CN204666675U - High-frequency bias current source - Google Patents
High-frequency bias current source Download PDFInfo
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- CN204666675U CN204666675U CN201520208549.XU CN201520208549U CN204666675U CN 204666675 U CN204666675 U CN 204666675U CN 201520208549 U CN201520208549 U CN 201520208549U CN 204666675 U CN204666675 U CN 204666675U
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Abstract
The utility model is applicable to component test equipment field, provide high-frequency bias current source, described high-frequency bias current source comprises PCB mainboard, described PCB mainboard is provided with rectification module, central processing unit, first current source, second current source, first tuner module and second tune module, the output terminal of described rectification module connects input end and first current source of described central processing unit respectively, the input end of the second current source, the output terminal of described first current source connects the input end of described first tuner module, the output terminal of described second current source connects the input end of described second tune module, the output terminal of described central processing unit connects described first current source respectively, the control end of the second current source.Stoping passing through of interchange by setting up tuned circuit, the frequency range of high-frequency bias current source being expanded, makes the output current of high-frequency bias current source be divided into increase, the structure of its equipment is simple, easy to use, of many uses.
Description
Technical field
The utility model belongs to component test equipment field, particularly relates to high-frequency bias current source.
Background technology
Inductor product on current components and parts market normally needs test.These products are applied in the Switching Power Supply of consumer electronics mostly.And these power supplys are the necessary parts of household equipment and commercial unit substantially, from charger for mobile phone, computer power has use to large-scale aircraft and boats and ships.In order to check design and the performance of these inductance, by DC bias current by these inductance, must see that can these inductance meet specification. be all will carry out this test in the design phase or in the production phase.
Testing apparatus needs to assess these magnetic core performances, and equipment is made up of electric impedance analyzer and bias current sources usually, and bias current sources can the maximum operating currenbt of sampling test, and electric impedance analyzer at least needs the frequency covering sample work.Electric impedance analyzer is wanted to operate bias current sources collaborative work together simultaneously.
Now, current source is on the market all substantially all by frequency limitation, and common frequency range is 3MHz.This is because the electric impedance analyzer of high bias direct current source coupling high frequency is very difficult, the reason of difficulty is caused to be not only the problem in DC bias current source.
Utility model content
The purpose of this utility model is to provide a kind of high-frequency bias current source, is intended to solve above-mentioned technical matters.
The utility model realizes like this, a kind of high-frequency bias current source, described high-frequency bias current source comprises PCB mainboard, described PCB mainboard is provided with rectification module, central processing unit, first current source, second current source, first tuner module and second tune module, the output terminal of described rectification module connects input end and first current source of described central processing unit respectively, the input end of the second current source, the output terminal of described first current source connects the input end of described first tuner module, the output terminal of described second current source connects the input end of described second tune module, the output terminal of described central processing unit connects described first current source respectively, the control end of the second current source.
Further technical scheme of the present utility model is: described first tuner module is identical with second tune modular structure, comprises electric capacity C1 and inductance L 1, and described electric capacity C1 is in parallel with described inductance L 1.
Further technical scheme of the present utility model is: state on PCB mainboard and be also provided with display module, and the input end of described display module connects the output terminal of described central processing unit, and the output terminal of described display module connects the input end of display screen.
Further technical scheme of the present utility model is: described high-frequency bias current source also comprises input keyboard, and described input keyboard output terminal connects the input end of described central processing unit.
Further technical scheme of the present utility model is: described high-frequency bias current source also comprises casing, and described PCB mainboard is located in described casing, and described display screen and input keyboard are all located on the panel of described casing.
Further technical scheme of the present utility model is: be also provided with stabilized voltage supply in described casing, export seat and input seat, the output terminal of described stabilized voltage supply connects the input end of described PCB mainboard, the output terminal of described PCB mainboard connects the input end of described output seat, the input end of described PCB mainboard also connects the output terminal of described input seat, and described output seat is all located on the panel of described casing with input seat.
Further technical scheme of the present utility model is: the output voltage of described rectification module is respectively direct current 24V and the positive and negative 12V of direct current.
The beneficial effects of the utility model are: stop passing through of interchange by setting up tuned circuit, the frequency range of high-frequency bias current source is expanded, the output current of high-frequency bias current source is made to be divided into increase, the structure of its equipment is simple, coordinate electric impedance analyzer one-stoply can complete required test parameter at some antenna wireless transmission related devices of test, direct current resistance is had at wireless transmission primary test parameter, AC resistance, quality factor, the inductance value of the inductance not adding bias current and the telefault adding bias current, the series resonance frequency of telefault and relevant match circuit and parallel resonance frequency, test accurately, precision is high, easy to use.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the high-frequency bias current source that the utility model embodiment provides;
Fig. 2 is the structural drawing that the utility model embodiment provides electric impedance analyzer and bias current sources collaborative work;
Fig. 3 is that the utility model embodiment provides bias current sources design to introduce the structural drawing of stray capacitance Cx and Cy;
Fig. 4 is that the utility model embodiment provides the add ons L1+C1 of display and L2+C2 to modulate the load effect figure of Z1-Z3.。
Embodiment
Fig. 1 shows the high-frequency bias current source that the utility model provides, described high-frequency bias current source comprises PCB mainboard, described PCB mainboard is provided with rectification module, central processing unit, first current source, second current source, first tuner module and second tune module, the output terminal of described rectification module connects input end and first current source of described central processing unit respectively, the input end of the second current source, the output terminal of described first current source connects the input end of described first tuner module, the output terminal of described second current source connects the input end of described second tune module, the output terminal of described central processing unit connects described first current source respectively, the control end of the second current source.Passing through of interchange is stoped by setting up tuned circuit, the frequency range of high-frequency bias current source is expanded, the output current of high-frequency bias current source is made to be divided into increase, the structure of its equipment is simple, coordinate electric impedance analyzer one-stoply can complete required test parameter at some antenna wireless transmission related devices of test, direct current resistance is had at wireless transmission primary test parameter, AC resistance, quality factor, the inductance value of the inductance not adding bias current and the telefault adding bias current, the series resonance frequency of telefault and relevant match circuit and parallel resonance frequency, test accurately, precision is high, easy to use.
Described first tuner module is identical with second tune modular structure, comprises electric capacity C1 and inductance L 1, and described electric capacity C1 is in parallel with described inductance L 1.
State on PCB mainboard and be also provided with display module, the input end of described display module connects the output terminal of described central processing unit, and the output terminal of described display module connects the input end of display screen.
Described high-frequency bias current source also comprises input keyboard, and described input keyboard output terminal connects the input end of described central processing unit.
Described high-frequency bias current source also comprises casing, and described PCB mainboard is located in described casing, and described display screen and input keyboard are all located on the panel of described casing.
Also be provided with stabilized voltage supply in described casing, export seat and input seat, the output terminal of described stabilized voltage supply connects the input end of described PCB mainboard, the output terminal of described PCB mainboard connects the input end of described output seat, the input end of described PCB mainboard also connects the output terminal of described input seat, and described output seat is all located on the panel of described casing with input seat.
The output voltage of described rectification module is respectively direct current 24V and the positive and negative 12V of direct current.
In order to coordinate 6500 series impedance analyser collaborative works, 6500 series impedance analysers can measure Passive components frequency range and cover 20Hz to 120MHz.When the value of 6500 test components, need the DC bias current that 10A is provided.Owing to needing to provide maximum electric current to be 40A, and frequency of operation can reach 120MHz.
It seems there is no what difficulty from surperficial word, but high-current semiconductor there are very large stray capacitance, very slow switching speed and very low output impedance usually.When exporting large DC bias current, the test signal of isolated impedance analyser test high frequency will be an important problem.DC bias current source not only will ensure very little capacitive but also will ensure very little resistive load, and must keep constant value in the scope of test.If do not accomplish these, this is by the serious measuring accuracy having influence on electric impedance analyzer.So far DC bias current source is not had can to work (120MHz to 40A) under high frequency and high electric current.
Fig. 2 display to be usual bias current sources control two contrary and size is identical current sources by a control center forms.Current source generation current flows through measured object (DUT).A larger electric capacity maintains the filling circuit of 6V.When closing bias electric current, maintain this current potential by SW1 control circuit.When opening bias current, this voltage is maintained by two current sources.Only have when bias current sources is opened, electric impedance analyzer just carries out testing measured object.
From Fig. 3, we can find out that bias current sources is not very perfect, and it can introduce stray capacitance Cx and Cy.Each may 10,000pF.These electric capacity do not wish very much to exist, because they can pass through test signal cross-couplings and the shunting of 24V power supply and electric impedance analyzer.Because 24V power supply can regard an AC signal short circuit as, if we carry out T to π conversion, as Fig. 3, we can see three impedances, Z1, Z2, Z3.Z2 is arriving of least thinking, because it is in parallel with measured object, these impedances also can change along with the size variation of bias current in addition, therefore may by they calibration zeros.
In order to avoid the problems referred to above, in existing technology, use a kind of method, adopt tuned circuit, as Fig. 4, L1 here, the resistance value that C1 and L2, C2 can follow the test frequency according to test electric bridge to provide relatively high.This technology can cover the frequency range of needs by being switched on or switched off different inductance and electric capacity.But technology has several subject matter in this, in order to cover intermediate frequency, inductance needs very large value, for example a 500uH.In order to reach maximum bias current, these coils and magnetic core must be very large, in order to keep away saturation effect, but in reality, equipment can be allowed to become very large and heavy.A larger problem occurs in low frequency, and in audiorange, what benefit LC resonance technique there is no, the loss in phase stiffness and correlated current source is also to ignore.These situations usually occur in about 10kHz, cannot find suitable inductance.More reluctant is that these losses are just equivalent to, the test port of an electric impedance analyzer impedance (Loss impedance) in parallel, need to adopt a variety of impedance-compensated mode could calibrate these mistakes.Same in spectral frequency range, the choking coil of Large heavy and high current relay are not suitable for the isolation to RF signal.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (7)
1. high-frequency bias current source, it is characterized in that: described high-frequency bias current source comprises PCB mainboard, described PCB mainboard is provided with rectification module, central processing unit, first current source, second current source, first tuner module and second tune module, the output terminal of described rectification module connects input end and first current source of described central processing unit respectively, the input end of the second current source, the output terminal of described first current source connects the input end of described first tuner module, the output terminal of described second current source connects the input end of described second tune module, the output terminal of described central processing unit connects described first current source respectively, the control end of the second current source.
2. high-frequency bias current source according to claim 1, is characterized in that, described first tuner module is identical with second tune modular structure, comprises electric capacity C1 and inductance L 1, and described electric capacity C1 is in parallel with described inductance L 1.
3. high-frequency bias current source according to claim 1 and 2, it is characterized in that, state on PCB mainboard and be also provided with display module, the input end of described display module connects the output terminal of described central processing unit, and the output terminal of described display module connects the input end of display screen.
4. high-frequency bias current source according to claim 3, is characterized in that, described high-frequency bias current source also comprises input keyboard, and described input keyboard output terminal connects the input end of described central processing unit.
5. high-frequency bias current source according to claim 4, is characterized in that, described high-frequency bias current source also comprises casing, and described PCB mainboard is located in described casing, and described display screen and input keyboard are all located on the panel of described casing.
6. high-frequency bias current source according to claim 5, it is characterized in that, also be provided with stabilized voltage supply in described casing, export seat and input seat, the output terminal of described stabilized voltage supply connects the input end of described PCB mainboard, the output terminal of described PCB mainboard connects the input end of described output seat, the input end of described PCB mainboard also connects the output terminal of described input seat, and described output seat is all located on the panel of described casing with input seat.
7. high-frequency bias current source according to claim 6, is characterized in that, the output voltage of described rectification module is respectively direct current 24V and the positive and negative 12V of direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520208549.XU CN204666675U (en) | 2015-04-09 | 2015-04-09 | High-frequency bias current source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520208549.XU CN204666675U (en) | 2015-04-09 | 2015-04-09 | High-frequency bias current source |
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| Publication Number | Publication Date |
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| CN204666675U true CN204666675U (en) | 2015-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520208549.XU Expired - Fee Related CN204666675U (en) | 2015-04-09 | 2015-04-09 | High-frequency bias current source |
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| CN (1) | CN204666675U (en) |
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2015
- 2015-04-09 CN CN201520208549.XU patent/CN204666675U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150923 Termination date: 20160409 |
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| CF01 | Termination of patent right due to non-payment of annual fee |