CN110138254B - Inverter control method with adjustable input and output parameters - Google Patents
Inverter control method with adjustable input and output parameters Download PDFInfo
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- CN110138254B CN110138254B CN201910551028.7A CN201910551028A CN110138254B CN 110138254 B CN110138254 B CN 110138254B CN 201910551028 A CN201910551028 A CN 201910551028A CN 110138254 B CN110138254 B CN 110138254B
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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
- H02M7/539—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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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Abstract
The invention is suitable for the technical field of electronics, and provides an inverter control method with adjustable input and output parameters, which comprises the following steps: the chip receives input and output parameters at least comprising output sine wave frequency, carrier frequency and an output voltage closed loop, obtains the actual position of table lookup after obtaining the carrier period number, searches a reference duty in a preset reference table, wherein the reference table at least comprises the reference duty and the reference position to obtain an output duty, and outputs the output duty through the chip PWM. The invention can flexibly realize the output of the sine wave duty by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, thereby realizing the adjustability of the input and output parameters of the inverter and being beneficial to improving the efficiency of the inverter.
Description
Technical Field
The invention belongs to the field of electronics, and particularly relates to an inverter control method with adjustable input and output parameters.
Background
The inverter converts direct current electric energy (batteries and storage batteries) into alternating current (generally 220V, 50Hz sine wave). It is composed of inverter bridge, control logic and filter circuit. The multifunctional electric grinding wheel is widely applicable to air conditioners, home theaters, electric grinding wheels, electric tools, sewing machines, DVDs (digital video disks), VCDs (video recorders), computers, televisions, washing machines, range hoods, refrigerators, video recorders, massagers, fans, lighting and the like. In foreign countries, due to the higher popularization rate of automobiles, the inverter can be used for connecting the storage battery to drive electric appliances and various tools to work when going out for work or traveling. The on-board inverter output through the cigarette lighter is of 20W, 40W, 80W, 120W to 150W power specification. And the other larger power inverter power supply is connected to the battery through a connecting wire. Connecting the household appliance to the output of the power converter enables the use of a variety of appliances in the vehicle. Usable electric appliances are: mobile phones, notebook computers, digital video cameras, lighting lamps, electric shavers, CD machines, game machines, palm computers, electric tools, vehicle-mounted refrigerators, and various traveling, camping, medical first-aid appliances.
At present, the common inverters on the market are:
square wave inverter: the square wave inverter outputs square wave alternating current, positive maximum and negative maximum of the square wave alternating current are generated at the same time, great unstable influence is caused to a load and the inverter, the waveform quality is poor, the load capacity is only 40-60% of a rated load, and an inductive load cannot be brought.
Positive spin wave inverter: the sine wave inverter outputs sine wave alternating current which is as good as or even better than a power grid used by people in daily life, and harmonic pollution to the power grid does not exist.
PWM: pwm (pulse Width modulation) control, pulse Width modulation, is a technique that equivalently obtains a desired waveform (including shape and amplitude) by modulating the Width of a series of pulses. The PWM control technology is most widely used in inverter circuits, and most of the inverter circuits are PWM type, and are widely used in many fields from measurement, communication to power control and conversion.
SPWM: the SPWM is characterized in that a pulse modulation mode is changed on the basis of PWM, and the pulse width time duty ratio is arranged according to a sine rule, so that sine wave output can be realized by properly filtering an output waveform. It is widely used in dc-ac inverters and the like, such as UPSs of higher order are an example. The three-phase SPWM is used for simulating three-phase output of commercial power and is widely adopted in the field of frequency converters.
Technologies related to inverters include:
PWM: pulse width modulation is known.
PWM period: the period of the PWM includes a high portion and a low portion thereof.
PWM DUTY: pwm duty is the length of time that the active level is in one pulse period.
Duty ratio: the pwm duty cycle is the proportion of the entire period of the high level in one pulse period. For example, the PWM wave duty ratio of the 1 second high level and the 1 second low level is 50%.
MOSFET Metal-Oxide Semiconductor Field Effect Transistor, Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) for short: is a field-effect transistor (fet) that can be widely used in analog and digital circuits. MOSFETs are classified into "N-type" and "P-type" types according to their "channel" (working carrier) polarities, and are also commonly referred to as NMOSFETs and PMOSFETs, and other types include NMOS and PMOS for short.
An Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power semiconductor device consisting of a Bipolar Junction Transistor (BJT) and an insulated Gate field effect transistor (MOS).
The MOSFET is abbreviated as MOS, and in an inverter together with the IGBT, the direct current is mainly used for realizing sine wave alternating current output through a high-frequency switch of the MOSFET and the IGBT.
The current inverter on the market adopts carrier fixed frequency, the output frequency is only 50/60Hz, and the variable frequency regulation can not be flexibly realized, which is very inconvenient for regulating the efficiency of the inverter.
Aiming at the defects, the embodiment provided by the invention can flexibly realize sine wave duty output by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, thereby realizing the adjustability of input and output parameters of the inverter and being beneficial to improving the efficiency of adjusting the inverter.
Disclosure of Invention
The embodiment of the invention aims to provide a control method of an inverter with adjustable input and output parameters, and aims to solve the problems that the existing inverter adopts carrier fixed frequency, the output frequency is only 50/60Hz, variable frequency adjustment cannot be flexibly realized, and the efficiency of the inverter is inconvenient to adjust.
The embodiment of the invention provides an inverter control method with adjustable input and output parameters, which comprises the following steps: the chip receives input and output parameters, wherein the input and output parameters at least comprise output sine wave frequency, carrier frequency and an output voltage closed loop;
obtaining the number of carrier cycles according to the carrier frequency and the output sine wave frequency; obtaining actual position of table lookup according to the carrier period number and the current carrier period position;
according to the actual position of the table lookup, a reference duty is looked up in a preset reference table, and the reference table at least comprises the reference duty and a reference position;
obtaining an output duty according to the reference duty and the output voltage closed loop; and outputting the output duty through the chip PWM.
Optionally, the carrier frequency is in K hertz, where 1K equals 1024.
Optionally, when the reference table is a degree table other than 360 degree tables, the step of searching for the reference duty in the preset reference table according to the actual position of the table lookup specifically includes the following steps:
d1, obtaining a carrier quadrant according to the actual position of the table lookup, and looking up the reference duty in a preset reference table according to the carrier quadrant.
Optionally, when the reference table is a 90-degree table, the step of searching for the reference duty in a preset reference table according to the carrier quadrant includes the following steps:
d2, when the carrier quadrant integer is 0, searching the reference duty in the reference table according to the ascending order; when the carrier quadrant integer is 1, searching for the reference duty in the reference table according to descending order;
when the carrier quadrant integer is 2, searching for the reference duty in the reference table according to ascending order; and when the carrier quadrant integer is 3, searching the reference duty in the reference table according to descending order.
Alternatively, the reference table is set in 256 points, one point every zero point by three or five degrees.
Alternatively, when the reference table is a 180-degree table, the reference table is set at 512 points, one point every zero point by three or five degrees.
Optionally, when the reference table is a 360-degree table, the reference table is set at 1024 points and one point every zero point by three or five degrees.
In the embodiment of the invention, sine wave duty output can be flexibly realized by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, so that the input and output parameters of the inverter can be adjusted, and the efficiency of adjusting the inverter can be improved.
Drawings
Fig. 1 is a flowchart of a method for controlling an inverter with adjustable input/output parameters according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling an inverter with adjustable input/output parameters according to another embodiment of the present invention;
fig. 3 is a flowchart of a method for controlling an inverter with adjustable input/output parameters according to a further embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiment of the invention, sine wave duty output can be flexibly realized by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, so that the input and output parameters of the inverter can be adjusted, and the efficiency of adjusting the inverter can be improved.
Fig. 1 shows a method for controlling an inverter with adjustable input and output parameters according to an embodiment of the present invention, which includes the following specific steps:
step S201, the chip receives input and output parameters, where the input and output parameters at least include output sine wave frequency, carrier frequency, and output voltage closed loop.
Here, the output sine wave frequency is also referred to as the output sine wave frequency or the output frequency in the industry.
A chip (chip) is a general name for a semiconductor device product. Is a carrier of Integrated Circuit (IC) and is formed by wafer dicing.
The output sine wave frequency provided by the embodiment of the invention is adjustable, and the input parameter is a value amplified by 10 times because the output sine wave frequency is accurate to 0.1Hz, so that the input parameter can be debugged at the pc end by a user and is visual and visible.
The output voltage closed loop, for example, a value obtained by dividing an output ac 220V voltage by a resistor, is an output voltage closed loop, and is also called an output voltage closed loop value, and is usually less than 5V. The output ac voltage 220V or 110V is called the voltage amplitude. The adjustable voltage amplitude refers to closed-loop control according to the closed-loop value of the output voltage.
Step S202, obtaining the number of carrier cycles according to the carrier frequency and the output sine wave frequency.
Sine waves, also referred to in the industry simply as sine waves.
The output sinusoidal waveform frequency, which may also be referred to as the output wave frequency or output waveform frequency Fsine (Hz).
The sine wave carrier frequency is designed to be fcary (khz). According to the calculation, one PWM carrier period Tcarry is 1s/Fcarry is 1, 000, 000us/Fcarry (khz).
And then calculating the number of points corresponding to each frequency, namely the number of carrier cycles. Assuming that the frequency of the output sine wave is Fsine (Hz), the period of the output sine wave is Tsine.
Then the total number of carrier cycles required to invert one cycle of the ac output frequency is equal to the output waveform period divided by the carrier period.
For example, when the ac output frequency is 50hz (Fsine), the carrier frequency is 20kHz (Fcarry), and the carrier period (Tcarry) is 1/Fcarry 1/20kHz, a sinusoidal waveform period (Tsine) is output, which is also referred to as output waveform period (Tsine) 1/Fsine.
Carrier cycle number (PointCnt) ═ Tsine/Tcarry.
Preferably, the entire sine wave is set to 1024 points, such that 256 points are provided every 90 degrees, 512 points are provided every 180 degrees, 1024 points are provided every 360 degrees, and 0.35 degree is provided. Thus, if there is a 90 degree table, the table values of the other 3 quadrants can be obtained by operation.
Preferably, the carrier frequency is in the unit of KHz, which may be 1024 as 1KHz for convenience in sine wave calculation. Because the table inside the program can be calculated based on 256, so that 4 times of calculation is performed between 1024 and 256, and both 256 and 1024 calculations can be directly shifted to the operation processing, thereby increasing the operation speed. At this time, the sine wave carrier frequency is designed to be fcary (khz). According to the calculation, one PWM carrier period Tcarry is 1s/Fcarry is 1, 000, 000us/(Fcarry 1024 Hz).
That is, at this time, the calculation formula of the carrier cycle number is:
and step S203, obtaining the actual position of the table lookup according to the carrier period number and the current carrier period position.
The current carrier cycle position (Curstep) is a variable, and is automatically increased by one every time of calculation, and the value is automatically cleared when the carrier cycle number is reached. The actual position of the lookup table is the actual position in the reference table.
And step S204, searching the reference duty in a preset reference table according to the actual position of the table lookup.
The actual position of the lookup table is the actual position in the reference table.
The reference table is an ordered set of data elements of the same type whose values vary according to the sine value law.
Since the sine wave output is typically 0-360 degrees. It is known that a sine wave is symmetrical every 90 degrees. Therefore, when designing the reference form, we only need to design a 90-degree form, or a 180-degree form, or a 360-degree form. In practice, a table of 180 degrees or other degrees can be obtained with reference to a table of 90 degrees.
Preferably, when the reference table is a 360 degree table, with 1024 as 1KHz, the reference table is still based on a 90 degree table, and the 90 degree table is built in the chip firmware:
the actual position of the look-up table (DPsin) is actually the relative position of the current carrier period position in the entire sine table. I.e. the actual position of the current carrier period position in the 1024 data tables.
The reference duty and the reference carrier period position, referred to as the reference position for short. The difference between the reference position and the actual position of the lookup table is that if the reference position is a non-360-degree table, for example, a 90-degree table, the reference carrier period position is only in a 90-degree range, and the actual position of the lookup table is in a 360-degree range, so that the actual position of the lookup table is divided into 4 quadrants for lookup in the reference carrier period position. Alternatively, the reference position is a data number in which the reference duty is arranged in order in the reference table. He starts at 0 and increments down sequentially.
Preferably, when the table is 360 degrees, the actual table lookup position is the table lookup position.
And S205, obtaining an output duty according to the reference duty and the output voltage closed loop.
Output duty is the reference duty × feedback voltage ratio/256 found in a look-up table.
Ratio of feedback voltage calculation: referred to as feedback voltage ratio. The chip obtains a feedback voltage value through an AD conversion mode, and then calculates according to set parameters of a set main interface to obtain an actual feedback proportional value.
And step S206, outputting the output duty through the chip PWM.
In the embodiment of the invention, sine wave duty output can be flexibly realized by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, so that the input and output parameters of the inverter can be adjusted, and the efficiency of adjusting the inverter can be improved.
Fig. 2 shows another inverter control method with adjustable input/output parameters according to an embodiment of the present invention, which includes the following specific steps:
step S201, the chip receives input and output parameters, where the input and output parameters at least include output sine wave frequency, carrier frequency, and output voltage closed loop.
Here, the output sine wave frequency is also referred to as the output sine wave frequency or the output frequency in the industry.
A chip (chip) is a general name for a semiconductor device product. Is a carrier of Integrated Circuit (IC) and is formed by wafer dicing.
The output sine wave frequency provided by the embodiment of the invention is adjustable, and the input parameter is a value amplified by 10 times because the output sine wave frequency is accurate to 0.1Hz, so that the input parameter can be debugged at the pc end by a user and is visual and visible.
The output voltage closed loop, for example, a value obtained by dividing an output ac 220V voltage by a resistor, is an output voltage closed loop, and is also called an output voltage closed loop value, and is usually less than 5V. The output ac voltage 220V or 110V is called the voltage amplitude. The adjustable voltage amplitude refers to closed-loop control according to the closed-loop value of the output voltage.
Step S202, obtaining the number of carrier cycles according to the carrier frequency and the output sine wave frequency.
Sine waves, also referred to in the industry simply as sine waves.
The output sinusoidal waveform frequency, which may also be referred to as the output wave frequency or output waveform frequency Fsine (Hz).
The sine wave carrier frequency is designed to be fcary (khz). According to the calculation, one PWM carrier period Tcarry is 1s/Fcarry is 1, 000, 000us/Fcarry (khz).
And then calculating the number of points corresponding to each frequency, namely the number of carrier cycles. Assuming that the frequency of the output sine wave is Fsine (Hz), the period of the output sine wave is Tsine.
Then the total number of carrier cycles required to invert one cycle of the ac output frequency is equal to the output waveform period divided by the carrier period.
For example, when the ac output frequency is 50hz (Fsine), the carrier frequency is 20kHz (Fcarry), and the carrier period (Tcarry) is 1/Fcarry 1/20kHz, a sinusoidal waveform period (Tsine) is output, which is also referred to as output waveform period (Tsine) 1/Fsine.
Carrier cycle number (PointCnt) ═ Tsine/Tcarry.
Preferably, the entire sine wave is set to 1024 points, such that 256 points are provided every 90 degrees, 512 points are provided every 180 degrees, 1024 points are provided every 360 degrees, and 0.35 degree is provided. Thus, if there is a 90 degree table, the table values of the other 3 quadrants can be obtained by operation.
Preferably, the carrier frequency is in the unit of KHz, which may be 1024 as 1KHz for convenience in sine wave calculation. Because the table inside the program can be calculated based on 256, so that 4 times of calculation is performed between 1024 and 256, and both 256 and 1024 calculations can be directly shifted to the operation processing, thereby increasing the operation speed. At this time, the sine wave carrier frequency is designed to be fcary (khz). According to the calculation, one PWM carrier period Tcarry is 1s/Fcarry is 1, 000, 000us/(Fcarry 1024 Hz).
That is, at this time, the calculation formula of the carrier cycle number is:
and step S203, obtaining the actual position of the table lookup according to the carrier period number and the current carrier period position.
The current carrier cycle position (Curstep) is a variable, and is automatically increased by one every time of calculation, and the value is automatically cleared when the carrier cycle number is reached. The actual position of the lookup table is the actual position in the reference table.
And step S2041, obtaining a carrier quadrant according to the actual position of the table lookup.
The actual position of the lookup table is the actual position in the reference table.
The reference table is an ordered set of data elements of the same type whose values vary according to the sine value law.
Since the sine wave output is typically 0-360 degrees. It is known that a sine wave is symmetrical every 90 degrees. Therefore, when designing the reference form, we only need to design a 90-degree form, or a 180-degree form, or a 360-degree form. In practice, a table of 180 degrees or other degrees can be obtained with reference to a table of 90 degrees.
Preferably, when the reference table is a 180 degree table, 1024 is taken as 1KHz, and the reference table is still based on a 90 degree table, and the 90 degree table is built in the chip firmware:
the actual position of the look-up table (DPsin) is actually the relative position of the current carrier period position in the entire sine table. This is the actual position of the current carrier period position in the 1024 data sets.
When looking up the table, the distribution points between 0 and 90 degrees are different because of the difference of the frequency. Thus, we have to skip the table lookup in the table. As to how many points to hop each time, how to hop, this is calculated based on the current frequency and the current frequency carrier position. If the current frequency is the current carrier period position (Curstep), the actual position in the designed table, i.e. the actual position of the lookup table, is calculated as
The positive spin is 360 degrees and the reference table is 90 degrees, so the carrier quadrant needs to be calculated. The carrier quadrant is simply the actual position of the carrier lookup table divided by the reference table length 256. The integer obtained by operation is the carrier quadrant, and the remainder is the table lookup position.
The carrier quadrant (sin _ TabLoop) is calculated as:
and step S2042, searching for the reference duty in a preset reference table according to the carrier quadrant.
The reference duty and the reference carrier period position, referred to as the reference position for short. The difference between the reference position and the actual position of the lookup table is that if the reference position is a non-360-degree table, for example, a 90-degree table, the reference carrier period position is only in a 90-degree range, and the actual position of the lookup table is in a 360-degree range, so that the actual position of the lookup table is divided into 4 quadrants for lookup in the reference carrier period position. Alternatively, the reference position is a data number in which the reference duty is arranged in order in the reference table. He starts at 0 and increments down sequentially.
Preferably, when the table is 180 degrees, at this time, if the actual position of the table lookup is greater than the length of the table, the difference value obtained by subtracting the length of the table from the actual position of the table lookup is the table lookup position; if the actual position of the table lookup is not larger than the length of the table, the actual position of the table lookup is the table lookup position.
And S205, obtaining an output duty according to the reference duty and the output voltage closed loop.
Output duty is the reference duty × feedback voltage ratio/256 found in a look-up table.
Ratio of feedback voltage calculation: referred to as feedback voltage ratio. The chip obtains a feedback voltage value through an AD conversion mode, and then calculates according to set parameters of a set main interface to obtain an actual feedback proportional value.
And step S206, outputting the output duty through the chip PWM.
In the embodiment of the invention, sine wave duty output can be flexibly realized by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, so that the input and output parameters of the inverter can be adjusted, and the efficiency of adjusting the inverter can be improved.
Fig. 3 shows a further inverter control method with adjustable input/output parameters according to an embodiment of the present invention, where a specific method flow is as follows:
step S201, the chip receives input and output parameters, where the input and output parameters at least include output sine wave frequency, carrier frequency, and output voltage closed loop.
Here, the output sine wave frequency is also referred to as the output sine wave frequency or the output frequency in the industry.
A chip (chip) is a general name for a semiconductor device product. Is a carrier of Integrated Circuit (IC) and is formed by wafer dicing.
The output sine wave frequency provided by the embodiment of the invention is adjustable, and the input parameter is a value amplified by 10 times because the output sine wave frequency is accurate to 0.1Hz, so that the input parameter can be debugged at the pc end by a user and is visual and visible.
The output voltage closed loop, for example, a value obtained by dividing an output ac 220V voltage by a resistor, is an output voltage closed loop, and is also called an output voltage closed loop value, and is usually less than 5V. The output ac voltage 220V or 110V is called the voltage amplitude. The adjustable voltage amplitude refers to closed-loop control according to the closed-loop value of the output voltage.
Step S202, obtaining the number of carrier cycles according to the carrier frequency and the output sine wave frequency.
Sine waves, also referred to in the industry simply as sine waves.
The output sinusoidal waveform frequency, which may also be referred to as the output wave frequency or output waveform frequency Fsine (Hz).
The sine wave carrier frequency is designed to be fcary (khz). According to the calculation, one PWM carrier period Tcarry is 1s/Fcarry is 1, 000, 000us/Fcarry (khz).
And then calculating the number of points corresponding to each frequency, namely the number of carrier cycles. Assuming that the frequency of the output sine wave is Fsine (Hz), the period of the output sine wave is Tsine.
Then the total number of carrier cycles required to invert one cycle of the ac output frequency is equal to the output waveform period divided by the carrier period.
For example, when the ac output frequency is 50hz (Fsine), the carrier frequency is 20kHz (Fcarry), and the carrier period (Tcarry) is 1/Fcarry 1/20kHz, a sinusoidal waveform period (Tsine) is output, which is also referred to as output waveform period (Tsine) 1/Fsine.
Carrier cycle number (PointCnt) ═ Tsine/Tcarry.
Preferably, the entire sine wave is set to 1024 points, such that 256 points are provided every 90 degrees, 512 points are provided every 180 degrees, 1024 points are provided every 360 degrees, and 0.35 degree is provided. Thus, if there is a 90 degree table, the table values of the other 3 quadrants can be obtained by operation.
Preferably, the carrier frequency is in the unit of KHz, which may be 1024 as 1KHz for convenience in sine wave calculation. Because the table inside the program can be calculated based on 256, so that 4 times of calculation is performed between 1024 and 256, and both 256 and 1024 calculations can be directly shifted to the operation processing, thereby increasing the operation speed. At this time, the sine wave carrier frequency is designed to be fcary (khz). According to the calculation, one PWM carrier period Tcarry is 1s/Fcarry is 1, 000, 000us/(Fcarry 1024 Hz).
That is, at this time, the calculation formula of the carrier cycle number is:
and step S203, obtaining the actual position of the table lookup according to the carrier period number and the current carrier period position.
The current carrier cycle position (Curstep) is a variable, and is automatically increased by one every time of calculation, and the value is automatically cleared when the carrier cycle number is reached. The actual position of the lookup table is the actual position in the reference table.
And step S2041, obtaining a carrier quadrant according to the actual position of the table lookup.
The actual position of the lookup table is the actual position in the reference table.
The reference table is an ordered set of data elements of the same type whose values vary according to the sine value law.
Since the sine wave output is typically 0-360 degrees. It is known that a sine wave is symmetrical every 90 degrees. Therefore, when designing the reference form, we only need to design a 90-degree form, or a 180-degree form, or a 360-degree form. In practice, a table of 180 degrees or other degrees can be obtained with reference to a table of 90 degrees.
Preferably, when the reference table is a 180 degree table, with 1024 as 1KHz, the reference table is built into the chip firmware:
the actual position of the look-up table (DPsin) is actually the relative position of the current carrier period position in the entire sine table. This is the actual position of the current carrier period position in the 1024 data sets.
When looking up the table, the distribution points between 0 and 90 degrees are different because of the difference of the frequency. Thus, we have to skip the table lookup in the table. As to how many points to hop each time, how to hop, this is calculated based on the current frequency and the current frequency carrier position. If the current frequency is the current carrier period position (Curstep), the actual position in the designed table, i.e. the actual position of the lookup table, is calculated as
The positive spin is 360 degrees and the reference table is 90 degrees, so the carrier quadrant needs to be calculated. The carrier quadrant is simply the actual position of the carrier lookup table divided by the reference table length 256. The integer obtained by operation is the carrier quadrant, and the remainder is the table lookup position.
The carrier quadrant (sin _ TabLoop) is calculated as:
in step S2043, since the value calculated by the formula in step S2041 is that the actual position of the table is within the whole period range of 0-360 degrees, and our actual table is within the range of 0-90 degrees, we must also convert the point calculated by the above table into which specific 90-degree range of the sine wave, and the formula is as follows:
and calculating to obtain the quadrant and the position of the sensor. Where the integer is the quadrant and the remainder is the position.
When the sin _ TabLoop integer is 0, the sin _ TabLoop integer is in the range of 0-90 degrees, and the table is looked up according to increasing sorting to obtain the reference duty.
When the sin _ TabLoop integer is 1, the range is 90-180 degrees, and the reference duty is obtained by looking up the table according to descending sorting.
When the sin _ TabLoop integer is 2, the range is 180 DEG and 270 DEG, and the table is looked up according to the ascending sorting to obtain the reference duty.
When the sin _ TabLoop integer is 3, the range is 270-.
The reference duty and the reference carrier period position, referred to as the reference position for short. The difference between the reference position and the actual position of the lookup table is that if the reference position is a non-360-degree table, for example, a 90-degree table, the reference carrier period position is only in a 90-degree range, and the actual position of the lookup table is in a 360-degree range, so that the actual position of the lookup table is divided into 4 quadrants for lookup in the reference carrier period position. Alternatively, the reference position is a data number in which the reference duty is arranged in order in the reference table. He starts at 0 and increments down sequentially. If the table is a 360-degree table, the reference position is consistent with the actual position of the lookup table.
And S205, obtaining an output duty according to the reference duty and the output voltage closed loop.
Output duty is the reference duty × feedback voltage ratio/256 found in a look-up table.
Ratio of feedback voltage calculation: referred to as feedback voltage ratio. The chip obtains a feedback voltage value through an AD conversion mode, and then calculates according to set parameters of a set main interface to obtain an actual feedback proportional value.
And step S206, outputting the output duty through the chip PWM.
In the embodiment of the invention, sine wave duty output can be flexibly realized by inputting more than 3 parameters such as sine wave frequency, carrier frequency, output voltage closed loop and the like, so that the input and output parameters of the inverter can be adjusted, and the efficiency of adjusting the inverter can be improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The control method of the inverter with adjustable input and output parameters is characterized by comprising the following steps:
the chip receives input and output parameters, wherein the input and output parameters at least comprise output sine wave frequency, carrier frequency and output voltage closed-loop value; the whole sine wave is set to be 1024 sampling points, the unit of the carrier frequency is KHz, and the carrier frequency takes 1024Hz as 1 KHz;
obtaining the number of carrier cycles according to the carrier frequency and the output sine wave frequency, wherein the calculation formula of the number of carrier cycles is as follows:
obtaining a table lookup actual position according to the carrier period number and the current carrier period position, wherein a calculation formula of the table lookup actual position is as follows:
wherein CurStep is the current carrier cycle position;
according to the actual position of the table lookup, looking up a reference duty in a preset reference table; when the reference table is a table with other degrees except for 360-degree tables, a carrier quadrant is obtained according to the actual position of the table lookup, and the calculation formula of the carrier quadrant is as follows:
according to the carrier quadrant, searching a reference duty in a preset reference table; wherein the reference table includes at least the reference duty and a reference position, and the reference table is based on a table of 90 degrees and is based on a sine wave set as 1024 sampling points;
obtaining an output duty according to the reference duty and the output voltage closed-loop value, wherein a calculation formula of the output duty is as follows:
output duty × feedback voltage ratio/256;
and outputting the output duty through the chip PWM.
2. The method for controlling an inverter with adjustable input/output parameters according to claim 1, wherein the reference table is a 90-degree table, and the step of searching for the reference duty in the preset reference table according to the carrier quadrant includes the following steps:
when the carrier quadrant integer is 0, searching for the reference duty in the reference table according to ascending order;
when the carrier quadrant integer is 1, searching for the reference duty in the reference table according to descending order;
when the carrier quadrant integer is 2, searching for the reference duty in the reference table according to ascending order;
and when the carrier quadrant integer is 3, searching the reference duty in the reference table according to descending order.
3. The method of controlling an inverter whose input-output parameters are adjustable according to claim 2, wherein the reference table is set at 256 points, one point every three and five degrees of zero.
4. The method of controlling an inverter with adjustable input/output parameters according to claim 1, wherein the reference table is a 180-degree table, and the reference table is set at 512 points, one point every zero point by three or five degrees.
5. The method of controlling an inverter with adjustable input/output parameters according to claim 1, wherein the reference table is a 360-degree table, and the reference table is set at 1024 points, one point every zero point by three or five degrees.
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| CN106787921A (en) | 2017-05-31 |
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