AC voltage automatic conversion circuit
Through the combined circuit of anti-interference module, rectifier module, voltage module and adjustment module, the problem of AC conversion of different nominal voltages is solved, and the stable power supply of AC power equipment is achieved to avoid equipment damage.
Patent Information
- Application Number
- CN202422483602.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-14
AI Technical Summary
The prior art cannot effectively convert alternating current at different nominal voltages into the operating voltage required for electrical equipment, resulting in the equipment being unable to start normally or overvoltage damage.
The combined circuit of anti-interference module, rectifier module, voltage module and regulation module is adopted to automatically adjust the input voltage through components such as resistors, capacitors, inductors and rectifier bridges.
Automatic adjustment of AC power for different nominal voltages is achieved to ensure stable power supply of AC power equipment and avoid equipment damage.
Smart Images
Figure CN223219010U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of voltage conversion, in particular to an AC voltage automatic conversion circuit. Background Art
[0002] The efficient operation of electrical equipment mainly depends on a stable AC power supply that meets the specific operating voltage of the electrical equipment itself.
[0003] Currently, AC power has a wide range of nominal voltages, with common standards including 110V, 130V, and 220V. Some of these nominal voltages do not directly match the operating voltage requirements of electrical equipment, posing the risk of equipment not starting properly or even causing overvoltage damage and shortening its lifespan.
[0004] Therefore, how to effectively convert alternating current with different nominal voltages into the operating voltage required by electrical equipment is an urgent problem to be solved. Utility Model Content
[0005] The purpose of the utility model is to provide an AC voltage automatic conversion circuit to automatically adjust the input AC power of different nominal voltages so as to power AC electrical equipment.
[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0007] An AC voltage automatic conversion circuit comprises an anti-interference module, a rectifier module, a voltage module, a regulating module and an output module, wherein the input end of the anti-interference module is used to connect to an AC power supply; the input end of the rectifier module is connected to the output end of the anti-interference module; the input end of the voltage module is connected to the output end of the anti-interference module; the input end of the regulating module is connected to the output end of the anti-interference module; and the input end of the output module is connected to the output end of the rectifier module, the output end of the regulating module, the output end of the anti-interference module and the output end of the voltage module.
[0008] A further solution is: the anti-interference module includes a first anti-interference unit and a second anti-interference unit; the first anti-interference unit includes a resistor R1, a capacitor C1 and an inductor L1; one end of the resistor R1, one end of the capacitor C1, and pin 1 of the inductor L1 are all used to connect to the first output end of the AC power supply; the other end of the resistor R1, the other end of the capacitor C1, and pin 4 of the inductor L1 are all used to connect to the second output end of the AC power supply; the input end of the second anti-interference unit is connected to pins 2 and 3 of the inductor L1; the output end of the second anti-interference unit is connected to the input end of the rectifier module, the input end of the voltage module, the input end of the output module, and the input end of the regulation module.
[0009] A further solution is: the second anti-interference unit includes capacitor C2, capacitor C3, capacitor C4, capacitor C5, inductor L2 and thermistor NTC1; one end of the capacitor C2 and pin 4 of the inductor L2 are connected to pin 3 of the inductor L1; the other end of the capacitor C2 and pin 1 of the inductor L2 are connected to pin 2 of the inductor L1; pin 3 of the inductor L2 is connected to the input end of the rectifier module, the input end of the voltage module, the input end of the output module, the input end of the regulation module, one end of the capacitor C3, and one end of the capacitor C4; pin 2 of the inductor L2 is connected to the other end of the capacitor C3, one end of the capacitor C5, and one end of the thermistor NTC1; the other end of the thermistor NTC1 is connected to the input end of the rectifier module; the other end of the capacitor C5 and the other end of the capacitor C4 are grounded.
[0010] A further solution is: the rectifier module includes a rectifier bridge BG1 and a varistor RY1; pin 1 of the rectifier bridge BG1 is connected to the other end of the thermistor NTC1; pin 2 of the rectifier bridge BG1 is connected to pin 3 of the inductor L2 and the input end of the output module; the positive pole of the rectifier bridge BG1 and one end of the varistor RY1 are connected to the input end of the output module; the negative pole of the rectifier bridge BG1 and the other end of the varistor RY1 are grounded.
[0011] A further solution is: the voltage module includes a filtering unit and a control unit; the filtering unit includes a resistor R3, a diode D23 and an electrolytic capacitor C46; one end of the resistor R3 is connected to pin 3 of the inductor L2; the other end of the resistor R3 is connected to the positive electrode of the diode D23; the negative electrode of the diode D23 is connected to the positive electrode of the electrolytic capacitor C46 and the input end of the control unit; the negative electrode of the electrolytic capacitor C46 is grounded; and the output end of the control unit is connected to the input end of the output module.
[0012] A further solution is: the control unit includes a power chip U6, a capacitor C47, an electrolytic capacitor C48, an electrolytic capacitor C49, a resistor R44, a resistor R45, a resistor R46, a diode D24, a diode D25 and an inductor L3; the power chip U6 is LNK304; pin 5 of the power chip U6 is connected to the negative electrode of the diode D23; pin 1 of the power chip U6, pin 2 of the power chip U6, pin 7 of the power chip U6, pin 8 of the power chip U6, one end of the capacitor C47, one end of the resistor R45, the negative electrode of the diode D24, the negative electrode of the electrolytic capacitor C48 The pins 3 and 4 of the power supply chip U6 are connected to one end of the inductor L3; pin 3 of the power supply chip U6 is connected to the other end of the capacitor C47; pin 4 of the power supply chip U6 is connected to the other end of the resistor R45 and one end of the resistor R44; the other end of the resistor R44 is connected to the positive electrode of the electrolytic capacitor C48 and the negative electrode of the diode D25; the other end of the inductor L3 is connected to the positive electrode of the diode D25, one end of the resistor R46, the positive electrode of the electrolytic capacitor C49, and the input end of the output module; the positive electrode of the diode D24, the other end of the resistor R46, and the negative electrode of the electrolytic capacitor C49 are all grounded.
[0013] A further solution is: the output module includes a relay JD1, a resistor R2, a resistor R11, a resistor R12, an electrolytic capacitor C9 and an electrolytic capacitor C10; one end of the resistor R2 is connected to the other end of the inductor L3; the positive pole of the coil of the relay JD1 is connected to the other end of the resistor R2; the negative pole of the coil of the relay JD1 is connected to the output end of the adjustment module; the moving contact of the relay JD1 is connected to the other end of the resistor R2 and the output end of the adjustment module; the static contact of the relay JD1 is connected to one end of the resistor R11, one end of the resistor R12, the negative pole of the electrolytic capacitor C9, and the positive pole of the electrolytic capacitor C10; the other end of the resistor R11 and the positive pole of the electrolytic capacitor C9 are both connected to the positive pole of the rectifier bridge BG1; the other end of the resistor R12 and the negative pole of the electrolytic capacitor C10 are both grounded.
[0014] A further solution is: the adjustment module includes a first adjustment unit and a second adjustment unit; the first adjustment unit includes a diode D2, an electrolytic capacitor C6, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a Zener diode ZD2 and a transistor Q1; the positive electrode of the diode D2 is connected to the other end of the resistor R3; the negative electrode of the diode D2 is connected to one end of the resistor R5, one end of the resistor R7, and the positive electrode of the electrolytic capacitor C6; the other end of the resistor R7 is connected to the collector of the transistor Q1 and the input end of the second adjustment unit; the emitter of the transistor Q1, one end of the resistor R8, one end of the resistor R6, and the negative electrode of the electrolytic capacitor C6 are all grounded; the base of the transistor Q1 is connected to the other end of the resistor R8 and the positive electrode of the Zener diode ZD2; the negative electrode of the Zener diode ZD2 is connected to the other end of the resistor R5 and the other end of the resistor R6.
[0015] A further solution is: the second adjustment unit includes a resistor R9, a resistor R10, an electrolytic capacitor C8, a Zener diode ZD3, a transistor Q2, a transistor Q3 and a diode D3; one end of the resistor R9, the positive electrode of the electrolytic capacitor C8, and the negative electrode of the Zener diode ZD3 are all connected to the other end of the resistor R7; the positive electrode of the Zener diode ZD3 is connected to one end of the resistor R10 and the base of the transistor Q2; the emitter of the transistor Q2 is connected to the base of the transistor Q3; the collector of the transistor Q2, the collector of the transistor Q3, and the positive electrode of the diode D3 are all connected to the negative electrode of the coil of the relay JD1; the negative electrode of the diode D3 is connected to the positive electrode of the coil of the relay JD1; the emitter of the transistor Q3, the other end of the resistor R10, the negative electrode of the electrolytic capacitor C8, and the other end of the resistor R9 are all grounded.
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] The purpose of automatically adjusting the input AC power of different nominal voltages is achieved to facilitate the power supply of AC power equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is an electrical block diagram of an AC voltage automatic conversion circuit in this embodiment;
[0019] Figure 2 4 is a topological diagram of an AC voltage automatic conversion circuit in this embodiment.
[0020] Markings and corresponding parts names in the accompanying drawings:
[0021] 100-anti-interference module; 200-rectifier module; 300-voltage module; 400-regulation module; 500-output module. DETAILED DESCRIPTION
[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] Example
[0024] This embodiment provides an AC voltage automatic conversion circuit, such as Figure 1 As shown, it includes an anti-interference module 100, a rectifier module 200, a voltage module 300, a regulation module 400 and an output module 500, the input end of the anti-interference module 100 is used to access an AC power supply; the input end of the rectifier module 200 is connected to the output end of the anti-interference module 100; the input end of the voltage module 300 is connected to the output end of the anti-interference module 100; the input end of the regulation module 400 is connected to the output end of the anti-interference module 100; the input end of the output module 500 is connected to the output end of the rectifier module 200, the output end of the regulation module 400, the output end of the anti-interference module 100, and the output end of the voltage module 300.
[0025] In this embodiment, if Figure 2 As shown, the anti-interference module 100 includes a first anti-interference unit and a second anti-interference unit; the first anti-interference unit includes a resistor R1, a capacitor C1 and an inductor L1; one end of the resistor R1, one end of the capacitor C1, and pin 1 of the inductor L1 are all used to connect to the first output end of the AC power supply; the other end of the resistor R1, the other end of the capacitor C1, and pin 4 of the inductor L1 are all used to connect to the second output end of the AC power supply; the input end of the second anti-interference unit is connected to pins 2 and 3 of the inductor L1; the output end of the second anti-interference unit is connected to the input end of the rectifier module 200, the input end of the voltage module 300, the input end of the output module 500, and the input end of the regulation module 400.
[0026] In this embodiment, if Figure 2As shown, the second anti-interference unit includes capacitor C2, capacitor C3, capacitor C4, capacitor C5, inductor L2 and thermistor NTC1; one end of the capacitor C2 and pin 4 of the inductor L2 are connected to pin 3 of the inductor L1; the other end of the capacitor C2 and pin 1 of the inductor L2 are connected to pin 2 of the inductor L1; pin 3 of the inductor L2 is connected to the input end of the rectifier module 200, the input end of the voltage module 300, the input end of the output module 500, the input end of the adjustment module 400, one end of the capacitor C3, and one end of the capacitor C4; pin 2 of the inductor L2 is connected to the other end of the capacitor C3, one end of the capacitor C5, and one end of the thermistor NTC1; the other end of the thermistor NTC1 is connected to the input end of the rectifier module 200; the other end of the capacitor C5 and the other end of the capacitor C4 are grounded.
[0027] In this embodiment, if Figure 2 As shown, the rectifier module 200 includes a rectifier bridge BG1 and a varistor RY1; pin 1 of the rectifier bridge BG1 is connected to the other end of the thermistor NTC1; pin 2 of the rectifier bridge BG1 is connected to pin 3 of the inductor L2 and the input end of the output module 500; the positive pole of the rectifier bridge BG1 and one end of the varistor RY1 are connected to the input end of the output module 500; the negative pole of the rectifier bridge BG1 and the other end of the varistor RY1 are grounded.
[0028] In this embodiment, if Figure 2 As shown, the voltage module 300 includes a filtering unit and a control unit; the filtering unit includes a resistor R3, a diode D23 and an electrolytic capacitor C46; one end of the resistor R3 is connected to pin 3 of the inductor L2; the other end of the resistor R3 is connected to the positive electrode of the diode D23; the negative electrode of the diode D23 is connected to the positive electrode of the electrolytic capacitor C46 and the input end of the control unit; the negative electrode of the electrolytic capacitor C46 is grounded; the output end of the control unit is connected to the input end of the output module 500.
[0029] In this embodiment, if Figure 2As shown, the control unit includes a power chip U6, a capacitor C47, an electrolytic capacitor C48, an electrolytic capacitor C49, a resistor R44, a resistor R45, a resistor R46, a diode D24, a diode D25 and an inductor L3; the power chip U6 is LNK304; pin 5 of the power chip U6 is connected to the negative electrode of the diode D23; pin 1 of the power chip U6, pin 2 of the power chip U6, pin 7 of the power chip U6, pin 8 of the power chip U6, one end of the capacitor C47, one end of the resistor R45, the negative electrode of the diode D24, and the negative electrode of the electrolytic capacitor C48 are all connected to the One end of the inductor L3 is connected; pin 3 of the power chip U6 is connected to the other end of the capacitor C47; pin 4 of the power chip U6 is connected to the other end of the resistor R45 and one end of the resistor R44; the other end of the resistor R44 is connected to the positive electrode of the electrolytic capacitor C48 and the negative electrode of the diode D25; the other end of the inductor L3 is connected to the positive electrode of the diode D25, one end of the resistor R46, the positive electrode of the electrolytic capacitor C49, and the input end of the output module 500; the positive electrode of the diode D24, the other end of the resistor R46, and the negative electrode of the electrolytic capacitor C49 are all grounded.
[0030] In this embodiment, if Figure 2 As shown, the output module 500 includes a relay JD1, a resistor R2, a resistor R11, a resistor R12, an electrolytic capacitor C9 and an electrolytic capacitor C10; one end of the resistor R2 is connected to the other end of the inductor L3; the positive pole of the coil of the relay JD1 is connected to the other end of the resistor R2; the negative pole of the coil of the relay JD1 is connected to the output end of the adjustment module 400; the moving contact of the relay JD1 is connected to the other end of the resistor R2 and the output end of the adjustment module 400; the static contact of the relay JD1 is connected to one end of the resistor R11, one end of the resistor R12, the negative pole of the electrolytic capacitor C9, and the positive pole of the electrolytic capacitor C10; the other end of the resistor R11 and the positive pole of the electrolytic capacitor C9 are connected to the positive pole of the rectifier bridge BG1; the other end of the resistor R12 and the negative pole of the electrolytic capacitor C10 are grounded.
[0031] In this embodiment, if Figure 2As shown, the adjustment module 400 includes a first adjustment unit and a second adjustment unit; the first adjustment unit includes a diode D2, an electrolytic capacitor C6, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a Zener diode ZD2 and a transistor Q1; the positive electrode of the diode D2 is connected to the other end of the resistor R3; the negative electrode of the diode D2 is connected to one end of the resistor R5, one end of the resistor R7 and the positive electrode of the electrolytic capacitor C6; the other end of the resistor R7 is connected to the collector of the transistor Q1 and the input end of the second adjustment unit; the emitter of the transistor Q1, one end of the resistor R8, one end of the resistor R6 and the negative electrode of the electrolytic capacitor C6 are all grounded; the base of the transistor Q1 is connected to the other end of the resistor R8 and the positive electrode of the Zener diode ZD2; the negative electrode of the Zener diode ZD2 is connected to the other end of the resistor R5 and the other end of the resistor R6.
[0032] In this embodiment, if Figure 2 As shown, the second adjustment unit includes a resistor R9, a resistor R10, an electrolytic capacitor C8, a Zener diode ZD3, a transistor Q2, a transistor Q3 and a diode D3; one end of the resistor R9, the positive electrode of the electrolytic capacitor C8, and the negative electrode of the Zener diode ZD3 are all connected to the other end of the resistor R7; the positive electrode of the Zener diode ZD3 is connected to one end of the resistor R10 and the base of the transistor Q2; the emitter of the transistor Q2 is connected to the base of the transistor Q3; the collector of the transistor Q2, the collector of the transistor Q3, and the positive electrode of the diode D3 are all connected to the negative electrode of the coil of the relay JD1; the negative electrode of the diode D3 is connected to the positive electrode of the coil of the relay JD1; the emitter of the transistor Q3, the other end of the resistor R10, the negative electrode of the electrolytic capacitor C8, and the other end of the resistor R9 are all grounded.
[0033] Among them, one end of the resistor R1, one end of the capacitor C1, and pin 1 of the inductor L1 are commonly connected to the terminal CP1, which is used as the access port for the first output end of the AC power supply; the other end of the resistor R1, the other end of the capacitor C1, and pin 4 of the inductor L1 are commonly connected to the terminal CP2, which is used as the access port for the second output end of the AC power supply.
[0034] Resistor R1, capacitor C1, inductor L1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, inductor L2, and thermistor NTC1 together form the anti-interference module 100, also known as the EMC module, which is used for AC interference prevention and certification. The AC power flowing through the anti-interference module 100 is rectified into DC power when it passes through the rectifier bridge BG1. Resistor R3 is an auxiliary current-limiting resistor. After passing through resistor R3, the AC power flowing through the anti-interference module 100 is rectified by diode D23 and filtered by C46 to become high-voltage DC power.
[0035] The control unit composed of power chip U6, capacitor C47, electrolytic capacitor C48, electrolytic capacitor C49, resistor R44, resistor R45, resistor R46, diode D24, diode D25 and inductor L3 converts the high-voltage AC power rectified by diode D23 into stable 13V DC power, and uses the 13V DC power to power relay JD1 and control circuit.
[0036] The operating voltage of relay JD1 is 12V, while the power supply voltage of relay JD1 is 13V DC, which is higher than the operating voltage of relay JD1. Therefore, resistor R2 is connected in series to relay JD1.
[0037] Diode D2 is used for discharge, thereby effectively reducing the risk of high back electromotive force generated by the internal coil of relay JD1 when it is shut down, thereby damaging the components.
[0038] Capacitor C8 is used for circuit balance.
[0039] For example, when the AC power is 220V, diode D2 and electrolytic capacitor C6 rectify and filter the voltage AC220V x 1.4 = 308V. The voltage divided by resistors R5 and R6 is higher than the operating voltage of Zener diode ZD2. At this point, Zener diode ZD2 is conducting, transistor Q1 is conducting, the voltage divider between resistors R7 and R9 is at a low level, Zener diode ZD3 is not conducting, transistors Q2 and Q3 are disconnected, relay JD1 is disconnected, and electrolytic capacitors C9 and C10 are connected in series. This results in the DC voltage AC220V x 1.4 = 308V rectified by rectifier bridge BG1 being directly applied to electrolytic capacitors C9 and C10. In other words, the voltage across electrolytic capacitors C9 and C10 is both 154V, for a total voltage of 308V.
[0040] When the AC power supply is 110V, diode D2 and electrolytic capacitor C6 rectify and filter the voltage (AC110V x 1.4 = 154V). The voltage divided by resistors R5 and R6 is lower than the operating voltage of Zener diode ZD2. At this point, Zener diode ZD2 is off, transistor Q1 is off, the voltage divider between resistors R7 and R9 is high, Zener diode ZD3 is on, transistors Q2 and Q3 are on, relay JD1 is in the on state, and electrolytic capacitors C9 and C10 are connected in series. The rectified DC voltage (AC110V x 1.4 = 154V) from rectifier bridge BG1 is applied to electrolytic capacitor C9 and electrolytic capacitor C10, respectively. In other words, the voltage across electrolytic capacitors C9 and C10 is both 154V, for a total voltage of 308V.
[0041] In actual use, the threshold value can be set to around 140V. When the AC current exceeds the threshold value, the default AC current is 220V, and the relay does not operate. When the AC current falls below the threshold value, relay JD1 operates to convert the voltage. This automatically adjusts the input AC current to different nominal voltages, facilitating power supply to AC devices.
[0042] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or arrangement of the subject combination arrangement. In addition to variations and modifications to the components and / or arrangement, other uses will also be apparent to those skilled in the art.
Claims
1. An AC voltage automatic conversion circuit, characterized in that: include: An anti-interference module (100), wherein an input end of the anti-interference module (100) is used to connect to an AC power supply; a rectifier module (200), wherein an input end of the rectifier module (200) is connected to an output end of the anti-interference module (100); a voltage module (300), wherein an input end of the voltage module (300) is connected to an output end of the anti-interference module (100); an adjustment module (400), wherein an input end of the adjustment module (400) is connected to an output end of the anti-interference module (100); An output module (500), wherein the input end of the output module (500) is connected to the output end of the rectifier module (200), the output end of the adjustment module (400), the output end of the anti-interference module (100), and the output end of the voltage module (300).
2. The AC voltage automatic conversion circuit according to claim 1, characterized in that: The anti-interference module (100) comprises a first anti-interference unit and a second anti-interference unit; The first anti-interference unit includes a resistor R1, a capacitor C1 and an inductor L1; One end of the resistor R1, one end of the capacitor C1, and pin 1 of the inductor L1 are all used to connect to the first output terminal of the AC power supply; The other end of the resistor R1, the other end of the capacitor C1, and pin 4 of the inductor L1 are all used to connect to the second output terminal of the AC power supply; The input end of the second anti-interference unit is connected to both pins 2 and 3 of the inductor L1; The output end of the second anti-interference unit is connected to the input end of the rectifier module (200), the input end of the voltage module (300), the input end of the output module (500), and the input end of the regulating module (400).
3. The AC voltage automatic conversion circuit according to claim 2, characterized in that: The second anti-interference unit includes a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, an inductor L2 and a thermistor NTC1; One end of the capacitor C2 and pin 4 of the inductor L2 are connected to pin 3 of the inductor L1; The other end of the capacitor C2 and pin 1 of the inductor L2 are connected to pin 2 of the inductor L1; Pin 3 of the inductor L2 is connected to the input end of the rectifier module (200), the input end of the voltage module (300), the input end of the output module (500), the input end of the adjustment module (400), one end of the capacitor C3, and one end of the capacitor C4; Pin 2 of the inductor L2 is connected to the other end of the capacitor C3, one end of the capacitor C5, and one end of the thermistor NTC1; The other end of the thermistor NTC1 is connected to the input end of the rectifier module (200); The other end of the capacitor C5 and the other end of the capacitor C4 are both grounded.
4. The AC voltage automatic conversion circuit according to claim 3, characterized in that: The rectifier module (200) comprises a rectifier bridge BG1 and a varistor RY1; Pin 1 of the rectifier bridge BG1 is connected to the other end of the thermistor NTC1; Pin 2 of the rectifier bridge BG1 is connected to pin 3 of the inductor L2 and the input end of the output module (500); The positive electrode of the rectifier bridge BG1 and one end of the varistor RY1 are both connected to the input end of the output module (500); The negative electrode of the rectifier bridge BG1 and the other end of the varistor RY1 are both grounded.
5. The AC voltage automatic conversion circuit according to claim 4, characterized in that: The voltage module (300) includes a filtering unit and a control unit; The filtering unit includes a resistor R3, a diode D23 and an electrolytic capacitor C46; One end of the resistor R3 is connected to pin 3 of the inductor L2; The other end of the resistor R3 is connected to the anode of the diode D23; The cathode of the diode D23 is connected to the anode of the electrolytic capacitor C46 and the input terminal of the control unit; The negative electrode of the electrolytic capacitor C46 is grounded; The output end of the control unit is connected to the input end of the output module (500).
6. The AC voltage automatic conversion circuit according to claim 5, characterized in that: The control unit includes a power chip U6, a capacitor C47, an electrolytic capacitor C48, an electrolytic capacitor C49, a resistor R44, a resistor R45, a resistor R46, a diode D24, a diode D25 and an inductor L3; The power chip U6 is LNK304; Pin 5 of the power chip U6 is connected to the cathode of the diode D23; Pin 1 of the power chip U6, pin 2 of the power chip U6, pin 7 of the power chip U6, pin 8 of the power chip U6, one end of the capacitor C47, one end of the resistor R45, the cathode of the diode D24, and the cathode of the electrolytic capacitor C48 are all connected to one end of the inductor L3; Pin 3 of the power chip U6 is connected to the other end of the capacitor C47; Pin 4 of the power chip U6 is connected to the other end of the resistor R45 and one end of the resistor R44; The other end of the resistor R44 is connected to the positive electrode of the electrolytic capacitor C48 and the negative electrode of the diode D25; The other end of the inductor L3 is connected to the positive electrode of the diode D25, one end of the resistor R46, the positive electrode of the electrolytic capacitor C49, and the input end of the output module (500); The anode of the diode D24, the other end of the resistor R46, and the cathode of the electrolytic capacitor C49 are all grounded.
7. The AC voltage automatic conversion circuit according to claim 6, characterized in that: The output module (500) includes a relay JD1, a resistor R2, a resistor R11, a resistor R12, an electrolytic capacitor C9, and an electrolytic capacitor C10; One end of the resistor R2 is connected to the other end of the inductor L3; The positive pole of the coil of the relay JD1 is connected to the other end of the resistor R2; The negative pole of the coil of the relay JD1 is connected to the output end of the regulating module (400); The movable contact of the relay JD1 is connected to the other end of the resistor R2 and the output end of the regulating module (400); The static contact of the relay JD1 is connected to one end of the resistor R11, one end of the resistor R12, the negative electrode of the electrolytic capacitor C9, and the positive electrode of the electrolytic capacitor C10; The other end of the resistor R11 and the positive electrode of the electrolytic capacitor C9 are connected to the positive electrode of the rectifier bridge BG1; The other end of the resistor R12 and the negative electrode of the electrolytic capacitor C10 are both grounded.
8. The AC voltage automatic conversion circuit according to claim 7, characterized in that: The regulating module (400) comprises a first regulating unit and a second regulating unit; The first regulating unit includes a diode D2, an electrolytic capacitor C6, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a voltage stabilizing diode ZD2 and a transistor Q1; The anode of the diode D2 is connected to the other end of the resistor R3; The cathode of the diode D2 is connected to one end of the resistor R5, one end of the resistor R7, and the positive electrode of the electrolytic capacitor C6; The other end of the resistor R7 is connected to the collector of the transistor Q1 and the input end of the second regulating unit; The emitter of the transistor Q1, one end of the resistor R8, one end of the resistor R6, and the negative electrode of the electrolytic capacitor C6 are all grounded; The base of the transistor Q1 is connected to the other end of the resistor R8 and the positive electrode of the voltage stabilizing diode ZD2; The cathode of the voltage stabilizing diode ZD2 is connected to the other end of the resistor R5 and the other end of the resistor R6.
9. The AC voltage automatic conversion circuit according to claim 8, characterized in that: The second adjustment unit includes a resistor R9, a resistor R10, an electrolytic capacitor C8, a voltage stabilizing diode ZD3, a transistor Q2, a transistor Q3 and a diode D3; One end of the resistor R9, the positive electrode of the electrolytic capacitor C8, and the negative electrode of the voltage stabilizing diode ZD3 are all connected to the other end of the resistor R7; The positive electrode of the voltage stabilizing diode ZD3 is connected to one end of the resistor R10 and the base of the transistor Q2; The emitter of the transistor Q2 is connected to the base of the transistor Q3; The collector of the transistor Q2, the collector of the transistor Q3, and the anode of the diode D3 are all connected to the negative electrode of the coil of the relay JD1; The cathode of the diode D3 is connected to the anode of the coil of the relay JD1; The emitter of the transistor Q3, the other end of the resistor R10, the negative electrode of the electrolytic capacitor C8, and the other end of the resistor R9 are all grounded.