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 AC power supply interface, a radio frequency signal input interface, a first group of output interfaces, a second group of output interfaces, a switching power supply, a switching control unit, 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 first output interface and the second output interface by controlling the power supply of the relay connection circuit; the number of output interfaces of the radio frequency signal source is expanded, so that the radio frequency signal source is respectively output to a power amplifier, a power test probe and the like. The signal output of each output interface of the radio frequency channel switching control device is controlled through the switch, so that the connection state of the radiation test equipment can be changed without manual switching, and the test efficiency is improved on the premise of ensuring the minimum radiation interference.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic compatibility testing, 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 AC power interface, a radio frequency signal input interface, a first group of output interfaces and a second group of output interfaces; the shielding shell is provided with a switching power supply, a switch control unit, a relay connection circuit and a signal connection circuit board;

[0005] The AC power 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 switch control unit and is used to convert the alternating current into direct current, and use the direct current as the working power supply of the relay connection circuit through the switch control unit;

[0007] The switch control unit is connected to the relay connection circuit and is used to control the working state of the relay connection circuit by switching on or off the direct current;

[0008] 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;

[0009] The signal connection circuit board is respectively connected to the relay connection circuit, the first group of output interfaces and the second group of output interfaces, and the signal connection circuit board is used to electrically connect the radio frequency signal input interface and the first group of output interfaces; and / or the signal connection circuit board is also used to electrically connect the first group of output interfaces and the second group of output interfaces;

[0010] The first group of output interfaces and the second group of output interfaces are used to output the RF signal source;

[0011] The RF signal input interface includes at least one input connection terminal, and the input connection terminal is connected to the signal connection circuit board through a communication RF cable; the first group of output interfaces includes at least two output connection terminals, and each of the output connection terminals is respectively connected to the signal connection circuit board through a communication RF cable; the second group of output interfaces includes at least two groups of expansion connection ports, each group of expansion connection ports includes at least two expansion output terminals, and each of the expansion output terminals in the second group of output interfaces is respectively connected to the signal connection circuit board through a communication RF cable;

[0012] The switch control unit includes a first switch device, a second switch device and a third switch device;

[0013] The relay connection circuit includes a first group of relays, a second group of relays and a third group of relays, wherein the first group of relays, the second group of relays and the third group of relays each include at least one relay, each of the relays includes a control connection terminal and a response connection terminal, and when the control connection terminal is connected to the direct current, the response connection terminals are electrically connected together;

[0014] The first switch device is connected to the switch power supply, the second switch device, the third switch device and the first group of relays respectively. When the first switch device is turned on, the second switch device and the third switch device are electrically connected to the switch power supply. When the first switch device is turned on, the direct current is also output to the control connection end of the first group of relays to be electrically connected to the response connection end of the first group of relays;

[0015] The second switch device is connected between the first switch device and the control connection terminal of the second group of relays, and when the first switch device is turned on and the second switch device is turned on, the switch control unit outputs the direct current to the control connection terminal of the second group of relays to electrically connect the response connection terminal of the second group of relays;

[0016] The third switch device is connected between the first switch device and the control connection terminal of the third group of relays. When the first switch device is turned on and the third switch device is turned on, the switch control unit outputs the direct current to the control connection terminal of the third group of relays to electrically connect the response connection terminal of the third group of relays.

[0017] The signal connection circuit board comprises at least three groups of relay connection terminals, at least one group of input-end connection terminals and at least two groups of output-end connection terminals, each group of the relay connection terminals is connected to a group of relays in the relay connection circuit, and each group of the input-end connection terminals is connected to the input connection terminals of the RF signal input interface through a communication RF cable; the two groups of the output-end connection terminals are respectively electrically connected to one output connection terminal of the first group of output interfaces through a communication RF cable;

[0018] When the control connection end of the first group of relays is connected to the direct current, the signal connection circuit board outputs the RF signal source input by the input connection terminal of the RF signal input interface through each of the output connection terminals of the first group of output interfaces;

[0019] When the control connection ends of the second group of relays and / or the third group of relays are connected to the direct current, the signal connection circuit board connects the output connection terminals of the first group of output interfaces with the extended output terminals of the second group of output interfaces to expand the number of interfaces for the RF channel switching control device to output the RF signal source.

[0020] In one embodiment, the first switch device is a key switch; and / or the second switch device and / or the third switch device is a push button switch.

[0021] In one embodiment, the AC 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.

[0022] 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.

[0023] In one embodiment, the first group of output interfaces and / or the second group of output interfaces 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.

[0024] According to the second aspect, an electromagnetic compatibility testing system is provided in one embodiment, comprising the radio frequency channel switching control device as described in the first aspect.

[0025] In one embodiment, the electromagnetic compatibility testing system further includes a signal generator, which 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.

[0026] In one embodiment, the electromagnetic compatibility testing system also includes at least one power amplifier, which is connected to the first group of output interfaces of the RF channel switching control device; the power amplifier is used to amplify the RF signal source output by the RF 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.

[0027] In one embodiment, the electromagnetic compatibility testing system includes at least two power amplifiers with different amplification powers, each of which is respectively connected to one of the output connection terminals of the first group of output interfaces; each of the power amplifiers outputs radiation signals of different preset test frequency bands.

[0028] In one embodiment, the electromagnetic compatibility test system further includes at least one power test probe, which is connected to the second group of output interfaces of the RF channel switching control device and is used to monitor the forward power and / or reverse power of the power amplifier.

[0029] 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, and the connection state of the radiation test equipment can be changed without manual switching, thereby improving the test efficiency while ensuring the minimum radiation interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a structural block diagram of a radio frequency channel switching control device in an embodiment;

[0031] Figure 2 A structural block diagram of an electromagnetic compatibility test system in an embodiment;

[0032] Figure 3 FIG. 4 is a circuit connection diagram of a radio frequency channel switching control device in another embodiment. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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).

[0036] 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.

[0037] Embodiment 1:

[0038] 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 includes a shielding shell, an AC power interface 10, a radio frequency signal input interface 60, a first group of output interfaces 70 and a second group of output interfaces 80 are arranged on the shielding shell, and a switching power supply 20, a switch control unit 30, a relay connection circuit 40 and a signal connection circuit board 50 are arranged in the shielding shell. The AC power interface 10 is connected to the switching power supply 20, and the AC power interface 10 is used to output the external input AC power to the switching power supply 20. The switching power supply 20 is connected to the switch control unit 30, and the switching power supply 20 is used to convert the AC power into DC power, and use the DC power as the working power supply of the relay connection circuit 40 through the switch control unit 30. The switch control unit 30 is connected to the relay connection circuit 40, and is used to control the working state of the relay connection circuit 40 by turning on or off the DC power. The radio frequency signal input interface 60 is connected to the signal connection circuit board 50, and the radio frequency signal input interface 60 is used to input the radio frequency signal source, and output the radio frequency signal source to the signal connection circuit board 50 through the communication radio frequency cable. The signal connection circuit board 50 is connected to the relay connection circuit 40, the first group of output interfaces 70 and the second group of output interfaces 80 respectively, and the signal connection circuit board 50 is used to electrically connect the RF signal input interface 60 and the first group of output interfaces 70. The signal connection circuit board 50 is also used to electrically connect the first group of output interfaces 70 and the second group of output interfaces 80. The first group of output interfaces 70 and the second group of output interfaces 80 are used to output RF signal sources. The RF signal input interface 60 includes at least one input connection terminal, which is connected to the signal connection circuit board 50 through a communication RF cable. The first group of output interfaces 70 includes at least two output connection terminals, each of which is connected to the signal connection circuit board 50 through a communication RF cable. The second group of output interfaces 80 includes at least two groups of extended connection ports, each group of extended connection ports includes at least two extended output terminals, and each extended output terminal in the second group of output interfaces 80 is connected to the signal connection circuit board 50 through a communication RF cable. The switch control unit 30 includes a first switch device, a second switch device and a third switch device. The relay connection circuit 40 includes a first group of relays, a second group of relays and a third group of relays. The first group of relays, the second group of relays and the third group of relays each include at least one relay. Each relay includes a control connection terminal and a response connection terminal. When the control connection terminal is connected to direct current, the response connection terminals are electrically connected together. The first switch device is respectively connected to the switching power supply 20, the second switch device, the third switch device and the first group of relays. When the first switch device is turned on, the second switch device and the third switch device are electrically connected to the switching power supply 20. When the first switch device is turned on, the direct current is also output to the control connection terminal of the first group of relays to electrically connect the response connection terminal of the first group of relays.The second switch device is connected between the first switch device and the control connection end of the second group of relays. When the first switch device is turned on and the second switch device is turned on, the switch control unit 30 outputs direct current to the control connection end of the second group of relays to electrically connect the response connection end of the second group of relays. The third switch device is connected between the first switch device and the control connection end of the third group of relays. When the first switch device is turned on and the third switch device is turned on, the switch control unit 30 outputs direct current to the control connection end of the third group of relays to electrically connect the response connection end of the third group of relays. The signal connection circuit board 50 includes at least three groups of relay connection terminals, at least one group of input connection terminals and at least two groups of output connection terminals. Each group of relay connection terminals is connected to a group of relays in the relay connection circuit 40, and each group of input connection terminals is connected to the input connection terminal of the RF signal input interface 60 through a communication RF cable. The two groups of output connection terminals are respectively electrically connected to an output connection terminal of the first group of output interface 70 through a communication RF cable. When the control connection end of the first group of relays is connected to direct current, the signal connection circuit board 50 outputs the RF signal source input by the input connection terminal of the RF signal input interface 60 through each output connection terminal of the first group of output interfaces 70. When the control connection end of the second group of relays and / or the third group of relays is connected to direct current, the signal connection circuit board 50 connects the output connection terminal of the first group of output interfaces with the extended output terminal of the second group of output interfaces to expand the number of interfaces for outputting the RF signal source of the RF channel switching control device.

[0039] In one embodiment, the first switch device is a key switch. In one embodiment, the second switch device and / or the third switch device is a push button switch.

[0040] In one embodiment, the AC power interface 10 is a power plug socket. The power plug socket includes a neutral connection terminal and a live connection terminal, which are respectively connected to the switching power supply 20 through their own AC wires, and an electromagnetic shielding coil is provided on the AC wire connected to the live 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, and an SMA-type RF connector or an N-type RF connector outside the shielding shell. In one embodiment, the first group of output interfaces 70 and / or the second group of output interfaces 80 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.

[0041] Please refer to Figure 2, 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 the first group of output interfaces of the RF channel switching control device 100, and the power amplifier 300 is used to amplify and output the RF 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 includes at least two power amplifiers with different amplification powers, each of which is respectively connected to an output connection terminal of the first group of output interfaces, and each of which outputs radiation signals of different preset test frequency bands. In one embodiment, the electromagnetic compatibility test system further includes at least one power test probe 400 , which is connected to the second group of output interfaces 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 following describes the implementation of the radio frequency channel switching control device disclosed in the present application through a specific embodiment, which specifically includes:

[0043] Please refer to Figure 3, is a circuit connection diagram of a radio frequency channel switching control device in another embodiment, the radio frequency channel switching control device is applied to the electromagnetic compatibility radiation immunity test, the radio frequency channel switching control device comprises a shielding shell 1, the shielding shell 1 is provided with an AC power interface 10, a radio frequency signal input interface 60, a first group of output interfaces 70 and a second group of output interfaces 80, and the shielding shell 1 is provided with a switching power supply 20, a switch control unit, a relay connection circuit 40 and a signal connection circuit board 50. The AC power interface 10 is an AC power socket, which is a single-phase three-wire socket connected to the AC220V mains power. The AC power socket is placed on the shielding shell 1, and the AC power socket includes a neutral wire, a live wire and a ground wire, wherein the ground wire can well ground the radio frequency channel switching control device, and play a role in discharging static electricity and protecting against electric shock. An electromagnetic shielding coil 11 is provided on the live wire connected to the switching power supply 20, so that the live wire is surrounded by 5 circles, which can obtain good electromagnetic shielding and purify the electromagnetic noise interference from the mains. The switching power supply 20 is a switching power supply that converts AC220V to DC12V. The power socket is connected to the positive and negative poles and the grounding terminal of the switching power supply 20 through the electromagnetic shielding coil 11 through the neutral wire, the live wire and the ground wire, so as to provide 12V DC power for each component inside the device. The switch control unit includes a first switch device 31, a second switch device 32 and a third switch device 33. The first switch device 31 is a key switch, and the second switch device 32 and the third switch device 33 are lighted push button switches. The key switch is installed on the shielding shell 1, and its positive and negative poles will be connected to the positive and negative poles of the switching power supply, which plays a role in controlling the power on and off of the entire RF channel switching control device. The relay connection circuit 40 includes a three-way relay, and the positive and negative terminals of the second switch device 32 and the third switch device 33 are respectively connected to the three-way relay. The relay and the signal connection circuit board 50 respectively control the on and off of the first group of output interfaces 70 and the second group of output interfaces 80 at the rear end and the communication link switching. The three-way relay uses a neutral wire and a live wire to connect the key power switch. The control connection end of the three-way relay is respectively connected to the second switch device 32 and the third switch device 33. The normally open ports of the three-way relay are respectively connected to two button switches, playing the role of a connecting button switch. The on and off of the rear-end RF switch circuit and the communication link switching can be controlled by simple button switch operation. The operation is simple, the maintenance cost is reduced, the time for personnel operation or manual cable replacement is saved, the probability of personnel misoperation is reduced, and the test efficiency and accuracy are improved.

[0044] The signal connection circuit board 50 is connected to the RF signal input interface 60, the first output interface 70 and the second output interface 80 through three groups of RF switch devices, communication RF cables and SMA to N-type RF connectors. It is composed of three groups of RF devices with frequencies of 9KHz to 18GHz, high power and low loss, which can realize the switching of RF transmission lines and the switching of power amplifiers with different frequency band bandwidths. Among them, the RF communication cable is nine RF cables with 8KHz to 18GHz, high power and low loss, and SMA type connectors at both ends. One end of the cable is connected to the three groups of RF switch devices, and the other end is connected to the SMA to N-type RF connector. There are a total of 9 SMA to N-type RF connectors, which are through-the-wall type and fixedly installed on the shielding shell 1 using nuts. The frequency covers 9KHz to 18GHz, and it has high-power and low-loss RF characteristics. 8 of the 9 RF connectors are installed on the upper side of the shielding shell 1, and 1 is installed on the lower side of the shielding shell 1. One end inside the shielding shell 1 is an SMA-type connector, which is connected to the communication RF cable respectively. One end of the shielding shell 1 is an N-type connector, which is connected to the RF line of the RF signal input end from the signal source, the signal input end of the power amplifier in the power amplifier room, the forward power and reverse power ports of the power amplifier in the power amplifier room, and the power probe for detecting the reverse power and forward power. Each group of negative poles of the RF switch device is connected to the negative circuit of the adapter power board, and the positive circuit is respectively connected to the three control ports of the three-way relay circuit board. Each group of RF switch devices has three SMA RF connectors. The SMA RF connector is connected to the SMA port inside the SMA-to-N-type RF connector chassis through a communication RF cable. RF connector 8-1 is connected to the SMA-to-N-type RF connector 9-1 through a communication RF cable. RF connector 8-2 is connected to the SMA-to-N-type RF connector 9-2 through a communication RF cable. RF connector 8-3 is connected to the SMA-to-N-type RF connector through a communication RF cable. The RF connector 8-4 is connected to the SMA to N-type RF connector 9-4 through a communication RF cable, the RF connector 8-5 is connected to the SMA to N-type RF connector 9-5 through a communication RF cable, the RF connector 8-6 is connected to the SMA to N-type RF connector 9-6 through a communication RF cable, the RF connector 8-7 is connected to the SMA to N-type RF connector 9-7 through a communication RF cable, the RF connector 8-8 is connected to the SMA to N-type RF connector 11 through a communication RF cable, and the RF connector 8-9 is connected to the SMA to N-type RF connector 9-8 through a communication RF cable.

[0045] In one embodiment, the reference is the frequency range of 80MHz to 6GHz and the field strength level is 54V / m, so the main equipment of the electromagnetic compatibility test system includes a signal source, a radio frequency channel switching control device, two power probes, nine high-power and low-loss radio frequency cables, two power amplifiers, and the back end also has similar frequency cables and transmitting antennas that are not described one by one. The two power amplifiers are generally divided into one each for 80MHz to 1GHz and 1GHz to 6GHz. In the actual test process, different power amplifiers need to be switched according to different test frequency bands, and the power probes need to be used to detect the forward and reverse power of the power amplifier at the same time. If manual operation is required for each switching of the equipment, the problem is that multiple radio frequency cables need to be replaced at the same time, the probability of misoperation is high, the equipment loss increases, and the work efficiency is low, so the radio frequency channel switching control device perfectly solves this problem. In the electromagnetic compatibility test system, a signal source is connected to the RF input port 60 of the RF channel switching control device through an N-to-N type RF cable, the signal input, forward power and reverse power ports of a power amplifier with a frequency of 80MHz to 1GHz are respectively connected to the SMA-to-N type RF connectors 9-8, 9-6 and 9-4 of the RF communication switching switch device, the signal input, forward power and reverse power ports of a power amplifier with a frequency of 1GHz to 6GHz are respectively connected to the SMA-to-N type RF connectors 9-7, 9-3 and 9-1 of the RF communication switching switch device, two power probes are respectively connected to the SMA-to-N type RF connectors 9-5 and 9-2 of the RF channel switching control device, and finally the signal outputs of the two power amplifiers are connected to the transmitting antenna in the darkroom through the rear-end RF cable and the interface board on the wall of the shielded power amplifier room, thus forming a complete set of electromagnetic compatibility test system.

[0046] The channel switching control device disclosed in the present application includes an AC power interface, a radio frequency signal input interface, a first group of output interfaces and a second group of output interfaces, a switching power supply, a switch control unit, a relay connection circuit and a signal connection circuit board. The switching power supply is used to convert the AC power inputted by the AC power interface into DC power to power the relay connection circuit, and the switch control unit is used to control the power supply of the relay connection circuit to output the radio frequency signal source inputted by the radio frequency signal input interface through the first and second output interfaces, so as to expand the number of radio frequency signal source output interfaces, so as to output the radio frequency signal source to the power amplifier and the power test probe, etc. respectively. 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 without manual switching, thereby improving the test efficiency under the premise of 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 AC power interface, a radio frequency signal input interface, a first group of output interfaces and a second group of output interfaces; the shielding shell is provided with a switching power supply, a switch control unit, a relay connection circuit and a signal connection circuit board; The AC power 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 switch control unit and is used to convert the alternating current into direct current, and use the direct current as the working power supply of the relay connection circuit through the switch control unit; The switch control unit is connected to the relay connection circuit and is used to control the working state of the relay connection circuit by switching 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 connection circuit board is respectively connected to the relay connection circuit, the first group of output interfaces and the second group of output interfaces, and the signal connection circuit board is used to electrically connect the radio frequency signal input interface and the first group of output interfaces; and / or the signal connection circuit board is also used to electrically connect the first group of output interfaces and the second group of output interfaces; The first group of output interfaces and the second group of output interfaces are used to output the RF signal source; The RF signal input interface includes at least one input connection terminal, and the input connection terminal is connected to the signal connection circuit board through a communication RF cable; the first group of output interfaces includes at least two output connection terminals, and each of the output connection terminals is respectively connected to the signal connection circuit board through a communication RF cable; the second group of output interfaces includes at least two groups of expansion connection ports, each group of expansion connection ports includes at least two expansion output terminals, and each of the expansion output terminals in the second group of output interfaces is respectively connected to the signal connection circuit board through a communication RF cable; The switch control unit includes a first switch device, a second switch device and a third switch device; The relay connection circuit includes a first group of relays, a second group of relays and a third group of relays, wherein the first group of relays, the second group of relays and the third group of relays each include at least one relay, each of the relays includes a control connection terminal and a response connection terminal, and when the control connection terminal is connected to the direct current, the response connection terminals are electrically connected together; The first switch device is connected to the switch power supply, the second switch device, the third switch device and the first group of relays respectively. When the first switch device is turned on, the second switch device and the third switch device are electrically connected to the switch power supply. When the first switch device is turned on, the direct current is also output to the control connection end of the first group of relays to be electrically connected to the response connection end of the first group of relays; The second switch device is connected between the first switch device and the control connection terminal of the second group of relays, and when the first switch device is turned on and the second switch device is turned on, the switch control unit outputs the direct current to the control connection terminal of the second group of relays to electrically connect the response connection terminal of the second group of relays; The third switch device is connected between the first switch device and the control connection terminal of the third group of relays. When the first switch device is turned on and the third switch device is turned on, the switch control unit outputs the direct current to the control connection terminal of the third group of relays to electrically connect the response connection terminal of the third group of relays. The signal connection circuit board comprises at least three groups of relay connection terminals, at least one group of input-end connection terminals and at least two groups of output-end connection terminals, each group of the relay connection terminals is connected to a group of relays in the relay connection circuit, and each group of the input-end connection terminals is connected to the input connection terminals of the RF signal input interface through a communication RF cable; the two groups of the output-end connection terminals are respectively electrically connected to one output connection terminal of the first group of output interfaces through a communication RF cable; When the control connection end of the first group of relays is connected to the direct current, the signal connection circuit board outputs the RF signal source input by the input connection terminal of the RF signal input interface through each of the output connection terminals of the first group of output interfaces; When the control connection ends of the second group of relays and / or the third group of relays are connected to the direct current, the signal connection circuit board connects the output connection terminals of the first group of output interfaces with the extended output terminals of the second group of output interfaces to expand the number of interfaces for the RF channel switching control device to output the RF signal source.

2. The radio frequency channel switching control device according to claim 1, characterized in that: The first switch device is a key switch; and / or the second switch device and / or the third switch device is a push button switch.

3. The radio frequency channel switching control device according to claim 1, characterized in that: The AC 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.

4. 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.

5. The radio frequency channel switching control device according to claim 1, characterized in that: The first group of output interfaces and / or the second group of output interfaces 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.

6. 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 5.

7. The electromagnetic compatibility test system according to claim 6, characterized in that: It also includes a signal generator, which is connected to the radio frequency signal input interface of the radio frequency channel switching control device and is used to output the radio frequency signal source to the radio frequency channel switching control device.

8. The electromagnetic compatibility test system according to claim 7, characterized in that: It also includes at least one power amplifier, which is connected to the first group of output interfaces of the RF channel switching control device; the power amplifier is used to amplify the RF signal source output by the RF 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.

9. The electromagnetic compatibility test system according to claim 8, characterized in that: It comprises at least two power amplifiers with different amplification powers, each of which is respectively connected to one of the output connection terminals of the first group of output interfaces; each of which outputs radiation signals of different preset test frequency bands.

10. The electromagnetic compatibility test system according to claim 8, characterized in that: It also includes at least one power test probe, which is connected to the second group of output interfaces of the radio frequency channel switching control device and is used to monitor the forward power and / or reverse power of the power amplifier.

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