TW202040545A - Control method for single-wire serially connected light-emitting diode driver circuit having processing module generating a function signal including M2 null commands that match the light-emitting instruction in format and a function instruction - Google Patents

Abstract

A control method for a single-wire serially connected light-emitting diode (LED) driver circuit, comprising the steps of: providing a light-emitting diode (LED) driver module including N LED units connected in series with each other in a single wire and a processing module. The LED unit respectively includes a LED and a signal processor; the processing module generates a light-emitting signal to the LED unit, the light-emitting signal has M1 light-emitting instructions; the processing module generates a function signal to the LED unit, the function signal includes M2 null instructions that match the light-emitting instruction in format and a function instruction that follows the null instruction and is in format different from the illuminated instruction; the signal processor acquires the function signal and then operates a non-illuminated function.

Description

A control method for single-line serial connection of light-emitting diode drive circuit

The present invention relates to a control method of light-emitting diodes, in particular to a control method for single-wire series connection of light-emitting diodes.

Light-emitting diodes have been mature and widely used in lighting, displays, decorative lights, etc. In order to optimize the efficiency of light-emitting diodes, in addition to considering the material design of the light-emitting diode itself, drive light emission The control circuit of the diode light also plays an important role.

The drive circuit architecture of light-emitting diodes is commonly configured as a single-line series-connected light-emitting diode. For conventional light-emitting diode devices, please refer to China Patent Publication No. CN205746094U, No. CN207394755U, No. CN202871258U, etc. . The aforementioned conventional single-wire series light emitting diodes only have light-emitting function. If other non-light-emitting functions are to be added, it is often necessary to make a certain degree of modification to the module of the drive circuit, which not only increases the cost but also increases the design complexity. Degree, it is necessary to improve.

The main purpose of the present invention is to solve the problem that the conventional single-wire series-connected light-emitting diode drive circuit only has a simple light-emitting function, which limits the flexibility and range of application.

In order to achieve the above-mentioned objective, the present invention is a control method for a single-wire serially connected light-emitting diode drive circuit, which includes the following steps:

A light-emitting diode drive module is provided, including N light-emitting diode units connected in series with each other in a single line, and a processing module, where N is an integer greater than 1, and the light-emitting diode units each include a light-emitting diode And a signal processor electrically connected to the light emitting diode;

The processing module generates a light emitting signal to the light emitting diode unit, the light emitting signal includes M1 light emitting commands corresponding to a display color, and M1 is an integer greater than 1;

After the signal processor obtains the light-emitting signal, the signal processor controls the light-emitting diode to emit the corresponding display color according to the obtained light-emitting instruction;

The processing module generates a function signal to the light-emitting diode unit. The function signal includes M2 blank commands in format that match the light-emitting command and a function after the blank command and different in format from the light-emitting command Instruction, M2 is an integer greater than 1; and

After the signal processor obtains the function signal, the signal processor operates a non-luminous function according to the function command.

Accordingly, the control method of the present invention deliberately adds to the signal a blank command whose format is compatible with the light-emitting command but does not trigger the light-emitting diode and the function command whose format is different from the light-emitting command, so that the signal can be processed After determining the existence of the functional command, the device executes the pre-written non-luminous function according to the functional command. It can provide advanced lighting other than lighting without changing the signal and/or command format and without significantly changing the circuit architecture. The function allows users and downstream manufacturers of light-emitting diodes to have a more flexible choice.

The detailed description and technical content of the present invention are described as follows in conjunction with the drawings:

The present invention is a control method for a single-wire series connection of a light-emitting diode drive circuit. Please refer to "Figure 1", which is an embodiment of the present invention, a light-emitting diode drive module 1 applying the control method. The circuit block diagram of the light emitting diode driving module 1 includes N light emitting diode units 10 connected in series with each other in a single line and a processing module 20, where N is an integer greater than 1, and the light emitting diode unit 10 Each includes a light-emitting diode 11 and a signal processor 12 electrically connected to the light-emitting diode 11. Each of the light emitting diode units 10 has a signal input interface 101 and a signal output interface 102. The signal input interface 101 and the signal output interface 102 are usually directly arranged on the signal processor 12, and for the convenience of description , Define N+1 reference points, and the reference points are sequentially arranged on both sides of the light-emitting diode unit 10, as shown in "Figure 1", N is 3, and the reference points are labeled D1, D2, D3 and D4.

The method of the present invention first provides the light-emitting diode drive module 1, and then the processing module 20 generates a light-emitting signal to the light-emitting diode unit 10, and the light-emitting signal includes M1 light-emitting commands corresponding to a display color. M1 is an integer greater than 1. After the signal processor 12 obtains the light-emitting signal, the signal processor 12 controls the light-emitting diode 11 to emit the corresponding display color according to the obtained light-emitting instruction; next, the processing mode The group 20 generates a function signal to the light-emitting diode unit 10, and the function signal includes M2 blank commands that match the lighting command in format and a function command that is after the blank command and differs from the lighting command in format. M2 is an integer greater than 1, and the signal processor 12 operates a non-luminous function according to the function command. In this embodiment, N=M1 and M2=M1+1, in other words, N is 3, M1 is 3, and M2 is 4.

Continuing to refer to "FIG. 2", it is a schematic block diagram of the circuit of the signal processor 12 according to an embodiment of the present invention. In this embodiment, the signal processor 12 includes a first storage unit 121, a second storage unit 122, A counting unit 123, a sensing unit 124, an oscillation unit 125 and a line switch 126. The first storage unit 121 is used for receiving and storing the light-emitting instruction. In this embodiment, the signal processor 12 of the i-th light-emitting diode unit 10 stores the i-th light-emitting instruction, wherein, i is an integer between 1 and N. The second storage unit 122 is used for receiving and storing the function command. In this embodiment, the counting unit 123 is used for calculating the number of bits of the light-emitting command, the empty command, and the function command, and the sensing unit 124 is The oscillating unit 125 is electrically connected, and the line switch 126 is used to determine whether the signal input interface 101 and the signal output interface 102 are connected.

In this embodiment, the signal processor 12 can transmit the light-emitting signal and the function signal in a bypass mode. Specifically, if N is 3, M1 is 3, and M2 is 4, when the first After the signal processor 12 of the light-emitting diode unit 10 receives the three light-emitting instructions, it will store the first light-emitting instruction, and transmit the other two light-emitting instructions backward to the second and third The light emitting diode unit 10.

Please refer to "Figure 3". The following is a further explanation through the signals received at different frames and/or times at the reference points D1, D2, D3 and D4 in "Figure 1". Corresponding to the circuits shown in "Figure 1" and "Figure 2", please refer to "Figure 1" and "Figure 2" for cooperation. N is 3, M1 is 3, and M2 is 4. The following first frame (1st frame) corresponds to the light-emitting diode unit 10 performing a light-emitting function, and the second frame (2nd frame) corresponds to performing the light-emitting function, the light-emitting diode unit 10 performs a non-light-emitting function Function, this embodiment uses the non-luminous function as a sleep mode for description.

First, in the first frame (1st frame), the processing module 20 generates a light-emitting signal. The light-emitting signal includes light-emitting commands S11, S12, and S13. The light-emitting commands S11, S12, and S13 respectively correspond to a display color, such as red, A mixture of green and blue or any one. In this embodiment, the display color is full color, and the bit length of the light-emitting commands S11, S12, and S13 is 24 bits.

The light-emitting signal received at the reference point D1 in the first frame includes three light-emitting commands S11, S12, and S13. The light-emitting commands S11, S12, and S13 will enter the first light-emitting diode unit 10 through the signal input interface 101. The counting unit 123 is used to count, and from the light-emitting signal of the first frame, the light-emitting signal with a length of 24 bits (ie, the light-emitting command S11) is taken out and stored in the first storage unit 121, and the other The luminous signal is output from the signal output interface 102 to the reference point D2 backward.

The light-emitting signal received at the reference point D2 in the first frame includes light-emitting commands S12 and S13, the light-emitting signal received at the reference point D3 in the first frame only includes the light-emitting command S13, and the second and third light-emitting diode units The operation of 10 is the same as before, but the reference point D4 will not receive the light-emitting instruction in the first frame. In this way, in the first frame, each of the light-emitting diode units 10 emits the corresponding display color according to the light-emitting signal. After a first interval of time T1 is the second frame (2nd frame), in this embodiment, the first interval of time T1 is not less than 200 microseconds (μs).

In the second frame (2nd frame), the processing module 20 generates a function signal. The function signal includes three blank commands S21, S22, and S23 that match the light-emitting commands S11, S12, and S13, and one format. Different from the function command PD of the light-emitting commands S21, S22, and S23, the function command PD follows the empty commands S21, S22, and S23. In this embodiment, the format of the light-emitting instructions S11, S12, S13 and the empty instructions S21, S22, S23 and the function instruction PD refer to the bit length. For example, the light-emitting commands S11, S12, and S13 have a first bit of 24 bits, the empty commands S21, S22, and S23 have a second bit of 24 bits, and the function command PD has a The third bit that is not 24 bits, such as 8 bits.

In this embodiment, the function command PD is a sleep command. After the signal processor 12 receives the dummy commands S21, S22, S23 and the subsequent function command PD, if it waits for a second interval T2, Upon receiving other instructions, the signal processor 12 will enter a sleep mode according to the function instruction PD, that is, the sleep time T3 in "FIG. 3", where the second interval time T2 is not less than 200 microseconds (μs). In the sleep mode, the signal processor 12 is in a power down state. In this embodiment, when the signal processor 12 is in the power down state, some components of the signal processor 12 will be turned off to reduce power. Consumption, for example, will turn off the oscillating unit 125.

After the sleep mode, if the signal processor 12 is to be awakened, the processing module 20 is asked to generate a wake-up pulse P to the signal processor 12, and the sensing unit 124 starts the oscillating unit after receiving the wake-up pulse P 125 and return to an operating mode, and the wake-up pulse P can be a rising edge.

The above uses the non-light-emitting function as the sleep mode as an example. In other embodiments, the non-light-emitting function can also perform other actions that are not simply light-emitting. For example, the non-light-emitting function can be designed to allow part of the light-emitting diode The body 11 does not emit light, but achieves different lighting or decorative effects.

To sum up, applying the method of the present invention to control a single-wire series-connected light-emitting diode drive circuit can provide advancements other than light emission without changing the signal and/or command format and without significantly changing the circuit architecture. The advanced function allows users and downstream manufacturers of LEDs to have a more flexible choice. In the sleep mode, in the conventional light-emitting diode device for lighting or decoration, even if the light-emitting diode is not lit, the control circuit is still in a state of power consumption, so there is a problem of power consumption. The method of the present invention can allow the single-wire series connection of the light-emitting diode drive circuit to additionally add a sleep mode that reduces power consumption, and can significantly improve the power life.

S11, S12, S13: light command S21, S22, S23: empty instructions T1: first interval time T2: second interval time T3: Sleep period P: wake-up pulse PD: function instruction 1: LED driver module 10: Light-emitting diode unit 101: Signal input interface 102: signal output interface 11: Light-emitting diode 12: Signal processor 121: The first storage unit 122: second storage unit 123: counting unit 124: sensing unit 125: shock unit 126: Line Switch 20: Processing module

"Figure 1" is a schematic block diagram of a circuit according to an embodiment of the present invention. "FIG. 2" is a schematic block diagram of a signal processor circuit according to an embodiment of the present invention. "Figure 3" is a schematic diagram of signals at different reference points at different times in an embodiment of the present invention.

S11, S12, S13: light command

S21, S22, S23: empty instructions

T1: first interval time

T2: second interval time

T3: Sleep period

P: wake-up pulse

Claims (10)

A control method for a single-line series connection of a light-emitting diode drive circuit includes the following steps: A light-emitting diode drive module is provided, including N light-emitting diode units connected in series with each other in a single line, and a processing module, where N is an integer greater than 1, and the light-emitting diode units each include a light-emitting diode And a signal processor electrically connected to the light emitting diode; The processing module generates a light emitting signal to the light emitting diode unit, the light emitting signal includes M1 light emitting commands corresponding to a display color, and M1 is an integer greater than 1; After the signal processor obtains the light-emitting signal, the signal processor controls the light-emitting diode to emit the corresponding display color according to the obtained light-emitting instruction; The processing module generates a function signal to the light emitting diode unit, and the function signal includes M2 blank commands that match the lighting command in format and a function command that is after the blank command and differs from the lighting command in format , M2 is an integer greater than 1; and After the signal processor obtains the function signal, the signal processor operates a non-luminous function according to the function command. According to the control method described in claim 1, wherein the signal processor includes a first storage unit for receiving and storing the light-emitting command, a second storage unit for receiving and storing the function command, and a calculation A counting unit for the number of bits of the light-emitting command, the empty command and the function command, a sensing unit, and an oscillating unit electrically connected to the sensing unit. According to the control method described in item 2 of the scope of patent application, the function command is a sleep command that causes the light emitting diode unit to enter a sleep mode. According to the control method described in item 3 of the scope of patent application, after the signal processor receives the sleep instruction, it turns off the oscillating unit and enters the sleep mode. The control method according to claim 4, wherein, after the sleep mode, the processing module generates a wake-up pulse to the signal processor, and the sensing unit starts the oscillating unit after receiving the wake-up pulse. Go to an operating mode. As for the control method described in item 5 of the scope of patent application, the wake-up pulse is a rising edge. The control method described in item 2 of the scope of patent application, wherein the signal processor of the i-th light-emitting diode unit stores the i-th light-emitting command, where i is between 1 and N Integer between. For example, in the control method described in item 7 of the scope of patent application, the signal processor passes the light-emitting signal and the function signal in a bypass manner so that the signal processor obtains the light-emitting command and the function command respectively. Such as the control method described in item 1 of the scope of patent application, where N=M1, M2=M1+1. Such as the control method described in item 1 of the scope of patent application, wherein the format is bit length.

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