Multi-channel dimmable power supply controlled by single-channel analog signal and dimming method of multi-channel dimmable power supply

Abstract

The invention discloses a multi-channel dimmable power supply controlled by a single-channel analog signal and a dimming method of the multi-channel dimmable power supply. The multi-channel dimmable power supply comprises a signal input module, a signal processing module, a constant-current dimming control module, a power distribution module and two or more output modules which are connected in sequence. During application, the signal input module acquires a 0-10V dimming signal and transmits the 0-10V dimming signal to the signal processing module; the signal processing module converts an analog dimming signal into a digital signal through an internal ADC conversion unit, analyzes the digital signal in real time, judges the magnitude of an input voltage, carries out segmentation processing on the input voltage, and controls the power distribution module to switch the power supply power to different output modules. According to the invention, multi-channel dimming and switching control can be realized only by one path of 0-10V analog signal, and multi-channel wiring is replaced by a single-path signal, so that the wiring and control complexity is reduced, and the system cost is reduced; meanwhile, dimming is accurate, switching is stable, and critical voltage oscillation is avoided; moreover, the application scene is flexible, and the use scene with two color temperatures can be realized through a single-path power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and particularly to a multi-channel adjustable light power supply controlled by a single-channel analog signal and its dimming method, which is applicable to the control of lighting devices that require switching between different dimming scenarios. Background Art

[0002] Most of the adjustable light power supplies on the current market are single-channel output dimming, which is difficult to meet the diverse requirements for lights with different color temperatures and brightness in complex lighting scenarios. Some dual-channel dimming power supplies use multiple control signals to adjust respectively, resulting in complex system wiring, increased costs, and potential signal interference problems. In addition, existing dual-channel switching power supplies are prone to repeated switching of the two-channel outputs due to insufficient signal acquisition and processing accuracy under the critical voltage state, affecting the use stability and the lifespan of the device. Therefore, developing an adjustable light power supply that can accurately control the dual-channel switching through a single-channel analog signal and has hysteresis protection has become an urgent problem in the industry. Summary of the Invention

[0003] The present invention provides a multi-channel adjustable light power supply controlled by a single-channel analog signal and its dimming method, which uses a 0-10V dimming signal to achieve intelligent switching and precise dimming of multi-channel outputs, and avoids mis-switching under critical voltage through hysteresis design, meets the requirements of different lighting scenarios, simplifies the system structure, and improves the use stability and reliability.

[0004] To achieve the above object, the present invention is implemented by the following technical solutions:

[0005] A multi-channel adjustable light power supply controlled by a single-channel analog signal includes a signal input module, a signal processing module, a constant current dimming control module, a power distribution module, and an output module connected in sequence; the signal input module receives a 0-10V dimming signal, performs 0-10V voltage detection, and then transmits it to the signal processing module; the signal processing module converts the input analog dimming signal into a digital signal, identifies and segments the voltage to form multi-channel dimming control; the constant current dimming control module is used to ensure the stability of the output current; the power distribution module accurately distributes the power of the power supply to the corresponding output module when receiving the switching instruction; the output module includes two or more dimming outputs, which are respectively connected to different lamp boards.

[0006] Preferably, the signal input module mainly includes an AD acquisition module.

[0007] Preferably, the signal processing module is based on a single-chip microcomputer, and an ADC conversion unit is integrated in the single-chip microcomputer.

[0008] Preferably, as the above solution, the constant current dimming control module mainly includes an AC-DC power conversion and subsequent processing circuit.

[0009] Preferably, as the above solution, the power distribution module mainly includes a multi-output switching circuit composed of a relay and a field effect transistor.

[0010] A dimming method for a multi-channel adjustable light source controlled by a single-channel analog signal includes the following steps:

[0011] S1. When the power is turned on, the signal input module collects a 0-10V dimming signal, performs a 0-10V voltage detection, and then transmits it to the signal processing module.

[0012] S2. The signal processing module converts the input analog dimming signal into a digital signal through an internal ADC conversion unit, and performs real-time analysis on the digital signal to judge the magnitude of the input voltage and perform segmented processing on it:

[0013] When the input voltage is within the dimming voltage range, the signal processing module generates a corresponding PWM dimming control signal to control the first output module to adjust the output power within the 0-100% dimming range and drive the connected first street lamp board.

[0014] When the input voltage rises to the first hysteresis voltage threshold, a switching instruction is triggered, and the single-chip microcomputer controls the power distribution module to switch the power supply power to the second output module to drive the connected second street lamp board.

[0015] When the input voltage drops to the second hysteresis voltage threshold, a switching instruction is triggered again, and the single-chip microcomputer controls the power distribution module to switch the power back to the first output module.

[0016] Preferably, in step S1, the signal input module sequentially performs a 0-10V voltage detection, a resistor voltage division, and an RC filtering and then gives it to the signal processing module for detection and identification.

[0017] Preferably, in step S2, the dimming voltage range is set to 0-9V, the first hysteresis voltage threshold is set to 9.7V, and the second hysteresis voltage threshold is set to 9.2V.

[0018] Due to the above structure, the beneficial effects of the present invention are as follows:

[0019] 1. Simplify the system design: Only one 0-10V analog signal is required to achieve multi-channel dimming and switching control. The single-channel signal replaces multi-channel wiring, reducing the wiring and control complexity and lowering the system cost.

[0020] 2. Precise Dimming and Stable Switching: Achieve 0-100% precise dimming through a single-chip microcomputer and PWM dimming technology; Combine the segmented voltage threshold control logic with power distribution to effectively avoid mis-switching under critical voltages, that is, avoid critical voltage oscillation, and improve the power supply working stability and equipment service life.

[0021] 3. Flexible Application Scenarios: Adopt the collaborative design of a single-chip microcomputer and relay power distribution. A single power supply supports seamless switching between two color temperatures, which can meet the needs of different lighting scenarios. For example, by switching the warm and cold color temperature lamp boards, rapid switching of diverse scenarios such as daily home lighting and atmosphere creation can be achieved. A single power supply realizes the usage scenarios of two color temperatures. Moreover, it is compatible with the standard 0-10V dimming interface, facilitating integration into existing intelligent lighting systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 It is the power supply architecture diagram of the present invention;

[0024] Figure 2 It is the connection circuit diagram of the signal input module and the signal processing module of the present invention;

[0025] Figure 3 It is the constant current dimming control module circuit diagram of the present invention;

[0026] Figure 4 It is the power distribution module circuit diagram of the present invention;

[0027] Figure 5 It is the working flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] Such as Figure 1As shown in the figure, this embodiment provides a multi-channel adjustable optical power supply controlled by a single-channel analog signal, which includes a signal input module, a signal processing module, a constant current dimming control module, a power distribution module, and an output module connected in sequence. The signal input module receives a 0-10V dimming signal, performs 0-10V voltage detection, and then transmits it to the signal processing module. The signal processing module converts the input analog dimming signal into a digital signal, identifies and segments the voltage to form multi-channel dimming control. The constant current dimming control module is used to ensure stable output current. The power distribution module accurately distributes the power supply power to the corresponding output module when receiving a switching instruction. The output module includes two or more dimming outputs, which are respectively connected to different lamp boards (such as warm and cold dual-color temperature lamp boards).

[0030] In this embodiment, the signal input module mainly includes an AD acquisition module, which mainly realizes 0-10V voltage detection. Through resistor voltage division and then RC filtering, it is given to the ADC of the MCU for detection and identification (as Figure 2 shown).

[0031] In this embodiment, the signal processing module is built based on a microcontroller (such as a high-performance single-chip microcomputer), and an ADC conversion unit is integrated inside. Specifically, as Figure 2 shown, a single-chip microcomputer with an ARM or C51 core is selected. The input signal is sampled through the internal ADC conversion unit, and the sampling frequency is set to 100Hz to ensure the real-time and accuracy of signal processing. The ADC of the single-chip microcomputer will identify the voltage, and the voltage is segmented in the program. For example, 0-9V is the first segment, representing the dimming segment of the first channel, and 9-10V is the second segment, representing the dimming segment of the second channel. If the ADC detects 2V, it is in the first channel, the dimming value corresponds to 66%, the second channel is in the off state. At this time, JDQ1 is a high-level signal, JDQ2\JDQ3 are low-level signals, DRV outputs PWM to control the on-time of Q1, so as to control the output current of VO1 to 66%, and the CS pin is the current detection pin.

[0032] Or 0-3V is the first segment; 4-7V is the second segment; 8-10V is the third segment, retaining its flexibility.

[0033] 0-10V control voltage and multi-channel dimming output, supporting two or more segments of dimming output, which can be set. As shown in the following table.

[0034] Voltage 0 1 2 3 4 5 6 7 8 9 10 LED1 0 33％ 66％ 99％ LED2 0 33％ 66％ 99％ LED3 0 50％ 100％

[0035] In this embodiment, as Figure 3As shown, the constant-current dimming control module mainly includes an AC-DC power conversion and subsequent processing circuit, which is used to ensure stable output current, provide reliable power output for the lamp board, and achieve a stable dimming effect.

[0036] In this embodiment, as Figure 4 shown, the power distribution module uses a relay as the core component, and cooperates with a field-effect transistor to achieve the switching of power between two outputs. The relay has high reliability and low on-resistance characteristics to ensure stable power transmission. When receiving the switching instruction from the signal processing module, it controls the relay contact to act, and accurately distributes the power supply power to the corresponding output module.

[0037] As Figure 5 shown, this embodiment also provides a dimming method for a multi-channel adjustable light power supply controlled by a single-channel analog signal, including the following steps:

[0038] S1. When the power supply is powered on, the signal input module collects a 0-10V dimming signal, and after performing 0-10V voltage detection, resistor voltage division, and RC filtering in sequence, it gives it to the signal processing module for detection and identification;

[0039] S2. The signal processing module converts the input analog dimming signal into a digital signal through an internal ADC conversion unit, and performs real-time analysis on the digital signal to judge the magnitude of the input voltage and perform segmented processing on it:

[0040] When the input voltage is within the dimming voltage (0-9V) range, the signal processing module generates a corresponding PWM dimming control signal, controls the first output module to adjust the output power within the 0-100% dimming range, and drives the connected first lamp board (such as a warm-color temperature lamp board). The first warm-color temperature lamp board realizes soft dimming to meet the daily lighting needs;

[0041] When the input voltage rises to the first hysteresis voltage threshold (input voltage is greater than 9.7V), a switching instruction is triggered, and the single-chip microcomputer controls the power distribution module to switch the power supply power to the second output module, driving the connected second lamp board (such as a cold-color temperature lamp board). The second cold-color temperature lamp board is turned on to provide bright and clear lighting for scenarios such as reading and working;

[0042] When the input voltage drops to the second hysteresis voltage threshold (input voltage is less than 9.2V), a switching instruction is triggered again, and the single-chip microcomputer controls the power distribution module to switch the power back to the first output module, and the warm-color temperature lamp board works again to achieve seamless switching between different scenarios.

[0043] When the voltage changes between 9.2V and 9.7V, the current state remains unchanged. By setting the hysteresis voltage thresholds of 9.7V and 9.2V, a voltage hysteresis interval is formed to effectively avoid the repeated switching of the two outputs near the critical voltage of 9.5V.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-channel adjustable optical power supply controlled by a single-channel analog signal, characterized in that: It includes a signal input module, a signal processing module, a constant current dimming control module, a power distribution module, and an output module connected in sequence; The signal input module receives a 0-10V dimming signal, performs 0-10V voltage detection, and then transmits it to the signal processing module; The signal processing module converts the input analog dimming signal into a digital signal, identifies and segments the voltage, and forms multi-channel dimming control; The constant current dimming control module is used to ensure stable output current; When receiving the switching instruction, the power distribution module accurately distributes the power supply power to the corresponding output module; The output module includes two or more dimming outputs, which are respectively connected to different lamp boards.

2. The multi-channel adjustable optical power supply controlled by a single-channel analog signal according to claim 1, wherein: The signal input module mainly includes an AD acquisition module.

3. The multi-channel adjustable optical power supply controlled by a single-channel analog signal according to claim 1, wherein: The signal processing module is based on a single-chip microcomputer, and an ADC conversion unit is integrated in the single-chip microcomputer.

4. A multi-channel adjustable optical power supply controlled by a single-channel analog signal according to claim 1, characterized in that: The constant current dimming control module mainly includes an AC-DC power conversion and subsequent processing circuit.

5. A multi-channel adjustable optical power supply controlled by a single-channel analog signal, characterized in that: The power distribution module mainly includes a multi-channel output switching circuit composed of a relay and a field effect transistor.

6. A dimming method for a multi-channel adjustable optical power supply controlled by a single-channel analog signal according to any one of claims 1 to 5, characterized in that: It includes the following steps: S1. When the power supply is powered on, the signal input module collects the 0-10V dimming signal, performs 0-10V voltage detection, and then transmits it to the signal processing module; S2. The signal processing module converts the input analog dimming signal into a digital signal through the internal ADC conversion unit, and performs real-time analysis on the digital signal to judge the magnitude of the input voltage and segment it: When the input voltage is within the dimming voltage range, the signal processing module generates a corresponding PWM dimming control signal to control the first output module to adjust the output power within the 0-100% dimming range and drive the connected first lamp board; When the input voltage rises to the first hysteresis voltage threshold, a switching instruction is triggered, and the single-chip microcomputer controls the power distribution module to switch the power supply power to the second output module to drive the connected second lamp board; When the input voltage drops to the second hysteresis voltage threshold, a switching instruction is triggered again, and the single-chip microcomputer controls the power distribution module to switch the power back to the first output module.

7. The dimming method of a multi-channel adjustable optical power supply controlled by a single-channel analog signal according to claim 6, characterized in that: In step S1, the signal input module sequentially performs 0-10V voltage detection, resistor voltage division, and RC filtering and then gives it to the signal processing module for detection and identification.

8. The dimming method of a multi-channel adjustable optical power supply controlled by a single-channel analog signal according to claim 6, characterized in that: In step S2, the dimming voltage range is set to 0-9V, the first hysteresis voltage threshold is set to 9.7V, and the second hysteresis voltage threshold is set to 9.2V.

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