AC-TO-AC correction wave converter

Abstract

The utility model discloses an AC-TO-AC correction wave converter, which comprises an AC input module 1, a rectification filter circuit 2, a BUCK step-down circuit 3, a sine wave correction inverter bridge circuit 4, an inverter bridge control circuit 5, an AC output module 6 and a USB charging control circuit 7, the sine wave correction inverter bridge circuit 4 comprises an MOS tube M2, an MOS tube M3, an MOS tube M4, an MOS tube M5, an input voltage monitoring module 41, an output current detection module 42, a first driving module 43 connected with the MOS tube M2 and the inverter bridge control circuit 5, and a second driving module 44 connected with the MOS tube M3 and the inverter bridge control circuit 5. The third driving module 45 is connected with the MOS tube M4 and the inverter bridge control circuit 5; the fourth driving module 46 is connected with the MOS tube M5 and the inverter bridge control circuit 5; and an AC power supply circuit 8 is arranged between the inverter bridge control circuit 5 and the USB charging control circuit 7.

Description

Technical fields:

[0001] This utility model relates to the field of socket converter technology, and specifically to an AC to AC corrected wave converter. Background technology:

[0002] With globalization and the increasing popularity of international travel, more and more people are crossing borders for business, tourism, or work. However, the sockets and voltage standards used in different countries vary, causing inconvenience when using electronic devices. Common socket types on the market include Type A (US standard), Type C (European standard), Type G (British standard), and Type I (Australian standard), while voltages are typically either 110V or 220V. When using electronic devices in different countries, incompatible plugs or voltage mismatches can not only prevent the devices from charging or functioning properly, but may even lead to equipment damage or safety accidents.

[0003] A multi-country plug adapter is a portable power adaptation device designed to solve the problem of inconsistent plug standards. With multiple built-in plug and socket ports, the adapter can adapt to various types of socket interfaces and features voltage conversion, converting local voltage to the standard voltage required by your devices. This allows electronic devices to be connected to power sources in different countries smoothly, protecting their safety. Existing multi-country plug adapters are typically compact, portable, and multifunctional, making them suitable for international travelers, business travelers, and companies managing global supply chains. Furthermore, with technological advancements, some adapters have added USB ports and fast charging capabilities, further enhancing ease of use and device compatibility.

[0004] For example, Chinese utility model patent CN204966896 U discloses a multi-country plug adapter, including an adapter base with a plug distribution surface. The adapter base contains a socket and a retractable plug. The retractable plug can extend out of the adapter base or retract into the adapter base from the plug distribution surface. The retractable plug includes a British standard plug with a ground pin, an American standard plug with a ground pin, or an Australian standard plug with a ground pin. The American or Australian standard plug is positioned between the ground and IN pins of the British standard plug. This design significantly reduces the space occupied by the multi-country plug adapter's installation distribution structure, resulting in a more rational and compact structure. The more efficient use of the multi-country plug pin distribution structure reduces the overall size, making the multi-country plug smaller and more convenient to use and carry.

[0005] In view of the above, the inventors propose the following technical solution. Utility model content:

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an AC to AC corrected wave converter.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an AC to AC modified wave converter, comprising: an AC input module, a rectifier filter circuit, a BUCK step-down circuit, a modified sine wave inverter bridge circuit, an inverter bridge control circuit, an AC output module, and a USB charging control circuit. The modified sine wave inverter bridge circuit includes MOSFETs M2, M3, M4, and M5, an input voltage monitoring module, an output current detection module, a first drive module connecting MOSFET M2 to the inverter bridge control circuit, a second drive module connecting MOSFET M3 to the inverter bridge control circuit, a third drive module connecting MOSFET M4 to the inverter bridge control circuit, and a fourth drive module connecting MOSFET M5 to the inverter bridge control circuit. An AC power supply circuit is provided between the inverter bridge control circuit and the USB charging control circuit.

[0008] Furthermore, in the above technical solution, the first driving module includes resistors R10 and R11 connected in series between the gate of MOSFET M2 and the H01 pin of the inverter bridge control circuit, diode D2 connected in parallel with resistor R10, and resistor R14 connected between the gate of MOSFET M2 and the source of MOSFET M2. The second, third, and fourth driving modules are the same as the first driving module. The source of MOSFET M2 and the drain of MOSFET M4 are connected and connected to the N-OUT pin of the AC output module. The source of MOSFET M3 and the drain of MOSFET M5 are connected and connected to the L-OUT pin of the AC output module.

[0009] Furthermore, in the above technical solution, the input voltage monitoring module includes resistors R1, R4, and R5 connected in series between the VBUS pin and the BUCK buck circuit in the inverter bridge control circuit; capacitor C8 connected between the VBUS pin and resistor R1 in the inverter bridge control circuit and connected to the GND terminal; capacitor C9 and resistor R16 connected between resistors R1 and R4 and connected to the GND terminal; and capacitor C46 connected between resistor R1 and the modified sine wave inverter bridge circuit and connected to the GND terminal. The output current detection module includes resistors R31, R32, and R33 connected in parallel between the source terminal of MOSFET M4 and the source terminal of MOSFET M5.

[0010] Furthermore, in the above technical solution, the AC power supply circuit includes a MOSFET M8 and a chip U9 connected in series in the USB charging control circuit and the inverter bridge control circuit, capacitors C39 and C40 connected to the IN and OUT pins of the chip U9 respectively, and capacitors C41 and C42 connected to the D and S terminals of the MOSFET M8. The D terminal of the MOSFET M8 is connected to the VCC pin in the USB charging control circuit, the G terminal of the MOSFET M8 and capacitors C41 and C42 are both grounded, the S terminal of the MOSFET M8 and the IN pin of the chip U9 are connected to the +12V pin, and the GND pin of the chip U9 and capacitors C39 and C40 are both grounded.

[0011] Furthermore, in the above technical solution, the USB charging control circuit includes a fuse F3, a main control chip U6, a transformer TI, a power controller U3, a buck converter U4, a first USB unit, a second USB unit, a third USB unit, and a fourth USB unit. The fuse F3 is connected to the BUCK buck circuit, the AC power supply circuit is connected to the VCC pin of the power controller U3, and the first USB unit and the second USB unit are both TYPE-C output interfaces.

[0012] Furthermore, in the above technical solution, the inverter bridge control circuit includes a chip IC1, an output temperature detection module, and a fan control module. The input voltage monitoring module is connected to the VBUS pin and GND pin of the chip IC1, and the first drive module, the second drive module, the third drive module, and the fourth drive module are respectively connected to the H01 pin, H02 pin, LO1 pin, and LO2 pin of the chip IC1.

[0013] Furthermore, in the above technical solution, the output temperature detection module includes a capacitor C19, a resistor R35, a resistor R38, a resistor R78, and a diode LED1. One end of the capacitor C19, resistor R35, and resistor R38 is connected to the NTC pin of the chip IC1, the other end of resistor R35 is connected to the AC-5V pin, resistor R78 and diode LED1 are connected in series to the LED pin of the chip IC1, and the other end of the capacitor C19, resistor R38, and diode LED1 is grounded.

[0014] Furthermore, in the above technical solution, the fan control module includes resistor R44, resistor R46, optocoupler P1, resistor R47, resistor R48, MOSFET M7, and fan F2. Resistors R44 and R46 are connected in series on the FAN pin of chip IC1, one end of resistor R46 is grounded, and optocoupler P1A is connected in parallel with resistor R46. The drain of MOSFET and optocoupler P1A are respectively connected to the two ends of fan F2. Resistor R47 is connected between the gate of MOSFET and optocoupler P1A. Resistor R48 is connected to the gate of MOSFET M7 and grounded. The source of MOSFET M7 is grounded.

[0015] Furthermore, in the above technical solution, the BUCK step-down circuit includes a MOSFET M1, a fifth drive module, a current detection module, an energy storage filter module, a power control module, a power supply module, a freewheeling module, and an output voltage detection module. The MOSFET M1 is connected to the rectifier filter circuit, the energy storage filter module is connected to the modified sine wave inverter bridge circuit, and an optocoupler P3 is provided between the power control module and the output voltage detection module.

[0016] Furthermore, in the above technical solution, the current detection module includes resistors R34, R36 and R45 connected in parallel to the source terminal of MOSFET M1. The other ends of resistors R34 and R36 are connected to the freewheeling module and the energy storage filter module, and the other end of resistor R45 is connected to the power control module.

[0017] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: In the present invention, the BUCK step-down circuit 3 is used to reduce the DC voltage from 150V-375V to 120-150V. The DC voltage is converted into a modified sine wave AC output through the full-bridge circuit composed of MOSFETs M2, M3, M4, and M5. When MOSFETs M2 and M5 are turned on simultaneously, the DC voltage on the bus flows through MOSFET M2 to the output L terminal, and then flows from the N terminal to the DC ground of the bus through MOSFET M5, forming a positive half-cycle voltage from the L terminal to the N terminal. Similarly, when MOSFETs M3 and M4 are turned on simultaneously, the DC voltage on the bus flows through MOSFET M4 to the output N terminal, and then flows from the L terminal to the DC ground of the bus through MOSFET M3, forming a negative half-cycle voltage from the N terminal to the L terminal. Thus, the AC output of the AC output module is realized. Secondly, the AC power supply circuit draws power from the USB charging control circuit to supply power to the inverter bridge control circuit, eliminating the need for a separate power supply module to power the inverter bridge control circuit. Attached image description:

[0018] Figure 1 This is the circuit of this utility model. Figure 1 ;

[0019] Figure 2 This is the circuit of this utility model. Figure 2 ;

[0020] Figure 3 This is the circuit diagram of the BUCK step-down circuit in this utility model;

[0021] Figure 4 This is the circuit diagram of the modified sine wave inverter bridge circuit in this utility model;

[0022] Figure 5 This is a circuit diagram of the output temperature detection module in this utility model;

[0023] Figure 6 This is a circuit diagram of the fan control module in this utility model;

[0024] Figure 7 This is a circuit diagram of the AC power supply circuit in this utility model. Detailed implementation method:

[0025] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0026] See Figures 1 to 7As shown, an AC to AC modified wave converter includes: an AC input module 1, a rectifier and filter circuit 2, a BUCK step-down circuit 3, a modified sine wave inverter bridge circuit 4, an inverter bridge control circuit 5, an AC output module 6, and a USB charging control circuit 7. The modified sine wave inverter bridge circuit 4 includes MOSFETs M2, M3, M4, and M5, an input voltage monitoring module 41, an output current detection module 42, a first drive module 43 connecting MOSFET M2 to the inverter bridge control circuit 5, a second drive module 44 connecting MOSFET M3 to the inverter bridge control circuit 5, a third drive module 45 connecting MOSFET M4 to the inverter bridge control circuit 5, and a fourth drive module 46 connecting MOSFET M5 to the inverter bridge control circuit 5. An AC power supply circuit 8 is located between the inverter bridge control circuit 5 and the USB charging control circuit 7. A buck converter 3 reduces the DC voltage from 150V-375V to 120-150V. A full-bridge circuit composed of MOSFETs M2, M3, M4, and M5 converts this DC voltage into a modified sinusoidal AC output. When MOSFETs M2 and M5 are simultaneously turned on, the DC voltage on the bus flows through MOSFET M2 to the output terminal (L), then from the N terminal (N) through MOSFET M5 to the bus ground, forming a positive half-cycle voltage from L to N. Similarly, when MOSFETs M3 and M4 are simultaneously turned on, the DC voltage on the bus flows through MOSFET M4 to the output terminal (N), then from the L terminal (L) through MOSFET M3 back to the bus ground, forming a negative half-cycle voltage from N to L. This enables the AC output module 6 to output AC. Furthermore, the AC power supply circuit 8 draws power from the USB charging control circuit 7 to supply power to the inverter bridge control circuit 5, eliminating the need for a separate power supply module for the inverter bridge control circuit 5.

[0027] The first driving module 43 includes resistors R10 and R11 connected in series between the gate of MOSFET M2 and the H01 pin of the inverter bridge control circuit 5, diode D2 connected in parallel with resistor R10, and resistor R14 connected between the gate of MOSFET M2 and the source of MOSFET M2. The second driving module 44, the third driving module 45, and the fourth driving module 46 are the same as the first driving module 43. The source of MOSFET M2 and the drain of MOSFET 4 are connected and connected to the N-OUT pin of AC output module 6. The source of MOSFET M3 and the drain of MOSFET M5 are connected and connected to the L-OUT pin of AC output module 6.

[0028] The input voltage monitoring module 41 includes resistors R1, R4, and R5 connected in series between the VBUS pin of the inverter bridge control circuit 5 and the BUCK buck circuit 3; capacitor C8 connected between the VBUS pin of the inverter bridge control circuit 5 and resistor R1 and connected to the GND terminal; capacitor C9 connected between resistors R1 and R4 and connected to the GND terminal; and capacitor C46 connected between resistor R1 and the modified sine wave inverter bridge circuit 4 and connected to the GND terminal. The output current detection module 42 includes resistors R31, R32, and R33 connected in parallel between the source terminals of MOSFET M4 and MOSFET M5. The input voltage monitoring module 41 detects the input voltage and adjusts the duty cycle.

[0029] The AC power supply circuit 8 includes a MOSFET M8 and a chip U9 connected in series with the USB charging control circuit 7 and the inverter bridge control circuit 5, capacitors C39 and C40 connected to the IN and OUT pins of the chip U9 respectively, and capacitors C41 and C42 connected to the D and S terminals of the MOSFET M8. The D terminal of the MOSFET M8 is connected to the VCC pin of the USB charging control circuit 7, the G terminal of the MOSFET M8 and capacitors C41 and C42 are both grounded, the S terminal of the MOSFET M8 and the IN pin of the chip U9 are connected to the +12V pin, and the GND pin of the chip U9 and capacitors C39 and C40 are both grounded.

[0030] The USB charging control circuit 7 includes a fuse F3, a main control chip U6, a transformer TI, a power controller U3, a step-down converter U4, a first USB unit 71, a second USB unit 72, a third USB unit 73, and a fourth USB unit 74. The fuse F3 is connected to the BUCK step-down circuit 3, the AC power supply circuit 8 is connected to the VCC pin of the power controller U3, and the first USB unit 71 and the second USB unit 72 are both TYPE-C output interfaces.

[0031] The inverter bridge control circuit 5 includes a chip IC1, an output temperature detection module 51, and a fan control module 52. The input voltage monitoring module 41 is connected to the VBUS pin and GND pin of the chip IC1. The first drive module 43, the second drive module 44, the third drive module 45, and the fourth drive module 46 are respectively connected to the H01 pin, H02 pin, LO1 pin, and LO2 pin of the chip IC1.

[0032] The output temperature detection module 51 includes a capacitor C19, a resistor R35, a resistor R38, a resistor R78, and a diode LED1. One end of the capacitor C19, resistor R35, and resistor R38 is connected to the NTC pin of the chip IC1, the other end of resistor R35 is connected to the AC-5V pin, resistor R78 and diode LED1 are connected in series to the LED pin of the chip IC1, and the other end of the capacitor C19, resistor R38, and diode LED1 is grounded.

[0033] The fan control module 52 includes resistors R44 and R46, optocoupler P1, resistors R47 and R48, MOSFET M7, and fan F2. Resistors R44 and R46 are connected in series to the FAN pin of chip IC1, one end of resistor R46 is grounded, and optocoupler P1A is connected in parallel to resistor R46. The drain of MOSFET and optocoupler P1A are respectively connected to the two ends of fan F2. Resistor R47 is connected between the gate of MOSFET and optocoupler P1A. Resistor R48 is connected to the gate of MOSFET M7 and grounded. The source of MOSFET M7 is grounded.

[0034] The BUCK step-down circuit 3 includes a MOSFET M1, a fifth drive module 31, a current detection module 32, an energy storage filter module 33, a power control module 34, a power supply module 35, a freewheeling module 36, and an output voltage detection module 37. The MOSFET M1 is connected to the rectifier filter circuit 2, the energy storage filter module 33 is connected to the modified sine wave inverter bridge circuit 4, and an optocoupler P3 is provided between the power control module 34 and the output voltage detection module 37.

[0035] The current detection module 32 includes resistors R34, R36, and R45 connected in parallel to the source (S) terminal of the MOSFET M1. The other ends of resistors R34 and R36 are connected to the freewheeling module 36 and the energy storage filter module 33, respectively, while the other end of resistor R45 is connected to the power control module 34. The freewheeling module 36 includes diodes D7 and D13 connected in parallel. One end of diodes D7 and D13 is connected to the other end of resistors R34 and R36, while the other ends of diodes D7 and D13 are grounded.

[0036] The power control module 34 includes a PWM control chip U1, and a resistor R45 is connected to the CS pin of the PWM control chip U1. The fifth drive module 31 includes a diode D1 and resistors R7 and R76 connected in parallel to the gate of the MOSFET M1. The other end of the resistor R76 is connected to the source of the MOSFET M1, and the other ends of the diode D1 and resistor R7 are connected to the gate pin of the PWM control chip U1 through a series resistor R6.

[0037] The energy storage and filtering module 33 includes an inductor L1, a resistor R20, a capacitor C14, and a capacitor C17. Pins 3 and 4 of inductor L1 are connected to the current detection module 32. Resistor R20 is connected between pin 1 of inductor L1 and the power supply module 35. One end of capacitors C14 and C17 is connected in parallel to pin 2 of inductor L1, and the other ends of capacitors C14 and C17 are grounded. Pin 2 of inductor L1 is also connected to the output voltage detection module 37 and the corrected sine wave inverter bridge circuit 4. The power supply module 35 includes a diode D5 and a capacitor C13 connected in series. One end of diode D5 is connected to resistor R20 in the energy storage and filtering module 33, and the other end of diode D5 is connected to capacitor C13 and the VDD pin of the PWM control chip U1. The other end of capacitor C13 is connected to pin 3 of inductor L1.

[0038] In summary, the working principle of this utility model is as follows:

[0039] During operation, the municipal AC power is input after passing through the NTC surge protector fuse of AC input module 1, and after being rectified by DB1 bridge rectifier and filtered by capacitors C6 and C7, it becomes a smooth DC voltage.

[0040] Furthermore, the DC voltage is reduced from 130V~375V to 120~150V after passing through the BUCK step-down circuit 3, which consists of MOSFET M1, inductor L1, resistor R34, resistor R36, diode D7, diode D13 and capacitor C14.

[0041] Furthermore, the BUCK step-down circuit 3 sends the pulse voltage into the filter network composed of inductor L1 and capacitor C14 by controlling the switching time of MOSFET M1, and converts it into a low-voltage smooth DC current. Diodes D7 and D13 provide a freewheeling path for inductor L1, and resistors R34 and R36 are current sampling resistors.

[0042] Furthermore, a voltage feedback loop consisting of resistors R18, R25, and R30, optocoupler P3, and chip U2 is sent to chip U1 to adjust the voltage value on capacitor C14 and ensure the stability of the bus voltage.

[0043] Furthermore, inductor L1 consists of two mutual inductance windings. The main winding is used for energy storage and filtering, while the secondary winding provides power to the control chip U1. The rectifier and filter circuit composed of diode D5 and capacitor C13 provides the energy of the secondary winding of the inductor to power the control chip U1.

[0044] Furthermore, the full-bridge circuit composed of MOSFETs M2, M3, M4, and M6 converts DC power into a modified sinusoidal AC output. When MOSFETs M3 and M4 are simultaneously turned on, the DC voltage on the bus flows through MOSFET M3 to the output L terminal, and then from the N terminal through MOSFET M4 to the DC ground of the bus, forming a positive half-cycle voltage from L to N. When MOSFETs M2 and M6 are simultaneously turned on, the DC power on the bus flows through MOSFET M2 to the output N terminal, and then from the L terminal through MOSFET M6 back to the DC ground of the bus, forming a negative half-cycle voltage from N to L.

[0045] Furthermore, the AC output voltage value is controlled by controlling the turn-on time of MOSFETs M2, M3, M4, and M6;

[0046] Furthermore, resistors R31, R32, and R33 are current sampling resistors for the DC-to-AC inverter section, controlling the output current and providing overcurrent and short-circuit protection.

[0047] Furthermore, resistors R1, R4, R5, and R16 constitute the bus input voltage detection and output voltage regulation.

[0048] Furthermore, the chip IC1 integrates an MCU control circuit and a drive circuit, which drives the four MOSFETs to turn on and off through the resistors connected in series at the gate of MOSFETs M2, M3, M4 and M6.

[0049] Furthermore, a temperature detection circuit is formed by resistors R35 and R38. Resistor R38 is an NTC temperature detection resistor. The higher the temperature, the lower the resistance of the NTC and the lower the voltage sent to chip IC1. When the temperature reaches a certain level, chip IC1 outputs a high level to drive optocoupler P1 to turn on and turn on the cooling fan to dissipate heat from the circuit. When the temperature exceeds the limit, chip IC1 will turn off the output.

[0050] Furthermore, the MOSFET M8 draws power from the VCC terminal of the USB charging control IC U6, which is then converted to 5V by the chip U9 to power the control circuit and internal MCU of the chip IC1. The MOSFET M8 outputs 12V to power the internal drive circuit of the chip IC1.

[0051] Of course, the above description is only a specific embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model should be included in the scope of the claims of the present utility model.

Claims

1. An AC to AC corrected wave converter, characterized in that, include: The AC input module (1), rectifier filter circuit (2), BUCK step-down circuit (3), modified sine wave inverter bridge circuit (4), inverter bridge control circuit (5), AC output module (6) and USB charging control circuit (7) are provided. The modified sine wave inverter bridge circuit (4) includes MOSFETs M2, M3, M4, and M5, an input voltage monitoring module (41), an output current detection module (42), a first drive module (43) connecting MOSFET M2 and inverter bridge control circuit (5), a second drive module (44) connecting MOSFET M3 and inverter bridge control circuit (5), a third drive module (45) connecting MOSFET M4 and inverter bridge control circuit (5), and a fourth drive module (46) connecting MOSFET M5 and inverter bridge control circuit (5). The inverter bridge control circuit (5) and the USB charging control circuit (7) are located in the AC power supply circuit (8).

2. An AC to AC corrected wave converter according to claim 1, characterized in that: The first driving module (43) includes resistors R10 and R11 connected in series between the gate of MOSFET M2 and the H01 pin of the inverter bridge control circuit (5), diode D2 connected in parallel with resistor R10, and resistor R14 connected between the gate of MOSFET M2 and the source of MOSFET M2. The second driving module (44), the third driving module (45), and the fourth driving module (46) are the same as the first driving module (43). The source of MOSFET M2 is connected to the drain of MOSFET 4 and connected to the N-OUT pin of the AC output module (6). The source of MOSFET M3 and the drain of MOSFET M5 are connected to the L-OUT pin of the AC output module (6).

3. An AC to AC corrected wave converter according to claim 1, characterized in that: The input voltage monitoring module (41) includes resistors R1, R4, and R5 connected in series between the VBUS pin and the BUCK step-down circuit (3) in the inverter bridge control circuit (5), capacitor C8 connected between the VBUS pin and resistor R1 in the inverter bridge control circuit (5) and connected to the GND terminal, capacitor C9 connected between resistors R1 and R4 and connected to the GND terminal, and capacitor C46 connected between resistor R1 and the modified sine wave inverter bridge circuit (4) and connected to the GND terminal; the output current detection module (42) includes resistors R31, R32, and R33 connected in parallel between the source terminal of MOSFET M4 and the source terminal of MOSFET M5.

4. An AC to AC corrected wave converter according to claim 1, characterized in that: The AC power supply circuit (8) includes a MOS transistor M8 and a chip U9 connected in series with the USB charging control circuit (7) and the inverter bridge control circuit (5), capacitors C39 and C40 connected to the IN and OUT pins of the chip U9 respectively, and capacitors C41 and C42 connected to the D and S terminals of the MOS transistor M8. The D terminal of the MOS transistor M8 is connected to the VCC pin of the USB charging control circuit (7), the G terminal of the MOS transistor M8 and capacitors C41 and C42 are both grounded, the S terminal of the MOS transistor M8 and the IN pin of the chip U9 are connected to the +12V pin, and the GND pin of the chip U9 and capacitors C39 and C40 are both grounded.

5. An AC to AC corrected wave converter according to claim 1, characterized in that: The USB charging control circuit (7) includes a fuse F3, a main control chip U6, a transformer TI, a power controller U3, a step-down converter U4, a first USB unit (71), a second USB unit (72), a third USB unit (73), and a fourth USB unit (74). The fuse F3 is connected to the BUCK step-down circuit (3), and the AC power supply circuit (8) is connected to the VCC pin of the power controller U3. The first USB unit (71) and the second USB unit (72) are both TYPE-C output interfaces.

6. An AC to AC corrected wave converter according to claim 1, characterized in that: The inverter bridge control circuit (5) includes a chip IC1, an output temperature detection module (51), and a fan control module (52). The input voltage monitoring module (41) is connected to the VBUS pin and GND pin of the chip IC1. The first drive module (43), the second drive module (44), the third drive module (45), and the fourth drive module (46) are respectively connected to the H01 pin, H02 pin, LO1 pin, and LO2 pin of the chip IC1.

7. An AC to AC corrected wave converter according to claim 6, characterized in that: The output temperature detection module (51) includes a capacitor C19, a resistor R35, a resistor R38, a resistor R78, and a diode LED1. One end of the capacitor C19, resistor R35, and resistor R38 is connected to the NTC pin of the chip IC1, the other end of resistor R35 is connected to the AC-5V pin, resistor R78 and diode LED1 are connected in series to the LED pin of the chip IC1, and the other end of the capacitor C19, resistor R38, and diode LED1 is grounded.

8. An AC to AC corrected wave converter according to claim 6, characterized in that: The fan control module (52) includes resistors R44 and R46, optocoupler P1, resistors R47 and R48, MOSFET M7 and fan F2. Resistors R44 and R46 are connected in series to the FAN pin of chip IC1. One end of resistor R46 is grounded, and optocoupler PAB is connected in parallel to resistor R46. The drain of MOSFET and optocoupler P1A are connected to the two ends of fan F2 respectively. Resistor R47 is connected between the gate of MOSFET and optocoupler P1A. Resistor R48 is connected to the gate of MOSFET M7 and grounded. The source of MOSFET M7 is grounded.

9. An AC to AC corrected wave converter according to any one of claims 1-8, characterized in that: The BUCK step-down circuit (3) includes a MOSFET M1, a fifth drive module (31), a current detection module (32), an energy storage filter module (33), a power control module (34), a power supply module (35), a freewheeling module (36), and an output voltage detection module (37). The MOSFET M1 is connected to the rectifier filter circuit (2), the energy storage filter module (33) is connected to the modified sine wave inverter bridge circuit (4), and an optocoupler P3 is provided between the power control module (34) and the output voltage detection module (37).

10. An AC to AC corrected wave converter according to claim 9, characterized in that: The current detection module (32) includes resistors R34, R36 and R45 connected in parallel to the source of the MOSFET M1. The other ends of resistors R34 and R36 are connected to the freewheeling module (36) and the energy storage filter module (33), and the other end of resistor R45 is connected to the power control module (34).

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