High-PF-value low-voltage DC frequency conversion fan lamp control circuit

Abstract

The utility model discloses a high PF value low voltage DC frequency conversion fan lamp control circuit comprising an electromagnetic compatibility circuit which is connected with commercial power and used for reducing electromagnetic interference, and the electromagnetic compatibility circuit is connected with a switch power supply circuit which is used for converting alternating current output by the electromagnetic compatibility circuit into direct current and supplying power to a fan lamp circuit after voltage reduction. A power factor correction circuit for improving the alternating current power factor value of the input side of the switching power supply circuit is connected between the output end of the electromagnetic compatibility circuit and the input end of the switching power supply circuit, and consists of three diodes, two electrolytic capacitors and a resistor; a small number of components are ingeniously combined and then integrated into the switching power supply circuit, the functions of improving the power factor of the switching power supply circuit and reducing harmonic waves are achieved, the product size does not need to be increased, and the production cost is greatly reduced.

Description

[Technical Field]

[0001] This utility model relates to a high PF value low voltage DC frequency converter fan light control circuit. [Background Technology]

[0002] Domestic and international certification requirements for low-voltage DC fan lights necessitate a high power factor (PF) and low energy efficiency. Therefore, existing low-voltage DC fan light controllers on the market achieve this by using dedicated PF chips, switching inductors, and MOSFETs, but this significantly increases costs. [Utility Model Content]

[0003] This invention overcomes the shortcomings of the prior art and provides a high PF value low voltage DC frequency converter fan light control circuit.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-PF low-voltage DC inverter fan light control circuit is characterized by: an electromagnetic compatibility (EMC) circuit connected to the mains power supply to reduce electromagnetic interference; an EMC circuit connected to a switching power supply circuit for converting the AC output of the EMC circuit into DC power and stepping down the voltage to supply power to the fan light circuit; a power factor correction circuit for improving the AC power factor of the input side of the switching power supply circuit connected between the output terminal of the EMC circuit and the input terminal of the switching power supply circuit; the power factor correction circuit includes an electrolytic capacitor EC1; the positive terminal of the electrolytic capacitor EC1 is connected to the negative terminal of diode D1 and the output terminal of the EMC circuit; the negative terminal of the electrolytic capacitor EC1 is connected to the positive terminal of diode D2 and the negative terminal of diode D5; the negative terminal of diode D2 is connected to the positive terminal of diode D1 and the positive terminal of electrolytic capacitor EC4 through a resistor R4; and the positive terminal of diode D5 and the negative terminal of electrolytic capacitor EC4 are grounded.

[0006] The high PF value low-voltage DC inverter fan light control circuit described above is characterized in that: the switching power supply circuit includes a switching power supply chip U4, pin 1 of the switching power supply chip U4 is grounded, pin 2 of the switching power supply chip U4 is connected to one end of capacitor C6 and the collector of the output side of optocoupler U1 respectively, the other end of capacitor C6 and the emitter of the output side of optocoupler U1 are grounded, pin 3 of the switching power supply chip U4 is grounded through capacitor C8, pin 4 of the switching power supply chip U4 is connected to one end of capacitor C10 and one end of resistor R22 respectively, the other end of capacitor C10 is grounded, the other end of resistor R22 is connected to one end of resistor R19, one end of resistor R17, one end of resistor R20, one end of resistor R21 and the drain terminal of MOSFET M1 respectively, and resistor R1... The other ends of resistors R9, R20, and R21 are grounded. The other end of resistor R17 is connected to one end of resistor R14, the gate of MOSFET M1, and the positive terminal of diode D7. The other end of resistor R14 is connected to the negative terminal of diode D7 and pin 6 of switching power supply chip U4. The source terminal of MOSFET M1 is connected to pin 3 of transformer T1. Pin 5 of switching power supply chip U4 is connected to the negative terminal of diode D6, one end of resistor R7, the positive terminal of electrolytic capacitor EC5, and one end of capacitor C2. The other end of capacitor C2 and the negative terminal of electrolytic capacitor EC5 are grounded. The positive terminal of diode D6 is connected to pin 5 of transformer T1 through resistor R10. The other end of resistor R7 is connected to the output terminal of electromagnetic compatibility circuit through resistor R3. One end of resistor R1, one end of resistor R2, one end of capacitor C1, and pin 1 of transformer T1 are connected. The other end of resistor R1 is connected to the other end of resistor R2, one end of resistor R6, and the other end of capacitor C1. The other end of resistor R6 is connected to the negative terminal of diode D3. The positive terminal of diode D3 is connected to pin 3 of transformer T1. Pin 4 of transformer T1 is grounded. Pin 10 of transformer T1 is connected to the positive terminal of diode D4. The negative terminal of diode D4 is connected to the positive terminals of electrolytic capacitors EC3 and EC2, one end of resistor R8, one end of resistor R11, and one end of resistor R13. Pin 9 of transformer T1, the negative terminals of electrolytic capacitors EC3 and EC2, and the other end of resistor R8 are grounded. The other end of resistor R11... One end is connected to one end of resistor R12 and the positive terminal of the input side of optocoupler U1. The negative terminal of the input side of optocoupler U1 is connected to the K terminal of parallel voltage regulator U3, the other end of resistor R12, and one end of capacitor C7. The R terminal of parallel voltage regulator U3 is connected to the other end of resistor R13, the other end of capacitor C7, one end of resistor R8, and one end of resistor R15. The A terminal of parallel voltage regulator U3, the other end of resistor R18, and the other end of resistor R15 are grounded. Pin 7 of transformer T1 is connected to the positive terminal of diode D8. The negative terminal of diode D8 is connected to the positive terminals of electrolytic capacitor EC7 and EC6. Pin 6 of transformer T1, the negative terminals of electrolytic capacitor EC7 and EC6 are grounded.The negative terminals of diodes D4 and D8 are connected to the fan and light circuit as the output terminals of the switching power supply circuit.

[0007] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the electromagnetic compatibility circuit includes a rectifier element DB1, pin 1 of the rectifier element DB1 is connected to one end of capacitor YC1, one end of capacitor XC1, one end of varistor TNR1, and one end of fuse F1 respectively, the other end of fuse F1 is connected to the mains live wire, pin 2 of the rectifier element DB1 is connected to one end of capacitor YC2, the other end of capacitor XC1, the other end of varistor TNR1, and the mains neutral wire respectively, the other end of capacitor YC1 and the other end of capacitor YC2 are respectively connected to the electrical functional ground, pin 4 of the rectifier element DB1 is grounded, and pin 3 of the rectifier element DB1 serves as the output terminal of the electromagnetic compatibility circuit and is connected to the switching power supply circuit.

[0008] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the fan light circuit includes an MCU control circuit for controlling the operation of LED lights and the fan; the MCU control circuit is connected to an LED light output control circuit for driving the LED lights, a fan output control circuit for driving the fan, a current sampling circuit for sampling the current of the fan output control circuit, and a DC step-down power supply circuit connected to a switching power supply circuit for stepping down the output power of the switching power supply circuit to supply power; the switching power supply circuit is connected to and supplies power to the LED light output control circuit and the fan output control circuit respectively.

[0009] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the MCU control circuit is connected to an infrared wireless receiving circuit for receiving infrared wireless remote control signals, and the DC step-down power supply circuit is connected to the infrared wireless receiving circuit for power supply.

[0010] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the MCU control circuit is connected to a WIFI wireless receiving circuit for receiving WIFU wireless remote control signals, and the DC step-down power supply circuit is connected to the WIFI wireless receiving circuit for power supply.

[0011] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the MCU control circuit is connected to an overcurrent detection circuit for overcurrent comparison, which is connected to the current sampling circuit and the DC step-down power supply circuit respectively.

[0012] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the MCU control circuit is connected to a bus voltage detection circuit that is connected to the output terminal of the switching power supply circuit for detecting the bus voltage.

[0013] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the MCU control circuit is connected to a buzzer prompting circuit for sound indication of working status and a light prompting circuit for light indication of working status, and the DC step-down power supply circuit is connected to the buzzer prompting circuit and the light prompting circuit respectively for power supply.

[0014] The high PF value low voltage DC inverter fan light control circuit described above is characterized in that: the MCU control circuit is connected to a programming interface circuit for programming the MCU control circuit, and the DC step-down power supply circuit is connected to the programming interface circuit for power supply.

[0015] The beneficial effects of this utility model are:

[0016] This invention features a power factor correction circuit that improves the AC power factor of the input side of the switching power supply circuit by connecting the output terminal of the electromagnetic compatibility circuit and the input terminal of the switching power supply circuit. The power factor correction circuit consists of three diodes, two electrolytic capacitors, and one resistor. By cleverly combining a few components and integrating them into the switching power supply circuit, the power factor of the switching power supply circuit can be improved and harmonics can be reduced without increasing the product size and greatly reducing production costs. [Image Description]

[0017] Figure 1 This is a schematic diagram of the present invention;

[0018] Figure 2 This is the circuit diagram of this utility model. [Detailed Implementation]

[0019] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0021] like Figure 1-2As shown, a high-PF low-voltage DC inverter fan light control circuit includes an electromagnetic compatibility circuit 11 connected to the mains power supply to reduce electromagnetic interference. The electromagnetic compatibility circuit 11 is connected to a switching power supply circuit 12 for converting the AC power output of the electromagnetic compatibility circuit 11 into DC power and then stepping down the voltage to supply power to the fan light circuit. A power factor correction circuit 13 is connected between the output terminal of the electromagnetic compatibility circuit 11 and the input terminal of the switching power supply circuit 12 to improve the AC power factor value of the input side of the switching power supply circuit 12. The power factor correction circuit 13 includes an electrolytic capacitor EC1. The positive terminal of the electrolytic capacitor EC1 is connected to the negative terminal of diode D1 and the output terminal of the electromagnetic compatibility circuit 11, respectively. The negative terminal of the electrolytic capacitor EC1 is connected to the positive terminal of diode D2 and the negative terminal of diode D5, respectively. The negative terminal of diode D2 is connected to the positive terminal of diode D1 and the positive terminal of electrolytic capacitor EC4 through a resistor R4, respectively. The positive terminal of diode D5 and the negative terminal of electrolytic capacitor EC4 are grounded. This invention cleverly combines a few components to form a power factor correction circuit, which is then integrated into the input of a switching power supply circuit. This improves the power factor to over 0.95, effectively reduces harmonic distortion and suppresses the generation of undesirable harmonics, and provides a high-power-factor, low-harmonic drive power supply to the fan-light circuit. Combined with a low-voltage DC fan-light circuit, this creates a high-power-factor, low-harmonic fan-light device that integrates a DC motor, LED light, and power supply, making it compliant with domestic and international certification standards.

[0022] like Figure 1-2As shown, the fan-light circuit includes an MCU control circuit 21 for controlling the operation of the LED light and the fan. The MCU control circuit 21 is connected to an LED light output control circuit 22 for driving the LED light, a fan output control circuit 23 for driving the fan, a current sampling circuit 24 for sampling the current of the fan output control circuit 23, and a DC step-down power supply circuit 25 connected to a switching power supply circuit 12 to step down the output power of the switching power supply circuit 12. The switching power supply circuit 12 is connected to and powers both the LED light output control circuit 22 and the fan output control circuit 23. The MCU control circuit 21 is also connected to an infrared wireless receiver circuit 26 for receiving infrared wireless remote control signals, and the DC step-down power supply circuit 25 is connected to and powers the infrared wireless receiver circuit 26. Furthermore, the MCU control circuit 21 is connected to a WIFI wireless receiver circuit 27 for receiving WIFU wireless remote control signals, and the DC step-down power supply circuit 25 is connected to and powers the WIFI wireless receiver circuit 27. In actual use, control signals can be sent to the infrared wireless receiving circuit 26 via remote control, or to the WIFI wireless receiving circuit 27 via a mobile phone or other smart device. After receiving the signals, the MCU control circuit 21 controls the LED output control circuit 22 and the fan output control circuit 23 to work, thereby driving the LED lights and the fan DC motor. At the same time, the current sampling circuit 24 samples the current of the fan output control circuit 23 and feeds it back to the MCU control circuit 21. The MCU control circuit 21 then adjusts the operation of the fan DC motor in real time through the fan output control circuit 23 based on the sampled current.

[0023] like Figure 2 As shown, after the mains power is input, electromagnetic interference compatibility processing is performed through components such as capacitor XC1, capacitor YC1, capacitor YC2 and rectifier DB1 in the electromagnetic compatibility circuit 11, thereby reducing electromagnetic interference in the mains power.

[0024] like Figure 2 As shown, the power output from the electromagnetic compatibility circuit 11 is fed into the switching power supply circuit 12 after the power factor is improved by the power factor correction circuit 13. The switching power supply circuit 12 converts the AC power into DC power and then steps it down to supply power to the fan light circuit through the switching power supply chip U4, optocoupler U1, transformer T1, TL431 parallel voltage regulator U3 and peripheral circuits.

[0025] like Figure 1-2 As shown, the MCU control circuit 21 is connected to an overcurrent detection circuit 28, which is connected to the current sampling circuit 24 and the DC step-down power supply circuit 25 respectively for overcurrent comparison. When the overcurrent detection circuit 28 detects an overcurrent in the fan DC motor, the MCU control circuit 21 controls the fan output control circuit 23 to stop working to achieve overcurrent protection.

[0026] like Figure 1-2 As shown, the MCU control circuit 21 is connected to a bus voltage detection circuit 29, which is connected to the output terminal of the switching power supply circuit 12 for detecting the bus voltage. When the bus voltage detection circuit 29 detects an overvoltage in the output voltage of the switching power supply circuit, the MCU control circuit 21 controls the LED output control circuit 22 and the fan output control circuit 23 to stop working to achieve overvoltage protection.

[0027] like Figure 1-2 As shown, the MCU control circuit 21 is connected to a buzzer indicator circuit 210 for audible indication of the working status and a light indicator circuit 211 for visual indication of the working status. A DC step-down power supply circuit 25 is connected to both the buzzer indicator circuit 210 and the light indicator circuit 211 for power supply. When the MCU control circuit 21 receives a control command and controls the LED output control circuit 22 and the fan output control circuit 23 to operate according to the command, audible and visual indications are provided through the buzzer indicator circuit 210 and the light indicator circuit 211, respectively.

[0028] like Figure 1-2 As shown, the MCU control circuit 21 is connected to a programming interface circuit 212 for programming the MCU control circuit 21, and the DC step-down power supply circuit 25 is connected to the programming interface circuit 212 for power supply. During programming, the programming interface circuit 212 is connected to the MCU control circuit 21 to program the MCU control circuit 21.

[0029] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A high PF value low-voltage DC inverter fan light control circuit, characterized in that: The system includes an electromagnetic compatibility circuit (11) connected to the mains power supply to reduce electromagnetic interference. The electromagnetic compatibility circuit (11) is connected to a switching power supply circuit (12) for converting the AC power output of the electromagnetic compatibility circuit (11) into DC power and stepping down the voltage to supply power to the fan lamp circuit. A power factor correction circuit (13) for improving the AC power factor of the input side of the switching power supply circuit (12) is connected between the output terminal of the electromagnetic compatibility circuit (11) and the input terminal of the switching power supply circuit (12). The power factor correction circuit (13) includes an electrolytic capacitor EC1. The positive terminal of the electrolytic capacitor EC1 is connected to the negative terminal of the diode D1 and the output terminal of the electromagnetic compatibility circuit (11). The negative terminal of the electrolytic capacitor EC1 is connected to the positive terminal of the diode D2 and the negative terminal of the diode D5. The negative terminal of the diode D2 is connected to the positive terminal of the diode D1 and the positive terminal of the electrolytic capacitor EC4 through a resistor R4. The positive terminal of the diode D5 and the negative terminal of the electrolytic capacitor EC4 are grounded.

2. The high PF value low voltage DC inverter fan light control circuit according to claim 1, characterized in that: The switching power supply circuit (12) includes a switching power supply chip U4. Pin 1 of the switching power supply chip U4 is grounded. Pin 2 of the switching power supply chip U4 is connected to one end of capacitor C6 and the collector of the output side of optocoupler U1, respectively. The other end of capacitor C6 and the emitter of the output side of optocoupler U1 are grounded. Pin 3 of the switching power supply chip U4 is grounded through capacitor C8. Pin 4 of the switching power supply chip U4 is connected to one end of capacitor C10 and one end of resistor R22, respectively. The other end of capacitor C10 is grounded. The other end of resistor R22 is connected to one end of resistor R19, one end of resistor R17, one end of resistor R20, one end of resistor R21, and the drain of MOSFET M1, respectively. The other ends of resistor R19, R20, and R21 are connected to the drain of MOSFET M1, respectively. The ends of resistor R17 are grounded respectively. The other end of resistor R17 is connected to one end of resistor R14, the gate of MOSFET M1, and the positive terminal of diode D7. The other end of resistor R14 is connected to the negative terminal of diode D7 and pin 6 of switching power supply chip U4. The source terminal of MOSFET M1 is connected to pin 3 of transformer T1. Pin 5 of switching power supply chip U4 is connected to the negative terminal of diode D6, one end of resistor R7, the positive terminal of electrolytic capacitor EC5, and one end of capacitor C2. The other end of capacitor C2 and the negative terminal of electrolytic capacitor EC5 are grounded respectively. The positive terminal of diode D6 is connected to pin 5 of transformer T1 through resistor R10. The other end of resistor R7 is connected to the output terminal of electromagnetic compatibility circuit (11), one end of resistor R1, and resistor R through resistor R3. One end of resistor R1 is connected to one end of capacitor C1 and pin 1 of transformer T1. The other end of resistor R1 is connected to the other end of resistor R2, one end of resistor R6, and the other end of capacitor C1. The other end of resistor R6 is connected to the negative terminal of diode D3. The positive terminal of diode D3 is connected to pin 3 of transformer T1. Pin 4 of transformer T1 is grounded. Pin 10 of transformer T1 is connected to the positive terminal of diode D4. The negative terminal of diode D4 is connected to the positive terminals of electrolytic capacitors EC3 and EC2, one end of resistor R8, one end of resistor R11, and one end of resistor R13. Pin 9 of transformer T1, the negative terminals of electrolytic capacitors EC3 and EC2, and the other end of resistor R8 are grounded. The other end of resistor R11 is connected to... One end of resistor R12 is connected to the positive terminal of the input side of optocoupler U1. The negative terminal of the input side of optocoupler U1 is connected to the K terminal of parallel voltage regulator U3, the other end of resistor R12, and one end of capacitor C7. The R terminal of parallel voltage regulator U3 is connected to the other end of resistor R13, the other end of capacitor C7, one end of resistor R8, and one end of resistor R15. The A terminal of parallel voltage regulator U3, the other end of resistor R18, and the other end of resistor R15 are grounded. Pin 7 of transformer T1 is connected to the positive terminal of diode D8. The negative terminal of diode D8 is connected to the positive terminals of electrolytic capacitor EC7 and EC6. Pin 6 of transformer T1, the negative terminals of electrolytic capacitor EC7 and EC6 are grounded.The negative terminals of diodes D4 and D8 are connected to the fan and lamp circuit as the output terminals of the switching power supply circuit (12).

3. The high PF value low voltage DC inverter fan light control circuit according to claim 1, characterized in that: The electromagnetic compatibility circuit (11) includes a rectifier DB1. Pin 1 of the rectifier DB1 is connected to one end of capacitor YC1, one end of capacitor XC1, one end of varistor TNR1, and one end of fuse F1. The other end of fuse F1 is connected to the mains live wire. Pin 2 of the rectifier DB1 is connected to one end of capacitor YC2, the other end of capacitor XC1, the other end of varistor TNR1, and the mains neutral wire. The other end of capacitor YC1 and capacitor YC2 are connected to the electrical functional ground. Pin 4 of the rectifier DB1 is grounded. Pin 3 of the rectifier DB1 is connected to the output terminal of the electromagnetic compatibility circuit (11) and the switching power supply circuit (12).

4. The high PF value low voltage DC inverter fan light control circuit according to claim 1, characterized in that: The fan light circuit includes an MCU control circuit (21) for controlling the operation of the LED light and the fan. The MCU control circuit (21) is connected to an LED light output control circuit (22) for driving the LED light, a fan output control circuit (23) for driving the fan, a current sampling circuit (24) for sampling the current of the fan output control circuit (23), and a DC step-down power supply circuit (25) connected to the switching power supply circuit (12) for stepping down the output power of the switching power supply circuit (12) to supply power. The switching power supply circuit (12) is connected to the LED light output control circuit (22) and the fan output control circuit (23) for power supply respectively.

5. The high PF value low voltage DC inverter fan light control circuit according to claim 4, characterized in that: The MCU control circuit (21) is connected to an infrared wireless receiving circuit (26) for receiving infrared wireless remote control signals, and the DC step-down power supply circuit (25) is connected to the infrared wireless receiving circuit (26) for power supply.

6. The high PF value low voltage DC inverter fan light control circuit according to claim 4, characterized in that: The MCU control circuit (21) is connected to a WIFI wireless receiver circuit (27) for receiving WIFU wireless remote control signals, and the DC step-down power supply circuit (25) is connected to the WIFI wireless receiver circuit (27) for power supply.

7. The high PF value low voltage DC inverter fan light control circuit according to claim 4, characterized in that: The MCU control circuit (21) is connected to an overcurrent detection circuit (28) which is connected to the current sampling circuit (24) and the DC step-down power supply circuit (25) respectively for overcurrent comparison.

8. A high PF value low voltage DC inverter fan light control circuit according to claim 4, characterized in that: The MCU control circuit (21) is connected to a bus voltage detection circuit (29) which is connected to the output terminal of the switching power supply circuit (12) for detecting the bus voltage.

9. The high PF value low voltage DC frequency converter fan light control circuit according to claim 4, characterized in that: The MCU control circuit (21) is connected to a buzzer prompting circuit (210) for sound prompting of working status and a light prompting circuit (211) for light prompting of working status. The DC step-down power supply circuit (25) is connected to the buzzer prompting circuit (210) and the light prompting circuit (211) for power supply respectively.

10. A high PF value low voltage DC inverter fan light control circuit according to claim 4, characterized in that: The MCU control circuit (21) is connected to a programming interface circuit (212) for programming the MCU control circuit (21), and the DC step-down power supply circuit (25) is connected to the programming interface circuit (212) for power supply.

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