CN206332625U - The electrical level inverter of three-phase seven for experimental teaching - Google Patents
The electrical level inverter of three-phase seven for experimental teaching Download PDFInfo
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- CN206332625U CN206332625U CN201621342253.8U CN201621342253U CN206332625U CN 206332625 U CN206332625 U CN 206332625U CN 201621342253 U CN201621342253 U CN 201621342253U CN 206332625 U CN206332625 U CN 206332625U
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Abstract
The utility model discloses the electrical level inverter of three-phase seven for experimental teaching, including processor unit, programming unit, power supply unit and sampling unit；Processor unit is digital signal processor；Programming unit includes field programmable gate array and cd-rom recorder, and programmable gate array is connected with digital signal processor, and cd-rom recorder is connected with programmable gate array；Power supply unit includes isolating transformer and power cell, and isolating transformer includes input voltage and three road output voltages all the way, and isolating transformer and power cell are connected with field programmable gate array；Sampling unit includes voltage sampling unit and current sampling unit, and voltage sampling unit and current sampling unit are connected with processor unit.Relative to the high-power inverter of traditional industry, the small-power of the utility model design is used for the electrical level inverter of three-phase seven of experimental teaching, need not be using expensive phase-shifting transformer, only transformer need to be only isolated using number, can be widely applied to religion instrument equipment etc. field, with cheap, dependable performance, be adapted to demonstration the features such as.
Description
Technical field
The utility model is related to inverter field, more particularly to a kind of electrical level inverter of three-phase seven for experimental teaching.
Background technology
Multi-electrical level inverter technology is that one kind realizes that high-power is exported by improving inverter itself topological structure
Novel inverter, its major advantage includes：Step waveform is presented in output voltage, and output harmonic wave and dv/dt are small；Individual devices
It is resistance to force down；Suitable for high pressure occasion etc..It is different according to topological structure, it can substantially be divided into many level of diode clamp, fly across electricity
Hold many level, cascading multiple electrical level and hybrid many level.
Because cascade multilevel inverter is that each unit is only using common single-phase H bridge inverters as elementary cell
Vertical power supply, electrical characteristic is reliable, is the first choice topology of Product-level multi-electrical level inverter.
In industrial high-power applications, the power factor (PF) for guarantee input side meets grid requirements with harmonic wave, usually used
Phase-shifting transformer provides independent power supply for single elementary cell.But this kind of product, in small-powers such as common teaching, demonstrations
During application scenarios, price will show that costly cost is higher.
Utility model content
According to one side of the present utility model, around religion instrument equipment requirement is cheap, dependable performance, it is adapted to demonstration etc.
Feature is there is provided a kind of electrical level inverter of three-phase seven for experimental teaching for being mainly used in teaching demonstration equipment, and it includes place
Manage device unit, programming unit, power supply unit and sampling unit；
Processor unit is digital signal processor (DSP, DigitalSignalProcessor)；
Programming unit includes field programmable gate array and cd-rom recorder, and programmable gate array is connected with digital signal processor
Logical, cd-rom recorder is connected with programmable gate array；
Power supply unit includes isolating transformer and power cell, and isolating transformer includes input voltage all the way and the output of three tunnels
Voltage, isolating transformer and power cell are connected with field programmable gate array；
Sampling unit includes voltage sampling unit and current sampling unit, voltage sampling unit and current sampling unit with
Processor unit is connected.
Its advantage is that processor unit is mainly used in completing V/F or vector motor control algorithms.V/F controls are main
Including the generation of V/F curves, low-frequency torque lifting and SPWM modulation etc.；Vector controlled mainly include ID, IQ closed-loop current control,
Based on encoder position, the position of velocity feedback, velocity close-loop control and CLARK and PARK conversion (inverse transformation) scheduling algorithms.
Simultaneously as in the level of cascade connection type seven, each elementary cell has 4 power tubes, three-phase needs 36 power altogether
Pipe.Upper down tube in view of each bridge arm drives complementation.System will at least export the driving of 18 tunnels.It is therefore desirable to using programmable
Gate array extends output.Real-time on-line simulation device be used for digital signal processor carry out real-time simulation, cd-rom recorder be used for pair
Programmable gate array is programmed.
In some embodiments, power cell includes rectification circuit, dc bus filter circuit, dc bus charging electricity
Road, H-bridge inverter circuit, H-bridge drive circuit, auxiliary switching power supply and failure detector circuit.
Its advantage is that rectification circuit is used to connect isolating transformer, and dc bus is provided using single-phase bridge rectification
Voltage.Dc bus filter circuit is used for smooth commutating voltage.Limitation is to bus electricity when dc bus charging circuit is used to be powered
Capacity charge electric current, it is to avoid to the rush of current of transformer, it is general by the way of current-limiting resistance adds bypass relay, because our
The busbar voltage of case is relatively low, for reduction low cost NTC power resistors can also be used to replace.H-bridge inverter circuit, for by direct current
Electricity is reverse into alternating current.H-bridge drive circuit is used to receive the pwm signal exported by programmable gate array.Auxiliary switching power supply is used
In the power supply for controlling whole power cell.Failure detector circuit is used to constitute bridge arm direct pass protection, and dc bus under-voltage protection dissipates
Hot device overtemperature prote etc..
In some embodiments, voltage sampling unit is high-speed linear optocoupler.Its advantage is, high-speed linear optocoupler
Current transmission characteristic curve close to straight line, and better performances during small-signal can carry out isolation control, simultaneously with linear characteristic
Relative to traditional Hall voltage sensor, cheaper, cost is lower.
In some embodiments, current sampling unit is two-way open loop Hall current sensor.Its advantage is, suddenly
The response time of your current sensor is fast, Low Drift Temperature, high precision, small volume, bandwidth, strong antijamming capability, overload capacity are strong.
In some embodiments, also including human-computer interaction device, human-computer interaction device includes liquid crystal display and button.It has
Beneficial effect is to pass through the display and the operation of button of liquid crystal display, in that context it may be convenient to the work(for the operation demonstration such as imparted knowledge to students, tested
Energy.
In some embodiments, also including main switch power supply, main switch power configuration is into control for experimental teaching
The work of the electrical level inverter of three-phase seven.
In some embodiments, also including communication interface, communication interface is RS485 interfaces.Its advantage is to pass through
Communication interface easily can be connected with outside PLC, conveniently enter row data communication.The signal level of RS485 interfaces is relatively low,
The chip of interface circuit is hardly damaged, and the level is compatible with Transistor-Transistor Logic level, can facilitate and is connected with TTL circuits, its data highest is passed
Defeated speed can reach 10Mbps.Anti- common mode does ability by force, and noise immunity is good.
In some embodiments, also including real-time on-line simulation device, the real-time on-line simulation device and processor unit
It is connected.
Relative to the high-power inverter of traditional industry, the small-power of the utility model design is used for the three of experimental teaching
The electrical level inverter of phase seven, without that using expensive phase-shifting transformer, only need to only isolate transformer using number, can answer extensively
For teaching instrument equipment to treat field, with cheap, dependable performance, be adapted to demonstration the features such as.
Brief description of the drawings
Fig. 1 is the structural principle of the electrical level inverter of three-phase seven for experimental teaching of the embodiment of the utility model one
Figure；
Fig. 2 is electric for the auxiliary switch of the electrical level inverter of three-phase seven for experimental teaching of the embodiment of the utility model one
Source part circuit structure figure；
Fig. 3 is electric for the fault detect of the electrical level inverter of three-phase seven for experimental teaching of the embodiment of the utility model one
The under-voltage protection part circuit structure figure on road；
Fig. 4 is electric for the fault detect of the electrical level inverter of three-phase seven for experimental teaching of the embodiment of the utility model one
The overtemperature prote part circuit structure figure on road.
Embodiment
1-4 is described in further detail to the utility model below in conjunction with the accompanying drawings.
Fig. 1 to Fig. 4, schematically shows three for experimental teaching according to a kind of embodiment of the present utility model
The electrical level inverter of phase seven.As shown in figure 1, a kind of level of three-phase seven for experimental teaching for being mainly used in teaching demonstration equipment is inverse
Become device, it includes processor unit 1, programming unit, power supply unit and sampling unit.
Processor unit 1 is digital signal processor (DSP, DigitalSignalProcessor), and DSP can be used
TMS320F2812, highest dominant frequency 150MHz.TMS320F2812 kernel is 32, and the PWM outputs with 6 tunnel independences, 16 lead to
The AD inputs of 12, road and 36KRAM and 256KFlash memories.
Programming unit includes field programmable gate array 21 and cd-rom recorder 23, programmable gate array 21 and Digital Signal Processing
Device is connected, and cd-rom recorder 23 is connected with programmable gate array 21；Field programmable gate array 21 can be used
EP1C3T144C8N or EP1C3T100C8N, cd-rom recorder 23 can use ALTERA USB BLASTER.
Power supply unit includes isolating transformer 31 and power cell 32, and isolating transformer 31 includes input voltage and three all the way
Road output voltage.In the present embodiment, isolating transformer 31 turns 3 road AC80V, totally three for AC230V all the way；It is each that there are 3 pairs of phases
Mutual independent isolation and amplifier.Each phase of inverter uses a transformer as isolation power supply, and every group of insulating power supply is whole
It is 110Vdc or so after stream, has 330Vdc after three groups of power supply superpositions, 230Vac can be exported after inversion, while leaving certain mother
Line voltage.Surplus isolating transformer 31 and power cell 32 are connected with field programmable gate array 21.
Sampling unit includes voltage sampling unit 41 and current sampling unit 42, voltage sampling unit 41 and current sample list
Member 42 is connected with processor unit 1.In order to reduce in cost, the present embodiment, voltage sampling unit 41 uses high-speed linear
Optocoupler HCPL-7840 makees high-low pressure isolation sampling, and input and output ratio is designed as：100:1.Current sampling unit 42 uses two-way
Open loop Hall current sensor, detects U, V biphase current respectively, and current sensor use ± 15V powers, and input ± 5A correspondences are defeated
Go out ± 4V, DSP AD ports are transferred back into 0-3.3V with level translation circuit conversion in the proportional zoom Jing Guo amplifier.
Wherein, processor unit 1 is mainly used in completing V/F or vector motor control algorithms.V/F controls mainly include V/F
Curve is generated, low-frequency torque lifting and SPWM modulation etc.；Vector controlled mainly includes ID, IQ closed-loop current control, based on volume
Code device position, the position of velocity feedback, velocity close-loop control and CLARK and PARK conversion inverse transformation scheduling algorithms.
Simultaneously as in the level of cascade connection type seven, each elementary cell has 4 power tubes, three-phase needs 36 power altogether
Pipe.Upper down tube in view of each bridge arm drives complementation.System will at least export the driving of 18 tunnels.It is therefore desirable to using programmable
Gate array 21 extends output, while programmable gate array 21 can also handle the failure feedback of elementary cell.Real-time on-line simulation
Device 22 is used to carry out digital signal processor real-time simulation, and cd-rom recorder 23 is used to be programmed programmable gate array 21.
The power cell 32 of the present embodiment includes rectification circuit 321, dc bus filter circuit 323, dc bus charging
Circuit 323, H-bridge inverter circuit 324, H-bridge drive circuit 325, auxiliary switching power supply 326 and failure detector circuit 327.
Wherein, rectification circuit 321 is used to connect isolating transformer 31, and dc bus electricity is provided using single-phase bridge rectification
Pressure, can be using a KBU1508 rectifier bridge.Dc bus filter circuit 323 is used for smooth commutating voltage, can use one
330UF400Vdc electrochemical capacitor.Limitation is kept away bus capacitor charging current when dc bus charging circuit 323 is used to be powered
Exempt from the rush of current to transformer, it is general by the way of current-limiting resistance adds bypass relay, because the busbar voltage of this programme
It is relatively low, for reduction low cost NTC power resistors can also be used to replace.H-bridge inverter circuit 324, for by DC inverter into
Alternating current, can use 4 discrete metal-oxide-semiconductors, model IRF840, pressure-resistant 500V, electric current 8A；Dissipated with rectifier bridge installed in same
On hot device.H-bridge drive circuit 325 is used to receive the pwm signal exported by programmable gate array 21, can use two-way high-speed light
Coupling HCPL-2631 isolates, and in the dead zone generation circuit by being made up of NAND gate, is input to metal-oxide-semiconductor driving chip, driving chip
Using 2 FAN7384, this chip contains bridge arm direct pass defencive function.Auxiliary switching power supply 326 is used to control whole power cell
32 power supply, can use monolithically integrated switching power supply chip VERP23A, can export 10W power, primary side is directly from direct current
Power taking on bus capacitor, secondary output two groups of power supplys of 5V, 15V.Failure detector circuit 327 is used to constitute bridge arm direct pass protection, directly
Flow bus under-voltage protection, radiator overtemperature prote etc..
Meanwhile, the utility model also includes human-computer interaction device 5, and human-computer interaction device 5 includes liquid crystal display and button.Pass through
The display of liquid crystal display and the operation of button, in that context it may be convenient to the function for the operation demonstration such as imparted knowledge to students, tested, it is possible to for adjusting
Try DSP inner parameters and check built-in variable.Internal debugging parameter includes V/F parameters of curve reference voltage, reference frequency, vector
Control parameter speed ring and electric current loop ratio, integral parameter, parameter of electric machine Rated motor parameter and fixed rotor resistance, inductance,
Mutual inductance, along with Acceleration and deceleration time parameter of curve etc..
Also include main switch power supply and communication interface 6, wherein, main switch power configuration is used for the three of experimental teaching into control
The work of the electrical level inverter of phase seven, mainly to digital signal processor, programmable gate array 21, human-computer interaction device 5, sampling
The circuits such as unit provide power supply, can be using monolithically integrated switching power supply chip VERP23A from civil power 230V power takings, and secondary is exported
5V, ± 15V, 24V.Communication interface 6 is RS485 interfaces.Easily it can be connected by communication interface 6 with outside PLC, side
Just row data communication is entered.The signal level of RS485 interfaces is relatively low, is hardly damaged the chip of interface circuit, and the level and TTL electricity
Flat compatibility, can facilitate and be connected with TTL circuits, its data maximum transmission rate can reach 10Mbps.Anti- common mode does ability by force,
Noise immunity is good.The utility model also includes real-time on-line simulation device 22, and real-time on-line simulation device 22 can be used and used
XDS100V2 emulators.
The above is only some embodiments of the present utility model.For the person of ordinary skill of the art, not
On the premise of departing from the utility model creation design, various modifications and improvements can be made, these belong to the utility model
Protection domain.
Claims (7)
1. the electrical level inverter of three-phase seven for experimental teaching, it is characterised in that including processor unit (1), programming unit, confession
Electric unit and sampling unit；
The processor unit (1) is digital signal processor；
The programming unit includes field programmable gate array (21) and cd-rom recorder (23), the programmable gate array (21) and institute
State digital signal processor to be connected, the cd-rom recorder (23) is connected with the programmable gate array (21)；
Said supply unit includes isolating transformer (31) and power cell (32), and the isolating transformer (31) includes defeated all the way
Enter voltage and three road output voltages, the isolating transformer (31) and power cell (32) with the field programmable gate array
(21) it is connected；
The sampling unit include voltage sampling unit (41) and current sampling unit (42), the voltage sampling unit (41) and
Current sampling unit (42) is connected with the processor unit (1).
2. three-phase seven electrical level inverter according to claim 1 for experimental teaching, it is characterised in that the power list
First (32) include rectification circuit (321), dc bus filter circuit (323), dc bus charging circuit (323), H bridges inversion electricity
Road (324), H-bridge drive circuit (325), auxiliary switching power supply (326) and failure detector circuit (327).
3. three-phase seven electrical level inverter according to claim 1 for experimental teaching, it is characterised in that the voltage is adopted
Sample unit (41) is high-speed linear optocoupler.
4. three-phase seven electrical level inverter according to claim 1 for experimental teaching, it is characterised in that the electric current is adopted
Sample unit (42) is two-way open loop Hall current sensor.
5. three-phase seven electrical level inverter according to claim 1 for experimental teaching, it is characterised in that also including man-machine
Interactive device (5), the human-computer interaction device (5) includes liquid crystal display and button.
6. three-phase seven electrical level inverter according to claim 1 for experimental teaching, it is characterised in that also including communication
Interface (6), the communication interface (6) is RS485 interfaces.
7. three-phase seven electrical level inverter according to claim 1 for experimental teaching, it is characterised in that also including real-time
In-circuit emulator (22), the real-time on-line simulation device (22) is connected with the processor unit (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621342253.8U CN206332625U (en) | 2016-12-08 | 2016-12-08 | The electrical level inverter of three-phase seven for experimental teaching |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621342253.8U CN206332625U (en) | 2016-12-08 | 2016-12-08 | The electrical level inverter of three-phase seven for experimental teaching |
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| CN206332625U true CN206332625U (en) | 2017-07-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655847A (en) * | 2016-12-08 | 2017-05-10 | 杭州恒瑞教学设备有限公司 | Three-phase seven-level inverter used for experiment teaching |
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2016
- 2016-12-08 CN CN201621342253.8U patent/CN206332625U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655847A (en) * | 2016-12-08 | 2017-05-10 | 杭州恒瑞教学设备有限公司 | Three-phase seven-level inverter used for experiment teaching |
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