WO2018126554A1

WO2018126554A1 - Smart correction wave voltage conversion circuit based on pfc, full bridge, and half bridge

Info

Publication number: WO2018126554A1
Application number: PCT/CN2017/080980
Authority: WO
Inventors: 廖志刚
Original assignee: 广东百事泰电子商务股份有限公司
Priority date: 2017-01-04
Filing date: 2017-04-19
Publication date: 2018-07-12
Also published as: CN106787807A

Abstract

A smart correction wave voltage conversion circuit based on PFC, full bridge, and half bridge, comprising: an input unit (10), a PFC boost unit (20), a full bridge isolation transformation unit (30), and a phase inversion unit (40). The full bridge isolation transformation unit (30) comprises a first switch transistor (Q6), a second switch transistor (Q7), a sixth transistor (Q8), a seventh switch transistor (Q9), a transformer (T1), a first diode (D5), a second diode (D6), and a wave filter inductor (L3); a source electrode of the sixth switch transistor (Q8) is connected to a first end of a primary winding of the transformer (T1), a drain electrode of the second switch transistor (Q7) is connected to a second end of the primary winding of the transformer (T1), a source electrode of the first switch transistor (Q6) is connected to the second end of the primary winding of the transformer (T1), a drain electrode of the seventh switch transistor (Q9) is connected to the first end of the primary winding of the transformer (T1), and a middle tap of the secondary winding of the transformer (T1) is connected to a rear end ground. The present circuit can improve the power factor value and the output voltage quality.

Description

Intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge

Technical field

The invention relates to a voltage conversion circuit, in particular to an intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge.

Background technique

In the prior art, the intelligent buck-boost conversion device from AC to AC is also called a travel plug. In this device, the voltage conversion circuit is a key circuit thereof, and is a circuit capable of realizing AC-AC conversion, which can be AC-AC conversion realizes the function of buck-boost and stabilizes voltage and frequency. However, most of the current AC-AC portable device market is a non-isolated topology circuit with low PF value, low output voltage quality, and poor safety and reliability.

Summary of the invention

The technical problem to be solved by the present invention is to provide an intelligent correction based on PFC, full bridge and half bridge which can improve the PF value of the voltage conversion device, improve the output voltage quality, and is safe and reliable. Wave voltage conversion circuit.

In order to solve the above technical problems, the present invention adopts the following technical solutions.

An intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge, comprising: an input unit for providing a DC voltage; and a PFC boost unit connected to an output end of the input unit for The output voltage of the input unit is boosted and converted; a full bridge isolation conversion unit includes a first switch tube, a second switch tube, a sixth switch tube, a seventh switch tube, a transformer, a first diode, and a second a pole tube and a filter inductor, a drain of the sixth switch tube is connected to an output end of the PFC boost unit, a source of the sixth switch tube is connected to a first end of the transformer primary winding, and the second switch tube The drain is connected to the second end of the primary winding of the transformer, the source of the second switching transistor is connected to the front end, and the drain of the first switching transistor is connected to the output end of the PFC boosting unit, the first a source of the switch tube is connected to the second end of the primary winding of the transformer, a drain of the seventh switch tube is connected to the first end of the primary winding of the transformer, and a source of the seventh switch tube is connected to the front end, The gate of the first switch tube, the first a gate of the switch tube, a gate of the sixth switch tube, and a gate of the seventh switch tube are respectively used for accessing a PWM pulse signal, and a middle tap of the transformer secondary winding is connected to a back end ground, the transformer secondary a first end of the winding is connected to the anode of the first diode, a cathode of the first diode is connected to the back end through a first capacitor, and a cathode of the first diode is connected to a front end of the filter inductor a second end of the transformer secondary winding is connected to a cathode of the second diode, and an anode of the second diode is connected to the second through a second capacitor Endly, the back end of the filter inductor and the anode of the second diode are used as an output end of the full bridge isolation conversion unit; an inverter inverter unit is connected to the output end of the full bridge isolation conversion unit, the inverter The inverter unit is configured to perform inverter conversion on the output voltage of the full bridge isolation conversion unit and output AC power.

Preferably, the input unit comprises a socket, an insurance, a lightning protection resistor, a common mode suppression inductor, a safety capacitor and a rectifier bridge, wherein the fuse is connected to a neutral or a live line of the socket, and the common mode suppresses the inductance. The front end 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, and the input terminals of the safety capacitor and the rectifier bridge are both connected in parallel with the rear end of the common mode suppression inductor, and the output ends of the rectifier bridge are connected in parallel Filter capacitor.

Preferably, the PFC boosting unit includes a boosting inductor, a third switching transistor, a first rectifier diode and a second electrolytic capacitor, and a front end of the boosting inductor is connected to an output end of the input unit, the boosting inductor The back end is connected to the drain of the third switch tube, the source of the third switch tube is connected to the front end, and the gate of the third switch tube is used to access a PWM control signal, the third switch tube The drain 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 boosting unit, and the cathode of the first rectifier diode is connected to the anode of the second electrolytic capacitor, and the cathode of the second electrolytic capacitor Connect to the front end.

Preferably, the method further includes an MCU control unit, a gate of the first switch tube, a gate of the second switch tube, a gate of the third switch tube, a gate of the sixth switch tube, and a gate of the seventh switch tube. The poles are respectively connected to the MCU control unit, and the MCU control unit is configured to respectively output PWM signals to the first switch tube, the second switch tube, the third switch tube, the sixth switch tube and the seventh switch tube to control the first switch The on and off states of the tube, the second switch tube, the third switch tube, the sixth switch tube, and the seventh switch tube.

Preferably, the method further includes an AC sampling unit connected between the input end of the input unit and the MCU control unit, wherein the AC sampling unit is configured to collect the voltage of the AC side of the input unit and feed back to the MCU control unit.

Preferably, the AC sampling unit includes an operational amplifier, and two input ends of the operational amplifier are respectively connected to an input end of the input rectifying and filtering unit through a current limiting resistor, and an output end of the operational amplifier is connected to the MCU control unit. .

Preferably, a first sampling resistor is connected between the source and the front end of the third switching transistor, and a source of the third switching transistor is connected to the MCU control unit, and the MCU is used by the first sampling resistor. The control unit collects an electrical signal of the source of the third switching transistor.

Preferably, the method further includes a second sampling resistor and a third sampling resistor connected in series, the front end of the second sampling resistor is connected to an output end of the full bridge isolation conversion unit, and the back end of the third sampling resistor is connected The MCU control unit causes the MCU control unit to acquire an electrical signal output by the full bridge isolation transform unit by the second sampling resistor and the third sampling resistor.

Preferably, the inverter inverting unit comprises a fourth switching tube, a fifth switching tube, a third electrolytic capacitor and a fourth electrolytic capacitor, and a drain of the fourth switching tube is connected to an output of the full bridge isolation conversion unit. The anode of the fourth switch tube is connected to the drain of the fifth switch tube, the source of the fifth switch tube is connected to the output terminal of the full bridge isolation converter unit, and the fourth switch tube The gates of the gate and the fifth switch tube are respectively used to connect two PWM pulse signals with opposite phases, the anode of the third electrolytic capacitor is connected to the drain of the fourth switch tube, and the cathode of the third electrolytic capacitor Connecting the back end, the cathode of the third electrolytic capacitor is further connected to the anode of the fourth electrolytic capacitor, the cathode of the fourth electrolytic capacitor is connected to the source of the fifth switching transistor, and the source of the fourth switching transistor And a negative electrode of the third electrolytic capacitor is used as an output end of the inverter inverting unit.

Preferably, a first resistor is connected between the gate and the source of the fourth switching transistor, and a second resistor is connected between the gate and the source of the fifth switching transistor.

In the intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge disclosed in the invention, the DC voltage outputted by the input unit is boosted by the PFC boosting unit, and then output to the full bridge isolation conversion unit, In the bridge isolation conversion unit, when the first switching tube and the seventh switching tube are turned on, the current is formed by the first switching tube, the transformer primary coil, and the seventh switching tube to the front end, and the voltage of the primary winding of the transformer is directly on the bottom. Negative, then coupled to the transformer secondary through the transformer core, the second diode is filtered by the reverse voltage to the second capacitor, forming a DC voltage on the second capacitor; when the second switch and When the sixth switch tube is turned on, the current is formed by the second switch tube, the transformer primary coil, and the sixth switch tube to the front end, and the transformer primary winding voltage is up and down, and then coupled to the transformer secondary through the transformer core. At this time, the voltage passing through the first diode is a forward voltage, and is transmitted to the first capacitor, and a DC voltage that is positive and negative is formed on the first capacitor, so that the DC bus is present. Positive and negative voltages is formed. The first capacitor, the second capacitor and the filter inductor form a filter circuit. And by changing the turns ratio of the primary and secondary of the transformer, the output voltage can be adjusted to achieve boost or buck conversion. Based on the above structure, the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.

DRAWINGS

1 is a schematic diagram of a modified wave voltage conversion circuit of the present invention.

2 is a circuit schematic diagram of an AC sampling unit in a preferred embodiment of the present invention.

3 is a circuit schematic diagram of an MCU control unit in a preferred embodiment of the present invention.

detailed description

The invention will now be described in greater detail with reference to the drawings and embodiments.

The invention discloses an intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge. As shown in FIG. 1 to FIG. 3, it comprises:

An input unit 10 for providing a DC voltage;

a PFC boosting unit 20 is connected to the output end of the input unit 10 for boosting the output voltage of the input unit 10;

A full bridge isolation conversion unit 30 includes a first switch tube Q6, a second switch tube Q7, a sixth switch tube Q8, a seventh switch tube Q9, a transformer T1, a first diode D5, and a second diode D6. And a filter inductor L3, the drain of the sixth switch transistor Q8 is connected to the output end of the PFC boost unit 20, and the source of the sixth switch transistor Q8 is connected to the first end of the primary winding of the transformer T1, the first The drain of the second switch Q7 is connected to the second end of the primary winding of the transformer T1, the source of the second switch Q7 is connected to the front end, and the drain of the first switch Q6 is connected to the PFC boost unit 20. The output of the first switch transistor Q6 is connected to the second end of the primary winding of the transformer T1, and the drain of the seventh switch transistor Q9 is connected to the first end of the primary winding of the transformer T1, the seventh The source of the switching transistor Q9 is connected to the front end, and the gate of the first switching transistor Q6, the gate of the second switching transistor Q7, the gate of the sixth switching transistor Q8, and the gate of the seventh switching transistor Q9 are respectively used. In the PWM pulse signal, the middle tap of the secondary winding of the transformer T1 is connected to the back end, and the transformer T1 times The first end of the stage winding is connected to the anode of the first diode D5, the cathode of the first diode D5 is connected to the back end through the first capacitor C7, and the cathode of the first diode D5 is connected to a front end of the filter inductor L3, a second end of the secondary winding of the transformer T1 is connected to a cathode of the second diode D6, and an anode of the second diode D6 is connected to the rear end through a second capacitor C8. The rear end of the filter inductor L3 and the anode of the second diode D6 serve as the output end of the full bridge isolation conversion unit 30;

An inverter inverting unit 40 is connected to an output end of the full-bridge isolation conversion unit 30 for inverting and converting the output voltage of the full-bridge isolation conversion unit 30 to output an alternating current.

In the correction wave voltage conversion circuit, the DC voltage output from the input unit 10 is boosted by the PFC boosting unit 20, and then output to the full-bridge isolation conversion unit 30. In the full-bridge isolation conversion unit 30, the first switch When the tube Q6 and the seventh switch tube Q9 are turned on, the current is formed by the first switch tube Q6, the transformer T1 primary coil, and the seventh switch tube Q9 to the front end, and the voltage of the primary winding of the transformer T1 is positive and negative, and then passes. The transformer T1 core is coupled to the transformer secondary, the second diode D6 is filtered by the reverse voltage to the second capacitor C8, and a DC voltage is formed on the second capacitor C8; when the second switch Q7 When the sixth switch tube Q8 is turned on, the current is formed by the second switch tube Q7, the transformer T1 primary coil, and the sixth switch tube Q8 to the front end, and the transformer T1 primary winding voltage is up-down and negative, and then magnetically passed through the transformer T1. The core is coupled to the transformer secondary. At this time, the voltage passing through the first diode D5 is a forward voltage, and is transmitted to the first capacitor C7, and a DC voltage is formed on the first capacitor C7, which is positively and negatively negative. Positive and negative voltages are formed on the bus. The first capacitor C7, the second capacitor C8 and the filter inductor L3 constitute a filter circuit. And by changing the turns ratio of the primary and secondary of the transformer T1, the output voltage can be adjusted to achieve boost or buck conversion. Based on the above structure, the present invention not only realizes the isolated transmission of voltage, but also improves the PF value of the step-up/step-down conversion device, and also improves the output voltage quality, making the voltage conversion process more secure and reliable.

As shown in FIG. 1 , the input unit 10 includes a socket, a fuse F2, a lightning protection resistor RV1, a common mode suppression inductor L1, a safety capacitor CX1, and a rectifier bridge DB1. The fuse F2 is connected in series to the socket. 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 input terminals of the safety capacitor CX1 and the rectifier bridge DB1 are both Parallel to the rear end of the common mode rejection inductor L1, and the filter capacitor C1 is connected in parallel with the output terminal of the rectifier bridge DB1.

In this embodiment, the PFC boosting unit 20 includes a boosting inductor L2, a third switching transistor Q5, a first rectifier diode D1, and a second electrolytic capacitor C2. The front end of the boosting inductor L2 is connected to the input unit 10. The output end of the boosting inductor L2 is connected to the drain of the third switching transistor Q5, the source of the third switching transistor Q5 is connected to the front end, and the gate of the third switching transistor Q5 is used for A PWM control signal is connected, a drain of the third switching transistor Q5 is connected to an anode of the first rectifier diode D1, a cathode of the first rectifier diode D1 is used as an output end of the PFC boosting unit 20, and the first rectification is performed. The cathode of the diode D1 is connected to the anode of the second electrolytic capacitor C2, and the cathode of the second electrolytic capacitor C2 is connected to the front end.

In the PFC boosting unit 20, if the filter capacitor C1 outputs a half-wave AC voltage, the PFC enters the boost mode to increase the PF value of the AC-to-AC intelligent buck conversion topology circuit, and after boosting, filtering through the second electrolytic capacitor C2. The voltage is 400V. The specific boosting principle is as follows: When the third switching transistor Q5 is turned on, the current on the filter capacitor C1 forms a loop through the boost inductor L2 and the third switch transistor Q5 to GND, and the boost inductor L2 stores energy; When the third switching transistor Q5 is turned off, an induced electromotive force is formed on the boosting inductor which is much higher than the input voltage, and the induced electromotive force is rectified by the freewheeling tube D1 to form a unidirectional pulse voltage and then sent to the second electrolytic capacitor C2 capacitor. Filtered and filtered into a DC voltage of 400V. And the third switch tube Q5 increases or decreases the on-time of the third switch tube Q5 according to the change of the input AC correction wave acquired by the control chip, so that the current and the voltage phase are aligned to increase the PF value.

As a preferred manner, referring to FIG. 3, the embodiment further includes an MCU control unit 80, a gate of the first switch tube Q6, a gate of the second switch tube Q7, and a gate of the third switch tube Q5. The gate of the sixth switching transistor Q8 and the gate of the seventh switching transistor Q9 are respectively connected to the MCU control unit 80, and the MCU control unit 80 is configured to respectively output PWM signals to the first switching transistor Q6 and the second switching transistor Q7. a third switch tube Q5, a sixth switch tube Q8, and a seventh switch tube Q9 for controlling the first switch tube Q6, the second switch tube Q7, the third switch tube Q5, the sixth switch tube Q8, and the seventh switch tube Q9 On/off status.

In order to facilitate the monitoring of the electrical signal on the AC side, please refer to FIG. 2 , which further includes an AC sampling unit 70 connected between the input end of the input unit 10 and the MCU control unit 80. The AC sampling unit 70 It is used to collect the voltage of the AC side of the input unit 10 and feed back to the MCU control unit 80.

Further, the AC sampling unit 70 includes an operational amplifier U9B, and two input ends of the operational amplifier U9B are respectively connected to an input end of the input rectifying and filtering unit 10 through a current limiting resistor, and an output end of the operational amplifier U9B Connected to the MCU control unit 80.

In order to facilitate real-time acquisition of the current, a first sampling resistor R2A is connected between the source and the front end of the third switching transistor Q5, and the source of the third switching transistor Q5 is connected to the MCU control unit 80. The first sampling resistor R2A causes the MCU control unit 80 to collect an electrical signal of the source of the third switching transistor Q5.

As a preferred manner, in order to collect the DC side electrical signal, the embodiment further includes a second sampling resistor R13 and a third sampling resistor R15 connected in series, and the front end of the second sampling resistor R13 is connected to the whole An output of the bridge isolation unit 30, a rear end of the third sampling resistor R15 is connected to the MCU control unit 80, and the MCU control unit 80 acquires the second sampling resistor R13 and the third sampling resistor R15. The full bridge isolates the electrical signal output by the transform unit 30.

As shown in FIG. 1 , the inverter inverter unit 40 includes a fourth switch tube Q2 , a fifth switch tube Q4 , a third electrolytic capacitor C3 , and a fourth electrolytic capacitor C5 , and the fourth switch The drain of the transistor Q2 is connected to the anode of the output of the full-bridge isolation converter unit 30, the source of the fourth switch transistor Q2 is connected to the drain of the fifth switch transistor Q4, and the source of the fifth switch transistor Q4 is connected. The anode of the full-bridge isolation conversion unit 30 is negative, the gate of the fourth switching transistor Q2 and the gate of the fifth switching transistor Q4 are respectively used to access two PWM pulse signals of opposite phases, the third electrolytic The anode of the capacitor C3 is connected to the drain of the fourth switch transistor Q2, the cathode of the third electrolytic capacitor C3 is connected to the rear end, and the cathode of the third electrolytic capacitor C3 is also connected to the anode of the fourth electrolytic capacitor C5. The cathode of the fourth electrolytic capacitor C5 is connected to the source of the fifth switching transistor Q4, and the source of the fourth switching transistor Q2 and the cathode of the third electrolytic capacitor C3 serve as the output terminal of the inverter inverting unit 40. Further, a first resistor R17 is connected between the gate and the source of the fourth switching transistor Q2, and a second resistor R23 is connected between the gate and the source of the fifth switching transistor Q4.

In the inverter inverter unit 40, the voltage output by the full-bridge isolation conversion unit 30 forms a loop through the fourth switching transistor Q2, the load, and the fourth electrolytic capacitor C5 to supply a load to form a first half-cycle correction wave level; The half-cycle correction chord level forms a loop through the fifth switch tube Q4, the load, and the third electrolytic capacitor C3, so that a complete power frequency correction wave AC voltage is formed on the load. After the PWM signal outputted by the control chip passes through the driving circuit, PWM2H and PWM2L are respectively sent to the GATE pole of the fourth switching transistor Q2 and the fifth switching transistor Q4. The phase and frequency in the inverter inverter circuit operate in accordance with the mode set in the control chip. At the same time, the third electrolytic capacitor C3 and the fourth electrolytic capacitor C5 are also The filter function can be combined with the filter inductor L3 to form a filter circuit. The inverter circuit has a simple structure, and the circuit only uses two MOS tubes, and the cost is low.

The intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge disclosed in the invention has a high PF value, can realize isolation between the power grid and the output end, and has high security. The output voltage can be automatically adjusted within the input full voltage range, the output frequency can be fixed, and the output voltage is a modified wave output, which has an automatic shaping function for the AC voltage. In addition, the circuit of the invention is simple, convenient to control, and contains voltage and current. Sampling circuit to prevent surge voltage and current.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalents, and improvements made within the technical scope of the present invention are intended to be included within the scope of the present invention.

Claims

An intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge, characterized in that it comprises:

An input unit (10) for providing a DC voltage;

a PFC boosting unit (20) connected to the output end of the input unit (10) for boosting the output voltage of the input unit (10);

A full bridge isolation conversion unit (30) includes a first switch tube (Q6), a second switch tube (Q7), a sixth switch tube (Q8), a seventh switch tube (Q9), a transformer (T1), and a a diode (D5), a second diode (D6) and a filter inductor (L3), the drain of the sixth switch transistor (Q8) being connected to an output of the PFC boost unit (20), a source of the sixth switching transistor (Q8) is connected to the first end of the primary winding of the transformer (T1), and a drain of the second switching transistor (Q7) is connected to the second end of the primary winding of the transformer (T1), a source of the second switching transistor (Q7) is connected to the front end, and a drain of the first switching transistor (Q6) is connected to an output end of the PFC boosting unit (20), and the first switching transistor (Q6) The source is connected to the second end of the primary winding of the transformer (T1), the drain of the seventh switching transistor (Q9) is connected to the first end of the primary winding of the transformer (T1), and the seventh switching tube (Q9) The source is connected to the front end, the gate of the first switch tube (Q6), the gate of the second switch tube (Q7), the gate of the sixth switch tube (Q8), and the seventh switch tube (Q9) The gates are respectively used to access the PWM pulse signal, and the transformer (T1) secondary winding The middle tap is connected to the back end, the first end of the transformer (T1) secondary winding is connected to the anode of the first diode (D5), and the cathode of the first diode (D5) passes the first The capacitor (C7) is connected to the back end, and the cathode of the first diode (D5) is connected to the front end of the filter inductor (L3), and the second end of the secondary winding of the transformer (T1) is connected to the second second a cathode of the pole tube (D6), an anode of the second diode (D6) is connected to the rear end through a second capacitor (C8), a rear end of the filter inductor (L3) and a second diode ( The anode of D6) is used as an output end of the full bridge isolation conversion unit (30); an inverter inverter unit (40) is connected to the output end of the full bridge isolation conversion unit (30), and the inverter inverter unit (40) It is used to invert the output voltage of the full bridge isolation conversion unit (30) and output the alternating current.
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 1, wherein the input unit (10) comprises a socket, a fuse (F2), and a lightning protection resistor (RV1). a common mode suppression inductor (L1), a safety capacitor (CX1), and a rectifier bridge (DB1). The fuse (F2) is connected in series to a neutral or a live line of the socket, and the front end of the common mode suppression inductor (L1) Parallel to the socket, the lightning protection resistor (RV1) is connected in parallel with the front end of the common mode suppression inductor (L1), and the input terminals of the safety capacitor (CX1) and the rectifier bridge (DB1) are connected in parallel to the common mode suppression inductor (L1). The back end of the rectifier bridge (DB1) has a filter capacitor (C1) connected in parallel.
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 1, wherein the PFC boosting unit (20) comprises a boosting inductor (L2) and a third switching transistor. (Q5), a first rectifier diode (D1) and a second electrolytic capacitor (C2), the front end of the boost inductor (L2) is connected to the output of the input unit (10) The back end of the boosting inductor (L2) is connected to the drain of the third switching transistor (Q5), the source of the third switching transistor (Q5) is connected to the front end, and the third switching transistor (Q5) The gate is used to access a PWM control signal, the drain of the third switching transistor (Q5) is connected to the anode of the first rectifier diode (D1), and the cathode of the first rectifier diode (D1) is used as the PFC The output end of the pressing unit (20), and the cathode of the first rectifier diode (D1) is connected to the anode of the second electrolytic capacitor (C2), and the cathode of the second electrolytic capacitor (C2) is connected to the front end.
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 3, further comprising an MCU control unit (80), a gate of said first switching transistor (Q6) The gate of the second switching transistor (Q7), the gate of the third switching transistor (Q5), the gate of the sixth switching transistor (Q8), and the gate of the seventh switching transistor (Q9) are respectively connected to the MCU control unit. (80), the MCU control unit (80) is configured to respectively output PWM signals to the first switch tube (Q6), the second switch tube (Q7), the third switch tube (Q5), and the sixth switch tube (Q8) And a seventh switch tube (Q9) for controlling the first switch tube (Q6), the second switch tube (Q7), the third switch tube (Q5), the sixth switch tube (Q8), and the seventh switch tube (Q9) On/off status.
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 4, further comprising an AC sampling unit (70), wherein the AC sampling unit (70) is connected to the input unit The input terminal of (10) is connected to the MCU control unit (80) for collecting the voltage of the AC side of the input unit (10) and feeding back to the MCU control unit (80).
The intelligent correction wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 5, wherein said AC sampling unit (70) comprises an operational amplifier (U9B), said operational amplifier (U9B) The two inputs are respectively connected to the input of the input rectification filtering unit (10) through a current limiting resistor, and the output of the operational amplifier (U9B) is connected to the MCU control unit (80).
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 4, wherein a first sampling is connected between a source and a front end of the third switching transistor (Q5) a resistor (R2A), a source of the third switching transistor (Q5) is connected to the MCU control unit (80), and the MCU control unit (80) collects the third switching transistor by the first sampling resistor (R2A) (Q5) The electrical signal of the source.
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 4, further comprising a second sampling resistor (R13) and a third sampling resistor (R15) connected in series, a front end of the second sampling resistor (R13) is connected to an output end of the full bridge isolation conversion unit (30), and a rear end of the third sampling resistor (R15) is connected to the MCU control unit (80). The second sampling resistor (R13) and the third sampling resistor (R15) cause the MCU control unit (80) to collect the electrical signal output by the full bridge isolation transform unit (30).
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 4, wherein The inverter inverter unit (40) includes a fourth switch tube (Q2), a fifth switch tube (Q4), a third electrolytic capacitor (C3), and a fourth electrolytic capacitor (C5), the fourth The drain of the switch transistor (Q2) is connected to the anode of the output of the full bridge isolation converter unit (30), and the source of the fourth switch transistor (Q2) is connected to the drain of the fifth switch transistor (Q4). The source of the fifth switching transistor (Q4) is connected to the negative terminal of the output of the full-bridge isolation conversion unit (30), and the gate of the fourth switching transistor (Q2) and the gate of the fifth switching transistor (Q4) are respectively used. The two anodes of opposite phase PWM pulses are connected, the anode of the third electrolytic capacitor (C3) is connected to the drain of the fourth switching transistor (Q2), and the cathode of the third electrolytic capacitor (C3) is connected to the back end. The anode of the third electrolytic capacitor (C3) is also connected to the anode of the fourth electrolytic capacitor (C5), and the cathode of the fourth electrolytic capacitor (C5) is connected to the source of the fifth switching transistor (Q4). The source of the fourth switching transistor (Q2) and the negative terminal of the third electrolytic capacitor (C3) serve as outputs of the inverter inverting unit (40).
The intelligent modified wave voltage conversion circuit based on PFC, full bridge and half bridge according to claim 9, wherein a first resistor is connected between the gate and the source of the fourth switching transistor (Q2) (R17), a second resistor (R23) is connected between the gate and the source of the fifth switching transistor (Q4).