A dual-voltage to single-voltage constant voltage dimming controller

Abstract

This utility model discloses a dual-voltage to single-voltage constant-voltage dimming controller, including a controller housing and a control motherboard disposed within the controller housing. The control motherboard includes an MCU main control module, a dual-voltage to single-voltage module connected to the MCU main control module, a DC-DC step-down module, and an LED driver module. The LED driver module is connected to a 12V constant-voltage LED strip. The dual-voltage to single-voltage module outputs 12V voltage whether connected to a 12V or 24V power supply. The 12V voltage is split into two paths: one path connects to the LED driver module, and the other path connects to the DC-DC step-down module. The DC-DC step-down module reduces the 12V voltage to 5V to supply the MCU main control module. This solution ensures that both 12V and 24V input voltages for the LED strip power supply result in a 12V output, and by uniformly installing 12V constant-voltage LED strips, it avoids the possibility of connecting a 24V LED strip power supply to a 12V constant-voltage LED strip, thereby mitigating the safety hazard of fire.

Description

Technical Field

[0001] This disclosure relates to the field of lighting control technology, and in particular to a dual-voltage to single-voltage constant voltage dimming controller for constant voltage LED strips. Background Technology

[0002] With the rapid development of LED technology, more and more families are using constant voltage LED strips, installed in cabinets for decorative lighting. Constant voltage LED strips rely on a stable voltage supply, generally either 12V or 24V. The 220V AC mains power is connected to the strip's power supply, converting the high-voltage AC power into low-voltage DC power for the strip. The voltage of the strip's power supply and controller must be compatible with the strip's driving voltage. That is, if the strip's power supply output voltage is 24V, the strip's driving voltage must also be 24V. Using 24V to power a 12V strip will damage the strip and could even cause a fire. Conversely, if the power supply output voltage is 12V, the strip's driving voltage must also be 12V. Using 12V to power a 24V strip will result in a dim or non-functional strip. Some users are unaware whether their installed strip power supply is 12V or 24V. Connecting a 24V power supply to a 12V strip with a 12V driver poses a significant safety hazard. Utility Model Content

[0003] The purpose of this solution is to equip the controller connected to the LED strip power supply with a dual-voltage to single-voltage constant voltage dimming controller that converts both 12V and 24V power supplies to 12V to power the LED strip drive circuit, so as to solve the safety hazard caused by the above-mentioned 12V LED strip being mistakenly connected to a 24V LED strip power supply.

[0004] The specific technical solution of this invention is as follows: a dual-voltage to single-voltage constant-voltage dimming controller, comprising a controller housing and a control motherboard disposed within the controller housing. The control motherboard includes an MCU main control module, a dual-voltage to single-voltage module connected to the MCU main control module, a DC-DC step-down module, and an LED driver module. The LED driver module is connected to a 12V constant-voltage LED strip. The dual-voltage to single-voltage module outputs 12V voltage when connected to either a 12V or 24V power supply. The 12V voltage is split into two paths: one path connects to the LED driver module, and the other path connects to the DC-DC step-down module, which reduces the 12V voltage to 5V. Preferably, the MCU main control module is a CA51F003T3 microcontroller.

[0005] The dual-voltage to single-voltage module further includes an input terminal Vin+, an output terminal VCC, a step-down chip U6, resistors R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R33, R34, R36, R37, R39, R40, NPN transistors Q3 and Q5, PNP transistor Q4, NMOS transistor Q6, PMOS transistor Q8, capacitors C12, C13, C15, C16, electrolytic capacitors E3, E4, E5, E6, and diodes D3, D4, and D5. The input terminal Vin+ and the output terminal VCC are connected in parallel to form two circuits: one is a 12V direct-through circuit, and the other is a 24V to 12V step-down circuit.

[0006] Further, the 12V voltage pass-through circuit consists of PMOS transistor Q8, with its source (S) and drain (D) terminals connected to the input terminal Vin+ and the output terminal VCC, respectively. The gate (G) terminal of PMOS transistor Q8 is connected to resistors R36 and R37 in series. Resistors R36 and R37 are connected to the collector (C) terminal of NPN transistor Q5. The base (B) terminal of NPN transistor Q5 is connected to resistor R33. The other end of resistor R33 is connected to the MCU main control module. The emitter (E) terminal of NPN transistor Q5 is grounded. Resistors R20 and R21 are connected in series between the input terminal Vin+ and ground. An ADIN node is connected between resistors R20 and R21. Capacitor C12 is connected in parallel with resistor R21 and is grounded together. Electrolytic capacitors E3 and E4 are connected in parallel between the input terminal Vin+ and ground.

[0007] Furthermore, the buck converter U6 in the 24V to 12V step-down circuit uses the H6201L chip. The drain (D) of NMOS transistor Q6 is connected to the input terminal Vin+, and the source (S) of NMOS transistor Q6 is connected to one end of resistor R28. The other end of resistor R28 is connected to one end of inductor L2, and the other end of inductor L2 is connected to the output terminal VCC. Resistor R39 and capacitor C15 are connected between the drain and source of NMOS transistor Q6. Pin 1, DRV, of buck converter U6 is connected to NPN transistor Q. The base (B) of transistor L3 and the base (B) of PNP transistor Q4, the emitter (E) of NPN transistor Q3 and the emitter (E) of PNP transistor Q4 are connected to the gate (G) of NMOS transistor. The collector (C) of NPN transistor Q3 is connected to resistor R24, and the other end of resistor R24 ​​is connected to the input terminal Vin+. The collector (C) of PNP transistor Q4 is grounded. The output terminal of inductor L2 is connected to the anode of diode D3. The cathode of diode D3 is connected to resistor R23. The other end of resistor R23 is connected to resistor R22, and the other end of resistor R22 is connected to V... The in+ pin is connected to the second pin (VDD) of the buck converter U6, where resistors R22 and R23 are connected. The third pin (VFB) of the buck converter U6 is connected to resistors R25 and R26. The other end of resistor R25 is connected to capacitor C13, and the other end of capacitor C13 is connected between resistors R22 and R23. The other end of resistor R26 is connected between the anode of diode D3 and the output terminal of inductor L2. The seventh pin (VSS) of the buck converter U6 is connected to SGND, the signal ground, and shares the same ground plane with the anode of diode D5, one end of capacitor C16, one end of resistor R40, the cathodes of electrolytic capacitors E5 and E6, and one end of resistors R27 and R34. Diodes D4 and D5 are connected in reverse parallel. The positive terminals of electrolytic capacitors E5 and E6 and one end of resistors R27 and R34 are connected to the output terminal VCC. The negative terminals of electrolytic capacitors E5 and E6 and the other ends of resistors R27 and R34 are connected to GND (ground).

[0008] The DC-DC step-down module further includes a DC-DC power chip U1, diodes D1 and D2, resistors R1, R2, and R3, capacitors C1 and C2, and electrolytic capacitors E1 and E2. The DC-DC power chip U1 is an XL34063 chip. The Vin+ positive input is connected to the anode of diode D1. The cathode of diode D1 is split into two paths: one path is connected to the VCC pin of the DC-DC power chip U1, and the other path is connected to capacitor C1 and electrolytic capacitor E1 to GND. Resistor R1 is connected in series with the cathode of diode D1, and the other end of resistor R1 is connected to the IPK pin of the DC-DC power chip U1. The Input pin of U1 is connected to resistor R2, and the other end of resistor R2 is connected to GND. The Input pin of DC-DC power chip U1 is connected to resistor R3, and the other end of resistor R3 is connected to inductor L1. The other end of inductor L1 is connected to the SW_Collector pin of DC-DC power chip U1. Electrolytic capacitor E2 and diode D2 are connected between resistor R3 and inductor L1 and between inductor L1 and SW_Collector pin. The Timing_Cap pin of DC-DC power chip U1 is connected to capacitor C2. The other end of capacitor C2, the negative terminal of electrolytic capacitor E2, and the anode terminal of diode D2 are grounded together.

[0009] Furthermore, the DC-DC step-down module also includes step-down regulator chips U2, C3, C4, C5, C6, C7, and C8. The step-down regulator chip U2 is an AMS1117-3.3V model. The VIN pin of the step-down regulator chip U2 is connected to +5V, and the voltage is stepped down to +3.3V for output. Capacitors C3, C4, and C5 are connected in parallel between the +5V input terminal and GND, and capacitors C6, C7, and C8 are connected in parallel between the +3.3V output terminal and GND.

[0010] Furthermore, the DC-DC step-down module and the MCU main control module are connected to an RF 2.4G transceiver module, a WIFI transceiver module, and an indicator light module.

[0011] Furthermore, the DC-DC step-down module and the MCU main control module are also connected to a reset button module and an expansion interface module.

[0012] The beneficial effects of this utility model are as follows: For the constant voltage LED strip power supply of cabinet lighting and decorative lighting in smart home installations, regardless of whether the constant voltage LED strip power supply outputs 12V or 24V, by installing and connecting the controller of this solution, and through the circuit module settings of the main control board of this solution's controller, the dual-voltage to single-voltage module can identify whether the voltage of the connected LED strip power supply is 12V or 24V. When the connected voltage is 12V, the MCU main control module controls the NPN transistor Q5 to conduct, and then the PMOS transistor Q8 conducts, and the input terminal Vin+ and the output terminal VCC are directly connected through the PMOS transistor Q8 to output 12V voltage. When the connected voltage is 24V, the MCU main control module controls the NPN transistor Q5 to deconduct, and then the PMOS transistor Q8 to deconduct. At this time, the 24V voltage enters the 24V to 12V step-down circuit of the dual-voltage to single-voltage module, reducing the 24V voltage to 12V output. The corresponding constant voltage light strips use a uniform 12V constant voltage light strip to avoid the situation where a 24V light strip power supply is connected to a 12V constant voltage light strip, thereby avoiding the possibility of fire and promoting electrical safety. Attached Figure Description

[0013] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this disclosure together with the specification and serve to explain the principles of this disclosure.

[0014] Figure 1 A schematic block diagram of the control motherboard circuit structure provided for an embodiment of this utility model.

[0015] Figure 2 The schematic diagram of the MCU main control module circuit provided for the embodiment of this utility model.

[0016] Figure 3 The circuit diagram of the dual-voltage to single-voltage module provided in this embodiment of the utility model is shown.

[0017] Figure 4 The schematic diagram of the DC-DC step-down module provided in this embodiment of the utility model.

[0018] Figure 5 The schematic diagram of the LED driver module provided in the embodiment of this utility model.

[0019] Figure 6 The schematic diagram of the RF2.4G transceiver module provided for the embodiments of this utility model.

[0020] Figure 7 The schematic diagram of the WIFI transceiver module provided in the embodiment of this utility model.

[0021] Figure 8 The schematic diagram of the indicator module circuit provided in this embodiment of the utility model.

[0022] Figure 9 The circuit schematic diagram of the expansion interface module provided in the embodiment of this utility model.

[0023] Figure 10 The schematic diagram of the reset button module circuit provided in the embodiment of this utility model. Detailed Implementation

[0024] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this disclosure.

[0025] like Figures 1 to 10 The image shows a specific embodiment of a dual-voltage to single-voltage constant-voltage dimming controller disclosed in this solution. In this embodiment, the controller includes a controller housing and a control motherboard disposed within the controller housing. The control motherboard includes an MCU main control module, a dual-voltage to single-voltage module connected to the MCU main control module, a DC-DC step-down module, and an LED driver module. The LED driver module is connected to a 12V constant-voltage LED strip. The dual-voltage to single-voltage module outputs 12V voltage when connected to either a 12V or 24V power supply. The 12V voltage is split into two paths: one path connects to the LED driver module, and the other path connects to the DC-DC step-down module, which reduces the 12V voltage to 5V. Preferably, the MCU main control module is a CA51F003T3 microcontroller.

[0026] like Figure 3 As shown, the dual-voltage to single-voltage module includes an input terminal Vin+, an output terminal VCC, a step-down chip U6, resistors R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R33, R34, R36, R37, R39, R40, NPN transistors Q3 and Q5, PNP transistor Q4, NMOS transistor Q6, PMOS transistor Q8, capacitors C12, C13, C15, C16, electrolytic capacitors E3, E4, E5, E6, and diodes D3, D4, and D5. The input terminal Vin+ and the output terminal VCC are connected in parallel to form two circuits: one is a 12V direct-through circuit, and the other is a 24V to 12V step-down circuit.

[0027] Specifically, the 12V voltage direct-through circuit consists of PMOS transistor Q8, whose source (S) and drain (D) terminals are connected to the input terminal Vin+ and the output terminal VCC, respectively; the gate (G) terminal of PMOS transistor Q8 is connected to resistors R36 and R37 in series; resistors R36 and R37 are connected to the collector (C) terminal of NPN transistor Q5; the base (B) terminal of NPN transistor Q5 is connected to resistor R33; the other end of resistor R33 is connected to the MCU main control module; and the emitter (E) terminal of NPN transistor Q5 is grounded. Resistors R20 and R21 are connected in series between the input terminal Vin+ and ground; an ADIN node is connected between resistors R20 and R21; capacitor C12 is connected in parallel with resistor R21 and is grounded together; and electrolytic capacitors E3 and E4 are connected in parallel between the input terminal Vin+ and ground. A voltage divider network consisting of resistors R37 and R36 is used. Resistor R36 is connected between the collector of NPN transistor Q5 and the gate of PMOS transistor Q8. When a 12V voltage is input to the Vin+ terminal, the MCU main control module controls NPN transistor Q5 to conduct, which in turn turns on PMOS transistor Q8. The input Vin+ and output VCC are directly connected through PMOS transistor Q8, indicating that the connected LED strip power supply is a 12V power supply compatible with this solution. This 12V power supply is divided into two paths: one to power the LED driver module, and the other to a DC-DC step-down module for step-down to 5V. When a 24V voltage is input to the Vin+ terminal, the MCU main control module controls NPN transistor Q5 to de-conduct, which in turn turns on PMOS transistor Q8. The 24V power supply then enters the 24V to 12V step-down circuit for step-down to 12V output.

[0028] Furthermore, the buck converter U6 in the 24V to 12V step-down circuit uses the H6201L chip. The drain (D) of NMOS transistor Q6 is connected to the input terminal Vin+, and the source (S) of NMOS transistor Q6 is connected to one end of resistor R28. The other end of resistor R28 is connected to one end of inductor L2, and the other end of inductor L2 is connected to the output terminal VCC. Resistor R39 and capacitor C15 are connected between the drain and source of NMOS transistor Q6. Pin 1, DRV, of buck converter U6 is connected to NPN transistor Q. The base (B) of transistor L3 and the base (B) of PNP transistor Q4, the emitter (E) of NPN transistor Q3 and the emitter (E) of PNP transistor Q4 are connected to the gate (G) of NMOS transistor. The collector (C) of NPN transistor Q3 is connected to resistor R24, and the other end of resistor R24 ​​is connected to the input terminal Vin+. The collector (C) of PNP transistor Q4 is grounded. The output terminal of inductor L2 is connected to the anode of diode D3. The cathode of diode D3 is connected to resistor R23. The other end of resistor R23 is connected to resistor R22, and the other end of resistor R22 is connected to V... The in+ pin is connected to the second pin (VDD) of the buck converter U6, where resistors R22 and R23 are connected. The third pin (VFB) of the buck converter U6 is connected to resistors R25 and R26. The other end of resistor R25 is connected to capacitor C13, and the other end of capacitor C13 is connected between resistors R22 and R23. The other end of resistor R26 is connected between the anode of diode D3 and the output terminal of inductor L2. The seventh pin (VSS) of the buck converter U6 is connected to SGND, the signal ground, and shares the same ground plane with the anode of diode D5, one end of capacitor C16, one end of resistor R40, the cathodes of electrolytic capacitors E5 and E6, and one end of resistors R27 and R34. Diodes D4 and D5 are connected in reverse parallel. The positive terminals of electrolytic capacitors E5 and E6 and one end of resistors R27 and R34 are connected to the output terminal VCC. The negative terminals of electrolytic capacitors E5 and E6 and the other ends of resistors R27 and R34 are connected to GND (ground). The circuit design described above reduces the input 24V voltage to 12V output.

[0029] like Figure 4As shown, the DC-DC step-down module includes a DC-DC power chip U1, diodes D1 and D2, resistors R1, R2, and R3, capacitors C1 and C2, and electrolytic capacitors E1 and E2. The DC-DC power chip U1 is an XL34063 chip. The Vin+ positive input is connected to the anode of diode D1. The cathode of diode D1 is split into two paths: one path is connected to the VCC pin of the DC-DC power chip U1, and the other path is connected to capacitor C1 and electrolytic capacitor E1 to GND. Resistor R1 is connected in series with the cathode of diode D1. The other end of resistor R1 is connected to the IPK pin of the DC-DC power chip U1. The Input pin of DC-DC power chip U1 is connected to resistor R2, with the other end of R2 connected to GND. The Input pin of DC-DC power chip U1 is connected to resistor R3, with the other end of R3 connected to inductor L1. The other end of inductor L1 is connected to the SW_Collector pin of DC-DC power chip U1. An electrolytic capacitor E2 and a diode D2 are connected between resistor R3 and inductor L1, and between inductor L1 and the SW_Collector pin. The Timing_Cap pin of DC-DC power chip U1 is connected to capacitor C2. The other end of capacitor C2, the negative terminal of electrolytic capacitor E2, and the anode terminal of diode D2 are all grounded. Through DC-DC power chip U1 and the above circuit, the 12V power output from the dual-voltage to single-voltage module is stepped down to 5V.

[0030] Furthermore, the DC-DC buck module also includes buck regulator chips U2, C3, C4, C5, C6, C7, and C8. Buck regulator chip U2 is an AMS1117-3.3V model. The VIN pin of buck regulator chip U2 is connected to +5V, and the voltage is stepped down to +3.3V output. Capacitors C3, C4, and C5 are connected in parallel between the +5V input terminal and GND, and capacitors C6, C7, and C8 are connected in parallel between the +3.3V output terminal and GND. Through buck regulator chip U2 and the above circuitry, the 5V voltage is further reduced to 3.3V output.

[0031] like Figure 5 The diagram shows the LED driver circuit of the LED driver module. The 12V voltage input VCC terminal of the dual-voltage to single-voltage module is connected to the PWM pin of the MCU main control module via resistor R16. The other end of resistor R16 is connected to the base (B) of NPN transistor Q1 and PNP transistor Q2. The emitter (E) of NPN transistor Q1 and PNP transistor Q2 is connected to the gate (G) of NMOS transistor Q7. The drain (D) of NMOS transistor Q7 is connected to the LED strip interface CN1. The source (S) of NMOS transistor Q7 is grounded. A capacitor C14 is connected in parallel between VCC and GND to smooth the power supply voltage and reduce fluctuations.

[0032] like Figures 6 to 8As shown, the DC-DC step-down module and the MCU main control module are connected to an RF 2.4G transceiver module, a WIFI transceiver module, and an indicator light module. The RF 2.4G transceiver module uses the LT8920 2.4GHz wireless transceiver chip, enabling 2.4GHz wireless control of the light strip via a remote control. The WIFI transceiver module uses the WBR3 3.3V low-power embedded chip, which pairs with the APP terminal to control the light strip via a WIFI wireless network. The indicator light module displays a green light when controlled by the remote control and a blue light when controlled via the APP terminal using the WIFI wireless network, allowing for intuitive monitoring of the control status. The 3.3V output from the DC-DC step-down module supplies power to the RF 2.4G transceiver module and the WIFI transceiver module, while the 5V power supply supplies power to the indicator light module.

[0033] like Figure 9 , Figure 10 As shown, the DC-DC step-down module and the MCU main control module are also connected to a reset button module and an expansion interface module. The reset button sends a reset signal to the MCU main control module to restore factory settings and reset the WIFI transceiver module. The expansion interface module includes two expansion interfaces, H1 and H2, for connecting external wired touch button modules, infrared sensor modules, mechanical button modules, voice control modules, or radar sensor modules. The 5V output from the DC-DC step-down module supplies power to the reset button module and the expansion interfaces.

[0034] The parts not described in detail in this technical solution specification are obvious to those skilled in the art and can be supplemented and improved based on existing technical knowledge. At the same time, those skilled in the art should understand that the above embodiments are merely preferred embodiments of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A dual-voltage to single-voltage constant voltage dimming controller, comprising a controller housing and a control mainboard disposed within the controller housing, characterized in that, The control motherboard includes an MCU main control module, a dual-voltage to single-voltage module connected to the MCU main control module, a DC-DC step-down module, and an LED driver module. The LED driver module is connected to a 12V constant voltage LED strip. The dual-voltage to single-voltage module outputs 12V voltage when connected to a 12V or 24V power supply. The 12V voltage is divided into two paths: one path is connected to the LED driver module, and the other path is connected to the DC-DC step-down module. The DC-DC step-down module reduces the 12V voltage to 5V.

2. The dual-to-single voltage constant voltage dimmer controller of claim 1, wherein, The MCU main control module uses a CA51F003T3 microcontroller.

3. The dual-to-single voltage constant voltage dimmer controller of claim 2, wherein, The dual-voltage to single-voltage module includes an input terminal Vin+, an output terminal VCC, a step-down chip U6, resistors R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R33, R34, R36, R37, R39, R40, NPN transistors Q3 and Q5, PNP transistor Q4, NMOS transistor Q6, PMOS transistor Q8, capacitors C12, C13, C15, C16, electrolytic capacitors E3, E4, E5, E6, and diodes D3, D4, and D5. The input terminal Vin+ and the output terminal VCC are connected in parallel to form two circuits: one is a 12V direct-through circuit, and the other is a 24V to 12V step-down circuit.

4. The dual-voltage to single-voltage constant voltage dimming controller according to claim 3, characterized in that, The 12V voltage direct-through circuit consists of PMOS transistor Q8, with its source (S) and drain (D) terminals connected to the input Vin+ and output VCC, respectively. The gate (G) terminal of PMOS transistor Q8 is connected to resistors R36 and R37 in series. Resistors R36 and R37 are connected to the collector (C) terminal of NPN transistor Q5. The base (B) terminal of NPN transistor Q5 is connected to resistor R33. The other end of resistor R33 is connected to the MCU main control module. The emitter (E) terminal of NPN transistor Q5 is grounded. Resistors R20 and R21 are connected in series between the input Vin+ terminal and ground. An ADIN node is connected between resistors R20 and R21. Capacitor C12 is connected in parallel with resistor R21 and both are grounded. Electrolytic capacitors E3 and E4 are connected in parallel between the input Vin+ terminal and ground.

5. The dual-to-single voltage constant voltage dimmer controller of claim 3, wherein, The step-down chip U6 in the 24V to 12V step-down circuit is an H6201L chip. The drain (D) of NMOS transistor Q6 is connected to the input terminal Vin+, and the source (S) of NMOS transistor Q6 is connected to one end of resistor R28. The other end of resistor R28 is connected to one end of inductor L2, and the other end of inductor L2 is connected to the output terminal VCC. Resistor R39 and capacitor C15 are connected between the drain and source of NMOS transistor Q6. Pin 1 (DRV) of the buck converter U6 is connected to the base (B) of NPN transistor Q3 and the base (B) of PNP transistor Q4. The emitters (E) of NPN transistor Q3 and PNP transistor Q4 are connected to the gate (G) of an NMOS transistor. The collector (C) of NPN transistor Q3 is connected to resistor R24, and the other end of resistor R24 ​​is connected to the input terminal Vin+. The collector (C) of PNP transistor Q4 is grounded. The output of inductor L2 is connected to the anode of diode D3. The cathode of diode D3 is connected to resistor R23, and the other end of resistor R23 is connected to resistor R22. The other end of resistor R22 is connected to Vin+. Resistors R22 and R23 are connected to pin 2 (VDD) of the buck converter U6. Pin 3 (VFB) of the buck converter U6 is connected to resistors R25 and R26, and the other end of resistor R25 is connected to... Connect capacitor C13. The other end of capacitor C13 is connected between resistors R22 and R23. The other end of resistor R26 is connected between the anode of diode D3 and the output terminal of inductor L2. Pin VSS of step-down chip U6 is connected to SGND signal ground, sharing the same ground plane with the anode of diode D5, one end of capacitor C16, one end of resistor R40, the cathodes of electrolytic capacitors E5 and E6, and one end of resistors R27 and R34. Diodes D4 and D5 are connected in reverse parallel. The positive terminals of electrolytic capacitors E5 and E6 and one end of resistors R27 and R34 are connected to the output terminal VCC. The negative terminals of electrolytic capacitors E5 and E6 and the other end of resistors R27 and R34 are connected to GND ground.

6. The dual-to-single voltage constant voltage dimmer controller of claim 2, wherein, The DC-DC step-down module includes a DC-DC power chip U1, diodes D1 and D2, resistors R1, R2, and R3, capacitors C1 and C2, and electrolytic capacitors E1 and E2. The DC-DC power chip U1 is an XL34063 chip. The Vin+ positive input is connected to the anode of diode D1. The cathode of diode D1 is split into two paths: one path is connected to the VCC pin of the DC-DC power chip U1, and the other path is connected to capacitor C1 and electrolytic capacitor E1 to GND. Resistor R1 is connected in series with the cathode of diode D1. The other end of resistor R1 is connected to the IPK pin of the DC-DC power chip U1. The Input pin of DC-DC power chip U1 is connected to resistor R2, and the other end of resistor R2 is connected to GND. The Input pin of DC-DC power chip U1 is connected to resistor R3, and the other end of resistor R3 is connected to inductor L1. The other end of inductor L1 is connected to the SW_Collector pin of DC-DC power chip U1. Electrolytic capacitor E2 and diode D2 are connected between resistor R3 and inductor L1 and between inductor L1 and SW_Collector pin. The Timing_Cap pin of DC-DC power chip U1 is connected to capacitor C2. The other end of capacitor C2, the negative terminal of electrolytic capacitor E2, and the anode terminal of diode D2 are grounded together.

7. The dual-to-single voltage constant voltage dimmer controller of claim 6, wherein, The DC-DC step-down module also includes step-down regulator chips U2, C3, C4, C5, C6, C7, and C8. The step-down regulator chip U2 is an AMS1117-3.3V chip. The VIN pin of the step-down regulator chip U2 is connected to +5V and stepped down to +3.3V output. Capacitors C3, C4, and C5 are connected in parallel between the +5V input terminal and GND, and capacitors C6, C7, and C8 are connected in parallel between the +3.3V output terminal and GND.

8. The dual-to-single voltage constant voltage dimmer controller of claim 7, wherein, The DC-DC step-down module and the MCU main control module are connected to an RF 2.4G transceiver module, a WIFI transceiver module, and an indicator light module.

9. The dual-to-single voltage constant voltage dimmer controller of claim 8, wherein, The DC-DC step-down module and the MCU main control module are also connected to a reset button module and an expansion interface module.

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