Multi-channel switching dimming control circuit

Abstract

The invention discloses a multi-channel switching dimming control circuit, which comprises a working mode switching circuit and a switch and dimming circuit, and is characterized in that the working mode switching circuit converts the voltage of an external power supply into different driving voltages by utilizing a plurality of DC-DC (Direct Current-Direct Current) conversion ICs (Integrated Circuit) to drive a multi-channel lighting system; the switching and dimming circuit outputs adjustable driving voltage to the multi-path lighting system by utilizing a DC-DC conversion IC (Integrated Circuit) and a potentiometer; according to the invention, through modularized and standardized design, integration and application of various lamps and various functions are realized by using least several circuits, illumination control equipment is greatly simplified, and equipment reliability, supportability and man-machine work efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of lighting systems, and in particular to a multi-channel switching dimming control circuit. Background Art

[0002] With the continuous expansion of the application field of LED lamps, the demand for dimming and color-adjusting LED lamps is increasing. Especially in some special places, there are various dimming lamp products, which put forward strict integration requirements for the functions of control equipment. For example, in a certain aircraft platform, the controller provides switch, drive and dimming control for the lighting equipment and light guide plates in the cabin lighting system. In other application fields such as ships and submarines, there are similar integration requirements.

[0003] Airborne lighting systems are now divided into multiple independent subsystems according to their functions and uses, each with its own control device. Each independent subsystem is designed and manufactured by different manufacturers, and its installation interface, electrical interface, human-machine interface, etc. are all different, and the dimming control methods are also different, which brings great challenges to the design of airborne platforms and the use of lighting systems. Traditional controllers are similar to airborne platform lighting subsystem controllers, which are only applicable to ceiling lighting systems and cannot control lighting systems in other areas or for other purposes, such as signal lights, operating table lights, and instrument panel light guide lighting. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a multi-channel switching dimming control circuit. The present invention realizes the integration and application of multiple lamps and multiple functions through modular and standardized design using a minimum of several circuits, greatly simplifies the lighting control equipment, and improves the equipment reliability, security and ergonomics.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-channel switching dimming control circuit, including an operating mode switching circuit and a switch and dimming circuit, wherein the operating mode switching circuit uses multiple DC-DC conversion ICs to convert the voltage of an external power supply into different driving voltages to drive a multi-channel lighting system, and the switch and dimming circuit uses a DC-DC conversion IC and a potentiometer to output an adjustable driving voltage to the multi-channel lighting system.

[0006] As a further improvement of the present invention, the working mode switching circuit includes a DC-DC conversion IC U1 and a DC-DC conversion IC U2, the external power supply is connected to the input ends of the DC-DC conversion IC U1 and the DC-DC conversion IC U2 respectively through a relay K1, the output ends of the DC-DC conversion IC U1 and the DC-DC conversion IC U2 are connected to the switch MOS tube Q11, and the switch MOS tube Q11 is connected to a normally closed switch S1, and the normally closed switch S1 is used to control the conduction or closing of the switch MOS tube Q11.

[0007] As a further improvement of the present invention, the switch and dimming circuit includes a DC-DC converter IC U3, the external power supply is connected to the relay K2 and the input end of the DC-DC converter IC U3 respectively through the switch S1, the relay K2 is used to directly output the external power supply, and is connected to the output end of the working mode switching circuit through the switch MOS tube Q21; a potentiometer RX31A is provided between the output end and the adjustment end of the DC-DC converter IC U3, and the DC-DC converter IC U3 is controlled to output an adjustable voltage signal by adjusting the resistance value of the potentiometer RX31A.

[0008] As a further improvement of the present invention, it also includes a driving voltage conversion circuit, which includes a PWM signal generating IC U4. The external power supply is respectively connected to the power supply end of the relay K4 and the PWM signal generating IC U4 through a switch S4. The output ends of the relay K4 and the PWM signal generating IC U4 are respectively connected to the switch MOS tube Q41. The PWM signal generating IC U4 is connected to a potentiometer RX41A. By adjusting the resistance value of the potentiometer RX41A, the duty cycle of the PWM signal generating IC U4 is controlled, thereby outputting an adjustable driving voltage.

[0009] The beneficial effects of the present invention are:

[0010] 1. In order to solve the problem that the existing controller has a single purpose and cannot control and adjust other lighting systems, the present invention proposes a multi-channel switching dimming control technology that integrates multiple functions and uses, so that one control device can control all the above-mentioned lighting devices on and off, switch modes, adjust brightness, etc., to meet the requirements of integration, simplification and lightweight of airborne lighting systems.

[0011] 2. The present invention realizes the integration and application of multiple lamps and multiple functions by modularizing and standardizing the design and using a minimum of several circuits, which greatly simplifies the lighting control equipment and improves the reliability, security and ergonomics of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is an overall circuit diagram of an embodiment of the present invention;

[0013] Figure 2 A circuit diagram of a ceiling light working mode switching circuit in an embodiment of the present invention;

[0014] Figure 3 A circuit diagram of a ceiling light switch and a dimming circuit in an embodiment of the present invention;

[0015] Figure 4 FIG. 4 is a circuit diagram of a driving voltage conversion circuit in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0017] Example

[0018] A multi-channel switching dimming control circuit is a circuit that realizes the control of a multi-way lighting system. This embodiment is based on the lighting requirements of a certain aircraft cabin, and is an integrated design of a multi-channel switching dimming control circuit with switch control, mode switching and dimming functions for lighting equipment such as the upper cabin ceiling light, the second floor floor ceiling light, the left and right mooring lights, the signal light, the operating table lamp and the instrument light guide plate.

[0019] The principle of multi-channel switching dimming control circuit is as follows Figure 1 As shown, the multi-channel switching dimming control circuit mainly includes the upper cabin three-mode ceiling light and second-floor floor light control circuit, the operating table lighting control circuit, the signal light control circuit and the light guide plate control circuit.

[0020] The upper cabin ceiling light and the second floor floor light have the same function. The DC28V power is input into the cargo hold dimming controller. After the power switching circuit, the DC28V power is directly output to the three-mode ceiling light, the relevant circuit modules inside the dimming controller and the subsequent lighting equipment to provide normal working power. The dimming controller operation panel has the upper cabin light, the second floor floor light, the operating table lighting, the signal light, the light guide plate, the moored lighting switch and the dimming knob. The corresponding switch dimming module inside is controlled by the switch or the dimming knob to convert the DC28V into the corresponding driving voltage.

[0021] For the upper cabin ceiling lights and second floor floor lights, which are functionally the same, the circuits of their switch modules and 10V voltage conversion modules are the same, and they share the same working mode switching circuit. The dimming controller receives the open / grounded working mode signal from the external input and the infrared mode switch signal from the operation panel. The working mode switching circuit converts DC28V into the working mode signal voltage required by the upper cabin lights and second floor floor lights, that is, it outputs three states of 0V, 5V and 12V, and provides working mode selection voltage for the upper cabin lights and second floor floor lights. The switch module outputs DC28V main power supply, providing DC28V normal working voltage for the upper cabin lights and second floor floor lights. The 10V voltage conversion module outputs 0-10V voltage, and the 10V voltage conversion circuit is adjusted by the dimming knob on the operation panel to provide 0V-10V analog dimming voltage signal for the upper cabin lights and second floor floor lights, realizing the function of adjusting the brightness of the ceiling lights.

[0022] The switch switching module of the left mooring light is the same as that of the right mooring light, which outputs DC28V main power supply. The mooring light is turned on and off by the button switch on the operation panel.

[0023] The switch module and dimming module circuits of the signal light and light guide plate are the same. The switch module is controlled on and off by the knob switch of the corresponding device on the operation panel. The driving voltage is adjusted within the range of 0-28V by the knob to adjust the brightness of the corresponding device.

[0024] The brightness of the operating table lighting is controlled by a potentiometer voltage divider.

[0025] The signal light switch module is controlled by the light detection switch button to detect the working status of the signal light.

[0026] The control circuit includes three main circuit modules: ceiling light working mode switching circuit, ceiling light switch and dimming circuit, operating table lighting and light guide plate driving voltage conversion circuit.

[0027] The principle of the ceiling light working mode switching circuit is as follows Figure 2As shown, in the working mode switching circuit of the upper cabin light and the second floor floor light, the core components are two DC-DC conversion ICs, U1 and U2, which are used to convert 28V to 12V and 5V. K1 is a single-pole double-throw relay, S1 is an infrared mode switch button, and Q11 is a switch MOS transistor. The working principle is that the external input open circuit / ground working mode voltage controls the closing point of K1 to select a certain voltage conversion circuit. When the working mode voltage is open circuit, K1 is connected to the 12V conversion circuit, and when the working mode is grounded, K1 is connected to the 5V conversion circuit. The 12V and 5V conversion circuits are connected to the switch MOS together, and S1 controls the conduction or shutdown. S1 is a normally closed switch, the MOS switch is normally open, and the output working mode voltage is 12V or 5V. Press the red mode switch, S1 is turned on, and the MOS is disconnected, then the working mode voltage outputs 0V through the pull-down resistor.

[0028] The principle of ceiling light switch and dimming circuit is as follows Figure 3 As shown, in the control circuit of the upper cabin ceiling light and the second floor floor light, the core component U3 is a CW117 DC-DC conversion IC, which converts 28V to 10V. K2 is a single-pole single-throw relay, S2 and RX31A are two functional units of the ceiling light switch knob, and Q21 is a switch MOS. The working principle is that the external input 28V voltage is controlled by S2 to turn K2 on and off to output 28V working voltage to the ceiling light. After K2 is turned on, Q21 is also turned on, and the working mode voltage of 0V, 5V or 12V is output to the ceiling light through MOS. By adjusting the resistance value of the RX31A potentiometer, U3 is controlled to output a voltage of 0V-10V, which is output to the ceiling light as a dimming signal.

[0029] The operating table lighting, light guide plate and signal light use the same control and drive circuit, such as Figure 4 As shown in the figure, in the operating table lighting, light guide plate and signal light driving circuit, U4 is a PWM signal generating IC, K4 is a single-pole single-throw relay, S4 and RX41A are two functional units of the switch knobs corresponding to the operating table lighting, light guide plate and signal light, and Q41 is a MOS switch. The working principle is that the external input 28V voltage is controlled by S4 to turn K4 on and off to output 28V working voltage to the operating table lighting, light guide plate and signal light. U4 is a 555 chip. Through RX41A, the PWM signal with a duty cycle of 0-100% can be adjusted at the third pin of U4. Q41 is turned on and off according to the PWM signal, and the driving voltage output to the lamp is the 28V voltage of the PWM signal. By designing the resistance value of R44 and the potentiometer, the output PWM voltage duty cycle can be set to 0-100% or 9%-100%, that is, the dimming voltage is 0-28V or 9V-28V.

[0030] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A multi-channel switching dimming control circuit, characterized in that: It includes a working mode switching circuit and a switch and dimming circuit. The working mode switching circuit uses multiple DC-DC conversion ICs to convert the voltage of an external power supply into different driving voltages to drive a multi-channel lighting system. The switch and dimming circuit uses a DC-DC conversion IC and a potentiometer to output an adjustable driving voltage to the multi-channel lighting system.

2. The multi-channel switching dimming control circuit according to claim 1, characterized in that: The working mode switching circuit includes a DC-DC conversion IC U1 and a DC-DC conversion IC U2. The external power supply is connected to the input ends of the DC-DC conversion IC U1 and the DC-DC conversion IC U2 respectively through a relay K1. The output ends of the DC-DC conversion IC U1 and the DC-DC conversion IC U2 are connected to a switch MOS tube Q11. A normally closed switch S1 is connected to the switch MOS tube Q11. The normally closed switch S1 is used to control the conduction or closing of the switch MOS tube Q11.

3. The multi-channel switching dimming control circuit according to claim 2, characterized in that: The switch and dimming circuit includes a DC-DC converter IC U3. The external power supply is connected to the relay K2 and the input end of the DC-DC converter IC U3 respectively through the switch S1. The relay K2 is used to directly output the external power supply and is connected to the output end of the working mode switching circuit through the switch MOS tube Q21. A potentiometer RX31A is provided between the output end and the adjustment end of the DC-DC converter IC U3. By adjusting the resistance value of the potentiometer RX31A, the DC-DC converter IC U3 is controlled to output an adjustable voltage signal.

4. The multi-channel switching dimming control circuit according to any one of claims 1 to 3, characterized in that: It also includes a driving voltage conversion circuit, which includes a PWM signal generating IC U4. The external power supply is connected to the power supply end of the relay K4 and the PWM signal generating IC U4 respectively through a switch S4. The output ends of the relay K4 and the PWM signal generating IC U4 are respectively connected to the switch MOS tube Q41. The PWM signal generating IC U4 is connected to a potentiometer RX41A. By adjusting the resistance value of the potentiometer RX41A, the duty cycle of the PWM signal generating IC U4 is controlled, thereby outputting an adjustable driving voltage.

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