Stable power supply device for airborne multispectral photoelectric system

Abstract

The utility model relates to a stable power supply device for an airborne multispectral photoelectric system. The stable power supply device comprises an input filtering anti-reverse circuit, a peak surge suppression circuit, a DC-DC conversion circuit, a voltage acquisition reporting circuit and an output filtering circuit which are connected in sequence, the peak surge suppression circuit comprises a normal switching stage peak loop, an input power supply switching power-on loop and an ultrahigh peak power supply loop. The DC-DC conversion circuit comprises a first path of non-isolated output P1 and a second path of isolated output P2. According to the stable power supply device, on one hand, the dynamic response of the power supply is improved, the stability of the power supply is greatly improved, and meanwhile, the output precision and the anti-interference capability are improved.

Description

Technical Field

[0001] This utility model relates to the field of optoelectronic technology, specifically to a stable power supply device for airborne multispectral optoelectronic systems. Background Technology

[0002] With the development of the aviation industry, multispectral imaging equipment has been widely used in fields such as airborne remote sensing, environmental monitoring, and military reconnaissance. These devices typically have extremely high requirements for power supply stability, noise suppression, and reliability. However, the power supply environment of aircraft is complex, with issues such as voltage fluctuations and electromagnetic interference, which can affect the normal operation of multispectral equipment. For example, traditional power supply devices are unreliable in suppressing surge voltages, and the power supply system has a weak response capability to fluctuations in the input of the preceding stage, resulting in slow loop response and an inability to adjust the input surge voltage in a timely manner. Furthermore, the power-down hold function has insufficient duration; when the input 28V is lost, the output cannot maintain the system's 400W operation for 50ms, directly affecting the shutdown of subsequent systems and data retention. The short hold time also means that subsequent functional circuits cannot process the data in time, leading to system file loss, etc. Utility Model Content

[0003] In view of the problems existing in the prior art, this utility model provides a high-efficiency, lightweight and reliable stable power supply device for airborne multispectral optoelectronic systems.

[0004] This utility model discloses a stable power supply device for an airborne multispectral optoelectronic system, comprising an input filter anti-reverse circuit, a spike surge suppression circuit, a DC-DC conversion circuit, a voltage acquisition and reporting circuit, and an output filter circuit connected in sequence.

[0005] The input of the input filtering anti-reverse circuit is connected to an external power supply, and the output is connected to a spike surge suppression circuit.

[0006] The surge suppression circuit includes three levels of loops, and the output of the surge suppression circuit is connected to a DC-DC converter circuit.

[0007] The DC-DC conversion circuit includes a first non-isolated output P1 and a second isolated output P2; the main output terminals of the first non-isolated output P1 and the second isolated output P2 are connected to the output filter circuit, and the feedback terminals are connected to the voltage acquisition and reporting circuit.

[0008] The input terminal of the voltage acquisition and reporting circuit is connected in parallel to the output terminal of the DC-DC conversion circuit, and the voltage acquisition and reporting circuit includes a voltage divider resistor network, an ADC chip, and an MCU.

[0009] The output filter circuit adopts a π-type filter structure, and its output terminal is connected to the load of the optoelectronic system.

[0010] Furthermore, the peak surge suppression circuit of the stable power supply device of this utility model includes a normal switching stage peak circuit, an input power supply switching power-on circuit, and an ultra-high peak power supply circuit;

[0011] The normal switching stage spike circuit includes a first control module, a resistor R4, and an N-channel field-effect transistor Q1 connected in series with the resistor R4. The first control module includes a resistor R1 connected in series between the input voltage VIN of the spike surge suppression circuit and the power supply ground, an isolating switch U1, a diode ZD1, and a digital control module F1.

[0012] The input power supply switching power-on circuit includes a second control module, a resistor R5, and an N-channel field-effect transistor Q2 connected in series with the resistor R5. The second control module includes a resistor R2 connected in series between the input voltage VIN of the surge suppression circuit and the power supply ground, an isolating switch U2, a diode ZD2, and a digital control module F2.

[0013] The ultra-high peak power supply circuit includes a third control module, a resistor R6, and an N-channel field-effect transistor Q3 connected in series with the resistor R6. The third control module includes a resistor R3 connected in series between the input voltage VIN of the peak surge suppression circuit and the power supply ground, an isolating switch U3, a diode ZD3, and a digital control module F3.

[0014] Furthermore, the digital control module F1 of the stable power supply device of this utility model is a gating unit for selecting voltage signals below 100V; the digital control module F2 is a gating unit for selecting voltage signals from 100V to 200V; and the digital control module F3 is a gating unit for selecting voltage signals above 200V.

[0015] Furthermore, the second isolated output P2 of the DC-DC conversion circuit of the stable power supply device of this utility model includes an input filter unit, a switching power supply M1 and an output filter unit connected in sequence;

[0016] The +VIN of the switching power supply M1 is connected to the casing through capacitor C87, and the -VIN of the switching power supply M1 is connected to the casing through capacitor C98. A resistor R100 is connected between INH and -VIN of the switching power supply M1. The +VO of the switching power supply M1 is connected to +S and is connected to the TRM of the switching power supply M1 through resistor R96. The -VO of the switching power supply M1 is connected to -S and is connected to the TRM of the switching power supply M1 through resistor R106.

[0017] The input filtering unit consists of capacitors C92, C93, and C94 connected in parallel. One end of capacitor C92 is connected to the input voltage VIN of the input filtering unit, and the other end is connected to the input VG of the input filtering unit. An inductor L10 is connected in series between capacitors C93 and C94.

[0018] The output filtering unit consists of capacitors C95, C96, and C97 connected in parallel. One end of capacitor C97 is connected to the input positive voltage 28V1+, and the other end is connected to SGND. Capacitors C95 and C96 are connected to the outer casing through capacitors C88 and C99, respectively.

[0019] Furthermore, the input voltage VIN of the input filtering anti-reverse circuit of the stable power supply device of this utility model is connected to the gate of the N-channel field-effect transistor Q6 through resistor R7; the N-channel field-effect transistor Q6 is connected in parallel with resistor R8, diode ZD6 and capacitor C10; one end of resistor R7 is connected to resistor R8, and the other end is connected to the positive input voltage VIN+ of the input filtering anti-reverse circuit, and the other end of resistor R8 is connected to the power ground of the input filtering anti-reverse circuit; the drain of the N-channel field-effect transistor Q6 is connected to the input VG of the input filtering anti-reverse circuit.

[0020] Furthermore, the output filtering circuit of the stable power supply device of this utility model includes capacitors C3, C4, and C5 connected in parallel; one end of capacitor C3 is connected to the input voltage VIN of the output filtering circuit, and the other end is connected to the input VG of the output filtering circuit; an inductor L1 is connected in series between capacitors C4 and C5; the positive input voltage VIN+ of the output filtering circuit is connected to the outer casing through capacitor C1; the power ground of the output filtering circuit is connected to the outer casing through capacitor C9.

[0021] Furthermore, the first non-isolated output P1 of the DC-DC conversion circuit of the stable power supply device of this utility model is a non-isolated output that follows the input; the input voltage VIN of the first non-isolated output P1 is connected to VG through series resistors R9 and R10; the gates of Q7, Q8, Q9 and Q10 are all connected to the voltage divider node of R9 and R10, and the source and drain are all connected to VG.

[0022] Furthermore, the stable power supply device of this utility model also includes an aluminum alloy encapsulation housing.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] The present invention discloses a stable power supply device for airborne multispectral optoelectronic systems. Firstly, through a graded response mechanism of a three-stage surge suppression circuit (normal switching stage, input power supply switching stage, and ultra-high surge stage), combined with the precise selection of voltage signals below 100V, 100-200V, and above 200V by digital control modules (F1-F3), dynamic suppression of a wide range of input surge voltages is achieved, greatly improving the response speed and effectively solving the problem of unreliable transient high voltage suppression in traditional power supply devices.

[0025] Secondly, the DC-DC conversion circuit of the stable power supply device described in this application adopts a dual-path design with non-isolated output (P1) and isolated output (P2), and with the π-type filter structure of the output filter circuit (capacitors C3-C5, inductor L1), the output voltage ripple can be reduced and the noise suppression capability can be improved, meeting the stringent requirements of airborne optoelectronic systems for power purity.

[0026] In addition, the input filtering anti-reverse circuit (Q6, ZD6, C10) works in conjunction with the output power-off retention function to maintain a 400W load power supply for more than 50ms after the external power supply fails, ensuring that the downstream system completes the storage of critical data and avoiding data loss due to momentary power failure.

[0027] The stable power supply device described in this application combines a modular circuit design (input filtering and reverse current protection → surge suppression → DC-DC conversion → voltage acquisition → output filtering) with an aluminum alloy housing, achieving excellent heat dissipation while significantly improving the environmental adaptability of the power supply system. Specifically, the voltage acquisition and reporting circuit's voltage divider resistor network and ADC chip monitor the DC-DC output voltage in real time, and adjust the DC-DC conversion circuit via MCU feedback (e.g., adjusting the TRM pin voltage of the switching power supply M1), solving the problem of lag in traditional open-loop power supply response. The isolated output P2 employs a multi-layer filtering design (capacitors C92-C94, inductor L10) and shell capacitor coupling (C87, C98), which greatly reduces common-mode interference, ensuring stable operation of sensitive optoelectronic equipment in environments with strong electromagnetic interference. Furthermore, the N-channel MOSFET Q6 in the reverse current protection circuit can withstand high instantaneous reverse current surges, achieving a high protection level, which also significantly improves the power supply reliability in airborne scenarios.

[0028] The components of the stable power supply device described in this application are 100% domestically produced and meet the derating requirements; the power ground is isolated from the casing, communication ground, and internal circuit ground; the casing is floating ground, the power traces are neatly routed, and the power lines and signal lines are clearly separated and do not overlap. Attached Figure Description

[0029] Figure 1 This is a system block diagram according to Embodiment 1 of the present utility model;

[0030] Figure 2 This is a diagram of the surge suppression circuit described in Embodiment 1 of this utility model;

[0031] Figure 3 This is a circuit diagram of the second isolated output P2 as described in Embodiment 1 of this utility model;

[0032] Figure 4 This is the input filtering anti-reverse circuit diagram described in Embodiment 1 of this utility model;

[0033] Figure 5 This is a diagram of the output filter circuit described in Embodiment 1 of this utility model;

[0034] Figure 6 This is a circuit diagram of the first non-isolated output P1 as described in Embodiment 1 of this utility model. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the specific embodiments of this utility model clearer, the technical solutions in the specific embodiments of this utility model will be clearly and completely described below. Where specific conditions are not specified in the specific embodiments, they shall be performed according to conventional conditions or conditions recommended by the manufacturer.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Specific Implementation Method 1

[0038] A stable power supply device for an airborne multispectral optoelectronic system includes an input filter anti-reverse circuit, a spike surge suppression circuit, a DC-DC conversion circuit, a voltage acquisition and reporting circuit, and an output filter circuit connected in sequence.

[0039] The input of the input filtering anti-reverse circuit is connected to an external power supply, and the output is connected to a spike surge suppression circuit.

[0040] The surge suppression circuit includes three levels of loops, and the output of the surge suppression circuit is connected to a DC-DC converter circuit.

[0041] The DC-DC conversion circuit includes a first non-isolated output P1 and a second isolated output P2; the main output terminals of the first non-isolated output P1 and the second isolated output P2 are connected to the output filter circuit, and the feedback terminals are connected to the voltage acquisition and reporting circuit.

[0042] The input terminal of the voltage acquisition and reporting circuit is connected in parallel to the output terminal of the DC-DC conversion circuit, and the voltage acquisition and reporting circuit includes a voltage divider resistor network, an ADC chip, and an MCU.

[0043] The output filter circuit adopts a π-type filter structure, and its output terminal is connected to the load of the optoelectronic system.

[0044] In other embodiments, the surge suppression circuit includes a normal switching stage surge circuit, an input power supply switching power-on circuit, and an ultra-high surge power supply circuit;

[0045] The normal switching stage spike circuit includes a first control module, a resistor R4, and an N-channel field-effect transistor Q1 connected in series with the resistor R4. The first control module includes a resistor R1 connected in series between the input voltage VIN of the spike surge suppression circuit and the power supply ground, an isolating switch U1, a diode ZD1, and a digital control module F1.

[0046] The input power supply switching power-on circuit includes a second control module, a resistor R5, and an N-channel field-effect transistor Q2 connected in series with the resistor R5. The second control module includes a resistor R2 connected in series between the input voltage VIN of the surge suppression circuit and the power supply ground, an isolating switch U2, a diode ZD2, and a digital control module F2.

[0047] The ultra-high peak power supply circuit includes a third control module, a resistor R6, and an N-channel field-effect transistor Q3 connected in series with the resistor R6. The third control module includes a resistor R3 connected in series between the input voltage VIN of the peak surge suppression circuit and the power supply ground, an isolating switch U3, a diode ZD3, and a digital control module F3.

[0048] In other embodiments, the digital control module F1 is a gating unit for selecting voltage signals below 100V; the digital control module F2 is a gating unit for selecting voltage signals from 100V to 200V; and the digital control module F3 is a gating unit for selecting voltage signals above 200V.

[0049] In other embodiments, the second isolated output P2 of the DC-DC converter circuit includes an input filter unit, a switching power supply M1, and an output filter unit connected in sequence.

[0050] The +VIN of the switching power supply M1 is connected to the casing through capacitor C87, and the -VIN of the switching power supply M1 is connected to the casing through capacitor C98. A resistor R100 is connected between INH and -VIN of the switching power supply M1. The +VO of the switching power supply M1 is connected to +S and is connected to the TRM of the switching power supply M1 through resistor R96. The -VO of the switching power supply M1 is connected to -S and is connected to the TRM of the switching power supply M1 through resistor R106.

[0051] The input filtering unit consists of capacitors C92, C93, and C94 connected in parallel. One end of capacitor C92 is connected to the input voltage VIN of the input filtering unit, and the other end is connected to the input VG of the input filtering unit. An inductor L10 is connected in series between capacitors C93 and C94.

[0052] The output filtering unit consists of capacitors C95, C96, and C97 connected in parallel. One end of capacitor C97 is connected to the input positive voltage 28V1+, and the other end is connected to SGND. Capacitors C95 and C96 are connected to the outer casing through capacitors C88 and C99, respectively.

[0053] In other embodiments, the input voltage VIN of the input filter anti-reverse circuit is connected to the gate of the N-channel field-effect transistor Q6 through resistor R7; the N-channel field-effect transistor Q6 is connected in parallel with resistor R8, diode ZD6 and capacitor C10; one end of resistor R7 is connected to resistor R8, and the other end is connected to the positive input voltage VIN+ of the input filter anti-reverse circuit, and the other end of resistor R8 is connected to the power supply ground of the input filter anti-reverse circuit; the drain of the N-channel field-effect transistor Q6 is connected to the input VG of the input filter anti-reverse circuit.

[0054] In other embodiments, the output filter circuit includes capacitors C3, C4, and C5 connected in parallel; one end of capacitor C3 is connected to the input voltage VIN of the output filter circuit, and the other end is connected to the input VG of the output filter circuit; an inductor L1 is connected in series between capacitors C4 and C5; the positive input voltage VIN+ of the output filter circuit is connected to the housing through capacitor C1; and the power ground of the output filter circuit is connected to the housing through capacitor C9.

[0055] In other embodiments, the first non-isolated output P1 of the DC-DC conversion circuit is a non-isolated output that follows the input; the input voltage VIN of the first non-isolated output P1 is connected to VG through series resistors R9 and R10; the gates of Q7, Q8, Q9 and Q10 are all connected to the voltage divider node of R9 and R10, and the source and drain are all connected to VG.

[0056] In other embodiments, the stable power supply device further includes an aluminum alloy encapsulation housing. Example 1

[0057] A stable power supply device for airborne multispectral optoelectronic systems, such as Figure 1 As shown, it includes an input filter anti-reverse circuit, a spike surge suppression circuit, a DC-DC conversion circuit, a voltage acquisition and reporting circuit, and an output filter circuit connected in sequence.

[0058] like Figure 4 As shown, the input terminal of the input filtering anti-reverse circuit is connected to an external power supply, and the output terminal is connected to a spike surge suppression circuit. The input voltage VIN of the input filtering anti-reverse circuit is connected to the gate of the N-channel field-effect transistor Q6 through resistor R7; the N-channel field-effect transistor Q6 is connected in parallel with resistor R8, diode ZD6, and capacitor C10; one end of resistor R7 is connected to resistor R8, and the other end is connected to the positive input voltage VIN+ of the input filtering anti-reverse circuit; the other end of resistor R8 is connected to the power ground of the input filtering anti-reverse circuit; the drain of the N-channel field-effect transistor Q6 is connected to the input VG of the input filtering anti-reverse circuit.

[0059] like Figure 2 As shown, the surge suppression circuit includes three levels of loops, and the output of the surge suppression circuit is connected to a DC-DC converter circuit.

[0060] The surge suppression circuit includes a normal switching stage surge circuit, an input power supply switching power-on circuit, and an ultra-high surge power supply circuit.

[0061] The normal switching stage spike circuit includes a first control module, a resistor R4, and an N-channel field-effect transistor Q1 connected in series with the resistor R4. The first control module includes a resistor R1 connected in series between the input voltage VIN of the spike surge suppression circuit and the power supply ground, an isolating switch U1, a diode ZD1, and a digital control module F1.

[0062] The input power supply switching power-on circuit includes a second control module, a resistor R5, and an N-channel field-effect transistor Q2 connected in series with the resistor R5. The second control module includes a resistor R2 connected in series between the input voltage VIN of the surge suppression circuit and the power supply ground, an isolating switch U2, a diode ZD2, and a digital control module F2.

[0063] The ultra-high peak power supply circuit includes a third control module, a resistor R6, and an N-channel field-effect transistor Q3 connected in series with the resistor R6. The third control module includes a resistor R3 connected in series between the input voltage VIN of the peak surge suppression circuit and the power supply ground, an isolating switch U3, a diode ZD3, and a digital control module F3.

[0064] In this embodiment 1, the digital control module F1 is a gating unit for selecting voltage signals below 100V; the digital control module F2 is a gating unit for selecting voltage signals from 100V to 200V; and the digital control module F3 is a gating unit for selecting voltage signals above 200V.

[0065] When the digital control module F1 is turned on, the isolating switch U1 drives the N-channel field-effect transistor Q1 to turn on, and the N-channel field-effect transistors Q2 and Q3 are turned off. The current flows through the N-channel field-effect transistor Q1 and the resistor R1 to supply power to the subsequent circuit.

[0066] When the digital control module F2 is turned on, the isolating switch U2 drives the N-channel field-effect transistor Q2 to turn on, while the N-channel field-effect transistors Q1 and Q3 are turned off. Current flows through the N-channel field-effect transistor Q2 and resistor R2 to supply power to the subsequent circuit.

[0067] When the digital control module F3 is turned on, the isolating switch U3 drives the N-channel field-effect transistor Q3 to turn on, while the N-channel field-effect transistors Q1 and Q2 are turned off. Current flows through the N-channel field-effect transistor Q3 and resistor R3 to supply power to the subsequent circuit.

[0068] The DC-DC conversion circuit includes a first non-isolated output P1 and a second isolated output P2; the main output terminals of the first non-isolated output P1 and the second isolated output P2 are connected to the output filter circuit, and the feedback terminals are connected to the voltage acquisition and reporting circuit.

[0069] like Figure 6 As shown, the first non-isolated output P1 of the DC-DC conversion circuit is a non-isolated output that follows the input; the input voltage VIN of the first non-isolated output P1 is connected to VG through series resistors R9 and R10; the gates of Q7, Q8, Q9 and Q10 are all connected to the voltage divider node of R9 and R10, and the source and drain are all connected to VG.

[0070] like Figure 3 As shown, the second isolated output P2 of the DC-DC conversion circuit includes an input filter unit, a switching power supply M1, and an output filter unit connected in sequence.

[0071] The +VIN of the switching power supply M1 is connected to the casing through capacitor C87, and the -VIN of the switching power supply M1 is connected to the casing through capacitor C98. A resistor R100 is connected between INH and -VIN of the switching power supply M1. The +VO of the switching power supply M1 is connected to +S and is connected to the TRM of the switching power supply M1 through resistor R96. The -VO of the switching power supply M1 is connected to -S and is connected to the TRM of the switching power supply M1 through resistor R106.

[0072] The input filtering unit consists of capacitors C92, C93, and C94 connected in parallel. One end of capacitor C92 is connected to the input voltage VIN of the input filtering unit, and the other end is connected to the input VG of the input filtering unit. An inductor L10 is connected in series between capacitors C93 and C94.

[0073] The output filtering unit consists of capacitors C95, C96, and C97 connected in parallel. One end of capacitor C97 is connected to the input positive voltage 28V1+, and the other end is connected to SGND. Capacitors C95 and C96 are connected to the outer casing through capacitors C88 and C99, respectively.

[0074] The input terminal of the voltage acquisition and reporting circuit is connected in parallel to the output terminal of the DC-DC conversion circuit. The voltage acquisition and reporting circuit includes a voltage divider resistor network, an ADC chip, and an MCU. It acquires the output voltage of the DC-DC conversion circuit in real time and reports it to the main control system via a CAN bus or RS422 interface. In this embodiment 1, the voltage acquisition and reporting circuit acquires the output voltage of the DC-DC conversion circuit in real time and reports it to the main control system via a CAN bus or RS422 interface. The voltage acquisition and reporting circuit acquires the output voltage through a voltage divider resistor network and an ADC chip, processes it through the MCU, and then reports it to the main control system.

[0075] The output filter circuit adopts a π-type filter structure, and its output terminal is connected to the load of the optoelectronic system.

[0076] like Figure 5 As shown, the output filter circuit includes capacitors C3, C4, and C5 connected in parallel; one end of capacitor C3 is connected to the input voltage VIN of the output filter circuit, and the other end is connected to the input VG of the output filter circuit; an inductor L1 is connected in series between capacitors C4 and C5; the positive input voltage VIN+ of the output filter circuit is connected to the casing through capacitor C1; the power ground of the output filter circuit is connected to the casing through capacitor C9.

[0077] The stable power supply device also includes an aluminum alloy encapsulation housing.

[0078] The embodiments described above are some, but not all, embodiments of this utility model. The detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A stable power supply device for airborne multispectral optoelectronic systems, characterized in that, It includes an input filter anti-reverse circuit, a spike surge suppression circuit, a DC-DC conversion circuit, a voltage acquisition and reporting circuit, and an output filter circuit connected in sequence. The input of the input filtering anti-reverse circuit is connected to an external power supply, and the output is connected to a spike surge suppression circuit. The surge suppression circuit includes three levels of loops, and the output of the surge suppression circuit is connected to a DC-DC converter circuit. The DC-DC conversion circuit includes a first non-isolated output P1 and a second isolated output P2; the main output terminals of the first non-isolated output P1 and the second isolated output P2 are connected to the output filter circuit, and the feedback terminals are connected to the voltage acquisition and reporting circuit. The input terminal of the voltage acquisition and reporting circuit is connected in parallel to the output terminal of the DC-DC conversion circuit, and the voltage acquisition and reporting circuit includes a voltage divider resistor network, an ADC chip, and an MCU. The output filter circuit adopts a π-type filter structure, and its output terminal is connected to the load of the optoelectronic system.

2. The stable power supply device according to claim 1, characterized in that, The surge suppression circuit includes a normal switching stage surge circuit, an input power supply switching power-on circuit, and an ultra-high surge power supply circuit. The normal switching stage spike circuit includes a first control module, a resistor R4, and an N-channel field-effect transistor Q1 connected in series with the resistor R4. The first control module includes a resistor R1 connected in series between the input voltage VIN of the spike surge suppression circuit and the power supply ground, an isolating switch U1, a diode ZD1, and a digital control module F1. The input power supply switching power-on circuit includes a second control module, a resistor R5, and an N-channel field-effect transistor Q2 connected in series with the resistor R5. The second control module includes a resistor R2 connected in series between the input voltage VIN of the surge suppression circuit and the power supply ground, an isolating switch U2, a diode ZD2, and a digital control module F2. The ultra-high peak power supply circuit includes a third control module, a resistor R6, and an N-channel field-effect transistor Q3 connected in series with the resistor R6. The third control module includes a resistor R3 connected in series between the input voltage VIN of the peak surge suppression circuit and the power supply ground, an isolating switch U3, a diode ZD3, and a digital control module F3.

3. The stable power supply device according to claim 2, characterized in that, The digital control module F1 is a gating unit for selecting voltage signals below 100V; the digital control module F2 is a gating unit for selecting voltage signals from 100V to 200V; and the digital control module F3 is a gating unit for selecting voltage signals above 200V.

4. The stable power supply device according to claim 1, characterized in that, The second isolated output P2 of the DC-DC converter circuit includes an input filter unit, a switching power supply M1, and an output filter unit connected in sequence. The +VIN of the switching power supply M1 is connected to the casing through capacitor C87, and the -VIN of the switching power supply M1 is connected to the casing through capacitor C98. A resistor R100 is connected between INH and -VIN of the switching power supply M1. The +VO of the switching power supply M1 is connected to +S and is connected to the TRM of the switching power supply M1 through resistor R96. The -VO of the switching power supply M1 is connected to -S and is connected to the TRM of the switching power supply M1 through resistor R106. The input filtering unit consists of capacitors C92, C93, and C94 connected in parallel. One end of capacitor C92 is connected to the input voltage VIN of the input filtering unit, and the other end is connected to the input VG of the input filtering unit. An inductor L10 is connected in series between capacitors C93 and C94. The output filtering unit consists of capacitors C95, C96, and C97 connected in parallel. One end of capacitor C97 is connected to the input positive voltage 28V1+, and the other end is connected to SGND. Capacitors C95 and C96 are connected to the outer casing through capacitors C88 and C99, respectively.

5. The stable power supply device according to claim 1, characterized in that, The input voltage VIN of the input filtering anti-reverse circuit is connected to the gate of the N-channel field-effect transistor Q6 through resistor R7; the N-channel field-effect transistor Q6 is connected in parallel with resistor R8, diode ZD6 and capacitor C10; one end of resistor R7 is connected to resistor R8, and the other end is connected to the positive input voltage VIN+ of the input filtering anti-reverse circuit, and the other end of resistor R8 is connected to the power ground of the input filtering anti-reverse circuit; the drain of the N-channel field-effect transistor Q6 is connected to the input VG of the input filtering anti-reverse circuit.

6. The stable power supply device according to claim 1, characterized in that, The output filter circuit includes capacitors C3, C4, and C5 connected in parallel; one end of capacitor C3 is connected to the input voltage VIN of the output filter circuit, and the other end is connected to the input VG of the output filter circuit; an inductor L1 is connected in series between capacitors C4 and C5; the positive input voltage VIN+ of the output filter circuit is connected to the casing through capacitor C1; the power ground of the output filter circuit is connected to the casing through capacitor C9.

7. The stable power supply device according to claim 1, characterized in that, The first non-isolated output P1 of the DC-DC conversion circuit is a non-isolated output that follows the input; the input voltage VIN of the first non-isolated output P1 is connected to VG through series resistors R9 and R10; the gates of Q7, Q8, Q9 and Q10 are all connected to the voltage divider node of R9 and R10, and the source and drain are all connected to VG.

8. The stable power supply device according to claim 1, characterized in that, The stable power supply device also includes an aluminum alloy encapsulation housing.

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