Multi-color-temperature conversion control circuit

Abstract

The utility model relates to a multi-color-temperature conversion control circuit, which comprises a voltage-stabilizing control power supply circuit for supplying power to a microcontroller unit U2, the U2 is connected with a multi-gear switch and switch tubes Q1... Qn, and a signal input end of the U2 is connected with a timer and a temperature sensor. Different voltage signals are sampled and sent to the U2 through a multi-gear switch, after the U2 receives the signals, the signals are output through an internal logic operation and algorithm control unit to respectively control a switch tube Q1... a switch tube Qn, so that the duty ratios of the corresponding switch tubes are complementary, and the output current proportion is changed by controlling the duty ratios, so that the change of different color temperatures is realized. The timer provides a time signal, the temperature sensor provides an acquisition signal of external air temperature, and the microcontroller unit U2 performs analysis and processing according to a feedback signal, reasonably plans a color temperature change period, performs classified control on a color temperature adjustment effect, and can reduce interference to human beings.

Description

Technical Field

[0001] The utility model relates to the field of LED lighting equipment, in particular to a multi-color temperature conversion control circuit. Background Art

[0002] The color temperature of LED light source is different, and the light color is also different: when the color temperature is below 3300K, the light color is reddish, giving people a warm feeling, a stable atmosphere, and a warm feeling; the color temperature is between 3000 and 6000K, and people have no particularly obvious visual psychological effects under this color tone, and have a refreshing feeling, so it is called "neutral" color temperature; when the color temperature exceeds 6000K, the light color is blue, giving people a cool feeling. By adjusting the color temperature of the light source, people's needs for lighting environment can be met. At present, in most cases, by changing the current size to drive LEDs of different color temperatures, when the current increases, its brightness and color temperature will increase.

[0003] China Patent Publication (Announcement) No.: CN110913525B, Patent Title: A Dual Bus Adjustable Color Temperature Lighting Circuit, which discloses the technical solution of "red LED strings and green LED strings are evenly arranged around white LEDs, and when the size and ratio of DC bus voltage A and DC bus voltage B are adjusted, the voltage of the voltage divider resistors R1, R3, R5, R6, R9, R11, R12 and R13 changes the potential of the linear dimming receiving pin LD of PWM chip U1 and PWM chip U3, thereby changing the current change of red LED and green LED, and changing the color temperature of the rectification LED according to the color mixing principle", and the color temperature is precisely adjusted by directly adjusting the voltage ratio of the dual bus to control the current ratio of red LED and green LED. The color temperature can be precisely adjusted, and the reliability is high. The color temperature and brightness can be adjusted from a long distance, and the lighting effect and visual comfort of LED street lamps can be improved.

[0004] As shown in the attached drawings, the voltage-dividing resistors R1, R3, R5 and R6 of the PWM chip U1 are connected to form a constant resistance value, and the voltage-dividing resistors R9, R11, R12 and R13 of the PWM chip U2 are also connected to form a constant resistance value. This circuit structure can change the LED lamp to a specific color temperature, but cannot change it to several different color temperatures, and lacks diversity. Summary of the invention

[0005] The purpose of the utility model is to provide a multi-color temperature conversion control circuit to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model is implemented through the following technical measures: a multi-color temperature conversion control circuit, which includes a voltage-stabilized control power supply circuit, which is composed of resistors R1, R2, R3, Q1 of a linear voltage regulator module, resistor R4, voltage-stabilized diode ZD1, capacitors C1, C2 and U1, and the voltage-stabilized control power supply circuit supplies power to a microcontroller unit U2; a multi-speed switch S1 is connected to a VDD port of the microcontroller unit U2, the microcontroller unit U2 is connected to a switch tube Q1, the gate of the switch tube Q1 is connected to the cathode of LED1, the source of the switch tube Q1 is grounded, the drain of the switch tube Q1 is connected to the output cathode terminal of the LED driving power supply, and the anode of LED1 is connected to the PIN1 terminal of the microcontroller unit U2; the PINn terminal of the microcontroller unit U2 is also connected to a switch tube Qn with the same circuit structure as the switch tube Q1; the input signal terminal of the microcontroller unit U2 is connected to a timer, and the input signal terminal of the microcontroller unit U2 is connected to a temperature sensor.

[0007] Compared with the prior art, the utility model has the following advantages: since S1 is a multi-position resistor switch, the resistance parameters of different resistors are connected in the switching circuit, and different working voltage signals are sampled and given to the microcontroller unit U2. After receiving the signal, the microcontroller unit U2 performs internal logic operations, and the algorithm control unit outputs signals to control the switch tubes Q1...switch tubes Qn respectively, so that the corresponding switch tube duty ratios are complementary, and the output current ratio is changed by controlling the duty ratio, thereby achieving the change of different color temperatures. The multi-position switch has at least three different positions of selectable resistors, which can be controlled into at least three LED lights with different color temperatures. If the multi-position switch has four, five, six or more positions, more color temperatures can be selected, so that users can achieve the best display effect according to the actual lighting environment. The timer can provide a time signal to the microcontroller unit U2, reasonably plan the color temperature change period, and control the color temperature intensity, which can protect human viewing needs while reducing energy consumption. The temperature sensor can provide the microcontroller unit U2 with the collected signal of the outside temperature. After the microcontroller unit U2 analyzes and processes the feedback signal, it outputs a command to classify and control the color temperature adjustment effect through the switch tube, which can reduce interference to humans and create an ecological and human-friendly viewing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0009] In the attached picture:

[0010] Figure 1This is a control circuit diagram for multi-color temperature conversion described in the utility model. DETAILED DESCRIPTION

[0011] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0012] Example 1

[0013] Please refer to Figure 1 The present embodiment provides a multi-color temperature conversion control circuit, which includes a voltage-stabilizing control power supply circuit, wherein the voltage-stabilizing control power supply circuit includes resistors R1, R2, and R3 connected in parallel, a transistor Q1, a voltage-dropping resistor R4, and a voltage-stabilizing diode ZD1 forming a linear voltage-stabilizing module, as well as capacitors C1, C2, and U1, etc. The voltage-stabilizing control power supply circuit supplies power to the microcontroller unit U2.

[0014] The VDD port of the microcontroller unit U2 is connected to a multi-speed switch S1, and the microcontroller unit U2 is connected to a switch tube Q1, the gate of the switch tube Q1 is connected to the cathode of LED1, the source of the switch tube Q1 is grounded, the drain of the switch tube Q1 is connected to the output cathode terminal of the LED driving power supply, and the anode of LED1 is connected to the PIN1 terminal of the microcontroller unit U2.

[0015] The PINn end of the microcontroller unit U2 is also connected to a switch tube Qn with the same circuit structure as the switch tube Q1. It should be noted that the switch tube Qn here corresponds to Rn of the multi-speed switch S1. If the resistance of the multi-speed switch has five levels, there are five switch tubes Q1, Q2, Q3, Q4, and Q5.

[0016] The input signal end of the microcontroller unit U2 is connected to a timer, which can provide a time signal to the microcontroller unit U2, reasonably plan the color temperature change period, and control the color temperature intensity, which can protect human viewing needs while reducing energy consumption. The working principle of the time control: the microcontroller unit U2 converts the external timer into a control signal to the switch tube, controls the current at the power output end, and thus achieves the effect of adjusting the color temperature.

[0017] The input signal end of the microcontroller unit U2 is connected to a temperature sensor. The temperature sensor can provide the microcontroller unit U2 with a signal of the external temperature. After analyzing and processing the feedback signal, the microcontroller unit U2 outputs a command to classify and control the color temperature adjustment effect through the switch tube, which can reduce interference to humans and create an ecological and human-friendly viewing effect.

[0018] The beneficial effects of the utility model are as follows: since S1 is a multi-position resistor switch, the resistance parameters of different resistors are connected in the switching circuit, and different working voltage signals are sampled and given to the microcontroller unit U2. After receiving the signal, the microcontroller unit U2 performs internal logic operations, and the algorithm control unit outputs signals to control the switch tubes Q1...switch tubes Qn respectively, so that the corresponding switch tubes complement each other in duty cycle. By controlling the duty cycle, the output current ratio is changed, thereby achieving the change of different color temperatures. The multi-position switch has at least three different positions of selectable resistors, which can be controlled into at least three LED lights with different color temperatures. If the multi-position switch has four, five, six or more positions, more color temperatures can be selected, so that users can achieve the best display effect according to the actual lighting environment. The timer can provide a time signal to the microcontroller unit U2, reasonably plan the color temperature change period, and control the color temperature intensity, which can protect human viewing needs while reducing energy consumption. The temperature sensor can provide the microcontroller unit U2 with the collected signal of the outside temperature. After the microcontroller unit U2 analyzes and processes the feedback signal, it outputs a command to classify and control the color temperature adjustment effect through the switch tube, which can reduce interference to humans and create a friendly effect.

[0019] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-color temperature conversion control circuit, characterized in that: The invention comprises a voltage-stabilizing control power supply circuit, which is composed of resistors R1, R2, R3, Q1 of a linear voltage-stabilizing module, resistor R4, voltage-stabilizing diode ZD1, capacitors C1, C2 and U1. The voltage-stabilizing control power supply circuit supplies power to a microcontroller unit U2; a multi-speed switch S1 is connected to a VDD port of the microcontroller unit U2, a switch tube Q1 is connected to the microcontroller unit U2, a gate of the switch tube Q1 is connected to the cathode of LED1, a source of the switch tube Q1 is grounded, a drain of the switch tube Q1 is connected to the output cathode terminal of an LED driving power supply, and the anode of LED1 is connected to a PIN1 terminal of the microcontroller unit U2; a switch tube Qn with the same circuit structure as that of the switch tube Q1 is also connected to a PINn terminal of the microcontroller unit U2; a timer is connected to an input signal terminal of the microcontroller unit U2, and a temperature sensor is connected to an input signal terminal of the microcontroller unit U2.

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