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 is related to electromagnetic compatibility test field, more particularly to a kind of power supply adaptor.
Background technology
The application of a large amount of electrical equipments on automobile, such as motor, controller, high-frequency data communication equipment, these electric appliances are set
Many of standby conducting wire, coil and the electric appliance with contact, have different capacitance and inductance, any one is with inductance and electricity
The closed circuit of appearance can all form oscillation circuit, generate the higher-order of oscillation and be emitted in the air with electromagnetic wave, cause interior system
External radiation is increased with vehicle between system, it is therefore desirable to vehicle-mounted Electromagnetic Compatibility performance is weighed, and electromagnetic compatibility vehicle radiates
Transmitting test is to weigh one of necessary experiment of vehicle-mounted Electromagnetic Compatibility performance.
Vehicle electromagnetic compatibility is tested in intermediate frequency, and the test of very high frequency(VHF) and L-band relies on car antenna, with car antenna
The continuous development of technology, the mast antenna from originally develop to window antenna, from passive antenna originally to active antenna, from
GPRS antenna is to GPS antenna, and technology is with the development of communication technologies again to 4G from 2G to 3G.Wherein, active antenna is with vapour
Variation also occurs for its supply voltage of the development of vehicle platform technology.Electromagnetic Compatibity Test Technology also will be into also with the variation of antenna
The corresponding variation of row：In the epoch of passive antenna, test is relatively easy, and dumb antenna is connected directly to test receiver.Have
Source antenna is powered the epoch, is powered to antenna by on-vehicle battery, and needs increase demultiplexer in test, to detach active day
AC signal in line is supplied to radiofrequency signal test receiver, shown referring to Fig.1, and Fig. 1 is traditional electromagnetic compatibility vehicle spoke
Penetrate the wiring schematic diagram of transmitting test.
Change with vehicle platform, active antenna power supply is also corresponding and then to be changed, wherein there are 12V power supplies, 8.5V power supplies, 5V is supplied
Electricity just cannot achieve different voltages grade with on-vehicle battery merely in this way and be powered, therefore radiates and send out in electromagnetic compatibility vehicle
It penetrates in test, needs the accumulator for preparing different power voltage grade, toggled according to different antenna power reguirements, simultaneously
The AC signal for needing individual demultiplexer to detach in active antenna is supplied to radiofrequency signal test receiver, thus leads
Test and comparison trouble is caused, there are problems that line complexity, poor reliability, be readily incorporated electromagnetic interference.
Utility model content
The utility model aims to solve the problem that the above problem, provides a kind of power supply adaptor, which is applied to electromagnetism
Compatible vehicle radiation emission test, allows hand over different supply voltages, to ensure the normal work of active antenna in test,
It can ensure introduce electromagnetic interference in test and influence test result simultaneously；In addition, the power supply adaptor can carry out directly
The separation in galvanic electricity source and radiofrequency signal, to be realized while vehicle component intermediate frequency, very high frequency(VHF), L-band radiation emission test
The test request of power supply and signal extraction.
To achieve the above object, the utility model provides a kind of power supply adaptor, is applied to electromagnetic compatibility vehicle and radiates
Transmitting test, including power supply module, voltage transformation module and signal separation module；Wherein,
The power supply module is coupled to the voltage transformation module, to provide one to the voltage transformation module
DC input voitage；
The voltage transformation module includes：
Multiple voltage conversion circuits, the DC input voitage to be converted to multiple and different DC output voltage；
Switching switch, it is operable one of to select in the multiple voltage conversion circuit, so that selected electricity
The DC input voitage is converted to corresponding DC output voltage by voltage conversion circuit；
Output circuit, to export corresponding DC output voltage；
The signal separation module is coupled between the voltage transformation module, active antenna and test receiver, to
The DC output voltage that the output circuit exports is supplied electricity into the active antenna, and the radio frequency that the active antenna is received
Signal transmission is to the test receiver.
Further, the power supply module includes battery, power access end and switching circuit；
The battery and the power access end are connect by the switching circuit with the voltage transformation module；
Wherein, the switching circuit switches whether to access external power supply according to the power access end described in selection
One in power access end and the battery connect with the voltage transformation module, to provide institute to the voltage transformation module
State DC input voitage.
Further, the switching circuit includes transistor M1, transistor M2, transistor M3, resistance R1, resistance R2, electricity
R3, resistance R4, resistance R5 and diode D1 are hindered, wherein：
The transistor M1 is coupled between the battery and the voltage transformation module, and the transistor M3 is coupled to institute
State transistor M1 control terminal and publicly between, the transistor M2 be coupled to the resistance R1 and it is described publicly between；
The power access end is coupled to the voltage transformation module by the diode D1, and the battery passes through described
The resistance R1 and resistance R3 is coupled to the control terminal of the transistor M3, and the power access end also passes through the resistance R2 couplings
Be connected to the control terminal of the transistor M2, the resistance R4 be coupled to the control terminal of the transistor M3 with it is described publicly it
Between, the resistance R5 is coupled between the battery and the control terminal of the transistor M1.
Further, the multiple voltage conversion circuit is coupled between the switching switch and the output circuit；Or
Person
The switching switch is coupled between the multiple voltage conversion circuit and the output circuit.
Further, the switching switch is single pole multiple throw.
Preferably, the DC input voitage is 12V, and the DC output voltage is 12V or 8.5V or 5V.
Further, the output circuit further includes the filter circuit being made of filter inductance and filter capacitor.
Preferably, the filter circuit is Butterworth low pass wave circuit.
Further, the output circuit further includes monitoring circuit, and the monitoring circuit is equipped with voltmeter and/or electric current
Table.
Further, the signal separation module includes inductance, isolation capacitance, rf inputs and RF output end；
The rf inputs rf inputs are for connecting the active antenna, and the RF output end is for connecting institute
State test receiver；
The isolation capacitance is connected between the rf inputs and the RF output end, and the inductance is connected on institute
It states between the output end of output circuit and the RF output end, the isolation capacitance is connected with the inductance.
A kind of power supply adaptor that the utility model embodiment provides is applied to electromagnetic compatibility vehicle radiation emission test,
Since the power supply adaptor is equipped with voltage transformation module, it can realize and switch different supply voltages, to ensure real vehicle
The normal work of active antenna, while can ensure that test system will not introduce electromagnetic interference and influence test result；In addition, should
Power supply adaptor is equipped with signal separation module, and signal separation module is coupled to voltage transformation module, active antenna and test and receives
Between machine, the DC output voltage to export the output circuit supplies electricity to the active antenna, and active antenna is connect
The radio signal transmission of receipts is to test receiver, and thus the power supply adaptor can carry out DC power supply and point of radiofrequency signal
From to realize the test of power supply and signal extraction while vehicle component intermediate frequency, very high frequency(VHF), L-band radiation emission test
It is required that；In addition, compared with the electromagnetic compatibility vehicle radiation emission test connection type of the prior art, the power supply adaptor with it is active
Connection type between antenna and test receiver is simpler, can directly reduce the insertion loss brought by cable connection.
Description of the drawings
It is required in being described below to embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the wiring schematic diagram of traditional electromagnetic compatibility vehicle radiation emission test；
Fig. 2 is the wiring schematic diagram for the electromagnetic compatibility vehicle radiation emission test that the utility model embodiment provides；
Fig. 3 is a kind of power supply adaptor general principles figure that the utility model embodiment provides；
Fig. 4 is the physical circuit figure for being the power supply module that the utility model embodiment provides；
Fig. 5 is the physical circuit figure for the voltage transformation module that the utility model embodiment provides；
Fig. 6 is the physical circuit figure for the signal separation module that the utility model embodiment provides；
Fig. 7 a~Fig. 7 c are the power supply adaptor of the utility model respectively in intermediate frequency, very high frequency(VHF) and L-band band limits
Insertion loss test result schematic diagram；
Fig. 8 a~Fig. 8 c are that the power supply adaptor of the utility model is radiated in the vehicle of intermediate frequency, very high frequency(VHF) and L-band respectively
Emission spectrum test result schematic diagram.
Specific implementation mode
To keep the purpose of this utility model, technical solution and advantage clearer, implement below in conjunction with the utility model
Attached drawing in example, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described reality
It is only the utility model a part of the embodiment to apply example, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this reality
With novel protected range.
The utility model embodiment provides a kind of power supply adaptor, which is applied to electromagnetic compatibility vehicle spoke
Transmitting test is penetrated, different supply voltages is allowed hand over, to ensure the normal work of active antenna in test, while can be true
Electromagnetic interference will not be introduced and influence test result by protecting in test；In addition, the power supply adaptor can carry out DC power supply and penetrate
The separation of frequency signal, to realize power supply and signal while vehicle component intermediate frequency, very high frequency(VHF), L-band radiation emission test
The test request of extraction.
With reference to shown in Fig. 2, Fig. 2 is the wiring for the electromagnetic compatibility vehicle radiation emission test that the utility model embodiment provides
Schematic diagram carries out electromagnetic compatibility using the power supply adaptor of the utility model in test connection to the vehicle machine of semi-anechoic chamber
Vehicle radiation emission test, the purpose of semi-anechoic chamber are the electromagnetic interferences outside shielding, while also ensureing its internal electric wave
Stability and consistency；As shown in Fig. 2, between the coupling of power supply adaptor 1 and active antenna 2 and test receiver 3, and power supply is suitable
With being connected to the vehicle body of vehicle, the radiofrequency signal that active antenna 2 receives is transferred to test to orchestration 1 by the power supply adaptor 1
In receiver 3, and test analysis is carried out by the test computer 4 that test receiver 3 is connected.
With reference to shown in Fig. 3, Fig. 3 is a kind of power supply adaptor general principles figure that the utility model embodiment provides, the electricity
Source adapter 1 is coupled between active antenna 2 and test receiver 3, wherein the power supply adaptor 1 includes power supply module
10, voltage transformation module 20 and signal separation module 30.
Specifically, power supply module 10 is coupled to voltage transformation module 20, to provide one to voltage transformation module 20
DC input voitage, in the utility model embodiment, which is 12V, wherein can will be accessing outside
One power access end of vehicle power supply 5 is set as power supply module 10, is provided from external vehicle power supply to voltage transformation module 20
DC input voitage；One on-vehicle battery can also be set inside power supply adaptor, mould is supplied using the on-vehicle battery as power supply
Block 10, to provide DC input voitage to voltage transformation module 20, the utility model embodiment is to specific power supply module
It is not limited.
Wherein, voltage transformation module 20 includes multiple voltage conversion circuits 21, switches switch 22 and output circuit 23,
In：Multiple voltage conversion circuits 21 are multiple and different to be converted to the DC input voitage provided by power supply module 10
DC output voltage；Switching switch 22 is operable one of to select in multiple voltage conversion circuits 21, so that selected
Voltage conversion circuit 21 DC input voitage is converted into corresponding DC output voltage；Output circuit 23, to the output phase
The DC output voltage answered；Wherein, switching switch 22 can be single pole multiple throw, and voltage conversion circuit 21 can be equipped with voltage
It is straight can be converted to 5V, 8.5V and 12V by converter by 21 circuit of multiple voltage conversion circuits for the DC input voitage of 12V
Output voltage is flowed, and corresponding output voltage is switched over by switching switch 22, to meet the power supply need of different active antennas
It asks.
Wherein, in voltage transformation module 20, multiple voltage conversion circuits 21 can be coupled to switching switch 22 with it is defeated
Go out between circuit 23, switching switch 22 is coupled with 10 phase of power supply module, and multiple electricity are selected to switch switch 22 by operation
One of in voltage conversion circuit 21, the DC input voitage provided by power supply module 10 is converted into corresponding direct current
Output voltage, specific connection relation can refer to shown in Fig. 3.Such as, switch switch 22 by operation to provide power supply module 10
12V DC input voltage be converted to 5V.Obviously, it will be appreciated by those skilled in the art that, in voltage transformation module 20
In, switching switch 22 can also be coupled between multiple voltage conversion circuits 21 and output circuit 23, multiple voltage conversion electricity
Road 21 is coupled with 10 phase of power supply module, and the direct current for being provided power supply module 10 by multiple voltage conversion circuits 21 is defeated
Enter after voltage is converted to multiple and different output voltages, switch one in the multiple output voltages of the selection of switch 22 by operation,
Selected output voltage is exported by output circuit 23.
It should be noted that the connection relation of multiple voltage conversion circuits and switching switch is not limited to above-mentioned setting,
In other embodiments, other settings can also be carried out.The utility model switchs multiple voltage conversion circuits and switching
Connection relation be not especially limited.
Wherein, signal separation module 30 are coupled between voltage transformation module 20, active antenna 2 and test receiver 3,
DC output voltage to export output circuit 23 supplies electricity to active antenna 2, and the radiofrequency signal that active antenna 2 is received
It is transmitted to test receiver 3.
A kind of power supply adaptor that the utility model embodiment provides is applied to electromagnetic compatibility vehicle radiation emission test,
Since the power supply adaptor is equipped with voltage transformation module, it can realize and switch different supply voltages, to ensure to test
The normal work of middle active antenna, while can ensure that test system will not introduce electromagnetic interference and influence test result；In addition,
The power supply adaptor is equipped with signal separation module, and signal separation module is coupled to voltage transformation module, active antenna and test and connects
Between receipts machine, the DC output voltage to export output circuit supplies electricity to active antenna, and is penetrated what active antenna received
Frequency signal transmission is to test receiver, and thus the power supply adaptor can carry out the separation of DC power supply and radiofrequency signal, with
The test request of power supply and signal extraction is realized while vehicle component intermediate frequency, very high frequency(VHF), L-band radiation emission test；Separately
Outside, compared with the electromagnetic compatibility vehicle radiation emission test connection type of the prior art, the power supply adaptor and active antenna and
Connection type between test receiver is simpler, can directly reduce the insertion loss brought by cable connection.
As a kind of embodiment of the utility model, also connect between power supply module 10 and voltage transformation module 20
Have fuse (not shown), due to fuse can because flow through its electric current it is excessive due to fuse, can be kept away by fuse
Exempt to damage Primary Component when electric current is excessive in circuit.
As a kind of embodiment of the utility model, with reference to shown in Fig. 3, power supply module 10 include a battery 11,
Power access end 12 and switching circuit 13, the battery 11 and power access end 12 pass through the switching circuit 13 and the electricity
Press conversion module connection 20, wherein power access end 12 is accessing external power supply 5；Switching circuit 13 according to power supply connecing
Enter whether end 12 accesses external power supply 5, one in switching selection power access end 12 and battery 11 and voltage transformation module 20
Connection, to provide DC input voitage to voltage transformation module 20, wherein power access end 12 is set to the surface of power supply adaptor
On, battery 11 and electrical switching circuit 13 are set on the inside of power supply adaptor.
As a kind of embodiment of the utility model, the charging of connection battery 11 is additionally provided on the surface of power supply adaptor
It holds (not shown), wherein the anti-jamming circuit being made of an inductance and multiple capacitances is connected between charging end and battery 11, thus
By increasing anti-jamming circuit between charging end and battery, realizes while charging to battery 11, can ensure outside
Power supply steadily charges to battery 11, eliminates surge, starting impulse and other impulse waveforms (such as ISO7637 pulses) to whole
The interference of a test system.
As a kind of embodiment of the utility model, output circuit 23 further includes being made of filter capacitor and filter inductance
Filter circuit 231.Due to, with very high ripple and interference, being filtered by being arranged in output circuit in output voltage
Circuit can eliminate the interference of 100K-3GHz signals, avoid electromagnetic compatibility test result unaffected, thus ensure electromagnetism
The reliability of compatible vehicle radiation emission test.
Wherein, filter circuit 231 can be Butterworth low pass wave circuit, which can be with
Using quadravalence Butterworth low pass wave network.Due to there is no any ripple in the attenuation curve of Butterworth filter, claimed
For maximum smoothing filter, therefore by setting filter circuit to Butterworth low pass wave circuit, can further ensure that
The reliability of electromagnetic compatibility vehicle radiation emission test.
As a kind of embodiment of the utility model, output circuit 23 further includes monitoring circuit 232, monitors circuit 232
Equipped with voltmeter and/or ammeter, wherein voltmeter and/or ammeter are arranged on the surface of power supply adaptor 1, thus lead to
Setting voltmeter and/or ammeter are crossed, the output voltage and/or electric current of output circuit 23 can be measured, to monitor offer constantly
To the supply voltage of active antenna, to intuitively find out whether antenna works, whether test system is normal.
To further illustrate power supply adaptor that the utility model embodiment is provided, switched below with power supply adaptor defeated
Go out for the supply voltage of 12V/8.5V/5V and illustrates.
Fig. 4 is the physical circuit figure for being the power supply module that the utility model embodiment provides, and wherein power supply supplies mould
Block 10 includes battery 11, power access end 12 and switching circuit 13, and power supply module 10 provides directly to voltage transformation module 20
Input voltage signal Vi is flowed, the voltage value of d.c. input voltage signal Vi is 12V, and with reference to shown in Fig. 4, power access end 12 is used
To access external power supply Vehicel Battery (external vehicle power supply vehicle KL.30, that is to say vehicle power supply itself), switching
Circuit 13 is coupled between battery 11 and power access end 12.Switching circuit 13 includes transistor M1, transistor M2, transistor
M3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and diode D1, wherein：Transistor M1 can be p-type field-effect
Pipe, transistor M2 and transistor M3 can be NPN type triode, and transistor M1, M2, M3 are respectively provided with a control terminal, resistance
The resistance value of R1 and resistance R4 are 10k ohm, the resistance value of resistance R2 and resistance R3 are 3.3k ohm, and the resistance value of resistance R5 is 100k
Ohm.Specifically, transistor M1 is coupled between battery 11 and voltage transformation module 20, transistor M3 is coupled to transistor M1
Control terminal and publicly between, transistor M2 be coupled to resistance R1 and publicly between；Power access end 12 passes through diode
D1 is coupled to voltage transformation module 20, and battery 11 is coupled to the control terminal of transistor M3 by resistance R1 and resistance R3, and power supply connects
Enter the control terminals that end 12 is also coupled to transistor M2 by resistance R2, resistance R4 be coupled to the control terminal of transistor M3 with publicly
Between, resistance R5 is coupled between battery 11 and the control terminal of transistor M1, wherein diode D1 has lower forward conduction
Voltage.When power access end 12 accesses external power supply, transistor M2 conductings, transistor M3 and transistor M1 are turned off, at this time
D.c. input voltage signal Vi is exported from external power supply to voltage transformation module 20, and when power access end 12 does not access external electrical
When source, transistor M2 cut-offs, transistor M3 and transistor M1 are both turned on, are exported directly from battery 11 to voltage transformation module 20 at this time
Flow input voltage signal Vi.Whether external power supply, switching selection electricity are accessed according to power access end from there through switching circuit 13
A connection between voltage transformation module 20 in source incoming end 12 and battery 11, to realize to voltage transformation module 20
DC input voitage Vi is provided.
Certainly, as those of ordinary skill in the art are readily appreciated, the circuit structure of above-mentioned switching circuit is simultaneously
Non- to realize according to whether power access end accesses external power supply, one in switching selection power access end and battery turns with voltage
The connection between block is changed the mold, to provide the unique selection of DC input voitage to voltage transformation module, further, it is also possible to pass through it
He is achieved at circuit structure form, is realized in switching selection power access end and battery as switched as switching using relay
One connect with voltage transformation module, the utility model embodiment is not limited specific switching circuit.
Fig. 5 is the physical circuit figure for the voltage transformation module that the utility model embodiment provides, which will
The DC input voitage of power supply module supply is converted to multiple and different DC output voltage, and can be to multiple and different straight
Stream output voltage switches over selection, to export corresponding DC output voltage, in conjunction with Fig. 5 to by voltage transformation module by power supply
The supply voltage for the 12V DC input voltage switching output 5V/8.5V/12V that supply module provides carries out respective description, such as Fig. 5
Shown, the 12V DC input voltage signal Vi that power supply module 10 exports is supplied to voltage transformation module by fuse F1
20, and convert the voltage into module 20 and export corresponding DC output voltage Vo, voltage transformation module 20 is converted including multiple voltages
Circuit 21, switching switch 22 and output circuit 23, wherein multiple voltage conversion circuits 21 are coupled to switching switch 22 and output electricity
Between road 23, fuse F1 is connected with the moved end of switching switch 22；Switch the tie point of the moved end and fuse F1 of switch 22
It is connected with the anode of a Light-emitting diode LED 1, the cathode of the Light-emitting diode LED 1 is connect publicly by a resistance R6,
In, Light-emitting diode LED 1 plays indicative function to whether power supply adaptor works normally.Certainly, such as ordinary skill people
Member is readily appreciated, and the circuit structure of above-mentioned multiple voltage conversion circuits is not to realize to supply power supply module
The DC input voitage answered is converted to the unique selection of multiple and different DC output voltage, can also multiple voltages be converted electricity
Road is designed to that other circuit structure forms, the utility model embodiment are not limited specific voltage conversion circuit.
Shown in Fig. 5, three non-moving ends of switching switch 22 are connected respectively to three voltage conversion circuits
The output end of 21 input terminal, three voltage conversion circuits 21 is connected with each other；For convenience of description, three voltage conversion circuits 21
It is indicated with first voltage conversion circuit, second voltage conversion circuit and tertiary voltage conversion circuit, wherein first voltage turns
It is a conducting wire to change circuit；12V DC input voltage is converted to the direct current output electricity of 5V to realize by second voltage conversion circuit
12V DC input voltage is converted to the DC output voltage of 8.5V to realize by pressure, tertiary voltage conversion circuit, wherein the
Two voltage conversion circuits include electric pressure converter U1, capacitance C1 parallel with one another and capacitance C2 and capacitance C3 parallel with one another and
Capacitance C4, wherein electric pressure converter U1 is LM7805 electric pressure converters, the tie point and electricity of the one end capacitance C1 and the one end capacitance C2
The input terminal of pressure converter U1 is connected, the output end of the tie point and electric pressure converter U1 of the one end capacitance C3 and the one end capacitance C4
Be connected, the capacitance C1 other ends, the capacitance C2 other ends, the capacitance C3 other ends, the capacitance C4 other ends and U1 ground terminal be all connected with
Publicly；Tertiary voltage conversion circuit includes electric pressure converter U2, capacitance C5 parallel with one another and capacitance C6 and parallel with one another
Capacitance C7 and capacitance C8, wherein electric pressure converter U2 be LM7808 electric pressure converters, tertiary voltage conversion circuit and second electricity
The connection structure of voltage conversion circuit is identical, and details are not described herein again.
Shown in Fig. 5, the output end of filter circuit and three voltage conversion circuits 21 in output circuit 23 is equal
It mutually couples, which includes capacitance C9, capacitance C10, inductance L1 and inductance L2, wherein one end of capacitance C9 and inductance L1
One end be connected, another termination of capacitance C9 publicly, the one of the other end of inductance L1 and one end of inductance L2 and capacitance C10
The tie point at end is in series, and publicly, the other end of inductance L2 connects voltage output end Vo, voltage to another termination of capacitance C10
Output end vo exports DC output voltage, wherein capacitance C9 is identical as the capacitance of capacitance C10, is 100uF, inductance L1's
Inductance value is 740uH, and the inductance value of inductance L2 is 1mH.
Shown in Fig. 5, the monitoring circuit in output circuit 23 is equipped with ammeter A1 and voltmeter V1, wherein electric current
Between Table A 1 series inductance L1 and inductance L2, one end of voltmeter V1 is connected with ammeter A1, another termination of voltmeter V1
Publicly.
As a kind of embodiment of the utility model, with reference to shown in Fig. 6, Fig. 6 is that the utility model embodiment provides
The physical circuit figure of signal separation module, wherein signal separation module 30 includes inductance L3, isolation capacitance C11, rf inputs
RF1 and RF output end RF2, rf inputs RF1 and RF output end RF2 are set on the surface of power supply adaptor, radio frequency
Input terminal RF1 is used for connecting test receiver for connecting active antenna, RF output end RF2, and isolation capacitance C11, which is connected on, to be penetrated
Between frequency input terminal RF1 and RF output end RF2, inductance L3 is connected on the output end and RF output end RF2 of output circuit 23
Between, to receive the direct current output voltage signal Vo of the output of output circuit 23, isolation capacitance C11 is connected with inductance L3.Thus
The power supply adaptor can carry out the separation of DC power supply and radiofrequency signal, in vehicle component intermediate frequency, very high frequency(VHF), L-band
The test request of power supply and signal extraction is realized while radiation emission test.
The power supply adaptor of the utility model can be equivalent at a two-port network, a termination input signal, the other end
Output signal is connect, using Port 1 as the input port of signal, output ports of the Port 2 as signal, S21It indicates to be inserted into damage
Consumption, that is, how many energy have been transferred to destination (Port 2), this value is the bigger the better, and ideal value is 1, that is,
0dB carries out insertion loss S21 surveys in intermediate frequency, very high frequency(VHF) and L-band band limits to the power supply adaptor of the utility model
Examination, for insertion loss test result as shown in Fig. 7 a~Fig. 7 c, Fig. 7 a~Fig. 7 c are the power supply adaptor of the utility model respectively
Insertion loss test result schematic diagram in intermediate frequency, very high frequency(VHF) and L-band band limits, can be intuitive from Fig. 7 a and Fig. 7 b
Find out, the power supply adaptor of the utility model is in intermediate frequency (520KHz-1.73MHz) and very high frequency(VHF) (76MHz-108MHz) range
Interior, insertion loss is smaller, and insertion loss is less than 0.7dB；Can intuitively it find out in L-band (1568MHz- from Fig. 7 c
1583MHz), insertion loss is less than 2dB, which can be modified by EMC32 test softwares, it is ensured that experiment number
According to true and reliable.
The power supply adaptor of the utility model is accessed into vehicle electromagnetic compatibility radiation emission test system, in intermediate frequency
Into line frequency in (520KHz-1.73MHz), very high frequency(VHF) (76MHz-108MHz) and L-band (1568MHz-1583MHz) band limits
Spectrum test, test result as shown in Fig. 8 a~Fig. 8 c, Fig. 8 a~Fig. 8 c be respectively the utility model power supply adaptor intermediate frequency,
The vehicle radiation-emitting spectrum measurement result schematic diagram of very high frequency(VHF) and L-band, measured background noise are less than limit value 6dB, stay
There are enough test allowances, and be not introduced into broadband and narrowband interference, good can be applied in the experiment of vehicle radiation-emitting.
Above-mentioned all optional technical solutions, may be used the alternative embodiment that any combination forms the utility model, herein
No longer repeat one by one.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all in this practicality
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (10)
1. a kind of power supply adaptor is applied to electromagnetic compatibility vehicle radiation emission test, which is characterized in that supply mould including power supply
Block, voltage transformation module and signal separation module；Wherein,
The power supply module is coupled to the voltage transformation module, to provide a direct current to the voltage transformation module
Input voltage；
The voltage transformation module includes：
Multiple voltage conversion circuits, the DC input voitage to be converted to multiple and different DC output voltage；
Switching switch, it is operable one of to select in the multiple voltage conversion circuit, so that selected voltage turns
It changes circuit and the DC input voitage is converted into corresponding DC output voltage；
Output circuit, to export corresponding DC output voltage；
The signal separation module is coupled between the voltage transformation module, active antenna and test receiver, to by institute
The DC output voltage for stating output circuit output supplies electricity to the active antenna, and the radiofrequency signal that the active antenna is received
It is transmitted to the test receiver.
2. power supply adaptor according to claim 1, which is characterized in that the power supply module includes battery, power supply
Incoming end and switching circuit；
The battery and the power access end are connect by the switching circuit with the voltage transformation module；
Wherein, the switching circuit, whether to access external power supply according to the power access end, switching selects the power supply
One in incoming end and the battery connect with the voltage transformation module, described straight to be provided to the voltage transformation module
Flow input voltage.
3. power supply adaptor according to claim 2, which is characterized in that the switching circuit includes transistor M1, crystal
Pipe M2, transistor M3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and diode D1, wherein：
The transistor M1 is coupled between the battery and the voltage transformation module, and the transistor M3 is coupled to the crystalline substance
The control terminal of body pipe M1 and publicly between, the transistor M2 be coupled to the resistance R1 and it is described publicly between；
The power access end is coupled to the voltage transformation module by the diode D1, and the battery passes through the resistance
The R1 and resistance R3 is coupled to the control terminal of the transistor M3, and the power access end is also coupled to by the resistance R2
The control terminal of the transistor M2, the resistance R4 be coupled to the transistor M3 control terminal and it is described publicly between, institute
Resistance R5 is stated to be coupled between the battery and the control terminal of the transistor M1.
4. power supply adaptor according to claim 1, which is characterized in that
The multiple voltage conversion circuit is coupled between the switching switch and the output circuit；Or
The switching switch is coupled between the multiple voltage conversion circuit and the output circuit.
5. power supply adaptor according to claim 1 or 4, which is characterized in that the switching switch is single pole multiple throw.
6. power supply adaptor according to claim 1, which is characterized in that the DC input voitage is 12V, the direct current
Output voltage is 12V or 8.5V or 5V.
7. power supply adaptor according to claim 1, which is characterized in that the output circuit further include by filter inductance and
The filter circuit that filter capacitor is constituted.
8. power supply adaptor according to claim 7, which is characterized in that the filter circuit is Butterworth low pass wave
Circuit.
9. power supply adaptor according to claim 1, which is characterized in that the output circuit further includes monitoring circuit, institute
It states monitoring circuit and is equipped with voltmeter and/or ammeter.
10. power supply adaptor according to claim 1, which is characterized in that the signal separation module includes inductance, isolation
Capacitance, rf inputs and RF output end；
The rf inputs are for connecting the active antenna, and the RF output end is for connecting the test receiver；
The isolation capacitance is connected between the rf inputs and the RF output end, and the inductance is connected on described defeated
Go out between the output end of circuit and the RF output end, and the isolation capacitance is connected with the inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820125304.4U CN207720120U (en) | 2018-01-25 | 2018-01-25 | A kind of power supply adaptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820125304.4U CN207720120U (en) | 2018-01-25 | 2018-01-25 | A kind of power supply adaptor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207720120U true CN207720120U (en) | 2018-08-10 |
Family
ID=63052967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820125304.4U Active CN207720120U (en) | 2018-01-25 | 2018-01-25 | A kind of power supply adaptor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207720120U (en) |
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2018
- 2018-01-25 CN CN201820125304.4U patent/CN207720120U/en active Active
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