A low-voltage dimming controller and lighting control system

Abstract

The present invention discloses a low-voltage dimming controller and a lighting control system. The low-voltage dimming controller includes a power supply circuit, a dimming circuit, a protection circuit and a signal control unit connection port. The signal control unit connection port is detachable and the signal control unit is set. The present invention can freely set the signal control unit according to different lighting needs, simplifies terminal installation, reduces maintenance costs, and can be widely used in shelf and cabinet lighting control.

Description

Technical Field

[0001] The present invention relates to the field of lighting control, in particular to a low-voltage dimming controller and a lighting control system. Background Art

[0002] With the continuous development of lighting technology, more and more occasions, especially in the field of commercial lighting, such as shopping malls and supermarkets, require large-scale installation of lighting equipment. At this time, the problem of laying lines will arise. A large number of lighting equipment not only require power supply but also dimming control. Therefore, there are many lines, and sometimes there are not enough power sockets. Adding power sockets will increase time and labor costs.

[0003] Therefore, it is very important to make the lighting system more convenient and low-cost to power and control. Summary of the Invention

[0004] In view of this, the present invention provides a low-voltage dimming controller to solve the above technical problems.

[0005] A low-voltage dimming controller includes a power supply circuit, a dimming circuit, and a protection circuit, and further includes:

[0006] Signal control unit connection port, for detachable signal control unit.

[0007] Preferably, it also includes a signal adjustment circuit, which adjusts the signal at the input end so that its voltage meets the requirements of the dimming circuit. The input end is connected to the signal output end of the signal control unit connection port and is provided with a first interconnection interface, and the output end is connected to the dimming circuit and is provided with a second interconnection interface.

[0008] Preferably, the signal adjustment circuit is provided with a comparison circuit, the comparison circuit is provided with a reference signal smaller than the input signal, and the comparison circuit compares the input signal with the reference signal and outputs a high level whose amplitude is determined by the power supply circuit.

[0009] Preferably, the low-voltage dimming controller is provided with a plurality of parallel branch ports for connecting lamps.

[0010] Preferably, the low-voltage dimming controller is provided with a sensor connection port.

[0011] Preferably, the sensor connection port includes an infrared sensor connection port and a human body induction sensor connection port.

[0012] Preferably, the dimming circuit is a two-wire dimming and color adjustment circuit.

[0013] Preferably, the low-voltage dimming controller is provided with a power supply voltage interconnection interface.

[0014] A lighting control system includes a driving power supply and a plurality of low-voltage dimming controllers. The low-voltage dimming controllers are sequentially voltage-interconnected and signal-interconnected. The initial low-voltage dimming controller is connected to the driving power supply and is equipped with a signal control unit.

[0015] A lighting control system includes multiple driving power supplies and the same number of low-voltage dimming controllers as the driving power supplies. The driving power supplies are interconnected in sequence, and the low-voltage dimming controllers are interconnected in sequence. The initial low-voltage dimming controller is equipped with a signal control unit, and each driving power supply is connected to a corresponding low-voltage dimming controller.

[0016] Technical effects of the present invention:

[0017] The low-voltage dimming controller and lighting control system of the present invention realize the signal synchronization problem between multiple LED lighting control systems through the interconnection of dimming control signals, and realize the synchronization of lamp status changes. At the same time, the plug-in method is adopted between different lighting units, which simplifies terminal installation and reduces maintenance costs. It can be widely used in shelf and cabinet lighting control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0019] Figure 1 FIG. 4 is a wireframe structure diagram of the low-voltage dimming controller of this embodiment.

[0020] Figure 2 FIG. 4 is a circuit diagram of the signal adjustment circuit of this embodiment.

[0021] Figure 3 FIG. 4 is a circuit diagram of the dimming circuit of this embodiment.

[0022] Figure 4 FIG. 4 is a wireframe structure diagram of the lighting control system of this embodiment.

[0023] Figure 5 A wireframe diagram of a lighting control system according to another embodiment. DETAILED DESCRIPTION

[0024] The following is a further detailed description of specific embodiments of the present invention based on the accompanying drawings. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0025] like Figures 1 to 5As shown, the low-voltage dimming controller 1000 of this embodiment includes a power supply circuit 100, a dimming circuit 200, a protection circuit 300, a signal control unit connector 400, and a signal adjustment circuit 500. The signal control unit connector 400 is detachably provided with a signal control unit. The signal adjustment circuit 500 adjusts the signal at the input end so that its voltage meets the requirements of the dimming circuit 200. The input end is connected to the signal output end of the signal control unit connector 400 and is provided with a first interconnection interface 501. The output end is connected to the dimming circuit 200 and is provided with a second interconnection interface 502.

[0026] The signal control unit connection port 400 and the signal control unit are detachably provided, which means that they can be connected by a plug-in connector, welding, or screws, that is, a detachable electrical connection can be achieved.

[0027] The low-voltage dimming controller 1000 of this embodiment is provided with a signal control unit connection port 400. The signal control unit is an intelligent control module that can realize functions such as calculation and storage. Generally, a single-chip microcomputer is used. In this embodiment, the low-voltage dimming controller 1000 and the signal control unit are set separately, and a signal adjustment circuit 500 is added, so that lamps can be laid over a large area. When multiple low-voltage dimming controllers 1000 are needed, only one low-voltage dimming controller 1000 is required to be connected to the signal control unit 401, and the rest can obtain control signals by interconnecting and transmitting. The control signals here are mainly dimming signals, including brightness and color temperature. The above-mentioned first interconnection interface 501 and second interconnection interface 502 are used to input and output control signals respectively after the low-voltage dimming controller 1000 and other low-voltage dimming controllers 1000 are interconnected. Because the signal control unit is a peripheral, it is not drawn in the figure.

[0028] The signal conditioning circuit 500 adjusts the input signal so that its voltage meets the requirements of the dimming circuit 200. This ensures that the signal received by the interconnected low-voltage dimming controller 1000 can stably drive the dimming circuit 200 during the interconnection process. The dimming circuit 200 may require different signal voltages depending on the components used. Generally, the input signal voltage must be above 3V.

[0029] In this embodiment, the signal adjustment circuit 500 is provided with a comparison circuit 503 , and the comparison circuit 503 is provided with a reference signal smaller than the input signal. The comparison circuit 503 compares the input signal with the reference signal and outputs a high level whose amplitude is determined by the power supply circuit 100 .

[0030] In any interconnected low-voltage dimming controller 1000, the input signal is connected to the comparison circuit 503 for comparison with a reference signal. When the input signal is greater than the reference signal, the comparison circuit 503 outputs a high level whose amplitude is determined by the supply voltage. The output signal of the comparison circuit 503 is divided into two paths: one is an output signal for interconnection, which is transmitted to the next low-voltage dimming controller 1000 and connected to the input signal of the next low-voltage dimming controller 1000; the other is connected to the dimming circuit 200 of the low-voltage dimming controller 1000 through a resistor. The comparison circuit 503 provides isolation between input and output signals, allowing the signals of the low-voltage dimming controller 1000 to be generated independently, thus eliminating the problems of signal attenuation and drive capability during signal transmission.

[0031] The specific circuit diagram is as follows Figure 2As shown, X9 is the first interconnect interface 501 for the three-wire PWM signal input, including a warm-in PWM control line, a cold-in PWM control line, and a ground line. The warm-in and cold-in PWM signals are split into two paths and input to pins 3 and 5 of op amp N3 (including N3A and N3B), respectively. The amplitudes of the warm-in and cold-in PWM signals are determined by the design. When pins 3 and 5 of N3 are at a low level when the input PWM signal is low, their voltage relative to ground is theoretically 0V. However, in practice, this voltage does not reach absolute 0V. Furthermore, due to the high-impedance input characteristics of the op amp, when exposed to external interference signals, high voltages can easily be applied to these pins, causing the op amp to falsely trigger. R38 and R40 are connected between pins 5 and 3, respectively, to ground, reducing the impedance of pins 5 and 3 to ground and enhancing the op amp's anti-interference capabilities. Since X9 is an exposed interface and susceptible to electrostatic interference, FV6 and FV8 suppress electrostatic interference from X9, thereby preventing damage to the op amp. The R42 and R44 that are connected to the operational amplifier 2 pins are connected in series, are two voltage-dividing resistors, are used for setting the reference voltage of 2 pins, reference voltage can be set according to design, is not a unique fixed value, the power supply that is used to set the reference voltage can also be selected according to design (selecting 12V in the present embodiment), 2 pins are connected to the series connection point of two resistors. 2 pin reference voltages are compared in real time with the voltage of 3 pins, and when 3 pin voltages are higher than 2 pin voltages, 1 pin outputs a high level, and the amplitude of this high level equals the power supply voltage (being 12V in the present embodiment) of operational amplifier. The peripheral circuit architecture of 6 pins is identical with 2 pins, and as previously mentioned, for design convenience, the power supply that is used to set 6 pin reference voltages can also be selected according to design 24V. 1 pin and 7 pins are the output ports of PWM signal, also are a bare port, are easily subject to external electrostatic interference, and FV10 and FV12 can prevent operational amplifier from being damaged by electrostatic discharge. The PWM signals at pins 1 and 7 are connected to the driving poles of the switch tube of the dimming circuit 200. The rising and falling edges of the PWM signal change rapidly, and are prone to oscillation with the distributed parameters on the circuit, thereby causing abnormal switching of the switch tube. R9 and R11 are connected in series in the driving circuit to attenuate the oscillation signal and prevent abnormal switching of the switch tube.

[0032] In order to install and control more lamps, in this embodiment, the low-voltage dimming controller is provided with a plurality of parallel branch ports 600 for connecting lamps.

[0033] In order to further expand the functions, in this embodiment, the low-voltage dimming controller is provided with a sensor connection port 700. Furthermore, in this embodiment, the sensor connection port 700 includes an infrared sensor connection port and a human body induction sensor connection port.

[0034] In this embodiment, the dimming circuit 200 is a two-wire dimming and color adjustment circuit. Figure 3The low-voltage dimming controller 1000 of this embodiment is particularly effective when applied to this type of dimming circuit.

[0035] In this embodiment, the low voltage dimming controller is provided with a power supply voltage interconnection interface 800. When the power is sufficient, only one low voltage dimming controller needs to be connected to the driving power supply, while the others can be powered by the interconnection.

[0036] The lighting control system of this embodiment includes a driving power supply 2000 and a plurality of the low-voltage dimming controllers 1000. The low-voltage dimming controllers 1000 are sequentially voltage-interconnected and signal-interconnected. The initial low-voltage dimming controller 1000 is connected to the driving power supply 2000 and is equipped with a signal control unit.

[0037] A lighting control system according to another embodiment includes a plurality of driving power supplies 2000 and the same number of low-voltage dimming controllers 1000 as the driving power supplies 2000. The driving power supplies 2000 are interconnected in sequence, and the low-voltage dimming controllers 1000 are interconnected in sequence. The initial low-voltage dimming controller 1000 is installed with a signal control unit, and each driving power supply 2000 is connected to a corresponding low-voltage dimming controller 1000 for power supply.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements or improvements within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. A lighting control system, characterized in that: It comprises a plurality of low-voltage dimming controllers (1000), wherein the low-voltage dimming controllers (1000) are interconnected by sequential signals; The low-voltage dimming controller (1000) comprises a power supply circuit (100), a dimming circuit (200), a protection circuit (300), a signal control unit connection port (400), and a signal adjustment circuit; The signal control unit connection port (400) is provided with a detachable signal control unit, the first low-voltage dimming controller is connected to the signal control unit, and the signal control unit connection port (400) is connected to the input end of the signal adjustment circuit; The signal adjustment circuit comprises a first interconnection interface (501), a comparison circuit (503) and a second interconnection interface (502) connected in sequence; A first interconnection interface (501) is provided at the input end of the signal adjustment circuit, the input end being connected to the output end of the signal control unit connection port 400; a second interconnection interface (502) is provided at the output end of the signal adjustment circuit, and is connected to the dimming circuit (200); The first interconnection interface (501) and the second interconnection interface (502) are connected to other low-voltage dimming controllers (1000), and the other low-voltage dimming controllers (1000) obtain control signals through interconnection transmission. The first interconnection interface (501) and the second interconnection interface (502) are used to input and output control signals respectively after the first low-voltage dimming controller and the other low-voltage dimming controller are interconnected; The comparison circuit of one of the interconnected low-voltage dimming controllers is provided with a reference signal that is smaller than the input control signal. The comparison circuit compares the input control signal with the reference signal and outputs a high level whose amplitude is determined by the power supply circuit (100). The output signal of the comparison circuit is divided into two paths, one path is an output signal for interconnection and is transmitted to the other low-voltage dimming controller, and the other path of output signal passes through a resistor and enters the dimming circuit of one of the interconnected low-voltage dimming controllers. The dimming circuit is connected to a plurality of parallel branch ports for connecting lamps.

2. The lighting control system according to claim 1, characterized in that: The low-voltage dimming controller is provided with a sensor connection port (700).

3. The lighting control system according to claim 2, characterized in that: The sensor connection port (700) comprises an infrared sensor connection port and a human body induction sensor connection port.

4. The lighting control system according to claim 1, characterized in that: The dimming circuit (200) is a two-wire dimming and color adjustment circuit.

5. The lighting control system according to claim 1, characterized in that: The low-voltage dimming controller is provided with a power supply voltage interconnection interface (800).

6. The lighting control system according to claim 1, characterized in that: Includes a driver power supply (2000), The low-voltage dimming controllers (1000) are sequentially voltage-interconnected, and the initial low-voltage dimming controller (1000) is connected to the driving power supply (2000) and is equipped with a signal control unit.

7. The lighting control system according to claim 1, characterized in that: It comprises a plurality of driving power supplies (2000), wherein the driving power supplies (2000) are interconnected in sequence, and each driving power supply (2000) is connected to supply power to a corresponding low-voltage dimming controller (1000).

Images