A multi-mode intelligent lighting dimming circuit

Abstract

The utility model discloses a kind of multi-mode intelligent lighting dimming circuit, it includes single-chip microcontroller and input isolation circuit, input isolation circuit is electrically connected single-chip microcontroller, input isolation circuit is electrically connected PWM / analogue dimming mode switching circuit, PWM / analogue dimming mode switching circuit is electrically connected parallel PWM dimming circuit and analogue dimming circuit, PWM dimming circuit and analogue dimming circuit all include voltage trim circuit and include a 10V / 5V level switching circuit, single-chip microcontroller is electrically connected PWM / analogue dimming mode switching circuit and 10V / 5V level switching circuit, 10V / 5V level switching circuit is electrically connected two voltage trim circuits, the trim circuit of PWM dimming circuit is sequentially electrically connected voltage follower, isolation diode, the voltage trim circuit of analogue dimming circuit is sequentially electrically connected low-pass filter, voltage follower and isolation diode, the output end of PWM dimming circuit and analogue dimming circuit is merged and sequentially electrically connected 1.3 times homophasic amplification circuit and output circuit, and output circuit is connected the dimming line of multiple lamps and lanterns by output interface.

Description

Technical Field

[0001] This utility model relates to the field of tunnel lighting technology, and in particular to a multi-mode intelligent lighting dimming circuit. Background Technology

[0002] In the field of tunnel lighting, real-time control of tunnel light brightness is necessary to achieve energy conservation. Traditional dimming control circuits have the following problems: 1. Limited dimming modes: They only support a limited number of dimming modes, possibly only analog dimming (such as analog dimming with a fixed voltage range, but not necessarily covering both 0-5V and 0-10V simultaneously) or PWM dimming. This results in poor adaptability to different luminaire DIM dimming requirements. When the brightness of a new type of energy-saving luminaire needs to be controlled using PWM 10V mode, if the traditional dimming circuit does not support this mode, it cannot achieve the optimal dimming effect of the luminaire; 2. Inconvenient mode switching: Even if traditional dimming circuits have multiple dimming modes, mode switching may require complex hardware modifications or rewiring. For example, when switching from analog dimming mode to PWM dimming mode, some traditional dimming circuits may require replacing specific chips on the circuit board or resoldering circuit connections. This not only increases the difficulty of operation but may also lead to equipment damage or extended debugging time. 2. Limited signal conversion capabilities and single signal conversion method: Traditional dimming circuits often only perform a single type of signal conversion, either converting analog signals into control signals suitable for the lamps or performing simple processing on PWM signals. This single signal conversion method limits its application in different dimming scenarios. In tunnel lighting scenarios with diverse requirements for dimming accuracy and signal type, traditional dimming circuits cannot meet the needs. 3. Lack of effective anomaly handling mechanism and no output anomaly detection: Most traditional dimming circuits do not have dedicated voltage acquisition and detection circuits at the dimming output end, making it impossible to monitor whether the dimming output voltage is within a reasonable range in real time. When the dimming circuit malfunctions, such as component failure causing abnormal output voltage, traditional dimming circuits cannot detect and take timely measures, which may lead to abnormal lamp brightness and affect traffic safety in tunnels. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a multi-mode intelligent lighting dimming circuit to solve the technical problems mentioned in the background art.

[0004] The objective of this utility model is achieved through the following technical solution: A multi-mode intelligent lighting dimming circuit includes a microcontroller and an input isolation circuit. The input isolation circuit is electrically connected to the microcontroller and uses the PWM signal output by the microcontroller as the PWM dimming signal input. The input isolation circuit is also electrically connected to a PWM / analog dimming mode switching circuit. The microcontroller is electrically connected to the PWM / analog dimming mode switching circuit and can send PWM or analog switching signals to it. The PWM / analog dimming mode switching circuit is electrically connected to a parallel PWM dimming circuit and an analog dimming circuit. Both the PWM dimming circuit and the analog dimming circuit include voltage fine-tuning circuits electrically connected to the PWM / analog dimming mode switching circuit. The PWM dimming circuit and the analog dimming circuit together include a 10V / 5V level switching circuit. The microcontroller is electrically connected to the PWM / analog dimming mode switching circuit. The circuit connects to a 10V / 5V level switching circuit and can send a 10V or 5V switching signal to it. The 10V / 5V level switching circuit is electrically connected to two voltage fine-tuning circuits: one providing 10V or 5V to the voltage fine-tuning circuit of the PWM dimming circuit, and the other providing 10V or 5V to the voltage fine-tuning circuit of the analog dimming circuit. The fine-tuning circuit of the PWM dimming circuit is sequentially connected to a voltage follower and an isolation diode. The voltage fine-tuning circuit of the analog dimming circuit is sequentially connected to a low-pass filter, a voltage follower, and an isolation diode. The output terminals of the isolation diodes of the PWM dimming circuit and the analog dimming circuit are combined and then electrically connected to a 1.3x in-phase amplifier circuit. The 1.3x in-phase amplifier circuit is electrically connected to an output circuit, which connects to the dimming lines of multiple lamps through an output interface.

[0005] Furthermore, an abnormal circuit breaking circuit is electrically connected between the output circuit and the output interface, and a voltage sampling circuit is connected to the output terminal of the output circuit. Both the voltage sampling circuit and the abnormal circuit breaking circuit are connected to a microcontroller.

[0006] Furthermore, the abnormal circuit breaker is a relay.

[0007] Furthermore, the output circuit and the abnormal circuit breaking circuit are electrically connected by an ESD protection and clamping circuit.

[0008] The beneficial effects of this utility model are: The multi-mode intelligent lighting dimming circuit proposed in this utility model has four dimming modes: analog 0-5V, analog 0-10V, PWM 5V, and PWM 10V. It can easily select the level mode according to the DIM dimming requirements of different lamps by sending PWM or analog switching signals to the PWM / analog dimming mode switching circuit and sending 10V or 5V switching signals to the 10V / 5V level switching circuit. Moreover, different modes share a single output circuit and output interface, which greatly improves the versatility and flexibility of the circuit and makes it more adaptable.

[0009] The multi-mode intelligent lighting dimming circuit uses the PWM signal output by the microcontroller as the PWM dimming signal input. With the help of a low-pass filter, it can convert the PWM 0-100% into an analog 0-5V or analog 0-10V signal, realizing the simultaneous output of analog and PWM level signals from a single signal input, meeting the dimming signal requirements of different scenarios.

[0010] Equipped with a comprehensive output anomaly handling circuit, the voltage signal is acquired by the voltage acquisition circuit at the output terminal of the output circuit, and the microcontroller determines whether the voltage is within a reasonable range. When the voltage is abnormal, the microcontroller can control the abnormal circuit to disconnect, thus disconnecting the multi-mode intelligent lighting dimming circuit from the lamps. The lamps then operate at maximum brightness, effectively preventing abnormal brightness adjustment of the lamps due to malfunctions in the multi-mode intelligent lighting dimming circuit, and ensuring driving safety in tunnels.

[0011] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the principle of this utility model.

[0013] Figure 2 This is a schematic diagram of the present invention.

[0014] Figure 3 for Figure 2 Enlarged schematic diagram of part A in the middle.

[0015] Figure 4 for Figure 2 Enlarged schematic diagram of section B in the middle.

[0016] Figure 5 for Figure 2 Enlarged schematic diagram of section C.

[0017] Figure 6 for Figure 2 Enlarged schematic diagram of section D in the middle.

[0018] Figure 7 for Figure 2 Enlarged schematic diagram of section E in the middle.

[0019] Figure 8 for Figure 2Enlarged schematic diagram of section F in the middle. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0021] like Figure 1-8 The multi-mode intelligent lighting dimming circuit shown includes a microcontroller that outputs a PWM signal. It also includes an input isolation circuit electrically connected to the microcontroller and using the microcontroller's output PWM signal as the PWM dimming signal input. The input isolation circuit is a conventional existing circuit, such as... Figure 2 and 3 As shown, it consists of resistors R626A, R620A, R621A, R619A, optocoupler U603A, MOSFET Q613A, and MOSFET Q611A. The PWM dimming signal is input through the gate of MOSFET Q613A, driving optocoupler U603A. The isolated signal is inverted through resistors R621A, R619A, and Q611A and output to the next stage circuit, the PWM / analog dimming mode switching circuit. The PWM / analog dimming mode switching circuit is electrically connected to the input isolation circuit. The microcontroller is electrically connected to the PWM / analog dimming mode switching circuit and can send PWM or analog switching signals (e.g., PWM signal is high level, analog signal is low level) to the PWM / analog dimming mode switching circuit. The PWM / analog dimming mode switching circuit is a conventional existing circuit, such as... Figure 2 and 3 As shown, it consists of MOSFETs Q606A, Q610A, and Q612A, and resistor R606A. The PWM dimming signal is input to the sources of MOSFETs Q610A and Q612A, which switch the direction of the PWM dimming signal. The PWM or analog switching signal is input to the gate of MOSFET Q612A or, through the inverted input of MOSFET Q606A, to the gate of MOSFET Q610A, thus achieving switching. The PWM / analog dimming mode switching circuit is electrically connected to the parallel PWM dimming circuit and the analog dimming circuit. Both the PWM dimming circuit and the analog dimming circuit include voltage fine-tuning circuits electrically connected to the PWM / analog dimming mode switching circuit. The voltage fine-tuning circuit of the PWM dimming circuit is a conventional existing circuit, such as... Figure 2 and 3As shown, the voltage fine-tuning circuit consists of MOSFETs Q607A and Q605A, resistors R614A, R604A, R602A, and R601A. The PWM dimming signal is input to the gate of MOSFET Q607A. MOSFETs Q607A, R604A, Q605A, and R602A form a two-way circuit. The PWM dimming signal is output from the drain of MOSFET Q605A. Resistors R602A and R601A form a voltage divider circuit. Adjusting the resistance value of resistor R601A adjusts the output voltage. The voltage fine-tuning circuit of the analog dimming circuit consists of MOSFETs Q608A and Q604A, resistors R605A and R603A, and R611A. The PWM dimming signal is input to the gate of MOSFET Q608A. MOSFETs Q608A, R604A, R605A, R603A, and R611A form a two-way circuit. The PWM dimming signal is input to the gate of MOSFET Q608A. MOSFETs Q607A, R604A, R602A, and R601A form a two-way circuit. The PWM dimming signal is output from the drain of MOSFET Q605A. Resistors R602A and R601A form a two-way circuit. A 605A transistor, a MOSFET Q604A, and a resistor R603A form a two-directional circuit. The PWM dimming signal is output from the drain of the MOSFET Q604A. Resistors R603A and R611A form a voltage divider circuit; adjusting the resistance value of resistor R611A adjusts the output voltage. The PWM dimming circuit and the analog dimming circuit together include a 10V / 5V level switching circuit. The microcontroller is electrically connected to the 10V / 5V level switching circuit and can send a 10V or 5V switching signal to it (e.g., 10V for low level, 5V for high level). The 10V / 5V level switching circuit is electrically connected to two voltage fine-tuning circuits, providing 10V or 5V voltage to the voltage fine-tuning circuit of the PWM dimming circuit and the voltage fine-tuning circuit of the analog dimming circuit. The 10V / 5V level switching circuit is a conventional existing circuit, such as... Figure 2 and 3 As shown, the 10V / 5V level switching circuit consists of MOSFETs Q602A, Q601A, and Q600A, resistor R600A, diode D600A, and diode D601A. The 10V or 5V switching signal is input to the gates of MOSFETs Q602A and Q600A. MOSFETs Q601A and Q600A provide voltage selection switching. The 10V or 5V switching signal is inverted by MOSFET Q602A and input to the gate of MOSFET Q601A. The source of MOSFET Q601A is connected to a 6V power supply, and the source of MOSFET Q600A is connected to an 11V power supply, thus achieving high / low level switching between 5V and 10V levels. The fine-tuning circuit of the PWM dimming circuit is sequentially connected to a voltage follower and isolation diode D602A. The voltage follower of the PWM dimming circuit is a conventional existing circuit, such as... Figure 2 and 3As shown, it uses an integrated operational amplifier U600A configured as a voltage follower, giving the PWM dimming signal stronger driving capability and a larger input impedance to reduce the impact on the signal. The voltage fine-tuning circuit of the analog dimming circuit is sequentially connected to a low-pass filter, a voltage follower, and an isolation diode D603A. The low-pass filter is a second-order low-pass filter, which is a conventional technology, such as... Figure 2 and 4 As shown, it consists of resistor R607A, capacitor C606A, resistor R608A, and capacitor C607A. Resistor R607A and capacitor C606A form the first-stage filter, and resistor R608A and capacitor C607A form the second-stage filter. Through these two stages of filtering, the 600Hz PWM dimming signal can be converted into an analog dimming signal output. The voltage follower of the analog dimming circuit is a conventional circuit, such as... Figure 2 and 4 As shown, it is configured as a voltage follower by the integrated operational amplifier U601A, giving the analog dimming signal stronger driving capability and a larger input impedance to reduce the impact on the signal. The output terminals of the isolation diodes of the PWM dimming circuit and the analog dimming circuit are combined and electrically connected to a 1.3x non-inverting amplifier circuit. The 1.3x non-inverting amplifier circuit is a conventional existing circuit, such as... Figure 2 and 5 As shown, it uses an integrated operational amplifier U602A configured as a 1.3x non-inverting amplifier circuit to compensate for the attenuation of the dimming signal by the preceding stage circuit and to provide sufficient drive capability to drive the subsequent output circuit. The 1.3x non-inverting amplifier circuit is electrically connected to the output circuit, which is a conventional circuit, such as... Figure 2 and 5 As shown, the circuit consists of transistors Q603A and Q609A, capacitors 604A and 601A. Transistors Q603A and Q609A form the output circuit, providing a sufficiently large current to drive the lamp's dimming function. The output circuit is electrically connected to an ESD protection and clamping circuit, a conventional circuit consisting of a TVS diode D605A, diodes D604A and D606A. The TVS diode D605A protects the circuit from damage caused by electrostatic discharge, while diodes D604A and D606A act as an output voltage clamping circuit to prevent excessively high external voltage signals from damaging the dimming circuit. The ESD protection and clamping circuit is also electrically connected to an abnormal circuit breaker, a conventional technology. Figure 2 and 5 As shown, it is a relay HF46F. The abnormal circuit breaking circuit is also electrically connected to the output interface, through which multiple lamps' dimming switches are connected. The output terminal of the output circuit is connected to a voltage sampling circuit, which is a conventional existing circuit, such as... Figure 2 and 5As shown, it consists of resistors R622A, R625A, R623A, and capacitor C610A. The dimming signal is input to resistor R622A. Resistors R622A and R625A form a voltage divider sampling circuit, and resistor R623A and capacitor C610A form a low-pass filter circuit. The dimming signal is sampled to the microcontroller's ADC pin, and the microcontroller is electrically connected to an abnormal open circuit.

[0022] The multi-mode intelligent lighting dimming circuit proposed in this invention has four dimming modes: analog 0-5V, analog 0-10V, PWM 5V, and PWM 10V. It can easily select the level mode according to the DIM dimming requirements of different lamps by sending PWM or analog switching signals to the PWM / analog dimming mode switching circuit and sending 10V or 5V switching signals to the 10V / 5V level switching circuit. Moreover, different modes share a single output circuit and output interface, which greatly improves the versatility and flexibility of the circuit and makes it more adaptable.

[0023] The multi-mode intelligent lighting dimming circuit uses the PWM signal output by the microcontroller as the PWM dimming signal input. With the help of a low-pass filter, it can convert the PWM 0-100% into an analog 0-5V or analog 0-10V signal, realizing the simultaneous output of analog and PWM level signals from a single signal input, meeting the dimming signal requirements of different scenarios.

[0024] Equipped with a comprehensive output anomaly handling circuit, the voltage signal is acquired by the voltage acquisition circuit at the output terminal of the output circuit, and the microcontroller determines whether the voltage is within a reasonable range. When the voltage is abnormal, the microcontroller can control the abnormal circuit to disconnect, thus disconnecting the multi-mode intelligent lighting dimming circuit from the lamps. The lamps then operate at maximum brightness, effectively preventing abnormal brightness adjustment of the lamps due to malfunctions in the multi-mode intelligent lighting dimming circuit, and ensuring driving safety in tunnels.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multi-mode intelligent lighting dimming circuit, comprising a microcontroller, characterized in that: It also includes an input isolation circuit electrically connected to the microcontroller and using the PWM signal output by the microcontroller as the PWM dimming signal input. The input isolation circuit is also electrically connected to a PWM / analog dimming mode switching circuit. The microcontroller is electrically connected to the PWM / analog dimming mode switching circuit and can send PWM or analog switching signals to it. The PWM / analog dimming mode switching circuit is electrically connected to a parallel PWM dimming circuit and an analog dimming circuit. Both the PWM dimming circuit and the analog dimming circuit include voltage fine-tuning circuits electrically connected to the PWM / analog dimming mode switching circuit. The PWM dimming circuit and the analog dimming circuit together include a 10V / 5V level switching circuit, and the microcontroller is electrically connected to the 10V / 5V level switching circuit. The circuit can switch between voltage levels and send a 10V or 5V switching signal to the 10V / 5V level switching circuit. The 10V / 5V level switching circuit is electrically connected to two voltage fine-tuning circuits to provide 10V or 5V voltage to the voltage fine-tuning circuit of the PWM dimming circuit and the voltage fine-tuning circuit of the analog dimming circuit. The fine-tuning circuit of the PWM dimming circuit is electrically connected to a voltage follower and an isolation diode in sequence. The voltage fine-tuning circuit of the analog dimming circuit is electrically connected to a low-pass filter, a voltage follower, and an isolation diode in sequence. The output terminals of the isolation diodes of the PWM dimming circuit and the analog dimming circuit are combined and then electrically connected to a 1.3x in-phase amplifier circuit. The 1.3x in-phase amplifier circuit is electrically connected to the output circuit. The output circuit is connected to the dimming lines of multiple lamps through the output interface.

2. The multi-mode intelligent lighting dimming circuit according to claim 1, characterized in that: An abnormal circuit breaking circuit is electrically connected between the output circuit and the output interface. A voltage sampling circuit is connected to the output terminal of the output circuit. Both the voltage sampling circuit and the abnormal circuit breaking circuit are connected to a microcontroller.

3. The multi-mode intelligent lighting dimming circuit according to claim 2, characterized in that: The abnormal circuit break is a relay.

4. A multi-mode intelligent lighting dimming circuit according to claim 1, 2, or 3, characterized in that: The output circuit and the abnormal circuit breaking circuit are electrically connected by an ESD protection and clamping circuit.

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