Multi-channel Anti-saturation charge converter

Abstract

Provided in the present application is a multi-channel anti-saturation charge converter, comprising: several middle frames, a bottom shell, a top cover and a plurality of high-speed charge conversion boards, wherein all the middle frames are arranged in sequence, the bottom shell and the top cover are respectively located at two ends of each middle frame, and the bottom shell, the top cover and each middle frame are detachably connected; and cavities are formed in each middle frame and the bottom shell and are in communication with each other. The high-speed charge conversion boards are respectively arranged in the cavities of the middle frames and the cavity of the bottom shell, and each high-speed charge conversion board has a front-end charge filtering module and a high-speed charge amplification module. The bottom shell and the middle frames are each provided with a charge input connector, each charge input connector is electrically connected to a corresponding high-speed charge conversion board, and a power supply output connector is provided on the bottom shell and is electrically connected to each high-speed charge conversion board. The converter of the present application completely eliminates the effects of out-of-band high-frequency and large-capacity charges on the converter. The converter has a small size, and can thus meet the strict requirements for the volume and mass of devices in fields such as aerospace.

Description

A multi-channel anti-saturation charge converter Technical Field

[0001] The present application relates to the field of signal processing technology, and in particular to a multi-channel anti-saturation charge converter. Background Art

[0002] Piezoelectric sensors, due to their excellent dynamic performance and strong environmental adaptability, are widely used in industrial fields, aerospace, and military equipment. Piezoelectric sensors often require a charge converter to convert the output charge signal into a standard voltage signal that can be easily acquired and processed by standard modules. In some applications, the charge converter's size and channel integration requirements are high. Furthermore, the charge converter itself must possess high reliability and strong environmental adaptability to meet near-field measurement requirements. Due to inherent factors such as sensitive structures and mounting configurations, piezoelectric sensors can experience resonances outside the measurement bandwidth, several times the measurement frequency. The signal magnitude at this resonance can be amplified by tens of dB. In near-field measurements of explosive shock waves and pulsating pressure, the excitation signal has a very wide frequency range, even exceeding 100 kHz. This causes the sensor to output a large amount of high-frequency charge near the resonant frequency, leading to blockage and saturation of the charge converter, resulting in zero drift. A decrease in resonant frequency due to mounting can further exacerbate this charge converter saturation phenomenon. During actual tests, experienced testers are needed to determine whether charge conversion saturation has occurred based on the output signal waveform and evaluate the quality of the test data to determine whether a set of test data is usable. This not only increases the test cost, but also affects the effectiveness of data acquisition for some tests that are not suitable for repeatability.

[0003] Existing charge converters lack research on saturation caused by high-frequency, high-magnitude charge signals outside the passband. Chinese patent CN113271074A describes a two-wire charge amplifier circuit with high-frequency, large-signal resistance. This circuit uses a two-wire constant-current source for power, requiring a separate IEPE constant-current source and is only suitable for industrial sites or ground-based equipment. Furthermore, this circuit is suitable for vibration testing, where the charge input frequency and magnitude are far below the near-field level of explosive shock. Furthermore, the high-frequency resistance described in the circuit actually involves low-pass filtering of the converted voltage signal, thus failing to address the charge converter saturation issue.

[0004] If the number of available channels is increased by increasing the number of charge converters, the multiple charge converters will be too large to be suitable for many applications, and the multiple charge converters will be difficult to carry and install.

[0005] Summary of the Invention

[0006] In order to solve one of the above technical deficiencies, an embodiment of the present application provides a multi-channel anti-saturation charge converter.

[0007] According to an embodiment of the present application, a multi-channel anti-saturation charge converter is provided, comprising:

[0008] A plurality of middle frames, each of the middle frames being arranged in sequence;

[0009] A bottom shell and a top cover, the bottom shell and the top cover are respectively located at two ends of each of the middle frames, the bottom shell, the top cover and each of the middle frames are detachably connected, and cavities are formed in the middle frame and the bottom shell, and the cavities are interconnected;

[0010] Multiple high-speed charge conversion boards, each of which is respectively arranged in the cavity of the middle frame and the bottom shell, and each of which has a pre-charge filter module and a high-speed charge amplification module;

[0011] Among them, the bottom shell and each of the middle frames are provided with a charge input connector, and each of the charge input connectors is electrically connected to the corresponding high-speed charge conversion board. The bottom shell is provided with a power supply output connector, and the power supply output connector is electrically connected to each of the high-speed charge conversion boards.

[0012] Optionally, comprising a first fastener;

[0013] The first fastener is provided through the bottom shell, the top cover and each of the middle frames to connect and fix the bottom shell, the top cover and each of the middle frames.

[0014] Optionally, the top cover and each of the middle frames are provided with through holes, and the bottom shell has fixing holes;

[0015] One end of the first fastener passes through the through holes on the top cover and each of the middle frames in sequence and is connected to the fixing hole on the bottom shell, and the other end of the first fastener is limited to the top cover.

[0016] Optionally, a tapered guide opening is provided on a side of each through hole away from the fixing hole.

[0017] Optionally, among the bottom shell, the top cover and each of the middle frames, an annular sunken platform is provided on the edge of one of the two adjacent ones, and an annular boss is provided on the edge of the other one, and the annular boss is embedded in the annular sunken platform.

[0018] Optionally, the top cover includes a flat plate and reinforcing ribs arranged around the edge of the flat plate;

[0019] The annular sink or annular boss is provided on the reinforcing rib.

[0020] Optionally, a plurality of bosses are provided on the inner walls of the bottom shell and the middle frame, and each boss is provided with a mounting hole;

[0021] The high-speed charge conversion board is attached to the boss on the bottom shell or the middle frame, and is fixed to the mounting hole on the boss by a second fastener.

[0022] Optionally, inner gaps between the bottom shell, each of the middle frames and the top cover are sealed by coating with silicone rubber;

[0023] The cavities of the bottom shell and each of the middle frames are filled with silicone gel.

[0024] Optionally, each high-speed charge conversion board is connected to another by a wire, and each high-speed charge conversion board is connected to the power output connector by a wire;

[0025] Each of the high-speed charge conversion boards is connected to the charge input connector via a low-noise cable.

[0026] Optionally, a wire hole is provided on the high-speed charge conversion board.

[0027] By adopting the above technical solution, this application has the following beneficial effects:

[0028] The charge converter of the present application completely eliminates the influence of out-of-band high-frequency and large-capacity charges on the converter. The charge converter of the present application is small in size and meets the stringent requirements of aerospace and other fields on equipment size and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] FIG1 is a partial cross-sectional structural diagram of a multi-channel anti-saturation charge converter provided in an embodiment of the present application;

[0031] FIG2 is a bottom view of a middle frame of a multi-channel anti-saturation charge converter provided by an embodiment of the present application;

[0032] FIG3 is a schematic top view of the structure of a middle frame of a multi-channel anti-saturation charge converter provided in an embodiment of the present application;

[0033] FIG4 is a schematic structural diagram of a high-speed charge conversion board of a multi-channel anti-saturation charge converter provided in an embodiment of the present application.

[0034] In the figure: middle frame 1, through hole 11, tapered guide port 12, annular sink 13, annular boss 14, boss 15, mounting hole 16, bottom shell 2, top cover 3, high-speed charge conversion board 4, wire hole 41, assembly hole 42, charge input connector 51, power output connector 52, first fastener 6, wire 8, low-noise cable 9, first insulating film 101, second insulating film 102. DETAILED DESCRIPTION

[0035] In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless they conflict.

[0036] During the implementation of this application, the inventors discovered that the related art lacks research on charge converter saturation caused by high-frequency, high-level charge signals outside the passband. Using a two-wire constant current source for power supply requires a separate IEPE constant current source, making it only suitable for industrial sites or ground-based equipment. Furthermore, this circuit is suitable for vibration testing, but the charge input frequency and magnitude are far below the near-field level of explosive shock. Furthermore, the high-frequency resistance described in this circuit actually involves low-pass filtering of the converted voltage signal, which does not address the charge converter saturation issue. Increasing the number of available channels by increasing the number of charge converters results in multiple charge converters being too bulky to be suitable for many applications, and multiple charge converters are cumbersome to carry and install.

[0037] To address the above-mentioned issues, referring to Figures 1-4, an embodiment of the present application provides a multi-channel anti-saturation charge converter comprising a plurality of middle frames 1, a bottom shell 2, a top cover 3, and a plurality of high-speed charge conversion boards 4. Each middle frame 1 is arranged in sequence, with the bottom shell 2 and the top cover 3 respectively located at the two ends of each middle frame 1. The bottom shell 2, the top cover 3, and each middle frame 1 are detachably connected. A cavity is formed in each of the middle frame 1 and the bottom shell 2, and each cavity is interconnected. Each high-speed charge conversion board 4 is respectively arranged in the cavity of the middle frame 1 and the bottom shell 2. The high-speed charge conversion board 4 has a pre-charge filter module and a high-speed charge amplification module. A charge input connector 51 is provided on the bottom shell 2 and each middle frame 1, and each charge input connector 51 is electrically connected to the corresponding high-speed charge conversion board 4. A power output connector 52 is provided on the bottom shell 2, and the power output connector 52 is electrically connected to each high-speed charge conversion board 4. The multi-channel anti-saturation charge converter of the present patent application has a signal conduction path in which the charge signal of the piezoelectric sensor is introduced from the charge input connector 51, converted and conditioned by the charge conversion board, and then output through the power supply output connector 52.

[0038] The multi-channel anti-saturation charge converter of this patent application has a high-speed charge conversion stage and uses a pre-charge filter module to filter the charge signal before charge conversion, completely eliminating the impact of out-of-band high-frequency and large-capacity charges on the charge converter. The charge input frequency and magnitude can reach the level of the near-field of explosive impact. There is no need to consider that the reduction in resonant frequency caused by installation will further aggravate the above-mentioned charge conversion saturation phenomenon. Therefore, experienced on-site testers are eliminated from the steps of determining whether charge conversion saturation has occurred based on the output signal waveform and evaluating the quality of test data to determine whether a certain set of test data is usable, saving costs and improving accuracy.

[0039] Furthermore, the miniaturized multi-channel charge converter proposed in this patent realizes a modular channel design. It is divided into a bottom shell 2, a middle frame 1, and a top cover 3. It is integrated by longitudinal series installation. By increasing or decreasing the number of the middle frame 1 and the high-speed charge conversion board 4 installed on the middle frame 1, a single-channel, double-channel, triple-channel, quad-channel, five-channel, or even multi-channel charge converters with more channels can be serialized. The modular charge conversion of this patent only requires changing the charge input connector 51 on different modules to complete the switching of different numbers of channels. One end is connected to the power supply output connector 52 on the bottom shell 2, and the other end selects a charge input connector 51 for connection according to the number of channels required, without the need for additional channel reconnection. Not only does the integration reduce the volume of the converter, meeting the stringent requirements of aerospace and other fields on the volume and quality of equipment, but it also makes the switching of different numbers of channels easier to operate.

[0040] In some possible implementations, as shown in FIG1 , the miniaturized multi-channel anti-saturation charge converter further includes a first fastener 6. The first fastener 6 is disposed through the bottom housing 2, top cover 3, and each middle frame 1, connecting and securing the bottom housing 2, top cover 3, and each middle frame 1. The first fastener 6 sequentially passes through the top cover 3, middle frame 1, and bottom housing 2 to achieve longitudinal restraint. This eliminates the need for sequential connection from top to bottom; only one or a few penetrating first fasteners 6 are required to complete the connection of all top covers 3, middle frames 1, and bottom housings 2, resulting in a simple structure and easy installation.

[0041] Specifically, the first fastener 6 can be a bolt. The top cover 3 and each middle frame 1 are each provided with a through-hole, and the bottom shell 2 has a recessed screw hole. The first fastener 6 is sequentially threadedly connected to the top cover 3, each middle frame 1, and the bottom shell 2. Alternatively, the top cover 3 and each middle frame 1 are each provided with a through-hole 11, and the bottom shell 2 has a fixing hole. One end of the first fastener 6 passes through the through-hole 11 in the top cover 3 and each middle frame 1, and is connected to the fixing hole in the bottom shell 2. The other end of the first fastener 6 is restrained in the top cover 3. The second method is preferably selected, as it makes connection and replacement more convenient while ensuring a stable connection.

[0042] Specifically, the through hole 11 may be a cylindrical hole with a smooth inner wall, and the fixing hole may be a threaded countersunk hole.

[0043] In some possible embodiments, as shown in FIG1 , a tapered guide opening 12 is provided on a side of each through hole 11 facing away from the fixing hole. The tapered guide opening 12 forms a guiding transition chamfer of the through hole 11 or the fixing hole, serving as a guide, making it easier for the first fastener 6 to pass through the through hole 11 or connect to the fixing hole.

[0044] In some possible implementations, as shown in Figures 1-3, an annular recess 13 is provided on the edge of one of the adjacent bottom shell 2, top cover 3, and each middle frame 1, and an annular boss 14 is provided on the edge of the other, and the annular boss 14 is embedded in the annular recess 13. The annular boss 14 and the annular recess 13 are arranged in coordination to ensure that the adjacent bottom shell 2, top cover 3, and each middle frame 1 can maintain a stable position. In addition, the arrangement of the annular boss 14 and the annular recess 13 can reduce the number of first fasteners 6 used, thereby improving connection stability and connection efficiency. After the two are coordinated, constraints in both lateral directions are achieved, and no additional fasteners are required in the lateral direction, thereby achieving miniaturization.

[0045] In some possible implementations, the top cover 3 comprises a flat plate and reinforcing ribs arranged around the edge of the flat plate, with an annular depression 13 or an annular boss 14 disposed on the reinforcing ribs. The top cover 3 utilizes a reinforcing rib structure consisting of a flat plate with a circle of reinforcing ribs around the edge and then a circle of annular bosses 14. This provides greater strength than conventional cover plates and ensures that the top cover 3 does not deform in the near-field of an explosion.

[0046] In some possible implementations, multiple bosses 15 are provided on the inner walls of the bottom shell 2 and the middle frame 1, and each boss 15 is provided with a mounting hole 16. The high-speed charge conversion board 4 fits onto the bosses 15 on the bottom shell 2 or the middle frame 1 and is fixed to the mounting holes 16 on the bosses 15 via a second fastener. The high-speed charge conversion board is provided with assembly holes 42 corresponding to the mounting holes 16, and the second fastener passes through the assembly holes 42 and connects to the mounting holes 16. The bottom shell 2 and the middle frame 1 are designed with bosses 15 for mounting the charge conversion board. The height of the bosses 15 ensures that the charge conversion board does not exceed the size envelope of the bottom shell 2 and the middle frame 1 after installation. The bosses 15 and the outer periphery can limit the high-speed charge conversion board 4, so that after the high-speed charge conversion board 4 is positioned, the second fastener is used to firmly fix the high-speed charge conversion board 4.

[0047] In some possible implementations, the inner gaps between the bottom housing 2, each middle frame 1, and the top cover 3 are sealed with silicone rubber coating. The cavities of the bottom housing 2 and each middle frame 1 are filled with silicone gel. Silicone gel potting enhances the printed circuit board's resistance to impact and vibration. Before potting, the inner gaps are sealed with silicone rubber coating to prevent leakage of silicone gel into the through-hole 11 during potting, which could affect the installation of the first fastener 6.

[0048] In some possible implementations, each high-speed charge conversion board 4 is connected to each other via a wire 8, and each high-speed charge conversion board 4 is connected to the power output connector 52 via a wire 8. Each high-speed charge conversion board 4 is connected to the charge input connector 51 via a low-noise cable 9. The charge conversion board is a functional module that implements anti-saturation charge conversion. After the charge signal is input from the charge input connector 51, it is introduced into the high-speed charge conversion board 4 via the low-noise cable 9. Before entering the charge conversion stage, the charge signal first passes through the pre-charge filter module, which performs low-pass filtering on the charge signal. Charge signals within the passband pass through almost unimpeded, while high-frequency charge signals at out-of-band resonance points begin to attenuate after passing through the pre-charge filter module. The attenuation increases with increasing signal frequency. The low-noise cable 9 has a graphite layer that absorbs static charge generated by cable friction.

[0049] In some possible implementation schemes, a wire hole 41 is provided on the high-speed charge conversion board 4 .

[0050] In some possible implementations, the high-speed charge conversion board 4 on the bottom case 2 is provided with an output wiring hole. The output of the high-speed charge conversion board 4 on the bottom case 2 is provided at the wiring hole and is connected to the power output connector 52 via a wire 8 by soldering. The wire 8 output from the high-speed charge conversion board 4 on the middle frame 1 passes through the wire hole 41 and is then connected to the power output connector 52 via a wire 8 by soldering below the high-speed charge conversion board 4 in the bottom case 2.

[0051] In some possible implementations, the power output connector 52 is a nine-pin rectangular low-frequency electrical connector, and the signal ground is a dual-point redundant design. The charge input connector 51 is a circular coaxial high-frequency electrical connector.

[0052] In some possible implementation schemes, the bottom shell 2 , the middle frame 1 , and the top cover 3 are all made of lightweight aluminum alloy material.

[0053] Specifically, the high-speed charge conversion board 4 is composed of charge filtering, charge conversion, high-pass filtering, low-pass filtering, and normalization adjustment circuits. The pre-charge filter module introduces a series resistor in the charge conduction path, cooperates with the piezoelectric sensor capacitor to realize the filtering parameters, and realizes the filtering function of the high-frequency charge signal. By using the high-speed operational amplifier AD845 to build the charge conversion stage, the frequency at which distortion begins to appear under the action of 10000pC high-frequency charge is increased from 23kHz of the ordinary charge conversion stage to above 500kHz. The pre-charge filter module designed by the present invention has almost no attenuation of the charge signal within the 10kHz whole machine bandwidth, and realizes low-pass filtering of the high-frequency charge signal outside the band. The attenuation amplitude increases with the increase of the signal frequency. At 300kHz, the attenuation amplitude reaches 40dB, which can be considered that there is no charge signal input to the charge conversion stage at this time. The combination of the high-speed charge conversion stage and the pre-charge filter module of the present invention ensures that when 10000pC alternating charge is input, the high-speed charge conversion board 4 will not be saturated at any high frequency.

[0054] The high-speed charge amplification module utilizes a high-performance precision operational amplifier with a slew rate of on the order of 100V / µs. High-pass filtering removes zero drift from the charge conversion stage output, while high-order low-pass filtering quickly removes out-of-band voltage signals. A normalization circuit provides an appropriate bias voltage and normalizes the voltage-to-charge conversion coefficient. At the commonly used passband frequency design (e.g., 10kHz for impulse measurements), any high-frequency charge signal (up to 10,000pC) will not saturate the charge conversion board.

[0055] The installation steps of the miniaturized multi-channel anti-saturation charge converter of this patent application are as follows:

[0056] First, assemble the bottom shell 2 and the high-speed charge conversion board 4 within the bottom shell 2, and the middle frame 1 and the high-speed charge conversion board 4 within the middle frame 1 separately, and then test them separately. The two are assembled in a similar manner. The high-speed charge conversion board 4 is mounted on the four bosses 15 of the bottom shell 2 and the middle frame 1 using four M2.5 screws and flat washers, achieving high-reliability installation of the circuit board. Low-noise cables 9 and wires 8 are then used to connect the high-speed charge conversion board 4 to the power output connector 52 and the charge input connector 51 through soldering to achieve signal transmission. The bottom shell 2 and the middle frame 1, with the high-speed charge conversion board 4 installed, as well as the edges of the top cover 3, are designed with matching bosses 15 and groove structures. When mated, they achieve constraints in both lateral directions, allowing for reliable connection without the use of fasteners. Before mating, a first insulating film 101 that conforms to the shape of the bottom shell 2 is placed at the bottom of the bottom shell 2. After the bottom case 2 and the middle frame 1 are laterally secured, silicone gel is potted and cured. This improves the environmental adaptability of the internal high-speed charge conversion board 4, protecting it from damage under high-level vibrations and explosive shocks. A conformable second insulating film 102 is placed on top of the potting compound. The first fastener 6 then penetrates longitudinally through the fixing holes of the bottom case 2 for a secure threaded connection.

[0057] By implementing a charge filter module and a high-speed charge conversion stage, the charge amplifier saturation problem, which has plagued testers for years in engineering practice, has been resolved, improving the first-pass success rate of data acquisition in large-scale ground and flight tests. The structure of each module enables modular production, reducing production costs. The integrated boss improves the installation reliability of the charge converter board, while the annular groove and boss reduce the number of fasteners required for inter-module assembly, further miniaturizing the charge converter and meeting the stringent requirements for equipment size and quality in aerospace and other fields.

[0058] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0061] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0062] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A multi-channel anti-saturation charge converter, characterized in that: include: A plurality of middle frames, each of the middle frames is arranged in sequence; A bottom shell and a top cover, the bottom shell and the top cover are respectively located at two ends of each of the middle frames, the bottom shell, the top cover and each of the middle frames are detachably connected, and cavities are formed in the middle frame and the bottom shell, and the cavities are connected; A plurality of high-speed charge conversion boards, each of which is disposed in the cavity of the middle frame and the bottom shell, and each of which has a pre-charge filter module and a high-speed charge amplification module; Among them, the bottom shell and each of the middle frames are provided with a charge input connector, each of the charge input connectors is electrically connected to the corresponding high-speed charge conversion board, and the bottom shell is provided with a power supply output connector, and the power supply output connector is electrically connected to each of the high-speed charge conversion boards.

2. The multi-channel anti-saturation charge converter according to claim 1, characterized in that: comprising a first fastener; The first fastener is disposed through the bottom shell, the top cover and each of the middle frames to connect and fix the bottom shell, the top cover and each of the middle frames.

3. The multi-channel anti-saturation charge converter according to claim 2, characterized in that: The top cover and each of the middle frames are provided with through holes, and the bottom shell has a fixing hole; One end of the first fastener passes through the through holes on the top cover and each of the middle frames in sequence and is connected to the fixing hole on the bottom shell, and the other end of the first fastener is limited to the top cover.

4. The multi-channel anti-saturation charge converter according to claim 3, characterized in that: A conical guide opening is arranged on one side of each through hole away from the fixing hole.

5. The multi-channel anti-saturation charge converter according to claim 2, characterized in that: In the bottom shell, the top cover and each of the middle frames, an annular sink is provided at the edge of one of the adjacent ones, and an annular boss is provided at the edge of the other adjacent one, and the annular boss is embedded in the annular sink.

6. The multi-channel anti-saturation charge converter according to claim 5, characterized in that: The top cover comprises a flat plate and reinforcing ribs arranged around the edge of the flat plate; The annular sink or annular boss is arranged on the reinforcing rib.

7. The multi-channel anti-saturation charge converter according to claim 1, characterized in that: The bottom shell and the inner wall of the middle frame are both provided with a plurality of bosses, and each boss is provided with a mounting hole; The high-speed charge conversion board is attached to the boss on the bottom shell or the middle frame, and is fixed to the mounting hole on the boss by a second fastener.

8. The multi-channel anti-saturation charge converter according to claim 1, characterized in that: The inner gaps between the bottom shell, each of the middle frames and the top cover are sealed by coating with silicone rubber; The cavities of the bottom shell and each of the middle frames are filled with silicone gel.

9. The multi-channel anti-saturation charge converter according to claim 1, characterized in that: Each high-speed charge conversion board is connected to another through a wire, and each high-speed charge conversion board is connected to the power supply output connector through a wire; Each of the high-speed charge conversion boards is connected to the charge input connector via a low-noise cable.

10. The multi-channel anti-saturation charge converter according to claim 9, characterized in that: The high-speed charge conversion board is provided with a wire hole.

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