CN207720120U - A kind of power supply adaptor - Google Patents
A kind of power supply adaptor Download PDFInfo
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- CN207720120U CN207720120U CN201820125304.4U CN201820125304U CN207720120U CN 207720120 U CN207720120 U CN 207720120U CN 201820125304 U CN201820125304 U CN 201820125304U CN 207720120 U CN207720120 U CN 207720120U
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Abstract
The utility model discloses a kind of power supply adaptor, is applied to electromagnetic compatibility vehicle radiation emission test, including power supply module, voltage transformation module and signal separation module；Power supply module is coupled to voltage transformation module, to provide a DC input voitage to voltage transformation module；Voltage transformation module includes multiple voltage conversion circuits, switching switch and output circuit, switching switch is operable one of to select in multiple voltage conversion circuits, is exported by output circuit so that DC input voitage is converted to corresponding DC output voltage by selected voltage conversion circuit；Signal separation module is coupled between voltage transformation module, active antenna and test receiver.The power supply adaptor of the utility model allows hand over different supply voltages in electromagnetic compatibility vehicle radiation emission test, can ensure that while ensureing the normal work of active antenna in test will not introduce electromagnetic interference, while realize the test request of power supply and signal extraction.
Description
Technical Field
The utility model relates to an electromagnetic compatibility test field, in particular to power adapter.
Background
The electromagnetic compatibility test of the vehicle-mounted products is one of necessary tests for measuring the electromagnetic compatibility of the vehicle-mounted products.
The test of the whole vehicle electromagnetic compatibility experiment at intermediate frequency, very high frequency and L wave band depends on the vehicle-mounted antenna, along with the continuous development of the vehicle-mounted antenna technology, the rod antenna at first is developed to the window antenna, the passive antenna at first is developed to the active antenna, the GPRS antenna is developed to the GPS antenna, and the technology thereof is developed from 2G to 3G and then to 4G along with the development of the communication technology. In which, the power supply voltage of the active antenna is also changed along with the development of the automobile platform technology. The electromagnetic compatibility testing technology also changes along with the change of the antenna: in the era of passive antennas, testing was relatively simple, with the passive receive antenna connected directly to the test receiver. In the active antenna power supply era, a vehicle-mounted battery supplies power to an antenna, a signal separator is added during testing to separate an alternating current signal in the active antenna and supply the alternating current signal to a radio frequency signal testing receiver, and fig. 1 is a wiring schematic diagram of a traditional electromagnetic compatibility whole vehicle radiation emission test.
The vehicle-mounted platform changes, the power supply of the active antenna correspondingly changes, wherein the power supply of 12V, the power supply of 8.5V and the power supply of 5V are provided, so that the power supply of different voltage grades can not be realized by simply using a vehicle-mounted battery, therefore, in the radiation emission test of the entire electromagnetic compatibility vehicle, storage batteries with different power supply voltage grades need to be prepared, the storage batteries are switched back and forth according to different antenna power supply requirements, and meanwhile, an independent signal separator is needed to separate alternating current signals in the active antenna and provide the alternating current signals for a radio frequency signal test receiver, so that the test is troublesome, and the problems of complex connecting line, poor reliability and easy introduction of electromagnetic interference exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the above problems, and provides a power adapter, which is applied to electromagnetic compatibility whole vehicle radiation emission test, can switch different power supply voltages to ensure the normal work of an active antenna in the test, and can ensure that the test result is not influenced by the introduction of electromagnetic interference in the test; in addition, the power adapter can separate direct current power supply and radio frequency signals, so that the test requirements of power supply and signal extraction are met while the medium-frequency, very-high-frequency and L-band radiation emission tests of vehicle-mounted parts are carried out.
In order to achieve the above object, the utility model provides a power adapter, which is applied to the radiation emission test of an entire vehicle with electromagnetic compatibility, and comprises a power supply module, a voltage conversion module and a signal separation module; wherein,
the power supply module is coupled to the voltage conversion module and used for providing a direct current input voltage for the voltage conversion module;
the voltage conversion module includes:
a plurality of voltage conversion circuits for converting the dc input voltage into a plurality of different dc output voltages;
a switch operable to select one of the plurality of voltage conversion circuits to cause the selected voltage conversion circuit to convert the DC input voltage to a corresponding DC output voltage;
an output circuit for outputting the corresponding DC output voltage;
the signal separation module is coupled among the voltage conversion module, the active antenna and the test receiver, and is used for supplying the direct current output voltage output by the output circuit to the active antenna and transmitting the radio frequency signal received by the active antenna to the test receiver.
Further, the power supply module comprises a battery, a power supply access end and a switching circuit;
the battery and the power supply access end are both connected with the voltage conversion module through the switching circuit;
the switching circuit is used for switching and selecting one of the power supply access end and the battery to be connected with the voltage conversion module according to whether the power supply access end is connected with an external power supply or not so as to provide the direct current input voltage for the voltage conversion module.
Further, the switching circuit includes a transistor M1, a transistor M2, a transistor M3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a diode D1, wherein:
the transistor M1 is coupled between the battery and the voltage conversion module, the transistor M3 is coupled between the control terminal of the transistor M1 and a common ground, and the transistor M2 is coupled between the resistor R1 and the common ground;
the power input terminal is coupled to the voltage conversion module through the diode D1, the battery is coupled to the control terminal of the transistor M3 through the resistor R1 and the resistor R3, the power input terminal is further coupled to the control terminal of the transistor M2 through the resistor R2, the resistor R4 is coupled between the control terminal of the transistor M3 and the common ground, and the resistor R5 is coupled between the battery and the control terminal of the transistor M1.
Further, the plurality of voltage conversion circuits are coupled between the switch and the output circuit; or
The switch is coupled between the voltage conversion circuits and the output circuit.
Further, the change-over switch is a single-pole multi-throw switch.
Preferably, the dc input voltage is 12V, and the dc output voltage is 12V or 8.5V or 5V.
Furthermore, the output circuit also comprises a filter circuit formed by a filter inductor and a filter capacitor.
Preferably, the filter circuit is a butterworth low-pass filter circuit.
Further, the output circuit further comprises a monitoring circuit, and the monitoring circuit is provided with a voltmeter and/or an ammeter.
Further, the signal separation module comprises an inductor, an isolation capacitor, a radio frequency input end and a radio frequency output end;
the radio frequency input end of the radio frequency input end is used for connecting the active antenna, and the radio frequency output end is used for connecting the test receiver;
the isolation capacitor is connected in series between the radio frequency input end and the radio frequency output end, the inductor is connected in series between the output end of the output circuit and the radio frequency output end, and the isolation capacitor is connected with the inductor.
The embodiment of the utility model provides a power adapter is applied to electromagnetic compatibility whole car radiation emission test, because this power adapter is equipped with voltage conversion module, consequently can realize switching different supply voltage for guarantee the normal work of real car active antenna, can ensure simultaneously that test system can not introduce electromagnetic interference and influence the test result; in addition, the power adapter is provided with a signal separation module, the signal separation module is coupled among the voltage conversion module, the active antenna and the test receiver and used for supplying power to the active antenna by the direct current output voltage output by the output circuit and transmitting the radio frequency signal received by the active antenna to the test receiver, so that the power adapter can separate the direct current power supply from the radio frequency signal to realize the test requirements of power supply and signal extraction while carrying out medium-frequency, very-high-frequency and L-band radiation emission tests on the vehicle-mounted parts; in addition, compared with the electromagnetic compatibility whole vehicle radiation emission test connection mode in the prior art, the connection mode between the power adapter and the active antenna and between the power adapter and the test receiver is simpler, and the insertion loss caused by cable connection can be directly reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic wiring diagram of a conventional EMC vehicle radiation emission test;
fig. 2 is a schematic wiring diagram of an electromagnetic compatibility complete vehicle radiation emission test provided by the embodiment of the present invention;
fig. 3 is a general schematic diagram of a power adapter according to an embodiment of the present invention;
fig. 4 is a specific circuit diagram of a power supply module according to an embodiment of the present invention;
fig. 5 is a specific circuit diagram of a voltage conversion module according to an embodiment of the present invention;
fig. 6 is a specific circuit diagram of a signal separation module according to an embodiment of the present invention;
fig. 7a to 7c are schematic diagrams illustrating the insertion loss test results of the power adapter of the present invention in the ranges of the intermediate frequency, the very high frequency and the L-band frequency band, respectively;
fig. 8a to 8c are schematic diagrams of the test results of the whole vehicle radiation emission spectrum of the power adapter in the intermediate frequency, the very high frequency and the L band, respectively.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a power adapter, this power adapter is applied to the whole car radiation emission test of electromagnetic compatibility, can switch over different supply voltage for guarantee the normal work of active antenna in the test, can guarantee simultaneously that can not introduce electromagnetic interference and influence the test result in the test; in addition, the power adapter can separate direct current power supply and radio frequency signals, so that the test requirements of power supply and signal extraction are met while the medium-frequency, very-high-frequency and L-band radiation emission tests of vehicle-mounted parts are carried out.
Referring to fig. 2, fig. 2 is a schematic diagram of a connection of an electromagnetic compatibility complete vehicle radiation emission test provided by an embodiment of the present invention, and the power adapter of the present invention is used in the test connection to perform the electromagnetic compatibility complete vehicle radiation emission test on a vehicle machine in a semi-anechoic chamber, which aims to shield external electromagnetic interference and ensure the stability and consistency of internal electric waves; as shown in fig. 2, the power adapter 1 is coupled between the active antenna 2 and the test receiver 3, and the power adapter 1 is connected to the body ground of the vehicle, and the radio frequency signal received by the active antenna 2 is transmitted to the test receiver 3 through the power adapter 1 and is subjected to test analysis by the test computer 4 connected to the test receiver 3.
Referring to fig. 3, fig. 3 is a general schematic diagram of a power adapter 1 according to an embodiment of the present invention, the power adapter 1 is coupled between an active antenna 2 and a test receiver 3, wherein the power adapter 1 includes a power supply module 10, a voltage conversion module 20, and a signal separation module 30.
Specifically, the power supply module 10 is coupled to the voltage conversion module 20 for providing a dc input voltage to the voltage conversion module 20, in the embodiment of the present invention, the dc input voltage is 12V, wherein a power input terminal for connecting the external vehicle-mounted power supply 5 can be set as the power supply module 10, and the external vehicle-mounted power supply provides the dc input voltage to the voltage conversion module 20; also can set up a vehicle-mounted battery inside power adapter, regard this vehicle-mounted battery as power supply module 10 to provide direct current input voltage for voltage conversion module 20, the embodiment of the utility model provides a do not restrict specific power supply module.
Wherein, the voltage conversion module 20 includes a plurality of voltage conversion circuits 21, a switch 22 and an output circuit 23, wherein: the plurality of voltage conversion circuits 21 are configured to convert a dc input voltage provided by the power supply module 10 into a plurality of different dc output voltages; the changeover switch 22 is operable to select one of the plurality of voltage conversion circuits 21 to cause the selected voltage conversion circuit 21 to convert the direct-current input voltage into a corresponding direct-current output voltage; an output circuit 23 for outputting a corresponding dc output voltage; the switch 22 may be a single-pole multi-throw switch, the voltage conversion circuit 21 may be provided with a voltage converter, the 12V dc input voltage may be converted into 5V, 8.5V and 12V dc output voltages by the plurality of voltage conversion circuits 21, and the corresponding output voltages are switched by the switch 22 to meet the power supply requirements of different active antennas.
In the voltage conversion module 20, a plurality of voltage conversion circuits 21 may be coupled between a switch 22 and an output circuit 23, the switch 22 is coupled to the power supply module 10, so as to select one of the plurality of voltage conversion circuits 21 by operating the switch 22, and convert the dc input voltage provided by the power supply module 10 into a corresponding dc output voltage, and the specific connection relationship can be as shown in fig. 3. For example, the 12V dc input voltage provided by the power supply module 10 is converted into 5V by operating the switch 22. It is obvious to those skilled in the art that, in the voltage conversion module 20, the switch 22 may also be coupled between the plurality of voltage conversion circuits 21 and the output circuit 23, the plurality of voltage conversion circuits 21 are coupled to the power supply module 10, the plurality of voltage conversion circuits 21 convert the dc input voltage provided by the power supply module 10 into a plurality of different output voltages, and then the switch 22 is operated to select one of the plurality of output voltages, so as to output the selected output voltage through the output circuit 23.
The connection relationship between the plurality of voltage conversion circuits and the selector switch is not limited to the above arrangement, and other arrangements may be made in other embodiments. The utility model discloses do not do specifically and restrict to a plurality of voltage converting circuit and change over switch's relation of connection.
The signal separation module 30 is coupled between the voltage conversion module 20, the active antenna 2 and the test receiver 3, and configured to supply the dc output voltage output by the output circuit 23 to the active antenna 2, and transmit the radio frequency signal received by the active antenna 2 to the test receiver 3.
The embodiment of the utility model provides a power adapter is applied to the whole car radiation emission test of electromagnetic compatibility, because this power adapter is equipped with voltage conversion module, consequently can realize switching different supply voltage for guarantee the normal work of active antenna in the test, can ensure simultaneously that the test system can not introduce electromagnetic interference and influence the test result; in addition, the power adapter is provided with a signal separation module, the signal separation module is coupled among the voltage conversion module, the active antenna and the test receiver and used for supplying power to the active antenna by the direct current output voltage output by the output circuit and transmitting the radio frequency signal received by the active antenna to the test receiver, so that the power adapter can separate the direct current power supply from the radio frequency signal to realize the test requirements of power supply and signal extraction while carrying out medium-frequency, very-high-frequency and L-band radiation emission tests on the vehicle-mounted parts; in addition, compared with the electromagnetic compatibility whole vehicle radiation emission test connection mode in the prior art, the connection mode between the power adapter and the active antenna and between the power adapter and the test receiver is simpler, and the insertion loss caused by cable connection can be directly reduced.
As an embodiment of the present invention, a fuse (not shown) is further connected in series between the power supply module 10 and the voltage conversion module 20, and since the fuse blows due to an excessive current flowing through the fuse, the fuse can prevent the current in the circuit from being too large and damaging the key device.
As an embodiment of the present invention, referring to fig. 3, the power supply module 10 includes a battery 11, a power input end 12 and a switching circuit 13, the battery 11 and the power input end 12 are both connected to the voltage conversion module 20 through the switching circuit 13, wherein the power input end 12 is used for connecting an external power source 5; the switching circuit 13 is configured to select one of the power input end 12 and the battery 11 to be connected to the voltage conversion module 20 according to whether the power input end 12 is connected to the external power source 5, so as to provide a dc input voltage to the voltage conversion module 20, wherein the power input end 12 is disposed on a surface of the power adapter, and the battery 11 and the electrical switching circuit 13 are both disposed inside the power adapter.
As an embodiment of the present invention, the power adapter further has a charging terminal (not shown) connected to the battery 11 on the surface, wherein an anti-interference circuit composed of an inductor and a plurality of capacitors is connected between the charging terminal and the battery 11, so that when the battery 11 is charged, the external power supply can be ensured to charge the battery 11 smoothly, and the interference of the surge, the start pulse and other pulse waveforms (such as ISO7637 pulse) to the whole test system is eliminated.
As an embodiment of the present invention, the output circuit 23 further includes a filter circuit 231 composed of a filter capacitor and a filter inductor. Because the output voltage is accompanied by high ripple and interference, the interference of 100K-3GHz signals can be eliminated by arranging the filter circuit in the output circuit, the electromagnetic compatibility test result is prevented from being influenced, and the reliability of the electromagnetic compatibility whole vehicle radiation emission test is ensured.
The filter circuit 231 may be a butterworth low-pass filter circuit, and the butterworth low-pass filter circuit may adopt a fourth-order butterworth low-pass filter network. Since the attenuation curve of the Butterworth filter has no ripple and is called as a maximum smoothing filter, the reliability of the radiation emission test of the electromagnetic compatibility whole vehicle can be further ensured by setting the filter circuit as a Butterworth low-pass filter circuit.
As an embodiment of the present invention, the output circuit 23 further includes a monitoring circuit 232, the monitoring circuit 232 is provided with a voltmeter and/or an ammeter, wherein, the voltmeter and/or the ammeter are disposed on the surface of the power adapter 1, thereby the output voltage and/or the current of the output circuit 23 can be measured by disposing the voltmeter and/or the ammeter, the supply voltage provided to the active antenna is monitored at any time, and whether the antenna works and the test system is normal can be visually seen.
To further explain the power adapter provided in the embodiment of the present invention, the power adapter switches and outputs a 12V/8.5V/5V power supply voltage as an example.
Fig. 4 is the embodiment of the utility model provides a power supply module's concrete circuit diagram, wherein power supply module 10 includes Battery 11, power incoming end 12 and switching circuit 13, power supply module 10 provides direct current input voltage signal Vi to voltage conversion module 20, this direct current input voltage signal Vi's magnitude of voltage is 12V, refer to fig. 4 and show, power incoming end 12 is used for inserting external power Vehicel Battery (external vehicle mounted power puts in order to put kl.30, also is the power of vehicle itself), switching circuit 13 is coupled between Battery 11 and power incoming end 12. The switching circuit 13 includes a transistor M1, a transistor M2, a transistor M3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a diode D1, wherein: the transistor M1 may be a P-type field effect transistor, the transistor M2 and the transistor M3 may be NPN-type triodes, the transistors M1, M2 and M3 respectively have a control terminal, the resistances of the resistor R1 and the resistor R4 are 10k ohms, the resistances of the resistor R2 and the resistor R3 are 3.3k ohms, and the resistance of the resistor R5 is 100k ohms. Specifically, the transistor M1 is coupled between the battery 11 and the voltage conversion module 20, the transistor M3 is coupled between the control terminal of the transistor M1 and the common ground, and the transistor M2 is coupled between the resistor R1 and the common ground; the power input terminal 12 is coupled to the voltage conversion module 20 through a diode D1, the battery 11 is coupled to the control terminal of the transistor M3 through a resistor R1 and a resistor R3, the power input terminal 12 is further coupled to the control terminal of the transistor M2 through a resistor R2, a resistor R4 is coupled between the control terminal of the transistor M3 and the common ground, and the resistor R5 is coupled between the battery 11 and the control terminal of the transistor M1, wherein the diode D1 has a lower forward conducting voltage. When the power input terminal 12 is connected to an external power source, the transistor M2 is turned on, the transistor M3 and the transistor M1 are both turned off, and at this time, the external power source outputs the dc input voltage signal Vi to the voltage conversion module 20, and when the power input terminal 12 is not connected to the external power source, the transistor M2 is turned off, the transistor M3 and the transistor M1 are both turned on, and at this time, the battery 11 outputs the dc input voltage signal Vi to the voltage conversion module 20. Therefore, the switching circuit 13 switches and selects the connection between one of the power input terminal 12 and the battery 11 and the voltage conversion module 20 according to whether the power input terminal is connected to the external power supply, so as to provide the direct-current input voltage Vi to the voltage conversion module 20.
Of course, as can be easily understood by those skilled in the art, the circuit structure of the above-mentioned switching circuit does not implement the unique selection of switching between the selective power source access terminal and the connection between one of the battery and the voltage conversion module according to whether the power source access terminal accesses the external power source, so as to provide the dc input voltage to the voltage conversion module, and in addition, the circuit structure can also be implemented by other circuit structure forms, for example, the relay is used as the switch to implement the connection between the selective power source access terminal and one of the battery and the voltage conversion module, and the embodiment of the present invention is not limited to the specific switching circuit.
Fig. 5 is a specific circuit diagram of a voltage conversion module provided by an embodiment of the present invention, the voltage conversion module converts a dc input voltage supplied by a power supply module into a plurality of different dc output voltages, and can switch and select the plurality of different dc output voltages to output corresponding dc output voltages, and correspondingly describes a power supply voltage of 5V/8.5V/12V which is switched and output by the voltage conversion module from a 12V dc input voltage provided by the power supply module, as shown in fig. 5, a 12V dc input voltage signal Vi output by the power supply module 10 is provided to the voltage conversion module 20 through a fuse F1, and outputs a corresponding dc output voltage Vo from the voltage conversion module 20, the voltage conversion module 20 includes a plurality of voltage conversion circuits 21, a switch 22 and an output circuit 23, wherein, the plurality of voltage conversion circuits 21 are coupled between the switch 22 and the output circuit 23, and the fuse F1 is connected to the moving end of the switch 22; the junction of the movable end of the switch 22 and the fuse F1 is connected to the anode of a light emitting diode LED1, the cathode of the light emitting diode LED1 is connected to the common ground through a resistor R6, wherein the light emitting diode LED1 indicates whether the power adapter is working normally. Of course, as those skilled in the art can easily understand, the circuit structure of the voltage converting circuits described above is not the only option for converting the dc input voltage supplied by the power supply module into a plurality of different dc output voltages, and the voltage converting circuits may be designed into other circuit structure forms.
With continued reference to fig. 5, the three fixed terminals of the switch 22 are respectively connected to the input terminals of the three voltage converting circuits 21, and the output terminals of the three voltage converting circuits 21 are connected to each other; for convenience of illustration, the three voltage converting circuits 21 are represented by a first voltage converting circuit, a second voltage converting circuit and a third voltage converting circuit, wherein the first voltage converting circuit is a conductive wire; the second voltage conversion circuit is used for converting a 12V direct-current input voltage into a 5V direct-current output voltage, the third voltage conversion circuit is used for converting the 12V direct-current input voltage into an 8.5V direct-current output voltage, the second voltage conversion circuit comprises a voltage converter U1, a capacitor C1 and a capacitor C2 which are connected in parallel, and a capacitor C3 and a capacitor C4 which are connected in parallel, wherein the voltage converter U1 is an LM7805 voltage converter, a connection point of one end of a capacitor C1 and one end of a capacitor C2 is connected with an input end of the voltage converter U1, a connection point of one end of a capacitor C3 and one end of a capacitor C4 is connected with an output end of the voltage converter U1, and grounding ends of the other ends of the capacitor C1, the capacitor C2, the capacitor C3, the other end of the capacitor C4 and the U1 are connected with; the third voltage converting circuit includes a voltage converter U2, a capacitor C5 and a capacitor C6 connected in parallel, and a capacitor C7 and a capacitor C8 connected in parallel, wherein the voltage converter U2 is an LM7808 voltage converter, and the connection structures of the third voltage converting circuit and the second voltage converting circuit are the same, and are not described herein again.
With continued reference to fig. 5, a filter circuit in the output circuit 23 is coupled to the output terminals of the three voltage converting circuits 21, and the filter circuit includes a capacitor C9, a capacitor C10, an inductor L1, and an inductor L2, wherein one end of the capacitor C9 is connected to one end of the inductor L1, the other end of the capacitor C9 is connected to the common ground, the other end of the inductor L1 is connected in series to a connection point between one end of the inductor L2 and one end of the capacitor C10, the other end of the capacitor C10 is connected to the common ground, the other end of the inductor L2 is connected to the voltage output terminal Vo, and the voltage output terminal Vo outputs a dc output voltage, wherein the capacitance values of the capacitor C9 and the capacitor C10 are both 100uF, the inductance value of the inductor L1 is 740uH, and the inductance value of the inductor L2 is 1.
With continued reference to fig. 5, the monitoring circuit in the output circuit 23 is provided with an ammeter a1 and a voltmeter V1, wherein the ammeter a1 is connected in series between the inductor L1 and the inductor L2, one end of the voltmeter V1 is connected to the ammeter a1, and the other end of the voltmeter V1 is connected to the common ground.
As an implementation manner of the present invention, referring to fig. 6, fig. 6 is a specific circuit diagram of a signal separation module according to an embodiment of the present invention, wherein the signal separation module 30 includes an inductor L3, an isolation capacitor C11, a radio frequency input terminal RF1 and a radio frequency output terminal RF2, the radio frequency input terminal RF1 and the radio frequency output terminal RF2 are both disposed on the surface of the power adapter, the radio frequency input terminal RF1 is used for connecting an active antenna, the radio frequency output terminal RF2 is used for connecting a test receiver, the isolation capacitor C11 is connected in series between the radio frequency input terminal RF1 and the radio frequency output terminal RF2, the inductor L3 is connected in series between the output terminal of the output circuit 23 and the radio frequency output terminal RF2 to receive the dc output voltage signal Vo output by the output circuit 23, and the isolation capacitor C11 is connected with the inductor L. Therefore, the power adapter can separate a direct-current power supply from a radio-frequency signal, so that the test requirements of power supply and signal extraction are met while the medium-frequency, very-high-frequency and L-band radiation emission tests of the vehicle-mounted parts are carried out.
The utility model discloses a power adapter can be equivalent to a two Port network, a termination input signal, another termination output signal to Port 1 is as the input Port of signal, and Port 2 is as the output Port of signal, S21Indicating the insertion loss, i.e. how much energy has been transferred to the destination (Por)t 2), the larger this value is the better, the ideal value is 1, namely 0dB, the insertion loss S21 test is carried out on the power adapter of the utility model in the ranges of the intermediate frequency, the very high frequency and the L wave band, the insertion loss test result is shown in fig. 7a to fig. 7c, fig. 7a to fig. 7c are respectively the schematic diagram of the insertion loss test result of the power adapter in the ranges of the intermediate frequency, the very high frequency and the L wave band, and it can be seen visually from fig. 7a and fig. 7b, the insertion loss of the power adapter of the utility model is smaller in the ranges of the intermediate frequency (520KHz-1.73MHz) and the very high frequency (76MHz-108MHz), and the insertion loss is less than 0.7 dB; it can be seen from fig. 7c that in the L-band (1568MHz-1583MHz), the insertion loss is less than 2dB, and the insertion loss value can be corrected by EMC32 test software, so as to ensure that the experimental data is true and reliable.
Will the utility model discloses a power adapter inserts whole car electromagnetic compatibility radiation emission test system, carries out the spectrum test at intermediate frequency (520KHz-1.73MHz), very high frequency (76MHz-108MHz) and L band (1568MHz-1583MHz) frequency range, and the test result is shown as figure 8a ~ 8c, and figure 8a ~ 8c are respectively the utility model discloses a power adapter is at the whole car radiation emission spectrum test result schematic diagram of intermediate frequency, very high frequency and L band, and the background noise that records is less than the limit value 6dB, leaves sufficient test allowance, does not introduce broadband and narrowband interference, can be good be applied to in whole car radiation emission test.
Above-mentioned all optional technical scheme can adopt arbitrary combination to form the optional embodiment of this utility model, and the repeated description is no longer given here.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A power adapter is applied to electromagnetic compatibility whole vehicle radiation emission test and is characterized by comprising a power supply module, a voltage conversion module and a signal separation module; wherein,
the power supply module is coupled to the voltage conversion module and used for providing a direct current input voltage for the voltage conversion module;
the voltage conversion module includes:
a plurality of voltage conversion circuits for converting the dc input voltage into a plurality of different dc output voltages;
a switch operable to select one of the plurality of voltage conversion circuits to cause the selected voltage conversion circuit to convert the DC input voltage to a corresponding DC output voltage;
an output circuit for outputting the corresponding DC output voltage;
the signal separation module is coupled among the voltage conversion module, the active antenna and the test receiver, and is used for supplying the direct current output voltage output by the output circuit to the active antenna and transmitting the radio frequency signal received by the active antenna to the test receiver.
2. The power adapter as claimed in claim 1, wherein the power supply module comprises a battery, a power input terminal and a switching circuit;
the battery and the power supply access end are both connected with the voltage conversion module through the switching circuit;
the switching circuit is used for switching and selecting one of the power supply access end and the battery to be connected with the voltage conversion module according to whether the power supply access end is connected with an external power supply or not so as to provide the direct current input voltage for the voltage conversion module.
3. The power adapter as claimed in claim 2, wherein the switching circuit comprises a transistor M1, a transistor M2, a transistor M3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a diode D1, wherein:
the transistor M1 is coupled between the battery and the voltage conversion module, the transistor M3 is coupled between the control terminal of the transistor M1 and a common ground, and the transistor M2 is coupled between the resistor R1 and the common ground;
the power input terminal is coupled to the voltage conversion module through the diode D1, the battery is coupled to the control terminal of the transistor M3 through the resistor R1 and the resistor R3, the power input terminal is further coupled to the control terminal of the transistor M2 through the resistor R2, the resistor R4 is coupled between the control terminal of the transistor M3 and the common ground, and the resistor R5 is coupled between the battery and the control terminal of the transistor M1.
4. The power adapter as recited in claim 1,
the plurality of voltage conversion circuits are coupled between the selector switch and the output circuit; or
The switch is coupled between the voltage conversion circuits and the output circuit.
5. The power adapter as claimed in claim 1 or 4, wherein the switch is a single pole multiple throw switch.
6. The power adapter as claimed in claim 1, wherein the dc input voltage is 12V and the dc output voltage is 12V or 8.5V or 5V.
7. The power adapter as claimed in claim 1, wherein the output circuit further comprises a filter circuit comprising a filter inductor and a filter capacitor.
8. The power adapter as described in claim 7, wherein said filter circuit is a butterworth low pass filter circuit.
9. The power adapter as claimed in claim 1, wherein the output circuit further comprises a monitoring circuit provided with a voltmeter and/or an ammeter.
10. The power adapter as claimed in claim 1, wherein the signal splitting module comprises an inductor, an isolation capacitor, a radio frequency input and a radio frequency output;
the radio frequency input end is used for connecting the active antenna, and the radio frequency output end is used for connecting the test receiver;
the isolation capacitor is connected in series between the radio frequency input end and the radio frequency output end, the inductor is connected in series between the output end of the output circuit and the radio frequency output end, and the isolation capacitor is connected with the inductor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820125304.4U CN207720120U (en) | 2018-01-25 | 2018-01-25 | A kind of power supply adaptor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820125304.4U CN207720120U (en) | 2018-01-25 | 2018-01-25 | A kind of power supply adaptor |
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| Publication Number | Publication Date |
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| CN207720120U true CN207720120U (en) | 2018-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820125304.4U Active CN207720120U (en) | 2018-01-25 | 2018-01-25 | A kind of power supply adaptor |
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| Country | Link |
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| CN (1) | CN207720120U (en) |
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