270V aircraft ground high-voltage direct-current static conversion power supply

Abstract

The utility model discloses a 270V airplane ground high-voltage direct-current static conversion power supply, which belongs to the technical field of airplane ground power supplies and comprises a three-phase input end, a filter module, a phase-shifting transformer module, a first rectifier module, a full-bridge module, a transformer module, a second rectifier module and a power supply output end which are sequentially connected. The first rectification module comprises a first rectification circuit and a second rectification circuit, a first output end of the phase-shifting transformer module is electrically connected with the first rectification circuit, and a second output end of the phase-shifting transformer module is electrically connected with the second rectification circuit; and the first rectifying circuit and the second rectifying circuit are connected in parallel and are electrically connected with the full-bridge module. Three-phase power is input into the AC-DC rectifier and passes through the cooperation of input high-frequency filtering, a phase-shifting transformer, 12-pulse rectification and filtering, which means that the distortion of input current and the distortion lt of the input current are almost avoided; and the input power factor can reach 0.98, and an advanced ZVZCS soft switching technology is adopted in the DC-DC converter, so that the working efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft ground power supply, and in particular relates to a 270V aircraft ground high voltage DC static variable power supply. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] More electric and all-electric aircraft are the development trend of future aircraft. The development of aircraft high-voltage DC power supply system has created conditions for the unification of aircraft secondary energy and promoted the development of more electric and all-electric aircraft. The main power supply of the high-voltage DC power supply is composed of a high-voltage brushless DC generator and its controller. It is easy to connect in parallel, easy to achieve uninterrupted power supply and redundant power supply, and has the advantages of light weight and high efficiency. The aircraft engine directly drives the brushless AC generator to output variable frequency AC power, which is rectified to obtain DC power and is supplied to the electrical equipment through two bus bars, one of which directly provides 270V high-voltage DC power, and the other provides 115V constant frequency AC power after conversion by the inverter.

[0004] Existing aviation DC power supplies, such as the "A Aviation DC Power Supply" disclosed in patent CN201320667009.9, use 220V, 50HZ single-phase mains input, and after single-phase bridge rectification, the DC bus voltage after LC filtering passes through a half-bridge converter, and the bridge rectification outputs 270V DC. The AC-DC part is a bridge uncontrolled rectifier, which has the disadvantage of a relatively low input power factor. At the same time, at rated power, compared with the full-bridge topology, the half-bridge converter requires more transformer windings and a larger inverter current capacity, making it difficult to achieve high-power applications. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model provides a 270V aircraft ground high voltage DC static power supply, which greatly improves the performance of the 270V aircraft ground DC static power supply.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A 270V aircraft ground high voltage DC static variable power supply, comprising a three-phase input terminal, a filter module, a phase shift transformer module, a first rectifier module, a full bridge module, a transformer module, a second rectifier module and a power output terminal connected in sequence;

[0008] The first rectifier module includes a first rectifier circuit and a second rectifier circuit, the first output end of the phase-shifting transformer module is electrically connected to the first rectifier circuit, and the second output end of the phase-shifting transformer module is electrically connected to the second rectifier circuit; the first rectifier circuit and the second rectifier circuit are connected in parallel and electrically connected to the full-bridge module;

[0009] The first rectifying circuit includes a first rectifying branch, a second rectifying branch and a third rectifying branch connected in parallel, and the second rectifying circuit includes a fourth rectifying branch, a fifth rectifying branch and a sixth rectifying branch connected in parallel.

[0010] According to a further technical solution, the filtering module is a high-frequency filter composed of a first inductor and a first capacitor, a second capacitor and a third capacitor connected in parallel. The first end of the first inductor is connected to the A-phase input terminal, and the other end is connected in series with the first capacitor and grounded. The second end of the first inductor is connected to the B-phase input terminal, and the other end is connected in series with the second capacitor and grounded. The third end of the first inductor is connected to the C-phase input terminal, and the other end is connected in series with the third capacitor and grounded. The non-grounded ends of the first capacitor, the second capacitor and the third capacitor are electrically connected to the input terminal of the phase-shifting transformer module.

[0011] According to a further technical solution, the phase-shifting transformer module adopts a phase-shifting transformer.

[0012] A further technical solution is that the first rectifying branch includes a first rectifying diode and a second rectifying diode connected in series, and the first rectifying diode and the second rectifying diode are connected to the first end of the first output end of the phase-shifting transformer module; the second rectifying branch includes a third rectifying diode and a fourth rectifying diode connected in series, and the third rectifying diode and the fourth rectifying diode are connected to the second end of the first output end of the phase-shifting transformer module; the third rectifying branch includes a fifth rectifying diode and a sixth rectifying diode connected in series, and the fifth rectifying diode and the sixth rectifying diode are connected to the third end of the first output end of the phase-shifting transformer module.

[0013] A further technical solution is that the fourth rectifying branch includes a seventh rectifying diode and an eighth rectifying diode connected in series, and the seventh rectifying diode and the eighth rectifying diode are connected to the first end of the second output end of the phase-shifting transformer module; the fifth rectifying branch includes a ninth rectifying diode and a tenth rectifying diode connected in series, and the ninth rectifying diode and the tenth rectifying diode are connected to the second end of the second output end of the phase-shifting transformer module; the sixth rectifying branch includes an eleventh rectifying diode and a twelfth rectifying diode connected in series, and the eleventh rectifying diode and the twelfth rectifying diode are connected to the third end of the second output end of the phase-shifting transformer module.

[0014] According to a further technical solution, the full-bridge module includes a first switch branch and a second switch branch connected in parallel therewith.

[0015] According to a further technical solution, the first switch branch includes a first switch device and a second switch device connected in series, and the first switch device and the second switch device are connected to one end of the primary winding of the transformer module; the second switch branch includes a third switch device and a fourth switch device connected in series, and the third switch device and the fourth switch device are connected to the other end of the primary winding of the transformer module.

[0016] According to a further technical solution, the first switch device, the second switch device, the third switch device and the fourth switch device all adopt insulated gate bipolar transistors.

[0017] According to a further technical solution, the second rectifier module includes a third switch branch and a fourth switch branch connected in parallel therewith.

[0018] In a further technical solution, the third switch branch includes a first diode and a second diode connected in series, the first diode and the second diode are connected to one end of the secondary winding of the transformer module, and the fourth switch branch includes a third diode and a fourth diode connected in series, the third diode and the fourth diode are connected to the other end of the secondary winding of the transformer module.

[0019] Beneficial effects of the utility model:

[0020] The utility model uses the input three-phase power in the AC-DC rectifier through input high-frequency filtering, phase-shifting transformer, 12-pulse rectification and filtering, which means that there is almost no input current distortion, the input current distortion is less than 10%, and the input power factor can reach 0.98. And the phase-shifting transformer of the 12-pulse rectification uses an autotransformer, which can greatly reduce the volume and improve the efficiency. Compared with PWM rectification, it has the highest reliability.

[0021] The utility model utilizes twelve-pulse rectification and filtering technology to obtain a very smooth bus voltage, and at the same time, the input current distortion is low, the power factor is high, and the pollution to the power grid is small.

[0022] The utility model adopts advanced ZVZCS soft switching technology in the DC-DC converter, and cooperates with the full-bridge soft switching topology of ZVZCS with a resonant circuit to realize the full range of leading and lagging bridge arms to meet the IGBT working in zero current or zero voltage state. Due to the zero voltage and zero current switching state, the switching loss of the device is almost zero, and the high-frequency transformer adopts a nano-amorphous magnetic core, and the high-frequency iron loss is the lowest in high-power applications, thereby making the working efficiency higher. And due to the low heat dissipation requirements and IGBT buffer-free operation, the size and weight of the DCDC converter are further reduced, thereby obtaining a high power density.

[0023] The utility model improves the reliability of the DC power supply because the power device has the minimum switching stress during soft switching; and greatly reduces the electromagnetic interference (EMI) due to the lower dv / dt resonant voltage pulse; and because the operating frequency is greater than 20KHZ, the noise is very small. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0025] Figure 1 A circuit diagram of a power supply according to an embodiment of the utility model;

[0026] Figure 2 Schematic diagram of limited bipolar control of the full-bridge module in the power supply of the embodiment of the utility model.

[0027] Among them, L1-first inductor, C1-first capacitor, C2-second capacitor, C3-third capacitor, T1-phase shifting transformer, S1-first rectifier diode, S2-second rectifier diode, S3-third rectifier diode, S4-fourth rectifier diode, S5-fifth rectifier diode, S6-sixth rectifier diode, S7-seventh rectifier diode, S8-eighth rectifier diode, S9-ninth rectifier diode, S10-tenth rectifier diode, S11-eleventh rectifier diode, S12-twelfth rectifier diode, R1-first resistor, R2-second resistor, C4-fourth capacitor, C5-fifth capacitor, Q1-first switching device, Q2-second switching device, Q3-third switching device, Q4-fourth switching device, C6-sixth capacitor, C7-seventh capacitor, L2-second inductor, C8-eighth capacitor, N1-primary winding, N2-secondary winding, T2-transformer module, G1-first diode, G2-second diode, G3-third diode, G4-fourth diode, L3-third inductor, C9-ninth capacitor. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] See also Figure 1 As shown, the embodiment of the utility model provides a 270V aircraft ground high voltage DC static variable power supply, including a three-phase input terminal, a filter module, a phase shift transformer module, a first rectifier module, a full bridge module, a transformer module, a second rectifier module and a power output terminal connected in sequence;

[0030] The first rectifier module includes two sets of three-phase bridge uncontrolled rectifier circuits connected in parallel, which are composed of twelve rectifier diodes, and the rectifier diodes are all arranged in the same direction.

[0031] The 270V aircraft ground high-voltage DC static power supply consists of two parts, namely the AC-DC part and the DC-DC part. The AC-DC part adopts a rectifier of a 12-pulse three-phase passive PFC circuit based on a phase-shifting autotransformer with input inductance, including a filter module, a phase-shifting transformer module and a first rectifier module connected in sequence; the DC-DC part adopts a DCDC converter with advanced ZVZCS soft switching technology, including a full-bridge module, a transformer module and a second rectifier module connected in sequence.

[0032] In this embodiment, if Figure 1 As shown, the three-phase input terminal includes an A-phase input terminal, a B-phase input terminal and a C-phase input terminal, which are respectively connected to the filter module and connected to the autotransformer module after being filtered by the filter module.

[0033] In this embodiment, the filter module is a high-frequency filter composed of an input inductor and a filter capacitor, which is used to filter out input high-frequency harmonics. Figure 1 As shown, the first inductor L1 and the first capacitor C1, the second capacitor C2, and the third capacitor C3 connected in parallel form a high-frequency filter with a cutoff frequency of 20KHz. The high-frequency filter can greatly reduce the high-frequency harmonics generated in the rectifier and improve the quality of electric energy. At the same time, it can also reduce the damage of harmonics to power equipment such as transformers and capacitors, and extend the service life of the equipment.

[0034] The first end of the first inductor is connected to the A-phase input terminal, and the other end is connected in series with the first capacitor and grounded. The second end of the first inductor is connected to the B-phase input terminal, and the other end is connected in series with the second capacitor and grounded. The third end of the first inductor is connected to the C-phase input terminal, and the other end is connected in series with the third capacitor and grounded. The non-grounded ends of the first capacitor, the second capacitor and the third capacitor are electrically connected to the input end of the phase-shifting transformer module.

[0035] In this embodiment, the phase-shifting transformer module adopts a phase-shifting transformer T1. The input three-phase power is filtered at high frequency and then sent to the phase-shifting transformer T1 with an independent iron core structure. The phase-shifting transformer T1 converts the input three-phase power into six phases and meets the phase requirements of twelve-phase rectification. It is also called a phase-shifting autotransformer. The new autotransformer topology is adopted. Compared with the traditional transformer that realizes 30-degree phase shift by converting the winding triangle and star connection, the primary power is directly transferred to the secondary except for a small part of it through electromagnetic coupling. Therefore, it is only 18% of the power level of the traditional transformer, which greatly reduces the volume and cost.

[0036] In this embodiment, the first rectifier includes a first rectifier circuit and a second rectifier circuit, the first output end of the phase-shifting transformer module is electrically connected to the first rectifier circuit, and the second output end of the phase-shifting transformer module is electrically connected to the second rectifier circuit; the first rectifier circuit and the second rectifier circuit are connected in parallel and electrically connected to the full-bridge module; wherein the first rectifier circuit and the second rectifier circuit are three-phase bridge uncontrolled rectifier circuits.

[0037] The first rectifier circuit includes a first rectifier branch, a second rectifier branch and a third rectifier branch connected in parallel with each other. The first rectifier branch includes a first rectifier diode S1 and a second rectifier diode S2 connected in series. The first rectifier diode S1 and the second rectifier diode S2 are connected to the first end of the first output end of the phase-shifting transformer module. The second rectifier branch includes a third rectifier diode S3 and a fourth rectifier diode S4 connected in series. The third rectifier diode S3 and the fourth rectifier diode S4 are connected to the second end of the first output end of the phase-shifting transformer module. The third rectifier branch includes a fifth rectifier diode S5 and a sixth rectifier diode S6 connected in series. The fifth rectifier diode S5 and the sixth rectifier diode S6 are connected to the third end of the first output end of the phase-shifting transformer module. Similarly, the second rectifier circuit includes a fourth rectifier branch, a fifth rectifier branch and a sixth rectifier branch connected in parallel with each other, the fourth rectifier branch includes a seventh rectifier diode S7 and an eighth rectifier diode S8 connected in series, the seventh rectifier diode S7 and the eighth rectifier diode S8 are connected to the first end of the second output end of the phase-shifting transformer module, the fifth rectifier branch includes a ninth rectifier diode S9 and a tenth rectifier diode S10 connected in series, the ninth rectifier diode S9 and the tenth rectifier diode S10 are connected to the second end of the second output end of the phase-shifting transformer module, and the sixth rectifier branch includes an eleventh rectifier diode S11 and a twelfth rectifier diode S12 connected in series, the eleventh rectifier diode S11 and the twelfth rectifier diode S12 are connected to the third end of the second output end of the phase-shifting transformer module.

[0038] The above-mentioned rectifier diodes are all arranged in the same direction, that is, the anode of the first rectifier diode S1 is connected to the cathode of the second rectifier diode S2, the anode of the third rectifier diode S3 is connected to the cathode of the fourth rectifier diode S4, the anode of the fifth rectifier diode S5 is connected to the cathode of the sixth rectifier diode S6, the cathodes of the first rectifier diode S1, the third rectifier diode S3, and the fifth rectifier diode S5 are connected to form a common cathode group, and the anodes of the second rectifier diode S2, the fourth rectifier diode S4, and the sixth rectifier diode S6 are connected to form a common anode group. The cathodes of the first rectifier diode S1, the third rectifier diode S3, and the fifth rectifier diode S5 are connected to the first DC terminal U1, and the anodes of the second rectifier diode S2, the fourth rectifier diode S4, and the sixth rectifier diode S6 are connected to the first DC terminal U1'; the second rectifier circuit is also the same, and no further description is given here.

[0039] The rectification in the above-mentioned first rectifier module adopts twelve-pulse uncontrolled rectification technology, which is composed of a total of 12 rectifier diodes. The basic principle of the uncontrolled rectifier circuit is to use the conduction and cutoff characteristics of the diode to realize the unidirectional flow of current. When the AC signal enters the circuit, the voltage of the positive half cycle is greater than the forward turn-on voltage of the diode, so that the diode is forward-conducted and the current can pass. When the voltage of the negative half cycle is less than the forward turn-on voltage of the diode, the diode is in the cut-off state and the current is blocked. In this way, only the current of the positive half cycle can pass through the diode, and the current of the negative half cycle is isolated, thereby realizing the conversion of AC current to DC current. The twelve-pulse rectification part can obtain a smoother bus voltage and can effectively reduce the 5th and 7th harmonics in the rectification.

[0040] The output end of the first rectifier module is connected to the input end of the full-bridge module to further adjust the converted DC power to meet the voltage and current requirements of a specific device or system. In this embodiment, the 270V DC voltage required for ground power supply of the aircraft is met.

[0041] In this embodiment, the full-bridge module includes a first switch branch and a second switch branch connected in parallel therewith, the first switch branch includes a first switch device Q1 and a second switch device Q2 connected in series, the second switch branch includes a third switch device Q3 and a fourth switch device Q4 connected in series, the first switch device Q1 and the second switch device Q2 are connected in parallel with the sixth capacitor C6 and the seventh capacitor C7 respectively; the first switch device Q1, the second switch device Q2, the third switch device Q3 and the fourth switch device Q4 are controlled by g1, g2, g3, and g4 signals respectively, and adopt Figure 2 Limited bipolar control shown.

[0042] The first DC terminals U1 to U1' are set between the two ends of the first switch branch and the two ends of the second switch branch, and the second DC terminals U2 to U2' are set between the series connection point of the first switch device and the second switch device and the series connection point of the third switch device and the fourth switch device. The collector of the first switch device Q1 is connected to the U1 end and the collector of the third switch device Q3, respectively, and the emitter of the first switch device Q1 is connected to the collector of the second switch device Q2 and one end of the primary winding N1 of the transformer module; the emitter of the second switch device Q2 is connected to the U1' end and the emitter of the fourth switch device Q4; the emitter of the third switch device Q3 is connected to the collector of the fourth switch device Q4 and the other end of the primary winding N1 of the transformer module.

[0043] The first DC terminals U1-U1' are connected in parallel with the fourth capacitor C4 and the fifth capacitor C5 connected in series, the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel with the first resistor R1 and the second resistor R2 connected in series, the first resistor R1 is connected in series with the fifth capacitor C5, and the second resistor R2 is connected in series with the fourth capacitor C4. The fourth capacitor C4, the fifth capacitor C5, the first resistor R1 and the second resistor R2 form a filter circuit, the fourth capacitor C4 and the fifth capacitor C5 are large-capacity electrolytic capacitors, the first resistor R1 and the second resistor R2 are used for voltage balancing, so that the working voltage of the large-capacity electrolytic capacitor has a certain safety margin.

[0044] The first end of the first resistor R1 is connected to the first DC terminal U1, and the second end of the first resistor R1 is respectively connected to the first end of the second resistor R2, and between the fourth capacitor C4 and the fifth capacitor C5; the second end of the second resistor R2 is connected to the first DC terminal U1'; the first end of the fourth capacitor C4 is connected to the first DC terminal U1, and the second end of the fourth capacitor C4 is respectively connected to between the first resistor R1 and the second resistor R2, and the first end of the fifth capacitor C5; the second end of the fifth capacitor C5 is connected to the first DC terminal U1'.

[0045] The first switch device Q1, the second switch device Q2, the third switch device Q3 and the fourth switch device Q4 are insulated gate bipolar transistors IGBTs. The IGBTs have a strong current carrying capacity and can withstand large currents and voltages. They are suitable for high-power applications and high-voltage applications. The IGBTs have a low on-resistance and can achieve high-efficiency power regulation, increasing the efficiency of the power supply. The IGBTs can complete switching operations in a short time, thereby improving the performance of the power supply.

[0046] In this embodiment, the second rectifier module includes a third switch branch and a fourth switch branch connected in parallel therewith, the third switch branch includes a first diode G1 and a second diode G2 connected in series, the first diode G1 and the second diode G2 are connected to one end of the secondary winding of the transformer module, the fourth switch branch includes a third diode G3 and a fourth diode G4 connected in series, the third diode G3 and the fourth diode G4 are connected to the other end of the secondary winding of the transformer module.

[0047] The third DC terminals U3-U3' are set between the two ends of the fourth switch branch and the two ends of the third switch branch, the fourth DC terminals U4-U4' are set between the series connection point of the first diode G1 and the second diode G2 and the series connection point of the third diode G3 and the fourth diode G4, the third DC terminal is connected in parallel with the ninth capacitor C9, the third inductor L3 is connected in series between the third diode G3 and the ninth capacitor C9, and the third DC terminal is connected to the power supply output terminal. Capacitors and inductors are used to stabilize voltage and current.

[0048] The cathode of the first diode G1 is respectively connected to the cathode of the third diode G3 and one end of the third inductor L3, and the other end of the third inductor L3 is respectively connected to one end of the ninth capacitor C9 and the DC+ output end; the anode of the first diode G1 is respectively connected to one end of the secondary winding and the cathode of the second diode G2, and the anode of the second diode G2 is respectively connected to the anode of the fourth diode G4 and the other end of the ninth capacitor C9, and is connected to the DC- output end; the anode of the third diode G3 is respectively connected to the other end of the secondary winding and the cathode of the fourth diode G4.

[0049] In this embodiment, the transformer module T2 includes a primary winding N1, a secondary winding N2 and an iron core between the primary winding N1 and the secondary winding N2, the primary winding N1 is connected to the second DC terminal of the full-bridge module, the secondary winding N2 is connected to the fourth DC terminal of the second rectifier module, and the primary winding N1 and the secondary winding N2 are magnetically coupled through the iron core.

[0050] A second inductor L2 and an eighth capacitor C8 are connected in series between the second DC terminals U2-U2' of the full-bridge module and the primary winding N1. The inductor protects the circuit and equipment by stabilizing the current and limiting the current, and the capacitor ensures the stable operation of the circuit by stabilizing the voltage and reducing voltage fluctuations.

[0051] One end of the second inductor L2 is connected to the second DC terminal U2, and the other end is connected to one end of the eighth capacitor C8. The other end of the eighth capacitor C8 is connected to one end of the primary winding N1, and the other end of the primary winding N1 is connected to the second DC terminal U2'.

[0052] In this embodiment, the DC-DC converter adopts the existing advanced ZVZCS soft switching technology, and cooperates with the full-bridge soft switching topology of ZVZCS with a resonant circuit to realize the full range of leading and lagging bridge arms, and adopts limited bipolar control (such as Figure 2 As shown). The key to soft switching is to use limited bipolar logic control to make the current or voltage waveform formed by the resonant circuit meet the requirements of the IGBT operating in a zero current or zero voltage state. The ZVZCS soft switching converter using the IGBT insulated gate bipolar transistor is more reliable than the ZVS converter of the US patent. Because of the essential properties of the IGBT device, there is a tail current during the IGBT shutdown process, which leads to a slower IGBT shutdown speed and increased power consumption. The existence of the tail current makes it difficult for the IGBT to achieve zero voltage shutdown, but it is easy to achieve zero current shutdown.

[0053] Working principle details:

[0054] First, three-phase AC power is input into the entire power supply system from the three-phase input terminal. The input three-phase AC power passes through the filtering module to remove noise and clutter in the AC power, making the input current purer; the filtered AC power enters the phase-shifting transformer module for phase shifting, and the AC power output by the phase-shifting transformer module passes through the first rectifier module for 12-pulse rectification to convert the AC power into DC power.

[0055] Secondly, the DC power output by the first rectifier module passes through the full-bridge module, which modulates the DC power by controlling the switching state of the switching device. The current output by the full-bridge module passes through the transformer module to further adjust the voltage amplitude. The current output by the transformer module passes through the second rectifier module and is rectified again to ensure that the output current is stable DC power.

[0056] Finally, the DC power processed by the second rectifier module is output from the power output end to provide stable 270V DC power for various electronic equipment on the aircraft.

[0057] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A 270V aircraft ground high voltage DC static power supply, characterized in that: It includes a three-phase input terminal, a filter module, a phase-shifting transformer module, a first rectifier module, a full-bridge module, a transformer module, a second rectifier module and a power supply output terminal connected in sequence; The first rectifier module includes a first rectifier circuit and a second rectifier circuit, the first output end of the phase-shifting transformer module is electrically connected to the first rectifier circuit, and the second output end of the phase-shifting transformer module is electrically connected to the second rectifier circuit; the first rectifier circuit and the second rectifier circuit are connected in parallel and electrically connected to the full-bridge module; The first rectifying circuit includes a first rectifying branch, a second rectifying branch and a third rectifying branch connected in parallel, and the second rectifying circuit includes a fourth rectifying branch, a fifth rectifying branch and a sixth rectifying branch connected in parallel.

2. A 270V aircraft ground high voltage DC static power supply as claimed in claim 1, characterized in that: The filtering module is a high-frequency filter composed of a first inductor and a first capacitor, a second capacitor and a third capacitor connected in parallel. The first end of the first inductor is connected to the A-phase input terminal, and the other end is connected in series with the first capacitor and grounded. The second end of the first inductor is connected to the B-phase input terminal, and the other end is connected in series with the second capacitor and grounded. The third end of the first inductor is connected to the C-phase input terminal, and the other end is connected in series with the third capacitor and grounded. The non-grounded ends of the first capacitor, the second capacitor and the third capacitor are electrically connected to the input end of the phase-shifting transformer module.

3. A 270V aircraft ground high voltage DC static power supply as claimed in claim 1, characterized in that: The phase-shifting transformer module adopts a phase-shifting transformer.

4. A 270V aircraft ground high voltage DC static power supply as claimed in claim 1, characterized in that: The first rectifying branch includes a first rectifying diode and a second rectifying diode connected in series, and the first rectifying diode and the second rectifying diode are connected to the first end of the first output end of the phase-shifting transformer module. The second rectifying branch includes a third rectifying diode and a fourth rectifying diode connected in series, and the third rectifying diode and the fourth rectifying diode are connected to the second end of the first output end of the phase-shifting transformer module. The third rectifying branch includes a fifth rectifying diode and a sixth rectifying diode connected in series, and the fifth rectifying diode and the sixth rectifying diode are connected to the third end of the first output end of the phase-shifting transformer module.

5. A 270V aircraft ground high voltage DC static power supply as claimed in claim 1, characterized in that: The fourth rectifying branch includes a seventh rectifying diode and an eighth rectifying diode connected in series, and the seventh rectifying diode and the eighth rectifying diode are connected to the first end of the second output end of the phase-shifting transformer module. The fifth rectifying branch includes a ninth rectifying diode and a tenth rectifying diode connected in series, and the ninth rectifying diode and the tenth rectifying diode are connected to the second end of the second output end of the phase-shifting transformer module. The sixth rectifying branch includes an eleventh rectifying diode and a twelfth rectifying diode connected in series, and the eleventh rectifying diode and the twelfth rectifying diode are connected to the third end of the second output end of the phase-shifting transformer module.

6. A 270V aircraft ground high voltage DC static power supply as claimed in claim 1, characterized in that: The full-bridge module includes a first switch branch and a second switch branch connected in parallel therewith.

7. A 270V aircraft ground high voltage DC static power supply as claimed in claim 6, characterized in that: The first switch branch includes a first switch device and a second switch device connected in series, and the first switch device and the second switch device are connected to one end of the primary winding of the transformer module. The second switch branch includes a third switch device and a fourth switch device connected in series, and the third switch device and the fourth switch device are connected to the other end of the primary winding of the transformer module.

8. A 270V aircraft ground high voltage DC static power supply as claimed in claim 7, characterized in that: The first switch device, the second switch device, the third switch device and the fourth switch device are all insulated gate bipolar transistors.

9. A 270V aircraft ground high voltage DC static power supply as claimed in claim 1, characterized in that: The second rectifier module includes a third switch branch and a fourth switch branch connected in parallel therewith.

10. A 270V aircraft ground high voltage DC static power supply as claimed in claim 9, characterized in that: The third switch branch includes a first diode and a second diode connected in series, and the first diode and the second diode are connected to one end of the secondary winding of the transformer module. The fourth switch branch includes a third diode and a fourth diode connected in series, and the third diode and the fourth diode are connected to the other end of the secondary winding of the transformer module.

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