Filtering power supply and device for aerospace product EMC (Electro Magnetic Compatibility) test

Abstract

The embodiment of the invention provides a filtering power supply for an EMC test of an aerospace product, and the power supply is characterized in that the power supply comprises a safety module, a control conversion module, and a rear filtering module; the input end of the safety module is suitable for AC power supply electrical connection. The output end of the safety module is electrically connected with the input end of the control conversion module; the output end of the control conversion module is electrically connected with the input end of the filter circuit; the safety module is used for protecting surge interference of the control conversion module and filtering electromagnetic pollution generated when the control conversion module works, and the control conversion module is used for receiving the alternating current of the safety module and converting the alternating current into direct current; and the rear filtering module is used for filtering the direct current output by the control conversion module. Therefore, the problem of electromagnetic interference of a universal power supply in the anechoic chamber or the problem that some tests cannot be realized due to interference of power supply resonance and low-voltage large current outside the anechoic chamber and large power supply ripple on EUT can be solved.

Description

Technical Field

[0001] The embodiments of this specification relate to the field of aerospace technology, and in particular to a filter power supply used for EMC testing of aerospace products. Background Art

[0002] In conventional EMC testing, darkrooms and supporting shielded rooms use different power supply systems and power filters to prevent interference signals from being transmitted into the darkroom through power lines and affecting test results. The power supply is placed outside the darkroom, and the power passes through the filter installed on the outer wall of the darkroom before entering the darkroom to power the EUT. Since the darkroom filter introduces a large inductive load, when the transient power of some EUTs is large, resonance between the EUT and the darkroom power filter will occur, causing unstable power supply, which often cannot meet the test power supply requirements of the EUT. Therefore, a better solution is urgently needed. Summary of the invention

[0003] In view of this, the embodiments of this specification provide a filter power supply for EMC testing of aerospace products to solve the technical defects existing in the prior art.

[0004] According to a first aspect of an embodiment of this specification, there is provided a filter power supply for EMC testing of aerospace products, comprising a safety module, a control conversion module and a post-filter module;

[0005] The input terminal of the safety module is suitable for AC power supply electrical connection;

[0006] The output end of the safety module is electrically connected to the input end of the control conversion module;

[0007] The output end of the control conversion module is electrically connected to the input end of the filter circuit;

[0008] Safety module, used to protect the control conversion module from sudden interference and filter out electromagnetic pollution generated when the control conversion module is working;

[0009] A control conversion module, used for receiving the alternating current from the safety module and converting the alternating current into direct current;

[0010] The post-filter module is used to filter the direct current output by the control conversion module.

[0011] In a possible implementation, the safety module includes a surge protection circuit and a pre-filter circuit;

[0012] Surge protection circuit, used to protect products from damage caused by surge voltage and current;

[0013] The pre-filter circuit is used to process the input signal and filter out useless signals in other frequency bands except the target frequency band signal.

[0014] In a possible implementation, the control conversion module includes a conversion circuit, a protection circuit and a control unit circuit.

[0015] In a possible implementation, the conversion circuit includes a first rectifying and filtering circuit, a switching circuit, a second rectifying and filtering circuit, and a third rectifying and filtering circuit;

[0016] The input end of the first rectifying and filtering circuit is electrically connected to the output end of the safety module;

[0017] The output end of the first rectifying and filtering circuit is electrically connected to the input end of the switching circuit;

[0018] The switching circuit is inductively connected to the second rectifying and filtering circuit or the third rectifying and filtering circuit.

[0019] In a possible implementation, the protection circuit includes an over-temperature protection circuit, an overload protection circuit, and an over-voltage protection circuit;

[0020] An over-temperature protection circuit, used to obtain temperature information of the switching circuit and send the temperature information to the control unit circuit;

[0021] An overload protection circuit, used for obtaining voltage and current information of the switching circuit and sending the voltage and current information to a control unit circuit;

[0022] Overvoltage protection circuit, used to cut off the power supply when the voltage exceeds the set threshold.

[0023] In a possible implementation, the control unit circuit includes a control circuit and a detection circuit;

[0024] Control circuit, used to accurately control and adjust the output of the power supply according to voltage, current and temperature;

[0025] The detection circuit is used to monitor the voltage, current and temperature parameters of the power supply in real time and send the voltage, current and temperature parameters to the control circuit.

[0026] In a possible implementation, an electromagnetically shielded ventilated waveguide system is also included;

[0027] The electromagnetic shielding ventilated waveguide system comprises a plurality of waveguide units;

[0028] The waveguide unit is used to propagate electromagnetic signals of a specific frequency.

[0029] In a possible implementation, it also includes a communication interface;

[0030] The communication interface is RS-232 interface;

[0031] Communication interface, used to transmit power supply status information.

[0032] In a possible implementation, it also includes an external shielding chassis;

[0033] The safety module, control conversion module and post-filter module are installed in an external shielded chassis.

[0034] In a possible implementation, the material of the external shielding chassis is double-sided galvanized steel plate;

[0035] The thickness of the double-sided galvanized steel sheet is 2 mm.

[0036] The embodiment of this specification provides a filter power supply for EMC testing of aerospace products, characterized in that it includes a safety module, a control conversion module and a post-filter module; the input end of the safety module is suitable for electrical connection with an AC power supply; the output end of the safety module is electrically connected to the input end of the control conversion module; the output end of the control conversion module is electrically connected to the input end of the filter circuit; the safety module is used to protect the control conversion module from surge interference and filter out electromagnetic pollution generated when the control conversion module is working; the control conversion module is used to receive the AC power of the safety module and convert the AC power into DC power; the post-filter module is used to filter the DC power output by the control conversion module. In this way, the electromagnetic interference problem of the general power supply in the anechoic room or the problem that some tests cannot be realized due to the resonance of the power supply outside the anechoic room, the instability of low-voltage and high-current, and the interference of large power ripple on the EUT can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a circuit diagram of a filter power supply for EMC testing of aerospace products provided in one embodiment of this specification;

[0038] Figure 2 This is an architecture diagram of a filter power supply for EMC testing of aerospace products provided in one embodiment of this specification. DETAILED DESCRIPTION

[0039] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0040] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0041] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0042] In this specification, a filter power supply for EMC testing of aerospace products is provided, which is described in detail in the following embodiments.

[0043] See also Figure 1 , Figure 1 A circuit diagram of a filter power supply for EMC testing of aerospace products provided according to an embodiment of this specification is shown, including a safety module, a control conversion module and a post-filter module;

[0044] The input end of the safety module is suitable for electrical connection with an AC power supply; the output end of the safety module is electrically connected to the input end of the control conversion module; the output end of the control conversion module is electrically connected to the input end of the filter circuit; the safety module is used to protect the control conversion module from surge interference and filter out electromagnetic pollution generated when the control conversion module is working; the control conversion module is used to receive the AC power of the safety module and convert the AC power into DC power; the post-filter module is used to filter the DC power output by the control conversion module.

[0045] Among them, the safety module can be a pre-filter and protection unit, the control conversion module can include an AC / DC conversion and protection and control unit, and the post-filter module can be a post-filter unit.

[0046] In practical applications, there are pre-filtering and protection units, AC / DC conversion and protection and control units, and post-filtering units; the pre-filtering and protection unit is used to realize the AC / DC conversion and protection of the power supply system of the protection laboratory and the surge interference of the control unit, and to filter out the electromagnetic interference generated by the AC / DC conversion and protection and control unit during operation to the electromagnetic pollution of the anechoic chamber; the post-filtering unit is used to filter the continuously adjustable DC high-voltage output of the AC / DC conversion and protection and control unit.

[0047] In one possible implementation, the safety module includes a surge protection circuit and a pre-filter circuit; the surge protection circuit is used to protect the product from damage by surge voltage and current; the pre-filter circuit is used to process the input signal and filter out useless signals in other frequency bands except the target frequency band signal.

[0048] In practical applications, surge protection circuits protect products from damage caused by surge voltage and current. The pre-filter circuit set at the front end of signal processing processes the input signal and filters out useless signals in other frequency bands except the target frequency band signal.

[0049] Furthermore, the control conversion module includes a conversion circuit, a protection circuit and a control unit circuit.

[0050] In one possible implementation, the conversion circuit includes a first rectifier and filter circuit, a switching circuit, a second rectifier and filter circuit, and a third rectifier and filter circuit; the input end of the first rectifier and filter circuit is electrically connected to the output end of the safety module; the output end of the first rectifier and filter circuit is electrically connected to the input end of the switching circuit; the switching circuit is inductively connected to the second rectifier and filter circuit or the third rectifier and filter circuit.

[0051] In practical applications, the first rectifying and filtering circuit can be connected to the alternating current processed by the safety module, and converted into direct current of different specifications through the switching circuit and the second rectifying and filtering circuit or the third rectifying and filtering circuit.

[0052] In one possible implementation, the protection circuit includes an over-temperature protection circuit, an overload protection circuit and an overvoltage protection circuit; the over-temperature protection circuit is used to obtain temperature information of the switching circuit and send the temperature information to the control unit circuit; the overload protection circuit is used to obtain voltage and current information of the switching circuit and send the voltage and current information to the control unit circuit; the overvoltage protection circuit is used to cut off the power supply when the voltage exceeds a set threshold.

[0053] In practical applications, the over-temperature protection circuit can realize temperature control. When the circuit temperature is high, the temperature information is sent to the control unit circuit to adjust the temperature. The overload protection circuit can send the voltage and current information to the control unit circuit to adjust the output power when the load is too high. The overvoltage protection circuit can provide feedback to the control unit circuit when the voltage is too high, so that the power supply is cut off.

[0054] In one possible implementation, the control unit circuit includes a control circuit and a detection circuit; the control circuit is used to accurately control and adjust the output of the power supply according to the voltage, current and temperature; the detection circuit is used to monitor the voltage, current and temperature parameters of the power supply in real time, and send the voltage, current and temperature parameters to the control circuit.

[0055] In practical applications, the control circuit consists of a control chip, a feedback network and a drive circuit, which is responsible for monitoring the output voltage and current and accurately controlling and regulating the output of the power supply.

[0056] The detection circuit can monitor the voltage, current and temperature parameters of the power supply in real time during operation to ensure safe and stable operation of the power supply. When the output voltage exceeds the normal range (such as higher than the set maximum value or lower than the set minimum value), the detection circuit will send a signal to the control circuit to adjust the output to ensure stable output voltage. When the input voltage is too high, the protection mechanism will be triggered. The temperature of key components inside the power supply can also be monitored. When the temperature is too high, the detection circuit will trigger the heat sink to start to prevent damage to the device due to overheating.

[0057] In a possible implementation, it also includes an electromagnetic shielding ventilated waveguide system; the electromagnetic shielding ventilated waveguide system includes a plurality of waveguide units; the waveguide units are used to propagate electromagnetic signals of specific frequencies.

[0058] In practical applications, the electromagnetic shielding ventilation waveguide system is composed of many small waveguide units. These waveguides have cutoff characteristics for electromagnetic signals. Only electromagnetic signals of specific frequencies can propagate in them, and signals of other frequencies will be attenuated. It can prevent electromagnetic leakage or external electromagnetic interference while ensuring ventilation.

[0059] In a possible implementation, it also includes a communication interface; the communication interface is an RS-232 interface; the communication interface is used to transmit power supply status information.

[0060] In practical applications, the communication interface uses the RS-232 interface as a channel for data exchange between the power supply and external devices, and can transmit power supply status information such as voltage, current, temperature and other parameters.

[0061] In a possible implementation, an external shielding chassis is further included; the safety module, the control conversion module and the post-filter module are installed in the external shielding chassis. The material of the external shielding chassis is double-sided galvanized steel plate; the thickness of the double-sided galvanized steel plate is 2 mm.

[0062] In summary, this power supply system can realize 0-150VDC (maximum 50A) adjustable low ripple output technology (ripple <0.01%). Compared with the existing anechoic chamber power distribution scheme, this power supply system has the advantages of low ripple, low radiation, high reliability, lightweight, mobility, strong adaptability, etc. It can be used in various aerospace and rocket electromagnetic compatibility test occasions inside and outside the anechoic chamber.

[0063] In one embodiment, see Figure 2 , the total power of the AC / DC conversion power supply is 5100W, three-phase AC 380VAC input power supply, output 0~100VDC adjustable, maximum input current is 50A, built-in voltage and current monitoring and protection, with a variety of communication interfaces, can be program controlled. In order to better achieve the EMC output performance of the power supply, meet the test noise requirements, and the power supply's own environmental reliability requirements. Specific parameters are described below.

[0064] Input voltage range: three-phase 360-420VAC;

[0065] Frequency range: 47-63Hz;

[0066] Maximum power: 5100W;

[0067] Maximum output current: 100A (Max);

[0068] Output voltage range: 0-100VDC adjustable;

[0069] Efficiency: 90%

[0070] Accuracy: ±2%;

[0071] Ripple: 100mVP-p;

[0072] Overload, overvoltage, overtemperature protection, power output restart after recovery;

[0073] Isolation level: primary-secondary: 4KV, primary, secondary-ground 1.5KV;

[0074] Withstand voltage: I / PO / P: 2.5KV, I / P-FG: 2KV, O / P-FG: 1.5KV;

[0075] Insulation: I / PO / P: 100MΩ@500VDC;

[0076] Maximum leakage current: 5mA@220VAC;

[0077] Temperature rise: <30℃@25℃.

[0078] The embodiment of this specification provides a filter power supply for EMC testing of aerospace products, characterized in that it includes a safety module, a control conversion module and a post-filter module; the input end of the safety module is suitable for electrical connection with an AC power supply; the output end of the safety module is electrically connected to the input end of the control conversion module; the output end of the control conversion module is electrically connected to the input end of the filter circuit; the safety module is used to protect the control conversion module from surge interference and filter out electromagnetic pollution generated when the control conversion module is working; the control conversion module is used to receive the AC power of the safety module and convert the AC power into DC power; the post-filter module is used to filter the DC power output by the control conversion module. In this way, the electromagnetic interference problem of the general power supply in the anechoic room or the problem that some tests cannot be realized due to the resonance of the power supply outside the anechoic room, the instability of low-voltage and high-current, and the interference of large power ripple on the EUT can be solved.

[0079] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A filter power supply for EMC testing of aerospace products, characterized in that: It includes a safety module, a control conversion module and a post-filter module; The input terminal of the safety module is suitable for electrical connection to an AC power source; The output end of the safety module is electrically connected to the input end of the control conversion module; The output end of the control conversion module is electrically connected to the input end of the filter circuit; The safety module is used to protect the control conversion module from surge interference and filter out electromagnetic pollution generated when the control conversion module is working; A control conversion module, used for receiving the alternating current from the safety module and converting the alternating current into direct current; A post-filtering module is used to filter the direct current output by the control conversion module.

2. The filter power supply for EMC testing of aerospace products according to claim 1, characterized in that: The safety module includes a surge protection circuit and a pre-filter circuit; The surge protection circuit is used to protect the product from damage caused by surge voltage and current; The pre-filter circuit is used to process the input signal and filter out useless signals in other frequency bands except the target frequency band signal.

3. The filter power supply for EMC testing of aerospace products according to claim 1, characterized in that: The control conversion module includes a conversion circuit, a protection circuit and a control unit circuit.

4. The filter power supply for EMC testing of aerospace products according to claim 3, characterized in that: The conversion circuit includes a first rectifying and filtering circuit, a switching circuit, a second rectifying and filtering circuit and a third rectifying and filtering circuit; The input end of the first rectifying and filtering circuit is electrically connected to the output end of the safety module; The output end of the first rectifying and filtering circuit is electrically connected to the input end of the switching circuit; The switching circuit is inductively connected to the second rectifying and filtering circuit or the third rectifying and filtering circuit.

5. The filter power supply for EMC testing of aerospace products according to claim 4, characterized in that: The protection circuit includes an over-temperature protection circuit, an overload protection circuit and an over-voltage protection circuit; The over-temperature protection circuit is used to obtain temperature information of the switching circuit and send the temperature information to the control unit circuit; The overload protection circuit is used to obtain voltage and current information of the switching circuit and send the voltage and current information to the control unit circuit; The overvoltage protection circuit is used to cut off the power supply when the voltage exceeds a set threshold.

6. The filter power supply for EMC testing of aerospace products according to claim 3, characterized in that: The control unit circuit includes a control circuit and a detection circuit; The control circuit is used to accurately control and adjust the output of the power supply according to voltage, current and temperature; The detection circuit is used to monitor the voltage, current and temperature parameters of the power supply in real time, and send the voltage, current and temperature parameters to the control circuit.

7. The filter power supply for EMC testing of aerospace products according to claim 1, characterized in that: Also included is an electromagnetically shielded ventilated waveguide system; The electromagnetic shielding ventilated waveguide system comprises a plurality of waveguide units; The waveguide unit is used to propagate electromagnetic signals of a specific frequency.

8. The filter power supply for EMC testing of aerospace products according to claim 1, characterized in that: Also includes a communication interface; The communication interface is RS-232 interface; The communication interface is used to transmit power supply status information.

9. The filter power supply for EMC testing of aerospace products according to claim 1, characterized in that: Also included is an external shielded chassis; The safety module, control conversion module and post-filter module are installed in the external shielding chassis.

10. The filter power supply for EMC testing of aerospace products according to claim 9, characterized in that: The material of the external shielding chassis is double-sided galvanized steel plate; The thickness of the double-sided galvanized steel sheet is 2 mm.

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