Multi-color-temperature multi-power switching circuit compatible with silicon controlled rectifier dimming

Abstract

The utility model relates to the technical field of silicon controlled rectifier dimming, in particular to a multi-color-temperature multi-power switching circuit compatible with silicon controlled rectifier dimming, which comprises a rectifying and filtering module, a silicon controlled rectifier dimming constant-current module, an MCU (Microprogrammed Control Unit) linear power supply module, a power failure detection module, a color temperature control module, a double-path PWM (Pulse-Width Modulation) dimming constant-current module and a load module, the input end of the power failure detection module is electrically connected with the rectification filtering module and used for detecting the power failure condition of the rectification filtering module, and the output end of the power failure detection module is electrically connected with the analog input end of the color temperature control module. The two pulse width modulation ends of the color temperature control module are electrically connected with the two pulse width modulation ends of the double-path PWM dimming constant-current module in a one-to-one correspondence manner, so that not only can a silicon controlled rectifier dimmer be compatible for brightness adjustment, but also the color temperature and the power can be flexibly and conveniently switched at any time; and meanwhile, the problem that the color temperature and the power are switched mistakenly due to the fact that a switch is turned on for several times due to mistakes in the actual use process is solved, and then the use experience of customers is improved.

Description

Technical Field

[0001] This utility model relates to the field of silicon controlled rectifier (SCR) dimming technology, and in particular to a multi-color temperature and multi-power switching circuit compatible with SCR dimming. Background Technology

[0002] Traditional dimming and color-tuning LED lights typically employ the following two schemes for multiple color temperatures:

[0003] Option 1: This option only supports adjusting the power (brightness) of the lamp using a SCR dimmer. To achieve color temperature changes, a multi-position DIP switch needs to be connected in series with the LED lamp. Different resistor values ​​are connected in series with different positions of the DIP switch to change the equivalent impedance of the corresponding color temperature series, thereby changing the current value flowing through the white light A path and the yellow light W path LED lamps, ultimately changing the color temperature. This option is implemented through hardware. For lamps that have already been installed, if you want to switch the color temperature, you need to remove them and manually toggle the switch before reinstalling them, which is very inconvenient.

[0004] Option 2: This is achieved by connecting a color temperature switching chip IC2 in series with the LED light. Taking the SM4226MB color temperature switching chip as an example, this option can only achieve three color temperature levels, such as 2700K-3800K-5000K. There are only three levels, which cannot flexibly achieve more color temperature levels. Moreover, the middle level of 3800K is limited by the fact that the first and last levels of 2700K and 5000K are fixed, and the color temperature value cannot be flexibly changed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a multi-color temperature and multi-power switching circuit compatible with SCR dimming. It can not only be compatible with SCR dimmers for power (brightness) adjustment, but also flexibly and conveniently switch color temperature and power at any time. At the same time, it avoids the problem of incorrect color temperature and power switching caused by accidental switching multiple times during actual use, thereby improving the customer's user experience.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A multi-color temperature and multi-power switching circuit compatible with SCR dimming includes a rectifier and filter module, a SCR dimming constant current module, an MCU linear power supply module, a power failure detection module, a color temperature control module, a dual-channel PWM dimming constant current module, and a load module.

[0008] The input terminal of the power failure detection module is electrically connected to the rectifier and filter module to detect the power failure status of the rectifier and filter module. The output terminal of the power failure detection module is electrically connected to the analog input terminal of the color temperature control module. The two pulse width modulation terminals of the color temperature control module are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module. The dual-channel PWM dimming constant current module is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, the power failure detection module, and the load module. The thyristor dimming constant current module is electrically connected to the rectifier and filter module, the power failure detection module, and the MCU linear power supply module. The MCU linear power supply module is electrically connected to the power failure detection module.

[0009] Furthermore, the power failure detection module includes resistors R10, R11, and R12. One end of resistor R10 is electrically connected to the rectifier filter module, and the other end of resistor R10 is electrically connected to one end of resistor R11. The other end of resistor R11 is electrically connected to one end of resistor R12 and one analog input terminal of the color temperature control module. The other end of resistor R12 is electrically connected to the MCU linear power supply module, the SCR dimming constant current module, and the dual-channel PWM dimming constant current module.

[0010] Furthermore, the color temperature control module includes a chip IC2. The power supply terminal of the chip IC2 is electrically connected to the MCU linear power supply module. The two pulse width modulation terminals of the chip IC2 are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module. The analog input terminal of the chip IC2 is electrically connected to the output terminal of the power failure detection module. The ground terminal of the chip IC2 is electrically connected to the ground terminal of the MCU linear power supply module.

[0011] Furthermore, the dual-channel PWM dimming constant current module includes a dual-channel PWM dimming constant current chip IC3. The two pulse width modulation terminals of the dual-channel PWM dimming constant current chip IC3 are electrically connected to the two pulse width modulation terminals of the color temperature control module, respectively. The ground terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, the power failure detection module, and the color temperature control module, respectively. The current input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the load module, and the voltage input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, and the load module, respectively.

[0012] Furthermore, the dual-channel PWM dimming constant current module also includes a resistor R13. One end of the resistor R13 is electrically connected to a current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R13 is electrically connected to the thyristor dimming constant current module, the ground terminal of the dual-channel PWM dimming constant current chip IC3, the color temperature control module, the power failure detection module, and the MCU linear power supply module, respectively.

[0013] Furthermore, the dual-channel PWM dimming constant current module also includes a resistor R14. One end of the resistor R14 is electrically connected to another current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R14 is electrically connected to the ground terminal of the thyristor dimming constant current module, the dual-channel PWM dimming constant current chip IC3, the color temperature control module, the power failure detection module, and the MCU linear power supply module, respectively.

[0014] Furthermore, the MCU linear power supply module includes resistors R8, R8A, R8B, and a Zener diode ZD1. One end of resistor R8 is electrically connected to the SCR dimming constant current module, the dual-channel PWM dimming constant current module, and the load module, respectively. The other end of resistor R8 is electrically connected to one end of resistor R8A. The other end of resistor R8A is electrically connected to one end of resistor R8B. The other end of resistor R8B is electrically connected to the cathode of Zener diode ZD1 and the color temperature control module, respectively. The anode of Zener diode ZD1 is electrically connected to the color temperature control module, the dual-channel PWM dimming constant current module, and the SCR dimming constant current module, respectively.

[0015] Furthermore, the thyristor dimming constant current module includes a constant current thyristor dimming chip IC1. The constant current input terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module, the dual-channel PWM dimming constant current module, the color temperature control module, and the power failure detection module, respectively. The thyristor dimming terminal of the constant current thyristor dimming chip IC1 is electrically connected to the color temperature control module, the power failure detection module, and the dual-channel PWM dimming constant current module, respectively.

[0016] Furthermore, the thyristor dimming constant current module also includes a resistor R4. The constant current output terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module, the dual-channel PWM dimming constant current module, the color temperature control module, and the power failure detection module through the resistor R4.

[0017] Furthermore, the thyristor dimming constant current module also includes resistors R1, R2, and R3. One end of resistor R1 is electrically connected to the thyristor dimming terminal of the constant current thyristor dimming chip IC1. The other end of resistor R1 is electrically connected to the rectifier bridge, one end of resistor R2, and the power-down detection module, respectively. The other end of resistor R2 is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to the voltage input terminal of the constant current thyristor dimming chip IC1.

[0018] The beneficial effects of this utility model are as follows:

[0019] This solution includes a rectifier and filter module, a thyristor dimming constant current module, an MCU linear power supply module, a power failure detection module, a color temperature control module, a dual-channel PWM dimming constant current module, and a load module. The input of the power failure detection module is electrically connected to the rectifier and filter module to detect power failures in the rectifier and filter module. By detecting whether the rectifier and filter module has lost power and the number of times it has lost power, the solution determines whether the user has turned off the wall switch and how many times it has been switched on and off. The power failure detection module transmits the detected power failure information to the color temperature control module for identification and processing. The color temperature control module outputs two different pulse width modulation signals to the dual-channel PWM dimming constant current module. This solution controls the current value of the load module to achieve arbitrary current ratios for different paths, thereby enabling different lighting color temperatures and power. Through the cooperation of the rectifier filter module, the SCR dimming constant current module, the MCU linear power supply module, the power failure detection module, the color temperature control module, the dual-channel PWM dimming constant current module, and the load module, this solution not only supports SCR dimmers for power (brightness) adjustment but also allows for flexible and convenient switching of color temperature and power at any time. Furthermore, it avoids the problem of incorrect color temperature and power switching caused by accidental multiple switching operations during actual use, thus improving the customer's user experience. Attached Figure Description

[0020] Figure 1 This is a block diagram of the module connection of the multi-color temperature and multi-power switching circuit compatible with silicon controlled rectifier dimming according to this utility model.

[0021] Figure 2 This is a circuit diagram of the multi-color temperature and multi-power switching circuit compatible with silicon controlled rectifier dimming according to this utility model.

[0022] Label Explanation:

[0023] 1. Rectifier and filter module; 2. Thyristor dimming constant current module; 3. MCU linear power supply module; 4. Power failure detection module; 5. Color temperature control module; 6. Dual-channel PWM dimming constant current module; 7. Load module. Detailed Implementation

[0024] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0025] Please refer to Figure 1 A multi-color temperature and multi-power switching circuit compatible with SCR dimming includes a rectifier and filter module, a SCR dimming constant current module, an MCU linear power supply module, a power failure detection module, a color temperature control module, a dual-channel PWM dimming constant current module, and a load module.

[0026] The input terminal of the power failure detection module is electrically connected to the rectifier and filter module to detect the power failure status of the rectifier and filter module. The output terminal of the power failure detection module is electrically connected to the analog input terminal of the color temperature control module. The two pulse width modulation terminals of the color temperature control module are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module. The dual-channel PWM dimming constant current module is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, the power failure detection module, and the load module. The thyristor dimming constant current module is electrically connected to the rectifier and filter module, the power failure detection module, and the MCU linear power supply module. The MCU linear power supply module is electrically connected to the power failure detection module.

[0027] As can be seen from the above description, the beneficial effects of this utility model are as follows:

[0028] This solution includes a rectifier and filter module, a thyristor dimming constant current module, an MCU linear power supply module, a power failure detection module, a color temperature control module, a dual-channel PWM dimming constant current module, and a load module. The input of the power failure detection module is electrically connected to the rectifier and filter module to detect power failures in the rectifier and filter module. By detecting whether the rectifier and filter module has lost power and the number of times it has lost power, the solution determines whether the user has turned off the wall switch and how many times it has been switched on and off. The power failure detection module transmits the detected power failure information to the color temperature control module for identification and processing. The color temperature control module outputs two different pulse width modulation signals to the dual-channel PWM dimming constant current module. This solution controls the current value of the load module to achieve arbitrary current ratios for different paths, thereby enabling different lighting color temperatures and power. Through the cooperation of the rectifier filter module, the SCR dimming constant current module, the MCU linear power supply module, the power failure detection module, the color temperature control module, the dual-channel PWM dimming constant current module, and the load module, this solution not only supports SCR dimmers for power (brightness) adjustment but also allows for flexible and convenient switching of color temperature and power at any time. Furthermore, it avoids the problem of incorrect color temperature and power switching caused by accidental multiple switching operations during actual use, thus improving the customer's user experience.

[0029] Furthermore, the power failure detection module includes resistors R10, R11, and R12. One end of resistor R10 is electrically connected to the SCR dimming constant current module, and the other end of resistor R10 is electrically connected to one end of resistor R11. The other end of resistor R11 is electrically connected to one end of resistor R12 and one analog input terminal of the color temperature control module. The other end of resistor R12 is electrically connected to the MCU linear power supply module, the SCR dimming constant current module, and the dual-channel PWM dimming constant current module.

[0030] Furthermore, the color temperature control module includes a chip IC2. The power supply terminal of the chip IC2 is electrically connected to the MCU linear power supply module. The two pulse width modulation terminals of the chip IC2 are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module. The analog input terminal of the chip IC2 is electrically connected to the output terminal of the power failure detection module. The ground terminal of the chip IC2 is electrically connected to the MCU linear power supply module.

[0031] Furthermore, the dual-channel PWM dimming constant current module includes a dual-channel PWM dimming constant current chip IC3. The two pulse width modulation terminals of the dual-channel PWM dimming constant current chip IC3 are electrically connected to the two pulse width modulation terminals of the color temperature control module, respectively. The ground terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, the power failure detection module, and the color temperature control module, respectively. The current input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the load module, and the voltage input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, and the load module, respectively.

[0032] As can be seen from the above description, in the constant current output circuit of the thyristor dimming constant current module, a dual-channel PWM dimming constant current chip IC3 is connected in series. The two currents of the dual-channel PWM dimming constant current chip IC3 are independently controlled by the PWM1 and PWM2 level signals of the color temperature control module. This allows for flexible changes in the duty cycle, thereby changing the current values ​​of the two channels and thus changing the color temperature and power.

[0033] Furthermore, the dual-channel PWM dimming constant current module also includes a resistor R13. One end of the resistor R13 is electrically connected to a current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R13 is electrically connected to the thyristor dimming constant current module, the ground terminal of the dual-channel PWM dimming constant current chip IC3, the color temperature control module, the power failure detection module, and the MCU linear power supply module, respectively.

[0034] As can be seen from the above description, resistor R13 is a sampling resistor used to limit the maximum current of the yellow LED in the load module.

[0035] Furthermore, the dual-channel PWM dimming constant current module also includes a resistor R14. One end of the resistor R14 is electrically connected to another current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R14 is electrically connected to the ground terminal of the thyristor dimming constant current module, the dual-channel PWM dimming constant current chip IC3, the color temperature control module, the power failure detection module, and the MCU linear power supply module, respectively.

[0036] As can be seen from the above description, resistor R14 is a sampling resistor used to limit the maximum current of the white LED in the load module.

[0037] Furthermore, the MCU linear power supply module includes resistors R8, R8A, R8B, and a Zener diode ZD1. One end of resistor R8 is electrically connected to the SCR dimming constant current module, the dual-channel PWM dimming constant current module, and the load module, respectively. The other end of resistor R8 is electrically connected to one end of resistor R8A. The other end of resistor R8A is electrically connected to one end of resistor R8B. The other end of resistor R8B is electrically connected to the cathode of Zener diode ZD1 and the color temperature control module, respectively. The anode of Zener diode ZD1 is electrically connected to the color temperature control module, the dual-channel PWM dimming constant current module, and the SCR dimming constant current module, respectively.

[0038] Furthermore, the thyristor dimming constant current module includes a constant current thyristor dimming chip IC1. The constant current input terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module, the dual-channel PWM dimming constant current module, the color temperature control module, and the power failure detection module, respectively. The thyristor dimming terminal of the constant current thyristor dimming chip IC1 is electrically connected to the color temperature control module, the power failure detection module, and the dual-channel PWM dimming constant current module, respectively.

[0039] Furthermore, the thyristor dimming constant current module also includes a resistor R4. The constant current output terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module, the dual-channel PWM dimming constant current module, the color temperature control module, and the power failure detection module through the resistor R4.

[0040] As can be seen from the above description, resistor R4 is used to adjust the linear regulation rate of the constant current thyristor dimming chip IC1. When the AC input voltage increases, the output current decreases, thereby reducing drive losses.

[0041] Furthermore, the thyristor dimming constant current module also includes resistors R1, R2, and R3. One end of resistor R1 is electrically connected to the thyristor dimming terminal of the constant current thyristor dimming chip IC1. The other end of resistor R1 is electrically connected to the rectifier bridge, one end of resistor R2, and the power-down detection module, respectively. The other end of resistor R2 is electrically connected to one end of resistor R3, and the other end of resistor R3 is electrically connected to the voltage input terminal of the constant current thyristor dimming chip IC1.

[0042] As can be seen from the above description, resistor R1 is used to provide the detection bus voltage of constant current SCR dimming chip IC1 to determine whether the bus is connected to the dimmer; resistors R2 and R3 are used to provide a current path for the BLEED circuit inside constant current SCR dimming chip IC1 to improve the low-end dimming performance of the dimmer.

[0043] Please refer to Figure 1 and Figure 2 As shown, Embodiment 1 of this utility model is as follows:

[0044] Please refer to Figure 1 A multi-color temperature and multi-power switching circuit compatible with SCR dimming includes a rectifier and filter module 1, a SCR dimming constant current module 2, an MCU linear power supply module 3, a power failure detection module 4, a color temperature control module 5, a dual-channel PWM dimming constant current module 6, and a load module 7.

[0045] The input terminal of the power failure detection module 4 is electrically connected to the rectifier and filter module 1 to detect the power failure status of the rectifier and filter module 1. The output terminal of the power failure detection module 4 is electrically connected to the analog input terminal of the color temperature control module 5. The two pulse width modulation terminals of the color temperature control module 5 are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module 6. The dual-channel PWM dimming constant current module 6 is electrically connected to the thyristor dimming constant current module 2, the MCU linear power supply module 3, the power failure detection module 4, and the load module 7. The thyristor dimming constant current module 2 is electrically connected to the rectifier and filter module 1, the power failure detection module 4, and the MCU linear power supply module 3. The MCU linear power supply module 3 is electrically connected to the power failure detection module 4.

[0046] Please refer to Figure 2 The power failure detection module 4 includes resistors R10 (resistance value can be 360kΩ), R11 (resistance value can be 360kΩ), and R12 (resistance value can be 30kΩ). One end of resistor R10 is electrically connected to the rectifier filter module 1, and the other end of resistor R10 is electrically connected to one end of resistor R11. The other end of resistor R11 is electrically connected to one end of resistor R12 and one analog input terminal of color temperature control module 5, respectively. The other end of resistor R12 is electrically connected to MCU linear power supply module 3, thyristor dimming constant current module 2, and dual-channel PWM dimming constant current module 6, respectively.

[0047] Please refer to Figure 2The color temperature control module 5 includes a chip IC2 (which can be a Silicon Microelectronics MC9810). The power supply terminal of the chip IC2 is electrically connected to the MCU linear power supply module 3. The two pulse width modulation terminals of the chip IC2 are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module 6. The analog input terminal of the chip IC2 is electrically connected to the output terminal of the power failure detection module 4. The ground terminal of the chip IC2 is electrically connected to the ground terminal of the MCU linear power supply module 3.

[0048] Please refer to Figure 2 The dual-channel PWM dimming constant current module 6 includes a dual-channel PWM dimming constant current chip IC3 (which can be a chip from Chipone Technology Co., Ltd. with model number BP5778). The two pulse width modulation terminals of the dual-channel PWM dimming constant current chip IC3 are electrically connected to the two pulse width modulation terminals of the color temperature control module 5 respectively. The ground terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the SCR dimming constant current module 2, the MCU linear power supply module 3, the power failure detection module 4, and the color temperature control module 5 respectively. The output terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the load module 7. The voltage input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the SCR dimming constant current module 2, the MCU linear power supply module 3, and the load module 7 respectively. The dual-channel PWM dimming constant current chip IC3 contains two MOSFETs. Pins D1 and D2 are the drains of the two MOSFETs, providing current input channels for the yellow LED and white LED, respectively. The dual-channel PWM dimming constant current chip IC2 outputs PWM1 and PWM2 signals with different duty cycles to independently control the on / off state of pins D1 and D2, thereby independently controlling the current values ​​of the yellow LED and white LED, thus achieving color temperature and power control.

[0049] Please refer to Figure 2 The dual-channel PWM dimming constant current module 6 also includes a resistor R13 (the resistance value can be 18Ω). One end of the resistor R13 is electrically connected to a current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R13 is electrically connected to the ground terminal of the thyristor dimming constant current module 2, the dual-channel PWM dimming constant current chip IC3, the color temperature control module 5, the power failure detection module 4, and the MCU linear power supply module 3, respectively.

[0050] Please refer to Figure 2 The dual-channel PWM dimming constant current module 6 also includes a resistor R14 (the resistance value can be 18Ω). One end of the resistor R14 is electrically connected to the other current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R14 is electrically connected to the ground terminal of the thyristor dimming constant current module 2, the dual-channel PWM dimming constant current chip IC3, the color temperature control module 5, the power failure detection module 4, and the MCU linear power supply module 3, respectively.

[0051] Please refer to Figure 2 The MCU linear power supply module 3 includes resistors R8 (33kΩ), R8A (33kΩ), R8B (33kΩ), and Zener diode ZD1 (4.7V). One end of resistor R8 is electrically connected to the SCR dimming constant current module 2, the dual-channel PWM dimming constant current module 6, and the load module 7. The other end of resistor R8 is electrically connected to one end of resistor R8A. The other end of resistor R8A is electrically connected to one end of resistor R8B. The other end of resistor R8B is electrically connected to the cathode of Zener diode ZD1 and the color temperature control module 5. The anode of Zener diode ZD1 is electrically connected to the color temperature control module 5, the dual-channel PWM dimming constant current module 6, and the SCR dimming constant current module 2. The bus voltage flows through resistors R8, R8A, and R8B, and is then regulated by Zener diode ZD1, ultimately providing a stable 4.7V constant voltage to power chip IC2.

[0052] Please refer to Figure 2 The thyristor dimming constant current module 2 includes a constant current thyristor dimming chip IC1. The constant current output terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module 3, the dual-channel PWM dimming constant current module 6, the color temperature control module 5, and the power failure detection module 4, respectively. The thyristor dimming terminal of the constant current thyristor dimming chip IC1 is electrically connected to the color temperature control module 5, the power failure detection module 4, and the dual-channel PWM dimming constant current module 6, respectively. Taking the BP5178 chip as an example, when the constant current thyristor dimming chip IC1 detects a phase shift in the rectifier bridge voltage through resistor R1 and determines that it is connected to the dimmer, the BLEED circuit inside the constant current thyristor dimming chip IC1 is turned on at a fixed time. The BLEED current flows through resistors R2 and R3 through the inside of the constant current thyristor dimming chip IC1, and then flows out through resistors R5, R6, and R7, ensuring that the dimmer has sufficient holding current. The circuit is turned off to ensure low-end dimming performance. The current from the yellow LED and the white LED flows through pins D1 and D2 respectively, then through resistors R13 and R14 respectively, and then through pin 7 (the drain of the internal MOS) of the constant current thyristor dimming chip IC1. Finally, it flows through resistors R6 and R7 back to the rectifier bridge and back to the power grid. Resistors R6 and R7 are used to limit the maximum current flowing through the constant current thyristor dimming chip IC1, which is the maximum combined current of the yellow LED and the white LED.

[0053] Please refer to Figure 2The thyristor dimming constant current module 2 also includes a resistor R4 (the resistance value can be 560kΩ). The constant current output terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module 3, the dual-channel PWM dimming constant current module 6, the color temperature control module 5 and the power failure detection module 4 through the resistor R4.

[0054] Please refer to Figure 2 The thyristor dimming constant current module 2 further includes resistors R1 (resistance value can be 1.5MΩ), R2 (resistance value can be 510Ω), and R3 (resistance value can be 510Ω). One end of resistor R1 is electrically connected to the thyristor dimming terminal of the constant current thyristor dimming chip IC1. The other end of resistor R1 is electrically connected to the rectifier bridge, one end of resistor R2, and the power failure detection module 4. The other end of resistor R2 is electrically connected to one end of resistor R3. The other end of resistor R3 is electrically connected to the voltage input terminal of the constant current thyristor dimming chip IC1.

[0055] The thyristor-controlled dimming constant current module 2 also includes diode D1 (either an ES1J diode), resistor R5 (2.4Ω), resistor R6 (6.8Ω), resistor R7 (8.2Ω), and electrolytic capacitor E1 (47μF). For the specific connection relationships between these components, please refer to [reference needed]. Figure 2 Diode D1 is used to isolate the voltage signal from the electrolytic capacitor E1, ensuring the reliability of the constant current SCR dimming chip IC1 in detecting the phase-cut voltage of the rectifier bridge. Resistor R5 is used to provide the BLEED current of the constant current SCR dimming chip IC1 and simultaneously set the current magnitude. Resistors R6 and R7 are used to set the current magnitude of the constant current SCR dimming chip IC1, thereby setting the maximum combined current value of the yellow LED and the white LED.

[0056] The rectifier and filter module 1 includes a fuse resistor F (resistance value can be 10Ω), a varistor RV (voltage value can be 240V), and a rectifier bridge BR (a rectifier bridge of model MB10F can be used). Please refer to [reference needed] for the specific connection relationships between its components. Figure 2 .

[0057] The load module 7 includes LEDs W1, W2, W3, W4, W5, W6, W7, W8, A1, A2, A3, A4, A5, A6, A7, and A8. For the specific connection relationships between these components, please refer to [reference needed]. ​ .

[0058] The power failure detection module 4 uses resistors R10, R11, and R12 to collect signals and detect the power failure status of the rectifier bridge BR. The signals are then processed by the chip IC2. When 5 power failures are detected in 3 seconds, PWM1 and PWM2 signals are output according to the ratio shown in Table 1 below. Each signal stays for 2 seconds and the cycle continues.

[0059]

[0060] Table 1

[0061] When the signal transitions to state 3, which is the desired 3500K, the wall switch is turned off. At this time, the VDD terminal (i.e., the power supply terminal) of chip IC2 is powered off, and the state 3 information is stored in the internal memory of chip IC2. When the power is turned on again, chip IC2 will operate according to state 3, that is, the light will turn on according to the user's wishes, thus realizing the power-off memory function.

[0062] The maximum total power of the entire lamp is determined by the sampling resistors R6 and R7, while the duty cycles of PWM1 and PWM2 control the current ratio of the high and low color temperature LEDs.

[0063] It can also provide color temperature switching options and multiple power switching options through specific switching requirements, such as switching 5 times within 3 seconds to enter state 1-10 cyclic switching, as shown in Table 2 below:

[0064]

[0065] Table 2

[0066] This solution utilizes the programmable IC2 chip, allowing for flexible adjustment of the PWM1 and PWM2 signals to meet the diverse functional and color temperature requirements of different users.

[0067] This solution offers a simple method for selecting color temperature, requiring only five on / off cycles in three seconds. It allows for continuous and rapid switching while avoiding the issue of incorrect color temperature and power switching caused by accidental on / off cycles during actual use.

[0068] This solution facilitates users' needs for uniformly adjusting the color temperature of multiple lights by connecting them in parallel and using a unified switch; it also makes it convenient for stores to display different color temperature lighting effects by switching colors.

[0069] In summary, this utility model provides a multi-color temperature and multi-power switching circuit compatible with SCR dimming. It includes a rectifier and filter module, a SCR dimming constant current module, an MCU linear power supply module, a power-down detection module, a color temperature control module, a dual-channel PWM dimming constant current module, and a load module. The input of the power-down detection module is electrically connected to the rectifier and filter module to detect power outages. By detecting whether the rectifier and filter module is powered down and the number of power outages, it determines whether the user has turned off the wall switch and how many times it has been switched on and off. The power-down detection module transmits the detected power outage information to the color temperature control module for identification processing. The color temperature control module outputs two different pulse width modulations. The signal is sent to the dual-channel PWM dimming constant current module, which controls the current value of the load module respectively, thereby achieving arbitrary current ratios for different channels and thus realizing different lighting color temperatures and power. This solution, through the cooperation between the rectification and filtering module, the SCR dimming constant current module, the MCU linear power supply module, the power failure detection module, the color temperature control module, the dual-channel PWM dimming constant current module and the load module, not only can it be compatible with SCR dimmers for power (brightness) adjustment, but it can also flexibly and conveniently switch color temperature and power at any time. At the same time, it avoids the problem of incorrect color temperature and power switching caused by accidental switching multiple times during actual use, thereby improving the customer's user experience.

[0070] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-color temperature and multi-power switching circuit compatible with silicon controlled rectifier (SCR) dimming, characterized in that, It includes a rectifier and filter module, a thyristor dimming constant current module, an MCU linear power supply module, a power failure detection module, a color temperature control module, a dual-channel PWM dimming constant current module, and a load module; The input terminal of the power failure detection module is electrically connected to the rectifier and filter module to detect the power failure status of the rectifier and filter module. The output terminal of the power failure detection module is electrically connected to the analog input terminal of the color temperature control module. The two pulse width modulation terminals of the color temperature control module are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module. The dual-channel PWM dimming constant current module is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, the power failure detection module, and the load module. The thyristor dimming constant current module is electrically connected to the rectifier and filter module, the power failure detection module, and the MCU linear power supply module. The MCU linear power supply module is electrically connected to the power failure detection module.

2. The multi-color temperature and multi-power switching circuit compatible with SCR dimming according to claim 1, characterized in that, The power failure detection module includes resistors R10, R11, and R12. One end of resistor R10 is electrically connected to the rectifier and filter module, and the other end of resistor R10 is electrically connected to one end of resistor R11. The other end of resistor R11 is electrically connected to one end of resistor R12 and one analog input terminal of the color temperature control module. The other end of resistor R12 is electrically connected to the MCU linear power supply module, the SCR dimming constant current module, and the dual-channel PWM dimming constant current module.

3. The multi-color temperature and multi-power switching circuit compatible with SCR dimming according to claim 1, characterized in that, The color temperature control module includes a chip IC2. The power supply terminal of the chip IC2 is electrically connected to the MCU linear power supply module. The two pulse width modulation terminals of the chip IC2 are respectively electrically connected to the two pulse width modulation terminals of the dual-channel PWM dimming constant current module. The analog input terminal of the chip IC2 is electrically connected to the output terminal of the power failure detection module. The ground terminal of the chip IC2 is electrically connected to the ground terminal of the MCU linear power supply module.

4. The multi-color temperature and multi-power switching circuit compatible with SCR dimming according to claim 1, characterized in that, The dual-channel PWM dimming constant current module includes a dual-channel PWM dimming constant current chip IC3. The two pulse width modulation terminals of the dual-channel PWM dimming constant current chip IC3 are electrically connected to the two pulse width modulation terminals of the color temperature control module, respectively. The ground terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, the power failure detection module, and the color temperature control module, respectively. The current input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the load module, and the voltage input terminal of the dual-channel PWM dimming constant current chip IC3 is electrically connected to the thyristor dimming constant current module, the MCU linear power supply module, and the load module, respectively.

5. The multi-color temperature and multi-power switching circuit compatible with SCR dimming according to claim 4, characterized in that, The dual-channel PWM dimming constant current module also includes a resistor R13. One end of the resistor R13 is electrically connected to a current detection terminal of the dual-channel PWM dimming constant current chip IC3, and the other end of the resistor R13 is electrically connected to the ground terminal of the thyristor dimming constant current module, the ground terminal of the dual-channel PWM dimming constant current chip IC3, the color temperature control module, the power failure detection module, and the MCU linear power supply module.

6. The multi-color temperature and multi-power switching circuit compatible with SCR dimming according to claim 5, characterized in that, The dual-channel PWM dimming constant current module also includes a resistor R14. One end of the resistor R14 is electrically connected to another current detection terminal of the dual-channel PWM dimming constant current chip IC3. The other end of the resistor R14 is electrically connected to the ground terminal of the thyristor dimming constant current module, the dual-channel PWM dimming constant current chip IC3, the color temperature control module, the power failure detection module, and the MCU linear power supply module, respectively.

7. The multi-color temperature and multi-power switching circuit compatible with thyristor dimming according to claim 1, characterized in that, The MCU linear power supply module includes resistors R8, R8A, R8B, and Zener diode ZD1. One end of resistor R8 is electrically connected to the SCR dimming constant current module, the dual-channel PWM dimming constant current module, and the load module, respectively. The other end of resistor R8 is electrically connected to one end of resistor R8A. The other end of resistor R8A is electrically connected to one end of resistor R8B. The other end of resistor R8B is electrically connected to the cathode of Zener diode ZD1 and the color temperature control module, respectively. The anode of Zener diode ZD1 is electrically connected to the color temperature control module, the dual-channel PWM dimming constant current module, and the SCR dimming constant current module, respectively.

8. The multi-color temperature and multi-power switching circuit compatible with thyristor dimming according to claim 1, characterized in that, The thyristor dimming constant current module includes a constant current thyristor dimming chip IC1. The constant current input terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module, the dual-channel PWM dimming constant current module, the color temperature control module, and the power failure detection module, respectively. The thyristor dimming terminal of the constant current thyristor dimming chip IC1 is electrically connected to the color temperature control module, the power failure detection module, and the dual-channel PWM dimming constant current module, respectively.

9. The multi-color temperature and multi-power switching circuit compatible with thyristor dimming according to claim 8, characterized in that, The thyristor dimming constant current module also includes a resistor R4. The constant current output terminal of the constant current thyristor dimming chip IC1 is electrically connected to the MCU linear power supply module, the dual-channel PWM dimming constant current module, the color temperature control module, and the power failure detection module through the resistor R4.

10. The multi-color temperature and multi-power switching circuit compatible with SCR dimming according to claim 8, characterized in that, The thyristor dimming constant current module also includes resistors R1, R2, and R3. One end of resistor R1 is electrically connected to the thyristor dimming terminal of the constant current thyristor dimming chip IC1. The other end of resistor R1 is electrically connected to the rectifier bridge, one end of resistor R2, and the power-down detection module. The other end of resistor R2 is electrically connected to one end of resistor R3. The other end of resistor R3 is electrically connected to the voltage input terminal of the constant current thyristor dimming chip IC1.

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