CN111130309B - Control method for improving sampling precision, storage medium and inverter power supply - Google Patents
Control method for improving sampling precision, storage medium and inverter power supply Download PDFInfo
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- CN111130309B CN111130309B CN201911397009.XA CN201911397009A CN111130309B CN 111130309 B CN111130309 B CN 111130309B CN 201911397009 A CN201911397009 A CN 201911397009A CN 111130309 B CN111130309 B CN 111130309B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
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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
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/0012—Control circuits using digital or numerical techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a control method for improving sampling precision, which is characterized in that a processing unit MCU is configured to control an analog-to-digital conversion unit ADC to trigger and complete analog-to-digital conversion within the turn-off dead time of PWM. According to the invention, the flexible triggering characteristic of the analog-to-digital conversion unit ADC in the processing unit MCU is utilized, the analog-to-digital conversion is triggered and completed within the time when the inversion PWM is in the turn-off dead zone, the turn-on or turn-off of the PWM cannot occur in the analog-to-digital conversion process, the influence of the PWM turn-on and turn-off noise on the sampling result is avoided, the dependence on hardware for eliminating the PWM turn-on and turn-off noise is reduced, the purpose of improving the analog quantity sampling precision is achieved, and the performance of the inversion power supply is improved.
Description
Technical Field
The invention relates to the technical field of inverter power supplies, in particular to a control method for improving sampling precision, a storage medium and an inverter power supply.
Background
In the sampling process of the existing inverter, when the current crosses zero, the current A/D (analog-to-digital) conversion is seriously influenced by zero drift and noise, so that the sampling precision is reduced. On one hand, the methods can increase the hardware cost, and the increase of filtering can also cause delay of sampling results, reduce the real-time performance of the system and cause the performance reduction of the power supply.
Chinese patent application publication No. CN108092532A discloses an inverter dead-zone compensation method based on PWM trigger voltage sampling, which includes the following steps: (1) configuring a PWM module, (2) configuring an ADC module, (3) reading a terminal voltage conversion value at the beginning of a switching period, reordering ADC channels and resetting a sequencer, (4) filtering a three-phase terminal voltage value obtained by sampling, (5) judging the polarity of three-phase current, (6) calculating compensation time, (7) substituting the polarity of the current and the compensation time into an expression to obtain three-phase compensation voltage, (8) performing Clarke conversion on the three-phase compensation voltage to obtain compensation voltage under a two-phase static coordinate system, and (9) adding the compensation voltage under the two-phase static coordinate system to target voltage under the two-phase static coordinate system to obtain compensated target voltage; (10) and taking the compensated target voltage as input, and executing a space vector pulse width modulation strategy to obtain the three-phase duty ratio of the next switching period.
The above prior art solutions have the following drawbacks: the current filtering has the defects of large phase delay, low real-time performance of the system, inaccurate current detection in the current zero-crossing interval and low power performance; the defect that the amplitude of the PWM on-off noise is reduced by adopting an improved hardware circuit is that the required hardware circuit is relatively complex, the cost is increased, the reliability is reduced, and the method is difficult to apply in practice; the inverter dead zone compensation method based on PWM trigger terminal voltage sampling has the defect that the dead zone can not be compensated, so that the PWM on-off noise can not be reduced, and the influence of the PWM on-off noise still exists.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a control method for improving sampling precision, a storage medium and an inverter power supply.
The above object of the present invention is achieved by the following technical solutions:
a control method for improving sampling precision is provided, which is characterized in that a processing unit MCU is configured to control an analog-to-digital conversion unit ADC to trigger and complete analog-to-digital conversion within the turn-off dead time of PWM.
By adopting the technical scheme, the flexible triggering characteristic of the analog-to-digital conversion unit ADC in the processing unit MCU is utilized, the analog-to-digital conversion is triggered and completed within the time when the inversion PWM is in the turn-off dead zone, the turn-on or turn-off of the PWM cannot occur in the analog-to-digital conversion process, the influence of the turn-on and turn-off noise of the PWM on the sampling result is avoided, the dependence on hardware for eliminating the turn-on and turn-off noise of the PWM is reduced, the purpose of improving the analog quantity sampling precision is achieved, and the performance of the inverter power supply is improved.
The present invention in a preferred example may be further configured to: the turn-off dead time of the PWM is the time period from the time T1 when the falling edge of the PWM1 pulse turns off to the time T4 when the rising edge of the PWM2 pulse comes.
By adopting the technical scheme, the turn-on or turn-off of the PWM can not occur in the turn-off dead time of the PWM, and the influence of the turn-on and turn-off noise of the PWM on the sampling result is avoided.
The invention in a preferred example may be further configured to: the configuration processing unit MCU specifically comprises: and configuring a timer of the processing unit MCU, and sending a driving signal to enable the analog-to-digital conversion unit ADC at the time T1 when the falling edge of the PWM1 pulse is turned off.
By adopting the technical scheme, the turn-on or turn-off of the PWM can not occur in the turn-off dead time of the PWM, and the influence of the turn-on and turn-off noise of the PWM on the sampling result is avoided.
The invention in a preferred example may be further configured to: the configuration processing unit MCU specifically comprises: and a timer of the processing unit MCU is configured, and a driving signal is sent to enable the analog-to-digital conversion unit ADC at the T1 moment when the falling edge of the PWM1 pulse is turned off and at the T2 moment after a preset time interval.
By adopting the technical scheme, the influence of noise generated at the moment of T1 when the falling edge of the PWM1 pulse is turned off on a sampling result is avoided.
The invention in a preferred example may be further configured to: the sum of twice the preset time and the analog-to-digital conversion time is less than the turn-off dead time.
By adopting the technical scheme, the influence of noise generated at the moment of T4 from the rising edge of the PWM2 pulse on the sampling result is avoided.
The invention in a preferred example may be further configured to: if the PWM is generated by software, the turn-off dead time can be modified by software.
By adopting the technical scheme, the performance of the inverter power supply can be influenced by changing the turn-off dead time, and the performance of the inverter power supply can not be adjusted at will generally, but can be modified through software if the time required by the analog-to-digital conversion is too long and the performance of the modified inverter power supply still meets the actual use standard.
The present invention in a preferred example may be further configured to: if the PWM is generated by hardware, the off dead time may be modified by hardware.
By adopting the technical scheme, the performance of the inverter power supply can be influenced by changing the turn-off dead time, and the performance of the inverter power supply can not be adjusted at will generally, but can be modified through hardware if the time required by the analog-to-digital conversion time is too long and the performance of the modified inverter power supply still meets the actual use standard.
The second aim of the invention is realized by the following technical scheme:
a storage medium storing a set of instructions adapted to be loaded by a processor and to perform the method of controlling sampling precision according to any one of claims 1 to 7.
By adopting the technical scheme, the flexible triggering characteristic of the analog-to-digital conversion unit ADC in the processing unit MCU is utilized, the analog-to-digital conversion is triggered and completed within the time when the inversion PWM is in the turn-off dead zone, the turn-on or turn-off of the PWM cannot occur in the analog-to-digital conversion process, the influence of the turn-on and turn-off noise of the PWM on the sampling result is avoided, the dependence on hardware for eliminating the turn-on and turn-off noise of the PWM is reduced, the purpose of improving the analog quantity sampling precision is achieved, and the performance of the inverter power supply is improved.
The third object of the invention is realized by the following technical scheme:
an inverter power supply comprising: the processing unit MCU is used for loading and executing the instruction set; and a storage medium as claimed in claim 8.
By adopting the technical scheme, the flexible triggering characteristic of the analog-to-digital conversion unit ADC in the processing unit MCU is utilized, the analog-to-digital conversion is triggered and completed within the time when the inversion PWM is in the turn-off dead zone, the turn-on or turn-off of the PWM cannot occur in the analog-to-digital conversion process, the influence of the turn-on and turn-off noise of the PWM on the sampling result is avoided, the dependence on hardware for eliminating the turn-on and turn-off noise of the PWM is reduced, the purpose of improving the analog quantity sampling precision is achieved, and the performance of the inverter power supply is improved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the flexible triggering characteristic of an analog-to-digital conversion unit ADC in the processing unit MCU is utilized, the analog-to-digital conversion is triggered and completed within the time when the inversion PWM is in a turn-off dead zone, the turn-on or turn-off of the PWM cannot occur in the analog-to-digital conversion process, and the influence of PWM turn-on and turn-off noise on a sampling result is avoided;
2. the dependence on hardware for eliminating PWM switching-on and switching-off noise is reduced, so that the purpose of improving the analog quantity sampling precision is achieved, and the performance of the inverter power supply is improved;
3. the current does not need to be filtered, the phase delay is not caused, and the real-time performance of the system is high.
Drawings
FIG. 1 is a schematic diagram of a full-bridge main circuit topology of an inverter power supply;
FIG. 2 is a schematic diagram of a main circuit topology of a half-bridge of the inverter power supply;
fig. 3 is a schematic diagram of the control method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a control method for improving sampling precision, which is characterized in that a processing unit MCU is configured to control an analog-to-digital conversion unit ADC to trigger and complete analog-to-digital conversion within the turn-off dead time of PWM (pulse width modulation).
Referring to fig. 1 and fig. 2, energy transfer is realized by alternately switching on and off PWM1 and PWM2, and in order to ensure the safety of a power tube, sufficient turn-off dead time for simultaneous turn-off is required to be left for switching on and off PWM1 and PWM 2; the turn-off dead time of the PWM is the time period from the time T1 when the falling edge of the PWM1 pulse turns off to the time T4 when the rising edge of the PWM2 pulse comes.
The configuration processing unit MCU specifically comprises: and a timer of the processing unit MCU is configured, and at the T1 moment when the falling edge of the PWM1 pulse is turned off, a driving signal is sent out to enable the analog-to-digital conversion unit ADC.
The configuration processing unit MCU specifically comprises: a timer of the processing unit MCU is configured, and a driving signal is sent to enable the analog-to-digital conversion unit ADC at the T1 moment when the pulse of the PWM1 is turned off at intervals of the T2 moment after the preset time; the sum of the two times of the preset time and the analog-to-digital conversion time is smaller than the turn-off dead time, and the analog-to-digital conversion time is the time required by the analog-to-digital conversion unit ADC to complete analog-to-digital conversion.
Referring to FIG. 3, a) PWM1 (T0-T1) and b) PWM2 (T4-T5) are pulses for controlling the on-off of a main power device of the inverter power supply, and the on-off of the main power device at the time of T1 or T4 can cause c) noise generated on the analog quantity signal; in order to avoid the influence of on-off noise of a main power device on a sampling result, a timer of a processing unit MCU is configured, a driving signal is sent out at d) T2 moment of a PWM (pulse-width modulation) turn-off dead zone to enable an analog-to-digital conversion unit ADC, and e) analog-to-digital conversion is completed in T2-T3.
The inverter power supply T2 with different powers and driving hardware has different time, and different timer characteristics and analog-to-digital converter characteristics inside the MCU have different ways of starting the analog-to-digital converter, and the difference in the characteristics of the analog-to-digital converter mainly refers to the difference in the conversion completion time.
For example: the power supply of the 20KW inverter welding machine has the switching frequency of 20KHz and the turn-off dead time T1-T4: 3 us; the analog-to-digital conversion time T2-T3: 1.5us, and the preset time is less than or equal to (3-1.5)/2 =0.75 us.
Another example is: the switching frequency of the 5KW half-bridge inverter power supply is 50KHz, the turn-off dead time is T1-T4: 2.5us, the analog-to-digital conversion time is T2-T3: 1us, and the preset time is less than or equal to (2.5-1)/2 =0.75 us.
For another example: the power supply of the 50kw full-bridge inverter welding machine has the switching frequency of 20KHz and the turn-off dead time T1-T4: 5us, analog-to-digital conversion time T2-T3: 2us, and the preset time is less than or equal to (5-2)/2 =1.5 us.
The dead time for turning off is set for ensuring the safety of a power device, the performance of the inverter power supply can be influenced by changing the dead time for turning off, the performance of the inverter power supply can not be adjusted randomly generally, however, if the time required by analog-to-digital conversion is too long and the performance of the inverter power supply after modification still can meet the actual use standard, and if the PWM is generated by software, the dead time for turning off can be modified by the software; if the PWM is generated by hardware, the turn-off dead time can be modified by hardware.
The invention also discloses a storage medium, which stores an instruction set, wherein the instruction set is suitable for a processor to load and execute the control method for improving the sampling precision.
The invention also discloses an inverter power supply, comprising: the processing unit MCU is used for loading and executing the instruction set; and, the storage medium.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A control method for improving sampling precision is characterized in that: the processing unit MCU is configured to control the analog-to-digital conversion unit ADC to trigger and complete analog-to-digital conversion within the turn-off dead time of the PWM; the turn-off dead time of the PWM is the time period from the T1 moment when the PWM1 pulse falls off to the T4 moment when the PWM2 pulse rises; the configuration processing unit MCU specifically comprises: a timer of the processing unit MCU is configured, and a driving signal is sent to enable the analog-to-digital conversion unit ADC at the T1 moment when the pulse of the PWM1 is turned off at intervals of the T2 moment after the preset time; the sum of twice the preset time and the analog-to-digital conversion time is less than the turn-off dead time, and the analog-to-digital conversion time is the time required by the analog-to-digital conversion unit ADC to complete the analog-to-digital conversion.
2. The control method for improving the sampling precision according to claim 1, wherein the configuration processing unit MCU specifically is: and a timer of the processing unit MCU is configured, and at the T1 moment when the falling edge of the PWM1 pulse is turned off, a driving signal is sent out to enable the analog-to-digital conversion unit ADC.
3. The control method for improving the sampling precision according to claim 1, characterized in that: the sum of the two times of the preset time and the analog-to-digital conversion time is less than the turn-off dead time.
4. The control method for improving the sampling precision according to claim 1, characterized in that: if the PWM is generated by software, the turn-off dead time can be modified by software.
5. The control method for improving the sampling precision according to claim 1, characterized in that: if the PWM is generated by hardware, the off dead time may be modified by hardware.
6. A storage medium, characterized by: which stores an instruction set adapted to be loaded by a processor and to execute the method of controlling the sampling precision improvement according to any one of claims 1-5.
7. An inverter power supply, comprising: the processing unit MCU is used for loading and executing the instruction set; and a storage medium as claimed in claim 6.
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| CN118508822B (en) * | 2024-07-16 | 2024-11-05 | 苏州铼钠克信息技术有限公司 | Current sampling method and related device for servo driver current hysteresis control |
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| CN100511966C (en) * | 2003-03-19 | 2009-07-08 | 日立空调系统株式会社 | AC motor control device |
| CN102315765A (en) * | 2010-07-05 | 2012-01-11 | 北京动力源科技股份有限公司 | New current sampling method for PFC (power factor correction) circuit |
| JP2012139084A (en) * | 2010-12-10 | 2012-07-19 | Toyota Motor Corp | Step-up converter control device |
| CN103684031A (en) * | 2013-12-03 | 2014-03-26 | 苏州景新电气有限公司 | Current hysteresis control digital implementation system for PWM rectifier |
| CN107688117A (en) * | 2017-08-30 | 2018-02-13 | 汪明生 | A kind of two-phase stepping motor driver feedback current method of sampling |
| CN110361588A (en) * | 2019-08-08 | 2019-10-22 | 浙江工业大学 | Current detection method for permanent magnet synchronous motor in automobile electric compressor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102332815A (en) * | 2011-09-14 | 2012-01-25 | 深圳航天科技创新研究院 | A method and circuit for suppressing analog-to-digital conversion noise |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100511966C (en) * | 2003-03-19 | 2009-07-08 | 日立空调系统株式会社 | AC motor control device |
| CN102315765A (en) * | 2010-07-05 | 2012-01-11 | 北京动力源科技股份有限公司 | New current sampling method for PFC (power factor correction) circuit |
| JP2012139084A (en) * | 2010-12-10 | 2012-07-19 | Toyota Motor Corp | Step-up converter control device |
| CN103684031A (en) * | 2013-12-03 | 2014-03-26 | 苏州景新电气有限公司 | Current hysteresis control digital implementation system for PWM rectifier |
| CN107688117A (en) * | 2017-08-30 | 2018-02-13 | 汪明生 | A kind of two-phase stepping motor driver feedback current method of sampling |
| CN110361588A (en) * | 2019-08-08 | 2019-10-22 | 浙江工业大学 | Current detection method for permanent magnet synchronous motor in automobile electric compressor |
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