CN115166571A - Test method of battery charging system based on digital control - Google Patents

Test method of battery charging system based on digital control Download PDF

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Publication number
CN115166571A
CN115166571A CN202210771008.2A CN202210771008A CN115166571A CN 115166571 A CN115166571 A CN 115166571A CN 202210771008 A CN202210771008 A CN 202210771008A CN 115166571 A CN115166571 A CN 115166571A
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China
Prior art keywords
battery charging
charging system
testing
circuit
apfc
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CN202210771008.2A
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Chinese (zh)
Inventor
孙海涛
刘亮
崔凯波
程兆刚
蒋有才
郭德卿
赵玉龙
俞文文
张飒
齐子元
殷军辉
邓辉咏
薛德庆
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Army Engineering University of PLA
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Army Engineering University of PLA
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Priority to CN202210771008.2A priority Critical patent/CN115166571A/en
Publication of CN115166571A publication Critical patent/CN115166571A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0043—Converters switched with a phase shift, i.e. interleaved
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a test device, a method and a device for a digital control battery charging system, the device comprises: the device comprises a programmable alternating current power supply, electronic load equipment, an oscilloscope, auxiliary equipment and a tested experimental prototype; the tested experimental prototype is electrically connected with a programmable alternating current power supply which supplies power for the testing equipment; the electronic load equipment, the oscilloscope and the auxiliary equipment are all electrically connected with the tested experimental prototype. The method and the device aim to solve the problem of how to test the battery charging system based on digital control.

Description

Test method of battery charging system based on digital control
Technical Field
The present application relates to the field of charging system testing, and in particular, to a testing apparatus, method and device for a digitally controlled battery charging system.
Background
In the field of current battery charging systems, from a topological point of view, the circuits used in large numbers are mainly of the following types: phase-controlled power supplies, linear power supplies and switching power supplies. The three power supplies have serious harmonic problems, and if no harmonic treatment measures are taken, serious harmonic pollution is caused to a power supply system, so that the loss is increased, and the power factor is reduced. Therefore, high power factor has become an important indicator of the quality of battery charging systems. To solve these problems, a digital control-based battery charging system is provided, which employs a two-stage charging topology, including: the test of the front stage APFC circuit and the rear stage DC/DC circuit aiming at the battery charging system based on digital control is still blank in the industry at present.
Disclosure of Invention
The application provides a testing device and a testing method for a digital control battery charging system, which at least solve the problem of testing the digital control-based battery charging system.
According to a first aspect of the present application, there is provided a test apparatus for a digitally controlled battery charging system, comprising: the device comprises a programmable alternating current power supply, electronic load equipment, an oscilloscope, auxiliary equipment and a tested experimental prototype;
the tested experimental prototype is electrically connected with a programmable alternating current power supply which supplies power for the testing equipment;
the electronic load equipment, the oscilloscope and the auxiliary equipment are all electrically connected with the tested experimental prototype.
In one embodiment, the auxiliary equipment includes a high voltage differential isolation probe, a high frequency current signal sensor, a power meter analyzer, and a multimeter.
In one embodiment, the experimental prototype to be tested is of a two-stage topological structure, the front stage is an APFC circuit in staggered parallel connection and mainly realizes boosting and power factor correction, and the rear stage is an isolated phase-shifted full-bridge DC-DC circuit.
In one embodiment, the APFC circuit is connected in parallel with the DC/DC circuit;
the APFC circuit comprises an APFC converter and an APFC controller, and the APFC controller is used for controlling the APFC converter;
the DC/DC circuit comprises a DC/DC converter and a DC/DC controller, and the DC/DC controller is used for controlling the DC/DC converter.
In one embodiment, the control mode adopted by the APFC controller is an average current control mode in an inductor current continuous conduction mode.
In one embodiment, the DC/DC circuit is based on a phase-shifted full-bridge converter, 2 clamping diodes and 1 resonant inductor are added on two sides of a transformer, and the transformer is connected with a hysteresis bridge arm.
According to another aspect of the present application, based on the above test device, the present application further provides a test method for a digitally controlled battery charging system, including:
testing a front-stage APFC circuit of a tested experimental prototype in the whole load range by using test equipment aiming at a digital control battery charging system to obtain an input characteristic analysis result of a two-unit staggered parallel APFC circuit under a full load condition;
determining whether the design of the two-unit staggered parallel APFC circuit is reasonable or not according to the input characteristic analysis result;
testing a rear-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype by testing equipment of a digital control battery charging system to obtain an actually measured waveform under a rated load condition;
and carrying out efficiency test on the tested experimental prototype by aiming at the test equipment of the digital control battery charging system to obtain an efficiency curve.
According to a third aspect of the present application, there is provided a test apparatus for a digitally controlled battery charging system, comprising:
the pre-stage test unit is used for testing a pre-stage APFC circuit of a tested experimental prototype in the whole load range by utilizing test equipment aiming at a digital control battery charging system to obtain an input characteristic analysis result of the two-unit staggered parallel APFC circuit under the full load condition;
the design evaluation unit is used for determining whether the design of the APFC circuit with two units connected in parallel in a staggered mode is reasonable or not according to the input characteristic analysis result;
the rear-stage testing unit is used for testing a rear-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype by aiming at testing equipment of the digital control battery charging system to obtain an actual measurement waveform under a rated load condition;
and the efficiency testing unit is used for carrying out efficiency testing on the tested experimental prototype through testing equipment aiming at the digital control battery charging system to obtain an efficiency curve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a real object diagram of a prototype experimental test platform of a charging system.
FIG. 2 is a schematic diagram of a sample experiment.
FIG. 3 is an analysis graph of input characteristics under full load conditions for the interleaved parallel active power factor correction circuits.
Fig. 4 is a waveform diagram of the measured inductive current of the interleaved parallel active power factor correction circuit.
Fig. 5 is a graph of power factor PF versus output power.
Fig. 6 is a graph of total harmonic distortion rate THD as a function of output power.
Fig. 7 is a graph of measured waveforms under nominal load conditions.
Fig. 8 is a diagram of the effect of the leading arm to realize soft switching.
Fig. 9 is a diagram of soft switching effect of the hysteresis bridge arm.
Fig. 10 is a graph of efficiency for different output current conditions.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The battery charging system test equipment provided by the application is shown in fig. 1, and the specific equipment models are as follows:
programmable AC power supply: the adopted equipment model is PA9530 produced by NAUI company, which can simulate normal power supply of a power grid and can simulate several common abnormal power supply conditions in alternating current power supply, such as input overvoltage, undervoltage, frequency change and the like.
Electronic load: the load adopts IT8816B of ITECH company, not only can be set into four kinds of working modes of constant power, constant voltage, constant current and constant resistance, but also can simulate special working conditions such as load sudden change, short circuit and the like, and can read out the relevant data of the output end at the same time, the setting is flexible, and the measurement accuracy is high.
An oscilloscope: RTM3024 of RS company is adopted, and the model can simultaneously measure four analog models, the bandwidth is 200MHz, and the maximum sampling rate is 5G/S.
Other auxiliary devices: if a high-voltage differential isolation probe is needed in the debugging process, each path of voltage signal is measured by adopting DP6150A (1500V, 100MHz) of a company for public use, a CP8030H (30A, 100MHz) of a company for public use is adopted as a high-frequency current signal, a power analyzer Fluke 43B for measuring a power factor and THD is adopted, and a Fluke287C is adopted as a multimeter.
An experimental prototype: fig. 2 is an experimental prototype of the present application, which adopts a two-stage topology structure, the front stage is a staggered parallel APFC circuit, mainly realizing boosting and power factor correction, and the rear stage is an isolated phase-shifted full-bridge DC-DC circuit, mainly realizing wide-range voltage and current output, and satisfying the charging requirement.
Based on the above test equipment, the present application also provides a battery charging system test method based on digital control, including:
preceding stage APFC Experimental testing and analysis
Aiming at the requirements of a charging power supply on high power factor and network side current harmonic suppression effect, the APFC circuit with two staggered and parallel units is subjected to relevant test and analysis in the whole load range. The power factor and total harmonic distortion were measured by a power factor analyzer Fluke 43B, the input power was measured by a programmable ac source, and the output power was measured by an electronic load. The input characteristic analysis of the two-unit interleaved parallel APFC circuit under full load condition is shown in fig. 3.
As can be seen from a) in fig. 3, under the full load condition, the displacement factor DPF =1 and the power factor PF =1.0 of the two-unit interleaved parallel APFC circuit are limited by the accuracy of Fluke 43B, the PF value is understood to be close to 1, and the grid-side input current tracks the ac voltage in a shape close to a sine wave without phase difference, and the goal of power factor correction is reached. The results of the fourier analysis of the first 21 harmonics of the net side input current are shown in fig. 3 b), and the THD, i.e. the total harmonic distortion, of the net side input current is only 3.9%, with 3 rd and 5 th harmonics being the major harmonic components. From the data, the APFC circuit with two units connected in parallel in a staggered mode can meet the requirements of a rated charging power supply on power factors and the harmonic suppression effect of input current on a network side.
The waveform of the inductive current tested under the condition of full load of the APFC circuit with two units connected in parallel in an interlaced mode is shown in figure 4, the voltage of two ends of a resistor connected with a current Hall sensor is detected for each path of inductive current and the total current, and the inductive current is simulated by the voltage value.
As can be seen from fig. 4 a) shows two paths of inductive currents and a total superimposed inductive current, the two Boost circuits both work in an inductive current continuous mode and are sinusoidal half waves, the two paths of currents have equal magnitudes, and the current equalizing effect is good, the maximum average value of the total inductive current under a rated load condition is about 18A, the maximum peak value of the total ripple is about 1.6A, the current fluctuation is about 8.9%, and is less than the design allowable current fluctuation rate by 10%, which indicates that the inductor is reasonable in design. In fig. 4, b), 4 c) and d) of the diagram are current waveform amplification of a) of fig. 4, and it can be seen that the total current ripple is doubled to 140kHz after the single-path operating frequency is 70kHz and the two paths of inductive currents are superposed, and the total current ripple amplitude is also reduced. As can be seen from b) of fig. 4, when the duty ratio is equal to 50%, the two inductor current ripples are completely cancelled to become zero after being superimposed. It can also be seen from c) of fig. 4 and d) of fig. 4 that at the single-pass duty cycles of 70% and 30%, the total current ripple is also reduced by nearly 50%, consistent with theoretical analysis. The data show that the two-unit interleaving APFC circuit is reasonable in design.
Since the output power of the battery is different in each stage from the beginning to the end of charging, and the front-stage APFC circuit is required to have a good power factor correction effect in the whole charging process, it is necessary to ensure that the power factor and the total harmonic distortion rate in the whole load range have good characteristics. Therefore, under different load conditions, the power factor PF and the total harmonic distortion THD of the charging system are respectively tested, and the variation curves of the power factor PF and the total harmonic distortion THD with the output power are respectively drawn as shown in fig. 5 and fig. 6.
As can be seen from fig. 5, the power factor PF has reached 0.98 at an input power of 500W, the power factor has reached 0.99 or more at an input power of approximately 900W, and the power factor PF shows a rising trend with an increase in output power and reaches 1.0 at an output power of 1.7 kW. As can be seen from fig. 6, the total harmonic distortion rate THD is decreased with the increase of the output power, and when the input power is increased from 600W to 2.4kW, the THD is correspondingly decreased from 8% to 3.7%. Below 600W, although THD is large, the low power period is short in duration and does not cause serious pollution to the grid during the entire charging process. The main output power interval of the charging system is [1.2kW,2.4kW ], the THD in the interval is very small, and the power factor correction effect is good, so that the harmonic pollution to a power grid caused by the battery charging system designed by the application is considered to be small.
Later stage DC-DC converter experimental test and analysis
The rear-stage isolation type charging conversion circuit adopts a phase-shifted full-bridge ZVS PWM converter with a clamping diode. The digital control chip judges the charging state by detecting the battery voltage and the charging current, and adjusts the output voltage and the output current of the phase-shifted full-bridge ZVS PWM conversion circuit on line according to the three-stage charging curve. The main operating waveforms of the converter circuit in full load condition are shown in fig. 7. Wherein Q 1 And Q 4 Driving signals i of MOS tube on leading bridge arm and MOS tube under lagging bridge arm in full bridge circuit Lr For the current of the added resonant inductor, i p Is the primary current of the transformer; i all right angle D7 And i D8 Are respectively two pliersThe current of the bit diode; v D6 Outputting reverse voltage at two ends of the rectifier diode for a secondary side; v rect And outputs rectified voltage for the secondary side.
As can be seen in FIG. 7, Q is diagonally located 1 And Q 4 Phase-shifted operation, resonant inductor current i Lr And the primary side current i of the transformer p There is a time difference which flows right through the clamping diode D 7 And D 8 . Under rated load conditions, the clamping diode D 7 、D 8 When the clamp is conducted, the peak value of the current flowing through the clamp is smaller than 3A, the duration is short, and each diode is only conducted once in each period, so that the loss is reduced, and the efficiency is improved; reverse voltage spike and oscillation on the secondary output rectifier diode of the transformer are effectively inhibited, and the diode with lower voltage resistance value can be selected as the voltage spike is lower than 100V.
The realization effect of the soft switch is one of the most key performance indexes of the phase-shifted full-bridge ZVS PWM converter. According to the working process of the converter, the turn-off process of the four switching tubes is certainly zero-voltage turn-off, so that the waveform of the turn-on process can be tested. The conditions for realizing soft switching of front and rear bridge arms of the phase-shifted full-bridge ZVS PWM converter are different, and ZVS is difficult to realize under the condition of light load, so that the load condition is explained while the soft switching effect is analyzed.
Under the condition of quarter rated load, the leading bridge arm achieves the soft switching effect as shown in fig. 8. It can be seen that the voltage between its drain and source stages has dropped to zero before the drive signal occurs, just achieving a zero voltage soft switch. The soft switching of the lag bridge arm is more difficult than that of the lead bridge arm. Therefore, under the load condition that the leading bridge arm just can realize the zero-voltage soft switching, the lagging bridge arm cannot realize the zero-voltage soft switching. Under the condition of one-half rated load, the soft switching effect of the hysteresis bridge arm is realized as shown in fig. 9. Therefore, when the load is heavier, the hysteresis bridge arms realize zero-voltage soft switching, and therefore it can be judged that the front bridge arm and the rear bridge arm can well realize zero-voltage soft switching in a main power interval of the charging power supply.
Charging system overall efficiency test and analysis
Fig. 10 is an efficiency curve of a prototype charging power supply designed according to this project. As can be seen from fig. 10, the efficiencies of the charging power sources are all above 90% in the main load range, with the power interval of [1.2kw,2.4kw ] for efficiencies greater than 92%. The maximum efficiency of the whole machine is 95.8%, and under the condition of full load, the efficiency of the whole machine is about 94%, so that the requirement of a charging power supply on the efficiency can be met.
Based on the same inventive concept, the embodiment of the present application further provides a testing apparatus for a digitally controlled battery charging system, which can be used to implement the method described in the above embodiment, as described in the following embodiments. Because the principle of solving the problems of the testing device for the digital control battery charging system is similar to that of the testing method for the digital control battery charging system, the implementation of the testing device for the digital control battery charging system can refer to the implementation of the testing method for the digital control battery charging system, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. While the system described in the embodiments below is preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
The application provides a testing arrangement to digital control battery charging system includes:
the pre-stage test unit is used for testing a pre-stage APFC circuit of a tested experimental prototype in the whole load range by using test equipment aiming at a digital control battery charging system to obtain an input characteristic analysis result of the two-unit staggered parallel APFC circuit under a full-load condition;
the design evaluation unit is used for determining whether the design of the APFC circuit with two units connected in parallel in a staggered mode is reasonable or not according to the input characteristic analysis result;
the rear-stage testing unit is used for testing a rear-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype by aiming at testing equipment of the digital control battery charging system to obtain an actual measurement waveform under a rated load condition;
and the efficiency testing unit is used for carrying out efficiency testing on the tested experimental prototype through testing equipment aiming at the digital control battery charging system to obtain an efficiency curve.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
An embodiment of the present application further provides a specific implementation manner of an electronic device, which is capable of implementing all steps in the method in the foregoing embodiment, where the electronic device specifically includes the following contents:
a processor (processor), a memory (memory), a communication Interface (Communications Interface), and a bus;
the processor, the memory and the communication interface complete mutual communication through the bus;
the processor is configured to call a computer program in the memory, and the processor implements all the steps of the method in the above embodiments when executing the computer program, for example, the processor implements the following steps when executing the computer program:
testing a preceding stage APFC circuit of a tested experimental prototype in the whole load range by using test equipment aiming at a digital control battery charging system to obtain an input characteristic analysis result of the two-unit staggered parallel APFC circuit under a full-load condition;
determining whether the design of the two-unit staggered parallel APFC circuit is reasonable or not according to the input characteristic analysis result;
testing a rear-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype by testing equipment of a digital control battery charging system to obtain an actually measured waveform under a rated load condition;
and carrying out efficiency test on the tested experimental prototype by aiming at the test equipment of the digital control battery charging system to obtain an efficiency curve.
Embodiments of the present application also provide a computer-readable storage medium capable of implementing all the steps of the method in the above embodiments, where the computer-readable storage medium stores thereon a computer program, and the computer program when executed by a processor implements all the steps of the method in the above embodiments, for example, the processor implements the following steps when executing the computer program:
testing a front-stage APFC circuit of a tested experimental prototype in the whole load range by using test equipment aiming at a digital control battery charging system to obtain an input characteristic analysis result of a two-unit staggered parallel APFC circuit under a full load condition;
determining whether the design of the APFC circuit with two units connected in parallel in a staggered mode is reasonable or not according to the input characteristic analysis result;
testing a rear-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype by testing equipment of a digital control battery charging system to obtain an actually measured waveform under a rated load condition;
and carrying out efficiency test on the tested experimental prototype by using the test equipment aiming at the digital control battery charging system to obtain an efficiency curve.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the hardware + program class embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment. Although the embodiments herein provide method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or end product executes, it may execute sequentially or in parallel (e.g., parallel processors or multi-threaded environments, or even distributed data processing environments) according to the method shown in the embodiment or the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded. For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the embodiments of the present description, the functions of each module may be implemented in one or more software and/or hardware, or a module implementing the same function may be implemented by a combination of multiple sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
As will be appreciated by one skilled in the art, embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein. The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the system embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the specification.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and alterations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the claims of the embodiments of the present specification.

Claims (10)

1. A test apparatus for a digitally controlled battery charging system, comprising: the device comprises a programmable alternating current power supply, electronic load equipment, an oscilloscope, auxiliary equipment and a tested experimental prototype;
the tested experimental prototype is electrically connected with the programmable alternating current power supply, and the programmable alternating current power supply supplies power to the testing equipment;
the electronic load equipment, the oscilloscope and the auxiliary equipment are all electrically connected with the tested experimental prototype.
2. The test equipment for a digitally controlled battery charging system according to claim 1, wherein the auxiliary equipment includes a high voltage differential isolation probe, a high frequency current signal sensor, a power meter analyzer and a multimeter.
3. The test equipment for the digitally-controlled battery charging system according to claim 1, wherein the experimental prototype to be tested is of a two-stage topology structure, the front stage is a staggered parallel APFC circuit which mainly realizes boosting and power factor correction, and the rear stage is an isolated phase-shifted full-bridge DC-DC circuit.
4. The test equipment for a digitally controlled battery charging system according to claim 3, wherein said APFC circuit is connected in parallel with said DC/DC circuit;
the APFC circuit comprises an APFC converter and an APFC controller, and the APFC controller is used for controlling the APFC converter;
the DC/DC circuit comprises a DC/DC converter and a DC/DC controller, and the DC/DC controller is used for controlling the DC/DC converter.
5. The test equipment for the digitally controlled battery charging system of claim 4, wherein the control mode adopted by the APFC controller is an average current control mode in an inductor current continuous conduction mode.
6. The test equipment for digitally controlled battery charging systems according to claim 5, wherein the DC/DC circuit is based on a phase-shifted full bridge converter with 2 clamping diodes and 1 resonant inductor on either side of the transformer, which is connected to a hysteresis bridge arm.
7. A method of testing a digitally controlled battery charging system, comprising:
testing the front-stage APFC circuit of the tested experimental prototype in the whole load range by using the testing equipment aiming at the digital control battery charging system to obtain an input characteristic analysis result of the two-unit staggered parallel APFC circuit under the full load condition;
determining whether the design of the APFC circuit with two units connected in parallel in a staggered mode is reasonable or not according to the input characteristic analysis result;
testing a post-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype through the testing equipment aiming at the digital control battery charging system to obtain an actually measured waveform under a rated load condition;
and carrying out efficiency test on the tested experimental prototype through the test equipment aiming at the digital control battery charging system to obtain an efficiency curve.
8. A test apparatus for a digitally controlled battery charging system, comprising:
the front-stage test unit is used for testing the front-stage APFC circuit of the tested experimental prototype in the whole load range by using the test equipment aiming at the digital control battery charging system to obtain an input characteristic analysis result of the two-unit staggered parallel APFC circuit under the full load condition;
the design evaluation unit is used for determining whether the design of the APFC circuit in the two units in the staggered parallel connection mode is reasonable or not according to the input characteristic analysis result;
the rear-stage testing unit is used for testing a rear-stage isolated phase-shifted full-bridge DC-DC circuit of a tested experimental prototype through the testing equipment aiming at the digital control battery charging system to obtain an actual measurement waveform under a rated load condition;
and the efficiency testing unit is used for carrying out efficiency testing on the tested experimental prototype through the testing equipment aiming at the digital control battery charging system to obtain an efficiency curve.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method for testing a digitally controlled battery charging system of claim 7 are carried out when the program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the testing method for a digitally controlled battery charging system of claim 7.
CN202210771008.2A 2022-06-30 2022-06-30 Test method of battery charging system based on digital control Pending CN115166571A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4357797A1 (en) * 2022-10-17 2024-04-24 Cinergia Power Solutions, S.L. System for testing electrical products in a closed circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4357797A1 (en) * 2022-10-17 2024-04-24 Cinergia Power Solutions, S.L. System for testing electrical products in a closed circuit

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