TWI576006B - Light emitting diode controller and method thereof - Google Patents

Description

Light-emitting diode controller and method thereof

The invention relates to a controller for driving a light-emitting diode lamp and a control method thereof.

In today's era of high environmental awareness, energy development and consumption have been paid more attention. In order to prolong the activity time of human activities and increase the working environment, lighting equipment is indispensable in daily life. At present, the common lighting uses bulbs or tubes as the main light source, but these devices have their shortcomings even after many improvements, among which the bulbs Tungsten wire emits light, the photoelectric conversion efficiency is low, and most of the energy is consumed in heat energy. Therefore, the power consumption is high, the reaction is slow or easy to be damaged, and in the lamp tube, in order to cause electrons to collide with each other to generate light, it is necessary to fill the mercury gas, but the mercury is applied to the environment. The pollution is well known and is not suitable for discussion on environmental issues. In place of the mainstream technology of light bulbs or tubes, Light-Emitting Diode (LED) has the highest voice, and it uses electrons to move light in the energy level of semiconductor materials to produce light. It has low power consumption and high efficiency. Unlike conventional light bulbs that emit light from filaments, they have a long service life and are not easily damaged, or mercury-filled gases cause significant pollution to the environment. The widespread use of light-emitting diodes to replace traditional lamps is just around the corner.

At present, most of the lampholder specifications are uniformly formulated by most manufacturers. In order to make the LEDs do not need to be replaced by the user, the development of the LEDs is mainly in accordance with the specifications of the lamp holders, and most of the LEDs will be The body is arranged in series or in parallel on the lamp holder to form a lamp. In addition, according to the purpose and environment of each manufacturer, the number of LED strings or parallel connections in each lamp is inconsistent. For example, at present, a rated voltage of a light-emitting diode is about 3~4 volts. The manufacturer may connect a plurality of light-emitting diodes in series or in parallel to form a lamp, or the lamps can be connected in series. Or parallel to make it suitable for the rated voltage of 110 volts in the home. In this way, the voltage required for each manufacturer to produce the lamp is different, so that the lamps formed by different styles or different numbers of LEDs have different voltages. If the user wants to use different lamps at the same time, various lamps are needed. The power supply, if the power supply is improperly applied, may cause the lamp to burn out or the brightness of the lighting is insufficient. At this time, therefore, it is necessary to carry power supplies of different needs separately, which is a great burden for users who use the lamps at different locations or at any time.

In order to solve the above problems, in the prior art, a lamp is provided, and a light bar is disposed. The light bar includes a plurality of light emitting diodes, and the lamp comprises: a driving module, a casing, a lamp cover and a lamp holder. The driving module includes a driving unit and a specification identifying unit. The driving unit provides an electronic environment with specific electronic characteristics to the light bar corresponding to a specification data obtained by the specification identifying unit, so that the light bar emits light. The light bar is disposed between the casing and the lamp cover, and is electrically connected to the driving module via the lamp socket. The specification data is obtained by the specification identifying unit from the light bar. Obtaining a specification data stored in the specification storage unit of the light bar by the specification identification unit disposed in the lamp to identify the electronic characteristics of the light bar and/or the light element therein, thereby providing the illumination lamp The electronic environment of the electronic characteristics used in the strip causes the light strip to illuminate. However, this method relies on the specification identification unit to identify lamps of different specifications, and an additional specification storage unit is required, resulting in additional power consumption or lamp space.

Another conventional technology is a light-emitting diode control circuit, which is suitable for controlling a light-emitting diode lamp. The light-emitting diode lamp comprises a plurality of light-emitting diode lamp strings, wherein the light-emitting diode lamp is compared. Preferably, the maximum input voltage does not exceed 70 volts and the number of strings of the LED strings is preferably limited to 4 strings. The LED control circuit includes a plurality of diodes, a protection circuit, a plurality of constant current circuits, and a switch. The anode of each diode is connected to the output of a single light-emitting diode string. a protection circuit is connected to the negative pole of each of the diodes, and when the voltage of the input terminal of the LED is higher than a critical value or a light-emitting diode is short-circuited in the LED lamp The protection circuit outputs a switching signal. Each constant current circuit is connected to an output end of the single light emitting diode string, and controls whether the constant current circuit works according to a switch control signal to thereby control whether the light emitting diode lamp operates, and is controlled according to a dimming control signal The brightness of the light-emitting diode tube. The switch does not affect the switch control signal when the switch signal is not received, and controls the light-emitting diode lamp to be inoperative by the switch control signal when receiving the switch signal. The above method utilizes a constant current circuit to enable each of the LED strings to operate and control the brightness, but the method is to prevent the voltage from being excessively damaged, and the maximum voltage of the lamp string is not more than 70 volts, so that Users need more strings and use more than 70 volts. This method is not feasible.

In summary, when a user needs a different size of the LED lamp, it is necessary to carry a plurality of driving devices suitable for various rated voltages to drive the lamps, which is extremely inconvenient and uneconomical for the user.

The main object of the present invention is to provide a light-emitting diode controller and a method thereof. With the driving device, a user only needs one power supply to drive a light-emitting diode lamp with different rated voltages.

A secondary object of the present invention is to provide a light emitting diode controller and a method thereof, which can automatically detect the operating voltages of the light emitting diodes so that the driving voltage is suitable for the operating point of the light emitting diode.

When the user wants to use the light-emitting diode lamps of different rated voltages, the light-emitting diode lamps can be driven only by coupling the driving device between the power supply and the light-emitting diode lamps.

In order to achieve the above-mentioned various purposes and effects, the present invention discloses a light-emitting diode controller and a method thereof. When the number of series connection of the light-emitting diodes is unknown, the user only needs to couple the present invention between the power supplies. The controller can provide a driving voltage, the driving voltage is gradually increased, and automatically detects the total current of each of the driving diodes after the amplification of the driving voltage, using each increasing driving voltage and each time The total current detected is used to calculate the working voltage of all the light-emitting diodes. After determining the working voltage, the controller stops increasing the driving voltage, so that the back-end LED does not cause the driving voltage to be excessively damaged. In addition, the controller of the present invention has a plurality of output ports or can manually switch the light-emitting diode lamps with different rated voltages. When the light-emitting diode lamps with different rated voltages are to be used, the user couples the light-emitting diodes. The light-emitting diodes with the rated voltages in the same range are coupled to the same output port, and the light-emitting diodes are prevented from being damaged due to excessive driving voltage, or the driving voltage is too low and the brightness is insufficient.

In an embodiment, the LED controller includes: a control unit having a voltage input terminal and a voltage output terminal, wherein the voltage output terminal outputs a driving voltage to supply a plurality of LEDs; and The detecting unit detects a total current of the one of the light emitting diodes; wherein the control unit adjusts the driving voltage according to the total current.

In another preferred embodiment of the present invention, the control unit of the LED controller further includes an arithmetic circuit for calculating a slope of the driving voltage and the total current.

In another preferred embodiment of the present invention, the control unit of the LED controller further includes a driving circuit for gradually increasing the driving voltage.

In another preferred embodiment of the invention, the light emitting diode systems are adapted to the same voltage rating.

In an embodiment of the present invention, the LED control method includes: generating a driving voltage to supply a plurality of LEDs; gradually increasing the driving voltage to detect the LEDs after each amplification The total current of one of the bodies; calculating the slope of the driving voltage and the total current for each increment; and determining the slope to determine whether to continue the amplification.

10‧‧‧Lighting diode controller

100‧‧‧Control unit

101‧‧‧Operating circuit

102‧‧‧ drive circuit

200‧‧‧Detection unit

D‧‧‧Lighting diode

The first figure is a schematic diagram of a light-emitting diode controller according to a preferred embodiment of the present invention; the second figure is a characteristic curve of the forward bias of the light-emitting diode; the third figure: A flow chart of a light-emitting diode controller according to another preferred embodiment of the present invention; FIG. 4 is a schematic diagram of a light-emitting diode controller according to another preferred embodiment of the present invention; A schematic diagram of the calculated slope of the inventive operational circuit; sixth diagram: which is a schematic diagram of another embodiment of the present invention.

For a better understanding and understanding of the features and advantages of the present invention, the preferred embodiments and the detailed description are given as follows: Referring to the first figure, which is the present invention A schematic diagram of a light emitting diode controller of a preferred embodiment. As shown in the figure, the LED controller 10 of the present invention comprises: a control unit 100; and a detecting unit 200.

The controller 10 of the LED of the present invention has a control unit 100 having a voltage input terminal Vi coupled to the power supply, and a voltage output terminal Vo outputting a driving voltage for supplying a plurality of illuminations. The diode D and a detecting unit 200 detect a total current of the light-emitting diodes D and supply the total current data to the control unit 100. The control unit 100 adjusts the driving voltage according to the total current.

Please refer to the second figure together, which is a characteristic curve of the forward bias of the light-emitting diode. As shown, the present invention is a light emitting diode controlling unit of the controller, based upon conventional operating a single light emitting diode, as shown in the curve C _1, having all the VCUT voltage, the driving voltage is less than the voltage VCUT cut, The light-emitting diode system is not in a conducting state, the operating current is very small, and approaches zero. However, when the driving voltage is greater than the cutting-in voltage Vcut, the light-emitting diode system is turned on, and the operating current rises rapidly. Similarly, most of the same light-emitting diodes can be connected in series. As shown by the curve C ₂ , when the number of series is larger, the cut-in voltage Vcut will be larger; most of the same light-emitting diodes are connected in parallel, and the more the number of parallel connections , the faster the speed of the operating current increases, as shown in the curve C _3; if the same series and in parallel to the light emitting diode while the cut Vcut voltage is increased while the operating current is also increased together.

The controller of the light emitting diode of the present invention comprises: a control unit 100, the control unit 100 can control a driving voltage, the driving voltage drives a plurality of LEDs D, and a detecting unit 200, the detecting The measuring unit 200 detects the total current of the LEDs D and transmits the total current signal back to the control unit 100. The control unit 100 adjusts the driving voltage according to the total current. The control unit 100 obtains the working voltages of all the LEDs D to be turned on by using the total current detected by the detecting unit 200, and controls the driving voltage to make the driving. The voltage is equal to the operating voltage.

With the above device and method, the power supply device can pass through the controller 10 of the light-emitting diode of the present invention, and when the output terminal is coupled to the LED diode D, the number of series or parallel connection is unknown, the controller can obtain all the light-emitting diodes. The operating voltage is turned on, and the driving voltage is controlled to be equal to the operating voltage, and no additional driving device suitable for the LEDs is required.

Please refer to the third figure, which is a flow chart of a controller for a light-emitting diode according to a preferred embodiment of the present invention. As shown in the figure, according to the foregoing LED controller 10, the steps are as follows. In step S10, the output of the control unit 100 generates a driving voltage; in step S20, the detecting unit 200 detects the total current of the light-emitting diodes D; in step S30, the control unit 100 amplifies the driving voltage; step S40: detecting The unit 200 detects the total current of the light-emitting diodes D; step S50: the control unit 100 calculates the slope of the driving voltage and the total current; step S60: determining the operating voltages of all the light-emitting diodes according to the slope; Step S70: If all of the light-emitting diodes are all turned on, a working signal is generated, so that the control unit 100 does not continue to increase the driving voltage.

Through the above method, one of the working voltages of the light-emitting diodes can be completely turned on, and the driving voltage is maintained at the operating voltage by the controller, so that the light-emitting diodes are not damaged due to excessive voltage.

Please refer to the fourth figure, which is a schematic diagram of a light-emitting diode controller according to another preferred embodiment of the present invention. As shown in the figure, the controller 10 of the light-emitting diode of the present invention further includes an arithmetic circuit 101 and a driving circuit 102. The operation circuit 101 has two input terminals, one end of which receives the driving voltage, and the other end receives the total current signal obtained by the detecting unit 200. The driving circuit 102 has an input end coupled to the power supply and an output end outputting the driving voltage. The driving circuit 102 gradually increases the driving voltage so that the driving voltage starts from an initial value and increases by one microvolt per time interval, and the microvolt value can be adjusted by the user, for example, the adjustable range is from 10 ^-5 mV to 10 ^-1 mV, when the resolution demand is larger, the driving voltage is increased by a small amount each time. When one input terminal of the arithmetic circuit 101 receives the driving voltage, the other input terminal can obtain a total current. When the driving voltage is increased by one microvolt each time, another total current is obtained. At this time, the arithmetic circuit 101 is based on the amplification. Driving voltage and total current and increasing driving voltage and total current, calculating the slope of voltage and current, through which the operating voltage of the currently used LED can be judged, and when the operating circuit 101 obtains the currently used LED D The operating voltage, that is, a working signal is transmitted to the driving circuit 102. When the driving circuit 102 receives the working signal, the driving circuit 102 stops continuing to increase the driving voltage, so that the driving voltage does not continue to increase, and the driving voltage is equal to the operating voltage.

With the above device and method, the power supply device passes through the controller 10 of the light-emitting diode of the present invention. When the number of the same light-emitting diodes coupled to the output terminal is unknown, the current required operating voltage can be obtained, and the driving voltage is increased. Some of the light-emitting diodes are in working condition.

Please refer to the fifth figure, which is a schematic diagram of the calculated slope of the arithmetic circuit of the present invention. As shown in the figure, the figure is a partial amplification of the characteristic curve C of the light-emitting diode, wherein the driving voltage of the driving circuit is Vn, Vn+1, Vn+2 and Vn+3, and the driving voltages Vn and Vn+1 are smaller than Vcut, the driving voltages Vn+2 and Vn+3 are greater than Vcut. When the driving voltage is Vn, there is a total current In. When the driving voltage is increased to Vn+1, there is another total current In+1. At this time, the operating circuit 101 is driven by the driving voltage Vn and the total current In, and the driving voltage Vn. +1 and the total current In+1, a slope S1 can be obtained, and the calculation formula is: When the driving voltage is increased to Vn+2, there is a total current In+2. At this time, the operating circuit 101 is driven by the driving voltage Vn+1 and the total current In+1, and the driving voltage Vn+2 and the total current In+2. A slope S2 can be obtained, and the formula is: When the driving voltage Vn+3 is derived in this way, the arithmetic circuit 101 can also obtain a total current In+3 and a slope S3. Therefore, when the driving voltage is gradually increased, the slope of the voltage and current on the LED is larger. When the driving voltage is equal to Vn or Vn+1, the LED may not be fully turned on, at the driving voltage Vn+. The slope S1 obtained by 1 is very small; when the driving voltage is Vn+2 or Vn+3, all of the light-emitting diodes may be fully turned on, and the slopes S2 and S3 obtained at the driving voltages Vn+2 and Vn+3 are very large. Note that the meaning of this is not fully conductive and may be all turned on. It means that although the LEDs of the same specifications are the same, there is still a slight difference in the cut-in voltage, for example, 10 ^-5 mV or even smaller, when the driving voltage is too high. The cut-in voltage of each of the light-emitting diodes is approached so that not all of the light-emitting diodes are not turned on or have turned on. The solution to this part can be solved by the resolution of the drive voltage increase, where the resolution is adjusted as described above. In addition, the operating voltage is determined by the slope, and the working signal is transmitted to the driving circuit, and the slope can be adjusted according to the user's needs. For example, the user only wants to operate the LEDs without giving a full rated voltage. , the smaller the slope value is set, but all the LEDs are operated. Otherwise, the slope value is set to be larger, but all the LEDs are not damaged.

Please refer to the sixth figure, which is a schematic diagram of another embodiment of the present invention. As shown in the figure, the controller and method of the LED of the present invention can also be applied to simultaneously drive lamps of different specifications, but the working voltages of different lamps are different, so that one of the lamps cannot be operated due to too small voltage. Or damaged due to excessive voltage. The controller and method of the LED of the present invention can have multiple output ports and simultaneously detect LEDs of different ranges of rated voltages. To use different sizes of LEDs, the user couples the lamps. The diodes are coupled to the same output 埠 at the respective output ports, so that the light-emitting diodes are prevented from being damaged due to excessive voltage, or the voltage is too low and the brightness is insufficient.

The controller of the present invention can manually switch its applicable lamp voltage range, for example, a range of 3 to 5 volts and a range of 20 to 23 volts.

The invention utilizes the working characteristics of the diode to complete a light-emitting diode controller and method. The light-emitting diode controller has a control unit output driving voltage, and a detecting unit detects one of the light-emitting diodes. The total current, the control unit calculates the operating voltage of the current light-emitting diode according to the total current, and maintains the driving voltage at the operating voltage. Through the controller of the light-emitting diode of the present invention, the user can drive various types of light-emitting diode lamps without carrying various types of driving devices, and the number of the light-emitting diodes can be stably operated in series and in parallel. The invention is a novelty, progressive and available for industrial use, and should meet the requirements of the patent application stipulated in the Patent Law of China, and the patent application is filed according to law, and the praying office grants the patent as soon as possible. prayer.

10‧‧‧Lighting diode controller

100‧‧‧Control unit

200‧‧‧Detection unit

D‧‧‧Lighting diode

Claims (11)

A control method for a light-emitting diode, the control method comprising: outputting a driving voltage to a plurality of light-emitting diodes; gradually increasing the driving voltage, and detecting one of the light-emitting diodes after the driving voltage is increased each time a total current; calculating a slope of the driving voltage and the total current for each amplification; and determining an operating voltage when the LEDs are all turned on according to the slope. The method for controlling a light-emitting diode according to claim 1, wherein the slope calculation is a ratio of a difference between the amplitude-increasing voltage and the total current. The method for controlling a light-emitting diode according to claim 1, wherein the amplification voltage ranges from 10 ^-5 mV to 10 ^-1 mV. The method for controlling a light-emitting diode according to claim 1, wherein the light-emitting diodes are applied to the same rated voltage. The method of controlling a light-emitting diode according to claim 1, wherein the light-emitting diodes are connected in series. The method of controlling a light-emitting diode according to claim 1, wherein the light-emitting diodes are connected in parallel. A controller for a light-emitting diode, the controller comprising: a control unit that outputs a driving voltage to supply a plurality of light-emitting diodes; and a detecting unit that detects a total current of the light-emitting diodes, The total current is returned to the control unit, wherein the control unit adjusts the driving voltage according to the total current, wherein the control unit further comprises an operation circuit, and calculates a slope of the driving voltage and the total current. The controller of the light-emitting diode according to claim 7, wherein the control unit further comprises a driving circuit for gradually increasing the driving voltage. The controller of the light-emitting diode according to claim 8, wherein the light-emitting diodes are applied to the same rated voltage. A controller for a light-emitting diode according to claim 8, wherein the light-emitting diodes The diodes are connected in series. The controller of the light-emitting diode according to claim 8, wherein the light-emitting diodes are connected in parallel.