TWI649007B - Sequencing method for light-emitting diode lamp string - Google Patents

Abstract

A method for sequencing a light-emitting diode lamp string is applied to a light-emitting diode light string, the light-emitting diode light string comprising a plurality of light-emitting diode units connected in series with each other, the light-emitting diode units being in each other After series connection, having different parasitic capacitance and resistance-capacitance time constant, the LED sequence sequencing method includes the following steps: transmitting a bit pulse signal to the LED units; when the address pulse When one of the signals drops, a clamp voltage is transmitted to the light emitting diode units; in a receiving state, the light emitting diode unit detects a receiving voltage of the light emitting diode unit; detecting the receiving The light-emitting diode unit stores the address pulse signal to have an address sequence data due to a voltage exceeding the target voltage that is less than a predetermined voltage.

Description

Light-emitting diode lamp string sequencing method

The invention relates to a sequencing method, in particular to a method for sequencing a light-emitting diode lamp string.

Light-emitting diodes are widely used to replace fluorescent lamps or light bulbs; for example, light-emitting diode strings containing a plurality of light-emitting diodes are used to decorate buildings or celebrate. In order to drive the light-emitting diodes of the light-emitting diode string to emit light in a variety of ways, the light-emitting diodes have different address sequence data. The light-emitting diodes receive a light-emitting signal including a light-emitting data and an address data; if the address sequence data of the light-emitting diode is the same as the address data of the light-emitting signal, the light-emitting diode Illuminating the illuminating data according to the illuminating signal; if the address sequence data of the illuminating diode is different from the address data of the illuminating signal, the illuminating diode skips the illuminating data of the illuminating signal.

At present, the sequencing methods of the light-emitting diodes of the LED array are mostly complicated or difficult; for example, before the LEDs are combined into the LED string, the illuminations are Each of the diodes is programmed into a different address sequence data; after that, the light emitting diodes are sequentially placed and combined into the light emitting diode string according to the address sequence data; if the light emitting diodes Since the polar bodies are not sequentially placed in accordance with the address sequence data, the diversified luminescence of the light-emitting diodes cannot be correctly achieved.

In order to improve the above disadvantages of the prior art, it is an object of the present invention to provide a method for sequencing a light-emitting diode.

In order to achieve the above object of the present invention, the light emitting diode lamp string sequencing method of the present invention is applied to a light emitting diode light string, and the light emitting diode light string comprises a plurality of light emitting diode units connected in series with each other. The LED units have different parasitic capacitance and resistance-capacitance time constants after being connected in series with each other. The LED sequence sequencing method includes: transmitting an address pulse signal to the LED units. Transmitting a clamp voltage to the light emitting diode units when a voltage of one of the address pulse signals drops; detecting the one of the light emitting diode units in a receiving state a voltage; and detecting that the received voltage is less than a predetermined voltage due to an over-target phenomenon, the LED unit stores the address pulse signal to have address sequence data.

The effect of the invention is to simply perform the sequencing of the light-emitting diode units of the light-emitting diode string.

In order to further understand the technology, the means and the effect of the present invention in order to achieve the intended purpose, refer to the following detailed description of the invention and the accompanying drawings. The detailed description is to be understood as illustrative and not restrictive.

In the present disclosure, numerous specific details are provided to provide a thorough understanding of the specific embodiments of the present invention; however, those skilled in the art will recognize that, without one or more of the specific details The invention may be practiced; in other instances, well-known details are not shown or described in order to avoid obscuring the invention. The technical content and detailed description of the present invention are as follows:

Please refer to FIG. 1, which is a block diagram of an embodiment of a method for sequencing a light-emitting diode lamp string to which the present invention is applied. The LED light sequence sequencing method of the present invention is applied to a light emitting diode string 10, a light emitting diode driving device 20 and a DC voltage supply device 30; the LED string 10 includes a plurality of LED units 102 connected in series with each other; the LED driving device 20 includes a control unit 202, a switching unit 204, a signal voltage generating circuit 218, and a switching element 210; the LED units Each of the 102 includes a bypass subunit 104, a voltage detection subunit 106, a memory 108, a control subunit 110, and a light emitting diode subunit 112. The signal voltage generating circuit 218 includes a resistive capacitor circuit 206. And a clamp voltage generating circuit 208; the resistor-capacitor circuit 206 includes a resistor 212 and a capacitor 214; the clamp voltage generating circuit 208 includes a Zener diode 216; the LED sub-unit 112 includes At least one light-emitting diode 114; the switching element 210 can be, for example, but the invention is not limited to a diode; the above-mentioned elements are electrically connected to each other.

After the above components are arranged as shown in FIG. 1, the inventors of the present invention separately measure the parasitic capacitive reactance of each of the light emitting diode units 102 by using a sophisticated instrument. The inventors of the present invention have found that the light-emitting diode units 102 have different parasitic capacitances after being connected in series to each other; in FIG. 1, the parasitic capacitance of the first one of the light-emitting diode units 102 from the left to the right is less than The second and right second parasitic capacitance of the LED unit 102; the left and right second of the LED unit 102 have a parasitic capacitance smaller than the third to the right of the LED unit Parasitic capacitance of 102, and so on. Therefore, the light-emitting diode units 102 have different resistance-capacitance time constants after being connected in series to each other; in FIG. 1, the resistance of the first one of the light-emitting diode units 102 from left to right The capacitance time constant is smaller than the resistance-capacitance time constant of the second left-right second light-emitting diode unit 102; the second and the second second light-emitting diode unit 102 have a resistance-capacitance time constant less than the left and right third The resistance-capacitance time constant of the light-emitting diode unit 102, and so on.

Please refer to FIG. 2 , which is a flow chart of an embodiment of a method for sequencing a light-emitting diode lamp string according to the present invention; and please refer to FIG. 1 at the same time. The method for sequencing a light-emitting diode lamp string of the present invention basically comprises the following five steps:

Step S02: transmitting a bit pulse signal to the light emitting diode units 102. Next, the light emitting diode lamp string sequencing method of the present invention proceeds to step S04.

Step S04: When a voltage of one of the address pulse signals drops, a clamp voltage is transmitted to the light emitting diode units 102. The clamping voltage is transmitted to the LED unit 102 through the switching element 210. Since any electronic component is delayed when the signal passes, the step S04 is when the address pulse signal is When the voltage drops, the clamp voltage is delayed to be transmitted to the light emitting diode units 102. Next, the light emitting diode lamp string sequencing method of the present invention proceeds to step S06.

Step S06: The LED unit 102 detects the receiving voltage of one of the LED units 102 in a receiving state. Next, the light emitting diode lamp string sequencing method of the present invention proceeds to step S08.

Step S08: The LED unit 102 detects that the received voltage is less than a predetermined voltage and stores the address pulse signal to have address sequence data. More specifically, the LED unit 102 that detects that the received voltage is less than the preset voltage due to an overshoot phenomenon stores the address pulse signal to have the address sequence data. Next, the light emitting diode lamp string sequencing method of the present invention proceeds to step S10.

Step S10: The LED unit 102 having the address sequence data enters a bypass state to bypass the address pulse signal.

As described above, the spurious capacitive reactance and the resistance-capacitance time constant of the light-emitting diode unit 102 that receives the address pulse signal first in the receiving state are minimized.

The following steps will detail the above steps:

The DC voltage supply device 30 transmits the DC voltage 302 to the LED driver 20; the control unit 202 utilizes the opening and closing of the switch unit 204 to control the DC voltage 302 received by the switch unit 204 to generate the bit. The address pulse signal transmits the address pulse signal to the light emitting diode units 102. When the control unit 202 turns on the switch unit 204, the DC voltage 302 passes through the switch unit 204 without entering the resistor-capacitor circuit 206, the clamp voltage generating circuit 208, and the switching element 210; when the control unit 202 is not conducting When the switching unit 204 (in this case, when the voltage of the address pulse signal drops as described above), the DC voltage 302 does not pass through the switching unit 204 but enters the resistor-capacitor circuit 206 and the clamp voltage generating circuit. 208. The clamp voltage generating circuit 208 then generates the clamping voltage and delays a delay time through the switching element 210 to transmit the clamping voltage to the LED units 102. As described above, since any electronic component is delayed in transmission when the signal passes, the delay time is naturally generated when the clamp voltage is transmitted to the light-emitting diode units 102 through the switching element 210.

That is, the switching element 210 delays the clamping voltage generating circuit 208 to generate and transmit the clamping voltage to the light emitting diode units 102. In other words, when the control unit 202 does not turn on the switch unit 204, the DC voltage 302 is transmitted to the resistor-capacitor circuit 206, the clamp voltage generating circuit 208, and the switching element 210, so that the switching element 210 delays the clamping voltage. The generating circuit 208 generates and transmits the clamping voltage to the LED units 102; when the control unit 202 turns on the switching unit 204, stops transmitting the DC voltage to the resistor-capacitor circuit 206, the clamping voltage generating circuit 208 and the switching element 210. The reason for generating and transmitting the clamp voltage to the LED units 102 is that the voltage drop of the address pulse signal causes the voltage of the LED string 10 to drop, but the LED lamp The voltage of the string 10 cannot be zero, so it is necessary to generate and transmit the clamp voltage to the light-emitting diode units 102.

Please refer to FIG. 3 , which is a waveform diagram of an embodiment of the address pulse signal received by the LED unit of the present invention; and FIG. 1 is also referred to. In FIG. 3, the first waveform from top to bottom is the waveform of the address pulse signal received by the first left and right of the LED unit 102 in FIG. 1, from top to bottom. The two waveforms are the waveforms of the address pulse signals received by the second left and right second LED units 102 in FIG. 1, and the third waveform from top to bottom is further in FIG. The waveform of the address pulse signal received by the subsequent LED unit 102 (for example, the last LED unit 102). It should be noted that FIG. 3 is only a schematic diagram for convenience of explanation. In fact, the received pulse signal of the address is extremely fast from the bottom and the width thereof is extremely narrow; if the delay time delayed by the switching element 210 is shorter, The faster the above speed will be and the narrower the width will be. Even if the width is extremely narrow, since the clamping voltage is delayed to the light-emitting diode units 102, the width (or the pull-down voltage) can be easily recognized without being too fast. Identification.

Theoretically, according to the opening and closing of the switching unit 204 and the clamping voltage generating circuit 208, the waveform of the address pulse signal should ideally be between the DC voltage 302 and the clamping voltage; however, The switching unit 204 rapidly switches between on and off (the period is between tens of nanoseconds and hundreds of nanoseconds), so the overshoot is generated when the waveform of the pulse signal of the address is pulled down. phenomenon. The resistance-capacitance time constants of each of the light-emitting diode units 102 are different after being connected in series with each other. As described above, the first one of the light-emitting diode units 102 from the left and the right has the smallest resistance-capacitance time constant. While the resistance-capacitance time constant is related to the charging discharge, the present invention utilizes this characteristic, as well as the above-mentioned over-target phenomenon, and the switching element 210 delays the generation and transmission of the clamping voltage to the light-emitting diode units 102. delay. More specifically, the address pulse signal received by the first light-emitting diode unit 102 in the receiving state is reduced to be smaller than the preset voltage, and the present invention detects this. A phenomenon (ie, detecting less than the predetermined voltage) and utilizing this phenomenon can set the LED unit 102 that is closest to the switching unit 204 and in the receiving state. Under suitable design, the present invention can achieve that only the address pulse signal received by the LED unit 102 closest to the switch unit 204 and received in the receiving state will be smaller than the preset voltage.

The voltage detecting subunit 106 of each of the light emitting diode units 102 in the receiving state respectively detects the receiving voltage of each of the light emitting diode units 102, and thus the left and right sides The voltage detecting sub-unit 106 of the LED unit 102 can detect that the address pulse signal is smaller than the preset voltage, and then use the left and right first LED unit 102. The memory 108 stores the address pulse signal to have the address sequence data. Then, the first left-to-right LED unit 102 utilizes (ie, turns on) the bypass sub-unit to enter the bypass state to bypass the subsequent new address pulse signal. The control sub-unit 110 of the LED unit 102 also turns off the voltage detection sub-unit 106, so that the voltage detection sub-unit 106 no longer detects the reception voltage.

Then, the control unit 202 uses the switching unit 204 and the DC voltage 302 to form a new address sequence data; at this time, the first LED unit 102 enters the bypass state by the left and right ( Similar to the short circuit), the waveform of the address pulse signal received by the second left and right second LED unit 102 will be the first waveform from top to bottom in FIG. 3, from left to right. The waveform of the address pulse signal received by the three LED units 102 will be the second waveform from top to bottom in FIG. 3, and so on. As the number of the light-emitting diode units 102 that have been sequenced increases, the number of the bypass sub-units 104 that are turned on will also increase, and the parasitic capacitive reactance will also gradually decrease. Therefore, the present invention The subsequent new address pulse signal can be designed and adjusted to achieve that only the address pulse signal received by the LED unit 102 closest to the switch unit 204 and received in the receiving state will be smaller than the address pulse signal. The preset voltage; or, the present invention is added with a sufficiently long wire, the above phenomenon still exists.

The control unit 202 knows the number of the LED units 102; after the sequencing of the LED units 102 is completed, the system is turned back on, so that the bypass sub-units 104 are all non-conducting. Then, the control unit 202 uses the switch unit 204 and the DC voltage 302 to form a light-emitting signal including a light-emitting data and an address data for transmission to the light-emitting diode units 102; if the control sub-unit 110 determines the The address sequence data of the LED unit 102 is the same as the address data of the illuminating signal, and the control sub-unit 110 controls the illuminating diode sub-unit 112 to emit light according to the illuminating data of the illuminating signal; The control sub-unit 110 determines that the address sequence data of the LED unit 102 is different from the address data of the illumination signal, and the control sub-unit 110 skips the illumination data of the illumination signal.

The effect of the present invention is to simply perform the sequencing of the light-emitting diode units 102 of the light-emitting diode string 10.

However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect. The invention may be embodied in various other modifications and changes without departing from the spirit and scope of the inventions. It is intended to fall within the scope of the appended claims. In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.

10‧‧‧Lighting diode string

20‧‧‧Lighting diode drive

30‧‧‧DC voltage supply device

102‧‧‧Lighting diode unit

104‧‧‧Bypass subunit

106‧‧‧Voltage detection subunit

108‧‧‧ memory

110‧‧‧Control subunit

112‧‧‧Lighting diode subunit

114‧‧‧Lighting diode

202‧‧‧Control unit

204‧‧‧Switch unit

206‧‧‧resistive capacitor circuit

208‧‧‧Clamp voltage generation circuit

210‧‧‧Switching elements

212‧‧‧resistance

214‧‧‧ Capacitance

216‧‧ ‧ Zener diode

218‧‧‧Signal voltage generation circuit

302‧‧‧DC voltage

S02‧‧‧Steps

S04‧‧‧Steps

S06‧‧‧Steps

S08‧‧‧Steps

S10‧‧‧ steps

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing an embodiment of a method for sequencing a light-emitting diode lamp string to which the present invention is applied.

2 is a flow chart of an embodiment of a method for sequencing a light-emitting diode lamp string according to the present invention.

3 is a waveform diagram of an embodiment of the address pulse signal received by the LED unit of the present invention.

Claims (10)

A method for sequencing a light-emitting diode lamp string is applied to a light-emitting diode light string, the light-emitting diode light string comprising a plurality of light-emitting diode units connected in series with each other, the light-emitting diode units being in each other After series connection, having different parasitic capacitance and resistance-capacitance time constant, the LED sequence sequencing method comprises: a. transmitting a bit pulse signal to the light-emitting diode units; b. when the address When one of the pulse signals drops, a clamp voltage is transmitted to the light emitting diode units; c. the light emitting diode unit detects a receiving voltage of the light emitting diode unit in a receiving state; and d. detecting that the receiving voltage is less than a predetermined voltage due to an over-target phenomenon, the LED unit stores the address pulse signal to have address sequence data. The method for sequencing a light-emitting diode according to claim 1, further comprising: e. the light-emitting diode unit having the address sequence data enters a bypass state to bypass the Address pulse signal. The method according to claim 2, wherein the light emitting diode unit comprises a bypass subunit; wherein in step e, the light emitting diode unit enters the bypass state The bypass subunit is utilized to bypass the address pulse signal. The method of claim 2, wherein in step b, a clamp voltage generating circuit generates and transmits the clamp voltage to the light emitting diode units. The method according to claim 4, wherein in the step a, a control unit uses a switch unit to open and close to control a DC voltage received by the switch unit to generate the DC voltage. The address pulse signal transmits the address pulse signal to the light emitting diode units. The method according to claim 5, wherein in the step b, when the control unit does not turn on the switching unit, the DC voltage is transmitted to a switching element and the clamping voltage. And generating a circuit, wherein the switching element delays the clamping voltage generating circuit to generate and transmit the clamping voltage to the light emitting diode units. The method of claim 2, wherein in the step b, when the control unit turns on the switch unit, stopping transmitting the DC voltage to the switching element and the clamping voltage Generate a circuit. The method of claim 2, wherein the clamping voltage generating circuit comprises a Zener diode; the switching element is a diode. The method of claim 2, wherein the LED unit comprises a voltage detecting subunit to detect the receiving voltage of the LED unit. The method for sequencing a light-emitting diode according to claim 1, wherein the light-emitting diode unit comprises a memory; wherein in step d, the light-emitting diode unit uses the memory to store The address pulse signal has the order data.