CN211627676U - Charger on-site tester - Google Patents
Charger on-site tester Download PDFInfo
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- CN211627676U CN211627676U CN201922226556.3U CN201922226556U CN211627676U CN 211627676 U CN211627676 U CN 211627676U CN 201922226556 U CN201922226556 U CN 201922226556U CN 211627676 U CN211627676 U CN 211627676U
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Abstract
The utility model relates to a charger field tester, which comprises an electric energy metering module, an error calculating module, a man-machine interaction interface module, a high-speed ADC sampling module and a control guide circuit module, wherein the charger field tester is provided with a direct current comparator for measuring heavy current, the direct current comparator is a double-iron-core structure consisting of an iron core A and an iron core B, and the iron core A and the iron core B are adjacently arranged; the iron core A and the iron core B are provided with an excitation winding, a detection winding Ws and a balance winding W2Winding W to be tested1Excitation winding connection methodA wave oscillator having excitation windings wound on the core A, detection windings Ws and balance windings W2Winding W to be tested wound on the iron core A and the iron core B1Passing through the iron core A and the iron core B; the iron core A of the DC comparator is made of a high-permeability soft magnetic material, and the iron core B of the DC comparator is made of a low-permeability ferrite material.
Description
Technical Field
The utility model belongs to the field detection electric automobile direct current machine instrument field that charges relates to the portable instrument that the on-the-spot detection electric automobile direct current let the motor is exclusively used in, concretely relates to let motor field test appearance.
Background
The difficulty of electric energy metering of the existing direct current charger lies in accurate measurement of direct current heavy current, the design target, namely the equipment level is 0.05, the precision of voltage and current of the direct current charger is at least 0.02, and the prior art is lack of the equipment, because the electric vehicle allows the requirement of fast human current quick charging and high-voltage direct current quick charging, the voltage is generally 200-700V, the current is 15-32A, no special detecting instrument exists, the common current detecting instrument cannot meet the use requirement easily, but with the development of new technology, the quick charging technology of higher voltage and larger current has shown superior quickness; the heavy current measurement mainly adopts a four-terminal resistance method, a Hall method, a magneto-optical effect measurement method and a direct current comparator method; when the four-terminal resistance method is used for measuring current, the precision is reduced due to self-heating of the resistor, the weight and the volume of the device are required to be increased for reducing heat, and the power consumed in measurement is larger; the Hall method is influenced by external temperature more than people when measuring current, so the precision is difficult to improve; the magneto-optical effect measuring method is simple to operate and can prevent electromagnetic interference, but the measuring precision is low; in order to solve the above problems, a field charger tester is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, and provide a quick-witted on-the-spot tester that charges that the precision is high, accommodation is wide, practical.
The purpose of the utility model is realized like this: a motor field tester comprises an electric energy metering module, an error calculation module, a human-computer interaction interface module, a high-speed ADC sampling module and a control guide circuit module, wherein the motor field tester is provided with a direct current comparator for measuring large current, the direct current comparator is a double-iron-core structure consisting of an iron core A and an iron core B, and the iron core A and the iron core B are arranged adjacently; the iron core A and the iron core B are provided with an excitation winding, a detection winding Ws and a balance winding W2Winding W to be tested1The excitation winding is connected with a square wave oscillator, the excitation winding is independently wound on the iron core A, and the detection winding Ws and the balance winding W are connected with each other2Winding W to be tested wound on the iron core A and the iron core B1Passing through the iron core A and the iron core B;
the iron core A of the direct current comparator is made of a high-permeability soft magnetic material, and the iron core B of the direct current comparator is made of a low-permeability ferrite material; the high-permeability soft magnetic material is any one or a mixture of any two or more of an iron powder core, an iron-silicon-aluminum powder core and a high-magnetic-flux powder core, and the low-permeability ferrite material is any one or a mixture of manganese-zinc power ferrite and manganese-zinc high-conductivity ferrite.
The utility model provides a fill quick-witted on-spot tester that charges still has following technical characteristic:
furthermore, the electric energy metering module comprises a computer metering unit, a microprocessor, an ADC module, a voltage transformer and a current transformer, and the electric energy metering module consists of a V/F converter, a phase-locked frequency doubling circuit, a triangular wave generating circuit, a pulse width modulation circuit, a pulse amplitude modulation circuit, a high-frequency pulse output circuit and a frequency divider.
Furthermore, the human-computer interaction interface module comprises an SDW1076-104-TN02W type liquid crystal display module, an RS232 interface and a TTL interface.
Furthermore, the high-speed ADC sampling module comprises a high-speed ADS1220 chip, and voltage and current signals converted by the voltage conversion unit and the current conversion unit enter the high-speed ADC sampling rod module for operation processing through signal conditioning.
Further, the control pilot circuit module comprises switches S1, S2, S3, S4, a CP loop ground resistor, an R2 simulator and an R3 simulator.
The double-iron-core structure enables odd harmonic components induced in the iron core to be mutually offset, even harmonics can be mutually enhanced, and even harmonic components which are beneficial to reaction signals and are small can be extracted.
When winding W to be tested1A large DC current I flows upwards1When the voltage is detected, the detection winding Ws detects magnetic flux, the magnetic flux is converted into a voltage signal through the magnetic flux detection module, the power amplifier is controlled to increase or decrease the output, and the voltage flows through the secondary winding W2Follow-up current I on2With increasing or decreasing current I1And I2The iron core passes through the iron core in the opposite direction, and finally reaches magnetic balance through continuous adjustment. According to the magnetic balance principle of the comparator, the method comprises the following steps:
W1I1＝W2I2formula (1)
Finishing to obtain:
the secondary current being proportional to the current to be measured, e.g. taking W11 turn, W2When 1000 turns, I1＝1000*I2，I2Sampling current through standard resistor, and measuring voltage U at two ends of resistorsThe available secondary current I2The current I to be measured is obtained from the formula (7)1(ii) a When the number of turns of the secondary winding is larger than that of the secondary winding, the purpose of large-current conversion measurement is achieved.
The output voltage of the DC comparator is sent to the FPGA for digital operation processing through the signal conditioning and ADC module, and then the DC large current is obtained through measurement.
meanwhile, because the on-site calibration instrument of the charger mostly runs outdoors and is influenced by the electromagnetic interference of human quantity, the project adopts a double-layer shielding technology, namely, the main shielding adopts a Fe-Si-Al material with high magnetic flux density, the inner shielding adopts the permalloy with high magnetic conductivity to carry out electromagnetic shielding, firstly, the iron core of the comparator is arranged in the permalloy shielding box to carry out independent shielding, and then the inner shielding box and the test circuit are placed in the main shielding box, so that the error can be reduced to 1 × 10-8. In addition, the device reduces the influence of leakage current among winding turns, between windings and the ground through related electrostatic shielding means.
The invention creates related design drawings and technical scheme modules as follows:
1. electric energy metering module
The voltage signal and the current signal are converted into small signals through the voltage transformer and the current transformer, and then are converted into digital signals through the ADC unit and are sent to the electric energy metering unit for processing.
The electric energy metering unit adopts a time division multiplier technology; the voltage signal after ADC is divided into two paths to be processed, one path is converted into a frequency signal, and the frequency signal is processed by a phase-locked frequency multiplication circuit, so that the waveform signal generated by a triangular wave generator and the signal of the measured electric energy are in an n-time synchronous whole-period state; one path of the pulse width modulation signal is directly input into a pulse width modulation circuit, and the pulse width modulation signal is compared with a synchronous triangular wave signal output by a triangular wave generator and then output to a pulse amplitude modulation circuit; the current signal after ADC is input to a pulse amplitude modulation circuit, and an instantaneous power signal P (t) output after multiplication with the pulse width modulation signal is input to a low-pass filter circuit and converted into an average power signal P (voltage value); the voltage value is converted into a frequency signal which is in direct proportion to the power value P through a V/F converter, and the frequency signal is sent to a microprocessor through a frequency divider to realize the metering of power and electric energy.
2. Error calculation module
The error calculation module carries out error calculation by comparing the output pulse signal of the tested electric motor with the electric energy pulse signal of the electric pile field tester, and the specific method is as follows:
the method for calculating the error gamma (%) of the detected charging pile comprises the following steps:
wherein: m is0-a preset number of pulses,
m-actually measured pulse number.
In the formula: c0Constant of standard meter, imp/kWh, N-number of pulses of low or high frequency of charge pile to be tested, CL-constant of the electric piles to be admitted, imp/kWh.
3. Human-computer interaction interface module
The module comprises a man-machine interaction system, the man-machine interaction system adopts an SDW1076-104-TN02W type liquid crystal display module, the module adopts a 1024 x 600 high-definition resolution design, and communication can be carried out through interfaces such as RS232 and TTL.
4. High-speed ADC sampling module
The module adopts a high-speed ADS1220 chip to convert an analog signal into a digital signal, the chip is a precise 24-digit digital-to-analog converter, and a device can complete high-speed data processing at the speed of 2000 times/second; the voltage and current signals converted by the voltage conversion unit and the current conversion unit enter the ADC module for operation processing through signal conditioning.
5. Control guidance circuit module
The control pilot circuit module comprises switches S1, S2, S3, S4, CP circuit grounding resistance, R2 simulator, R3 simulator and the like, and the measurable functions comprise: the voltage value at detection point 1, the duty cycle, frequency, rise time, fall time, etc. of the PWM signal of the CP loop.
The switches S1, S2, S3 and S4 are all controlled by relays, and under the normal condition, the switches S1 and S4 are normally closed switches, and the switches S2 and S3 are normally open switches. The main functions of the various components are described:
1) the switch S1 can simulate the PE line interruption fault and the charging process control of the alternating current charging pile.
2) The CC loop can measure RC resistance in the charging gun and determine the maximum current carrying capacity of the charging cable. 3) S
The 4-switch is used to simulate a CP interruption fault.
4) The grounding resistance between the CP and the PE is controlled by an S3 switch, and the simulation of the CP grounding fault can be realized.
5) The resistors R2 and R3 are used for CP circuit voltage limit test, and meet the test requirements of the maximum value and the minimum value specified in GB/T18487.1-2015 in the table A.5.
The utility model has the advantages that: the DC voltage measurement of the invention reaches 1150V, the DC current measurement reaches 300A, and the accuracy of the DC power/electric energy is 0.05 grade; the utility model adopts the above module and the DC comparator, after all components are integrated, the whole volume does not exceed the size of a common luggage case, thereby realizing portable high-precision measurement, convenient field measurement, fast speed and high efficiency; generally, the utility model has the advantages of the precision is high, accommodation is wide, practical.
Drawings
Fig. 1 is a schematic view of an electric motor field tester according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a dc comparator of a charger field tester according to an embodiment of the present invention;
fig. 3 is a diagram of a real object of a charger field tester according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a detection principle of a charger field tester according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electric energy metering module of a charger field tester according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a human-computer interaction interface module of a charger field tester according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a high-speed ADC sampling module of an on-site testing apparatus for motors according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a control guidance circuit module of an electric motor field tester according to an embodiment of the present invention;
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments; it should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1-8, a charger field tester, includes an electric energy metering module, an error calculating module, a human-computer interaction interface module, a high-speed ADC sampling module, and a control and guidance circuit module, the charger field tester is provided with a dc comparator for measuring a large current, the dc comparator is a double-iron-core structure composed of an iron core a and an iron core B, and the iron core a and the iron core B are adjacently arranged; the iron core A and the iron core B are provided with an excitation winding, a detection winding Ws and a balance winding W2Winding W to be tested1The excitation winding is connected with a square wave oscillator, the excitation winding is independently wound on the iron core A, and the detection winding Ws and the balance winding W are connected with each other2Winding W to be tested wound on the iron core A and the iron core B1Passing through the iron core A and the iron core B; the iron core A of the direct current comparator is made of a high-permeability soft magnetic material, and the iron core B of the direct current comparator is made of a low-permeability ferrite material; the high-permeability soft magnetic material is any one or a mixture of any two or more of an iron powder core, an iron-silicon-aluminum powder core and a high-magnetic-flux powder core, and the low-permeability ferrite material is any one or a mixture of manganese-zinc power ferrite and manganese-zinc high-conductivity ferrite.
The DC voltage measurement of the invention is up to 1150V, the DC current measurement is up to 300A, and the accuracy of DC power/electric energy is 0.05 grade.
As shown in fig. 5, in an embodiment of the present application, the electric energy metering module includes a computer metering unit and a microprocessor, an ADC module, a voltage transformer, and a current transformer, and the electric energy metering module is composed of a V/F converter, a phase-locked frequency doubling circuit, a triangular wave generating circuit, a pulse width modulation circuit, a pulse amplitude modulation circuit, a high-frequency pulse output circuit, and a frequency divider; the voltage signal and the current signal are converted into small signals through a voltage transformer and a current transformer, and then are converted into digital signals through an ADC unit and are sent to an electric energy metering unit for processing; the electric energy metering unit adopts a time division multiplier technology; the voltage signal after ADC is divided into two paths to be processed, one path is converted into a frequency signal, and the frequency signal is processed by a phase-locked frequency multiplication circuit, so that the waveform signal generated by a triangular wave generator and the signal of the measured electric energy are in an n-time synchronous whole-period state; one path of the pulse width modulation signal is directly input into a pulse width modulation circuit, and the pulse width modulation signal is compared with a synchronous triangular wave signal output by a triangular wave generator and then output to a pulse amplitude modulation circuit; the current signal after ADC is input to a pulse amplitude modulation circuit, and an instantaneous power signal P (t) output after multiplication with the pulse width modulation signal is input to a low-pass filter circuit and converted into an average power signal P (voltage value); the voltage value is converted into a frequency signal which is in direct proportion to the power value P through a V/F converter, and the frequency signal is sent to a microprocessor through a frequency divider to realize the metering of power and electric energy.
In an embodiment of the application, the error calculation module performs error calculation by comparing the output pulse signal of the electric machine to be allowed and the electric energy pulse signal of the electric pile field tester, and the specific method is as follows: the method for calculating the error gamma (%) of the detected charging pile comprises the following steps:
wherein: m is0-a preset number of pulses,
m-actually measured pulse number.
In the formula: c0Constant of standard meter, imp/kWh, N-number of pulses of low or high frequency of charge pile to be tested, CLA constant of the tested charging pile, imp/kWh.
As shown in FIG. 6, in one embodiment of the present application, the human-computer interaction interface module comprises an SDW1076-104-TN02W type liquid crystal display module, an RS232 interface and a TTL interface.
As shown in fig. 7, in an embodiment of the present application, the high-speed ADC sampling module includes a high-speed ADS1220 chip, and voltage and current signals converted by the voltage conversion unit and the current conversion unit enter the high-speed ADC sampling module for operation processing through signal conditioning; the module adopts a high-speed ADS1220 chip to convert an analog signal into a digital signal, the chip is a precise 24-digit digital-to-analog converter, and a device can complete high-speed data processing at the speed of 2000 times/second; the voltage and current signals converted by the voltage conversion unit and the current conversion unit enter the ADC module for operation processing through signal conditioning.
As shown in fig. 8, in one embodiment of the present disclosure, the control guidance circuit module includes switches S1, S2, S3, S4, CP circuit ground resistance, R2 simulator, R3 simulator; the control pilot circuit comprises switches S1, S2, S3, S4, CP circuit grounding resistance, R2 simulator, R3 simulator and the like, and the measurable functions comprise: detecting the voltage value at the point 1, the duty ratio, the frequency, the rising time, the falling time and the like of the PWM signal of the CP circuit; the S1, S2, S3 and S4 switches are controlled by relays, in a normal condition, S1 and S4 are normally closed switches, S2 and S3 are normally open switches, and main functions of all the components are described as follows:
1) the switch S1 can simulate the PE line interruption fault and the charging process control of the alternating current charging pile.
2) The CC loop can measure RC resistance in the charging gun and determine the maximum current carrying capacity of the charging cable. 3) The S4 switch is used to simulate a CP interruption fault.
4) The grounding resistance between the CP and the PE is controlled by an S3 switch, and the simulation of the CP grounding fault can be realized.
5) The resistors R2 and R3 are used for CP circuit voltage limit test, and meet the test requirements of the maximum value and the minimum value specified in GB/T18487.1-2015 in the table A.5.
Finally, it should be noted that: the above embodiments are provided to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. The utility model provides a quick-witted on-spot tester that charges, it includes electric energy metering module, error calculation module, human-computer interaction interface module, high-speed ADC sampling module, control guide circuit module which characterized in that: the charger field tester is provided with a direct current comparator for measuring large current, the direct current comparator is of a double-iron-core structure consisting of an iron core A and an iron core B, and the iron core A and the iron core B are arranged adjacently; the iron core A and the iron core B are provided with an excitation winding, a detection winding Ws and a balance winding W2Winding W to be tested1The excitation winding is connected with a square wave oscillator, the excitation winding is independently wound on the iron core A, and the detection winding Ws and the balance winding W are connected with each other2Winding W to be tested wound on the iron core A and the iron core B1Passing through the iron core A and the iron core B; the iron core A of the direct current comparator is made of a high-permeability soft magnetic material, and the iron core B of the direct current comparator is made of a low-permeability ferrite material; the high-permeability soft magnetic material is any one or a mixture of any two or more of an iron powder core, an iron-silicon-aluminum powder core and a high-magnetic-flux powder core, and the low-permeability ferrite material is any one or a mixture of manganese-zinc power ferrite and manganese-zinc high-conductivity ferrite.
2. The charger field tester according to claim 1, characterized in that: the electric energy metering module comprises a computer metering unit, a microprocessor, an ADC module, a voltage transformer and a current transformer, and consists of a V/F converter, a phase-locked frequency doubling circuit, a triangular wave generating circuit, a pulse width modulation circuit, a pulse amplitude modulation circuit, a high-frequency pulse output circuit and a frequency divider.
3. The charger field tester according to claim 1, characterized in that: the human-computer interaction interface module comprises an SDW1076-104-TN02W type liquid crystal display module, an RS232 interface and a TTL interface.
4. The charger field tester according to claim 1, characterized in that: the high-speed ADC sampling module comprises a high-speed ADS1220 chip, and voltage and current signals converted by the voltage conversion unit and the current conversion unit enter the high-speed ADC sampling module for operation processing through signal conditioning.
5. The charger field tester according to claim 1, characterized in that: the control guidance circuit module comprises switches S1, S2, S3, S4, a CP circuit grounding resistor, an R2 simulator and an R3 simulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922226556.3U CN211627676U (en) | 2019-12-12 | 2019-12-12 | Charger on-site tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922226556.3U CN211627676U (en) | 2019-12-12 | 2019-12-12 | Charger on-site tester |
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| CN211627676U true CN211627676U (en) | 2020-10-02 |
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| CN201922226556.3U Active CN211627676U (en) | 2019-12-12 | 2019-12-12 | Charger on-site tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325233A (en) * | 2021-06-02 | 2021-08-31 | 云南电网有限责任公司电力科学研究院 | System and method for modulating and measuring ripple electric energy in direct current electric energy |
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2019
- 2019-12-12 CN CN201922226556.3U patent/CN211627676U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325233A (en) * | 2021-06-02 | 2021-08-31 | 云南电网有限责任公司电力科学研究院 | System and method for modulating and measuring ripple electric energy in direct current electric energy |
| CN113325233B (en) * | 2021-06-02 | 2024-04-09 | 云南电网有限责任公司电力科学研究院 | System and method for modulating and measuring ripple electric energy in direct-current electric energy |
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