CC signal processing system

Abstract

A CC signal processing system is disclosed, belonging to the technical field of electric vehicles. The power supply end of the control module and the first end of the wake-up circuit are connected to the power supply; the wake-up end of the control module is connected to the second end of the wake-up circuit; the first control end of the control module is connected to the control end of the clamp circuit; the output end of the control module is respectively connected to the input end of the clamp circuit and the power supply end of the CC signal detection circuit, and the output end of the control module outputs a voltage signal of a first preset voltage value; the detection end of the control module is connected to the output end of the CC signal detection circuit; the third end of the wake-up circuit, the output end of the clamp circuit and the first input end of the CC signal detection circuit are all connected to the first access point of the charging interface, and the fourth end of the wake-up circuit and the second input end of the CC signal detection circuit are connected to the second access point of the charging interface. The present application can reliably determine whether the power output interface and the charging interface are connected.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a CC signal processing system. Background Art

[0002] With the development of electric vehicle technology, more and more electric vehicles have entered people's lives. Electric vehicles are mainly powered by power batteries, which are used to drive electric vehicles. Electric vehicles include OBC (On Board Charger). When using a charging gun to charge the power battery of an electric vehicle, after the charging gun is inserted into the charging port of the electric vehicle, the OBC converts the AC power input by the charging gun into DC power to charge the power battery. In this process, the CC (Connection Confirm) signal is often used to determine whether the charging gun is successfully inserted into the charging port of the electric vehicle.

[0003] In the related art, see Figure 1 The electric vehicle also includes a low-voltage battery 101, which is used to power the low-voltage part in the OBC. The low-voltage part in the OBC includes a CC signal detection circuit 102 and an MCU (Microcontroller Unit) 103. The CC signal detection circuit 102 includes a transistor Qa, a MOS (Metal-Oxide-Semiconductor) tube Qb and multiple resistors R. The charging gun 104 includes a resistor RC and a resistor R0. When the charging gun 104 is not inserted into the charging interface of the electric vehicle, the resistor RC and the resistor R0 are not connected to the CC signal detection circuit 102. At this time, the gate voltage of the MOS tube Qb is large, the MOS tube Qb is not turned on, the transistor Qa is not turned on, and the MCU103 does not detect the corresponding level from the collector of the transistor Qa, then it is determined that the charging gun 104 is not inserted into the charging interface. When the charging gun 104 is inserted into the charging interface, the resistors RC and R0 are connected to the CC signal detection circuit 102, causing the gate voltage of the MOS tube Qb to decrease, and the MOS tube Qb is turned on, and then the transistor Qa is also turned on. The MCU103 detects the corresponding level from the collector of the transistor Qa, and determines that the charging gun 104 is inserted into the charging interface.

[0004] However, when the low-voltage battery 101 supplies power to the low-voltage part of the OBC, since the low-voltage battery 101 is always outputting power, if the low-voltage battery 101 is not charged in time, the voltage of the low-voltage battery 101 will decrease. Once the voltage of the low-voltage battery 101 changes, the voltage of the emitter of the transistor Qa will change, which will then cause the level detected by the MCU 103 to change, which will cause the MCU 103 to be unable to reliably determine the connection status between the charging gun 104 and the charging interface. Summary of the invention

[0005] The present application provides a CC signal processing system, which can reliably determine whether the power output interface and the charging interface are connected. The technical solution is as follows:

[0006] In a first aspect, a CC signal processing system is provided, the system comprising a control module, a wake-up circuit, a connection confirmation CC signal detection circuit, and a clamping circuit;

[0007] The power supply end of the control module and the first end of the wake-up circuit are both used to connect to the power supply; the wake-up end of the control module is connected to the second end of the wake-up circuit; the first control end of the control module is connected to the control end of the clamp circuit to control the on or off of the clamp circuit; the output end of the control module is respectively connected to the input end of the clamp circuit and the power supply end of the CC signal detection circuit, and the output end of the control module is used to output a voltage signal of a first preset voltage value; the detection end of the control module is connected to the output end of the CC signal detection circuit;

[0008] The third end of the wake-up circuit, the output end of the clamping circuit and the first input end of the CC signal detection circuit are all connected to the first access point of the charging interface, the fourth end of the wake-up circuit and the second input end of the CC signal detection circuit are all connected to the second access point of the charging interface, and the first access point and the second access point of the charging interface are used to access the power output interface; when the power output interface is not connected to the charging interface, the second end of the wake-up circuit does not output a wake-up signal; when the power output interface is connected to the charging interface, the second end of the wake-up circuit outputs a wake-up signal to drive the control module to work.

[0009] In the present application, when the control module wakes up, due to the presence of the clamping circuit, it can ensure that the voltage value of the voltage signal at the input end of the CC signal detection circuit is not affected by the voltage change of the power supply, and it can also ensure that the level of the CC signal outputted from the output end of the CC signal detection circuit is not affected by the voltage change of the power supply. In this way, the control module can accurately determine whether the power output interface is connected to the charging interface.

[0010] Optionally, the system further comprises a first resistor;

[0011] The first end of the first resistor is connected to the third end of the wake-up circuit and the output end of the clamping circuit respectively, and the second end of the first resistor is connected to the first access point of the charging interface.

[0012] In the present application, due to the presence of the first resistor, the predetermined voltage value clamped by the clamping circuit can be divided, so that when the connection state of the charging interface and the power output interface is different, the voltage value of the voltage signal at the input end of the CC signal detection circuit is different, and the level of the CC signal output by the output end of the CC signal detection circuit is also different. In this way, the reliability and accuracy of the control module in judging the type of the power output interface and the connection state of the charging interface and the power output interface according to the level of the CC signal can be effectively guaranteed. In addition, since the CC signal detection process of the CC signal processing system in the present application is not affected by the voltage change of the power supply, it can be compatible with the voltage range of different low-voltage batteries of different vehicle models, and can meet the detection of CC signals within a wider voltage range.

[0013] Optionally, the clamping circuit includes a switch circuit and a first diode;

[0014] The first end of the switch circuit is connected to the output end of the control module, the second end of the switch circuit is connected to the anode of the first diode, the control end of the switch circuit is connected to the first control end of the control module, and the cathode of the first diode is connected to the first end of the first resistor.

[0015] Optionally, the switch circuit includes a second triode, a third triode, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor;

[0016] The emitter of the second transistor is connected to the output end of the control module, the collector of the second transistor is connected to the anode of the first diode, the thirteenth resistor is connected between the emitter and the base of the second transistor, the base of the second transistor is connected to the first end of the fourteenth resistor, the second end of the fourteenth resistor is connected to the collector of the third transistor, the emitter of the third transistor is connected to the ground wire, the fifteenth resistor is connected between the emitter and the base of the third transistor, the base of the third transistor is connected to the first end of the sixteenth resistor, and the second end of the sixteenth resistor is connected to the first control end of the control module.

[0017] Optionally, the CC signal detection circuit is a differential sampling circuit.

[0018] Optionally, the CC signal detection circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second diode and an operational amplifier;

[0019] The first end of the second resistor is connected to the first access point of the charging interface, the second end of the second resistor is respectively connected to the first end of the third resistor, the positive electrode of the second diode and the non-inverting input terminal of the operational amplifier, the second end of the third resistor is connected to the ground wire, the negative electrode of the second diode and the positive power supply terminal of the operational amplifier are both connected to the output terminal of the control module, and the negative power supply terminal of the operational amplifier is connected to the ground wire;

[0020] The first end of the fourth resistor is connected to the second access point of the charging interface, the second end of the fourth resistor is connected to the inverting input terminal of the operational amplifier, and the fifth resistor is connected between the inverting input terminal and the output terminal of the operational amplifier; the output terminal of the operational amplifier is connected to the detection terminal of the control module.

[0021] Optionally, the wake-up circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first transistor and a P-type switch tube;

[0022] The emitter of the first transistor is used to be connected to the power supply, the collector of the first transistor is connected to the wake-up end of the control module, the sixth resistor is connected between the emitter of the first transistor and the base of the first transistor, and the base of the first transistor is connected to the source of the P-type switch tube;

[0023] The seventh resistor is connected between the source and the gate of the P-type switching tube, the gate of the P-type switching tube is connected to the first end of the eighth resistor, the second end of the eighth resistor is connected to the output end of the clamping circuit, the drain of the P-type switching tube is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the ground wire.

[0024] Optionally, the system further includes a wake-up holding circuit, wherein the wake-up holding circuit includes an N-type switch tube, a tenth resistor, an eleventh resistor and a twelfth resistor;

[0025] The drain of the N-type switch tube is connected to the first end of the tenth resistor, the second end of the tenth resistor is connected to the base of the first transistor, the gate of the N-type switch tube is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the second control end of the control module, the twelfth resistor is connected between the source and the gate of the N-type switch tube, and the source of the N-type switch tube is connected to the ground wire.

[0026] Optionally, after waking up, the control module is used to output a voltage signal of the first preset voltage value at the output end of the control module, and control the clamping circuit to be turned on; determine whether the power output interface is connected to the charging interface according to the level of the CC signal output by the CC signal detection circuit; if it is determined that the power output interface is connected to the charging interface, control the clamping circuit to be turned on and control the N-type switch tube to be turned on; if it is determined that the power output interface is not connected to the charging interface, control the N-type switch tube to be turned off and control the clamping circuit to be turned off.

[0027] Optionally, the control module includes a voltage conversion module and a micro control unit MCU;

[0028] The power supply end of the voltage conversion module is used to be connected to the power supply, the wake-up end of the voltage conversion module is connected to the second end of the wake-up circuit, the first output end of the voltage conversion module is connected to the power supply end of the MCU, the second output end of the voltage conversion module is respectively connected to the input end of the clamping circuit and the power supply end of the CC signal detection circuit, the second output end of the voltage conversion module is used to output the voltage signal of the first preset voltage value, and the first output end of the voltage conversion module is used to output the voltage signal of the second preset voltage value;

[0029] The first control end of the MCU is connected to the control end of the clamp circuit, and the detection end of the MCU is connected to the output end of the CC signal detection circuit.

[0030] Optionally, the voltage conversion module includes a first power chip and a second power chip;

[0031] The first end of the first power chip is used to connect to the power supply, the wake-up end of the first power chip is connected to the second end of the wake-up circuit, the first output end of the first power chip is connected to the input end of the second power chip, the output end of the second power chip is connected to the power end of the MCU, and the second output end of the first power chip is respectively connected to the input end of the clamping circuit and the power supply end of the CC signal detection circuit;

[0032] Among them, the first power supply chip is used to convert the input voltage signal into a voltage signal of the first preset voltage value, the first output end and the second output end of the first power supply chip are both used to output the voltage signal of the first preset voltage value, the second power supply chip is used to convert the input voltage signal of the first preset voltage value into a voltage signal of the second preset voltage value, the output end of the second power supply chip is used to output the voltage signal of the second preset voltage value, and the first preset voltage value is different from the second preset voltage value.

[0033] Optionally, the first preset voltage value is 5 volts, and the second preset voltage value is 3.3 volts. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a circuit structure diagram of a CC signal detection circuit provided by the related technology;

[0036] Figure 2 is a circuit structure diagram of a first CC signal processing system provided in an embodiment of the present application;

[0037] Figure 3 is a circuit structure diagram of a second CC signal processing system provided in an embodiment of the present application;

[0038] Figure 4 is a circuit structure diagram of a third CC signal processing system provided in an embodiment of the present application;

[0039] Figure 5 is a circuit structure diagram of a switch circuit provided in an embodiment of the present application;

[0040] Figure 6 is a circuit structure diagram of a fourth CC signal processing system provided in an embodiment of the present application;

[0041] Figure 7 is a circuit structure diagram of a fifth CC signal processing system provided in an embodiment of the present application;

[0042] Figure 8 is a circuit structure diagram of a sixth CC signal processing system provided in an embodiment of the present application;

[0043] Fig. 9 is a circuit structure diagram of a seventh CC signal processing system provided in an embodiment of the present application;

[0044] Fig.10 is a circuit structure diagram of an eighth CC signal processing system provided in an embodiment of the present application;

[0045] Fig.11 is a circuit structure diagram of a ninth CC signal processing system provided in an embodiment of the present application;

[0046] Fig.12 It is a circuit structure diagram of the tenth CC signal processing system provided in an embodiment of the present application.

[0047] Reference numerals:

[0048] Related technologies:

[0049] 101: low voltage battery, 102: CC signal detection circuit, 103: MCU, 104: charging gun, R: resistor, Qa: transistor, Qb: MOS tube, RC: a resistor in the charging gun, R0: another resistor in the charging gun;

[0050] This application:

[0051] 200: CC signal processing system, 201: control module, 2011: voltage conversion module, 2012: MCU, 2013: first power chip, 2014: second power chip, 202: wake-up circuit, 203: CC signal detection circuit, 204: clamping circuit, 205: power supply, 2061: first access point of charging interface, 2062: second access point of charging interface, 207: power output interface, 208: wake-up holding circuit;

[0052] Q1: the first transistor, b1: the base of the first transistor, c1: the collector of the first transistor, e1: the emitter of the first transistor, Q2: the second transistor, b2: the base of the second transistor, c2: the collector of the second transistor, e2: the emitter of the second transistor, Q3: the third transistor, b3: the base of the third transistor, c3: the collector of the third transistor, e3: the emitter of the third transistor, Q4: PMOS tube, g4: the gate of PMOS tube, d4: the drain of PMOS tube, s4: the source of PMOS tube, Q5: NMOS tube, g5: the gate of NMOS tube, d5: the drain of NMOS tube, s5: NMOS The source of the tube, D1: the first diode, D2: the second diode, U: operational amplifier, S1: switching circuit, R1: the first resistor, R2: the second resistor, R3: the third resistor, R4: the fourth resistor, R5: the fifth resistor, R6: the sixth resistor, R7: the seventh resistor, R8: the eighth resistor, R9: the ninth resistor, R10: the tenth resistor, R11: the eleventh resistor, R12: the twelfth resistor, R13: the thirteenth resistor, R14: the fourteenth resistor, R15: the fifteenth resistor, R16: the sixteenth resistor, RC: a resistor in the power output interface, R0: another resistor in the power output interface, S0: a switch in the power output interface. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0054] It should be understood that the "plurality" mentioned in this application refers to two or more. In addition, in order to facilitate the clear description of the technical solution of this application, the words "first" and "second" are used to distinguish the same or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first" and "second" do not limit the quantity and execution order, and the words "first" and "second" do not necessarily limit them to be different.

[0055] Before explaining the embodiments of the present application in detail, the application scenarios of the embodiments of the present application are first described.

[0056] The power battery will consume electric energy when driving an electric vehicle. When the power battery is insufficient, a charging gun needs to be inserted into the charging port of the electric vehicle. The OBC in the electric vehicle will convert the AC power input by the charging gun into DC power to charge the power battery. When the charging gun is successfully inserted into the charging port based on the detected CC signal and the type of charging gun is determined, the OBC charges the power battery. However, the low-voltage part in the OBC is powered by the low-voltage battery in the electric vehicle. After the low-voltage battery has been powered for a period of time, the voltage of the low-voltage battery will decrease. In the related art, the voltage reduction of the low-voltage battery will affect the judgment of the connection status of the charging gun and the charging port.

[0057] To this end, an embodiment of the present application provides a CC signal processing system, which can accurately detect whether the charging gun is inserted into the charging port even when the voltage of the low-voltage battery changes, thereby improving detection reliability.

[0058] The CC signal processing system provided in the embodiment of the present application can be applied to systems powered by 12V (volt) batteries (system range is 9V-16V), 24V batteries (system range is 16V-32V) and other system-wide low-voltage batteries. That is, the CC signal processing system provided in the embodiment of the present application can be compatible with low-voltage batteries of different system ranges of different vehicle models, for example, it can be compatible with low-voltage batteries within the system range of 9V-32V.

[0059] The CC signal processing system provided in the embodiment of the present application can be applied to the OBC, that is, the OBC includes the CC signal processing system. In this way, the OBC can accurately detect the connection status of the charging gun and the charging interface and the type of the charging gun through the CC signal processing system, and then charge the power battery accordingly. The OBC has the function of converting the AC power (such as 220V AC power) transmitted from the charging gun to the charging interface into DC power to charge the power battery of the electric vehicle. The OBC can determine whether to charge the power battery based on the connection status between the charging gun and the charging interface, and can adjust the charging current based on the type of the charging gun.

[0060] The CC signal processing system provided in the embodiment of the present application is explained in detail below.

[0061] Figure 2 is a circuit structure diagram of a CC signal processing system 200 provided in an embodiment of the present application. Figure 2 The CC signal processing system 200 includes a control module 201 , a wake-up circuit 202 , a CC signal detection circuit 203 and a clamping circuit 204 .

[0062] The power supply end of the control module 201 and the first end of the wake-up circuit 202 are both used to connect to the power supply 205; the wake-up end of the control module 201 is connected to the second end of the wake-up circuit 202; the first control end of the control module 201 is connected to the control end of the clamping circuit 204 to control the connection or shutdown of the clamping circuit 204; the output end of the control module 201 is respectively connected to the input end of the clamping circuit 204 and the power supply end of the CC signal detection circuit 203, and the output end of the control module 201 is used to output a voltage signal of a first preset voltage value; the detection end of the control module 201 is connected to the output end of the CC signal detection circuit 203.

[0063] The third end of the wake-up circuit 202, the output end of the clamping circuit 204 and the first input end of the CC signal detection circuit 203 are all connected to the first access point 2061 of the charging interface, the fourth end of the wake-up circuit 202 and the second input end of the CC signal detection circuit 203 are all connected to the second access point 2062 of the charging interface, and the first access point 2061 and the second access point 2062 of the charging interface are used to access the power output interface 207.

[0064] The control module 201 has a function of converting the voltage signal output by the power supply 205 into a voltage signal with a fixed voltage value to supply power to the clamp circuit 204 and the CC signal detection circuit 203 .

[0065] The charging interface refers to an interface in an electric vehicle for inputting AC power to an external charging device. The first access point 2061 and the second access point 2062 of the charging interface refer to connection points when the power output interface 207 of the charging device is connected to the CC signal processing system 200. The second access point 2062 of the charging interface is connected to the ground wire.

[0066] The power output interface 207 refers to the interface for the charging device to output AC power. The power output interface 207 can be a plug of a charging gun, and in this case, the charging interface can be a socket. After the charging interface is connected to the power output interface 207, the ground wire in the charging device is connected to the ground wire in the CC signal processing system 200.

[0067] See also Figure 2The power output interface 207 generally includes a resistor RC, a resistor R0, and a switch S0. The resistors RC and R0 can be referred to as identification resistors of the power output interface 207. The resistors RC and R0 are connected to the ground wire in the charging device. For example, the resistance value of the resistor RC can be 1.5KΩ (kilo-ohms), and the resistance value of the resistor R0 can be 1.8KΩ. The switch S0 can be a mechanical switch on the power output interface 207 for the user to press. Optionally, the switch S0 can be a normally closed switch. When the user presses the mechanical switch, the switch S0 is disconnected; when the user releases the mechanical switch, the switch S0 is closed.

[0068] The wake-up circuit 202 is a circuit for waking up the control module 201 so that the control module 201 can be powered on and work. When the power output interface 207 is not connected to the charging interface, the second end of the wake-up circuit 202 does not output a wake-up signal; when the power output interface 207 is connected to the charging interface, the second end of the wake-up circuit 202 outputs a wake-up signal to drive the control module 201 to work. The wake-up signal can be a high-level enable signal to enable the power supply 205 to power the control module 201. The power output interface 207 described in the embodiment of the present application is not connected to the charging interface, which means that the charging interface is not connected to the power output interface 207. The power output interface 207 described in the embodiment of the present application is connected to the charging interface, which means that the charging interface is connected to the power output interface 207.

[0069] After the control module 201 wakes up, a voltage signal of a first preset voltage value can be output at the output end of the control module 201, and the clamping circuit 204 can be controlled to be turned on. Then, whether the charging interface is connected to the power output interface 207 can be determined based on the level of the CC signal output by the CC signal detection circuit 203.

[0070] The CC signal detection circuit 203 is a circuit for outputting a CC signal, which is a sampling signal output to the detection end of the control module 201. The detection end of the control module 201 can be an AD (Analog Digital) port, which can receive analog input and perform analog-to-digital conversion.

[0071] The clamp circuit 204 is used to clamp the voltage signal of the first preset voltage value output by the control module 201 to another predetermined voltage value. That is, the voltage value of the voltage signal output by the clamp circuit 204 is the predetermined voltage value.

[0072] The first preset voltage value may be pre-set, for example, the first preset voltage value may be 5V, or may be a voltage value of other levels, which is not limited in the embodiment of the present application.

[0073] The power source 205 may be a low-voltage battery inside the electric vehicle. The power source 205 may be used to power the control module 201 and the wake-up circuit 202 , and may also be used to power other low-voltage systems inside the electric vehicle.

[0074] When the CC signal processing system 200 provided in the embodiment of the present application starts to work, the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a dormant state. At this time, the clamping circuit 204 is in an off state, and the CC signal detection circuit 203 is also in a non-working state.

[0075] When the charging interface is not connected to the power output interface 207, that is, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a dormant state, at which time the clamp circuit 204 is in a turned-off state, and the CC signal detection circuit 203 is also in a non-operating state. In this case, the power output by the power supply 205 flows through the wake-up circuit 202 and the CC signal detection circuit 203, that is, the power consumption path is a loop composed of the wake-up circuit 202 and the CC signal detection circuit 203, so the static power consumption generated is very small, generally a maximum of several hundred microamperes.

[0076] When the charging interface is connected to the power output interface 207, that is, the switch S0 and the resistor RC, or the resistor RC and the resistor R0 are connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 outputs a wake-up signal to the wake-up end of the control module 201, and the control module 201 is awakened. After the control module 201 is awakened, the output end of the control module 201 outputs a voltage signal of a first preset voltage value to the input end of the clamp circuit 204 and the power supply end of the CC signal detection circuit 203, and the control module 201 controls the clamp circuit 204 to be turned on. In this way, the clamp circuit 204 and the CC signal detection circuit 203 work. The clamp circuit 204 clamps the voltage value of the output end of the clamp circuit 204 to a predetermined voltage value. At this time, there are voltage signals on the first input end and the second input end of the CC signal detection circuit 203. In this case, the voltage value of the voltage signal at the input end of the CC signal detection circuit 203 depends on the predetermined voltage value clamped by the clamp circuit 204, and is not affected by the voltage change of the power supply 205, so that the level of the CC signal output by the output end of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205, so that the output end of the CC signal detection circuit 203 can accurately and reliably output the CC signal. The control module 201 can determine that the power output interface 207 is connected to the charging interface according to the level of the CC signal output by the CC signal detection circuit 203.

[0077] In the embodiment of the present application, when the control module 201 wakes up, due to the existence of the clamp circuit 204, it can be ensured that the voltage value of the voltage signal at the input end of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205, and it can also be ensured that the level of the CC signal output by the output end of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205. In this way, the reliability and accuracy of the control module 201 judging whether the charging interface is connected to the power output interface 207 according to the level of the CC signal can be effectively guaranteed. In addition, since the CC signal detection process of the CC signal processing system 200 in the embodiment of the present application is not affected by the voltage change of the power supply 205, it can be compatible with the voltage range of different low-voltage batteries of different vehicle models, and can meet the detection of CC signals in a wider voltage range.

[0078] Alternatively, see Figure 3 , the CC signal processing system 200 also includes a first resistor R1.

[0079] The first end of the first resistor R1 is connected to the third end of the wake-up circuit 202 and the output end of the clamp circuit 204 respectively, and the second end of the first resistor R1 is connected to the first access point 2061 of the charging interface.

[0080] The connection states of the charging interface and the power output interface 207 include unconnected, semi-connected, and fully connected. Among them, the unconnected state of the charging interface and the power output interface 207 refers to the state in which the resistor RC, the resistor R0, and the switch S0 are not connected to the charging interface; the semi-connected state of the charging interface and the power output interface 207 refers to the state in which the switch S0 is disconnected, and the resistor RC and the resistor R0 are simultaneously connected to the charging interface; the fully connected state of the charging interface and the power output interface 207 refers to the state in which the switch S0 is closed, and the resistor RC and the switch S0 are connected to the charging interface. The power output interface 207 described in the embodiment of the present application is not connected to the charging interface, which means that the charging interface and the power output interface 207 are not connected. The power output interface 207 described in the embodiment of the present application is connected to the charging interface, which means that the charging interface and the power output interface 207 are semi-connected or fully connected, that is, the resistor RC, the resistor R0, and the switch S0 in the power output interface 207 are connected between the first access point 2061 and the second access point 2062 in the charging interface.

[0081] Generally, if a user wants to charge an electric vehicle, he will hold the power output interface 207, at which time the mechanical switch will be pressed by the user, and the switch S0 will be disconnected. Then the user holds the power output interface 207 and inserts it into the charging interface. Since the switch S0 is disconnected, the power output interface 207 is semi-connected with the charging interface. After that, the user releases the mechanical switch of the power output interface 207, the switch S0 is closed, and the power output interface 207 is fully connected with the charging interface.

[0082] If the control module 201 determines that the charging interface and the power output interface 207 are half-connected, the clamp circuit 204 is controlled to be turned on; if the control module 201 determines that the charging interface and the power output interface 207 are fully connected, the clamp circuit 204 is kept in the turned-on state.

[0083] When the charging interface and different types of power output interfaces 207 are in a state of being unconnected, semi-connected, or fully connected, the level of the CC signal output by the CC signal detection circuit 203 is different. In this case, the control module 201 can determine the type of the power output interface 207 and the connection state between the charging interface and the power output interface 207 according to the level of the CC signal output by the CC signal detection circuit 203.

[0084] When the charging interface is not connected to the power output interface 207, that is, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a dormant state, at which time the clamp circuit 204 is in a turned-off state, and the CC signal detection circuit 203 is also in a non-operating state. In this case, the power output by the power supply 205 flows through the wake-up circuit 202, the first resistor R1 and the CC signal detection circuit 203, that is, the power consumption path is a loop composed of the wake-up circuit 202, the first resistor R1 and the CC signal detection circuit 203, so the static power consumption generated is very small, generally a maximum of several hundred microamperes.

[0085] When the charging interface is half-connected to the power output interface 207, that is, the switch S0 is disconnected, and the resistor RC and the resistor R0 are both connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 outputs a wake-up signal to the wake-up end of the control module 201, and the control module 201 is awakened. After the control module 201 is awakened, the output end of the control module 201 outputs a voltage signal of a first preset voltage value to the input end of the clamp circuit 204 and the power supply end of the CC signal detection circuit 203, and the control module 201 controls the clamp circuit 204 to be turned on. In this way, the clamp circuit 204 and the CC signal detection circuit 203 work. The clamp circuit 204 clamps the voltage value of the output end of the clamp circuit 204 to a predetermined voltage value. At this time, the first resistor R1, the resistor RC, the resistor R0 and the CC signal detection circuit 203 divide the predetermined voltage value, so that the voltage value of the voltage signal at the first input terminal and the second input terminal of the CC signal detection circuit 203 is obtained by dividing the predetermined voltage value by the first resistor R1, the resistor RC and the resistor R0. In this case, the voltage value of the voltage signal at the input terminal of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205, and then the level of the CC signal output by the output terminal of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205, so that the output terminal of the CC signal detection circuit 203 can accurately and reliably output the CC signal. The control module 201 can determine the type of the power output interface 207 according to the level of the CC signal output by the CC signal detection circuit 203, and determine that the charging interface is semi-connected with the power output interface 207. At this time, the power battery of the electric vehicle is not charged.

[0086] When the charging interface and the power output interface 207 are fully connected, that is, the switch S0 is closed, the resistor R0 is short-circuited, and only the resistor RC is connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 outputs a wake-up signal to the wake-up end of the control module 201, the control module 201 continues to wake up, and the output end of the control module 201 outputs a voltage signal of a first preset voltage value to the input end of the clamping circuit 204 and the power supply end of the CC signal detection circuit 203, and the control module 201 controls the clamping circuit 204 to be turned on. In this way, the clamping circuit 204 and the CC signal detection circuit 203 work. The clamping circuit 204 clamps the voltage value of the output end of the clamping circuit 204 to a predetermined voltage value. At this time, the first resistor R1, the resistor RC and the CC signal detection circuit 203 divide the predetermined voltage value, so that the voltage value of the voltage signal at the first input end and the second input end of the CC signal detection circuit 203 is obtained by dividing the predetermined voltage value by the first resistor R1 and the resistor RC. In this case, the voltage value of the voltage signal at the input end of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205, and then the level of the CC signal outputted by the output end of the CC signal detection circuit 203 is also not affected by the voltage change of the power supply 205, thereby ensuring that the output end of the CC signal detection circuit 203 can accurately and reliably output the CC signal. The control module 201 can determine the type of the power output interface 207 according to the level of the CC signal outputted by the CC signal detection circuit 203, and determine whether the charging interface is fully connected to the power output interface 207.

[0087] After the charging interface and the power output interface 207 are changed from fully connected to unconnected, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062. At this time, the second end of the wake-up circuit 202 does not output a wake-up signal, the control module 201 enters a dormant state, the clamping circuit 204 becomes a shutdown state, and the CC signal detection circuit 203 enters a non-operating state. In this case, the power consumption path of the CC signal processing system 200 is a loop composed of the wake-up circuit 202, the first resistor R1 and the CC signal detection circuit 203, and the CC signal processing system 200 restores static power consumption.

[0088] It is worth noting that, due to the presence of the first resistor R1, the predetermined voltage value clamped by the clamping circuit 204 can be divided, so that when the connection state of the charging interface and the power output interface 207 is different, the voltage value of the voltage signal at the input end of the CC signal detection circuit 203 is different, and the level of the CC signal output by the output end of the CC signal detection circuit 203 is also different. In this way, the reliability and accuracy of the control module 201 in judging the type of the power output interface 207 and the connection state of the charging interface and the power output interface 207 according to the level of the CC signal can be effectively guaranteed. In addition, since the CC signal detection process of the CC signal processing system 200 in the embodiment of the present application is not affected by the voltage change of the power supply 205, it can be compatible with the voltage range of different low-voltage batteries of different vehicle models, and can meet the detection of CC signals in a wider voltage range.

[0089] In addition, when the charging interface is not connected to the power output interface 207, the wake-up circuit 202 can prevent the power supply 205 from supplying power to the control module 201, allowing the control module 201 to sleep, thereby reducing the static power consumption of the CC signal processing system 200 and the power loss of the power supply 205.

[0090] Alternatively, see Figure 4 The clamp circuit 204 includes a switch circuit S1 and a first diode D1. The first end of the switch circuit S1 is connected to the output end of the control module 201, the second end of the switch circuit S1 is connected to the anode of the first diode D1, the control end of the switch circuit S1 is connected to the first control end of the control module 201, and the cathode of the first diode D1 is connected to the first end of the first resistor R1.

[0091] The switch circuit S1 is used to realize the switching on or off of the clamp circuit 204. That is, when the switch circuit S1 is turned on, the clamp circuit 204 is turned on; when the switch circuit S1 is turned off, the clamp circuit 204 is turned off. When the switch circuit S1 is turned on, the voltage signal of the first preset voltage value outputted from the output end of the control module 201 can be transmitted to the positive electrode of the first diode D1.

[0092] By utilizing the unidirectional conductivity of the first diode D1, when the first diode D1 is turned on, the voltage difference between the positive and negative electrodes of the first diode D1 is limited to the tube voltage drop. In this way, since the tube voltage drop of the first diode D1 is fixed, when the voltage signal of the first preset voltage value is input to the positive electrode of the first diode D1, the voltage signal output from the negative electrode of the first diode D1 will be clamped at a predetermined voltage value. For example, the first preset voltage value is 5V, and the tube voltage drop of the first diode D1 is 0.7V, that is, the voltage difference between the positive and negative electrodes of the first diode D1 is fixed to 0.7V. Therefore, when a 5V voltage signal is input to the positive electrode of the first diode D1, the voltage signal output from the negative electrode of the first diode D1 will be clamped at 5V-0.7V=4.3V.

[0093] The presence of the first diode D1 can also prevent the electric energy output by the power supply 205 from flowing into the clamping circuit 204 , thereby avoiding affecting the voltage division of the first input terminal of the CC signal detection circuit 203 .

[0094] Alternatively, see Figure 5 The switch circuit S1 includes a second triode Q2, a third triode Q3, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15 and a sixteenth resistor R16. The emitter e2 of the second triode Q2 is connected to the output end of the control module 201, the collector c2 of the second triode Q2 is connected to the positive electrode of the first diode D1, the thirteenth resistor R13 is connected between the emitter e2 and the base b2 of the second triode Q2, the base b2 of the second triode Q2 is connected to the first end of the fourteenth resistor R14, the second end of the fourteenth resistor R14 is connected to the collector c3 of the third triode Q3, the emitter e3 of the third triode Q3 is connected to the ground line, the fifteenth resistor R15 is connected between the emitter e3 and the base b3 of the third triode Q3, the base b3 of the third triode Q3 is connected to the first end of the sixteenth resistor R16, and the second end of the sixteenth resistor R16 is connected to the first control end of the control module 201.

[0095] In the case where the output terminal of the control module 201 outputs a voltage signal of a first preset voltage value, a voltage is generated on the collector c3 of the third triode Q3. After the first control terminal of the control module 201 outputs a voltage signal, the third triode Q3 is turned on, and since the emitter e3 of the third triode Q3 is grounded, the base b2 voltage of the second triode Q2 is pulled down, and the voltage signal outputted by the output terminal of the control module 201 generates a voltage at the emitter e2 of the second triode Q2, so the second triode Q2 is turned on, and the switch circuit S1 is also turned on.

[0096] When the first control terminal of the control module 201 does not output a voltage signal, the third transistor Q3 is turned off, and then the second transistor Q2 is also turned off, and the switch circuit S1 is also turned off. When the output terminal of the control module 201 does not output a voltage signal, the second transistor Q2 is turned off, and the switch circuit S1 is also turned off.

[0097] Alternatively, see Figure 6 , the CC signal detection circuit 203 is a differential sampling circuit.

[0098] In the embodiment of the present application, the differential sampling circuit can obtain the voltage difference between the first access point 2061 and the second access point 2062 of the charging interface, and output a corresponding CC signal after amplifying the voltage difference.

[0099] Specifically, see Figure 6 , the CC signal detection circuit 203 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second diode D2 and an operational amplifier U. The first end of the second resistor R2 is connected to the first access point 2061 of the charging interface, the second end of the second resistor R2 is respectively connected to the first end of the third resistor R3, the positive electrode of the second diode D2 and the non-inverting input end of the operational amplifier U, the second end of the third resistor R3 is connected to the ground line, the negative electrode of the second diode D2 and the positive power supply end VCC of the operational amplifier U are both connected to the output end of the control module 201, and the negative power supply end of the operational amplifier U is connected to the ground line. The first end of the fourth resistor R4 is connected to the second access point 2062 of the charging interface, the second end of the fourth resistor R4 is connected to the inverting input end of the operational amplifier U, and the fifth resistor R5 is connected between the inverting input end and the output end of the operational amplifier U; the output end of the operational amplifier U is connected to the detection end of the control module 201.

[0100] The second resistor R2 and the third resistor R3 may be resistors with relatively large resistances. For example, the resistances of the second resistor R2 and the third resistor R3 may both be 100KΩ.

[0101] When the CC signal processing system 200 provided in the embodiment of the present application starts to work, the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a sleep state. At this time, there is no power input to the positive power supply terminal VCC of the operational amplifier U, and the operational amplifier U does not work.

[0102] When the charging interface is not connected to the power output interface 207, that is, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a dormant state. At this time, the positive power supply terminal VCC of the operational amplifier U has no power input, and the operational amplifier U does not work.

[0103] When the charging interface is half-connected to the power output interface 207, that is, the switch S0 is disconnected, and the resistors RC and R0 are both connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 outputs a wake-up signal to the wake-up end of the control module 201, and the control module 201 is powered on, and then the operational amplifier U is powered on. In this case, the first resistor R1, the resistor RC, the resistor R0, the second resistor R2, and the third resistor R3 divide the predetermined voltage value clamped by the clamping circuit 204. At this time, the operational amplifier U samples the voltage of the resistors RC and R0, so it is not affected by the voltage change of the power supply 205.

[0104] When the charging interface and the power output interface 207 are fully connected, that is, the switch S0 is closed, the resistor R0 is short-circuited, and only the resistor RC is connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 outputs a wake-up signal to the wake-up end of the control module 201, and the control module 201 is continuously powered and works, and then the operational amplifier U is continuously powered and works. In this case, the first resistor R1, the resistor RC, the second resistor R2, and the third resistor R3 divide the predetermined voltage value clamped by the clamping circuit 204. At this time, the operational amplifier U samples the voltage of the resistor RC, so it is not affected by the voltage change of the power supply 205.

[0105] After the charging interface and the power output interface 207 are changed from fully connected to unconnected, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062, the second end of the wake-up circuit 202 does not output a wake-up signal, the control module 201 enters a dormant state, and then the operational amplifier U also enters a non-working state.

[0106] It is worth noting that, when the charging interface is not connected to the power output interface 207, the power output by the power supply 205 flows through the wake-up circuit 202, the first resistor R1, the second resistor R2 and the third resistor R3. Since the resistance values ​​of the second resistor R2 and the third resistor R3 are relatively large, the voltage divided by the second resistor R2 and the third resistor R3 is relatively large, which can ensure that the voltage at the in-phase input terminal of the operational amplifier U will not be too large to damage the operational amplifier U.

[0107] In addition, in the embodiment of the present application, the awakening circuit 202 is isolated from the detection end of the control module 201 by the operational amplifier U, which can protect the control module 201.

[0108] Alternatively, see Figure 7The wake-up circuit 202 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q1 and a P-type switch. The emitter e1 of the first transistor Q1 is used to connect to the power supply 205, the collector c1 of the first transistor Q1 is connected to the wake-up end of the control module 201, the sixth resistor R6 is connected between the emitter e1 of the first transistor Q1 and the base b1 of the first transistor Q1, and the base b1 of the first transistor Q1 is connected to the source of the P-type switch. The seventh resistor R7 is connected between the source and the gate of the P-type switch, the gate of the P-type switch is connected to the first end of the eighth resistor R8, the second end of the eighth resistor R8 is connected to the output end of the clamp circuit 204, the drain of the P-type switch is connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is connected to the ground line.

[0109] The first transistor Q1 may be a PNP transistor.

[0110] The P-type switch tube may be a PMOS tube or a P-type IGBT (Insulated Gate Bipolar Transistor), which is not limited in the present application. The following description will be made by taking the P-type switch tube being a PMOS tube Q4 as an example.

[0111] For a possible implementation, see Figure 8 , the P-type switch tube can be a PMOS tube Q4.

[0112] The source s4 of the PMOS tube Q4 is connected to the base b1 of the first transistor Q1, the gate g4 of the PMOS tube Q4 is connected to the first end of the eighth resistor R8, the drain d4 of the PMOS tube Q4 is connected to the first end of the ninth resistor R9, and the seventh resistor R7 is connected between the source s4 and the gate g4 of the PMOS tube Q4.

[0113] The PMOS tube Q4 is a field effect transistor that can be used in analog circuits and digital circuits. It can be used as an electronic switch, controlled rectifier, etc. It is a voltage-driven device.

[0114] When the charging interface is not connected to the power output interface 207, that is, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062, since the voltage division of the eighth resistor R8, the first resistor R1, the second resistor R2, the third resistor R3, the second diode D2 and the operational amplifier U is relatively large, the voltage on the gate g4 of the PMOS tube Q4 is relatively large, and the absolute value of the voltage difference between the gate g4 and the source s4 of the PMOS tube Q4 is less than the turn-on threshold of the PMOS tube Q4, the PMOS tube Q4 is turned off, the base b1 of the first transistor Q1 has a relatively high voltage, and thus the first transistor Q1 is turned off. At this time, the collector c1 of the first transistor Q1 does not output a wake-up signal to the wake-up end of the control module 201.

[0115] When the charging interface is half-connected with the power output interface 207, that is, the switch S0 is disconnected, and the resistors RC and R0 are both connected between the first access point 2061 and the second access point 2062, since the resistors RC and R0 are connected in parallel with the second resistor R2 and the third resistor R3, the voltage division of the resistors RC, R0, the second resistor R2 and the third resistor R3 becomes smaller, resulting in a smaller voltage on the gate g4 of the PMOS tube Q4, and the absolute value of the voltage difference between the gate g4 and the source s4 of the PMOS tube Q4 is greater than the turn-on threshold of the PMOS tube Q4, the PMOS tube Q4 is turned on, and the base b1 voltage of the first transistor Q1 is pulled down, so that the first transistor Q1 is turned on, and at this time, the collector c1 of the first transistor Q1 outputs a wake-up signal to the wake-up terminal of the control module 201.

[0116] When the charging interface is fully connected with the power output interface 207, that is, the switch S0 is closed, the resistor R0 is short-circuited, and only the resistor RC is connected between the first access point 2061 and the second access point 2062, since the resistor RC is connected in parallel with the second resistor R2 and the third resistor R3, the voltage division of the resistor RC, the second resistor R2 and the third resistor R3 is still small, so the voltage on the gate g4 of the PMOS tube Q4 is still small, and the absolute value of the voltage difference between the gate g4 and the source s4 of the PMOS tube Q4 is still greater than the turn-on threshold of the PMOS tube Q4, the PMOS tube Q4 remains turned on, the first transistor Q1 remains turned on, and the collector c1 of the first transistor Q1 still outputs a wake-up signal to the wake-up terminal of the control module 201.

[0117] It is worth noting that the resistance values ​​of the second resistor R2 and the third resistor R3 in the embodiment of the present application are both relatively large. In this way, it can be reliably ensured that when the charging interface and the power output interface 207 are not connected, the voltage on the gate g4 of the PMOS tube Q4 is relatively large; and when the charging interface and the power output interface 207 are half-connected or fully connected, the voltage on the gate g4 of the PMOS tube Q4 is relatively small.

[0118] After the charging interface and the power output interface 207 are changed from fully connected to unconnected, the resistor RC, the resistor R0 and the switch S0 are not connected between the first access point 2061 and the second access point 2062. In this case, although the clamping circuit 204 clamps the voltage signal at its output end to a predetermined voltage value, the predetermined voltage value cannot make the absolute value of the voltage difference between the gate g4 and the source s4 of the PMOS tube Q4 greater than the conduction threshold of the PMOS tube Q4, so the PMOS tube Q4 is turned off, the first transistor Q1 is turned off, and at this time, the collector c1 of the first transistor Q1 stops outputting the wake-up signal to the wake-up end of the control module 201.

[0119] Further, see Fig. 9 The CC signal processing system 200 further includes a wake-up and holding circuit 208, which includes an N-type switch tube, a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12. The drain of the N-type switch tube is connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10 is connected to the base b1 of the first transistor Q1, the gate of the N-type switch tube is connected to the first end of the eleventh resistor R11, the second end of the eleventh resistor R11 is connected to the second control end of the control module 201, the twelfth resistor R12 is connected between the source and the gate of the N-type switch tube, and the source of the N-type switch tube is connected to the ground line.

[0120] The wake-up holding circuit 208 is used to ensure that the first transistor Q1 is continuously turned on and the control module 201 is continuously powered.

[0121] The N-type switch tube may be an NMOS tube or an N-type IGBT, which is not limited in the present application. The following description will be made by taking the N-type switch tube being an NMOS tube Q5 as an example.

[0122] For a possible implementation, see Fig.10 , the N-type switch tube can be an NMOS tube Q5.

[0123] The drain d5 of the NMOS tube Q5 is connected to the first end of the tenth resistor R10, the gate g5 of the NMOS tube Q5 is connected to the first end of the eleventh resistor R11, the source s5 of the NMOS tube Q5 is connected to the ground line, and the twelfth resistor R12 is connected between the source s5 and the gate g5 of the NMOS tube Q5.

[0124] NMOS tube Q5 is a field effect transistor that can be used in analog circuits and digital circuits. It can be used as an electronic switch, controlled rectifier, etc. It is a voltage-driven device.

[0125] In this case, after the control module 201 wakes up, it can output a voltage signal of a first preset voltage value at the output end of the control module 201, and control the clamping circuit 204 to be turned on, and then it can determine whether the power output interface 207 is connected to the charging interface according to the level of the CC signal output by the CC signal detection circuit 203, that is, determine the connection state between the power output interface 207 and the charging interface. If the control module 201 determines that the charging interface is half-connected with the power output interface 207, it controls the clamping circuit 204 to be turned on and controls the NMOS tube Q5 to be turned on; if the control module 201 determines that the charging interface is fully connected with the power output interface 207, it continuously controls the clamping circuit 204 to be turned on and continuously controls the NMOS tube Q5 to be turned on; if the control module 201 determines that the charging interface is not connected with the power output interface 207, it controls the NMOS tube Q5 to be turned off and controls the clamping circuit 204 to be turned off.

[0126] The voltage signal output by the control module 201 to the NMOS tube Q5 for controlling the conduction of the NMOS tube Q5 may be a control signal output through an I / O (Input / Output) port of the MCU, and its level range may be consistent with that of the power supply 205 .

[0127] When the CC signal processing system 200 provided in the embodiment of the present application starts to work, the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a dormant state. At this time, the clamping circuit 204 is in an off state, the operational amplifier U is also in a non-working state, and the NMOS tube Q5 is also in an off state.

[0128] When the charging interface is not connected to the power output interface 207, the PMOS tube Q4 is turned off, the first transistor Q1 is turned off, and the second end of the wake-up circuit 202 does not output a wake-up signal, so the control module 201 is in a dormant state. At this time, the clamp circuit 204 is in an off state, the operational amplifier U is also in an off state, and the NMOS tube Q5 is also in an off state.

[0129] When the charging interface and the power output interface 207 are semi-connected, the PMOS tube Q4 is turned on, and the first transistor Q1 is turned on. At this time, the collector c1 of the first transistor Q1 outputs a wake-up signal to the wake-up end of the control module 201, and the control module 201 is awakened. After the control module 201 is awakened, the clamp circuit 204 and the operational amplifier U are powered on and work. At this time, the operational amplifier U samples the voltage of the resistor RC and the resistor R0, and the output end of the operational amplifier U outputs a CC signal to the detection end of the control module 201. The control module 201 can determine the type of the power output interface 207 according to the level of the CC signal output by the operational amplifier U, and determine that the charging interface and the power output interface 207 are semi-connected. At this time, the power battery of the electric vehicle is not charged, and the second control end of the control module 201 inputs a voltage signal to the gate g5 of the NMOS tube Q5. Since the source s5 of the NMOS tube Q5 is grounded, the absolute value of the voltage difference between the gate g5 and the source s5 of the NMOS tube Q5 is greater than the conduction threshold of the NMOS tube Q5, so the NMOS tube Q5 is turned on, and the base b1 voltage of the first transistor Q1 is pulled down through the NMOS tube Q5, which can ensure that the first transistor Q1 is continuously turned on.

[0130] When the charging interface and the power output interface 207 are fully connected, the PMOS tube Q4 is turned on, and the NMOS tube Q5 is also turned on, so the first transistor Q1 is turned on. At this time, the collector c1 of the first transistor Q1 outputs a wake-up signal to the wake-up terminal of the control module 201, and the control module 201 continues to work, and the clamp circuit 204 and the operational amplifier U continue to work. At this time, the operational amplifier U samples the voltage of the resistor RC, and the output end of the operational amplifier U outputs a CC signal to the detection end of the control module 201. The control module 201 can determine the type of the power output interface 207 according to the level of the CC signal output by the operational amplifier U, and determine that the charging interface and the power output interface 207 are fully connected. At this time, the second control end of the control module 201 continuously inputs a voltage signal to the gate g5 of the NMOS tube Q5, so that the first transistor Q1 can be ensured to be continuously turned on through the NMOS tube Q5.

[0131] It is worth noting that the power supply 205 may have voltage changes during use. If the power supply 205 has voltage changes, it may not be possible to ensure that the PMOS tube Q4 is turned on when the charging interface is half-connected or fully connected to the power output interface 207. For this reason, the embodiment of the present application is provided with a wake-up holding circuit 208, and by controlling the conduction of the NMOS tube Q5 in the wake-up holding circuit 208, the first triode Q1 is ensured to be continuously turned on, and then the collector c1 of the first triode Q1 is ensured to continuously output a wake-up signal to the wake-up terminal of the control module 201, so as to achieve the effect of ensuring that the control module 201 can be in a stable wake-up state.

[0132] When the charging interface and the power output interface 207 are changed from fully connected to unconnected, the PMOS tube Q4 is turned off, but the NMOS tube Q5 is still turned on, so the first transistor Q1 is turned on. At this time, the collector c1 of the first transistor Q1 outputs a wake-up signal to the wake-up end of the control module 201, the control module 201 works, and the clamping circuit 204 and the operational amplifier U work. At this time, the operational amplifier U samples the voltages of the first access point 2061 and the second access point 2062, and the output end of the operational amplifier U outputs a CC signal to the detection end of the control module 201. The control module 201 can determine that the charging interface and the power output interface 207 are not connected according to the level of the CC signal output by the operational amplifier U. At this time, the control module 201 controls the clamp circuit 204 to turn off, and the second control terminal of the control module 201 stops outputting a voltage signal to the gate g5 of the NMOS tube Q5. At this time, the absolute value of the voltage difference between the gate g5 and the source s5 of the NMOS tube Q5 is less than the conduction threshold of the NMOS tube Q5, so the NMOS tube Q5 is turned off. After the NMOS tube Q5 is turned off, the first transistor Q1 is turned off, and the collector c1 of the first transistor Q1 stops outputting a wake-up signal to the wake-up terminal of the control module 201, and the control module 201 enters a dormant state.

[0133] In a possible implementation, after the control module 201 determines that the charging interface and the power output interface 207 are changed from fully connected to unconnected according to the level of the CC signal output by the operational amplifier U, the second control end of the control module 201 can stop outputting the voltage signal to the gate g5 of the NMOS tube Q5 after waiting for a preset time. In this way, the NMOS tube Q5 will not be cut off at the moment when the charging interface and the power output interface 207 are changed from fully connected to unconnected, the first triode Q1 will not be turned off instantly, and the control module 201 will not change from the awake state to the dormant state instantly. In this way, the power part of the control module 201 can have sufficient time to shut down before the control module 201 loses power, which can avoid damaging the components of the power part of the control module 201. The preset time length can be set in advance, such as the preset time length can be 10 seconds, which is not limited in the embodiment of the present application.

[0134] Alternatively, see Fig.11The control module 201 includes a voltage conversion module 2011 and an MCU 2012. The power supply end of the voltage conversion module 2011 is used to connect to the power supply 205, the wake-up end of the voltage conversion module 2011 is connected to the second end of the wake-up circuit 202, the first output end of the voltage conversion module 2011 is connected to the power supply end of the MCU 2012, the second output end of the voltage conversion module 2011 is respectively connected to the input end of the clamp circuit 204 and the power supply end of the CC signal detection circuit 203, the second output end of the voltage conversion module 2011 is used to output a voltage signal of a first preset voltage value, and the first output end of the voltage conversion module 2011 is used to output a voltage signal of a second preset voltage value; the first control end of the MCU 2012 is connected to the control end of the clamp circuit 204, and the detection end of the MCU 2012 is connected to the output end of the CC signal detection circuit 203. The second control end of the MCU 2012 is connected to the second end of the eleventh resistor R11.

[0135] The voltage conversion module 2011 is a module that converts the voltage signal output by the power supply 205 into a voltage signal of a fixed preset voltage value. Specifically, the voltage signal output by the power supply 205 can be converted into a voltage signal of a first preset voltage value and output from the second output end of the voltage conversion module 2011, and the voltage signal output by the power supply 205 can be converted into a voltage signal of a second preset voltage value and output from the first output end of the voltage conversion module 2011.

[0136] After the wake-up circuit 202 wakes up the voltage conversion module 2011, the voltage conversion module 2011 is powered on and starts working. When the voltage conversion module 2011 is working, a voltage signal of a second preset voltage value is output from the first output end of the voltage conversion module 2011 to the power supply end of the MCU 2012, and the MCU 2012 is powered on and starts working. When the voltage conversion module 2011 is working, a voltage signal of a first preset voltage value is output from the second output end of the voltage conversion module 2011 to the input end of the clamp circuit 204 and the power supply end of the CC signal detection circuit 203. After the MCU 2012 is working, the clamp circuit 204 can be controlled to be turned on. In addition, the MCU 2012 can also determine whether the power output interface 207 is connected to the charging interface according to the level of the CC signal output by the CC signal detection circuit 203, that is, determine the connection status between the power output interface 207 and the charging interface. If MCU2012 determines that the charging interface and the power output interface 207 are half-connected, the clamp circuit 204 is controlled to be turned on and the NMOS tube Q5 is controlled to be turned on; if MCU2012 determines that the charging interface and the power output interface 207 are fully connected, the clamp circuit 204 is continuously controlled to be turned on and the NMOS tube Q5 is continuously controlled to be turned on; if MCU2012 determines that the charging interface and the power output interface 207 are not connected, the NMOS tube Q5 is controlled to be turned off and the clamp circuit 204 is controlled to be turned off.

[0137] Further, see Fig.12 The voltage conversion module 2011 includes a first power chip 2013 and a second power chip 2014. The first end of the first power chip 2013 is used to connect to the power supply 205, the wake-up end of the first power chip 2013 is connected to the second end of the wake-up circuit 202, the first output end of the first power chip 2013 is connected to the input end of the second power chip 2014, the output end of the second power chip 2014 is connected to the power end of the MCU 2012, and the second output end of the first power chip 2013 is connected to the input end of the clamp circuit 204 and the power supply end of the CC signal detection circuit 203 respectively.

[0138] The first power chip 2013 is used to convert the input voltage signal into a voltage signal of a first preset voltage value, and the first output terminal and the second output terminal of the first power chip 2013 are used to output the voltage signal of the first preset voltage value. The second power chip 2014 is used to convert the input voltage signal of the first preset voltage value into a voltage signal of a second preset voltage value, and the output terminal of the second power chip 2014 is used to output the voltage signal of the second preset voltage value. The first preset voltage value is different from the second preset voltage value.

[0139] It is worth noting that, when the first power chip 2013 converts the voltage signal output by the power supply 205 into a voltage signal of a first preset voltage value, the first output terminal of the first power chip 2013 outputs the voltage signal of the first preset voltage value to the second power chip 2014, and the second power chip 2014 converts the voltage signal of the first preset voltage value into a voltage signal of a second preset voltage value and outputs it to the MCU 2012 to supply power to the MCU 2012. In this way, the availability of the MCU 2012 can be guaranteed.

[0140] The first preset voltage value may be a voltage value that meets the power supply requirement of the operational amplifier U, and the second preset voltage value may be a voltage value that meets the power supply requirement of the MCU 2012. In a possible implementation, the first preset voltage value may be 5 volts, and the second preset voltage value may be 3.3 volts. Of course, the first preset voltage value and the second preset voltage value may also be other voltage values ​​that meet the corresponding power supply requirements, and the embodiment of the present application is not limited to this.

[0141] In the embodiment of the present application, when the control module 201 wakes up, due to the presence of the clamping circuit 204, it can be ensured that the voltage value of the voltage signal at the input end of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205, and it can also be ensured that the level of the CC signal outputted from the output end of the CC signal detection circuit 203 is not affected by the voltage change of the power supply 205. In this way, the control module 201 can accurately determine whether the power output interface 207 is connected to the charging interface. In addition, due to the presence of the first resistor R1, the predetermined voltage value clamped by the clamping circuit 204 can be divided, so that when the connection state of the charging interface and the power output interface 207 is different, the voltage value of the voltage signal at the input end of the CC signal detection circuit 203 is different, and the level of the CC signal outputted from the output end of the CC signal detection circuit 203 is also different. In this way, the reliability and accuracy of the control module 201 in determining the type of the power output interface 207 and the connection state of the charging interface and the power output interface 207 according to the level of the CC signal can be effectively guaranteed. Moreover, since the CC signal detection process of the CC signal processing system 200 in the embodiment of the present application is not affected by the voltage change of the power supply 205, it can be compatible with the voltage ranges of different low-voltage batteries of different vehicle models and can meet the detection of CC signals within a wider voltage range.

[0142] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A CC signal processing system, characterized in that: The system includes a control module, a wake-up circuit, a connection confirmation CC signal detection circuit, a clamping circuit and a first resistor; the clamping circuit includes a switch circuit and a first diode, and the second end of the switch circuit is connected to the positive electrode of the first diode; The power supply end of the control module and the first end of the wake-up circuit are both used to connect to the power supply; the wake-up end of the control module is connected to the second end of the wake-up circuit; the first control end of the control module is connected to the control end of the switch circuit to control the on or off of the clamp circuit; the output end of the control module is respectively connected to the first end of the switch circuit and the power supply end of the CC signal detection circuit, and the output end of the control module is used to output a voltage signal of a first preset voltage value; the detection end of the control module is connected to the output end of the CC signal detection circuit; the first end of the first resistor is respectively connected to the third end of the wake-up circuit and the cathode of the first diode, and the second end of the first resistor is connected to the first access point of the charging interface; The third end of the wake-up circuit, the output end of the clamping circuit and the first input end of the CC signal detection circuit are all connected to the first access point of the charging interface, the fourth end of the wake-up circuit and the second input end of the CC signal detection circuit are all connected to the second access point of the charging interface, and the first access point and the second access point of the charging interface are used to access the power output interface; when the power output interface is not connected to the charging interface, the second end of the wake-up circuit does not output a wake-up signal; when the power output interface is connected to the charging interface, the second end of the wake-up circuit outputs a wake-up signal to drive the control module to work.

2. The system according to claim 1, characterized in that The CC signal detection circuit is a differential sampling circuit.

3. The system according to claim 2, characterized in that The CC signal detection circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second diode and an operational amplifier; The first end of the second resistor is connected to the first access point of the charging interface, the second end of the second resistor is respectively connected to the first end of the third resistor, the positive electrode of the second diode and the non-inverting input terminal of the operational amplifier, the second end of the third resistor is connected to the ground wire, the negative electrode of the second diode and the positive power supply terminal of the operational amplifier are both connected to the output terminal of the control module, and the negative power supply terminal of the operational amplifier is connected to the ground wire; The first end of the fourth resistor is connected to the second access point of the charging interface, the second end of the fourth resistor is connected to the inverting input terminal of the operational amplifier, and the fifth resistor is connected between the inverting input terminal and the output terminal of the operational amplifier; the output terminal of the operational amplifier is connected to the detection terminal of the control module.

4. The system according to any one of claims 1 to 3, characterized in that: The wake-up circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first transistor and a P-type switch tube; The emitter of the first transistor is used to be connected to the power supply, the collector of the first transistor is connected to the wake-up end of the control module, the sixth resistor is connected between the emitter of the first transistor and the base of the first transistor, and the base of the first transistor is connected to the source of the P-type switch tube; The seventh resistor is connected between the source and the gate of the P-type switching tube, the gate of the P-type switching tube is connected to the first end of the eighth resistor, the second end of the eighth resistor is connected to the output end of the clamping circuit, the drain of the P-type switching tube is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the ground wire.

5. The system according to claim 4, characterized in that The system further includes a wake-up holding circuit, wherein the wake-up holding circuit includes an N-type switch tube, a tenth resistor, an eleventh resistor, and a twelfth resistor; The drain of the N-type switch tube is connected to the first end of the tenth resistor, the second end of the tenth resistor is connected to the base of the first transistor, the gate of the N-type switch tube is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the second control end of the control module, the twelfth resistor is connected between the source and the gate of the N-type switch tube, and the source of the N-type switch tube is connected to the ground wire.

6. The system according to claim 5, characterized in that After the control module wakes up, it is used to output a voltage signal of the first preset voltage value at the output end of the control module, and control the clamping circuit to be turned on; determine whether the power output interface is connected to the charging interface according to the level of the CC signal output by the CC signal detection circuit; if it is determined that the power output interface is connected to the charging interface, control the clamping circuit to be turned on and control the N-type switch tube to be turned on; if it is determined that the power output interface is not connected to the charging interface, control the N-type switch tube to be turned off and control the clamping circuit to be turned off.

7. The system according to any one of claims 1 to 3, characterized in that: The control module includes a voltage conversion module and a microcontroller unit MCU; The power supply end of the voltage conversion module is used to be connected to the power supply, the wake-up end of the voltage conversion module is connected to the second end of the wake-up circuit, the first output end of the voltage conversion module is connected to the power supply end of the MCU, the second output end of the voltage conversion module is respectively connected to the input end of the clamping circuit and the power supply end of the CC signal detection circuit, the second output end of the voltage conversion module is used to output the voltage signal of the first preset voltage value, and the first output end of the voltage conversion module is used to output the voltage signal of the second preset voltage value; The first control end of the MCU is connected to the control end of the clamp circuit, and the detection end of the MCU is connected to the output end of the CC signal detection circuit.

8. The system according to claim 7, characterized in that The voltage conversion module includes a first power chip and a second power chip; The first end of the first power chip is used to connect to the power supply, the wake-up end of the first power chip is connected to the second end of the wake-up circuit, the first output end of the first power chip is connected to the input end of the second power chip, the output end of the second power chip is connected to the power end of the MCU, and the second output end of the first power chip is respectively connected to the input end of the clamping circuit and the power supply end of the CC signal detection circuit; Among them, the first power supply chip is used to convert the input voltage signal into a voltage signal of the first preset voltage value, the first output end and the second output end of the first power supply chip are both used to output the voltage signal of the first preset voltage value, the second power supply chip is used to convert the input voltage signal of the first preset voltage value into a voltage signal of the second preset voltage value, and the output end of the second power supply chip is used to output the voltage signal of the second preset voltage value.

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