Method for compatible identification of American-standard charging gun by CC sampling circuit
By designing a CC sampling circuit that compatiblely identifies the charging gun of the US standard, the problem that the charging machine of the new energy vehicle cannot recognize the charging gun of the US standard is solved, and compatible identification of the national standard and the charging gun of the US standard is achieved to ensure the normal progress of the charging process.
Patent Information
- Application Number
- CN202311257976.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-27
- Publication Date
- 2025-03-28
AI Technical Summary
The existing new energy vehicle charger cannot recognize the charging gun of the US standard, resulting in the inability to charge and cannot meet the requirements of the US standard.
A CC sampling circuit is designed, including a pull-up resistor circuit, a CC reference value sampling circuit and a detection point 3 voltage sampling circuit. The grounding resistance of the CC signal and PP signal is read through a microcontroller to achieve compatible identification of the national standard and the American standard charging gun.
The CC sampling circuit is realized to identify the CC signal of the national standard charging gun and the PP signal of the American standard charging gun, ensuring that the charger of the new energy vehicle can correctly judge the connection status of the charging interface and meet the requirements of the American standard.
Smart Images
Figure CN119716669A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of new energy vehicle charging, and in particular to a method for a CC sampling circuit to be compatible with and identify a charging gun of an American standard (hereinafter referred to as the American standard). Background Art
[0002] The CC sampling circuit inside the charger of new energy vehicles determines whether the charging gun is fully connected to the car by detecting the ground resistance value of the CC signal in the charging gun. The charger can charge the battery only after they are fully connected. For exported vehicles using American standard charging guns, the CC detection circuit inside the national standard charger needs to identify the ground resistance of the PP signal in the American standard charging gun and the American standard charging socket to determine whether they are fully connected. However, the PP signal ground resistance is different from the CC signal ground resistance, and the American standard provides requirements for the PP detection circuit. This results in the national standard charger being unable to recognize the American standard gun, unable to charge, and unable to meet the American standard.
[0003] Therefore, it is urgent to develop a CC sampling circuit that is compatible with and can identify American standard charging guns to solve the above problems. Summary of the invention
[0004] The purpose of the present invention is to provide a method for CC sampling circuit compatible identification of American standard charging guns.
[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is to design a method for designing a CC sampling circuit compatible with identifying American standard charging guns, including a pull-up resistor circuit (K0), a CC reference value sampling circuit (K1), and a detection point 3 voltage value sampling circuit (K2), characterized in that the CC sampling circuit can identify the CC signal of the national standard charging gun and the PP signal of the American standard charging gun.
[0006] The method for a CC sampling circuit to be compatible with and identify an American standard charging gun is characterized in that the pull-up resistor circuit (K0) is composed of a voltage regulator power supply (VDD), a pull-up resistor (R), a voltage regulator diode (D1), a filter capacitor 1 (C1), and a filter capacitor 2 (C2).
[0007] The method for identifying a CC sampling circuit compatible with an American standard charging gun is characterized in that the CC reference value sampling circuit (K1) includes a reference resistor (Ra) and a filter circuit 1 (K3).
[0008] The CC reference value sampling circuit (K1) is characterized in that the filter circuit 1 (K3) includes a filter resistor (R14), a filter diode (D2), and a filter capacitor 3 (C3).
[0009] The method for identifying a CC sampling circuit compatible with an American standard charging gun is characterized in that the detection point 3 voltage value sampling circuit (K2) includes a voltage dividing resistor (Rb) and a filter circuit 2 (K4).
[0010] The detection point 3 voltage value sampling circuit (K2) is characterized in that the filter circuit 2 (K4) includes a filter resistor (R14), a filter diode (D2), and a filter capacitor 3 (C3).
[0011] The method for identifying a CC sampling circuit compatible with an American standard charging gun is characterized in that the CC sampling circuit determines the connection status between the new energy vehicle charging interface and the charging gun by reading the CC signal grounding resistance and the PP signal grounding resistance voltage divider through a single-chip microcomputer. There are three connection states: not connected, half connected, and fully connected.
[0012] The method for a CC sampling circuit to be compatible with and identify an American standard charging gun is characterized in that when the national standard charging gun is not connected to the new energy vehicle charging interface, that is, the CC signal grounding resistor is not connected to the CC sampling circuit, when the switch S3 is closed, the resistance between the CC signal and the ground is infinite; when the national standard charging gun is half-connected to the new energy vehicle charging interface, that is, the CC signal grounding resistor is connected to the CC sampling circuit, when the switch S3 is disconnected, the resistance between the CC signal and the ground is R4+RC; when the national standard charging gun is fully connected to the new energy vehicle charging interface, that is, the CC signal grounding resistor is connected to the CC sampling circuit, when the switch S3 is closed, the resistance between the CC signal and the ground is RC.
[0013] The method for identifying the compatibility of a CC sampling circuit with an American standard charging gun is characterized in that when the American standard charging gun is not connected to the charging interface of a new energy vehicle, that is, the PP signal grounding resistor is not connected to the CC sampling circuit, when the switch S3 is closed, the resistance between the PP signal and the ground is infinite; when the American standard charging gun is semi-connected to the charging interface of a new energy vehicle, that is, the PP signal grounding resistor is not connected to the CC sampling circuit, when the switch S3 is disconnected, the resistance between the CC signal and the ground is When the American standard charging gun is fully connected to the new energy vehicle charging interface, that is, the PP signal grounding resistor is connected to the CC sampling circuit, and the switch S3 is closed, the resistance between the PP signal and the ground is
[0014] When the CC signal grounding resistor and the PP signal grounding resistor are connected to the CC sampling circuit, the single chip will collect the reference voltage value of the regulated power supply (CC REF AD) through the CC reference value sampling circuit (K1), and collect the CC grounding resistance and the PP signal grounding resistance voltage divider value (CC AD) through the detection point 3 voltage value sampling circuit (K2). Then, the program in the single chip will compare the reference voltage value of the regulated power supply (CC REF AD) and the grounding resistance voltage divider value (CC AD) to identify the connection status of the national standard charging gun, the American standard charging gun and the new energy vehicle charging interface.
[0015] The present invention is described in detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is the CC sampling circuit diagram of the present invention.
[0017] Figure 2 It is a CC sampling circuit connection diagram after the present invention is adapted to the national standard charging gun.
[0018] Figure 3 It is a CC sampling circuit connection diagram of the present invention adapted to the American standard charging gun and charging socket.
[0019] In the figure: K0 represents the pull-up resistor circuit, K1 represents the CC reference value sampling circuit, K2 represents the detection point 3 voltage value sampling circuit, K3 represents the filter circuit 1, K4 represents the filter circuit 2, D1 represents the voltage zener diode, D2 represents the filter diode, C1 represents the filter capacitor 1, C2 represents the filter capacitor 2, C3 represents the filter capacitor 3, R represents the pull-up resistor, Ra represents the reference resistor, Rb represents the voltage dividing resistor, R14 represents the filter resistor, VDD represents the voltage stabilizing power supply, CC REF AD represents the voltage stabilizing power supply reference voltage value, and CCAD represents the grounding resistor voltage dividing value. DETAILED DESCRIPTION
[0020] The technical solution adopted by the present invention is to design a method for designing a CC sampling circuit compatible with and identifying an American standard charging gun, comprising a pull-up resistor circuit (K0), a CC reference value sampling circuit (K1), and a detection point 3 voltage value sampling circuit (K2), wherein the CC sampling circuit can identify the CC signal of a national standard charging gun and can also identify the PP signal of an American standard charging gun.
[0021] The method for a CC sampling circuit to be compatible with and identify an American standard charging gun is characterized in that the pull-up resistor circuit (K0) is composed of a voltage regulator power supply (VDD), a pull-up resistor (R), a voltage regulator diode (D1), a filter capacitor 1 (C1), and a filter capacitor 2 (C2).
[0022] The method for identifying a CC sampling circuit compatible with an American standard charging gun is characterized in that the CC reference value sampling circuit (K1) includes a reference resistor (Ra) and a filter circuit 1 (K3).
[0023] The CC reference value sampling circuit (K1) is characterized in that the filter circuit 1 (K3) includes a filter resistor (R14), a filter diode (D2), and a filter capacitor 3 (C3).
[0024] The method for identifying a CC sampling circuit compatible with an American standard charging gun is characterized in that the detection point 3 voltage value sampling circuit (K2) includes a voltage dividing resistor (Rb) and a filter circuit 2 (K4).
[0025] The detection point 3 voltage value sampling circuit (K2) is characterized in that the filter circuit 2 (K4) includes a filter resistor (R14), a filter diode (D2), and a filter capacitor 3 (C3).
[0026] like Figure 1 , where the DC regulated power supply (VDD) in the pull-up resistor circuit (K0) is +5V, and the pull-up resistor R is 330Ω, which can meet both the national standard and the American standard; the CC reference value sampling circuit (K1) collects the reference voltage at the detection point 1 to determine the stability of the DC regulated power supply (VDD); the detection point 3 sampling circuit (K2) can detect the CC sampling voltage value at 3 to determine the size of the PP signal grounding resistance and CC signal grounding resistance connected to the back end of the CC sampling circuit.
[0027] The above-mentioned CC reference value sampling circuit (K1) and detection point 3 sampling circuit (K2) both have a filter circuit 1 (K3) which uses an RC first-order filter resistor for filtering to reduce the influence of interference signals on the sampling value, thereby improving the accuracy of the sampling value.
[0028] The method for identifying a CC sampling circuit compatible with an American standard charging gun is characterized in that the CC sampling circuit determines the connection status between the new energy vehicle charging interface and the charging gun by reading the CC signal grounding resistance and the PP signal grounding resistance voltage divider through a single-chip microcomputer. There are three connection states: not connected, half connected, and fully connected.
[0029] like Figure 2As shown, when the national standard charging gun and the new energy vehicle charging interface are not connected, that is, the CC signal grounding resistor is not connected to the CC sampling circuit, when the switch S3 is closed, the resistance between the CC signal and the ground is infinite; when the national standard charging gun and the new energy vehicle charging interface are half-connected, that is, the CC signal grounding resistor is connected to the CC sampling circuit, when the switch S3 is disconnected, the resistance between the CC signal and the ground is R4+RC; when the national standard charging gun and the new energy vehicle charging interface are fully connected, that is, the CC signal grounding resistor is connected to the CC sampling circuit, when the switch S3 is closed, the resistance between the CC signal and the ground is RC.
[0030] like Figure 3 As shown, when the American standard charging gun is not connected to the new energy vehicle charging interface, that is, the PP signal grounding resistor is not connected to the CC sampling circuit, when the switch S3 is closed, the resistance between the PP signal and the ground is infinite; when the American standard charging gun is half-connected to the new energy vehicle charging interface, that is, the PP signal grounding resistor is not connected to the CC sampling circuit, when the switch S3 is disconnected, the resistance between the CC signal and the ground is When the American standard charging gun is fully connected to the new energy vehicle charging interface, that is, the PP signal grounding resistor is connected to the CC sampling circuit, and the switch S3 is closed, the resistance between the PP signal and the ground is
[0031] In summary, after the CC signal grounding resistor and the PP signal grounding resistor are connected to the CC sampling circuit, the single chip will collect the reference voltage value (CC REF AD) of the regulated power supply through the CC reference value sampling circuit (K1) and the filter circuit 1 (K3), and collect the CC grounding resistance and the PP signal grounding resistance voltage divider value (CC AD) through the detection point 3 voltage value sampling circuit (K2) and the filter circuit 2 (K4). Then, the program in the single chip compares the reference voltage value (CC REF AD) of the regulated power supply and the grounding resistance voltage divider value (CC AD) to identify the connection status of the national standard charging gun, the American standard charging gun and the new energy vehicle charging interface. In this way, the national standard charger using this CC sampling circuit can identify the connection status of the national standard charging gun and the new energy vehicle charging interface, and can also identify the connection status of the American standard charging gun and the new energy vehicle charging interface.
[0032] Although the present invention is described above and provides specific implementation circuits, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to these implementation circuits without departing from the principles and essence of the present invention. Therefore, the protection scope of the present invention is limited by the attached claims.
Claims
1. A method for CC sampling circuit compatible with and identifying American standard charging guns, comprising a pull-up resistor circuit (K0), a CC reference value sampling circuit (K1), and a detection point 3 voltage value sampling circuit (K2), characterized in that: The CC sampling circuit can identify the CC signal of the national standard charging gun and the PP signal of the American standard charging gun.
2. A method for CC sampling circuit compatibility identification of American standard charging guns as claimed in claim 1, characterized in that: The pull-up resistor circuit (K0) is composed of a voltage-stabilized power supply (VDD), a pull-up resistor (R), a voltage-stabilizing diode (D1), a filter capacitor 1 (C1), and a filter capacitor 2 (C2).
3. A method for CC sampling circuit compatibility identification of American standard charging guns as claimed in claim 1, characterized in that: The CC reference value sampling circuit (K1) comprises a reference resistor (Ra) and a filter circuit 1 (K3).
4. The filter circuit 1 (K3) includes a filter resistor (R14), a filter diode (D2), and a filter capacitor 3 (C3).
5. A method for CC sampling circuit compatibility identification of American standard charging guns as claimed in claim 1, characterized in that: The voltage value sampling circuit (K2) of the detection point 3 includes a voltage dividing resistor (Rb) and a filter circuit 2 (K4).
6. The detection point 3 voltage value sampling circuit (K2) as claimed in claim 5, characterized in that: The filtering circuit 2 (K4) includes a filtering resistor (R14), a filtering diode (D2), and a filtering capacitor 3 (C3).