CN110138255A - A kind of adjustable inverter control method of input/output argument - Google Patents
A kind of adjustable inverter control method of input/output argument Download PDFInfo
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- CN110138255A CN110138255A CN201910551030.4A CN201910551030A CN110138255A CN 110138255 A CN110138255 A CN 110138255A CN 201910551030 A CN201910551030 A CN 201910551030A CN 110138255 A CN110138255 A CN 110138255A
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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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention is suitable for electronic technology field, provide a kind of adjustable inverter control method of input/output argument, the following steps are included: chip receives input/output argument, including at least output sine wave freuqency, carrier frequency and output voltage closed loop, physical location of tabling look-up is obtained after obtaining carrier cycle issue, benchmark duty is searched in pre-set benchmark table, the benchmark table includes at least the benchmark duty and base position, output duty is obtained, the output duty is exported by the chip PWM.The present invention passes through 3 or more the parameters such as input sine wave frequency, carrier frequency and output voltage closed loop, so that it may and it is flexible to realize dextrorotation wave duty output, to realize that the input/output argument of inverter is adjustable, it is beneficial to raising and adjusts inverter efficiency.
Description
Technical field
The invention belongs to electronic field more particularly to a kind of adjustable inverter control methods of input/output argument.
Background technique
Inverter is that direct current energy (battery, battery) is transformed into alternating current (generally 220V, 50Hz sine wave).It
It is made of inverter bridge, control logic and filter circuit.It is widely used in air-conditioning, home theater, electric wheel, electric tool, seam
It threads machine, DVD, VCD, computer, TV, washing machine, smoke exhaust ventilator, refrigerator, video recorder, massager, fan, illumination etc..In foreign countries
Because the i.e. available inverter connection battery of the higher outgoing work of the popularity rate of automobile or out on tours drives electric appliance and various tools
Work.It is 20W, 40W, 80W, 120W to 150W power requirements by the vehicle-mounted inversion that cigar lighter exports.Larger power is inverse again
Variable power source will be connected on storage battery by connecting line.The output end that household electrical appliance are connected to power adapter can be made in automobile
With various electric appliances.Workable electric appliance has: mobile phone, laptop, DV, camera, headlamp, electric razor
Knife, CD player, game machine, palm PC, electric tool, car refrigerator and it is various travel, camp, medical first aid electric appliance etc..
Currently, common inverter has in the market:
Square-wave inverter: square-wave inverter output is square wave alternating-current electricity, its positive maximum value and maximum negative value are almost
It generates simultaneously, very big de-stabilising effect is caused to load and inverter itself, waveform quality is poor, and load capacity is poor, only
For the 40-60% of nominal load, not energy band inductive load.
Dextrorotation wave inverter: sinewave inverter output be with our power grids used in everyday it is the same even preferably just
String alternating current wave, the harmonic pollution to power grid is not present in it.
PWM:PWM (Pulse Width Modulation) control --- pulse width modulating technology, by a series of
The width of pulse is modulated, equally to obtain required waveform (containing shape and amplitude).PWM control technology is in inverter circuit
In it is most widely used, the inverter circuit of application is mostly PWM type, be widely used in from measurement, communicate to power control and become
In many fields changed.
SPWM: so-called SPWM, modulation pulse mode, pulse width time duty ratio are exactly changed on the basis of PWM
It is arranged by sinusoidal rule, such output waveform can accomplish sinewave output by filtering appropriate.It is widely used for direct current
AC inverter etc., such as more advanced UPS are exactly an example.Three-phase SPWM is defeated using the three-phase of SPWM simulation alternating current
Out, it is widely used in frequency converter field.
Technology relevant to inverter includes:
PWM: being exactly pulse width modulation.
PWM cycle: the period of PWM includes high level part and low level part therein.
PWM DUTY:pwm duty is exactly the time span of significant level in a pulse period.
Duty ratio: pwm duty ratio is exactly the ratio that institute's whole cycle of high level in a pulse period accounts for.Such as 1 second
Low level PWM wave duty ratio is 50% within high level 1 second.
MOSFET Metal-Oxide Semiconductor field effect transistor, abbreviation metal-oxide half field effect transistor (Metal-Oxide-
Semiconductor Field-Effect Transistor, MOSFET): be one kind can be widely used in analog circuit with
The field-effect transistor (field-effect transistor) of digital circuit.MOSFET is according to its " channel " (work carrier)
Polarity it is different, the two types of " N-type " Yu " p-type ", also commonly known as NMOSFET and PMOSFET can be divided into, other abbreviations are still
Including NMOS, PMOS etc..
IGBT (Insulated Gate Bipolar Transistor), insulated gate bipolar transistor is (double by BJT
Polar form triode) and MOS (insulating gate type field effect tube) composition compound full-control type voltage driven type power semiconductor.
MOSFET abbreviation MOS, it and IGBT are mainly realized direct current just by their HF switch in inverter
The exchange output of string wave.
For the inverter of current market using carrier wave fixed frequency, output frequency only has 50/60Hz, and cannot be flexible
Realization variable frequency adjustment, this to adjust inverter efficiency it is very inconvenient.
Embodiment provided by the invention is directed to disadvantages described above, passes through input sine wave frequency, carrier frequency and output voltage
Closed loop etc. 3 or more parameters, so that it may it is flexible to realize sine wave duty output, to realize the input/output argument of inverter
It is adjustable, it is beneficial to improve adjusting inverter efficiency.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of adjustable inverter control method of input/output argument, it is intended to solve
For certainly existing inverter using carrier wave fixed frequency, output frequency only has 50/60Hz, and cannot flexibly realize frequency conversion tune
Section, to the problem for adjusting inverter efficiency inconvenience.
The embodiment of the present invention provides a kind of adjustable inverter control method of input/output argument, comprising the following steps: core
Piece receives input/output argument, and the input/output argument includes at least output sine wave freuqency, carrier frequency and output voltage
Closed loop；
According to the carrier frequency and the output sine wave freuqency, carrier cycle issue is obtained；According to the carrier cycle
Several and current carrier period position obtains physical location of tabling look-up；
According to the physical location of tabling look-up, benchmark duty, the benchmark table are searched in pre-set benchmark table
Including at least the benchmark duty and base position；
According to the benchmark duty and the output voltage closed loop, output duty is obtained；The output duty is passed through into institute
State chip PWM output.
Optionally, the carrier frequency unit is K hertz, wherein 1K is equal to 1024.
Optionally, described to table look-up according to when other degree tables other than the benchmark table is 360 degree of tables
Physical location is searched benchmark duty in pre-set benchmark table, is specifically comprised the following steps:
D1, physical location of tabling look-up according to obtain carrier wave quadrant, according to the carrier wave quadrant, in pre-set base
Benchmark duty is searched in quasi- table.
Optionally, described according to the carrier wave quadrant when the benchmark table is 90 degree of tables, in pre-set base
Benchmark duty is searched in quasi- table, is specifically comprised the following steps:
D2, when the carrier wave quadrant integer be 0 when, benchmark duty is searched in the benchmark table by sort ascending；When
When the carrier wave quadrant integer is 1, benchmark duty is searched in the benchmark table by sort descending；
When the carrier wave quadrant integer is 2, benchmark duty is searched in the benchmark table by sort ascending；When described
When carrier wave quadrant integer is 3, benchmark duty is searched in the benchmark table by sort descending.
Optionally, the benchmark table is arranged according to 256 points, every 0. 35 degree of points.
Optionally, when the benchmark table is 180 degree table, the benchmark table is according to 512 points, every 0. 35
Spend a point setting.
Optionally, when the benchmark table is 360 degree of tables, the benchmark table is according to 1024 points, every 0. 3
Five degree of point settings.
In embodiments of the present invention, by input sine wave frequency, carrier frequency and output voltage closed loop etc. 3 or more join
Number, so that it may it is flexible to realize sine wave duty output, to realize that the input/output argument of inverter is adjustable, it is beneficial to improve
Adjust inverter efficiency.
Detailed description of the invention
Fig. 1 is the method flow diagram of the adjustable inverter control method of input/output argument provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides the adjustable inverter control method of input/output argument method flow
Figure；
Fig. 3 is the method flow of the adjustable inverter control method of input/output argument that embodiment provides again of the present invention one
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In embodiments of the present invention, by input sine wave frequency, carrier frequency and output voltage closed loop etc. 3 or more join
Number, so that it may it is flexible to realize sine wave duty output, to realize that the input/output argument of inverter is adjustable, it is beneficial to improve
Adjust inverter efficiency.
Fig. 1 shows the adjustable inverter control method of a kind of input/output argument provided in an embodiment of the present invention, tool
Body method process is as follows:
Step S201, chip receive input/output argument, the input/output argument include at least output sine wave freuqency,
Carrier frequency and output voltage closed loop.
Wherein, sine wave freuqency is exported, industry also referred to as exports string wave frequency rate or output frequency.
Chip (chip) is exactly the general designation of semiconductor element product.It is integrated circuit (IC, integrated circuit)
Carrier, be split to form by wafer.
Output string wave frequency rate provided in an embodiment of the present invention is adjustable, and due to being accurate to 0.1Hz, input parameter is amplification
10 times of value can be debugged by user at the end pc, intuitive visible.
Output voltage closed loop, for example, output alternating current 220V voltage, the value obtained by electric resistance partial pressure is exactly output voltage
Closed loop is also output voltage closed loop value, usually in 5V or less.Output AC voltage 220V or 110V are called voltage magnitude.Electricity
Pressure amplitude value is adjustable to be referred to according to output voltage closed loop value closed-loop control.
Step S202 obtains carrier cycle issue according to the carrier frequency and the output sine wave freuqency.
Sine wave, industry are also referred to as string wave.
Sinusoidal waveform frequency is exported, alternatively referred to as output wave frequency rate or output waveform frequency Fsine (Hz).
Sine wave carrier frequency is designed as Fcarry (KHz).According to calculating, a PWM carrier cycle Tcarry=1s/
Fcarry=1,000,000us/Fcarry (KHz).
Then points corresponding to each frequency, i.e. carrier cycle issue are calculated.Assuming that output sine wave freuqency is Fsine
(Hz), then exporting the sinusoidal waveform period is Tsine.
So a cycle of inversion ac output frequency has the carrier cycle issue needed altogether and removes equal to the output waveform period
With carrier cycle.
For example, work as ac output frequency 50Hz (Fsine), and carrier frequency 20kHz (Fcarry), carrier cycle (Tcarry)
=1/Fcarry=1/20kHz exports sinusoidal waveform period, also referred to as output waveform period (Tsine)=1/Fsine.
Carrier cycle issue (PointCnt)=Tsine/Tcarry.
Preferably, 1024 points are set by entire sine wave, every in this way 90 degree are exactly 256 points, and every 180 degree is exactly
512 points, every 360 degree are exactly 1024 points, are 0.35 degree of point.In this way, if there is 90 degree of tables, so that it may pass through
Operation obtains the table values of other 3 quadrants.
Preferably, carrier frequency unit is KHz, and in order to convenient when sine wave calculates, this KHz can make with 1024
For 1KHz.It is 4 times of calculating between such 1024 and 256 because the table inside program can be based on 256 and calculate, and
And 256 and 1024 calculate and can directly shift operation handle, to increase arithmetic speed.At this point, sine wave carrier frequency is set
It is calculated as Fcarry (kHz).According to calculating, a PWM carrier cycle Tcarry=1s/Fcarry=1,000,000us/
(Fcarry*1024Hz)。
I.e. at this point, the calculation formula of carrier cycle issue are as follows:
Step S203 obtains physical location of tabling look-up according to the carrier cycle issue and current carrier period position.
Wherein, current carrier period position (CurStep) is a variable, every to calculate primary automatic increase by one, and numerical value reaches
Automatic clear when carrier cycle issue.Physical location of tabling look-up refers to the physical location in benchmark table.
Step S204 searches benchmark duty according to the physical location of tabling look-up in pre-set benchmark table.
Wherein, physical location of tabling look-up refers to the physical location in benchmark table.
Benchmark table is the ordered set with the data element composition of same type, and the value of these data elements is according to just
The variation of string value rule.
Since sinewave output is usually 0-360 degree.It is known that every 90 degree of sine wave are all symmetrical.So setting
When counting benchmark table, as long as we design one 90 degree of table or the table of 180 degree or one 360 degree
Table can.In fact, the table of 180 degree or other degrees, can be obtained on the basis of 90 degree of table.
Preferably, when benchmark table is 360 degree of tables, using 1024 as 1KHz, this benchmark table is still with 90 degree of tables
On the basis of lattice, which is built in chip firmware:
Physical location of tabling look-up (DPsin) is exactly opposite position of the current carrier period position in entire sinusoidal table in fact
It sets.Namely physical location of the current carrier period position in 1024 data of table.
Benchmark duty and reference carrier period position, abbreviation base position.Difference of the base position with physical location of tabling look-up
It is, if it is non-360 degree table, e.g. 90 degree of tables, then reference carrier period position only has 90 degree of ranges, and reality of tabling look-up
Border position is 360 degree of ranges, so physical location of tabling look-up will divide 4 quadrants to table look-up in reference carrier period position.In other words,
Base position is that benchmark duty is arranged in order the data sequence number to get off in benchmark table.He since 0 down sequentially.
Preferably, when table is 360 degree, physical location of tabling look-up is exactly that table is tabled look-up position.
Step S205 obtains output duty according to the benchmark duty and the output voltage closed loop.
Benchmark duty × feedback voltage ratio/256 that output duty=tables look-up.
The ratio that feedback voltage calculates: abbreviation feedback voltage ratio.Chip obtains feedback voltage level by AD conversion mode,
Then the ratio value of actual feedback is calculated according to the setup parameter of setting main interface.
Step S206 exports the output duty by the chip PWM.
In embodiments of the present invention, by input sine wave frequency, carrier frequency and output voltage closed loop etc. 3 or more join
Number, so that it may it is flexible to realize sine wave duty output, to realize that the input/output argument of inverter is adjustable, it is beneficial to improve
Adjust inverter efficiency.
Fig. 2 shows another adjustable inverter control method of input/output argument provided in an embodiment of the present invention, tools
Body method process is as follows:
Step S201, chip receive input/output argument, the input/output argument include at least output sine wave freuqency,
Carrier frequency and output voltage closed loop.
Wherein, sine wave freuqency is exported, industry also referred to as exports string wave frequency rate or output frequency.
Chip (chip) is exactly the general designation of semiconductor element product.It is integrated circuit (IC, integrated circuit)
Carrier, be split to form by wafer.
Output string wave frequency rate provided in an embodiment of the present invention is adjustable, and due to being accurate to 0.1Hz, input parameter is amplification
10 times of value can be debugged by user at the end pc, intuitive visible.
Output voltage closed loop, for example, output alternating current 220V voltage, the value obtained by electric resistance partial pressure is exactly output voltage
Closed loop is also output voltage closed loop value, usually in 5V or less.Output AC voltage 220V or 110V are called voltage magnitude.Electricity
Pressure amplitude value is adjustable to be referred to according to output voltage closed loop value closed-loop control.
Step S202 obtains carrier cycle issue according to the carrier frequency and the output sine wave freuqency.
Sine wave, industry are also referred to as string wave.
Sinusoidal waveform frequency is exported, alternatively referred to as output wave frequency rate or output waveform frequency Fsine (Hz).
Sine wave carrier frequency is designed as Fcarry (KHz).According to calculating, a PWM carrier cycle Tcarry=1s/
Fcarry=1,000,000us/Fcarry (KHz).
Then points corresponding to each frequency, i.e. carrier cycle issue are calculated.Assuming that output sine wave freuqency is Fsine
(Hz), then exporting the sinusoidal waveform period is Tsine.
So a cycle of inversion ac output frequency has the carrier cycle issue needed altogether and removes equal to the output waveform period
With carrier cycle.
For example, work as ac output frequency 50Hz (Fsine), and carrier frequency 20kHz (Fcarry), carrier cycle (Tcarry)
=1/Fcarry=1/20kHz exports sinusoidal waveform period, also referred to as output waveform period (Tsine)=1/Fsine.
Carrier cycle issue (PointCnt)=Tsine/Tcarry.
Preferably, 1024 points are set by entire sine wave, every in this way 90 degree are exactly 256 points, and every 180 degree is exactly
512 points, every 360 degree are exactly 1024 points, are 0.35 degree of point.In this way, if there is 90 degree of tables, so that it may pass through
Operation obtains the table values of other 3 quadrants.
Preferably, carrier frequency unit is KHz, and in order to convenient when sine wave calculates, this KHz can make with 1024
For 1KHz.It is 4 times of calculating between such 1024 and 256 because the table inside program can be based on 256 and calculate, and
And 256 and 1024 calculate and can directly shift operation handle, to increase arithmetic speed.At this point, sine wave carrier frequency is set
It is calculated as Fcarry (kHz).According to calculating, a PWM carrier cycle Tcarry=1s/Fcarry=1,000,000us/
(Fcarry*1024Hz)。
I.e. at this point, the calculation formula of carrier cycle issue are as follows:
Step S203 obtains physical location of tabling look-up according to the carrier cycle issue and current carrier period position.
Wherein, current carrier period position (CurStep) is a variable, every to calculate primary automatic increase by one, and numerical value reaches
Automatic clear when carrier cycle issue.Physical location of tabling look-up refers to the physical location in benchmark table.
Step S2041 obtains carrier wave quadrant according to the physical location of tabling look-up.
Wherein, physical location of tabling look-up refers to the physical location in benchmark table.
Benchmark table is the ordered set with the data element composition of same type, and the value of these data elements is according to just
The variation of string value rule.
Since sinewave output is usually 0-360 degree.It is known that every 90 degree of sine wave are all symmetrical.So setting
When counting benchmark table, as long as we design one 90 degree of table or the table of 180 degree or one 360 degree
Table can.In fact, the table of 180 degree or other degrees, can be obtained on the basis of 90 degree of table.
Preferably, when benchmark table is 180 degree table, using 1024 as 1KHz, this benchmark table is still with 90 degree of tables
On the basis of lattice, which is built in chip firmware:
Physical location of tabling look-up (DPsin) is exactly opposite position of the current carrier period position in entire sinusoidal table in fact
It sets.It is in fact exactly physical location of the current carrier period position in 1024 data of table.
When tabling look-up, because of the difference of frequency, the distribution points between 0-90 degree are also different.In this way, I
Must just jump and table look-up in the table.As for how many point that jump every time, how to jump, this just according to current frequency and is worked as
Preceding frequency carrier position is let it pass.If under current frequency, the point to be tabled look-up i.e. current carrier period position (CurStep), that
Physical location in the table of design is that the table look-up calculation formula of physical location is
Dextrorotation wave is 360 degree, and benchmark table is 90 degree, so needing to calculate carrier wave quadrant.Carrier wave quadrant is exactly with load
The physical location of tabling look-up of wave is divided by benchmark form length 256.The integer that operation obtains is exactly carrier wave quadrant, and remainder is exactly table
Lattice are tabled look-up position.
The calculation formula of carrier wave quadrant (sin_TabLoop) are as follows:
Step S2042 searches benchmark duty according to the carrier wave quadrant in pre-set benchmark table.
Benchmark duty and reference carrier period position, abbreviation base position.Difference of the base position with physical location of tabling look-up
It is, if it is non-360 degree table, e.g. 90 degree of tables, then reference carrier period position only has 90 degree of ranges, reality of tabling look-up
Position is 360 degree of ranges, so physical location of tabling look-up will divide 4 quadrants to table look-up in reference carrier period position.In other words, base
It is that benchmark duty is arranged in order the data sequence number to get off in benchmark table that level, which is set,.He since 0 down sequentially.
Preferably, when table is 180 degree, at this point, if physical location of tabling look-up is greater than form length, with actual bit of tabling look-up
Setting and subtracting the difference of form length is exactly that table is tabled look-up position；If physical location of tabling look-up is not more than form length, reality of tabling look-up
Position is exactly that table is tabled look-up position.
Step S205 obtains output duty according to the benchmark duty and the output voltage closed loop.
Benchmark duty × feedback voltage ratio/256 that output duty=tables look-up.
The ratio that feedback voltage calculates: abbreviation feedback voltage ratio.Chip obtains feedback voltage level by AD conversion mode,
Then the ratio value of actual feedback is calculated according to the setup parameter of setting main interface.
Step S206 exports the output duty by the chip PWM.
In embodiments of the present invention, by input sine wave frequency, carrier frequency and output voltage closed loop etc. 3 or more join
Number, so that it may it is flexible to realize sine wave duty output, to realize that the input/output argument of inverter is adjustable, it is beneficial to improve
Adjust inverter efficiency.
Fig. 3 shows the adjustable inverter control method of another input/output argument provided in an embodiment of the present invention, tool
Body method process is as follows:
Step S201, chip receive input/output argument, the input/output argument include at least output sine wave freuqency,
Carrier frequency and output voltage closed loop.
Wherein, sine wave freuqency is exported, industry also referred to as exports string wave frequency rate or output frequency.
Chip (chip) is exactly the general designation of semiconductor element product.It is integrated circuit (IC, integrated circuit)
Carrier, be split to form by wafer.
Output string wave frequency rate provided in an embodiment of the present invention is adjustable, and due to being accurate to 0.1Hz, input parameter is amplification
10 times of value can be debugged by user at the end pc, intuitive visible.
Output voltage closed loop, for example, output alternating current 220V voltage, the value obtained by electric resistance partial pressure is exactly output voltage
Closed loop is also output voltage closed loop value, usually in 5V or less.Output AC voltage 220V or 110V are called voltage magnitude.Electricity
Pressure amplitude value is adjustable to be referred to according to output voltage closed loop value closed-loop control.
Step S202 obtains carrier cycle issue according to the carrier frequency and the output sine wave freuqency.
Sine wave, industry are also referred to as string wave.
Sinusoidal waveform frequency is exported, alternatively referred to as output wave frequency rate or output waveform frequency Fsine (Hz).
Sine wave carrier frequency is designed as Fcarry (KHz).According to calculating, a PWM carrier cycle Tcarry=1s/
Fcarry=1,000,000us/Fcarry (KHz).
Then points corresponding to each frequency, i.e. carrier cycle issue are calculated.Assuming that output sine wave freuqency is Fsine
(Hz), then exporting the sinusoidal waveform period is Tsine.
So a cycle of inversion ac output frequency has the carrier cycle issue needed altogether and removes equal to the output waveform period
With carrier cycle.
For example, work as ac output frequency 50Hz (Fsine), and carrier frequency 20kHz (Fcarry), carrier cycle (Tcarry)
=1/Fcarry=1/20kHz exports sinusoidal waveform period, also referred to as output waveform period (Tsine)=1/Fsine.
Carrier cycle issue (PointCnt)=Tsine/Tcarry.
Preferably, 1024 points are set by entire sine wave, every in this way 90 degree are exactly 256 points, and every 180 degree is exactly
512 points, every 360 degree are exactly 1024 points, are 0.35 degree of point.In this way, if there is 90 degree of tables, so that it may pass through
Operation obtains the table values of other 3 quadrants.
Preferably, carrier frequency unit is KHz, and in order to convenient when sine wave calculates, this KHz can make with 1024
For 1KHz.It is 4 times of calculating between such 1024 and 256 because the table inside program can be based on 256 and calculate, and
And 256 and 1024 calculate and can directly shift operation handle, to increase arithmetic speed.At this point, sine wave carrier frequency is set
It is calculated as Fcarry (kHz).According to calculating, a PWM carrier cycle Tcarry=1s/Fcarry=1,000,000us/
(Fcarry*1024Hz)。
I.e. at this point, the calculation formula of carrier cycle issue are as follows:
Step S203 obtains physical location of tabling look-up according to the carrier cycle issue and current carrier period position.
Wherein, current carrier period position (CurStep) is a variable, every to calculate primary automatic increase by one, and numerical value reaches
Automatic clear when carrier cycle issue.Physical location of tabling look-up refers to the physical location in benchmark table.
Step S2041 obtains carrier wave quadrant according to the physical location of tabling look-up.
Wherein, physical location of tabling look-up refers to the physical location in benchmark table.
Benchmark table is the ordered set with the data element composition of same type, and the value of these data elements is according to just
The variation of string value rule.
Since sinewave output is usually 0-360 degree.It is known that every 90 degree of sine wave are all symmetrical.So setting
When counting benchmark table, as long as we design one 90 degree of table or the table of 180 degree or one 360 degree
Table can.In fact, the table of 180 degree or other degrees, can be obtained on the basis of 90 degree of table.
Preferably, when benchmark table is 180 degree table, using 1024 as 1KHz, this benchmark table is to be built in chip
In firmware:
Physical location of tabling look-up (DPsin) is exactly opposite position of the current carrier period position in entire sinusoidal table in fact
It sets.It is in fact exactly physical location of the current carrier period position in 1024 data of table.
When tabling look-up, because of the difference of frequency, the distribution points between 0-90 degree are also different.In this way, I
Must just jump and table look-up in the table.As for how many point that jump every time, how to jump, this just according to current frequency and is worked as
Preceding frequency carrier position is let it pass.If under current frequency, the point to be tabled look-up i.e. current carrier period position (CurStep), that
Physical location in the table of design is that the table look-up calculation formula of physical location is
Dextrorotation wave is 360 degree, and benchmark table is 90 degree, so needing to calculate carrier wave quadrant.Carrier wave quadrant is exactly with load
The physical location of tabling look-up of wave is divided by benchmark form length 256.The integer that operation obtains is exactly carrier wave quadrant, and remainder is exactly table
Lattice are tabled look-up position.
The calculation formula of carrier wave quadrant (sin_TabLoop) are as follows:
Step S2043, because the value that the formula in step S2041 calculates is that table physical location is entirely all in 0-360 degree
Within the scope of phase, and our actual table is 0-90 degree range, so the point that table above must also be calculated for we
It is as follows to be converted to which specific 90 degree of range, formula in sine wave:
Quadrant and position where being calculated.Wherein, integer is quadrant, and remainder is position.
When sin_TabLoop integer is 0, it is 0-90 degree range, tables look-up by sort ascending, obtains benchmark duty.
When sin_TabLoop integer is 1, it is 90-180 degree range, tables look-up by sort descending, obtains benchmark
duty。
When sin_TabLoop integer is 2, it is 180-270 degree range, tables look-up by sort ascending, obtains benchmark
duty。
When sin_TabLoop integer is 3, it is 270-360 degree range, tables look-up by sort descending, obtains benchmark
duty。
Benchmark duty and reference carrier period position, abbreviation base position.Difference of the base position with physical location of tabling look-up
It is, if it is non-360 degree table, e.g. 90 degree of tables, then reference carrier period position only has 90 degree of ranges, reality of tabling look-up
Position is 360 degree of ranges, so physical location of tabling look-up will divide 4 quadrants to table look-up in reference carrier period position.In other words, base
It is that benchmark duty is arranged in order the data sequence number to get off in benchmark table that level, which is set,.He since 0 down sequentially.If
It is 360 degree of tables, then base position is consistent with physical location of tabling look-up.
Step S205 obtains output duty according to the benchmark duty and the output voltage closed loop.
Benchmark duty × feedback voltage ratio/256 that output duty=tables look-up.
The ratio that feedback voltage calculates: abbreviation feedback voltage ratio.Chip obtains feedback voltage level by AD conversion mode,
Then the ratio value of actual feedback is calculated according to the setup parameter of setting main interface.
Step S206 exports the output duty by the chip PWM.
In embodiments of the present invention, by input sine wave frequency, carrier frequency and output voltage closed loop etc. 3 or more join
Number, so that it may it is flexible to realize sine wave duty output, to realize that the input/output argument of inverter is adjustable, it is beneficial to improve
Adjust inverter efficiency.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of adjustable inverter control method of input/output argument, which comprises the following steps:
Chip receives input/output argument, and the input/output argument includes at least output sine wave freuqency, carrier frequency and defeated
Voltage close loop out；Wherein, 1024 sampled points are set by entire sine wave, the unit of the carrier frequency is KHz, and described
Carrier frequency is using 1024Hz as 1KHz；
According to the carrier frequency and the output sine wave freuqency, carrier cycle issue, the calculating of the carrier cycle issue are obtained
Formula are as follows:
According to the carrier cycle issue and the current carrier period position, physical location of tabling look-up, the actual bit of tabling look-up are obtained
The calculation formula set are as follows:
According to the physical location of tabling look-up, benchmark duty is searched in pre-set benchmark table；When the benchmark table is
When other degree tables other than 360 degree of tables, according to the physical location of tabling look-up, carrier wave quadrant, the carrier wave quadrant are obtained
(sin_TabLoop) calculation formula are as follows:
According to the carrier wave quadrant, benchmark duty is searched in pre-set benchmark table；Wherein, the benchmark table is at least
Including the benchmark duty and base position, and the benchmark table is on the basis of 90 degree of table, and to be set as 1024
Based on the sine wave of sampled point；
According to the benchmark duty and the output voltage closed loop, output duty is obtained；
The output duty is exported by the chip PWM.
2. the adjustable inverter control method of input/output argument as described in claim 1, which is characterized in that the master meter
Lattice are 90 degree of tables, described according to the carrier wave quadrant, and benchmark duty is searched in pre-set benchmark table, is specifically included
Following steps:
When the carrier wave quadrant integer is 0, benchmark duty is searched in the benchmark table by sort ascending；
When the carrier wave quadrant integer is 1, benchmark duty is searched in the benchmark table by sort descending；
When the carrier wave quadrant integer is 2, benchmark duty is searched in the benchmark table by sort ascending；
When the carrier wave quadrant integer is 3, benchmark duty is searched in the benchmark table by sort descending.
3. the adjustable inverter control method of input/output argument as claimed in claim 2, which is characterized in that the output
The calculation formula of duty is as follows:
Export duty=benchmark duty × feedback voltage ratio/256.
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| CN110138254B (en) | 2020-07-07 |
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