Synchronous rectification type inverter

Abstract

According to the synchronous rectification type inverter, a housekeeper board is used for controlling the rotating speed of an engine, and the housekeeper board communicates with a control unit; the auxiliary power supply supplies power to the starting battery and the housekeeper board. The engine can provide three-phase alternating current output / reverse dragging starting; the AC-DC conversion circuit can provide single-phase AC voltage output / DC boost output; when the engine provides three-phase alternating current output, the starting integrated circuit is used for converting three-phase alternating current voltage output of the engine into direct current; the AC-DC conversion circuit is used for converting direct current into unidirectional alternating current; when the engine is reversely dragged and started, the AC-DC conversion circuit is used for boosting the voltage of the starting battery and providing the boosted voltage to the starting integrated circuit; the overall composite degree is high, the problems of large AC-DC integrated size, high design cost, device redundancy and the like are solved, and the product integration degree is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of digital engines, in particular to a synchronous rectification inverter. Background Art

[0002] A digital variable frequency motor is a motor that uses digital technology and variable frequency technology to control the motor, and can flexibly adjust the frequency and voltage of the output motor. With the rapid development of digital variable frequency engines, the demand for efficiency and highly integrated functions of variable frequency engines is becoming increasingly strong. At present, the three-phase input of the inverter of the digital engine is all made of semi-controlled rectification and DC-AC, and an additional one-button start module is used to piece together. Since each component needs to be designed and integrated separately, the manufacturing cost and system cost are high, resulting in a low cost performance of the product. At the same time, the above-mentioned dispersed components and low integration result in a large engine design, which does not meet the current design requirements for efficient and lightweight products. Therefore, in order to solve the above problems, a synchronous rectification inverter is needed. Utility Model Content

[0003] The utility model aims to provide a highly integrated topological structure to realize the maximum sharing of power devices. Therefore, a synchronous rectification inverter is proposed.

[0004] A specific technical solution of a synchronous rectification inverter is as follows:

[0005] A synchronous rectification inverter, characterized in that:

[0006] It includes a housekeeper board, a control unit, a starting battery, an auxiliary power supply, and an engine, an inspiration integrated circuit, and an AC-DC conversion circuit which are electrically connected in sequence;

[0007] The housekeeper board is used to control the engine speed, and the housekeeper board communicates with the control unit;

[0008] The auxiliary power supplies respectively supply power to the starting battery and the housekeeper board;

[0009] The engine can provide three-phase AC output / reverse start;

[0010] The AC / DC conversion circuit can provide single-phase AC voltage output / DC boost output;

[0011] When the engine provides a three-phase AC output, the integrated circuit is used to convert the three-phase AC voltage output of the engine into DC power;

[0012] The AC / DC conversion circuit is used to convert the DC power into unidirectional AC power;

[0013] When the engine is started by reverse dragging, the AC-DC conversion circuit is used to boost the voltage of the starting battery and provide it to the inspiration integrated circuit;

[0014] The said inspiration integrated circuit converts the boosted DC voltage into three-phase AC power to reversely drive the engine;

[0015] The control unit is used to control the integrated circuit to realize three-phase rectification / three-phase inversion, and the AC / DC conversion circuit to realize single-phase AC voltage output / DC boost output.

[0016] In order to better realize the utility model, it is possible to further:

[0017] The inspiration integrated circuit is a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5 and power tube Q6;

[0018] The source of the power tube Q1 is connected to the drain of the power tube Q2, the source of the power tube Q3 is connected to the drain of the power tube Q4, and the source of the power tube Q5 is connected to the drain of the power tube Q6;

[0019] The drains of the power tubes Q1, Q3 and Q5 are all connected to the positive electrode of the first power port, the sources of the power tubes Q2, Q4 and Q6 are all connected to the negative electrode of the first power port, and the capacitor C1 is connected in series between the positive electrode of the first power port and the negative electrode of the first power port;

[0020] The U phase end of the engine is connected to the common end of the power tube Q1 and the power tube Q2, the V phase end of the engine is connected to the common end of the power tube Q3 and the power tube Q4, and the W phase end of the engine is connected to the common end of the power tube Q5 and the power tube Q6.

[0021] Further: the AC-DC conversion circuit includes a power tube Q7, a power tube Q8, a power tube Q9, and a power tube Q10;

[0022] The source of the power tube Q7 is connected to the drain of the power tube Q8, the source of the power tube Q9 is connected to the drain of the power tube Q10, the drains of the power tubes Q7 and Q9 are both connected to the positive electrode of the first power port, and the drains of the power tubes Q8 and Q10 are both connected to the positive electrode of the first power port;

[0023] The first end of the inductor L1 is connected between the power tube Q7 and the power tube Q8, the second end of the inductor L1 is the first AC output end, the second AC output end is connected between the power tube Q9 and the power tube Q10, and a capacitor C2 is connected between the first AC output end and the second AC output end;

[0024] The second end of the inductor L1 is connected to the positive electrode of the starting battery via the control switch K1, and the negative electrode of the starting battery is connected between the power tube Q9 and the power tube Q10.

[0025] The beneficial effects of the utility model are:

[0026] The overall composite degree is high. The utility model solves the problems of large AC / DC integrated volume, high design cost, device redundancy, etc. by interactively combining the housekeeper board, control unit, starting battery, auxiliary power supply and the engine electrically connected in sequence, inspiration integrated circuit, and AC / DC conversion circuit, thereby greatly improving the product integration.

[0027] The control unit is used to control the three-phase rectification / three-phase inverter of the inspiration integrated circuit, and the unidirectional AC output / DC boost output of the AC / DC conversion circuit. Among them, the inspiration integrated circuit adopts a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5, and power tube Q6, which can realize three-phase rectification / three-phase inverter. At reverse-drag start, when reverse-drag boost is required, when power tube Q10 is turned on and power tube Q9 is turned off, capacitor C1, power tube Q7, power tube Q8, and inductor L1 form a boost circuit. When unidirectional AC output is required, the control unit controls power tube Q7, power tube Q8, power tube Q9 and power tube Q10 through a full-bridge drive algorithm to provide unidirectional AC inverter output. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1 As shown:

[0031] A synchronous rectification inverter comprises a housekeeper board, a control unit, a starting battery, an auxiliary power supply, and an engine, an integrated circuit for inspiration, and an AC / DC conversion circuit which are electrically connected in sequence. The housekeeper board is used to control the engine speed, and the housekeeper board communicates with the control unit; the auxiliary power supply supplies power to the starting battery and the housekeeper board respectively. Specifically, in this embodiment, the housekeeper board adopts a single-chip microcomputer with model number GD32C103CBT6, and the housekeeper board is used for external human-computer interaction, engine start and stop, and speed regulation. The control unit exchanges data with the housekeeper board through TXD / RXD, allowing the housekeeper board to accurately control the engine speed and power generation decisions. The engine can provide three-phase AC output / reverse drag start; the AC / DC conversion circuit can provide single-phase AC voltage output / DC boost output; when the engine provides three-phase AC output, the inspiration integrated circuit is used to convert the three-phase AC voltage output of the engine into DC; the AC / DC conversion circuit is used to convert DC into unidirectional AC; when the engine is reverse-drag started, the AC / DC conversion circuit is used to provide the voltage boost of the starting battery to the inspiration integrated circuit; the inspiration integrated circuit converts the boosted DC voltage into three-phase AC to reverse-drag the engine; the control unit is used to control the inspiration integrated circuit to realize three-phase rectification / three-phase inversion, and the AC / DC conversion circuit to realize single-phase AC voltage output / DC boost output.

[0032] The integrated circuit is a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5 and power tube Q6. The engine has a U-direction end, a V-direction end and a W-direction end. The source level of the power tube Q1 is connected to the drain level of the power tube Q2, the source level of the power tube Q3 is connected to the drain level of the power tube Q4, the source level of the power tube Q5 is connected to the drain level of the power tube Q6, the drain levels of the power tubes Q1, Q3 and Q5 are all connected to the positive pole of the first power port, the source levels of the power tubes Q2, Q4 and Q6 are all connected to the negative pole of the first power port, and a voltage-stabilizing capacitor is connected in series between the positive pole of the first power port and the negative pole of the first power port.

[0033] The U phase end of the engine is connected to the common end of the power tube Q1 and the power tube Q2, the V phase end of the engine is connected to the common end of the power tube Q3 and the power tube Q4, and the W phase end of the engine is connected to the common end of the power tube Q5 and the power tube Q6.

[0034] The AC-DC conversion circuit includes a power tube Q7, a power tube Q8, a power tube Q9 and a power tube Q10;

[0035] The source of the power tube Q7 is connected to the drain of the power tube Q8, the source of the power tube Q9 is connected to the drain of the power tube Q10, the drains of the power tubes Q7 and Q9 are both connected to the positive electrode of the first power port, and the drains of the power tubes Q8 and Q10 are both connected to the positive electrode of the first power port.

[0036] The first end of the inductor L1 is connected between the power tube Q7 and the power tube Q8, the second end of the inductor L1 is the first AC output end, the second AC output end is connected between the power tube Q9 and the power tube Q10, and a capacitor C2 is connected between the first AC output end and the second AC output end.

[0037] The second end of the inductor L1 is connected to the first DC port via the control switch K1, the second AC output end is connected between the power tube Q9 and the power tube Q10, and a capacitor C3 is bridged between the first DC output end and the second DC output end.

[0038] The positive electrode of the battery is connected to the first DC output terminal, the positive electrode of the battery is connected to the second DC output terminal, and the battery provides power for all circuits through the auxiliary power circuit M4.

[0039] The battery is connected between the first DC output terminal and the second DC output terminal. Specifically, the battery is a 60V battery, the positive electrode of the battery is connected to the first DC output terminal, and the negative electrode of the battery is connected to the second DC output terminal.

[0040] The power tube Q1, the power tube Q2, the power tube Q3, the power tube Q4, the power tube Q5, the power tube Q6, the power tube Q7, the power tube Q8, the power tube Q9 and the power tube Q10 are all N-channel MOS tubes.

[0041] The working process of this utility model is:

[0042] The battery reverse start control process is as follows:

[0043] When the battery reverses and drives the engine to rotate, the control unit controls the switch K1 to close, and the AC / DC conversion circuit is configured as a DC boost output mode to provide a DC boost to the inspiration integrated circuit. The control unit turns on the power tube Q10 and turns off the power tube Q9, so that the capacitor C1, the power tube Q7, the power tube Q8, and the inductor L1 form a boost circuit, and the control unit controls the boost circuit to provide a boost for the first power port and the second power port. Specifically, the control unit drives the power tube Q7 and the power tube Q8 to provide a boost for the first power port, so that the voltage between the first power port and the second power port increases, and a stable and reliable DC400±20V voltage is obtained.

[0044] The integrated circuit is configured in a three-phase inverter mode. Power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5, and power tube Q6 constitute a three-phase BLDC drive circuit module. The control unit drives power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5, and power tube Q6 through a three-phase inductive BLDC algorithm, so that the three-phase BLDC drive circuit module inverts the DC power of the first power port into three-phase power and connects it to the engine, thereby realizing engine reverse starting control.

[0045] The engine AC output control process is as follows:

[0046] After the engine is started, the control unit controls the power tube Q10 to open, the K1 switch to disconnect, and the inductance of the inductor L1 is adjusted by the tap.

[0047] The integrated circuit is configured in a three-phase rectification mode. The power tubes Q1, Q2, Q3, Q4, Q5 and Q6 are used as a three-phase synchronous rectification circuit. The control unit drives the three-phase rectification circuit through a three-phase synchronous rectification algorithm to achieve three-phase rectification. At the same time, the real-time speed, rectification voltage and other information of the engine are notified to the housekeeper board through serial communication. The housekeeper board adjusts the engine speed according to the load power to ensure that the voltage between the first DC output terminal and the second DC output terminal is 400±20Vdc.

[0048] After the engine is started, the 12V starting battery needs to be recharged, and the auxiliary power circuit is used to provide a charging strategy for the 12V battery.

[0049] The control unit adjusts the AC / DC conversion circuit to an AC voltage output mode. Power tubes Q7, Q8, Q9 and Q10 form a full-bridge drive circuit. The control unit controls power tubes Q7, Q8, Q9 and Q10 through a full-bridge drive algorithm, so that the full-bridge drive circuit realizes full-bridge AC output.

[0050] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A synchronous rectification inverter, characterized in that: It includes a housekeeper board, a control unit, a starting battery, an auxiliary power supply, and an engine, an inspiration integrated circuit, and an AC-DC conversion circuit which are electrically connected in sequence; The housekeeper board is used to control the engine speed, and the housekeeper board communicates with the control unit; The auxiliary power supplies respectively supply power to the starting battery and the housekeeper board; The engine can provide three-phase AC output / reverse start; The AC / DC conversion circuit can provide single-phase AC voltage output / DC boost output; When the engine provides a three-phase AC output, the integrated circuit is used to convert the three-phase AC voltage output of the engine into DC power; The AC / DC conversion circuit is used to convert the DC power into unidirectional AC power; When the engine is started by reverse dragging, the AC-DC conversion circuit is used to boost the voltage of the starting battery and provide it to the inspiration integrated circuit; The said inspiration integrated circuit converts the boosted DC voltage into three-phase AC power to reversely drive the engine; The control unit is used to control the integrated circuit to realize three-phase rectification / three-phase inversion, and the AC / DC conversion circuit to realize single-phase AC voltage output / DC boost output.

2. A synchronous rectification inverter according to claim 1, characterized in that: The inspiration integrated circuit is a three-phase bridge control circuit composed of power tube Q1, power tube Q2, power tube Q3, power tube Q4, power tube Q5 and power tube Q6; The source of the power tube Q1 is connected to the drain of the power tube Q2, the source of the power tube Q3 is connected to the drain of the power tube Q4, and the source of the power tube Q5 is connected to the drain of the power tube Q6; The drains of the power tubes Q1, Q3 and Q5 are all connected to the positive electrode of the first power port, the sources of the power tubes Q2, Q4 and Q6 are all connected to the negative electrode of the first power port, and a capacitor C1 is connected in series between the positive electrode of the first power port and the negative electrode of the first power port; The U phase end of the engine is connected to the common end of the power tube Q1 and the power tube Q2, the V phase end of the engine is connected to the common end of the power tube Q3 and the power tube Q4, and the W phase end of the engine is connected to the common end of the power tube Q5 and the power tube Q6.

3. A synchronous rectification inverter according to claim 2, characterized in that: The AC-DC conversion circuit includes power tube Q7, power tube Q8, power tube Q9 and power tube Q10; The source of the power tube Q7 is connected to the drain of the power tube Q8, the source of the power tube Q9 is connected to the drain of the power tube Q10, the drains of the power tubes Q7 and Q9 are both connected to the positive electrode of the first power port, and the drains of the power tubes Q8 and Q10 are both connected to the positive electrode of the first power port; The first end of the inductor L1 is connected between the power tube Q7 and the power tube Q8, the second end of the inductor L1 is the first AC output end, the second AC output end is connected between the power tube Q9 and the power tube Q10, and a capacitor C2 is connected between the first AC output end and the second AC output end; The second end of the inductor L1 is connected to the positive electrode of the starting battery via the control switch K1, and the negative electrode of the starting battery is connected between the power tube Q9 and the power tube Q10.

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