Circuit for linearly driving LED illumination based on MCU-controlled color temperature switching
地域：
Jiangsu
摘要
The present invention provides a circuit for linearly driving LED illumination based on MCU-controlled color temperature switching, comprising an SCM color temperature control module, an LED linear dimming driving and control module and an LED illumination module. The SCM color temperature control module may output two PWM signals, to adjust the ratio of current at the LED bead strings, thus to synthesize two or more different color temperatures. Or, the SCM color temperature control module outputs multi-channel control signals and then controls a color temperature output module to control the ratio of current at the LED bead strings at high and low color temperatures, thus to realize two or more color temperatures. Furthermore, a memory function or a non-memory function can be realized, if desired. The LED linear dimming driving and control module can control and adjust the illuminance of the LED illumination module, and can realize a dimming function.
說明書
This application claims the benefit of priority from Chinese Patent Application No. CN 201910654733.X, filed on Jul. 20, 2019. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference in its entirety.
The present invention relates to a circuit for linearly driving LED illumination based on MCU-controlled color temperature switching.
Linearly driving LED illumination, which is applied for circuit simplification and works in a power-frequency mode without high-frequency interference, is gradually popular among customers.
In recent years, LED lamps have been widely applied as illumination power supplies. With the increased demands for LED illumination power supplies and the development of the LED technology, LED illumination power supplies with adjustable illuminance and color temperature have become a new development trend. In the case of linearly driven LED illumination, the combination of MCU-controlled color temperature switching and silicon-controlled dimming has long been expected by users.
權(quán)利要求
What is claimed is:1. A circuit for linearly driving light-emitting diode (LED) illumination based on Micro-Controller Unit (MCU)-controlled color temperature switching, comprising:an AC power supply module, configured to supply an input voltage; an LED illumination module connected to the AC power supply module and an Single Chip Microcomputer (SCM) color temperature control module, comprising at least two LED bead strings at different color temperatures; the SCM color temperature control module, connected to the Alternating Current (AC) power supply module, an LED linear dimming driving and control module, and the LED illumination module, respectively, comprising an SCM input control module, an SCM processing module and a color temperature output control module, wherein the SCM input control module is configured to generate an enable signal to trigger the operation of the SCM processing module, the SCM processing module performs corresponding processing upon receiving the enable signal and controls the color temperature output control module, the color temperature output control module may output two Pulse-Width Modulation (PWM) control signals or multi-channel control signals, to control the ratio of current at the LED bead strings at high and low color temperatures, thus to realize the control of two or more color temperatures; and the LED linear dimming driving and control module, connected to the AC power supply module and the SCM color temperature control module, configured to control and adjust the illuminance of the LED illumination module and to realize a dimming function, wherein the LED illumination module comprises an LED bead string at a high color temperature and an LED bead string at a low color temperature, wherein the SCM color temperature control module outputs multi-channel control signals, and controls the ratio of current at the LED bead string at a high color temperature and current at the LED bead string at a low color temperature by the multi-channel control signals, thus to generate at least two different color temperatures. 2. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 1 , wherein the SCM input control module comprises at least one of a power switch control module, a dual in-line package (DIP) switch control module, a key control module, a wireless/WIFI control module, a human body sensing control module, an IR/RF remote control module, a touch control module and a sound control module. 3. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 1 , wherein the SCM color temperature control module outputs two PWM signals, to adjust the ratio of current at the LED bead string at a high color temperature and current at the LED bead string at a low color temperature, thus to generate at least two different color temperatures. 4. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 3 , wherein the LED linear dimming driving and control module is configured to regulate the power of the LED illumination module, and control trimming of the LED bead string at a high color temperature and the LED bead string at a low color temperature after the ratio of current at the LED bead string at a high color temperature and current at the LED bead string at a low color temperature is well configured. 5. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 3 , wherein a first switch control unit is provided between the LED bead string at a low color temperature and the SCM color temperature control module and a second switch control unit is provided between the LED bead string at a high color temperature and the SCM color temperature control module; the first switch control unit comprises a first Metal Oxide Semiconductor (MOS) transistor having a drain connected to the LED bead string at a low color temperature, a gate connected to the SCM color temperature control module, and a source connected to the virtual GND, and a first resistor having an end connected to the gate of the first MOS transistor and the other end connected to the source of the first MOS transistor; and the second switch control unit comprises a second MOS transistor having a drain connected to the LED bead string at a high color temperature, a gate connected to the SCM color temperature control module, and a source connected to the virtual GND, and a second resistor having an end connected to the gate of the second MOS transistor and the other end connected to the source of the second MOS transistor. 6. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 1 , wherein a power supply module is further provided between an AC rectifier module and the LED illumination module, the power supply module comprising a first dropping resistor connected to the LED illumination module and a first voltage regulator connected to a virtual ground (GND); a first node is provided between the first dropping resistor and a cathode input end of the first voltage regulator, an anode of the first voltage regulator is a second node, and an electrolytic capacitor is provided between the first node and the second node; an anode of the electrolytic capacitor is connected to the first node and a cathode of the electrolytic capacitor is connected to the second node; and the first node is an anode input end of a SCM power supply and the second node is a virtual power GND. 7. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 6 , wherein a first fast recovery diode is provided between a rectifier bridge and the LED bead strings at high and low color temperatures. 8. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 1 , wherein the SCM color temperature control module generates multi-channel color temperature control signals and then realizes adjustment of the ratio of current at the bead strings at high and low color temperatures by the color temperature output control module, thus to realize the control of two or more color temperatures. 9. The circuit for linearly driving LED illumination based on MCU-controlled color temperature switching according to claim 1 , wherein the AC power supply module supplies 120V AC power or 230V AC power.
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