CN206379887U - A kind of intelligent sine voltage change-over circuit based on metal-oxide-semiconductor full-bridge rectification - Google Patents

Abstract

The utility model discloses an intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification, which includes an AC input unit, a PFC boost unit, an inverter and phase-inverting unit, and a MOS tube full-bridge rectifier unit, including The first MOS tube, the second MOS tube, the third MOS tube, the fourth MOS tube and the first capacitor, the first MOS tube and the fourth MOS tube are turned on at the same time, and the second MOS tube and the third MOS tube are turned on at the same time; The CLC filter unit includes a filter inductor, a first filter capacitor and a second filter capacitor, the front end of the filter inductor is connected to the output end of the PFC step-up unit, the rear end of the filter inductor is used as the output end of the CLC filter unit, and the first filter The capacitor is connected between the front end of the filter inductor and the ground, and the second filter capacitor is connected between the rear end of the filter inductor and the ground. The utility model can improve conversion efficiency, realize fanless cooling requirements, and reduce noise.

Description

An intelligent sine wave voltage conversion circuit based on MOS transistor full-bridge rectification

technical field

The utility model relates to a voltage conversion circuit, in particular to an intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification.

Background technique

In the prior art, the AC-to-AC intelligent buck-boost conversion device is also called a travel socket, and the voltage conversion circuit is a key circuit applied to an AC-to-AC intelligent buck-boost conversion device, also known as a travel socket. The function of stepping down and stabilizing voltage and frequency in AC/AC conversion. At present, in AC/AC portable equipment, most of the rectifiers use diodes or rectifier bridges as rectifier components. When the AC voltage reaches 90V, the rectifier diodes or bridge stacks will heat up severely. Therefore, fans need to be added to portable AC-AC equipment. Heat dissipation, but this method will bring noise problems, and the input PF value is low. In practical applications, due to the high-speed switching of the switching tube during the voltage conversion process, there will be a certain high-frequency pulse signal on the output side of the circuit, which will affect the quality of the output voltage, so it is difficult to meet the conversion requirements.

Utility model content

The technical problem to be solved by the utility model is to provide a MOS tube-based device that can improve the PF value of the voltage conversion device, filter out high-frequency crosstalk, reduce noise, reduce product cost, and reduce product volume in view of the deficiencies in the prior art. Intelligent sine wave voltage conversion circuit for full bridge rectification.

In order to solve the above technical problems, the utility model adopts the following technical solutions.

An intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification, which includes: an AC input unit for connecting to AC power; a MOS tube full-bridge rectifier unit including a first MOS tube, a second MOS tube tube, the third MOS tube, the fourth MOS tube and the first capacitor, the drain of the first MOS tube and the source of the third MOS tube are connected to the first output terminal of the AC input unit, the second MOS Both the drain of the tube and the source of the fourth MOS tube are connected to the second output terminal of the AC input unit, and the source of the first MOS tube and the source of the second MOS tube are connected to each other as a MOS tube for full-bridge rectification The positive pole of the output end of the unit, the drain of the third MOS transistor and the drain of the fourth MOS transistor are connected to each other as the negative pole of the output end of the MOS transistor full-bridge rectifier unit, the gate of the first MOS transistor, the second The gate of the MOS transistor, the gate of the third MOS transistor and the gate of the fourth MOS transistor are respectively used to access the PWM pulse signal, so that the first MOS transistor and the fourth MOS transistor are turned on at the same time, and the first MOS transistor and the fourth MOS transistor are turned on at the same time. The two MOS tubes and the third MOS tube are turned on at the same time, and the first capacitor is connected in parallel to the output end of the MOS tube full-bridge rectifier unit; a PFC step-up unit is connected to the output end of the MOS tube full-bridge rectifier unit, and the PFC The boost unit is used to boost the output voltage of the MOS tube full-bridge rectifier unit; a CLC filter unit includes a filter inductor, a first filter capacitor and a second filter capacitor, and the front end of the filter inductor is connected to the PFC booster The output terminal of the voltage unit, the rear end of the filter inductor is used as the output end of the CLC filter unit, the first filter capacitor is connected between the front end of the filter inductor and the ground, and the second filter capacitor is connected after the filter inductor Between the terminal and the ground; an inverter and phase-inverting unit, connected to the output terminal of the CLC filter unit, the inverter and phase-inversion unit is used to invert the output voltage of the CLC filter unit into alternating current.

Preferably, the PFC boost unit includes a boost inductor, a first switch tube, a first rectifier diode and an electrolytic capacitor, the front end of the boost inductor is connected to the output end of the input unit, and the rear of the boost inductor The terminal is connected to the drain of the first switch tube, the source of the first switch tube is grounded, the gate of the first switch tube is used to access a PWM control signal, and the drain of the first switch tube is connected to The anode of the first rectifier diode, the cathode of the first rectifier diode is used as the output end of the PFC boost unit, and the cathode of the first rectifier diode is connected to the positive pole of the electrolytic capacitor, and the negative pole of the electrolytic capacitor is grounded.

Preferably, a pull-down resistor is connected between the gate and the source of the first switch transistor.

Preferably, it also includes a control unit, the gate of the first MOS transistor, the gate of the second MOS transistor, the gate of the third MOS transistor, the gate of the fourth MOS transistor and the gate of the first switch transistor They are respectively electrically connected to the control unit, and the on-off states of the first MOS tube, the second MOS tube, the third MOS tube, the fourth MOS tube and the first switch tube are controlled by the control unit.

Preferably, the first output terminal and the second output terminal of the AC input unit are respectively connected to the control unit through a current limiting resistor, so that the control unit can obtain the phase of the AC voltage.

Preferably, the AC input unit includes a socket, a first fuse, a lightning protection resistor, a common-mode suppression inductor and a safety capacitor, the first fuse is connected in series with the neutral wire or live wire of the socket, and the common-mode suppression The front end of the inductance is connected in parallel to the socket, the lightning protection resistor is connected in parallel to the front end of the common mode suppression inductor, the safety capacitor is connected in parallel to the rear end of the common mode suppression inductor, and the rear end of the common mode suppression inductor is used as an AC input unit output terminal.

Preferably, it also includes a DC voltage sampling unit, the DC voltage sampling unit includes a second sampling resistor and a third sampling resistor connected in series in sequence, the front end of the second sampling resistor is connected to the output end of the CLC filter unit, so The rear end of the third sampling resistor is connected to the control unit, and the control unit collects the electrical signal output by the CLC filter unit through the second sampling resistor and the third sampling resistor.

Preferably, the inverter inverter unit includes an inverter bridge composed of a second switch tube, a third switch tube, a fourth switch tube and a fifth switch tube, the gate of the second switch tube, the third switch tube The grid of the tube, the grid of the fourth switching tube, and the grid of the fifth switching tube are respectively connected to the control unit, and the fourth switching tube, the fifth switching tube, the sixth switching tube, and the fifth switching tube are controlled by the control unit. The seven switch tubes are turned on or off, so that the inverter and inversion unit outputs an AC voltage.

Preferably, a second fuse is connected in series with the output end of the inverter and inverter unit.

Preferably, the control unit includes a single chip microcomputer and its peripheral circuits.

In the intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification disclosed by the utility model, the AC input unit is connected to the AC power supply so that the AC power is transmitted to the MOS tube full-bridge rectifier unit. In the MOS tube full-bridge rectifier unit, when When L is a sine half cycle, the second MOS tube and the third MOS tube are turned on, and the current is formed by the live L line, the second MOS tube, the first capacitor, and the third MOS tube. When the N line is a sine half cycle, the first A MOS tube and the fourth MOS tube are turned on, and the current is formed by the N line, the first MOS tube, the first capacitor, and the fourth MOS tube; through the above process, a DC voltage is formed on the first capacitor, and the first capacitor is In order to filter the rectified ripple, and then obtain a smooth DC and transmit it to the PFC boost unit for boost conversion, and finally use the inverter inverter unit to invert the output voltage of the PFC boost unit into AC for use. In the above-mentioned voltage conversion circuit, since the conduction internal resistance of the MOS tube is very small, the power consumption of the current on the MOS tube is very small, so the efficiency after rectification will be very high, and the PF value of the voltage conversion device can be effectively improved. At the same time, there is no need for a fan to dissipate heat, thereby reducing noise, reducing product cost, and reducing product volume. In addition, under the action of the CLC filter unit, the high-frequency components in the envelope half-wave level containing high-frequency pulses in the circuit can be filtered out, and only the low-frequency components are left to be transmitted to the inverter inverter unit, so that the inverter inverter The phase unit is converted into a higher quality sinusoidal alternating current, thereby greatly improving the quality of the output voltage.

Description of drawings

Figure 1 is a circuit schematic diagram of a sine wave voltage conversion circuit.

Figure 2 is a circuit block diagram of the control unit.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in more detail.

The utility model discloses an intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification, as shown in Fig. 1 and Fig. 2, which includes:

An AC input unit 10, used for accessing AC power;

A MOS transistor full-bridge rectifier unit 20, including a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4 and a first capacitor C1, the drain of the first MOS transistor Q1 and the source of the third MOS transistor Q3 are connected to the first output terminal of the AC input unit 10, and the drain of the second MOS transistor Q2 and the source of the fourth MOS transistor Q4 are connected to the first output terminal of the AC input unit 10. Two output terminals, the source of the first MOS transistor Q1 and the source of the second MOS transistor Q2 are connected to each other as the positive output terminal of the MOS transistor full-bridge rectifier unit 20, and the drain of the third MOS transistor Q3 and The drains of the fourth MOS transistor Q4 are connected to each other as the negative pole of the output end of the MOS transistor full-bridge rectifier unit 20, the gate of the first MOS transistor Q1, the gate of the second MOS transistor Q2, and the gate of the third MOS transistor Q3 The gate and the gate of the fourth MOS transistor Q4 are respectively used to access the PWM pulse signal to make the first MOS transistor Q1 and the fourth MOS transistor Q4 conduct simultaneously, and the second MOS transistor Q2 and the third MOS transistor Q2 The tube Q3 is turned on at the same time, and the first capacitor C1 is connected in parallel to the output end of the MOS tube full-bridge rectifier unit 20;

A PFC step-up unit 30 is connected to the output end of the MOS transistor full-bridge rectifier unit 20, and the PFC step-up unit 30 is used for step-up conversion of the output voltage of the MOS transistor full-bridge rectifier unit 20;

A CLC filter unit 40 includes a filter inductor L3, a first filter capacitor C2 and a second filter capacitor C3, the front end of the filter inductor L3 is connected to the output end of the PFC boost unit 30, and the rear end of the filter inductor L3 As the output terminal of the CLC filter unit 40, the first filter capacitor C2 is connected between the front end of the filter inductor L3 and the ground, and the second filter capacitor C3 is connected between the rear end of the filter inductor L3 and the ground;

An inverter inverter unit 60 is connected to the output terminal of the CLC filter unit 40, and the inverter inverter unit 60 is used to invert the output voltage of the CLC filter unit 40 into an alternating current.

In the above-mentioned intelligent sine wave voltage conversion circuit, the AC input unit 10 is connected to the AC power supply so that the AC power is transmitted to the MOS tube full-bridge rectifier unit 20. In the MOS tube full-bridge rectifier unit 20, when L is a sine half cycle, the first The second MOS transistor Q2 and the third MOS transistor Q3 are turned on, and the current is formed by the fire L line, the second MOS transistor Q2, the first capacitor C1, and the third MOS transistor Q3. When the N line is a sinusoidal half cycle, the first MOS transistor Q1 and the fourth MOS transistor Q4 are turned on, and the current is formed into a loop by the N line, the first MOS transistor Q1, the first capacitor C1, and the fourth MOS transistor Q4; through the above process, a DC voltage is formed on the first capacitor C1, and the first capacitor C1 forms a DC voltage. A capacitor C1 is used to filter out the rectified ripple, and then obtain a smooth direct current and transmit it to the PFC boost unit 30 for boost conversion, and finally use the inverter and inversion unit 60 to convert the output of the PFC boost unit 30 to a sine half wave The voltage is inverted into a sinusoidal alternating current for use. In the above voltage conversion circuit, the MOS tube is used as the rectifier device. Since the conduction internal resistance of the MOS tube is very small, the power consumption of the current on the MOS tube is very small, so the efficiency after rectification will be very high, and it can be effectively The PF value of the voltage conversion device is improved without a fan for heat dissipation, thereby reducing noise, reducing product cost, and reducing product volume. Under the action of the CLC filtering unit 40, the high-frequency components in the envelope half-wave level containing high-frequency pulses in the circuit can be filtered out, and only the low-frequency components are left to be transmitted to the inverting and inverting unit 60, so that the inverting and inverting The phase unit 60 is converted into higher-quality sinusoidal alternating current, thereby greatly improving the quality of the output voltage.

In order to make the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, and the fourth MOS transistor Q4 respond quickly, the utility model adopts four resistors (R1, R2, R3, R4), which are respectively used as four The pull-down resistance of the rectifier MOS tube is used to prevent false conduction.

Regarding the boost part, the PFC boost unit 30 includes a boost inductor L2, a first switch tube Q5, a first rectifier diode D1 and an electrolytic capacitor C2, and the front end of the boost inductor L2 is connected to the output of the input unit 10 end, the rear end of the boost inductor L2 is connected to the drain of the first switching tube Q5, the source of the first switching tube Q5 is grounded, and the gate of the first switching tube Q5 is used to connect to a PWM control signal, the drain of the first switching tube Q5 is connected to the anode of the first rectifying diode D1, the cathode of the first rectifying diode D1 is used as the output end of the PFC boost unit 30, and the cathode of the first rectifying diode D1 Connect the positive pole of the electrolytic capacitor C2, and the negative pole of the electrolytic capacitor C2 is grounded.

Further, a pull-down resistor R5 is connected between the gate and the source of the first switching transistor Q5.

In the above-mentioned PFC step-up unit 30, if the input grid voltage is lower than 230V, the control unit outputs the high-frequency control signal PWM5 to the GATE of the first switching tube Q5, and the half-wave AC voltage rectified by the full bridge composed of four MOS tubes is received by the first switching tube Q5. A switch tube Q5 boosts the voltage in the PFC boost mode. The specific boost principle is: when the first switch tube Q5 is turned on, the current on the first capacitor C1 is formed by the boost inductor L2 and the first switch tube Q5 to GND. In the loop, the boost inductor L2 stores energy; when the first switch tube Q5 is turned off, an induced electromotive force much higher than the input voltage will be formed on the boost inductor, and the induced electromotive force will be formed after being rectified by the first rectifier diode D1 of the freewheeling tube The unidirectional pulsating voltage is sent to the high-frequency filter circuit for filtering. And the first switching tube Q5 is based on the input grid voltage collected by the AC sampling circuit as the modulation fundamental wave to control the change of the duty cycle of PWM1, and the level rectified by the first rectifier diode D1 changes sinusoidally but contains high frequency The envelope half-wave level of the pulse. When the input grid voltage is equal to or greater than 230V, the single-chip microcomputer U1 turns off the high-frequency modulation circuit, and the first switch tube Q5 does not work; the voltage after MOS full-bridge rectification and filtering is directly output through L2 and the first rectifier diode D1.

In order to realize closed-loop control, this embodiment also includes a control unit 70, the gate of the first MOS transistor Q1, the gate of the second MOS transistor Q2, the gate of the third MOS transistor Q3, the gate of the fourth MOS transistor Q4 The gate and the gate of the first switching transistor Q5 are electrically connected to the control unit 70, and the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3, and the fourth MOS transistor are controlled by the control unit 70. The on-off state of the tube Q4 and the first switch tube Q5. Further, the control unit 70 includes a single-chip microcomputer U1 and its peripheral circuits.

Further, regarding the sampling of the AC signal, the first output terminal and the second output terminal of the AC input unit 10 are respectively connected to the control unit 70 through a current limiting resistor, so that the control unit 70 obtains the phase of the AC voltage. Specifically, the control unit samples the amplitude and phase of the AC voltage through sampling resistors (R10, R11, R12, R14, R17, R18, R19, R20), and then controls the first MOS transistor Q1, the second MOS transistor Q2, the The conduction phase and time of the third MOS transistor Q3 and the fourth MOS transistor Q4.

In this embodiment, the AC input unit 10 includes a socket, a first fuse F2, a lightning protection resistor RV1, a common-mode suppression inductor L1, and a safety capacitor CX1, and the first fuse F2 is connected in series with the neutral line of the socket or On the live line, the front end of the common-mode suppression inductor L1 is connected in parallel to the socket, the lightning protection resistor RV1 is connected in parallel to the front end of the common-mode suppression inductor L1, and the safety capacitor CX1 is connected in parallel to the rear end of the common-mode suppression inductor L1, and The rear end of the common mode suppression inductor L1 is used as the output end of the AC input unit 10 .

As a preferred manner, this embodiment also includes a DC voltage sampling unit 40, the DC voltage sampling unit 40 includes a second sampling resistor R13 and a third sampling resistor R15 connected in series in sequence, the second sampling resistor R13 The front end is connected to the output end of the CLC filter unit 40, and the rear end of the third sampling resistor R15 is connected to the control unit 70, and the control unit 70 is used to collect the CLC filter filter by the second sampling resistor R13 and the third sampling resistor R15. The electrical signal output by the unit 40. The above-mentioned voltage sampling part is composed of R13 and R15, and is used to send the collected voltage to the control unit, and then determine the phase and conduction time of the inverter unit.

Regarding the inverter part, the inverter inverter unit 60 includes an inverter bridge composed of the second switch tube Q6, the third switch tube Q7, the fourth switch tube Q8 and the fifth switch tube Q9, the second switch tube The gate of Q6, the gate of the third switch Q7, the gate of the fourth switch Q8 and the gate of the fifth switch Q9 are respectively connected to the control unit 70, and the fourth switch is controlled by the control unit 70. The transistor Q1 , the fifth switching transistor Q2 , the sixth switching transistor Q3 and the seventh switching transistor Q4 are turned on or off, so that the inverter unit 60 outputs an AC voltage. Further, a second fuse F1 is connected in series with the output end of the inverter and inverting unit 60 .

The inverter and phase inverting unit 50 is composed of the second switching tube Q6, the third switching tube Q7, the fourth switching tube Q8 and the fifth switching tube Q9, and the filtered DC voltage is composed of the second switching tube Q6, the load, the fifth switching tube The switch tube Q9 forms a loop to supply power to the load, forming the first half-cycle power frequency level; the second half-cycle power frequency level forms a loop through the fourth switch tube Q8, the load, and the third switch tube Q7, so that on the load A complete power frequency correction wave AC voltage is formed. The PWM signal output by the control unit is sent to the GATE poles of the second switching tube Q6, the third switching tube Q7, the fourth switching tube Q8 and the fifth switching tube Q9 respectively through the driving circuit to send PWM6, PWM7L, PWM8, PWM9L. The phase and frequency in the inverter inverter circuit work according to the mode set inside the control chip.

The intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification disclosed by the utility model has the characteristics of high efficiency, high PF value, etc., and at the same time does not need a fan, and adopts a natural cooling method to eliminate noise. The utility model can automatically adjust the output voltage within the full input voltage range, and the output frequency is fixed, and the output voltage is output as a sine wave, and has an automatic shaping function for the AC voltage. In addition, the utility model contains a voltage and current sampling circuit, which can Anti-surge voltage and current.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. All modifications, equivalent replacements or improvements made within the technical scope of the utility model should be included in the protection of the utility model. In the range.

Claims (10)

1. An intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification, is characterized in that, comprising: An AC input unit, used for accessing AC power; A MOS tube full-bridge rectifier unit, including a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube and a first capacitor, the drain of the first MOS tube and the source of the third MOS tube Both poles are connected to the first output end of the AC input unit, the drain of the second MOS transistor and the source of the fourth MOS transistor are connected to the second output end of the AC input unit, and the source of the first MOS transistor pole and the source of the second MOS transistor are connected to each other as the output positive pole of the MOS transistor full-bridge rectifier unit, and the drain of the third MOS transistor and the drain of the fourth MOS transistor are connected to each other as the MOS transistor full-bridge rectifier The negative electrode of the output terminal of the unit, the gate of the first MOS transistor, the gate of the second MOS transistor, the gate of the third MOS transistor and the gate of the fourth MOS transistor are respectively used to access the PWM pulse signal, so that The first MOS transistor and the fourth MOS transistor are turned on at the same time, the second MOS transistor and the third MOS transistor are turned on at the same time, and the first capacitor is connected in parallel to the output end of the MOS transistor full-bridge rectifier unit; A PFC boost unit, connected to the output end of the MOS tube full-bridge rectifier unit, the PFC boost unit is used to boost the output voltage of the MOS tube full-bridge rectifier unit; A CLC filter unit, including a filter inductor, a first filter capacitor and a second filter capacitor, the front end of the filter inductor is connected to the output end of the PFC step-up unit, and the rear end of the filter inductor is used as the output end of the CLC filter unit , the first filter capacitor is connected between the front end of the filter inductor and the ground, and the second filter capacitor is connected between the back end of the filter inductor and the ground; An inverter and phase inversion unit, connected to the output end of the CLC filter unit, the inverter and phase inversion unit is used to invert the output voltage of the CLC filter unit into alternating current. 2. The intelligent sine wave voltage conversion circuit based on MOS transistor full-bridge rectification as claimed in claim 1, wherein the PFC boost unit includes a boost inductor, a first switch tube, a first rectifier diode and An electrolytic capacitor, the front end of the boost inductor is connected to the output end of the input unit, the rear end of the boost inductor is connected to the drain of the first switch tube, the source of the first switch tube is grounded, and the first switch tube is grounded. The gate of a switch tube is used to access a PWM control signal, the drain of the first switch tube is connected to the anode of the first rectifier diode, and the cathode of the first rectifier diode is used as the output end of the PFC boost unit, and The cathode of the first rectifying diode is connected to the positive pole of the electrolytic capacitor, and the negative pole of the electrolytic capacitor is grounded. 3. The intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification as claimed in claim 2, wherein a pull-down resistor is connected between the gate and the source of the first switching tube. 4. The intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification as claimed in claim 3, further comprising a control unit, the grid of the first MOS tube, the grid of the second MOS tube pole, the gate of the third MOS transistor, the gate of the fourth MOS transistor and the gate of the first switch transistor are respectively electrically connected to the control unit, and the first MOS transistor and the second MOS transistor are controlled by the control unit. , the on-off states of the third MOS tube, the fourth MOS tube and the first switch tube. 5. The intelligent sine wave voltage conversion circuit based on MOS transistor full-bridge rectification as claimed in claim 4, wherein the first output terminal and the second output terminal of the AC input unit are respectively connected through a current-limiting resistor In the control unit, so that the control unit obtains the phase of the AC voltage. 6. The intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification as claimed in claim 1, wherein the AC input unit includes a socket, a first insurance, a lightning protection resistor, a common-mode suppression inductor and Safety capacitance, the first insurance is connected in series with the zero line or live line of the socket, the front end of the common mode suppression inductor is connected in parallel with the socket, the lightning protection resistor is connected in parallel with the front end of the common mode suppression inductor, and the safety regulation The capacitor is connected in parallel to the rear end of the common mode suppression inductor, and the rear end of the common mode suppression inductor is used as the output end of the AC input unit. 7. The intelligent sine wave voltage conversion circuit based on MOS transistor full-bridge rectification as claimed in claim 4, further comprising a DC voltage sampling unit, said DC voltage sampling unit comprising second sampling units connected in series in sequence resistor and the third sampling resistor, the front end of the second sampling resistor is connected to the output end of the CLC filter unit, and the rear end of the third sampling resistor is connected to the control unit, by the second sampling resistor and the third sampling resistor The resistor makes the control unit collect the electrical signal output by the CLC filter unit. 8. The intelligent sine wave voltage conversion circuit based on MOS tube full-bridge rectification as claimed in claim 4, wherein the inverter and phase inverting unit comprises a second switching tube, a third switching tube, a fourth switching tube tube and the fifth switching tube, the grid of the second switching tube, the grid of the third switching tube, the grid of the fourth switching tube and the grid of the fifth switching tube are respectively connected to the control unit The fourth switch tube, the fifth switch tube, the sixth switch tube, and the seventh switch tube are controlled to be turned on or off by the control unit, so that the inverter and inverter unit outputs an AC voltage. 9. The intelligent sine wave voltage conversion circuit based on MOS transistor full-bridge rectification as claimed in claim 8, characterized in that, the output terminal of the inverter and phase inversion unit is connected in series with a second fuse. 10. The intelligent sine wave voltage conversion circuit based on MOS transistor full-bridge rectification according to claim 4, wherein the control unit includes a single-chip microcomputer and its peripheral circuits.