CN106033224B - A kind of high current ac current source - Google Patents
A kind of high current ac current source Download PDFInfo
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- CN106033224B CN106033224B CN201510112925.XA CN201510112925A CN106033224B CN 106033224 B CN106033224 B CN 106033224B CN 201510112925 A CN201510112925 A CN 201510112925A CN 106033224 B CN106033224 B CN 106033224B
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Abstract
The present invention relates to a kind of high current ac current source, including magnetic circuit switching and current output circuit, 4 road SPWM inversions filter circuits, driving and alarm and protection circuit, loop control circuit, logic control circuit, interface display circuit.The present invention realizes that simply cost is relatively low；Current source output current wave is good, and total harmonic distortion is less than 2%；Output current scope is wide, 200A to 25000A；The output current response time is fast, and desired value can be reached in 5ms.
Description
Technical field
The present invention relates to a kind of high-current generation device, specifically a kind of electronic type quick response ac current source.
Background technology
At present, in the factory testing for needing the product for carrying out testing current, the quick response and wide scope in high current source
Output is always a very intractable problem in the industry.It especially requires output current bigger, is more difficult to reach quick response.It is main former
Because having：First, for the output equipment of low-voltage, high-current, rising current transformer is the link of a large time constant in equipment；2nd, quilt
The presence for surveying product individual difference introduces the randomness of load；3rd, based on cost consideration, user usually needs current supplying devices energy
There is wider output area, to adapt to different types of product.Three above reason causes the response time of current source general
Both greater than 500ms, for response time faster dedicated current source, output area is again narrow.Thus cause inspection
Resultant error is larger or testing cost is higher.
In theoretical field, classical control theory and modern control theory development are quite ripe.In terms of engineering technology,
The fast-ripenin of SPWM technologies makes quick adjust of voltage become to be more prone to.Output current control based on double-current ring has
The theoretical foundation and engineering foundation realized.In high precision, the transient current source of fast-response, which is realized, becomes possible.
Invention content
For electric current existing for existing power supply device can not quick response reach setting value and by load variation influenced not
Foot part, the present invention provide a kind of response speed of output current, current precision, wave distortion all reach good effect and
Not by the electronic type of network wave distortion effect exchange transient current source, and by the incision of multipath magnetic circuit current transformer magnetic circuit and cut
Go out to realize the electric current output of high-precision, wide scope.
The present invention adopts the following technical scheme that：
A kind of high current ac current source, including：Magnetic circuit switching and current output circuit, 4 road SPWM inversions filter circuits,
Driving and alarm and protection circuit, loop control circuit, logic control circuit, interface display circuit；
The driving and alarm and protection circuit and 4 road SPWM inversions filter circuits, magnetic circuit switching and current output circuit are suitable
Sequence connects, and loop control circuit is connect with driving and alarm and protection circuit, inverter circuit, current output circuit；The logic control
Circuit processed connects with driving and alarm and protection circuit, loop control circuit, interface display circuit, magnetic circuit switching and current output circuit
It connects.
Magnetic circuit switching and current output circuit include the A.C. contactor group being linked in sequence, multipath magnetic circuit rising current transformer, electricity
Flow sensor and voltage sensor；Four input terminals of the A.C. contactor group respectively with 4 road SPWM inversion filter circuits
The control output end of the connection of four output terminals, control terminal and logic control circuit connects, four output terminals respectively with multipath magnetic circuit liter
Four magnetic circuits connection of convertor transformer armature winding；The secondary windings output terminal series current sensing of multipath magnetic circuit rising current transformer
Device is parallel with voltage sensor；The current sensor is connect with loop control circuit；The voltage sensor and logic control
Circuit connects.
The 4 road SPWM inversions filter circuit includes 4 groups of H-bridge circuits, and each H bridges are made of four IGBT, IGBT's
Gate pole is all connect with driving with the output terminal of alarm and protection circuit, and the output terminal of H-bridge circuit is in series with electricity after differential mode inductance
Flow sensor is parallel with capacitance；The current sensor is connect with loop control circuit；The voltage output at the capacitance both ends is extremely
Magnetic circuit switching and current output circuit.
The present invention has the following advantages：
1. output current wave of the present invention is good, total harmonic distortion is less than 2%；
2. the output current response time is fast, desired value can be reached in 5ms, within precision 3%；
3. larger current value can be exported, highest 25000A；
4. in the case where ensureing precision, output area is wider, minimum output 200A；
5. circuit realizes that simply cost is relatively low；
6. principle is simple, device selection is more flexible, and commercialization is convenient.
Description of the drawings
Fig. 1 is electrical structure diagram of the present invention；
Fig. 2 is the structure chart of loop control circuit of the present invention；
Fig. 3 is the schematic diagram that signal of the present invention flows adjustment circuit；
Fig. 4 is the circuit diagram of PID adjusters of the present invention；
Fig. 5 is the circuit diagram that the present invention generates SPWM frequency multiplication driving pulses；
Fig. 6 is triangle wave generating circuit figure of the present invention；
Fig. 7 is the circuit diagram of the arbitrary filtering of SPWM inversions all the way in the present invention；
Fig. 8 is magnetic circuit switching and current output circuit figure in the present invention；
Wherein, 1, magnetic circuit switching and current output circuit, 2,4 road SPWM inversion filter circuits, 3, driving and alarm and protection
Circuit, 4, loop control circuit, 5, logic control circuit, 6, interface display circuit, 7, signal flow adjustment circuit, 8, PID tune
Whole device, 9, PWM frequency-doubled signal generative circuits, 10, triangular wave generating circuit.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
Hardware of the present invention is controlled using inside and outside double-current ring.Become using 4 road SPWM inverter voltages Parallel opertations to multipath magnetic circuit
Flow the former end of device.Equalizing control circuit is added to realize 4 magnetic circuit power-balances in inversion circuit control terminal.Add in shielding and switching electricity
Road realizes that 4 magnetic circuits can individually or be used in any combination.
The present invention includes magnetic circuit switching and current output circuit 1,4 road SPWM inversions filter circuits 2, driving and alarm and protection
Circuit 3, loop control circuit 4, logic control circuit 5, interface display circuit 6.
As shown in Figure 1, the logic control circuit 5 respectively with interface display circuit 6, loop control circuit 4, driving with
Alarm and protection circuit 3 connects, and is also connect with magnetic circuit switching and current output circuit 1；Loop control circuit 4 is protected with driving and alarm
Protection circuit 3 connects, and is also connect with inverter circuit and current output circuit；Driving and alarm and protection circuit and 4 road SPWM inversions are filtered
Wave circuit connects；4 road SPWM inversions filter circuits are connect with magnetic circuit switching and current output circuit.
Driving is used to generate the drive voltage signal of IGBT with alarm and protection circuit 3, and to the switch duration of drive signal
It is monitored, while monitors the overcurrent of IGBT and warm liter situation, signal is immediately turned off (as being more than threshold value) once noting abnormalities；
Its drive signal exported to 4 road SPWM inversions filter circuits 2 control IGBT to turn on and off；
4 road SPWM inversions filter circuits 2 are used for the DC inversion of busbar into adjustable alternating voltage, the alternating current of output
Signal is pressed to magnetic circuit switching and current output circuit 1.The electric current of its output is electric as 4 tunnel inner ring again by sensor sample simultaneously
Signal is flowed to loop control circuit 4 (four interior inner ring PID adjusters)；
Magnetic circuit switching and current output circuit 1 are by controlling the incision of internal transformer magnetic circuit to cut out, so as to fulfill equipment
Export the electric current of wide scope；It receives the control signal that the I/O ports of logic control circuit 5 provide, and exports outer shroud current signal
To loop control circuit 4, output voltage and current sampling signal to the AD conversion port of logic control circuit 5；
Logic control circuit 5 controls for the whole of this current supplying devices；Communication port output equipment parameter (equipment
Location, warning message, I/O states etc.) and operation data to interface display circuit 6, I/O ends output logic signal is to driving and alarm
Protect circuit 3, output reference signal to loop control circuit 4；
Loop control circuit 4 is used to carry out closed-loop control to output current；Output pulse signal extremely drives and alarm and protection
The incoming end of circuit.
Magnetic circuit switch and current output circuit 1 by A.C. contactor group, 4 magnetic circuit rising current transformers, large current sensor and
Voltage sensor forms.The circuit control controlled by logic of A.C. contactor group, completes the combination of the arbitrary magnetic circuit of transformer, 4 magnetic circuits
Rising current transformer pair end exports high current, and passes through sensor and signal is fed back to loop control circuit.
The every of 4 road SPWM inversions filter circuits 2 is the H-bridge circuit built using high-power IGBT all the way, and output is passed through
Differential mode inductance and capacitor filtering, and its output current is acquired by sensor and obtains internal current feedback signal.
Loop control circuit 4 is included at the outer ring PID adjusters, inner ring road PID adjusters, signal stream of serial connection
Manage adjustment circuit and SPWM frequency-doubled signal generative circuits；Outer ring PID adjusters connect the current sample letter of rising current transformer feedback
Number and logic control circuit reference signal, output connects and gives inner ring road PID adjusters；Inner ring road PID adjusters also access 4 tunnels
The current signal that SPWM inversions filter circuit 2 is fed back, is then output to and flows adjustment unit.
Logic control circuit 5 is by digital control chip FPGA, electrical level transferring chip composition；Interface and display circuit are by optocoupler
Isolating device, RS232 chips, touch screen composition.
As shown in Fig. 2, loop control circuit includes the outer shroud PID adjusters, inner ring PID adjusters, signal of serial connection
Flow adjustment circuit and PWM frequency-doubled signal generative circuits.The input termination logic control circuit 5 of wherein outer shroud PID adjusters is defeated
The current signal sampling that transformer exports in reference signal and the magnetic circuit switching gone out and current output circuit 1；Outer shroud PID adjusters
Output respectively with 4 road SPWM inversions filter circuits 2 output current sample as four pairs input be connected to 4 tunnel inner ring PID adjustment
The input terminal of device, the wherein output of outer shroud PID adjusters are used as with reference to being worth, and the electric current of 4 road SPWM inversions filter circuits 2 output is adopted
Sample is input to inner ring PID adjusters and carries out PID control respectively as 4 tunnel values of feedback；The output of 4 tunnel inner ring PID adjusters all connects
Enter signal and flow adjustment circuit；Final modulated signal accesses SPWM frequency-doubled signal generative circuits with high frequency triangle wave signal；So
Signal is eventually connected to driving and alarm and protection circuit 3 through dead zone adjustment and logic control circuit again afterwards.
As shown in figure 3, the 4 tunnel modulated signals that signal flows adjustment circuit are followed respectively by what 4 amplifier LT1216 were formed
Device accesses, and then obtains the temporal average of 4 road signals by 4 flows resistances respectively, then export by another follower.
As shown in figure 4, PID adjusters, by amplifier, resistance R6, R7 composition amplifying element, C1 is differential capacitance, and C2 is
Integrating capacitor forms basic PID and adjusts circuit.Input in figure is reference signal and the difference of feedback current.
As shown in figure 5, in PWM frequency-doubled signal generative circuits, by comparator LM211 to triangular wave and the modulating wave ratio of input
Compared with ultimately generating the square-wave signals (4 groups of SPWM signals) of change in duty cycle a series of.
As shown in fig. 6, the triangle wave generating circuit being made of two amplifier LT1216, potentiometer R19, R15 are respectively intended to
The amplitude and frequency of adjusting triangle wave.
As shown in fig. 7, inversion filter circuit is by 4 IGBT H bridge formed and 1 differential mode inductance L, 1 nothing all the way
Polar capacitor C is formed.DC voltage between DC+, DC- is obtained by 3 phase electric rectifications, normal about 540V.By this circuit by direct current
Electricity is reverse into required alternating voltage output.Internal current feedback letter is obtained by the output current of the sensor SQ1 H bridges acquired
Number.
As shown in figure 8, magnetic circuit switching and current output circuit include several A.C. contactors, 4 magnetic circuits flow up transformation
Device, a current sensor and a voltage sensor.A.C. contactor group realizes appointing for 4 magnetic circuits by the control of logic circuit
Meaning is applied in combination.By the current signal of sensor SQ2 acquisition rising current transformer outputs as outer shroud current signal.By sensor
The Voltage Feedback that SQ3 acquisition rising current transformers export gives logic circuit processing.
The operation principle of the present invention is as follows：Accurately sinusoidal reference amount is provided by DA by logic control circuit first,
It the feedback signal operation of reference quantity and magnetic circuit switching and current output circuit 1 and is adjusted in loop control circuit by PID, so
The 4 road signals difference operations with 4 road SPWM inversions filter circuits 2 feedback and PID are adjusted again afterwards, finally with standard triangular signal
Compare 4 groups of (16 tunnel) switching pulses of generation to driving and alarm and protection circuit 3.In order to ensure the balanced output of power, feeding back
Signal operation link adds signal and flows adjustment circuit.Power tube in final SPWM inversions filter circuit 2 is in switching pulse
The lower output high-tension pulse momentum of control, sinusoidal voltage is generated after LC is filtered, accesses more magnetic of magnetic circuit switching and current output circuit 1
Road rising current transformer original end.Above procedure is to realize the sine that the pulsed quantity of high voltagehigh frequency low current is become to low-voltage, high-current
Signal exports.Adjust the size of the i.e. changeable output current of quantity of given sinusoidal signal and control work magnetic circuit.
Claims (1)
1. a kind of high current ac current source, including：Magnetic circuit switching and current output circuit (1), 4 road SPWM inversion filter circuits
(2), driving and alarm and protection circuit (3), loop control circuit (4), logic control circuit (5), interface display circuit (6)；
The driving and alarm and protection circuit (3) and 4 road SPWM inversions filter circuits (2), magnetic circuit switching and current output circuit
(1) it is linked in sequence, loop control circuit (4) and driving and alarm and protection circuit (3), 4 road SPWM inversions filter circuits (2), magnetic
Road switching and current output circuit (1) connection；The logic control circuit (5) and driving and alarm and protection circuit (3), loop control
Circuit (4) processed, interface display circuit (6), magnetic circuit switching and current output circuit (1) connection；
Magnetic circuit switching and current output circuit (1) including be linked in sequence A.C. contactor group, multipath magnetic circuit rising current transformer, first
Current sensor and voltage sensor；Four input terminals of the A.C. contactor group respectively with 4 road SPWM inversion filter circuits
(2) four output terminals connection, control terminal connect with the control output end of logic control circuit (5), four output terminals respectively with
Four magnetic circuits connection of multipath magnetic circuit rising current transformer armature winding；The secondary windings output terminal series connection the of multipath magnetic circuit rising current transformer
One current sensor, is parallel with voltage sensor；First current sensor is connect with loop control circuit (4)；The electricity
Pressure sensor is connect with logic control circuit (5)；
The outer shroud PID adjusters, 4 tunnel inner ring PID adjusters, signal that loop control circuit includes serial connection flow adjustment circuit
And PWM frequency-doubled signal generative circuits；The reference letter that the input termination logic control circuit (5) of wherein outer shroud PID adjusters exports
Number and magnetic circuit switching and current output circuit (1) in transformer export current signal sampling；The output of outer shroud PID adjusters with
The current sample of 4 road SPWM inversions filter circuits (2) output inputs the input terminal for being connected to 4 tunnel inner ring PID adjusters as four pairs,
Wherein the output of outer shroud PID adjusters is used as with reference to being worth, and the current sample of 4 road SPWM inversions filter circuits (2) output is made respectively
For 4 tunnel values of feedback, it is input to 4 tunnel inner ring PID adjusters and carries out PID control；The output of 4 tunnel inner ring PID adjusters all accesses letter
Number flow adjustment circuit；Final modulated signal accesses PWM frequency-doubled signal generative circuits with high frequency triangle wave signal；Then it generates
Signal again through dead zone adjustment and logic control circuit be eventually connected to driving and alarm and protection circuit (3)；
The 4 road SPWM inversions filter circuit (2) includes 4 groups of H-bridge circuits, and each H bridges are made of four IGBT, the door of IGBT
Pole is all connect with driving with the output terminal of alarm and protection circuit (3), and the output terminal of H-bridge circuit is in series with the after differential mode inductance
Two current sensors, are parallel with capacitance；Second current sensor is connect with loop control circuit (4)；The electricity at the capacitance both ends
Pressure is exported to magnetic circuit switching and current output circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510112925.XA CN106033224B (en) | 2015-03-16 | 2015-03-16 | A kind of high current ac current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510112925.XA CN106033224B (en) | 2015-03-16 | 2015-03-16 | A kind of high current ac current source |
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| Publication Number | Publication Date |
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| CN106033224A CN106033224A (en) | 2016-10-19 |
| CN106033224B true CN106033224B (en) | 2018-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510112925.XA Active CN106033224B (en) | 2015-03-16 | 2015-03-16 | A kind of high current ac current source |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200986673Y (en) * | 2006-04-24 | 2007-12-05 | 李永高 | Electronic type current stabilizer |
| CN102520248A (en) * | 2011-12-05 | 2012-06-27 | 河南省电力公司南阳供电公司 | Insulation resistance and grounding resistance comprehensive tester based on programmable power supply |
| CN202374183U (en) * | 2011-12-26 | 2012-08-08 | 沈阳新松机器人自动化股份有限公司 | Electronic alternating-current instantaneous constant-current source |
| CN103812354A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Broadband strong current generator power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457493B (en) * | 2012-05-31 | 2016-08-03 | 台达电子工业股份有限公司 | Control device during a kind of power unit by-pass and control method |
-
2015
- 2015-03-16 CN CN201510112925.XA patent/CN106033224B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200986673Y (en) * | 2006-04-24 | 2007-12-05 | 李永高 | Electronic type current stabilizer |
| CN102520248A (en) * | 2011-12-05 | 2012-06-27 | 河南省电力公司南阳供电公司 | Insulation resistance and grounding resistance comprehensive tester based on programmable power supply |
| CN202374183U (en) * | 2011-12-26 | 2012-08-08 | 沈阳新松机器人自动化股份有限公司 | Electronic alternating-current instantaneous constant-current source |
| CN103812354A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Broadband strong current generator power supply |
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| Publication number | Publication date |
|---|---|
| CN106033224A (en) | 2016-10-19 |
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Effective date of registration: 20200108 Address after: 214101 No.79, Gaodeng Road, Xishan Economic and Technological Development Zone, Wuxi City, Jiangsu Province Patentee after: Wuxi Xinsong Robot Automation Co., Ltd Address before: Hunnan New District Jinhui street in Shenyang of Liaoning province 110168 City No. 16 Patentee before: Shenyang Xinsong Robert Automation Co., Ltd. |