TWM634813U - Led switching system - Google Patents

Abstract

A LED switching system is provided. The LED switching system is electrically connected to a three-phase power supply device including first, second, and third phase terminals. The LED switching system includes a control unit and a lighting module. The control unit is electrically connected to the first phase terminal and includes N control switches, where N is a positive integer. A lighting unit of the lighting module includes a power circuit, N+1 LED strings and a switching circuit electrically connected to each other. The power circuit is electrically connected to any two phase terminals and provides power to the LED strings. The switching circuit is electrically connected to the second or third phase terminal and the control unit, and the switching circuit is switched for turn on the corresponding LED string according to the state of the control switches.

Description

LED switching system

The present application relates to a switching system, especially an LED (light-emitting diode, light-emitting diode) switching system.

In the application of traditional fish-collecting lights, in order to emit corresponding light colors according to the habits of various fish to trap the fish, it is necessary to install a variety of light bulbs with different light colors, so that the light colors can be changed according to actual needs. In terms of light switching control, it is necessary to set a control switch for each light bulb, which leads to more complicated wiring and complicated control; and the control switch actually needs to flow through the current that drives the light bulb, so a larger rated current specification is required The switch, so it takes up a lot of space.

Therefore, how to develop an LED switching system that can improve the above-mentioned conventional technical problems is an urgent need at present.

The purpose of this application is to provide an LED switching system, which realizes the switching and conduction of multiple LED strings with a small number of switches, and the wiring is relatively simple and easy to control; and the switch is only used for signal driving, and the rated current can be selected Smaller switches occupy less space and are less expensive.

To achieve the above purpose, the present application provides an LED switching system electrically connected to a three-phase power supply device, wherein the three-phase power supply device includes a first phase terminal, a second phase terminal and a third phase terminal respectively providing three phase voltages. The LED switching system includes a control unit and a lighting module. The control unit is electrically connected to the first phase end of the three-phase power supply device, and includes N control switches, wherein N is a positive integer. The light-emitting module includes a light-emitting unit, and the light-emitting unit includes a power circuit electrically connected to each other, (N+1) LED strings and a switching circuit. The power supply circuit is also electrically connected to any two of the three phase terminals of the three-phase power supply device, and provides a supply voltage to (N+1) LED strings. The switching circuit is also electrically connected to the second or third phase terminal of the three-phase power supply device, and the switching circuit is also electrically connected to the control unit to switch according to the switching state of the control switch to turn on the corresponding LED string.

Some typical embodiments embodying the features and advantages of the present application will be described in detail in the description in the following paragraphs. It should be understood that the present application can have various changes in different aspects without departing from the scope of the present application, and that the descriptions and illustrations therein are used as illustrations in nature, not to limit the present application. Application.

Fig. 1 is a schematic diagram of the circuit structure of the LED switching system according to the first embodiment of the present application. As shown in Figure 1, the LED switching system 1 is electrically connected to a three-phase power supply device 2, wherein the three-phase power supply device 2 includes three phase terminals L1, L2 and L3, and the three phase terminals L1, L2 and L3 respectively provide phase-dependent Three phase voltages with a phase difference of 120 degrees. In this embodiment, the phase terminals L1, L2 and L3 are respectively used as the first phase terminal, the second phase terminal and the third phase terminal (ie, the first phase terminal L1, the second phase terminal L2 and the third phase terminal L3) . However, it is not limited thereto. In other embodiments, the phase terminals L1, L3 and L2 can also be used as the first, second and third phase terminals respectively, or the phase terminals L2, L1 and L3 can be used as the first phase terminals respectively. 1. The second and third phase terminals.

The LED switching system 1 includes a control unit 11 and a light emitting module 12 . The control unit 11 is electrically connected to the first phase terminal L1 of the three-phase power supply device 2, and includes N control switches SW1, SW2, . . . , SWN, wherein N is a positive integer. The lighting module 12 includes a lighting unit 13 , wherein the lighting unit 13 includes a power supply circuit 14 , (N+1) LED strings LED1 , LED2 , . . . , LED(N+1) and a switching circuit 15 electrically connected to each other. The power circuit 14 is also electrically connected to any two of the three phase terminals L1, L2 and L3 of the three-phase power supply device 2, and provides a power supply voltage to the LED strings LED1, LED2, . . . , LED(N+1). Each LED string LED1, LED2, . limit. The switching circuit 15 is also electrically connected to the second phase terminal L2 or the third phase terminal L3 of the three-phase power supply device 2 (the following figures and descriptions all take the third phase terminal L3 as an example), and the switching circuit 15 is also electrically connected to the The control unit 11 switches according to the switching states of the control switches SW1 , SW2 , . . . , SWN to turn on the corresponding LED strings. Specifically, when all control switches SW1, SW2, ..., SWN are turned off, the first LED string LED1 is turned on; and when the nth control switch SWn is turned on, the switching circuit 15 also passes through the nth control switch SWn It is electrically connected to the first phase terminal L1 and switched to turn on the (n+1)th LED string LED(n+1), wherein n is a positive integer less than or equal to N.

In this way, a smaller number of control switches than the traditional fish lamp structure can be used to switch and conduct multiple LED strings, and the wiring is simpler and easier to control; and the control switch is only used for signal drive, and the rated current specification can be selected. A small switch occupies less space and costs less.

In practice, the number of control switches that are simultaneously on is not limited. For example, in some embodiments, at any one time, at most one control switch is in the conduction state; in other embodiments, a plurality of control switches may be in the conduction state at the same time.

In addition, in the LED switching system 1 of the present application, the number of light emitting units 13 is not limited. For example, in the embodiment shown in FIG. 1, each light emitting module 12 includes three light emitting units 13, each of which emits light The units 13 are electrically connected to the control unit 11 and the three-phase power supply device 2 respectively. The (N+1) LED strings LED1, LED2, . . . , LED(N+1) in each light emitting unit 13 are preferably arranged in the same order of light colors, but it is not limited thereto. In addition, in the LED switching system 1 of the present application, the number of control units 11 and light emitting modules 12 is the same and not limited. For example, the LED switching system 1 may include a plurality of control units 11 and a plurality of There are several light-emitting modules 12, and the LED strings in each light-emitting module 12 can be arranged in the same or different order of light colors. In this way, when the LED switching system 1 of the present application is applied to the fishing lamp, all the control units 11 can be centrally arranged in the same space, and the light emitting modules 12 can be arranged in different areas on the fishing boat. Control the LED light color of each zone.

In addition, each LED string has an opposite first end and a second end. When the LED string includes a plurality of LEDs connected in series, the first end of the LED string is connected to the anode of the first LED, and then each LED The cathode of the LED is sequentially connected to the anode of the next LED, and the cathode of the last LED is connected to the second end of the LED string.

In some embodiments, the power circuit 14 includes two AC terminals AC1 and AC2 , a first DC terminal DC+ and a second DC terminal DC−. The two AC terminals AC1 and AC2 are electrically connected to any two phase terminals of the three-phase power supply device 2. In the embodiment shown in FIG. 1, the two AC terminals AC1 of the power supply circuit 14 in the first light-emitting unit 13 and AC2 are electrically connected to the first and second phase terminals L1 and L2 respectively, and the two AC terminals AC1 and AC2 of the power supply circuit 14 in the second light emitting unit 13 are electrically connected to the second and third phase terminals L2 and L3 respectively , the two AC terminals AC1 and AC2 of the power supply circuit 14 in the third light emitting unit 13 are electrically connected to the first and third phase terminals L1 and L3 respectively, but it is not limited to this, and it can be adjusted according to the actual application The phase terminal to which the power supply circuit 14 in each light emitting unit 13 is connected. The first DC terminal DC+ is used to provide a power supply voltage, and the second DC terminal DC- is grounded, wherein the voltage level of the first DC terminal DC+ is higher than the voltage level of the second DC terminal DC-.

There are many possible implementations of the switching circuit 15 of the LED switching system 1 of the present application, which will be exemplified and described in detail below.

In the first embodiment of the present application, as shown in FIG. 1 , the switching circuit 15 includes N relays RY1 , RY2 , . . . , RYN electrically connected to N control switches SW1 , SW2 , . Each relay (RY1, RY2, . The switch 152 includes a first contact point P1, a second contact point P2 and a third contact point P3. The third contact point P3 is electrically connected to the second contact point P2 and the first contact point P1 respectively when the coil 151 is energized and not energized. .

The first ends of all (N+1) LED strings LED1~LED(N+1) are electrically connected to the first DC terminal DC+, and the second end of the first LED string LED1 is electrically connected to the first relay RY1 The first contact P1 of the second to (N+1)th LED strings LED2~LED(N+1) The second ends are electrically connected to the second terminals of the first to Nth relays RY1~RYN respectively. Contact P2. The first contacts P1 of the second to Nth relays RY2~RYN are respectively electrically connected to the third contacts P3 of the first to (N-1)th relays RY1~RY(N-1), and the Nth The third contact P3 of the first relay RYN is grounded.

When all the control switches SW1~SWN are turned off, the third contacts P3 of all the relays RY1~RYN are electrically connected to the first contact P1, so that the first LED string LED1 is turned on. When the nth control switch SWn is turned on, the third contact P3 in the nth relay RYn is electrically connected to the second contact P2 instead, so that the n+1th LED string LED(n+1) is turned on.

Figure 2 is a schematic diagram of the circuit structure of the LED switching system in Figure 1 when N=1. As shown in FIG. 2 , when N=1, the number of control switches and relays in each light emitting unit 13 is equal to one. The first contact point P1, the second contact point P2 and the third contact point P3 of the relay RY1 are respectively electrically connected to the second end of the first LED string LED1, the second end of the second LED string LED2 and the ground end. The first terminals of the two LED strings LED1 and LED2 are both electrically connected to the first DC terminal DC+.

In the second embodiment of the present application, as shown in FIG. 3 , the switching circuit 15 includes N relays RY1 , RY2 , . . . , RYN electrically connected to N control switches SW1 , SW2 , . Each relay (RY1, RY2, ..., RYN) includes a coil 151 and a switch 152, and the two ends of each coil 151 are respectively electrically connected to the control switch (SW1, SW2) corresponding to each relay (RY1, RY2, ..., RYN). ,..., SWN) and the third phase terminal L3. The switch 152 includes a first contact point P1, a second contact point P2 and a third contact point P3. The third contact point P3 is electrically connected to the second contact point P2 and the first contact point P1 respectively when the coil 151 is energized and not energized. .

The third contact P3 of the first relay RY1 is electrically connected to the first DC terminal DC+, and the third contacts P3 of the second to Nth relays RY2~RYN are respectively electrically connected to the first to (N- 1) The first contact P1 of the relays RY1~RY(N-1), and the first contact P1 of the Nth relay RYN are electrically connected to the first end of the first LED string LED1. The first ends of the second to (N+1)th LED strings LED2~LED(N+1) are respectively electrically connected to the second contacts P2 of the first to Nth relays RY1~RYN, all (N +1) The second ends of the LED strings LED1~LED(N+1) are all grounded.

When all the control switches SW1~SWN are turned off, the third contacts P3 of all the relays RY1~RYN are electrically connected to the first contact P1, so that the first LED string LED1 is turned on. And when the nth control switch SWn is turned on, the third contact P3 in the nth relay RYn is changed to be electrically connected to the second contact P2, so that the (n+1)th LED string LED(n+1) conduction.

Figure 4 is a schematic diagram of the circuit structure of the LED switching system in Figure 3 when N=1. As shown in FIG. 4 , when N=1, the number of control switches and relays in each light emitting unit 13 is equal to one. The first contact P1, the second contact P2 and the third contact P3 of the relay RY1 are respectively electrically connected to the second end of the first LED string LED1, the second end of the second LED string LED2 and the first DC Terminal DC+. The second terminals of the two LED strings LED1 and LED2 are both grounded.

In the third embodiment of the present application, as shown in FIG. 5, the power supply circuit 14 also includes a first power supply terminal VCC1 and a second power supply terminal VCC2, wherein the first power supply terminal VCC1 and the second power supply terminal VCC2 are respectively used to provide the first voltage and the second voltage. Switching circuit 15 comprises N relays RY1, RY2, ..., RYN, N isolators OC1, OC2, ..., OCN, internal controller 153 and (N+1) driving switches Q1, Q2, ..., Q(N+ 1). The N relays RY1~RYN are respectively electrically connected to the N control switches SW1~SWN, and the N isolators OC1~OCN are respectively electrically connected to the N relays RY1~RYN. Each relay (RY1~RYN) includes a coil 154 and a switch 155, and the two ends of each coil 154 are respectively electrically connected to the control switch (SW1~SWN) corresponding to each relay (RY1~RYN) and the third phase terminal L3, Two ends of each switch 155 are respectively electrically connected to the first power supply terminal VCC1 and the emitter 156 of the isolator (OC1-OCN) corresponding to each relay (RY1-RYN). The switch 155 is turned on when the coil 154 is energized, and is turned off when the coil 154 is not energized. The two ends of the receiver 157 of each isolator (OC1~OCN) are respectively electrically connected to the second power supply terminal VCC2 and the internal controller 153, and when the transmitter 156 corresponding to the receiver 157 receives the signal through the conduction of the switch 155 When reaching the first voltage, the receiver 157 transmits the second voltage to the internal controller 153 . The internal controller 153 is electrically connected to all (N+1) driving switches Q1˜Q(N+1), and is used for controlling the switching states of all (N+1) driving switches Q1˜Q(N+1). The first ends of all (N+1) LED strings LED1~LED(N+1) are electrically connected to the first direct current terminal DC+, and the first ends of all (N+1) LED strings LED1~LED(N+1) The second end is electrically connected to all (N+1) drive switches Q1˜Q(N+1) respectively. The isolators (OC1~OCN) of this application can be, for example but not limited to, optocoupler devices or digital isolators. For example, when the isolators (OC1~OCN) are optocoupler components, the transmitter 156 and the receiver 157 are respectively an optical transmitter and an optical receiver, wherein the optical transmitter and the optical receiver can be respectively a light source and an optical sensor detectors, such as LED and photoelectric crystal respectively, but not limited thereto, it is only necessary to trigger the light receiver to be turned on when the light transmitter receives the first voltage.

When all the control switches SW1~SWN are turned off, all the switching switches 155 of all the relays RY1~RYN are turned off, and the internal controller 153 does not receive the second voltage transmitted by any isolator (OC1~OCN), so the control The first driving switch Q1 is turned on, so that the first LED string LED1 is turned on. And when the nth control switch SWn is turned on, the switching switch 155 of the nth relay RYn is turned on to transmit the first voltage to the transmitter 156 of the nth isolator OCn, and the receiver 157 of the nth isolator OCn is triggered The second voltage is transmitted to the internal controller 153, and the internal controller 153 correspondingly controls the (n+1)th drive switch Q(n+1) to be turned on, so that the (n+1)th LED string LED(n+1) conduction.

Figure 6 is a schematic diagram of the circuit structure of the LED switching system in Figure 5 when N=1. As shown in FIG. 6, when N=1, the number of control switches, relays and isolators in each light emitting unit 13 is equal to 1, and the number of driving switches is equal to 2. Two ends of the switching switch 155 of the relay RY1 are electrically connected to the first power supply terminal VCC1 and the transmitter 156 of the isolator OC1 respectively. Two ends of the receiver 157 of the isolator OC1 are electrically connected to the second power supply terminal VCC2 and the internal controller 153 respectively. The internal controller 153 is connected to the driving switches Q1 and Q2. The first terminals of the LED strings LED1 and LED2 are both electrically connected to the first DC terminal DC+, and the second terminals of the LED strings LED1 and LED2 are electrically connected to the driving switches Q1 and Q2 respectively.

In the fourth embodiment of the present application, as shown in FIG. 7, components having similar structures and functions to those in the third embodiment shown in FIG. 5 are denoted by the same reference numerals, and its control method for the LED string Same as the third embodiment shown in Fig. 5. However, compared with the third embodiment shown in FIG. 5, in the fourth embodiment shown in FIG. 7, the first ends of all (N+1) LED strings LED1~LED(N+1) are respectively All (N+1) driving switches Q1~Q(N+1) are electrically connected to the first DC terminal DC+, and the second terminals of all (N+1) LED strings LED1~LED(N+1) are grounded.

Figure 8 is a schematic diagram of the circuit structure of the LED switching system in Figure 7 when N=1. As shown in FIG. 8, when N=1, the number of control switches, relays and isolators in each light emitting unit 13 is equal to 1, and the number of driving switches is equal to 2. Two ends of the switching switch 155 of the relay RY1 are electrically connected to the first power supply terminal VCC1 and the transmitter 156 of the isolator OC1 respectively. Two ends of the receiver 157 of the isolator OC1 are electrically connected to the second power supply terminal VCC2 and the internal controller 153 respectively. The internal controller 153 is connected to the driving switches Q1 and Q2. The first terminals of the LED strings LED1 and LED2 are electrically connected to the first DC terminal DC+ through the driving switches Q1 and Q2 respectively, and the second terminals of the LED strings LED1 and LED2 are both grounded.

In the fifth embodiment of the present application, as shown in FIG. 9, the power supply circuit 14 also includes a first power supply terminal VCC1 and a second power supply terminal VCC2, wherein the first power supply terminal VCC1 and the second power supply terminal VCC2 are respectively used to provide the first voltage and the second voltage. The switching circuit 15 includes an internal control circuit 158 and (N+1) driving switches Q1, Q2, . . . , Q(N+1). The internal control circuit 158 is electrically connected to all N control switches SW1˜SWN, the third phase terminal L3 and all (N+1) driving switches Q1˜Q(N+1). The first ends of all (N+1) LED strings LED1~LED(N+1) are electrically connected to the first direct current terminal DC+, and the first ends of all (N+1) LED strings LED1~LED(N+1) The second end is electrically connected to all (N+1) drive switches Q1˜Q(N+1) respectively.

When all the control switches SW1 ˜ SWN are turned off, the internal control circuit 158 controls the first driving switch Q1 to be turned on, so that the first LED string LED1 is turned on. And when the nth control switch SWn is turned on, the AC power provided by the first phase terminal L1 and the third phase terminal L3 is input to the internal control circuit 158, and the internal control circuit 158 controls the (n+1)th driving switch Q(n +1) is turned on, so that the (n+1)th LED string LED(n+1) is turned on.

Figure 10 is a schematic diagram of the circuit structure of the LED switching system in Figure 9 when N=1. As shown in FIG. 10 , when N=1, the number of control switches is equal to 1, and the number of driving switches in each light emitting unit 13 is equal to 2. The internal control circuit 158 is electrically connected to the control switch SW1, the third phase terminal L3 and the two driving switches Q1 and Q2. The first ends of the two LED strings LED1 and LED2 are both electrically connected to the first DC terminal DC+, and the second ends of the two LED strings LED1 and LED2 are electrically connected to the two driving switches Q1 and Q2 respectively.

In the sixth embodiment of the present application, as shown in FIG. 11, the components having similar structures and functions to those in the fifth embodiment shown in FIG. 9 are denoted by the same reference numerals, and its control method for the LED string It is the same as the fifth embodiment shown in Fig. 9. However, compared with the fifth embodiment shown in FIG. 9, in the sixth embodiment shown in FIG. 11, the first ends of all (N+1) LED strings LED1~LED(N+1) are respectively All (N+1) driving switches Q1~Q(N+1) are electrically connected to the first DC terminal DC+, and the second terminals of all (N+1) LED strings LED1~LED(N+1) are grounded.

Fig. 12 is a schematic diagram of the circuit structure of the LED switching system in Fig. 11 when N=1. As shown in FIG. 10 , when N=1, the number of control switches is equal to 1, and the number of driving switches in each light emitting unit 13 is equal to 2. The internal control circuit 158 is electrically connected to the control switch SW1, the third phase terminal L3 and the two driving switches Q1 and Q2. The first terminals of the two LED strings LED1 and LED2 are electrically connected to the first DC terminal DC+ through the driving switches Q1 and Q2 respectively, and the second terminals of the two LED strings LED1 and LED2 are both grounded.

In the embodiments shown in FIGS. 5 to 12 , the driving switch can be, for example but not limited to, a metal-oxide-semiconductor field-effect transistor (MOSFET).

In practical applications, an appropriate switching circuit implementation can be selected according to requirements. For example, when applying to ultra-high power LED lamps above kilowatts, if the switching circuit in the first or second embodiment is used, a high withstand voltage relay must be selected, which will lead to a significant increase in cost, so in this case It is better to use the switching circuits in the third to sixth embodiments.

In addition, the internal control circuit 158 in the embodiments shown in Figures 9 to 12 includes various possible implementations. The internal control circuit 158 in Figure 10 is used as an example for illustration below, and for the sake of simplicity, only Internal control circuitry 158 and drive switches Q1 and Q2 are shown.

As shown in FIG. 13A , in some embodiments, the internal control circuit 158 includes a relay RY1 , an isolator OC1 and an internal controller 153 . The relay RY1 includes a coil 154 and a switch 155, wherein the two ends 154a and 154b of the coil 154 are respectively electrically connected to the control switch SW1 and the third phase terminal L3, and the two ends of the switch 155 are respectively electrically connected to the first power supply terminal VCC1 and the isolation Transmitter 156 of OC1. The switch 155 is turned on when the coil 154 is energized, and is turned off when the coil 154 is not energized. Both ends of the receiver 157 of the isolator OC1 are electrically connected to the second power supply terminal VCC2 and the internal controller 153 respectively, and when the transmitter 156 corresponding to the receiver 157 receives the first voltage through the conduction of the switching switch 155, The receiver 157 transmits the second voltage to the internal controller 153 . The internal controller 153 is electrically connected to the driving switches Q1 and Q2, and is used for controlling the switching states of the driving switches Q1 and Q2.

As shown in FIG. 13B , in some embodiments, the relay RY1 in FIG. 13A can be replaced with a driver 159 . Two ends 159 a and 159 b of the driver 159 are electrically connected to the control switch SW1 and the third phase terminal L3 respectively, and the driver 159 is also electrically connected to the first power supply terminal VCC1 and the transmitter 156 of the isolator OC1 . The driver 159 is configured to control the isolator OC1.

As shown in FIG. 13C , in some embodiments, the internal control circuit 158 includes a relay RY1 and an internal controller 153 . The relay RY1 includes a coil 154 and a switch 155, wherein the two ends 154a and 154b of the coil 154 are electrically connected to the control switch SW1 and the third phase terminal L3 respectively, and one end of the switch 155 is electrically connected to the first power supply terminal VCC1 and the internal controller 153, and the other end of the switch 155 is electrically connected to the other end of the internal controller 153. The switch 155 is turned on when the coil 154 is energized, and is turned off when the coil 154 is not energized. The internal controller 153 is also electrically connected to the driving switches Q1 and Q2, and used to control the switching states of the driving switches Q1 and Q2.

As shown in FIG. 13D , in some embodiments, the internal control circuit 158 includes an internal controller 153 . The first terminal 153a, the second terminal 153b, the third terminal 153c and the fourth terminal 153d of the internal controller 153 are respectively electrically connected to the control switch SW1, the third phase terminal L3, the driving switch Q1 and the driving switch Q2, and the internal controller The fifth terminal 153e of 153 is grounded. The internal controller 153 is configured to control the switching states of the driving switches Q1 and Q2.

It can be understood that the various possible implementations of the internal control circuit 158 in FIG. 10 illustrated in FIGS. 13A to 13D are also applicable to the internal control circuit 158 in FIGS. 9 , 11 and 12 . When the number of control switches is N, the number of driving switches and LED strings is N+1, and when the implementation shown in Figure 13A is adopted, the number of relays and isolators is N, and the number of internal controllers The quantity is 1; when using the implementation pattern shown in Figure 13B, the number of drivers and isolators is N, and the number of internal controllers is 1; when using the implementation style shown in Figure 13C, the number of relays is N, and the number of internal controllers is 1; when the implementation pattern shown in FIG. 13D is adopted, the number of internal controllers is 1.

To sum up, this application provides an LED switching system, which realizes the switching and conduction of multiple LED strings with a small number of switches, and the wiring is relatively simple and easy to control; and the switch is only used for signal driving, and can be selected A switch with a smaller rated current specification occupies less space and costs less. In addition, an appropriate switching circuit implementation can be adopted according to actual needs, so that the applicability of the LED switching system can be improved.

It should be noted that the above-mentioned preferred embodiments are only for illustrating the preferred embodiments of the present application, and the present application is not limited to the described embodiments, and the scope of the present application is determined by the scope of the attached patent application. And this application can be modified in various ways by the people who are familiar with this technology, but it will not break away from the intended protection of the scope of the attached patent application.

1: LED switching system 2: Three-phase power supply device L1, L2, L3: phase terminals 11: Control unit 12: Lighting module SW1, SW2, SWN: control switch 13: Lighting unit 14: Power circuit LED1, LED2, LED3, LED (N+1): LED string 15: Switching circuit AC1, AC2: AC terminal DC+: the first DC terminal DC-: the second DC terminal RY1, RY2, RYN: Relay 151: Coil 152: toggle switch P1: first contact P2: second contact P3: The third contact VCC1: the first power supply terminal VCC2: the second power supply terminal OC1, OC2, OCN: Isolators 153: Internal controller Q1, Q2, Q3, Q(N+1): drive switch 154: Coil 155: toggle switch 156: Launcher 157: Receiver 158: Internal control circuit 159: drive

Fig. 1 is a schematic diagram of the circuit structure of the LED switching system according to the first embodiment of the present application.

Figure 2 is a schematic diagram of the circuit structure of the LED switching system in Figure 1 when N=1.

Fig. 3 is a schematic diagram of the circuit structure of the LED switching system according to the second embodiment of the present application.

Figure 4 is a schematic diagram of the circuit structure of the LED switching system in Figure 3 when N=1.

FIG. 5 is a schematic diagram of the circuit structure of the LED switching system according to the third embodiment of the present application.

Figure 6 is a schematic diagram of the circuit structure of the LED switching system in Figure 5 when N=1.

FIG. 7 is a schematic diagram of the circuit structure of the LED switching system according to the fourth embodiment of the present application.

Figure 8 is a schematic diagram of the circuit structure of the LED switching system in Figure 7 when N=1.

FIG. 9 is a schematic diagram of the circuit structure of the LED switching system of the fifth embodiment of the present application.

Figure 10 is a schematic diagram of the circuit structure of the LED switching system in Figure 9 when N=1.

FIG. 11 is a schematic diagram of the circuit structure of the LED switching system according to the sixth embodiment of the present application.

Fig. 12 is a schematic diagram of the circuit structure of the LED switching system in Fig. 11 when N=1.

Figures 13A, 13B, 13C and 13D illustrate various possible implementations of the internal control circuit in Figure 10.

1: LED switching system

2: Three-phase power supply device

L1, L2, L3: phase terminals

11: Control unit

12: Lighting module

SW1, SW2, SWN: control switch

13: Lighting unit

14: Power circuit

LED1, LED2, LED3, LED(N+1): LED string

15: Switching circuit

AC1, AC2: AC terminal

DC+: the first DC terminal

DC-: the second DC terminal

RY1, RY2, RYN: Relay

151: Coil

152: toggle switch

P1: first contact

P2: second contact

P3: The third contact

Claims (14)

An LED switching system electrically connected to a three-phase power supply device, wherein the three-phase power supply device includes a first phase terminal, a second phase terminal and a third phase terminal respectively providing three phase voltages, the LED switching system includes: a control unit, electrically connected to the first phase terminal of the three-phase power supply device, and includes N control switches, where N is a positive integer; and A light-emitting module, including a light-emitting unit, wherein the light-emitting unit includes a power supply circuit, (N+1) LED strings and a switching circuit electrically connected to each other; the power supply circuit is also electrically connected to three of the three-phase power supply device any two of the phase terminals, and provide a power supply voltage to the (N+1) LED strings; the switching circuit is also electrically connected to the second or third phase terminals of the three-phase power supply device, and the The switching circuit is also electrically connected to the control unit, so as to switch according to the switching states of the N control switches to turn on the LED string corresponding to the control switch. The LED switching system as described in claim 1, wherein the power supply circuit includes two AC terminals, a first DC terminal and a second DC terminal, wherein the two AC terminals are electrically connected to any of the three-phase power supply devices There are two phase terminals, the first DC terminal is used to provide the power supply voltage, and the second DC terminal is grounded. The LED switching system as described in claim 2, wherein the switching circuit includes N relays electrically connected to the N control switches, each of the relays includes a coil and a switch, and the two ends of the coil are respectively electrically connected On the control switch and the second or third phase terminal corresponding to the relay, the changeover switch includes a first contact, a second contact and a third contact, and the third contact is energized on the coil and respectively electrically connected to the second contact point and the first contact point when no power is applied; the first ends of the (N+1) LED strings are all electrically connected to the first DC end, and the first LED string The second end of the LED string is electrically connected to the first contact of the first relay, and the second ends of the second to (N+1)th LED strings are respectively electrically connected to the first to Nth relays. The second contacts of the second to Nth relays are respectively electrically connected to the third contacts of the first to (N-1)th relays, and the Nth The third contact of the relay is grounded. The LED switching system as described in claim 2, wherein the switching circuit includes N relays electrically connected to the N control switches, each of the relays includes a coil and a switch, and the two ends of the coil are respectively electrically connected On the control switch and the second or third phase terminal corresponding to the relay, the changeover switch includes a first contact, a second contact and a third contact, and the third contact is energized on the coil and respectively electrically connected to the second contact and the first contact when no power is applied; the third contact of the first relay is electrically connected to the first DC terminal, and the second to Nth relays The third contacts of the relays are respectively electrically connected to the first contacts of the first to (N-1)th relays, and the first contacts of the Nth relay are electrically connected to the first LED string The first ends of the second to (N+1) LED strings are respectively electrically connected to the second contacts of the first to Nth relays, and the (N+1) The second ends of the LED strings are all grounded. The LED switching system as described in claim 2, wherein the power supply circuit also includes a first power supply terminal and a second power supply terminal for providing a first voltage and a second voltage respectively; the switching circuit includes an internal control circuit and (N +1) drive switches, the internal control circuit is electrically connected to the N control switches, the second or third phase terminal and the (N+1) drive switches, the (N+1) LED strings of the first One end is electrically connected to the first DC end, and the second ends of the (N+1) LED strings are respectively electrically connected to the (N+1) drive switches; when the N control switches are all turned off , the internal control circuit controls the first drive switch to be turned on, so that the first LED string is turned on, and when the nth control switch is turned on, the internal control circuit controls the (n+1)th drive switch to be turned on , to turn on the (n+1)th LED string, wherein n is a positive integer less than or equal to N. The LED switching system as described in claim 2, wherein the power supply circuit also includes a first power supply terminal and a second power supply terminal for providing a first voltage and a second voltage respectively; the switching circuit includes an internal control circuit and (N +1) drive switches, the internal control circuit is electrically connected to the N control switches, the second or third phase terminal and the (N+1) drive switches, the (N+1) LED strings of the first One end is electrically connected to the first DC end via the (N+1) driving switches, and the second ends of the (N+1) LED strings are all grounded; when the N control switches are all turned off, The internal control circuit controls the first drive switch to be turned on, so that the first LED string is turned on, and when the nth control switch is turned on, the internal control circuit controls the (n+1)th drive switch to be turned on, Turn on the (n+1)th LED string, where n is a positive integer less than or equal to N. The LED switching system as described in claim 5 or 6, wherein the internal control circuit includes N relays, N isolators and an internal controller; the N relays are electrically connected to the N control switches, and the N The isolators are respectively electrically connected to the N relays; each of the relays includes a coil and a switch, and the two ends of the coil are respectively electrically connected to the control switch and the second or third phase terminal corresponding to the relay, The two ends of the switch are respectively electrically connected to the first power supply terminal and the transmitter of the corresponding isolator, the switch is turned on when the coil is energized, and is turned off when the coil is not energized; each isolator The two ends of the receiver are respectively electrically connected to the second power supply terminal and the internal controller, and the internal controller is electrically connected to the (N+1) driving switches and used to control the (N+1) driving switches switch status. The LED switching system as described in claim 5 or 6, wherein the internal control circuit includes N drivers, N isolators and an internal controller; each driver is electrically connected to the second or third phase terminal and the Corresponding to the control switch, the N isolators are respectively electrically connected to the N drivers; each driver is also electrically connected to the first power supply terminal and the transmitter of the corresponding isolator, and the receiver of each isolator The two ends of the device are respectively electrically connected to the second power supply terminal and the internal controller, and the internal controller is electrically connected to the (N+1) drive switches and used to control the switches of the (N+1) drive switches state. The LED switching system as described in claim 5 or 6, wherein the internal control circuit includes N relays and an internal controller, and the N relays are respectively electrically connected to the N control switches; each of the relays includes a coil and A changeover switch, the two ends of the coil are respectively electrically connected to the control switch corresponding to the relay and the second or third phase end, and one end of the changeover switch is electrically connected to the second power supply end and the internal controller One end, the other end of the switch is electrically connected to the other end of the internal controller, the switch is turned on when the coil is energized, and turned off when the coil is not energized; the internal controller is electrically connected to the (N+ 1) drive switches, and are used to control the switching states of the (N+1) drive switches. The LED switching system as described in claim 5 or 6, wherein the internal control circuit includes an internal controller, and the internal controller is electrically connected to the N control switches, the second or third phase terminal and the (N+ 1) drive switches, and are used to control the switching states of the (N+1) drive switches. The LED switching system according to claim 1, wherein the light emitting module includes a plurality of light emitting units, and the plurality of light emitting units are respectively electrically connected to the control unit and the three-phase power supply device. The LED switching system as described in Claim 1, wherein the LED switching system includes a plurality of the control units and a plurality of the light emitting modules corresponding to each other. The LED switching system according to claim 1, wherein each LED string includes a plurality of LEDs connected in series. The LED switching system according to claim 1, wherein the phase difference between the two phase voltages provided by the first phase terminal and the third phase terminal is 120 degrees.

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