Radio frequency channel switching control device and electromagnetic compatibility test system

Abstract

The utility model discloses a radio frequency channel switching control device and an electromagnetic compatibility test system. The radio frequency channel switching control device comprises an external power supply interface, a radio frequency signal input interface, a signal output unit, a switch control unit, a master control switch, a switch power supply, a relay connection circuit and a signal connection circuit board. The switching power supply is used for converting an alternating current power supply input by the AC power supply interface into a direct current to supply power to the relay connection circuit, and the switching control unit is used for outputting a radio frequency signal source input by the radio frequency signal input interface through the signal output unit by controlling a power supply of the relay connection circuit. Wherein in the signal output unit, the radio frequency signal source or the radio frequency signal source amplified by the pre-amplification circuit is output as a test signal source, so that the variety expansion of the test signal source is realized. As the signal output of each output interface of the radio frequency channel switching control device is controlled through the switch, the connection state of the radiation test equipment can be changed only by pressing and controlling operation, and the test efficiency is further improved on the premise of ensuring the minimum radiation interference.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicle detection, and in particular to a radio frequency channel switching control device and an electromagnetic compatibility testing system. Background Art

[0002] EMC testing, also known as electromagnetic compatibility (EMC) testing, refers to the comprehensive assessment of the electromagnetic interference (EMI) and anti-interference ability (EMS) of electronic products, and is one of the most important indicators of product quality. Due to its special use environment, industrial vehicles are inevitably affected by electromagnetic radiation interference from large equipment or walkie-talkie communication equipment. As the electrification level of industrial vehicles continues to increase, it is necessary to ensure that these vehicles have sufficient anti-radiation interference capabilities during normal use. As an important key component of the vehicle, the instrument displays the vehicle status in real time during the use of the vehicle, and some functions also involve safety issues. Therefore, it is necessary to test the radiation anti-interference ability of industrial vehicles and accessories involving electromagnetic compatibility. The electromagnetic compatibility measurement system consists of a test site and a test instrument. Among them, when building a test site, it is necessary to consider shielding non-test signal interference, and the instrument used for testing must also consider the interference of non-test signals caused by itself or interaction. In addition, when changing the radiation test signal during the test, manual switching is required, which not only affects the test efficiency, but also increases the impact of uncertain factors such as changes in the test environment due to changes in the connection interface. Summary of the invention

[0003] The technical problem to be solved by the present application is how to change the connection status of the radiation test equipment without physically changing the connection relationship of the test equipment during the EMC test process.

[0004] According to the first aspect, an embodiment provides a radio frequency channel switching control device, including a shielding shell; the shielding shell is provided with an external power supply interface, a radio frequency signal input interface, a signal output unit, a switch control unit and a master control switch; the shielding shell is provided with a switching power supply, a relay connection circuit and a signal connection circuit board;

[0005] The external power supply interface is connected to the switching power supply and is used to output the external input AC power to the switching power supply;

[0006] The switching power supply is connected to the master control switch and is used to convert the AC power into DC power for output;

[0007] The master control switch is connected to the switch control unit, and the master control switch is used to output the direct current output by the switch power supply to the switch control unit when it is turned on;

[0008] The switch control unit is connected to the relay connection circuit and is used to use the direct current output by the switch power supply as the working power supply of the relay connection circuit; the switch control unit controls the working state of the relay connection circuit by turning on or off the direct current;

[0009] The RF signal input interface is connected to the signal connection circuit board, and the RF signal input interface is used for inputting a RF signal source, and outputting the RF signal source to the signal connection circuit board through a communication RF cable;

[0010] The signal output unit includes at least two signal output interfaces; each of the signal output interfaces is connected to the signal connection circuit board via a communication radio frequency cable; the signal output unit is used to output a test signal source for testing;

[0011] The relay connection circuit is connected to the signal connection circuit board, and the relay connection circuit is used to respond to the on or off control of the switch control unit, and send the RF signal source input by the RF signal input interface to each of the signal output interfaces through the signal connection circuit board;

[0012] At least one signal output interface in the signal output unit is used to output the RF signal source input by the RF signal input interface as a first test signal source;

[0013] The RF channel switching control device also includes a preamplifier circuit, which is connected between one of the signal output interfaces and the signal connection circuit board through a communication RF cable. The signal output interface connected to the preamplifier circuit outputs the RF signal source amplified by the preamplifier circuit as a test second signal source.

[0014] In one embodiment, the RF channel switching control device also includes a high-pass filtering circuit and a pulse limiting circuit; the high-pass filtering circuit and the pulse limiting circuit are connected between a signal output interface and the signal connection circuit board through a communication RF cable, and the signal output interface connected to the high-pass filtering circuit and the pulse limiting circuit outputs the RF signal source after filtering and limiting by the high-pass filtering circuit and the pulse limiting circuit as a test third signal source.

[0015] In one embodiment, the signal output unit includes a first signal output interface, a second signal output interface and a third signal output interface; the first signal output interface is used to output the test first signal source, the second signal output interface is used to output the test second signal source, and the third signal output interface is used to output the test third signal source.

[0016] In one embodiment, the switch control unit includes a first control switch, a second control switch and a third control switch; the first control switch corresponds to the first signal output interface, and when the first control switch is turned on, the first signal output interface outputs the test first signal source, the second control switch corresponds to the second signal output interface, and when the second control switch is turned on, the second signal output interface outputs the test second signal source, and the third control switch corresponds to the third signal output interface, and when the third control switch is turned on, the third signal output interface outputs the test third signal source.

[0017] In one embodiment, the master control switch is a key switch; and / or the first control switch, the second control switch and the third control switch are push button switches.

[0018] In one embodiment, the first signal output interface, the second signal output interface and the third signal output interface are N-type RF connectors or SMA-type RF connectors inside the shielding shell, and are SMA-type RF connectors or N-type RF connectors outside the shielding shell.

[0019] In one embodiment, the external power interface is a power plug socket; the power plug socket includes a neutral wire connection terminal and a live wire connection terminal, the neutral wire connection terminal and the live wire connection terminal are respectively connected to the switching power supply through their own AC power conductors, and an electromagnetic shielding coil is provided on the AC power conductor connected to the live wire connection terminal to reduce electromagnetic interference of the AC power supply.

[0020] In one embodiment, the RF signal input interface is an N-type RF connector or an SMA-type RF connector inside the shielding shell, and is an SMA-type RF connector or an N-type RF connector outside the shielding shell.

[0021] According to the second aspect, an electromagnetic compatibility testing system is provided in one embodiment, comprising the radio frequency channel switching control device described in the first aspect.

[0022] In one embodiment, the electromagnetic compatibility test system further includes a signal generator, at least one power amplifier and / or a power test probe;

[0023] The signal generator is connected to the RF signal input interface of the RF channel switching control device, and is used to output the RF signal source to the RF channel switching control device;

[0024] The power amplifier is connected to a signal output interface in the signal output unit; the power amplifier is used to amplify the test signal source output by the radio frequency channel switching control device and then output it, so as to output a radiation signal of a preset test frequency band during electromagnetic compatibility testing;

[0025] The power test probe is connected to a signal output interface in the signal output unit and is used to monitor the forward power and / or reverse power of the power amplifier.

[0026] According to the electromagnetic compatibility test system of the above embodiment, the signal output of each output interface of the RF channel switching control device is controlled by a switch. The connection status of the radiation test equipment can be changed by simply pressing the control operation, thereby improving the test efficiency while ensuring the minimum radiation interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a structural block diagram of a radio frequency channel switching control device in an embodiment;

[0028] Figure 2 A schematic diagram of circuit connections of a radio frequency channel switching control device in an embodiment;

[0029] Figure 3 FIG. 4 is a structural block diagram of an electromagnetic compatibility test system in an embodiment. DETAILED DESCRIPTION

[0030] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0031] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0032] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0033] The RF electromagnetic field radiation immunity test system equipment built according to ISO11452-2 and GB / T33014.2 standards is expensive and complex. The standard requires the ability to test field strengths of up to 100V / m in the frequency range of 80MHz to 6GHz. According to the test standards and test requirements, during the test, the system software must use two power probes to simultaneously monitor the forward power and reverse power from each power amplifier and switch different power amplifier signal outputs. Therefore, an RF channel switching control device is required as a relay bridge for the detection system to connect the signal source, two power probes and at least two power amplifiers inside the system. An RF line connects the signal input of the signal source, and then at least two RF lines connect and output the signal of at least two power amplifiers, and connect two power probes. Finally, the signal switching of the power amplifier is realized to monitor the forward and reverse signal powers at the same time. At present, the RF communication switching devices in the RF electromagnetic field radiation immunity test system are mostly monopolized by imported manufacturers. They are expensive, have a long delivery time, require special software control and the software settings are cumbersome. In actual application, an engineer's misoperation often causes the entire test software to report an error, resulting in equipment control errors and the entire experiment cannot continue. Solving such software error problems often requires the manufacturer's professional after-sales technical engineers to handle, and in actual application, it is difficult to adapt or upgrade and expand according to personalized needs.

[0034] Embodiment 1:

[0035] Please refer to Figure 1, is a structural block diagram of a radio frequency channel switching control device in an embodiment, the radio frequency channel switching control device comprises a shielding shell, the shielding shell is provided with an external power interface 10, a radio frequency signal input interface 60, a signal output unit 80, a switch control unit 40 and a master switch 20, and the shielding shell is provided with a switch power supply 30, a relay connection circuit 50 and a signal connection circuit board 70. The external power interface 10 is connected to the switch power supply 30, and the external power interface 10 is used to output the external input AC power to the switch power supply 30. The switch power supply 30 is connected to the master switch 20, and the switch power supply 30 is used to convert the AC power into DC power and then output it. The master switch 20 is connected to the switch control unit 40, and the master switch 20 is used to output the DC power output by the switch power supply 30 to the switch control unit 40 when it is turned on. The switch control unit 40 is connected to the relay connection circuit 50, and the switch control unit 40 is used to use the DC power output by the switch power supply 30 as the working power supply of the relay connection circuit 50. The switch control unit 40 controls the working state of the relay connection circuit 50 by turning on or off the DC power. The RF signal input interface 60 is connected to the signal connection circuit board 70. The RF signal input interface 60 is used to input the RF signal source and output the RF signal source to the signal connection circuit board 70 through the communication RF cable. The signal output unit 80 includes at least two signal output interfaces, each of which is connected to the signal connection circuit board 70 through a communication RF cable. The signal output unit 80 is used to output a test signal source for testing.

[0036] The relay connection circuit 50 is connected to the signal connection circuit board 70. The relay connection circuit 50 is used to respond to the on / off control of the switch control unit 40, and send the RF signal source input from the RF signal input interface 60 to each signal output interface through the signal connection circuit board 70. At least one signal output interface in the signal output unit 80 is used to output the RF signal source input from the RF signal input interface 60 as a test first signal source.

[0037] Please refer to Figure 2 , is a circuit connection diagram of a radio frequency channel switching control device in an embodiment, the radio frequency channel switching control device also includes a preamplifier circuit 84 arranged in a shielding shell 90, the preamplifier circuit 84 is connected between a signal output interface and a signal connection circuit board 70 through a communication radio frequency cable 91, and the signal output interface connected to the preamplifier circuit 84 outputs the radio frequency signal source amplified by the preamplifier circuit 84 as a test second signal source.

[0038] In one embodiment, the RF channel switching control device also includes a high-pass filter circuit 85 and a pulse limiting circuit 86, which are connected in series between a signal output interface and a signal connection circuit board 70 via a communication RF cable 91. The signal output interface connected to the high-pass filter circuit 85 and the pulse limiting circuit 86 outputs the RF signal source after filtering and limiting by the high-pass filter circuit and the pulse limiting circuit as a test third signal source.

[0039] In one embodiment, the signal output unit 80 includes a first signal output interface 81, a second signal output interface 82, and a third signal output interface 83. The first signal output interface 81 is used to output a first signal source for testing, the second signal output interface 82 is used to output a second signal source for testing, and the third signal output interface 83 is used to output a third signal source for testing. In one embodiment, the switch control unit 40 includes a first control switch 41, a second control switch 42, and a third control switch 43. The first control switch 41 corresponds to the first signal output interface 81. When the first control switch 41 is turned on, the first signal output interface 81 outputs the first signal source for testing. The second control switch 42 corresponds to the second signal output interface 82. When the second control switch 42 is turned on, the second signal output interface 82 outputs the second signal source for testing. The third control switch 42 corresponds to the third signal output interface 83. When the third control switch 43 is turned on, the third signal output interface 83 outputs the third signal source for testing.

[0040] In one embodiment, the master control switch 20 is a key switch. In one embodiment, the first control switch 41, the second control switch 42 and the third control switch 43 are push-button switches. In one embodiment, the first signal output interface 81, the second signal output interface 82 and the third signal output interface 83 are N-type RF connectors or SMA-type RF connectors inside the shielding shell 90, and are SMA-type RF connectors or N-type RF connectors outside the shielding shell 90. In one embodiment, the external power supply interface 10 is a power plug female socket. The power plug female socket includes a neutral wire connection terminal and a live wire connection terminal, and the neutral wire connection terminal and the live wire connection terminal are respectively connected to the switching power supply 30 through their own AC wires, and an electromagnetic shielding coil is provided on the AC wire connected to the live wire connection terminal to reduce the electromagnetic interference of the AC power supply. In one embodiment, the RF signal input interface 60 is an N-type RF connector or an SMA-type RF connector inside the shielding shell 90, and is an SMA-type RF connector or an N-type RF connector outside the shielding shell 90.

[0041] Please refer to Figure 3, is a structural block diagram of an electromagnetic compatibility test system in an embodiment. In one embodiment of the present application, an electromagnetic compatibility test system is also disclosed, including the RF channel switching control device 100 as described above. In one embodiment, the electromagnetic compatibility test system also includes a signal generator 200, which is connected to the RF signal input interface of the RF channel switching control device 100 and is used to output a RF signal source to the RF channel switching control device 100. In one embodiment, the electromagnetic compatibility test system also includes at least one power amplifier 300, which is connected to a signal output interface in the signal output unit of the RF channel switching control device 100, and the power amplifier 300 is used to amplify and output the test signal source output by the RF channel switching control device 100, so as to output a radiation signal of a preset test frequency band during the electromagnetic compatibility test. In one embodiment, the electromagnetic compatibility test system also includes at least one power test probe 400, which is connected to a signal output interface in the signal output unit of the RF channel switching control device 100 and is used to monitor the forward power and / or reverse power of the power amplifier 300.

[0042] The working principle and use method of the radio frequency channel switching control device disclosed in the present application are described below by using specific embodiments, specifically including:

[0043] like Figure 3As shown, the power socket of the three-socket external power interface 10 is, the switching power supply 30 is an AC220V to DC12V switching power supply, and the power socket is directly connected to the AC220V to DC12V switching power supply 30. The positive and negative poles of the key power switch (master control switch 20) are directly connected to the positive and negative poles of the switching power supply 40. The relay connection circuit 50 includes three 12V relays, the positive pole of the three relays is connected to the positive pole of the key power switch, and the negative pole is connected to the negative pole of the switching power supply 30. Three button switches (the first control switch 41, the second control switch 42 and the third control switch 43) are respectively connected to the input end and the output end of the three relays. The RF signal input interface 60 is connected to the output end of the three-way relay, and the output end is connected to the N-type female to SMA-type female coaxial connector through the switch-specific RF cable connection line. All RF cables and RF connectors used have the advantages of low loss, high steady state and low standing wave in the frequency range of 9kHz-18GHz. The first signal output interface 81, the second signal output interface 82 and the third signal output interface 83 are respectively provided with coaxial RF interfaces on both sides of the shielding shell 90, wherein the first signal output interface 81 is directly connected to the coaxial interface through a cable connection line, and the third signal output interface 83 is connected in series with the pulse limiting circuit 86 and the high-pass filter circuit 85 through the RF cable connection line and then connected to the coaxial interface, wherein the maximum allowable signal power of the pulse limiting circuit 86 is 1W, and the signal attenuation value in the DC-250MHz frequency range is 20dB, and the maximum allowable signal power of the high-pass filter circuit 85 is 1W, and it has the advantages of signal attenuation as low as 0.5dB in the frequency range of 150kHz-300MHz, low standing wave, and signal attenuation of more than 50dB outside the frequency band. The second signal output interface 82 is connected in series with the preamplifier circuit 84 through a cable connection line and then connected to the coaxial interface. The preamplifier circuit 84 can provide a gain of 30dB in the frequency range of 9kHz-6GHz and maintain good flatness. According to different test application requirements, the frequency range and amplification gain can also be widened and improved to meet higher test requirements. The preamplifier circuit 84 is connected to a relay of the relay connection circuit 50 through a cable connection line.

[0044] The RF channel switching control device disclosed in this application is suitable for the field of automotive electronic electromagnetic compatibility testing. The device can also be used in the testing field of communication products and intelligent network products. The designed one-to-three RF switching device has three signal channels that can switch channels freely in the laboratory according to the test project requirements. Of course, it can also be upgraded and customized according to different user needs. After the RF switching device is plugged in the power supply and the input and output RF cables are connected, the product can be controlled by the button switch. It is easy to operate and has stable and reliable performance. The three-channel output can meet the corresponding radiation interference and conducted interference test requirements of new energy vehicle parts during EMI testing. When doing the radiation interference test of the product, the receiver is connected to the receiving antenna through the RF switching device. Since the spatial radiation interference of the product under test is mainly received, the spatial radiation interference ability is relatively small and difficult to capture. It is hoped that the attenuation in the system link is as small as possible. At this time, the first channel should be used to do the product radiation interference test. When doing CE testing of products, especially new energy high-voltage components such as on-board chargers, DCDC, DCAC, battery packs, motors and motor controllers, the product interference characteristics are strong electromagnetic signals, often accompanied by pulse signals, wide interference frequency bands, and large interference in out-of-band frequency bands that are not concerned with or required by the standards, which often interfere with accurate measurements within the frequency bands required by the standards. At this time, we should choose the second channel for CE testing, because the second channel integrates a pulse limiter circuit to effectively prevent signal overload, weaken the impact of pulse signals, and protect expensive precision instruments; and because the integrated high-pass filter circuit can effectively filter out interference signals outside the test frequency band below 150kHz, protect the receiver or spectrum analyzer from overload or damage due to excessive out-of-band signals, and ensure test accuracy. In addition, when the product is tested for level 5 of radiated interference or conducted interference according to the CISPR25 standard, since the standard limit of level 5 is very low, it makes more stringent requirements on the external electromagnetic interference of the product. It is difficult for the conventional test system to meet the standard requirement of more than 6dB below the standard limit. Generally, for practical laboratory applications, the greater the margin of the system noise floor relative to the limit, the more conducive to measurement observation and evaluation. At this time, the third channel should be used to test this requirement. The third channel integrates a preamplifier circuit with a gain of 30dB in the 9KHz-6GHz range, which can effectively reduce the system bottom noise and improve the test dynamic range and test sensitivity.

[0045] In summary, the electromagnetic compatibility test system disclosed in the present application, the radio frequency switching device commonly used in the electromagnetic compatibility EMI test of new energy vehicle components and new energy vehicle complete vehicles can ensure the fast link switching for different test requirements during the test process, and reduce the test errors caused by human factors. The preamplifier circuit can effectively improve the dynamic range of the test system, reduce the bottom noise, and ensure the test requirements within the 10dB range of the Class5 limit line. The internal pulse limiting circuit and high-pass filter circuit can effectively attenuate the product's unintentional overload signals and transient pulse signals, ensuring the safety of the test link and the safety of the entire system equipment.

[0046] The channel switching control device disclosed in the present application includes an external power supply interface, a radio frequency signal input interface, a signal output unit, a switch control unit, a master control switch, a switching power supply, a relay connection circuit and a signal connection circuit board. The switching power supply is used to convert the AC power input from the AC power supply interface into DC power to power the relay connection circuit, and the switch control unit is used to output the radio frequency signal source input from the radio frequency signal input interface through the signal output unit by controlling the power supply of the relay connection circuit. Among them, in the signal output unit, the radio frequency signal source or the radio frequency signal source amplified by the preamplifier circuit is output as a test signal source to achieve the expansion of the types of test signal sources. Since the signal output of each output interface of the radio frequency channel switching control device is controlled by a switch, the connection state of the radiation test equipment can be changed by simply pressing the control operation, thereby improving the test efficiency while ensuring the minimum radiation interference.

[0047] The above specific examples are used to illustrate the present invention, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. A radio frequency channel switching control device, characterized in that: It comprises a shielding shell; the shielding shell is provided with an external power supply interface, a radio frequency signal input interface, a signal output unit, a switch control unit and a master control switch; the shielding shell is provided with a switch power supply, a relay connection circuit and a signal connection circuit board; The external power supply interface is connected to the switching power supply and is used to output the external input AC power to the switching power supply; The switching power supply is connected to the master control switch and is used to convert the AC power into DC power for output; The master control switch is connected to the switch control unit, and the master control switch is used to output the direct current output by the switch power supply to the switch control unit when it is turned on; The switch control unit is connected to the relay connection circuit and is used to use the direct current output by the switch power supply as the working power supply of the relay connection circuit; the switch control unit controls the working state of the relay connection circuit by turning on or off the direct current; The RF signal input interface is connected to the signal connection circuit board, and the RF signal input interface is used for inputting a RF signal source, and outputting the RF signal source to the signal connection circuit board through a communication RF cable; The signal output unit includes at least two signal output interfaces; each of the signal output interfaces is connected to the signal connection circuit board via a communication radio frequency cable; the signal output unit is used to output a test signal source for testing; The relay connection circuit is connected to the signal connection circuit board, and the relay connection circuit is used to respond to the on or off control of the switch control unit, and send the RF signal source input by the RF signal input interface to each of the signal output interfaces through the signal connection circuit board; At least one signal output interface in the signal output unit is used to output the RF signal source input by the RF signal input interface as a first test signal source; The RF channel switching control device also includes a preamplifier circuit, which is connected between one of the signal output interfaces and the signal connection circuit board through a communication RF cable. The signal output interface connected to the preamplifier circuit outputs the RF signal source amplified by the preamplifier circuit as a test second signal source.

2. The radio frequency channel switching control device according to claim 1, characterized in that: The RF channel switching control device also includes a high-pass filtering circuit and a pulse limiting circuit; the high-pass filtering circuit and the pulse limiting circuit are connected between a signal output interface and the signal connection circuit board through a communication RF cable, and the signal output interface connected to the high-pass filtering circuit and the pulse limiting circuit outputs the RF signal source after filtering and limiting by the high-pass filtering circuit and the pulse limiting circuit as a test third signal source.

3. The radio frequency channel switching control device according to claim 2, characterized in that: The signal output unit includes a first signal output interface, a second signal output interface and a third signal output interface; the first signal output interface is used to output the first test signal source, the second signal output interface is used to output the second test signal source, and the third signal output interface is used to output the third test signal source.

4. The radio frequency channel switching control device according to claim 3, characterized in that: The switch control unit includes a first control switch, a second control switch and a third control switch; the first control switch corresponds to the first signal output interface, and when the first control switch is turned on, the first signal output interface outputs the test first signal source; the second control switch corresponds to the second signal output interface, and when the second control switch is turned on, the second signal output interface outputs the test second signal source; the third control switch corresponds to the third signal output interface, and when the third control switch is turned on, the third signal output interface outputs the test third signal source.

5. The radio frequency channel switching control device according to claim 4, characterized in that: The master control switch is a key switch; and / or the first control switch, the second control switch and the third control switch are push button switches.

6. The radio frequency channel switching control device according to claim 4, characterized in that: The first signal output interface, the second signal output interface and the third signal output interface are N-type RF connectors or SMA-type RF connectors inside the shielding shell, and are SMA-type RF connectors or N-type RF connectors outside the shielding shell.

7. The radio frequency channel switching control device according to claim 1, characterized in that: The external power interface is a power plug socket; the power plug socket includes a neutral wire connection terminal and a live wire connection terminal, the neutral wire connection terminal and the live wire connection terminal are respectively connected to the switching power supply through their own AC power conductors, and an electromagnetic shielding coil is arranged on the AC power conductor connected to the live wire connection terminal to reduce electromagnetic interference of the AC power supply.

8. The radio frequency channel switching control device according to claim 1, characterized in that: The RF signal input interface is an N-type RF connector or an SMA-type RF connector inside the shielding shell, and is an SMA-type RF connector or an N-type RF connector outside the shielding shell.

9. An electromagnetic compatibility test system, characterized in that: It comprises the radio frequency channel switching control device as claimed in any one of claims 1 to 8.

10. The electromagnetic compatibility test system according to claim 9, characterized in that: Also includes a signal generator, at least one power amplifier and / or a power test probe; The signal generator is connected to the RF signal input interface of the RF channel switching control device, and is used to output the RF signal source to the RF channel switching control device; The power amplifier is connected to a signal output interface in the signal output unit; the power amplifier is used to amplify the test signal source output by the radio frequency channel switching control device and then output it, so as to output a radiation signal of a preset test frequency band during electromagnetic compatibility testing; The power test probe is connected to a signal output interface in the signal output unit and is used to monitor the forward power and / or reverse power of the power amplifier.

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