WO2021157989A1 - Method for preheating an intermediate circuit capacitance - Google Patents

Method for preheating an intermediate circuit capacitance Download PDF

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Publication number
WO2021157989A1
WO2021157989A1 PCT/KR2021/001331 KR2021001331W WO2021157989A1 WO 2021157989 A1 WO2021157989 A1 WO 2021157989A1 KR 2021001331 W KR2021001331 W KR 2021001331W WO 2021157989 A1 WO2021157989 A1 WO 2021157989A1
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Prior art keywords
intermediate circuit
partial
circuit capacitance
partial capacitances
preheating
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PCT/KR2021/001331
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English (en)
French (fr)
Inventor
Magnus Böh
The Binh Lai
Stephan Werker
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Hanon Systems
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Publication of WO2021157989A1 publication Critical patent/WO2021157989A1/en

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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
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
    • 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
    • H02M1/36—Means for starting or stopping 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
    • 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
    • H02M7/5375—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 with special starting equipment

Definitions

  • the invention relates to a method for preheating an intermediate circuit capacitance, which is made up of a plurality of parallel-connected partial capacitances in an intermediate circuit of an inverter.
  • inverters which are also referred to as DC to AC converters, convert an input-side direct voltage into an output-side alternating voltage, with which, for example, an electric motor is operated.
  • an electric motor can, for example, be a permanent magnet synchronous motor which is used in an electric coolant compressor in a vehicle.
  • a very common circuit arrangement for a regulated drive of electric drives by means of an inverter is a so-called B6 bridge or B6 bridge circuit.
  • the B6 bridge comprises three half bridges, consisting of a high-side power switch and a low-side power switch each, said power switches or semiconductor power switches being designed, for example, as a MOSFET (English: metal-oxide-semiconductor field-effect transistor) or IGBT (English: insulated-gate bipolar transistor).
  • MOSFET metal-oxide-semiconductor field-effect transistor
  • IGBT Insul-gate bipolar transistor
  • a connection of the high-side power switch is directly connected to a connection of the low-side power switch as well as an output of the half bridge or the inverter.
  • the voltage of a phase (X or Y or Z) generated by the half bridge is output via this output, for example to operate a connected electric motor.
  • a so-called intermediate circuit capacitance is connected to the input-side DC voltage, for example the terminals or potentials HV+ and HV-, and in parallel with the half bridges of the inverter.
  • such an intermediate circuit capacitance consists of a plurality of partial capacitances or capacitors, such as, for example, film capacitors or electrolytic capacitors, which are connected in parallel to one another in order to provide an intermediate circuit capacitance with a higher capacitance value.
  • partial capacitances or capacitors such as, for example, film capacitors or electrolytic capacitors
  • the capacitance values of the partial capacitances or capacitors in the parallel connection add up and, in their sum, result in the capacitance value of the intermediate circuit capacitance.
  • partial capacitances or capacitors In addition to this parallel connection of the partial capacitances or capacitors, it is also possible to arrange partial capacitances or capacitors additionally in a series connection. By means of such an additional series connection of the partial capacitances or capacitors, the total voltage across the intermediate circuit capacitance can be divided between the partial capacitances or capacitors arranged in the series connection, thereby reducing the dielectric strength requirements of the partial capacitances or capacitors. In the following, only the term partial capacitance will be used for the terms partial capacitances or capacitors.
  • Electrolytic capacitors are therefore used preferably, which, however, have poor characteristics at low temperatures, in particular below 0 o C. This includes a decreasing nominal capacitance and a strong dispersion of the impedance of the electrolytic capacitors.
  • each partial capacitance has a serial parasitic resistance R 1 , R 2 , ..., R 6 (series resistance; ESR; Equivalent Series Resistance) in addition to its actual ideal capacitance C 1 , C 2 , ..., C 6 in an associated equivalent circuit diagram.
  • R 1 , R 2 , ..., R 6 series resistance; ESR; Equivalent Series Resistance
  • ESR Equivalent Series Resistance
  • the ideal capacitance C 1 and the serial parasitic resistance R 1 belong to the first partial capacitance
  • the ideal capacitance C 2 and the serial parasitic resistance R 2 belong to the second partial capacitance, and so on.
  • the ideal capacitances C 1 , C 2 and C 3 can be arranged in parallel to one another and in a series connection with the ideal capacitances C 4 , C 5 and C 6 , which are also arranged in parallel to one another, and thus make up the intermediate circuit capacitance.
  • electrolytic capacitors used as partial capacitances have strong dispersions in their impedance, that is to say, in their resistance, when operated with an alternating voltage.
  • the partial capacitances arranged in the intermediate circuit capacitance have different current loads.
  • the partial capacitance with the lowest impedance is loaded with the highest current, while the partial capacitance with the highest impedance is loaded with the lowest current.
  • This increased current load of the partial capacitance can lead to an impermissible current load on the capacitor component and thus to faster aging and/or failure of the component.
  • the method is intended to be used in particular for intermediate circuit capacitances in inverters.
  • the parallel-connected partial capacitances of the intermediate circuit capacitance are charged and discharged by means of an alternating current I with a selected frequency f. Both the frequency f and the amplitude of the alternating current I are actively influenced by the present method. This charging or discharging process of the partial capacitances does not have to be carried out until the partial capacitances have been fully charged or discharged.
  • the frequency f of the alternating current I is selected such that it is in a frequency range in which the dispersion of the impedances of the partial capacitances is low.
  • a range for the frequency f of the alternating current I is, for example, between 10 Hz to 500 Hz. In particular, such a range can be between 20 Hz to 300 Hz or between 30 Hz to 150 Hz.
  • the partial capacitances can be heated up much more uniformly by an alternating current I with a frequency f less than 500 Hz.
  • the partial capacitances can be heated up uniformly in the preheating phase according to the invention.
  • the preheating phase is completed when the temperature in the partial capacitances is in a range between -5 o C and 0 o C.
  • the assembly in which the intermediate circuit capacitance is used such as for example an inverter, is operated in its operating phase.
  • the end of the preheating phase can be timed.
  • times or a time period t for the necessary duration of the preheating phase can be determined at different outside or ambient temperatures and stored in a memory of a central control unit which controls the method for preheating an intermediate circuit capacitance.
  • the central control unit can read out the corresponding value from its memory and control the time period t of the preheating phase.
  • the temperature in the partial capacitances, such as electrolytic capacitors drops below 0 o C, for example, another preheating phase, i.e. before the next operating phase, can be provided.
  • a control voltage comprising three phases is generated for an electric motor, controlled by a central control unit.
  • an electric motor can be used, for example, in an electric coolant compressor in a vehicle.
  • an alternating current I with a specific frequency f is also generated, for example, in each case.
  • an operating frequency of an inverter that controls an electric motor is in a frequency range from 20 kHz to 30 kHz.
  • the half bridges of the inverter are used to generate the alternating current I with a frequency f less than 500 Hz in the preheating phase.
  • a frequency f less than 500 Hz in the preheating phase.
  • two low-side power switches can be switched through in two half bridges, while the associated high-side power switches of these half-bridges are blocked.
  • This drive takes place, for example, by means of the central control unit.
  • the high-side power switch of the third half-bridge is driven with a clock which corresponds to the specific frequency f in a range less than 500 Hz.
  • the alternating current I flows through the coils L 1 , L 2 and L 3 of the electric motor, which are arranged in a star connection and used as inductors.
  • the inverter is operated as a step-down converter or in a so-called "buck converter mode".
  • the high-side power switch of the third half bridge is switched through, the partial capacitances of the intermediate circuit capacitance are discharged, while they are charged in the event that the high-side power switch of the third half bridge is blocked, since the intermediate circuit capacitance as well as the half bridges are arranged between the potentials HV+ and HV-.
  • This example can be varied in a suitable manner by a skilled person, with another high-side power switch or low-side power switch being driven accordingly to generate the alternating current I.
  • the alternating current I can be adapted to the desired load, i.e. the intermediate circuit capacitance.
  • a higher frequency f results in a lower motor and capacitor current, while a lower frequency f results in a higher motor and capacitor current.
  • the partial capacitances of the intermediate circuit capacitance are heated up uniformly and thus also loaded uniformly in the operating phase, which prevents an impermissibly high capacitor current. This leads to a longer service life of the components and the entire arrangement, such as an inverter. Moreover, the current and voltage ripple of the intermediate circuit is decreased.
  • Another advantage is that no additional hardware expenditure is necessary to carry out the present method for preheating an intermediate circuit capacitance.
  • the method can be controlled by means of the existing central control unit, which controls the inverter in its operating phase and thus the electric motor.
  • the course of the present method is controlled by the central control unit by means of an appropriate software for realizing the preheating phase.
  • Fig. 1 shows an equivalent circuit diagram for an intermediate circuit capacitance consisting of six partial capacitances
  • Fig. 2a shows an illustration of a time profile of partial currents in the partial capacitances at a first point in time
  • Fig. 2b shows an illustration of a time profile of partial currents in the partial capacitances at a later second point in time
  • Fig. 3 shows an arrangement for implementing the method for preheating an intermediate circuit capacitance
  • Fig. 4 shows an illustration of a time profile of an alternating current I for preheating an intermediate circuit capacitance with different frequencies f,
  • Fig. 5 shows an illustration of a relative dispersion of the impedances of the partial capacitances at a temperature of -40 ° C
  • Fig. 6 shows an exemplary course of the method for preheating an intermediate circuit capacitance.
  • Figure 1 shows an equivalent circuit diagram for an intermediate circuit capacitor 1, for example made up of six partial capacitances 2 C I , C II , C III , C IV , C V , C VI .
  • each partial capacitance 2 which can each be an electrolytic capacitor, for example, is illustrated with its ideal capacitance C 1 , C 2 , ..., C 6 and its serial parasitic resistance R 1 , R 2 , ..., R 6 (series resistance).
  • Figure 1 also shows the voltage U DC across the intermediate circuit capacitance 1, the total current I 0 of the intermediate circuit capacitance 1 and the partial currents I 1 , I 2 , ..., I 6 through the partial capacitances 2.
  • a total current I 0 is applied to the intermediate circuit capacitance 1, said current is first divided into the partial currents I 1 , I 2 and I 3 and then into the partial currents I 4 , I 5 and I 6 .
  • the larger partial current in the upper area of the equivalent circuit diagram as well as in the lower area will flow through the partial capacitances 2 C I , C II , C III , C IV , C V , C VI , which have the lowest serial parasitic resistance.
  • this should be the partial capacitances 2 with the designation C I and C V with the associated partial currents I 1 and I 5 .
  • Figure 2a shows an illustration of a time profile of partial currents I 1 to I 6 in the partial capacitances 2 C I , C II , C III , C IV , C V , C VI at a first point in time.
  • the partial currents I 1 and I 5 have the greatest amplitudes.
  • This uneven distribution of the partial currents I 1 to I 6 is caused by the strong dispersion of the impedance of the electrolytic capacitors C I , C II , C III , C IV , C V , C VI used as partial capacitances 2.
  • the partial currents I 1 and I 5 with the largest amplitude lead in the associated partial capacitances 2 with the designation C I and C V to the fact that these partial capacitances 2 heat up the fastest. Since the impedance is temperature-dependent, this heating up of these partial capacitances 2 leads to a further temperature-dependent reduction in the impedance and thus to a further increase in the partial currents I 1 and I 5 .
  • Figure 2b shows an illustration of a time profile of partial currents in the partial capacitances at a later second point in time. Both the increase in the amplitudes of the partial currents I 1 and I 5 through the partial capacitances 2 with the designation C I and C V as well as the decrease in the partial currents I 2 , I 3 , I 4 , and I 6 through the partial capacitances 2 with the designation C II , C III , C IV , and C VI can be seen.
  • the partial capacitances 2 of the intermediate circuit capacitance 1 are both heated up non-uniformly and loaded to different degrees, which can lead to premature aging of individual partial capacitances 2 or to their failure.
  • a preheating phase is introduced in an operating phase at a point in time before the actual operation of the assembly including the intermediate circuit capacitance 1.
  • Such an assembly is, for example, an inverter which drives an electric motor in an electric coolant compressor.
  • the partial capacitances 2 of the intermediate circuit capacitance 1 are charged and discharged by means of an alternating current I 8 with a selected frequency f. Both the frequency f and the amplitude of the alternating current I 8 are actively influenced by the present method. This charging or discharging process of the partial capacitances 2 does not have to be carried out until the partial capacitances are fully charged or discharged, wherein the alternating current I 8 can have a DC component.
  • Figure 3 illustrates an example of an arrangement for implementing the method for preheating an intermediate circuit capacitance 1. It is particularly advantageous that the method for preheating an intermediate circuit capacitance 1, that is to say, the generation of the alternating current I 8 with a selected frequency f, can be implemented in an inverter using existing components.
  • the intermediate circuit capacitance 1 is arranged between the potentials HV+ and HV- and in parallel to the half bridges 3a, 3b and 3c.
  • the intermediate circuit capacitance 1 illustrated in Figure 3 corresponds to the intermediate circuit capacitance 1 illustrated in Figure 1 and is intended to comprise, for example, six partial capacitances 2, such as the electrolytic capacitors C I , C II , C III , C IV , C V , C VI .
  • Figure 3 shows three half bridges 3a, 3b and 3c of an inverter with the respective high-side power switches 4a, 4b and 4c and the respective low-side power switches 5a, 5b and 5c.
  • the high-side power switches 4a, 4b and 4c and the low-side power switches 5a, 5b and 5c are illustrated with their respective free-wheeling diodes 6, but not with a connection of their control electrodes to the central control unit.
  • the connections of the outputs of the half bridges 3a, 3b and 3c or the inverter for outputting the voltages of the three phases (X or Y or Z) are depicted.
  • the output of the half bridge 3a is connected to the phase X with the first motor winding 7a L1
  • the output of the half bridge 3b is connected to the phase Y with the second motor winding 7b L2
  • the output of the half bridge 3c is connected to the phase Z with the third motor winding 7c L3.
  • the low-side power switches 5b and 5c of the half bridges 3b and 3c are switched through, whereby one end each of the motor windings 7b and 7c is connected with the potential HV-.
  • the high-side power switch of the first half bridge 3a is driven with a clock signal having the frequency f, which is in a range less than 500 Hz.
  • the generation of this clock signal takes place in the central control unit, which also controls the inverter in its operating phase.
  • the central control unit is not illustrated in Figure 3.
  • FIG. 4 shows an illustration of a time profile of an alternating current I 8 for preheating an intermediate circuit capacitance 1 with different frequencies f.
  • the generated alternating current I 8 has a frequency f 1 which could be, for example, about 400 Hz.
  • the generated alternating current I 8 has a frequency f 2 , which is lower than the frequency f 1 and could be, for example, about 100 Hz.
  • the frequency f is predetermined to be in a range less than 500 Hz by the central control unit and thus the amplitude of the alternating current I 8 is also affected, since here charging or discharging processes of the intermediate circuit capacitance 1 are running.
  • the present method achieves that the partial capacitances 2 (C I , C II , C III , C IV , C V , C VI ) uniformly heat up, by the fact that the alternating current I 8 is generated with a frequency f in a range less than 500 Hz.
  • Figure 5 shows an illustration of a relative dispersion of the impedances Z of the partial capacitances 2, such as, for example, electrolytic capacitors, at a temperature of -40 o C.
  • the impedances Z of the partial capacitances 2 differ from one another. This deviation or dispersion of the impedances Z of the partial capacitances 2 causes a current through the partial capacitances 2 that deviates from one another, which in turn leads to the already described problematic different loading of the partial capacitances 2. This is the case in particular in a frequency range in which inverters are operated with their operating frequency of, for example, 20 kHz to 30 kHz.
  • the deviations or the dispersion of the impedances Z of the partial capacitances 2 become smaller as the frequency decreases. This is especially the case in a range less than 500 Hz. If the partial capacitances 2 are charged and discharged with an alternating current I 8 with a frequency in the range less than 500 Hz, for example with a frequency f of 100 Hz, the partial capacitances 2 heat up uniformly because their impedances Z are almost the same.
  • the inverter can be operated in its operating phase in which it drives an electric motor. Since the partial capacitances 2 now have a temperature of, for example, 0 o C or more due to the preheating phase, the operation of the partial capacitances 2 of the intermediate circuit capacitance 1 in the range of the operating frequency of the inverter is no longer critical, since at this temperature the deviations or the dispersion of the impedances Z of the partial capacitances 2 are much lower.
  • FIG. 5 shows a logarithmic course of the frequency f in Hz on the abscissa, while the ratio of the absolute values of the impedances Z 1 and Z 5 of the partial capacitances 2 with the exemplary designations C I and C V is exemplified on the ordinate.
  • Such partial capacitances 2 may be in particular electrolytic capacitors based on an intermediate circuit capacitance 1 having, for example, six partial capacitances 2 (C I , C II , C III , C IV , C V , C VI ).
  • Figure 6 shows an exemplary course of the method for preheating an intermediate circuit capacitance.
  • the course is exemplified for a case in which a time period t is predetermined. This can be 30 seconds in the example.
  • the time period t can also be predetermined as a function of the outside or ambient temperature or as a function of a temperature of the partial capacitances 2 of the intermediate circuit capacitance 1. In these cases, the time period t will generally be greater the smaller the measured temperature value.
  • the operation of the inverter starts at step 9, in which the intermediate circuit capacitance 1 consisting of several partial capacitances 2 is used.
  • a temperature measurement takes place at step 10.
  • both a measurement of the outside or ambient temperature and a measurement of the temperature of the partial capacitances 2 of the intermediate circuit capacitance 1 can be the basis for the further process.
  • suitable sensors are arranged or existing sensors are utilized.
  • an existing sensor in a vehicle can be used to determine the outside or ambient temperature.
  • the temperature value T mess determined during the temperature measurement is compared with a predetermined temperature value T vergl .
  • This predetermined temperature value T vergl describes a temperature threshold from which a preheating phase is no longer necessary. In this comparison it is determined whether T mess ⁇ T vergl .
  • this predetermined temperature value T vergl can be 0 o C. If, at step 11, in the temperature comparison according to T mess ⁇ T vergl it is established that the determined temperature value T mess is greater than the predetermined temperature value T vergl , a preheating phase within the method for preheating an intermediate circuit capacitance is not necessary and the method is continued at step 15, at which the preheating phase is ended. Then, the operating phase of the inverter starts.
  • step 11 in the temperature comparison according to T mess ⁇ T vergl , it is established that the determined temperature value T mess is smaller than the predetermined temperature value T vergl , the method is continued at step 12.
  • step 12 the generation of the alternating current I 8 with its predetermined frequency f, which is less than 500 Hz begins.
  • This generation of the alternating current I advantageously takes place using the half bridges 3a, 3b and 3c present in the inverter in the manner already described above. As a result of the charging and discharging processes of the partial capacitances 2 that take place in this way, they are almost uniformly heated up or preheated.
  • step 13 there is a monitoring of the expiration of the predetermined time period t of 30 seconds, for example. Once the time period t has elapsed, the method is continued at step 14, at which the generation of the alternating current I with its predetermined frequency f is ended.
  • step 15 at which the preheating phase is ended and the operating phase of the inverter is started.
  • a further temperature measurement can optionally be carried out at step 10. In this way it can be determined if the preheating was successful. For example, if the time period t was sufficiently long, the determined temperature value T mess is now greater than the predetermined temperature value T vergl , and the method is ended at step 15 after this further comparison at step 11.
  • the method is continued at step 12 in a further loop for preheating the partial capacitances 2 of the intermediate circuit capacitance 1 after this further comparison at step 11.
  • This process of partial repetition of the process cycle is indicated in Figure 6 by means of a dash-dash line.
  • the direct connecting line between the steps 14 and 15 would be interrupted in a suitable manner, which is not illustrated in Figure 6.
  • a central control unit controls both the course of the method illustrated in Figure 6 in the preheating phase and the operation of the inverter in its operating phase, in which it drives an electric motor in an electric coolant compressor, for example.
  • the invention relates to a method for preheating an intermediate circuit capacitance, which is made up of a plurality of parallel-connected partial capacitances in an intermediate circuit of an inverter.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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PCT/KR2021/001331 2020-02-07 2021-02-02 Method for preheating an intermediate circuit capacitance WO2021157989A1 (en)

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DE102020103166.1A DE102020103166A1 (de) 2020-02-07 2020-02-07 Verfahren zum Vorwärmen einer Zwischenkreiskapazität
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US20140029308A1 (en) * 2011-03-09 2014-01-30 Solantro Semiconductor Corp. Inverter having extended lifetime dc-link capacitors
WO2014037297A1 (de) * 2012-09-10 2014-03-13 Robert Bosch Gmbh Verfahren zur erhöhung der lebensdauer des zwischenkreiskondensators einer einen wechselrichter aufweisenden elektrischen anlage, elektrische anlage und steuereinheit für eine elektrische anlage
US20160204693A1 (en) * 2013-08-23 2016-07-14 Osram Gmbh Two-stage clocked electronic evergy converter
US20170338680A1 (en) * 2016-05-17 2017-11-23 Continental Automotive Gmbh Device for Charging and Discharging a Capacitive Load
WO2018210869A1 (de) * 2017-05-16 2018-11-22 Valeo Siemens Eautomotive Germany Gmbh Wechselrichter mit zwischenkreiskondensatorkaskade sowie dc-seitigen gleichtakt- und gegentaktfiltern

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