CN112018779B - Charging pile test power supply compensation method and system - Google Patents
Charging pile test power supply compensation method and system Download PDFInfo
- Publication number
- CN112018779B CN112018779B CN202010996553.2A CN202010996553A CN112018779B CN 112018779 B CN112018779 B CN 112018779B CN 202010996553 A CN202010996553 A CN 202010996553A CN 112018779 B CN112018779 B CN 112018779B
- Authority
- CN
- China
- Prior art keywords
- voltage
- compensation
- power supply
- value
- voltage value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 54
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 230000002093 peripheral effect Effects 0.000 claims abstract description 18
- 230000001360 synchronised effect Effects 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 12
- 238000007667 floating Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000010752 BS 2869 Class D Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241001505100 Succisa pratensis Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a charging pile test power supply compensation method and system, which are applied to a charging pile test power supply compensation system and comprise the following steps: receiving a target voltage value input by a user through the peripheral keyboard; acquiring real-time voltage values respectively corresponding to the initial voltages of the voltage compensation modules through the AD conversion module; when the real-time voltage value is inconsistent with the target voltage value, generating a compensation signal through the central processing module based on the difference value between the target voltage value and the real-time voltage value, and sending the compensation signal to the voltage compensation module; and performing voltage compensation on the basis of the compensation signal through the voltage compensation module, generating a target voltage corresponding to the target voltage value and outputting the target voltage through the output end of the test power supply. Therefore, the output of the test power supply is effectively compensated, the output accuracy of the test power supply is improved, and the adjustment cost is reduced.
Description
Technical Field
The invention relates to the technical field of power supply compensation, in particular to a charging pile test power supply compensation method and system.
Background
Electric vehicles, as a prominent representative of new energy development, have become an important development direction to replace traditional power vehicles and lead new era in the automotive industry. At present, the world automobile industry is actively invested in the development and popularization process of electric automobiles, and governments and enterprises of various countries invest a great deal of manpower, material resources and financial resources in the field of electric automobiles. Under the guidance of a three-vertical and three-horizontal research and development layout policy in China, the electric vehicle industry is developed very quickly.
The three-phase alternating-current variable-frequency power supplies are widely used in charging piles in the current market, the three-phase alternating-current variable-frequency power supplies need to rectify the voltage of a three-phase power grid into direct current and then invert the variable-frequency output of three-phase sine waves into three-phase alternating-current signals through an SPWM (Sinusoidal Pulse Width Modulation) variable-frequency control technology, and the existing power supply equipment generally needs full-power load output, so that the load of the power supply equipment is large, and the cost is high.
Disclosure of Invention
The invention provides a charging pile test power supply compensation method and system, and solves the technical problems that the conventional power supply equipment generally needs full-power load output, the load on the power supply equipment is large, and the cost is high.
The invention provides a charging pile test power supply compensation method which is applied to a charging pile test power supply compensation system, wherein the charging pile test power supply compensation system comprises a power grid access end, a test power supply output end, an external keyboard, an AD conversion module, a central processing module and a plurality of voltage compensation modules, and the method comprises the following steps:
receiving a target voltage value input by a user through the peripheral keyboard;
acquiring real-time voltage values respectively corresponding to the initial voltages of the voltage compensation modules through the AD conversion module; the initial voltage is input from a preset power grid through the power grid access end;
when the real-time voltage value is inconsistent with the target voltage value, generating a compensation signal through the central processing module based on the difference value between the target voltage value and the real-time voltage value, and sending the compensation signal to the voltage compensation module;
and performing voltage compensation on the basis of the compensation signal through the voltage compensation module, generating a target voltage corresponding to the target voltage value and outputting the target voltage through the output end of the test power supply.
Optionally, the step of acquiring, by the AD conversion module, real-time voltage values corresponding to the initial voltages of the plurality of voltage compensation modules respectively includes:
respectively collecting initial voltages corresponding to the plurality of voltage compensation modules through the AD conversion module;
detecting an initial voltage value of the initial voltage by the AD conversion module;
and converting the initial voltage value into a floating point number form as a real-time voltage value through the AD conversion module.
Optionally, when the real-time voltage value is inconsistent with the target voltage value, the step of generating, by the central processing module, a compensation signal based on a difference between the target voltage value and the real-time voltage value and sending the compensation signal to the voltage compensation module includes:
when the real-time voltage value is inconsistent with the target voltage value, calculating a difference value between the target voltage value and the real-time voltage value through the central processing module;
calculating a multiplication value of the difference value and a preset parameter through the central processing module;
acquiring a historical voltage value of the voltage compensation module at the last moment through the central processing module;
calculating the sum of the multiplied value and the historical voltage value as a compensation signal through the central processing module;
sending, by the central processing module, the compensation signal to the voltage compensation module.
Optionally, the voltage compensation module includes a power amplifier switching power supply, a switching power amplifier, and a digital synchronous tracking amplifier, and the voltage compensation module performs voltage compensation based on the compensation signal to generate a target voltage corresponding to the target voltage value and output the target voltage through the output end of the test power supply, including:
acquiring a predetermined voltage through the digital synchronous tracking amplifier;
determining a voltage to be amplified by the digital synchronous tracking amplifier by adopting the preset voltage and the compensation signal and transmitting the voltage to the switching power amplifier;
amplifying the voltage to be amplified through the switching power amplifier to generate a target voltage corresponding to the target voltage value; the power amplifier switch power supply is used for providing the initial voltage for the switch power amplifier;
and outputting the target voltage through the output end of the test power supply.
Optionally, the method further comprises:
and when a termination instruction input by a user is received through the peripheral keyboard, stopping the output of the target voltage.
The invention also provides a charging pile test power supply compensation system which comprises a power grid access end, a test power supply output end, an external keyboard, an AD conversion module, a central processing module and a plurality of voltage compensation modules;
the input end of the power grid access end is connected with a preset power grid, and the output end of the power grid access end is respectively connected with the voltage input ends of the plurality of voltage compensation modules and is used for receiving initial voltage output by the preset power grid and respectively transmitting the initial voltage to the voltage input ends of the plurality of power grid compensation modules;
the input end of the AD conversion module is respectively connected with the voltage output ends of the power grid compensation modules and is used for collecting real-time voltage values of the power grid compensation modules;
the output end of the AD conversion module is connected with the first input end of the central processing module and is used for transmitting the real-time voltage value to the central processing module;
the second input end of the central processing module is connected with the peripheral keyboard and used for receiving a target voltage value input through the peripheral keyboard;
the first output end of the central processing module is connected with the voltage compensation ends of the voltage compensation modules and used for generating a compensation signal according to the difference value between the target voltage value and the real-time voltage value and sending the compensation signal to the voltage compensation module;
the voltage output ends of the plurality of voltage compensation modules are also respectively connected with the output end of the test power supply, and are used for performing voltage compensation according to the compensation signal and outputting a target voltage corresponding to the target voltage value to the output end of the test power supply;
and the test power supply output end is used for outputting the target voltage.
Optionally, the voltage compensation module includes a power amplifier switching power supply, a switching power amplifier, and a digital synchronous tracking amplifier;
the input end of the power amplifier switch power supply is connected with the output end of the power grid access end, and the output end of the power amplifier switch power supply is connected with the power supply end of the switch power amplifier and used for providing the initial voltage as the power supply of the switch power amplifier;
the voltage input end of the digital synchronous tracking amplifier is connected with the output end of the power grid access end, the voltage compensation end of the digital synchronous tracking amplifier is connected with the first output end of the central processing unit, and the voltage output end to be amplified of the digital synchronous tracking amplifier is connected with the input end of the switching power amplifier and used for generating voltage to be amplified according to the initial voltage and the compensation signal and transmitting the voltage to be amplified to the switching power amplifier;
and the output end of the switching power amplifier is connected with the output end of the test power supply and used for amplifying the voltage to be amplified, generating a target voltage corresponding to the target voltage value and transmitting the target voltage to the output end of the test power supply.
Optionally, the system further comprises a display screen, and the display screen is connected with the second output end of the central processing module.
Optionally, the digital synchronous tracking amplifier comprises a first voltage transformer, a DA converter and an operational amplifier group;
a primary winding of the first voltage transformer is connected with an output end of the power grid access end, and a secondary winding of the first voltage transformer is connected with a first input end of the DA converter and used for receiving the initial voltage and transmitting the initial voltage to the DA converter;
and the second input end of the DA converter is connected with the first output end of the central processing unit, and the output end of the DA converter is connected with the inverting input end of the operational amplifier group and used for generating the voltage to be amplified according to the initial voltage and the compensation signal.
Optionally, the AD conversion module includes an AD converter, a reference power supply, and a plurality of second voltage transformers;
a primary winding of each second voltage transformer is connected with a voltage output end of one power grid compensation module, and a secondary winding of each second voltage transformer is connected with an input end of the AD converter;
and the reference voltage end of the AD converter is connected with the reference power supply, and the reference power supply is used for providing a reference voltage value.
According to the technical scheme, the invention has the following advantages:
in the embodiment of the invention, a target voltage value is input through a peripheral keyboard, and a real-time voltage value of the voltage compensation module at the current moment is detected in real time through an AD conversion module; and when the real-time voltage value is inconsistent with the target voltage value, generating a compensation signal based on the difference value of the target voltage value and the real-time voltage value through the central processing module, sending the compensation signal to the voltage compensation module, finally executing voltage compensation based on the compensation signal through the voltage compensation module to generate a target voltage equal to the target voltage value, and outputting the target voltage through the test power supply output end. Therefore, the technical problems that the conventional power supply equipment generally needs full-power load output, the load of the power supply equipment is large, and the cost is high are solved, the test power supply output is effectively compensated, the precision of the test power supply output is improved, and the adjustment cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a charging pile test power compensation method according to an embodiment of the present invention;
fig. 2 is a block diagram of a charging pile test power compensation system according to an embodiment of the present invention;
fig. 3 is a block diagram of a power amplifier switching power supply according to an embodiment of the present invention;
fig. 4 is a block diagram of a switching power amplifier according to an embodiment of the present invention;
fig. 5 is a block diagram of a digital synchronous tracking amplifying module according to an embodiment of the present invention;
Detailed Description
The embodiment of the invention provides a charging pile test power supply compensation method and system, which are used for solving the technical problems that the conventional power supply equipment generally needs full-power load output, the load on the power supply equipment is large and the cost is high.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a charging pile test power compensation method according to an embodiment of the present invention.
The invention provides a charging pile test power supply compensation method which is applied to a charging pile test power supply compensation system, wherein the charging pile test power supply compensation system comprises a power grid access end, a test power supply output end, an external keyboard, an AD conversion module, a central processing module and a plurality of voltage compensation modules, and the method comprises the following steps of 101 and 104:
in the embodiment of the present invention, in order to verify the safety and the validity of the testing power supply of the charging pile, the testing power supply needs to perform tests under various voltages, such as an overvoltage protection test, an undervoltage protection test, a normal voltage operation test, and the like, at this time, a target voltage value input by a user may be received through an external keyboard, for example, the general operating voltage of the testing power supply is 220V, when the overvoltage protection test is input, 220 × 1.15 — 253V may be set, and when the undervoltage protection test is input, 220 × 0.85 — 187V may be set.
in the embodiment of the invention, the initial voltage is a voltage input from a preset power grid through the power grid access end, and in order to compensate the voltage of the system in real time, the voltage value at the current moment needs to be detected in real time, so that the real-time voltage value corresponding to the initial voltage can be detected through the AD conversion module, and the voltage value at the current moment can be known, so that the voltage compensation can be performed subsequently.
Optionally, the step 102 comprises the sub-steps of:
respectively collecting initial voltages corresponding to the plurality of voltage compensation modules through the AD conversion module;
detecting an initial voltage value of the initial voltage by the AD conversion module;
and converting the initial voltage value into a floating point number form as a real-time voltage value through the AD conversion module.
In an embodiment of the invention, the AD conversion module may convert the initial voltage into a decimal voltage through the transformer, so as to achieve the purpose of collecting the initial voltages corresponding to the plurality of voltage compensation modules, and then, by detecting the initial voltage value of the initial voltage, the initial voltage value may be converted into a floating point number form to serve as a real-time voltage value for facilitating subsequent calculation.
Optionally, the AD conversion module may adopt a 24-bit AD conversion module, and at this time, the initial voltage value is multiplied by a preset proportion and converted into a floating point number form as a real-time voltage value.
103, when the real-time voltage value is inconsistent with the target voltage value, generating a compensation signal by the central processing module based on a difference value between the target voltage value and the real-time voltage value, and sending the compensation signal to the voltage compensation module;
in a specific implementation, when the real-time voltage value is inconsistent with the target voltage value, it is indicated that voltage compensation needs to be performed at this time, a difference value between the target voltage value and the real-time voltage value can be calculated through the central processing module, a compensation signal is generated based on the difference value and is sent to the voltage compensation module, and therefore the voltage compensation module is enabled to perform voltage compensation.
Further, the step 103 comprises the following sub-steps:
when the real-time voltage value is inconsistent with the target voltage value, calculating a difference value between the target voltage value and the real-time voltage value through the central processing module;
calculating a multiplication value of the difference value and a preset parameter through the central processing module;
acquiring a historical voltage value of the voltage compensation module at the last moment through the central processing module;
calculating the sum of the multiplied value and the historical voltage value as a compensation signal through the central processing module;
sending, by the central processing module, the compensation signal to the voltage compensation module.
In a specific implementation, when the real-time voltage value is inconsistent with the target voltage value, it is indicated that voltage compensation needs to be performed at this time, a signed number needs to be calculated according to a multiplication value calculated by the voltage difference value and a preset parameter as the voltage may need to be increased or decreased, and the voltage value compensated at this time is obtained based on the sum of the multiplication value and the historical voltage value of the voltage compensation module at the previous time, and is used as a compensation signal, and the compensation signal is sent to the voltage compensation module.
It should be mentioned that the preset parameter K may be 100, or may be valued by a person skilled in the art according to actual conditions, and when the value of K is large, the adjustment speed is fast, but overshoot is easy, and the output stability is reduced. When the value of K is 100, the time of the calculation window is defined as 100ms, if the differential pressure is the maximum value of 33V, 33 × 100 is 3300, the output maximum value is 32768, approximately 10 cycles are needed to be controlled to be close to the set value, and the time of 10 cycles is 100ms × 10 is 1 second, so that the requirement of the regulation speed can be met.
If the differential pressure is small, such as 0.5V, the rapid adjustment can be realized within 100mS, the stability of the source output is ensured, and the K value is taken as 100, so that the rapid adjustment and the stability are both considered.
And 104, performing voltage compensation on the basis of the compensation signal through the voltage compensation module, generating a target voltage corresponding to the target voltage value, and outputting the target voltage through the output end of the test power supply.
In an optional embodiment of the present invention, after the voltage compensation module receives the compensation signal, voltage compensation may be performed based on the compensation signal to generate a target voltage corresponding to the target voltage value and output the target voltage through the test power output terminal.
In another example of the present invention, the voltage compensation module includes a power amplifier switching power supply, a switching power amplifier and a digital synchronous tracking amplifier, and the step 104 may include the following substeps S1-S4:
a substep S1 of obtaining a predetermined voltage through the digital synchronous tracking amplifier;
a substep S2, determining a voltage to be amplified by the digital synchronous tracking amplifier using the predetermined voltage and the compensation signal, and transmitting the voltage to the switching power amplifier;
in the embodiment of the invention, a preset voltage is obtained by a digital synchronous tracking amplifier and is used as an input of a compensation voltage, the preset voltage and a compensation signal are adopted, a preset formula is matched to calculate to-be-amplified voltage, and the to-be-amplified voltage is transmitted to a switching power amplifier, wherein the preset formula can be as follows:
Vs＝(Di/32768-1)*Vin
wherein, VsFor the voltage to be amplified, DiTo compensate for the signal, VinIs the predetermined voltage.
Optionally, the VinIt may be a default of 2.75V with a peak-to-peak value of 3.89V.
A substep S3, amplifying the voltage to be amplified by the switching power amplifier, and generating a target voltage corresponding to the target voltage value;
and a substep S4 of outputting the target voltage through the test power supply output terminal.
In the embodiment of the invention, the voltage to be amplified is amplified through the switching power amplifier to generate the target voltage corresponding to the target voltage value, the power amplifier switching power supply is used for providing the initial voltage for the switching power amplifier, the initial voltage and the voltage to be amplified are received through the switching power amplifier to be amplified to generate the target voltage, and finally the target voltage is output through the output end of the test power supply.
Optionally, the method may further comprise the steps of:
and when a termination instruction input by a user is received through the peripheral keyboard, stopping the output of the target voltage.
In the embodiment of the invention, a target voltage value is input through a peripheral keyboard, and a real-time voltage value of the voltage compensation module at the current moment is detected in real time through an AD conversion module; and when the real-time voltage value is inconsistent with the target voltage value, generating a compensation signal based on the difference value of the target voltage value and the real-time voltage value through the central processing module, sending the compensation signal to the voltage compensation module, finally executing voltage compensation based on the compensation signal through the voltage compensation module to generate a target voltage equal to the target voltage value, and outputting the target voltage through the test power supply output end. Therefore, the technical problems that the conventional power supply equipment generally needs full-power load output, the load of the power supply equipment is large, and the cost is high are solved, the test power supply output is effectively compensated, the precision of the test power supply output is improved, and the adjustment cost is reduced.
Referring to fig. 2, fig. 2 is a block diagram illustrating a charging pile test power compensation system according to an embodiment of the present invention.
A charging pile test power supply compensation system comprises a power grid access end 1, a test power supply output end 2, an external keyboard 10, an AD conversion module 7, a central processing module 8 and a plurality of voltage compensation modules;
the input end of the power grid access end 1 is connected with a preset power grid, and the output end of the power grid access end 1 is respectively connected with the voltage input ends of the plurality of voltage compensation modules, and is used for receiving initial voltage output by the preset power grid and respectively transmitting the initial voltage to the voltage input ends of the plurality of power grid compensation modules;
the input end of the AD conversion module 7 is respectively connected with the voltage output ends of the power grid compensation modules and is used for acquiring real-time voltage values of the power grid compensation modules;
the output end of the AD conversion module 7 is connected to the first input end of the central processing module 8, and is configured to transmit the real-time voltage value to the central processing module 8;
a second input end of the central processing module 8 is connected with the peripheral keyboard 10, and is used for receiving a target voltage value input through the peripheral keyboard 10;
the first output end of the central processing module 8 is connected to the voltage compensation ends of the voltage compensation modules, and is configured to generate a compensation signal according to a difference between the target voltage value and the real-time voltage value, and send the compensation signal to the voltage compensation module;
the voltage output ends of the plurality of voltage compensation modules are also respectively connected with the test power supply output end 2 and used for performing voltage compensation according to the compensation signal and outputting a target voltage corresponding to the target voltage value to the test power supply output end 2;
and the test power supply output end 2 is used for outputting the target voltage.
It is worth mentioning that the power grid access end 1 is an alternating current power supply socket which can be connected to a socket of a three-phase power grid; the test power output terminal 2 is an alternating current power supply socket,
the central processing module 8 may adopt a BF609 chip, and a large number of peripheral devices are built in the chip, including 2 SPI interfaces, 3 port ports, 16 general IO ports, AMC interfaces (asynchronous storage interface), and the like, 256MBYTE DRAM, and a core algorithm, task scheduling, displaying, inputting, and the like for completing the present invention.
The AD conversion module 7 may adopt a 24BIT strictly synchronous 8-channel sigma-delta AD converter ADs1278, and the typical value of the integral error is: ± 0.0003% and a maximum sampling rate of 128 KSPS.
The peripheral keyboard 10 is a simple keyboard, and 6 keyboards in total are connected to 6 IO ports of the BF609 chip.
Optionally, the voltage compensation module includes a power amplifier switching power supply, a switching power amplifier, and a digital synchronous tracking amplifier;
the input end of the power amplifier switch power supply is connected with the output end of the power grid access end 1, and the output end of the power amplifier switch power supply is connected with the power supply end of the switch power amplifier and used for providing the initial voltage as the power supply of the switch power amplifier;
the voltage input end of the digital synchronous tracking amplifier is connected with the output end of the power grid access end 1, the voltage compensation end of the digital synchronous tracking amplifier is connected with the first output end of the central processing unit, and the voltage output end to be amplified of the digital synchronous tracking amplifier is connected with the input end of the switching power amplifier and used for generating a voltage to be amplified according to the initial voltage and the compensation signal and transmitting the voltage to be amplified to the switching power amplifier;
the output end of the switching power amplifier is connected with the output end 2 of the test power supply, and is used for amplifying the voltage to be amplified, generating a target voltage corresponding to the target voltage value and transmitting the target voltage to the output end 2 of the test power supply.
In specific implementation, the voltage compensation module comprises a power amplifier switch power supply 3a/3b/3c, a switch power amplifier 4a/4b/4c and a digital synchronous tracking amplifier 5a/5b/5 c.
The power amplifier switch power supply 3a/3b/3c is a customized switch power supply, as shown in fig. 3, and is used for supplying power to the switch power amplifier 4a/4b/4c, and can also be used in parallel with independent switch power supplies in markets with various specifications. PVDD, the output voltage is 68V, the maximum current is 200A, and the PVDD is used for directly driving a power supply for a switching power amplifier; VDD is a chip working power supply, the output voltage is 12V, and the maximum current is 5A; DVDD is a digital logic power supply, the output voltage is 3.3V, and the maximum current is 5A; AVDD is an analog power supply, the output voltage is 7V, and the maximum current is 5A.
The switching power amplifiers 4a/4b/4c are shown in fig. 4, and are mainly used for converting small signal voltage into power amplification output of large current, 20 class-D power amplifiers are connected in parallel for output, one class-D power amplifier can provide 10A current and 44V voltage output at maximum, and the maximum input value of the power amplifier is +/-3.9V. The switching power amplifier can be a class-D power amplifier and mainly comprises TI TPA3255, filter inductors 301a and 301b, other capacitors with withstand voltage of 80V and resistors with accuracy of 1%. A core device of the power amplifier is a class D power amplifier TPA3255 of TI company, PBTL configuration is adopted, two channels of 315W are combined into an output channel of 600W, 44V alternating voltage can be output to the maximum, the maximum input value is +/-3.9V, and the efficiency can reach about 90%. The current of the filter inductors 301a, 301b is 20A. The other capacitors and resistors are conventional capacitors (withstand voltage of 80V) and resistors.
As shown in fig. 5, the digital synchronous tracking amplifier 5a/5b/5c is a unipolar-to-bipolar output circuit formed by a voltage transformer 501, a DA conversion module 502(AD5545), an AD8620 operational amplifier 503, an AD8620 operational amplifier 504, and resistors R1, R2, R3, and R4. The transformation ratio of the voltage transformer 501 is 220:2.75, namely 220V voltage input, and 2.75V voltage output is output; the D8620 operational amplifier 503, the AD8620504 and the resistors R1, R2, R3 and R4 form a unipolar-to-bipolar output circuit. That is, an inverted output can be realized, and if the grid voltage is 220V, the output is set to 200V, which is that a voltage output of-20V can be realized through the unipolar-to-bipolar circuit.
The DA conversion module 502 receives the setting value D from the central processing module through the SPORT interfacei。
Vs＝(Di/32768-1)*Vin
VinThe default of the secondary output value of the voltage transformer 501 is 2.75V, and the peak-to-peak value is 3.89V; diAn unsigned value of 16 bits is 0-65535;
when D is presentiWhen the value of (A) is less than 32768, VsPhase sum V ofinThe phases of the power amplifier are opposite, and the purpose of reducing the voltage of the power grid through the switching power amplifier can be achieved.
When D is presentiWhen the value of (A) is greater than 32768, VsPhase ofBit sum VinThe phases of the power amplifier are the same, and the purpose of increasing the voltage of the power grid through the switching power amplifier can be achieved.
Optionally, the system further comprises a display screen 9, and the display screen 9 is connected with the second output end of the central processing module 8.
It should be noted that the display screen 9 is a liquid crystal display module, and is directly driven by a BF609 chip through an AMC interface for display.
Optionally, the digital synchronous tracking amplifier comprises a first voltage transformer, a DA converter and an operational amplifier group;
a primary winding of the first voltage transformer is connected with an output end of the power grid access end 1, and a secondary winding of the first voltage transformer is connected with a first input end of the DA converter and used for receiving the initial voltage and transmitting the initial voltage to the DA converter;
and the second input end of the DA converter is connected with the first output end of the central processing unit, and the output end of the DA converter is connected with the inverting input end of the operational amplifier group and used for generating the voltage to be amplified according to the initial voltage and the compensation signal.
Optionally, the AD conversion module 7 includes an AD converter, a reference power supply 13 and a plurality of second voltage transformers;
a primary winding of each second voltage transformer is connected with a voltage output end of one power grid compensation module, and a secondary winding of each second voltage transformer is connected with an input end of the AD converter;
the reference voltage terminal of the AD converter is connected to the reference power supply 13, and the reference power supply 13 is configured to provide a reference voltage value.
In the specific implementation, the voltage transformers 6a, 6b and 6c adopt 0.02-level voltage transformers, the transformation ratio of the voltage transformers is 220:1, namely, 220V voltage input, 1V secondary output and 5mA load capacity; the power converter 11 is a 5-to-3.3V linear voltage stabilizing module, converts a 5V power supply into 3.3V for BF609 and AD converters, and converts the 3.3V power supply by using a chip REG1117F-3.3 with fixed voltage output. The power converter 12 is a linear voltage stabilizing module with 5-to-1.8V, converts a 5V power supply into 1.8V for BF609 and AD converters, and converts the 5V power supply into 1.8V power supply by using a chip REG1117F-1.8 with fixed voltage output; the reference power 1313 outputs a voltage value of 2.5V from the chip ADR441B, and the temperature drift is better than 3 ppm.
In the embodiment of the invention, three-phase alternating voltage signals are reduced by 220 times through the voltage transformers 6a, 6b and 6c and then input to three channels of the AD conversion module 77, the central processing module 88 controls the AD conversion module 77 to continuously acquire voltage waveform values at the sampling rate of 12.8KSPS, the voltage amplitude is calculated and compared with a set value, the difference value is output to the digital synchronous tracking amplifier 5 through a SPORT 1\2\3 port, and the output of the switching power amplifier 4 is controlled to be consistent with the set value.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the system described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The charging pile test power supply compensation method is applied to a charging pile test power supply compensation system, the charging pile test power supply compensation system comprises a power grid access end, a test power supply output end, a peripheral keyboard, an AD conversion module, a central processing module and a plurality of voltage compensation modules, and the method comprises the following steps:
receiving a target voltage value input by a user through the peripheral keyboard;
acquiring real-time voltage values respectively corresponding to the initial voltages of the voltage compensation modules through the AD conversion module; the initial voltage is input from a preset power grid through the power grid access end;
when the real-time voltage value is inconsistent with the target voltage value, generating a compensation signal through the central processing module based on the difference value between the target voltage value and the real-time voltage value, and sending the compensation signal to the voltage compensation module;
performing voltage compensation based on the compensation signal through the voltage compensation module to generate a target voltage corresponding to the target voltage value and output the target voltage through the output end of the test power supply;
the voltage compensation module comprises a power amplifier switch power supply, a switch power amplifier and a digital synchronous tracking amplifier, the voltage compensation module performs voltage compensation based on the compensation signal, generates a target voltage corresponding to the target voltage value and outputs the target voltage through the output end of the test power supply, and the voltage compensation module comprises:
acquiring a predetermined voltage through the digital synchronous tracking amplifier;
determining a voltage to be amplified by the digital synchronous tracking amplifier by adopting the preset voltage and the compensation signal and transmitting the voltage to the switching power amplifier;
amplifying the voltage to be amplified through the switching power amplifier to generate a target voltage corresponding to the target voltage value; the power amplifier switch power supply is used for providing the initial voltage for the switch power amplifier;
and outputting the target voltage through the output end of the test power supply.
2. The method according to claim 1, wherein the step of acquiring, by the AD conversion module, real-time voltage values corresponding to the initial voltages of the plurality of voltage compensation modules, respectively, comprises:
respectively collecting initial voltages corresponding to the plurality of voltage compensation modules through the AD conversion module;
detecting an initial voltage value of the initial voltage by the AD conversion module;
and converting the initial voltage value into a floating point number form as a real-time voltage value through the AD conversion module.
3. The method of claim 1, wherein the step of generating and sending a compensation signal to the voltage compensation module by the central processing module based on the difference between the target voltage value and the real-time voltage value when the real-time voltage value is inconsistent with the target voltage value comprises:
when the real-time voltage value is inconsistent with the target voltage value, calculating a difference value between the target voltage value and the real-time voltage value through the central processing module;
calculating a multiplication value of the difference value and a preset parameter through the central processing module;
acquiring a historical voltage value of the voltage compensation module at the last moment through the central processing module;
calculating the sum of the multiplied value and the historical voltage value as a compensation signal through the central processing module;
sending, by the central processing module, the compensation signal to the voltage compensation module.
4. The method of claim 1, further comprising:
and when a termination instruction input by a user is received through the peripheral keyboard, stopping the output of the target voltage.
5. A charging pile test power supply compensation system is characterized by comprising a power grid access end, a test power supply output end, an external keyboard, an AD conversion module, a central processing module and a plurality of voltage compensation modules;
the input end of the power grid access end is connected with a preset power grid, and the output end of the power grid access end is respectively connected with the voltage input ends of the voltage compensation modules and is used for receiving initial voltage output by the preset power grid and respectively transmitting the initial voltage to the voltage input ends of the voltage compensation modules;
the input end of the AD conversion module is respectively connected with the voltage output ends of the voltage compensation modules and is used for collecting real-time voltage values of the voltage compensation modules;
the output end of the AD conversion module is connected with the first input end of the central processing module and is used for transmitting the real-time voltage value to the central processing module;
the second input end of the central processing module is connected with the peripheral keyboard and used for receiving a target voltage value input through the peripheral keyboard;
the first output end of the central processing module is connected with the voltage compensation ends of the voltage compensation modules and used for generating a compensation signal according to the difference value between the target voltage value and the real-time voltage value and sending the compensation signal to the voltage compensation module;
the voltage output ends of the plurality of voltage compensation modules are also respectively connected with the output end of the test power supply, and are used for performing voltage compensation according to the compensation signal and outputting a target voltage corresponding to the target voltage value to the output end of the test power supply;
the test power supply output end is used for outputting the target voltage;
the voltage compensation module comprises a power amplifier switch power supply, a switch power amplifier and a digital synchronous tracking amplifier;
the input end of the power amplifier switch power supply is connected with the output end of the power grid access end, and the output end of the power amplifier switch power supply is connected with the power supply end of the switch power amplifier and used for providing the initial voltage as the power supply of the switch power amplifier;
the voltage input end of the digital synchronous tracking amplifier is connected with the output end of the power grid access end, the voltage compensation end of the digital synchronous tracking amplifier is connected with the first output end of the central processing module, and the voltage output end to be amplified of the digital synchronous tracking amplifier is connected with the input end of the switching power amplifier and used for generating voltage to be amplified according to the initial voltage and the compensation signal and transmitting the voltage to be amplified to the switching power amplifier;
and the output end of the switching power amplifier is connected with the output end of the test power supply and used for amplifying the voltage to be amplified, generating a target voltage corresponding to the target voltage value and transmitting the target voltage to the output end of the test power supply.
6. The system of claim 5, further comprising a display screen coupled to the second output of the central processing module.
7. The system of claim 5, wherein the digital synchronous tracking amplifier comprises a first voltage transformer, a DA converter, and a set of operational amplifiers;
a primary winding of the first voltage transformer is connected with an output end of the power grid access end, and a secondary winding of the first voltage transformer is connected with a first input end of the DA converter and used for receiving the initial voltage and transmitting the initial voltage to the DA converter;
and the second input end of the DA converter is connected with the first output end of the central processing module, and the output end of the DA converter is connected with the inverting input end of the operational amplifier group and used for generating the voltage to be amplified according to the initial voltage and the compensation signal.
8. The system of claim 5, wherein the AD conversion module comprises an AD converter, a reference power supply and a plurality of second voltage transformers;
a primary winding of each second voltage transformer is connected with a voltage output end of one voltage compensation module, and a secondary winding of each second voltage transformer is connected with an input end of the AD converter;
and the reference voltage end of the AD converter is connected with the reference power supply, and the reference power supply is used for providing a reference voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010996553.2A CN112018779B (en) | 2020-09-21 | 2020-09-21 | Charging pile test power supply compensation method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010996553.2A CN112018779B (en) | 2020-09-21 | 2020-09-21 | Charging pile test power supply compensation method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112018779A CN112018779A (en) | 2020-12-01 |
| CN112018779B true CN112018779B (en) | 2022-04-19 |
Family
ID=73522045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010996553.2A Active CN112018779B (en) | 2020-09-21 | 2020-09-21 | Charging pile test power supply compensation method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112018779B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932666A (en) * | 2016-05-18 | 2016-09-07 | 中国电力科学研究院 | Complex distribution network multi-time-scale digital-analog hybrid simulation system and simulation method therefor |
| CN110247598B (en) * | 2018-03-09 | 2021-05-14 | 宝沃汽车（中国）有限公司 | Compensation method and compensation system of alternating current motor, motor controller and electric automobile |
| CN108808685B (en) * | 2018-03-26 | 2020-12-11 | 北京航天发射技术研究所 | Power supply voltage digital compensation system and method |
| CN111624428B (en) * | 2020-06-10 | 2021-11-26 | 南方电网科学研究院有限责任公司 | Fault diagnosis device of alternating-current charging pile supporting remote cloud service |
| CN111458652B (en) * | 2020-06-10 | 2022-08-02 | 南方电网科学研究院有限责任公司 | Fault determination method, device and equipment for direct current charging pile |
-
2020
- 2020-09-21 CN CN202010996553.2A patent/CN112018779B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112018779A (en) | 2020-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102315789B (en) | Three-level inverter, power conditioner, and power generating system | |
| CN100555832C (en) | Adopt the power conversion unit and the method for the translation of DC bus | |
| CN102611289B (en) | Instantaneous harmonic estimation and compensation type single-phase inverter power supply and control method of single-phase inverter power supply | |
| CN109066820B (en) | Parallel inverter power sharing device based on current droop characteristics and control method | |
| CN104836464B (en) | Neutral-point-potential balance control device and method for direct current side of VIENNA rectifier | |
| CN103795284B (en) | For estimating the device of the electric capacity of DC bus capacitor device in inverter | |
| CN103217999B (en) | Numerical-control direct-current power source | |
| CN203204085U (en) | A comprehensive testing system used for casually inspecting the quality of a distribution transformer | |
| CN100525076C (en) | Amplifier apparatus and method | |
| CN109655776A (en) | The broadband properties test macro and method of ground electrode circuit DC current transformer | |
| CN104601028A (en) | Neutral-point voltage control system and method for parameter on-line tuning | |
| CN103683966A (en) | Regenerative inverter device and inverter device using power cell unit | |
| CN201490954U (en) | Novel three-phase driver for stepping motor | |
| CN102809684B (en) | Power detection method and circuit for primary side circuit of power supply unit | |
| CN110531127B (en) | Power source | |
| CN112018779B (en) | Charging pile test power supply compensation method and system | |
| US7043377B2 (en) | Power-saving effect display device in an inverter device | |
| CN103633659A (en) | Energy storage converter charging and discharging control system without direct current sensor | |
| CN111007448A (en) | Multifunctional electrical tester calibration device and calibration method thereof | |
| CN101771356B (en) | UPS voltage compensation value-acquiring method and application thereof | |
| CN107807334B (en) | Test method and device | |
| CN103532415A (en) | Space vector modulation scheme of four-bridge-arm converter based on gh gamma coordinate system | |
| TW201032446A (en) | Control device for an AC-DC boost converter applied in unbalanced three-phase input voltage condition | |
| CN209446692U (en) | A kind of detection circuit and DC Electronic Loads for grid-connecting apparatus | |
| CN209844854U (en) | Inversion test correction device applied to rectifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |