Direct-current power supply circuit with multi-power-supply collaborative quick response and thruster

Abstract

The invention relates to the technical field of power electronics, and discloses a multi-power-supply collaborative quick-response direct-current power supply circuit and thruster, and the direct-current power supply circuit comprises a main switching power supply module which is configured to convert an input voltage into a main output voltage according to a first reference voltage; the low-voltage side output end of the auxiliary switching power supply module is connected with the low-voltage side output end of the main switching power supply module, and the auxiliary switching power supply module is configured to convert the input voltage into an auxiliary output voltage according to a second reference voltage; the linear power supply module is connected between the high-voltage side output end of the auxiliary switch power supply module and the negative output end of the direct-current power supply circuit, and the linear power supply module is configured to output linear output voltage according to third reference voltage; wherein the auxiliary output voltage and the linear output voltage are used for adjusting the main output voltage so as to supply power to the load. According to the invention, the technical effects of improving the response speed of the output voltage and reducing the ripple of the output voltage can be achieved through multi-power-supply cooperative adjustment.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a DC power supply circuit and thruster with multiple power sources capable of coordinated rapid response. Background Art

[0002] In deep space exploration missions, thrusters are usually used to adjust the orbit and attitude of spacecraft. In order to meet the changes in the power demand of the thruster under different working conditions, the thruster power supply is often required to have the ability to continuously track the output voltage waveform and respond quickly under extremely light load conditions. Due to the limitations of materials in the extreme aerospace environment, it is difficult to set a high-voltage field effect transistor (MOSFET) on the secondary high-voltage rectifier side of the thruster power supply to achieve rapid voltage regulation, which affects the response speed of the thruster power supply.

[0003] In the related art, the phase margin and response speed of the power supply are generally improved by adjusting the control strategy of the thruster power supply. However, the control strategy can only be adjusted within the bandwidth determined by the power supply topology, and if the load of the power supply is a large resistance or a small current, even if the switch tube of the power supply is completely turned off, the output voltage of the power supply cannot drop quickly. Therefore, the improvement of the response speed in the related art is limited, and it is difficult to meet the demand for fast voltage response of the tiny thruster power supply, which in turn affects the working effect of the thruster. Summary of the invention

[0004] The present application provides a DC power supply circuit and thruster with multiple power sources coordinating for fast response, which solves the technical problem that the voltage response speed of the current tiny thruster power supply is difficult to meet the demand, resulting in affecting the working effect of the thruster. The output voltage is adjusted in a multi-coordinated manner by a DC power supply circuit composed of multiple different power modules, thereby achieving the technical effect of improving the response speed of the output voltage and reducing the output voltage ripple.

[0005] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, an embodiment of the present application provides a DC power supply circuit with multiple power supplies coordinating and responding quickly, the DC power supply circuit comprising:

[0007] a main switching power supply module, the main switching power supply module being configured to convert an input voltage into a main output voltage according to a first reference voltage;

[0008] an auxiliary switching power supply module, wherein a low-voltage side output terminal of the auxiliary switching power supply module is connected to a low-voltage side output terminal of the main switching power supply module, and the auxiliary switching power supply module is configured to convert the input voltage into an auxiliary output voltage according to a second reference voltage;

[0009] A linear power supply module, the linear power supply module is connected between the high-voltage side output terminal of the auxiliary switching power supply module and the negative output terminal of the DC power supply circuit, the linear power supply module is configured to output a linear output voltage according to a third reference voltage;

[0010] Among them, a load is suitable for connecting between the high-voltage side output terminal of the main switching power supply module and the negative output terminal of the DC power supply circuit, and the auxiliary output voltage and the linear output voltage are used to adjust the main output voltage to power the load.

[0011] The DC power supply circuit proposed in the embodiment of the present application forms a multi-power supply coordinated response mechanism through the main switch power supply module, the auxiliary switch power supply module and the linear power supply module. Through the connection relationship between the low-voltage side output end of the auxiliary switch power supply module and the low-voltage side output end of the main switch power supply module, the output end of the main switch power supply module and the output end of the auxiliary switch power supply module are reversely connected, so that the auxiliary output voltage and the linear output voltage are used to adjust the main output voltage to supply power to the load. Therefore, the embodiment of the present application, through the connection relationship between the low-voltage side output end of the auxiliary switch power supply module and the low-voltage side output end of the main switch power supply module, enables the auxiliary output voltage to be combined with the linear output voltage to reversely adjust the main output voltage, thereby shortening the adjustment time of the output voltage of the DC power supply circuit, improving the output voltage response speed of the DC power supply circuit, and the auxiliary switch power supply module combined with the linear power supply module can reduce the output voltage ripple of the DC power supply circuit, greatly improving the stability of the DC power supply circuit. In addition, the DC power supply circuit proposed in the embodiment of the present application can reduce the high-voltage auxiliary source circuit in the device, thereby reducing the volume of the output capacitor and reducing the circuit cost.

[0012] Optionally, in some embodiments of the present application, the first reference voltage, the second reference voltage and the third reference voltage are respectively determined according to the working mode of the DC power supply circuit.

[0013] The embodiment of the present application determines the above-mentioned first reference voltage, second reference voltage and third reference voltage according to the working mode of the DC power supply circuit, so that the settings of the first reference voltage, the second reference voltage and the third reference voltage can be reasonably adjusted according to the characteristics of different working modes, thereby shortening the regulation speed of the output voltage in the corresponding working mode and further improving the output voltage response speed of the DC power supply circuit.

[0014] Optionally, in some embodiments of the present application, when the DC power supply circuit is in a boost mode,

[0015] The first reference voltage is determined according to the historical first reference voltage of the main switch power supply module in the previous feedback cycle and the boost amount of the current cycle, and the boost amount of the current cycle is determined according to the first difference between the current total output voltage of the DC power supply circuit and the target output voltage;

[0016] The second reference voltage remains unchanged; and

[0017] The third reference voltage is determined according to the voltage boost amount of the current cycle and a historical third reference voltage of the linear power supply module in a previous feedback cycle.

[0018] The embodiment of the present application dynamically adjusts the first reference voltage and the third reference voltage when the DC power supply circuit is in the boost mode, can quickly respond to the deviation between the output voltage and the target output voltage, and effectively improve the ripple of the output voltage, thereby effectively realizing the precise control and rapid regulation of the output voltage. At the same time, the second reference voltage remains unchanged in the boost mode to control the auxiliary output voltage output by the auxiliary switch voltage module to be as small as possible, thereby reducing the overall power consumption of the DC power supply circuit.

[0019] Optionally, in some embodiments of the present application, when the DC power supply circuit is in a voltage regulation mode, the first reference voltage is determined according to a current total output voltage of the DC power supply circuit and a first constant voltage;

[0020] The second reference voltage is determined according to the first constant voltage and the second constant voltage; and

[0021] The third reference voltage is determined according to the current total output voltage of the DC power supply circuit.

[0022] The embodiment of the present application dynamically adjusts the first reference voltage and the third reference voltage when the DC power supply circuit is in the voltage regulation mode, and can respond to the fluctuation of the output voltage and adjust quickly, thereby achieving accurate voltage regulation of the total output voltage and effectively improving the ripple of the total output voltage, thereby improving the stability of the DC power supply circuit. At the same time, in the voltage regulation mode, the second reference voltage is kept constant to control the auxiliary output voltage output by the auxiliary switch voltage module to be as small as possible, thereby effectively filtering out high-frequency noise and reducing the overall power consumption of the DC power supply circuit.

[0023] Optionally, in some embodiments of the present application, when the DC power supply circuit is in a step-down mode,

[0024] The first reference voltage is determined according to the voltage reduction amount of the current cycle and the historical first reference voltage of the main switch power supply module in the previous feedback cycle, and the voltage reduction amount of the current cycle is determined according to the second difference between the current total output voltage of the DC power supply circuit and the target output voltage;

[0025] The second reference voltage is determined according to a historical second reference voltage of the auxiliary switching power supply module in a previous feedback cycle and a third difference, and the third difference is determined according to a current total output voltage of the DC power supply circuit and the historical first reference voltage; and

[0026] The third reference voltage is determined according to a historical third reference voltage of the linear power supply module in a previous feedback cycle and the voltage reduction amount.

[0027] In the embodiment of the present application, when the DC power supply circuit is in the buck mode, by dynamically adjusting the first reference voltage and the third reference voltage, it is possible to quickly respond to the deviation between the output voltage and the target output voltage, and effectively improve the ripple of the output voltage, thereby effectively realizing the precise control and rapid regulation of the output voltage. At the same time, by dynamically adjusting the second reference voltage, the auxiliary switch power supply module can be used to quickly pull down the total output voltage to achieve buck compensation, so that the total output voltage can be quickly reduced to the target output voltage, further improving the output voltage response speed of the DC power supply circuit, and enabling the auxiliary switch power supply module to gradually exit the buck compensation as the main output voltage decreases, thereby improving the adaptability of the DC power supply circuit to respond quickly in the buck mode.

[0028] Optionally, in some embodiments of the present application, the main switch power supply module includes:

[0029] A first push-pull converter, wherein the same-name end of the first coil of the first push-pull converter is connected to the opposite-name end of the second coil of the first push-pull converter, and has a first connection node;

[0030] a first inductor, wherein a first end of the first inductor is connected to the first connection node;

[0031] A first switch tube, wherein a source of the first switch tube is connected to the second end of the first inductor, and a drain of the first switch tube is configured as a positive input end of the main switch power module;

[0032] A second switch tube, wherein the source of the second switch tube is configured as the negative input terminal of the main switch power module, and the drain of the second switch tube is connected to the same-name terminal of the second coil;

[0033] a third switch tube, wherein a source of the third switch tube is connected to a source of the second switch tube, and a drain of the third switch tube is connected to an opposite-name end of the first coil;

[0034] a first diode, wherein a cathode of the first diode is connected to a source of the first switch tube, and an anode of the first diode is connected to a source of the second switch tube;

[0035] A first rectifier bridge, wherein a midpoint of a first bridge arm of the first rectifier bridge is connected to a like-name end of the third coil of the first push-pull converter, and a midpoint of a second bridge arm of the first rectifier bridge is connected to an opposite-name end of the third coil of the first push-pull converter;

[0036] A first capacitor is connected to two ends of a bridge arm of the first rectifier bridge.

[0037] Optionally, in some embodiments of the present application, the auxiliary switching power supply module includes:

[0038] A second push-pull converter, wherein the same-name end of the fourth coil of the second push-pull converter is connected to the opposite-name end of the fifth coil of the second push-pull converter, and has a second connection node;

[0039] a second inductor, wherein a first end of the second inductor is connected to the second connection node;

[0040] a fourth switch tube, wherein a source of the fourth switch tube is connected to the second end of the second inductor, and a drain of the fourth switch tube is configured as a positive input end of the auxiliary switch power supply module;

[0041] a fifth switch tube, wherein the source of the fifth switch tube is configured as the negative input terminal of the auxiliary switch power supply module, and the drain of the fifth switch tube is connected to the opposite-name terminal of the fourth coil;

[0042] a sixth switch tube, wherein a source of the sixth switch tube is connected to a source of the fifth switch tube, and a drain of the sixth switch tube is connected to a same-name end of the fifth coil;

[0043] a second diode, wherein a cathode of the second diode is connected to a source of the fourth switch tube, and an anode of the second diode is connected to a source of the fifth switch tube;

[0044] A second rectifier bridge, wherein a midpoint of a first bridge arm of the second rectifier bridge is connected to an opposite-name end of a sixth coil of the second push-pull converter, and a midpoint of a second bridge arm of the second rectifier bridge is connected to a same-name end of the sixth coil of the second push-pull converter;

[0045] A second capacitor is connected to two ends of a bridge arm of the second rectifier bridge.

[0046] Optionally, in some embodiments of the present application, the linear power supply module includes a seventh switch tube, the drain of the seventh switch tube is connected to the high-voltage side output end of the auxiliary switch power supply module, the source of the seventh switch tube is connected to the negative output end of the DC power supply circuit, and the source of the seventh switch tube is configured as the output end of the linear power supply module.

[0047] The embodiment of the present application effectively reduces the high-frequency ripple of the total output voltage by setting a switch tube between the high-voltage side output terminal of the auxiliary switching power supply module and the negative output terminal of the DC power supply circuit, thereby improving the stability of the DC power supply circuit.

[0048] Optionally, in some embodiments of the present application, the DC power supply circuit further includes a constant current source dummy load module, which is connected between the output end of the linear power supply module and the low-voltage side output end of the auxiliary switching power supply module. The constant current source dummy load module is configured to provide overvoltage protection for the auxiliary switching power supply module and the linear power supply module when the linear output voltage exceeds a preset threshold.

[0049] Wherein, the constant current source dummy load module comprises:

[0050] A dummy load switch tube, wherein the drain of the dummy load switch tube is connected to the output end of the linear power supply module;

[0051] A first resistor, wherein a first end of the first resistor is connected to a gate of the dummy load switch tube;

[0052] a second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor and has a third connection node, and a second end of the second resistor is suitable for connecting to an external driving power supply;

[0053] A detection resistor, wherein a first end of the detection resistor is connected to the source of the dummy load switch tube, and a second end of the detection resistor is connected to the low-voltage side output end of the auxiliary switch power supply module;

[0054] a first zener diode, wherein a cathode of the first zener diode is connected to the third connection node, a reference electrode of the first zener diode is connected to the first end of the detection resistor, and an anode of the first zener diode is connected to the low-voltage side output end of the auxiliary switching power supply module;

[0055] A third resistor, a first end of the third resistor is connected to the output end of the linear power module;

[0056] a fourth resistor, wherein a first end of the fourth resistor is connected to the second end of the third resistor and has a fourth connection node, and a second end of the fourth resistor is connected to the low-voltage side output end of the auxiliary switching power supply module;

[0057] a second voltage stabilizing diode, wherein a cathode of the second voltage stabilizing diode is connected to the fourth connection node;

[0058] A transistor, wherein the base of the transistor is connected to the anode of the second voltage stabilizing diode, and the emitter of the transistor is connected to the second end of the fourth resistor;

[0059] a fifth resistor, wherein a first end of the fifth resistor is connected to the collector of the transistor, and a second end of the fifth resistor is connected to the first end of the detection resistor;

[0060] A sixth resistor, wherein a first end of the sixth resistor is connected to the collector of the transistor, and a second end of the sixth resistor is suitable for connecting to an external driving power supply.

[0061] The embodiment of the present application implements overvoltage protection for the DC power supply circuit through a constant current source dummy load module, and prevents the total output current from backflowing by increasing the dummy load current to ensure that the output current of the linear power supply module can be output in a forward direction, thereby protecting the auxiliary switching power supply module and the linear power supply module from being damaged by the high-voltage output of the main switching power supply module, and being able to have a self-protection function when the thruster output is ignited, thereby improving the reliability of the DC power supply circuit.

[0062] In addition, the embodiment of the present application forms a dummy load through a dummy load switch tube and its peripheral circuit, and by setting the above-mentioned transistor and its peripheral circuit, the transistor can be turned on when the total output voltage is too large to achieve parallel connection of the detection resistor and the fifth resistor, thereby reducing the line resistance of the dummy load, thereby achieving an increase in the dummy load current, so as to protect the auxiliary switching power supply module and the linear power supply module from being damaged by the high-voltage output of the main switching power supply module, thereby improving the reliability of the DC power supply circuit.

[0063] In a second aspect, an embodiment of the present application provides a thruster, comprising:

[0064] load;

[0065] And according to the DC power supply circuit described in the above embodiment, the DC power supply circuit is used to supply power to the load.

[0066] The thruster proposed in the embodiment of the present application adjusts the output voltage through the DC power supply circuit with a multi-power supply coordinated response mechanism, thereby shortening the adjustment time of the output voltage of the DC power supply circuit, improving the output voltage response speed of the DC power supply circuit, and reducing the output voltage ripple of the DC power supply circuit, greatly improving the stability of the DC power supply circuit. In addition, the DC power supply circuit proposed in the embodiment of the present application can reduce the high-voltage auxiliary source circuit in the device, thereby reducing the volume of the output capacitor and reducing the circuit cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0068] Figure 1 A schematic diagram of a DC power supply circuit with multiple power sources coordinating and responding quickly proposed in one embodiment of the present application;

[0069] Figure 2 A schematic diagram of the structure of a DC power supply circuit with multiple power sources coordinating and responding quickly proposed in another embodiment of the present application;

[0070] Figure 3 A circuit diagram of a DC power supply circuit proposed in an embodiment of the present application;

[0071] Figure 4 A circuit diagram of a constant current source dummy load module proposed in an embodiment of the present application;

[0072] Figure 5 This is a schematic diagram of the structure of the thruster proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0074] Thrusters are widely used in spacecraft equipment for deep space exploration missions. The thrusters can be used to adjust the orbit and attitude of the spacecraft. In order to meet the changes in the power demand of the thrusters under different working conditions, the thruster power supply is often required to have the ability to continuously track the output voltage waveform and respond quickly under extremely light load conditions. However, due to the special cosmic environment of deep space exploration missions, for example, there are often large temperature changes from the ground environment to the high-altitude environment. Therefore, due to the limitations of this extreme cosmic environment on materials, it is difficult to set a high-voltage MOSFET tube on the secondary high-voltage rectifier side of the thruster power supply to achieve bidirectional energy flow. This limitation leads to the lack of effective and rapid adjustment means for the thruster power supply when the output voltage fluctuates, thus affecting the response speed of the thruster power supply.

[0075] In the related art, the phase margin and response speed of the thruster power supply are generally improved by adjusting the control strategy of the thruster power supply. The control strategy usually improves the response performance by introducing phase compensation without changing the topology of the power supply system. However, the control strategy can only be adjusted within the bandwidth determined by the power supply topology, so the control strategy has limited effect on improving the response speed. In addition, in the extremely light load application scenario of the thruster power supply, if the load of the power supply is a large resistance or a small current, even if the switch tube of the power supply is completely turned off, the output voltage of the power supply cannot drop quickly. Therefore, the related art has limitations in improving the response speed, and it is difficult to meet the requirements of the tiny thruster power supply for rapid voltage response, which in turn affects the working effect of the thruster.

[0076] In an embodiment of the present application, a DC power supply circuit 10 with multiple power sources coordinating and responding quickly is provided. The DC power supply circuit 10 can be used for aerospace electric thruster power supplies, and can also be used in power supply systems that require high voltage, high precision and fast response, such as medical laser power supplies and semiconductor manufacturing power supplies.

[0077] like Figure 1 As shown, the DC power supply circuit 10 proposed in the embodiment of the present application includes a main switching power supply module 100, an auxiliary switching power supply module 200 and a linear power supply module 300;

[0078] The main switch power supply module 100 is configured to be based on the first reference voltage V REF1 The input voltage V in Convert to main output voltage;

[0079] The low-voltage side output terminal M-GNG of the auxiliary switching power supply module 200 is connected to the low-voltage side output terminal M-GNG of the main switching power supply module 100, and the auxiliary switching power supply module 200 is configured to generate a voltage according to the second reference voltage V REF2 Convert input voltage into auxiliary output voltage;

[0080] The linear power supply module 300 is connected between the high-voltage side output terminal of the auxiliary switching power supply module 100 and the negative output terminal of the DC power supply circuit 10. The linear power supply module 300 is configured to generate a voltage according to the third reference voltage V REF3 Output linear output voltage;

[0081] The high voltage side output terminal of the main switch power supply module 100 and the negative output terminal of the DC power supply circuit 10 are suitable for connecting a load R L , the auxiliary output voltage and the linear output voltage are used to regulate the main output voltage to the load R L powered by.

[0082] It should be noted that, in the embodiment of the present application, the main switch power supply module 100 is responsible for the high voltage and main power output, and the auxiliary switch power supply module 200 is combined with the linear power supply module 300 to form a negative pressure regulation part, that is, the main switch power supply module 100, the auxiliary switch power supply module 200 and the linear power supply module 300 are respectively responsible for the DC power supply circuit 10 to the load R L A part of the total output voltage of the power supply is used, and the output voltage ripple of the DC power supply circuit 10 is suppressed by setting the linear power supply module 300, wherein the high-voltage side output end of the main switching power supply module 100 serves as the positive output end OUT+ of the DC power supply circuit 10, and the output end of the linear power supply module 300 serves as the negative output end OUT- of the DC power supply circuit 10.

[0083] The high-voltage side output terminal of the main switching power supply module 100 is configured as the positive output terminal of the DC power supply circuit 10, and the output terminal of the linear power supply module 300 is configured as the negative output terminal of the DC power supply circuit 10. An output capacitor C is connected between the positive output terminal and the negative output terminal of the DC power supply circuit 10. o , and the output capacitor C o The two ends of the parallel load R L In addition, the low-voltage side output terminal of the auxiliary switching power supply module 200 and the low-voltage side output terminal of the main switching power supply module 100 are connected to form a positive-negative-negative-positive connection structure, thereby realizing negative regulation of the main output voltage, so as to shorten the regulation time of the total output voltage of the DC power supply circuit and improve the response speed of the DC power supply circuit.

[0084] Therefore, the DC power supply circuit 10 provided in this embodiment forms a multi-power coordinated response mechanism through the main switching power supply module 100, the auxiliary switching power supply module 200 and the linear power supply module 300. Through the connection relationship between the low-voltage side output end of the auxiliary switching power supply module 200 and the low-voltage side output end of the main switching power supply module 100, the output end of the main switching power supply module 100 and the output end of the auxiliary switching power supply module 200 are reversely connected, so that the main output voltage is adjusted by using the auxiliary output voltage and the linear output voltage to provide the load R L Power supply. Therefore, the embodiment of the present application, through the connection relationship between the low-voltage side output terminal of the auxiliary switching power supply module 200 and the low-voltage side output terminal of the main switching power supply module 100, enables the auxiliary output voltage to be combined with the linear output voltage to reversely regulate the main output voltage, thereby shortening the adjustment time of the output voltage of the DC power supply circuit, improving the output voltage response speed of the DC power supply circuit, and the auxiliary switching power supply module 200 combined with the linear power supply module 300 can reduce the output voltage ripple of the DC power supply circuit, greatly improving the stability of the DC power supply circuit. In addition, the DC power supply circuit proposed in the embodiment of the present application can reduce the high-voltage auxiliary source circuit in the device, thereby reducing the volume of the output capacitor and reducing the circuit cost.

[0085] In some embodiments of the present application, the first reference voltage, the second reference voltage and the third reference voltage are respectively determined according to the working mode of the DC power supply circuit 10 .

[0086] The embodiment of the present application determines the above-mentioned first reference voltage, second reference voltage and third reference voltage according to the working mode of the DC power supply circuit, so that the settings of the first reference voltage, the second reference voltage and the third reference voltage can be reasonably adjusted according to the characteristics of different working modes, thereby shortening the regulation speed of the output voltage in the corresponding working mode and further improving the output voltage response speed of the DC power supply circuit.

[0087] Specifically, the working modes of the DC power supply circuit 10 include a boost mode, a regulated mode and a buck mode. The following describes the determination processes of the first reference voltage, the second reference voltage and the third reference voltage corresponding to the above three working modes.

[0088] In some embodiments of the present application, when the DC power supply circuit 10 is in the boost mode, the first reference voltage is determined according to the historical first reference voltage of the main switching power supply module 100 in the previous feedback cycle and the boost amount of the current cycle, and the boost amount of the current cycle is determined according to the first difference between the current total output voltage of the DC power supply circuit 10 and the target output voltage, that is, the first reference voltage is determined according to the following formula (1):

[0089] V REF1 =V REF1 T-1 +V t =V REF1 T-1 +(V a -V o ) Formula (1)

[0090] Where V REF1 is the first reference voltage to be determined, that is, the first reference voltage in the next feedback cycle T, V REF1 T-1 is the historical first reference voltage of the previous feedback cycle T-1, V t is the boost amount of the current cycle, V a is the target output voltage in boost mode, V o is the current total output voltage of the DC power supply circuit 10.

[0091] The second reference voltage remains unchanged, that is, the second reference voltage is determined according to the following formula (2):

[0092] V REF2 =V REF2 T-1 Formula (2)

[0093] Where V REF2 The second reference voltage to be determined is the second reference voltage in the next feedback cycle T, V REF2 T-1 It is the historical second reference voltage of the previous feedback cycle T-1.

[0094] The third reference voltage is determined according to the boost amount of the current cycle and the historical third reference voltage of the linear power supply module 300 in the previous feedback cycle, that is, the third reference voltage is determined according to the following formula (3):

[0095] V REF3 =V REF3 T-1 +V t =V REF3 T-1 +(V a -V o ) Formula (3)

[0096] Where V REF3 is the third reference voltage to be determined, i.e., the third reference voltage in the next feedback cycle T, V REF3 T-1 It is the historical third reference voltage of the previous feedback cycle T-1.

[0097] Since the load R of the DC power supply circuit 10 for the micro-thruster L It is a light load, and the output voltage can meet the fast rising response requirement in the boost mode. Therefore, in the boost mode, there is no need for the auxiliary switching power supply 200 to provide excessive voltage regulation for the main output voltage. It is only necessary to control the auxiliary output voltage of the auxiliary switching power supply 200 to be as small as possible, so as to reduce power consumption while achieving voltage tracking.

[0098] Therefore, in the embodiment of the present application, the first reference voltage V is dynamically adjusted when the DC power supply circuit is in the boost mode. oEF1 and the third reference voltage V REF3 , can quickly respond to the output voltage V o and the target output voltage V a The deviation of the output voltage can be effectively improved, thereby effectively realizing the precise control and rapid regulation of the output voltage. At the same time, the second reference voltage remains unchanged in the boost mode to control the auxiliary output voltage output by the auxiliary switch voltage module to be as small as possible, thereby reducing the overall power consumption of the DC power supply circuit.

[0099] In some embodiments of the present application, when the DC power supply circuit 10 is in the voltage regulation mode, the first reference voltage is determined according to the current total output voltage of the DC power supply circuit 10 and the first constant voltage, that is, the first reference voltage is determined according to the following formula (4):

[0100] V REF1 =V o +V1 formula (4)

[0101] In the formula, V1 is the first constant voltage, wherein V1 is set according to the actual working condition of the circuit, and the smaller V1 is, the smaller the circuit loss is.

[0102] The second reference voltage is determined according to the first constant voltage and the second constant voltage, that is, the second reference voltage is determined according to the following formula (5):

[0103] V REF2 =V1+V2 Formula (5)

[0104] Wherein, V2 is the second constant voltage, wherein V2 is set according to the actual working condition of the circuit, and the setting of V2 can provide a certain margin to cope with the interference of high-frequency ripple on the total output voltage.

[0105] The third reference voltage is determined according to the current total output voltage of the DC power supply circuit 10, that is, the third reference voltage is determined according to the following formula (6):

[0106] V REF3 =V o Formula (6)

[0107] In the voltage regulation mode, since there is no need to adjust the output voltage significantly, it is only necessary to control the auxiliary output voltage of the auxiliary switching power supply 200 to be as small as possible and maintain a stable output, so as to reduce power consumption while filtering out high-frequency noise, and ensure that the main switching power supply module 100 and the linear power supply module 300 track the current total output voltage to achieve the purpose of supplying the load R L Stable power supply.

[0108] Therefore, the embodiment of the present application dynamically adjusts the first reference voltage and the third reference voltage when the DC power supply circuit 10 is in the voltage regulation mode, and can respond to the fluctuation of the output voltage and adjust quickly, thereby achieving accurate voltage regulation of the total output voltage and effectively improving the ripple of the total output voltage, thereby improving the stability of the DC power supply circuit 10. At the same time, in the voltage regulation mode, the second reference voltage is kept constant to control the auxiliary output voltage output by the auxiliary switch voltage module 200 to be as small as possible, thereby effectively filtering out high-frequency noise and reducing the overall power consumption of the DC power supply circuit 10.

[0109] In some embodiments of the present application, when the DC power supply circuit 10 is in the buck mode, the first reference voltage is determined according to the buck amount of the current cycle and the historical first reference voltage of the main switching power supply module 100 in the previous feedback cycle, and the buck amount of the current cycle is determined according to the second difference between the current total output voltage of the DC power supply circuit 10 and the target output voltage, that is, the first reference voltage is determined according to the following formula (7):

[0110] V REF1 =V REF1 T-1 -V d =V REF1 T-1 -(V o -V b ) Formula (7)

[0111] Where V d is the voltage reduction in the current cycle, V b is the target output voltage in buck mode.

[0112] The second reference voltage is determined according to the historical second reference voltage of the auxiliary switching power supply module 200 in the previous feedback cycle and the third difference, and the third difference is determined according to the current total output voltage of the DC power supply circuit 10 and the historical first reference voltage, that is, the second reference voltage is determined according to the following formula (8):

[0113] V REf2 =V REF2 T-1 +(V o -V REF1 T-1 ) Formula (8)

[0114] Where V o -V REF1 T-1 is the third difference mentioned above.

[0115] The third reference voltage is determined according to the historical third reference voltage of the linear power supply module 300 in the previous feedback cycle and the above-mentioned voltage reduction amount, that is, the third reference voltage is determined according to the following formula (9):

[0116] V REF3 =V REF3 T-1 -V d =V REF1 T-1 -(V o -V b ) Formula (9)

[0117] Since the load R of the DC power supply circuit 10 for the micro-thruster LThe main output voltage may not drop quickly in the buck mode. Therefore, the auxiliary switching power supply module 200 is required to output an equivalent negative voltage in combination with the linear power supply module 300 to quickly pull down the total output voltage, so that the total output voltage is quickly reduced to the expected value in the output form, V REF2 With V REF1 T-1 Therefore, the auxiliary switching power supply module can gradually exit the voltage reduction compensation as the main output voltage decreases.

[0118] Therefore, in the embodiment of the present application, when the DC power supply circuit is in the buck mode, by dynamically adjusting the first reference voltage and the third reference voltage, it is possible to quickly respond to the deviation between the output voltage and the target output voltage, and effectively improve the ripple of the output voltage, thereby effectively realizing the precise control and rapid regulation of the output voltage. At the same time, by dynamically adjusting the second reference voltage, the auxiliary switch power supply module can be used to quickly pull down the total output voltage to achieve buck compensation, so that the total output voltage can be quickly reduced to the target output voltage, further improving the output voltage response speed of the DC power supply circuit, and enabling the auxiliary switch power supply module to gradually exit the buck compensation as the main output voltage decreases, thereby improving the adaptability of the DC power supply circuit to respond quickly in the buck mode.

[0119] In some embodiments of the present application, Figure 2 As shown, the DC power supply circuit also includes a constant current source dummy load module 400, which is connected between the output end of the linear power supply module 300 and the low-voltage side output end of the auxiliary switching power supply module 200, and the constant current source dummy load module 400 is configured to provide overvoltage protection for the auxiliary switching power supply module 200 and the linear power supply module 300 when the linear output voltage exceeds a preset threshold.

[0120] The embodiment of the present application implements overvoltage protection for the DC power supply circuit 10 through a constant current source dummy load module 400, and prevents the total output current from backflowing by increasing the dummy load current to ensure that the output current of the linear power supply module 300 can be output in a forward direction, thereby protecting the auxiliary switching power supply module 200 and the linear power supply module 300 from being damaged by the high-voltage output of the main switching power supply module 100, and being able to have a self-protection function when the thruster output is ignited, thereby improving the reliability of the DC power supply circuit 10.

[0121] like Figure 3 As shown, in some embodiments of the present application, the main switching power supply module 100 includes a first push-pull converter T m , the first inductor L m1 , the first switch tube Q m1 , the second switch tube Q m2 , the third switch tube Q m3, the first diode D m1 , the first rectifier bridge 110 and the first capacitor C m1 .

[0122] Among them, the first push-pull converter T m The first coil N m1 The same-name end of the first push-pull converter T m The second coil N m2 The first inductor L m1 The first end of the first switch tube Q is connected to the first connection node; m1 The source of the first inductor L is connected m1 The second end of the first switch tube Q m1 The drain of the second switch tube Q is configured as the positive input terminal of the main switch power module 100; m2 The source of is configured as the negative input terminal of the main switch power module 100, and the second switch tube Q m2 The drain of the second coil N is connected m2 The same-name terminal of the third switch tube Q m3 The source of the second switch tube Q m2 The source of the third switch tube Q m3 The drain of the first coil N is connected m1 The opposite end of the first diode D m1 The cathode of the first switching tube is connected to the source of the first diode D m1 The anode of the second switch tube Q m2 The midpoint of the first bridge arm of the first rectifier bridge 110 is connected to the first push-pull converter T m The third coil N m3 The middle point of the second bridge arm of the first rectifier bridge 110 is connected to the first push-pull converter T m The third coil N m3 The opposite end of the first capacitor C m1 Connected to two ends of the bridge arm of the first rectifier bridge 110 .

[0123] The first rectifier bridge 110 is composed of a diode D m2 、Diode D m3 、Diode D m4 And diode D m5 constitute.

[0124] In the embodiment of the present application, the input voltage V in Connect to the first switch tube Q m1 The drain and the first diode D m1 and controls the first switch tube Q m1 , the second switch tube Q m2 , the third switch tube Qm3 The turn-on and turn-off of the first push-pull converter T m The input voltage V in The voltage is stepped up, stepped down or stabilized, and the first push-pull converter T m The first rectifier bridge 110 and the first capacitor C on the secondary side m1 The voltage is rectified and filtered to output the above main output voltage.

[0125] It should be noted that the main switch power supply module 100 proposed in the embodiment of the present application adopts a conventional feedback loop to connect the first switch tube Q m1 , the second switch tube Q m2 And the third switch tube Q m3 The gate electrode shown in the embodiment of the present application Figure 3 The main output voltage of the main switch power supply module 100 is used as the first closed-loop feedback voltage, and the first switch tube Q is controlled according to the first closed-loop feedback voltage and the first reference voltage. m1 , the second switch tube Q m2 And the third switch tube Q m3 The main output voltage can be regulated by turning on and off.

[0126] like Figure 3 As shown, in some embodiments of the present application, the auxiliary switching power supply module 200 includes a second push-pull converter T a , the second inductor L a1 , the fourth switch tube Q a1 、The fifth switch tube Q a2 , the sixth switch tube Q a3 , the second diode D a1 , the second rectifier bridge 210 and the second capacitor C a1 .

[0127] The second push-pull converter T a The fourth coil N a1 The same-name end is connected to the second push-pull converter T a The fifth coil N a2 The second inductor L a1 The first end of the fourth switch tube Q is connected to the second connection node; a1 The source of the second inductor L a1 The second end of the fourth switch tube Q a1 The drain of the fifth switch tube Q is configured as the positive input terminal of the auxiliary switch power supply module 200; a2 The source of the fifth switch tube Q is configured as the negative input terminal of the auxiliary switch power module 200. a2 The drain of the fourth coil N is connected a1 The opposite end of the sixth switch tube Qa3 The source of the fifth switch tube Q a2 The source of the sixth switch tube Q a3 The drain of the fifth coil N is connected a2 The same-name end of the second diode D a1 The cathode of the fourth switch tube Q a1 The source of the second diode D a1 The anode of the fifth switch tube Q a2 The source of

[0128] The midpoint of the first bridge arm of the second rectifier bridge 210 is connected to the second push-pull converter T a The sixth coil N a3 The middle point of the second bridge arm of the second rectifier bridge 210 is connected to the second push-pull converter T a The sixth coil N a3 The same-name terminal; the second capacitor C a1 Connected to the two ends of the bridge arm of the second rectifier bridge 210 .

[0129] The second rectifier bridge 210 is composed of a diode D a2 、Diode D a3 、Diode D a4 And diode D a5 constitute.

[0130] In the embodiment of the present application, the input voltage V in Connect the fourth switch tube Q a1 The drain of the second diode D a1 and through controlling the fourth switch tube Q a1 、The fifth switch tube Q a2 , the sixth switch tube Q a3 The turn-on and turn-off of the second push-pull converter T a The input voltage V in The voltage is stepped up, stepped down or stabilized, and the first push-pull converter T m The first rectifier bridge 110 and the first capacitor C on the secondary side m1 The voltage is rectified and filtered to output the above main output voltage.

[0131] It should be noted that the auxiliary switch power supply module 200 proposed in the embodiment of the present application adopts a conventional feedback loop to connect the fourth switch tube Q a1 、The fifth switch tube Q a2 And the sixth switch tube Q a3 The gate electrode shown in the embodiment of the present application Figure 3 The auxiliary output voltage of the auxiliary switch power supply module 200 is used as the second closed-loop feedback voltage, and the fourth switch tube Q is controlled according to the second closed-loop feedback voltage and the second reference voltage.a1 、The fifth switch tube Q a2 And the sixth switch tube Q a3 The auxiliary output voltage can be regulated and controlled by turning on and off the auxiliary output voltage.

[0132] like Figure 3 As shown, in some embodiments of the present application, the linear power supply module 300 includes a seventh switch tube Q L1 , where the seventh switch tube Q L1 The drain of the seventh switch tube Q is connected to the high-voltage side output terminal of the auxiliary switch power supply module 200. L1 The source of the seventh switch tube Q is connected to the negative output terminal of the DC power supply circuit 10, and the seventh switch tube Q L1 The source of is configured as the output end of the linear power supply module 300 .

[0133] It should be noted that the linear power supply module 300 proposed in the embodiment of the present application adopts a conventional feedback loop to connect the seventh switch tube Q L1 The gate electrode shown in the embodiment of the present application Figure 3 The seventh switch tube Q is controlled according to the third closed-loop feedback voltage and the third reference voltage. L1 The conduction and shutdown of the circuit can realize the regulation and control of the linear output voltage.

[0134] Therefore, the embodiment of the present application effectively reduces the high-frequency ripple of the total output voltage by setting a switch tube between the high-voltage side output terminal of the auxiliary switching power supply module and the negative output terminal of the DC power supply circuit, thereby improving the stability and reliability of the DC power supply circuit 10. L1 It is connected between the high-voltage side output terminal of the auxiliary switching power supply module 200 and the low-voltage side of the DC power supply circuit 10, so that the total output voltage can be directly adjusted on the low-voltage output side of the DC power supply circuit 10, thereby reducing the setting of the high-voltage auxiliary source circuit in the DC power supply circuit, reducing the volume of the output capacitor, and greatly reducing the cost of the DC power supply circuit 10.

[0135] Furthermore, if Figure 4 As shown, the constant current source dummy load module 400 includes a dummy load switch tube Q L2 , first resistor R1, second resistor R2, detection resistor R s , a first voltage zener diode D1, a third resistor R3, a fourth resistor R4, a second voltage zener diode D2, a transistor T1, a fifth resistor R5 and a sixth resistor R6.

[0136] Among them, the dummy load switch tube Q L2 The drain of the first resistor R1 is connected to the output end of the linear power module 300; the first end of the first resistor R1 is connected to the dummy load switch tube QL2 The first end of the second resistor R2 is connected to the second end of the first resistor R1 and has a third connection node, and the second end of the second resistor R2 is suitable for connecting to the external driving power supply U 12V ; Detection resistor R s The first end is connected to the dummy load switch tube Q L2 The source of the sense resistor R s The second end of is connected to the low voltage side output end of the auxiliary switching power supply module 200; the cathode of the first voltage stabilizing diode D1 is connected to the third connection node, and the reference electrode of the first voltage stabilizing diode D1 is connected to the detection resistor R s The first end of the first voltage stabilizing diode D1 is connected to the low-voltage side output end of the auxiliary switching power supply module 200; the first end of the third resistor R3 is connected to the output end of the linear power supply module 300; the first end of the fourth resistor R4 is connected to the second end of the third resistor R3 and has a fourth connection node, and the second end of the fourth resistor R4 is connected to the low-voltage side output end of the auxiliary switching power supply module 200; the cathode of the second voltage stabilizing diode D2 is connected to the fourth connection node; the base of the transistor T1 is connected to the anode of the second voltage stabilizing diode D2, and the emitter of the transistor T1 is connected to the second end of the fourth resistor R4; the first end of the fifth resistor R5 is connected to the collector of the transistor T1, and the second end of the fifth resistor R5 is connected to the detection resistor R s The first end of the sixth resistor R6 is connected to the collector of the transistor T1, and the second end of the sixth resistor R6 is suitable for connecting to an external drive power supply U 12V .

[0137] In the embodiment of the present application, the model of the first voltage stabilizing diode D1 is TL431.

[0138] It should be noted that Figure 4 The V O2 is the linear output voltage of the linear power module 300, V out The main output voltage outputted from the high-voltage side output terminal of the main switching power supply module 100, the dummy load switch tube Q L2 The source is sensed by the resistor R s Connect the low voltage side output terminal M-GNG of the auxiliary switch power supply module 200, the dummy load switch tube Q L2 The drain is connected to the output end of the linear power module and grounded.

[0139] Specifically, the constant current source dummy load module 400 is used to provide overvoltage protection for the DC power supply circuit to ensure that the auxiliary switch power supply module 200 and the linear power supply module 300 will not be damaged by the high voltage output by the main switch power supply module 100. According to Kirchhoff's current law, only the current I flowing through the dummy load DL Greater than the load R L The total output current I O1, the linear power module 300 can output the positive current I O2 Otherwise, if the current I flowing through the dummy load DL Less than the total output current I O1 , the linear output voltage V of the linear power module 300 O2 Too high will cause the total output current I O1 Therefore, the mechanism of the constant current source dummy load module 400 in the embodiment of the present application to improve overvoltage protection is to ensure that the linear power supply module 300 outputs a positive current I O2 , that is, the output current I of the linear power module 300 O2 The direction of the power always keeps flowing from the output end of the linear power module 300 to the negative output end of the DC power circuit 10 (such as Figure 4 Medium output current I O2 corresponding arrows).

[0140] Furthermore, the dummy load switch tube Q L2 The first resistor R1, the second resistor R2, and the detection resistor R s The peripheral circuit composed of the first voltage zener diode D1 together constitutes a dummy load, and the transistor T1 and the peripheral circuit composed of the third resistor R3, the fourth resistor R4, the second voltage zener diode D2, the fifth resistor R5, and the sixth resistor R6 together constitute a protection circuit. O2 When the preset threshold is exceeded, transistor T1 is turned on, thereby making the detection resistor R s The fifth resistor R5 is connected in parallel, thereby reducing the overall resistance of the dummy load, thereby increasing the current I flowing through the dummy load. DL .

[0141] Therefore, the embodiment of the present application uses a dummy load switch tube Q L2 and its peripheral circuits constitute a dummy load, and by arranging the above-mentioned transistor and its peripheral circuits, the transistor can be turned on when the total output voltage is too large to realize the parallel connection of the detection resistor and the fifth resistor, thereby reducing the line resistance of the dummy load, thereby realizing the increase of the dummy load current, so as to protect the auxiliary switching power supply module and the linear power supply module 300 from being damaged by the high-voltage end output of the main switching power supply module 100, thereby improving the reliability of the DC power supply circuit 10.

[0142] Accordingly, please refer to Figure 5 The present application also provides a thruster 1, comprising:

[0143] Load R L ;

[0144] According to the DC power supply circuit 10 described in the above embodiment, the DC power supply circuit 10 is used to supply power to the load RL Provide power supply.

[0145] The specific configuration of each of the above modules and units and further functional description are the same as those of the above corresponding embodiments and will not be repeated here.

[0146] The thruster 1 proposed in the embodiment of the present application adjusts the output voltage through the DC power supply circuit 10 with a multi-power coordinated response mechanism, thereby shortening the adjustment time of the output voltage of the DC power supply circuit 10, improving the output voltage response speed of the DC power supply circuit 10, and reducing the output voltage ripple of the DC power supply circuit 10, greatly improving the stability of the DC power supply circuit 10. In addition, the DC power supply circuit 10 proposed in the embodiment of the present application can reduce the high-voltage auxiliary source circuit in the device, thereby reducing the volume of the output capacitor and reducing the circuit cost.

[0147] For the convenience of description, the above device is described in various units according to their functions. Of course, when implementing the present application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0148] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0149] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0150] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0151] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A DC power supply circuit with multiple power sources coordinating and responding quickly, characterized in that: The DC power supply circuit comprises: a main switching power supply module, the main switching power supply module being configured to convert an input voltage into a main output voltage according to a first reference voltage; an auxiliary switching power supply module, wherein a low-voltage side output terminal of the auxiliary switching power supply module is connected to a low-voltage side output terminal of the main switching power supply module, and the auxiliary switching power supply module is configured to convert the input voltage into an auxiliary output voltage according to a second reference voltage; A linear power supply module, the linear power supply module is connected between the high-voltage side output terminal of the auxiliary switching power supply module and the negative output terminal of the DC power supply circuit, the linear power supply module is configured to output a linear output voltage according to a third reference voltage; Among them, a load is suitable for connecting between the high-voltage side output terminal of the main switching power supply module and the negative output terminal of the DC power supply circuit, and the auxiliary output voltage and the linear output voltage are used to adjust the main output voltage to power the load.

2. The DC power supply circuit according to claim 1, characterized in that: The first reference voltage, the second reference voltage and the third reference voltage are respectively determined according to the working mode of the DC power supply circuit.

3. The DC power supply circuit according to claim 2, characterized in that: When the DC power supply circuit is in boost mode, The first reference voltage is determined according to the historical first reference voltage of the main switch power supply module in the previous feedback cycle and the boost amount of the current cycle, and the boost amount of the current cycle is determined according to the first difference between the current total output voltage of the DC power supply circuit and the target output voltage; The second reference voltage remains unchanged; as well as The third reference voltage is determined according to the voltage boost amount of the current cycle and a historical third reference voltage of the linear power supply module in a previous feedback cycle.

4. The DC power supply circuit according to claim 2, characterized in that: When the DC power supply circuit is in a voltage regulation mode, The first reference voltage is determined according to the current total output voltage of the DC power supply circuit and the first constant voltage; The second reference voltage is determined according to the first constant voltage and the second constant voltage; and The third reference voltage is determined according to the current total output voltage of the DC power supply circuit.

5. The DC power supply circuit according to claim 2, characterized in that: When the DC power supply circuit is in step-down mode, The first reference voltage is determined according to the voltage reduction amount of the current cycle and the historical first reference voltage of the main switch power supply module in the previous feedback cycle, and the voltage reduction amount of the current cycle is determined according to the second difference between the current total output voltage of the DC power supply circuit and the target output voltage; The second reference voltage is determined according to a historical second reference voltage of the auxiliary switching power supply module in a previous feedback cycle and a third difference, and the third difference is determined according to a current total output voltage of the DC power supply circuit and the historical first reference voltage; and The third reference voltage is determined according to a historical third reference voltage of the linear power supply module in a previous feedback cycle and the voltage reduction amount.

6. The DC power supply circuit according to any one of claims 1 to 5, characterized in that: The main switch power supply module comprises: A first push-pull converter, wherein the same-name end of the first coil of the first push-pull converter is connected to the opposite-name end of the second coil of the first push-pull converter, and has a first connection node; a first inductor, wherein a first end of the first inductor is connected to the first connection node; A first switch tube, wherein a source of the first switch tube is connected to the second end of the first inductor, and a drain of the first switch tube is configured as a positive input end of the main switch power module; A second switch tube, wherein the source of the second switch tube is configured as the negative input terminal of the main switch power module, and the drain of the second switch tube is connected to the same-name terminal of the second coil; a third switch tube, wherein a source of the third switch tube is connected to a source of the second switch tube, and a drain of the third switch tube is connected to an opposite-name end of the first coil; a first diode, wherein a cathode of the first diode is connected to a source of the first switch tube, and an anode of the first diode is connected to a source of the second switch tube; A first rectifier bridge, wherein a midpoint of a first bridge arm of the first rectifier bridge is connected to a like-name end of the third coil of the first push-pull converter, and a midpoint of a second bridge arm of the first rectifier bridge is connected to an opposite-name end of the third coil of the first push-pull converter; A first capacitor is connected to two ends of a bridge arm of the first rectifier bridge.

7. The DC power supply circuit according to any one of claims 1 to 5, characterized in that: The auxiliary switch power supply module comprises: A second push-pull converter, wherein the same-name end of the fourth coil of the second push-pull converter is connected to the opposite-name end of the fifth coil of the second push-pull converter, and has a second connection node; a second inductor, wherein a first end of the second inductor is connected to the second connection node; a fourth switch tube, wherein a source of the fourth switch tube is connected to the second end of the second inductor, and a drain of the fourth switch tube is configured as a positive input end of the auxiliary switch power supply module; a fifth switch tube, wherein the source of the fifth switch tube is configured as the negative input terminal of the auxiliary switch power supply module, and the drain of the fifth switch tube is connected to the opposite-name terminal of the fourth coil; a sixth switch tube, wherein a source of the sixth switch tube is connected to a source of the fifth switch tube, and a drain of the sixth switch tube is connected to a same-name end of the fifth coil; a second diode, wherein a cathode of the second diode is connected to a source of the fourth switch tube, and an anode of the second diode is connected to a source of the fifth switch tube; A second rectifier bridge, wherein a midpoint of a first bridge arm of the second rectifier bridge is connected to an opposite-name end of a sixth coil of the second push-pull converter, and a midpoint of a second bridge arm of the second rectifier bridge is connected to a same-name end of the sixth coil of the second push-pull converter; A second capacitor is connected to two ends of a bridge arm of the second rectifier bridge.

8. The DC power supply circuit according to any one of claims 7, characterized in that: The linear power supply module includes a seventh switch tube, the drain of the seventh switch tube is connected to the high-voltage side output end of the auxiliary switch power supply module, the source of the seventh switch tube is connected to the negative output end of the DC power supply circuit, and the source of the seventh switch tube is configured as the output end of the linear power supply module.

9. The DC power supply circuit according to claim 1, characterized in that: The DC power supply circuit further includes a constant current source dummy load module, which is connected between the output end of the linear power supply module and the low-voltage side output end of the auxiliary switch power supply module, and is configured to provide overvoltage protection for the auxiliary switch power supply module and the linear power supply module when the linear output voltage exceeds a preset threshold; Wherein, the constant current source dummy load module comprises: A dummy load switch tube, wherein the drain of the dummy load switch tube is connected to the output end of the linear power supply module; A first resistor, wherein a first end of the first resistor is connected to a gate of the dummy load switch tube; a second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor and has a third connection node, and a second end of the second resistor is suitable for connecting to an external driving power supply; A detection resistor, wherein a first end of the detection resistor is connected to the source of the dummy load switch tube, and a second end of the detection resistor is connected to the low-voltage side output end of the auxiliary switch power supply module; a first zener diode, wherein a cathode of the first zener diode is connected to the third connection node, a reference electrode of the first zener diode is connected to the first end of the detection resistor, and an anode of the first zener diode is connected to the low-voltage side output end of the auxiliary switching power supply module; A third resistor, a first end of the third resistor is connected to the output end of the linear power module; a fourth resistor, wherein a first end of the fourth resistor is connected to the second end of the third resistor and has a fourth connection node, and a second end of the fourth resistor is connected to the low-voltage side output end of the auxiliary switching power supply module; a second voltage stabilizing diode, wherein a cathode of the second voltage stabilizing diode is connected to the fourth connection node; A transistor, wherein the base of the transistor is connected to the anode of the second voltage stabilizing diode, and the emitter of the transistor is connected to the second end of the fourth resistor; a fifth resistor, wherein a first end of the fifth resistor is connected to the collector of the transistor, and a second end of the fifth resistor is connected to the first end of the detection resistor; A sixth resistor, wherein a first end of the sixth resistor is connected to the collector of the transistor, and a second end of the sixth resistor is suitable for connecting to an external driving power supply.

10. A thruster, characterized in that: The thruster comprises: load; And the DC power supply circuit according to any one of claims 1 to 9 above, the DC power supply circuit is used to supply power to the load.

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