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CN107315122B - Fill electric pile testing arrangement - Google Patents

Fill electric pile testing arrangement Download PDF

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Publication number
CN107315122B
CN107315122B CN201710702670.1A CN201710702670A CN107315122B CN 107315122 B CN107315122 B CN 107315122B CN 201710702670 A CN201710702670 A CN 201710702670A CN 107315122 B CN107315122 B CN 107315122B
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CN
China
Prior art keywords
resistor
signal
charging pile
diode
tested
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CN201710702670.1A
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Chinese (zh)
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CN107315122A (en
Inventor
江磊
李晋川
吴小海
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Shanghai Thaisen Electric Technology Co ltd
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Shanghai Thaisen Electric Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

The embodiment of the invention discloses a charging pile testing device, which comprises a CP signal measuring circuit and a CC resistance measuring circuit; in the process of testing the charging pile to be tested, the CP signal measurement circuit is connected with a CP control lead of the charging pile to be tested and is used for measuring the peak value, the valley value, the frequency and the duty ratio of a CP signal of the charging pile to be tested; in the process of testing the charging pile to be tested, the CC resistance measurement circuit is connected with a CC control lead of the charging pile to be tested and is used for measuring the CC resistance value of the charging pile to be tested. The device realizes the measurement of the electrical parameters of the charging pile to be tested through the two tested circuits, so that the charging pile to be tested is tested more comprehensively, and the existing charging safety problem caused by the fact that the charging pile is not tested in place is avoided.

Description

Fill electric pile testing arrangement
Technical Field
The invention relates to the technical field of electric vehicle charging, in particular to a charging pile testing device.
Background
Along with the rapid popularization and promotion of the charging pile, the charging pile needs to be subjected to function detection after production or installation, and the charging pile is troublesome in use of an automobile real vehicle test, so that a specific testing device is required for testing. The test device is usually composed of an alternating current charging socket, a voltmeter and an S2 switch simulation device. The alternating current charging socket is used as a connecting device of the charging pile, the voltmeter is used for measuring voltage, and the S2 switch is used for simulating a charging mode. The existing testing device can only test the charging function and cannot measure the detailed electrical parameters of the control guide circuit.
In the process of implementing the embodiment of the invention, the inventor finds that the existing testing device can only test the charging function and cannot measure the detailed electrical parameters of the control guide circuit.
Disclosure of Invention
The invention aims to solve the technical problem that the existing testing device can only test the charging function and cannot measure the detailed electrical parameters of the control guide circuit.
Aiming at the technical problems, the embodiment of the invention provides a charging pile testing device which comprises a CP signal measuring circuit and a CC resistance measuring circuit;
in the process of testing the charging pile to be tested, the CP signal measurement circuit is connected with a CP control lead of the charging pile to be tested and is used for measuring the peak value, the valley value, the frequency and the duty ratio of a CP signal of the charging pile to be tested;
in the process of testing the charging pile to be tested, the CC resistance measurement circuit is connected with a CC control lead of the charging pile to be tested and is used for measuring the CC resistance value of the charging pile to be tested.
Optionally, the display module is further included;
the display module is connected with the CC resistance measurement circuit and the CP signal measurement circuit and is used for displaying the CC resistance value measured by the CC resistance measurement circuit and displaying the frequency, the duty cycle, the valley value and the peak value of the CP signal measured by the CP signal measurement circuit.
Optionally, the CP signal measurement circuit includes a first measurement circuit for measuring a peak value of the CP signal, a second measurement circuit for measuring a frequency and a duty cycle of the CP signal, and a third measurement circuit for measuring a valley value of the CP signal;
the first measuring circuit comprises a first diode, a second diode, a first capacitor, a first resistor, a second resistor and a singlechip;
the first end of the first diode is used as an input end of the first measuring circuit, the second end of the first diode is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the common end;
the first end of the first resistor is connected with the first end of the first capacitor, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the common end;
the first end of the second resistor is connected with the input end of a first ADC sampling channel of the singlechip, and the first output end corresponding to the first ADC sampling channel is connected with the display module;
the second diode is used as a clamping diode, a first end of the second diode is connected with a high level, and a second end of the second diode is connected with an input end of the first ADC sampling channel;
in the process of testing the charging pile to be tested, the CP signal charges the first capacitor through the first diode, the first capacitor discharges through the first resistor and the second resistor and transmits the first capacitor to the first ADC sampling channel, and the singlechip calculates the peak value of the CP signal according to the signal transmitted to the first ADC sampling channel.
Optionally, the second measurement circuit includes a third diode, a third resistor, a fourth diode, a fifth resistor and the singlechip;
the first end of the third diode is used as an input end of the second measuring circuit, the second end of the third diode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the common end;
the first end of the third resistor is connected with the first end of the fourth diode, the first end of the fourth diode is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the charging control switch;
the second end of the fourth diode is connected with the first end of the fifth resistor and the pulse sampling channel of the singlechip, and the second end of the fifth resistor is connected with a high level; the second output end corresponding to the pulse sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip determines the frequency and the duty ratio of the signal transmitted to the pulse sampling channel through a timing capturing function, and displays the frequency and the duty ratio through the display module.
Optionally, the third measurement circuit comprises a fifth diode, a second capacitor, an addition circuit and the singlechip;
the first end of the fifth diode is used as the input end of the third measuring circuit, the second end of the fifth diode is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the common end;
the first end of the second capacitor is connected with the first end of the adding circuit, the second end of the adding circuit is connected with the second ADC sampling channel of the singlechip, and the third output end corresponding to the second ADC sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip converts the analog signal transmitted to the second ADC sampling channel into a digital signal, calculates the trough value of the CP signal according to the adding circuit, and displays the trough value of the CP signal through the display module.
Optionally, the adding circuit includes a sixth resistor, a seventh resistor, a first follower amplifier, and a second follower amplifier;
the first end of the second capacitor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the first end of the seventh resistor and the input end of the first follower amplifier, and the output end of the first follower amplifier is connected with the second ADC sampling channel of the singlechip;
the input end of the second following amplifier is connected with the reference voltage, and the output end of the second following amplifier is connected with the second end of the seventh resistor.
Optionally, the CC resistance measurement circuit includes an eighth resistor, a third follower amplifier, a fourth follower amplifier, and the single chip microcomputer;
in the process of testing the charging pile to be tested, the first end of the eighth resistor is connected with the CC control lead and the input end of the third follower amplifier;
the input end of the fourth following amplifier is connected with the reference voltage, and the output end of the fourth following amplifier is connected with the second end of the eighth resistor;
the output end of the third following amplifier is connected with a third ADC sampling channel of the singlechip, and a fourth output end corresponding to the third ADC sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip converts the analog signal transmitted to the third ADC sampling channel into a digital signal, calculates the resistance value of the CC resistor according to the eighth resistor, and displays the resistance value of the CC resistor through the display module.
Optionally, the circuit further comprises a ninth resistor and a third capacitor arranged between the output end of the third following amplifier and the third ADC sampling channel;
the output end of the third follower amplifier is connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the third ADC sampling channel and the first end of the third capacitor, and the second end of the third capacitor is connected with the common end;
and the ninth resistor and the third capacitor perform filtering processing on the analog signal output from the output end of the third follower amplifier, and transmit the filtered analog signal to the third ADC sampling channel.
Optionally, the system further comprises a CP indicator lamp and a CC indicator lamp, wherein the CP indicator lamp and the CC indicator lamp are both connected with the singlechip;
the singlechip judges whether the frequency of the CP signal is in a preset frequency range and whether the duty ratio is in a preset duty ratio range, and if the frequency of the CP signal is not in the preset frequency range or the duty ratio of the CP signal is not in the preset duty ratio range, the CP indicator lamp is controlled to send out first prompt information corresponding to that the CP signal does not meet the requirement;
and the singlechip judges whether the resistance value of the CC resistor is in a preset CC resistance range, and if the resistance value of the CC resistor is not in the preset CC resistance range, the CC indicator lamp is controlled to send out second prompt information corresponding to that the CC resistor does not meet the requirement.
Optionally, the device further comprises a voltmeter and a load expansion port;
in the process of testing the charging pile to be tested, the voltmeter displays a voltage value for measuring the voltage output by the charging pile.
The embodiment of the invention provides a charging pile testing device which comprises a circuit for testing the peak value, the valley value, the frequency and the duty ratio of a CP signal of a charging pile to be tested and a circuit for measuring the CC resistance of the charging pile to be tested. The electric parameters of the charging pile to be tested are measured through the two tested circuits, so that the charging pile to be tested is tested more comprehensively, and the existing charging safety problem caused by the fact that the charging pile is not tested in place is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a charging pile testing device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an external structure of a charging pile testing device according to another embodiment of the present invention;
FIG. 3 is a circuit diagram of a CP signal measurement circuit according to another embodiment of the present invention;
fig. 4 is a circuit diagram of a CC resistance measuring circuit according to another embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of a charging pile testing device according to the present embodiment. Referring to fig. 1, the apparatus includes:
a CP signal measurement circuit 101 and a CC resistance measurement circuit 102;
in the process of testing the charging pile to be tested, the CP signal measurement circuit 101 is connected to a CP control lead of the charging pile to be tested (as shown in fig. 1, through connection between an ac charging socket 107 of the charging pile to be tested and the CP control lead of the charging pile to be tested), and is used for measuring a peak value, a valley value, a frequency and a duty ratio of a CP signal of the charging pile to be tested;
in the process of testing the charging pile to be tested, the CC resistance measurement circuit 102 is connected to the CC control lead of the charging pile to be tested (as shown in fig. 1, through the ac charging socket 107 of the charging pile to be tested and the CC control lead of the charging pile to be tested), and is used for measuring the CC resistance value of the charging pile to be tested.
It should be noted that, the charging pile testing device provided in this embodiment is used for testing a charging pile of a vehicle. Traditional device to fill electric pile and carry out test can only be to the voltage size that fills electric pile output, and test item is single, can't in time discover the unusual of filling electric pile, avoids some security risks. The charging pile testing device provided by the embodiment is additionally provided with a circuit for measuring the CC resistance and the CP signal of the charging pile on the basis of the traditional charging pile testing device, so that the testing project for testing the charging pile is perfected, the charging pile to be tested is tested more comprehensively, and the charging safety problem caused by the fact that the charging pile is not tested in place is avoided.
It can be understood that, as shown in fig. 1, the charging pile testing device provided in this embodiment may only include the CP signal measurement circuit 101 and the CC resistance measurement circuit 102 described above, and may further include a power supply circuit 103, an ac voltmeter 105, a charging control switch 104, and a load expansion interface 106. As shown in fig. 1, in the process of testing the charging pile to be tested, the ac charging socket 107 is connected to the power supply circuit 103 (the neutral line L, the live line N, and the ground line PE are respectively connected), and the ac voltmeter 105 measures the voltage between the neutral line L and the live line N, that is, measures the voltage output by the charging pile. The charging control switch 104 is used for controlling the on-off of a circuit between the charging pile and the charging pile testing device. The load expansion interface 106 is used to connect other loads.
The embodiment provides a charging pile testing device, which comprises a circuit for testing the peak value, the valley value, the frequency and the duty ratio of a CP signal of a charging pile to be tested and a circuit for measuring the CC resistance of the charging pile to be tested. The electric parameters of the charging pile to be tested are measured through the two tested circuits, so that the charging pile to be tested is tested more comprehensively, and the existing charging safety problem caused by the fact that the charging pile is not tested in place is avoided.
Further, on the basis of the above embodiment, fig. 2 shows a schematic outline structure of the charging pile testing device provided in this embodiment, and referring to fig. 2, the charging pile testing device further includes a display module 201;
the display module 201 is connected to the CC resistance measuring circuit 102 and the CP signal measuring circuit 101, and is configured to display the CC resistance value measured by the CC resistance measuring circuit 102, and display the frequency, duty cycle, valley value, and peak value of the CP signal measured by the CP signal 101 measuring circuit.
The load expansion interface 106 is specifically disposed on a side of the charging pile testing device, as shown at 203 in fig. 2, and the charging control switch 104 is specifically disposed on a front side of the charging pile testing device, as shown at 204 in fig. 2. It is noted that the display device may be a display screen, for example, an LED display screen. In addition, the charging pile testing device provided in this embodiment further includes a CP indicator 205 and a CC indicator 206 disposed on the front surface, and is configured to prompt a tester through the CP indicator and the CC indicator when it is determined that the CP signal does not meet the requirement or the CC resistance is abnormal, which is not specifically limited in this embodiment.
The charging pile testing device provided by the embodiment further comprises a display module, wherein the display module displays the electrical parameters measured by the CC resistance measuring circuit and the CP signal measuring circuit, and a tester can know the electrical parameters of the charging pile to be tested through the display module, so that the performance of the charging pile is judged, and problems are found early.
Further, on the basis of the above-described respective embodiments, fig. 3 shows a circuit diagram of a CP signal measurement circuit, which includes, referring to fig. 3, a first measurement circuit 301 for measuring a peak value of the CP signal, a second measurement circuit 302 for measuring a frequency and a duty ratio of the CP signal, and a third measurement circuit 303 for measuring a valley value of the CP signal;
the first measurement circuit 301 includes a first diode D1, a second diode D2, a first capacitor C1, a first resistor R1, a second resistor R2, and a single chip microcomputer;
the first end of the first diode D1 is used as an input end of the first measurement circuit (as shown in fig. 3, in the process of testing the charging pile to be tested, the first end of the first diode D1 is connected with a CP signal), the second end of the first diode D1 is connected with the first end of the first capacitor C1, and the second end of the first capacitor C1 is connected with the common end DGND;
the first end of the first resistor R1 is connected with the first end of the first capacitor C1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is connected with the common end DGND;
the first end of the second resistor R2 is connected with the input end of a first ADC sampling channel of the singlechip, and the first output end corresponding to the first ADC sampling channel is connected with the display module;
the second diode D2 is used as a clamping diode, a first end of the second diode D2 is connected with a high level VCC, and a second end of the second diode D2 is connected with an input end of the first ADC sampling channel;
in the process of testing the to-be-tested charging pile, the CP signal charges the first capacitor C1 through the first diode D1, the first capacitor C1 discharges through the first resistor R1 and the second resistor R2 and transmits the first capacitor C1 to the first ADC sampling channel, and the singlechip calculates the peak value of the CP signal according to the signal transmitted to the first ADC sampling channel.
In the process of testing the charging pile to be tested, the peak value of the CP signal charges the first capacitor C1 through the first diode D1, and the first capacitor C1 has a voltage maintaining function. The first resistor R1 and the second resistor R2 form a voltage dividing circuit and are input to a first ADC sampling channel. The first resistor R1 and the second resistor R2 discharge the first capacitor C1, so that the measurement response speed can be improved when the peak value of the CP signal is reduced, and the first diode D1 is a clamp diode, so that the voltage input to the first ADC sampling channel is not higher than VCC.
According to the charging pile testing device, a signal including a peak value in a CP signal is converted into a digital signal through the first diode D1, the second diode D2, the first capacitor C1, the first resistor R1, the second resistor R2 and the first ADC sampling channel to display and determine the peak value of the CP signal.
Further, as shown in fig. 3, the second measurement circuit 302 includes a third diode D3, a third resistor R3, a fourth resistor R4, a fourth diode D4, a fifth resistor R5, and the single chip microcomputer;
the first end of the third diode D3 is used as an input end of the second measurement circuit, the second end of the third diode D3 is connected with the first end of the third resistor R3, and the second end of the third resistor R3 is connected with the common end DGND;
the first end of the third resistor R3 is connected with the first end of the fourth diode D4, the first end of the fourth diode D4 is connected with the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected with a charging control switch;
the second end of the fourth diode D4 is connected with the first end of the fifth resistor R5 and the pulse sampling channel of the singlechip, and the second end of the fifth resistor R5 is connected with a high level VCC; the second output end corresponding to the pulse sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip determines the frequency and the duty ratio of the signal transmitted to the pulse sampling channel through a timing capturing function, and displays the frequency and the duty ratio through the display module.
The third diode D3, the third resistor R3, the fourth resistor R4, the fourth diode D4, the fifth resistor R5 and the single chip microcomputer of the second measurement circuit 302 are described. The third diode D3, the third resistor R3 and the fourth resistor R4 are fixedly formed by a control guiding circuit specified in GB/T18487.1-2015. The fourth diode D4 and the fifth resistor R5 form a pulse conversion circuit, 9V square waves or 6V square waves are converted into 5V square waves, the 5V square waves are output to a pulse sampling channel of the singlechip, the frequency and the duty ratio of pulses are measured through the internal timing capturing function of the singlechip, and the measured frequency and the measured duty ratio are displayed through a display module.
After the singlechip receives the square wave, the period of the square wave is measured through a timing capturing function, and the reciprocal of the period is calculated to obtain the frequency of the CP signal. Meanwhile, the duty ratio of the CP signal is obtained by measuring the time ratio of the effective level within one period by the timing capturing function.
According to the charging pile testing device, the frequency and the duty ratio of the CP signal are measured through the third diode D3, the third resistor R3, the fourth resistor R4, the fourth diode D4, the fifth resistor R5 and the singlechip, and the frequency and the duty ratio are displayed through the display module, so that a tester can determine the frequency and the duty ratio of the CP signal through the display module.
Further, as shown in fig. 3, the third measuring circuit 303 includes a fifth diode D5, a second capacitor C2, an adder circuit (e.g., a sixth resistor R6, a seventh resistor R7, a first follower amplifier U1 and a second follower amplifier U2 in fig. 3) and the single chip microcomputer;
a first end of the fifth diode D5 is used as an input end of the third measurement circuit 303, a second end of the fifth diode D5 is connected to the first end of the second capacitor C2, and a second end of the second capacitor C2 is connected to the common end DGND;
the first end of the second capacitor C2 is connected with the first end of the adding circuit, the second end of the adding circuit is connected with the second ADC sampling channel of the singlechip, and the third output end corresponding to the second ADC sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip converts the analog signal transmitted to the second ADC sampling channel into a digital signal, calculates the trough value of the CP signal according to the adding circuit, and displays the trough value of the CP signal through the display module.
The adding circuit comprises a sixth resistor R6, a seventh resistor R7, a first following amplifier U1 and a second following amplifier U2;
the first end of the second capacitor C2 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the first end of the seventh resistor R7 and the input end of the first follower amplifier U1, and the output end of the first follower amplifier U1 is connected with the second ADC sampling channel of the singlechip;
the input end of the second following amplifier U2 is connected with a reference voltage V ref The output end of the second follower amplifier U2 is connected with the second end of the seventh resistor R7.
Further, the second follower amplifier U2 and the reference voltage V ref Also included is a resistor R10. The resistor R10 is used for limiting current and protecting a circuit.
The second capacitor C2 is charged by the fifth diode D5, and the voltage holding function is provided for C2. Because the voltage of the second capacitor C2 is a negative value and cannot directly enter the singlechip for measurement, an addition circuit is formed by the second following amplifier U2, the sixth resistor R6 and the seventh resistor R7, the negative pressure is raised, and then the negative pressure is input into a second ADC input channel of the singlechip for sampling calculation. Wherein V is ref As a reference voltage, a follower amplifier circuit output to a seventh resistor R7 is constituted by R10 and a second follower amplifier U2 so as to supply a positive voltage in the adder circuit.
Specifically, according to the circuit connection relationship, the voltage at the first end of the second capacitor C2 is set to be V 1 The voltage input to the second ADC input channel is V 0 The resistance value of the sixth resistor R6 is R 6 The resistance value of the seventh resistor R7 is R 7 Then:
according to the above, the valley voltage of the CP signal
Thereby, the singlechip collects the voltage value V input to the singlechip 0 According toThe trough value of the CP signal can be calculated, and then the trough value of the CP signal is displayed through the display module.
According to the charging pile testing device provided by the embodiment, the third measuring circuit 303 comprises the fifth diode D5, the second capacitor C2, the adding circuit and the singlechip, so that the valley value of the CP signal of the charging pile can be measured, and the valley value of the CP signal is displayed through the display module, so that a tester can determine the valley value of the CP signal through the display module.
Further, on the basis of the above embodiments, as shown in fig. 4, the CC resistance measurement circuit includes an eighth resistor R8, a third follower amplifier U3, a fourth follower amplifier U4, and the single chip microcomputer;
in the process of testing the charging pile to be tested, the first end of the eighth resistor R8 is connected with the CC control lead (equivalent to connecting with a CC resistor) and the input end of the third following amplifier U3;
the input end of the fourth following amplifier U4 is connected with a reference voltage V ref The fourth follower amplifier V ref The output end of the third resistor R8 is connected with the second end of the fourth resistor R;
the output end of the third following amplifier U3 is connected with a third ADC sampling channel of the singlechip, and a fourth output end corresponding to the third ADC sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip converts an analog signal transmitted to the third ADC sampling channel into a digital signal, calculates the resistance value of the CC resistor according to the eighth resistor R8, and displays the resistance value of the CC resistor through the display module.
Still further, the circuit further comprises a ninth resistor R9 and a third capacitor C3 which are arranged between the output end of the third following amplifier U3 and the third ADC sampling channel;
the output end of the third follower amplifier U3 is connected with the first end of the ninth resistor R9, the second end of the ninth resistor R9 is connected with the third ADC sampling channel and the first end of the third capacitor C3, and the second end of the third capacitor C3 is connected with the common end DGND;
the ninth resistor R9 and the third capacitor C3 perform filtering processing on the analog signal output from the output end of the third follower amplifier U3, and transmit the analog signal after the filtering processing to the third ADC sampling channel.
Further, the fourth follower amplifier U4 and the reference voltage V ref And a resistor R11 is also included. The resistor R11 is used for limiting current and protecting a circuit.
It should be noted that, in the CC resistance measurement circuit provided in this embodiment, the eighth resistor R8 and the CC resistor form a group of voltage dividing circuits, and after being amplified by the third follower amplifier U3, the CC resistance is filtered by the ninth resistor R9 and the third capacitor C3, and then enters the third ADC sampling channel of the single-chip microcomputer, and the resistance of the CC is obtained by sampling and calculating.
Specifically, according to the circuit connection relationship, the voltage at the connection point of the CC resistor and the eighth resistor R8 is set as V 2 The voltage input to the third ADC input channel is V a The resistance value of the CC resistor is R cc The resistance value of the eighth resistor R8 is R 8 Then:
according to the above, the resistance of the CC resistor
Thereby, the singlechip collects the voltage value V input to the singlechip a According toThe resistance of the CC resistor can be calculated, and then the resistance of the CC resistor is displayed through the display module.
According to the charging pile testing device, the resistance of the CC resistor is measured through the eighth resistor R8, the third following amplifier U3, the fourth following amplifier U4 and the singlechip, and the resistance of the CC resistor is displayed through the display module, so that a tester can determine the resistance of the CC resistor of the charging pile to be tested through the display module.
Further, based on the above embodiments, as shown in fig. 2, the device further includes a CP indicator lamp 205 and a CC indicator lamp 206, where the CP indicator lamp 205 and the CC indicator lamp 206 are both connected to the single-chip microcomputer;
the singlechip judges whether the frequency of the CP signal is in a preset frequency range and whether the duty ratio is in a preset duty ratio range, and if the frequency of the CP signal is not in the preset frequency range or the duty ratio of the CP signal is not in the preset duty ratio range, the CP indicator lamp is controlled to send out first prompt information corresponding to that the CP signal does not meet the requirement;
and the singlechip judges whether the resistance value of the CC resistor is in a preset CC resistance range, and if the resistance value of the CC resistor is not in the preset CC resistance range, the CC indicator lamp is controlled to send out second prompt information corresponding to that the CC resistor does not meet the requirement.
The preset frequency range is a predetermined frequency range, for example, the frequency of CP is 1khz±3%, and the range of CP duty cycle is 10% -85%. And controlling the CP indicator lamp to send out first prompt information as long as one of the frequency and the duty ratio of the CP signal is not in a preset range. For example, when the frequency or the duty ratio does not meet the requirement, the CP pointer lamp 205 is controlled to be turned on. Similarly, when the resistance value of the CC resistor does not meet the requirement, the CC indicator light 206 is controlled to be turned on.
In the method provided by the embodiment, after power is supplied, the detection board is electrified, the CC resistance of the gun head is measured through the CC measuring resistor, the resistance value of the gun head is compared, if the national standard requirement is met, the CC indicator lamp is lighted to indicate that the CC resistance is qualified, and otherwise, the CC indicator lamp is not lighted. And the frequency, the duty ratio and the peak value of the CP signal are measured through the CP measuring circuit, if the frequency, the duty ratio and the peak value of the CP signal meet the national standard requirements, the CP indicating lamp is turned on, and otherwise, the CP indicating lamp is not turned on.
Further, on the basis of the above embodiments, the load expansion device further comprises a voltmeter and a load expansion port;
in the process of testing the charging pile to be tested, the voltmeter displays a voltage value for measuring the voltage output by the charging pile.
According to the charging pile testing device provided by the embodiment, the charging pile control switch simulates the guiding rule specified in the national standard through switching the connection state of the resistor, the charging pile output voltage can be enabled to be measured through switching the control switch, and the output voltage is measured through the AC voltmeter and displayed through the liquid crystal display. After power is supplied, the detection plate is electrified, the CC resistance of the gun head is measured through the CC measuring resistor, the peak value, the valley value, the frequency and the duty ratio of the measured CP signal and the resistance value of the measured CC resistance are displayed through the display module, and the comprehensive measurement of the electrical parameters of the charging pile is realized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (2)

1. The charging pile testing device is characterized by comprising a CP signal measuring circuit and a CC resistance measuring circuit;
in the process of testing the charging pile to be tested, the CP signal measurement circuit is connected with a CP control lead of the charging pile to be tested and is used for measuring the peak value, the valley value, the frequency and the duty ratio of a CP signal of the charging pile to be tested;
in the process of testing the charging pile to be tested, the CC resistance measurement circuit is connected with a CC control lead of the charging pile to be tested and is used for measuring the CC resistance value of the charging pile to be tested;
the display module is also included;
the display module is connected with the CC resistance measurement circuit and the CP signal measurement circuit and is used for displaying the CC resistance value measured by the CC resistance measurement circuit and displaying the frequency, the duty cycle, the valley value and the peak value of the CP signal measured by the CP signal measurement circuit;
the CP signal measuring circuit includes a first measuring circuit for measuring a peak value of the CP signal, a second measuring circuit for measuring a frequency and a duty ratio of the CP signal, and a third measuring circuit for measuring a valley value of the CP signal;
the first measuring circuit comprises a first diode, a second diode, a first capacitor, a first resistor, a second resistor and a singlechip;
the first end of the first diode is used as an input end of the first measuring circuit, the second end of the first diode is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the common end;
the first end of the first resistor is connected with the first end of the first capacitor, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the common end;
the first end of the second resistor is connected with the input end of a first ADC sampling channel of the singlechip, and the first output end corresponding to the first ADC sampling channel is connected with the display module;
the second diode is used as a clamping diode, a first end of the second diode is connected with a high level, and a second end of the second diode is connected with an input end of the first ADC sampling channel;
in the process of testing the charging pile to be tested, the CP signal charges the first capacitor through the first diode, the first capacitor discharges through the first resistor and the second resistor and transmits the first capacitor to the first ADC sampling channel, and the singlechip calculates the peak value of the CP signal according to the signal transmitted to the first ADC sampling channel;
the second measuring circuit comprises a third diode, a third resistor, a fourth diode, a fifth resistor and the singlechip;
the first end of the third diode is used as an input end of the second measuring circuit, the second end of the third diode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the common end;
the first end of the third resistor is connected with the first end of the fourth diode, the first end of the fourth diode is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the charging control switch;
the second end of the fourth diode is connected with the first end of the fifth resistor and the pulse sampling channel of the singlechip, and the second end of the fifth resistor is connected with a high level; the second output end corresponding to the pulse sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip determines the frequency and the duty ratio of a signal transmitted to the pulse sampling channel through a timing capturing function, and displays the frequency and the duty ratio through the display module;
the third measuring circuit comprises a fifth diode, a second capacitor, an adding circuit and the singlechip;
the first end of the fifth diode is used as the input end of the third measuring circuit, the second end of the fifth diode is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the common end;
the first end of the second capacitor is connected with the first end of the adding circuit, the second end of the adding circuit is connected with the second ADC sampling channel of the singlechip, and the third output end corresponding to the second ADC sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip converts an analog signal transmitted to the second ADC sampling channel into a digital signal, calculates a valley value of the CP signal according to the adding circuit, and displays the valley value of the CP signal through the display module;
the adding circuit comprises a sixth resistor, a seventh resistor, a first following amplifier and a second following amplifier;
the first end of the second capacitor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the first end of the seventh resistor and the input end of the first follower amplifier, and the output end of the first follower amplifier is connected with the second ADC sampling channel of the singlechip;
the input end of the second following amplifier is connected with a reference voltage, and the output end of the second following amplifier is connected with the second end of the seventh resistor;
the CC resistance measurement circuit comprises an eighth resistor, a third following amplifier, a fourth following amplifier and the singlechip;
in the process of testing the charging pile to be tested, the first end of the eighth resistor is connected with the CC control lead and the input end of the third follower amplifier;
the input end of the fourth following amplifier is connected with the reference voltage, and the output end of the fourth following amplifier is connected with the second end of the eighth resistor;
the output end of the third following amplifier is connected with a third ADC sampling channel of the singlechip, and a fourth output end corresponding to the third ADC sampling channel is connected with the display module;
in the process of testing the charging pile to be tested, the singlechip converts an analog signal transmitted to the third ADC sampling channel into a digital signal, calculates the resistance value of the CC resistor according to the eighth resistor, and displays the resistance value of the CC resistor through the display module;
the second ADC sampling channel is connected with the output end of the second follower amplifier;
the output end of the third follower amplifier is connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the third ADC sampling channel and the first end of the third capacitor, and the second end of the third capacitor is connected with the common end;
the ninth resistor and the third capacitor perform filtering processing on the analog signal output from the output end of the third follower amplifier, and transmit the analog signal after the filtering processing to the third ADC sampling channel;
the system also comprises a CP indicator lamp and a CC indicator lamp, wherein the CP indicator lamp and the CC indicator lamp are both connected with the singlechip;
the singlechip judges whether the frequency of the CP signal is in a preset frequency range and whether the duty ratio is in a preset duty ratio range, and if the frequency of the CP signal is not in the preset frequency range or the duty ratio of the CP signal is not in the preset duty ratio range, the CP indicator lamp is controlled to send out first prompt information corresponding to that the CP signal does not meet the requirement;
and the singlechip judges whether the resistance value of the CC resistor is in a preset CC resistance range, and if the resistance value of the CC resistor is not in the preset CC resistance range, the CC indicator lamp is controlled to send out second prompt information corresponding to that the CC resistor does not meet the requirement.
2. The apparatus of claim 1, further comprising a voltmeter and a load expansion port;
in the process of testing the charging pile to be tested, the voltmeter displays a voltage value for measuring the voltage output by the charging pile.
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CN108957141B (en) * 2018-07-27 2021-04-06 北京新能源汽车股份有限公司 Resistance detection device, charger and electric automobile who confirms CC end are connected
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