Spatial high-efficiency high-voltage direct current module

Abstract

The utility model discloses a spatial high-efficiency high-voltage direct current module, which belongs to the technical field of high-voltage direct current output and comprises an input rectifying and filtering module, a step-down chopper circuit module, a direct current DC1, a direct current DC2, a direct current DC1, a direct current DC1, a direct current DC1, a direct current DC2, a direct current DC1 and a direct current DC1, the three-phase LLC resonant inverter circuit module is used for converting direct current DC2 into high-voltage alternating current AC2, the output rectifying and filtering module is used for converting the high-voltage alternating current AC2 into high-voltage direct current DC0, and the fault isolating circuit module is used for isolating a fault part from other parts when the modules fail. According to the technical key points, the magnitude of the output voltage can be adjusted by controlling the on-off time of a full-control device IGBT (Insulated Gate Bipolar Transistor), so that the stability and the accuracy of the final output voltage are ensured, and in addition, the three-phase LLC resonant inverter circuit has relatively high conversion efficiency and relatively good electric energy quality, and can meet the requirement of high-efficiency high-voltage direct-current output.

Description

Technical Field

[0001] This utility model relates to the field of high voltage direct current output technology, specifically a high-efficiency high voltage direct current module for space applications. Background Technology

[0002] The space electric propulsion high-voltage DC module is an electronic device that converts the low-voltage DC power (such as 28V or 42V) of a satellite into a high-voltage DC power output. It is mainly used for ion pull-out at the gate of space radio frequency ion propulsion and is one of the two major power consumption modules in the entire PPU (the other being the radio frequency power supply module). Its efficiency and reliability determine the performance of the entire PPU and affect the reliability of the entire propulsion system.

[0003] In the existing technology, when converting low-voltage DC to high-voltage DC, it is usually difficult to balance efficiency and reliability. This will increase the power consumption of the entire PPU and, correspondingly, make its operating temperature too high, which is not conducive to its long-term operation. In addition, if the reliability of the output high-voltage DC is not high, it is difficult to maintain the stability of the entire propulsion system performance. Therefore, in order to address the above problems, a space high-efficiency high-voltage DC module is proposed. Utility Model Content

[0004] The technical problem this invention aims to solve is to provide a high-efficiency high-voltage DC module for space applications. This high-voltage DC output device converts DC1 into DC2, which is voltage-matched to subsequent circuits, through an internal step-down chopper circuit module. By controlling the on / off time of the fully controlled IGBT, the output voltage can be adjusted, thereby ensuring the stability and accuracy of the final output voltage. At the same time, the three-phase LLC resonant inverter circuit module has high conversion efficiency and good power quality, which can meet the high efficiency requirements of high-voltage DC output. This solves the technical problem in the prior art where it is difficult to balance efficiency and reliability when converting low-voltage DC to high-voltage DC, thus affecting the reliability of the entire propulsion system.

[0005] The technical solution adopted by the embodiments of this application to solve its technical problem is:

[0006] A high-efficiency high-voltage DC module includes an input rectifier and filter module for preprocessing the input power supply, converting AC power AC1 into DC power DC1 through rectification, filtering, and voltage regulation; a step-down chopper circuit module for chopping and stepping down DC1, converting DC1 into DC2 for voltage matching of subsequent circuits; for the step-down chopper circuit module, the output voltage can be adjusted by controlling the on / off time of the fully controlled IGBT device, thereby ensuring the stability and accuracy of the final output voltage; a three-phase LLC resonant inverter circuit module for converting DC2 into high-voltage AC2, which has high conversion efficiency and good power quality, meeting the high efficiency requirements of high-voltage DC output; an output rectifier and filter module for converting high-voltage AC2 into high-voltage DC0 through rectification, voltage regulation, and filtering; and a fault isolation circuit module for isolating the faulty part from other parts when the above modules fail.

[0007] In one possible implementation, the three-phase LLC resonant inverter circuit module is electrically connected to a switching circuit and a resonant circuit. The switching circuit includes twelve MOS transistors, with six transistors forming a pair of complementary switches connected between the three-phase power supply to control the circuit's on / off state. The resonant circuit consists of a resonant inductor Lr, a resonant capacitor Cr, and a magnetizing inductor Lm connected in series.

[0008] When the MOSFET in the inverter circuit is turned on, current flows from the DC power supply through the load, thus forming forward conduction. When the MOSFET is turned off, the magnetic energy in the transformer guides the current to the load terminals, forming reverse conduction. Since the MOSFET can be turned on and off using PWM control, it can generate AC signals that change in both directions, thus realizing the function of converting DC to AC. When the MOSFET is turned on, the input voltage forms a resonant circuit through the main coil and resonant capacitor, and the resonant current begins to increase. As the resonant current increases, a voltage is induced on the secondary side of the transformer, which is then converted into the required three-phase output voltage through the inverter output circuit. When the MOSFET is turned off, the resonant current continues to resonate through the secondary coil and resonant capacitor of the transformer until the next switching cycle begins.

[0009] In one possible implementation, the buck converter circuit module consists of a fully controlled IGBT, a freewheeling diode D, and a resistor R connected in series. An inductor L and a capacitor C are connected in parallel in the circuit. When the fully controlled IGBT is in the on-state, the power supply supplies power to the load, and VD = Vi. When the fully controlled IGBT is in the off-state, the load current freewheels through the diode D, and the voltage VD is approximately zero. At the end of one cycle, the fully controlled IGBT is turned on again, repeating the process of the previous cycle, thus achieving the function of buckling and reducing voltage. Furthermore, the duty cycle can be adjusted by controlling the on-time percentage of the fully controlled IGBT, thereby regulating the output voltage.

[0010] In one possible implementation, the output rectifier and filter module includes a voltage doubler rectifier circuit and a filter circuit. The voltage doubler rectifier circuit converts the input high-voltage AC power AC2 into high-voltage DC power DC0, and the DC0 voltage is higher than the AC power AC2 voltage. This technical solution can improve the output voltage and convert the input low-voltage AC signal into a high-voltage DC signal. The filter circuit filters the output DC0 to remove ripple and noise from the voltage, making the output voltage smoother and more stable, and improving the power supply quality.

[0011] In one possible implementation, the high-voltage AC2 output from the three-phase LLC resonant inverter circuit module is processed by a medium-frequency high-voltage transformer and transmitted to the voltage doubler rectifier circuit. In addition, a high-voltage current-limiting resistor is connected in series in the filter circuit. The above technical solution provides the necessary foundation for the normal operation of the entire output rectifier and filter module.

[0012] In one possible implementation, the input rectifier and filter module includes a bridge rectifier circuit, a filter circuit, and a voltage regulator circuit. The bridge rectifier circuit converts AC power into DC power (DC1), the filter circuit removes the AC component from the pulsating DC power, and the voltage regulator circuit stabilizes the voltage value. The above technical solution can complete the preprocessing of the input power supply, that is, convert AC mains power into DC power input.

[0013] In one possible implementation, the fault isolation circuit module is electrically connected to an optocoupler, which is used to control the on / off state of the circuit. When a circuit element fails and causes a short circuit, the fault isolation circuit can quickly disconnect the connection between that part of the circuit and other circuits through the optocoupler, protecting other components from being affected.

[0014] In summary, this utility model has the following beneficial technical effects:

[0015] This high-voltage DC output device converts DC1 into DC2, which is voltage-matched to subsequent circuits, through an internal step-down chopper circuit module. By controlling the on / off time of the fully controlled IGBT, the output voltage can be adjusted, thereby ensuring the stability and accuracy of the final output voltage. At the same time, the three-phase LLC resonant inverter circuit module has high conversion efficiency and good power quality, which can meet the high efficiency requirements of high-voltage DC output. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a flowchart illustrating the principle of this utility model;

[0018] Figure 2 This is a diagram of the step-down chopper circuit of this utility model;

[0019] Figure 3 This is a circuit diagram of the three-phase LLC resonant inverter of this utility model;

[0020] Figure 4 This is a circuit diagram of the filter circuit of this utility model;

[0021] Figure 5 This is the fault isolation circuit diagram of this utility model. Detailed Implementation

[0022] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0023] like Figure 1 As shown, this embodiment provides a high-efficiency high-voltage DC module, including an input rectifier and filter module for preprocessing the input power supply, converting AC power AC1 into DC power DC1 through rectification, filtering, and voltage regulation; a step-down chopper circuit module for chopping and stepping down DC1, converting DC1 into DC2 for voltage matching of subsequent circuits; for the step-down chopper circuit module, the output voltage can be adjusted by controlling the on / off time of the fully controlled IGBT device, thereby ensuring the stability and accuracy of the final output voltage; a three-phase LLC resonant inverter circuit module for converting DC2 into high-voltage AC2, which has high conversion efficiency and good power quality, meeting the high efficiency requirements of high-voltage DC output; an output rectifier and filter module for converting high-voltage AC2 into high-voltage DC0 through rectification, voltage regulation, and filtering; and a fault isolation circuit module for isolating the faulty part from other parts when the above modules fail.

[0024] The high-voltage AC2 output from the three-phase LLC resonant inverter circuit module is processed by a medium-frequency high-voltage transformer and transmitted to the voltage doubler rectifier circuit. In addition, a high-voltage current-limiting resistor is connected in series in the filter circuit. The above technical solution provides the necessary foundation for the normal operation of the entire output rectifier and filter module.

[0025] like Figure 3 As shown, the three-phase LLC resonant inverter circuit module is electrically connected to a switching circuit and a resonant circuit. The switching circuit includes twelve MOS switching transistors, with six transistors forming a pair of complementary switches, which are connected between the three-phase power supply to control the circuit's on / off state. The resonant circuit is composed of a resonant inductor Lr, a resonant capacitor Cr, and a magnetizing inductor Lm connected in series.

[0026] When the MOSFET in the inverter circuit is turned on, current flows from the DC power supply through the load, thus forming forward conduction. When the MOSFET is turned off, the magnetic energy in the transformer guides the current to the load terminals, forming reverse conduction. Since the MOSFET can be turned on and off using PWM control, it can generate AC signals that change in both directions, thus realizing the function of converting DC to AC. When the MOSFET is turned on, the input voltage forms a resonant circuit through the main coil and resonant capacitor, and the resonant current begins to increase. As the resonant current increases, a voltage is induced on the secondary side of the transformer, which is then converted into the required three-phase output voltage through the inverter output circuit. When the MOSFET is turned off, the resonant current continues to resonate through the secondary coil and resonant capacitor of the transformer until the next switching cycle begins.

[0027] like Figure 2 As shown, the buck converter circuit module consists of a fully controlled IGBT, a freewheeling diode D, and a resistor R connected in series. An inductor L and a capacitor C are connected in parallel in the circuit. When the fully controlled IGBT is in the on-state, the power supply supplies power to the load, and VD = Vi. When the fully controlled IGBT is in the off-state, the load current freewheels through the diode D, and the voltage VD is approximately zero. At the end of one cycle, the fully controlled IGBT is turned on again, repeating the process of the previous cycle, thus achieving the function of chopping and voltage reduction. Furthermore, the duty cycle can be adjusted by controlling the on-time percentage of the fully controlled IGBT, thereby regulating the output voltage.

[0028] like Figure 4As shown, the output rectifier and filter module includes a voltage doubler rectifier circuit and a filter circuit. The voltage doubler rectifier circuit converts the input high-voltage AC2 into high-voltage DC0, and the DC0 voltage is higher than the AC2 voltage. This technical solution can improve the output voltage and convert the input low-voltage AC signal into a high-voltage DC signal. The filter circuit filters the output DC0 to remove ripple and noise in the voltage, making the output voltage smoother and more stable, and improving the power supply quality.

[0029] like Figure 2 As shown, the input rectifier and filter module includes a bridge rectifier circuit, a filter circuit, and a voltage regulator circuit. The bridge rectifier circuit converts AC power into DC power (DC1), the filter circuit removes the AC component from the pulsating DC power, and the voltage regulator circuit stabilizes the voltage value. The above technical solution can complete the preprocessing of the input power supply, that is, convert AC mains power into DC power input.

[0030] like Figure 5 As shown, the fault isolation circuit module is electrically connected to an optocoupler, which is used to control the on / off state of the circuit. When a circuit component fails and causes a short circuit, the fault isolation circuit can quickly disconnect the connection between that part of the circuit and other circuits through the optocoupler, protecting other components from being affected.

[0031] To meet higher power demands, it is often necessary to connect multiple power electronic devices in parallel or series. Based on the above technical solutions, through reasonable layout and current sharing circuit design, it is possible to ensure that the current shared by each device is uniform, while ensuring the voltage balance of the devices, avoiding overvoltage damage to some devices due to uneven voltage, and the thermal balance between devices can prevent local overheating.

[0032] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A high-efficiency high-voltage DC module for spatial applications, characterized in that, include: The input rectifier and filter module is used to preprocess the input power supply, converting AC power AC1 into DC power DC1 through rectification, filtering, and voltage regulation. The step-down chopper circuit module is used to chop and step down the DC power DC1, converting DC1 into DC2 that is voltage-matched to subsequent circuits. A three-phase LLC resonant inverter circuit module is used to convert direct current DC2 into high-voltage alternating current AC2. The output rectifier and filter module is used to convert high-voltage AC2 into high-voltage DC0 through rectification, voltage regulation and filtering. The fault isolation circuit module is used to isolate the faulty part from other parts when the above-mentioned modules fail.

2. The high-efficiency high-voltage DC module for space applications according to claim 1, characterized in that: The three-phase LLC resonant inverter circuit module consists of two electrically connected parts: a switching circuit and a resonant circuit. The switching circuit includes twelve MOSFETs, with six transistors forming a pair of complementary switches, which are connected between the three-phase power supply to control the circuit's on / off state. The resonant circuit consists of a resonant inductor Lr, a resonant capacitor Cr, and a magnetizing inductor Lm connected in series.

3. The high-efficiency high-voltage DC module according to claim 1, characterized in that: The buck chopper circuit module consists of a fully controlled IGBT, a freewheeling diode D, and a resistor R connected in series, and an inductor L and a capacitor C are connected in parallel in the circuit.

4. A high-efficiency high-voltage DC module for space applications according to claim 1, characterized in that: The output rectifier and filter module includes a voltage doubler rectifier circuit and a filter circuit. The voltage doubler rectifier circuit is used to convert the input high-voltage AC2 into high-voltage DC0, and the DC0 voltage is higher than the AC2 voltage. The filter circuit filters the output DC0 to remove ripple and noise from the voltage.

5. A high-efficiency high-voltage DC module for space applications according to claim 4, characterized in that: The high-voltage AC power AC2 output from the three-phase LLC resonant inverter circuit module is processed by the medium-frequency high-voltage transformer and transmitted to the voltage doubler rectifier circuit. In addition, a high-voltage current-limiting resistor is connected in series in the filter circuit.

6. A high-efficiency high-voltage DC module for space applications according to claim 1, characterized in that: The input rectifier and filter module includes a bridge rectifier circuit, a filter circuit, and a voltage regulator circuit. The bridge rectifier circuit converts AC power into DC power (DC1), the filter circuit removes the AC component from the pulsating DC power, and the voltage regulator circuit stabilizes the voltage value.

7. A high-efficiency high-voltage DC module for space applications according to claim 1, characterized in that: The fault isolation circuit module is electrically connected to an optocoupler, which is used to control the on / off state of the circuit.

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