A DC fast charging guidance circuit and vehicle controller

Abstract

The present application discloses a DC fast-charging guidance circuit, including a single-chip microcomputer and an auxiliary power supply detection circuit, a CC1 signal detection circuit, and a CC2 signal detection circuit, all of which are connected to the single-chip microcomputer. The other end of the auxiliary power supply detection circuit is also connected to an input signal absorption filter circuit, and the CC2 signal detection circuit also includes a boost circuit; the single-chip microcomputer is used to receive signals provided by the auxiliary power supply detection circuit, the CC1 signal detection circuit, and the CC2 signal detection circuit, and when the level voltage of the auxiliary power supply is within the standard range, the auxiliary power supply is fully connected to the AUX port, the voltage at the first detection point is within the standard range, and the voltage at the second detection point is within the standard range, a charging operation is performed. The present application also discloses a vehicle controller, including the above-mentioned DC fast-charging guidance circuit, the circuit and the vehicle controller have stronger charging stability and reliability, faster response speed, and save time for information interaction.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle charging equipment, and in particular relates to a direct current fast charging guidance circuit and a vehicle controller. Background Art

[0002] With the development of science and technology and the change of national policies, electric vehicles have become an indispensable part of industrial production and daily life. As the core power source of electric vehicles, the vehicle controller that carries the charging task faces successive challenges. The energy density of power batteries has always been the key to restricting the development of electric vehicles, but the problem of charging time has also constantly challenged consumers' psychological tolerance. AC slow charging is essential for power battery charging, but DC fast charging, which can reduce charging time, alleviates the endurance troubles of electric vehicles replacing fuel vehicles.

[0003] It should be noted that the characteristics of DC fast charging are short charging time, high power, and rapid temperature change, but stability, reliability, and response time are factors that must be considered, and the control strategies in the current national standards are as follows: Figure 1 As shown, Figure 1 This is a schematic diagram of the control strategy of DC fast charging in the prior art. This DC charging control pilot circuit has three parts: off-board charger, vehicle interface and electric vehicle. When the vehicle plug is plugged into the vehicle socket, the vehicle will enter a non-driving state through its own logic control interlock or other means. The off-board controller detects the CC1 voltage (i.e. Figure 1 The voltage of detection point 1 in the middle) is within the standard range to confirm that the vehicle interface is fully connected, close K3 and K4 to turn on the auxiliary power supply, close K1 and K2 for self-test, and after completion, disconnect K1 and K2 and the off-board charging controller starts to send communication handshake messages periodically. After the vehicle controller receives the auxiliary power supply, it detects the CC2 voltage (i.e. Figure 1 The voltage at detection point 2 in the CAN bus is within the standard range, confirming that the vehicle interface is fully connected, and the vehicle controller starts to periodically send communication handshake messages. The CAN communication handshake is successful, and the vehicle controller sends the battery charging requirement parameters in real time during the charging phase. It can be seen that in this solution, the non-vehicle controller detects the CC1 signal to confirm the voltage at detection point 1 and determines whether to send a communication handshake signal. Then, the vehicle controller detects the CC2 signal to confirm the voltage at detection point 2 and determines whether to send a communication handshake signal. During the charging process after the handshake is successful, CAN communication S+ and S- interact with each other in real time.

[0004] However, since the voltage at CC1 detection point 1 is detected by a non-vehicle controller and the voltage at CC2 detection point 2 is detected by a vehicle controller, it is necessary to exchange status information through CAN communication after the detection. This interaction takes time. Therefore, it cannot meet the timely response to faults. Moreover, this interaction method is relatively simple, so the reliability and stability are insufficient. Therefore, the existing solution is far from meeting the high stability requirements brought about by the increasingly compressed charging time. Summary of the invention

[0005] To solve the above problems, the present invention provides a DC fast charging guidance circuit and a vehicle controller, which have stronger charging stability and reliability, faster response speed, and save time for information interaction.

[0006] A DC fast charging pilot circuit provided by the present invention includes a single-chip microcomputer and an auxiliary power supply detection circuit, a CC1 signal detection circuit, and a CC2 signal detection circuit all connected to the single-chip microcomputer. The other end of the auxiliary power supply detection circuit is also connected to an input signal absorption filter circuit, and the CC2 signal detection circuit also includes a boost circuit;

[0007] The input signal absorption filter circuit is used to absorb the instantaneous pulse and clutter signal at the moment of connection or disconnection;

[0008] The auxiliary power supply detection circuit is connected to the single-chip microcomputer through the auxiliary power supply voltage detection port and the auxiliary power supply negative voltage connection detection port, and the other end of the input signal absorption filter circuit is connected to the auxiliary power supply through the AUX+ port and the AUX- port, and is used to detect the level voltage of the auxiliary power supply and confirm whether the positive and negative ports of the auxiliary power supply are both in the connected state;

[0009] The CC1 signal detection circuit is connected to the single-chip microcomputer via the CC1 voltage detection port and the port resistance detection control pin, and is used to detect the resistance of the charging socket to ground and the voltage of the first detection point, where the first detection point is a voltage detection point of the off-board charging controller, and the other end is connected to the external CC1 signal detection port;

[0010] The CC2 signal detection circuit is connected to the single-chip microcomputer via a sleep detection enable port and a CC2 voltage detection port, and is used to detect the voltage of a second detection point, which is a vehicle controller voltage detection point, and the other end is connected to an external CC2 signal detection port;

[0011] The boost circuit is used to provide a stable pull-up power supply for the CC2 signal detection circuit;

[0012] The single chip microcomputer is used to receive signals provided by the auxiliary power detection circuit, the CC1 signal detection circuit and the CC2 signal detection circuit, and performs a charging operation when the level voltage of the auxiliary power supply is within a standard range, the auxiliary power supply is fully connected to the AUX-port, the voltage of the first detection point is within a standard range, and the voltage of the second detection point is within a standard range.

[0013] Preferably, in the above-mentioned DC fast charging guidance circuit, the auxiliary power supply detection circuit includes capacitor C1, capacitor C2, resistor R1, resistor R2, resistor R3, resistor R4, transistor T1 and a first power supply 3V3, the first end of capacitor C1, the first end of resistor R1 and the first end of resistor R2 are connected to the auxiliary power supply voltage detection port of the single-chip computer; the second end of resistor R2 and the first end of resistor R4 are connected to the AUX+ port through the input signal absorption filter circuit; the second end of resistor R4 and the base of transistor T1 are connected to the AUX- port through the input signal absorption filter circuit; the collector of transistor T1, the first end of resistor R3, and the first end of capacitor C2 are connected to the auxiliary power supply negative voltage connection detection port; the second end of resistor R3 is connected to the first power supply 3V3; the second end of capacitor C1, the second end of capacitor C2, the second end of resistor R1 and the emitter of transistor T1 are grounded.

[0014] Preferably, in the above-mentioned DC fast charging guidance circuit, the input signal absorption filter circuit includes a TVS tube D1, a TVS tube D2, a capacitor C3 and a capacitor C4, the first end of the TVS tube D1 and the first end of the capacitor C3 are connected to the AUX+ port, and the second end of the TVS tube D1 and the second end of the capacitor C3 are grounded; the first end of the TVS tube D2 and the first end of the capacitor C4 are connected to the AUX- port, and the second end of the TVS tube D2 and the second end of the capacitor C4 are grounded.

[0015] Preferably, in the above-mentioned DC fast charging guidance circuit, the CC1 signal detection circuit includes capacitor C5, resistor R5, resistor R6, resistor R7, diode D3, transistor T2, transistor T3 and a second power supply 12V, the first end of capacitor C5, the first end of resistor R5 and the first end of resistor R6 are connected to the port resistance detection control pin of the single-chip microcomputer; the second end of resistor R6 and the cathode of diode D3 are connected to the CC1 signal detection port; the first end of resistor R7 and the anode of diode D3 are connected; the collector of transistor T3 and the second end of resistor R7 are connected; the emitter of transistor T3 is connected to the second power supply 12V; the collector of transistor T2 and the base of transistor T3 are connected; the base of transistor T2 is connected to the port resistance detection control pin; the second end of capacitor C5, the second end of resistor R5 and the emitter of transistor T2 are grounded.

[0016] Preferably, in the above-mentioned DC fast charging pilot circuit, the CC2 signal detection circuit includes a capacitor C6, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a diode D4, a diode D5, a transistor T4, a transistor T5, a second power supply 12V and a fourth power supply 12V_Boost; the first end of the capacitor C6, the first end of the resistor R8 and the first end of the resistor R9 are connected to the CC2 voltage detection port; the second end of the resistor R9, the cathode of the diode D4 and the cathode of the diode D5 are connected to the CC2 signal detection port ; The first end of the resistor R10 is connected to the fourth power supply 12V_Boost; the second end of the resistor R10 is connected to the anode of the diode D4; the anode of the diode D5 is connected to the first end of the resistor R11; the second end of the resistor R11 is connected to the collector of the transistor T5; the emitter of the transistor T5 is connected to the second power supply 12V; the base of the transistor T5 is connected to the collector of the transistor T4; the base of the transistor T4 is connected to the port resistance detection control pin; the second end of the capacitor C6, the second end of the resistor R8 and the emitter of the transistor T4 are grounded.

[0017] Preferably, in the above-mentioned DC fast charging steering circuit, the boost circuit includes a third power supply 5V0 and a fourth power supply 12V_Boost, and the third power supply 5V0 is boosted by a boost module to generate the fourth power supply 12V_Boost.

[0018] A vehicle controller provided by the present invention includes a vehicle controller body and also includes a DC fast charging guidance circuit as described in any one of the above items.

[0019] From the above description, it can be known that the above-mentioned DC fast charging guidance circuit provided by the present invention includes a single-chip microcomputer and an auxiliary power supply detection circuit, a CC1 signal detection circuit, and a CC2 signal detection circuit all connected to the single-chip microcomputer. The other end of the auxiliary power supply detection circuit is also connected to an input signal absorption filter circuit, and the CC2 signal detection circuit also includes a boost circuit; the single-chip microcomputer is used to receive the signals provided by the auxiliary power supply detection circuit, the CC1 signal detection circuit, and the CC2 signal detection circuit, and when the level voltage of the auxiliary power supply is within the standard range, the auxiliary power supply is fully connected to the AUX-port, the voltage of the first detection point is within the standard range, and the voltage of the second detection point is within the standard range. When the voltage is within the standard range, the charging operation is performed. It can be seen that the single-chip microcomputer is used in this scheme to simultaneously detect the voltages of CC1 and CC2 and monitor them in real time. There is no need for CAN transmission like the prior art. In addition, the auxiliary power supply detection circuit is connected to the single-chip microcomputer through the auxiliary power supply voltage detection port and the auxiliary power supply negative voltage connection detection port. The other end of the input signal absorption filter circuit is connected to the auxiliary power supply through the AUX+ port and the AUX- port, which is used to detect the level voltage of the auxiliary power supply and confirm whether the positive and negative ports of the auxiliary power supply are both in the on state, adding one way of judgment for the complete connection of the socket. Therefore, the circuit has stronger charging stability and reliability, faster response speed, and saves time for information interaction. The vehicle controller provided by the present invention, because it includes the above-mentioned DC fast charging guidance circuit, also has better charging stability and reliability, faster response speed, and saves time for information interaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the control strategy of DC fast charging in the prior art;

[0022] Figure 2 A schematic diagram of a DC fast charging guidance circuit provided in this application;

[0023] Figure 3 A detailed connection diagram of the DC fast charging pilot circuit. DETAILED DESCRIPTION

[0024] The core of the present invention is to provide a DC fast charging guidance circuit and a vehicle controller, which have stronger charging stability and reliability, faster response speed, and save time for information interaction.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present application provides a DC fast charging pilot circuit implementation example Figure 2 As shown, Figure 2 A schematic diagram of a DC fast charging pilot circuit provided in the present application, the DC fast charging pilot circuit includes a single chip microcomputer 1 and an auxiliary power supply detection circuit 2, a CC1 signal detection circuit 3, and a CC2 signal detection circuit 4, all of which are connected to the single chip microcomputer 1. The other end of the auxiliary power supply detection circuit 2 is also connected to an input signal absorption filter circuit 5, and the CC2 signal detection circuit 4 also includes a boost circuit 6;

[0027] The input signal absorption filter circuit 5 is used to absorb the instantaneous pulse and noise signal at the moment of connection or disconnection;

[0028] The auxiliary power supply detection circuit 2 is connected to the single-chip computer 1 through the auxiliary power supply voltage detection port and the auxiliary power supply negative voltage connection detection port, and the other end of the input signal absorption filter circuit 5 is connected to the auxiliary power supply 7 through the AUX+ port and the AUX- port, for detecting the level voltage of the auxiliary power supply 7 and confirming whether the positive and negative ports of the auxiliary power supply are both in the connected state;

[0029] The CC1 signal detection circuit 3 is connected to the single chip computer 1 through the CC1 voltage detection port and the port resistance detection control pin, and is used to detect the resistance of the charging socket to the ground and the voltage of the first detection point. The first detection point is the voltage detection point of the non-vehicle charging controller, that is, Figure 1 The detection point 1 is shown in the figure, and the other end is connected to the external CC1 signal detection port;

[0030] The CC2 signal detection circuit 4 is connected to the single chip microcomputer through the sleep detection enable port and the CC2 voltage detection port, and is used to detect the voltage of the second detection point, which is the vehicle controller voltage detection point. Figure 1 The detection point 2 is shown in the figure, and the other end is connected to the external CC2 signal detection port;

[0031] The boost circuit 6 is used to provide a stable pull-up power supply for the CC2 signal detection circuit 4;

[0032] The single chip computer 1 is used to receive signals provided by the auxiliary power detection circuit 2, the CC1 signal detection circuit 3 and the CC2 signal detection circuit 4, and performs a charging operation when the level voltage of the auxiliary power supply 7 is within the standard range, the auxiliary power supply 7 is fully connected to the AUX-port, the voltage of the first detection point is within the standard range, and the voltage of the second detection point is within the standard range.

[0033] From the above description, it can be known that in the embodiment of the above-mentioned DC fast charging guidance circuit provided by the present application, since it includes a single-chip microcomputer and an auxiliary power supply detection circuit, a CC1 signal detection circuit, and a CC2 signal detection circuit all connected to the single-chip microcomputer, the other end of the auxiliary power supply detection circuit is also connected to an input signal absorption filter circuit, and the CC2 signal detection circuit also includes a boost circuit; the single-chip microcomputer is used to receive the signals provided by the auxiliary power supply detection circuit, the CC1 signal detection circuit, and the CC2 signal detection circuit, and when the level voltage of the auxiliary power supply is within the standard range, the auxiliary power supply is fully connected to the AUX-port, the voltage at the first detection point is within the standard range, and the voltage at the second detection point is within the standard range. When it is within the range, the charging operation is performed. It can be seen that the single-chip microcomputer is used in this scheme to simultaneously detect the voltages of CC1 and CC2 and monitor them in real time. There is no need for CAN transmission like the prior art, and the auxiliary power supply detection circuit is connected to the single-chip microcomputer through the auxiliary power supply voltage detection port and the auxiliary power supply negative voltage connection detection port. The other end of the input signal absorption filter circuit is connected to the auxiliary power supply through the AUX+ port and the AUX- port, which is used to detect the level voltage of the auxiliary power supply and confirm whether the positive and negative ports of the auxiliary power supply are both in the on state, which adds one way of judgment for the complete connection of the socket. Therefore, the circuit has stronger charging stability and reliability, faster response speed, and saves time for information interaction.

[0034] In a specific embodiment of the DC fast charging pilot circuit, Figure 3 As shown, Figure 3It is a detailed connection diagram of the DC fast charging guidance circuit. It can be seen that the auxiliary power supply detection circuit 301 includes a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a transistor T1 and a first power supply 3V3. The first end of the capacitor C1, the first end of the resistor R1 and the first end of the resistor R2 are connected to the auxiliary power supply voltage detection port of the single-chip microcomputer; the second end of the resistor R2 and the first end of the resistor R4 are connected to the AUX+ port through the input signal absorption filter circuit; the second end of the resistor R4 and the base of the transistor T1 are connected to the AUX- port through the input signal absorption filter circuit; the collector of the transistor T1, the first end of the resistor R3, the capacitor The first end of C2 is connected to the auxiliary power supply negative voltage connection detection port; the second end of the resistor R3 is connected to the first power supply 3V3; the second end of the capacitor C1, the second end of the capacitor C2, the second end of the resistor R1 and the emitter of the transistor T1 are grounded, and the input signal absorption filter circuits 302 and 303 include TVS tube D1, TVS tube D2, capacitor C3 and capacitor C4, the first end of the TVS tube D1 and the first end of the capacitor C3 are connected to the AUX+ port, and the second end of the TVS tube D1 and the second end of the capacitor C3 are grounded; the first end of the TVS tube D2 and the first end of the capacitor C4 are connected to the AUX- port, and the second end of the TVS tube D2 and the second end of the capacitor C4 are grounded.

[0035] It should be noted that the auxiliary power supply is provided by an external non-vehicle charger, and the vehicle charger has the right to choose to use it. Here, the auxiliary power supply voltage and the auxiliary power supply negative pressure connection detection port level will be collected through hardware detection to confirm whether the auxiliary power supply is fully connected. When the auxiliary power supply voltage detection port detects that the voltage is within the normal range, and the auxiliary power supply negative pressure connection detection port is high, the auxiliary power supply AUX+ port and AUX- port are fully connected, meeting the charging requirements; when the auxiliary power supply voltage detection port detects that the voltage is within the normal range, the auxiliary power supply negative pressure connection detection port is low, and the auxiliary power supply AUX- port is not normally connected and the state is abnormal; when the auxiliary power supply voltage detection port detects that the voltage is 0, the auxiliary power supply negative pressure connection detection port is high, and the auxiliary power supply is not connected; when the auxiliary power supply voltage detection port voltage is 0, and the auxiliary power supply negative pressure connection detection port is low, the auxiliary power supply AUX+ has no voltage, AUX- is connected, and the state is abnormal. The auxiliary power supply detection circuit can detect the auxiliary power supply voltage and connection status. On the one hand, it can be used as a detection of the vehicle charger using an external auxiliary power supply, and on the other hand, it can be used as a detection of the connection status between the charging gun and the charging socket. The information and connection status of the auxiliary power supply are determined by hardware detection, which improves the response time and further increases reliability compared to the CAN communication interaction status information.

[0036] When the AUX+ port and AUX- port signals of the auxiliary power supply are connected and disconnected, instantaneous pulses and / or noise signals will be generated. The input signal absorption and filtering circuit here can absorb the instantaneous pulses and / or noise signals generated when the auxiliary power supply is connected or disconnected, avoid external interference, and ensure the stability of the auxiliary power supply and the accuracy of the detection signal. For example, when the charging gun is externally powered, the auxiliary power supply has power, and there will be large fluctuations at the moment of plugging and unplugging, affecting the stability.

[0037] In another specific embodiment of the DC fast charging pilot circuit, continue to refer to Figure 3 The CC1 signal detection circuit 304 may specifically include a capacitor C5, a resistor R5, a resistor R6, a resistor R7, a diode D3, a transistor T2, a transistor T3 and a second power supply 12V, a first end of the capacitor C5, a first end of the resistor R5 and a first end of the resistor R6 are connected to the port resistance detection control pin of the single chip microcomputer; a second end of the resistor R6 and a cathode of the diode D3 are connected to the CC1 signal detection port; a first end of the resistor R7 and an anode of the diode D3 are connected; a collector of the transistor T3 and a second end of the resistor R7 are connected; an emitter of the transistor T3 is connected to the second power supply 12V; a collector of the transistor T2 and a base of the transistor T3 are connected; a base of the transistor T2 is connected to the port resistance detection control pin; a second end of the capacitor C5, a second end of the resistor R5 and an emitter of the transistor T2 are grounded.

[0038] It should be noted that in this solution, the vehicle controller monitors CC1 while monitoring CC2, and adds reference information for confirming the status of PE line broken pin and CC1 broken pin and wire. Traditional vehicle controllers do not have CC1 detection. Here, the CC1 detection circuit of the vehicle controller is added. When the on-board charger is powered on, the signal of the MCU port resistance detection control pin is enabled to provide pull-up power to CC1 to detect Figure 1 Whether the resistance value of resistor R4 is well connected and meets the national standard requirements, the connection status with PE can be judged; when the charging gun is inserted, it can be judged by the priority contact detection of the CC2 signal, the enable signal of the port resistance detection control pin is turned off, and the CC1 voltage signal is detected simultaneously with the off-board charger. The microcontroller can obtain the CC1 signal voltage in real time; the voltage change of the CC1 signal in the sleep state will wake up the microcontroller system at any time to realize the scheduled charging function. Compare the CC1 voltage status of the off-board charger controller and the vehicle controller to confirm the connection status of CC1 and PE. Figure 1As shown, U1 = 12V, R1, R2, R4 are all 1K, when the detection voltage value is 4V, it means that CC1 and PE are fully connected; when the vehicle controller cannot detect the resistor R4, it means that the on-board charging socket is faulty, R4 does not exist, or there is no good contact with PE; when the vehicle controller detects that R4 is normal, the off-board charging controller can detect the switching of the voltage of 12V and 6V when the switch S is on, at this time the voltage of the detection point 1 (the first detection point) is 6V, and the CC2 signal voltage is not within the range, indicating that the PE pin is broken; when the on-board controller detects that R4 is normal, the off-board charger controller cannot detect the switching of the voltage of 12V and 6V when the switch S is on, which means that the PE is partially disconnected in the charging gun; when the vehicle controller detects that R4 is normal, but no voltage is detected after the connection, the off-board charger controller can detect the voltage change when the switch S is on, and the last voltage is 6V, indicating that CC1 is not fully connected. The CC1 detection circuit of this embodiment can obtain the CC1 voltage by hardware detection, which is faster than the response speed of the CAN communication transmission state.

[0039] In another specific embodiment of the DC fast charging pilot circuit, continue to refer to Figure 3 The CC2 signal detection circuit 305 may specifically include a capacitor C6, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a diode D4, a diode D5, a transistor T4, a transistor T5, a second power supply 12V and a fourth power supply 12V_Boost; a first end of the capacitor C6, a first end of the resistor R8 and a first end of the resistor R9 are connected to the CC2 voltage detection port; a second end of the resistor R9, a cathode of the diode D4 and a cathode of the diode D5 are connected to the CC2 signal detection port; the resistor R10 The first end of is connected to the fourth power supply 12V_Boost; the second end of the resistor R10 is connected to the anode of the diode D4; the anode of the diode D5 is connected to the first end of the resistor R11; the second end of the resistor R11 is connected to the collector of the transistor T5; the emitter of the transistor T5 is connected to the second power supply 12V; the base of the transistor T5 is connected to the collector of the transistor T4; the base of the transistor T4 is connected to the port resistance detection control pin; the second end of the capacitor C6, the second end of the resistor R8 and the emitter of the transistor T4 are grounded.

[0040] It should be noted that this CC2 signal detection circuit can enable the single-chip microcomputer to obtain CC2 voltage in real time. It is controlled by the switch circuit signal. The circuit is simple and easy to implement. The second power supply 12V is the power supply of the automobile system. The change range is not conducive to determining the connection status through the CC2 voltage range. At this time, it is necessary to provide a stable pull-up power supply to the CC2 signal detection circuit in accordance with the national standard. When the vehicle controller is in normal working state, the single-chip microcomputer will not enable the "sleep detection enable port", and the fourth power supply 12V_Boost will perform the pull-up power supply function. When the vehicle controller is in the sleep state, the single-chip microcomputer will enable the "sleep detection enable port", and the second power supply 12V will perform the pull-up power supply function. When the CC2 signal voltage changes, it will wake up the single-chip microcomputer system at any time to realize the scheduled charging function.

[0041] The CC2 signal detection circuit of this embodiment can obtain the CC2 voltage by hardware detection and transmit it to the off-board charger controller through CAN communication in a timely manner, with faster response speed and higher reliability. Of course, this is an optional solution, and other types of circuits can be selected according to actual needs, which is not limited here.

[0042] In a preferred embodiment of the above DC fast charging pilot circuit, continue to refer to Figure 3 The boost circuit 306 may specifically include a third power source 5V0 and a fourth power source 12V_Boost, and the third power source 5V0 is boosted by a boost module to generate a fourth power source 12V_Boost.

[0043] It should be noted that the third power supply 5V0 does not exist in the sleep state, enabling the "sleep detection enable port" of the CC2 signal detection circuit to meet the requirement of single pull-up power supply stability of the CC2 signal detection circuit.

[0044] The auxiliary power supply voltage detection is within the standard range; the auxiliary power supply AUX- is fully connected; the CC1 signal detection voltage is within the standard range; the CC2 signal detection voltage is within the standard range. Only when these four conditions are met and the software CAN communication message comparison is passed, can the charging operation be performed.

[0045] In an embodiment of a vehicle controller provided in the present application, it includes a vehicle controller body and also includes a DC fast charging guidance circuit as any of the above items. Therefore, it also has better charging stability and reliability, faster response speed, and saves time for information interaction.

[0046] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC fast charging pilot circuit, characterized in that: It includes a single-chip microcomputer and an auxiliary power detection circuit, a CC1 signal detection circuit, and a CC2 signal detection circuit, all of which are connected to the single-chip microcomputer. The other end of the auxiliary power detection circuit is also connected to an input signal absorption filter circuit, and the CC2 signal detection circuit also includes a boost circuit; The input signal absorption filter circuit is used to absorb the instantaneous pulse and clutter signal at the moment of connection or disconnection; The auxiliary power supply detection circuit is connected to the single-chip microcomputer through the auxiliary power supply voltage detection port and the auxiliary power supply negative voltage connection detection port, and the other end of the input signal absorption filter circuit is connected to the auxiliary power supply through the AUX+ port and the AUX- port, and is used to detect the level voltage of the auxiliary power supply and confirm whether the positive and negative ports of the auxiliary power supply are both in the connected state; The CC1 signal detection circuit is connected to the single-chip microcomputer via the CC1 voltage detection port and the port resistance detection control pin, and is used to detect the resistance of the charging socket to ground and the voltage of the first detection point, where the first detection point is a voltage detection point of the off-board charging controller, and the other end is connected to the external CC1 signal detection port; The CC2 signal detection circuit is connected to the single-chip microcomputer via a sleep detection enable port and a CC2 voltage detection port, and is used to detect the voltage of a second detection point, which is a vehicle controller voltage detection point, and the other end is connected to an external CC2 signal detection port; The boost circuit is used to provide a stable pull-up power supply for the CC2 signal detection circuit; The single chip microcomputer is used to receive signals provided by the auxiliary power detection circuit, the CC1 signal detection circuit and the CC2 signal detection circuit, and perform a charging operation when the level voltage of the auxiliary power is within a standard range, the auxiliary power is fully connected to the AUX-port, the voltage of the first detection point is within a standard range, and the voltage of the second detection point is within a standard range; The auxiliary power supply detection circuit includes a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a transistor T1 and a first power supply 3V3, wherein the first end of the capacitor C1, the first end of the resistor R1 and the first end of the resistor R2 are connected to the auxiliary power supply voltage detection port of the single chip microcomputer; the second end of the resistor R2 and the first end of the resistor R4 are connected to the AUX+ port through the input signal absorption filter circuit; the second end of the resistor R4 and the base of the transistor T1 are connected to the AUX- port through the input signal absorption filter circuit; the collector of the transistor T1, the first end of the resistor R3 and the first end of the capacitor C2 are connected to the auxiliary power supply negative voltage connection detection port; the second end of the resistor R3 is connected to the first power supply 3V3; the second end of the capacitor C1, the second end of the capacitor C2, the second end of the resistor R1 and the emitter of the transistor T1 are grounded; The input signal absorption filter circuit includes a TVS tube D1, a TVS tube D2, a capacitor C3 and a capacitor C4, a first end of the TVS tube D1 and a first end of the capacitor C3 are connected to the AUX+ port, and a second end of the TVS tube D1 and a second end of the capacitor C3 are grounded; a first end of the TVS tube D2 and a first end of the capacitor C4 are connected to the AUX- port, and a second end of the TVS tube D2 and a second end of the capacitor C4 are grounded.

2. The DC fast charging guiding circuit according to claim 1, characterized in that: The CC1 signal detection circuit includes a capacitor C5, a resistor R5, a resistor R6, a resistor R7, a diode D3, a transistor T2, a transistor T3 and a second power supply 12V. The first end of the capacitor C5, the first end of the resistor R5 and the first end of the resistor R6 are connected to the port resistance detection control pin of the single-chip computer; the second end of the resistor R6 and the cathode of the diode D3 are connected to the CC1 signal detection port; the first end of the resistor R7 and the anode of the diode D3 are connected; the collector of the transistor T3 and the second end of the resistor R7 are connected; the emitter of the transistor T3 is connected to the second power supply 12V; the collector of the transistor T2 and the base of the transistor T3 are connected; the base of the transistor T2 is connected to the port resistance detection control pin; the second end of the capacitor C5, the second end of the resistor R5 and the emitter of the transistor T2 are grounded.

3. The DC fast charging guiding circuit according to claim 1, characterized in that: The CC2 signal detection circuit includes a capacitor C6, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a diode D4, a diode D5, a transistor T4, a transistor T5, a second power supply 12V and a fourth power supply 12V_Boost; a first end of the capacitor C6, a first end of the resistor R8 and a first end of the resistor R9 are connected to the CC2 voltage detection port; a second end of the resistor R9, a cathode of the diode D4 and a cathode of the diode D5 are connected to the CC2 signal detection port; a first end of the resistor R10, a cathode of the diode D4 and a cathode of the diode D5 are connected to the CC2 signal detection port; a first end of the resistor R1 ... capacitor C6, a first end of the resistor R8 One end is connected to the fourth power supply 12V_Boost; the second end of the resistor R10 is connected to the anode of the diode D4; the anode of the diode D5 is connected to the first end of the resistor R11; the second end of the resistor R11 is connected to the collector of the transistor T5; the emitter of the transistor T5 is connected to the second power supply 12V; the base of the transistor T5 is connected to the collector of the transistor T4; the base of the transistor T4 is connected to the port resistance detection control pin; the second end of the capacitor C6, the second end of the resistor R8 and the emitter of the transistor T4 are grounded.

4. The DC fast charging guiding circuit according to claim 1, characterized in that: The boost circuit includes a third power source 5V0 and a fourth power source 12V_Boost. The third power source 5V0 is boosted by a boost module to generate the fourth power source 12V_Boost.

5. A vehicle controller, comprising a vehicle controller body, characterized in that: It also includes a DC fast charging guidance circuit as described in any one of claims 1-4.

Images