Control circuit of lamp group and lamp equipment

Abstract

The embodiment of the utility model discloses a control circuit of a lamp group and lamp equipment. The control circuit of the lamp group comprises a centralized boost power supply which is used for connecting an input power supply, boosting the voltage of the input power supply and outputting a first voltage; the centralized boost power supply is connected with the at least one constant-current dimming module, and the constant-current dimming module is used for being connected with a lamp set and outputting current to the constant-current dimming module; and the dimming controller is connected with the centralized boost power supply and the constant-current dimming module, and the dimming controller is used for controlling the first voltage output by the centralized boost power supply and adjusting the current output by the constant-current dimming module to the lamp group. According to the technical scheme provided by the embodiment of the invention, the problems of high wiring cost, dispersed heat sources and high control cost of the existing dimming method of the lamp are solved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of lighting control, and in particular to a control circuit for a lamp group and a lighting device. Background Art

[0002] In the application scenario of plant lighting, a large number of LED lamps are required to be used together. Using a large number of lamps together brings inconvenience to the power supply, wiring, and dimming of the power source. The existing dimming schemes for LED lamps have problems such as high wiring costs, scattered heat sources, and high control costs. Summary of the Utility Model

[0003] The embodiments of the present utility model provide a control circuit for a lamp group and a lighting device to solve the problems of high wiring costs, scattered heat sources, and high control costs in the dimming scheme of LED lamps.

[0004] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0005] The embodiments of the present utility model provide a control circuit for a lamp group, including:

[0006] A centralized boost power supply, configured to be connected to an input power supply, boost the voltage of the input power supply, and output a first voltage;

[0007] At least one constant-current dimming module, the centralized boost power supply is connected to at least one of the constant-current dimming modules, and the constant-current dimming module is configured to be connected to a lamp group and output current to the constant-current dimming module;

[0008] A dimming controller, connected to the centralized boost power supply and the constant-current dimming module, the dimming controller is configured to control the first voltage output by the centralized boost power supply and adjust the current output by the constant-current dimming module to the lamp group.

[0009] Optionally, the dimming controller includes:

[0010] A DC-DC module, connected to the centralized boost power supply, the DC-DC module is configured to step down the first voltage and output a second voltage;

[0011] A voltage dividing unit, connected to the output end of the centralized boost power supply, the voltage dividing unit is configured to divide the first voltage and output a third voltage;

[0012] A control unit, connected to the DC-DC module and the voltage dividing unit, the second voltage is used to supply power to the control unit; the control unit is configured to adjust the current output by the constant-current dimming module according to the third voltage.

[0013] Optionally, the voltage dividing unit includes:

[0014] The first resistor and the second resistor;

[0015] The first end of the first resistor is connected to the output end of the centralized boost power supply. The second end of the first resistor is connected to the first end of the second resistor and the sampling end of the control unit. The second end of the second resistor is connected to the ground end.

[0016] Optionally, the constant-current dimming module includes:

[0017] A switching unit and a rectifying unit;

[0018] The first end of the switching unit is connected to the first end of the rectifying unit. The second end of the switching unit is connected to the ground end. The control end of the switching unit is connected to the output end of the control unit. The switching unit is configured to conduct or turn off according to the control of the control unit. The control unit is configured to adjust the switching frequency of the switching unit;

[0019] The second end of the rectifying unit is connected to the second pole of the lamp group. The first pole of the lamp group is connected to the output end of the centralized boost power supply. The rectifying unit is configured to rectify.

[0020] Optionally, the constant-current dimming module further includes:

[0021] A freewheeling unit, which is connected between the output end of the centralized boost power supply and the first end of the switching unit. The freewheeling unit is configured to freewheel.

[0022] Optionally, the freewheeling unit includes a freewheeling diode. The anode of the freewheeling diode is connected to the first end of the rectifying unit. The cathode of the freewheeling diode is connected to the output end of the centralized boost power supply;

[0023] The switching unit includes a metal oxide transistor;

[0024] The rectifying unit includes a rectifying inductor.

[0025] Optionally, the constant-current dimming module further includes:

[0026] A filtering unit, which is connected between the first pole and the second pole of the lamp group. The filtering unit is configured to filter.

[0027] Optionally, the constant-current dimming module further includes:

[0028] A detection resistor. The first end of the detection resistor is connected to the second end of the switching unit and the detection end of the control unit. The second end of the detection resistor is configured to be connected to the ground end. The detection resistor is configured to detect the output current of the constant-current dimming module;

[0029] The control unit is configured to adjust the control parameters of the control unit according to the output current detected by the detection resistor.

[0030] Optionally, the lamp group includes at least two LED lamp strings; each LED lamp string includes at least one LED lamp connected in series; the anodes of the LED lamp strings are connected to the output terminal of the centralized boost power supply, and the cathodes of the LED lamp strings are connected to the output terminal of the constant current dimming module.

[0031] According to another aspect of the present application, an embodiment of the present invention provides a lighting device, including: at least one lamp group and the control circuit of the lamp group proposed in any item of the first aspect, the control circuit of the lamp group is connected to at least one of the lamp groups, and the control circuit of the lamp group is configured to output a current to the lamp group to drive the lamp group to emit light.

[0032] The control circuit of the lamp group provided by the embodiment of the present invention supplies power to at least one lamp group through a centralized boost power supply, improving the power supply efficiency, reducing the wiring cost of the control circuit of the lamp group, making the heat sources more concentrated and facilitating centralized heat dissipation. By setting the constant current dimming module to be connected to the centralized boost power supply, the constant current dimming module can adjust the current of the lamp group connected thereto according to the control of the dimming controller, facilitating the control of at least one lamp group by one dimming controller and reducing the control cost of the lamp group. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description in the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0034] Figure 1 is a schematic structural diagram of a control circuit of a lamp group provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of another control circuit of a lamp group provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0037] Based on the above technical problems, the following solutions are proposed in this embodiment:

[0038] Figure 1 It is a schematic structural diagram of a control circuit for a lamp group provided by an embodiment of the present utility model. Refer to Figure 1 The control circuit for the lamp group provided by the embodiment of the present utility model includes: a centralized boost power supply 1, which is used to connect to an input power supply 10, boost the voltage of the input power supply 10, and output a first voltage; at least one constant-current dimming module 2, the centralized boost power supply 1 is connected to at least one constant-current dimming module 2, and the constant-current dimming module 2 is used to connect to a lamp group 20 and output current to the constant-current dimming module 2; a dimming controller 3, which is connected to the centralized boost power supply 1 and the constant-current dimming module 2, and the dimming controller 3 is used to control the first voltage output by the centralized boost power supply 1 and adjust the current output by the constant-current dimming module 2 to the lamp group 20.

[0039] Specifically, the lamp group 20 may include an LED series-parallel lamp group 20. Multiple lamp groups 20 can be powered by the centralized boost power supply 1. The centralized boost power supply 1 can rectify, filter, and boost the input three-phase AC power supply 10 and then output a DC constant voltage of 0 - 1000V, and the output voltage can be controlled by the dimming controller 3. The power range of the centralized boost power supply 1 includes 10KW, 20KW, or 40KW, etc. The dimming controller 3 mainly outputs an adjustment signal to adjust the output voltage within the range of 0 - 1000V.

[0040] The constant-current dimming module 2 can detect the output voltage of the centralized boost power supply 1, and can increase the constant-current output power supply 10 supplied to the lamp group 20 according to the series-parallel lamp group 20 of the lamp group 20. The constant-current dimming module 2 can adjust the supply current of the lamp group 20 according to the detected voltage change of the centralized boost power supply 1 and adjust the brightness of the lamp group 20.

[0041] The control circuit for the lamp group provided by the embodiment of the present utility model centrally supplies power to at least one lamp group 20 through the centralized boost power supply 1, improves the power supply efficiency, reduces the wiring cost of the control circuit of the lamp group 20, makes the heat source more concentrated, and is convenient for centralized heat dissipation. By setting the constant-current dimming module 2 to be connected to the centralized boost power supply 1, the constant-current dimming module 2 can adjust the current of the lamp group 20 connected thereto according to the control of the dimming controller 3, which is convenient for controlling at least one lamp group 20 through one dimming controller 3 and reduces the control cost of the lamp group 20.

[0042] Optionally, Figure 2 It is a schematic structural diagram of another control circuit for a lamp group provided by an embodiment of the present utility model. On the basis of the above embodiment, refer to Figure 2, the dimming controller 3 may include: a DC-DC module 31 connected to the centralized boost power supply 1, where the DC-DC module 31 is used to step down the first voltage and output a second voltage; a voltage dividing unit 32 connected to the output terminal of the centralized boost power supply 1, where the voltage dividing unit 32 is used to divide the first voltage and output a third voltage; a control unit 33 connected to the DC-DC module 31 and the voltage dividing unit 32, and the second voltage is used to supply power to the control unit 33; the control unit 33 is used to adjust the current output by the constant current dimming module 2 according to the third voltage.

[0043] Specifically, the control unit 33 may include a single-chip microcomputer, a FPGA (Field-Programmable Gate Array), and other controllers. Since the power supply voltage of the dimming controller 3 is different from the voltage level of the first voltage output by the centralized boost power supply 1. The DC-DC module 31 steps down the first voltage and outputs a second voltage. The voltage level of the second voltage is lower than that of the first voltage. The voltage dividing unit 32 divides the first voltage output by the centralized boost power supply 1 and outputs a third voltage after voltage division. The control unit 33 may generate a first control signal according to the third voltage. The first control signal is used to adjust the current output by the constant current dimming module 2. The greater the current output by the constant current dimming module 2, the higher the brightness of the lamp group 20. By adjusting the magnitude of the current output by the constant current dimming module 2, the brightness of the lamp group 20 can be adjusted.

[0044] Optionally, based on the above embodiments, continue to refer to Figure 2 , the voltage dividing unit 32 may include: a first resistor R1 and a second resistor R2; a first end of the first resistor R1 is connected to the output terminal of the centralized boost power supply 1, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a sampling terminal of the control unit 33, and a second end of the second resistor R2 is connected to the ground terminal.

[0045] Specifically, the resistance value of the first resistor R1 and the resistance value of the second resistor R2 may be the same or different. The resistance value of the first resistor R1 may be set according to the voltage division requirement.

[0046] Optionally, based on the above embodiments, continue to refer to Figure 2 , the constant current dimming module 2 includes: a switching unit 21 and a rectifying unit 22; a first end of the switching unit 21 is connected to a first end of the rectifying unit 22, a second end of the switching unit 21 is connected to the ground terminal, a control end of the switching unit 21 is connected to an output terminal of the control unit 33, and the switching unit 21 is used to conduct or turn off according to the control of the control unit 33; the control unit 33 is used to adjust the switching frequency of the switching unit 21; a second end of the rectifying unit 22 is connected to a second pole of the lamp group 20, and a first pole of the lamp group 20 is connected to the output terminal of the centralized boost power supply 1, and the rectifying unit 22 is used for rectification.

[0047] Specifically, when the switch unit 21 is turned on, the first voltage output by the centralized boost power supply 1 supplies power to the lamp group 20. The lamp group 20, the rectification unit 22, and the turned-on switch unit 21 form a loop. When the switch unit 21 is turned off, the lamp group 20 does not emit light. The control unit 33 realizes the brightness adjustment of the lamp group 20 by adjusting the switching frequency of the switch unit 21 and through the rectification effect of the rectification unit 22. Since the dimming controller 3 can be connected to at least two constant-current dimming modules 2, at least two constant-current dimming modules 2 can share one dimming controller 3, which can not only realize the dimming of the lamp group 20 but also reduce the control cost of the lamp group 20.

[0048] Optionally, based on the above embodiments, continue to refer to Figure 2 , the constant-current dimming module 2 further includes a freewheeling unit 23. The freewheeling unit 23 is connected between the output terminal of the centralized boost power supply 1 and the first terminal of the switch unit 21, and the freewheeling unit 23 is used for freewheeling.

[0049] Specifically, since the rectification unit 22 is an inductive load. The freewheeling unit 23 is used to prevent the high-voltage spikes generated by the inductive load when the current changes, and protect other components in the circuit from damage. When the current of the inductive load suddenly changes, such as the on / off of the switch unit 21, a mutated voltage will be generated at both ends of the inductive load. This mutated voltage may be very high, thus damaging other circuit components. By connecting the freewheeling unit 23 in parallel across the inductive load, when the current changes, a loop is formed through the freewheeling unit 23, enabling the current to change smoothly, thereby avoiding the occurrence of surge voltage.

[0050] Optionally, based on the above embodiments, continue to refer to Figure 2 , the freewheeling unit 23 includes a freewheeling diode. The anode of the freewheeling diode is connected to the first terminal of the rectification unit 22, and the cathode of the freewheeling diode is connected to the output terminal of the centralized boost power supply 1; the switch unit 21 includes a metal oxide transistor; the rectification unit 22 includes a rectification inductor.

[0051] Specifically, on the one hand, the freewheeling diode can prevent voltage spikes. When the current in the rectifying inductor changes suddenly, a back electromotive force will be generated across the rectifying inductor, and this voltage may be very high, damaging other circuit components. The freewheeling diode forms a loop to release this part of the energy, thus preventing voltage spikes. On the other hand, the freewheeling diode can protect the switching unit 21. The freewheeling diode can protect the switching unit 21 from high voltages during conduction and cutoff, avoiding breakdown of the switching unit 21. In addition, the freewheeling diode can also smooth the current. Through the freewheeling diode, the current can change more smoothly, avoiding sudden changes that cause voltage spikes and protecting other components in the control circuit of the lamp group 20 from damage, improving the safety and stability of the control circuit of the lamp group 20.

[0052] Optionally, based on the above embodiments, continue to refer to Figure 2 , the constant current dimming module 2 further includes: a filtering unit 24, the filtering unit 24 is connected between the first pole and the second pole of the lamp group 20, and the filtering unit 24 is used for filtering.

[0053] Specifically, the main function of the filtering unit 24 is to remove or reduce noise and interference in the signal, thereby improving the quality of the signal. By selectively allowing signals of certain frequencies to pass through while blocking signals of other frequencies, the filtering unit 24 can purify the current signal driving the lamp group 20. This setting facilitates improving the accuracy and reliability of the current signal driving the lamp group 20.

[0054] Optionally, based on the above embodiments, continue to refer to Figure 2 , the constant current dimming module 2 further includes: a detection resistor R3, the first end of the detection resistor R3 is connected to the second end of the switching unit 21 and the detection end of the control unit 33, the second end of the detection resistor R3 is used to connect to the ground terminal, and the detection resistor R3 is used to detect the output current of the constant current dimming module 2; the control unit 33 is used to adjust the control parameters of the control unit 33 according to the output current detected by the detection resistor R3.

[0055] Specifically, the detection resistor R3 can detect the current flowing through the lamp group 20. The control unit 33 can timely adjust the control parameters output by the control unit 33 according to the current flowing through the lamp group 20 detected by the detection resistor R3, thereby controlling the current output by the constant current dimming module 2 and facilitating real-time adjustment of the brightness of the lamp group 20.

[0056] Optionally, based on the above embodiments, continue to refer to Figure 2 , the lamp group 20 includes at least one LED lamp string; the LED lamp string includes at least one LED lamp connected in series. The anode of the LED lamp string is connected to the output terminal of the centralized boost power supply 1, and the cathode of the LED lamp string is connected to the output terminal of the constant current dimming module 2.

[0057] Specifically, each lamp group 20 may include at least one LED lamp string connected in series. Two adjacent lamp groups 20 may be connected in parallel. Each lamp group 20 may be provided in one-to-one correspondence with the constant current dimming module 2. A plurality of lamp groups 20 may share the same dimming controller 3 and the centralized boost power supply 1.

[0058] This embodiment provides a lighting device. The lighting device provided in this embodiment includes at least one lamp group and the control circuit of the lamp group proposed in any of the above embodiments. The control circuit of the lamp group is connected to at least one lamp group, and the control circuit of the lamp group is configured to output current to the lamp group to drive the lamp group to emit light. Since the lighting device includes the control circuit of the lamp group proposed in any of the above embodiments and has the beneficial effects of the control circuit of the lamp group proposed in any of the above embodiments, they will not be elaborated here.

[0059] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it may also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control circuit for a lamp assembly, characterized in that: include: A centralized boost power supply, used to connect to an input power supply, boost the voltage of the input power supply, and output a first voltage; At least one constant current dimming module, the centralized boost power supply is connected to at least one constant current dimming module, the constant current dimming module is used to connect the lamp group and output current to the constant current dimming module; A dimming controller is connected to the centralized boost power supply and the constant current dimming module, and is used to control the first voltage output by the centralized boost power supply and adjust the current output by the constant current dimming module to the lamp group.

2. The control circuit of the lamp assembly according to claim 1, characterized in that: The dimming controller comprises: A DC-DC module connected to the centralized boost power supply, the DC-DC module is used to step down the first voltage and output a second voltage; A voltage dividing unit connected to the output end of the centralized boost power supply, the voltage dividing unit is used to divide the first voltage and output a third voltage; A control unit is connected to the DC-DC module and the voltage divider unit, and the second voltage is used to supply power to the control unit; the control unit is used to adjust the current output by the constant current dimming module according to the third voltage.

3. The control circuit of the lamp assembly according to claim 2, characterized in that: The voltage dividing unit comprises: a first resistor and a second resistor; The first end of the first resistor is connected to the output end of the centralized boost power supply, the second end of the first resistor is connected to the first end of the second resistor and the sampling end of the control unit, and the second end of the second resistor is connected to the ground end.

4. The control circuit of the lamp assembly according to claim 2 or 3, characterized in that: The constant current dimming module comprises: Switching unit and rectifying unit; The first end of the switch unit is connected to the first end of the rectifier unit, the second end of the switch unit is connected to the ground end, the control end of the switch unit is connected to the output end of the control unit, and the switch unit is used to be turned on or off according to the control of the control unit; the control unit is used to adjust the switching frequency of the switch unit; The second end of the rectifier unit is connected to the second pole of the lamp group, the first pole of the lamp group is connected to the output end of the centralized boost power supply, and the rectifier unit is used for rectification.

5. The control circuit of the lamp assembly according to claim 4, characterized in that: The constant current dimming module further includes: A freewheeling unit is connected between the output end of the centralized boost power supply and the first end of the switch unit, and is used for freewheeling.

6. The control circuit of the lamp assembly according to claim 5, characterized in that: The freewheeling unit comprises a freewheeling diode, an anode of the freewheeling diode is connected to the first end of the rectifying unit, and a cathode of the freewheeling diode is connected to the output end of the centralized boost power supply; The switch unit includes a metal oxide transistor; The rectifying unit includes a rectifying inductor.

7. The control circuit of the lamp assembly according to claim 4, characterized in that: The constant current dimming module further includes: A filter unit is connected between the first pole and the second pole of the lamp group, and is used for filtering.

8. The control circuit of the lamp assembly according to claim 4, characterized in that: The constant current dimming module further includes: A detection resistor, wherein a first end of the detection resistor is connected to a second end of the switch unit and a detection end of the control unit, a second end of the detection resistor is used to connect to the ground end, and the detection resistor is used to detect an output current of the constant current dimming module; The control unit is used to adjust the control parameters of the control unit according to the output current detected by the detection resistor.

9. The control circuit of the lamp assembly according to claim 1, characterized in that: The light group includes at least one LED light string; the LED light string includes at least one LED light connected in series; The anode of the LED light string is connected to the output end of the centralized boost power supply, and the cathode of the LED light string is connected to the output end of the constant current dimming module.

10. A lighting device, characterized in that: include: At least one lamp group and a control circuit for the lamp group according to any one of claims 1 to 9, wherein the control circuit for the lamp group is connected to at least one of the lamp groups, and the control circuit for the lamp group is used to output current to the lamp group to drive the lamp group to emit light.

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