Filter suitable for high-altitude low-pressure environment
By using potting compound to submerge electronic components inside the filter and increasing the switching speed of the field-effect transistor, the problems of arcing and slow frequency hopping speed of high-power frequency hopping filters in high-altitude, low-pressure environments are solved, achieving high-speed frequency hopping and miniaturized design.
Patent Information
- Application Number
- CN202520620195.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-02
AI Technical Summary
High-power frequency hopping filters are prone to arcing at full power in high-altitude, low-pressure environments, which affects the normal operation of communication equipment. Furthermore, their slow frequency hopping speed makes it difficult to meet the requirements for miniaturization and lightweight design.
The internal electronic components of the filter are submerged in potting compound, thermally conductive insulating adhesive is used instead of air as the insulating medium, and the switching speed of the field-effect transistor is increased by a voltage converter to achieve fast frequency hopping.
Achieving full-power safe operation and high-speed frequency hopping of a high-power frequency hopping filter in a high-altitude, low-pressure environment without increasing the overall size of the filter module improves reliability and frequency hopping speed.
Smart Images
Figure CN223957525U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to filter technical field, concretely is a filter suitable for high altitude low air pressure environment. BACKGROUND
[0002] The radio frequency filter bears a very important role in the communication system, its function is to filter out the out-band noise and interference signal, and allow the useful signal to pass. The high-power frequency hopping filter is placed at the end of the radio station transmitting system, and bears a large radio frequency power, and there is a risk of short circuit by the high-power signal. The previous high-power frequency hopping filter mostly works on the ground or in low-altitude environment, and the product is full of air as the insulating medium, and the filter is not easy to spark under the full power state. However, when the frequency hopping filter needs to work at an altitude of more than 20,000 meters, the air is thin, and the spark phenomenon is easy to occur under the full power working state, which seriously affects the normal work of the communication equipment. Usually, the mutual distance of the electronic components and structural parts inside the filter is enlarged to ensure the safety distance, but this will greatly increase the overall size of the filter module, which does not meet the market demand of miniaturization and light weight of the high-power frequency hopping filter.
[0003] The fast frequency hopping and filtering function of the digital frequency hopping filter is the guarantee of the anti-interference, anti-interception and security of the frequency hopping radio station. The faster the frequency hopping speed of the radio station, the stronger the signal anti-interference and anti-interception ability. The frequency hopping speed of the frequency hopping filter determines the speed of the frequency hopping radio station. The frequency hopping speed of the frequency hopping filter is mainly affected by the digital control circuit. The control circuit is based on a triode / field effect transistor. The power capacity of the frequency hopping filter is related to the voltage. The higher the voltage, the larger the power capacity of the filter. Correspondingly, the rated withstand voltage of the triode / field effect transistor also needs to be larger.
[0004] And the junction capacitance of the triode / field effect transistor with a larger withstand voltage is also larger. Because the junction capacitance needs to be charged and discharged, the larger the capacitance, the longer the time needed for charging and discharging, so the switching speed of the triode / field effect transistor will be slower. Therefore, the current situation is that the frequency hopping speed of the high-power frequency hopping filter is slower than that of the small-power frequency hopping filter. The frequency hopping speed of the high-power frequency hopping filter on the market is about 20us, while the frequency hopping speed of the small-power frequency hopping filter is about 10us. The high-power frequency hopping filter slows down the frequency hopping speed of the whole radio station. INVENTION CONTENTS
[0005] The technical problem to be solved by the utility model is to realize high-speed frequency hopping of the high-power frequency hopping filter under the full power state in the high-altitude low air pressure environment without increasing the overall size of the filter module.
[0006] To solve the above technical problems, the utility model provides the following technical scheme:
[0007] The application discloses a filter suitable for a high-altitude low-pressure environment, which comprises a resonant cavity 10, a radio frequency resonant loop arranged in the resonant cavity 10, and a potting glue 20 filled in the resonant cavity 10, wherein the potting glue 20 at least completely submerges the radio frequency resonant loop in the resonant cavity 10.
[0008] The radio frequency resonant loop comprises a resonant inductor 31, a diode 32 and a resonant capacitor 33.
[0009] One end of the resonant inductor 31 is welded on the resonant cavity 10, and is a short-circuit end; the other end of the resonant inductor 31 is connected with the cathode of the diode 32 and the resonant capacitor 33; and the anode of the diode 32 is welded on the structure 11 of the resonant cavity 10.
[0010] In the embodiment, the coil body of the resonant inductor 31 is suspended in the resonant cavity 10.
[0011] In the embodiment, the radio frequency resonant loop comprises a plurality of resonant capacitor arrays, each of which comprises two resonant capacitor branches; each of the resonant capacitor branches comprises a resonant inductor 31, a diode 32 and a resonant capacitor 33, and the resonant capacitors in each of the resonant capacitor branches are connected.
[0012] In the embodiment, the filter comprises a voltage converter; and each of the resonant capacitor arrays is connected with one voltage converter.
[0013] In the embodiment, the voltage converter comprises field effect tubes Q1 and Q2, diodes D1 and D2, resistors R1, R2 and R3, and an inductor L23.
[0014] One end of the resistor R3 is connected with the gate of the field effect tube Q2, and the source of the field effect tube Q2 is connected with a power supply.
[0015] The diode D2 is connected with the inductor L23 in parallel, one end of the parallel connection is connected with the drain of the field effect tube Q2 and the gate of the field effect tube Q1, and the other end of the parallel connection is connected with the cathode of the diode D1.
[0016] The resistor R2 is connected with the drain of the field effect tube Q2, and the resistor R1 is connected with the drain of the field effect tube Q1 after being connected with the resistor R2 in series.
[0017] The source of the field effect tube Q1 is connected with the anode of the diode D1; a power supply is connected between the connection line of the resistor R2 and the resistor R1; and the anode of the diode D1 is connected with the short-circuit end of the resonant inductor in each of the resonant capacitor branches.
[0018] In the embodiment, a 400V power supply is connected between the connection line of the resistor R2 and the resistor R1.
[0019] In the embodiment, a 400V power supply is connected between the connection line of the resistor R2 and the resistor R1.
[0020] In the embodiment, the other end of the resistor R3 is connected with an input level signal.
[0021] Compared with the prior art, the filter has the advantages that the electronic components and the working resonant cavity are filled with the pouring glue, the air is replaced by the insulating glue as the insulating medium, the high-power frequency hopping filter can work safely under the high-altitude low-pressure environment, and the overall size of the filter module is not increased.
[0022] The frequency hopping speed of the prior high-power frequency hopping filter is difficult to break through 10us, and the root cause lies in that the high-voltage field effect tube in the control circuit has a slow opening speed. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 The utility model discloses a filter schematic diagram suitable for high-altitude low-pressure environment.
[0024] Figure 2 The utility model discloses a resonant cavity schematic diagram before filling the pouring glue.
[0025] Figure 3 The utility model discloses a pouring glue pouring diode and resonant capacitor schematic diagram.
[0026] Figure 4 The utility model discloses a diode and resonant capacitor schematic diagram before filling the pouring glue.
[0027] Figure 5 The utility model discloses a resonant capacitor array circuit schematic diagram.
[0028] Figure 6 The utility model discloses a voltage converter circuit diagram. DETAILED DESCRIPTION
[0029] In order to facilitate the person skilled in the art to understand the technical scheme of the utility model, the technical scheme of the utility model will be further described in conjunction with the drawings of the specification.
[0030] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of the technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise explicitly and specifically limited.
[0031] Referring to Figures 1 to 4 As shown in the drawings, the utility model provides a kind of filter suitable for high altitude low pressure environment, comprising: resonant cavity 10, radio frequency resonance loop is provided in resonant cavity 10, and resonant cavity 10 is filled with potting glue 20, and potting glue 20 is at least completely submerged radio frequency resonance loop in resonant cavity 10.
[0032] In the embodiment, radio frequency resonance loop includes resonant inductance 31, diode 32 and resonant capacitance 33. One end of resonant inductance 31 is welded on the resonant cavity, which is short-circuit end, and the other end of resonant inductance 31 is connected with the cathode of diode 32 and resonant capacitance 33. The anode of diode 32 is welded on the structure 11 of resonant cavity 10, which is convenient for heat dissipation.
[0033] In the embodiment, and the coil main body of resonant inductance 31 is suspended in resonant cavity 10, 4mm away from the upper and lower cover plates of resonant cavity 10.
[0034] In the embodiment, the potting glue thickness is at least completely submerged the coil main body of resonant inductance 31, completely submerged diode 32 and resonant capacitance 33, but cannot exceed resonant cavity 10, so as to avoid affecting the cover plate sealing of resonant cavity 10. Potting glue cannot be filled at one time, otherwise it will affect the solidification and bubble exhaust of potting glue 20 because of too thick glue layer, and cannot reach the expected effect. Potting glue should be filled layer by layer, and each layer is about 2mm thick, and potting glue is continuously filled after the underlying layer is basically solidified.
[0035] In the embodiment, potting glue 20 is heat-conducting silicone rubber, specifically two-component silicone rubber, and room temperature curing. Before curing, it must have good fluidity to fully fill the gaps in resonant cavity 10. After curing, potting glue 20 should have excellent high and low temperature resistance, excellent electrical insulation and heat conduction performance. More specifically, after selection and test of various potting glues, the potting glue with the smallest influence on the electrical performance indicators of frequency hopping filter is finally selected. In the embodiment of the utility model, potting glue 20 is silicon treasure 4926-0.8W two-component heat-conducting organic silicone rubber.
[0036] In the embodiment, after curing, the potting glue 20 of the utility model can also play the role of fixing radio frequency resonance loop and heat conduction, greatly improving the reliability of high-power frequency hopping filter, and without increasing the product size.
[0037] Referring toFigures 1 to 6 As shown in the embodiment of the utility model, the radio frequency resonance loop includes a plurality of resonance capacitor arrays, each resonance capacitor array includes two resonance capacitor branches. Each resonance capacitor branch includes a resonance inductor 31, a diode 32 and a resonance capacitor 33, and the resonance capacitor in each resonance capacitor branch is connected.
[0038] In this embodiment, the diodes 32 and the resonance capacitors 33 in the plurality of resonance capacitor arrays are arranged in the positions in the resonance cavity 10 to form a diode row 321 and a resonance capacitor row 331, as shown in FIG. 4.
[0039] In this embodiment, the filter includes a voltage converter, and each resonance capacitor array is connected with a voltage converter. The voltage converter includes field effect tubes Q1 and Q2, diodes D1 and D2, resistors R1, R2 and R3, and an inductor L23. One end of the resistor R3 is connected with the gate of the field effect tube Q2, and the source of the field effect tube Q2 is connected with the power supply. The diode D2 is connected with the inductor L23 in parallel, one end of the parallel connection is connected with the drain of the field effect tube Q2 and the gate of the field effect tube Q1, and the other end of the parallel connection is connected with the cathode of the diode D1. The resistor R2 is connected with the drain of the field effect tube Q2 after being connected with the resistor R1 in series, and the resistor R1 is connected with the drain of the field effect tube Q1. The source of the field effect tube Q1 is connected with the anode of the diode D1, the power supply is connected between the connection line of the resistor R2 and the resistor R1, and the anode of the diode D1 is connected with the short-circuit end of the resonance inductor in each resonance capacitor branch.
[0040] In this embodiment, the 400V power supply is connected between the connection line of the resistor R2 and the resistor R1, the 400V power supply is connected between the connection line of the resistor R2 and the resistor R1, and the other end of the resistor R3 is connected with the input level signal.
[0041] In this embodiment, the model of the field effect tubes Q1 and Q2 is STL2N80K5, the diodes D1 and D2 are Schottky diodes, the model of the Schottky diode is BAS3010B-03, and the inductance value of the inductor L23 is adjusted according to the size of the output load current.
[0042] Please refer to Figure 1 and Figure 2 As shown in the embodiment, based on the on-off of the drain and the source of the field effect tube, when the input interface DRIVE_IN is high +3.3V, the field effect tube Q2 is turned on, -3.3V reaches the drain through the source of the field effect tube Q2, the gate-source voltage of the field effect tube Q1 does not reach the opening voltage, Q1 is not turned on, -3.3V passes through the inductor L23 and the diode D1, and is output to the diodes in the two resonance capacitor branches through the output interface DRIVE_OUT. At this time, the diodes are turned on to the ground to form a current loop. This process is completed very quickly, and the time is about 4us.
[0043] When the input interface DRIVE_IN is low-3.3V, the gate-source voltage of the field effect transistor Q2 does not reach the required voltage drop for opening, Q2 is not turned on, and the -3.3V current of the output interface DRIVE_OUT disappears rapidly. At this time, the inductor L23 can hinder the current mutation, the inductor L23 rapidly lifts the gate voltage of the field effect transistor Q1, and forms a loop with the diode D2, so that the field effect transistor Q1 is rapidly turned on, and the +400V voltage is output to the diodes in the two resonant capacitor branches through the output interface DRIVE_OUT, and the corresponding diodes are cut off. The time for completing this process is about 7us.
[0044] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the present application, and any reference signs in the claims should not be regarded as limiting the claims.
[0045] The above-described embodiments only represent the implementation of the present application, and the protection scope of the present application is not limited to the above-described embodiments. For those skilled in the art, on the premise of not departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.
Claims
1. A filter suitable for use in a high-altitude, low-pressure environment, comprising: The application relates to a filter, which comprises the following parts: a resonant cavity (10) in which a radio frequency resonant loop is arranged, and the resonant cavity (10) is filled with potting glue (20) which completely submerges the radio frequency resonant loop in the resonant cavity (10); wherein the radio frequency resonant loop comprises a resonant inductor (31), a diode (32) and a resonant capacitor (33); one end of the resonant inductor (31) is welded on the resonant cavity (10) and is a short-circuit end, the other end of the resonant inductor (31) is connected with the cathode of the diode (32) and the resonant capacitor (33); and the anode of the diode (32) is welded on the structure (11) of the resonant cavity (10).
2. The filter according to claim 1, wherein The coil body of the resonant inductor (31) is suspended in the resonant cavity (10).
3. The filter according to claim 1, wherein The radio frequency resonant loop comprises a plurality of resonant capacitor arrays, each of which comprises two resonant capacitor branches; each of the resonant capacitor branches comprises a resonant inductor (31), a diode (32) and a resonant capacitor (33), and the resonant capacitors in each of the resonant capacitor branches are connected.
4. The filter according to claim 3, wherein The filter comprises a voltage converter; each of the resonant capacitor arrays is connected with a voltage converter.
5. The filter according to claim 4, wherein The voltage converter comprises field effect tubes Q1 and Q2, diodes D1 and D2, resistors R1, R2 and R3, and an inductor L23. One end of the resistor R3 is connected with the gate of the field effect tube Q2, and the source of the field effect tube Q2 is connected with a power supply. The diode D2 is connected with the inductor L23 in parallel, one end of the parallel connection is connected with the drain of the field effect tube Q2 and the gate of the field effect tube Q1, and the other end of the parallel connection is connected with the cathode of the diode D1. The resistor R2 is connected with the drain of the field effect tube Q2, and the resistor R1 is connected with the drain of the field effect tube Q1 after being connected with the resistor R2 in series. The source of the field effect tube Q1 is connected with the anode of the diode D1; a power supply is connected between the connection line of the resistor R2 and the resistor R1; and the anode of the diode D1 is connected with the short-circuit end of the resonant inductor in each of the resonant capacitor branches.
6. The filter according to claim 5, wherein A 400V power supply is connected between the connection line of the resistor R2 and the resistor R1.
7. The filter according to claim 5, wherein A 400V power supply is connected between the connection line of the resistor R2 and the resistor R1.
8. The filter according to claim 5, wherein The other end of the resistor R3 is connected with an input level signal.