EP4222851A1 - Gleichspannungswandler mit stromsensoranordnung - Google Patents
Gleichspannungswandler mit stromsensoranordnungInfo
- Publication number
- EP4222851A1 EP4222851A1 EP21794715.9A EP21794715A EP4222851A1 EP 4222851 A1 EP4222851 A1 EP 4222851A1 EP 21794715 A EP21794715 A EP 21794715A EP 4222851 A1 EP4222851 A1 EP 4222851A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- converter
- current
- converter units
- control unit
- designed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 29
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000004913 activation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
-
- 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
- H02M3/285—Single converters with a plurality of output stages connected in parallel
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/77—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means arranged for operation in parallel
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the invention relates to a DC voltage converter with a current sensor arrangement and a cell tester with a DC voltage converter of this type.
- Controlled DC voltage converters for converting an input DC voltage into one or more temporally variable output DC voltages using switched converter units with electronically controllable half bridges are known from the prior art.
- An electronic control unit ensures the synchronous activation of the converter units by switching the half bridges on and off using a modulation method, for example pulse width modulation (PWM), with a variable period and a variable duty cycle.
- PWM pulse width modulation
- the semiconductor switches of the half-bridges switch the input DC voltage on and off with a high switching frequency;
- a downstream filter arrangement smoothes the generated voltage pulse and converts it into the desired DC output voltage.
- the switching frequency is far above the mains frequency and usually above 20 kHz.
- the DC output voltage can be less than or greater than the DC input voltage and can have the same or different polarity.
- the object of the invention is therefore to solve these problems and to provide an electrical DC voltage converter and a cell tester that is able to generate highly dynamic DC voltages over time and to measure the currents transmitted with constant and high accuracy over a very wide measuring range .
- a DC-DC converter according to the invention is designed to convert an input DC voltage Vi into at least one variable output DC voltage V out and comprises at least two switched converter units, each with at least one electronically controllable half-bridge, and a control unit, which is used to control the half-bridges in a modulation method with a variable period and a variable duty cycle is formed.
- a dedicated current sensor is provided in each of the output lines of the switched converter units.
- the control unit is designed to receive the current intensities of the converter units measured by the current sensors and to control the converter units with duty cycles that differ from one another.
- the control unit can activate individual converter units with duty cycles that are reduced compared to other converter units.
- the control unit can also be designed not to activate individual converter units, ie with a pulse duty factor of zero. According to the invention, the control unit therefore controls the proportion of the total electrical current transmitted that is transmitted via the respective converter units.
- the output lines of the converter units are preferably connected together after the current sensors. This ensures that the currents of the output lines add up.
- the control unit can be designed to calculate the total current lout by querying the current sensors. Any number of converter units and associated output lines can be provided. The control unit calculates the total current as the sum of all currents in the output lines.
- control unit can adapt the modulation method in such a way that precisely those converter units are activated whose associated current sensors have the minimum measurement error for the relevant current strength of the total current. As a result, a minimum measurement error is achieved for the total total current without it being necessary to switch measurement ranges. Instead of switching measuring ranges, the control unit activates those converter units whose assigned current sensors have the appropriate nominal current.
- control unit can be designed to activate the converter units as a function of the calculated total current lout or as a function of a target value Isoii for the total current.
- control unit can already know in advance the total current to be transmitted and can activate in advance exactly those converter units whose associated current sensors will lead to the smallest measurement error for this desired value.
- the current sensors can each have the same nominal currents IN, IN 1 .
- the current sensors can have different nominal currents IN, IN 1 .
- a specific scale accuracy (full-scale accuracy) in this measuring range is associated with the nominal current of a current sensor.
- the measurement error to be expected in absolute terms from a current sensor with a high nominal current is therefore generally higher than that of a current sensor with a low nominal current.
- the current sensors can each have a low-impedance electrical shunt resistor and a voltmeter.
- the current sensors can have measuring resistors Rm, Rm', the resistance values of which differ by a factor of at least 5, for example by a factor of 10 to 20.
- the resistance value Rm of a first current sensor can be about 100 p ⁇ and the resistance value Rm' of a second current sensor can be about 2 m ⁇ .
- the current sensors can also have a magnetic circuit for inductive current measurement. The invention is not limited to specific current measurement mechanisms.
- the control unit can be designed to compare the total current lout with the nominal currents IN, IN 1 ZU and to activate the converter unit whose associated current sensor has a nominal current that is greater than the total current but is closest to the total current. This is advantageous when the total current is less than a rated current of a single current sensor.
- the control unit can also be designed to compare the total current lout with the nominal currents IN, IN 1 ZU and to activate those converter units whose total nominal current is greater than the total current but is closest to the total current. This is advantageous when the total current is greater than each individual nominal current of the current sensors. This ensures that the current strengths in the output lines of the activated converter units are below, but as close as possible to the rated current IN, IN 1 of the associated current sensors. As a result, the measuring ranges of the current sensors used are utilized as far as possible in order to reduce the measurement error to be expected.
- At least one of the converter units can have two, three, four or more half-bridges whose outputs are interconnected to form their common output line via interleaving chokes, which can be current-compensated in particular.
- Each of the half-bridges can include two controlled semiconductor switches or one controlled semiconductor switch and a diode, with the semiconductor switches preferably being in the form of SiC or GaN transistors, and with several of these transistors possibly being connected in parallel.
- the converter units can be integrated in a common converter assembly.
- the control unit can be designed to the half bridges when using SiC transistors with a switching frequency of up to 200 kHz, for example 24 kHz, 33 kHz, or 75 kHz, and when using GaN transistors with a switching frequency of up to to control 2.5 MHz.
- LC filter arrangements can be arranged in the output lines of the converter units, which are designed as low-pass filters with cut-off frequencies above the frequency of the useful signal to be provided, preferably a cut-off frequency above 30 kHz, for example about 60 kHz, up to more than 150 kHz.
- Filter chokes can be provided in the LC filter arrangements, which have an inductance in the range of approximately 150 nH to 300 nH each.
- the current sensors can have rated currents IN, IN 1 in the range of approximately 50 A, 175 A, 300 A, 600 A or 700 A, for example.
- the measurement accuracies of the current sensors can be, for example, in the range of approximately +/-0.005%, +/-0.01% or +/-0.05%, based on their nominal currents IN, IN 1 .
- a DC-DC converter according to the invention can have a first measurement channel with low measurement accuracy and high dynamics, for example approximately 1 MHz, and a second measurement channel with high measurement accuracy and low dynamics, for example approximately 10 Hz, in which case the control unit can be designed for sequential or simultaneous querying of both measurement channels .
- the two measurement channels can be separate from one another, but the two measurement channels can also be integrated in the respective current sensors.
- the current sensors can each have a shunt resistor for measuring the voltage drop and two associated voltage amplifiers and two downstream A/D converters for measuring and digitizing the voltage drop in two measurement channels.
- the current sensors can be thermally conductively connected to cooling elements, for example Peltier elements or liquid cooling bodies, and/or to heating elements, for example heating resistors, for thermal conditioning, for example to ensure a temperature of the current sensors of about 50°C.
- cooling elements for example Peltier elements or liquid cooling bodies
- heating elements for example heating resistors
- thermal conditioning for example to ensure a temperature of the current sensors of about 50°C.
- a DC-DC converter according to the invention can have an internal galvanic isolation for separating the input DC voltage Vi from the output DC voltage Vout, for example a transformer.
- the invention also relates to a cell tester for testing one or more electric battery cells or fuel cells, comprising a DC voltage converter according to the invention.
- cell tester includes any device for testing electrical energy stores or fuel cells, in particular devices for testing individual cells, a plurality of cells, individual or multiple battery packs, or entire electric batteries.
- a mains converter with electrical isolation for example a transformer, can be provided to provide the input direct voltage Vi.
- FIG. 1a shows a schematic block diagram of an embodiment of a cell tester according to the invention
- FIG. 1b shows a schematic circuit diagram of an embodiment of a DC-DC converter according to the invention
- FIG. 1c shows a schematic circuit diagram of a further embodiment of a DC-DC converter according to the invention.
- FIG. 1d shows a schematic circuit diagram of a further embodiment of a DC-DC converter according to the invention.
- FIG. 1a shows a schematic block diagram of an embodiment of a cell tester according to the invention.
- the cell tester is designed to test one or more electric battery cells 8, 8', which can be part of a common battery module, for example, and includes two DC-DC converters 1, T according to the invention.
- the DC-DC converters 1, T are supplied with the input voltage Vi by a common network converter 10.
- the network converter 10 is connected to the 3-phase supply network and is provided with a galvanic isolation, for example an internal transformer.
- the DC voltage converters 1, T generate DC voltages V out , V out ′, which are independent of one another and vary highly dynamically in the amplitude and frequency range, for testing the battery cells 8 , 8 ′.
- a control unit 4 is connected to the two DC/DC converters 1, T via a data line (shown schematically) and obtains the supplied current or voltage values from them. Furthermore, the control unit 4 is connected to the converter units of the DC voltage converters 1, T via control lines.
- each DC-DC converter 1, 1' includes an internal electrical isolation. This is particularly advantageous when the battery cells 8, 8' to be tested are electrically connected, for example when they are part of a common battery pack.
- Fig. 1b shows a schematic circuit diagram of an embodiment of a DC-DC converter 1 according to the invention.
- the DC-DC converter 1 comprises two switched converter units 2, 2', each with an electronically controllable half-bridge 3, 3', and an electronic control unit 4, which is used to control the half-bridges 3, 3 'is formed in a modulation method with a variable period and a variable duty cycle.
- a dedicated current sensor 6, 6' is provided in each of the output lines 5, 5' of the converter units 2, 2'.
- the control unit 4 is designed to use the current intensities I2, of the converter units 2, 2' via schematically indicated data lines and to process them.
- the output lines 5, 5' of the converter units 2, 2' are connected together after the current sensors 6, 6', so that the currents of the output lines 5, 5' add up.
- the control unit 4 is also designed to control the converter units 2, 2' with pulse duty factors that differ from one another.
- the control unit can therefore activate the converter unit 2 with a reduced pulse duty factor compared to the converter unit 2', or not activate one of the converter units 2, 2' at all. This takes place as a function of the calculated total current lout or a target value Isoii of the total current lout.
- the scale error of the current sensors is 0.01% in each case.
- the control unit only activates the second converter unit 2' in order to limit the measurement error to +/-30 mA.
- the first converter unit 2 is activated and the second converter unit 2' deactivated in order to limit the measurement error to +/- 60 mA.
- the control unit activates both the first converter unit 2 and the second converter unit 2'.
- the first converter unit 2 can be activated with a duty cycle that is reduced compared to the second converter unit 2' in order to fully utilize the second current sensor 2' with a measuring current of 300 A and to load the first current sensor 2 less.
- both converter units 2, 2' are finally activated with the same duty cycle.
- the scale error of the current sensors is 0.01% in each case.
- the control unit only activates the first converter unit at a total current of 0A to 300 A in order to limit the measurement error to +/- 30 mA.
- the second converter unit With a total current of 300 A to 600 A, the second converter unit is also activated in order to limit the measurement error to +/- 60 mA.
- the control unit also activates the third converter unit in order to limit the measurement error to +/- 90 mA.
- Interleaving chokes 7, 7' are provided in the output lines 5, 5' of the converter units 2, 2'.
- Each of the half-bridges 3, 3' comprises two controlled semiconductor switches which are in the form of SiC transistors, a number of these transistors being connected in parallel to form a semiconductor switch.
- the converter units 2, 2' are integrated in a common converter assembly 8. In this exemplary embodiment, the switching frequency is approximately 75 kHz.
- LC filter arrangements 9, 9' are arranged in the output lines 5, 5' of the converter units 2, 2', which are designed as low-pass filters with limit frequencies above the frequency of the useful signal to be provided, namely about 45 kHz here.
- FIG. 1c shows a schematic circuit diagram of a further embodiment of a DC-DC converter according to the invention.
- This exemplary embodiment corresponds to that from FIG. 1b with the difference that the first converter unit 2 has three half-bridges 3, 3a, 3b connected in parallel, the outputs of which are connected together via interleaving chokes 7, 7a, 7b.
- current sensors 6, 6' are provided in the two output lines 5, 5'.
- a first measuring channel 11 with low measuring accuracy and high dynamics, for example around 1 MHz, and a second measuring channel 1 T with high measuring accuracy and low dynamics, for example around 10 Hz, are provided, with the control unit 4 for querying both measuring channels 11, 1 T is trained.
- the current sensors 6, 6' make the second measurement channel 1T available; on the other hand, separate, schematically indicated current sensors are provided for the first measuring channel 11 .
- FIG. 1d shows a schematic circuit diagram of a further embodiment of a DC-DC converter according to the invention.
- This exemplary embodiment corresponds to that from FIG. 1c with the difference that the current sensors 6, 6' each provide a first measuring channel 11 and a second measuring channel 1T.
- two schematically indicated voltage measuring devices are arranged in the current sensors 6, 6', for example in the form of separate voltage amplifiers with different limit frequencies and A/D converters.
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- Dc-Dc Converters (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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ATA50834/2020A AT524279B1 (de) | 2020-09-29 | 2020-09-29 | Gleichspannungswandler mit Stromsensoranordnung |
PCT/AT2021/060349 WO2022067364A1 (de) | 2020-09-29 | 2021-09-28 | Gleichspannungswandler mit stromsensoranordnung |
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EP4222851A1 true EP4222851A1 (de) | 2023-08-09 |
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EP21794715.9A Pending EP4222851A1 (de) | 2020-09-29 | 2021-09-28 | Gleichspannungswandler mit stromsensoranordnung |
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US (1) | US20230369981A1 (de) |
EP (1) | EP4222851A1 (de) |
JP (1) | JP2023543256A (de) |
KR (1) | KR20230074578A (de) |
CN (1) | CN116325463A (de) |
AT (1) | AT524279B1 (de) |
WO (1) | WO2022067364A1 (de) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US6795009B2 (en) * | 2002-09-09 | 2004-09-21 | Primarion, Inc. | System and method for current handling in a digitally-controlled power converter |
TW201008122A (en) * | 2008-08-07 | 2010-02-16 | Richtek Technology Corp | Current balancing device and method for a multi-phase power converter with constant working time control |
CN201369679Y (zh) * | 2009-03-10 | 2009-12-23 | 东南大学 | 电力线路用电子变压器 |
AT511520B1 (de) * | 2012-05-24 | 2017-06-15 | Avl List Gmbh | Verfahren und eine Vorrichtung zur Prüfung des Antriebsstranges von zumindest teilweise elektrisch betriebenen Fahrzeugen |
US9240721B2 (en) * | 2012-07-12 | 2016-01-19 | Infineon Technologies Austria Ag | Multiphase digital current mode controller with dynamic current allocation |
DE102012106262A1 (de) * | 2012-07-12 | 2014-01-16 | Hella Kgaa Hueck & Co. | Mehrphasen-Gleichspannungswandler |
EP2863528B1 (de) * | 2013-10-16 | 2018-07-25 | Siemens Aktiengesellschaft | Einsatz eines Wechselrichters als Gleichstrom-Wander |
DE112015002622T5 (de) * | 2014-06-03 | 2017-02-23 | Murata Manufacturing Co., Ltd. | Multiphasen-Gleichspannungswandler und Multiphasen-Gleichspannungswandlersystem |
DE102015200716A1 (de) * | 2015-01-19 | 2016-07-21 | Efficient Energy Gmbh | Schaltnetzteil |
US10063146B1 (en) * | 2017-03-31 | 2018-08-28 | Alpha And Omega Semiconductor (Cayman) Ltd. | Full-time inductor current monitoring method by sensing low side switch |
-
2020
- 2020-09-29 AT ATA50834/2020A patent/AT524279B1/de active
-
2021
- 2021-09-28 CN CN202180066851.4A patent/CN116325463A/zh active Pending
- 2021-09-28 KR KR1020237014329A patent/KR20230074578A/ko unknown
- 2021-09-28 WO PCT/AT2021/060349 patent/WO2022067364A1/de unknown
- 2021-09-28 US US18/029,140 patent/US20230369981A1/en active Pending
- 2021-09-28 EP EP21794715.9A patent/EP4222851A1/de active Pending
- 2021-09-28 JP JP2023519168A patent/JP2023543256A/ja active Pending
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KR20230074578A (ko) | 2023-05-30 |
US20230369981A1 (en) | 2023-11-16 |
AT524279A1 (de) | 2022-04-15 |
AT524279B1 (de) | 2023-02-15 |
JP2023543256A (ja) | 2023-10-13 |
WO2022067364A1 (de) | 2022-04-07 |
CN116325463A (zh) | 2023-06-23 |
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