CN108776244A - Electronic load - Google Patents

Electronic load Download PDF

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Publication number
CN108776244A
CN108776244A CN201810826155.9A CN201810826155A CN108776244A CN 108776244 A CN108776244 A CN 108776244A CN 201810826155 A CN201810826155 A CN 201810826155A CN 108776244 A CN108776244 A CN 108776244A
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China
Prior art keywords
current
power
value
voltage
load
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CN201810826155.9A
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Chinese (zh)
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CN108776244B (en
Inventor
高钢
陈熙
陈中洪
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East Group Co Ltd
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East Group Co Ltd
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Priority to CN201810826155.9A priority Critical patent/CN108776244B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments

Abstract

A kind of electronic load, including:Load unit, the load as power-supply device to be measured;Voltage sampling unit, for acquiring the output voltage of power-supply device to be measured as sampled voltage;Current sampling unit, the output current for acquiring power-supply device to be measured acquire the electric current on the energy-storage travelling wave tube of load unit as the second sample rate current as the first sample rate current;Load regulation unit is used for receiving voltage reference value and current reference value, and modulated signal is generated according to current reference value, voltage reference value, sampled voltage, the first sample rate current and the second sample rate current;Modulated signal is used to that load unit to be adjusted to realize that the output to power-supply device to be measured controls;And control unit, it is used for reception pattern switching command, and current reference value and voltage reference value to be adjusted according to pattern switching instruction.Above-mentioned electronic load, which can automatically adjust, realizes that the output to power-supply device to be measured controls, and to meet the test request of power-supply device to be measured, has preferable convenience.

Description

Electronic load
Technical field
The present invention relates to technical field of measurement and test, more particularly to a kind of electronic load.
Background technology
Quick with electric vehicle is popularized, and charging pile is more and more universal.Just in order to ensure charging pile various functions Often, it is required for carrying out charging pile stringent test before manufacture, such as constant pressure and constant current test.Traditional electronic load is all It is resistive load, needs the continuous de-regulation load of tester to meet the test request of the power-supply devices such as charging pile, very not Facilitate test.
Invention content
Based on this, it is necessary to need the continuous de-regulation load of tester to be set to meet charging for traditional electronic load The problem of standby testing requirement, very inconvenient test, provides a kind of electronic load.
A kind of electronic load, including:
Load unit, for being connect with power-supply device to be measured, the load as the power-supply device to be measured;
Voltage sampling unit, for acquiring the output voltage of the power-supply device to be measured as sampled voltage;
Current sampling unit for acquiring the output current of the power-supply device to be measured as the first sample rate current, and is adopted Collect the electric current on the energy-storage travelling wave tube of the load unit as the second sample rate current;
Load regulation unit connects with the load unit, the voltage sampling unit and the current sampling unit respectively It connects, the load regulation unit is used for receiving voltage reference value and current reference value, and is joined according to the current reference value, voltage It examines value, the sampled voltage, first sample rate current and second sample rate current and generates modulated signal;The modulated signal For the load unit being adjusted to realize that the output to the power-supply device to be measured controls;And
Control unit is connect with the load regulation unit;Described control unit is used for reception pattern switching command, and root The current reference value and the voltage reference value are adjusted according to pattern switching instruction.
Above-mentioned electronic load can by control unit according to pattern switching instruction come to current reference value, voltage reference value Be adjusted so that load regulation unit can according to after adjusting current reference value, voltage reference value and sample To sampled voltage, the first sample rate current and the second sample rate current come generate modulated signal with to load unit be adjusted from And realize that the output to power-supply device to be measured controls, to meet the test request of power-supply device to be measured, it is preferable convenient to have Property.
The load unit includes filter circuit, analogue load circuit and energy feedback electricity in one of the embodiments, Road;The analogue load circuit is connect by the filter circuit with the power-supply device to be measured;The analogue load circuit is also It is connect with the energy feedback circuit, the energy feedback circuit is additionally operable to be electrically connected with city;The current sampling unit is used for The electric current of the output end of the analogue load circuit is acquired as the second sample rate current.
The load regulation unit includes the outer loop circuit of electric current, voltage loop circuit, selection electricity in one of the embodiments, Road, current inner loop circuit and pulse width modulation circuit;The outer loop circuit of the electric current be used for according to the current reference value and Error signal between first sample rate current generates current control amount and exports to selection circuit;The voltage loop circuit is used for Voltage control quantity is generated according to the error signal between the voltage reference value and the sampled voltage to export to selection circuit;Institute Selection circuit is stated for choosing the minimum controlled quentity controlled variable in each controlled quentity controlled variable in input and as the electric current of the current inner loop circuit Given value;The current inner loop circuit is used for according to the error signal between the given value of current value and second sample rate current Generate control signal;The pulse width modulation circuit is used to generate the modulated signal according to the control signal.
The outer loop circuit of the electric current, the voltage loop circuit and current inner loop electricity in one of the embodiments, Road all has identical circuit structure;Wherein, the voltage loop circuit includes that the subtracter being sequentially connected and proportional integration are adjusted Device;The error signal that the subtracter is used to both receive the voltage reference value and the sampled voltage and obtain;The ratio Example integral controller to the error signal that the subtracter generates for being adjusted to obtain the voltage control quantity.
The pattern switching instruction includes constant current mode switching command and constant voltage mode switching in one of the embodiments, Instruction;Described control unit is used to be obtained according to the constant current mode switching command or the constant voltage mode switching command and correspond to Target constant parameter target constant value, and by the reference value adjustments of target constant parameter be the target constant value after by its He is adjusted to rated value at the reference value of parameter;The target constant parameter is voltage or electric current.
Further include power samples unit in one of the embodiments, the power conduct for acquiring the load unit Sampled power;The load regulation unit further includes power loop circuit;The power loop circuit respectively with the power samples list Member, described control unit and selection circuit connection;The power loop circuit is used to receive described control unit output Value and power reference simultaneously generates power control quantity output according to the error signal between the value and power reference and the sampled power To the selection circuit.
The pattern switching instruction includes constant current mode switching command, constant voltage mode switching in one of the embodiments, Instruction and constant power mode switching command;Described control unit is used for according to the constant current mode switching command, the constant pressure mould Formula switching command or the constant power mode switching command obtain the target constant value of corresponding target constant parameter, and by mesh The reference value adjustments of constant parameter are marked as the reference value of other parameters is adjusted to rated value after the target constant value;The mesh Mark constant parameter is voltage, electric current or power.
The pattern switching instruction further includes burn-in test mode instruction in one of the embodiments,;The control is single Member is additionally operable to be joined the current reference value, the voltage reference value and the power according to the burn-in test mode instruction It examines value and is set as rated value and enter maximal power tracing pattern to control the electronic load;Or
Described control unit is additionally operable to be monitored the sampled voltage and in the moment for monitoring the sampled voltage Pressure drop controls the electronic load when being more than preset value and enters maximal power tracing pattern.
Described control unit is additionally operable to enter maximal power tracing mould in the electronic load in one of the embodiments, After formula following steps are executed in every predetermined period:
The sampled power at current time is obtained as the second power;
The sampled power in a upper period was obtained as the first power;
It is timing to be more than first power and current disturbing direction in second power, and maximum power electric current is arranged Value plus current disturbing step-length and sets just the current disturbing direction to;
When second power is more than first power and current disturbing direction is negative, by the maximum power electric current Setting value subtract the current disturbing step-length and by the current disturbing it is oppositely arranged be negative;
It is timing to be less than or equal to first power and current disturbing direction in second power, by the maximum work Rate current setting value subtracts the current disturbing step-length and the current disturbing direction is set as negative;
When second power is less than or equal to first power and the current disturbing direction is negative, by described in most High-power current setting value plus the current disturbing step-length and sets just the current disturbing direction to;The maximum power Current setting value is as the current reference value.
Described control unit is to preset regulations speed to the current reference value and the electricity in one of the embodiments, Pressure reference value is adjusted.
Description of the drawings
Fig. 1 is the functional block diagram of the electronic load in an embodiment;
Fig. 2 is the structure diagram of the load unit in an embodiment;
Fig. 3 is the circuit diagram of the analogue load circuit in an embodiment;
Fig. 4 is the structure diagram of the load regulation unit in an embodiment;
Fig. 5 is the circuit diagram of the load regulation unit in an embodiment;
Fig. 6 is the flow chart of the maximum power tracking method in an embodiment;
Fig. 7 is the external characteristic curve figure of the charging pile in an embodiment.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right 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.
One embodiment of the invention provides a kind of electronic load, for being connect with power-supply device to be measured, is set as power supply to be measured Standby load.Power-supply device to be measured may include charging pile, Switching Power Supply, linear power supply, ups power, battery and charger Etc. need to carry out the equipment etc. of constant current function test and pressure-keeping functions test.It is said by taking charging pile as an example in the present embodiment It is bright.
Fig. 1 is the functional block diagram of the electronic load in an embodiment.Referring to Fig. 1, which includes load unit 110, voltage sampling unit 120, current sampling unit 130, load regulation unit 140 and control unit 150.
Load unit 110 with power-supply device 90 to be measured for connecting, the load as power-supply device 90 to be measured.Voltage sample Unit 120 is used to acquire the output voltage of power-supply device 90 to be measured as sampled voltage Vs.Current sampling unit 130 is then used to adopt Collection flows through the output current of power-supply device 90 to be measured as the first sample rate current Is, and acquires the storage in load unit 110 simultaneously Electric current on energy element is as the second sample rate current Il.Load regulation unit 140 respectively with load unit 110, voltage sample list Member 120 and current sampling unit 130 connect.Load regulation unit 140 is also connect with control unit 150.Control unit 150 is used Current reference value Iset and voltage reference value Vset are adjusted in reception pattern switching command, and according to pattern switching instruction Output is to load regulation unit 140 after section.Load regulation unit 140 receives current reference value Iset, the first sample rate current Il, the Two sample rate current Is, voltage reference value Vset and sampled voltage Vs, and modulated signal is generated according to it.The modulated signal is used for Load unit 110 is adjusted and realizes that the output to power-supply device 90 to be measured controls.Such as under constant current mode switching command, The electric current that modulated signal is used to control 110 side of load unit is constant, to realize the perseverance to the output current of power-supply device 90 to be measured Fixed control.
Above-mentioned electronic load can by control unit 150 according to pattern switching instruction come to current reference value Iset, electricity Pressure reference value Vset is adjusted, so that load regulation unit 140 can be according to current reference value Iset, the electricity after adjusting Sampled voltage Vs, the first sample rate current Is and the second sample rate current Il that pressure reference value Vset and sampling obtain adjust to generate Signal processed is to be measured to meet load unit 110 to be adjusted to realize that the output to power-supply device 90 to be measured controls The test request of power-supply device 90 has preferable convenience.
In one embodiment, the structure diagram of load unit 110 is as shown in Figure 2.Load unit 110 includes filter circuit 112, analogue load circuit 114 and energy feedback circuit 116.Wherein, the both ends of analogue load circuit 114 pass through filter circuit 112 connect with power-supply device 90 to be measured.And analogue load circuit 114 is also connect with energy feedback circuit 116.Energy feedback circuit 116 output end is also electrically connected with city.Energy feedback circuit 116 is used to the energy of the generation of electronic load being converted to electric energy and return It is fed to power grid.Therefore, the electronic load in the present embodiment can also be referred to as feedback type electronic load.Feedback type electronic load is logical It crosses and reuses electric energy feedback to power grid, for traditional resistive load, the energy is greatly saved, avoids energy The waste in source.At this point, current sampling unit 130 acquires the electric current on the energy-storage travelling wave tube of analogue load circuit 114, adopted as second Sample electric current Il.It in other examples, can also be by filter circuit 112 and analogue load circuit 114 as a whole.
In one embodiment, analogue load circuit 114 uses inductance type DC-DC booster circuit, filter circuit 112 to adopt With filter capacitor C2, as shown in Figure 3.At this point, energy-storage travelling wave tube is energy storage inductor L.Energy feedback circuit 116 then uses DC-AC electricity Road.Therefore, the second sample rate current is also the electric current Il flowed through on inductance L.In one embodiment, DC-DC and DC-AC are Two-way, the testing requirement of the wide-voltage range of charging pile 200V to 750V can be met.It can be incited somebody to action after preceding stage DC-DC circuit start The voltage that power-supply device 90 to be measured exports increases the input as DC-AC.DC-AC is used for grid-connected and energy is fed back to power grid, Achieve the purpose that feedback grid.DC-DC circuit can according to the output voltage of the output dynamically regulated DC-DC circuit of charging pile, Namely the input voltage of DC-AC.Specifically, the mode of linear regulation may be used in DC-DC circuit, is exported most in charging pile Low, ceiling voltage correspondence meets DC-AC required voltage values.For example, the test voltage of charging pile is 200V to 750V, will correspond to The output voltage setting of DC-DC circuit be 550V to 800V, the raised relationship of voltage is arranged as follows:
Vout=0.4545Vc+459.
Wherein, Vout is the output voltage of DC-DC circuit, and Vc is the output voltage (namely sampled voltage) of charging pile, this If sample, when the output voltage of charging pile is 200V, the output voltage of DC-DC circuit is 550V;The output voltage of charging pile is When 750V, the output voltage of DC-DC circuit is 800V.
In one embodiment, load regulation unit 140 includes voltage loop circuit 210, the outer loop circuit 220 of electric current, selection electricity Road 230, current inner loop circuit 240 and pulse width modulation circuit (PWM modulation circuit) 250, as shown in Figure 4.Wherein, voltage Loop circuit 210 is used to generate voltage control quantity to selection according to the error signal between voltage reference value Vset and sampled voltage Vs Circuit 230.Loop circuit 220 is then used for according to the error signal between current reference value Iset and the first sample rate current Is outside electric current Current control amount is generated to export to selection circuit 230.Selection circuit 230 is then used to choose voltage loop circuit 210 and electric current outer shroud Minimum controlled quentity controlled variable and the given value of current value Ilref as current inner loop circuit 240 in the controlled quentity controlled variable that circuit 220 exports.In electric current Loop circuit 240 is used to generate control signal according to the error signal between the given value of current value Ilref and the second sample rate current Il. PWM modulation circuit 250 is used for according to control signal generation modulated signal to control the power tube in DC-DC circuit, Realize control to electric current and voltage in DC-DC circuit, so it is final realize to the constant pressure of power-supply device 90 to be measured or Current constant control.
In the present embodiment, the outer loop circuit 220 of voltage loop circuit 210, electric current and current inner loop circuit 240 all have phase Same circuit structure, it is specific as shown in Figure 5.It is illustrated by taking outer voltage circuit 210 as an example below.Outer voltage circuit 210 Including the subtracter 212 being sequentially connected and proportional and integral controller (pi regulator) 214.Wherein, an input of subtracter 212 End is connect with voltage sampling unit 120, another input terminal is then connect with control unit 150.212 receiving voltage of subtracter samples The voltage reference value Vset that the sampled voltage Vs and control unit 150 that unit 120 exports are exported.Subtracter 212 is used for will be electric Pressure reference value Vset, which is subtracted after sampled voltage Vs obtains error signal between the two, to be input in pi regulator 214.PI is adjusted The error signal that device 214 is used to generate subtracter 212 obtains voltage control quantity into horizontal-linearity control.Loop circuit 220 outside electric current Current control amount equally can be formed according to current reference value Iset and the first sample rate current Is.
In the present embodiment, pattern switching instruction includes constant current mode switching command and constant voltage mode switching command.Pattern Switching command can be inputted by user by equipment such as mouse, keyboard, touch control keyboard, speech recognitions.Constant current mode switches Instruction refers to that control power-supply device 90 to be measured is in constant current mode, therefore its target constant parameter is electric current.Constant voltage mode switches Instruction refers to that control power-supply device 90 to be measured is in constant voltage mode, therefore its target constant parameter is voltage.Control unit 150 exists After receiving constant current mode switching command, target constant parameter namely electric current are adjusted to target constant value, then other are joined Number (being at this time voltage) is adjusted to most rated value.Therefore, after voltage is adjusted to rated value, voltage loop circuit 210 will gradually become In saturation, loop circuit 220 works only outside electric current at this time, and then reaches the mesh of the output current of constant power-supply device to be measured 90 's.Control unit 150 is adjusted to target constant after receiving constant voltage mode switching command, by target constant parameter namely voltage After value, then other parameters (being at this time electric current) are adjusted to rated value.Therefore, after electric current is adjusted to rated value, electric current outer shroud electricity Road 220 will gradually tend to be saturated, and only voltage loop circuit 210 works at this time, and then reach constant power-supply device to be measured 90 Output voltage purpose.
In one embodiment, further include power samples unit.Power samples unit is for acquiring power-supply device 90 to be measured Output power.In one embodiment, power samples unit is connect with current sampling unit 130 and voltage sampling unit 120 respectively, The first sample rate current Is and voltage sampling unit 120 to directly be collected using current sampling unit 130 are collected Sampled voltage Vs sampled power Ps is calculated.At this point, load regulation unit 140 further includes power loop circuit 260, such as Fig. 4 It is shown.Power loop circuit 260 is connect with power samples unit, control unit 150 and selection circuit 230 respectively.Power ring electricity Error signal of the road 260 between the value and power reference Pset exported and sampled power Ps of reception control unit 150 generates work( Output is selected to selection circuit 230 after rate controlled quentity controlled variable.Power loop circuit 260 and voltage loop circuit 210 and electric current outer shroud 220 circuit structure having the same of circuit, as shown in figure 5, do not repeat herein.
In the present embodiment, pattern switching instruction further includes constant power mode switching command.Constant power mode switching command Output power for controlling power-supply device to be measured is constant.When control unit 150 receives constant power mode switching command, control Other parameters (including electric current and voltage at this time) are adjusted to rated value again after value and power reference processed to target constant value.Therefore, Loop circuit 220 can gradually tend to be saturated outside voltage loop circuit 210 and electric current, and only power loop circuit 260 works at this time, into And achieve the purpose that the output power of constant power-supply device to be measured 90.Control unit 150 is receiving constant current or constant voltage mode When switching command, current reference value or voltage reference value can be adjusted to again to adjust other parameters to specified after desired value Value.It is adjusted to rated value by first by target constant parameter adjustment to desired value, then by other parameters, it can be to avoid parameter adjustment The case where bearing power excessive maximum power more than power-supply device 90 to be measured, occurs in the process.
In one embodiment, pattern switching instruction further includes burn-in test mode instruction.Burn-in test mode instruction refers to Power-supply device to be measured is in burn-in test pattern namely electronic load as negative during power-supply device burn-in test to be measured It carries.Control unit 150 can be after receiving burn-in test mode instruction, by current reference value Iset, voltage reference value Vset And value and power reference Pset is set as rated value and enters maximal power tracing pattern to control electronic load.Or control unit 150 can the moment pressure drop Vdroop for monitoring sampled voltage be more than preset value when control electronic load enter maximum power with Track pattern to seeking maximum power value into line trace to maximum power point, and then ensures power-supply device to be measured 90 in power Maximum point aging.Specifically, when power-supply device to be measured is charging pile, external characteristic curve is as shown in Figure 7.With one in Fig. 7 Rated voltage 750V, rated current 20A, for the charging pile pattern of rated power 15KW, maximum current 22A.When booting, Charging pile can be with maintenance voltage in 750V, and as load increases, output current, power increase.When bearing power is more than charging pile Power when, it may appear that two kinds of situations maintain another low voltage point, power first, charging pile output voltage is dragged down Decline.Besides just directly charging pile output is drawn across alarm shutdown.Therefore, it is one in the small-power stage according to output characteristics Section constant voltage process, if the certain value Vdroop of the unexpected voltage die of voltage, then it is assumed that be that bearing power is excessive, be more than to fill At this moment the maximum power of electric stake enters in the pattern of power maximum tracking, and forms power tracking mode flags.In this implementation In example, preset value Vdroop is set as the rated voltage that Vdroop=(12+Vdc × 0.025) V, Vdc is charging pile, works as decline It is just made a forcible entry into power tracking pattern when Vdroop.
In one embodiment, MPPT maximum power point tracking is carried out using the method for current disturbing.Control unit 150 is in electronics Load enters after maximal power tracing pattern executes step as shown in Figure 6 per predetermined period.In the present embodiment, predetermined period For 20ms, in other examples, predetermined period can also be arranged as required to.Fig. 6 includes the following steps:
Step S310 obtains the sampled power at current time as the second power.
Second power P 1 can be obtained by power samples unit.Storage device is also provided in electronic load The each collected sampled power of storage.
Step S320 obtained the sampled power in a upper period as the first power.
The sampled power in a upper period can be directly read out from storage device.When a upper period can not be read When sampled power, by the first power setting be 0 namely first the default value of power P 0 be 0.
Step S330, judges whether the second power is more than the first power.
Indicate that power increases at any time, thens follow the steps S340, otherwise holds when second power P 1 is more than the first power P 0 Row step S370.
Step S340 judges whether current disturbing direction is just.
In one embodiment, the value of current disturbing direction Idir is 0 or 1.When current disturbing direction is timing, Idir is 0, when current disturbing direction is negative, Idir 1.It is just still being negative to judge that current disturbing direction is, actually judges Idir Whether 0 process is equal to.When Idir is equal to 0, indicate that current disturbing direction is just, to then follow the steps S350, otherwise hold Row step S360.
Maximum power current setting value is increased current disturbing step-length, sets just current disturbing direction to by step S350.
Since the second power P 1 is more than the first power P 0, and current disturbing direction is just, to continue to increase maximum power at this time Current setting value Imppset is set just current disturbing direction to determining maximum power point.Maximum power electric current is set Value Imppset is set as the current reference value Iset under burn-in test pattern.
Step S360, current disturbing step-length is subtracted by maximum power current setting value, and current disturbing direction is set as negative.
Step S370 judges whether current disturbing direction is just.
When Idir is equal to 0, indicate that current disturbing direction is just, to then follow the steps S380, it is no to then follow the steps S390.
Step S380, current disturbing step-length is subtracted by maximum power current setting value, and current disturbing direction is set as negative.
Maximum power current setting value is increased current disturbing step-length, sets just current disturbing direction to by step S390.
By the above method, electronic load can record corresponding under current flow after ingoing power maximum tracing mode Performance number (is disturbed) by current perturbation for forward direction, at this time in recording powers of laser beam after disturbance, by comparing the big of the two power It is small, when increasing when power, then continues to increase electric current, then reduce electric current when power reduces, constantly pass through the adjusting of electric current To find maximum power value.It when current perturbation is that negative sense disturbs, then needs to do opposite processing, namely reduces electric current to find Maximum power value so that the power maximum output of power-supply device to be measured, the aging operating mode being optimal.In this adjustment process In, electric current and voltage will not be all limited to rated value or target constant value.
In one embodiment, control unit can't be to some ginseng during the reference value to each parameter is adjusted Number jumped or bust, but can be adjusted with certain regulations speed.The regulations speed of parameter can be according to need It is set, such as can be 100V/s by voltage renewal rate, namely per 0.1V/ms, so often passing through 1ms, voltage is given Definite value Vset just changes 0.1V.Can current reference value and value and power reference be set in the same way.Regulations speed can be with By user's manual setting, can also be arranged by system default.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (10)

1. a kind of electronic load, which is characterized in that including:
Load unit, for being connect with power-supply device to be measured, the load as the power-supply device to be measured;
Voltage sampling unit, for acquiring the output voltage of the power-supply device to be measured as sampled voltage;
Current sampling unit for acquiring the output current of the power-supply device to be measured as the first sample rate current, and acquires institute The electric current on the energy-storage travelling wave tube of load unit is stated as the second sample rate current;
Load regulation unit is connect with the load unit, the voltage sampling unit and the current sampling unit, institute respectively Load regulation unit is stated for receiving voltage reference value and current reference value, and according to the current reference value, voltage reference value, The sampled voltage, first sample rate current and second sample rate current generate modulated signal;The modulated signal is used for The load unit is adjusted to realize that the output to the power-supply device to be measured controls;And
Control unit is connect with the load regulation unit;Described control unit is used for reception pattern switching command, and according to institute Pattern switching instruction is stated the current reference value and the voltage reference value is adjusted.
2. electronic load according to claim 1, which is characterized in that the load unit includes filter circuit, simulates and bear Carry circuit and energy feedback circuit;The analogue load circuit is connect by the filter circuit with the power-supply device to be measured; The analogue load circuit is also connect with the energy feedback circuit, and the energy feedback circuit is additionally operable to be electrically connected with city;Institute The electric current of output end of the current sampling unit for acquiring the analogue load circuit is stated as the second sample rate current.
3. electronic load according to claim 2, which is characterized in that the load regulation unit includes electric current outer shroud electricity Road, voltage loop circuit, selection circuit, current inner loop circuit and pulse width modulation circuit;The outer loop circuit of the electric current is used for It is exported according to the error signal generation current control amount between the current reference value and first sample rate current and gives selection electricity Road;The voltage loop circuit is used to generate voltage control according to the error signal between the voltage reference value and the sampled voltage Amount processed is exported to selection circuit;The selection circuit is used to choose the minimum controlled quentity controlled variable in each controlled quentity controlled variable in input and as institute State the given value of current value of current inner loop circuit;The current inner loop circuit according to the given value of current value and described second for adopting Error signal between sample electric current generates control signal;The pulse width modulation circuit is used to be generated according to the control signal The modulated signal.
4. electronic load according to claim 3, which is characterized in that the electric current outer loop circuit, the voltage loop circuit And the current inner loop circuit all has identical circuit structure;Wherein, the voltage loop circuit includes subtracting of being sequentially connected Musical instruments used in a Buddhist or Taoist mass and proportional and integral controller;The subtracter is for receiving the voltage reference value and the sampled voltage and obtaining the two Error signal;The proportional and integral controller to the error signal that the subtracter generates for being adjusted to obtain the electricity Press controlled quentity controlled variable.
5. electronic load according to claim 3 or 4, which is characterized in that the pattern switching instruction includes constant current mode Switching command and constant voltage mode switching command;Described control unit is used for according to the constant current mode switching command or the perseverance Die pressing type switching command obtains the target constant value of corresponding target constant parameter, and by the reference value adjustments of target constant parameter For the reference value of other parameters is adjusted to rated value after the target constant value;The target constant parameter is voltage or electricity Stream.
6. electronic load according to claim 3 or 4, which is characterized in that further include power samples unit, for acquiring The power of load unit is stated as sampled power;The load regulation unit further includes power loop circuit;The power loop circuit It is connect respectively with the power samples unit, described control unit and the selection circuit;The power loop circuit is for connecing It receives the value and power reference of described control unit output and is believed according to the error between the value and power reference and the sampled power Number generate power control quantity export to the selection circuit.
7. electronic load according to claim 6, which is characterized in that the pattern switching instruction includes constant current mode switching Instruction, constant voltage mode switching command and constant power mode switching command;Described control unit according to the constant current mode for cutting It changes instruction, the constant voltage mode switching command or the constant power mode switching command and obtains corresponding target constant parameter Target constant value, and be after the target constant value by the reference value tune of other parameters by the reference value adjustments of target constant parameter Whole is rated value;The target constant parameter is voltage, electric current or power.
8. electronic load according to claim 7, which is characterized in that the pattern switching instruction further includes burn-in test mould Formula instructs;Described control unit is additionally operable to be joined the current reference value, the voltage according to the burn-in test mode instruction It examines value and the value and power reference is set as rated value and enters maximal power tracing pattern to control the electronic load;Or
Described control unit is additionally operable to be monitored the sampled voltage and in the moment pressure drop for monitoring the sampled voltage The electronic load is controlled when more than preset value enters maximal power tracing pattern.
9. electronic load according to claim 8, which is characterized in that described control unit is additionally operable in the electronic load After into maximal power tracing pattern following steps are executed in every predetermined period:
The sampled power at current time is obtained as the second power;
The sampled power in a upper period was obtained as the first power;
It is timing to be more than first power and current disturbing direction in second power, and maximum power current setting value is added Upper current disturbing step-length simultaneously sets just the current disturbing direction to;
When second power is more than first power and current disturbing direction is negative, the maximum power electric current is arranged Value subtract the current disturbing step-length and by the current disturbing it is oppositely arranged be negative;
It is timing to be less than or equal to first power and current disturbing direction in second power, by maximum power electricity Stream setting value subtracts the current disturbing step-length and the current disturbing direction is set as negative;
When second power is less than or equal to first power and the current disturbing direction is negative, by the maximum work Rate current setting value plus the current disturbing step-length and sets just the current disturbing direction to;The maximum power electric current Setting value is as the current reference value.
10. electronic load according to claim 1, which is characterized in that described control unit is with default regulations speed to institute It states current reference value and the voltage reference value is adjusted.
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