WO2022092341A1 - Pulse width modulation control device equalizing switching element heat distribution of dual inverter, and method for controlling same - Google Patents
Pulse width modulation control device equalizing switching element heat distribution of dual inverter, and method for controlling same Download PDFInfo
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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
- H02M7/493—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
-
- 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
- H02M7/539—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 automatic control of output wave form or frequency
- H02M7/5395—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 automatic control of output wave form or frequency by pulse-width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/07—Doubly fed machines receiving two supplies both on the stator only wherein the power supply is fed to different sets of stator windings or to rotor and stator windings
- H02P2207/076—Doubly fed machines receiving two supplies both on the stator only wherein the power supply is fed to different sets of stator windings or to rotor and stator windings wherein both supplies are made via converters: especially doubly-fed induction machines; e.g. for starting
Definitions
- the present disclosure relates to a pulse width modulation (PWM) technique for equalizing heat distribution in a switching element of a double inverter, and is applied to an open winding type motor system.
- PWM pulse width modulation
- the double inverter is a device that converts DC power into AC power, and is applied to the drive system of an open winding type induction motor.
- the double inverter converts power through high-speed switching of a power semiconductor such as an insulated gate bipolar transistor (IGBT). the temperature increases At this time, a difference occurs in the losses of the upper and lower switch transistors of one leg of the dual inverter, which appears as an imbalance in temperature.
- IGBT insulated gate bipolar transistor
- 1 is a simulation result for explaining an imbalance in the temperature of a switching element included in a dual inverter.
- a bright part means a conduction loss
- a dark part means a switching loss.
- the losses of the lower switching transistors SIa1, SIb1, SIc1, SIa2, SIb2, and SIc2 are the losses of the upper switching transistors Sa1, Sb1, Sc1, Sa2, Sb2, Sc2. It can be seen that the loss is larger than the loss. Also, it can be seen that there is a large difference in the conduction loss rather than the switching loss.
- a lot of loss means a lot of heat. When heat imbalance occurs between transistors, it is not easy to derive a heat dissipation method for the transistor, and stress is accumulated in the transistor that generates a lot of heat, which may cause malfunction and reduced lifespan.
- a pulse width modulation control method is a pulse width modulation (PULSE WIDTH MODULATION; PWM) control method for equalizing heat distribution in a switching element using a first inverter and a second inverter, extracting a signal to obtain a positive command signal; acquiring a first inverter pulse signal to be applied; acquiring a second inverter pulse signal to be applied to a second inverter based on a negative command signal at a first time, and a second triangle wave; Applying an inverter pulse signal and applying a second inverter pulse signal to a second inverter to generate an output signal for a first time, the first inverter based on the negative command signal and the first triangle wave at the second time obtaining a third inverter pulse signal to be applied to, a positive command signal at a second time, and obtaining a fourth inverter pulse signal to be applied to the second inverter based on the second triangle wave, and to the first inverter and applying a third in
- the command signal of the pulse width modulation control method includes a first command signal, a second command signal, and a third command signal, and a positive command signal is obtained by extracting a positive signal from among the command signals.
- the acquiring step includes: extracting a positive signal from the first command signal to obtain a first positive command signal; extracting a positive signal from the second command signal to obtain a second positive command signal; and and extracting a positive signal from among the three command signals to obtain a third positive command signal, wherein extracting a negative signal from among the command signals to obtain a negative command signal includes: a negative signal from among the first command signals extracting to obtain a first negative command signal; extracting a negative signal from among the second command signals to obtain a second negative command signal; and acquiring a negative command signal, wherein the first command signal, the second command signal, and the third command signal have a phase difference of 120 degrees from each other.
- the obtaining of the first inverter pulse signal of the pulse width modulation control method includes: obtaining a first pulse signal by comparing a first positive command signal with a first triangle wave at a first time; comparing the second positive command signal with the first triangle wave at a first time to obtain a second pulse signal, and at a first time comparing the third positive command signal with the first triangle wave to obtain a third pulse signal including the steps of
- the acquiring of the second inverter pulse signal of the pulse width modulation control method includes: acquiring a fourth pulse signal by comparing the first negative command signal with the second triangle wave at a first time; Comparing the second negative command signal and the second triangle wave at a first time to obtain a fifth pulse signal, and at a first time comparing the third negative command signal with the second triangle wave to obtain a sixth pulse signal including the steps of
- the generating of the output signal for the first time of the pulse width modulation control method includes applying a first pulse signal to the A-phase input unit of the first inverter, and applying the first pulse signal to the B-phase input unit of the first inverter.
- a second pulse signal is applied, a third pulse signal is applied to a phase C input of the first inverter, a fourth pulse signal is applied to a phase A input of the second inverter, and a fifth pulse signal is applied to a phase B input of the second inverter.
- Acquiring the third inverter pulse signal of the pulse width modulation control method includes: acquiring a first level shifting signal based on a first negative command signal; acquiring a second level shifting signal based on the second level shifting signal, acquiring a third level shifting signal based on a third negative command signal, comparing the first level shifting signal with the first triangular wave at a second time for a seventh pulse acquiring a signal, comparing the second level shifting signal with the first triangle wave at a second time to obtain an eighth pulse signal, and comparing the third level shifting signal with the first triangle wave at a second time to obtain a ninth acquiring a pulse signal.
- Acquiring the fourth inverter pulse signal of the pulse width modulation control method includes: acquiring a fourth level shifting signal based on a first positive command signal; obtaining a fifth level shifting signal based on the fifth level shifting signal, obtaining a sixth level shifting signal based on the third positive command signal, comparing the fourth level shifting signal with the second triangle wave at a second time to obtain a tenth pulse acquiring a signal, comparing the fifth level shifting signal with the second triangle wave at a second time to obtain an eleventh pulse signal, and comparing the sixth level shifting signal with the second triangle wave at a second time to obtain a twelfth acquiring a pulse signal.
- the generating of the output signal for the second time of the pulse width modulation control method includes applying a seventh pulse signal to the A-phase input unit of the first inverter, and applying the seventh pulse signal to the B-phase input unit of the first inverter.
- An eighth pulse signal is applied, a ninth pulse signal is applied to a phase C input of the first inverter, a tenth pulse signal is applied to a phase A input of a second inverter, and an eleventh pulse signal is applied to a phase B input of the second inverter.
- generating an output signal for a second time by applying a pulse signal and applying a twelfth pulse signal to a C-phase input unit of a second inverter.
- the entire control period of the pulse width modulation control method includes a first time and a second time, and the entire control period is repeated.
- Acquiring the first level shifting signal of the pulse width modulation control method includes adding a power supply voltage of a first inverter to a first negative command signal, and a second level shifting signal
- the acquiring includes adding a power supply voltage of the first inverter to the second negative command signal
- acquiring the third level shifting signal includes adding the power supply voltage of the first inverter to the third negative command signal includes
- Acquiring the fourth level shifting signal of the pulse width modulation control method includes subtracting a power supply voltage of a second inverter from a first positive command signal, and applying a fifth level shifting signal
- the acquiring includes subtracting the power supply voltage of the second inverter from the second positive command signal
- the acquiring the sixth level shifting signal includes subtracting the power supply voltage of the second inverter from the third positive command signal.
- 1 is a simulation result for explaining an imbalance in the temperature of a switching element included in a dual inverter.
- FIG. 2 is a diagram illustrating an apparatus for controlling pulse width modulation according to an embodiment of the present disclosure.
- FIG 3 is a diagram illustrating a dual inverter according to an embodiment of the present disclosure.
- FIG. 4 is a view for explaining a process of generating a switching signal applied to each inverter according to an embodiment of the present disclosure.
- FIG. 5 is a view for explaining a signal applied to a switching device and a signal applied to an inverse switching device according to an embodiment of the present disclosure.
- FIG. 6 is a flowchart illustrating an operation performed by a control device according to an embodiment of the present disclosure.
- FIG. 7 is a diagram for explaining a step of acquiring a positive command signal and a negative command signal according to an embodiment of the present disclosure.
- FIG 8 shows an equation for converting a command signal used in a control device into a vector according to an embodiment of the present disclosure.
- FIG. 9 is a view for explaining a process of generating an inverter pulse signal according to an embodiment of the present disclosure.
- FIG. 10 shows an equation for calculating a command signal used in a control device according to an embodiment of the present disclosure.
- FIG. 11 is a view for explaining a process of generating an inverter pulse signal according to an embodiment of the present disclosure.
- FIG. 12 is a view for explaining a process of generating an inverter pulse signal according to an embodiment of the present disclosure.
- 13 is a simulation result for explaining the balance of switching element losses included in the dual inverter according to an embodiment of the present disclosure.
- FIG. 14 is a diagram for explaining an experimental effect according to an embodiment of the present disclosure.
- 15 is a diagram for explaining an experimental effect according to an embodiment of the present disclosure.
- the term “unit” refers to a software or hardware component, and “unit” performs certain roles. However, “part” is not meant to be limited to software or hardware. A “unit” may be configured to reside on an addressable storage medium and may be configured to refresh one or more processors. Thus, by way of example, “part” includes components such as software components, object-oriented software components, class components and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. The functionality provided within components and “parts” may be combined into a smaller number of components and “parts” or further divided into additional components and “parts”.
- unit may be implemented with a processor and a memory.
- processor should be interpreted broadly to include general purpose processors, central processing units (CPUs), microprocessors, digital signal processors (DSPs), controllers, microcontrollers, state machines, and the like.
- processor may refer to an application specific semiconductor (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), or the like.
- ASIC application specific semiconductor
- PLD programmable logic device
- FPGA field programmable gate array
- processor refers to a combination of processing devices, such as, for example, a combination of a DSP and a microprocessor, a combination of a plurality of microprocessors, a combination of one or more microprocessors in combination with a DSP core, or any other such configurations. may refer to.
- memory should be interpreted broadly to include any electronic component capable of storing electronic information.
- the term memory includes random access memory (RAM), read-only memory (ROM), non-volatile random access memory (NVRAM), programmable read-only memory (PROM), erase-programmable read-only memory (EPROM), electrical may refer to various types of processor-readable media, such as erasable PROM (EEPROM), flash memory, magnetic or optical data storage, registers, and the like.
- RAM random access memory
- ROM read-only memory
- NVRAM non-volatile random access memory
- PROM programmable read-only memory
- EPROM erase-programmable read-only memory
- electrical may refer to various types of processor-readable media, such as erasable PROM (EEPROM), flash memory, magnetic or optical data storage, registers, and the like.
- a memory is said to be in electronic communication with the processor if the processor is capable of reading information from and/or writing information to the memory.
- a memory integrated in the processor is in electronic communication with the processor.
- FIG. 2 is a diagram illustrating an apparatus for controlling pulse width modulation according to an embodiment of the present disclosure.
- the control device 200 may include a processor 210 and a memory 220 .
- the processor 210 may execute instructions stored in the memory 220 .
- the control device 200 may generate a pulse to be applied to the first inverter and the second inverter in order to equalize the heat distribution of the switching element of the dual inverter based on the command stored in the memory 220 . Also, the control device 200 may apply the generated pulses to the first inverter and the second inverter.
- control device 200 will be described in more detail below.
- FIG 3 is a diagram illustrating a dual inverter according to an embodiment of the present disclosure.
- the dual inverter is a device that converts DC power into one AC power by combining two inverters. It is applied to the drive system of an open winding type induction motor.
- the double inverter can convert power through high-speed switching of a power semiconductor such as an insulated gate bipolar transistor (IGBT).
- IGBT insulated gate bipolar transistor
- such a power semiconductor is referred to as a switching device or a switching transistor.
- the loss of the switching element may include a conduction loss due to a voltage across the switching element and a current flowing through the element.
- the loss of the switching element may include a transient state loss that occurs during switching. The operating temperature of the switching element may increase due to such conduction loss and switching loss.
- the first inverter 310 may include a plurality of switching elements.
- the first inverter 310 includes a 1a switching element Sa1, a 1a inverse switching element SIa1, a 1b switching element Sb1, a 1b inverse switching element SIb1, a 1c switching element ( Sc1), and a 1c inverse switching element SIc1.
- the 1a switching device Sa1 and the 1a inverse switching device SIa1 may be switching devices related to the A phase among the three phases.
- the signal applied to the 1a switching element Sa1 may be complementary to the signal applied to the 1a inverse switching element SIa1 .
- the 1a A signal applied to the inverse switching element SIa1 may be 1.
- Signals to turn off both the switching element and the inverse switching element may be applied in the dead time period inserted for actual operation, but signals applied to each switch element are basically complementary to each other in the non-dead time period.
- the 1b switching device Sb1 and the 1b inverse switching device SIb1 may be switching devices related to the B phase among the three phases.
- the signal applied to the 1b switching element Sb1 may be complementary to the signal applied to the 1b inverse switching element SIb1. For example, when the signal applied to the 1b first switching device Sb1 is 1, the signal applied to the 1b inverse switching device SIb1 is 0, and when the signal applied to the 1b switching device Sb1 is 0, the 1b first switching device Sb1 is 0.
- a signal applied to the inverse switching element SIb1 may be 1.
- the 1c-th switching element Sc1 and the 1c-th inverse switching element SIc1 may be switching elements related to the C phase among the three phases.
- the signal applied to the 1c first switching element Sc1 may be complementary to the signal applied to the 1c inverse switching element SIc1 .
- the signal applied to the 1c-th switching element Sc1 is 1, the signal applied to the 1c-th inverse switching element SIc1 is 0, and when the signal applied to the 1c-th switching element Sc1 is 0, the 1c-th switching element Sc1 is 0.
- a signal applied to the inverse switching element SIc1 may be 1.
- the second inverter 320 may include a plurality of switching elements.
- the second inverter 320 includes a 2a switching element Sa2, a 2a inverse switching element SIa2, a 2b switching element Sb2, a 2b inverse switching element SIb2, and a 2c switching element ( Sc2), and a 2c inverse switching element SIc2.
- 1a switching device Sa1 , 1b switching device Sb1 , 1c switching device Sc1 , 2a switching device Sa2 , 2b switching device Sb2 , and The 2c second switching element Sc2 is referred to as an upper switching element (transistor).
- 1a inverse switching element SIa1, 1b inverse switching element SIb1, 1c inverse switching element SIc1, 2a inverse switching element SIa2, 2b inverse switching element SIb2, and The 2c-th inverse switching element SIc2 is referred to as a lower switching element (transistor).
- the 2a switching device Sa2 and the 2a inverse switching device SIa2 may be switching devices related to the A phase among the three phases.
- the signal applied to the 2a switching element Sa2 may be complementary to the signal applied to the 2a inverse switching element SIa2 .
- the 2a A signal applied to the inverse switching element SIa2 may be 1.
- the 2b switching element Sb2 and the 2b inverse switching element SIb2 may be switching elements related to the B phase among the three phases.
- the signal applied to the 2b switching element Sb2 may be complementary to the signal applied to the 2b inverse switching element SIb2. For example, if the signal applied to the 2b switching device Sb2 is 1, the signal applied to the 2b inverse switching device SIb2 is 0, and when the signal applied to the 2b switching device Sb2 is 0, the 2b second switching device Sb2 is 0.
- a signal applied to the inverse switching element SIb2 may be 1.
- the 2c switching element Sc2 and the 2c inverse switching element SIc2 may be switching elements related to the C phase among the three phases.
- the signal applied to the 2c switching element Sc2 may be complementary to the signal applied to the 2c inverse switching element SIc2 .
- the signal applied to the 2c second switching element Sc2 is 1
- the signal applied to the 2c inverse switching element SIc2 is 0,
- the 2c-th signal applied to the 2c switching element Sc2 is 0.
- a signal applied to the inverse switching element SIc2 may be 1.
- the power supply voltage of the first inverter 310 may be V dc1 . Also, the power supply voltage of the second inverter 320 may be V dc2 .
- Motor 330 may be an open end winding induction machine.
- V OEW the voltage applied to the winding of the motor 330
- the sum of the inverter output voltages at both ends is applied, which can be expressed as [Equation 1].
- phase A here is the switching state for each inverter phase output and has a value of 1 or 0.
- phase B indicates that the phases of phase A, phase B, and phase C are 120 degrees different from each other.
- CBPWM Pulse Width Modulation
- SVM space vector modulation
- FIG. 4 is a view for explaining a process of generating a switching signal applied to each inverter according to an embodiment of the present disclosure.
- 4 is a first command signal for phase A ( ), the first triangular wave vcr1, and the second triangular wave vcr2.
- 2nd command signal for phase B ( ) and the third command signal for C phase ( ) is the first command signal ( ) and the phase are only 120 degrees different, so the first command signal ( ) can be described in the same way.
- the pulse signal is becomes high(1) when It can be low(0) when .
- the pulse signal is becomes low(0) when It can be high(1) when .
- Sa1 of FIG. 4 represents a signal applied to the 1a switching element Sa1 of the first inverter.
- Sa1 When , high (1) is applied to the 1a switching element (Sa1), When , it can be seen that low (0) is applied to the 1a switching element Sa1.
- Sa2 of FIG. 4 represents a signal applied to the second switching element Sa2 of the second inverter. Referring to Figure 4, When , low (0) is applied to the 2a switching element Sa2 and When , it can be seen that high (1) is applied to the 2a switching element Sa2.
- FIG. 5 is a view for explaining a signal applied to a switching device and a signal applied to an inverse switching device according to an embodiment of the present disclosure.
- the pulse signal is becomes high(1) when It can be low(0) when .
- the pulse signal is becomes low(0) when It can be high(1) when . 5 is a schematic view of this.
- the pulse signal is It becomes high (1) when , and in the case of the second inverter, the pulse signal When , it becomes low(0). This is because inversion is made by the inverter 560 .
- the control device 200 may include comparators 510 and 530 and inverters 520 and 540 .
- the comparators 510 and 530 and the inverters 520 and 540 included in the control device 200 may be implemented in hardware or software.
- the comparators 510 and 530 output "1" when the value of the + input signal is greater than the value of the - input signal, and output "0" when the value of the + input signal is smaller than the value of the - input signal.
- the inverters 520 and 540 may invert the input signal. For example, the inverters 520 and 540 may output “0” when the input signal is “1” and output “1” when the input signal is “0”.
- the control device 200 may perform a step of comparing the first command signal Van* with the first triangular wave vcr1 by the comparator 510 .
- the control device 200 may perform a step of generating a signal to be applied to the 1a switching element Sa1 based on the comparator 510 .
- the control device 200 may perform the step of generating the inverse of the signal to be applied to the 1a switching element Sa1 by the inverter 520 .
- the control device 200 may apply the inverse of the signal to be applied to the 1a switching device Sa1 to the 1a inverse switching device SIa1.
- control device 200 may perform a step of comparing the first command signal Van* with the second triangular wave vcr2 by the comparator 530 .
- the control device 200 may perform a step of generating a signal to be applied to the 2a inverse switching element SIa2 based on the comparator 530 .
- the control device 200 may perform the step of generating the inverse of the signal to be applied to the 2a inverse switching element SIa2 by the inverter 540 .
- control device 200 may apply the inverse of the signal to be applied to the 2a inverse switching element SIa2 to the 2a switching element Sa2.
- the first command signal Van* for the A phase has been described as a reference, but the description for the B phase and the C phase includes the first command signal Van* as the second command signal Vbn * and the third Since it can be described by replacing it with the command signal Vcn * , the overlapping description will be omitted.
- FIG. 6 is a flowchart illustrating an operation performed by a control device according to an embodiment of the present disclosure.
- the control device 200 may extract a positive signal from among the command signals to obtain a positive command signal ( 610 ).
- the positive command signal may also be referred to as a first inverter command signal.
- the control device 200 may extract a negative signal from among the command signals to obtain a negative command signal ( 620 ).
- the negative command signal may also be the second inverter command signal. Steps 610 and 620 will be described in conjunction with FIGS. 7 and 8 .
- FIG. 7 is a diagram for explaining a step of acquiring a positive command signal and a negative command signal according to an embodiment of the present disclosure.
- the command signal may include a first command signal Van* corresponding to the A phase, a second command signal Vbn* corresponding to the B phase, and a third command signal Vcn* corresponding to the C phase.
- the first command signal Van*, the second command signal Vbn*, and the third command signal Vcn* may have a phase difference of 120 degrees from each other. In FIG. 7 , the first command signal Van* will be mainly described.
- the control device 200 may extract a positive signal from the first command signal Van* to obtain the first positive command signal Va1*. Also, the control device 200 may extract a negative signal from the first command signal Van* to obtain the first negative command signal Va2*.
- the control device 200 may extract a positive signal from the second command signal Vbn* to obtain a second positive command signal Vb1*. Also, the control device 200 may extract a negative signal from the second command signal Vbn* to obtain the second negative command signal Vb2*.
- the control device 200 may extract a positive signal from the third command signal Vcn* to obtain the third positive command signal Vc1*. Also, the control device 200 may extract a negative signal from the third command signal Vcn* to obtain the third negative command signal Vc2*.
- the positive command signal may include a first positive command signal Va1*, a second positive command signal Vb1*, and a third positive command signal Vc1*.
- the negative command signal may include a first negative command signal Va2*, a second negative command signal Vb2*, and a third negative command signal Vc2*.
- FIG 8 shows an equation for converting a command signal used in a control device into a vector according to an embodiment of the present disclosure.
- the control device 200 may use a positive command signal.
- the positive command signal may include a first positive command signal Va1*, a second positive command signal Vb1*, and a third positive command signal Vc1*.
- the positive command signal may be compared with the first triangular wave vcr1 , and the controller 200 may generate a first inverter pulse signal.
- the control device 200 converts the positive command signal used by the vector into a vector, can be the same as
- the control device 200 may use a negative command signal.
- the negative command signal may include a first negative command signal Va2*, a second negative command signal Vb2*, and a third negative command signal Vc2*.
- the negative command signal may be compared with the second triangular wave vcr2 , and the controller 200 may generate a second inverter pulse signal.
- the control device 200 converts the negative command signal used by the vector into a vector, can be the same as
- the control device 200 may perform an operation 630 of selecting a mode.
- the mode may include a first mode and a second mode.
- the first time may mean a time during which the control device 200 operates in the first mode.
- the first time may be a predetermined time, and may be determined based on a period of a command signal or a period of a triangular wave.
- the second time may mean a time during which the control device 200 operates in the second mode.
- the second time may be a predetermined time, and may be determined based on a period of a command signal or a period of a triangular wave.
- the entire control period may include a first time and a second time. That is, the first time and the second time may alternately arrive.
- the length of the first time and the second time may be the same or different.
- the control device 200 may select the first mode when the first time of the entire control cycle arrives, and select the second mode when the second time arrives.
- control device 200 may select one of the first mode and the second mode according to the temperature of the device. For example, the control device 200 may control the first inverter and the second inverter using the first mode. At this time, when the temperature of the elements included in the first inverter and the second inverter is higher than the threshold temperature, the controller 200 may select the second mode to control the first inverter and the second inverter. Also, when the temperature of the elements included in the first inverter and the second inverter is higher than the threshold temperature, the controller 200 may control the first inverter and the second inverter by using the first mode again.
- the critical temperature may be a predetermined value.
- the control device 200 may perform an operation 640 of obtaining a first inverter pulse signal to be applied to the first inverter based on the positive command signal and the first triangle wave.
- the first triangular wave vcr1 may be compared with a positive command signal among the command signals. Referring briefly to FIG. 4 , the first triangular wave vcr1 may be compared with the first positive command signal Va1 * of the first command signal Van * . Similarly, the first triangular wave vcr1 may be compared with the second positive command signal Vb1 * of the second command signal Vbn * . Also, the first triangular wave vcr1 may be compared with the third positive command signal Vc1 * of the third command signal Vcn * .
- the control device 200 may perform the following steps in order to perform the step 640 of obtaining the first inverter pulse signal.
- the control device 200 may perform a step of obtaining the first pulse signal by comparing the first positive command signal Va1 * with the first triangular wave vcr1 at the first time.
- the control device 200 may compare the second positive command signal Vb1 * with the first triangular wave vcr1 at the first time to obtain the second pulse signal.
- the control device 200 may perform a step of obtaining a third pulse signal by comparing the third positive command signal Vc1 * with the first triangular wave vcr1 at the first time.
- the first inverter pulse signal may include a first pulse signal, a second pulse signal, and a third pulse signal.
- the first pulse signal becomes high (1) when the first positive command signal Va1 * is greater than the first triangle wave vcr1, and the first positive command signal Va1 * becomes the first triangle wave vcr1. It can be low (0) when less than.
- the second pulse signal becomes high (1) when the second positive command signal Vb1 * is greater than the first triangle wave vcr1, and the second positive command signal Vb1 * becomes the first triangle wave (vcr1). It can be low (0) when less than vcr1).
- the third pulse signal becomes high (1) when the third positive command signal Vc1 * is greater than the first triangle wave vcr1, and the third positive command signal Vc1 * becomes the first triangle wave (vcr1). It can be low (0) when less than vcr1).
- the control device 200 may perform an operation 630 of selecting a mode.
- the control device 200 may select the first mode when the first time of the entire control cycle arrives, and select the second mode when the second time arrives.
- control device 200 may perform an operation 650 of obtaining a second inverter pulse signal to be applied to the second inverter based on the negative command signal and the second triangle wave.
- the second triangle wave vcr2 may be compared with a negative command signal among the command signals.
- the negative command signal may include a first negative command signal Va2 * , a second negative command signal Vb2 * , and a third negative command signal Vc2 * .
- the first negative command signal will be described.
- the second triangle wave vcr2 may be compared with the first negative command signal Va2 * among the first command signals Van * .
- the control device 200 may perform the following steps in order to perform the step 650 of obtaining the second inverter pulse signal.
- the control device 200 may compare the first negative command signal Va2 * with the second triangular wave vcr2 at the first time to obtain the fourth pulse signal.
- the control device 200 may compare the second negative command signal Vb2 * with the second triangular wave vcr2 at the first time to obtain a fifth pulse signal.
- the control device 200 may compare the third negative command signal Vc2 * with the second triangular wave vcr2 at the first time to obtain the sixth pulse signal.
- the second inverter pulse signal may include a fourth pulse signal, a fifth pulse signal, and a sixth pulse signal.
- the fourth pulse signal becomes low (0) when the first negative command signal Va2 * is greater than the second triangle wave vcr2, and the first negative command signal Va2 * becomes the second triangle wave vcr2. It can be high(1) when it is less than.
- the fifth pulse signal becomes low (0) when the second negative command signal Vb2 * is greater than the second triangle wave vcr2, and the second negative command signal Vb2 * becomes the second triangle wave vcr2 ) can be high(1).
- the sixth pulse signal becomes low (0) when the third negative command signal Vc2 * is greater than the second triangle wave vcr2, and the third negative command signal Vc2 * becomes the second triangle wave vcr2 ) can be high(1).
- the control device 200 applies the first inverter pulse signal to the first inverter and applies the second inverter pulse signal to the second inverter to generate an output signal for the first time ( 680 ). there is.
- the control device 200 may apply the first pulse signal to the A-phase input units Sa1 and SIa1 of the first inverter 310 . More specifically, the control device 200 may apply the first pulse signal to the 1a switching element Sa1. The controller 200 may apply an inverse of the first pulse signal to the 1a inverse switching element SIa1 based on FIG. 5 .
- control device 200 may apply the second pulse signal to the B-phase input units Sb1 and SIb1 of the first inverter 310 . More specifically, the control device 200 may apply the second pulse signal to the 1b switching element Sb1. The control device 200 may apply an inverse of the second pulse signal to the 1b inverse switching element SIb1 based on FIG. 5 .
- control device 200 may apply the third pulse signal to the C-phase input units Sc1 and SIc1 of the first inverter 310 . More specifically, the control device 200 may apply the third pulse signal to the 1c switching element Sc1. The control device 200 may apply an inverse of the third pulse signal to the 1c inverse switching element SIc1 based on FIG. 5 .
- control device 200 may apply the fourth pulse signal to the A-phase input units Sa2 and SIa2 of the second inverter 320 . More specifically, the control device 200 may apply the fourth pulse signal to the 2a switching element Sa2. The controller 200 may apply the reverse of the fourth pulse signal to the second inverse switching element SIa2 based on FIG. 5 .
- control device 200 may apply the fifth pulse signal to the B-phase input units Sb2 and SIb2 of the second inverter 320 . More specifically, the control device 200 may apply the fifth pulse signal to the 2b switching element Sb2. The controller 200 may apply the inverse of the fifth pulse signal to the 2b inverse switching element SIb2 based on FIG. 5 .
- control device 200 may apply the sixth pulse signal to the C-phase input units Sc2 and SIc2 of the second inverter 320 . More specifically, the control device 200 may apply the sixth pulse signal to the 2c switching element Sc2. The control device 200 may apply the reverse of the sixth pulse signal to the 2c inverse switching element SIc2 based on FIG. 5 .
- the first inverter 310 and the second inverter 320 may generate an output signal for the first time.
- step 680 See FIG. 9 for a more detailed description of step 680 .
- FIG. 9 is a view for explaining a process of generating an inverter pulse signal according to an embodiment of the present disclosure.
- the figure 910 of FIG. 9 is a diagram illustrating an example of observing the first triangular wave vcr1, the second triangular wave vcr2, and the command signal in a very short time range.
- the command signal may have a sine wave as shown in FIG. 4 .
- the reference signal can be approximated as a straight line.
- the first command signal Van* may have a positive signal in a very short time range. Since the first triangular wave vcr1 is compared with the positive signal, the control device 200 may compare the first positive command signal Va1* with the first triangular wave vcr1 in a very short time range. 7, since the first positive reference signal Va1* and the first negative reference signal Va2* cannot simultaneously appear as non-zero values in a very short time span, the first negative reference signal Va2* ) becomes zero.
- the control device 200 determines the first pulse signal as high (1), and the first positive command signal Va1 * ) When is less than the first triangular wave vcr1, the first pulse signal may be determined to be low (0).
- the second command signal Vbn* may have a positive signal. Since the first triangle wave vcr1 is compared with the positive signal, the controller 200 may compare the second positive command signal Vb1* with the first triangle wave vcr1 in a very short time range. 7, since the second positive reference signal Vb1* and the second negative reference signal Vb2* cannot simultaneously appear as non-zero values in a very short time span, the second negative reference signal Vb2* ) becomes zero.
- the control device 200 determines the second pulse signal as high (1), and the second positive command signal Vb1 * ) When is smaller than the first triangular wave vcr1, the second pulse signal may be determined to be low (0).
- the third command signal Vcn* may have a negative signal. Since the second triangle wave vcr2 is compared with the negative signal, the controller 200 may compare the third negative command signal Vc2* with the second triangle wave vcr2 in a very short time range. 7, since the third positive reference signal Vc1* and the third negative reference signal Vc2* cannot simultaneously appear non-zero in a very short time span, the third positive reference signal Vc1* ) becomes zero.
- the control device 200 determines that the sixth pulse signal is low (0) when the third negative command signal Vc2 * is greater than the second triangular wave vcr2, and the third negative command signal Vc2 * is When it is smaller than the second triangular wave vcr2, the sixth pulse signal may be determined to be high (1).
- the command vector signal 1 may be a command signal corresponding to the first inverter.
- the second command vector signal may be a command signal corresponding to the second inverter.
- the first command vector signal and the second command vector signal can be derived by the equation of FIG. 8 .
- the first command signal (Van*) has a positive signal
- the second command signal (Vbn*) has a positive signal
- the third command signal (Vcn*) has a positive signal. has a negative signal, so the first command signal (Van*) and the second command signal (Vbn*) for phase A and B can be used without modification for the first inverter, and the third command signal for phase C
- the command signal Vcn* can be used without modification for the second inverter.
- the control device 200 makes the command vector signal (1) into a vector signal corresponding to the second inverter for the second time, and converts the command vector signal (2) corresponding to the first inverter. It can be made into a vector signal. That is, the control device 200 changes the first command signal Van* and the second command signal Vbn* to be used for the second inverter for the second time period, and the third command signal Vcn* It can be changed to be used for the first inverter.
- the rest of the command signals having a value of zero are also It can be changed appropriately so that there is no distortion in the To this end, in the process of generating the voltage command vectors V1* and V2* applied to each inverter, the control device 200 subtracts or adds Vdc1 or Vdc2 according to FIG. 10 for the positive command signal and the negative command signal.
- the command vector can be changed.
- the second time may mean a time during which the control device 200 operates in the second mode.
- the second time may be a predetermined time, and may be determined based on a period of a command signal or a period of a triangular wave.
- the entire control period may include a first time and a second time.
- the length of the first time period and the length of the second time period may be the same. However, the present invention is not limited thereto, and the lengths of the first time period and the second time period may be different from each other.
- the entire control cycle can be repeated. That is, the first time and the second time may alternately arrive.
- the total control period may be 2n times the period of the command signal.
- n may be a natural number.
- control device 200 may perform an operation 630 of selecting a mode.
- the control device 200 may select the first mode when the first time of the entire control cycle arrives, and select the second mode when the second time arrives.
- the control device 200 acquires a third inverter pulse signal to be applied to the first inverter based on the negative command signal and the first triangle wave vcr1 at the second time (660) can be performed.
- the control device 200 may perform a step of acquiring the first level shifting signal based on the first negative command signal Va2*. For example, the control device 200 may obtain the first level shifting signal by adding the power voltage Vdc1 of the first inverter to the first negative command signal Va2*.
- control device 200 may perform an operation of acquiring the second level shifting signal based on the second negative command signal Vb2*.
- the control device 200 may perform the step of obtaining the second level shifting signal by adding the power voltage Vdc1 of the first inverter to the second negative command signal Vb2*.
- control device 200 may perform an operation of acquiring the third level shifting signal based on the third negative command signal Vc2*. For example, the control device 200 may perform a step of obtaining the third level shifting signal by adding the power voltage Vdc1 of the first inverter to the third negative command signal Vc2*.
- the control device 200 may compare the first level shifting signal with the first triangular wave at the second time to obtain the seventh pulse signal. Also, the control device 200 may compare the second level shifting signal with the first triangular wave at the second time to obtain the eighth pulse signal. Also, the control device 200 may compare the third level shifting signal with the first triangular wave at the second time to obtain the ninth pulse signal.
- the third inverter pulse signal may include a seventh pulse signal, an eighth pulse signal, and a ninth pulse signal.
- the seventh pulse signal becomes high (1) when the first level shifting signal is greater than the first triangular wave vcr1, and becomes low (0) when the first level shifting signal is smaller than the first triangular wave vcr1.
- the eighth pulse signal becomes high (1) when the second level shifting signal is greater than the first triangle wave vcr1, and becomes low (0) when the second level shifting signal is smaller than the first triangle wave vcr1.
- the ninth pulse signal becomes high (1) when the third level shifting signal is greater than the first triangle wave vcr1, and becomes low (0) when the third level shifting signal is smaller than the first triangle wave vcr1.
- control device 200 may perform an operation 630 of selecting a mode.
- the control device 200 may select the first mode when the first time of the entire control cycle arrives, and select the second mode when the second time arrives.
- control device 200 When the second time has arrived, the control device 200 performs a step 670 of obtaining a fourth inverter pulse signal to be applied to the second inverter based on the positive command signal and the second triangle wave at the second time. can do.
- the control device 200 may perform a step of acquiring the fourth level shifting signal based on the first quantity of the command signal. For example, the control device 200 may perform a step of obtaining the fourth level shifting signal by subtracting the power supply voltage Vdc2 of the second inverter from the first positive command signal.
- control device 200 may perform the step of obtaining the fifth level shifting signal based on the second quantity of the command signal.
- the control device 200 may perform a step of obtaining the fifth level shifting signal by subtracting the power supply voltage Vdc2 of the second inverter from the second positive command signal.
- control device 200 may perform the step of acquiring the sixth level shifting signal based on the third quantity of the command signal. For example, the control device 200 may perform a step of obtaining the sixth level shifting signal by subtracting the power supply voltage Vdc2 of the second inverter from the third positive command signal.
- the control device 200 may compare the fourth level shifting signal with the second triangular wave at the second time to obtain the tenth pulse signal. Also, the control device 200 may compare the fifth level shifting signal with the second triangular wave at the second time to obtain the eleventh pulse signal. The control device 200 may compare the sixth level shifting signal with the second triangular wave at the second time to obtain the twelfth pulse signal.
- the fourth inverter pulse signal may include a tenth pulse signal, an eleventh pulse signal, and a twelfth pulse signal.
- the tenth pulse signal becomes low (0) when the fourth level shifting signal is greater than the second triangular wave vcr2, and becomes high (1) when the fourth level shifting signal is smaller than the second triangular wave vcr2. there is. Also, the eleventh pulse signal becomes low (0) when the fifth level shifting signal is greater than the second triangle wave vcr2, and becomes high (1) when the fifth level shifting signal is smaller than the second triangle wave vcr2. can Also, the twelfth pulse signal becomes low (0) when the sixth level shifting signal is larger than the second triangle wave vcr2, and becomes high (1) when the sixth level shifting signal is smaller than the second triangular wave vcr2. can
- FIG. 10 shows an equation for calculating a command signal used in a control device according to an embodiment of the present disclosure.
- the controller 200 may use a negative command signal to generate a third inverter pulse signal to be applied to the first inverter.
- the negative command signal may include a first negative command signal Va2*, a second negative command signal Vb2*, and a third negative command signal Vc2*.
- the control device 200 level-shifts each of the first negative command signal Va2*, the second negative command signal Vb2*, and the third negative command signal Vc2* to obtain a first level shifting signal, A second level shifting signal and a third level shifting signal may be obtained.
- the control device 200 provides the first inverter power supply voltage (Va2*) to the first negative command signal (Va2*), the second negative command signal (Vb2*), and the third negative command signal (Vc2*).
- Vdc1 may be added to obtain a first level shifting signal, a second level shifting signal, and a third level shifting signal, respectively.
- the first level shifting signal, the second level shifting signal, and the third level shifting signal may be compared with the first triangular wave vcr1 , and the controller 200 may generate a third inverter pulse signal.
- the command vector signal used by the control device 200 for the first inverter is shown in FIG. can be the same as
- the controller 200 may use a positive command signal to generate a fourth inverter pulse signal to be applied to the second inverter.
- the positive command signal may include a first positive command signal Va1*, a second positive command signal Vb1*, and a third positive command signal Vc1*.
- the control device 200 level-shifts the first positive command signal Va1*, the second positive command signal Vb1*, and the third positive command signal Vc1*, respectively, to obtain a fourth level shifting signal, A fifth level shifting signal and a sixth level shifting signal may be obtained.
- control device 200 may supply the second inverter power supply voltage ( Vdc2) may be subtracted to obtain the fourth level shifting signal, the fifth level shifting signal, and the sixth level shifting signal, respectively.
- the fourth level shifting signal, the fifth level shifting signal, and the sixth level shifting signal may be compared with the second triangular wave vcr2 , and the controller 200 may generate a fourth inverter pulse signal.
- the negative command vector signal used by the control device 200 for the second inverter is shown in FIG. can be the same as
- FIG. 11 is a view for explaining a process of generating an inverter pulse signal according to an embodiment of the present disclosure.
- FIG. 11 is a diagram illustrating an example of observing a first triangle wave (vcr1), a second triangle wave (vcr2), and a command signal in a very short time range.
- the command signal may have a sine wave as shown in FIG. 4 .
- the reference signal can be approximated as a straight line.
- the control device 200 may acquire the fourth level shifting signals Va2 and IA* based on the first positive command signal Va1*. Also, the control device 200 may acquire the fifth level shifting signals Vb2 and IA* based on the second positive command signal Vb1*. Also, the control device 200 may acquire the third level shifting signals Vc1 and IA* based on the third negative command signal Vc2*.
- the fourth level shifting signals Va2,IA* have a negative signal
- the fifth level shifting signals Vb2,IA* have a negative signal
- the third level shifting signal Since the signals Vc1 and IA* have a positive signal, the fourth level shifting signals Va2,IA* and the fifth level shifting signals Vb2,IA* for the A and B phases drive the second inverter. and the third level shifting signals Vc1 and IA* for the C phase may be used for the first inverter.
- Fig. 11 (a) shows a case in which the control device 200 operates in the first mode at a first time
- Fig. 11 (b) shows a case in which the control device 200 operates in the second mode at a second time. case can be indicated.
- FIG. 12 is a view for explaining a process of generating an inverter pulse signal according to an embodiment of the present disclosure.
- the command vector signal (1) may be a command signal corresponding to the second inverter.
- the second command vector signal may be a command signal corresponding to the first inverter.
- the first command vector signal and the second command vector signal can be derived by the equation of FIG. 8 .
- the control device 200 makes the No. 1 command vector signal into a signal corresponding to the first inverter as shown in the figure 920 of FIG. 9 at the first time, and the No. 2 command vector signal to create a signal corresponding to the second inverter. That is, the control device 200 may compare the first command signal (Van*) and the second command signal (Vbn*) for the first time for the first time and then use the third command signal (Vcn) *) can be used after comparison for the second inverter. Also, at the second time, as shown in FIG.
- the control device 200 may make the command vector signal (1) into a signal corresponding to the second inverter, and make the command vector signal (2) into a signal corresponding to the first inverter. That is, the control device 200 compares the first command signal (Van*) and the second command signal (Vbn*) for the second time to be used after comparison for the second inverter, and the third command signal (Vcn*) ) can be changed to be used after comparison for the first inverter.
- control device 200 applies the third inverter pulse signal to the first inverter and applies the fourth inverter pulse signal to the second inverter to generate an output signal for a second time. (680) may be performed. As described above, the output signal for the first time and the output signal for the second time may be combined to generate an overall output signal.
- the control device 200 may apply the seventh pulse signal to the A-phase input units Sa1 and SIa1 of the first inverter 310 . More specifically, the control device 200 may apply the seventh pulse signal to the 1a switching element Sa1. The control device 200 may apply the reverse of the seventh pulse signal to the 1a inverse switching element SIa1 based on FIG. 5 .
- control device 200 may apply the eighth pulse signal to the B-phase input units Sb1 and SIb1 of the first inverter. More specifically, the control device 200 may apply the eighth pulse signal to the 1b switching element Sb1. The control device 200 may apply an inverse of the eighth pulse signal to the 1b inverse switching element SIb1 based on FIG. 5 .
- control device 200 may apply the ninth pulse signal to the C-phase input units Sc1 and SIc1 of the first inverter. More specifically, the control device 200 may apply the ninth pulse signal to the 1c switching element Sc1. The controller 200 may apply the inverse of the ninth pulse signal to the 1c inverse switching element SIc1 based on FIG. 5 .
- control device 200 may apply the tenth pulse signal to the A-phase input units Sa2 and SIa2 of the second inverter. More specifically, the control device 200 may apply the tenth pulse signal to the second a switching element Sa2. The controller 200 may apply the inverse of the tenth pulse signal to the second inverse switching element SIa2 based on FIG. 5 .
- control device 200 may apply the eleventh pulse signal to the B-phase input units Sb2 and SIb2 of the second inverter.
- control device 200 may apply the eleventh pulse signal to the 2b switching element Sb2.
- the control device 200 may apply the inverse of the eleventh pulse signal to the 2b inverse switching element SIb2 based on FIG. 5 .
- control device 200 may apply the twelfth pulse signal to the C-phase input units Sc2 and SIc2 of the second inverter. More specifically, the control device 200 may apply the twelfth pulse signal to the 2c switching element Sc2. The control device 200 may apply the inverse of the twelfth pulse signal to the 2c inverse switching element SIc2 based on FIG. 5 .
- the first inverter 310 and the second inverter 320 may generate an output signal for the second time.
- FIG. 13 is a simulation result for explaining the balance of the temperature of the switching element included in the dual inverter according to an embodiment of the present disclosure.
- FIG. 14 is a diagram for explaining an experimental effect according to an embodiment of the present disclosure.
- FIG. 15 is a diagram for explaining an experimental effect according to an embodiment of the present disclosure.
- a bright part means a conduction loss
- a dark part means a switching loss
- the losses of the lower switching transistors SIa1 , SIb1 , SIc1 , SIa2 , SIb2 , SIc2 of the first inverter 310 and the second inverter 320 It can be seen that is the same as the loss of the upper switching transistors (Sa1, Sb1, Sc1, Sa2, Sb2, Sc2). Since the maximum value of the loss is reduced compared to FIG. 1 , the control device 200 according to the present disclosure has an effect of facilitating heat management of the first inverter 310 and the second inverter 320 .
- FIG. 14 shows a lower switching transistor and an upper switching transistor of the first inverter.
- Figure 1310 is a diagram showing the heat generation of the inverter when LSWPM, which is the existing method, is applied.
- the figure 1320 is a figure showing the heat generation of the inverter according to the present disclosure. Referring to the figure 1310, the bright part indicates the part that is overheating. Also, it can be seen from Figure 1310 that the losses of the lower switching transistors SIa1, SIb1, and SIc1 are larger than the losses of the upper switching transistors Sa1, Sb1, and Sc1. In addition, it can be seen that the heat generation of the switching transistor shown in Figure 1320 is lower than that of the switching transistor shown in Figure 1310 . That is, it can be confirmed that the simulation result of FIG. 13 is actually displayed.
- the 15 is a graph comparing a method of controlling an inverter according to an existing method and a method of controlling an inverter according to the present disclosure.
- the first time domain 1410 and the third time domain 1430 are results of controlling the inverter according to the existing method.
- the second time region 1420 is a result of controlling the inverter according to the present disclosure.
- the vertical axis of FIG. 14 represents the temperature of the switching transistor. It can be seen that the heat generated by the loss of the switching transistor is uniform in the second time region 1420 as a whole compared to the first time region 1410 and the third time region 1430 .
- the maximum value of the heating temperature due to the loss of the first time region 1410 and the third time region 1430 is greater than the maximum value of the heating temperature due to the loss of the second time region 1420 . Therefore, when using the control device 200 or the control method according to the present disclosure, the user can easily manage the heat of the elements included in the inverter, and it is possible to reduce the cost in designing the heat generating device.
- the above-described embodiments of the present invention can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium.
- the computer-readable recording medium includes a storage medium such as a magnetic storage medium (eg, a ROM, a floppy disk, a hard disk, etc.) and an optically readable medium (eg, a CD-ROM, a DVD, etc.).
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Description
Claims (11)
- 제 1 인버터 및 제 2 인버터를 이용하여 스위칭 소자 발열 분포 균등화를 위한 펄스 폭 변조(PULSE WIDTH MODULATION; PWM) 제어 방법에 있어서,In the pulse width modulation (PULSE WIDTH MODULATION; PWM) control method for equalizing the heat distribution of a switching element using a first inverter and a second inverter,지령 신호 중 양의 신호를 추출하여 양의 지령 신호를 획득하는 단계;extracting a positive signal from among the command signals to obtain a positive command signal;상기 지령 신호 중 음의 신호를 추출하여 음의 지령 신호를 획득하는 단계;obtaining a negative command signal by extracting a negative signal from among the command signals;제 1 시간에 상기 양의 지령 신호 및 제 1 삼각파에 기초하여 제 1 인버터에 인가될 제 1 인버터 펄스 신호를 획득하는 단계;acquiring a first inverter pulse signal to be applied to a first inverter based on the positive command signal and a first triangle wave at a first time;상기 제 1 시간에 상기 음의 지령 신호, 및 제 2 삼각파에 기초하여 제 2 인버터에 인가될 제 2 인버터 펄스 신호를 획득하는 단계;acquiring a second inverter pulse signal to be applied to a second inverter based on the negative command signal and a second triangle wave at the first time;상기 제 1 인버터에 상기 제 1 인버터 펄스 신호를 인가하고, 상기 제 2 인버터에 상기 제 2 인버터 펄스 신호를 인가하여, 상기 제 1 시간에 대한 출력 신호를 생성하는 단계;generating an output signal for the first time by applying the first inverter pulse signal to the first inverter and the second inverter pulse signal to the second inverter;제 2 시간에 상기 음의 지령 신호 및 상기 제 1 삼각파에 기초하여 제 1 인버터에 인가될 제 3 인버터 펄스 신호를 획득하는 단계;acquiring a third inverter pulse signal to be applied to the first inverter based on the negative command signal and the first triangle wave at a second time;상기 제 2 시간에 상기 양의 지령 신호, 및 상기 제 2 삼각파에 기초하여 제 2 인버터에 인가될 제 4 인버터 펄스 신호를 획득하는 단계; 및acquiring a fourth inverter pulse signal to be applied to a second inverter based on the positive command signal and the second triangle wave at the second time; and상기 제 1 인버터에 상기 제 3 인버터 펄스 신호를 인가하고, 상기 제 2 인버터에 상기 제 4 인버터 펄스 신호를 인가하여, 상기 제 2 시간에 대한 출력 신호를 생성하는 단계를 포함하는 펄스 폭 변조 제어 방법.and applying the third inverter pulse signal to the first inverter and the fourth inverter pulse signal to the second inverter to generate an output signal for the second time. .
- 제 1 항에 있어서,The method of claim 1,상기 지령 신호는 제 1 지령 신호, 제 2 지령 신호, 및 제 3 지령 신호를 포함하고,The command signal includes a first command signal, a second command signal, and a third command signal,상기 지령 신호 중 양의 신호를 추출하여 양의 지령 신호를 획득하는 단계는, The step of obtaining a positive command signal by extracting a positive signal from among the command signals,상기 제 1 지령 신호 중 양의 신호를 추출하여 제 1 양의 지령신호를 획득하는 단계;extracting a positive signal from among the first command signals to obtain a first positive command signal;상기 제 2 지령 신호 중 양의 신호를 추출하여 제 2 양의 지령신호를 획득하는 단계; 및extracting a positive signal from among the second command signals to obtain a second positive command signal; and상기 제 3 지령 신호 중 양의 신호를 추출하여 제 3 양의 지령신호를 획득하는 단계를 포함하고,extracting a positive signal from among the third command signals to obtain a third positive command signal;상기 지령 신호 중 음의 신호를 추출하여 음의 지령 신호를 획득하는 단계는,The step of obtaining a negative command signal by extracting a negative signal from the command signal,상기 제 1 지령 신호 중 음의 신호를 추출하여 제 1 음의 지령신호를 획득하는 단계;obtaining a first negative command signal by extracting a negative signal from the first command signal;상기 제 2 지령 신호 중 음의 신호를 추출하여 제 2 음의 지령신호를 획득하는 단계; 및obtaining a second negative command signal by extracting a negative signal from the second command signal; and상기 제 3 지령 신호 중 음의 신호를 추출하여 제 3 음의 지령신호를 획득하는 단계를 포함하고,and extracting a negative signal from among the third command signal to obtain a third negative command signal,상기 제 1 지령 신호, 상기 제 2 지령 신호, 및 상기 제 3 지령 신호는 서로 120도의 위상차가 있는 것을 특징으로 하는 펄스 폭 변조 제어 방법.The pulse width modulation control method, characterized in that the first command signal, the second command signal, and the third command signal have a phase difference of 120 degrees from each other.
- 제 2 항에 있어서,3. The method of claim 2,상기 제 1 인버터 펄스 신호를 획득하는 단계는,Obtaining the first inverter pulse signal comprises:상기 제 1 시간에 상기 제 1 양의 지령 신호와 제 1 삼각파를 비교하여 제 1 펄스 신호를 획득하는 단계; comparing the first positive command signal with a first triangle wave at the first time to obtain a first pulse signal;상기 제 1 시간에 상기 제 2 양의 지령 신호와 제 1 삼각파를 비교하여 제 2 펄스 신호를 획득하는 단계; 및comparing the second positive command signal with a first triangle wave at the first time to obtain a second pulse signal; and상기 제 1 시간에 상기 제 3 양의 지령 신호와 제 1 삼각파를 비교하여 제 3 펄스 신호를 획득하는 단계를 포함하는 펄스 폭 변조 제어 방법.and obtaining a third pulse signal by comparing the third positive command signal with a first triangular wave at the first time.
- 제 3 항에 있어서,4. The method of claim 3,상기 제 2 인버터 펄스 신호를 획득하는 단계는,Obtaining the second inverter pulse signal comprises:상기 제 1 시간에 상기 제 1 음의 지령 신호와 제 2 삼각파를 비교하여 제 4 펄스 신호를 획득하는 단계;obtaining a fourth pulse signal by comparing the first negative command signal with a second triangle wave at the first time;상기 제 1 시간에 상기 제 2 음의 지령 신호와 제 2 삼각파를 비교하여 제 5 펄스 신호를 획득하는 단계; 및obtaining a fifth pulse signal by comparing the second negative command signal with a second triangle wave at the first time; and상기 제 1 시간에 상기 제 3 음의 지령 신호와 제 2 삼각파를 비교하여 제 6 펄스 신호를 획득하는 단계를 포함하는 펄스 폭 변조 제어 방법.and obtaining a sixth pulse signal by comparing the third negative command signal with a second triangular wave at the first time.
- 제 4 항에 있어서,5. The method of claim 4,상기 제 1 시간에 대한 출력 신호를 생성하는 단계는,The step of generating an output signal for the first time comprises:상기 제 1 인버터의 A상 입력부에 상기 제 1 펄스 신호를 인가하고, 상기 제 1 인버터의 B상 입력부에 상기 제 2 펄스 신호를 인가하고, 상기 제 1 인버터의 C상 입력부에 상기 제 3 펄스 신호를 인가하고, 상기 제 2 인버터의 A상 입력부에 상기 제 4 펄스 신호를 인가하고, 상기 제 2 인버터의 B상 입력부에 상기 제 5 펄스 신호를 인가하고, 상기 제 2 인버터의 C상 입력부에 상기 제 6 펄스 신호를 인가하여, 상기 제 1 시간에 대한 출력 신호를 생성하는 단계를 포함하는 펄스 폭 변조 제어 방법.The first pulse signal is applied to the A-phase input of the first inverter, the second pulse signal is applied to the B-phase input of the first inverter, and the third pulse signal is applied to the C-phase input of the first inverter. , applying the fourth pulse signal to the A-phase input of the second inverter, applying the fifth pulse signal to the B-phase input of the second inverter, and applying the fifth pulse signal to the C-phase input of the second inverter. and generating an output signal for the first time by applying a sixth pulse signal.
- 제 2 항에 있어서3. The method of claim 2상기 제 3 인버터 펄스 신호를 획득하는 단계는,Obtaining the third inverter pulse signal comprises:상기 제 1 음의 지령 신호에 기초하여 제 1 레벨 쉬프팅 신호를 획득하는 단계;obtaining a first level shifting signal based on the first negative command signal;상기 제 2 음의 지령 신호에 기초하여 제 2 레벨 쉬프팅 신호를 획득하는 단계;obtaining a second level shifting signal based on the second negative command signal;상기 제 3 음의 지령 신호에 기초하여 제 3 레벨 쉬프팅 신호를 획득하는 단계;obtaining a third level shifting signal based on the third negative command signal;상기 제 2 시간에 상기 제 1 레벨 쉬프팅 신호와 제 1 삼각파를 비교하여 제 7 펄스 신호를 획득하는 단계;obtaining a seventh pulse signal by comparing the first level shifting signal with a first triangle wave at the second time;상기 제 2 시간에 상기 제 2 레벨 쉬프팅 신호와 제 1 삼각파를 비교하여 제 8 펄스 신호를 획득하는 단계; 및obtaining an eighth pulse signal by comparing the second level shifting signal with a first triangular wave at the second time; and상기 제 2 시간에 상기 제 3 레벨 쉬프팅 신호와 제 1 삼각파를 비교하여 제 9 펄스 신호를 획득하는 단계를 포함하는 펄스 폭 변조 제어 방법.and obtaining a ninth pulse signal by comparing the third level shifting signal with a first triangular wave at the second time.
- 제 6 항에 있어서,7. The method of claim 6,상기 제 4 인버터 펄스 신호를 획득하는 단계는,Obtaining the fourth inverter pulse signal comprises:상기 제 1 양의 지령 신호에 기초하여 제 4 레벨 쉬프팅 신호를 획득하는 단계;obtaining a fourth level shifting signal based on the first positive command signal;상기 제 2 양의 지령 신호에 기초하여 제 5 레벨 쉬프팅 신호를 획득하는 단계;obtaining a fifth level shifting signal based on the second positive command signal;상기 제 3 양의 지령 신호에 기초하여 제 6 레벨 쉬프팅 신호를 획득하는 단계;obtaining a sixth level shifting signal based on the third positive command signal;상기 제 2 시간에 상기 제 4 레벨 쉬프팅 신호와 제 2 삼각파를 비교하여 제 10 펄스 신호를 획득하는 단계;obtaining a tenth pulse signal by comparing the fourth level shifting signal with a second triangular wave at the second time;상기 제 2 시간에 상기 제 5 레벨 쉬프팅 신호와 제 2 삼각파를 비교하여 제 11 펄스 신호를 획득하는 단계; 및obtaining an eleventh pulse signal by comparing the fifth level shifting signal with a second triangular wave at the second time; and상기 제 2 시간에 상기 제 6 레벨 쉬프팅 신호와 제 2 삼각파를 비교하여 제 12 펄스 신호를 획득하는 단계를 포함하는 펄스 폭 변조 제어 방법.and obtaining a twelfth pulse signal by comparing the sixth level shifting signal with a second triangular wave at the second time.
- 제 7 항에 있어서8. The method of claim 7상기 제 2 시간에 대한 출력 신호를 생성하는 단계는,The step of generating an output signal for the second time comprises:상기 제 1 인버터의 A상 입력부에 상기 제 7 펄스 신호를 인가하고, 상기 제 1 인버터의 B상 입력부에 상기 제 8 펄스 신호를 인가하고, 상기 제 1 인버터의 C상 입력부에 상기 제 9 펄스 신호를 인가하고, 상기 제 2 인버터의 A상 입력부에 상기 제 10 펄스 신호를 인가하고, 상기 제 2 인버터의 B상 입력부에 상기 제 11 펄스 신호를 인가하고, 상기 제 2 인버터의 C상 입력부에 상기 제 12 펄스 신호를 인가하여, 상기 제 2 시간에 대한 출력 신호를 생성하는 단계를 포함하는 펄스 폭 변조 제어 방법.The seventh pulse signal is applied to the A-phase input unit of the first inverter, the eighth pulse signal is applied to the B-phase input unit of the first inverter, and the ninth pulse signal is applied to the C-phase input unit of the first inverter. and applying the tenth pulse signal to the phase A input of the second inverter, applying the eleventh pulse signal to the phase B input of the second inverter, and applying the eleventh pulse signal to the phase C input of the second inverter. and generating an output signal for the second time by applying a twelfth pulse signal.
- 제 1 항에 있어서,The method of claim 1,전체 제어 주기는 제 1 시간 및 제 2 시간을 포함하고 상기 전체 제어 주기는 반복되는 것을 특징으로 하는 펄스 폭 변조 제어 방법.A method according to claim 1, wherein the entire control period includes a first time and a second time, and the entire control period is repeated.
- 제 6 항에 있어서,7. The method of claim 6,상기 제 1 레벨 쉬프팅 신호를 획득하는 단계는,Obtaining the first level shifting signal comprises:상기 제 1 음의 지령 신호에 제 1 인버터의 전원 전압을 더하는 단계를 포함하고, adding a power supply voltage of a first inverter to the first negative command signal;상기 제 2 레벨 쉬프팅 신호를 획득하는 단계는,Obtaining the second level shifting signal comprises:상기 제 2 음의 지령 신호에 제 1 인버터의 전원 전압을 더하는 단계를 포함하고, adding the power supply voltage of the first inverter to the second negative command signal;상기 제 3 레벨 쉬프팅 신호를 획득하는 단계는,Obtaining the third level shifting signal comprises:상기 제 3 음의 지령 신호에 제 1 인버터의 전원 전압을 더하는 단계를 포함하는 펄스 폭 변조 제어 방법.and adding a power supply voltage of a first inverter to the third negative command signal.
- 제 7 항에 있어서,8. The method of claim 7,상기 제 4 레벨 쉬프팅 신호를 획득하는 단계는,Obtaining the fourth level shifting signal comprises:상기 제 1 양의 지령 신호에 제 2 인버터의 전원 전압을 빼는 단계를 포함하고,subtracting the power supply voltage of a second inverter from the first positive command signal;상기 제 5 레벨 쉬프팅 신호를 획득하는 단계는,Obtaining the fifth level shifting signal comprises:상기 제 2 양의 지령 신호에 제 2 인버터의 전원 전압을 빼는 단계를 포함하고,subtracting the power supply voltage of a second inverter from the second positive command signal;상기 제 6 레벨 쉬프팅 신호를 획득하는 단계는,Obtaining the sixth level shifting signal comprises:상기 제 3 양의 지령 신호에 제 2 인버터의 전원 전압을 빼는 단계를 포함하는 펄스 폭 변조 제어 방법.and subtracting a power supply voltage of a second inverter from the third positive command signal.
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US20090033252A1 (en) * | 2007-07-30 | 2009-02-05 | Gm Global Technology Operations, Inc. | Double ended inverter system for a vehicle having two energy sources that exhibit different operating characteristics |
CN102195511A (en) * | 2010-03-10 | 2011-09-21 | 株式会社电装 | Power converter |
JP2019047587A (en) * | 2017-08-31 | 2019-03-22 | 株式会社デンソー | Control device of rotating electric machine |
JP2019170044A (en) * | 2018-03-22 | 2019-10-03 | トヨタ自動車株式会社 | system |
JP2020078109A (en) * | 2018-11-05 | 2020-05-21 | 株式会社Soken | Drive system |
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US20090033252A1 (en) * | 2007-07-30 | 2009-02-05 | Gm Global Technology Operations, Inc. | Double ended inverter system for a vehicle having two energy sources that exhibit different operating characteristics |
CN102195511A (en) * | 2010-03-10 | 2011-09-21 | 株式会社电装 | Power converter |
JP2019047587A (en) * | 2017-08-31 | 2019-03-22 | 株式会社デンソー | Control device of rotating electric machine |
JP2019170044A (en) * | 2018-03-22 | 2019-10-03 | トヨタ自動車株式会社 | system |
JP2020078109A (en) * | 2018-11-05 | 2020-05-21 | 株式会社Soken | Drive system |
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