CN218868402U

CN218868402U - LED switching system

Info

Publication number: CN218868402U
Application number: CN202221370484.5U
Authority: CN
Inventors: 陈凯威; 赖彦志; 郑忠杰; 庄家毅
Original assignee: Genshun Technology Co ltd; Delta Electronics Inc
Current assignee: Genshun Technology Co ltd; Delta Electronics Inc
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2023-04-14
Anticipated expiration: 2032-06-02

Abstract

The application provides an LED switching system which is electrically connected to a three-phase power supply device comprising a first phase end, a second phase end and a third phase end. The LED switching system comprises a control unit and a light emitting module. The control unit is electrically connected to the first phase terminal and includes N control switches, where N is a positive integer. The light emitting unit of the light emitting module comprises a power circuit, an (N + 1) LED string and a switching circuit which are electrically connected with each other. The power circuit is electrically connected to any two phase terminals and supplies power to the LED strings. The switching circuit is electrically connected to the second or third phase terminal and the control unit to switch according to the on-off state of the control switch to conduct the corresponding LED string.

Description

LED switching system

Technical Field

The present application relates to a switching system, and more particularly, to a light-emitting diode (LED) switching system.

Background

In the application of the traditional fish gathering lamp, in order to emit corresponding light colors according to habits of various fishes to trap the fishes, a plurality of bulbs with different light colors are required to be installed, so that the light colors can be changed according to actual requirements. In the aspect of light switching control, a control switch needs to be correspondingly arranged for each bulb, so that wiring is complex and control is complex; in addition, the control switch actually needs to pass through the current for driving the bulb, and a switch with a larger rated current specification needs to be selected, so that the occupied space is larger.

Therefore, how to develop an LED switching system that can improve the above-mentioned problems in the prior art is a urgent need.

SUMMERY OF THE UTILITY MODEL

The purpose of the application is to provide an LED switching system, which realizes switching conduction of a plurality of LED strings by using a small number of switches, and is simple in wiring and easy to control; and the switch is only used for driving signals, and the switch with smaller rated current specification can be selected, so that the occupied space is small, and the cost is lower.

To achieve the above objective, 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 for providing three phase voltages, respectively. The LED switching system comprises a control unit and a light-emitting module. The control unit is electrically connected to a first phase end of the three-phase power supply device and comprises N control switches, wherein N is a positive integer. The light emitting module comprises a light emitting unit, wherein the light emitting unit comprises a power circuit, an (N + 1) LED string and a switching circuit which are electrically connected with each other. The power 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 the (N + 1) LED strings. The switching circuit is also electrically connected to the second phase end or the third phase end of the three-phase power supply device, and the switching circuit is also electrically connected to the control unit so as to switch the corresponding LED strings to be conducted according to the on-off state of the control switch.

In an embodiment of the present invention, the power circuit includes two ac terminals, a first dc terminal and a second dc terminal, wherein the two ac terminals are electrically connected to any two of the phase terminals of the three-phase power supply device, the first dc terminal is used for providing the power voltage, and the second dc terminal is grounded.

In an embodiment of the present invention, the switching circuit includes N relays electrically connected to the N control switches, each of the relays includes a coil and a switch, two ends of the coil are electrically connected to the control switch and the second phase terminal or the third phase terminal corresponding to the relay, respectively, the switch includes a first contact, a second contact and a third contact, the third contact is electrically connected to the second contact and the first contact when the coil is powered on or not powered on; the first ends of the (N + 1) LED strings are electrically connected to the first direct current end, the second end of the 1 st LED string is electrically connected to the first contact of the 1 st relay, the second ends of the 2 nd to (N + 1) th LED strings are electrically connected to the second contacts of the 1 st to nth relays, the first contacts of the 2 nd to nth relays are electrically connected to the third contacts of the 1 st to (N-1) th relays, and the third contact of the nth relay is grounded.

In an embodiment of the present invention, the switching circuit includes N relays electrically connected to the N control switches respectively, each of the relays includes a coil and a switch, two ends of the coil are electrically connected to the control switch corresponding to the relay and the second phase terminal or the third phase terminal respectively, the switch includes a first contact, a second contact and a third contact, the third contact is electrically connected to the second contact and the first contact respectively when the coil is powered on and not powered off; the third contact of the 1 st relay is electrically connected to the first DC terminal, the third contacts of the 2 nd to Nth relays are electrically connected to the first contacts of the 1 st to (N-1) th relays respectively, the first contact of the Nth relay is electrically connected to the first end of the 1 st LED string, the first ends of the 2 nd to (N + 1) th LED strings are electrically connected to the second contacts of the 1 st to Nth relays respectively, and the second ends of the (N + 1) th LED strings are all grounded.

In an embodiment of the present invention, the power circuit further 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 comprises an internal control circuit and (N + 1) driving switches, wherein the internal control circuit is electrically connected to the N control switches, the second phase end or the third phase end and the (N + 1) driving switches, the first ends of the (N + 1) LED strings are electrically connected to the first direct current end, and the second ends of the (N + 1) LED strings are respectively electrically connected to the (N + 1) driving switches; when the N control switches are all turned off, the internal control circuit controls the 1 st driving switch to be turned on to enable the 1 st LED string to be turned on, and when the nth control switch is turned on, the internal control circuit controls the (N + 1) th driving switch to be turned on to enable the (N + 1) th LED string to be turned on, wherein N is a positive integer less than or equal to N.

In an embodiment of the present invention, the power circuit further includes a first power terminal and a second power terminal for providing a first voltage and a second voltage, respectively; the switching circuit comprises an internal control circuit and (N + 1) driving switches, wherein the internal control circuit is electrically connected to the N control switches, the second phase end or the third phase end and the (N + 1) driving switches, the first ends of the (N + 1) LED strings are electrically connected to the first direct current end through the (N + 1) driving switches respectively, 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 1 st driving switch to be turned on to enable the 1 st LED string to be turned on, and when the nth control switch is turned on, the internal control circuit controls the (N + 1) th driving switch to be turned on to enable the (N + 1) th LED string to be turned on, wherein N is a positive integer less than or equal to N.

In an embodiment of the present invention, the internal control circuit includes N relays, N isolators, and an internal controller; the N relays are respectively electrically connected to the N control switches, and the N isolators are respectively electrically connected to the N relays; each relay comprises a coil and a change-over switch, wherein two ends of the coil are respectively and electrically connected with the control switch corresponding to the relay and the second phase end or the third phase end, two ends of the change-over switch are respectively and electrically connected with the first power supply end and the corresponding transmitter of the isolator, and the change-over switch is switched on when the coil is electrified and switched off when the coil is not electrified; two ends of the receiver of each isolator are respectively electrically connected to the second power supply end and the internal controller, and the internal controller is electrically connected to the (N + 1) driving switches and is used for controlling the on-off state of the (N + 1) driving switches.

In an embodiment of the present invention, the internal control circuit includes N drivers, N isolators, and an internal controller; each driver is respectively and electrically connected with the second phase end or the third phase end and the corresponding control switch, and the N isolators are respectively and electrically connected with the N drivers; each driver is also electrically connected to the first power supply end and the transmitter of the corresponding isolator, two ends of the receiver of each isolator are respectively electrically connected to the second power supply end and the internal controller, and the internal controller is electrically connected to the (N + 1) driving switches and is used for controlling the on-off state of the (N + 1) driving switches.

In an embodiment of the present invention, the internal control circuit includes N relays and an internal controller, the N relays are electrically connected to the N control switches, respectively; each relay comprises a coil and a change-over switch, two ends of the coil are respectively and electrically connected with the control switch corresponding to the relay and the second phase end or the third phase end, one end of the change-over switch is electrically connected with the second power supply end and one end of the internal controller, the other end of the change-over switch is electrically connected with the other end of the internal controller, and the change-over switch is switched on when the coil is electrified and is switched off when the coil is not electrified; the internal controller is electrically connected to the (N + 1) driving switches and is used for controlling the on-off state of the (N + 1) driving switches.

In an embodiment of the present invention, the internal control circuit includes an internal controller electrically connected to the N control switches, the second phase terminal or the third phase terminal, and the (N + 1) driving switches, and configured to control the on/off states of the (N + 1) driving switches.

In an embodiment of the present invention, the light emitting module includes a plurality of the light emitting units electrically connected to the control unit and the three-phase power supply device, respectively.

In an embodiment of the present invention, the LED switching system includes a plurality of the control units and a plurality of the light emitting modules corresponding to each other one by one.

In an embodiment of the present invention, each of the LED strings includes a plurality of LEDs connected in series.

In an embodiment of the present invention, the phase difference between the two phase voltages provided by the first phase terminal and the third phase terminal is 120 degrees.

Drawings

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

fig. 2 is a schematic circuit diagram of the LED switching system of fig. 1 when N = 1;

FIG. 3 is a schematic circuit diagram of an LED switching system according to a second embodiment of the present application;

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

fig. 5 is a schematic circuit diagram of an LED switching system according to a third embodiment of the present application;

fig. 6 is a schematic circuit diagram of the LED switching system of fig. 5 when N = 1;

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

fig. 8 is a schematic circuit diagram of the LED switching system of fig. 7 when N = 1;

FIG. 9 is a schematic circuit diagram of an LED switching system according to a fifth embodiment of the present application;

fig. 10 is a schematic circuit diagram of the LED switching system of fig. 9 when N = 1;

fig. 11 is a schematic circuit diagram of an LED switching system according to a sixth embodiment of the present application;

fig. 12 is a schematic circuit diagram of the LED switching system of fig. 11 when N = 1;

13A, 13B, 13C, and 13D illustrate various possible implementations of the internal control circuitry of FIG. 10.

[ description of symbols ]

1: LED switching system

2: three-phase power supply device

L1, L2, L3: phase terminal

11: control unit

12: light emitting module

SW1, SW2, SWN: control switch

13: light emitting unit

14: power supply circuit

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

15: switching circuit

AC1, AC2: AC terminal

DC +: first direct current terminal

DC-: second direct current terminal

RY1, RY2, RYN: relay with a movable contact

151: coil

152: change-over switch

P1: first contact

P2: second contact

P3: third contact

VCC1: a first power supply terminal

VCC2: second power supply terminal

OC1, OC2, OCN: isolator

153: internal controller

Q1, Q2, Q3, Q (N + 1): driving switch

154: coil

155: change-over switch

156: emitter

157: receiver with a plurality of receivers

158: internal control circuit

159: driver

Detailed Description

Some exemplary embodiments that embody features and advantages of the present application will be described in detail in the description that follows. As will be realized, the application is capable of modifications in various aspects, all without departing from the scope of the application, and the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

Fig. 1 is a schematic circuit structure diagram of an LED switching system according to a first embodiment of the present application. As shown in fig. 1, the LED switching system 1 is electrically connected to a three-phase power supply 2, wherein the three-phase power supply 2 includes three phase terminals L1, L2 and L3, and the three phase terminals L1, L2 and L3 respectively provide three phase voltages with phases sequentially different by 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 (i.e. the first phase terminal L1, the second phase terminal L2 and the third phase terminal L3). However, it is not limited thereto, and in other embodiments, the phase terminals L1, L3 and L2 may be used as the first, second and third phase terminals, respectively, or the phase terminals L2, L1 and L3 may be used as the first, second and third phase terminals, respectively.

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, \ 8230, SWN, where N is a positive integer. The light emitting module 12 includes a light emitting unit 13, wherein the light emitting unit 13 includes a power circuit 14, a (N + 1) LED string LED1, LED2, \8230, an LED (N + 1), and a switching circuit 15 electrically connected to each other. The power circuit 14 is further 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 voltage to the LED strings LED1, LED2, \8230;, LED (N + 1). Each LED string LED1, LED2, \ 8230, LED (N + 1) may for example, but not limited thereto, comprise a plurality of LEDs connected in series, wherein the plurality of LEDs of the same LED string preferably have the same light color, but not limited thereto. The switching circuit 15 is further electrically connected to the second phase terminal L2 or the third phase terminal L3 of the three-phase power supply device 2 (the third phase terminal L3 is taken as an example in the following figures and descriptions), and the switching circuit 15 is further electrically connected to the control unit 11 for switching to conduct the corresponding LED strings according to the switch states of the control switches SW1, SW2, \\ 8230;, and SWN. Specifically, when all the control switches SW1, SW2, \ 8230, SWN are turned off, the 1 st LED string LED1 is turned on; when the nth control switch SWn is turned on, the switching circuit 15 is further electrically connected to the first phase terminal L1 through the nth control switch SWn, and switches to turn on the (N + 1) th LED string LED (N + 1), where N is a positive integer less than or equal to N.

Therefore, the switching conduction of the LED strings can be realized by a smaller number of control switches than the traditional fish gathering lamp structure, and the wiring is simpler and easier to control; and the control switch is only used for driving signals, and a switch with smaller rated current specification can be selected, so that the occupied space is small, and the cost is lower.

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

In addition, in the LED switching system 1 of the present application, the number of the light emitting units 13 is not limited, for example, in the embodiment shown in fig. 1, each of the light emitting modules 12 includes three light emitting units 13, wherein each of the light emitting units 13 is electrically connected to the control unit 11 and the three-phase power supply device 2. The (N + 1) LED strings LED1, LED2, 8230in each light emitting unit 13 are preferably arranged in the same light color sequence, but not limited thereto. In addition, in the LED switching system 1 of the present application, the number of the control units 11 and the 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 light emitting modules 12 corresponding to each other one by one, and the LED strings in each light emitting module 12 may be arranged in the same or different light color sequence. Therefore, when the LED switching system 1 of the present application is applied to a fishing lamp, all the control units 11 can be intensively disposed in the same space, and the light emitting modules 12 can be disposed in different areas on a fishing boat, so that a user can intensively control the LED light color of each area.

In addition, each LED string has a first end and a second end which are opposite to each other, and under the condition that the LED string comprises a plurality of LEDs which are connected in series, the first end of the LED string is connected to the anode of the 1 st LED, then the cathode of each 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-. In the embodiment shown in fig. 1, two AC terminals AC1 and AC2 of the power circuit 14 in the 1 st light emitting unit 13 are electrically connected to the first and second phase terminals L1 and L2, respectively, two AC terminals AC1 and AC2 of the power circuit 14 in the 2 nd light emitting unit 13 are electrically connected to the second and third phase terminals L2 and L3, respectively, two AC terminals AC1 and AC2 of the power circuit 14 in the 3 rd light emitting unit 13 are electrically connected to the first and third phase terminals L1 and L3, respectively, but not limited thereto, and the phase terminals to which the power circuits 14 in the light emitting units 13 are connected may be adjusted according to requirements in practical application. The first direct current terminal DC + is used for providing a supply voltage, and the second direct current terminal DC-is grounded, wherein the voltage level on the first direct current terminal DC + is higher than the voltage level on the second direct current terminal DC-.

There are many possible embodiments of the switching circuit 15 of the LED switching system 1 of the present application, which will be specifically illustrated and described below.

In the first embodiment of the present application, as shown in fig. 1, the switching circuit 15 includes N relays RY1, RY2, 8230; and RYN electrically connected to N control switches SW1, SW2, and 8230, respectively. Each relay (RY 1, RY2, \\ 8230;, RYN) includes a coil 151 and a switch 152, and both ends of the coil 151 are electrically connected to the corresponding control switches (SW 1, SW2, \ 8230;, SWN) and the third phase terminal L3, respectively. The changeover switch 152 includes a first contact P1, a second contact P2, and a third contact P3, and the third contact P3 is electrically connected to the second contact P2 and the first contact P1 when the coil 151 is energized and de-energized, respectively.

First ends of all (N + 1) LED strings LED 1-LED (N + 1) are electrically connected to a first direct current end DC +, a second end of the 1 st LED string LED1 is electrically connected to a first contact P1 of the 1 st relay RY1, and second ends of the 2 nd to (N + 1) th LED strings LED 2-LED (N + 1) are electrically connected to second contacts P2 of the 1 st to Nth relays RY 1-RYN respectively. The first contact P1 of the 2 nd to nth relays RY2 to RYN is electrically connected to the third contact P3 of the 1 st to (N-1) th relays RY1 to RY (N-1), respectively, and the third contact P3 of the nth relay RYN is grounded.

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

Fig. 2 is a schematic circuit structure diagram of the LED switching system in fig. 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 1. A first contact P1, a second contact P2, and a third contact P3 of the relay RY1 are electrically connected to the second end of the 1 st LED string LED1, the second end of the 2 nd LED string LED2, and the ground, respectively. First ends of the two LED strings LED1 and LED2 are 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, 8230; and RYN electrically connected to N control switches SW1, SW2, 8230; and SWN, respectively. Each relay (RY 1, RY2, \ 8230;, RYN) includes a coil 151 and a switch 152, and both ends of each coil 151 are electrically connected to the control switches (SW 1, SW2, \ 8230;, SWN) and the third phase terminal L3 corresponding to the relays (RY 1, RY2, \ 8230;, RYN). The changeover switch 152 includes a first contact P1, a second contact P2, and a third contact P3, and the third contact P3 is electrically connected to the second contact P2 and the first contact P1 when the coil 151 is energized and de-energized, respectively.

The third contact P3 of the 1 st relay RY1 is electrically connected to the first DC terminal DC +, the third contacts P3 of the 2 nd to nth relays RY2 to RYN are electrically connected to the first contacts P1 of the 1 st to (N-1) th relays RY1 to RY (N-1), respectively, and the first contact P1 of the nth relay RYN is electrically connected to the first end of the 1 st LED string LED 1. The first ends of the 2 nd to (N + 1) th LED strings LED2 to LED (N + 1) are respectively electrically connected to the second contact P2 of the 1 st to Nth relays RY1 to RYN, and the second ends of all the (N + 1) LED strings LED1 to LED (N + 1) are all grounded.

Fig. 4 is a schematic circuit structure diagram of the LED switching system of fig. 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 1. A first contact P1, a second contact P2, and a third contact P3 of the relay RY1 are electrically connected to the second end of the 1 st LED string LED1, the second end of the 2 nd LED string LED2, and the first DC terminal DC +, respectively. The second ends of the two LED strings LED1 and LED2 are both grounded.

In a third embodiment of the present application, as shown in fig. 5, the power circuit 14 further 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 configured to provide a first voltage and a second voltage. Switching circuit 15 includes N relays RY1, RY2, \ 8230, RYN, N isolators OC1, OC2, \8230, OCN, internal controller 153, and (N + 1) drive switches Q1, Q2, \ 8230, Q (N + 1). N relays RY 1-RYN are electrically connected to N control switches SW 1-SWN respectively, and N isolators OC 1-OCN are electrically connected to N relays RY 1-RYN respectively. Each relay (RY 1 to RYN) includes a coil 154 and a switch 155, both ends of each coil 154 are electrically connected to the control switches (SW 1 to SWN) and the third phase terminal L3 corresponding to each relay (RY 1 to RYN), respectively, and both ends of each switch 155 are electrically connected to the first power supply terminal VCC1 and the transmitter 156 of the isolators (OC 1 to OCN) corresponding to each relay (RY 1 to RYN), respectively. The changeover switch 155 is turned on when the coil 154 is energized, and turned off when the coil 154 is not energized. Two ends of the receiver 157 of each isolator (OC 1-OCN) 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 switch 155, the receiver 157 transmits the second voltage to the internal controller 153. The internal controller 153 is electrically connected to all of the (N + 1) driving switches Q1 to Q (N + 1), and is configured to control the on/off states of all of the (N + 1) driving switches Q1 to Q (N + 1). The first ends of all (N + 1) LED strings LED 1-LED (N + 1) are electrically connected to the first DC end DC +, and the second ends of all (N + 1) LED strings LED 1-LED (N + 1) are electrically connected to all (N + 1) driving switches Q1-Q (N + 1) respectively. The isolators (OC 1-OCN) of the present application may be, for example, but not limited to, opto-electric coupling elements or digital isolators. For example, when the isolators (OC 1 to OCN) are photo-coupled devices, the transmitter 156 and the receiver 157 are respectively a light emitter and a light receiver, wherein the light emitter and the light receiver can be respectively a light source and a light sensor, such as an LED and a photo-transistor, but not limited thereto, the light emitter can trigger the light receiver to be turned on when receiving the first voltage.

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

Fig. 6 is a schematic circuit structure diagram of the LED switching system of fig. 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. Both ends of the changeover 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. 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. The internal controller 153 is connected to the driving switches Q1 and Q2. First ends of the LED strings LED1 and LED2 are electrically connected to the first direct current end DC +, and second ends of the LED strings LED1 and LED2 are electrically connected to the driving switches Q1 and Q2 respectively.

In a fourth embodiment of the present application, as shown in fig. 7, elements having similar structures and functions as those in the third embodiment shown in fig. 5 are denoted by the same reference numerals, and the control manner for the LED strings is the same as that in the third embodiment shown in fig. 5. However, in contrast to the third embodiment shown in fig. 5, in the fourth embodiment shown in fig. 7, the first terminals of all (N + 1) LED strings LED1 to LED (N + 1) are electrically connected to the first DC terminal DC + via all (N + 1) driving switches Q1 to Q (N + 1), respectively, and the second terminals of all (N + 1) LED strings LED1 to LED (N + 1) are all grounded.

Fig. 8 is a schematic circuit structure diagram of the LED switching system of fig. 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. Both ends of the changeover 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. First ends of the LED strings LED1 and LED2 are electrically connected to the first DC terminal DC + via the driving switches Q1 and Q2, respectively, and second ends of the LED strings LED1 and LED2 are grounded.

In a fifth embodiment of the present application, as shown in fig. 9, the power circuit 14 further 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 for providing a first voltage and a second voltage. The switching circuit 15 includes an internal control circuit 158 and (N + 1) driving switches Q1, Q2, \8230;, Q (N + 1). The internal control circuit 158 is electrically connected to all of the N control switches SW1 to SWN, the third phase terminal L3, and all of the (N + 1) drive switches Q1 to Q (N + 1). The first ends of all (N + 1) LED strings LED 1-LED (N + 1) are electrically connected to the first DC end DC +, and the second ends of all (N + 1) LED strings LED 1-LED (N + 1) are electrically connected to all (N + 1) driving switches Q1-Q (N + 1).

When all the control switches SW1 to SWN are turned off, the internal control circuit 158 controls the 1 st driving switch Q1 to be turned on, so that the 1 st LED string LED1 is turned on. 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) to be turned on, so that the (n + 1) th LED string LED (n + 1) is turned on.

Fig. 10 is a schematic circuit structure diagram of the LED switching system in fig. 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 drive 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. First ends of the two LED strings LED1 and LED2 are electrically connected to the first direct current end DC +, and second ends of the two LED strings LED1 and LED2 are electrically connected to the two driving switches Q1 and Q2 respectively.

In a sixth embodiment of the present application, as shown in fig. 11, elements having similar structures and functions as those in the fifth embodiment shown in fig. 9 are denoted by the same reference numerals, and the control manner for the LED strings is the same as that in the fifth embodiment shown in fig. 9. However, in contrast to the fifth embodiment shown in fig. 9, in the sixth embodiment shown in fig. 11, the first terminals of all (N + 1) LED strings LED1 to LED (N + 1) are electrically connected to the first DC terminal DC + via all (N + 1) driving switches Q1 to Q (N + 1), respectively, and the second terminals of all (N + 1) LED strings LED1 to LED (N + 1) are all grounded.

Fig. 12 is a schematic circuit configuration diagram of the LED switching system of 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 drive 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. First ends of the two LED strings LED1 and LED2 are electrically connected to the first DC terminal DC + via the driving switches Q1 and Q2, respectively, and second ends of the two LED strings LED1 and LED2 are both grounded.

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

In practical applications, an appropriate implementation mode of the switching circuit can be selected according to requirements. For example, when the switching circuit in the first or second embodiment is used in an ultra-high power LED lamp with a kilowatt or higher, a relay with a high withstand voltage is required, which leads to a significant increase in cost.

In addition, the internal control circuit 158 in the embodiment shown in fig. 9 to 12 includes many possible implementation modes, the internal control circuit 158 in fig. 10 is illustrated below, and only the internal control circuit 158 and the driving switches Q1 and Q2 are shown in the figure for simplicity.

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 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 two ends of the switch 155 are electrically connected to the first power supply terminal VCC1 and the transmitter 156 of the isolator OC1, respectively. The changeover switch 155 is turned on when the coil 154 is energized, and turned off when the coil 154 is not energized. 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, and when the transmitter 156 corresponding to the receiver 157 receives the first voltage through the conduction of the 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, relay RY1 in fig. 13A may be replaced with a driver 159. Two ends 159a and 159b 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. Driver 159 is configured to control 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 two ends 154a and 154b of the coil 154 are electrically connected to the control switch SW1 and the third phase terminal L3, respectively, one end of the switch 155 is electrically connected to the first power supply terminal VCC1 and one end of 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 changeover switch 155 is turned on when the coil 154 is energized, and 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 is used for controlling the switching states of the driving switches Q1 and Q2.

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

It is understood that the various possible implementations of the internal control circuitry 158 of fig. 10 illustrated in fig. 13A-13D are also applicable to the internal control circuitry 158 of fig. 9, 11, and 12. In the case where the number of control switches is N, the number of drive switches and LED strings is N +1, and in the case of the implementation shown in fig. 13A, the number of relays and isolators is N, and the number of internal controllers is 1; in the implementation shown in fig. 13B, the number of drivers and isolators is N, and the number of internal controllers is 1; when the implementation mode shown in fig. 13C is adopted, the number of relays is N, and the number of internal controllers is 1; in the implementation shown in fig. 13D, the number of internal controllers is 1.

In summary, the present application provides an LED switching system, which uses a smaller number of switches to switch on a plurality of LED strings, and is simple in wiring and easy to control; and the switch is only used for driving signals, and the switch with smaller rated current specification can be selected, so that the occupied space is small, and the cost is lower. In addition, the implementation mode of the switching circuit can be properly adopted according to the actual requirement, so that the applicability of the LED switching system is improved.

It should be noted that the above-mentioned embodiments illustrate only preferred embodiments of the present application, and that the present application is not limited to these embodiments, but rather the scope of the present application is defined by the appended claims. And that the present application may be modified in various ways by those skilled in the art without departing from the scope of the appended claims.

Claims

1. 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 for respectively providing three phase voltages, the LED switching system comprising:

a control unit, electrically connected to the first phase terminal of the three-phase power supply device, and including N control switches, where N is a positive integer; and

a light emitting module comprising a light emitting unit, wherein the light emitting unit comprises a power circuit, (N + 1) LED strings and a switching circuit which are electrically connected with each other; the power circuit is also electrically connected to any two of the three phase terminals of the three-phase power supply device and provides a power supply voltage to the (N + 1) LED strings; the switching circuit is also electrically connected to the second phase end or the third phase end of the three-phase power supply device, and the switching circuit is also electrically connected to the control unit to switch according to the on-off states of the N control switches so as to conduct the LED strings corresponding to the control switches.

2. The LED switching system according to claim 1, wherein the power circuit comprises two AC terminals electrically connected to any two of the phase terminals of the three-phase power supply device, a first DC terminal for providing the power voltage, and a second DC terminal connected to ground.

3. The LED switching system according to claim 2, wherein the switching circuit comprises N relays electrically connected to the N control switches, respectively, each of the relays comprises a coil and a switch, two ends of the coil are electrically connected to the control switch corresponding to the relay and the second phase terminal or the third phase terminal, respectively, the switch comprises a first contact, a second contact and a third contact, the third contact is electrically connected to the second contact and the first contact when the coil is powered on and off; the first ends of the (N + 1) LED strings are electrically connected to the first direct current end, the second end of the 1 st LED string is electrically connected to the first contact of the 1 st relay, the second ends of the 2 nd to (N + 1) th LED strings are electrically connected to the second contacts of the 1 st to nth relays respectively, the first contacts of the 2 nd to nth relays are electrically connected to the third contacts of the 1 st to (N-1) th relays respectively, and the third contact of the nth relay is grounded.

4. The LED switching system according to claim 2, wherein the switching circuit comprises N relays electrically connected to the N control switches, respectively, each of the relays comprises a coil and a switch, two ends of the coil are electrically connected to the control switch corresponding to the relay and the second phase terminal or the third phase terminal, respectively, the switch comprises a first contact, a second contact and a third contact, the third contact is electrically connected to the second contact and the first contact when the coil is powered on and off; the third contact of the 1 st relay is electrically connected to the first DC end, the third contacts of the 2 nd to Nth relays are electrically connected to the first contacts of the 1 st to (N-1) th relays, respectively, the first contact of the Nth relay is electrically connected to the first end of the 1 st LED string, the first ends of the 2 nd to (N + 1) th LED strings are electrically connected to the second contacts of the 1 st to Nth relays, respectively, and the second ends of the (N + 1) th LED strings are all grounded.

5. The LED switching system of claim 2 wherein the power circuit further comprises a first power terminal and a second power terminal for providing a first voltage and a second voltage, respectively; the switching circuit comprises an internal control circuit and (N + 1) driving switches, wherein the internal control circuit is electrically connected to the N control switches, the second phase end or the third phase end and the (N + 1) driving switches, the first ends of the (N + 1) LED strings are electrically connected to the first direct current end, and the second ends of the (N + 1) LED strings are respectively electrically connected to the (N + 1) driving switches; when the N control switches are all turned off, the internal control circuit controls the 1 st driving switch to be turned on, so that the 1 st LED string is turned on, and when the nth control switch is turned on, the internal control circuit controls the (N + 1) th driving switch to be turned on, so that the (N + 1) th LED string is turned on, wherein N is a positive integer less than or equal to N.

6. The LED switching system of claim 2 wherein the power circuit further comprises a first power terminal and a second power terminal for providing a first voltage and a second voltage, respectively; the switching circuit comprises an internal control circuit and (N + 1) driving switches, wherein the internal control circuit is electrically connected to the N control switches, the second phase end or the third phase end and the (N + 1) driving switches, the first ends of the (N + 1) LED strings are electrically connected to the first direct current end through the (N + 1) driving switches respectively, 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 1 st driving switch to be turned on to enable the 1 st LED string to be turned on, and when the nth control switch is turned on, the internal control circuit controls the (N + 1) th driving switch to be turned on to enable the (N + 1) th LED string to be turned on, wherein N is a positive integer less than or equal to N.

7. The LED switching system according to claim 5 or 6, wherein the internal control circuit comprises N relays, N isolators and an internal controller; the N relays are respectively and electrically connected with the N control switches, and the N isolators are respectively and electrically connected with the N relays; each relay comprises a coil and a change-over switch, two ends of the coil are respectively and electrically connected with the control switch corresponding to the relay and the second phase end or the third phase end, two ends of the change-over switch are respectively and electrically connected with the first power supply end and the transmitter corresponding to the isolator, and the change-over switch is switched on when the coil is electrified and switched off when the coil is not electrified; two ends of the receiver of each isolator are respectively electrically connected to the second power supply end and the internal controller, and the internal controller is electrically connected to the (N + 1) driving switches and is used for controlling the on-off state of the (N + 1) driving switches.

8. The LED switching system according to claim 5 or 6, wherein the internal control circuit comprises N drivers, N isolators, and an internal controller; each driver is respectively and electrically connected with the second phase end or the third phase end and the corresponding control switch, and the N isolators are respectively and electrically connected with the N drivers; each driver is also electrically connected to the first power supply end and the transmitter of the corresponding isolator, two ends of the receiver of each isolator are respectively electrically connected to the second power supply end and the internal controller, and the internal controller is electrically connected to the (N + 1) driving switches and is used for controlling the on-off state of the (N + 1) driving switches.

9. The LED switching system according to claim 5 or 6, wherein the internal control circuit comprises N relays and an internal controller, the N relays being electrically connected to the N control switches, respectively; each relay comprises a coil and a change-over switch, wherein two ends of the coil are respectively and electrically connected with the control switch corresponding to the relay and the second phase end or the third phase end, one end of the change-over switch is electrically connected with the second power supply end and one end of the internal controller, the other end of the change-over switch is electrically connected with the other end of the internal controller, and the change-over switch is switched on when the coil is electrified and switched off when the coil is not electrified; the internal controller is electrically connected to the (N + 1) driving switches and is used for controlling the on-off state of the (N + 1) driving switches.

10. The LED switching system according to claim 5 or 6, wherein the internal control circuit comprises an internal controller electrically connected to the N control switches, the second phase terminal or the third phase terminal, and the (N + 1) driving switches, and configured to control the on/off states of the (N + 1) driving switches.

11. The LED switching system according to claim 1, wherein the light emitting module comprises a plurality of light emitting units electrically connected to the control unit and the three-phase power supply device, respectively.

12. The LED switching system according to claim 1, wherein the LED switching system comprises a plurality of the control units and a plurality of the light emitting modules in one-to-one correspondence.

13. The LED switching system of claim 1 wherein each of the LED strings comprises a plurality of LEDs connected in series.

14. 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.