BMS wake-up circuit and electric vehicle

Abstract

The invention discloses a BMS wake-up circuit and an electric vehicle, and relates to the field of charging, and the BMS wake-up circuit is characterized in that a first end of a controllable switch module is connected with a power supply, a second end of the controllable switch module is connected with an enabling end of a power supply chip through a first capacitor module and a second capacitor module in sequence, and the controllable switch module is switched on when a charging gun is inserted; and when the charging of the first capacitor module is finished, the first capacitor module disconnects the first end and the second end of the first capacitor module, when the second capacitor module is fully charged, the second end of the second capacitor module outputs a wake-up signal and then discharges, and when the discharging is finished, the output of the wake-up signal is stopped. The discharging time of the second capacitor module is the same as the charging time of the electric vehicle, after the electric vehicle is charged, the second capacitor module stops outputting the wake-up signal, the power supply chip enters the dormant state, power supply is stopped, then the BMS is dormant, the lead-acid battery is not consumed any more, and the service life of the lead-acid battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of charging, and particularly to a BMS wake-up circuit and an electric vehicle. Background Art

[0002] After the electric vehicle finishes charging and the charging gun is not pulled out for a long time, the BMS (Battery Management System) of the electric vehicle cannot enter the sleep state, resulting in the BMS always being in the working state. The BMS itself consumes a large amount of power, consuming the lead-acid battery that powers the BMS. In the long term, it is easy to form a state of lead-acid power shortage, affecting the service life of the lead-acid battery and the low-voltage power consumption system of the entire vehicle. Summary of the Invention

[0003] The purpose of the present invention is to provide a BMS wake-up circuit and an electric vehicle. The discharge time of the second capacitor module is the same as the charging time of the electric vehicle. After the electric vehicle finishes charging, the second capacitor module stops outputting the wake-up signal, and then the power supply chip enters the sleep state and stops power supply. Then the BMS enters the sleep state and no longer consumes the lead-acid battery, improving the service life of the lead-acid battery.

[0004] To solve the above technical problems, the present invention provides a BMS wake-up circuit, including a controllable switch module, a first capacitor module, a second capacitor module, and a power supply chip:

[0005] The first end of the controllable switch module is connected to the power supply. The control end of the controllable switch module is connected to the first end of the grounding resistor of the charging gun when the charging gun is inserted. The second end of the grounding resistor is grounded. The second end of the controllable switch module is connected to the first end of the first capacitor module. The second end of the first capacitor module is connected to the first end of the second capacitor module. The second end of the second capacitor module is connected to the enable end of the power supply chip;

[0006] The controllable switch module is used to conduct the connection between its first end and second end when the charging gun is inserted. The first capacitor module and the second capacitor module are used to charge when the controllable switch module is conducting. When the first capacitor module finishes charging, the first capacitor module disconnects its first end and second end. When the second capacitor module is fully charged, it outputs a wake-up signal through the second end of the second capacitor module, and then enters the discharge process. When the discharge ends, it stops outputting the wake-up signal. The discharge time of the second capacitor module is the same as the charging time of the electric vehicle. The power supply chip is used to supply power to the controller of the BMS when receiving the wake-up signal and enter the sleep state when not receiving the wake-up signal.

[0007] On the other hand, the controllable switch module includes a first resistor and a first controllable switch;

[0008] The first end of the first resistor is connected to the first end of the first controllable switch, and the common connection end is connected to the power supply. The second end of the first resistor is connected to the control end of the first controllable switch, and the common connection end is connected to the wake-up signal of the charging gun. The second end of the first controllable switch is connected to the first end of the first capacitor module;

[0009] The first controllable switch is used to conduct when the wake-up signal is input, and the first resistor is used for voltage division.

[0010] On the other hand, the controllable switch module further includes a first diode;

[0011] The anode of the first diode is connected to the second end of the first resistor, and the cathode of the first diode is connected to the wake-up signal of the charging gun;

[0012] The first diode is used to prevent the external voltage connected to the charging gun from flowing back.

[0013] On the other hand, it further includes a second diode;

[0014] The anode of the second diode is connected to the second end of the first capacitor module, and the cathode of the second diode is connected to the first end of the second capacitor module;

[0015] The second diode is used to prevent the current of the second capacitor module from flowing back to the first capacitor module.

[0016] On the other hand, the first capacitor module includes a first capacitor and a second resistor;

[0017] The first end of the first capacitor is connected to the second end of the controllable switch module. The second end of the first capacitor is respectively connected to the first end of the second capacitor module and the first end of the second resistor, and the second end of the second resistor is grounded;

[0018] The first capacitor is used to charge itself first and then charge the second capacitor module when the first end and the second end of the controllable switch module are conducting. The second resistor is used to release the electric energy stored in the first capacitor.

[0019] On the other hand, the first capacitor module further includes a third diode;

[0020] The anode of the third diode is grounded, and the cathode of the third diode is connected to the first end of the first capacitor;

[0021] The third diode is used to discharge the first capacitor.

[0022] On the other hand, the second capacitor module includes a second capacitor and a third resistor;

[0023] The first end of the second capacitor is respectively connected to the first end of the third resistor and the second end of the first capacitor module, and the second end of the second capacitor is connected to the second end of the third resistor, and the common connection end is grounded;

[0024] The second capacitor is used to output a wake-up signal through its second end when it is fully charged, and then enters a discharging process, and stops outputting the wake-up signal when its discharging ends. The third resistor is used to discharge the second capacitor.

[0025] On the other hand, it further includes a sampling module, and the sampling module includes a fourth resistor and a fifth resistor;

[0026] The first end of the fourth resistor is connected to the sampling end of the controller of the BMS, the second end of the fourth resistor is connected to the second end of the fifth resistor, and the common connection end is connected to the first wake-up signal of the charging gun, and the first end of the fifth resistor is connected to the reference power supply;

[0027] The fourth resistor and the fifth resistor are used to sample the voltage value of the first wake-up signal, so that the controller of the BMS can determine the function corresponding to the first wake-up signal, and the functions include charging and communication.

[0028] On the other hand, the sampling module further includes a fourth diode;

[0029] The anode of the fourth diode is connected to the second end of the fourth resistor, and the cathode of the fourth diode is connected to the first wake-up signal of the charging gun;

[0030] The fourth diode is used to prevent the power supply from flowing back to the sampling end of the controller of the BMS.

[0031] To solve the above technical problems, the present invention further provides an electric vehicle, including the above BMS wake-up circuit.

[0032] The present invention discloses a BMS wake-up circuit and an electric vehicle, relating to the charging field, including: the first end of a controllable switch module is connected to a power supply, the second end of the controllable switch module is sequentially connected to an enabling end of a power chip through a first capacitor module and a second capacitor module, the controllable switch module conducts when the charging gun is inserted, and then the first capacitor module and the second capacitor module are charged. When the first capacitor module finishes charging, the first capacitor module disconnects its first end from its second end. When the second capacitor module is fully charged, a wake-up signal is output through the second end of the second capacitor module, and then discharges, and stops outputting the wake-up signal when the discharging ends. The discharging time of the second capacitor module is the same as the charging time of the electric vehicle. After the electric vehicle finishes charging, the second capacitor module stops outputting the wake-up signal, the power chip enters a sleep state, stops power supply, and then the BMS goes to sleep and no longer consumes the lead-acid battery, improving the service life of the lead-acid battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the prior art and the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of a BMS wake-up circuit provided by the present invention;

[0035] Figure 2 It is another schematic structural diagram of a BMS wake-up circuit provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The core of the present invention is to provide a BMS wake-up circuit and an electric vehicle. The discharge time of the second capacitor module is the same as the charging time of the electric vehicle. After the electric vehicle is fully charged, the second capacitor module stops outputting the wake-up signal, and then the power supply chip enters the sleep state and stops power supply. Then the BMS goes to sleep and no longer consumes the lead-acid battery, improving the service life of the lead-acid battery.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] Figure 1 It is a schematic structural diagram of a BMS wake-up circuit provided by the present invention. The BMS wake-up circuit includes a controllable switch module 1, a first capacitor module 2, a second capacitor module 3, and a power supply chip 4:

[0039] The first end of the controllable switch module 1 is connected to the power supply. The control end of the controllable switch module 1 is connected to the first end of the grounding resistor of the charging gun when the charging gun is inserted. The second end of the grounding resistor is grounded. The second end of the controllable switch module 1 is connected to the first end of the first capacitor module 2. The second end of the first capacitor module 2 is connected to the first end of the second capacitor module 3. The second end of the second capacitor module 3 is connected to the enable end of the power supply chip 4;

[0040] The controllable switch module 1 is used to conduct the connection between its first end and second end when the charging gun is inserted. The first capacitor module 2 and the second capacitor module 3 are used to charge when the controllable switch module 1 is conducting. When the charging of the first capacitor module 2 is completed, the first capacitor module 2 disconnects its first end and second end. When the second capacitor module 3 is fully charged, a wake-up signal is output through the second end of the second capacitor module 3, and then it enters the discharge process. When the discharge is completed, the wake-up signal output stops. The discharge time of the second capacitor module 3 is the same as the charging time of the electric vehicle. The power supply chip 4 is used to supply power to the controller of the BMS when it receives the wake-up signal and goes into sleep when it does not receive the wake-up signal.

[0041] The fast charge wake-up interface CC2 signal is a 1kΩ grounding resistor R CC2 , when the charging gun is inserted, the controllable switch module 1 conducts, and then the power supply U1 charges the first capacitor module 2. After the first capacitor module 2 is fully charged, it charges the second capacitor module 3. After the second capacitor module 3 is fully charged and the first capacitor module 2 is also fully charged, the potentials at both ends of the first capacitor module 2 are balanced, and the first capacitor module 2 can be regarded as an open circuit. At this time, the second capacitor module 3 can only start to discharge and then output to the power supply chip 4, and the enable terminal of the power supply chip 4 gets powered, so the power supply chip 4 supplies power to the controller of the BMS.

[0042] Furthermore, the discharge time of the second capacitor module 3 is set according to the charging time of the electric vehicle, which can ensure that the power supply chip 4 is powered during the charging process of the electric vehicle. At the same time, the discharge is ended as much as possible when the electric vehicle's charging is completed. The discharge time of the second capacitor module 3 can be determined according to the capacitance value of the second capacitor module 3.

[0043] After the charging of the electric vehicle is completed, the second capacitor module 3 also ends its discharge. At this time, the power supply chip 4 loses power and stops supplying power to the controller of the BMS. In this way, the BMS enters the sleep state and no longer consumes the lead-acid battery that supplies power to the BMS, thereby improving the service life of the lead-acid battery.

[0044] The present invention discloses a BMS wake-up circuit, which relates to the charging field and includes: the first end of the controllable switch module 1 is connected to the power supply, the second end of the controllable switch module 1 is sequentially connected to the enable end of the power supply chip 4 through the first capacitor module 2 and the second capacitor module 3. The controllable switch module 1 conducts when the charging gun is inserted. Then, the first capacitor module 2 and the second capacitor module 3 are charged. When the first capacitor module 2 finishes charging, the first capacitor module 2 disconnects its first end from its second end. When the second capacitor module 3 is fully charged, a wake-up signal is output through the second end of the second capacitor module 3, and then it discharges. When the discharging ends, the wake-up signal output stops. The discharging time of the second capacitor module 3 is the same as the charging time of the electric vehicle. After the electric vehicle finishes charging, the second capacitor module 3 stops outputting the wake-up signal, the power supply chip 4 enters the sleep state and stops power supply. Then, the BMS goes to sleep, no longer consuming the lead-acid battery, and improving the service life of the lead-acid battery.

[0045] Based on the above embodiments:

[0046] In some embodiments, the controllable switch module 1 includes a first resistor R1 and a first controllable switch Q1;

[0047] The first end of the first resistor R1 is connected to the first end of the first controllable switch Q1, and the common connection end is connected to the power supply U1. The second end of the first resistor R1 is connected to the control end of the first controllable switch Q1, and the common connection end is connected to the wake-up signal of the charging gun. The second end of the first controllable switch Q1 is connected to the first end of the first capacitor module 2;

[0048] The first controllable switch Q1 is used to conduct when the wake-up signal is input, and the first resistor R1 is used for voltage division.

[0049] After the charging gun is inserted, the voltage after voltage division by the first resistor R1 is output to the control end of the first controllable switch Q1. Based on the connection relationship of the first controllable switch Q1, the first controllable switch Q1 is a PNP type triode, and the control end is of the type that conducts when the level is low. When the charging gun is inserted, the resistor R CC2 is grounded to achieve voltage division, the first controllable switch Q1 conducts, and the power supply U1 starts to supply power to the first capacitor module 2.

[0050] In some embodiments, the controllable switch module 1 further includes a first diode D1;

[0051] The anode of the first diode D1 is connected to the second end of the first resistor R1, and the cathode of the first diode D1 is connected to the wake-up signal of the charging gun;

[0052] The first diode D1 is used to prevent the external voltage connected to the charging gun from flowing back.

[0053] Considering that there may be current interference from the outside to the power supply U1, which may affect the conduction of the first controllable switch Q1, a first diode D1 is provided to prevent reverse connection and prevent external current from flowing back.

[0054] In some embodiments, it further includes a second diode D2;

[0055] The anode of the second diode D2 is connected to the second end of the first capacitor module 2, and the cathode of the second diode D2 is connected to the first end of the second capacitor module 3;

[0056] The second diode D2 is used to prevent the current of the second capacitor module 3 from flowing back to the first capacitor module 2.

[0057] Considering that the first capacitor module 2 first charges itself and then charges the second capacitor module 3. If the second capacitor module 3 can charge the first capacitor module 2, the charging time of the first capacitor module 2 will become longer, and the power supply U1 cannot be disconnected in time, which will further lead to an extended working time of the BMS and inability to enter the sleep state in time.

[0058] In some embodiments, the first capacitor module 2 includes a first capacitor C1 and a second resistor R2;

[0059] The first end of the first capacitor C1 is connected to the second end of the controllable switch module 1, the second end of the first capacitor C1 is respectively connected to the first end of the second capacitor module 3 and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded;

[0060] The first capacitor C1 is used to charge itself first when the controllable switch module 1 conducts its first end and second end, and then charge the second capacitor module 3. The second resistor R2 is used to release the electric energy stored in the first capacitor C1.

[0061] It should be noted that after the potentials at both ends of the first capacitor C1 are balanced, the first capacitor C1 is regarded as an open circuit, the power supply U1 is cut off, at this time the charging of the second capacitor module 3 ends and starts to discharge, and the first capacitor C1 also needs to discharge, so the second resistor R2 is provided to discharge the first capacitor C1.

[0062] In some embodiments, the first capacitor module 2 further includes a third diode D3;

[0063] The anode of the third diode D3 is grounded, and the cathode of the third diode D3 is connected to the first end of the first capacitor C1;

[0064] The third diode D3 is used to discharge the first capacitor C1.

[0065] The setting of the third diode D3 can assist the first capacitor C1 to discharge, enabling the first capacitor C1 to release the electric energy stored in itself faster.

[0066] In some embodiments, the second capacitor module 3 includes a second capacitor C2 and a third resistor R3;

[0067] A first end of the second capacitor C2 is respectively connected to a first end of the third resistor R3 and a second end of the first capacitor module 2, and a second end of the second capacitor C2 is connected to a second end of the third resistor R3, and a common connection end thereof is grounded;

[0068] The second capacitor C2 is configured to output a wake-up signal through its second end when it is fully charged, and then enter a discharging process, and stop outputting the wake-up signal when its discharging ends. The third resistor R3 is configured to discharge the second capacitor C2.

[0069] When the charging of the second capacitor C2 ends, the second capacitor C2 starts to discharge. The second capacitor C2 discharges through the third resistor R3 until the electricity of the second capacitor C2 is discharged to 0V. At this time, the wake-up enable signal of the power supply chip 4 becomes 0V, and the power supply chip 4 can enter the sleep state autonomously.

[0070] In some embodiments, a sampling module is further included. The sampling module includes a fourth resistor R4 and a fifth resistor R5;

[0071] A first end of the fourth resistor R4 is connected to a sampling end of a controller of the BMS. A second end of the fourth resistor R4 is connected to a second end of the fifth resistor R5, and a common connection end thereof is connected to a first wake-up signal of a charging gun. A first end of the fifth resistor R5 is connected to a reference power supply U2;

[0072] The fourth resistor R4 and the fifth resistor R5 are configured to sample a voltage value of the first wake-up signal, so that the controller of the BMS can determine functions corresponding to the first wake-up signal. The functions include charging and communication.

[0073] Considering that there are different functions for waking up the BMS, it may be necessary to charge or there may be a communication requirement. At this time, it can be determined according to the voltage value corresponding to the wake-up signal. By the voltage division of the fourth resistor R4, the fifth resistor R5 and a grounding resistor, the value of the voltage U3 output to the sampling end is determined.

[0074] In some embodiments, the sampling module further includes a fourth diode D4;

[0075] An anode of the fourth diode D4 is connected to a second end of the fourth resistor R4, and a cathode of the fourth diode D4 is connected to the first wake-up signal of the charging gun;

[0076] The fourth diode D4 is configured to prevent the power supply U1 from flowing back to the sampling end of the controller of the BMS.

[0077] Furthermore, in order to prevent the power supply U1 from flowing back to the sampling port of the controller, the fourth diode D4 is provided for preventing reverse connection.

[0078] Specifically, the sampling calculation formula is as follows:

[0079] ;

[0080] UD1 is the conduction voltage drop of the first diode D1, UD4 is the conduction voltage drop of the fourth diode D4, R1 is the resistance value of the first resistor R1, R5 is the resistance value of the fifth resistor R5, and R CC2 is the resistance value of the grounding resistor.

[0081] The present application also provides an electric vehicle, including the above-mentioned BMS wake-up circuit.

[0082] For the introduction of the electric vehicle provided by the present application, please refer to the above-mentioned embodiments, and details will not be repeated here.

[0083] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, article or device including the said element.

[0084] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can 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 is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A BMS wake-up circuit, characterized in that: It includes a controllable switch module, a first capacitor module, a second capacitor module and a power chip: The first end of the controllable switch module is connected to the power supply, the control end of the controllable switch module is connected to the first end of the grounding resistor of the charging gun when the charging gun is inserted, the second end of the grounding resistor is grounded, the second end of the controllable switch module is connected to the first end of the first capacitor module, the second end of the first capacitor module is connected to the first end of the second capacitor module, and the second end of the second capacitor module is connected to the enable end of the power chip; The controllable switch module is used to connect its first end and second end when the charging gun is inserted. The first capacitor module and the second capacitor module are used to charge when the controllable switch module is turned on. When the charging of the first capacitor module is completed, the first capacitor module disconnects its first end and second end. When the second capacitor module is fully charged, a wake-up signal is output through the second end of the second capacitor module, and then the discharge process is entered. When the discharge is completed, the wake-up signal is stopped from being output. The discharge time of the second capacitor module is the same as the charging time of the electric vehicle. The power chip is used to power the BMS controller when the wake-up signal is received, and to sleep when the wake-up signal is not received.

2. The BMS wake-up circuit according to claim 1, characterized in that: The controllable switch module includes a first resistor and a first controllable switch; The first end of the first resistor is connected to the first end of the first controllable switch, and the common end of the connection is connected to the power supply, the second end of the first resistor is connected to the control end of the first controllable switch, and the common end of the connection is connected to the wake-up signal of the charging gun, and the second end of the first controllable switch is connected to the first end of the first capacitor module; The first controllable switch is used to be turned on when the wake-up signal is input, and the first resistor is used for voltage division.

3. The BMS wake-up circuit according to claim 2, characterized in that: The controllable switch module also includes a first diode; The anode of the first diode is connected to the second end of the first resistor, and the cathode of the first diode is connected to the wake-up signal of the charging gun; The first diode is used to prevent the external voltage connected to the charging gun from flowing back.

4. The BMS wake-up circuit according to claim 1, characterized in that: Also including a second diode; An anode of the second diode is connected to the second end of the first capacitor module, and a cathode of the second diode is connected to the first end of the second capacitor module; The second diode is used to prevent the current of the second capacitor module from flowing back to the first capacitor module.

5. The BMS wake-up circuit according to claim 1, characterized in that: The first capacitor module includes a first capacitor and a second resistor; The first end of the first capacitor is connected to the second end of the controllable switch module, the second end of the first capacitor is respectively connected to the first end of the second capacitor module and the first end of the second resistor, and the second end of the second resistor is grounded; The first capacitor is used to charge itself first and then charge the second capacitor module when the controllable switch module conducts the first end and the second end, and the second resistor is used to release the electrical energy stored in the first capacitor.

6. The BMS wake-up circuit according to claim 5, characterized in that: The first capacitor module also includes a third diode; An anode of the third diode is grounded, and a cathode of the third diode is connected to a first end of the first capacitor; The third diode is used to discharge the first capacitor.

7. The BMS wake-up circuit according to claim 1, characterized in that: The second capacitor module includes a second capacitor and a third resistor; The first end of the second capacitor is connected to the first end of the third resistor and the second end of the first capacitor module respectively, the second end of the second capacitor is connected to the second end of the third resistor, and the common end of the connections is grounded; The second capacitor is used to output a wake-up signal through its second end when it is fully charged, and then enter a discharge process, and stop outputting the wake-up signal when its own discharge ends. The third resistor is used to discharge the second capacitor.

8. The BMS wake-up circuit according to any one of claims 1 to 7, characterized in that: Also includes a sampling module, the sampling module includes a fourth resistor and a fifth resistor; The first end of the fourth resistor is connected to the sampling end of the controller of the BMS, the second end of the fourth resistor is connected to the second end of the fifth resistor, and the common end of the connected resistors is connected to the first wake-up signal of the charging gun, and the first end of the fifth resistor is connected to the reference power supply; The fourth resistor and the fifth resistor are used to sample the voltage value of the first wake-up signal so that the controller of the BMS determines the function corresponding to the first wake-up signal, and the function includes charging and communication.

9. The BMS wake-up circuit according to claim 8, characterized in that: The sampling module also includes a fourth diode; An anode of the fourth diode is connected to the second end of the fourth resistor, and a cathode of the fourth diode is connected to the first wake-up signal of the charging gun; The fourth diode is used to prevent the power supply from flowing back to the sampling terminal of the controller of the BMS.

10. An electric vehicle, characterized in that: The method comprises the BMS wake-up circuit as claimed in any one of claims 1 to 9.

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