Three-stage starting generator system with ac and dc dual outputs and design method

Abstract

The application discloses a three-stage starting generator system with AC and DC double outputs and a design method, and relates to the technical field of starting generators. The system comprises a three-stage starting generator and a controller, the three-stage starting generator comprises a permanent magnet auxiliary exciter, a main exciter, a main motor, a rotary transformer and a rotary rectifier, and the controller comprises a voltage regulating circuit, an AC excitation power supply, a MOS three-phase full bridge, a control circuit, a DC voltage sensor, a three-phase voltage sensor and a current sensor. During starting, the MOS three-phase full bridge adjusts three-phase AC currents of the three-phase armature winding of the main motor, so that the engine can be started. During power generation, three-phase AC voltages output by the three-phase armature winding of the main motor are stabilized at a desired voltage value. Through boost and buck control, the DC voltage output by the MOS three-phase full bridge is stabilized. The switching frequency of the MOS three-phase full bridge for power generation voltage stabilization is the same as the output electric frequency of the generator, and the MOS three-phase full bridge has the characteristics of low loss, low high-frequency ripple spectrum component, weak high-frequency conduction and radiation interference and high power density.

Description

Technical Field

[0001] This invention belongs to the field of generator design technology, specifically relating to a three-stage starter generator system and design method with dual AC and DC outputs, and is particularly suitable for aviation hybrid power systems consisting of 28V low-voltage DC and 115V AC. Background Technology

[0002] In the aviation field, power generation systems based on three-stage generators are the mainstream form of main power, auxiliary power, and ramjet turbine emergency power. Early airborne equipment consumed relatively little power, typically using 28V low-voltage DC power systems. However, with the increase in the power consumption of airborne equipment, 28V low-voltage DC power systems are no longer suitable for aircraft with power consumption exceeding 12kW. Therefore, high-voltage systems have become the development direction, namely, replacing the original 28V low-voltage DC power systems with 115V, 400Hz constant-frequency AC power systems and 115V, 360Hz–800Hz variable-frequency AC power systems. Due to the different requirements of electrical equipment for the form of electrical energy, the main development direction for fighter jets is 270V high-voltage DC power systems. For civilian airliners, helicopters, transport aircraft, and high-end unmanned aerial vehicles (UAVs), the main development direction is AC power systems, including 115V, 400Hz constant-frequency AC power systems and 115V, 360Hz–800Hz variable-frequency AC power systems. However, aircraft emergency batteries still primarily use 28V low voltage; meanwhile, some mature airborne equipment with lower power consumption does not need to be upgraded entirely to high-voltage DC or high-voltage AC power supply, and some airborne equipment still requires 28V low-voltage DC. Therefore, a hybrid power system consisting of 28V low-voltage DC and 115V AC is the mainstream form for civil airliners, helicopters, transport aircraft, and high-end unmanned aerial vehicles.

[0003] Traditional aircraft engines are started using electric starters and air turbine starters. However, once the engine has started, these starters become dead weight, hindering further improvements in aircraft performance. With the development of power electronics technology and the increasing electrification of aircraft, generators that previously only generated electricity can be expanded into starter-generators with both starting and power generation functions, effectively reducing the load on the engine starting system. For engines smaller than 500kW, 28V low-voltage DC power is the primary power source for engine starting.

[0004] Existing aviation hybrid power systems, consisting of 28V low-voltage DC and 115V AC, are generally implemented in the following ways:

[0005] 1. A scheme combining a DC brushed starter generator system and an AC three-stage generator system, where one engine is equipped with two generator systems: one is a DC brushed starter generator system, and the other is an AC three-stage generator system. During startup, a 28V battery supplies power to the DC brushed starter generator system to start the engine. After the engine starts working, it provides mechanical speed input to both the DC brushed starter generator system and the AC three-stage generator system. The DC brushed starter generator system and the AC three-stage generator system convert the input mechanical energy into 28V low-voltage DC and 115V AC electrical energy, respectively.

[0006] 2. The scheme combining a low-voltage DC three-stage starter generator system with an AC three-stage generator system is roughly the same as the scheme combining a DC brushed starter generator system with an AC three-stage generator system, except that the DC brushed starter generator system is replaced by a low-voltage DC three-stage starter generator system, while the functionality remains unchanged.

[0007] 3. A combined AC three-stage starter-generator system, static converter, and transformer-rectifier scheme: The engine is only mechanically connected directly to the AC three-stage starter-generator system. During startup, the static converter converts the 28V battery power into 115V, 400Hz AC power. The AC three-stage starter-generator system then converts the AC power from the static converter into mechanical energy to start the engine. After the engine starts running, it provides mechanical speed input to the AC three-stage starter-generator system. The AC three-stage starter-generator system converts the input mechanical energy into 115V AC power, which is then converted into 28V low-voltage DC power by the transformer-rectifier.

[0008] Option 1, due to its mechanical commutation in the DC brushed starter-generator system, suffers from lower reliability, limiting its application in high-altitude long-range flight, maintenance-free export applications, and coastal salt spray environments. Option 2, employing a low-voltage DC three-stage starter-generator system, eliminates mechanical commutation, making it suitable for high-altitude long-range flight, maintenance-free export applications, and coastal salt spray environments. However, the controller output current is large when starting the engine, resulting in a heavier controller. Furthermore, the power density of the low-voltage DC three-stage starter-generator system is significantly lower than that of the DC brushed starter-generator system. Option 3, while having a simpler mechanical interface between the starter-generator system and the engine and suitable for applications requiring high starting torque, is heavier than the AC three-stage starter-generator system. Additionally, the combined weight of the static converter and transformer rectifier is greater than that of the low-voltage DC three-stage starter-generator system, making power density the main drawback of this option. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of the aforementioned technologies by providing a three-stage starter generator system with both AC and DC outputs; the purpose of this invention is also to address the shortcomings of the aforementioned technologies by providing a design method for a three-stage starter generator system with both AC and DC outputs.

[0010] The present invention provides a three-stage starter-generator system with dual AC and DC outputs, comprising a three-stage starter-generator and a controller. The three-stage starter-generator includes a permanent magnet auxiliary exciter, a main exciter, a main motor, a resolver, and a rotating rectifier. The controller includes a voltage regulating circuit, an AC excitation power supply, a three-phase full-bridge MOSFET, a control circuit, a DC voltage sensor, a three-phase voltage sensor, generator control circuit breakers GCB1 and GCB2, and a current sensor S. F and diode D1;

[0011] The resolver output speed and position signal P is connected to the control circuit, and the permanent magnet auxiliary exciter winding W PMG Terminals A, B, and C are connected to terminals A, B, and C of the voltage regulating circuit, respectively, and the control circuit outputs a drive signal G. C Connected to a voltage regulator circuit, the output terminal V of the voltage regulator circuit Co The positive and negative terminals are respectively connected to the excitation winding W of the main exciter. EE The F+ and F- terminals are connected, and the V input terminal of the AC excitation power supply is... Bi The positive and negative terminals are connected to the positive and negative terminals of the external DC interface, respectively, and the drive signal G output by the control circuit... B Connected to an AC excitation power supply, the output terminal of the AC excitation power supply is v Bo The * and ~ terminals are respectively connected to the W excitation winding of the main exciter. EE Connect the F+ and F- terminals.

[0012] The current sensor S F Detecting the flow into the main exciter excitation winding W EE The excitation current i is output after the F+ terminal current. F Connected to the control circuit, the V of the three-phase full-bridge MOSFET Ai The positive and negative terminals of the terminal are connected to the positive and negative terminals of the external DC interface, respectively. The A, B, and C terminals of the three-phase full-bridge MOSFET are connected to the low-voltage three-phase winding W of the main motor, respectively. L The A, B, and C terminals are connected, and the control circuit outputs a drive signal G. A Connected to a three-phase full-bridge MOSFET, the three-phase AC current i output by the three-phase full-bridge MOSFET is... ABC Connected to the control circuit,

[0013] It also includes a starting power supply V s The starting power supply V sThe positive electrode is connected to the anode of diode D1, the cathode of diode D1, and the three-phase full-bridge V of the MOS transistor. Ai The positive terminal is connected to the main motor's high-voltage three-phase winding W. H Terminals A, B, and C are connected to terminals A, B, and C of a three-phase voltage sensor, respectively. The three-phase voltage sensor outputs a three-phase voltage V. H Connected to the control circuit, the positive and negative input terminals of the DC voltage sensor are respectively connected to the three-phase full-bridge V-channel MOSFET. Ai When the positive and negative terminals are connected, the DC voltage sensor outputs a DC voltage V. dc Connected to the control circuit, the control circuit outputs a drive signal G. L and G H The rotor armature winding W of the main exciter is connected to the generator control circuit breakers GCB1 and GCB2 respectively. EM The rotor excitation winding W of the rotating rectifier and the main motor ME connect.

[0014] Furthermore, the stator armature winding of the main motor includes a low-voltage three-phase winding W. L and high voltage three-phase winding W H The low-voltage three-phase winding W L W includes phases A, B, and C respectively. LA W LB and W LC The high-voltage three-phase winding W H W includes phases A, B, and C respectively. HA W HB and W HC ;

[0015] For the low-voltage three-phase winding W L Any X-phase winding, where X = A, B, or C, is formed by the 1st, 2nd…pth pole pair windings W LX1 W LX2 …W LXp Parallel connection configuration, low-voltage three-phase winding W L One end of any X-phase winding is connected to the neutral point N. L Connection, low-voltage three-phase winding W L The other end of any X-phase winding is connected to the low-voltage three-phase winding W. L The X-end connection,

[0016] For the high-voltage three-phase winding W H Any X-phase winding, where X = A, B, or C, is formed by the 1st, 2nd…pth pole pair windings W HX1 W HX2 …W HXp The high-voltage three-phase winding W is formed by sequentially connecting the windings in series. H One end of any X-phase winding is connected to the neutral point N. HConnection, high-voltage three-phase winding W H The other end of any X-phase winding is connected to the high-voltage three-phase winding W. H The X-end connection,

[0017] The low-voltage three-phase winding W L Any X-phase winding, pole pair W, 1st, 2nd...pth pole pair. LX1 W LX2 …W LXp Respectively connected to the high-voltage three-phase winding W H Any X-phase winding, pole pair W, 1st, 2nd...pth pole pair. HX1 W HX2 …W HXp The structure within the stator slot remains the same.

[0018] Furthermore, the three-phase full-bridge MOSFET includes MOSFETs Q1 to Q6, Q... 1A ~Q 6A Capacitor C A Current sensor S A S B and S C ;

[0019] The capacitor C A The two ends are respectively connected to the V of the three-phase full bridge of the MOSFET. Ai The positive and negative terminals are connected, and the V of the three-phase full-bridge MOSFET is... Ai The positive terminal of the MOSFET Q is connected to the positive terminal. 1A The source of the MOSFET Q 1A The drain of MOSFET Q1, the drain of MOSFET Q1, the source of MOSFET Q1, the drain of MOSFET Q2, the source of MOSFET Q2, and the source of MOSFET Q... 2A The source of the MOSFET Q 2A The drain of the MOSFET and the V of the three-phase full-bridge Ai The negative terminal is connected.

[0020] V of a three-phase full-bridge MOSFET Ai The positive terminal of the MOSFET Q is connected to the positive terminal. 3A The source of the MOSFET Q 3A The drain of MOSFET Q3, the drain of MOSFET Q3, the source of MOSFET Q3, the drain of MOSFET Q4, the source of MOSFET Q4, and the source of MOSFET Q4. 4A The source of the MOSFET Q 4A The drain of the MOSFET and the V of the three-phase full-bridge Ai The negative terminal is connected.

[0021] V of a three-phase full-bridge MOSFET Ai The positive terminal of the MOSFET Q is connected to the positive terminal. 5A The source of the MOSFET Q 5AThe drain of MOSFET Q5, the drain of MOSFET Q5, the source of MOSFET Q5, the drain of MOSFET Q6, the source of MOSFET Q6, and the source of MOSFET Q7. 6A The source of the MOSFET Q 6A The drain of the MOSFET and the V of the three-phase full-bridge Ai The negative terminal is connected.

[0022] The gates of MOSFETs Q1 to Q6 are connected to drive signals G1 to G6 respectively. 1A ~Q 6A The gates are respectively connected to the drive signal G 1A ~G 6A The connections are as follows: the connection point between the source and drain of MOSFET Q1 is used as terminal A of the three-phase full-bridge MOSFET; the connection point between the source and drain of MOSFET Q3 and Q4 is used as terminal B of the three-phase full-bridge MOSFET; and the connection point between the source and drain of MOSFET Q5 and Q6 is used as terminal C of the three-phase full-bridge MOSFET. Current sensor S... A S B and S C After detecting the current flowing out of the A, B, and C terminals of the three-phase full-bridge MOSFET, the output AC current i is determined. A i B and i C , by alternating current i A i B and i C Composition of three-phase alternating current i ABC .

[0023] The design method for a three-stage starter-generator system with both AC and DC outputs includes the following steps:

[0024] Step 1: Calculate the position signal θ based on the speed and position signal P output by the resolver, and make the position signal θ = 0° and synchronize it with the three-phase armature winding W of the main motor. L The zero-crossing point of the voltage drop segment of phase A under no-load conditions corresponds to the following:

[0025] Step 2: During startup, power is supplied via the starting power supply V. s Provides the electrical energy required for starting, and supplies it to the main exciter's excitation winding W via AC excitation power supply. EE Provide AC excitation current i F The current flowing through the three-phase armature winding W of the main motor is regulated by a MOS three-phase full-bridge circuit. L Three-phase alternating current i ABC This enables the three-stage starter generator to output torque, thereby starting the engine;

[0026] Step 3: During power generation, the voltage regulating circuit adjusts the flow of W through the excitation winding of the main exciter. EE excitation current i F This causes the three-phase armature windings of the main motor to...H The output three-phase AC voltage v H Stabilize at the desired voltage value;

[0027] Step 4: During power generation, the DC voltage V output by the three-phase full-bridge MOSFET is controlled by either boost or buck voltage. dc Stabilize at the desired voltage value;

[0028] Step 5: During power generation, if the low-voltage DC regulation is abnormal, then through drive signals G1~G6 and G... 1A ~G 6A Disconnect the MOSFETs, and disconnect the power transistors Q1-Q6 and Q7 in the three-phase full-bridge circuit. 1A ~Q 6A Through the driving signal G L To disconnect the power generation control circuit breaker GCB1, thereby isolating the low-voltage DC regulated fault;

[0029] Step 6: During power generation, if AC voltage regulation is abnormal, then the drive signal G will be used. L G H and G C To disconnect the power generation control circuit breakers GCB1 and GCB2 and the power generation control relay GCR in the voltage regulating circuit, thereby achieving fault protection.

[0030] Furthermore, the boost control in step 4 specifically includes the following steps:

[0031] Step 411: Based on the DC voltage V dc Given the position signal θ, determine the drive signals G1 to G6 for boost voltage regulation control. Define the falling edge of drive signal G2 corresponding to θ = 240°, and the high-level pulse width of drive signal G2 as δ1. When the DC voltage V dc When the voltage is less than the desired value, the DC voltage is stabilized at the desired output voltage by increasing the width of δ1. The adjustment range of δ1 is 0 to 90°. G1 to G6 have the same positive pulse width and are formed by sequentially delaying G2, G5, G4, G1, G6, and G3 by 60°.

[0032] Step 412: Determine signal G based on position signal θ. 1Ai ~G 6Ai When θ = 210°~360° and 0°~30°, make G 1Ai =1, for other θ values, make G 1Ai =0, press G 1Ai G 6Ai G 3Ai G 2Ai G 5Ai G 4Ai Signal G is formed by sequentially delaying by 60°. 1Ai~G 6Ai ;

[0033] Step 413: Based on drive signals G1~G6, signal G 1Ai ~G 6Ai Determine the drive signal G 1A ~G 6A G 1A =G2|G 1Ai G 6A =G5|G 6Ai G 3A =G4|G 3Ai G 2A =G1|G 2Ai G 5A =G6|G 5Ai G 4A =G3|G 4Ai ;

[0034] Step 414: Send drive signals G1 to G6 to power transistors Q1 to Q6 respectively. 1A ~G 6A Send to power transistor Q respectively 1A ~Q 6A .

[0035] Furthermore, the voltage reduction control in step 4 specifically includes the following steps:

[0036] Step 421: Set all drive signals G1 to G6 to 0, and send drive signals G1 to G6 to power transistors Q1 to Q6 respectively, so that power transistors Q1 to Q6 are all turned off;

[0037] Step 422: Determine signal G based on position signal θ. 1Ai ~G 6Ai When θ = 210°~360° and 0°~30°, make G 1Ai =1, for other θ values, make G 1Ai =0, press G 1Ai G 6Ai G 3Ai G 2Ai G 5Ai G 4Ai Signal G is formed by sequentially delaying by 60°. 1Ai ~G 6Ai ;

[0038] Step 423: Set the drive signal G 1A ~G 6A Separately delayed signals G 1Ai ~G 6Ai The angle is δ2, when the DC voltage V dcWhen the voltage exceeds the desired value, the DC voltage is stabilized at the desired value by increasing the width of δ2.

[0039] Step 424: Transfer the drive signal G 1A ~G 6A Send to power transistor Q respectively 1A ~Q 6A .

[0040] The beneficial effects of this invention are as follows:

[0041] 1. The three-stage starter generator system and design method with AC and DC dual output proposed in this invention are applicable to the field of aviation hybrid power systems consisting of 28V low-voltage DC and 115V AC.

[0042] 2. Compared to the combination of DC brushed starter generator system and AC three-stage generator system, the proposed AC and DC dual-output three-stage starter generator system has a higher power density than the combination of low-voltage DC three-stage starter generator system and AC three-stage generator system, and the combination of AC three-stage starter generator system, static converter and transformer rectifier.

[0043] 3. Compared with the combination of DC brushed generator system and AC three-stage generator system, it overcomes the shortcomings of not being suitable for high-altitude long-haul flight, export maintenance-free operation, and resistance to coastal salt spray environment.

[0044] 4. Compared to the combination of a low-voltage DC three-stage starter-generator system and an AC three-stage generator system, by combining the low-voltage DC three-stage starter-generator system and the AC three-stage generator system into a hardware-reusable AC and DC dual-output three-stage starter-generator system, the mechanical interface between the generator system and the engine is reduced from two to one. At the same time, the weight of the non-directly effective parts such as the casing, heat dissipation structure, and rotor support structure of a single generator system is much lower than the corresponding weight of the two generator systems, thus achieving a significant improvement in power density.

[0045] 5. Compared with the AC three-stage starter generator system and the combination of static converter and transformer rectifier, the static converter is eliminated. The power converter used for 28V power supply stabilization eliminates the heavy transformer in the transformer rectifier, thus achieving a significant increase in power density.

[0046] 6. The main motor uses low-voltage three-phase winding WL and low-voltage three-phase winding WH to meet the requirements of 28V low-voltage DC and 115V AC respectively.

[0047] 7. The three-phase full-bridge MOSFET has bidirectional energy flow characteristics, which can simultaneously meet the requirements of starting, inverting and power generation voltage regulation, realizing hardware multiplexing for starting and power generation.

[0048] 8. The switching frequency of the three-phase full-bridge generator voltage regulator using MOSFETs is the same as the generator output frequency. The frequency is low, and the loss is much lower than that of the traditional high-frequency voltage regulator control scheme.

[0049] 9. The switching frequency of the three-phase full-bridge generator voltage regulator using MOSFETs is the same as the generator output frequency. The frequency is relatively low, and the high-frequency conducted and radiated interference is much lower than that of the traditional high-frequency voltage regulation control scheme. The high-frequency ripple spectrum is more likely to meet the requirements of GJB181B-2012, and it also has better electromagnetic compatibility characteristics.

[0050] 10. The switching frequency used in the three-phase full-bridge MOSFET generator voltage regulator is the same as the generator output frequency, which is relatively low. Therefore, the power transistors can be high current-capable but have higher losses, giving the three-phase full-bridge MOSFET generator good overload resistance.

[0051] 11. A three-phase full-bridge MOSFET can be used for both boost and buck control. When stabilizing the voltage, the boost and buck control range is relatively narrow, and the efficiency is higher than that of a power converter with simple boost or buck control.

[0052] 12. The three-phase full-bridge MOSFET uses the inductance of the starter generator winding to achieve voltage regulation control, eliminating the need for heavy magnetic components and achieving a higher power density than conventional power converters. Attached Figure Description

[0053] Figure 1 This is a block diagram of the three-stage starter generator system with AC and DC dual outputs of the present invention.

[0054] Figure 2 This is a diagram of the dual armature windings of the main motor of the present invention;

[0055] Figure 3 This is a three-phase full-bridge circuit diagram of the MOS transistors of the present invention;

[0056] Figure 4 This is the AC excitation power supply circuit diagram for the present invention;

[0057] Figure 5 This is a circuit diagram of the voltage regulation circuit of the present invention;

[0058] Figure 6 This is a diagram showing the correspondence between the resolver output position signal and the no-load voltage WL of the three-phase armature winding of the main motor in this invention.

[0059] Figure 7 This is a schematic diagram of the MOS three-phase full-bridge starting control principle of the present invention;

[0060] Figure 8 This is a schematic diagram of the AC output voltage regulation control principle of the present invention;

[0061] Figure 9This is a schematic diagram of the DC output boost control principle of the present invention;

[0062] Figure 10 This is a schematic diagram of the DC output step-down control principle of the present invention. Detailed Implementation

[0063] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0064] The following is a further detailed description with reference to the accompanying drawings and embodiments.

[0065] Figure 1 The diagram shows a three-stage starter-generator system with both AC and DC outputs, suitable for hybrid power supplies consisting of 28V low-voltage DC and 115V AC. During startup, the 28V low-voltage battery serves as the starting power source. s .

[0066] A three-stage starter-generator system with both AC and DC dual outputs includes a three-stage starter-generator and a controller. The three-stage starter-generator includes a permanent magnet auxiliary exciter, a main exciter, a main motor, a resolver, and a rotating rectifier. The controller includes a voltage regulating circuit, an AC excitation power supply, a three-phase full-bridge MOSFET, a control circuit, a DC voltage sensor, a three-phase voltage sensor, and a current sensor. F It is connected to the control circuit via the resolver output speed and position signal P, and the permanent magnet auxiliary exciter winding W. PMG Terminals A, B, and C are connected to terminals A, B, and C of the voltage regulating circuit, respectively, and the control circuit outputs a drive signal G. C Connected to a voltage regulator circuit, the output terminal V of the voltage regulator circuit Co The positive and negative terminals are respectively connected to the excitation winding W of the main exciter. EE Connect the F+ and F- terminals, and connect the V terminal of the AC excitation power supply. Bi The positive and negative terminals are connected to the positive and negative terminals of the external DC interface, respectively, and the control circuit outputs a drive signal G. B Connect to an AC excitation power supply; the output terminal of the AC excitation power supply is V. Bo The * and ~ terminals are respectively connected to the W excitation winding of the main exciter. EE The F+ and F- terminals are connected, and the current sensor S F Detecting the flow into the main exciter excitation winding W EE The excitation current i is output after the F+ terminal current. F Connected to the control circuit, the MOSFET three-phase full-bridge V Ai The positive and negative terminals of the terminal are connected to the positive and negative terminals of the external DC interface, respectively. The A, B, and C terminals of the three-phase full-bridge MOSFET are connected to the W terminals of the low-voltage three-phase winding of the main motor, respectively. L The A, B, and C connections are connected, and the control circuit outputs a drive signal G. AWhen connected to a three-phase full-bridge MOSFET, the three-phase full-bridge MOSFET outputs a three-phase AC current i. ABC Connected to the control circuit, starting power supply V s The positive electrode is connected to the anode of diode D1, the cathode of diode D1, and the three-phase full-bridge V of MOSFET. Ai The positive terminal is connected to the main motor high-voltage three-phase winding W. H Terminals A, B, and C are connected to terminals A, B, and C of a three-phase voltage sensor, respectively. The three-phase voltage sensor outputs a three-phase voltage V. H Connected to the control circuit, the positive and negative input terminals of the DC voltage sensor are respectively connected to the three-phase full-bridge V-channel MOSFET. Ai When the positive and negative terminals are connected, the DC voltage sensor outputs a DC voltage V. dc Connected to the control circuit, the control circuit outputs a drive signal G. L and G H The main exciter rotor armature winding W is connected to the generator control circuit breakers GCB1 and GCB2 respectively. EM via the rotating rectifier and the main motor rotor excitation winding W ME Connection constitutes.

[0067] Since the proposed three-stage starter generator with both AC and DC outputs does not employ mechanical commutation, it overcomes the shortcomings of combining a DC brushed starter generator system with an AC three-stage generator system, compared to the latter. It is not suitable for high-altitude long-haul flights, requires no maintenance for export, and is resistant to coastal salt spray environments.

[0068] Compared to the combination of a low-voltage DC three-stage starter-generator system and an AC three-stage generator system, by combining the low-voltage DC three-stage starter-generator system and the AC three-stage generator system into a hardware-reusable AC and DC dual-output three-stage starter-generator system, the mechanical interface between the generator system and the engine is reduced from two to one. At the same time, the weight of the non-directly effective parts of a single generator system, such as the casing, heat dissipation structure, and rotor support structure, is much lower than the corresponding weight of the two generator systems, resulting in a significant increase in power density.

[0069] Figure 2 The diagram shows the dual armature windings of the main motor. The main motor's stator armature windings include a low-voltage three-phase winding W. L and high voltage three-phase winding W H Low-voltage three-phase winding W L W includes phases A, B, and C respectively. LA W LB and W LC High-voltage three-phase winding W H W includes phases A, B, and C respectively. HA W HB and W HCFor low-voltage three-phase winding W L Any X-phase winding, where X = A, B, or C, is formed by the 1st, 2nd…pth pole pair windings W LX1 W LX2 …W LXp Parallel connection configuration, low-voltage three-phase winding W L One end of any X-phase winding is connected to the neutral point N. L Connection, low-voltage three-phase winding W L The other end of any X-phase winding is connected to the low-voltage three-phase winding W. L The X-terminal connection is used for the high-voltage three-phase winding W. H Any X-phase winding, where X = A, B, or C, is formed by the 1st, 2nd…pth pole pair windings W HX1 W HX2 …W HXp The high-voltage three-phase winding W is formed by sequentially connecting the windings in series. H One end of any X-phase winding is connected to the neutral point N. H Connection, high-voltage three-phase winding W H The other end of any X-phase winding is connected to the high-voltage three-phase winding W. H The X-terminal connection, low-voltage three-phase winding W L Any X-phase winding, pole pair W, 1st, 2nd...pth pole pair. LX1 W LX2 …W LXp Respectively connected to the high-voltage three-phase winding W H Any X-phase winding, pole pair W, 1st, 2nd...pth pole pair. HX1 W HX2 …W HXp The structure within the stator slot remains the same.

[0070] First, the low-voltage three-phase winding W is achieved by connecting the first, second...p pole pairs of windings in parallel or series. L Or high-voltage three-phase winding W H Voltage regulation, and then by adjusting the winding turns ratio N W Adjustments are made to achieve low-voltage three-phase winding W L Or high-voltage three-phase winding W H Voltage regulation, winding turns ratio N W =W HX1 / W LX1 =W HX2 / W LX2 …=W HXp / W LXp In this embodiment, the number of pole pairs of the main motor is p=3, and the winding turns ratio is selected as N. W =2.

[0071] Under no-load conditions, when the low-voltage three-phase winding W L When the voltage after natural rectification is 28V, it needs to be rectified by the winding turns ratio N. WDesigned to ensure high-voltage three-phase winding W H The effective value of the phase voltage is less than 115V. The purpose of this design is to ensure that the low-voltage three-phase winding W... L During start-up control, prevent the high-voltage three-phase winding W H The voltage induced above the rated value may cause potential malfunctions.

[0072] The main motor uses low-voltage three-phase winding W L and low-voltage three-phase winding W H To meet the requirements of 28V low-voltage DC and 115V AC respectively.

[0073] Figure 3 The diagram shown is a three-phase full-bridge circuit with MOSFETs. The three-phase full-bridge circuit with MOSFETs includes MOSFETs Q1 to Q6, Q... 1A ~Q 6A Capacitor C A Current sensor S A S B and S C It is caused by capacitor C A The two ends are respectively connected to V Ai The positive and negative terminals are connected, V Ai Positive pole Q 1A The source, Q 1A Drain of Q1, drain of Q1, source of Q1, drain of Q2, source of Q2, Q 2A The source, Q 2A The drain and V Ai The negative terminal connection, V Ai Positive pole Q 3A The source, Q 3A Drain of Q3, drain of Q3, source of Q3, drain of Q4, source of Q4, Q 4A The source, Q 4A The drain and V Ai The negative terminal connection, V Ai Positive pole Q 5A The source, Q 5A Drain of Q5, drain of Q5, source of Q5, drain of Q6, source of Q6, Q 6A The source, Q 6A The drain and V Ai The negative terminal of Q1 is connected, and the gates of Q1 to Q6 are respectively connected to drive signals G1 to G6. 1A ~Q 6A The gates are respectively connected to the drive signal G 1A ~G 6AThe connections are as follows: the connection point between the source of Q1 and the drain of Q2 serves as terminal A of the three-phase full-bridge MOSFET; the connection point between the source of Q3 and the drain of Q4 serves as terminal B of the three-phase full-bridge MOSFET; and the connection point between the source of Q5 and the drain of Q6 serves as terminal C of the three-phase full-bridge MOSFET. Current sensor S... A S B and S C After detecting the current flowing out of the A, B, and C terminals of the three-phase full-bridge MOSFET, the output AC current i is determined. A i B and i C , by alternating current i A i B and i C Composition of three-phase alternating current i ABC .

[0074] Compared to the AC three-stage starter generator system, the combination of static converter and transformer rectifier, the static converter is eliminated, and the MOSFET three-phase full-bridge used for 28V power supply stabilization eliminates the need for the heavy transformer in the transformer rectifier, thus achieving a significant increase in power density.

[0075] Figure 4 The diagram shows the AC excitation power supply circuit. The 28V input is achieved through boost DC / DC modules 1, 2…n. Bi Converted to 270V SI Power is increased by connecting multiple boost DC / DC modules in parallel. This is achieved through the drive signal S. B The start control relay SCR is controlled by Q B1 ~Q B4 The single-phase inverter bridge and the main exciter excitation winding W constitute EE Connect or disconnect, in drive signal G B Under the control of Q B1 ~Q B4 The single-phase inverter bridge formed will convert DC V SI Converted to AC, regulating the flow of W through the main exciter's excitation winding during startup. EE excitation current i F .

[0076] Figure 5 The diagram shows the circuit diagram of the voltage regulation circuit, which is driven by the signal S. C The generator control relay GCR is used to connect the voltage regulating circuit with the main exciter excitation winding W. EE Connecting or disconnecting is controlled by diode D. C1 ~D C6 The three-phase rectifier bridge is used to convert the three-phase AC voltage V provided by the permanent magnet exciter into voltage V. PMG Convert to DC V G When generating electricity, Q C2Closed, by adjusting Q C1 The duty cycle is used to adjust the flow through the main exciter's excitation winding W. EE excitation current i F .

[0077] The design method for a three-stage start-up and generation system with both AC and DC outputs includes the following steps:

[0078] Step 1: Calculate the position signal θ based on the speed and position signal P output by the resolver, and make the position signal θ = 0° and synchronize it with the three-phase armature winding W of the main motor. L The zero-crossing point of the voltage drop segment of phase A under no-load conditions corresponds to the following:

[0079] Step 2: During startup, power is supplied via the starting power supply V. s Provides the electrical energy required for starting, and supplies it to the main exciter's excitation winding W via AC excitation power supply. EE Provide AC excitation current i F The current flowing through the three-phase armature winding W of the main motor is regulated by a MOS three-phase full-bridge circuit. L Three-phase alternating current i ABC This enables the three-stage starter generator to output torque, thereby starting the engine;

[0080] Step 3: During power generation, the voltage regulating circuit adjusts the flow of W through the excitation winding of the main exciter. EE excitation current i F This causes the three-phase armature windings of the main motor to... H The output three-phase AC voltage v H Stabilize at the desired voltage value;

[0081] Step 4: During power generation, the DC voltage V output by the three-phase full-bridge MOSFET is controlled by either boost or buck voltage. dc Stabilize at the desired voltage value;

[0082] Step 5: During power generation, if a low-voltage DC voltage regulation abnormality is detected, then drive signals G1~G6 and G... 1A ~G 6A Disconnect the MOSFETs, and disconnect the power transistors Q1-Q6 and Q7 in the three-phase full-bridge circuit. 1A ~Q 6A Through the driving signal G L To disconnect the power generation control circuit breaker GCB1, thereby isolating the low-voltage DC regulated fault;

[0083] Step 6: During power generation, if an AC voltage stabilization abnormality is detected, the drive signal G will be used. L G H and G C To disconnect the power generation control circuit breakers GCB1 and GCB2 and the power generation control relay GCR in the voltage regulating circuit, thereby achieving fault protection.

[0084] Since the 115V AC voltage is stabilized by adjusting the excitation current in step 3, the three-phase armature winding W of the main motor L The rectified voltage is usually not the desired 28V, so the auxiliary method in step 4 is needed to achieve 28V low-voltage DC regulation.

[0085] Combination Figure 6 The resolver output position signal θ and the three-phase armature winding W of the main motor are shown. L The diagram showing the no-load voltage correspondence further illustrates step A. L_A v L_B and v L_C These represent the three-phase armature windings W of the main motor. L The no-load output voltages of phases A, B, and C. In step A, the position signal θ = 0° is set to the no-load voltage. L_A The zero-crossing point of the descent phase is ensured by adjusting the relative position of the resolver rotor and the main motor rotor.

[0086] Figure 7 The diagram shown below illustrates the starting control principle of a MOS three-phase full-bridge circuit, further explaining step 2. During startup, a drive signal G is generated by the control circuit. 1A ~G 6A To keep the power transistor Q closed 1A ~Q 6A A quasi-speed loop is used to adjust the q-axis current reference value i according to the speed change. q * The active current i is adjusted through a current loop. q and reactive current i d The drive signals G1 to G6 of the three-phase full-bridge MOSFETs are generated by space vector pulse width modulation (SVPWM), thereby regulating the flow of W through the three-phase armature windings of the main motor. L The current ultimately achieves starting torque regulation.

[0087] Combination Figure 8 The diagram shown further illustrates step 3 using the AC output voltage regulation control principle. This is based on the three-phase armature winding W of the main motor. H Three-phase voltage v H The AC effective value is calculated using the phase effective value. Based on the voltage regulator reference value V... ref Based on the effective value of the feedback phase, voltage loop calculation is performed to generate the reference signal I for the excitation current loop. ref According to the reference signal I of the excitation current loop. ref and excitation current i F Perform excitation current loop calculations to make the excitation current i F Reference signal I of the excitation current loop ref equal.

[0088] Combination Figure 9 The diagram shown illustrates the boost control principle for the DC output, further explaining the boost control described in step 4. The boost control in step 4 includes the following steps:

[0089] Step 411: Based on the DC voltage V dc Given the position signal θ, determine the drive signals G1 to G6 for boost voltage regulation control. Define the falling edge of drive signal G2 corresponding to θ = 240°, and the high-level pulse width of drive signal G2 as δ1. When the DC voltage V dc When the voltage is less than the desired value, the DC voltage is stabilized at the desired output voltage by increasing the width of δ1. The adjustment range of δ1 is 0 to 90°. G1 to G6 have the same positive pulse width and are generated by lag of G2, G5, G4, G1, G6 and G3 by 60°.

[0090] Step 412: Determine signal G based on position signal θ. 1Ai ~G 6Ai When θ = 210°~360° and 0°~30°, make G 1Ai =1, for other θ values, make G 1Ai =0, press G 1Ai G 6Ai G 3Ai G 2Ai G 5Ai G 4Ai Signal G is formed by sequentially delaying by 60°. 1Ai ~G 6Ai ;

[0091] Step 413: Based on drive signals G1~G6, signal G 1Ai ~G 6Ai Determine the drive signal G 1A ~G 6A G 1A =G2|G 1Ai G 6A =G5|G 6Ai G 3A =G4|G 3Ai G 2A =G1|G 2Ai G 5A =G6|G 5Ai G 4A =G3|G 4Ai ;

[0092] Step 414: Send drive signals G1 to G6 to power transistors Q1 to Q6 respectively. 1A ~G 6A They are respectively sent to power transistor Q 1A ~Q6A .

[0093] Combination Figure 10 The diagram shown illustrates the buck control principle for the DC output, further explaining the buck control described in step D. The buck control described in step D includes the following steps:

[0094] Step 421: Set all drive signals G1 to G6 to 0, and send drive signals G1 to G6 to power transistors Q1 to Q6 respectively, so that power transistors Q1 to Q6 are all turned off;

[0095] Step 422: Determine signal G based on position signal θ. 1Ai ~G 6Ai When θ = 210°~360° and 0°~30°, make G 1Ai =1, for other θ values, make G 1Ai =0, press G 1Ai G 6Ai G 3Ai G 2Ai G 5Ai G 4Ai Signal G is formed by sequentially delaying by 60°. 1Ai ~G 6Ai ;

[0096] Step 423: Set the drive signal G 1A ~G 6A Separately delayed signals G 1Ai ~G 6Ai The angle is δ2, when the DC voltage V dc When the voltage exceeds the desired value, the DC voltage is stabilized at the desired value by increasing the width of δ2.

[0097] Step 424: Transfer the drive signal G 1A ~G 6A They are respectively sent to power transistor Q 1A ~Q 6A .

[0098] The hardware and control method design of a three-phase full-bridge MOSFET has the following advantages:

[0099] 1. The three-phase full-bridge MOSFET has bidirectional energy flow characteristics, which can simultaneously meet the requirements of starting, inverting and power generation voltage regulation, realizing hardware multiplexing for starting and power generation;

[0100] 2. The switching frequency of the three-phase full-bridge generator voltage regulator using MOSFETs is the same as the generator output frequency. The frequency is low, and the loss is much lower than that of the traditional high-frequency voltage regulator control scheme.

[0101] 3. The switching frequency of the three-phase full-bridge generator voltage regulator using MOSFETs is the same as the generator output frequency. The frequency is low, and the high-frequency conducted and radiated interference is much lower than that of the traditional high-frequency voltage regulation control scheme. The high-frequency ripple spectrum is more likely to meet the requirements of GJB181B-2012, and it also has better electromagnetic compatibility characteristics.

[0102] 4. The switching frequency used in the three-phase full-bridge MOSFET generator voltage regulator is the same as the generator output frequency, which is relatively low. Therefore, the power transistors can be high current-capable but have higher losses, giving the three-phase full-bridge MOSFET generator good overload resistance.

[0103] 5. A three-phase full-bridge MOSFET can be used for both boost and buck control. When regulating voltage, the boost and buck control range is relatively narrow, and the efficiency is higher than that of a power converter with simple boost or buck control.

[0104] 6. The three-phase full-bridge MOSFET uses the inductance of the starter generator winding to achieve voltage regulation control, eliminating the need for heavy magnetic components and achieving a higher power density than conventional power converters.

[0105] Compared to the combination of a DC brushed starter generator system and an AC three-stage generator system, the proposed AC and DC dual-output three-stage starter generator system has a higher power density than the combination of a low-voltage DC three-stage starter generator system and an AC three-stage starter generator system, a static converter, and a transformer rectifier.

Claims

1. A three-stage starter-generator system with both AC and DC outputs, characterized in that: The system includes a three-stage starter generator and a controller. The three-stage starter generator comprises a permanent magnet auxiliary exciter, a main exciter, a main motor, a resolver, and a rotating rectifier. The controller includes a voltage regulating circuit, an AC excitation power supply, a three-phase full-bridge MOSFET circuit, a control circuit, a DC voltage sensor, a three-phase voltage sensor, generator control circuit breakers GCB1 and GCB2, and a current sensor S. F and diode D1; The resolver output speed and position signal P is connected to the control circuit, and the permanent magnet auxiliary exciter winding W PMG Terminals A, B, and C are connected to terminals A, B, and C of the voltage regulating circuit, respectively, and the control circuit outputs a drive signal G. C Connected to a voltage regulator circuit, the output terminal V of the voltage regulator circuit Co The positive and negative terminals are respectively connected to the excitation winding W of the main exciter. EE The F+ and F- terminals are connected, and the V input terminal of the AC excitation power supply is... Bi The positive and negative terminals are connected to the positive and negative terminals of the external DC interface, respectively, and the drive signal G output by the control circuit... B Connected to an AC excitation power supply, the output terminal of the AC excitation power supply is v Bo The * and ~ terminals are respectively connected to the W excitation winding of the main exciter. EE Connect the F+ and F- terminals. The current sensor S F Detecting the flow into the main exciter excitation winding W EE The excitation current i is output after the F+ terminal current. F Connected to the control circuit, the V of the three-phase full-bridge MOSFET Ai The positive and negative terminals of the terminal are connected to the positive and negative terminals of the external DC interface, respectively. The A, B, and C terminals of the three-phase full-bridge MOSFET are connected to the low-voltage three-phase winding W of the main motor, respectively. L The A, B, and C terminals are connected, and the control circuit outputs a drive signal G. A Connected to a three-phase full-bridge MOSFET, the three-phase AC current i output by the three-phase full-bridge MOSFET is... ABC Connected to the control circuit, It also includes a starting power supply V s The starting power supply V s The positive electrode is connected to the anode of diode D1, the cathode of diode D1, and the three-phase full-bridge V of the MOS transistor. Ai The positive terminal is connected to the main motor's high-voltage three-phase winding W. H Terminals A, B, and C are connected to terminals A, B, and C of a three-phase voltage sensor, respectively. The three-phase voltage sensor outputs a three-phase voltage V. H Connected to the control circuit, the positive and negative input terminals of the DC voltage sensor are respectively connected to the three-phase full-bridge V-channel MOSFET. Ai When the positive and negative terminals are connected, the DC voltage sensor outputs a DC voltage V. dc Connected to the control circuit, the control circuit outputs a drive signal G. L and G H The rotor armature winding W of the main exciter is connected to the generator control circuit breakers GCB1 and GCB2 respectively. EM The rotor excitation winding W of the rotating rectifier and the main motor ME connect.

2. The three-stage starter-generator system and design method with AC and DC dual outputs as described in claim 1, characterized in that: The stator armature winding of the main motor includes a low-voltage three-phase winding W. L and high voltage three-phase winding W H The low-voltage three-phase winding W L W includes phases A, B, and C respectively. LA W LB and W LC The high-voltage three-phase winding W H W includes phases A, B, and C respectively. HA W HB and W HC ; For the low-voltage three-phase winding W L Any X-phase winding, where X = A, B, or C, is formed by the 1st, 2nd…pth pole pair windings W LX1 W LX2 …W LXp Parallel connection configuration, low-voltage three-phase winding W L One end of any X-phase winding is connected to the neutral point N. L Connection, low-voltage three-phase winding W L The other end of any X-phase winding is connected to the low-voltage three-phase winding W. L The X-end connection, For the high-voltage three-phase winding W H Any X-phase winding, where X = A, B, or C, is formed by the 1st, 2nd…pth pole pair windings W HX1 W HX2 …W HXp The high-voltage three-phase winding W is formed by sequentially connecting the windings in series. H One end of any X-phase winding is connected to the neutral point N. H Connection, high-voltage three-phase winding W H The other end of any X-phase winding is connected to the high-voltage three-phase winding W. H The X-end connection, The low-voltage three-phase winding W L Any X-phase winding, pole pair W, 1st, 2nd...pth pole pair. LX1 W LX2 …W LXp Respectively connected to the high-voltage three-phase winding W H Any X-phase winding, pole pair W, 1st, 2nd...pth pole pair. HX1 W HX2 …W HXp The structure within the stator slot remains the same.

3. The three-stage starter-generator system and design method with AC and DC dual outputs as described in claim 2, characterized in that: The three-phase full-bridge MOSFET includes MOSFETs Q1 to Q6, Q... 1A ~Q 6A Capacitor C A Current sensor S A S B and S C ; The capacitor C A The two ends are respectively connected to the V of the three-phase full bridge of the MOSFET. Ai The positive and negative terminals are connected, and the V of the three-phase full-bridge MOSFET is... Ai The positive terminal of the MOSFET Q is connected to the positive terminal. 1A The source of the MOSFET Q 1A The drain of MOSFET Q1, the drain of MOSFET Q1, the source of MOSFET Q1, the drain of MOSFET Q2, the source of MOSFET Q2, and the source of MOSFET Q... 2A The source of the MOSFET Q 2A The drain of the MOSFET and the V of the three-phase full-bridge Ai The negative terminal is connected. V of a three-phase full-bridge MOSFET Ai The positive terminal of the MOSFET Q is connected to the positive terminal. 3A The source of the MOSFET Q 3A The drain of MOSFET Q3, the drain of MOSFET Q3, the source of MOSFET Q3, the drain of MOSFET Q4, the source of MOSFET Q4, and the source of MOSFET Q4. 4A The source of the MOSFET Q 4A The drain of the MOSFET and the V of the three-phase full-bridge Ai The negative terminal is connected. V of a three-phase full-bridge MOSFET Ai The positive terminal of the MOSFET Q is connected to the positive terminal. 5A The source of the MOSFET Q 5A The drain of MOSFET Q5, the drain of MOSFET Q5, the source of MOSFET Q5, the drain of MOSFET Q6, the source of MOSFET Q6, and the source of MOSFET Q7. 6A The source of the MOSFET Q 6A The drain of the MOSFET and the V of the three-phase full-bridge Ai The negative terminal is connected. The gates of MOSFETs Q1 to Q6 are connected to drive signals G1 to G6 respectively. 1A ~Q 6A The gates are respectively connected to the drive signal G 1A ~G 6A The connections are as follows: the connection point between the source and drain of MOSFET Q1 is used as terminal A of the three-phase full-bridge MOSFET; the connection point between the source and drain of MOSFET Q3 and Q4 is used as terminal B of the three-phase full-bridge MOSFET; and the connection point between the source and drain of MOSFET Q5 and Q6 is used as terminal C of the three-phase full-bridge MOSFET. Current sensor S... A S B and S C After detecting the current flowing out of the A, B, and C terminals of the three-phase full-bridge MOSFET, the output AC current i is determined. A i B and i C , by alternating current i A i B and i C Composition of three-phase alternating current i ABC .

4. The design method of the three-stage starter-generator system with AC and DC dual output as described in claim 3, characterized in that... Includes the following steps: Step 1: Calculate the position signal θ based on the speed and position signal P output by the resolver, and make the position signal θ = 0° and synchronize it with the three-phase armature winding W of the main motor. L The zero-crossing point of the voltage drop segment of phase A under no-load conditions corresponds to the following: Step 2: During startup, power is supplied via the starting power supply V. s Provides the electrical energy required for starting, and supplies it to the main exciter's excitation winding W via AC excitation power supply. EE Provide AC excitation current i F The current flowing through the three-phase armature winding W of the main motor is regulated by a MOS three-phase full-bridge circuit. L Three-phase alternating current i ABC This enables the three-stage starter generator to output torque, thereby starting the engine; Step 3: During power generation, the voltage regulating circuit adjusts the flow of W through the main exciter's excitation winding. EE excitation current i F This causes the three-phase armature windings of the main motor to... H The output three-phase AC voltage v H Stabilize at the desired voltage value; Step 4: During power generation, the DC voltage V output by the three-phase full-bridge MOSFET is controlled by either boost or buck voltage. dc Stabilize at the desired voltage value; Step 5: During power generation, if the low-voltage DC regulation is abnormal, then through drive signals G1~G6 and G... 1A ~G 6A Disconnect the MOSFETs, and disconnect the power transistors Q1-Q6 and Q7 in the three-phase full-bridge circuit. 1A ~Q 6A Through the driving signal G L To disconnect the generator control circuit breaker GCB1 and achieve low-voltage DC voltage regulation fault isolation; Step 6: During power generation, if AC voltage regulation is abnormal, then the drive signal G will be used. L G H and G C To disconnect the power generation control circuit breakers GCB1 and GCB2 and the power generation control relay GCR in the voltage regulating circuit, thereby achieving fault protection.

5. The design method of the three-stage starter-generator system with AC and DC dual output as described in claim 4, characterized in that, The boost control in step 4 specifically includes the following steps: Step 411: Based on the DC voltage V dc Given the position signal θ, determine the drive signals G1 to G6 for boost voltage regulation control. Define the falling edge of drive signal G2 corresponding to θ = 240°, and the high-level pulse width of drive signal G2 as δ1. When the DC voltage V dc When the voltage is less than the desired value, the DC voltage is stabilized at the desired output voltage by increasing the width of δ1. G1 to G6 have the same positive pulse width and are generated by lag of G2, G5, G4, G1, G6 and G3 by 60°. Step 412: Determine signal G based on position signal θ. 1Ai ~G 6Ai When θ = 210°~360° and 0°~30°, make G 1Ai =1, for other θ values, make G 1Ai =0, press G 1Ai G 6Ai G 3Ai G 2Ai G 5Ai G 4Ai Signal G is formed by sequentially delaying by 60°. 1Ai ~G 6Ai ; Step 413: Based on drive signals G1~G6, signal G 1Ai ~G 6Ai Determine the drive signal G 1A ~G 6A G 1A =G2|G 1Ai G 6A =G5|G 6Ai G 3A =G4|G 3Ai G 2A =G1|G 2Ai G 5A =G6|G 5Ai G 4A =G3|G 4Ai ; Step 414: Send drive signals G1 to G6 to power transistors Q1 to Q6 respectively. 1A ~G 6A Send to power transistor Q respectively 1A ~Q 6A .

6. The design method of the three-stage starter-generator system with AC and DC dual output as described in claim 4, characterized in that, The voltage reduction control in step 4 specifically includes the following steps: Step 421: Set all drive signals G1 to G6 to 0, and send drive signals G1 to G6 to power transistors Q1 to Q6 respectively, so that power transistors Q1 to Q6 are all turned off; Step 422: Determine signal G based on position signal θ. 1Ai ~G 6Ai When θ = 210°~360° and 0°~30°, make G 1Ai =1, for other θ values, make G 1Ai =0, press G 1Ai G 6Ai G 3Ai G 2Ai G 5Ai G 4Ai Signal G is formed by sequentially delaying by 60°. 1Ai ~G 6Ai ; Step 423: Set the drive signal G 1A ~G 6A Separately delayed signals G 1Ai ~G 6Ai The angle is δ2, when the DC voltage V dc When the voltage exceeds the desired value, the DC voltage is stabilized at the desired value by increasing the width of δ2. Step 424: Transfer the drive signal G 1A ~G 6A Send to power transistor Q respectively 1A ~Q 6A .

7. The design method of the three-stage starter-generator system with AC and DC dual output as described in claim 5, characterized in that: The adjustment range of δ1 is 0 to 90°.

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