An intelligent dimming type LED driver power supply

Abstract

The present invention discloses an intelligent dimming type LED driving power supply, which includes a motherboard circuit and an embedded system circuit. The motherboard circuit includes a pin header TER2, a rectifier BD1, a transformer T1, a constant voltage driving chip IC1, a pin header TER3, a driving controller IC2 and a pin header TER1. The embedded system circuit includes a main control chip U1, an optocoupler U3 and a chip U2. The input end of the rectifier BD1 is connected to the input end of the pin header TER2. This intelligent dimming type LED driving power supply has the following advantages: First, the color temperature is constant during the dimming process, and no color change will be caused. Second, according to the characteristics of the human eye, a non-linear curve suitable for the human eye characteristics is provided by the single-chip microcomputer embedded system for dimming, with natural transition. Third, a linear optocoupler is used for isolation, reducing the control signal load of each power supply to 5 milliamperes, realizing one-to-many centralized control and safety isolation.

Description

Technical Field

[0001] The present invention relates to the technical field of LED driving power supplies, and particularly to an intelligent dimming type LED driving power supply. Background Art

[0002] Currently, a DC 0 - 10V voltage is used as the control signal for the LED driving power supply, and the output current is linearly adjusted proportionally according to the 0 - 10 control voltage. Due to technical limitations, the following disadvantages will occur: 1. During the dimming process, serious color temperature shift will occur, and from dark to bright, the human eye will feel it as a transition from "yellow light" to "white light". 2. The human eye's perception of the brightness change of light is a non-linear characteristic, so a linearly changing current does not suit the actual perception of the human eye, greatly reducing the comfort level. 3. Due to the relatively large load current, it is difficult to achieve centralized control of multiple power supplies by a single controller with existing technologies.

[0003] Based on the above defects, an intelligent dimming type LED driving power supply is proposed. Summary of the Invention

[0004] The purpose of the present invention is to provide an intelligent dimming type LED driving power supply, with a constant color temperature during the dimming process, no color change, capable of providing a non-linear curve dimming suitable for the characteristics of the human eye, with natural transition, achieving one-to-many centralized control and safety isolation, and solving the problems in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An intelligent dimming type LED driving power supply, including a motherboard circuit and an embedded system circuit. The motherboard circuit includes a pin header TER2, a rectifier BD1, a transformer T1, a constant voltage driver IC1, a pin header TER3, a drive controller IC2, and a pin header TER1. The embedded system circuit includes a main control chip U1, an optocoupler U3, and a chip U2. The input end of the rectifier BD1 is connected to the input end of the pin header TER2, the output end of the rectifier BD1 is connected to the input end of the transformer T1, the 2nd terminal of the transformer T1 is connected to the input end of the constant voltage driver IC1, and the output end of the constant voltage driver IC1 is connected to the 4th terminal of the transformer T1; the input end of the pin header TER3 is connected to the output end of the pin header TER2, the output end of the pin header TER3 is connected to the input end of the drive controller IC2, the input end of the drive controller IC2 is connected to the output end of the transformer T1, and the output end of the drive controller IC2 is connected to the input end of the pin header TER1; the output end of the pin header TER1 is connected to the power input end of the main control chip U1, the output end of the main control chip U1 is connected to the input end of the optocoupler U3 and connected to the input end of the chip U2, and the output ends of the optocoupler U3 and the chip U2 are both connected to the input end of the pin header TER4.

[0006] Preferably, the rectifier BD1 is of the model MB10S.

[0007] Preferably, the constant voltage driver IC1 is of the model MP24894.

[0008] Preferably, the drive controller is of the model MP24894.

[0009] Preferably, the main control chip U1 is of the model STM8S103XPXX.

[0010] Preferably, the optocoupler U3 is of the model 817A.

[0011] Preferably, the chip U2 is of the model 78L05SOT89.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] This intelligent dimming type LED driver power supply has the following advantages: First, the color temperature is constant during the dimming process, and color change will not occur; Second, a non-linear curve suitable for the characteristics of the human eye can be provided for dimming according to the characteristics of the human eye, with natural transition; Third, a linear optocoupler is used for isolation, reducing the control signal load of each power supply to 5 mA, realizing one-to-many centralized control and safety isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the schematic diagram of the motherboard circuit of the present invention;

[0015] Figure 2 is the circuit diagram of the embedded system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figure 1-2, An intelligent dimming type LED driver power supply, comprising a motherboard circuit and an embedded system circuit. The motherboard circuit includes a pin header TER2, a rectifier BD1, a transformer T1, a constant voltage driver IC1, a pin header TER3, a drive controller IC2, and a pin header TER1. Among them, the model of the rectifier BD1 is MB10S, the model of the constant voltage driver IC1 is MP24894, and the model of the drive controller is MP24894. The embedded system circuit includes a main control chip U1, an optocoupler U3, and a chip U2. The model of the main control chip U1 is STM8S103XPXX, the model of the optocoupler U3 is 817A, and the model of the chip U2 is 78L05SOT89. The input end of the rectifier BD1 of the optocoupler U3 is connected to the input end of the pin header TER2, the output end of the rectifier BD1 is connected to the input end of the transformer T1, the 2nd terminal of the transformer T1 is connected to the input end of the constant voltage driver IC1, and the output end of the constant voltage driver IC1 is connected to the 4th terminal of the transformer T1; the input end of the pin header TER3 of the optocoupler U3 is connected to the output end of the pin header TER2, the output end of the pin header TER3 is connected to the input end of the drive controller IC2, the input end of the drive controller IC2 is connected to the output end of the transformer T1, and the output end of the drive controller IC2 is connected to the input end of the pin header TER1; the output end of the pin header TER1 of the optocoupler U3 is connected to the power input end of the main control chip U1, the output end of the main control chip U1 is connected to the input end of the optocoupler U3 and is also connected to the input end of the chip U2, and the output ends of both the optocoupler U3 and the chip U2 are connected to the input end of the pin header TER4.

[0018] For this intelligent dimming type LED driver power supply, the power motherboard adopts a two-stage power structure, that is, the first-stage power supply composed of the pin header TER2, the rectifier BD1, the transformer T1, and the constant voltage driver IC1, and the second-stage power supply composed of the pin header TER3, the drive controller IC2, and the pin header TER1. The first-stage power supply provides a constant voltage power supply with PFC, which supplies power to the main control chip U1 of the embedded system circuit and also supplies power to the second-stage power supply. The second-stage power supply precisely controls the average output current according to the control signal provided by the main control chip U1; the main control chip U1 is a 0 - 10V control circuit board, which optically isolates the 0 - 10V control signal through the optocoupler U3. The main control chip U1 quantifies and samples the control signal, calculates the percentage of non-linear dimming from it, and outputs a 10-bit pulse width modulation signal to the secondary power supply chip, isolating and digitizing the 0 - 10V control signal. By using the embedded system circuit, a set of non-linear control signals suitable for the human eye can be provided.

[0019] In summary, the intelligent dimming type LED driver power supply has the following advantages: First, the color temperature is constant during the dimming process, and no color change will be caused. Second, a non-linear curve dimming suitable for the characteristics of the human eye can be provided according to the characteristics of the human eye, with a natural transition. Third, a linear optocoupler is used for isolation, reducing the control signal load of each power supply to 5 mA, realizing one-to-many centralized control and safety isolation.

[0020] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent dimming type LED driving power supply, comprising a motherboard circuit and an embedded system circuit, characterized in that: The motherboard circuit includes a pin header TER2, a rectifier BD1, a transformer T1, a constant voltage driver IC1, a pin header TER3, a drive controller IC2, and a pin header TER1. The embedded system circuit includes a main control chip U1, an optocoupler U3, and a chip U2. The input end of the rectifier BD1 is connected to the input end of the pin header TER2, and the output end of the rectifier BD1 is connected to the input end of the transformer T1. The No. 2 terminal of the transformer T1 is connected to the input end of the constant voltage driver IC1, and the output end of the constant voltage driver IC1 is connected to the No. 4 terminal of the transformer T1. The input end of the pin header TER3 is connected to the output end of the pin header TER2, and the output end of the pin header TER3 is connected to the input end of the drive controller IC2. The input end of the drive controller IC2 is connected to the output end of the transformer T1, and the output end of the drive controller IC2 is connected to the input end of the pin header TER1. The output end of the pin header TER1 is connected to the power input end of the main control chip U1. The output end of the main control chip U1 is connected to the input end of the optocoupler U3 and is also connected to the input end of the chip U2. The output ends of the optocoupler U3 and the chip U2 are both connected to the input end of the pin header TER4. The model of the rectifier BD1 is MB10S, and the model of the constant voltage driver IC1 is MP24894.

2. The intelligent dimming type LED driving power supply according to claim 1, characterized in that: The model of the drive controller is MP24894.

3. The intelligent dimming type LED driving power supply according to claim 1, wherein: The model of the main control chip U1 is STM8S103XPXX.

4. The intelligent dimming type LED driving power supply according to claim 1, wherein: The model of the optocoupler U3 is 817A.

5. The intelligent dimming type LED driving power supply according to claim 1, wherein: The model of the chip U2 is 78L05SOT89.

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