is large in volume, the transformer is not easy to design and arrange, and the device of the power stage circuit is high in cost and not easy to market.

As another prior art using linear constant current driving, as shown in fig. 1, a driving portion of an LED lamp includes: the LED dimming circuit comprises a rectifying circuit A, a dimming circuit B, a linear constant current circuit C and a load LED group, wherein the silicon controlled rectifier dimming circuit B and the linear constant current circuit C independently form two different functional module circuits. That is, the rectifying circuit a is connected to an electric energy input, such as an ac mains, and then passes through the dimming circuit B and/or the linear constant current circuit C, and so on, thereby realizing that the load LED group is driven by a constant current to emit light. Moreover, the silicon controlled rectifier dimming circuit B and the linear constant current circuit C are not easily interfered by signals in respective independent work, so that dimming compatibility and smoothness are ensured, and good linear adjustment rate of the silicon controlled rectifier dimming circuit B and the linear constant current circuit C can be ensured in a wider input voltage range. That is, the switching tube is controlled to work in a linear region, and the output current is regulated to keep the average output current constant.

Although the prior art can meet the requirement of functional stability to a certain extent, 1-2 linear constant current chips are additionally required for realizing a hardware structure, and the corresponding power switching tube and other components on the local circuit consume electric energy to a certain extent, so that the electric energy conversion efficiency and the power factor are reduced. Or the compatibility and smoothness of silicon controlled rectifier dimming can be sacrificed while higher conversion efficiency and high power factor are realized, so that the bad phenomenon that the light of the load LED group flickers in the dimming process is caused. Moreover, if additional functions are to be implemented, such as strobe removal, low ripple, overvoltage protection, surge protection, etc., corresponding circuit units, such as a strobe-removing current-stabilizing circuit D, a filter unit circuit, a surge overvoltage protection circuit E, etc., are additionally added on the basis of the above design. On the whole, one aspect is that the whole is easy to consider incompletely, and the other aspect is that the design increases the manufacturing cost of the whole circuit undoubtedly.

As shown in fig. 2 of another prior art, a driving portion of an LED lamp mainly includes a rectifying circuit, a high-voltage linear constant-current dimming circuit, a filter circuit, a surge overvoltage protection circuit, a stroboscopic-removing control circuit, and a load LED group. In the existing design, the high-voltage linear constant-current dimming control unit is a high-voltage linear dimming functional module composed of an IC chip and a sub-circuit thereof, which can not only ensure dimming compatibility and smoothness, but also ensure good linear adjustment rate in a wider input voltage range. Meanwhile, compared with the technology shown in the figure 1, the technology is simpler, and the number of used components is reduced to a certain extent, so that the manufacturing cost is reduced to a certain extent.

However, the prior art, although using high-voltage linear control, has the following unavoidable disadvantages, or cannot better overcome several common performance deficiencies: the input voltage range is narrow; the power conversion efficiency is low; the difference in linearity adjustment; poor dimming compatibility; low power factor, etc. It is worth mentioning that the linear regulation rate and the power conversion efficiency are very important performance indexes. Therefore, it is very necessary to improve the linear adjustment rate and the conversion efficiency of the output of the driving part of the LED lamp.

In addition, for the high voltage linear power supply of the LED lamp, since the size of the power supply needs to be considered, it is usually necessary to use an SMD chip type varistor element to counter the surge during switching the power supply. As will be understood by those skilled in the art, surge herein refers to transient overvoltage exceeding the normal operating voltage. In essence, a surge is a sharp pulse that occurs in only a few millionths of a second. Moreover, for special grid environments, such as the powering of residents in some developing countries, occasionally large voltage fluctuations occur. The alternating current in extreme cases may even reach AC300V, which is a very unfavorable condition for a light-on use or the like. Conventionally, the varistor element of the largest parameter specification can only resist the surge voltage within 2000V at most.

However, the prior art employs a more common conventional design approach. A varistor element functioning as surge protection is provided after a rectifier circuit at the front end portion of a power supply input terminal and a varistor (M1) is provided before a high-voltage linear constant-current dimming circuit at a main circuit portion, that is, a varistor (M1) is generally provided in parallel with both output terminals of a bridge stack (BD). Therefore, the voltage dependent resistor (M1) can only resist the surge high voltage within 2000V, but cannot resist the application occasions needing the protection of the surge high voltage of 2500V or more. For the application fields needing to resist the higher surge voltage of 2500V or above, the circuit which only relies on a single element as the surge overvoltage protection module cannot meet the functional condition. Under conventional thinking, two or more piezoresistors (M1) are required to be arranged for achieving the aim, or a suppression diode element with larger volume capacity is used, or a plurality of capacitors are connected in parallel, and the like. However, in any of these methods, the circuit design size is necessarily increased, the original size advantage is lost, and the cost of components is additionally increased. Meanwhile, because additional components are added in the circuit, the conversion efficiency of the power supply is also adversely affected.

Therefore, the high-voltage surge protection function of more than 2500V can be achieved, excellent linear adjustment rate and power conversion efficiency performance can be achieved, the LED driving part of component structure cost can be guaranteed, and the whole safety and reliability of an LED lamp product can be improved.

Disclosure of Invention

One of the main advantages of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which uses an integrated control design and adopts a multi-level voltage protection manner to cope with bad impacts in various power grids.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which can improve key driving performance, and provide overvoltage protection at the input end and the output end of the core control unit, thereby greatly improving reliability.

Another advantage of the present invention is to provide a linear silicon controlled dimming lamp and a driving method thereof, which effectively cope with power grid fluctuations in different scenes by using three-level overvoltage protection, maintain a constant current dimming function, and prolong the service life of the lamp.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which can improve key driving performance and ensure the realization of multiple functions, such as improving linear regulation rate and power conversion efficiency.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which can perform multi-level voltage protection on a dimming control chip for providing an effective dimming lighting effect.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which are suitable for various load applications such as single color temperature or dual color temperature, and have good compatibility.

Another advantage of the present invention is to provide a linear silicon controlled dimming lamp and a driving method thereof, which adopts a high-voltage linear constant-current dimming driving manner, and has good silicon controlled dimming compatibility and smoothness, and a long service life.

Another advantage of the present invention is to provide a triac dimming lamp and a driving method thereof, which comprehensively performs an overall structure planning, has a small volume advantage, and is suitable for various illumination and installation environments.

Another advantage of the present invention is to provide a linear silicon controlled dimming lamp and a driving method thereof, wherein the linear silicon controlled dimming lamp includes a dimming control unit, a filtering unit and a stroboscopic removal control unit, so as to adjust a current for a lighting load to adjust a lighting brightness, wherein when an external switch is adjusted to a minimum current output gear according to a requirement, a stable output of a constant current to the lighting load can be still ensured, thereby ensuring a smooth dimming effect during an operation process, and avoiding undesirable phenomena such as a light jump flash, a breathing flash or an inability to start.

Another advantage of the present invention is to provide a triac dimming lamp and a driving method thereof, in which a relatively high surge voltage, for example, a surge voltage of 2500V or more, can be resisted without adding a plurality of voltage dependent resistors, without a diode suppressor having a large volume capacity, and without a plurality of capacitors connected in parallel.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which can achieve various performances of linear adjustment rate, surge overvoltage protection, short-circuit protection, etc. without adding additional electronic components.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which are suitable for driving requirements of multi-chromaticity dimming, and have practicability for dimming requirements of both cold white LEDs and warm white LEDs.

Another advantage of the present invention is to provide a triac dimming lamp and a driving method thereof, which can achieve the practical effects of stroboflash removal and low ripple.

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, wherein the temperature of the substrate is fed back, so as to avoid the over-temperature, i.e. the overheat protection function, of the whole linear thyristor dimming lamp, and further improve the service life of the LED lamp.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, wherein overvoltage protection for a key chip is improved, so as to improve driving safety and reliability, and ensure lamp quality.

Another advantage of the present invention is to provide a linear scr dimming lamp and a driving method thereof, which uses a small number of electronic components and ensures that the manufacturing cost is not increased.

Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.

In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved in a linear thyristor dimmer lamp comprising:

a rectifying unit for accessing an external power supply to obtain electric energy;

the input end of the dimming control unit is connected to the rectifying unit so as to control the obtained rectified electric energy;

the dimming control unit is connected with the input end and the output end in a manner of simultaneously performing overvoltage protection, wherein the dimming control unit linearly and constantly drives the luminous load at the rear end according to the input end so that the luminous load is supplied with energy without fluctuation.

According to an embodiment of the present invention, the dimming control unit further comprises a controller and at least two protection modules, wherein the at least two protection modules are respectively connected to the input terminal and the output terminal of the controller, and wherein each protection module is configured to set a different over-voltage protection threshold.

According to an embodiment of the present invention, the dimming control unit further comprises a controller and at least three protection modules, wherein two of the at least three protection modules are connected to the input of the controller, and one of the protection modules is connected to the output of the controller, wherein each of the protection modules is set to a different over-voltage protection threshold.

According to an embodiment of the present invention, the filtering unit is disposed at the rear end of the dimming control unit and at the output end of the protection module.

According to an embodiment of the invention, the de-strobe control unit is placed at the output of the filtering unit.

According to an embodiment of the present invention, the rectifying unit is disposed at the input end of the protection module at the front end of the dimming control unit.

According to an embodiment of the present invention, the rectifying unit is disposed at the front end of the dimming control unit and at the output end of the protection module.

According to an embodiment of the present invention, the rectifying unit is disposed between the two protection modules at the front end of the dimming control unit.

According to one embodiment of the invention, the controller is a high-voltage linear constant-current dimming control chip, wherein an output end of the controller is connected with the protection module, the filtering unit and the stroboscopic removal control unit, and a cathode of the light emitting load is connected with an output end of the stroboscopic removal unit.

According to an embodiment of the present invention, the rectifying unit further comprises a bridge stack, wherein the filtering unit further comprises at least one electrolytic capacitor, and wherein the stroboscopic removal control unit further comprises a stroboscopic removal control chip.

According to an embodiment of the invention, wherein the lighting load is implemented as a group of LED lamps consisting of a plurality of LED lamps.

According to one embodiment of the invention, the light emitting load adopts an LED lamp group consisting of cold white color temperature LEDs and warm white color temperature LEDs.

According to an embodiment of the present invention, the triac dimming lamp further comprises a color switch unit connected to a front end of the LED lamp set composed of the cold white color temperature LED and the warm white color temperature LED.

According to an embodiment of the invention, the colorimetric switch unit is implemented as a multi-stage gear type toggle switch or as a combination type toggle switch.

According to an embodiment of the present invention, the chroma switching unit further comprises: a switch module, a sub-controller, an output module and a sub-power supply module, wherein the sub-controller is powered by the sub-power supply module for control, wherein the switch module is connected to an input of the sub-controller, wherein the output module is connected to an output of the sub-controller, wherein the output module is further connected between the stroboscopic control unit and the lighting load.

According to another aspect of the present invention, the present invention further provides a driving method of a linear scr dimming lamp, comprising the steps of:

controlling the electric energy input to a luminous load in a constant current manner through a dimming control unit according to the input value;

if the input value is higher than a first threshold value, the input end of the dimming control unit is activated to perform overvoltage protection;

if the input value is higher than a second threshold value, the output end of the dimming control unit is activated to perform overvoltage protection; and

supplying power to the light emitting load in a constant current manner.

According to one embodiment of the invention, the first threshold is smaller than the second threshold.

According to an embodiment of the present invention, the driving method further includes the steps of: before rectification, if the input value is higher than a third threshold value, the input end of the dimming control unit is activated to perform overvoltage protection.

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

Fig. 1 is a schematic diagram of a prior art.

Fig. 2 is a schematic diagram of another prior art technique using high voltage linear constant current dimming control.

Fig. 3 is a functional block diagram of a triac dimming lamp and a driving method thereof according to a first preferred embodiment of the present invention.

Fig. 4 is a circuit diagram of a triac dimming lamp and a driving method thereof according to a first preferred embodiment of the present invention.

Fig. 5 is a functional block diagram of a triac dimming lamp and a driving method thereof according to a second preferred embodiment of the present invention.

Fig. 6 is a circuit diagram of a triac dimming lamp and a driving method thereof according to a second preferred embodiment of the present invention.

Fig. 7 is a functional block diagram of a triac dimming lamp and a driving method thereof according to a third preferred embodiment of the present invention.

Fig. 8 is a circuit diagram of a triac dimming lamp and a driving method thereof according to a third preferred embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

The invention provides a linear silicon controlled dimming lamp and a corresponding driving method. More particularly, an LED is used as a lighting device of a light emitting lamp, which provides an electric power drive with adjustable brightness, and the electric power is obtained from an external power source 90 at the front end and then transmitted to a light emitting load 50 at the rear end. For convenience of illustration, one end near the external power source 90 is used as an input end, and one end near the light-emitting load 50 is used as an output end. The external power source 90 is preferably 200-240V AC, and the external power source 90 may be at 260-280V or even higher voltage according to different power grid environments. In the preferred embodiment, the lighting load 50 is implemented as at least one high voltage LED lamp set.

As shown in fig. 3 to 4, in a first preferred embodiment, the triac dimmer lamp comprises: a rectifying unit 10, a dimming control unit 20, a filtering unit 30 and a stroboscopic removal control unit 40, wherein the power received from the external power 90 passes through the rectifying unit 10, the dimming control unit 20, the filtering unit 30 and the stroboscopic removal control unit 40 to drive the light-emitting load 50 at the rear end, wherein the light-emitting load 50 is connected to the output end of the stroboscopic removal control unit 40.

More specifically, the rectifying unit 10 directly obtains the power of the external power source. The dimming control unit 20 is connected to an output terminal of the rectifying unit 10 to obtain rectified power. The light-falling control unit 20 controls the light-emitting load 50 to be driven with a constant current through the filtering unit 30 and the stroboscopic-free control unit 40.

The lighting load 50 in the preferred embodiment is implemented as a single color LED light group. Specifically, the triac dimmer lamp further includes at least one dimmer switch 900, such as a triac dimmer, disposed at a front end of the rectifying unit 10. Preferably, the dimming switch, the rectifying unit 10, the dimming control unit 20, the filtering unit 30, and the stroboscopic removal control unit 40 are electrically fixed to a substrate.

It is worth mentioning that the dimming control unit 20 is connected between the external power source 90 and the lighting load 50 in a manner of performing an over-voltage protection at both the input and the output. That is, the dimming control unit 20 linearly outputs a constant current according to a predetermined control program according to the input value of the dimming unit 900 at the input terminal, thereby driving the light emitting loads 50 at the rear terminal such that the light emitting loads 50 are supplied with power without fluctuation. At the same time, the dimming control unit 20 also obtains multiple overvoltage protections during operation.

More, the dimming control unit 20 further includes a controller 21 and at least two protection modules 22, wherein the dimming control unit 20 is configured as a main body, and the dimming control unit 20 is connected to the rear end of the rectifying unit 10. The dimming control unit 20 is connected to a front end of the lighting load 50. The stroboscopic removal control unit 40 and the filtering unit 30 are respectively connected to the dimming control unit 20. In particular, the stroboscopic removal control unit 40 and the filtering unit are also connected to the lighting load 50 for directly supplying electrical energy to the lighting load 50. It is worth mentioning that the body is referred to herein as a core that is functional or current-controlling and does not mean a large area occupation on a structure or shape alone. At least two protection modules 22 are respectively disposed at the input end and the output end of the controller 21, so that the front end and the rear end of the controller 21 are both protected by overvoltage.

It is worth mentioning that the filtering unit 30 is cooperatively connected to the protection module 22 at the rear end of the dimming control unit 20.

Referring to fig. 3 and 4, the number of the protection modules 22 in the preferred embodiment is three, which are respectively defined as a first protection module 221, a second protection module 222 and a third protection module 223. The first protection module 221 and the second protection module 222 are coupled to an input of the controller 21, and the third protection module 223 is coupled to an output of the controller 21. Each of the protection modules 22 is preset with a certain overvoltage protection threshold so that the controller 21 is protected not only from both input and output but also from multiple levels of overvoltage.

It should be understood by those skilled in the art that three protection modules 22 in the preferred embodiment are used as examples, and in other equivalent embodiments, two-end protection and multi-stage protection can be similarly implemented by using two protection modules 22, and two-end protection and multi-stage protection can be similarly implemented by using four protection modules 22. More preferably, each of the protection modules 22 is set to a different overvoltage protection threshold.

Specifically, the rectifying unit 10 further includes a bridge stack BD, and the filtering unit 30 further includes electrolytic capacitors EC1, EC 2. It should be noted that, as can be understood by those skilled in the art, other required peripheral sub-circuits of the triac dimming lamp may be modified as needed, and are not described herein again.

More specifically, the controller 21 of the dimming control unit 20 is implemented as a high voltage linear constant current dimming control chip connected to the rear end of the rectifying unit 10, so that the luminance of the light emitting load 50 can be adjusted by adjusting the current. The first protection module 221 is connected to an input terminal of the rectifying unit 10, the second protection module 222 is connected between the rectifying unit 10 and the controller 21, and the third protection module 223 is connected to an output terminal of the controller 21. Therefore, overvoltage protection can be achieved at various locations, i.e., the front end of the rectifying unit 10, the rear end of the rectifying unit 10, and the rear end of the controller 21.

In other words, the rectifying unit 10 is connected to the output terminal of the first protection module 221 and the output terminal of the second protection module 222. The first protection module 221 and the second protection module 222 are both the protection module 22 at the front end of the dimming control unit 20. That is, each location may implement a different level of protection.

Preferably, the first protection module 221 is implemented as a voltage dependent resistor M1.

Preferably, the second protection module 222 is implemented as a metal film polypropylene capacitor (CBB capacitor).

Preferably, the third protection module 223 is implemented as a diac ZD3, which may have specific electrical parameters.

In addition, the filtering unit 30 and the stroboscopic removing unit 40 play roles in reducing ripple current and stroboscopic depth in the whole circuit, so that the corresponding LED lamp can achieve a good use effect without visible stroboscopic effect.

Further, a preferred embodiment of the present invention provides a driving method including the steps of:

controlling power input to a lighting load 50 by a dimming control unit 20 in a constant current according to the input value;

if the input value is higher than a first threshold value, the input end of the dimming control unit 20 is activated for overvoltage protection;

if the input value is higher than a third threshold, the output terminal of the dimming control unit 20 is activated for overvoltage protection; and

the light emitting load 50 is supplied with electric power in a constant current manner.

That is, the dimming control unit 20 performs current control according to the value inputted from the dimming switch 900, so that the current drawn by the lighting load 50 is smoothly changed, and thus the lighting effect is smoothly transited.

Of course, in the present preferred embodiment, the driving method further includes the steps of:

if the input value is higher than a second threshold, the input terminal of the dimming control unit 20 is activated for overvoltage protection.

The threshold number of input values is not a limitation of the inventive concept and the same technical effect can be achieved with two or three levels of threshold methods.

Here, the above-described structure according to the present preferred embodiment exemplifies that the driving method of the present preferred embodiment has a reliable protection effect. In an unstable power grid, when the effective value of the input voltage is higher than the first threshold value U1 (for example, U1 is AC 260V, and its corresponding voltage peak value is Um1 is approximately equal to 260V × 1.414 — 367.64V), the first protection module 221 at the input end of the rectification unit 10 is activated at this time, and plays a role of attracting excessive current, so that it can prevent an excessively high surge current from breaking down the controller 21.

When the effective value of the input voltage is higher than the second threshold value U2 (for example, U2 is AC 280V, and its corresponding voltage peak value is Um2 is approximately equal to 280V × 1.414V — 395.92V), the second protection module 222 at the output end of the rectification unit 10, i.e., the rear end, is activated, so as to prevent an excessively high inrush current from breaking down the controller 21.

When the effective value of the input voltage is higher than the third threshold value U3 (for example, U3 is AC300V, and its corresponding voltage peak value is Um3 is equal to about 300V × 1.414 — 424.2V), the third protection module 223 at the output end of the controller 21 is activated to conduct, and it plays a role of voltage limiting protection, so as to prevent the controller 21 from being broken down by an excessive surge current.

Specifically, when the first protection module 221 is activated, the voltage dependent resistor M1 is activated to conduct, which acts to draw excessive current. When the second protection module 222 is activated, the middle capacitor CBB is activated and turned on to charge and step down. When the third protection module 223 is activated, the diac ZD in the triac is activated and turned on, which plays a role of voltage limiting protection, so that the linear thyristor dimming lamp can integrally resist higher surge voltage and has obvious advantages of low cost, no EMI interference, no noise during dimming, easy realization of optoelectronic integration, and the like.

Further, a circuit schematic of the first preferred embodiment is shown in fig. 4. The dimming control unit 20 is connected to the rear of the output terminal of the rectifying unit 10. The stroboscopic removal control unit 40 is connected to an output terminal of the controller 21(U1) of the dimming control unit 20, and the filtering unit 30 and the third protection module 223 of the dimming control unit 20 are connected to the controller 21 of the dimming control unit 20. That is, the dimming control unit 20 of the triac dimming lamp is centrally disposed. It is worth mentioning that the center here refers to the core as functional or current controlling, and does not mean the center in structure or shape alone.

The specific pins of the controller 21 of the dimming control unit 20 in the preferred embodiment are shown in the following table:

pin number	Pin name	Description of the invention
			1	AL	Active load current suction pin
2	VL	Alternating voltage VAC linear adjustment compensation control pin
			3	VDD	Internal voltage stabilizer bypass pin
4	PD	Phase detection and active load disable function setting pin
			5	GND	Chip grounding pin
6	CSA	Active load circuit current detection pin
			7	CS	Current detection pin
8	OUT	Pin connected with cathode of LED lamp string

Other required peripheral sub-circuits of the triac dimming lamp, such as fuse resistors FR1, FR2, FR3, bridge stack BD1, high-voltage linear constant-current control chip U1, stroboscopic-removing control chip Q1, diodes D0, D1, D2, D3, rectifier diodes ZD1, ZD2, diac ZD3, patch resistors R1, R2, R2, R3 … …, patch capacitors C0, C1, C2 … …, piezoresistors M1, electrolytic capacitors EC1, EC2 and the like, are designed according to specific circuit-related parameters, and a person skilled in the art should understand that the related parameters are designed.

The dimming control unit 20 further includes an overheat protection module connected to the controller 21 and directly installed on the substrate for feeding back the temperature of the substrate, so as to avoid the over-temperature of the whole triac dimming lamp, i.e. an overheat protection function, and further improve the service life of the LED lamp and the triac dimming lamp.

In addition, the light-emitting load 50 is connected to the rear end of the output of the stroboscopic-removing control unit 40, that is, the LED lamp set is located at the output end of the whole linear thyristor dimming lamp.

In the preferred embodiment, it should be noted that the specific implementation manner of the protection module 22 is not limited to the above three examples, and various implementation manners may be replaced with each other. For example, the third protection module 223 employs a voltage dependent resistor, and the first protection module 221 employs a diac. The input end and the output end of the controller 21 are simultaneously protected, so that the safety and reliability of the lamp in the use process are greatly improved, and the product quality of the corresponding LED illuminating lamp is guaranteed to a great extent. The linear silicon controlled dimming lamp suitable for the LED lamp in the preferred embodiment adopts the integral structure design, achieves multiple electrical functions, improves key driving performance, such as linear adjustment rate and power supply conversion efficiency, adopts a linear constant current driving mode, has good silicon controlled dimming compatibility and smoothness, has long service life, comprehensively performs integral structure planning, has small volume advantage, and is suitable for multiple application occasions and installation environments.

A linear scr dimming lamp according to a second preferred embodiment of the present invention is illustrated, as shown in fig. 5 to 6, wherein the linear scr dimming lamp includes a rectifying unit 10A, a dimming control unit 20A, and a filtering unit 30A, and the structures of the rectifying unit 10A, the dimming control unit 20A, and the filtering unit 30A are similar to the rectifying unit 10, the dimming control unit 20, and the filtering unit 30 of the linear scr dimming lamp according to the first preferred embodiment, and the present invention is not repeated. The LED lamp provides an electric drive with adjustable luminance, and obtains electric power from an external power supply 90A at the front end and transmits the electric power to a lighting load 50A at the rear end. The external power source 90A is preferably 200-240V AC.

In the preferred embodiment, the lighting load 50A is implemented as a bi-color LED light set. In the preferred embodiment, the lighting load 50A is implemented as a multi-color LED light set. That is, the lighting load 50A further includes a cold white warm LED lamp set 51A and a warm white warm LED lamp set 52A.

The triac dimming lamp of the preferred embodiment further comprises a color switch unit 60A connected to the front end of the lighting load 50A formed by the cold white color temperature LED lamp set 51A and the warm white color temperature LED lamp set 52A. The colorimetric switch unit 60A is implemented as a multi-stage type tap switch or a combination tap switch. Preferably, the chroma switch unit 60A is implemented as a three-gear or four-gear dial switch. Preferably, the high-voltage conducting type dial switch. The lighting load 50B is composed of two or more groups of high-voltage LED lamp bead devices with different color temperature settings, which are arranged in a certain serial-parallel manner, and correspond to each gear output end of the dial switch (for example, 1600K to 3800K are warm white color temperatures, and 4200K to 8000K are cold white color temperatures).

A linear scr dimming lamp according to a third preferred embodiment of the present invention is illustrated, as shown in fig. 7 to 8, wherein the linear scr dimming lamp includes a rectifying unit 10B, a dimming control unit 20B, and a filtering unit 30B, and the structures of the rectifying unit 10B, the dimming control unit 20B, and the filtering unit 30B are similar to the rectifying unit 10, the dimming control unit 20, and the filtering unit 30 of the linear scr dimming lamp according to the first preferred embodiment, and the present invention is not repeated. The LED lamp provides an electric drive with adjustable luminance, and obtains electric power from an external power supply 90B at the front end and transmits the electric power to a lighting load 50B at the rear end. The external power source 90B is preferably 200-240V AC.

In the preferred embodiment, the lighting load 50B is implemented as a multi-color LED light set. That is, the lighting load 50B further includes a cold white warm LED lamp set 51B and a warm white warm LED lamp set 52B. The triac dimming lamp of the preferred embodiment further comprises a color switch unit 60B connected to the front end of the lighting load 50B formed by the cold white color temperature LED lamp set 51B and the warm white color temperature LED lamp set 52B.

Unlike the second embodiment, the chroma switching unit 60B further includes: a switch module 61B, a sub-controller 62B, an output module 63B and a sub-power supply module 64B. The sub-controller 62B is controlled by the sub-power supply module 64B. The switch module 61B is coupled to an input of the sub-controller 62B and the output module 63B is coupled to an output of the sub-controller 62B. The output module 63B is further connected between the stroboscopic-removing control unit 40B and the light-emitting load 50B.

More particularly, the switch module 61B is implemented as a general low-voltage conducting type of toggle switch. The sub-controller 62B is a programmable single chip microcomputer.

In the preferred embodiment, the sub-circuit design of the switch module 61B and the sub-controller 62B is combined to realize the LED color temperature selection function. Specifically, the sub-controller 62B is set with a program in a predetermined manner. The chromaticity switch unit 60B has several preset operation pins (S-a, S-B, S-c, S-d) of different color temperature function positions corresponding to the switch module 61B, which are respectively electrically connected to corresponding function pins (TEST, RST, P1.5) for command input signals and a peripheral circuit ground GND in the sub-controller 62B, and the function pins P1.2 and P1.7 in the sub-controller 62B are used as ports for command output signals, and respectively connected to the cathodes of the cold white color temperature LED lamp set 51B and the warm white color temperature LED lamp set 52B through power switch tubes Q2 and Q3, respectively.

When a certain functional gear is on the switch module 61B, a corresponding certain two pins on the gear are in a connected state, and corresponding 1 or 2 functional pins for instruction input signals on the sub-controller 62B are activated by energization, and at this time, the sub-controller 62B immediately executes related instruction operation processing, and then outputs an instruction result signal through the functional pins P1.2 and/or P1.7. The level signals on the pins P1.2 and/or P1.7 are amplified correspondingly through the power switch tubes Q2 and/or Q3, and finally output to the cathode (W-end) of the warm white color temperature LED lamp set 52B and/or the cathode (C-end) of the cold white color temperature LED lamp set 51B respectively.

When the corresponding LED warm white function shift position on the switch module 61B is selected, the corresponding S-a and S-B pins at the S1 shift position are in a connected state, the TEST and RST function pins at the corresponding input signal ends on the sub-controller 62B are energized and activated, after the instruction operation processing of the sub-controller 62B, the function pin P1.2 outputs a corresponding level signal, and then the corresponding signal amplification processing is performed through the power switch tube Q2, and finally the corresponding level signals are respectively output to the cathode (W-end) of the warm white color temperature LED lamp group 52B, at this time, the warm white color temperature LED lamp group 52B is turned on to light up.

Linear silicon controlled rectifier lamps and lanterns of adjusting luminance can compromise many-sided performance such as linear adjustment rate, surge overvoltage protection, short-circuit protection under the condition that does not increase extra electronic components, and it is applicable to the drive demand that polychrome was adjusted luminance, and the demand of adjusting luminance to cold white warm LED and warm white warm LED all has the practicality to it can reach the actual effect of going stroboscopic, low ripple, and its electronic components that use quantity is less guarantee manufacturing cost and does not increase.

The specific identifier of the triac dimming lamp in the preferred embodiment is as follows: fuse resistors FR1, FR2, FR3, a bridge stack BD1, a high-voltage linear constant current control chip U1, a stroboscopic-removing control chip Q1, diodes D0, D1, D2, D3, rectifier diodes ZD1, ZD2, a bidirectional trigger diode ZD3, a chip resistor R1, R2, R2, R3 … …, a chip capacitor C0, C1, C2 … …, a piezoresistor M1, an electrolytic capacitor EC1, an EC2, a power switch tube (MOS tube) Q2, Q3, a common type code-pulling switch (common 12V/50V low-voltage conduction type code-pulling switch) S1 and an ultra-low-power consumption programmable single-chip Microcomputer (MCU) U2 with a 16-bit bus based on a Reduced Instruction Set (RISC) architecture.

The specific pins of the sub-controller 62B of the chroma switch unit 60B in the preferred embodiment are shown in the following table:

pin number	Pin name	Description of the invention
			1	DVCC	MCU operating voltage input end pin
2	P1.2	P1.2 signal addressing pin
			3	P1.5	P1.5 signal addressing pin
4	P1.6	P1.6 signal addressing pin (spare here)
			5	P1.7	P1.7 signal addressing pin
6	RST	MCU rebooting function pin
			7	TEST	MCU circular telegram detects function pin
8	DVSS	MCU earthing terminal pin

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A triac dimmable lamp, comprising:

2. The triac dimmable lamp of claim 1, wherein said dimming control unit further comprises a controller and at least two protection modules, wherein at least two of said protection modules are connected to an input and an output of said controller, respectively, wherein each of said protection modules is configured to have a different over-voltage protection threshold.

3. The triac dimming lamp of claim 1, wherein said dimming control unit further comprises a controller and at least three protection modules, wherein two of said at least three protection modules are connected to an input of said controller and one of said protection modules is connected to an output of said controller, wherein each of said protection modules is set to a different overvoltage protection threshold.

4. The triac dimming lamp of claim 2 or 3, wherein said filtering unit is placed at the rear end of said dimming control unit at the output of said protection module.

5. The triac dimmable lamp according to claim 4, wherein said desstrobing control unit is disposed at an output of said filtering unit.

6. The triac dimming lamp of claim 2 or 3, wherein said rectifying unit is placed at the front end of said dimming control unit at the input of said protection module.

7. The triac dimming lamp of claim 2, wherein said rectifying unit is placed at the front end of said dimming control unit at the output of said protection module.

8. The triac dimming lamp of claim 3, wherein said rectifying unit is disposed between two said protection modules at a front end of said dimming control unit.

9. The triac dimming lamp of claim 2 or 3, wherein the controller is a high voltage linear constant current dimming control chip, wherein an output of the controller is connected to the protection module, the filtering unit and the stroboscopic removal control unit, wherein a cathode of the lighting load is connected to an output of the stroboscopic removal unit.

10. The triac dimmable lamp according to claim 9, wherein said rectifying unit further comprises a bridge stack, wherein said filtering unit further comprises at least one electrolytic capacitor, wherein said desstrobing control unit further comprises a desstrobing control chip.

11. The triac dimmable lamp according to claim 10, wherein said lighting load is implemented as a group of LED lamps comprising a plurality of LED lamps.

12. The triac dimmable lamp of claim 11, wherein said lighting load employs a LED bank of cold white color temperature LEDs and warm white color temperature LEDs.

13. The triac dimmed lighting fixture according to claim 12, wherein the triac dimmed lighting fixture further comprises a color switch unit coupled to a front end of the LED bank using cool white color temperature LEDs and warm white color temperature LEDs.

14. The triac dimmable lamp according to claim 12, wherein said chroma switch unit is implemented as a multi-stage gear type pull switch or as a combination pull switch.

15. The triac dimmed lamp according to claim 12, wherein the chroma switch unit further comprises: a switch module, a sub-controller, an output module and a sub-power supply module, wherein the sub-controller is powered by the sub-power supply module for control, wherein the switch module is connected to an input of the sub-controller, wherein the output module is connected to an output of the sub-controller, wherein the output module is further connected between the stroboscopic control unit and the lighting load.

16. A triac dimming lamp as claimed in claim 15, wherein said switch module is implemented as a general low voltage conducting type of dip switch, wherein said sub-controller is a programmable single chip microcomputer.

17. A driving method of a linear silicon controlled rectifier dimming lamp comprises the following steps:

supplying power to the light emitting load in a constant current manner.

18. The triac dimming lamp of claim 14, wherein said first threshold is less than a second threshold.

19. The triac dimming lamp of claim 14, wherein said dimming control unit further comprises a controller and at least two protection modules, wherein at least two of said protection modules are connected to an input and an output of said controller, respectively, wherein each of said protection modules is configured to set a different overvoltage protection threshold.

20. The triac dimmable lamp according to claim 16, wherein said driving method further comprises the steps of: before rectification, if the input value is higher than a third threshold value, the input end of the dimming control unit is activated to perform overvoltage protection.

21. The triac dimming lamp of claim 20, wherein said third threshold is less than said first threshold.