CN106772128B - A kind of energy consumption type alternating current electronic load and its method of work - Google Patents
A kind of energy consumption type alternating current electronic load and its method of work Download PDFInfo
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- CN106772128B CN106772128B CN201710022612.4A CN201710022612A CN106772128B CN 106772128 B CN106772128 B CN 106772128B CN 201710022612 A CN201710022612 A CN 201710022612A CN 106772128 B CN106772128 B CN 106772128B
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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Abstract
The invention 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 form loop with DC bus capacitor, and copped wave module and energy consumption resistance are connected on the both 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.The present invention discloses the method for work of the electronic load.
Description
Technical field
The invention belongs to power electronic equipment field, and in particular to a kind of energy consumption type alternating current electronic load and its work side
Method.
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, can not adapt to the accurate test of power supply.
Most of existing electronic load uses grid-connected energy feedback type structure, is that can save energy the advantages of which
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 use.
Energy consumption type alternating current electronic load connects the conversion of tested mains side typically using back type converters are leaned against
Device generally requires 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 electricity
Son load is using by controlling multiple power devices in parallel (such as transistor or MOSFET) 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, it is the size that can only adjust load current that the electronic load of the type, which also has the defects of fatal, in addition, and can not be adjusted 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 in fact
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 invention provides a kind of energy consumption type alternating current electronic load,
A kind of simple in construction, system stabilization is devised by using components such as inverter bridge, DC bus capacitor, copped wave module and energy consumption resistances
High-power energy consumption type alternating current electronic load, realize any adjustable of tested source current and power factor.
To achieve the above object, it is proposed, according to the invention, provide a kind of energy consumption type alternating current electronic load, including ac contactor
Device, 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 connects, 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, for detecting the voltage of 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 what transmission 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, for receiving the voltage of the tested power supply detected；Control
The end of molding block second is connected with the end of detection module the 5th, for receiving the electric current of the exchange input filter inductance detected；Control
The end of module the 3rd and detection module six end connecting, for receiving the voltage of the DC bus capacitor detected；Control module the 4th
End is connected with inverter bridge, for controlling the conducting and shut-off of 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 of the tested power supply received and the electricity that exchanges input filter inductance
Stream and the current characteristic curve of setting generation control instruction, control the conducting and shut-off of inverter bridge, it is big to realize load current
Small and the accurate simulation and control of 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, tested the second end of electric power output voltage detection unit are 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 the second end of exchange input filter inductive current detection unit 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
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 are 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
Load current instruction Ir is calculated according to public formula (I)：Ir=I0 × U1 ÷ 220 (I), then according to the load electricity being calculated
Current error e is calculated according to public formula (II) with the electric current If for exchanging input filter inductance in stream instruction Ir：E=Ir-If (I),
Driving instruction Ui is finally calculated according to current error e, so as to control the conducting of inverter bridge and shut-off.
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, energy consumption resistance is connected with DC bus capacitor, realize power consumption
Discharge and maintain DC capacitor voltage to be no more than Umax, as S=0, control copped wave module shut-off, make 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 is used as the end of control module the 3rd, hystersis controller it is defeated
Go out end connection driving and protection circuit；Load current, which instructs, to be formed the first input end of unit and is 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.By designing pre-charge circuit, electricity in prevention
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.
According to another aspect of the present invention, there is provided one kind carries out AC electric source testing realization using above-mentioned electronic load
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
Load current is calculated by public formula (I) and instructs 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) driving instruction Ui is calculated according to current error e, realizes the conducting and shut-off of inverter bridge；Thus mode, it is real
The accurate simulation and control of load current size and power factor are showed；
According to another aspect of the present invention, there is provided real when one kind is using above-mentioned electronic load progress AC electric source testing
The method of work of existing energy expenditure 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, energy consumption resistance is connected with DC bus capacitor, realize power consumption electric discharge
And maintain DC capacitor voltage to be no more than Umax, as S=0, control copped wave module shut-off, make 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 power consumption purpose.
In general, by the contemplated above technical scheme of the present invention compared with prior art, can obtain following has
Beneficial effect：
(1) using the electronic load of the present invention, tested mains input current and power factor not only can be arbitrarily set, and
And do not allow the special occasions of energy feedback can the normal operation electronic load in no power network or power network yet.
(2) stable DC lateral capacitance electricity is being accomplished by using copped wave module and energy consumption resistance, electronic load of the invention
Excess energy is consumed while pressure, not only circuit structure is simple, and simplifies tested electric power outputting current tracking control unit
Design, cost is low, and overcoming conditional electronic and being supported under special occasions can not use and the shortcomings that circuit complexity cost is high.
Brief description of the drawings
Fig. 1 is structural representation when a kind of energy consumption type alternating current electronic load connection of the present invention is tested power supply.
Fig. 2 is the tested electric power outputting current tracing control block diagram according to electronic load of the present invention.
Fig. 3 is to realize power consumption and DC capacitor voltage using copped wave module and energy consumption resistor according to electronic load of the present invention
The control block diagram of stabilization.
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
Holding, 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 to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
Embodiment
As shown in figure 1, a kind of energy consumption type alternating current electronic load includes A.C. contactor 2, exchanges input filter inductance 3, be 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 are 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 1 another pole of power supply 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, for detecting the voltage of tested power supply 1, it is tested the end of electric power output voltage detection unit 81 second and control module
9 first ends are connected to the voltage for the tested power supply 1 that transmission detects；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, exchanges input filter inductive current
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 to form the first input end of unit 911 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 of the electric current and setting that exchange 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 form, and pre-charge circuit is in parallel with A.C. contactor 2.Excessive electric current, damage inversion are produced when electric in prevention
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 (can also use 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 meets 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, operation is 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 that needs to simulate and straight is set 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 communications
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 digital signal processing unit 91 to, starting electronic load by man-machine interaction unit 93 after the completion of data transfer starts to load
The simulation test of current characteristic curve.
Power supply is tested and realize input current and power factor arbitrarily set and accurate tracking method of work bag
Include following four step：
(1) set by man-machine interaction unit 93 the load current characteristic curve of the information containing power factor that needs to simulate and
The maximum Umax and minimum value Umin of the voltage of DC bus capacitor 5, and (can also be used other logical by way of RS232 communications
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) load current forms the current characteristics song that command unit is sent according to man-machine interaction unit 93 in fig. 2
Load electricity is calculated by public formula (I) in the tested voltage U1 that line I0 and the detection of tested electric power output voltage detection unit 81 obtain
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
Current error e is calculated by public formula (II) by subtracter 912 in electric current If：
E=Ir-If (II)
(4) current error e is calculated the driving instruction Ui of inverter bridge 4 by PI current controllers 913 and passes through driving
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 realizes energy expenditure 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 obtain
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 controls copped wave module 6 to turn on protection circuit 92, by energy consumption
Resistance 7 is connected with DC bus capacitor 5 with electric discharge of consuming energy, and maintains the voltage of DC bus capacitor 5 to be no more than Umax.
(c) when hystersis controller 914 exports S=0, driving controls copped wave module 6 to turn off with protection circuit 92, 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 safe for operation of DC bus capacitor 5, and accomplish simultaneously
The purpose to be consumed energy using energy consumption resistance 7.
From above-described embodiment, electronic load of the invention and method of work can arbitrarily set tested power input electricity
Stream and power factor, and by using copped wave module and energy consumption resistance, consume while stability contorting DC capacitor voltage
Excess energy, electronic load circuit is simple in construction, cost is low.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (9)
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 connecing with what tested power supply (1) another pole was 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；
The detection module (8) includes tested electric power output voltage detection unit (81), the inductive current detection of exchange input filter
Unit (82) and DC capacitor voltage detection unit (83)；Detection module (8) first end is used as and the tested power supply
(1) interface of connection, for detecting the voltage of the tested power supply (1)；The end of detection module (8) second with it is described exchange it is defeated
Enter the electric current that filter inductance (3) is connected to detect the exchange input filter inductance (3)；The end of detection module (8) the 3rd
It is connected to detect the voltage of the DC bus capacitor (5) with the DC bus capacitor (5)；The end of detection module (8) the 4th
The voltage for the tested power supply (1) that transmission detects, the detection module (8) are connected to the control module (9) first end
5th end is connected to transmit the electricity for exchanging input filter inductance (3) detected with the end of control module (9) second
Stream, the end of detection module (8) the 6th are used to transmit the DC side detected with the three-terminal link of control module (9)
The voltage of electric capacity (5)；
The control module (9) includes the digital signal processing unit (91) being connected with each other and driving and protection circuit (92)；Institute
State control module (9) first end to be connected with the end of detection module (8) the 4th, for receiving the tested power supply (1) detected
Voltage；The end of control module (9) second is connected with the end of detection module (8) the 5th, for receiving the friendship detected
Flow the electric current of input filter inductance (3)；The end of control module (9) the 3rd and the six end connecting of detection module (8), are used for
Receive the voltage of the DC bus capacitor (5) detected；The end of control module (9) the 4th is connected with the inverter bridge (4),
For controlling the conducting and shut-off of the inverter bridge (4)；The end of control module (9) the 5th is connected with the copped wave module (6),
For controlling the conducting and shut-off of the copped wave module (6).
2. electronic load as claimed in claim 1, it is characterised in that the tested electric power output voltage detection unit (81)
One end is used as the detection module (8) first end, and the tested end of electric power output voltage detection unit (81) second is used as described
The end of detection module (8) the 4th；Described exchange input filter inductive current detection unit (82) first end is used as the detection module
(8) second ends, the end of exchange input filter inductive current detection unit (82) second are used as the detection module (8) the 5th
End；DC capacitor voltage detection unit (83) first end is used as the end of detection module (8) the 3rd, the DC side electricity
Hold the end of voltage detection unit (83) second and be used as the end of detection module (8) the 6th.
3. electronic load as claimed in claim 2, it is characterised in that digital signal processing unit (91) first end is used as
Control module (9) first end, the end of digital signal processing unit (91) second are used as the control module (9) second
End, 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) first end is used as the end of control module (9) the 4th, and the driving is used as the control with the end of protection circuit (92) second
The end of module (9) the 5th；The control module (9) also includes a man-machine interaction being connected with the digital signal processing unit (91)
Unit (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 load current instruction Ir is calculated according to public formula (I)：
Ir=I0 × U1 ÷ 220 (I), input filter inductance is then exchanged with described according to the load current instruction Ir being calculated
(3) current error e is calculated according to public formula (II) in electric current If：E=Ir-If (II), finally according to the current error e
Driving instruction Ui is calculated, 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
Worked according to (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 DC bus capacitor (5) voltage are true by public formula (VI) and public formula (V)
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 resistance 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 to form the first input end of 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 to instruct to form the second input of unit (911) and 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 1, 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.
9. electronic load as claimed in claim 6, it is characterised in that the current controller (913) using PI, PR or
PID controller, the inverter bridge (4) are three phase inverter bridge or half-bridge converter.
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| CN109765502B (en) * | 2019-03-13 | 2020-12-01 | 哈尔滨工业大学 | Program-controlled direct current electronic load |
| CN114152850B (en) * | 2020-08-19 | 2023-03-21 | 华中科技大学 | Dynamic testing device for testing switch performance of power module |
| CN112130088A (en) * | 2020-09-17 | 2020-12-25 | 成都安捷宜电子有限公司 | Dummy load testing device and automatic power adjusting method thereof |
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| CN101191799B (en) * | 2006-11-30 | 2010-08-18 | 中兴通讯股份有限公司 | AC load |
| CN100507590C (en) * | 2007-05-15 | 2009-07-01 | 北京索英电气技术有限公司 | Multiple input path modular high frequency isolation single phase power feedback type electronic load |
| CN101873074A (en) * | 2010-05-14 | 2010-10-27 | 保定中恒电气有限公司 | Three-phase miniature high frequency switching power supply |
| CN102263502A (en) * | 2010-10-21 | 2011-11-30 | 江苏大全凯帆电器股份有限公司 | High-power wind power converter energy storage capacitor charging circuit |
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