A three-phase full-voltage aa type safety power supply

Abstract

The application discloses a three-phase full-voltage AA type safety power supply, which comprises an input voltage selection unit, a relay allocation unit, a central control processing module, an output power supply detection unit and three-phase double H-bridge voltage transformation reduction circuits, the central control processing module is electrically connected with the input voltage selection unit, the relay allocation unit, the output power supply detection unit and the three-phase double H-bridge voltage transformation reduction circuits respectively, each of the three-phase double H-bridge voltage transformation reduction circuits comprises a front-stage common-source silicon carbide H-bridge, a transformer, a rear-stage common-source silicon carbide H-bridge and a phase-shifting driving synchronous reduction group, the input end of the front-stage common-source silicon carbide H-bridge is electrically connected with the relay allocation unit, the output end of the front-stage common-source silicon carbide H-bridge is electrically connected with the transformer and the phase-shifting driving synchronous reduction group respectively, the transformer is electrically connected with the rear-stage common-source silicon carbide H-bridge, and the rear-stage common-source silicon carbide H-bridge is electrically connected with the output power supply detection unit and the rear-stage common-source silicon carbide H-bridge respectively. The application can achieve the effects of reducing the volume, lowering the loss and saving the cost.

Description

Technical Field

[0001] This invention relates to the field of smart grid safety power supplies, and in particular to a three-phase full-voltage AA type safety power supply. Background Technology

[0002] Traditional IT systems, smart grids, and other power systems that require power isolation mostly use three-phase power frequency isolation transformers and three-phase isolation inverters. Because the power frequency voltage is low and cannot be converted to high frequency, the isolation transformer is very large, heavy, expensive, and inefficient. These are all drawbacks of power frequency transformers. Although the size is reduced when using three-phase isolation inverters, the isolated three-phase power can only be obtained after a complex process of rectification, filtering, PFC boost, LLC modulation, rectification, filtering, and inversion. Furthermore, the circuit structure of three-phase isolation inverters is very complex, resulting in high cost and many potential failure points. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a three-phase full-voltage AA type safe power supply.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A three-phase full-voltage AA-type safety power supply includes: an input voltage selection unit, a relay adjustment unit, a central control processing module, an output power detection unit, and a three-phase dual H-bridge transformer restoration circuit. The central control processing module is electrically connected to the input voltage selection unit, the relay adjustment unit, the output power detection unit, and the three-phase dual H-bridge transformer restoration circuit, respectively.

[0006] The input voltage selection unit is used to connect to the power supply and input the voltage source signal into the central control processing module. The central control processing module controls the on / off of the relay adjustment unit according to the voltage source signal. The output terminal of the relay adjustment unit is electrically connected to the three-phase double H-bridge transformer restoration circuit. The output terminal of the three-phase double H-bridge transformer restoration circuit outputs a voltage signal through the output power detection unit.

[0007] Each phase of the dual H-bridge transformer reduction circuit includes a front-stage common-source silicon carbide H-bridge, a transformer, a rear-stage common-source silicon carbide H-bridge, and a phase-shifting drive synchronous reduction group. The input terminal of the front-stage common-source silicon carbide H-bridge is electrically connected to the relay modulation unit. The output terminal of the front-stage common-source silicon carbide H-bridge is electrically connected to the primary winding of the transformer and the input terminal of the phase-shifting drive synchronous reduction group, respectively. The secondary winding of the transformer is electrically connected to the rear-stage common-source silicon carbide H-bridge. The output terminal of the rear-stage common-source silicon carbide H-bridge is electrically connected to the output power detection unit and the rear-stage common-source silicon carbide H-bridge, respectively.

[0008] In one embodiment, a circuit breaker is provided between the input terminal of the input voltage selection unit and the input power supply.

[0009] In one embodiment, in the three-phase dual H-bridge transformer reduction circuit, the phase lead angle between every two transformers is 120 degrees.

[0010] In one embodiment, the input voltage selection unit includes a synchronization signal sampling circuit and a synchronization square wave locking circuit. The input terminal of the synchronization signal sampling circuit is used to receive a synchronization power signal, and the output terminal of the synchronization signal sampling circuit is electrically connected to the synchronization square wave locking circuit. The synchronization square wave locking circuit is electrically connected to the relay modulation unit and the phase shift drive synchronization restoration group, respectively.

[0011] In one embodiment, the phase-shift drive synchronous restoration group includes a phase-shift drive synchronous circuit, a secondary-side restoration drive circuit, a pre-stage drive circuit, and a post-stage drive circuit. The input terminal of the phase-shift drive synchronous circuit is electrically connected to the output terminal of the synchronous square wave locking circuit. The output terminal of the phase-shift drive synchronous circuit is electrically connected to the secondary-side restoration drive circuit and the pre-stage drive circuit, respectively. The pre-stage drive circuit is used to drive the pre-stage common-source silicon carbide H-bridge to work.

[0012] The input terminal of the secondary-side reduction drive circuit is also electrically connected to the transformer, the output terminal of the subsequent drive circuit is electrically connected to the subsequent drive circuit, and the subsequent drive circuit is used to drive the subsequent common-source silicon carbide H-bridge to work.

[0013] In one embodiment, the central control processing module includes a CPU processor, a differential acquisition circuit, and a DC acquisition circuit. The CPU processor is electrically connected to the differential acquisition circuit and the DC acquisition circuit, respectively. The CPU processor is also electrically connected to the input voltage selection unit, the relay adjustment unit, the output power detection unit, and the three-phase dual H-bridge transformer restoration circuit, respectively.

[0014] In one embodiment, the central control processing module further includes a phase shift control circuit, which is electrically connected to the CPU processor, and the output of the phase shift control circuit is also electrically connected to the input of the phase shift drive synchronous restoration group.

[0015] In one embodiment, the front-end common-source silicon carbide H-bridge includes eight silicon carbide switching transistors. Every two silicon carbide switching transistors are connected in series to form a control transistor group of the H-bridge, and four control transistor groups are connected in series to form the H-bridge.

[0016] Two of the series connection nodes of the control tube groups are electrically connected to one primary input terminal of the transformer, and the other two series connection nodes of the control tube groups are electrically connected to the other primary input terminal of the transformer.

[0017] In one embodiment, the subsequent common-source silicon carbide H-bridge includes four independently controlled dual silicon carbide MOS transistor groups, which are connected in series sequentially.

[0018] Two of the series connection nodes of the dual silicon carbide MOS transistor groups are electrically connected to the primary output terminal of the transformer, and the other two series connection nodes of the dual silicon carbide MOS transistor groups are electrically connected to the other secondary output terminal of the transformer.

[0019] The advantages and beneficial effects of this invention compared to the prior art are as follows:

[0020] This invention is a three-phase full-voltage AA-type safety power supply. It employs a front-end common-source silicon carbide H-bridge, a transformer, a rear-end common-source silicon carbide H-bridge, and a phase-shift drive synchronous restoration group. A bidirectional electronic switch is formed using common-source silicon carbide MOSFETs. Power is directly fed into the MOSFETs without the need for complex circuits such as rectification, filtering, and PFC. A high-frequency phase-shift drive synchronous method directly modulates various voltages, including AC, square wave, and triangular wave. The high-frequency transformer generates a four-quadrant power supply, which is then restored and output through the synchronous restoration circuit. This overcomes the limitation of isolation transformers, which can only accept AC sinusoidal inputs. The efficiency reaches over 95%, far exceeding that of three-phase power frequency transformers and three-phase isolation inverters. In a sense, it is a device that can isolate and restore various voltage sources 1:1, overcoming the single-function limitation of transformers, reducing size, lowering losses, and saving costs. It can be widely used in new energy, smart grids, and safe electricity use, especially as a power supply for research laboratories and hospitals requiring isolation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a three-phase full-voltage AA-type safety power supply according to an embodiment of the present invention.

[0022] Figure 2 for Figure 1 The circuit diagram of the input voltage selection unit is shown below;

[0023] Figure 3 for Figure 1 The circuit diagram of the phase-shift drive synchronization circuit shown is (I).

[0024] Figure 4 for Figure 1 The circuit diagram of the phase-shift drive synchronization circuit shown is (II);

[0025] Figure 5 for Figure 1 The circuit diagram of the secondary-side reduction drive circuit is shown below;

[0026] Figure 6 for Figure 1 The circuit diagram of the pre-stage driver circuit shown is shown.

[0027] Figure 7 for Figure 1 The circuit diagram of the phase-shift control circuit shown is shown.

[0028] Figure 8 for Figure 1 The circuit diagram of the differential acquisition circuit shown is shown.

[0029] Figure 9 for Figure 1 The circuit diagram of the DC acquisition circuit shown is shown.

[0030] Figure 10 for Figure 1 The circuit diagram shown includes the front-end common-source silicon carbide H-bridge, the transformer, and the rear-end common-source silicon carbide H-bridge.

[0031] Figure 11 for Figure 1 The waveform diagram of phase-shift drive is shown below;

[0032] Figure 12 This is the circuit diagram of the present invention when the three-phase AC input B is 120 degrees ahead, C is 120 degrees behind, and A is 0 degrees.

[0033] Figure 13 for Figure 1 The waveform diagram of the three-phase AC four-quadrant output power supply is shown below;

[0034] Figure 14 for Figure 1 The waveform diagram of the three-phase AC combined power supply is shown below;

[0035] Figure 15 for Figure 1 The waveform diagram of the combined triangular and square wave AC power supply is shown below.

[0036] Figure 16 for Figure 1 The waveforms shown are those of short-circuit arc extinguishing and fault arc extinguishing operation.

[0037] Figure 17 for Figure 1 The diagram shown is a schematic of a three-phase full-voltage AA-type safety power supply. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0039] This is a three-phase full-voltage AA-type safety power supply that uses 12 sets of silicon carbide (SIC) MOS transistors in a common-source manner to form a bidirectional electronic switch and uses high-frequency phase-shift modulation synchronous restoration. It fundamentally changes the requirement for a large transformer and a complex three-phase inverter when isolating three-phase electricity, and also changes the purpose of not being able to isolate three-phase square waves and triangular waves.

[0040] Traditional transformers require tapping to change the output voltage, whereas three-phase full-voltage AA-type safety power supplies change the output voltage simply by altering the phase shift angle. In terms of efficiency, the three-phase full-voltage AA-type safety power supply achieves over 95%, far exceeding the efficiency of three-phase power frequency transformers and three-phase isolation inverters. In a sense, it is a device that can isolate and restore various voltage sources 1:1, overcoming the single-function limitations of transformers, reducing size, lowering losses, and saving costs. It can be widely used in new energy, smart grids, and safe electricity use, especially as a power supply for isolated applications in research laboratories and hospitals. The output restoration electrode of the three-phase full-voltage AA-type safety power supply also uses 12 sets of bidirectional electronic switches, which naturally form a high-speed electronic circuit breaker. It can shut down at a speed of microseconds (µs) between the neutral and phase lines, and between phase lines, when a short circuit fault occurs due to load or equipment. The LC channel formed by low-pass filtering dissipates the residual current in the line, achieving the purpose of eliminating sparks during load or line short circuits, thus improving electrical fire safety.

[0041] The three-phase full-voltage AA-type safety power supply can be used in various power supply applications requiring three-phase electrical isolation. It can achieve AC-AC, DC-DC, square wave-square wave, triangular wave-triangular wave, and even isolation of voltage sources of any waveform. It employs DSP or MCU phase-shifting for closed-loop voltage regulation, ensuring stable voltage output even in environments with large voltage fluctuations. It also incorporates waveform correction functionality, allowing real-time adjustment of the output power waveform by controlling the phase shift angle when the voltage waveform is non-standard. Fundamentally, it can replace isolation-type power frequency transformers, achieving a high-frequency transformation. The output LC filter channel can filter interference from grid harmonics.

[0042] The three-phase full-voltage AA-type safety power supply achieves high-frequency conversion of the three-phase power frequency transformer, fundamentally solving the problems of large size, heavy weight, and low efficiency associated with traditional power frequency transformers. This transforms low-voltage power distribution IT systems. In the new energy field, it can isolate and restore DC power, while also providing step-up and step-down functions. In industrial and commercial energy storage power supplies, it achieves isolation and voltage stabilization. In terms of safety power, power frequency transformers, due to their numerous windings and large copper wire capacitive area, have very large distributed capacitance, resulting in significant residual current that poses a threat to personal safety. The three-phase full-voltage AA-type safety power supply, with its high-frequency processing reaching tens to hundreds of kHz, uses very little copper in the transformer, resulting in small distributed capacitance and minimal residual current. In the civilian sector, it can be used as a power supply in household power distribution systems. In military applications, it serves as a safety guarantee power supply for network information security. In the commercial sector, it can be used in shopping malls, shops, office buildings, residential buildings, hospitals, schools, government agencies, banks, and fire protection systems. In industrial applications, it can be used in power distribution systems such as mining, metallurgy, factories, and smart grids.

[0043] This is a special power supply that integrates a three-phase power frequency transformer, a general-purpose voltage source with AC / DC input, voltage regulation, and isolation functions into one unit. It addresses the shortcomings of complex structure, large size, and high cost of three-phase power frequency transformers by using a high-frequency phase-shifting synchronous restoration method, thus solving the fundamental problems of size, weight, and efficiency. Simultaneously, it employs AA conversion technology, eliminating numerous steps such as rectification, filtering, PFC, boost conversion, and inversion from the three-phase power frequency inverter, reducing the number of components and potential failure points. The power supply directly enters an H-bridge bidirectional electronic switch for phase-shifting modulation. The high-frequency transformer splits the input voltage into three sets of four-quadrant voltages with 120-degree phase shifts, which are then restored to the original input voltage via a synchronous restoration circuit.

[0044] Specifically, please refer to Figures 1-17 A three-phase full-voltage AA-type safety power supply includes: an input voltage selection unit, a relay adjustment unit, a central control processing module, an output power detection unit, and a three-phase dual H-bridge transformer restoration circuit. The central control processing module is electrically connected to the input voltage selection unit, the relay adjustment unit, the output power detection unit, and the three-phase dual H-bridge transformer restoration circuit. In this embodiment, a circuit breaker is provided between the input terminal of the input voltage selection unit and the input power supply.

[0045] The input voltage selection unit is used to connect to the power supply and input the voltage source signal into the central control processing module. The central control processing module controls the on / off of the relay adjustment unit according to the voltage source signal. The output terminal of the relay adjustment unit is electrically connected to the three-phase double H-bridge transformer restoration circuit. The output terminal of the three-phase double H-bridge transformer restoration circuit outputs a voltage signal through the output power detection unit.

[0046] Each phase of the dual H-bridge transformer reduction circuit includes a front-stage common-source silicon carbide H-bridge, a transformer, a rear-stage common-source silicon carbide H-bridge, and a phase-shifting drive synchronous reduction group. The input terminal of the front-stage common-source silicon carbide H-bridge is electrically connected to the relay modulation unit. The output terminal of the front-stage common-source silicon carbide H-bridge is electrically connected to the primary winding of the transformer and the input terminal of the phase-shifting drive synchronous reduction group, respectively. The secondary winding of the transformer is electrically connected to the rear-stage common-source silicon carbide H-bridge. The output terminal of the rear-stage common-source silicon carbide H-bridge is electrically connected to the output power detection unit and the rear-stage common-source silicon carbide H-bridge, respectively.

[0047] It should be noted that the voltage source enters the input voltage selection unit through the circuit breaker Q1 and sends the obtained input voltage source signal to the CPU. After the CPU detects the voltage source, it controls the relay adjustment unit to send the voltage to the three H-bridges A / B / C. The A-group phase shift drive and synchronous restoration group is responsible for the AB voltage source, the B-group phase shift drive and synchronous restoration group is responsible for the BC voltage source, and the C-group phase shift drive and synchronous restoration group is responsible for the CA voltage source.

[0048] The drive signal for the subsequent synchronous restoration group comes from the transformer. When the A / B / C stage is not in operation or is not in operation, the three sets of H-bridge switches K9-K12, K21-K24, and K33-K36 are always in the on state to discharge the residual current output by the subsequent stage.

[0049] Preferably, in the three-phase dual H-bridge transformer reduction circuit, the phase lead angle between each pair of transformers is 120 degrees.

[0050] Please see Figure 2 The input voltage selection unit includes a synchronization signal sampling circuit and a synchronization square wave locking circuit. The input terminal of the synchronization signal sampling circuit is used to connect to the synchronization power signal, and the output terminal of the synchronization signal sampling circuit is electrically connected to the synchronization square wave locking circuit. The synchronization square wave locking circuit is electrically connected to the relay modulation unit and the phase shift drive synchronization restoration group, respectively.

[0051] Specifically, input terminal J1 is the synchronous signal sampling input. The A / B / C signals are sent to voltage divider resistors R12 / R12 / R18 / R21, R35 / R36 / R42 / R43, and R58 / R59 / R66 / R67 respectively to separate +VA / +VB / +VC. These signals are then sent to comparators U3 / U6 / U9 to obtain six sets of drive signals, which are then sent to the synchronous square wave lock-in circuit. The synchronous square wave lock-in circuit outputs synchronous square wave drive signals +APWM / -APWM / +BPWM / -BPWM / +CPWM / -CPWM with a 120-degree phase shift. When any two sets of inputs at input terminals J1-A / B / C are DC voltages, only the corresponding input set operates while the other set stops. At this time, the positive and negative comparison voltages of comparators U3 / U6 / U9 are respectively stripped to their corresponding comparators. When the input terminals J1-A / B / C acquire AC input signals U3 / U6 / U9, the upper half-cycle and the negative half-cycle of the AC signal are separated to generate a synchronization signal. When any one group is working, the other group is prohibited from working.

[0052] Please see Figure 2 The phase-shift drive synchronous restoration group includes a phase-shift drive synchronous circuit, a secondary-side restoration drive circuit, a pre-stage drive circuit, and a post-stage drive circuit. The input terminal of the phase-shift drive synchronous circuit is electrically connected to the output terminal of the synchronous square wave locking circuit. The output terminal of the phase-shift drive synchronous circuit is electrically connected to the secondary-side restoration drive circuit and the pre-stage drive circuit, respectively. The pre-stage drive circuit is used to drive the pre-stage common-source silicon carbide H-bridge to work.

[0053] The input terminal of the secondary-side reduction drive circuit is also electrically connected to the transformer, the output terminal of the subsequent drive circuit is electrically connected to the subsequent drive circuit, and the subsequent drive circuit is used to drive the subsequent common-source silicon carbide H-bridge to work.

[0054] The phase-shifting drive synchronization circuit consists of gate drivers U1 / U2. Taking group A as an example: when phase A is positive and phase B is negative, the synchronization square wave passes directly through diodes D1 / D3 / D5 / D7 and resistors R1 / R3 / R5 / R7, and is directly sent to the pre-stage drive circuit of Q2 / Q4 / Q6 / Q8 to drive MOS K3 / MOS K4 / MOS K7 / MOS K8. Since pins 1 / 5 / 8 / 12 of the gate circuit are high, the phase-shifting signal enters the gate driver through pins 2 / 6 / 9 / 13 of the gate circuit. After being amplified by the push-pull circuit, it is directly sent to the pre-stage drive circuit of Q1 / Q3 / Q5 / Q7 to drive MOS K1 / MOS K2 / MOS K5 / MOS K6. When phase B is positive and phase A is negative, the above process is reversed. The driving methods for groups B and C are the same as for group A.

[0055] Please see Figure 3 The secondary-side restoration drive circuit includes a transformer drive winding, an inverter U3, and a push-pull circuit. When the three-phase full-voltage AA-type safety power supply is stopped, and the inverter U3 is working, A+ / B+ sends the drive signal through H9 / H10 / H11 / H12 to the subsequent drive circuit. The subsequent drive circuit drives the secondary-side restoration MOS to turn off accordingly. When A+ is positive, MOS group K9 / MOS group K12 is turned off; when B+ is positive, MOS group K10 / MOS group K11 is turned off. At this time, the four-quadrant power supply is restored to a two-quadrant power supply and sent to the LC low-pass filter. The output power detection unit includes an LC low-pass filter.

[0056] Please see Figure 4 The subsequent drive circuit uses an isolated push-pull power supply. The 15V voltage is provided by a switching power supply and generated into four power supplies through a push-pull transformer. The four power supplies provide the main voltage VCC1 / VCC2 to the BUCK circuit. Chip U28 steps down VCC1 to a +20V drive power supply, and chip U30 generates a -5V drive power supply from VCC2, which powers the preceding and following drive circuits and the drive chip U17, respectively. Since the other groups are similar to group A, they will only be described once.

[0057] Please see Figure 5 The central control processing module includes a CPU processor, a differential acquisition circuit, and a DC acquisition circuit. The CPU processor is electrically connected to the differential acquisition circuit and the DC acquisition circuit, respectively. The CPU processor is also electrically connected to the input voltage selection unit, the relay adjustment unit, the output power detection unit, and the three-phase dual H-bridge transformer restoration circuit, respectively.

[0058] It should be noted that the differential acquisition circuit uses integrated chip U10 to acquire AC voltage and current. The AC current passes through J19 / J21 / J22 and enters the voltage divider resistors, generating IAP / IAN / IBP / IPN / ICP / ICN before entering the acquisition chip. The AC voltage passes through voltage acquisition transformers T5 / T6 / T7 and, after passing through the voltage divider resistors, enters the acquisition chip. The acquisition chip communicates with the CPU via SPI. The input voltage and current circuits are the same as this circuit. The DC acquisition circuit, i.e., the DC voltage and current acquisition circuit, uses an isolated power supply. Transformer T8 generates an isolated voltage of 5V-1V to power chip U13. DC voltage input can only be from channels A / C and B / C; input from channels A / B is invalid. The DC voltage is divided by resistors R57 / R63 / R71 / R77 / R82 / R87 / R92 before entering the ADC acquisition chip U12. U13 is an I2C isolated communication chip connected to the CPU.

[0059] The CPU processor uses the STM32 series. Since the phase-shifting processing is handled autonomously by hardware, the CPU processing becomes relatively simple. Pins 1, 2, and 3 of the CPU processor are used to handle relay operations, and SPI is responsible for processing data from the RN83 chip. I2C communication is used to process data from the memory and DC power input sections, and external communication uses RS485 and RS232.

[0060] Please see Figure 6 The central control processing module also includes a phase-shift control circuit, which is electrically connected to the CPU processor. The output of the phase-shift control circuit is also electrically connected to the input of the phase-shift drive synchronous restoration group. It should be noted that the phase-shift control circuit is composed of a phase-shift control chip U1. The adjustable potentiometer R2 is for manual voltage adjustment; when automatic voltage adjustment is enabled, the adjustable resistor R2 is removed. DISB is the enable signal. Pins 13 / 14 / 17 / 18 of chip U1 are phase-shift drive output pins, which send the drive signal to the gate driver for processing.

[0061] Furthermore, the pre-stage common-source silicon carbide H-bridge includes eight silicon carbide switching transistors. Every two silicon carbide switching transistors are connected in series to form a control transistor group of the H-bridge, and four control transistor groups are connected in series to form the H-bridge. The series connection node of two control transistor groups is electrically connected to one primary input terminal of the transformer, and the series connection node of the other two control transistor groups is electrically connected to the other primary input terminal of the transformer.

[0062] It should also be noted that the subsequent common-source silicon carbide H-bridge includes four independently controlled dual silicon carbide MOS transistor groups, which are connected in series sequentially; two of the series connection nodes of the dual silicon carbide MOS transistor groups are electrically connected to the primary output terminal of the transformer, and the other two series connection nodes of the dual silicon carbide MOS transistor groups are electrically connected to the other secondary output terminal of the transformer.

[0063] During operation, when phase A receives AC power and the starting point is exactly at the zero-crossing point, MOS K3 / MOS K4 / MOS K7 / MOS K8 enter the positive half-cycle direct-on state as a synchronous square wave. To reduce switching losses of the switching transistors, MOS K1 / MOS K2 / MOS K5 / MOS K6 undergo phase-shifted SPWM modulation. When MOS K2 / MOS K5 is in the energy transfer state, MOS group K9 / MOS group K12 enters the off state, and the secondary energy of the transformer is transferred by MOS group K10 / MOS group K11. When the energy transfer is by MOS K1 / MOS K6, MOS group K10 / MOS group K11 is off, and the energy is transferred by MOS group K9 / MOS group K12. The operating regions of phase B and phase C are similar to those of phase A and will not be repeated here. When phase A receives AC power in the negative half-cycle, the above operating mode is reversed. The same applies to DC power input.

[0064] When a short circuit fault occurs between any pair of phase lines or between any line-to-line fault at the A / B / C output terminals, or when a short circuit fault occurs in the load, all power switches on the secondary side turn on, while all switches on the primary side turn off. This action is completed within 200 nanoseconds. When the secondary side switches close, they consume all the remaining current in the circuit. When a fault arc is generated on the secondary side, the frequency of the oscillations within the time period differs from the frequency of the actual output current. At this time, the CPU collects the current and compares it with the original current. If the oscillation frequency is greater than the CPU's comparison frequency, it is considered a fault arc; otherwise, it is considered normal, and the sparks generated during the short circuit are suppressed.

[0065] The three-phase full-voltage AA-type safety power supply of this invention is applicable to various power types, such as DC, sinusoidal AC, square wave, pulse, triangular wave voltage, stepped wave voltage, etc., and is suitable for various power systems such as IT systems, smart grids, etc.

[0066] This invention fundamentally addresses the issues of weight, volume, and cost in traditional three-phase power frequency transformers, shifting from power frequency to high frequency; it also changes the traditional three-phase power frequency transformer by enabling linear voltage regulation in a stepped mode without ripples; it overcomes the limitations of traditional transformers in converting between triangular and square waves due to voltage harmonics; it addresses the inability of traditional transformers to function as DC isolation transformers; it improves the efficiency of traditional transformers; it adds arc-extinguishing functionality in case of short circuits or faults at the transformer output; and it achieves unlimited input and output capabilities for the transformer.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A three phase full voltage AA type safety power supply characterized by, The input voltage selection unit, the relay allocation unit, the central control processing module, the output power detection unit and the three-phase double H-bridge voltage reduction circuit are electrically connected. The input voltage selection unit is used for connecting the power supply and inputting the voltage source signal into the central control processing module. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees.

2. The three-phase full-voltage AA-type safety power supply according to claim 1, characterized in that, The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit.

3. The three-phase full-voltage AA-type safety power supply according to claim 2, characterized in that, The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply.

4. The three-phase full-voltage AA-type safety power supply of claim 1, wherein, In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees.

5. The three-phase full-voltage AA-type safety power supply according to claim 4, characterized in that, The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply.

6. The three-phase full-voltage AA-type safety power supply of claim 1, wherein, In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input voltage selection unit comprises a synchronous signal sampling circuit and a synchronous square wave locking circuit. The input end of the input voltage selection unit is provided with a circuit breaker between the input end and the input power supply. In the three-phase double H-bridge voltage reduction circuit, the phase lead angle between every two transformers is 120 degrees. The input 7. The three phase full voltage AA type safety power supply of claim 6, wherein, The central control processing module further comprises a phase shift control circuit, which is electrically connected with the CPU processor, and an output end of the phase shift control circuit is further electrically connected with an input end of the phase shift driving synchronous reduction group.

8. The three phase full voltage AA type safety power supply of claim 1, wherein, The front-stage common-source silicon carbide H-bridge comprises eight silicon carbide switch tubes, every two of which are connected in series to form a control tube group of the H-bridge, and four control tube groups are connected in series to form an H-bridge. The series connection nodes of two control tube groups are electrically connected with a primary input end of the transformer, and the series connection nodes of the other two control tube groups are electrically connected with another primary input end of the transformer.

9. The three phase full voltage AA type safety power supply of claim 1, wherein, The back-stage common-source silicon carbide H-bridge comprises four independently controlled double silicon carbide MOS tube groups, and four double silicon carbide MOS tube groups are connected in series. The series connection nodes of two double silicon carbide MOS tube groups are electrically connected with a secondary output end of the transformer, and the series connection nodes of the other two double silicon carbide MOS tube groups are electrically connected with another secondary output end of the transformer.

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