CN211123074U - Electromagnetic compatibility testing device and equipment - Google Patents
Electromagnetic compatibility testing device and equipment Download PDFInfo
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- CN211123074U CN211123074U CN201921562094.6U CN201921562094U CN211123074U CN 211123074 U CN211123074 U CN 211123074U CN 201921562094 U CN201921562094 U CN 201921562094U CN 211123074 U CN211123074 U CN 211123074U
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Abstract
The utility model relates to an electromagnetic compatibility testing arrangement and equipment, power conversion circuit convert external power source's power supply into the target power supply that is fit for active antenna work demand. The radio frequency signal of the active antenna is coupled with the target power supply through the biaser, so that the active antenna can obtain stable power supply to carry out test operation. Meanwhile, when the voltage of the target power supply is greater than the preset voltage or the current is greater than the preset current, the overvoltage and overcurrent protection circuit disconnects a channel between the input end of the overvoltage and overcurrent protection circuit and the output end of the overvoltage and overcurrent protection circuit, and the active antenna or a receiver and other later-stage related test equipment are prevented from being damaged by the overlarge target power supply.
Description
Technical Field
The utility model relates to an electromagnetic compatibility test field especially relates to an electromagnetic compatibility testing arrangement and equipment.
Background
The vehicle as an integrated system needs many aspects in operation, including the cooperation of mechanical and electronic devices. With the increasing development of information technology, electronic devices mounted on vehicles are more and more abundant. In the operation of the vehicle, the electromagnetic compatibility among various electronic devices on the vehicle is important for the normal operation of the vehicle. Therefore, the electromagnetic compatibility of the vehicle is required to be tested in various national technical standards or international technical standards.
The vehicle-mounted antenna system of the vehicle is used as a key of the vehicle-mounted electronic equipment, and an electromagnetic compatibility test aiming at the vehicle-mounted antenna system is a very important item in the vehicle electromagnetic compatibility test. When a vehicle electromagnetic compatibility test is performed, a vehicle-mounted antenna is generally used as a test antenna. Vehicle antennas are typically active antennas that typically use a vehicle power supply during operation. However, it is difficult for an external power supply such as a vehicle-mounted power supply to maintain stable power supply, and active antenna noise is easily caused, thereby damaging an active antenna and a subsequent stage of related test equipment.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide an electromagnetic compatibility testing apparatus and device for overcoming the defects that it is difficult for an external power supply to maintain stable power supply, active antenna noise is easily caused, and an active antenna and a subsequent stage of related testing device are damaged.
An electromagnetic compatibility testing apparatus comprising:
one or more power modules; the power supply module comprises a power supply conversion circuit and an overvoltage and overcurrent protection circuit; the input end of the power supply conversion circuit is used for connecting an external power supply, the power supply conversion circuit is used for converting the power supply of the external power supply into target power supply, and the output end of the power supply conversion circuit is used for outputting the target power supply; the input end of the overvoltage and overcurrent protection circuit is connected with the output end of the power supply conversion circuit; the overvoltage and overcurrent protection circuit is also used for disconnecting a path between the input end of the overvoltage and overcurrent protection circuit and the output end of the overvoltage and overcurrent protection circuit when the voltage of the target power supply is greater than the preset voltage or the current is greater than the preset current;
a bias device; the input end of the biaser is used for accessing an active antenna, the output end of the biaser is used for connecting a receiver, and the coupling interface of the biaser is connected with the output end of the overvoltage and overcurrent protection circuit; the bias device is used for coupling the target power supply with the radio frequency signal of the active antenna so as to enable the target power supply to supply power for the active antenna; the biaser is also operable to output the radio frequency signal to a receiver.
According to the electromagnetic compatibility testing device, the power supply conversion circuit converts the power supply of an external power supply into the target power supply suitable for the working requirement of the active antenna. The radio frequency signal of the active antenna is coupled with the target power supply through the biaser, so that the active antenna can obtain stable power supply to carry out test operation. Meanwhile, when the voltage of the target power supply is greater than the preset voltage or the current is greater than the preset current, the overvoltage and overcurrent protection circuit disconnects a channel between the input end of the overvoltage and overcurrent protection circuit and the output end of the overvoltage and overcurrent protection circuit, and the active antenna or a receiver and other later-stage related test equipment are prevented from being damaged by the overlarge target power supply.
In one embodiment, the power module further comprises:
and the input end of the power supply conversion circuit is connected with an external power supply through the first filtering module.
In one embodiment, the power module further comprises:
and the output end of the overvoltage and overcurrent protection circuit is connected with the coupling interface of the biaser through the second filtering module.
In one embodiment, the power module further comprises:
and the switch module is used for controlling the on-off of a loop between the external power supply and the coupling interface of the bias device.
In one embodiment, the device further comprises a fuse;
the input end of the power conversion circuit is used for being connected with an external power supply through the fuse.
In one embodiment, the method further comprises the following steps:
a prompt module; the prompting module is connected in series with a loop between the external power supply and the coupling interface of the bias device.
In one embodiment, the first filtering module comprises a first low pass filter.
In one embodiment, the second filtering module comprises a second low pass filter.
In one embodiment, the power conversion circuit includes a linear voltage regulator circuit.
An electromagnetic compatibility testing apparatus comprising an apparatus housing and an electromagnetic compatibility testing device as in any one of the embodiments above disposed within the apparatus housing.
According to the electromagnetic compatibility testing equipment, the power supply conversion circuit converts the power supply of the external power supply into the target power supply suitable for the working requirement of the active antenna. The radio frequency signal of the active antenna is coupled with the target power supply through the biaser, so that the active antenna can obtain stable power supply to carry out test operation. Meanwhile, when the voltage of the target power supply is greater than the preset voltage or the current is greater than the preset current, the overvoltage and overcurrent protection circuit disconnects a channel between the input end of the overvoltage and overcurrent protection circuit and the output end of the overvoltage and overcurrent protection circuit, and the active antenna or a receiver and other later-stage related test equipment are prevented from being damaged by the overlarge target power supply.
Drawings
FIG. 1 is a block diagram of an embodiment of an apparatus for testing electromagnetic compatibility;
FIG. 2 is a diagram of a linear voltage regulator circuit;
FIG. 3 is a diagram of another linear voltage regulator circuit;
FIG. 4 is a block diagram of an electromagnetic compatibility testing apparatus according to another embodiment;
FIG. 5 is a circuit diagram of a first low pass filter;
FIG. 6 is a second low pass filter circuit diagram;
FIG. 7 is a schematic structural diagram of an embodiment of an apparatus for testing electromagnetic compatibility.
Detailed Description
For better understanding of the objects, technical solutions and technical effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be noted that the following examples are only for explaining the present invention and are not intended to limit the present invention.
The embodiment of the utility model provides an electromagnetic compatibility testing arrangement.
Fig. 1 is a block diagram of an electromagnetic compatibility testing apparatus according to an embodiment, and as shown in fig. 1, the electromagnetic compatibility testing apparatus according to an embodiment includes:
one or more power modules 100; the power module 100 comprises a power conversion circuit 101 and an overvoltage and overcurrent protection circuit 102; the input end of the power conversion circuit 101 is used for connecting an external power supply, the power conversion circuit 101 is used for converting the power supply of the external power supply into target power supply, and the output end of the power conversion circuit 101 is used for outputting the target power supply; the input end of the overvoltage and overcurrent protection circuit 102 is connected with the output end of the power supply conversion circuit 101; the overvoltage/overcurrent protection circuit 102 is further configured to disconnect a path between the input terminal of the overvoltage/overcurrent protection circuit 102 and the output terminal of the overvoltage/overcurrent protection circuit 102 when the voltage of the target power supply is greater than a preset voltage or the current is greater than a preset current;
the input terminal of the power conversion circuit 101 is connected to an external power source, such as a 12V power source or a 5V power source mounted on a vehicle. The input terminal of the power conversion circuit 101 receives power supplied from an external power source and converts the external power source into a target power supply. The power conversion process of the power conversion circuit 101 to the external power source includes changing the voltage or current of the external power source. In one embodiment, the power conversion circuit 101 includes a switching power circuit or a linear voltage regulator circuit.
In one embodiment, the apparatus for testing electromagnetic compatibility of an embodiment includes a plurality of power modules 100 to accommodate different external power sources. As one of the preferred embodiments, the electromagnetic compatibility testing apparatus of an embodiment includes two power modules 100 and two corresponding power conversion circuits 101, one power conversion circuit 101 is configured to convert a 12V dc power into a 5V dc power, and the other power conversion circuit 101 is configured to convert a 5V dc power into a 3.3V dc power. The antenna can be adapted to drive different active antennas while being adapted to different types of external power supplies.
In one embodiment, the power conversion circuit 101 is a linear voltage regulator circuit, fig. 2 is a linear voltage regulator circuit diagram, as shown in fig. 2, the linear voltage regulator circuit includes three-segment voltage regulator devices L M7805, 12V dc power supply for connecting an external power supply between an input terminal Vin of L M7805 and a ground terminal GND, an input terminal Vin of L M7805 is connected to the ground terminal GND sequentially through positive and negative electrodes of a first polarity capacitor C1, an input terminal Vin of &tttl/ttt/gttt M7805 is connected to the ground terminal GND sequentially through a first capacitor C2, an output terminal of &l "&tttl/t &/g M7805 is connected to the ground terminal GND sequentially through positive and negative electrodes of a second polarity capacitor C3, and an output terminal of &ttttttttransition &/t 7805 is connected to the ground terminal GND sequentially through positive and negative electrodes of a second polarity capacitor C3, and a positive and negative electrodes of a ground terminal of a second polarity capacitor C595 Vout is connected to the ground terminal GND for outputting the target ground terminal Vout.
IN one embodiment, fig. 3 is another linear voltage stabilizing circuit diagram, as shown IN fig. 3, the 3 linear voltage stabilizing circuit includes three segments of voltage stabilizing devices L M1117-3V3, an input terminal IN of L M1117-3V3 is used for receiving 5V dc power supply of an external power supply, the input terminal IN of L M1117-3V3 is connected to a ground terminal GND sequentially through a positive electrode and a negative electrode of a capacitor C5, an input terminal IN of the document No. L "&tttl L &/t &g M1117-3V3 is connected to the ground terminal GND sequentially through a third capacitor C6, the document No. t transition = L" &g L &l/t &g M1117-3V3 is connected to the ground terminal GND sequentially through a positive electrode and a negative electrode of a document No. t transition &l 7, and the document No. t transition &g/t 3V 1117 is connected to an output terminal of the document No. t 2V 1113V 685 t 3V 1113V 685 for outputting a target voltage supply through a positive electrode and a positive electrode of the document no.
The input end of the over-voltage and over-current protection circuit 102 is connected to the output end of the power conversion circuit 101, and is used for accessing a target power supply and outputting the target power supply to the coupling interface of the bias device 103. The overvoltage/overcurrent protection circuit 102 is further configured to detect a voltage or a current of the target power supply, and when the voltage or the current of the target power supply is greater than a preset voltage or greater than a preset current, disconnect a path between an input terminal of the overvoltage/overcurrent protection circuit 102 and an output terminal of the overvoltage/overcurrent protection circuit 102, so as to prevent an excessively large target power supply from being transmitted to a coupling interface of the biaser 103.
In one embodiment, the overvoltage/overcurrent protection circuit 102 is an overvoltage/overcurrent protection circuit 102 based on an NE555 time-base chip.
A bias device 103; the input end of the biaser 103 is used for accessing an active antenna, the output end of the biaser 103 is used for connecting a receiver, and the coupling interface of the biaser 103 is connected with the output end of the overvoltage and overcurrent protection circuit 102; the biaser 103 is configured to couple the target supply with the rf signal of the active antenna, such that the target supply powers the active antenna; the biaser 103 is also operable to output the radio frequency signal to a receiver.
Wherein the coupling interface of the biaser 103 receives the target supply, and the biaser 103 couples the target supply into the rf signal of the active antenna, so that the active antenna gets the supply. The biaser 103 also outputs the radio frequency signal received at its input to the receiver through its output to complete the emc test.
In one embodiment, the biaser 103 is a T-biaser 103.
In one embodiment, fig. 4 is a block diagram of an electromagnetic compatibility testing apparatus according to another embodiment, and as shown in fig. 4, the power module 100 further includes:
the input end of the power conversion circuit 101 is connected to an external power source through the first filtering module 200.
The first filtering module 200 is connected to the power supply of the external power supply before the power conversion circuit 101, and effectively filters a frequency point of a specific frequency in the external power supply or frequencies outside the frequency point to obtain a stable external power supply, and outputs the stable external power supply to the input end of the power conversion circuit 101.
In one embodiment, the first filtering module 200 selects a first low-pass filter. As a preferred embodiment, the first filtering module 200 uses a second-order low-pass filter.
In one embodiment, fig. 5 is a circuit diagram of a first low-pass filter, and as shown in fig. 5, the first low-pass filter is a common second-order low-pass filter, and includes a first amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth capacitor C9, and a sixth capacitor C10; the non-inverting input end of the first amplifier U1 is connected with power supplied by an external power supply through a second resistor R2 and a first resistor R1 in sequence, the non-inverting input end of the first amplifier U1 is connected with the output end of a first amplifier U1 through a second resistor R2 and a fifth capacitor C9 in sequence, the output end of the first amplifier U1 is connected with the input end of the power conversion circuit 101, the non-inverting input end of the first amplifier U1 is grounded through a sixth capacitor C10, the output end of the first amplifier U1 is grounded through a third resistor R3 and a fourth resistor R4 in sequence, and the inverting input end of the first amplifier U1 is connected with the common end of the third resistor R3 and the fourth resistor R4.
In one embodiment, as shown in fig. 4, the power module 100 further includes:
and the output end of the over-voltage and over-current protection circuit 102 is used for connecting the coupling interface of the biaser 103 through the second filtering module 201.
The second filtering module 201 is connected to the target power supply, and effectively filters a frequency point of a specific frequency in the target power supply or frequencies outside the frequency point to obtain a stable target power supply, and outputs the stable target power supply to the coupling interface of the bias device 103.
In one embodiment, the second filtering module 201 selects a second low-pass filter. As a preferred embodiment, the second filtering module 201 is an enhanced second-order low-pass filter.
In one embodiment, fig. 6 is a circuit diagram of a second low pass filter, and as shown in fig. 6, the second low pass filter includes a second amplifier U2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a seventh capacitor C11, and an eighth capacitor C12. The non-inverting input end of the second amplifier U2 is connected to a target power supply through a sixth resistor R6 and a fifth resistor R5 in sequence. The non-inverting input end of the second amplifier U2 is connected with the output end of the second amplifier U2 sequentially through a sixth resistor R6 and a seventh capacitor C11, the output end of the second amplifier U2 is connected with the coupling interface of the bias device 103, and the output end of the second amplifier U2 is grounded sequentially through a seventh resistor R7 and an eighth resistor R8. The non-inverting input of the second amplifier U2 is connected to ground and the inverting input of the second amplifier U2 is connected to ground. The eighth capacitor C12 is connected in parallel to the non-inverting input of the second amplifier U2.
In one embodiment, as shown in fig. 4, the power module 100 further includes:
and the switch module 202, wherein the switch module 202 is used for controlling the on-off of a loop between the external power supply and the coupling interface of the biaser 103.
Here, for convenience of explanation, the switch module 202 in fig. 4 is connected between an external power source and the power conversion module, and does not represent a limitation on the switch module 202. The switch module 202 is connected in series at any position of the loop between the external power supply and the coupling interface of the bias device 103 under the condition that the on-off of the loop between the external power supply and the coupling interface of the bias device 103 is controlled. When the switch module 202 is turned on, a loop between the external power supply and the coupling interface of the bias device 103 is turned on; when the switch module 202 is turned off, the loop between the external power supply and the coupling interface of the bias device 103 is turned off.
In one embodiment, switch module 202202 includes a key switch or an electronic switch.
In one embodiment, as shown in fig. 4, the power module 100 further includes:
and the prompting module 203 is connected in series with a loop between the external power supply and the coupling interface of the biaser 103.
The prompting module is connected in series with a loop between the external power supply and the coupling interface of the biaser 103, and when the loop between the external power supply and the coupling interface of the biaser 103 is conducted, the prompting module obtains power supply work to prompt a relevant tester that the power supply module 100 is in a working state and can output target power supply.
In one embodiment, the prompt module includes L ED or a buzzer.
In one embodiment, as shown in FIG. 4, a fuse 204 is also included;
the input terminal of the power conversion circuit 101 is used for connecting an external power source through the fuse 204.
When the power supplied by the external power source is too large, the fuse 204 breaks a loop between the external power source and the coupling interface of the bias device 103, so as to protect the power module 100 and the bias device 103.
In the apparatus for testing electromagnetic compatibility according to any of the embodiments described above, the power conversion circuit 101 converts the power supplied by the external power source into the target power suitable for the working requirement of the active antenna. The bias device 103 couples the rf signal of the active antenna with the target power supply, so that the active antenna can obtain stable power supply for testing. Meanwhile, when the voltage of the target power supply is greater than the preset voltage or the current is greater than the preset current, the overvoltage/overcurrent protection circuit 102 disconnects the path between the input end of the overvoltage/overcurrent protection circuit 102 and the output end of the overvoltage/overcurrent protection circuit 102, so that the active antenna or a receiver and other later-stage related test equipment are prevented from being damaged by the excessive target power supply.
The embodiment of the utility model provides an electromagnetic compatibility test equipment is still provided.
Fig. 7 is a schematic structural diagram of an electromagnetic compatibility testing apparatus according to an embodiment, and as shown in fig. 7, the electromagnetic compatibility testing apparatus according to an embodiment includes an apparatus case 1000 and an electromagnetic compatibility testing device 1001 according to any of the above embodiments, which is disposed in the apparatus case 1000.
In one embodiment, as shown in fig. 7, the device further includes a radio frequency input interface 1002 disposed on the device housing 1000, one end of the radio frequency input interface 1002 is connected to the input end of the bias device 103, and the other end of the radio frequency input interface 1002 is used for connecting to an active antenna.
In one embodiment, as shown in fig. 7, the apparatus further includes an rf output interface 1003 disposed on the apparatus housing 1000, one end of the rf output interface 1003 is connected to the output terminal of the bias unit 103, and the other end of the rf output interface 1003 is used to connect to a receiver.
In one embodiment, as shown in fig. 7, the device further includes a power interface 1004 disposed on the device housing 1000, one end of the power interface 1004 is connected to the input terminal of the power conversion circuit 101, and the other end of the power interface 1004 is used for connecting an external power source.
In the apparatus for testing electromagnetic compatibility according to any of the embodiments described above, the power conversion circuit 101 converts the power supplied from the external power source into the target power suitable for the operation requirement of the active antenna. The bias device 103 couples the rf signal of the active antenna with the target power supply, so that the active antenna can obtain stable power supply for testing. Meanwhile, when the voltage of the target power supply is greater than the preset voltage or the current is greater than the preset current, the overvoltage/overcurrent protection circuit 102 disconnects the path between the input end of the overvoltage/overcurrent protection circuit 102 and the output end of the overvoltage/overcurrent protection circuit 102, so that the active antenna or a receiver and other later-stage related test equipment are prevented from being damaged by the excessive target power supply.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An electromagnetic compatibility testing apparatus, comprising:
one or more power modules; the power supply module comprises a power supply conversion circuit and an overvoltage and overcurrent protection circuit; the input end of the power supply conversion circuit is used for connecting an external power supply, the power supply conversion circuit is used for converting the power supply of the external power supply into target power supply, and the output end of the power supply conversion circuit is used for outputting the target power supply; the input end of the overvoltage and overcurrent protection circuit is connected with the output end of the power supply conversion circuit; the overvoltage and overcurrent protection circuit is also used for disconnecting a path between the input end of the overvoltage and overcurrent protection circuit and the output end of the overvoltage and overcurrent protection circuit when the voltage of the target power supply is greater than a preset voltage or the current is greater than a preset current;
a bias device; the input end of the bias device is used for being connected with an active antenna, the output end of the bias device is used for being connected with a receiver, and the coupling interface of the bias device is connected with the output end of the overvoltage and overcurrent protection circuit; the bias device is used for coupling the target power supply with a radio frequency signal of the active antenna so that the target power supply supplies power to the active antenna; the biaser is further configured to output the radio frequency signal to the receiver.
2. The apparatus according to claim 1, wherein the power module further comprises:
and the input end of the power supply conversion circuit is connected with an external power supply through the first filtering module.
3. The apparatus according to claim 1, wherein the power module further comprises:
and the output end of the overvoltage and overcurrent protection circuit is connected with the coupling interface of the biaser through the second filtering module.
4. The apparatus according to claim 1, wherein the power module further comprises:
and the switch module is used for controlling the on-off of a loop between the external power supply and the coupling interface of the biaser.
5. The apparatus for testing electromagnetic compatibility according to claim 1, further comprising a fuse;
the input end of the power conversion circuit is used for being connected with an external power supply through the fuse.
6. The apparatus for testing electromagnetic compatibility according to claim 1, further comprising:
and the prompting module is connected in series with a loop between the external power supply and the coupling interface of the bias device.
7. The apparatus of claim 2, wherein the first filtering module comprises a first low pass filter.
8. The apparatus according to claim 3, wherein the second filtering module comprises a second low pass filter.
9. The apparatus according to any one of claims 1 to 8, wherein the power conversion circuit comprises a linear voltage regulator circuit.
10. An electromagnetic compatibility testing apparatus comprising an apparatus housing and an electromagnetic compatibility testing device according to any one of claims 1 to 9 provided in the apparatus housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921562094.6U CN211123074U (en) | 2019-09-19 | 2019-09-19 | Electromagnetic compatibility testing device and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921562094.6U CN211123074U (en) | 2019-09-19 | 2019-09-19 | Electromagnetic compatibility testing device and equipment |
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| Publication Number | Publication Date |
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| CN211123074U true CN211123074U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921562094.6U Active CN211123074U (en) | 2019-09-19 | 2019-09-19 | Electromagnetic compatibility testing device and equipment |
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| Country | Link |
|---|---|
| CN (1) | CN211123074U (en) |
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- 2019-09-19 CN CN201921562094.6U patent/CN211123074U/en active Active
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Effective date of registration: 20210108 Address after: Room 1402, basement and building T7, Nansha Jinmao Bay, No.01, jinmaozhong 2nd Street, Huangge Town, Nansha District, Guangzhou City, Guangdong Province Patentee after: Hengda hengchi new energy automobile technology (Guangdong) Co., Ltd Address before: 511458 room 1403, jinmaowan (T7 building) and basement, No.01, jinmaozhong 2nd Street, Huangge Town, Nansha District, Guangzhou City, Guangdong Province Patentee before: Evergrande new energy vehicle technology (Guangdong) Co.,Ltd. |
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Effective date of registration: 20220310 Address after: 300000-1, No. 200, Gaoxin 2nd Road, Binhai Science Park, high tech Zone, Binhai New Area, Tianjin Patentee after: Evergrande new energy vehicle (Tianjin) Co.,Ltd. Address before: Room 1402, basement and building T7, Nansha Jinmao Bay, No.01, jinmaozhong 2nd Street, Huangge Town, Nansha District, Guangzhou City, Guangdong Province Patentee before: Hengda hengchi new energy automobile technology (Guangdong) Co.,Ltd. |
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