CN107272806A - The high-power VCCS of multitube parallel coupled using isolating transformer - Google Patents
The high-power VCCS of multitube parallel coupled using isolating transformer Download PDFInfo
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- CN107272806A CN107272806A CN201710666222.0A CN201710666222A CN107272806A CN 107272806 A CN107272806 A CN 107272806A CN 201710666222 A CN201710666222 A CN 201710666222A CN 107272806 A CN107272806 A CN 107272806A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention belongs to linear power supply design field, and in particular to the high-power VCCS of multitube parallel coupled using isolating transformer.To meet the use demand of needs large power test power supply application scenario, the fan-out capability of the traditional voltage-controlled current source of lifting, and the problem of evade when power operational amplifier is in parallel due to amplifier operation state is different and produces current reflux and burn amplifier, the present invention devises a kind of new high-power VCCS.The current source circuit couples the output end of multiple fundamental current source units by using isolating transformer, so as to export the current signal of an amplitude multiplication in isolating transformer secondary side.This mode has cleverly obstructed the electrical link of parallel amplifier circuit, obtains the multiplication of electric current in Circuit Fault on Secondary Transformer by electromagnetic induction.The problem of final current reflux for avoiding producing by each amplifier operation state difference burns amplifier, and reach the purpose of High-current output.
Description
Technical field
The invention belongs to linear power supply design field, and in particular to the multitube parallel coupled using isolating transformer is high-power
Current source, realizes voltage to the conversion of electric current, output controllable current signal is with applied to field of electrical testing.
Background technology
VCCS (VCCS), also known as voltage-power pack, belong to one kind of constant-current source, be it is a kind of can be by
Input voltage signal changes into the circuit for the current signal output that there is fixed multiplying power relation with it.The current source of this structure exists
Electrically with extensive application in Electronic Testing field.
Concrete application field includes：Large power semiconductor device test, kinescope, the vacuum original paper such as power emission tube are opened
Move.In the characteristic test of large power semiconductor device, VCCS can play the effect of driving source；Started in vacuum component
Cheng Zhong, to prevent because disintegration of filament VCCS can provide constant starting current caused by inrush current；In ammeter school
Field is tested, VCCS is used at the same time as a reference source；In motor torque control aspect, VCCS can provide a stable driving
Electric current, because torque is that current driver mode in the direct function of current of electric, servo loop can be reduced by electronic electromechanics
Delayed phase caused by sense；In power measurement field, VCCS can provide one accurately for the test of conductor AC and DC resistance
Test electric current.
In the application scenario of small-power current source, typically directly low current is realized using operational amplifier and mu balanced circuit
Output, circuit is into close-loop control mode.
In the application scenario of high-power current source, normal operation amplifier closed loop configuration is limited due to fan-out capability, leads to
High-current output is realized frequently with high-power darlington pipe constant power device, but this mode can reduce measuring accuracy.
A kind of common float duty type VCCS circuit diagrams are negative as shown in figure 1, its amplifier out is directly connected with load
The other end is carried directly by connecting sampling resistor RS ground connection, its input and output transmission function relational expression is：
A kind of common ground connection support type VCCS circuit diagrams are as shown in Fig. 2 its amplifier out and sampling resistor RSIt is connected,
And lead in RSTwo ends collection voltages signal forms positive-negative feedback, and its input and output transmission function relational expression is：
Both current source structure very simples are practical, but single operational amplifier fan-out capability is limited, it is impossible to obtain big
Current signal is used to large power test occasion.
It is a kind of based on load float type VCCS two-tube parallel connection type current source as shown in figure 3, its circuit structure Fig. 1 base
On plinth in the form of voltage follower an identical power operational amplifier in parallel so that the electricity of original single amplifier output
Flow point load is exported jointly to two amplifiers, theoretically improves amplifier safety operation area, its input and output transmission function
Relational expression is：
A kind of two-tube parallel connection type current source based on carrying ground type VCCS as shown in figure 4, its circuit structure Fig. 2 base
On plinth in the form of voltage follower an identical power operational amplifier in parallel, this structure make it that the energy from amplifier is defeated
Go out the electric current with main amplifier formed objects, the fan-out capability for the whole circuit that theoretically doubled.
But in practical operation, it is difficult to reach that two are in identical working condition even more than amplifier, but parallel connection is put
The difference of big device working condition can cause to produce voltage difference between parallel transistor, be returned so as to produce electric current between two amplifiers
Stream, the phenomenon of this backflow can cause the loss of big energy, it is also possible to circuit is produced self-oscillation, or even burn out amplifier
Chip.Therefore Fig. 3, operability is not strong in actual applications for Fig. 4 both parallel-connection structures.
The content of the invention
To meet the actual test use demand in high-power current source application scenario, the output of booster tension control electric current source
Ability, and as far as possible ensure High-current output in the case of, power operational amplifier trouble free service, the present invention devise using every
From the transformer coupled high-power VCCS of multitube parallel, its network topology structure as shown in figure 5, concrete scheme such as
It is lower described.
The high-power VCCS of multitube parallel coupled using isolating transformer, it is characterised in that including：Control
Voltage signal source UAC, VCCS cell Si, wherein (i=1,2 ..., n-1), n winding isolation transformers T0, isolation
N-1 winding of transformer primary side is serially connected in the output loop of n-1 VCCS unit respectively, isolating transformer
Secondary side as the high-power current source output terminating load.
The high-power VCCS of multitube parallel of described use isolating transformer coupling, it is characterised in that become
N-1 VCCS unit of depressor primary side is with identical circuit topological structure, for load float type or ground connection
Type.
The high-power VCCS of multitube parallel of described use isolating transformer coupling, it is characterised in that become
The excitation end for the n-1 VCCS unit output loop that depressor primary side is concatenated needs all individual with primary side n-1
The Same Name of Ends of winding is connected.
A kind of high-power current source of multitube parallel of described use isolating transformer coupling, it is characterised in that n windings every
From transformer T0The number of turn N of n-1 winding of primary side1=N2=...=Nn‐1。
The high-power VCCS of multitube parallel of described use isolating transformer coupling, it is characterised in that：Institute
State n winding isolation transformers T0First side winding number n-1 be primary side concatenate the number of VCCS can be according to tool
Body requirement of experiment is modified；The n winding isolation transformers T0Core dimensions can be according to specific power demand, signal with material
Frequency needs suitably selection, with changing, is silicon steel sheet, ferrite, permalloy, non-crystaline amorphous metal etc.；The n windings isolate transformation
Device T0Per phase winding number of turn N1、N2、…、Nn‐1、NnSelection can be carried out according to specific experiment demand utilization design of transformer principle
Calculate.
Assuming that each VCCS unit output current of primary side is with control voltage signal source transformational relation：
I1=k1UAC
I2=k2UAC
…
In-1=kn-1UAC
The high-power VCCS input and output transformational relation of multitube parallel of the use isolating transformer coupling
Formula is：
The beneficial effect that the present invention reaches has：
First, multiple current source outputs are coupled by introducing isolating transformer, circuit output ability is enhanced, makes voltage
Control electric current source can obtain larger output current while output accuracy is ensured
Second, utilize the electrical connection of the construction insulation bridging amplifier of isolating transformer so that in circuit output current
The electric current produced when having evaded normal operation amplifier in parallel on the premise of multiplication due to the voltage difference between two amplifiers
Backflow phenomenon.
3rd, new method is provided for the development in high current source, can be coupled in the case of transformer is sufficiently large more
Amplifier so as to further lifted circuit output ability.
Brief description of the drawings
Fig. 1 is basic load float type VCCS circuit；
Fig. 2 is basic load earthing type VCCS circuit；
Fig. 3 is the two-tube parallel connection type current source based on load float type VCCS；
Fig. 4 is the two-tube parallel connection type current source based on carrying ground type VCCS；
Fig. 5 is the high-power VCCS network topology structure figure of multitube parallel coupled using isolating transformer；
Use isolating transformers of the Fig. 6 based on load float type VCCS couples the high-power current source circuit of multitube parallel；
Use isolating transformer coupling multitube parallel high-power current source circuits of the Fig. 7 based on carrying ground type VCCS；
Embodiment
To make the purpose of the present invention and technical scheme of greater clarity, below in conjunction with the accompanying drawings 6,7, pass through specific embodiment
The present invention is described further；It should be understood that these descriptions are merely illustrative, and it is not intended to limit the scope of the present invention.
Specific embodiment one
Present embodiment is more for the use isolating transformer coupling based on loading float type VCCS
Pipe high-power current source circuit in parallel, applied to the test of large size conductor AC resistance.Its schematic diagram is as shown in fig. 6, maximum defeated
Go out for 13.5V/40A, including：Control voltage signal source UAC, the positive and negative power supply V of power operational amplifierS+, VS‐, Power arithmetic
Amplifier A1With power operational amplifier A2, feedback resistance Rf, sampling resistor RS, multi-winding isolation transformer T0。
The control voltage signal source UACWith power operational amplifier A1And A2Inverting input connection, the same phase of amplifier
Input end grounding, the primary side T of the multi-winding isolation transformer0Two winding one end are directly connected to two amplifier outs,
The multi-winding isolation transformer T0Two winding other ends of primary side respectively with two sampling resistor RSBe connected, it is described it is many around
Group isolating transformer T0Secondary side winding directly concatenates load as the output end of this current source and forms loop.
The standard voltage signal source UACAmplitude is 0~4V, 50~400Hz of frequency.
The rate operational amplifier A1With power operational amplifier A2It is Apex PA50.
The positive and negative power supply V of power operational amplifierS+, VS‐Respectively+24V, -24V..
The multi-winding isolation transformer selects three winding, number of turn selection N1=N2=N3=3 circles.
The three winding isolating transformer core material uses silicon steel sheet.
Further, feedback resistance RfResistance is 2K Ω.
Further, sampling resistor RSResistance is 0.2 Ω.
Further, in order to evade present production process defect, two sampling resistor RS50 precision are all used for 0.1%
The parallel connection of 10 Ω/10W high-power aluminum casing resistors obtain the high accuracy in 0.2 Europe, Low Drift Temperature, high-power small valued resistor.
Further, the high-power electricity of multitube parallel of the use isolating transformer coupling can be derived by circuit general principle
The input and output transmission function in stream source is：
When control signal source voltage magnitude is 4V, the electric current output of stable 40A amplitudes can be obtained in Circuit Fault on Secondary Transformer.
Specific embodiment two
Present embodiment is more for the use isolating transformer coupling based on carrying ground type VCCS
Pipe high-power current source circuit in parallel, applied to the test of large size conductor AC resistance.Its schematic diagram is as shown in fig. 7, maximum defeated
Go out for 13.5V/40A, including：Control voltage signal source UAC, the positive and negative power supply V of power operational amplifierS+, VS‐, Power arithmetic
Amplifier A1With power operational amplifier A2, feedback resistance Rf, input resistance Rin, sampling resistor RS, multi-winding isolation transformer
T0。
The standard voltage signal source UACPass through two input resistance R respectivelyin, be connected with amplifier inverting input, work(
Rate operational amplifier A 1, A2 in-phase input end by distinguishing two input resistance R in additioninGround connection, the Multiple coil isolation becomes
Depressor T0Two winding one end of primary side pass through power operational amplifier A respectively1And A2Respective transfer resistance RSIt is connected to amplification
The output end of device, the multi-winding isolation transformer T0Two winding other end ground connection of primary side, the Multiple coil isolates transformation
Device T0Secondary side winding directly concatenates load as the output end of this current source and forms loop.
The control voltage signal source UACAmplitude is 0~2V, 50~400Hz of frequency.
The power operational amplifier A1With power operational amplifier A2It is Apex PA50.
The positive and negative power supply V of power operational amplifierS+, VS‐Respectively+24V, -24V..
The multi-winding isolation transformer selects three side windings, number of turn selection N1=N2=N3=3 circles.
The three winding isolating transformer core material uses silicon steel sheet.
Further, input resistance RinResistance is 10K Ω.
Further, feedback resistance RfResistance is 20K Ω.
Further, sampling resistor RSResistance is 0.2 Ω.
Further, in order to evade present production process defect, two sampling resistor RS50 precision are all used for 0.1%
The parallel connection of 10 Ω/10W high-power aluminum casing resistors obtain the high accuracy in 0.2 Europe, Low Drift Temperature, high-power small valued resistor.
Further, the high-power electricity of multitube parallel of the use isolating transformer coupling can be derived by circuit general principle
The input and output transmission function in stream source is：
When standard signal source voltage magnitude is 2V, the electric current output of stable 40A amplitudes can be obtained in Circuit Fault on Secondary Transformer.
The present invention devises new circuit structure on the basis of conventional current source structure, by introducing isolating transformer coupling
Close the output end of multiple baseline current-sources, using electromagnetic induction Circuit Fault on Secondary Transformer obtain electric current multiplication, this circuit with
Conventional current source circuit is compared to have stronger fan-out capability and compare and obtained using high-power darlington pipe constant power device
Obtain this circuit of method of high current has higher output accuracy again；The amplifier of parallel connection has been obstructed using isolating transformer simultaneously
The electrical connection of pipe, has effectively evaded conventional parallel structure motor current source and has exported amplifier Direct Current time under this method
The hidden danger for flowing and causing amplifier to burn, so as to further improve the security reliability of current source work.
General principle, principal character and the advantage of the present invention has been shown and described above, the present invention is not by above-described embodiment
Limitation, on the premise of the principle of the invention and thinking is not departed from, the present invention also have a variety of changes and improvements, these change
Both fallen within improvement in protection scope of the present invention.
Claims (5)
1. the high-power VCCS of multitube parallel coupled using isolating transformer, it is characterised in that including：Control electricity
Press signal source UAC, VCCS cell Si, wherein (i=1,2 ..., n-1), n winding isolation transformers T0, isolation change
N-1 winding of depressor primary side is serially connected in the output loop of n-1 VCCS respectively, isolating transformer secondary side
It is used as the output terminating load of the high-power current source.
2. the high-power VCCS of multitube parallel of use isolating transformer coupling according to claim 1, its
It is characterised by, n-1 VCCS unit of transformer primary side has identical circuit topological structure, is floated for load
Type or earthing type.
3. the high-power VCCS of multitube parallel of use isolating transformer coupling according to claim 1, its
Be characterised by, the excitation end of the n-1 VCCS output loop that transformer primary side is concatenated need all with once
The Same Name of Ends of the winding of side n-1 is connected.
4. the high-power VCCS of multitube parallel of use isolating transformer coupling according to claim 1, its
It is characterised by, n winding isolation transformers T0The number of turn N of n-1 winding of primary side1=N2=...=Nn-1。
5. the high-power VCCS of multitube parallel of use isolating transformer coupling according to claim 1, its
It is characterised by, the n winding isolation transformers T0First side winding number n-1 is that primary side concatenates VCCS
Number can be modified according to specific experiment requirement；The n winding isolation transformers T0Core dimensions can be according to specific work(with material
Rate demand, signal frequency demand are suitably selected, and are silicon steel sheet, ferrite, permalloy, non-crystaline amorphous metal etc.；The n windings isolation
Transformer T0Per phase winding number of turn N1、N2、…、Nn-1、NnSelection can be according to specific experiment demand utilization design of transformer principle
Calculated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710666222.0A CN107272806A (en) | 2017-08-07 | 2017-08-07 | The high-power VCCS of multitube parallel coupled using isolating transformer |
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|---|---|---|---|
| CN201710666222.0A CN107272806A (en) | 2017-08-07 | 2017-08-07 | The high-power VCCS of multitube parallel coupled using isolating transformer |
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| US20080290730A1 (en) * | 2004-04-13 | 2008-11-27 | Koninklijke Philips Electronics, N.V. | Flyback Converter |
| CN101901670A (en) * | 2009-06-01 | 2010-12-01 | 奥斯兰姆有限公司 | High frequency mutual inductor and multiplexed output constant flow source with same |
| CN101951159A (en) * | 2010-09-20 | 2011-01-19 | 浙江大学 | Capacitor isolated type multipath constant current output resonant mode DC/DC transformer |
| CN102510225A (en) * | 2011-10-28 | 2012-06-20 | 广东电网公司广州供电局 | Method, device and experiment system for increasing output current of current rising device |
| CN105278599A (en) * | 2015-10-22 | 2016-01-27 | 国家电网公司 | Voltage-controlled current source circuit using CT to replace current sensing resistor |
| CN105429467A (en) * | 2015-11-04 | 2016-03-23 | 中国北方发动机研究所(天津) | Adjustable multi-output isolated voltage stabilizing power circuit |
| CN106849675A (en) * | 2017-03-28 | 2017-06-13 | 无锡芯朋微电子股份有限公司 | The control circuit and its method of Switching Power Supply |
-
2017
- 2017-08-07 CN CN201710666222.0A patent/CN107272806A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080290730A1 (en) * | 2004-04-13 | 2008-11-27 | Koninklijke Philips Electronics, N.V. | Flyback Converter |
| CN101034854A (en) * | 2006-03-08 | 2007-09-12 | 艾默生网络能源系统有限公司 | Voltage-adjustable multi-output power supply and method for adjusting output voltage thereof |
| CN101901670A (en) * | 2009-06-01 | 2010-12-01 | 奥斯兰姆有限公司 | High frequency mutual inductor and multiplexed output constant flow source with same |
| CN101951159A (en) * | 2010-09-20 | 2011-01-19 | 浙江大学 | Capacitor isolated type multipath constant current output resonant mode DC/DC transformer |
| CN102510225A (en) * | 2011-10-28 | 2012-06-20 | 广东电网公司广州供电局 | Method, device and experiment system for increasing output current of current rising device |
| CN105278599A (en) * | 2015-10-22 | 2016-01-27 | 国家电网公司 | Voltage-controlled current source circuit using CT to replace current sensing resistor |
| CN105429467A (en) * | 2015-11-04 | 2016-03-23 | 中国北方发动机研究所(天津) | Adjustable multi-output isolated voltage stabilizing power circuit |
| CN106849675A (en) * | 2017-03-28 | 2017-06-13 | 无锡芯朋微电子股份有限公司 | The control circuit and its method of Switching Power Supply |
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Application publication date: 20171020 |