CN113335096B - A CC/CP diagnostic circuit and charger - Google Patents
A CC/CP diagnostic circuit and chargerInfo
- Publication number
- CN113335096B CN113335096B CN202110687446.6A CN202110687446A CN113335096B CN 113335096 B CN113335096 B CN 113335096B CN 202110687446 A CN202110687446 A CN 202110687446A CN 113335096 B CN113335096 B CN 113335096B
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- detection point
- voltage detection
- voltage
- circuit
- line
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2843—In-circuit-testing
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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- 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
- Y02T90/14—Plug-in electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a CC/CP diagnostic circuit and a charger, wherein the CC/CP diagnostic circuit comprises a main power circuit, a power supply circuit connected with the main power circuit, and a diagnostic circuit connected with a CC circuit and a CP circuit, the diagnostic circuit comprises a plurality of voltage detection points, and the fault state of the CC circuit and/or the CP circuit is determined by detecting the voltage of the voltage detection points. Compared with the prior art, the CC/CP diagnosis circuit provided by the invention can accurately identify faults of the CC circuit and the CP circuit, avoids wrong information interaction between the charging pile and the charger, and improves the safety of the charger.
Description
Technical Field
The invention relates to the technical field of electric automobile charging, in particular to a CC/CP diagnosis circuit and a charger.
Background
Along with the requirements of energy conservation and emission reduction and atmospheric pollution control, new energy automobiles are gradually commercially available in markets, and electric automobiles are the main force armies of the new energy automobiles. As an important part of the electric automobile, the charger has the function of converting electric energy of a power grid into battery energy storage of the electric automobile. Before connection is established, the charger and the charging pile can be in information interaction with each other through a CC signal (Connection Confirm) and a CP signal (Control Pilot) to ensure connection. However, for the electric automobile, when the CC/CP signal is open or short-circuited with the automobile body, the charging pile and the charging pile may interact with each other in error information, the charging pile and the charging pile may not accurately identify the fault state, and even may erroneously identify the fault connection state as normal connection, so as to initiate a charging request.
Patent CN210626574U proposes an ac charging pile fault detection device, which can only be used for detecting the fault of the ac charging pile end, cannot detect the fault of the vehicle end, and cannot obtain specific fault information.
Therefore, how to provide a CC/CP diagnostic circuit and a charger capable of accurately identifying various fault conditions is a technical problem to be solved in the industry.
Disclosure of Invention
Aiming at the problem that fault information cannot be accurately detected in the prior art, the invention provides a CC/CP diagnosis circuit and a charger.
The technical scheme of the invention is that the CC/CP diagnosis circuit comprises a main power circuit, a power supply circuit connected with the main power circuit, and a diagnosis circuit connected with a CC circuit and a CP circuit, wherein the diagnosis circuit comprises a plurality of voltage detection points, and the fault state of the CC circuit and/or the CP circuit is determined by detecting the voltage of the voltage detection points.
Further, the diagnosis circuit comprises a resistor R5 and a resistor R6 which are connected with the CC circuit, and a third voltage detection point and a fourth voltage detection point which are arranged between the resistor R5 and the resistor R6 and the CC circuit, and when the voltage of the third voltage detection point and/or the fourth voltage detection point is abnormal, the CC circuit fails.
Further, the CC circuit comprises a CC1 circuit and a CC2 circuit which are connected with each other, one end of the resistor R5 is connected to the CC1 circuit, the other end of the resistor R6 is connected with the power input, one end of the resistor R6 is connected to the CC2 circuit, and the other end of the resistor R6 is connected with the switch S7 in series and then is connected to the ground;
the third voltage detection point is arranged between the resistor R5 and the CC1 line, and the fourth voltage detection point is arranged between the resistor R6 and the CC2 line.
Further, when the charger is powered on for self-checking, 3 fault states are determined according to the voltage states of the third voltage detection point and the fourth voltage detection point, and the fault states are respectively:
When the voltages of the third voltage detection point and the fourth voltage detection point are the same and the voltages are 0V before and after the switch S7 is closed, judging that the CC line fault is short-circuited to the ground;
when the voltages of the third voltage detection point and the fourth voltage detection point are the same and the voltages are the power input voltages before and after the switch S7 is closed, judging that the CC line fault is short-circuited to the power input;
And when the third voltage detection point is the power input voltage before and after the switch S7 is closed and the voltage of the fourth voltage detection point is 0V after the switch S7 is closed, judging that the CC line has an open circuit fault in a third fault state.
Further, when the main power circuit is in a charging state, 4 fault states are determined according to the voltage states of the third voltage detection point and the fourth voltage detection point, and the fault states are respectively:
when the voltages of the third voltage detection point and the fourth voltage detection point are the same and are both 0V, judging a first fault state, wherein the CC line fault is short-circuited to the ground;
when the voltages of the third voltage detection point and the fourth voltage detection point are the same and are the power input voltage, judging a second fault state, wherein the CC line fault is short-circuited to the power input;
When the voltage of the third voltage detection point is the power input voltage and the voltage of the fourth voltage detection point is 0V, judging that the CC1 line has an open circuit fault in a fourth fault state;
And when the voltage of the third voltage detection point is unchanged and the voltage of the fourth voltage detection point is reduced to 0V, judging that the CC2 line has an open circuit fault in a fifth fault state.
Further, the diagnosis circuit comprises a resistor R1 and a resistor R3 which are connected with the CP line, and a second voltage detection point and a fifth voltage detection point which are arranged between the resistor R1 and the resistor R3 and the CP line, and when the voltage of the second voltage detection point and/or the fifth voltage detection point is abnormal, the CP line fails.
Further, the CP circuit comprises a CP1 circuit and a CP2 circuit, wherein one end of the resistor R1 is connected to the CP1 circuit, the other end of the resistor R1 is connected with the switch S2 in series and then is connected to the ground, the diagnosis circuit also comprises a resistor R2 and a switch S4 which are connected in parallel with the resistor R1 and the two ends of the switch S2, and the resistor R2 is used for dividing the voltage after being connected with the resistor R1 in parallel;
The second voltage detection point is arranged between the resistor R1 and the CP1 circuit, and the fifth voltage detection point is arranged between the resistor R3 and the CP2 circuit;
and a switch S5 is also connected between the second voltage detection point and the CP1 circuit, one end of the switch S5 is connected between the second voltage detection point and the CP1 circuit, and the other end of the switch S5 is connected with a power input.
Further, when the charger is powered on for self-checking, 3 fault states are determined according to the voltage states of the second voltage detection point and the fifth voltage detection point, and the fault states are respectively:
when the voltages of the second voltage detection point and the fifth voltage detection point are the same and the voltages are 0V before and after the switch S5 is closed, judging a sixth fault state that the CP line fault is short-circuited to the ground;
When the voltages of the second voltage detection point and the fifth voltage detection point are the same and the voltages are the power input voltages before and after the switch S5 is closed, judging a seventh fault state that the CP line fault is short-circuited to the power input;
And when the voltages of the second voltage detection point and the fifth voltage detection point are both 0V before the switch S5 is closed, and the voltage of the second voltage detection point becomes the power input voltage after the switch S5 is closed, and the voltage of the fifth voltage detection point is still 0V, judging that an eighth fault state is that the CP line has an open circuit fault.
Further, when the main power circuit is in a charging state, 4 fault states are determined according to the voltage states of the second voltage detection point and the fifth voltage detection point, and the fault states are respectively:
when the voltages of the second voltage detection point and the fifth voltage detection point are the same and are both 0V, judging a sixth fault state, wherein the CP line fault is short-circuited to the ground;
when the voltages of the second voltage detection point and the fifth voltage detection point are the same and are the power input voltage, judging a seventh fault state, wherein the CP line fault is short-circuited to the power input;
when the voltage of the second voltage detection point is 0V and the voltage of the fifth voltage detection point is the power input voltage, judging a ninth fault state that the CP1 line has an open circuit fault;
and when the voltage of the second voltage detection point is unchanged and the voltage of the fifth voltage detection point is reduced to 0V, judging that the CP2 line has an open circuit fault in a tenth fault state.
The invention also provides a charger, and when the charger completes the mutual connection with the CC signal and the CP signal of the charging pile through the CC circuit and the CP circuit, the charger starts to charge;
when at least one of the CC circuit and the CP circuit fails, stopping the charging mode of the charger;
the charger adopts the CC/CP diagnosis circuit to diagnose the faults of the CC circuit and the CP circuit.
Compared with the prior art, the invention has at least the following beneficial effects:
The invention provides a diagnosis circuit connected with a CC circuit and a CP circuit, wherein a plurality of voltage detection points are arranged on the diagnosis circuit, and faults in the circuit can be accurately identified by detecting the voltage of each voltage detection point, so that the safety of a charger is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the CC/CP signal self-test diagnosis prior to insertion of the charging gun of the present invention;
FIG. 2 is a schematic diagram of the CC/CP signal diagnosis after charging of the plug-in charging gun of the present invention;
Wherein, the detection point 1 represents a first voltage detection point, the detection point 2 represents a second voltage detection point, the detection point 3 represents a third voltage detection point, the detection point 4 represents a fourth voltage detection point, and the detection point 5 represents a fifth voltage detection point.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the invention, not to imply that each embodiment of the invention must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
The principles and structures of the present invention are described in detail below with reference to the drawings and the examples.
The existing charger and charging pile can carry out information interaction to ensure connection through CC signals and CP signals before connection is established, but for an electric automobile, when the CC/CP signals are open-circuited or short-circuited with an automobile body, the error information interaction of the charging pile and the charger can be caused, the charger and the charging pile can not accurately identify a fault state, the fault connection state can be incorrectly identified as correct connection, and a charging request is initiated, so that various problems are caused. The invention provides a CC/CP diagnosis circuit, which accurately determines the fault of a CC/CP circuit through a plurality of voltage detection points arranged on a diagnosis circuit, thereby improving the charging safety of a charger.
Referring to fig. 1, the present invention provides a CC/CP diagnostic circuit, which includes a main power circuit, and a power supply circuit (not shown) connected to the main power circuit, and is connected to the main power circuit through the power supply circuit, so as to charge the main power circuit. The system also comprises a diagnosis circuit connected with the CC line and the CP line, wherein the CC line is used for information interaction of the CC signal, the CP line is used for information interaction of the CP signal, and the diagnosis circuit is used for detecting the states of the CC line and the CP line. As can be seen from fig. 1, the present invention is provided with a plurality of voltage detection points, namely a detection point 2, a detection point 3, a detection point 4 and a detection point 5 (the detection point 2 is a second voltage detection point, the detection point 3 is a third voltage detection point, the detection point 4 is a fourth voltage detection point, and the detection point 5 is a fifth voltage detection point), by detecting the voltages of the plurality of voltage detection points, the states of the CC line and the CP line can be accurately determined, and when the diagnosis circuit determines that the CC line and/or the CP line has a fault, the diagnosis circuit can send a signal to the charging device, and then the power supply circuit is disconnected to stop charging the main power circuit.
The CC circuit comprises a CC1 circuit and a CC2 circuit, wherein the CC1 circuit is used for realizing information interaction of CC signals, the method is mainly used for diagnosing the state of the CC1 circuit, and the CC2 circuit is an auxiliary diagnosis circuit and can be used for further determining the state of the CC1 circuit. An input power supply is provided in the diagnostic circuit for supplying an input voltage, and a power supply voltage of +12v or a PWM signal input of 12V is used in the present invention. Referring to fig. 1, the diagnostic circuit includes a resistor R5 connected to the CC1 line and a resistor R6 connected to the CC2 line.
Specifically, one end of the resistor R5 is connected with an input power supply, the other end of the resistor R5 is connected with a CC1 circuit and is used as a matching resistor for CC1 signal detection, one end of the resistor R6 is connected with a CC2 circuit, the other end of the resistor R6 is connected with a switch S7 in series and then is connected to the ground, and the resistor R is used as the matching resistor for CC2 signal detection. The third voltage detection point is arranged between the resistor R5 and the CC1 circuit, and the fourth voltage detection point is arranged between the resistor R6 and the CC2 circuit.
Referring to fig. 1, when the charger is powered on for self-test, the CC line detection principle is as follows:
After the charger is awakened, when the CC circuit is in normal condition, when the switch S7 is opened, the resistor R6 is not provided with voltage, at the moment, as the third voltage detection point is connected with the input power supply (12V), the third voltage detection point can detect 12V voltage, the fourth voltage detection point detects 0V voltage, after the switch S7 is closed, the resistor R5 and the resistor R6 form a passage and divide the voltage of the input power supply uniformly, at the moment, the third voltage detection point and the fourth voltage detection point are connected to the same potential, the voltage is as follows 。
Meanwhile, in this case, 3 kinds of fault states (only 3 kinds of fault states exist in practical application) can be determined according to the voltage states of the third voltage detection point and the fourth voltage detection point, and 3 kinds of faults can be accurately identified in the invention) are respectively:
When the voltages of the third voltage detection point and the fourth voltage detection point are the same and the voltages are 0V before and after the switch S7 is closed, judging that the CC line fault is short-circuited to the ground;
in this case, since the voltages at the third voltage detection point and the fourth voltage detection point are not affected by the input power supply, and the voltages are constant at 0, which means that the voltage output by the power supply is pulled down to 0 (if the CC line is open, the third voltage detection point should have a voltage, so that the situation is not an open fault), it can be determined that the CC line is short-circuited to the ground of the vehicle body (the first fault state).
When the voltages of the third voltage detection point and the fourth voltage detection point are the same and the power input voltage is the power input voltage before and after the switch S7 is closed, judging a second fault state that the CC line fault is short-circuited to the power input (the battery of the electric vehicle is generally 12V);
In this case, the voltages at the third voltage detection point and the fourth voltage detection point are not affected by the input power supply, and the voltages are constant at 12V (power supply input voltage), so that it can be seen that in this case, the third voltage detection point and the fourth voltage detection point are connected with one voltage input, so that they are not affected by the input power supply, and it can be determined that the CC line is short-circuited to be connected to the 12V voltage power supply (second fault state) of the whole vehicle.
And when the third voltage detection point is the power input voltage before and after the switch S7 is closed and the voltage of the fourth voltage detection point is 0V after the switch S7 is closed, judging that the CC line has an open circuit fault in a third fault state.
In this case, it can be seen that the voltage at the third voltage detection point is not affected by the divided voltage of the resistor R6, and is made constant as the power input voltage, and the resistor R6 is turned off at this time, so that it can be determined that the CC line has an open circuit fault (third fault state).
By detecting the voltages of the third voltage detection point and the fourth voltage detection point before and after the switch S7 is closed, various fault problems of the CC circuit can be accurately identified, and the safety of the charging circuit is greatly improved.
Referring to fig. 2, the principle of CC line detection in the charged state is as follows:
When the charging gun is inserted and the main power circuit is in a charging state, when the CC circuit is in a normal condition, the switch S3 of the CC circuit is in a closed state, and at the moment, the third voltage detection point and the fourth voltage detection point are in the same potential, and the voltages are the same 。
Meanwhile, in this case, 4 kinds of fault states can be determined according to the voltage states of the third voltage detection point and the fourth voltage detection point, which are respectively:
when the voltages of the third voltage detection point and the fourth voltage detection point are the same and are both 0V, judging a first fault state, wherein the CC line fault is short-circuited to the ground;
in this case, the voltages at the third voltage detection point and the fourth voltage detection point are not affected by the input power supply, and the voltage is constant at 0, which means that the voltage output from the power supply is pulled down to 0, so that it can be determined that the CC line fault is shorted to the ground (first fault state).
When the voltages of the third voltage detection point and the fourth voltage detection point are the same and are the power input voltage, judging a second fault state, wherein the CC line fault is short-circuited to the power input;
In this case, it is explained that the voltages at the third voltage detection point and the fourth voltage detection point are not affected by the input power source, and the third voltage detection point and the fourth voltage detection point are electrically connected to one constant voltage input, so it can be determined that the CC line is short-circuited to the 12V voltage supply (second fault state) of the whole vehicle at this time.
When the voltage of the third voltage detection point is the power input voltage and the voltage of the fourth voltage detection point is 0V, judging that the CC1 line has an open circuit fault in a fourth fault state;
In this case, since the voltage at the third voltage detection point is 12V (voltage input voltage), it is shown that the voltage is not affected by the voltage division of the resistor R6 and the resistor RC in the charging gun, and it can be seen that the CC1 line is disconnected from the resistor R6 and the resistor RC, that is, it can be determined that the CC1 line has an open circuit fault (fourth fault state).
And when the voltage of the third voltage detection point is unchanged and the voltage of the fourth voltage detection point is reduced to 0V, judging that the CC2 line has an open circuit fault in a fifth fault state.
In this case, the voltage at the third voltage detection point is still maintained at the normal voltage, which means that the resistor RC in the charging gun has a voltage dividing function and divides the resistor R5, which means that the CC1 line is normal at this time, and the voltage at the fourth voltage detection point becomes 0, which means that the voltage input voltage is not received, so that it can be determined that the CC2 line has an open circuit fault (fifth fault state).
The third fault state is determined here at the time of the diagnostic circuit power-on self-test, which only determines that a CC line has a break fault and cannot determine whether a CC1 line or a CC2 line in particular has a break. The fourth fault state and the fifth fault state are determined by detection in the charging state, and can accurately identify faults of the CC1 line or the CC2 line.
When the charging gun is inserted into a charging state, the fault problem on the CC circuit can be accurately determined by detecting the voltage change on the third voltage detection point and the fourth voltage detection point, so that the safety of the charger is further improved.
When the CC circuit is judged to be in an abnormal state, the charger can report to the whole vehicle controller in time for processing, and the charging state is disconnected, so that the occurrence of subsequent problems is avoided.
Referring to fig. 1, the CP line includes a CP1 line and a CP2 line, and a resistor R1 and a resistor R3 connected to the CP1 line and the CP2 line. The CP1 line is used as a main detection line, and the CP2 line is used for auxiliary detection, so that the state of the CP1 line is further confirmed.
Specifically, one end of a resistor R1 is connected to the CP1 circuit, the other end of the resistor R1 is connected in series with a switch S2 and then grounded, a resistor R2 and a switch S4 are connected in parallel with two ends of the resistor R1 and the switch S2, one end of the resistor R3 is connected to the CP2 circuit, and the other end of the resistor R3 is connected in series with a switch S6 and then grounded. Here, the switch S2 and the switch S4 are CP switches required by national standards, the resistor R1 and the resistor R2 are matching resistors for CP1 signal detection, and the resistor R3 is a matching resistor for CP2 signal detection. The diagnostic circuit is also provided with a switch S5, one end of which is connected between the CP1 line and the resistor R1, and the other end of which is connected to the input power supply (12V), which together with the switch S6 and the switch S7 constitutes a logic switch of the CC/CP signal. Diodes are also provided in the CP1 and CP2 lines, which are mainly used for protection. The second voltage detection point is arranged between the resistor R1 and the CP1 circuit, and the fifth voltage detection point is arranged between the resistor R3 and the CP2 circuit.
Referring to fig. 1, after the battery charger is awakened, when the CP line is in a normal state, before the logic switch S5 is closed, since the CP line is connected to the input power supply, the voltages at the second voltage detection point and the fifth voltage detection point are both 0V, when the switch S5 is closed, the influence of the diode conduction voltage drops on the CP1 line and the CP2 line is ignored, and the second voltage detection point and the fifth voltage detection point are both connected to the input power supply, and are both at the same potential and are both 12V.
Meanwhile, in this case, 3 kinds of fault states (only 3 kinds of fault states in practical application can be accurately detected according to the 3 kinds of fault states) can be determined according to the voltage states of the second voltage detection point and the fifth voltage detection point, which are respectively:
when the voltages of the second voltage detection point and the fifth voltage detection point are the same and the voltages are 0V before and after the switch S5 is closed, judging a sixth fault state that the CP line fault is short-circuited to the ground;
In this case, since the second voltage detection point and the fifth voltage detection point are connected to the input power supply and the voltage thereof is constant to 0 when the switch S5 is closed, it can be seen that the voltages at the second voltage detection point and the fifth voltage detection point are pulled down to 0, that is, the second voltage detection point and the fifth voltage detection point are turned on with the ground, so it can be determined that the CP line fault is shorted to the vehicle body ground (sixth fault state).
When the voltages of the second voltage detection point and the fifth voltage detection point are the same and the voltages are the power input voltages before and after the switch S5 is closed, judging a seventh fault state that the CP line fault is short-circuited to the power input;
in this case, since there are voltages at the second voltage detection point and the fifth voltage detection point before the switch S5 is closed, it can be determined that the CP line provides one voltage input, and since the voltage thereof is constant and 12V, it can be determined that the CP line is short-circuited to the 12V voltage supply of the whole vehicle (seventh fault state).
And when the voltages of the second voltage detection point and the fifth voltage detection point are both 0V before the switch S5 is closed, and the voltage of the second voltage detection point becomes the power input voltage after the switch S5 is closed, and the voltage of the fifth voltage detection point is still 0V, judging that an eighth fault state is that the CP line has an open circuit fault.
In this case, since the voltage at the second voltage detection point is affected by the switch S5, it can be determined that the CP line is not shorted to the ground, and the voltage at the fifth voltage detection point is constant to 0, it can be seen that the voltage input from the power supply is not transmitted to the fifth voltage detection point, since the input voltage is transmitted to the second voltage detection point without passing through the CP line, it can be determined that the fault is in the CP line, and since the voltage at the fifth voltage detection point is 0, it can be determined that the CP line has an open circuit fault (eighth fault state).
Through the voltage change of the second voltage detection point and the fifth voltage detection point before and after the switch S5 is closed, the fault information of the CP circuit can be accurately identified, and the safety of the charging circuit is improved.
Referring to fig. 2, the CP line detection principle in the charged state is as follows:
When the charging gun is inserted, the main power circuit is in a charging state, the diagnosis logic switches S5 and S6 are opened in a normal state, the switch S1, the switch S2 and the switch S4 are closed, the circuit is powered by the charging pile, the resistor R2 is connected with the resistor R1 in parallel and then connected with the 1K resistor in the charging pile in series, the second voltage detection point and the fifth voltage detection point are arranged between the resistor R2 and the 1K resistor, the voltage is the voltage after the voltage division, the resistor R1 is 1.3 Kohm, the resistor R2 is 3.01 Kohm, the voltage of the second voltage detection point and the voltage of the fifth voltage detection point is 6V after the voltage is divided with the 1K resistor, namely, the voltage of the second voltage detection point and the voltage of the fifth voltage detection point is 6V in a normal condition.
The charging pile is internally provided with a first voltage detection point which is arranged at an output port of the charging pile and used for detecting the state of the charging pile, when the voltage of the first voltage detection point is 0, the charging pile is indicated to have faults, and when the voltage of the first voltage detection point is 12V, the charging pile is indicated to be normal.
When the charging pile is normal, 4 fault states can be judged according to the voltage states of the second voltage detection point and the fifth voltage detection point, and the fault states are respectively as follows:
when the voltages of the second voltage detection point and the fifth voltage detection point are the same and are both 0V, judging a sixth fault state, wherein the CP line fault is short-circuited to the ground;
In this case, since the voltages at the second voltage detection point and the fifth voltage detection point are constant to 0, indicating that the output voltage of the charging pile is pulled down, that is, the second voltage detection point and the fifth voltage detection point are connected to the ground, it can be determined that the CP line fault is shorted to the ground (sixth fault state).
When the voltages of the second voltage detection point and the fifth voltage detection point are the same and are the power input voltage, judging a seventh fault state, wherein the CP line fault is short-circuited to the power input;
in this case, since there are voltages at the second voltage detection point and the fifth voltage detection point, which indicate that the CP line has not developed an open-circuit fault, the voltage thereof is constant at 12V, which indicates that the voltages at the second voltage detection point and the fifth voltage detection point have not been divided by the 1K resistor on the charging pile, i.e., are connected to the power supply, it can be determined that the CP line fault is open-circuit connected to the power supply input, i.e., 12V power supply (seventh fault state).
When the voltage of the second voltage detection point is 0V and the voltage of the fifth voltage detection point is the power input voltage, judging a ninth fault state that the CP1 line has an open circuit fault;
In this case, since the voltage at the second voltage detection point is 0, it indicates that the CP line has an open circuit fault, but since the voltage at the fifth voltage detection point is 12V, it indicates that the CP2 line is normal, it can be determined that the CP1 line has an open circuit fault (ninth fault state).
And when the voltage of the second voltage detection point is unchanged and the voltage of the fifth voltage detection point is reduced to 0V, judging that the CP2 line has an open circuit fault in a tenth fault state.
In this case, since the voltage at the second voltage detection point is unchanged and remains at the voltage of 6V in the normal state, it is indicated that the CP1 line is not open, and the voltage at the fifth voltage detection point is 0, which indicates that the fifth voltage detection point does not receive the input voltage, it can be determined that the CP2 line is open (tenth fault state).
The eighth fault state is determined when the CP line is powered on for self-checking, and only it can be determined that the CP line has an open circuit fault, and it cannot be determined whether the CP1 line or the CP2 line is in particular faulty, and the ninth fault state and the tenth fault state are used for fault detection in the charging state, which can accurately identify faults of the CP1 line and the CP2 line.
A person skilled in the art can determine the faults of the CC line and the CP line through the self-checking mode, and if the specific faults cannot be accurately determined in the self-checking mode, a charging gun can be inserted to detect the specific faults of the CC line and the CP line.
Referring to fig. 2, L1, L2, and L3 are live wires, N is a zero wire, and is used as a power supply circuit for supplying power to the main power circuit, a plurality of switches are arranged between the power supply circuit and the main power circuit, and when the CC/CP diagnostic circuit determines that a fault exists in the CC circuit and/or the CP circuit, the charger can timely detect an abnormal state and report the abnormal state to the vehicle controller, and at this time, the plurality of switches between the power supply circuit and the main power circuit are disconnected to stop supplying power to the main power circuit.
The CC/CP diagnosis circuit provided by the invention can detect the CC circuit and the CP circuit in the charging state when the charging gun is not inserted and in the charging state when the charging gun is inserted respectively, and the voltages of each voltage detection point are different for each fault state, so that specific faults can be accurately judged according to the specific voltage states of each voltage detection point, a user can overhaul specific faults, and the safety of the charger is greatly improved.
The invention also provides a charger, and when the charger completes the mutual connection with the CC signal and the CP signal of the charging pile through the CC circuit and the CP circuit, the charger starts to charge;
when at least one of the CC circuit and the CP circuit fails, stopping the charging mode of the charger;
The charger adopts the CC/CP diagnosis circuit to diagnose faults of the CC circuit and the CP circuit.
Compared with the prior art, the method and the device can accurately identify the circuit faults, avoid the information interaction between the charger and the charging pile, and effectively improve the safety of the charger.
The above examples are provided for the purpose of illustrating the specific embodiments of the present invention, and it should be noted that it is possible for those skilled in the art to make several modifications and variations without departing from the spirit of the present invention, and these modifications and variations should be considered to be within the scope of the present invention.
Claims (7)
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| CN113635805B (en) * | 2021-09-14 | 2023-05-26 | 上汽通用五菱汽车股份有限公司 | Charging fault detection method, device and computer readable storage medium |
| CN114264971B (en) * | 2021-12-23 | 2023-09-15 | 深圳欣锐科技股份有限公司 | Signal detection circuit and vehicle-mounted charger |
| CN114526829A (en) * | 2022-02-15 | 2022-05-24 | 深圳威迈斯新能源股份有限公司 | Detection circuit capable of identifying charging mode and reporting temperature of corresponding charging port |
| CN115313545A (en) * | 2022-07-21 | 2022-11-08 | 平安智行科技有限公司 | Device for quickly converting charge and discharge |
| CN116092240A (en) * | 2022-12-30 | 2023-05-09 | 广东电网有限责任公司广州供电局 | Sharing system of alternating-current charging pile |
| DE102024202227A1 (en) * | 2024-03-11 | 2025-09-11 | Robert Bosch Gesellschaft mit beschränkter Haftung | Method for testing a CP line between a vehicle socket and a vehicle charge controller, computing unit, charging unit and vehicle |
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| CN108279373A (en) * | 2017-01-05 | 2018-07-13 | 宁德时代新能源科技股份有限公司 | Method and device for detecting charging switch of electric automobile |
| CN109774528A (en) * | 2018-12-25 | 2019-05-21 | 国网电力科学研究院有限公司 | Electric vehicle DC charging control guide circuit and control method |
| CN215793213U (en) * | 2021-06-21 | 2022-02-11 | 深圳威迈斯新能源股份有限公司 | CC/CP diagnostic circuit and charger |
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| CN109050329B (en) * | 2018-09-14 | 2020-08-04 | 北京新能源汽车股份有限公司 | Direct current charging control guide circuit, adaptive interface circuit and charging control method |
| CN109383312B (en) * | 2018-11-30 | 2020-11-24 | 北京新能源汽车股份有限公司 | Charging and discharging device |
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| CN108279373A (en) * | 2017-01-05 | 2018-07-13 | 宁德时代新能源科技股份有限公司 | Method and device for detecting charging switch of electric automobile |
| CN109774528A (en) * | 2018-12-25 | 2019-05-21 | 国网电力科学研究院有限公司 | Electric vehicle DC charging control guide circuit and control method |
| CN215793213U (en) * | 2021-06-21 | 2022-02-11 | 深圳威迈斯新能源股份有限公司 | CC/CP diagnostic circuit and charger |
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