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CN113644835B - Pulse width modulation method, storage medium, electronic device, and inverter circuit - Google Patents

Pulse width modulation method, storage medium, electronic device, and inverter circuit Download PDF

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Publication number
CN113644835B
CN113644835B CN202110920654.6A CN202110920654A CN113644835B CN 113644835 B CN113644835 B CN 113644835B CN 202110920654 A CN202110920654 A CN 202110920654A CN 113644835 B CN113644835 B CN 113644835B
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switching device
temperature
value
switching
temperature value
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CN113644835A (en
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林石裕
王立新
吴俊杰
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Shanghai Rujing Intelligent Control Technology Co ltd
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Shanghai Rujing Intelligent Control Technology Co ltd
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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
    • H02M7/53875—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 with analogue control of three-phase output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides a pulse width modulation method, a storage medium, an electronic device and an inverter circuit, wherein the pulse width modulation method comprises the following steps: acquiring a temperature value of a switching device; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit; determining a temperature average of the first temperature value and the second temperature value; and controlling the execution time of the switching action of the switching device according to the temperature average value. The invention further reduces the loss of the switching device and improves the efficiency of the inverter circuit by linking with the heat generated by the switching device during actual work, so that a frequency converter system applying the inverter circuit can save more energy and reduce emission. Further, the uniform heating also reduces the overall temperature rise of the switching device, thereby improving the reliability and the service life of the product.

Description

Pulse width modulation method, storage medium, electronic device, and inverter circuit
Technical Field
The invention belongs to the technical field of circuit control, relates to a modulation method, and particularly relates to a pulse width modulation method, a storage medium, electronic equipment and an inverter circuit.
Background
With the development of power electronic technology, the variable frequency speed control system is widely applied due to the excellent energy-saving effect. The loss of the frequency converter is also paid more and more attention, and the efficiency of the frequency converter also begins to become an important index.
The frequency converter generally controls a power switching device through a pulse width modulation technology, and the purpose of frequency modulation and voltage regulation is achieved through duty ratio change. Compared with the SPWM (Sinusoidal Pulse Width Modulation), the SVPWM (Space Vector Pulse Width Modulation) technique can achieve a higher dc voltage utilization rate, and thus is becoming mainstream gradually.
In the prior art, in order to improve the efficiency during pulse width modulation, some improvements are made on inverter circuit control of a frequency converter, but although the loss of a switching device is reduced by some methods, the distribution of switches in 6 paths of switching devices is not balanced, the power consumption and the temperature distribution are changed, and the service life of a device with high temperature is also reduced.
Therefore, how to provide a pulse width modulation method, a storage medium, an electronic device, and an inverter circuit to solve the problem that the loss of each switching device is not uniformly distributed while the pulse width modulation efficiency is not improved in the prior art becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a pulse width modulation method, a storage medium, an electronic device, and an inverter circuit, which are used to solve the problem that the loss of each switching device cannot be uniformly distributed while improving the pulse width modulation efficiency in the prior art.
To achieve the above and other related objects, an aspect of the present invention provides a pulse width modulation method applied to an inverter circuit, the pulse width modulation method including: acquiring a temperature value of a switching device; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit; determining a temperature average of the first temperature value and the second temperature value; and controlling the execution time of the switching action of the switching device according to the temperature average value.
In an embodiment of the present invention, the step of controlling the timing of performing the switching operation of the switching device according to the magnitude of the temperature average value includes: judging whether the average temperature value is less than or equal to a preset temperature value or not; if yes, executing a mean zero sequence mode, and controlling the upper bridge arm switching device and the lower bridge arm switching device to perform switching actions in each switching period; if not, controlling the execution time of the switching action of the switching device according to the magnitude of the absolute value of the temperature difference between the first temperature value and the second temperature value.
In an embodiment of the invention, the step of controlling the execution timing of the switching operation of the switching device according to the magnitude of the absolute value of the temperature difference between the first temperature value and the second temperature value includes: judging whether the absolute value of the temperature difference is less than or equal to a preset temperature difference or not; if so, executing an alternate zero sequence mode, and controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform switching action at a preset position of a wave crest and a wave trough of each switching period; if not, controlling the execution time of the switching action of the switching device according to the temperature difference between the first temperature value and the second temperature value.
In an embodiment of the present invention, the step of controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform a switching operation at a predetermined position of a peak and a trough of each switching cycle includes: determining the peak or the trough of each switching period; and controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform switching actions within a preset angle range corresponding to the wave crest or the wave trough.
In an embodiment of the invention, the step of controlling the execution timing of the switching action of the switching device according to the magnitude of the temperature difference between the first temperature value and the second temperature value includes: setting an extreme value zero sequence variable; if the temperature difference is larger than the preset temperature difference, increasing the time for which the upper bridge arm switching device does not perform switching action according to the extreme value zero sequence variable; and if the temperature difference is smaller than the opposite number of the preset temperature difference, increasing the time of the lower bridge arm switching device without switching according to the extreme value zero sequence variable.
In an embodiment of the present invention, the step of increasing the time during which the upper bridge arm switching device does not perform the switching operation according to the extreme value zero sequence variable includes: and if the extreme value zero-sequence variable is a first numerical value, controlling the switching of the extreme value zero-sequence signal and the alternate zero-sequence signal through a duty ratio.
In an embodiment of the present invention, the step of increasing the time during which the lower bridge arm switching device does not perform the switching operation according to the extreme value zero sequence variable includes: and if the extreme value zero sequence variable is a second numerical value, controlling the switching of the extreme value zero sequence signal and the alternate zero sequence signal through the duty ratio.
To achieve the above and other related objects, another aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements the pulse width modulation method.
To achieve the above and other related objects, a further aspect of the present invention provides an electronic device, comprising: a processor and a memory; the memory is used for storing computer programs, and the processor is used for executing the computer programs stored by the memory so as to enable the electronic equipment to execute the pulse width modulation method.
To achieve the above and other related objects, a last aspect of the present invention provides an inverter circuit, comprising: temperature sensor, switching device, said electronic device and driver; the temperature sensor detects a temperature value of the switching device and transmits the temperature value to the electronic equipment; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit; the electronic equipment acquires the temperature value; determining a temperature average of the first temperature value and the second temperature value; controlling the execution time of the switching action of the switching device according to the temperature average value; generating a driving signal corresponding to the execution timing and transmitting the driving signal to the driver; the driver drives the switching device according to the driving signal.
As described above, the pulse width modulation method, the storage medium, the electronic device, and the inverter circuit according to the present invention have the following advantageous effects:
the invention utilizes the temperature values of the switching devices to carry out analysis, and determines the execution time of the switching action of each switching device according to the temperature magnitude relation between the upper bridge arm switching device and the lower bridge arm switching device. Through linkage with heat generated by a switching device during actual work, the loss of the switching device is further reduced, the efficiency of the inverter circuit is improved, and the frequency converter system applying the inverter circuit is more energy-saving and emission-reducing. Further, the uniform heating also reduces the overall temperature rise of the switching device, thereby improving the reliability and the service life of the product.
Drawings
Fig. 1 is a schematic flow chart illustrating a pwm method according to an embodiment of the present invention.
FIG. 2 is a diagram of a DC-to-AC inverter circuit according to an embodiment of the PWM method of the present invention.
Fig. 3 is a schematic diagram illustrating a temperature value analysis of an embodiment of the pwm method of the present invention.
Fig. 4 is a zero sequence waveform diagram of the mean value of the pwm method according to an embodiment of the present invention.
Fig. 5 is a diagram of an alternate zero sequence waveform of the pwm method according to an embodiment of the present invention.
Fig. 6 is a waveform diagram of modulation of the lower arm without switching according to an embodiment of the pwm method of the present invention.
Fig. 7 is a waveform diagram of the upper limit of the non-switching time of the lower arm in an embodiment of the pwm method of the present invention.
Fig. 8 is a waveform diagram of modulation of the upper arm without switching according to an embodiment of the pwm method of the present invention.
Fig. 9 is a waveform diagram of the upper limit of the non-switching time of the upper arm in an embodiment of the pwm method of the present invention.
Fig. 10 is a schematic structural connection diagram of an electronic device according to an embodiment of the invention.
Fig. 11 is a schematic circuit diagram of an inverter circuit according to an embodiment of the invention.
Description of the element reference
1. Electronic device
11. Processor with a memory having a plurality of memory cells
12. Memory device
2. Temperature sensor
3. Switching device
4. Driver
S11 to S13
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The pulse width modulation method, the storage medium, the electronic equipment and the inverter circuit are linked with heat generated by the switching device during actual work, so that the loss of the switching device is further reduced, the efficiency of the inverter circuit is improved, and a frequency converter system applying the inverter circuit is more energy-saving and emission-reducing. Further, the uniform heating also reduces the overall temperature rise of the switching device, thereby improving the reliability of the product and prolonging the service life of the product.
The principle and implementation of a pulse width modulation method, a storage medium, an electronic device and an inverter circuit according to the present embodiment will be described in detail below with reference to fig. 1 to 11, so that those skilled in the art can understand the pulse width modulation method, the storage medium, the electronic device and the inverter circuit according to the present embodiment without creative work.
Referring to fig. 1, a schematic flow chart of a pwm method according to an embodiment of the invention is shown. As shown in fig. 1, the pulse width modulation method specifically includes the following steps:
s11, acquiring a temperature value of the switching device; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit.
Please refer to fig. 2, which illustrates a dc-to-ac inverter circuit according to an embodiment of the pwm method of the present invention. As shown in fig. 2, TC1 indicates a temperature sensor of the bridge arm switching device on the inverter circuit, and TC2 indicates a temperature sensor of the bridge arm switching device on the lower side of the inverter circuit. Q1, Q2, Q3, Q4, Q5 and Q6 are switching elements of the inverter circuit, and are connected with a driver to perform switching action, C1 and C2 are bus capacitors, and DC bus voltage DC + and DC-is between the upper end of C1 and the lower end of C2.
In practical applications, the Temperature sensor may be any one of a thermocouple, a thermistor, a platinum Resistance RTD (Resistance Temperature Detector) and an Integrated Circuit (Integrated Circuit) chip, and preferably, the Temperature sensor is selected from an NTC (Negative Temperature Coefficient) type thermistor or a linear output Temperature IC.
S12, determining the temperature average value of the first temperature value and the second temperature value.
And S13, controlling the execution time of the switching action of the switching device according to the temperature average value.
In an embodiment, S13 specifically includes the following steps:
(1) And judging whether the average temperature value is less than or equal to a preset temperature value or not.
Please refer to fig. 3, which is a schematic diagram illustrating a temperature value analysis method of a pwm method according to an embodiment of the present invention. As shown in fig. 3, the timing of executing the switching operation of each switching device is determined according to the different temperature relationship between the upper arm switching device and the lower arm switching device.
Specifically, the average temperature value is T, the first temperature value, i.e., the temperature value of the upper bridge arm switching device, is Tu, and the second temperature value, i.e., the temperature value of the lower bridge arm switching device, is Td. Then, the temperature average value T = (Tu + Td)/2. The preset temperature value is A, and therefore the size relation between T and A is compared.
(2) And if so, executing a mean zero sequence mode, and controlling the upper bridge arm switching device and the lower bridge arm switching device to perform switching actions in each switching period.
Specifically, if T is less than or equal to a, a mean zero sequence mode is executed, and the upper bridge arm switching device and the lower bridge arm switching device are controlled to perform switching actions in each switching cycle.
In practical applications, please refer to fig. 4, which shows a zero sequence waveform diagram of the mean value of the pwm method according to an embodiment of the present invention. As shown in fig. 4, the abscissa is time, and the ordinate is voltage, which shows that the upper arm switching device performs a switching operation in each switching period at a peak and the lower arm switching device performs a switching operation in each switching period at a valley.
Specifically, the mean zero sequence signal calculation process is as follows:
Figure BDA0003207329610000051
wherein,
Figure BDA0003207329610000052
for the zero-sequence component to be injected, is selected>
Figure BDA0003207329610000053
Is the maximum value of the three-phase sine modulated wave>
Figure BDA0003207329610000054
Is the minimum value in the three-phase sine modulation wave.
(3) If not, controlling the execution time of the switching action of the switching device according to the magnitude of the absolute value of the temperature difference between the first temperature value and the second temperature value.
Specifically, if T > a, the timing of executing the switching operation of the switching device is controlled according to the magnitude abs (Tu-Td) of the absolute value of the temperature difference between the first temperature value and the second temperature value. The method specifically comprises the following steps:
(3-1) judging whether the absolute value of the temperature difference is less than or equal to a preset temperature difference.
Specifically, let the preset temperature difference be deltaT, and determine whether abs (Tu-Td) is less than or equal to deltaT.
And (3-2) if yes, executing an alternating zero sequence mode, and controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform switching actions at preset positions of wave crests and wave troughs of each switching period.
In one embodiment, the peak or trough of each switching cycle is determined; and controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform switching action within a preset angle range corresponding to the wave crest or the wave trough.
Specifically, if abs (Tu-Td) is less than or equal to deltaT, an alternating zero sequence mode is performed, for example, the preset angle range is 60 degrees, and the upper bridge arm switching device and the lower bridge arm switching device are controlled not to perform a switching operation within the 60-degree range corresponding to the peak or the trough. Referring to fig. 5, an alternate zero sequence waveform diagram of the pwm method according to an embodiment of the present invention is shown.
Specifically, the alternating zero sequence signal calculation process is as follows:
Figure BDA0003207329610000061
wherein,
Figure BDA0003207329610000062
for the zero-sequence component to be injected, is selected>
Figure BDA0003207329610000063
Is the maximum value of the three-phase sine modulated wave>
Figure BDA0003207329610000064
The minimum value of the three-phase sine modulation wave is M, the extreme value zero sequence variable is M =1 or 0.
And (3-3) if not, controlling the execution time of the switching action of the switching device according to the temperature difference between the first temperature value and the second temperature value.
Specifically, when abs (Tu-Td) > deltaT, the timing of the switching operation of the switching device is controlled according to the magnitude relationship between Tu-Td and deltaT or deltaT. The method specifically comprises the following steps:
(3-3-1) setting an extreme value zero sequence variable.
Specifically, an extreme value zero sequence variable is set to be M, and M is M in an extreme value zero sequence signal calculation formula, and the extreme value zero sequence signal calculation process is as follows:
Figure BDA0003207329610000065
wherein,
Figure BDA0003207329610000066
for a zero-sequence component to be injected>
Figure BDA0003207329610000067
Is the maximum value of the three-phase sine modulated wave>
Figure BDA0003207329610000068
And M is a minimum value in the three-phase sine modulation wave, is an extreme value zero sequence variable, and is M =1 or 0.
(3-3-2) if the temperature difference is larger than the preset temperature difference, increasing the time that the upper bridge arm switching device does not perform switching action according to the extreme value zero sequence variable.
Specifically, if the extreme value zero sequence variable is a first value, the switching between the extreme value zero sequence signal and the alternate zero sequence signal is controlled through the duty ratio.
In practical applications, the extreme value zero sequence variable is a first value 0, i.e., M =0. If Tu-Td > deltaT, the non-switching time of the upper bridge arm switching device is increased, and the modulation waveform refers to fig. 8, fig. 8 shows the non-switching modulation waveform of the upper bridge arm in an embodiment of the pulse width modulation method of the present invention; the upper limit of the non-switching time is operated according to the extreme value zero sequence (M = 0), the modulation waveform is shown in fig. 9, and fig. 9 is a waveform diagram of the upper bridge arm non-switching time upper limit of the pulse width modulation method in an embodiment of the invention.
When Tu-Td>deltaT, duty ratio D (n) = K P (Tu(n)–Td(n))+∑K i (Tu(n)Td (n)), where Kp is a proportionality coefficient, ki is an integral coefficient, tu (n), and Td (n) represents a sampling value at the nth sampling of the upper arm switching device and the lower arm switching device, respectively. The duty cycle is used to control the switching of the extreme zero sequence (M = 0) and alternating zero sequence signals.
(3-3-3) if the temperature difference is smaller than the opposite number of the preset temperature difference, increasing the time that the lower bridge arm switching device does not perform switching action according to the extreme value zero sequence variable.
Specifically, if the extreme value zero-sequence variable is a second numerical value, switching between the extreme value zero-sequence signal and the alternate zero-sequence signal is controlled through a duty ratio.
In practical applications, the extreme zero-sequence variable is a second value 1, i.e., M =1. If Tu-Td < -deltaT, increasing the non-switching time of the lower bridge arm, and the modulation waveform is shown in FIG. 6, FIG. 6 is a waveform diagram of the non-switching modulation of the lower bridge arm in an embodiment of the pulse width modulation method of the present invention; the upper limit of the non-switching time is operated according to the extreme value zero sequence (M = 1), the modulation waveform is shown in fig. 7, and fig. 7 is a waveform diagram of the upper limit of the non-switching time of the lower bridge arm in an embodiment of the pulse width modulation method of the present invention.
When Tu-Td<-deltaT, duty cycle D (n) = -K P (Tu(n)–Td(n))-∑K i (Tu (n) -Td (n)), where Kp is a proportionality coefficient, ki is an integration coefficient, and Tu (n), td (n) respectively represent sampling values at the nth sampling of the upper arm switching device and the lower arm switching device. The duty cycle is used to control the switching of the extreme zero sequence (M = 1) and alternating zero sequence signals.
Thus, the waveform modulation method corresponding to the switching operation control shown in fig. 6 and 8 switches between the alternate zero sequence and the extreme zero sequence on the basis of the alternate zero sequence signal, and can balance the distribution of loss and heat generation without affecting the voltage output.
The protection scope of the pulse width modulation method according to the present invention is not limited to the execution sequence of the steps listed in this embodiment, and all the solutions implemented by adding, subtracting, and replacing steps in the prior art according to the principles of the present invention are included in the protection scope of the present invention.
The present embodiment provides a computer-readable storage medium on which a computer program is stored which, when being executed by a processor, implements the pulse width modulation method.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned computer-readable storage media comprise: various computer storage media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Please refer to fig. 10, which is a schematic structural connection diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 10, the present embodiment provides an electronic device 1, which specifically includes: a processor 11 and a memory 12; the memory 12 is configured to store a computer program, and the processor 11 is configured to execute the computer program stored in the memory 12, so as to enable the electronic device 1 to execute the steps of the pulse width modulation method.
The Processor 11 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component.
The Memory 12 may include a Random Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory.
Fig. 11 is a schematic circuit diagram of an inverter circuit according to an embodiment of the invention. As shown in fig. 11, the inverter circuit according to the present invention includes: an electronic device 1, a temperature sensor 2, a switching device 3 and a driver 4.
The temperature sensor 2 detects a temperature value of the switching device 3 and transmits the temperature value to the electronic apparatus 1; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit.
The electronic device 1 acquires the temperature value; determining a temperature average of the first temperature value and the second temperature value; controlling the execution time of the switching action of the switching device according to the temperature average value; a drive signal corresponding to the execution timing is generated and transmitted to the driver 4.
The driver 4 drives the switching device 3 according to the driving signal.
In an embodiment, the inverter circuit may be any three-phase inverter structure, such as a two-level three-phase inverter circuit.
In summary, the pulse width modulation method, the storage medium, the electronic device, and the inverter circuit according to the present invention analyze the temperature values of the switching devices, and determine the timing of executing the switching operation of the switching devices according to the relationship between the temperatures of the upper arm switching device and the lower arm switching device. Through linkage with the heat generated by the switching device during actual work, the loss of the switching device is further reduced, the efficiency of the inverter circuit is improved, and the frequency converter system applying the inverter circuit is more energy-saving and emission-reducing. Further, the uniform heating also reduces the overall temperature rise of the switching device, thereby improving the reliability and the service life of the product. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (7)

1. A pulse width modulation method is applied to an inverter circuit, and comprises the following steps:
acquiring a temperature value of a switching device; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit;
determining a temperature average of the first temperature value and the second temperature value;
controlling the execution time of the switching action of the switching device according to the temperature average value; judging whether the average temperature value is less than or equal to a preset temperature value or not; if yes, executing a mean zero sequence mode, and controlling the upper bridge arm switching device and the lower bridge arm switching device to perform switching actions in each switching period;
if not, controlling the execution time of the switching action of the switching device according to the magnitude of the absolute value of the temperature difference between the first temperature value and the second temperature value; judging whether the absolute value of the temperature difference is less than or equal to a preset temperature difference or not; if so, executing an alternating zero sequence mode, and controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform switching action at a preset position of a wave crest and a wave trough of each switching period;
if not, controlling the execution time of the switching action of the switching device according to the temperature difference between the first temperature value and the second temperature value; setting an extreme value zero sequence variable; if the temperature difference is larger than the preset temperature difference, increasing the time for which the upper bridge arm switching device does not perform switching action according to the extreme value zero sequence variable; and if the temperature difference is smaller than the opposite number of the preset temperature difference, increasing the time for which the lower bridge arm switching device does not perform switching action according to the extreme value zero sequence variable.
2. The pulse width modulation method according to claim 1, wherein the step of controlling the upper arm switching devices and the lower arm switching devices not to perform a switching operation at a predetermined position of a peak valley of each switching cycle includes:
determining the peak or the trough of each switching period;
and controlling the upper bridge arm switching device and the lower bridge arm switching device not to perform switching action within a preset angle range corresponding to the wave crest or the wave trough.
3. The pwm method according to claim 1, wherein the step of increasing the time during which the upper bridge arm switching device does not perform the switching operation according to the extreme value zero sequence variable comprises:
and if the extreme value zero sequence variable is a first numerical value, controlling the switching of the extreme value zero sequence signal and the alternate zero sequence signal through the duty ratio.
4. The pwm method according to claim 1, wherein the step of increasing the time for which the lower bridge arm switching devices do not perform the switching according to the extreme zero sequence variable comprises:
and if the extreme value zero sequence variable is a second numerical value, controlling the switching of the extreme value zero sequence signal and the alternate zero sequence signal through the duty ratio.
5. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the pulse width modulation method of any one of claims 1 to 4.
6. An electronic device, comprising: a processor and a memory;
the memory is configured to store a computer program and the processor is configured to execute the computer program stored by the memory to cause the electronic device to perform the pulse width modulation method according to any one of claims 1 to 4.
7. An inverter circuit, comprising: a temperature sensor, a switching device, the electronic device of claim 6, and a driver;
the temperature sensor detects a temperature value of the switching device and transmits the temperature value to the electronic equipment; the temperature value comprises a first temperature value of an upper bridge arm switching device and a second temperature value of a lower bridge arm switching device in the inverter circuit;
the electronic equipment acquires the temperature value; determining a temperature average of the first temperature value and the second temperature value; controlling the execution time of the switching action of the switching device according to the temperature average value; generating a driving signal corresponding to the execution timing and transmitting the driving signal to the driver;
the driver drives the switching device according to the driving signal.
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