CN206523614U - A kind of energy consumption type alternating current electronic load - Google Patents
A kind of energy consumption type alternating current electronic load Download PDFInfo
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- CN206523614U CN206523614U CN201720036629.0U CN201720036629U CN206523614U CN 206523614 U CN206523614 U CN 206523614U CN 201720036629 U CN201720036629 U CN 201720036629U CN 206523614 U CN206523614 U CN 206523614U
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Abstract
The utility model belongs to power electronic equipment field, and in particular to a kind of energy consumption type alternating current electronic load, including A.C. contactor, exchange input filter inductance, inverter bridge, DC bus capacitor, copped wave module, energy consumption resistance, detection module and control module；A.C. contactor, exchange input filter inductance, the first end of inverter bridge and the second end and tested electric power generating composition loop；3rd end of inverter bridge and the 4th end constitute loop with DC bus capacitor, and copped wave module and energy consumption resistance are connected on the two ends of DC bus capacitor；Control module is connected with inverter bridge and copped wave module, and the conducting and shut-off of inverter bridge and copped wave module are accordingly controlled according to the voltage and current value and the parameter of setting that measure, so as to the tested mains input current realized and any setting of power factor, and stability contorting DC capacitor voltage, consume excess energy simultaneously, electronic load circuit is simple in construction, and cost is low.
Description
Technical field
The utility model belongs to power electronic equipment field, and in particular to a kind of energy consumption type alternating current electronic load.
Background technology
With the development of Power Electronic Technique, power electronics power supply is widely applied, and to the test of power electronics power supply
Propose higher and more accurate requirement.Traditional power supply test typically using fixed resistance inductive load, its power factor and
Output current can not typically accomplish any setting, it is impossible to adapt to the accurate test of power supply.
Most of existing electronic load uses grid-connected energy feedback type structure, and the advantage of which is can to save energy
Source, but in some remote areas or special occasions, because no power network or power network do not allow energy feedback, the type electronics
Load can not be used.
Energy consumption type alternating current electronic load is typically using back type converters are leaned against, and connection is tested the conversion of mains side
Device is generally required carries out tested electricity using the double -loop control mode of DC bus-bar voltage outer shroud and ac filter inductive current inner ring
Source output current tracing control, the controller design of the control mode is complicated and system is not easy stabilization.Also some types are electric
Son load is used by controlling multiple power devices (such as transistor or MOSFET) in parallel to be operated in linear amplification region
Power consumption carry out consumed energy, although the type electronics can make energy consumption type load, by the power consumption of its single power device
It is limited, and need more complicated and various drive circuit, it is not easy to make powerful electronic load and system complex cost
Higher, the electronic load of the type also has fatal defect to be that can only adjust the size of load current in addition, and can not adjust negative
Current-carrying power factor.
As how low-cost design one kind is simple in construction, system is stable, powerful energy consumption type alternating current electronic load comes real
The accurate simulation and control of existing load current size and power factor are the problems to be solved at present.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the utility model is negative there is provided a kind of energy consumption type alternating electron
Carry, a kind of simple in construction, system is devised by using components such as inverter bridge, DC bus capacitor, copped wave module and energy consumption resistances
Stable high-power energy consumption type alternating current electronic load, realizes any adjustable of tested source current and power factor.
To achieve the above object, connect according to the utility model there is provided a kind of energy consumption type alternating current electronic load, including exchange
Tentaculum, exchange input filter inductance, inverter bridge, DC bus capacitor, copped wave module, energy consumption resistance, detection module and control module；
The first end of A.C. contactor is used as the interface being connected with the tested pole of power supply one, and the second end of A.C. contactor is with handing over
The first end connection of input filter inductance is flowed, the second end of input filter inductance is exchanged and the first end of inverter bridge is connected, inversion
Second end of bridge is used as the interface being connected with another pole of tested power supply；
Inverter bridge is in parallel with DC bus capacitor by the end of inverter bridge the 3rd and the 4th end, copped wave module and energy consumption resistance series connection
It is in parallel with DC bus capacitor afterwards；
Detection module first end is used as the interface being connected with tested power supply, the voltage for detecting tested power supply；Detect mould
The end of block second with exchange input filter inductance connection be used for detect exchange input filter inductance voltage；The end of detection module the 3rd with
DC bus capacitor is connected to detect the voltage of DC bus capacitor；The end of detection module the 4th is connected to control module first end
The voltage of the tested power supply detected is transmitted, the end of detection module the 5th is connected to transmit what is detected with the end of control module second
The electric current of input filter inductance is exchanged, the end of detection module the 6th is used to transmit the direct current detected with control module three-terminal link
The voltage of lateral capacitance；
Control module first end is connected with the end of detection module the 4th, the voltage for receiving the tested power supply detected；Control
The end of molding block second is connected with the end of detection module the 5th, the electric current of the exchange input filter inductance detected for receiving；Control
The end of module the 3rd and detection module six end connecting, the voltage for receiving the DC bus capacitor detected；Control module the 4th
End is connected with inverter bridge, conducting and shut-off for controlling inverter bridge；The end of control module the 5th is connected with copped wave module, for controlling
The conducting and shut-off of copped wave module processed.
Based on said structure, control module is according to the voltage and the electricity for exchanging input filter inductance of the tested power supply received
Stream and the current characteristic curve of setting generation control instruction, control the conducting and shut-off of inverter bridge, realize load current big
The accurate simulation and control of small and power factor；Control module is straight according to the voltage of the DC bus capacitor received and setting
The voltage max and minimum value generation control instruction of lateral capacitance are flowed, the conducting and shut-off of copped wave module is controlled, makes energy consumption resistance
Keep connecting or disconnecting with DC bus capacitor, it is achieved thereby that power consumption electric discharge, stable DC lateral capacitance voltage and protection DC side
Electric capacity.
Preferably, detection module includes tested electric power output voltage detection unit, the inductive current detection of exchange input filter
Unit and DC capacitor voltage detection unit；Tested electric power output voltage detection unit first end is used as detection module first
End, is tested the second end of electric power output voltage detection unit and is used as the end of detection module the 4th；Exchange the detection of input filter inductive current
Unit first end is used as the end of detection module second, and exchange input filter inductive current detection unit the second end is used as detection module the
Five ends；DC capacitor voltage detection unit first end is used as the end of detection module the 3rd, DC capacitor voltage detection unit the
Two ends are used as the end of detection module the 6th.
Preferably, control module includes digital signal processing unit and driving and the protection circuit being connected with each other；Numeral letter
Number processing unit first end is used as control module first end, and the end of digital signal processing unit second is used as the end of control module second,
The end of digital signal processing unit the 3rd is used as the end of control module the 3rd；Driving is used as control module the 4th with protection circuit first end
End, driving is used as the end of control module the 5th with the end of protection circuit second.
Preferably, control module also includes a man-machine interaction unit being connected with digital signal processing unit.
Preferably, control module is first according to the voltage U1 of the tested power supply received and the current characteristic curve I0 of setting
Calculated according to public formula (I) and obtain load current instruction Ir：Ir=I0 × U1 ÷ 220 (I), the load electricity then obtained according to calculating
Stream instruction Ir is calculated according to public formula (II) with the electric current If for exchanging input filter inductance and is obtained current error e：E=Ir-If (I),
Calculated finally according to current error e and obtain driving instruction Ui, so as to control the conducting and shut-off of inverter bridge.
Preferably, control module is according to the voltage Uf of the DC bus capacitor received and the electricity of the DC bus capacitor of setting
Maximum Umax and minimum value Umin is pressed, is worked according to (III) and public formula (IV)：
As Uf >=Umax, S=1 (I)；
As Uf ＜ Umin, S=0 (II)；
Wherein, the maximum Umax and minimum value Umin of DC capacitor voltage are determined by public formula (V) and public formula (VI)：
Umin=U × 1.2 (V), Umax=U × 1.25 (VI), wherein, U is the peak value of tested electric power output voltage；
As S=1, control module control copped wave module conducting makes energy consumption resistance be connected with DC bus capacitor, realizes power consumption
Discharge and maintain DC capacitor voltage to be no more than Umax, as S=0, control copped wave module shut-off makes energy consumption module and direct current
Lateral capacitance disconnects, and maintains DC capacitor voltage to be more than Umin.
Preferably, digital signal processing unit includes hystersis controller, and the load current being sequentially connected instructs to form list
Member, subtracter and current controller；The first input end of hystersis controller be used as the end of control module the 3rd, hystersis controller it is defeated
Go out end connection driving and protection circuit；Load current instructs the first input end to form unit to be used as control module first end；Subtract
Multiplier input terminal is used as the end of control module second；The output end connection driving of current controller and protection circuit；Hystersis controller
The second input instruct the second input to form unit to be connected man-machine interaction unit with load current.
Preferably, electronic load also includes pre-charge circuit, and pre-charge circuit is by the charging for connecting charging circuit
Tentaculum and charging resistor are in series, and pre-charge circuit is in parallel with A.C. contactor.It is electric in pre-charge circuit, prevention by designing
When produce excessive electric current, damage inverter bridge and DC bus capacitor.
Preferably, the rated operational voltage Uc of DC bus capacitor meets following condition：Uc >=U × 1.5, wherein, U is tested
The peak value of electric power output voltage.Thereby guarantee that the safety of DC bus capacitor.
Preferably, current controller uses PI, PR or PID controller.
Preferably, inverter bridge is three phase inverter bridge or half-bridge converter.
AC electric source testing is carried out using above-mentioned electronic load there is provided one kind according to other side of the present utility model
Realize that input current and power factor arbitrarily set the method for work of simultaneously accurate tracking, comprise the following steps：
(1) setting needs the load current characteristic curve I0 for the information containing power factor simulated；
(2) electronic load is started, according to the voltage U1 of the tested power supply measured and the load current characteristic curve I0 of setting
Calculated by public formula (I) and obtain load current instruction Ir：Ir=I0 × U1 ÷ 220 (I)；
(3) the Ir and electric current If for exchanging input filter inductance measured is instructed according to load current, calculated by public formula (II)
Obtain current error e：E=Ir-If (II)；
(4) calculated according to current error e and obtain driving instruction Ui, realize the conducting and shut-off of inverter bridge；Thus mode, real
The accurate simulation and control of load current size and power factor are showed；
AC electric source testing is carried out using above-mentioned electronic load there is provided one kind according to other side of the present utility model
The method of work of Shi Shixian energy expenditures and stable DC lateral capacitance, comprises the following steps：
(a) before electronic load startup, the maximum Umax and minimum value Umin of DC capacitor voltage, DC side are set
The maximum Umax and minimum value Umin of capacitance voltage are determined by public formula (V) and public formula (VI)：Umin=U × 1.2 (V),
Umax=U × 1.25 (VI), wherein, U is the peak value of tested electric power output voltage；
(b) after electronic load startup, according to the voltage Uf of the DC bus capacitor measured and the DC bus capacitor of setting electricity
The maximum Umax and minimum value Umin of pressure, are judged according to public formula (III) and public formula (IV)：As Uf >=Umax, S=1
(III), as Uf ＜ Umin, S=0 (IV)；
(c) as S=1, control copped wave module conducting makes energy consumption resistance be connected with DC bus capacitor, realizes power consumption electric discharge
And maintain DC capacitor voltage to be no more than Umax, as S=0, control copped wave module shut-off makes energy consumption module and DC side electricity
Hold and disconnect, maintain DC capacitor voltage to be not less than Umin；Thus mode, by controlling the conducting and shut-off of copped wave module, directly
The operating voltage of stream lateral capacitance is maintained in certain scope, while ensure that the normal work and DC bus capacitor of inverter bridge
Safe operation, and simultaneously accomplished using energy consumption resistance consume energy purpose.
In general, by the contemplated above technical scheme of the utility model compared with prior art, can obtain with
Lower beneficial effect：
(1) use electronic load of the present utility model, not only can arbitrarily set tested mains input current and power because
Number, and do not allowing the special occasions of energy feedback can normally run the electronic load without power network or power network yet.
(2) by using copped wave module and energy consumption resistance, electronic load of the present utility model is accomplishing stable DC side electricity
Excess energy is consumed while holding voltage, not only circuit structure is simple, and simplify tested electric power outputting current tracking control
Device processed design, cost is low, and overcoming conditional electronic and being supported on can not use and the high shortcoming of the complicated cost of circuit under special occasions.
Brief description of the drawings
Fig. 1 is structural representation when a kind of energy consumption type alternating current electronic load connection of the utility model is tested power supply.
Fig. 2 is the tested electric power outputting current tracing control block diagram according to the utility model electronic load.
Fig. 3 is to realize to consume energy and DC bus capacitor using copped wave module and energy consumption resistor according to the utility model electronic load
The control block diagram of voltage stabilization effect.
In all of the figs, identical reference is used for representing identical element or structure, wherein：
1- is tested power supply, 2- exchange main contactors 2 (2), 3- exchange input filter inductance, 4- inverter bridges, 5- DC sides electricity
Hold, 6- copped wave modules, 7- energy consumption resistances, 8- detection modules, 9- control modules, 81- is tested electric power output voltage detection unit,
82- exchanges input filter inductive current detection unit, 83- DC capacitor voltage detection units, 91- Digital Signal Processing lists
Member, 92- drivings and protection circuit, 93- man-machine interaction units, 911- load currents instruct to form unit, 912- subtracters, 913-
Current controller, 914- hystersis controllers.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.In addition, institute in each embodiment of the utility model disclosed below
As long as the technical characteristic being related to does not constitute conflict and can be just mutually combined each other.
Embodiment
As shown in figure 1, a kind of energy consumption type alternating current electronic load include A.C. contactor 2, it is exchange input filter inductance 3, inverse
Become bridge 4, DC bus capacitor 5, copped wave module 6, energy consumption resistance 7, detection module 8 and control module 9；The first of A.C. contactor 2
End is used as the interface being connected with the tested pole of power supply 1 one, and the second end of A.C. contactor 2 is with exchanging the first of input filter inductance 3
End connection, the second end of exchange input filter inductance 3 is connected with the first end of inverter bridge 4, and the second end of inverter bridge 4 is used as and quilt
Survey the interface of another pole of power supply 1 connection；Inverter bridge 4 is in parallel with DC bus capacitor 5 by the 3rd end of inverter bridge 4 and the 4th end,
Copped wave module 6 and energy consumption resistance 7 are in parallel with DC bus capacitor 5 after connecting；
Detection module 8 includes tested electric power output voltage detection unit 81, exchange input filter inductive current detection unit
82 and DC capacitor voltage detection unit 83；The tested first end of electric power output voltage detection unit 81 is used as and tested power supply 1
The interface of connection, the voltage for detecting tested power supply 1 is tested the end of electric power output voltage detection unit 81 second and control module
9 first ends are connected to transmit the voltage of the tested power supply 1 detected；Exchange input filter inductive current detection unit 82 first
The electric current that detection exchange input filter inductance 3 is connected to exchanging input filter inductance 3 is held, input filter inductive current is exchanged
The end of detection unit 82 second is connected to transmit the electric current for exchanging input filter inductance 3 detected with the end of control module 9 second；
The first end of DC capacitor voltage detection unit 83 is connected to detect the voltage of DC bus capacitor 5, direct current with DC bus capacitor 5
The end of lateral capacitance voltage detection unit 83 second is used to transmit the DC bus capacitor 5 detected with the three-terminal link of control module 9
Voltage；
Control module 9 includes digital signal processing unit 91, driving and protection circuit 92 and man-machine interaction unit 93；Numeral
Signal processing unit 91 includes hystersis controller 914, and the load current being sequentially connected instructs to form unit 911, subtracter 912
With current controller 913；The first input end of hystersis controller 914 is used as the end of control module 9 the 3rd, hystersis controller 914
Output end connection driving and protection circuit 92；Load current instructs the first input end to form unit 911 to be used as control module 9 the
One end；The input of subtracter 912 is used as the end of control module 9 second；The output end connection driving of current controller 913 and protection electricity
Road 92；The second input and the load current of hystersis controller 914 instruct the second input to form unit 911 to be connected man-machine friendship
Mutual unit 93；Driving is connected with the first end of protection circuit 92 with inverter bridge 4, for the tested electricity received according to control module 9
The voltage in source 1 generates control instruction with the current characteristic curve for the electric current and setting for exchanging input filter inductance 3, controls inversion
The conducting and shut-off of bridge 4；Driving is connected with the end of protection circuit 92 second with copped wave module 6, for being received according to control module 9
DC bus capacitor 5 voltage and setting DC bus capacitor 5 voltage max and minimum value generation control instruction, control
The conducting and shut-off of copped wave module 6, realize power consumption electric discharge and protection DC bus capacitor 5.
Electronic load also includes pre-charge circuit, and pre-charge circuit is by for connecting the charging contactor of charging circuit and filling
Electric resistant series are formed, and pre-charge circuit is in parallel with A.C. contactor 2.Excessive electric current is produced when electric in prevention, inversion is damaged
Device bridge and DC bus capacitor 5.
In the present embodiment, digital signal processing unit 91 uses the microprocessor of TIX；Electric current control
Device 913 processed is using PI controllers (also can be using PR or PID controller)；Inverter bridge 4 is that half-bridge converter (can also be three-phase
Inverter bridge), using insulated gate bipolar transistor (IGBT)；The rated operational voltage Uc of the DC bus capacitor 5 of selection is met such as
Lower condition：Uc >=U × 1.5, wherein, U is the peak value of the tested output voltage of power supply 1.
When being tested using the electronic load tested AC power, operate as follows：
First, charging contactor is closed, by charging resistor, exchange input filter inductance 3 and inverter bridge 4 to DC side electricity
Hold 5 and enter line precharge.After the completion of precharge, closure exchange main contactor 2 simultaneously disconnects charging contactor, and now electronic load is in
Holding state.
The load current characteristic curve of the information containing power factor for needing to simulate is set and straight by man-machine interaction unit 93
The maximum Umax and minimum value Umin of the voltage of lateral capacitance 5 are flowed, and (other communications can be also used by way of RS232 is communicated
Mode) by the load current characteristic curve of setting and setting the voltage of DC bus capacitor 5 maximum Umax and minimum value Umin
Send to and electronic load is started by man-machine interaction unit 93 after the completion of digital signal processing unit 91, data transfer start load
The simulation test of current characteristic curve.
Power supply is tested and input current is realized and the method for work bag of power factor arbitrarily setting and accurate tracking
Include following four step：
(1) by man-machine interaction unit 93 set need simulate the information containing power factor load current characteristic curve and
The maximum Umax and minimum value Umin of the voltage of DC bus capacitor 5, and (also can be using other logical by way of RS232 is communicated
News mode) the maximum Umax and minimum value Umin of the load current characteristic curve of setting and the voltage of DC bus capacitor 5 are transmitted
Electronic load is started by man-machine interaction unit 93 to digital signal processing unit 91, after the completion of data transfer and starts load current
Characteristic simulation test.
(2) current characteristics that load current formation command unit is sent according to man-machine interaction unit 93 in fig. 2 is bent
The tested voltage U1 that line I0 and the detection of tested electric power output voltage detection unit 81 are obtained is calculated by public formula (I) obtains load electricity
Stream instruction Ir：
Ir=I0 × U1 ÷ 220 (I)
(3) load current instruction Ir obtains ac filter inductance with the detection of input filter inductive current detection unit 82 is exchanged
Electric current If is calculated by public formula (II) by subtracter 912 and is obtained current error e：
E=Ir-If (II)
(4) current error e obtains the driving instruction Ui of inverter bridge 4 and by driving by the calculating of PI current controllers 913
Inverter bridge 4IGBT turn-on and turn-off are driven with protection circuit 92, to realize the accurate of load current size and power factor
Simulation and control.
Power supply is tested and energy expenditure is realized and the method for work of stable DC lateral capacitance comprises the following steps：
(a) in figure 3 by maximum Umax, the direct current of the voltage of DC bus capacitor 5 set by man-machine interaction unit 93
The voltage Uf of DC bus capacitor 5 that minimum value Umin and DC capacitor voltage detection unit 83 detection of the voltage of lateral capacitance 5 are obtained
Hystersis controller 914 is together sent to, hystersis controller 914 works according to public formula (III) and public formula (IV)：
As Uf >=Umax, S=1 (III)
As Uf ＜ Umin, S=0 (IV),
Wherein, the maximum Umax and minimum value Umin of the voltage of DC bus capacitor 5 are true by public formula (V) and public formula (VI)
It is fixed：
Umin=U × 1.2 (V), Umax=U × 1.25 (VI), wherein, U is the peak value of tested electric power output voltage；
(b) when hystersis controller 914 exports S=1, driving is turned on the control copped wave of protection circuit 92 module 6, by energy consumption
Resistance 7 is connected with electric discharge of consuming energy with DC bus capacitor 5, maintains the voltage of DC bus capacitor 5 to be no more than Umax.
(c) when hystersis controller 914 exports S=0, driving is turned off with the control copped wave of protection circuit 92 module 6, by energy consumption
Resistance 7 disconnects with DC bus capacitor 5, maintains the voltage of DC bus capacitor 5 to be not less than Umin.
The conducting and shut-off of copped wave module 6 are controlled by above-mentioned a~step c, maintains the operating voltage of DC bus capacitor 5 to exist
In certain scope, it both can ensure that the normal work of inverter bridge 4 in turn ensure that the operation safety of DC bus capacitor 5, and accomplish simultaneously
The purpose consumed energy using energy consumption resistance 7.
From above-described embodiment, electronic load of the present utility model and method of work can arbitrarily set tested power supply defeated
Enter electric current and power factor, and by using copped wave module and energy consumption resistance, while stability contorting DC capacitor voltage
Excess energy is consumed, electronic load circuit is simple in construction, and cost is low.
As it will be easily appreciated by one skilled in the art that the foregoing is only preferred embodiment of the present utility model, not
To limit the utility model, all any modifications made within spirit of the present utility model and principle, equivalent substitution and change
Enter, should be included within protection domain of the present utility model.
Claims (8)
1. a kind of energy consumption type alternating current electronic load, it is characterised in that including A.C. contactor, exchange input filter inductance (3), inverse
Become bridge (4), DC bus capacitor (5), copped wave module (6), energy consumption resistance (7), detection module (8) and control module (9)；
The first end of the A.C. contactor is used as the interface that is connected with the tested pole of power supply (1) one, and the of the A.C. contactor
Two ends are connected with the first end of the exchange input filter inductance (3), the second end of the exchange input filter inductance (3) and institute
The first end connection of inverter bridge (4) is stated, the second end of the inverter bridge (4) is used as and connecing that tested power supply (1) another pole is connected
Mouthful；
The inverter bridge (4) is in parallel with the DC bus capacitor (5) by the end of inverter bridge (4) the 3rd and the 4th end, described
It is in parallel with the DC bus capacitor (5) after copped wave module (6) and the energy consumption resistance (7) series connection；
Detection module (8) first end is used as the interface being connected with the tested power supply (1), for detecting the tested power supply
(1) voltage；The end of detection module (8) second is connected to detect the exchange with the input filter inductance (3) that exchanges
The electric current of input filter inductance (3)；The end of detection module (8) the 3rd is connected to detect institute with the DC bus capacitor (5)
State the voltage of DC bus capacitor (5)；The end of detection module (8) the 4th is connected to pass with the control module (9) first end
The voltage for the tested power supply (1) that censorship is measured, the end of detection module (8) the 5th is connected with the end of control module (9) second
Electric current for transmitting the exchange input filter inductance (3) detected, the end of detection module (8) the 6th and the control
The three-terminal link of module (9) is used for the voltage for transmitting the DC bus capacitor (5) detected；
Control module (9) first end is connected with the end of detection module (8) the 4th, for receiving the tested power supply detected
(1) voltage；The end of control module (9) second is connected with the end of detection module (8) the 5th, for receiving the institute detected
State the electric current of exchange input filter inductance (3)；The end of control module (9) the 3rd and the six end connecting of detection module (8),
Voltage for receiving the DC bus capacitor (5) detected；The end of control module (9) the 4th and the inverter bridge (4)
Connection, conducting and shut-off for controlling the inverter bridge (4)；The end of control module (9) the 5th and the copped wave module (6)
Connection, conducting and shut-off for controlling the copped wave module (6).
2. electronic load as claimed in claim 1, it is characterised in that the detection module (8) includes tested power supply output electricity
Press detection unit (81), exchange input filter inductive current detection unit (82) and DC capacitor voltage detection unit (83)；
Tested electric power output voltage detection unit (81) first end is used as the detection module (8) first end, the tested power supply
The end of output voltage detection unit (81) second is used as the end of detection module (8) the 4th；The exchange input filter inductive current
Detection unit (82) first end is used as the end of detection module (8) second, the exchange input filter inductive current detection unit
(82) second ends are used as the end of detection module (8) the 5th；DC capacitor voltage detection unit (83) first end is used as
The end of detection module (8) the 3rd, the end of DC capacitor voltage detection unit (83) second is used as the detection module (8)
6th end.
3. electronic load as claimed in claim 1, it is characterised in that the control module (9) includes the numeral being connected with each other
Signal processing unit (91) and driving and protection circuit (92)；Digital signal processing unit (91) first end is used as the control
Molding block (9) first end, the end of digital signal processing unit (91) second is used as the end of control module (9) second, described
The end of digital signal processing unit (91) the 3rd is used as the end of control module (9) the 3rd；The driving and protection circuit (92) the
One end is used as the end of control module (9) the 4th, and the driving is used as the control module (9) with the end of protection circuit (92) second
5th end；The control module (9) also includes a man-machine interaction unit being connected with the digital signal processing unit (91)
(93)。
4. electronic load as claimed in claim 3, it is characterised in that the control module (9) is first according to the institute received
State the voltage U1 of tested power supply (1) and the current characteristic curve I0 of setting and obtain load current instruction Ir according to the calculating of public formula (I)：
Ir=I0 × U1 ÷ 220 (I),
Then according to calculate the obtained load current instruct Ir and the electric current If for exchanging input filter inductance (3) according to
Public formula (II) calculates and obtains current error e：E=Ir-If (II), calculates finally according to the current error e and obtains drive finger
Ui is made, so as to control the conducting and shut-off of the inverter bridge (4).
5. electronic load as claimed in claim 3, it is characterised in that the control module (9) is described straight according to what is received
The voltage max Umax and minimum value Umin of the voltage Uf of lateral capacitance (5) and the DC bus capacitor (5) of setting are flowed, is pressed
According to (III) and public formula (IV) work：
As Uf >=Umax, S=1 (III)；
As Uf ＜ Umin, S=0 (IV)；
Wherein, the maximum Umax and minimum value Umin of DC bus capacitor (5) voltage are true by public formula (V) and public formula (VI)
It is fixed：
Umin=U × 1.2 (V), Umax=U × 1.25 (VI),
Wherein, U is the peak value of tested electric power output voltage；
As S=1, the control module (9) controls copped wave module (6) conducting, makes energy consumption resistance (7) and DC bus capacitor
(5) connect, realize that power consumption is discharged and maintains DC bus capacitor (5) voltage to be no more than Umax, as S=0, control copped wave module
(6) turn off, energy consumption module is disconnected with DC bus capacitor (5), maintain DC bus capacitor (5) voltage to be more than Umin.
6. electronic load as claimed in claim 3, it is characterised in that the digital signal processing unit (91) includes stagnant ring control
Device (914) processed, and the load current being sequentially connected instruct to form unit (911), subtracter (912) and current controller (913)；
The first input end of the hystersis controller (914) is used as the end of control module (9) the 3rd, the hystersis controller (914)
Output end connection it is described driving with protection circuit (92)；The load current instructs the first input end to form unit (911)
As the control module (9) first end；Subtracter (912) input is used as the end of control module (9) second；It is described
The output end connection driving and the protection circuit (92) of current controller (913)；The second of the hystersis controller (914) is defeated
Enter end instructs the second input to form unit (911) to be connected man-machine interaction unit (93) with the load current.
7. electronic load as claimed in claim 1, it is characterised in that the electronic load also includes pre-charge circuit, preliminary filling
Circuit is in series by the charging contactor and charging resistor for connecting charging circuit, and pre-charge circuit connects with described exchange
Tentaculum is in parallel.
8. electronic load as claimed in claim 6, it is characterised in that the rated operational voltage Uc of the DC bus capacitor (5)
Meet following condition：Uc >=U × 1.5, wherein, U is the peak value of tested power supply (1) output voltage；The current controller
(913) PI, PR or PID controller are used, the inverter bridge (4) is three phase inverter bridge or half-bridge converter.
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| CN201720036629.0U CN206523614U (en) | 2017-01-12 | 2017-01-12 | A kind of energy consumption type alternating current electronic load |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772128B (en) * | 2017-01-12 | 2018-03-27 | 华中科技大学 | A kind of energy consumption type alternating current electronic load and its method of work |
| CN110632517A (en) * | 2019-10-31 | 2019-12-31 | 中船动力研究院有限公司 | Control device of electric dynamometer and electric dynamometer |
| CN112436767A (en) * | 2020-11-12 | 2021-03-02 | 漳州科华技术有限责任公司 | Voltage control method, system and device and vehicle-mounted converter |
-
2017
- 2017-01-12 CN CN201720036629.0U patent/CN206523614U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772128B (en) * | 2017-01-12 | 2018-03-27 | 华中科技大学 | A kind of energy consumption type alternating current electronic load and its method of work |
| CN110632517A (en) * | 2019-10-31 | 2019-12-31 | 中船动力研究院有限公司 | Control device of electric dynamometer and electric dynamometer |
| CN112436767A (en) * | 2020-11-12 | 2021-03-02 | 漳州科华技术有限责任公司 | Voltage control method, system and device and vehicle-mounted converter |
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