WO2022048114A1

WO2022048114A1 - Linear silicon-controlled rectifier dimming lamp and driving method therefor

Info

Publication number: WO2022048114A1
Application number: PCT/CN2021/077157
Authority: WO
Inventors: 武良举
Original assignee: 佛山市威得士灯饰电器有限公司
Priority date: 2020-09-02
Filing date: 2021-02-22
Publication date: 2022-03-10

Abstract

Provided is a linear silicon-controlled rectifier dimming lamp, comprising: a rectifying unit for connecting to an external power supply to obtain electric energy; a dimming control unit, wherein an input end thereof is connected to the rectifying unit, so as to control the obtained rectified electric energy; a filtering unit; and a strobe eliminating control unit, wherein the filtering unit and the strobe eliminating control unit are respectively connected to an output end of the dimming control unit, such that the electric energy passing through the rectifying unit, the dimming control unit, the filtering unit and the strobe eliminating control unit drives a light-emitting load at a constant current; the dimming control unit is connected in a manner that an input end and an output end perform overvoltage protection at the same time; and the dimming control unit drives the light-emitting load at a rear end in a linear constant-current manner according to the input end, such that the light-emitting load is powered without fluctuation.

Description

Linear thyristor 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 thyristor dimming lamp and a driving method thereof.

Background technique

The LED lamp mainly includes a driving part adapted to a lamp board composed of multiple groups of LEDs. At present, the driving part of most LED lamps is a switching power supply type, especially a flyback switching power supply, which mainly includes a rectifier circuit, a power stage circuit and a control circuit. These power stage circuits mainly contain switch tubes, such as triodes. First, the rectifier circuit receives AC mains power, and after passing through the rectifier circuit, it enters the power stage circuit, and the power stage circuit performs voltage conversion. . In addition, the power stage circuit of the flyback switching power supply includes a transformer composed of the primary and secondary sides in addition to the switch tube, and the transformer occupies a large space and is difficult to design and arrange, and the realization cost of its own devices is high, and it is not easy to market.

As shown in FIG. 1, another prior art using linear constant current drive is used. The drive part of the LED lamp as shown includes: a rectifier circuit A, a dimming circuit B, a linear constant current circuit C and a load LED group, wherein all the The thyristor dimming circuit B and the linear constant current circuit C independently become two different functional module circuits. That is, the rectifier circuit A is connected to power input, such as AC mains, and then passes through the dimming circuit B, and/or the linear constant current circuit C, etc., so as to drive the load LED group with constant current. glow. Moreover, the thyristor dimming circuit B and the linear constant current circuit C are not susceptible to signal interference when they work independently, so that the compatibility and smoothness of dimming can be ensured, and can be guaranteed within a wide input voltage range. Its good linear adjustment rate. That is to say, by controlling the switch tube to make it work in the linear region, and adjust the output current to keep the average output current constant.

Although the prior art can meet the requirements of functional stability to a certain extent, it requires 1 to 2 more linear constant-current chips in the implementation of the hardware structure, and the corresponding power switch tubes and other elements on the local circuit are required. The device consumes power to a certain extent, resulting in a decrease in power conversion efficiency and power factor. Or, while achieving higher conversion efficiency and high power factor, compatibility and smoothness of thyristor dimming will be sacrificed, resulting in the undesirable phenomenon of light flickering during the dimming process of the load LED group. Moreover, if additional functions are to be implemented, such as anti-flicker, low ripple, overvoltage protection, surge protection, etc., it is necessary to add corresponding circuit units on the basis of the above design, such as anti-flicker Current stabilization circuit D, filter unit circuit, surge and overvoltage protection circuit E, etc. On the whole, one aspect is that it is easy to consider incompleteness as a whole, and the other aspect is that such a design will undoubtedly increase the manufacturing cost of the entire circuit.

Another prior art as shown in FIG. 2, the driving part of the LED lamp mainly includes a rectifier circuit, a high-voltage linear constant-current dimming circuit, a filter circuit, a surge and overvoltage protection circuit, a stroboscopic 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 its sub-circuits, which can not only ensure the compatibility and smoothness of dimming, but also can operate in a wide input range. Good linear regulation is guaranteed over the voltage range. At the same time, it is simpler than the technology shown in FIG. 1, and the number of components used is reduced, thereby reducing the manufacturing cost to a certain extent.

However, although the prior art adopts high-voltage linear control, it also has the following unavoidable shortcomings, or can not well overcome the following common performance deficiencies at the same time: narrow input voltage range; low power conversion efficiency; poor linear regulation rate ; Poor dimming compatibility; Low power factor, etc. It is worth mentioning that the linear regulation rate and power conversion efficiency are very important performance indicators. Therefore, it is very necessary to improve the linear adjustment rate and conversion efficiency of the output of the driving part of the LED lamp.

In addition, for the high-voltage linear power supply of LED lamps, due to the need to consider the size of the power supply, it is usually necessary to use SMD chip varistor components to resist surges during switching power supplies. It can be understood by those skilled in the art that the surge here refers to an instantaneous overvoltage exceeding the normal working voltage. Essentially, a surge is a violent pulse that occurs in just a few millionths of a second. Moreover, for special grid environments, such as residential power supply in some developing countries, large voltage fluctuations occasionally occur. In very rare cases, the alternating current can even reach AC300V, which is a very unfavorable condition for turning on the lights and so on. At present, the varistor element with the largest parameter specification can only play a role in resisting the surge voltage within 2000V at most.

However, the prior art employs more common conventional design methods. The varistor element that plays a surge protection function is set and connected to the rectifier circuit located at the front end of the power input end, and the varistor (M1) is connected to the high-voltage linear constant current dimming located in the main circuit part. Before the circuit, the varistor (M1) is usually placed in parallel with the output terminals of the bridge stack (BD). This can only play the role of the varistor (M1) in resisting surge high voltage within 2000V, but it cannot do anything for applications that require surge high voltage protection of 2500V or more. For applications that need to withstand higher surge voltages of 2500V or above, a circuit that only relies on a single component as a surge and overvoltage protection module cannot meet the requirements for realizing this function. Under conventional thinking, in order to achieve this, two or more varistors (M1) are often required, or a suppressor diode element with a larger volume capacity is used, or a plurality of capacitors are used in parallel, and so on. However, no matter which method, the circuit design volume will be increased, the original volume advantage will be lost, and the cost of components will be additionally increased. At the same time, due to the addition of additional components in the circuit, the conversion efficiency of the power supply will also be adversely affected.

Therefore, it can not only achieve the high-voltage surge protection function of more than 2500V, but also achieve excellent linear regulation rate and power conversion efficiency performance, and also ensure the LED drive part of the component structure cost, which will further contribute to the overall safety of LED lighting products. Improved reliability.

SUMMARY OF THE INVENTION

A main advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, which utilizes an integrated control design and adopts a multi-level voltage protection method to cope with adverse impacts in various power grids.

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

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, which adopts three-level overvoltage protection, effectively copes with power grid fluctuations in different scenarios, maintains the constant current dimming function, and improves the use of the lamp life.

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

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

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

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

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, which comprehensively carry out overall structural planning, have a small volume advantage, and are suitable for various lighting and installation environments.

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, wherein the linear thyristor dimming lamp includes a dimming control unit, a filtering unit and a de-flicker control unit, For a lighting load to adjust the current to adjust the brightness of the light, when an external switch is adjusted to the minimum current output gear according to the demand, it can still ensure the stable output of the constant current to the lighting load, so as to ensure the dimming effect during the operation. Smooth, there will be no undesirable phenomena such as light flickering, breathing flickering or failure to start.

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, in which there is no need to add multiple varistors, no need for suppressing diode elements with larger volume and capacity, and no need to connect multiple capacitors in parallel to resist the Higher surge voltages, such as surge voltages of 2500V or more.

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, in which linear adjustment rate, surge overvoltage protection, short circuit protection, etc. can be taken into account without adding additional electronic components. aspect performance.

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

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, which can achieve the practical effects of eliminating stroboscopic 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 to avoid the overheating of the entire linear thyristor dimming lamp, that is, the overheating protection function , and further improve the service life of LED lamps.

Another advantage of the present invention is to provide a linear thyristor dimming lamp and a driving method thereof, wherein by improving the overvoltage protection of key chips, the safety and reliability of the drive are further improved, and the quality of the lamp is guaranteed.

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

Other advantages and features of the invention will be fully realized from the following detailed description and may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to one aspect of the present invention, a linear thyristor dimming lamp of the present invention that can achieve the foregoing object and other objects and advantages includes:

a rectifier unit for accessing an external power source to obtain electrical energy;

a dimming control unit, the input end of which is connected to the rectification unit for controlling the obtained rectified electric energy;

a filtering unit, and an anti-flicker control unit, wherein the filter unit and the anti-flicker control unit are respectively connected to the output end of the dimming control unit, so that after the rectification unit, the dimming control unit The electric energy of the light control unit, the filter unit and the de-strobe control unit is driven by a constant current to drive a light-emitting load, wherein the dimming control unit performs overvoltage protection at the input end and the output end at the same time. is connected, wherein the dimming control unit drives the light-emitting load of the rear end linearly and constant current according to the input terminal, so that the light-emitting load is supplied with energy without fluctuation.

According to an embodiment of the present invention, the dimming control unit further includes 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, wherein Each of the protection modules is set with different overvoltage protection thresholds.

According to an embodiment of the present invention, the dimming control unit further includes a controller and at least three protection modules, wherein two of the at least three protection modules are connected to the input end of the controller, the One of the protection modules is connected to the output of the controller, wherein each of the protection modules is set with a different overvoltage protection threshold.

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

According to an embodiment of the present invention, the de-flicker 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 output end of the protection module at the front end of the dimming control unit.

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

According to an embodiment of the present invention, the controller is a high-voltage linear constant current dimming control chip, wherein the output end of the controller is connected to the protection module, the filter unit and the anti-flicker control unit, Wherein the negative pole of the light-emitting load is connected to the output end of the de-strobe unit.

According to an embodiment of the present invention, the rectifying unit further includes a bridge stack, wherein the filtering unit further includes at least one electrolytic capacitor, and the anti-flicker control unit further includes an anti-flicker control chip.

According to an embodiment of the present invention, the light-emitting load is implemented as an LED lamp group composed of a plurality of LED lamps.

According to an embodiment of the present invention, the light-emitting load adopts an LED lamp group composed of cool white temperature LEDs and warm white temperature LEDs.

According to an embodiment of the present invention, the linear thyristor dimming lamp further comprises a chromaticity switch unit connected to the front end of the LED lamp group consisting of cool white temperature LEDs and warm white temperature LEDs.

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

According to an embodiment of the present invention, the chromaticity switch unit further includes: 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 to perform control, wherein the switch module is connected to the input of the sub-controller, wherein the output module is connected to the output of the sub-controller, wherein the output module is further connected to the de-strobe between the control unit and the light-emitting load.

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

According to the input value, the electric energy input to a lighting load is controlled by a dimming control unit with constant current;

If the input value is higher than a first threshold value, the input terminal of the dimming control unit is activated for overvoltage protection;

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

Electric energy is supplied to the light-emitting load in a constant current manner.

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

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

Further objects and advantages of the present invention will be fully realized by an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present invention are fully embodied by the following detailed description, drawings and claims.

Description of drawings

FIG. 1 is a schematic diagram of the principle of a prior art.

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

FIG. 3 is a principle block diagram of a linear thyristor dimming lamp and a driving method thereof according to the first preferred embodiment of the present invention.

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

FIG. 5 is a principle block diagram of a linear thyristor dimming lamp and a driving method thereof according to the second preferred embodiment of the present invention.

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

FIG. 7 is a schematic block diagram of a linear thyristor dimming lamp and a driving method thereof according to the third preferred embodiment of the present invention.

FIG. 8 is a schematic circuit diagram of a linear thyristor dimming lamp and a driving method thereof according to the third preferred embodiment of the present invention.

detailed description

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

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and to simplify the description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus the above terms should not be construed as limiting the invention.

It should be understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be one. The number may be plural, and the term "one" should not be understood as a limitation on the number.

The invention provides a linear thyristor dimming lamp and a corresponding driving method. More, it is a lighting device using LED as a lighting fixture, which provides electric power drive with dimmable brightness, obtains electric power from an external power supply 90 at the opposite front and transmits it to a lighting load 50 at the opposite rear. For the convenience of description, the end close to the external power supply 90 is used as the input end, and the end close to the light-emitting load 50 is used as the output end. The external power supply 90 is preferably 200-240V alternating current. According to different grid environments, the external power supply 90 may be at 260-280V or even higher voltage. In this preferred embodiment, the light-emitting load 50 is implemented as at least one high-voltage LED lamp group.

As shown in the first preferred embodiment shown in FIG. 3 to FIG. 4 , the linear thyristor dimming lamp includes: a rectifying unit 10 , a dimming control unit 20 , a filtering unit 30 and a strobe control unit 40 , wherein the electric energy received from the external power supply 90 drives the light-emitting load 50 at the rear end through the rectifier unit 10 , the dimming control unit 20 , the filter unit 30 and the anti-flicker control unit 40 , The light-emitting load 50 is connected to the output terminal of the de-strobe control unit 40 .

More specifically, the rectifying unit 10 directly obtains the electric energy of the external power source. The dimming control unit 20 is connected to the output end of the rectification unit 10 to obtain rectified electric energy. After the light-off control unit 20 is controlled according to the input value, the light-emitting load 50 is driven by a constant current through the filter unit 30 and the anti-flicker control unit 40 .

In this preferred embodiment, the light-emitting load 50 is implemented as a monochromatic LED light group. Specifically, the linear thyristor dimming lamp further includes at least one dimming switch 900 , such as a thyristor dimmer, disposed at the 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 anti-flicker control unit 40 are energized and fixed to a substrate.

It is worth mentioning that the dimming control unit 20 is connected between the external power supply 90 and the light-emitting load 50 in a manner of simultaneously performing overvoltage protection at the input end and the output end. That is to say, according to the input value of the dimming unit 900 at the input end, the dimming control unit 20 outputs a linear constant current according to a predetermined control program, thereby driving the light-emitting load 50 at the rear end, so that the light-emitting The load 50 is energized without fluctuations. 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 provided as a main body, wherein the dimming control unit 20 is connected to the rear end of the rectifier unit 10 . The dimming control unit 20 is connected to the front end of the lighting load 50 . The anti-flicker control unit 40 and the filter unit 30 are connected to the dimming control unit 20, respectively. Specifically, the de-stroboscopic control unit 40 and the filtering unit are also connected to the light-emitting load 50 for directly supplying electrical energy to the light-emitting load 50 . It is worth mentioning that the main body here refers to the core as a function or current control, and does not simply mean a large area occupied in structure or shape. At least two of the protection modules 22 are placed at the input end and the output end of the controller 21 respectively, so that both the front and rear ends of the controller 21 are protected against overvoltage.

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

As shown in FIG. 3 and FIG. 4 , there are three protection modules 22 in this preferred embodiment, 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 connected to the input end of the controller 21 , and the third protection module 223 is connected to the output end of the controller 21 . Each of the protection modules 22 is preset with a certain overvoltage protection threshold, so that the controller 21 is not only protected by multiple levels of overvoltage from both the input and output terminals.

It should be understood by those skilled in the art that the three protection modules 22 in this preferred embodiment are examples, and in other equivalent embodiments, two protection modules 22 can also be used to achieve both end protection and multiple protection. Level protection, the use of four protection modules 22 can also achieve both ends protection and multi-level protection. More preferably, each of the protection modules 22 is respectively set with different overvoltage protection thresholds.

Specifically, the rectifying unit 10 further includes a bridge stack BD, and the filtering unit 30 further includes electrolytic capacitors EC1 and EC2. It is worth mentioning that, those skilled in the art can understand that other required peripheral sub-circuits of the linear thyristor dimming lamp can be modified as required, which will not be repeated here.

More specifically, the controller 21 of the dimming control unit 20 is implemented as a high-voltage linear constant current dimming control chip, and is connected to the rear end of the rectifier unit 10, so that the current can be adjusted to adjust the The brightness of the light-emitting load 50 . The first protection module 221 is connected to the input end of the rectifier unit 10 , the second protection module 222 is connected between the rectifier unit 10 and the controller 21 , and the third protection module 223 is connected to the output of the controller 21 . Therefore, overvoltage protection can be implemented in different positions, ie, the front end of the rectifier unit 10 , the rear end of the rectifier unit 10 and the rear end of the controller 21 .

In other words, the rectifier 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 modules 22 at the front end of the dimming control unit 20 . That said, each location can achieve different levels of protection.

Preferably, the first protection module 221 is implemented as a varistor 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 bidirectional trigger diode ZD3, which may have specific electrical parameters.

In addition, the filtering unit 30 and the stroboscopic removal unit 40 play the role of reducing ripple current and stroboscopic depth in the overall circuit, so that the corresponding LED lamps can achieve a good use effect without video flicker.

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

According to the input value, the electric energy input to a light-emitting load 50 is controlled by a dimming control unit 20 with constant current;

If the input value is higher than a first threshold, the input terminal 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

Electric energy is supplied to the light-emitting load 50 in a constant current manner.

That is to say, the dimming control unit 20 performs current control according to the value input from the dimming switch 900 , so that the current obtained by the lighting load 50 changes smoothly, and the lighting effect is also smoothly transitioned.

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

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 present invention, and the same technical effect can be achieved by adopting a two-level or three-level threshold method.

Here, according to the above structure of this preferred embodiment, it is illustrated that the driving method of this 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 U1 (for example, U1 is AC 260V, and the corresponding voltage peak value is Um1, which is approximately equal to 260V*1.414=367.64V), then it is located in the The first protection module 221 at the input end of the rectifier unit 10 is activated to attract excess current, thereby preventing the controller 21 from being broken down by excessive inrush current.

When the effective value of the input voltage is higher than the second threshold U2 (for example, U2 is AC 280V, the corresponding voltage peak value is Um2 approximately equal to 280V*1.414=395.92V), then at the output end of the rectifier unit 10, That is, the second protection module 222 at the rear end is activated, so as to prevent the controller 21 from being broken down by an excessively high surge current.

When the effective value of the input voltage is higher than the third threshold U3 (for example, U3 is AC 300V, the corresponding voltage peak value is Um3 approximately equal to 300V*1.414=424.2V), then at this time the third threshold at the output end of the controller 21 The three protection modules 223 are activated and turned on, and at this time, they play the role of voltage limiting protection, so as to prevent the controller 21 from being broken down by an excessively high surge current.

Specifically, when the first protection module 221 is activated, the varistor M1 in the first protection module 221 is activated and turned on, which plays the role of attracting excess current. When the second protection module 222 is activated, the capacitor CBB element in it is activated and turned on to charge and reduce the voltage. When the third protection module 223 is activated, the bidirectional trigger diode ZD is activated and turned on, which plays the role of voltage limiting protection, so that the linear thyristor dimming lamp can resist a higher surge voltage as a whole It has obvious advantages such as low cost, no EMI interference, no noise for dimming, and easy integration of optoelectronics.

More, a circuit diagram of the first preferred embodiment shown in FIG. 4 is shown. The dimming control unit 20 is connected to the rear of the output end of the rectifier unit 10 . The anti-flicker control unit 40 is connected to the output end of the controller 21 ( U1 ) of the dimming control unit 20 , the filtering unit 30 and the third protection of the dimming control unit 20 The module 223 is connected to the controller 21 of the dimming control unit 20 . That is, the dimming control unit 20 of the thyristor dimming lamp is arranged centrally. It is worth mentioning that the center here refers to the core as a functional or current control, and does not simply mean the center in structure or shape.

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

管脚号pin number	管脚名称pin name	描述describe
11	ALAL	主动负载电流吸引脚Active load current draw pin
22	VLVL	交流电压VAC线性调整补偿控制引脚AC voltage VAC linear adjustment compensation control pin
33	VDDVDD	内部稳压器旁路引脚Internal Regulator Bypass Pin
44	PDPD	相位检测和主动负载禁用功能设置引脚Phase detection and active load disable function setup pins
55	GNDGND	芯片接地引脚 Chip ground pin
66	CSACSA	主动负载电路电流检测引脚Active Load Circuit Current Sense Pin
77	CSCS	电流检测引脚 Current detection pin
88	OUTOUT	与LED灯串负极连接引脚Connect the pin with the negative pole of the LED string

Other required peripheral sub-circuits of the linear thyristor dimming lamps such as fuse resistors FR1, FR2, FR3, bridge stack BD1, high-voltage linear constant current control chip U1, anti-flicker control chip Q1, diodes D0, D1, D2 , D3, rectifier diode ZD1, ZD2, bidirectional trigger diode ZD3, chip resistor R1, R2, R2, R3..., chip capacitor C0, C1, C2..., varistor M1, electrolytic capacitor EC1, EC2, etc. It depends on the design of specific circuit-related parameters, which should be understood by those skilled in the art.

The dimming control unit 20 further includes an overheat protection module connected to the controller 21 and directly mounted on the substrate for feedback on the temperature of the substrate, avoiding the entire linear controllable The temperature of the silicon dimming lamp is too high, that is, the overheating protection function, which further improves the service life of the LED lamp and the linear thyristor dimming lamp.

In addition, the light-emitting load 50 is connected to the output rear end of the de-strobe control unit 40, that is, the LED light group is located at the output end of the linear thyristor dimming lamp as a whole.

In this preferred embodiment, it is worth mentioning that the specific implementation of the protection module 22 is not limited to the above three examples, and various implementations can also be replaced with each other. For example, the third protection module 223 adopts a varistor, and the first protection module 221 adopts a bidirectional trigger diode. Protection is provided at the input and output ends of the controller 21 at the same time, which greatly improves the safety and reliability of the lamps during use, and ensures the product quality of the corresponding LED lighting lamps to a large extent. The linear thyristor dimming lamp suitable for LED lamps in this preferred embodiment adopts an integral structural design, which realizes various electrical functions and improves key driving performance, such as linear adjustment rate and power conversion efficiency. The linear constant current driving method has good thyristor dimming compatibility and smoothness, and has a long service life. application and installation environment.

A linear thyristor dimming lamp according to the second preferred embodiment of the present invention is illustrated, as shown in FIG. 5 to FIG. 6 , wherein the thyristor dimming lamp includes a rectifier unit 10A, a dimming control unit 20A, A filter unit 30A, wherein the rectifier unit 10A, the dimming control unit 20A and the filter unit 30A have the same structures as the rectifier unit 10 of the linear thyristor dimming lamp of the first preferred embodiment, The dimming control unit 20 and the filtering unit 30 are similar, and will not be repeated in the present invention. The LED lamps are driven by electric energy with dimmable brightness, and the electric energy is obtained from an external power supply 90A at the opposite front end and then transmitted to a light-emitting load 50A at the opposite rear end. The external power supply 90A is preferably 200-240V alternating current.

In this preferred embodiment, the light-emitting load 50A is implemented with a two-color LED light group. In this preferred embodiment, the light-emitting load 50A is implemented with a multi-color LED light group. That is to say, the light-emitting load 50A further includes a cool white temperature LED lamp group 51A and a warm white temperature LED lamp group 52A.

The linear thyristor dimming lamp of this preferred embodiment further includes a chromaticity switch unit 60A connected to the light-emitting load composed of the cool white temperature LED lamp group 51A and the warm white temperature LED lamp group 52A 50A front end. The chromaticity switch unit 60A is implemented as a multi-stage toggle switch or a combined toggle switch. Preferably, the chromaticity switch unit 60A is implemented as a three-position or four-position DIP switch. Preferably, it is a high-voltage conduction type DIP switch. The luminous load corresponding to each gear output end of the dip switch is composed of two or more sets of high-voltage LED lamp bead devices with different color temperature settings, which are arranged in a certain series-parallel manner. 50B (for example, 1600K to 3800K is a warm white temperature, and a color temperature of 4200K to 8000K is a cool white temperature).

A linear thyristor dimming lamp according to the third preferred embodiment of the present invention is illustrated, as shown in FIG. 7 to FIG. 8 , wherein the thyristor dimming lamp includes a rectifier unit 10B, a dimming control unit 20B, A filter unit 30B, wherein the rectifier unit 10B, the dimming control unit 20B and the filter unit 30B have the same structures as the rectifier unit 10 of the linear thyristor dimming lamp of the first preferred embodiment, The dimming control unit 20 and the filtering unit 30 are similar, and will not be repeated in the present invention. The LED lamps are driven by electric energy with dimmable brightness, and the electric energy is obtained from an external power supply 90B at the opposite front and then transmitted to a light-emitting load 50B at the opposite rear. The external power supply 90B is preferably 200-240V alternating current.

In this preferred embodiment, the light-emitting load 50B is implemented with a multi-color LED light group. That is to say, the light-emitting load 50B further includes a cool white temperature LED lamp group 51B and a warm white temperature LED lamp group 52B. The linear thyristor dimming lamp of this preferred embodiment further includes a chromaticity switch unit 60B connected to the light-emitting load composed of the cool white temperature LED lamp group 51B and the warm white temperature LED lamp group 52B 50B front end.

Different from the second embodiment, the chrominance switch 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 powered and controlled by the sub-power supply module 64B. The switch module 61B is connected to the input end of the sub-controller 62B, and the output module 63B is connected to the output end of the sub-controller 62B. The output module 63B is further connected between the anti-flicker control unit 40B and the light-emitting load 50B.

More, the switch module 61B is implemented as a common low-voltage conduction type DIP switch. The sub-controller 62B is a programmable microcontroller.

In this preferred embodiment, a sub-circuit combined with the switch module 61B and the sub-controller 62B is designed to realize the LED color temperature selection function. Specifically, the sub-controller 62B is preset with a certain program. Several preset working pins (Sa, Sb, Sc, Sd) corresponding to different color temperature functional gears on the switch module 61B of the chromaticity switch unit 60B are respectively corresponding to the sub-controller 62B. The functional pins (TEST, RST, P1.5) used for the command input signal and the peripheral circuit ground terminal GND are electrically connected accordingly, and the functional pins P1.2 and P1.7 in the sub-controller 62B are used as The ports used for command output signals are respectively connected to the negative poles of the cool white temperature LED lamp group 51B and the warm white temperature LED lamp group 52B through the power switch tubes Q2 and Q3 respectively.

When a certain functional gear is on the switch module 61B, the corresponding two pins on the gear are in a connected state, and the corresponding one or two functional pins on the sub-controller 62B are used to instruct the input signal. When the pin is powered on and activated, the sub-controller 62B immediately executes the relevant instruction operation processing, and then outputs the instruction result signal through the function pins P1.2 and/or P1.7. The level signals on pins P1.2 and/or P1.7 are amplified by the power switches Q2 and/or Q3, and finally output to the negative pole (W- terminal) of the warm white and warm LED light group 52B respectively. And/or the negative electrode (C-terminal) of the cool white temperature LED light group 51B.

When the corresponding LED warm white light function gear on the switch module 61B is selected, the corresponding Sa and Sb pins on the S1 gear are in a connected state, and the TEST and RST functions of the corresponding input signal terminals on the sub-controller 62B The pin is energized and activated, after the instruction operation processing of the sub-controller 62B, the function pin P 1.2 outputs the corresponding level signal, and then the corresponding signal amplification processing is performed through the power switch tube Q2, and finally output to the warm The negative electrode (W-terminal) of the white temperature LED lamp group 52B, at this time, the warm white temperature LED lamp group 52B is turned on to work.

The linear thyristor dimming lamp can take into account the performance of linear adjustment rate, surge and overvoltage protection, short-circuit protection and other aspects without adding additional electronic components, and is suitable for driving multi-chromaticity dimming It is practical for the dimming requirements of cool white temperature LEDs and warm white temperature LEDs, and it can achieve the actual effect of eliminating stroboscopic and low ripple. It uses a small number of electronic components to ensure that the manufacturing cost is not high. Increase.

The specific identifications of the linear thyristor dimming lamps in this preferred embodiment are: fuse resistors FR1, FR2, FR3, bridge stack BD1, high-voltage linear constant current control chip U1, anti-flicker control chip Q1, diode D0, D1, D2, D3, rectifier diode ZD1, ZD2, bidirectional trigger diode ZD3, chip resistor R1, R2, R2, R3..., chip capacitor C0, C1, C2..., varistor M1, electrolytic capacitor EC1, EC2, power switch tube (MOS tube) Q2, Q3, ordinary type DIP switch (ordinary 12V/50V low-voltage conduction type DIP switch) S1, ultra-low power consumption belt 16 based on reduced instruction set (RISC) architecture Bit bus programmable microcontroller (MCU) U2.

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

管脚号pin number	管脚名称pin name	描述describe
11	DVCCDVCC	MCU工作电压输入端引脚MCU working voltage input pin
22	P1.2P1.2	P1.2信号寻址引脚P1.2 signal addressing pin
33	P1.5P1.5	P1.5信号寻址引脚P1.5 signal addressing pin
44	P1.6P1.6	P1.6信号寻址引脚(此处为空置备用)P1.6 signal addressing pin (here is vacant for spare)
55	P1.7P1.7	P1.7信号寻址引脚P1.7 signal addressing pin
66	RSTRST	MCU重启动功能引脚MCU restart function pin
77	TESTTEST	MCU通电检测功能引脚MCU power-on detection function pin
88	DVSSDVSS	MCU接地端引脚MCU ground pin

It should be understood by those skilled in the art that the embodiments of the present invention shown in the above description and the accompanying drawings are only examples and do not limit the present invention. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may be modified or modified in any way without departing from the principles.

Claims

A linear thyristor dimming lamp, characterized in that it includes:

a rectifier unit for accessing an external power source to obtain electrical energy;

a dimming control unit, the input end of which is connected to the rectification unit for controlling the obtained rectified electric energy;

a filtering unit, and an anti-flicker control unit, wherein the filter unit and the anti-flicker control unit are respectively connected to the output end of the dimming control unit, so that after the rectification unit, the dimming control unit The electric energy of the light control unit, the filter unit and the de-strobe control unit is driven by a constant current to drive a light-emitting load, wherein the dimming control unit performs overvoltage protection at the input end and the output end at the same time. is connected, wherein the dimming control unit drives the light-emitting load of the rear end linearly and constant current according to the input terminal, so that the light-emitting load is supplied with energy without fluctuation.
The SCR dimming lamp according to claim 1, wherein the dimming control unit further comprises a controller and at least two protection modules, wherein at least two of the protection modules are respectively connected to the controller The input terminal and the output terminal, wherein each of the protection modules is set with different overvoltage protection thresholds.
The thyristor dimming lamp of claim 1, wherein 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 The input end of the controller, one of the protection modules is connected to the output end of the controller, wherein each of the protection modules is set with different overvoltage protection thresholds.
The linear thyristor dimming lamp according to claim 2 or 3, wherein the filtering unit is disposed at the output end of the protection module at the rear end of the dimming control unit.
The SCR dimming lamp according to claim 4, wherein the anti-flicker control unit is placed at the output end of the filter unit.
The linear thyristor dimming lamp according to claim 2 or 3, wherein the rectifying unit is disposed at the input end of the protection module at the front end of the dimming control unit.
The linear thyristor dimming lamp according to claim 2, wherein the rectifying unit is disposed at the output end of the protection module at the front end of the dimming control unit.
The linear thyristor dimming lamp according to claim 3, wherein the rectifying unit is placed between the two protection modules at the front end of the dimming control unit.
The linear thyristor dimming lamp according to claim 2 or 3, wherein the controller is a high-voltage linear constant current dimming control chip, wherein the output end of the controller is connected to the protection module, the filter unit and the de-stroboscopic control unit, wherein the negative pole of the light-emitting load is connected to the output of the de-stroboscopic unit.
The linear thyristor dimming lamp according to claim 9, wherein the rectifying unit further comprises a bridge stack, wherein the filtering unit further comprises at least one electrolytic capacitor, wherein the anti-flicker control unit further comprises a Strobe control chip.
The thyristor dimming lamp of claim 10, wherein the light-emitting load is implemented as an LED light group consisting of a plurality of LED lights.
The linear thyristor dimming lamp according to claim 11, wherein the light-emitting load adopts an LED lamp group consisting of a cool white temperature LED and a warm white temperature LED.
The thyristor dimming lamp of claim 12, wherein the thyristor dimming lamp further comprises a chromaticity switch unit connected to the LED lamp composed of cool white temperature LEDs and warm white temperature LEDs front of the group.
The linear thyristor dimming lamp according to claim 12, wherein the chromaticity switch unit is implemented as a multi-stage gear type dip switch or a combined type dip switch.
The linear thyristor dimming lamp according to claim 12, wherein the chromaticity switch unit further comprises: a switch module, a sub-controller, an output module and a sub-power supply module, wherein the sub-controller is controlled by The sub-power supply module is powered for control, wherein the switch module is connected to the input end of the sub-controller, wherein the output module is connected to the output end of the sub-controller, wherein the output module is further It is connected to the ground between the de-strobe control unit and the light-emitting load.
The linear thyristor dimming lamp according to claim 15, wherein the switch module is implemented as a common low-voltage conduction type dip switch, and wherein the sub-controller is a programmable single-chip microcomputer.
A driving method for a linear thyristor dimming lamp, comprising the following steps:

According to the input value, the electric energy input to a lighting load is controlled by a dimming control unit with constant current;

If the input value is higher than a first threshold value, the input terminal of the dimming control unit is activated for overvoltage protection;

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

Electric energy is supplied to the light-emitting load in a constant current manner.
15. The thyristor dimming light fixture of claim 14, wherein the first threshold is less than the second threshold.
The thyristor dimming lamp of claim 14, wherein the dimming control unit further comprises a controller and at least two protection modules, wherein at least two of the protection modules are respectively connected to the controller The input terminal and the output terminal, wherein each of the protection modules is set with different overvoltage protection thresholds.
The linear thyristor dimming lamp according to claim 16, wherein the driving method further comprises the step of: before the rectification, if the input value is higher than a third threshold, the input terminal of the dimming control unit is activated Overvoltage protection.
21. The thyristor dimming lamp of claim 20, wherein the third threshold is less than the first threshold.