Light-emitting diode light string with automatic sequencing function and automatic sequencing method thereof

Abstract

The present disclosure relates to an LED light string with an automatic sequencing function and an automatic sequencing method thereof. The LED light string includes a plurality of LED modules, and the method includes the following steps: (a) establishing a starting reference time before the plurality of LED modules are powered on; (b) when each of the LED modules is operated, a working voltage of each of the LED modules rises to reach an identification voltage, generating a plurality of different time differences starting from the starting reference time; and (c) determining the order of the plurality of LED modules according to the plurality of time differences, so as to achieve the automatic sequencing function.

Description

Technical Field

[0001] The present disclosure relates to a light emitting diode light string with automatic sequencing function and an automatic sequencing method thereof, and in particular to a light emitting diode light string with automatic sequencing function achieved by time calculation and an automatic sequencing method thereof. Background Art

[0002] Since light-emitting diodes (LEDs) have the advantages of high luminous efficiency, low power consumption, long life, fast response speed, and high reliability, they have been widely used in lighting fixtures or decorative lighting, such as Christmas tree lighting, sports shoe lighting effects, etc., in the form of series, parallel, or series-parallel connection of light bars or light strings.

[0003] Taking festival lighting as an example, a complete LED lamp basically includes an LED light string (with multiple lamps) and a driving unit for driving the lamps. The driving unit is electrically connected to the light string, and by providing the required power and a control signal with light emission data to the lamps, it controls the lamps in a point-controlled or synchronous manner to achieve a variety of light output effects and changes of the LED lamps.

[0004] In the current technology, in order to drive the LEDs of the LED light string to emit light in a variety of ways, the LEDs have different address sequence data. The LEDs receive a light signal including light emitting data and address data: if the address sequence data of the LED is the same as the address data of the light emitting signal, the LED emits light according to the light emitting data of the light emitting signal; if the address sequence data of the LED is different from the address data of the light emitting signal, the LED skips the light emitting data of the light emitting signal.

[0005] Currently, the sequencing methods of the LEDs of the LED light string are mostly complicated or difficult; for example, before the LEDs are combined into the LED light string, different address sequence data needs to be recorded for each LED. Afterwards, the LEDs are placed and combined into the LED light string in sequence according to the address sequence data. If the LEDs are not placed in sequence according to the address sequence data, the diversified light emission of the LEDs cannot be achieved correctly.

[0006] Therefore, how to design an LED light string with automatic sequencing function and its automatic sequencing method, especially an LED light string with automatic sequencing function through time calculation and its automatic sequencing method, so as to solve the problems of the prior art, is an important topic studied by the inventor of this case. Summary of the invention

[0007] An object of the present disclosure is to provide a light emitting diode light string with an automatic sequencing function, so as to solve the problem of using addresses as light emitting diode sequencing in the prior art.

[0008] To achieve the aforementioned purpose, the LED light string with automatic sequencing function proposed in the present disclosure includes a circuit switch, a plurality of LED modules and a control unit. The plurality of LED modules are connected to the circuit switch. Each of the LED modules includes an identification circuit connected to a driving voltage source. The control unit is used to generate a control signal to control the on and off of the circuit switch. Before the plurality of LED modules are turned on, the control unit controls the circuit switch to be turned off so that a working voltage of each of the LED modules is lower than an identification voltage, and then the identification circuit establishes a starting reference time. The control unit controls the circuit switch to be turned on so that the working voltage rises to reach the identification voltage, and then the identification circuit generates a plurality of different time differences starting from the starting reference time. The plurality of LED modules determine their own order according to the plurality of time differences to achieve the function of automatic sequencing.

[0009] In one embodiment, the generated multiple time difference values ​​are compared with multiple time difference ranges to determine the sequence of the multiple light emitting diode modules.

[0010] In one embodiment, the plurality of time difference ranges are established in a lookup table.

[0011] In one embodiment, the identification circuit includes a plurality of diodes connected in series, a switch, a resistor, and a switching switch. The switch connects the plurality of diodes in series to form a series path. One end of the resistor is connected to one end of the series path. The switching switch connects the other end of the series path with the other end of the resistor to switch to the operation of the plurality of diodes and the switch on the series path, or to the operation of the resistor. The identification circuit includes a plurality of P-type metal oxide semiconductor field effect transistor switches connected in series, a P-type metal oxide semiconductor field effect transistor switch, and a switching switch. The plurality of P-type metal oxide semiconductor field effect transistor switches connected in series form a series path. One end of the P-type metal oxide semiconductor field effect transistor switch is connected to one end of the series path. The switching switch connects the other end of the series path with the other end of the P-type metal oxide semiconductor field effect transistor switch to switch to the operation of the plurality of P-type metal oxide semiconductor field effect transistor switches on the series path, or to the operation of the P-type metal oxide semiconductor field effect transistor switch.

[0012] In one embodiment, the identification circuit includes a plurality of N-type metal oxide semiconductor field effect transistor switches connected in series, an N-type metal oxide semiconductor field effect transistor switch, and a switching switch. The plurality of N-type metal oxide semiconductor field effect transistor switches connected in series form a series path. One end of the N-type metal oxide semiconductor field effect transistor switch is connected to one end of the series path. The switching switch connects the other end of the series path with the other end of the N-type metal oxide semiconductor field effect transistor switch to switch to the operation of the plurality of N-type metal oxide semiconductor field effect transistor switches on the series path, or to the operation of the N-type metal oxide semiconductor field effect transistor switch.

[0013] In one embodiment, the plurality of LED modules form an LED light string having a serial connection structure.

[0014] In one embodiment, the plurality of LED modules form an LED light string having a serial-parallel connection structure.

[0015] In one embodiment, the plurality of LED modules form an LED light string that is connected in series.

[0016] With the proposed LED light string with automatic sequencing function, the corresponding relationship between the time difference and the light sequence provided by the built-in lookup table can be used to determine the order of the LED modules by correspondingly searching through the obtained time difference, thereby simplifying the circuit design and quickly completing the sequencing of the LED light string.

[0017] Another object of the present disclosure is to provide an automatic sequencing method for an LED light string to solve the problems existing in the prior art of using addresses as the sequencing method for LEDs.

[0018] To achieve the above-mentioned purpose, the present disclosure provides an automatic sequencing method for an LED light string, wherein the LED light string includes a plurality of LED modules. The method includes the following steps: (a) before the plurality of LED modules are powered on, a starting reference time is established; (b) after each of the LED modules is operated, a working voltage of each of the LED modules rises to an identification voltage to generate a plurality of different time differences starting from the starting reference time; and (c) according to the plurality of time differences, the sequence of the plurality of LED modules is determined to achieve the function of automatic sequencing.

[0019] In one embodiment, step (a) includes: controlling to turn off a line switch connecting the plurality of LED modules so that the operating voltage of each LED module is lower than the identification voltage, and the identification circuit establishes the starting reference time.

[0020] In one embodiment, step (b) includes: controlling the line switch to be turned on so that the operating voltage rises to reach the identification voltage.

[0021] In one embodiment, the generated multiple time difference values ​​are compared with multiple time difference ranges to determine the sequence of the multiple light emitting diode modules.

[0022] In one embodiment, the plurality of time difference ranges are established in a lookup table.

[0023] By means of the proposed automatic sequencing method for LED light strings, the corresponding relationship between the time difference and the light sequence provided by the built-in lookup table can be used to determine the order of the LED modules by correspondingly searching through the obtained time difference, thereby simplifying the circuit design and quickly completing the sequencing of the LED light strings.

[0024] In order to further understand the technology, means and effects adopted by the present disclosure to achieve the intended purpose, please refer to the following detailed description and drawings of the present disclosure. It is believed that the purpose, characteristics and features of the present disclosure can be deeply and specifically understood thereby. However, the drawings are only provided for reference and illustration and are not intended to limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 : A circuit block diagram of a LED light string with an automatic sequencing function in which multiple LED modules are connected in series.

[0026] Figure 2 : A circuit block diagram of a light emitting diode light string with automatic sequencing function in which multiple light emitting diode modules are connected in series and parallel to form a structure disclosed in the present invention.

[0027] Figure 3 : A circuit block diagram of a light emitting diode light string with automatic sequencing function formed by a plurality of light emitting diode modules and connected in series according to the present invention.

[0028] Figure 4A : is a circuit diagram of the first embodiment of the identification circuit of the light emitting diode module disclosed in the present invention.

[0029] Figure 4B : is a circuit diagram of a second embodiment of the identification circuit of the light emitting diode module disclosed in the present invention.

[0030] Figure 4C : is a circuit diagram of a third embodiment of the identification circuit of the light emitting diode module disclosed in the present invention.

[0031] Figure 5 : This is a waveform diagram of the present invention that achieves automatic sequencing function through time calculation.

[0032] Fig. 6A : Circuit diagram of a first embodiment of a parallel sequenced LED light string powered by a constant voltage source of the present disclosure.

[0033] Figure 6B : Circuit diagram of a first embodiment of a parallel sequenced LED light string powered by a constant current source of the present disclosure.

[0034] Fig. 7A : Circuit diagram of a second embodiment of a parallel sequenced LED light string powered by a constant voltage source of the present invention.

[0035] Figure 7B : Circuit diagram of a second embodiment of a parallel sequenced LED light string powered by a constant current source of the present invention.

[0036] Figure 8 :It is a flow chart of the automatic sequencing method of the light emitting diode light string disclosed in the present invention.

[0037]

Main component symbol description

[0038] LED1~LED N : Light Emitting Diode Module;

[0039] S LED :switch;

[0040] V+: positive voltage terminal;

[0041] V-: negative voltage terminal;

[0042] V DC+ : DC positive voltage terminal;

[0043] V DC- : DC negative voltage terminal;

[0044] V DD : DC drive voltage;

[0045] V IDEN : Identify voltage;

[0046] 100: control unit;

[0047] 10: Identification circuit;

[0048] D 11 ~D 13 :diode;

[0049] S 11 :switch;

[0050] R 11 :resistance;

[0051] SW1: switch;

[0052] S 21 ~S 24 :switch;

[0053] SW2: switch;

[0054] S 31 ~S 34 :switch;

[0055] SW3: toggle switch;

[0056] t0: starting reference time;

[0057] t1~t 50 :time;

[0058] T1~T 50 : time difference;

[0059] 10: Power cord;

[0060] 11,12,…,1N: light emitting diode module;

[0061] R L1 ,R L2 ,…,R LN ,R L1’ ,R L2’ ,…,R LN’ : Line resistance;

[0062] R1,R2,…,R N :resistance;

[0063] C1,C2,…,C N : Parasitic capacitance;

[0064] V1,V2,…,V N :Voltage;

[0065] Vdc: power supply;

[0066] Idc: power supply;

[0067] 20: compensation unit;

[0068] S11~S13: steps. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0070] See also Figure 1 , which is a circuit block diagram of a LED light string with automatic sequencing function formed by a series connection structure of a plurality of LED modules disclosed in the present invention. In this embodiment, a LED light string with automatic sequencing function (hereinafter referred to as LED light string) includes a plurality of LED modules LED1~LED N These light-emitting diode modules LED1~LED N A series of (N) LED light strings are formed. The positive voltage terminal V+ of the first LED module LED1 is connected via a switch S LED Coupled to a DC positive voltage terminal V DC+ All the intermediate LED modules are connected in series, and the last LED module LED N The negative voltage terminal V- is coupled to a DC negative voltage terminal V DC- In this circuit architecture, the control unit 100 is used to control the switch S LED The on and off of the DC drive voltage V DD For these light emitting diode modules LED1~LED N Whether the power supply is driven or not.

[0071] See also Figure 2 As shown, it is a circuit block diagram of a LED light string with automatic sequencing function formed by a series-parallel connection structure of a plurality of LED modules disclosed in the present invention. In this embodiment, the LED light string includes a plurality of LED modules LED 11 ~LED 1N ,LED 21 ~LED 2N ,LED M1 ~LED MN These LED modules form a series structure of N LED modules, and a LED light string formed by M series structures connected in parallel. The first LED module LED in each series structure 11 ,LED 21 ,LED M1 The positive voltage terminal V+ passes through a switch S LED Coupled to a DC positive voltage terminal V DC+ , all the intermediate light emitting diode modules are connected in series or in parallel, and the last light emitting diode module LED 1N ,LED 2N ,LED MN The negative voltage terminal V- is coupled to a DC negative voltage terminal V DC- In this circuit architecture, the control unit 100 is used to control the switch S LEDThe on and off of the DC drive voltage V DD For these LED modules LED 11 ~LED 1N ,LED 21 ~LED 2N ,LED M1 ~LED MN Whether the power supply is driven or not.

[0072] See also Figure 3 As shown, it is a circuit block diagram of a LED light string with automatic sequencing function formed by a plurality of LED modules and connected in series. In this embodiment, the LED light string includes a plurality of LED modules LED 11 ~LED M1 ,LED 12 ~LED M2 ,LED 1N ~LED MN These LED modules form a parallel structure with M LED modules, and a LED light string formed by N parallel structures connected in series. 11 ,LED 21 ,LED M1 The positive voltage terminal V+ passes through a switch S LED Coupled to a DC positive voltage terminal V DC+ All the LED modules in between are connected in series or in parallel, and each LED module LED in the last parallel structure 1N ,LED 2N ,LED MN The negative voltage terminal V- is coupled to a DC negative voltage terminal V DC- In this circuit architecture, the control unit 100 is used to control the switch S LED The on and off of the DC drive voltage V DD For these LED modules LED 11 ~LED M1 ,LED 12 ~LED M2 ,LED 1N ~LED MN Whether the power supply is driven or not.

[0073] by Figure 1 The LED light string of the serial connection structure is used as an example, and it is assumed that the number of LED modules is 50. Each LED module includes an identification circuit 10. Figure 4A, which is a circuit diagram of a first embodiment of the identification circuit of the light emitting diode module disclosed in the present invention. The identification circuit 10 has, for example but not limited to, three diodes D connected in series. 11 ~D 13 , and a series diode D 11 ~D 13 A switch S 11 . Under the external DC drive voltage V DD When gradually increasing, for example, due to the three series diodes D 11 ~D 13 The forward bias voltage is 2.1 volts (0.7 volts each), plus the switch S 11 The forward bias voltage of 0.7 volts is 2.8 volts. DD When the voltage gradually increases but has not yet reached but is close to 2.8V (for example but not limited to 2.6V), by switching the switch S LED turned off, so that the DC drive voltage V DD Instantaneously decreases and is lower than the identification voltage V IDEN At this time, the switch SW1 is switched from the connection state between the second terminal and the first terminal to the connection state between the second terminal and the third terminal, that is, the series diode D 11 ~D 13 With switch S 11 The path is switched to resistor R 11 The path is recorded as the starting reference time t0, so that the starting reference time t0 can be generated (set) as the base time of the time calculation method, and the voltage of the light emitting diode module is gradually increased to reach the identification voltage V IDEN time, thus the time difference of the light emitting diode module can be obtained, taking the first light emitting diode as an example, the first time difference T1=t1-t0.

[0074] At this time, the voltage waveform of the positive voltage terminal V+ of all 50 light-emitting diode modules relative to the negative voltage terminal V- as a reference (hereinafter referred to as the relative voltage waveform) is as follows: Figure 5 As indicated. Figure 5 The circuit characteristic shown is that for different LED modules, the 50 sets of relative voltage waveforms presented have an obvious positive correlation with their series connection sequence. Therefore, according to this circuit characteristic, automatic sequencing of all 50 LED modules is achieved through time calculation.

[0075] Specifically, since the relative voltage waveform is the voltage characteristic of each LED module, in order to make all (50 groups) of relative voltage waveforms be used as effective judgments of the order of the corresponding LED modules, the concept of the starting reference (base) time is introduced, and the time of each relative voltage waveform is calculated as the difference between the starting reference time, so that multiple different time differences can be obtained. Figure 5 As shown, due to the DC drive voltage V DD Gradually increase, so that the voltage of the first light-emitting diode module LED1 reaches the identification voltage V IDEN Therefore, from the start reference time t0 until the voltage of the first light emitting diode module LED1 reaches the identification voltage V IDEN The time difference between the first time t1 and the second time t2 is the first time difference T1. DD Gradually increases, so that the voltage of the second light-emitting diode module LED2 reaches the identification voltage V IDEN Therefore, from the start reference time t0 until the voltage of the second light emitting diode module LED2 reaches the identification voltage V IDEN The time difference between the second time t2 is the second time difference T2. Similarly, since the DC driving voltage V DD Gradually increase, so that the 50th LED module LED 50 The voltage reaches the identification voltage V IDEN Therefore, from the starting reference time t0 to the 50th light emitting diode module LED 50 The voltage reaches the identification voltage V IDEN time (i.e. the 50th time t 50 ) is the 50th time difference T 50 .

[0076] Before time t0, that is, before the starting reference time t0, switch S LED When turned on, the DC drive voltage V DD The voltage of all LED modules increases instantly, and all LED modules become high potential state. Then, at the starting reference time t0, switch S LED At this time, the DC drive voltage V DD Instantaneous decrease. Figure 5 As shown, when the DC drive voltage V DD The voltage drops momentarily and is lower than the identification voltage V IDEN When the time is set as the starting reference time t0.

[0077] See also Figure 4BAs shown, it is a circuit diagram of the second embodiment of the identification circuit of the light emitting diode module disclosed in the present invention. 21 , S 22 , S 23 The substrate, or base or substrate, is connected together as a shared reference point (directly using the integrated circuit substrate). At this time, the circuit characteristics are close to a very small resistance value. Therefore, the current flowing through the switch S 21 , S 22 , S 23 The current is very large (for example, 350 mA), and for each LED module, the circuit effect is similar. Therefore, the relative voltage waveform of each LED module can be regarded as overlapping on the same line at the starting reference time t0, based on the principle of large current instantaneous discharge.

[0078] In other words, by first switching the switch S LED conduction, so that the DC drive voltage V DD Increase momentarily, then turn on switch S LED Turn off, so that the DC drive voltage V DD The relative voltage waveforms of all LED modules are reduced instantaneously, and overlap at the starting reference time t0, so that the starting reference time t0 can be generated (set) as the base time of the time calculation method, thereby calculating and obtaining the aforementioned multiple time differences. At this time, the switch SW2 is switched from the connection state between the second terminal and the first terminal to the connection state between the second terminal and the third terminal, that is, the series switch S 21 ~S 23 The path is switched to switch S 24 The path is recorded as the starting reference time t0, so that the starting reference time t0 can be generated (set) as the base time for the time calculation method. Then, switch S LED conduction, and controls the DC drive voltage V DD Slowly increase, for example but not limited to, by connecting to a capacitor component so that the DC drive voltage V DD The voltage of the LED module gradually increases and reaches the identification voltage V IDEN Therefore, the time difference of the LED module can be obtained. Taking the first LED as an example, the first time difference T1=t1-t0. Therefore, the complete 50 sets of relative voltage waveforms can be shown as follows: Figure 5 shown.

[0079] Also, see Figure 4C, which is a circuit diagram of the third embodiment of the identification circuit of the light emitting diode module disclosed in the present invention. The main difference between the third embodiment and the second embodiment is that the third embodiment uses an n-type metal oxide semiconductor field effect transistor switch (such as a MOS switch) S 31 , S 32 , S 33 The substrates are connected together as a shared reference point, and the remaining operation strategies can simulate the identification circuit of the second embodiment, so they are not described in detail here.

[0080] In summary, the starting reference time t0 can be obtained (by switching the switch S LED The time point when the relative voltage waveforms of all LED modules overlap can be set (defined) as the starting reference time t0, and each LED module LED1~LED 50 The voltage reaches the identification voltage V IDEN The time length (time width) can be calculated (recorded), so the time width of all light-emitting diode modules LED1~LED 50 The time difference between T1 and T 50 .

[0081] In one embodiment, the identification voltage V IDEN For example but not limited to 1.5 or 2 V. In addition, the voltage at the initial reference time t0 (before it drops instantly) is about 3 V (assuming that the external power supply voltage is 150 V, which is borne by 50 LED modules on average).

[0082] Furthermore, by providing each light emitting diode module LED1~LED N A lookup table is established in the circuit to realize the identification and judgment of the sequence. For example, the circuit designer can correspond the light emitting diode modules LED1~LED N The lookup table is pre-established to achieve the multiple light emitting diode modules LED1~LED N The sequencing of .

[0083] As shown below, an implementation of the lookup table is shown, in which 50 light emitting diode modules LED1~LED N Let me give you an example to illustrate this.

[0084]

[0085] Thus, when each light emitting diode module LED1~LED NAfter the operation, the light sequence of each light emitting diode module LED1~LED can be obtained according to the obtained time difference and the corresponding light sequence of the built-in lookup table. N For example, when the time difference value obtained by a certain LED module is 12.95 microseconds, the LED module can correspond to the 4th LED module according to its built-in lookup table. Alternatively, when the time difference value obtained by a certain LED module is 17.08 microseconds, the LED module can correspond to the 6th LED module according to its built-in lookup table. And so on, which will not be repeated here. In this way, according to the multiple time differences, the order of the multiple LED modules is determined to achieve the function of automatic sequencing.

[0086] Incidentally, the time difference of the above-mentioned lookup table is designed based on a time range, that is, it is not compared with a specific time value. As in the above-mentioned embodiment, the light sequence is designed to correspond to a time range of 2 microseconds, but this is not intended to limit the present disclosure. In fact, it can be based on the number of LED modules, the identification voltage V IDEN Depending on the size of or other circuit parameters, the time range in the lookup table is designed differently.

[0087] Therefore, when the sequencing of the LED light string (all LED modules) is completed, the sequencing mode ends and returns to the normal operation mode. Therefore, the identification circuit 10 is no longer required to operate, and the serial number data and the light emitting data are then sent, so that the LED module performs its controlled light emitting behavior.

[0088] See also Fig. 6A and Figure 6B As shown, they are circuit diagrams of the first embodiment of the parallel sequenced LED light string powered by a constant voltage source and a constant current source of the present disclosure. Fig. 7A and Figure 7B As shown, they are circuit diagrams of the second embodiment of the parallel sequenced LED light string powered by a constant voltage source and a constant current source of the present disclosure. The above description mainly focuses on the LED modules LED1~LED N When forming a series structure of LED light strings, the time difference (range) is used as the size of the LED module LED1~LED N In addition, for the LED light strings with parallel structure, the LED light strings can be quickly sequenced by adjusting the resistance or by resistance compensation. Figure 2 ) or parallel-series connection structure ( Figure 3 ), the series connection part is Figure 4A to Figure 4C as well as Figure 5 The parallel connection is realized by Fig. 6A and Figure 6B as well as Fig. 7A and Figure 7B The following is for Fig. 6A and Figure 6B as well as Fig. 7A and Figure 7B A brief explanation.

[0089] like Fig. 6A As shown, the plurality of LED modules 11, 12, ..., 1N connected in parallel receive a power supply Vdc. In this embodiment, the power supply Vdc is a constant voltage source, which is used to provide a voltage source with a fixed voltage. The power supply Vdc is connected to the plurality of line resistors R L1 ,R L2 ,…,R LN ,R L1’ ,R L2’ ,…,R LN’ and the plurality of resistors R1, R2, ..., R in the plurality of light emitting diode modules 11, 12, ..., 1N. N , so that the voltages generated on the light emitting diode modules 11, 12, ..., 1N are different in magnitude.

[0090] When powered on, since the circuits in the LED modules 11, 12, ..., 1N have not yet started and operated, the LED modules 11, 12, ..., 1N can be equivalent to the corresponding resistors R1, R2, ..., R N Furthermore, for the convenience of explanation, the line resistance R L1 With line resistance R L1’ Equivalent to a single line resistance R L1 Similarly, the line resistance R L2 With line resistance R L2’ Equivalent to a single line resistance R L2 ,…Line resistance R LN With line resistance R LN’ Equivalent to a single line resistance R LN .

[0091] When powered on, the power supply Vdc supplies power to the plurality of light emitting diode modules 11, 12, ..., 1N. As the current flows through each line resistor R L1 ,R L2 ,…,R LN The voltage difference caused by this embodiment is that the power supply Vdc of the constant voltage source passes through each line resistor R L1 ,R L2 ,…,R LNThe voltage difference is a voltage drop, so the voltages generated on the LED modules 11, 12, ..., 1N are different. A first voltage V1 on the first LED module 11 is greater than a second voltage V2 on the second LED module 12, the second voltage V2 is greater than a third voltage V3 on the third LED module 13, and so on. That is, the voltage generated by the front (upstream) LED module is greater than the voltage generated by the rear (downstream) LED module (V1>V2>...>V N ). Thus, according to the generated voltages V1, V2, ..., V N The plurality of light emitting diode modules 11, 12, ..., 1N are sequenced. N The sequencing principle of the light emitting diode modules 11, 12, ..., 1N of different sizes is explained.

[0092] In one embodiment, this can be achieved by building a corresponding lookup table. For example, the circuit designer can calculate the power supply Vdc, the number of the plurality of LED modules 11, 12, ..., 1N, the plurality of line resistors R L1 ,R L2 ,…,R LN The (estimated) size of the resistors R1, R2, ..., R N The size of the lookup table is pre-established to generate the voltage V1, V2, ..., V N , so as to achieve the sequencing of the multiple light emitting diode modules 11, 12, ..., 1N.

[0093] In order to improve the accuracy of comparison, judgment and identification between the detected voltage and the voltage range of the lookup table, the resistors R1, R2, ..., R N It can be a controllable resistor with adjustable resistance. And, when the plurality of light emitting diode modules 11, 12, ..., 1N are sequenced at power-on, each controllable resistor (ie, each resistor R1, R2, ..., R N ) is designed to be the minimum value so that the current flowing through each resistor R1, R2, ..., R N The current is the largest, so the voltages V1, V2, ..., V generated on each of the light emitting diode modules 11, 12, ..., 1N are N It can be the maximum, thereby improving the accuracy of comparison, judgment, and identification of the detected voltage and the voltage range of the lookup table.

[0094] like Figure 6BAs shown, in this embodiment, the power supply Idc is a constant current source, which is used to provide a current source with a fixed current. L1 ,R L2 ,…,R LN ,R L1’ ,R L2’ ,…,R LN’ and the plurality of resistors R1, R2, ..., R in the plurality of light emitting diode modules 11, 12, ..., 1N. N , so that the voltages generated on the light emitting diode modules 11, 12, ..., 1N are different in magnitude.

[0095] When powered on, since the circuits in the LED modules 11, 12, ..., 1N have not yet started and operated, the LED modules 11, 12, ..., 1N can be equivalent to the corresponding resistors R1, R2, ..., R N Furthermore, for the convenience of explanation, the line resistance R L1 With line resistance R L1’ Equivalent to a single line resistance R L1 Similarly, the line resistance R L2 With line resistance R L2’ Equivalent to a single line resistance R L2 ,…Line resistance R LN With line resistance R LN’ Equivalent to a single line resistance R LN .

[0096] When powered on, the power supply Idc supplies power to the plurality of light emitting diode modules 11, 12, ..., 1N. As the current flows through each line resistor R L1 ,R L2 ,…,R LN The voltage difference caused by the constant current source Idc is L1 ,R L2 ,…,R LN The voltage difference caused is a voltage rise, so the voltages generated on the LED modules 11, 12, ..., 1N are different. A first voltage V1 on the first LED module 11 is smaller than a second voltage V2 on the second LED module 12, and the second voltage V2 is smaller than a third voltage V3 on the third LED module 13, and so on. That is, the voltage generated by the front (upstream) LED module is smaller than the voltage (V1) generated by the rear (downstream) LED module. <V2<…<V N ). Thus, according to the generated voltages V1, V2, ..., V NThe plurality of light emitting diode modules 11, 12, ..., 1N are sequenced. N The sequencing principle of the light emitting diode modules 11, 12, ..., 1N of different sizes is explained.

[0097] like Fig. 7A The LED light string shown is Fig. 6A The biggest differences between the LED light strings shown are: Fig. 7A The resistance value of each LED module 11, 12, ..., 1N in the LED light string does not have the same Fig. 6A is a controllable characteristic, that is, to achieve the effect of resistance compensation, Fig. 7A The LED light string shown further includes a compensation unit 20 to replace the Fig. 6A The resistance value of each light emitting diode module 11, 12, ..., 1N can be controlled and adjusted. In other words, Fig. 6A and Figure 6B The implemented compensation method with adjustable resistance (i.e. controllable resistance) is realized by the compensation unit 20, thus not only simplifying the circuit control but also saving the circuit cost. The compensation unit 20 is an integrated circuit (IC) having a counting function, or the compensation unit 20 is a circuit composed of a ratio circuit and a digital circuit having a counting function.

[0098] When the power is turned on for the first time, because the multiple resistors R1, R2, ..., R N The two are in parallel connection, so the equivalent resistance is the smallest, and the current flowing is the largest. The first voltage V1 corresponding to the first order (first cycle) of the pulse signal can be obtained.

[0099] When the first power-on is completed, the first resistor R1 can be turned off and the impedance of the compensation unit 20 can be controlled to be reduced (i.e., the impedance compensation of the compensation unit 20) so that the equivalent resistance value after parallel connection is the same, so that the current flowing through can be the same. When the power is turned on again, the second voltage V2 corresponding to the second sequence (second cycle) of the pulse signal can be obtained.

[0100] Similarly, when the second power-on is completed, the first resistor R1 and the second resistor R2 can be turned off, and the impedance of the compensation unit 20 can be controlled to be reduced again, so that the equivalent resistance value after parallel connection will be the same, that is, when the first resistor R1 and the second resistor R2 are both turned off, the impedance of the compensation unit 20 will be less than the impedance when only the first resistor R1 is turned off (that is, the impedance compensation of the compensation unit 20), so that the current flowing through can be the same. When the power is turned on again, the third voltage V3 corresponding to the third sequence (third cycle) of the pulse signal can be obtained. In this way, the sequence signal can be used as the basis of the sequence, and the impedance of the compensation unit 20 can be adjusted (reduced) to maintain the current consistency, so that the voltage difference between any two light-emitting diode modules remains fixed, so as to improve the accuracy of the detected voltage recognition.

[0101] Compared to Fig. 7A Constant voltage power supply, Figure 7B The impedance compensation of the constant current power supply is achieved by increasing the resistance of the compensation unit 20 so that the equivalent resistance value after parallel connection will increase, which can reduce the current flowing through. In this way, the sequence signal can be used as the basis of the sequence, and the resistance of the compensation unit 20 can be adjusted (increased) to maintain the current consistency, so that the voltage difference between any two light-emitting diode modules remains fixed, thereby improving the accuracy of the detected voltage recognition.

[0102] See also Figure 8 As shown, it is a flow chart of the automatic sequencing method of the light emitting diode light string disclosed in the present invention, and is combined with reference to Figure 5 The automatic sequencing method of the LED light string comprises the following steps. First, before the plurality of LED modules are powered on, a starting reference time is established (S11). Then, after each of the LED modules is operated, a working voltage of each of the LED modules rises to reach an identification voltage, generating a plurality of different time differences starting from the starting reference time (S12). Finally, according to the plurality of time differences, the sequence of the plurality of LED modules is determined to achieve the function of automatic sequencing (S13).

[0103] Incidentally, the automatic sequencing method of the LED light string provided in the present disclosure may correspond to the operation of the aforementioned LED light string with automatic sequencing function. Therefore, the specifics and details of the automatic sequencing method can be found in the corresponding specification, and will not be elaborated here.

[0104] In summary, the present disclosure has the following features and advantages: through the corresponding relationship between the time difference and the light sequence provided by the built-in lookup table, the order of the LED modules can be determined by corresponding lookup through the obtained time difference, thereby simplifying the circuit design and quickly completing the sequencing of the LED light string.

[0105] The above description is only a detailed description and drawings of the preferred specific embodiments of the present disclosure. The features of the present disclosure are not limited thereto and are not intended to limit the present disclosure. The entire scope of the present disclosure shall be subject to the following patent application scope. All embodiments that are in line with the spirit of the patent application scope of the present disclosure and similar variations thereof shall be included in the scope of the present disclosure. Any changes or modifications that can be easily conceived by a technician familiar with the field of the present disclosure shall be covered by the following patent scope of the present case.

Claims

1. A light emitting diode light string with automatic sequencing function, characterized in that: Include: A circuit breaker; A plurality of light emitting diode modules are connected to the line switch, each of the light emitting diode modules comprising: an identification circuit connected to a driving voltage source; and A control unit, used to generate a control signal to control the on and off of the line switch; Before the plurality of light emitting diode modules are powered on, the control unit controls to turn off the circuit switch, so that a working voltage of each light emitting diode module is lower than an identification voltage, and then the identification circuit establishes a starting reference time; The control unit controls the line switch to be turned on, so that the working voltage rises to reach the identification voltage, and then the identification circuit generates a plurality of different time differences starting from the starting reference time; The plurality of light emitting diode modules compare the plurality of time differences with a plurality of time difference ranges established in a lookup table to determine their own order, so as to achieve an automatic sequencing function.

2. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The generated multiple time difference values ​​are compared with multiple time difference ranges to determine the sequence of the multiple light emitting diode modules.

3. The LED light string with automatic sequencing function as claimed in claim 2, characterized in that: The multiple time difference ranges are established in a lookup table.

4. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The identification circuit comprises: Multiple diodes connected in series; a switch connecting the plurality of diodes in series to form a series path; a resistor having one end connected to one end of the series path; and A switch connects the other end of the series path and the other end of the resistor, and is used to switch to the operation of the plurality of diodes and the switch on the series path, or to switch to the operation of the resistor.

5. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The identification circuit comprises: A plurality of P-type metal oxide semiconductor field effect transistor switches connected in series form a series path; a P-type metal oxide semiconductor field effect transistor switch, one end of which is connected to one end of the series path; and A switching switch connects the other end of the series path and the other end of the P-type metal oxide semiconductor field effect transistor switch to switch to the operation of the multiple P-type metal oxide semiconductor field effect transistor switches on the series path, or switches to the operation of the P-type metal oxide semiconductor field effect transistor switch.

6. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The identification circuit comprises: A plurality of N-type metal oxide semiconductor field effect transistor switches connected in series form a series path; an N-type metal oxide semiconductor field effect transistor switch, one end of which is connected to one end of the series path; and A switch connects the other end of the series path and the other end of the N-type metal oxide semiconductor field effect transistor switch to switch to the operation of the multiple N-type metal oxide semiconductor field effect transistor switches on the series path, or switches to the operation of the N-type metal oxide semiconductor field effect transistor switch.

7. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The plurality of light emitting diode modules form a light emitting diode lamp string of a serial connection structure.

8. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The plurality of light emitting diode modules form a light emitting diode lamp string of a series-parallel connection structure.

9. The LED light string with automatic sequencing function as claimed in claim 1, characterized in that: The plurality of light emitting diode modules form a light emitting diode lamp string of a series connection structure.

10. An automatic sequencing method for a light emitting diode light string, characterized in that: The LED light string includes a line switch and a plurality of LED modules connected to the line switch; each of the LED modules includes an identification circuit and a control unit. The method includes the steps of: (a) before the plurality of light emitting diode modules are powered on, the control unit controls the circuit switch to be turned off, so that the identification circuit establishes a starting reference time; (b) after each of the light emitting diode modules is operated, the control unit controls the line switch to be turned on, so that an operating voltage of each of the light emitting diode modules rises to reach an identification voltage, and then the identification circuit generates a plurality of different time differences starting from the starting reference time; and (c) The plurality of light emitting diode modules are compared with a plurality of time difference ranges established in a lookup table to determine the order of the plurality of light emitting diode modules, so as to achieve an automatic sequencing function.

11. The automatic sequencing method of a light emitting diode light string as claimed in claim 10, characterized in that: In step (a) comprising: A line switch connected to the plurality of light emitting diode modules is controlled to be turned off, so that the working voltage of each light emitting diode module is lower than the identification voltage, and then the identification circuit establishes the starting reference time.

12. The automatic sequencing method of a light emitting diode light string as claimed in claim 11, characterized in that: In step (b) comprising: The line switch is controlled to be turned on so that the working voltage rises to reach the identification voltage.

13. The automatic sequencing method of a light emitting diode light string as claimed in claim 10, characterized in that: The generated multiple time difference values ​​are compared with multiple time difference ranges to determine the sequence of the multiple light emitting diode modules.

14. The automatic sequencing method of a light emitting diode light string as claimed in claim 13, characterized in that: The multiple time difference ranges are established in a lookup table.

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