Relay control circuit, relay control system, relay control chip, relay control equipment and electric vehicle

Abstract

The utility model discloses a relay control circuit, a relay control system, a relay control chip, relay control equipment and an electric vehicle. The relay control circuit comprises a latch control sub-circuit and a high-side driving sub-circuit. The latch control sub-circuit is used for transmitting, latching or resetting based on an original control signal to obtain a latch control signal. And the high-side driving sub-circuit is used for controlling the on-off of the driving power supply and the relay coil based on the latch control signal so as to control the on or off of the relay. And the latch control sub-circuit controls the latch output end to close the output after confirming that the system power supply is powered on again through the system energy supply end, and starts the output of the latch output end after the original control signal is reset, so that the control signal is latched at a second level. By means of the circuit, misoperation of the relay can be effectively avoided, high efficiency and stability of relay control are facilitated, and then the safety and comfort of electric vehicle driving are improved.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a relay control circuit, system, chip, device and electric vehicle. Background Art

[0002] With the development of new energy, semiconductor and autonomous driving technologies, the global automotive industry is continuously transforming towards electrification, and the number of electric vehicles in use continues to rise. In electric vehicles, relays are needed to switch the power supply status to control the connection between the battery pack and the high-voltage load, so as to control the working status of the electric vehicle's motor drive and battery management systems, thereby ensuring the safe and stable operation of electric vehicles.

[0003] The traditional control method of relays is mainly based on high-side drive control circuits or low-side drive control circuits. Among them, the high-side drive control circuit is used to control the drive power supply to achieve more precise drive control, has better drive capability, and is more widely used in electric vehicles.

[0004] However, the existing high-side drive control circuit usually has problems such as electromagnetic interference, heating and insufficient driving. It is necessary to set up an additional isolation circuit to ensure the isolation between the control signal and the driving power supply to reduce the impact of electromagnetic interference, and to reduce the heating problem caused by its high power consumption through heat dissipation measures, and provide a stable driving signal to ensure that the high-side drive control circuit meets the requirements of driving capability. Although these influencing factors have been processed, it has also led to an increase in the complexity of its circuit structure and an increase in cost. At the same time, the problems of low control efficiency and poor compatibility of the existing high-side drive circuit still need to be solved urgently. In the event of power failure and control signal reset, it is easy to cause malfunctions such as frequent relay jumping or even control failure, causing fluctuations and interference to the electric vehicle system, which is not conducive to the effectiveness and stability of relay control, and also has an adverse effect on driving safety and comfort. Utility Model Content

[0005] The present application mainly provides a relay control circuit, system, chip, device and electric vehicle, aiming to solve the technical problem of low control efficiency of existing relay control circuits.

[0006] In order to solve the above technical problems, the technical solution adopted in the present application is: to provide a relay control circuit. The relay control circuit includes: a latch control subcircuit, the data input end of the latch control subcircuit is connected to the original control signal, the system power supply end of the latch control subcircuit is connected to the system power supply, and the latch output end of the latch control subcircuit outputs a latch control signal for transmitting, latching or resetting based on the original control signal to obtain the latch control signal; a high-side drive subcircuit, the drive control end of the high-side drive subcircuit is connected to the latch output end of the latch control subcircuit, the drive input end of the high-side drive subcircuit is connected to the drive power supply, and the drive output end of the high-side drive subcircuit is connected to the relay coil for base The latch control signal controls the on and off of the driving power supply and the relay coil to control the connection or disconnection of the relay; wherein the original control signal is sent by the processor to instruct the control relay to be connected or disconnected; when the latch control signal is at a first level, the relay is controlled to be connected, and when the latch control signal is at a second level, the control relay is disconnected; after the latch control subcircuit confirms that the system power supply is powered on again through the system power supply end, the latch output end is controlled to turn off the output, and the output of the latch output end is turned on after the original control signal is reset to output the latch control signal of the second level.

[0007] In some embodiments, the latch control subcircuit includes a latch chip and a delay unit; the latch chip includes an output enable terminal, the data input terminal, the system power supply terminal and the latch output terminal; the output enable terminal is connected to the output terminal of the delay unit, and the delay unit is powered by the system power supply; wherein, after the latch chip confirms that the system power supply is powered on again based on the system power supply terminal, the output enable terminal controls the latch output terminal to turn off the output for a preset period of time based on the delay unit, and within the preset period of time, the latch chip controls the latch control signal to be reset, and after the preset period of time, outputs the latch control signal of the second level that controls the drive power supply to be disconnected from the relay coil.

[0008] In some embodiments, the delay unit includes a first resistor, a second resistor, a third resistor, a capacitor and a MOS tube; the first end of the first resistor is connected to the system power supply, the second end of the first resistor is connected to the drain of the MOS tube, the source of the MOS tube is grounded, the gate of the MOS tube is connected to the first end of the third resistor, the second end of the third resistor is connected to the system power supply, the first end of the second resistor and the first end of the capacitor are both coupled between the gate of the MOS tube and the first end of the third resistor, and the second end of the second resistor and the second end of the capacitor are both grounded; the output enable end is coupled between the second end of the first resistor and the drain of the MOS tube.

[0009] In some embodiments, the latch control subcircuit also includes a latch enable terminal; when the latch chip confirms that the processor is reset based on the original control signal, the latch enable terminal controls the latch chip to latch to maintain the latch control signal the same as the latch control signal before the processor is reset.

[0010] In some embodiments, when the latch enable terminal and the output enable terminal are both at valid levels, the latch control subcircuit is used to transmit the original control signal, and the latch control signal is at the same level as the input original control signal; when the output enable terminal is at a valid level and the latch enable terminal is at an invalid level, the latch control subcircuit is used to latch the original control signal, and the latch control signal maintains the first level or the second level of the original control signal transmitted last time; when the output enable terminal is at an invalid level, the latch control subcircuit controls the latch output terminal to turn off the output.

[0011] In some embodiments, the high-side drive subcircuit includes a high-side drive switch and a diode; the high-side drive switch includes the drive input terminal, the drive control terminal and the drive output terminal, the drive output terminal is connected to the cathode of the diode, and the anode of the diode is grounded.

[0012] In order to solve the above technical problems, another technical solution adopted in the present application is: providing a relay control system, which includes a processor, a relay coil and a relay control circuit as mentioned above; the control signal output end of the processor is connected to the data input end of the latch control subcircuit in the relay control circuit; the drive output end of the high-side drive subcircuit of the relay control circuit is connected to the relay control port of the relay coil.

[0013] In order to solve the above technical problem, another technical solution adopted in the present application is: to provide a power chip, which includes the relay control circuit as mentioned above.

[0014] In order to solve the above technical problem, another technical solution adopted by the present application is: to provide a vehicle-mounted device, which includes the power chip as mentioned above.

[0015] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electric vehicle, which includes the power chip as mentioned above or the power chip as mentioned above.

[0016] The beneficial effects of the present application are: different from the prior art, the present application discloses a relay control circuit, system, chip, device and electric vehicle. The present application adds a latch control subcircuit before the high-side drive subcircuit in the relay control circuit to transmit, latch or reset the original control signal used to indicate whether the control relay is connected or disconnected, so as to transmit the original control signal to control the high-side drive subcircuit when the system is operating normally, and reset the original control signal when the system is powered on again, so as to output a latch control signal for controlling the high-side drive subcircuit to disconnect, so as to disconnect the relay, thereby avoiding the electric vehicle being out of control and electric shock accidents caused by the relay still being locked in the attracted state after power is turned on again. In addition, when the processor is reset, the latch control subcircuit can also make the latch control signal it outputs the same as the latch control signal before the processor is reset, so as to avoid the fault caused by the frequent switching of the relay state caused by the software reset and the adverse effect on driving comfort and smoothness. The use of the circuit in relay control has good efficiency, stability and reliability, and is relatively simple in circuit design. The realization of the latch function is conducive to reducing system power consumption, facilitating the control and management of the connection or disconnection of the relay, and is conducive to improving the safety, comfort and reliability of electric vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a relay control circuit provided by the present application;

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of an embodiment of a latch control subcircuit 200 in the embodiment;

[0020] Figure 3 yes Figure 2 A schematic diagram of the structure of an embodiment of the delay unit 220 in the embodiment;

[0021] Figure 4 yes Figure 1 A schematic structural diagram of another embodiment of the latch control subcircuit 200 in the embodiment;

[0022] Figure 5 yes Figure 1 A schematic structural diagram of an embodiment of a high-side driver sub-circuit 300 in the embodiment;

[0023] Figure 6 It is a structural schematic diagram of an embodiment of a relay control system provided by the present application;

[0024] Figure 7 It is a structural schematic diagram of an embodiment of a power chip provided by the present application;

[0025] Figure 8 It is a structural schematic diagram of an embodiment of the vehicle-mounted device provided by the present application;

[0026] Fig. 9 It is a structural schematic diagram of an embodiment of an electric vehicle provided by the present application. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The terms "first", "second", "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the feature defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The present application provides a relay control circuit, referring to Figure 1 , Figure 1 1 is a schematic diagram of a structure of an embodiment of a relay control circuit provided by the present application. The relay control circuit 100 includes:

[0031] The latch control subcircuit 200 has a data input terminal D connected to the original control signal, a system power supply terminal VCC connected to the system power supply, and a latch output terminal Q of the latch control subcircuit 200 outputs a latch control signal for transmitting, latching or resetting based on the original control signal to obtain a latch control signal.

[0032] A high-side driving sub-circuit 300, wherein a driving control terminal IN of the high-side driving sub-circuit 300 is connected to a latch output terminal Q of a latch control sub-circuit 200, a driving input terminal VBB of the high-side driving sub-circuit 300 is connected to a driving power supply, and a driving output terminal OUT of the high-side driving sub-circuit 300 is connected to a relay coil, for controlling the on and off of the driving power supply and the relay coil based on a latch control signal, so as to control the relay to be connected or disconnected.

[0033] Among them, the original control signal is sent by the processor, indicating whether the control relay is connected or disconnected. When the latch control signal is at the first level, the control relay is connected, and when the latch control signal is at the second level, the control relay is disconnected; after the latch control subcircuit 200 confirms that the system power is powered on again through the system power supply terminal VCC, the latch output terminal Q is controlled to turn off the output, and the output of the latch output terminal Q is turned on after the original control signal is reset to output a latch control signal of the second level.

[0034] The original control signal is an indication signal sent by the processor, which is a signal data sent by the user through a hardware device or software instructions according to the actual control requirements. For example, during the driving process of an electric vehicle, a relay controls the connection or disconnection of the motor load and a battery pack to achieve vehicle acceleration or non-acceleration. When the user needs to accelerate, the accelerator pedal or other acceleration controls are used to send an original control signal intended to indicate that the relay is connected through subsequent signal processing or control algorithms, and when the user does not need to accelerate, the brake or other deceleration controls are linked to send an original control signal intended to indicate that the relay is disconnected through subsequent signal processing or control algorithms. The original control signal can be triggered by the processor according to the physical trigger button or computer control and instruction selected by the user. The processor can be a microcontroller unit (MCU), a central processing unit (CPU) and a system-on-chip (SoC), etc. This application does not make specific restrictions on this.

[0035] The system power supply is the power supply for the relay control circuit 100 and its components, which is usually directly obtained from an analog power supply, an external power-on interface, etc., or converted by a voltage regulator, a step-down converter, etc. In the relay control circuit 100, it is usually 3.3V, 5V or 10V, etc., and can be appropriately adjusted according to different power supply requirements, or additional voltage conversion circuits can be added to provide multiple power supplies to meet the power supply requirements of different components.

[0036] The driving power supply is the power supply that provides current to the relay coil. When the coil current is sufficient, the relay attracts the battery core based on electromagnetic induction to achieve conduction, and is disconnected when the coil current is insufficient. The voltage or current value provided by the driving power supply is usually high, and a DC power supply with a volt value of 9V, 12V or 24V is commonly used as the driving power supply.

[0037] The latch control subcircuit 200 is a circuit structure with the function of transmitting, latching or resetting the original control signal. The latch control subcircuit 200 can be some specific latches that can realize the corresponding transmission, latching and resetting functions, or a circuit driven by a learning model obtained by training a neural network according to the characteristics of the original control signal, the label of the corresponding scenario and the expected result, or a circuit structure designed and constructed based on traditional logic gate circuits, storage elements and basic items. The latch control subcircuit 200 can realize the transmission, latching or resetting functions of the original control signal and generate the corresponding latch control signal.

[0038] Among them, the latch control subcircuit 200 can be controlled and logically operated by digital signals, so it is necessary to set or receive corresponding levels at different ports and process them for different levels. The level signal is usually divided into a high level and a low level, and the specific values ​​of the high level and the low level depend on the parameter requirements of the circuit and some related devices, such as the usual high level is 3V to 5V, and the low level is usually 0 to 0.25V. Therefore, the first level and the second level of the latch control signal output by the latch control subcircuit 200 of the present application are respectively one of them, such as the first level is a high level, the second level is a low level, or the first level is a low level, and the second level is a high level. It can be specifically determined for the selection and setting of related devices and structures in different latch control subcircuits 200.

[0039] The original control signal is transmitted, that is, the corresponding indication of the original control signal is kept unchanged. For example, when the original control signal is intended to control the relay to be disconnected through the high-side drive subcircuit 300, the corresponding latch control signal also needs to be able to control the relay to be disconnected. If the original control signal is intended to control the relay to be connected through the high-side drive subcircuit 300, the corresponding latch control signal can also control the relay to be connected. In the case of transmission, the latch control signal and the original control signal can be consistent, or the original control signal can be enhanced or reduced, or the original control signal can be converted to a certain extent according to the requirements of different high-side drive subcircuits 300 for the drive control terminal IN signal. As long as the original control signal can be maintained to control the latch control subcircuit 200, it is within the protection scope of the present application.

[0040] In addition, since the latch control subcircuit 200 usually has a latching effect on the signal during the transmission process, it can maintain a continuous latched output when it outputs, that is, when an original control signal is received, the output of the corresponding latch control signal can be maintained until a new original control signal is received. Therefore, when the latch control subcircuit 200 is used, there is no need to continuously power the latch control circuit to maintain its output state, thereby achieving a stable output to the high-side drive subcircuit 300 to maintain the state of the relay, which can effectively reduce power consumption. This can effectively, stably and reliably control the relay when long-term operation or energy saving is required.

[0041] The latching of the original control signal is to latch the latched control signal as the indication corresponding to the original control signal after receiving the original control signal until the signal reset is completed or a new original control signal is received. This latching function can ensure that the latching control subcircuit 200 can still maintain its output state when the original control signal disappears or is interrupted, thereby keeping the state of the relay unchanged.

[0042] Resetting the original control signal means placing the original control signal at a high level or a low level, which is a level signal of the control relay being disconnected in the original state, i.e., a second level. The reset function of the latch control subcircuit 200 is applied to the situation where the system power supply proposed in this scheme is powered on again. When the system power supply is powered off or the system is restarted, the system power supply will be powered on again. Due to reasons such as the system responding too fast or the high-side drive subcircuit 300 being too sensitive, the relay is energized at startup. When a latch with transmission and latching functions is used, the corresponding level is easily locked before power failure due to the locking effect of the latch, and the level of the control relay being locked will appear. This can easily lead to uncontrollable surges in the components of the electric vehicle, damage its performance, and reduce the effectiveness of the control of the electric vehicle. At the same time, after the system power supply is powered on, the corresponding anti-electric shock measures may not be activated in time, resulting in electric shock accidents.

[0043] In order to avoid the above-mentioned malfunction and the electric shock accidents that may be caused, the latch control subcircuit 200 provided in this solution is particularly equipped with a reset function. After confirming that the power is turned on again, the latch control subcircuit 200 can control the output of the latch output terminal Q. The realization of this function can be achieved by setting a corresponding trigger switch at the output terminal, setting an inhibition circuit, or directly using a logic circuit or latch chip with this function. In this case, the latching effect will not affect the subsequent circuit, so that the subsequent relay control is disconnected by default. During the period when the output is closed, the original control signal is reset based on the original control signal, so that the corresponding latch control signal can be used to control the relay to disconnect. After the reset is completed, the output terminal is enabled again, so as to output the second level latch control signal that disconnects the subsequent relay, thereby avoiding the above-mentioned malfunction and electric shock accidents.

[0044] Through the above circuit structure, the relay control circuit 100 can effectively transmit, latch or reset the original control signal, and can ensure that the relay is accurately energized or disconnected when needed, thereby achieving effective control of the circuit on and off. And because the latch control subcircuit 200 used by it can maintain its output state after receiving the original control signal, it does not need to be continuously powered, so it can also effectively reduce power consumption, and can significantly improve the operating efficiency and stability of the circuit when long-term operation or energy saving is required. And by introducing a reset function in the latch control subcircuit 200, it can avoid malfunctions and electric shock accidents when the system power is powered on again, and has good safety and reliability.

[0045] In addition, the relay control circuit 100 has a simple structure. Compared with the traditional circuit, it only needs to add a latch control sub-circuit 200 between the traditional original control signal and the high-side drive control circuit, and it only needs to simply connect the data input terminal D and the latch output terminal Q of the latch control sub-circuit 200. It is easy to implement and integrate, and the requirements for the processor upstream of the circuit and the relay coil downstream of the circuit are also relatively low. It is easy to be used in combination with the circuit structure, thereby realizing efficient integration and optimization of the circuit.

[0046] Optionally, see Figure 2 The latch control subcircuit 200 includes a latch chip 210 and a delay unit 220; the latch chip 210 includes an output enable terminal OE, a data input terminal D, a system power supply terminal VCC and a latch output terminal Q; the output enable terminal OE is connected to the output terminal of the delay unit 220, and the delay unit 220 is powered by the system power supply.

[0047] Among them, after the latch chip 210 confirms that the system power is powered on again based on the system power supply terminal VCC, the output enable terminal OE controls the latch output terminal Q to turn off the output for a preset time based on the delay unit 220 and then turn it on. Within the preset time, the latch chip 210 controls the latch control signal to reset, and after the preset time, outputs a second level latch control signal that controls the drive power supply to be disconnected from the relay coil.

[0048] In the process of realizing the corresponding transmission and latch control, the latch control subcircuit 200 can realize its functions based on the latch chip 210. The latch chip 210 includes an output enable terminal OE, a data input terminal D, a system power supply terminal VCC and a latch output terminal Q. When transmitting, the latch control subcircuit 200 transmits the original control signal after receiving the original control signal connected to the data input terminal D to output the corresponding latch control signal; and in the process of latch control, the latch control signal is locked to the corresponding level of the latch control signal generated based on the original control signal. The realization of these functions can be realized based on latch chips 210 with different control logic or different trigger types. For example, a latch chip 210 with edge triggering or level triggering can be used, which may include corresponding latches, logic gate circuits and control logic, etc., to realize the required functions.

[0049] In the process of implementing the corresponding reset control of the latch control subcircuit 200, a delay unit 220 is additionally added to the circuit structure of the latch control subcircuit 200. In the process of resetting, in order to maintain the latch output terminal Q to close the corresponding output, it is necessary to control the output enable terminal OE to maintain a corresponding level to control the output of the latch output terminal Q to close, and restore the corresponding output after the delay time that can be achieved by the delay unit 220. The output enable terminal OE is usually included in some latch chips 210. When the output enable terminal OE is opposite to the preset effective level, the corresponding latch output terminal Q will be in a high impedance state, so that no output can be generated. In addition, the control effect that can be achieved by the output enable terminal OE can also be achieved by other methods, such as by adding an additional switch or logic gate to the latch output terminal Q.

[0050] The delay unit 220 also has a variety of implementation methods. For example, it can be implemented using an RC delay circuit, a master-slave JK trigger delay circuit, a counter delay circuit, a digital logic delay circuit, and a transistor delay circuit, as long as the output enable terminal OE can maintain a certain level for a preset period of time when the system power is off to control the latch chip 210 to turn off the output, and the latch chip 210 can re-output the latch control signal of the second level after resetting.

[0051] Preferably, see Figure 3 The delay unit 220 includes a first resistor R1, a second resistor R2, a third resistor R3, a capacitor C and a MOS tube; a first end of the first resistor R1 is connected to a system power supply, a second end of the first resistor R1 is connected to a drain of the MOS tube, a source of the MOS tube is grounded GND, a gate of the MOS tube is connected to a first end of a third resistor R3, a second end of the third resistor R3 is connected to the system power supply, a first end of the second resistor R2 and a first end of the capacitor C are both coupled between the gate of the MOS tube and the first end of the third resistor R3, a second end of the second resistor R2 and a second end of the capacitor C are both grounded GND; an output enable terminal OE is coupled between the second end of the first resistor R1 and the drain of the MOS tube.

[0052] In this circuit, MOS tube (Metal Oxide Semiconductor Field-Effect Transistor, Metal Oxide Semiconductor Field-Effect Transistor, MOSFET) is used as a switch, usually N-type MOS tube. When the gate of the MOS tube receives a sufficiently high voltage, it will turn on to allow current to flow from the drain to the source. Conversely, when the gate voltage is low, the MOS tube will be cut off to prevent current from passing. The resistor and capacitor form an RC delay circuit. After the system power is turned on again, the capacitor is charged for a certain period of time to turn on the MOS tube, pull down the level, and set the input to the output enable terminal OE to a low level. It should be noted that under the condition of the delay unit 220, it is usually necessary to require the output enable terminal OE to be valid at a low level, or to add an inverter between the delay unit 220 and the output enable terminal OE, so that when the level of the output enable terminal OE is set to a high level or the inverter is set to a low level after power is turned on again, the output enable terminal OE is invalid, thereby turning off the output of the latch chip 210, and after a preset time, the output enable terminal OE can be effectively output to output the latch control signal. The preset time depends on the setting of the resistance value and the capacitance size in the delay circuit, and the present application does not make specific restrictions on this, as long as the reset based on the original control signal can be completed within the preset time.

[0053] Through the structure of the latch control subcircuit 200, the implementation scheme of the latch control subcircuit 200 is further refined, so that the latch control subcircuit 200 can realize the corresponding transmission, reset and latch based on the original control signal only through the internal latch chip 210 and the delay unit 220. It can effectively avoid the occurrence of electric vehicle uncontrolled and electric shock accidents caused by the relay still being locked in the pull-in state after the system is powered on again, and has good efficiency, stability and reliability. The circuit design is also relatively simple. The realization of the latch function is also conducive to reducing power consumption, facilitating the control and management of the connection or disconnection of the relay, and is conducive to improving the safety, comfort and reliability of electric vehicle driving. In addition, without resetting, the delay circuit will also control the output enable terminal OE to perform a certain delay processing to ensure the power-on logic of the latch chip 210, and avoid the relay malfunction caused by the latch chip 210 latching too fast during the normal transmission latching process.

[0054] Optionally, see Figure 4 The latch control subcircuit 200 also includes a latch enable terminal EL; when the latch chip 210 confirms the processor reset based on the original control signal, the latch enable terminal EL controls the latch chip 210 to latch to maintain the latch control signal the same as the latch control signal before the processor reset.

[0055] Processor reset is a problem that may affect safety and driving comfort in the relay control of electric vehicles. The processor of an electric vehicle often fails to work properly due to some fault factors, such as freezing, overheating or external interference. At this time, the processor needs to be reset to restore it to normal working state. At this time, it is equivalent to resetting the output of the processor, causing the original control signal output to be reset, causing the relay to be disconnected, and a sudden change in the relay state occurs. When the processor state is difficult to repair, the relay state will change frequently, which will have an adverse effect on the performance of the latch control subcircuit 200 and will also affect the safety and comfort of the relevant users driving the electric vehicle.

[0056] Therefore, under the structure of the latch control subcircuit 200, Figure 4 The setting of the latch enable terminal EL is further described, and the steps of the latch processing under the condition of processor reset are completed by setting the latch enable terminal EL. When the processor is reset, the latch chip 210 is controlled to perform a latch operation through the latch enable terminal EL to maintain the latch control signal the same as the latch control signal before the processor is reset. This can avoid the sudden change of the relay state when the processor is reset, thereby improving the safety and comfort of electric vehicle driving. At the same time, it also reduces the frequent changes of the relay state in the case where the processor state is difficult to repair, and improves the performance and stability of the latch control subcircuit 200.

[0057] Specifically, when the processor is reset, a reset signal is sent to the latch enable terminal EL. The reset signal can be a high level or low level signal, depending on the design of the latch chip 210. When the latch enable terminal EL receives the reset signal, it controls the latch chip 210 to perform a latch operation to maintain the latch control signal the same as the latch control signal before the processor is reset. In this way, even if the processor is reset, the state of the relay will not change, thereby avoiding the impact of the sudden change of the relay state on the driving of the electric vehicle. The reset signal can be sent by the processor, or it can be a signal that the latch chip 210 confirms and controls the latch enable terminal EL by itself, or it can be sent by other circuits or modules after detecting the processor reset. It should be noted that the setting of the latch enable terminal EL needs to be designed and implemented according to the specific latch chip 210 and the processor. The latch enable terminal can be controlled by an external instruction, or it can be judged and controlled by the latch chip itself. At the same time, when the processor is reset, other possible influencing factors need to be considered, such as the reset time and reset mode of the processor, to ensure the correctness and stability of the latch control subcircuit 200.

[0058] Through the above-mentioned setting of the latch enable terminal EL and the processing method of the circuit structure for the processor reset, the latch control subcircuit 200 realizes the function of keeping the relay state stable when the processor is reset, thereby improving the safety and comfort of electric vehicle driving. The latch control subcircuit 200 also has good scalability and customizability. For example, the preset duration of the delay unit 220 can be changed by adjusting the resistance value and the capacitance size to meet the needs of different application scenarios. At the same time, the stability and reliability of the circuit can be further improved by adding other circuit modules or functions, such as overcurrent protection, overvoltage protection, etc.

[0059] Optionally, when the latch enable terminal EL and the output enable terminal OE are both at valid levels, the latch control subcircuit 200 is used to transmit the original control signal, and the latch control signal is at the same level as the input original control signal; when the output enable terminal OE is at a valid level and the latch enable terminal EL is at an invalid level, the latch control subcircuit 200 is used to latch the original control signal, and the latch control signal maintains the first level or the second level of the original control signal transmitted last time; when the output enable terminal OE is at an invalid level, the latch control subcircuit 200 controls the latch output terminal Q to turn off the output.

[0060] The level states of the latch enable terminal EL and the output enable terminal OE determine the working mode of the latch control subcircuit 200. The effective level of the latch enable terminal EL can be the first level or the second level, and the effective level of the output enable terminal OE can also be the first level or the second level. The effective levels of the two can be the same or different, and the specific needs need to be confirmed for the circuit structure and parameter requirements of different latch chips 210. When the latch enable terminal EL and the output enable terminal OE are both valid, the corresponding latch chip 210 can latch and output the signal, that is, transmit the original control signal. When the latch enable terminal EL becomes an invalid level, the latch chip 210 does not latch new data, so it will latch the same signal unchanged, realize the latching and output of fixed data, that is, maintain the first level or the second level of the previous transmission. When the output enable terminal OE is an invalid level, the output of the latch output terminal Q is correspondingly turned off. In the device with the output turned off, the latch can complete the corresponding reset function, that is, enable and reset the original control signal to the corresponding control relay disconnected signal through the latch enable terminal EL to achieve reset.

[0061] Optionally, the model of the latch chip 210 is SN74LVC1G373DBVR.

[0062] SN74LVC1G373DBVR is a high-speed CMOS device with a three-state output function. It uses a wide operating power supply voltage range of 1.65V to 5.5V, and has the characteristics of low power consumption and fast operation. When this chip is selected as the latch chip 210, the effective level of the latch enable terminal EL mentioned above needs to be high, and the effective level of the output enable terminal OE needs to be low. Since the output enable terminal OE is low-level effective, its port is usually marked as OE# or Based on this chip and according to the level relationship as described above, the original control signal can be effectively transmitted to input a new signal, or the original control signal can be latched to control the output signal to be locked as the previously transmitted signal. The original control signal can also be effectively reset to output a latch control signal that controls the latch to disconnect.

[0063] By selecting the above-mentioned levels and the latch chip 210, the latch control subcircuit 200 can effectively realize the corresponding transmission, resetting and latching functions, can effectively avoid malfunction of the relay, is beneficial to the efficiency and stability of the relay control, and thus improves the safety and comfort of electric vehicle driving.

[0064] Optionally, see Figure 5 The high-side drive sub-circuit 300 includes a high-side drive switch 310 and a diode D1; the high-side drive switch 310 includes a drive input terminal VBB, a drive control terminal IN and a drive output terminal OUT, the drive output terminal OUT is connected to the cathode of the diode D1, and the anode of the diode D1 is grounded.

[0065] The high-side drive switch 310 is a switch device for controlling the connection and disconnection between the power supply and the load, which is equivalent to a controllable switch added to the power supply end of the circuit. By controlling the closing and disconnection of this switch, the drive device is enabled. The drive control terminal IN of the high-side drive switch 310 receives a latch control signal, and controls the on-off relationship between the drive power supply input by the drive input terminal VBB and the relay coil according to the latch control signal, controls the level state of the drive output terminal OUT, thereby controlling the current on and off of the relay coil, and realizing the switch control of the relay. The diode D1 is set to absorb the high voltage spike generated when the load end connected to the drive output terminal OUT is disconnected, so as to avoid the damage of the spike to the control circuit. The cathode of the diode D1 is connected to the drive output terminal OUT, and the anode is grounded. When the current of the relay coil is cut off, the generated back electromotive force forms a loop through the diode D1, and the energy is discharged to the ground, thereby protecting the control circuit.

[0066] Optionally, the model of the high-side driver switch 310 is BTS724G.

[0067] BTS724G is an intelligent high-side power switch, which has the characteristics of low on-resistance, high switching speed, over-temperature protection and short-circuit protection. When BTS724G is used as the high-side drive switch 310, its drive control terminal IN receives the above-mentioned latch control signal, and controls the on-off relationship between the drive input terminal VBB and the relay coil according to the high and low level states of the latch control signal, thereby controlling the switch state of the relay. In the relay control circuit 100, when the received latch control signal is the corresponding signal of the original control signal indicating the control relay to be attracted, the drive output terminal OUT of BTS724G is connected to the drive input terminal VBB, and the drive power supply provides current to the relay coil through the drive output terminal OUT, so that the relay is attracted, and the circuit is connected. When the received latch control signal is the corresponding signal of the original control signal indicating the control relay to be attracted, the drive output terminal OUT of BTS724G is disconnected from the drive input terminal VBB, the current of the relay coil is cut off, and the relay is disconnected, realizing the disconnection of the circuit.

[0068] Through the structural setting of the high-side drive subcircuit 300, the latch control subcircuit 200 can be better applied to the relay control circuit 100 to achieve corresponding drive control, and control the on-off relationship between the drive power input at the drive input terminal VBB and the relay coil according to the latch control signal, and control the level state of the drive output terminal OUT, thereby controlling the current on-off of the relay coil, and improving the stability and reliability of the circuit. The combination of the high-side drive switch 310 and the diode D1 realizes the precise control of the relay coil current, effectively avoiding the influence of the current being too large or too small on the working performance of the relay, and the addition of the diode D1 can also effectively absorb the high voltage spike generated when the load terminal is disconnected, protecting the control circuit from damage, and improving the safety of the circuit.

[0069] See also Figure 6 , Figure 6 It is a structural schematic diagram of an embodiment of a relay control system provided by the present application.

[0070] The relay control system 400 includes a processor 410, a relay coil 420 and a Figures 1 to 5 The control signal output terminal of the processor 410 is connected to the data input terminal D of the latch control subcircuit 200 in the relay control circuit 100. The driving output terminal OUT of the high-side driving subcircuit 300 of the relay control circuit 100 is connected to the relay control port RLY of the relay coil 420.

[0071] In the relay control system 400, a processor 410 and a relay coil 420 are specially added, which is equivalent to adding the source of the original control signal of the aforementioned relay control circuit 100, and finally outputting the controlled relay device. Among them, the processor 410 generates corresponding control signals according to the vehicle operation state and the user operation instruction, and controls the relay coil 420 through the relay control circuit 100 to realize the switch and switching of the circuit. The relay control circuit 100, as a bridge between the processor 410 and the relay coil 420, is responsible for transmitting the control signal of the processor 410 to the relay coil 420, and controls the current on and off of the relay coil 420 according to the state of the control signal, thereby controlling the switch and switching of the circuit. The relay control system 400 can be applied to electric vehicles with different control tasks, different types of relays and different electrical parameter requirements, and this application does not make specific restrictions on this.

[0072] See also Figure 7 , Figure 7 It is a structural schematic diagram of an embodiment of a power chip provided in the present application.

[0073] The power chip 500 includes: Figures 1 to 5 The relay control circuit 100 described. The power chip 500 is integrated with the relay control circuit 100, so as to achieve the corresponding control effect on the relay. The chip can be a power chip 500 made based on different preparation technologies, different processes, different sizes and different manufacturers, and this application does not make specific limitations on this.

[0074] See also Figure 8 , Figure 8 It is a structural schematic diagram of an embodiment of the vehicle-mounted device provided by the present application.

[0075] The vehicle-mounted device 600 includes: Figure 6 The power chip 500 described. The vehicle-mounted device 600 can be any device in an electric vehicle that requires a relay, such as a motor controller, a battery management system, a charging system, etc., and this application does not impose specific restrictions on this. Through the power chip 500 integrated with the relay control circuit 100, these vehicle-mounted devices 600 can achieve precise control of the relay, thereby achieving efficient, stable and safe control of the circuit.

[0076] See also Fig. 9 , Fig. 9 It is a structural schematic diagram of an embodiment of an electric vehicle provided by the present application.

[0077] The electric vehicle 700 includes: Figure 6 The power chip 500 described or Figure 7The vehicle-mounted device 600 described in the figure takes an electric vehicle 700 including the vehicle-mounted device 600 as an example. The electric vehicle 700 can be any type of electric vehicle 700, such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, etc., and the present application does not impose specific restrictions on this. By integrating the power chip 500 or the vehicle-mounted device 600 with the relay control circuit 100, the electric vehicle 700 can achieve efficient, stable and safe control of the circuit, thereby improving the performance and reliability of the electric vehicle 700. In addition, the integration of the relay control circuit 100 can also simplify the circuit design of the electric vehicle 700, reduce the risk of circuit failure, and reduce the maintenance cost and difficulty of maintenance.

[0078] In the electric car 700, the power chip 500 or the vehicle-mounted device 600 can generate corresponding control signals according to the vehicle operation state, the driver's operating instructions, and the signals of other sensors and control systems, and control the relay coil 420 through the relay control circuit 100 to realize the switching and switching of the circuit. For example, in the motor control system of the electric car 700, the power chip 500 or the vehicle-mounted device 600 can realize the on-off control of the motor drive circuit by controlling the switching state of the relay, thereby controlling the speed and direction of the motor. In the battery management system, the power chip 500 or the vehicle-mounted device 600 can realize the charging and discharging control of the battery pack by controlling the switching state of the relay, protect the battery pack from damage caused by excessive charging and discharging, and improve the service life and safety of the battery pack.

[0079] Different from the prior art, the present application discloses a relay control circuit, system, chip, device and electric vehicle. By adding a latch control subcircuit before the high-side drive subcircuit in the relay control circuit, the original control signal for indicating the connection or disconnection of the control relay is transmitted, latched or reset, so that the original control signal is transmitted to control the high-side drive subcircuit when the system is operating normally, and the original control signal is reset when the system is powered on again, so as to output a latch control signal for controlling the disconnection of the high-side drive subcircuit, so that the relay is disconnected, and the electric vehicle is prevented from being out of control and electric shock accidents caused by the relay still being locked in the attracted state after power is turned on again. In addition, when the processor is reset, the latch control subcircuit can also make the latch control signal it outputs the same as the latch control signal before the processor is reset, so as to avoid faults caused by frequent switching of the relay state caused by software reset and adverse effects on driving comfort and smoothness. The use of this circuit in relay control has good efficiency, stability and reliability, and is relatively simple in circuit design. The realization of the latch function is conducive to reducing system power consumption, facilitating the control and management of the connection or disconnection of the relay, and is conducive to improving the safety, comfort and reliability of electric vehicle driving.

[0080] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the relay control system embodiment, the power chip embodiment, the vehicle-mounted equipment embodiment and the electric vehicle embodiment, since they are basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0081] The present application can be used in many general or special computing system environments or configurations, such as personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc.

[0082] In the several embodiments provided in this application, it should be understood that the disclosed circuits, systems, power chips, vehicle-mounted devices, and electric vehicles can be implemented in other ways. For example, the device implementation described above is only illustrative, for example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0083] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0084] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0085] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A relay control circuit, characterized in that: include: A latch control subcircuit, wherein a data input terminal of the latch control subcircuit is connected to an original control signal, a system power supply terminal of the latch control subcircuit is connected to a system power supply, and a latch output terminal of the latch control subcircuit outputs a latch control signal, and is used to transfer, latch or reset based on the original control signal to obtain the latch control signal; A high-side drive subcircuit, wherein the drive control end of the high-side drive subcircuit is connected to the latch output end of the latch control subcircuit, the drive input end of the high-side drive subcircuit is connected to the drive power supply, and the drive output end of the high-side drive subcircuit is connected to the relay coil, and is used to control the on and off of the drive power supply and the relay coil based on a latch control signal to control the relay to be connected or disconnected; Among them, the original control signal is sent by the processor, instructing the control relay to be connected or disconnected; when the latch control signal is at a first level, the relay is controlled to be connected, and when the latch control signal is at a second level, the control relay is disconnected; after the latch control subcircuit confirms that the system power is powered on again through the system power supply end, the latch output end is controlled to turn off the output, and the output of the latch output end is turned on after the original control signal is reset, so as to output the latch control signal of the second level.

2. The relay control circuit according to claim 1, characterized in that: The latch control subcircuit comprises a latch chip and a delay unit; the latch chip comprises an output enable terminal, the data input terminal, the system power supply terminal and the latch output terminal; the output enable terminal is connected to the output terminal of the delay unit, and the delay unit is powered by the system power supply; Among them, after the latch chip confirms that the system power is powered on again based on the system power supply end, the output enabling end controls the latch output end to turn off the output for a preset time based on the delay unit and then turn it on. Within the preset time, the latch chip controls the latch control signal to reset, and after the preset time, outputs the latch control signal of the second level that controls the drive power supply to be disconnected from the relay coil.

3. The relay control circuit according to claim 2, characterized in that: The delay unit includes a first resistor, a second resistor, a third resistor, a capacitor and a MOS tube; The first end of the first resistor is connected to the system power supply, the second end of the first resistor is connected to the drain of the MOS tube, the source of the MOS tube is grounded, the gate of the MOS tube is connected to the first end of the third resistor, the second end of the third resistor is connected to the system power supply, the first end of the second resistor and the first end of the capacitor are both coupled between the gate of the MOS tube and the first end of the third resistor, and the second end of the second resistor and the second end of the capacitor are both grounded; the output enable terminal is coupled between the second end of the first resistor and the drain of the MOS tube.

4. The relay control circuit according to claim 2, characterized in that: The latch control subcircuit also includes a latch enable terminal; When the latch chip confirms the processor reset based on the original control signal, the latch enable terminal controls the latch chip to latch to maintain the latch control signal the same as the latch control signal before the processor reset.

5. The relay control circuit according to claim 4, characterized in that: When the latch enable terminal and the output enable terminal are both at valid levels, the latch control subcircuit is used to transmit the original control signal, and the latch control signal is at the same level as the input original control signal; When the output enable terminal is at a valid level and the latch enable terminal is at an invalid level, the latch control subcircuit is used to latch the original control signal, and the latch control signal maintains the first level or the second level of the original control signal transmitted last time; When the output enable terminal is at an invalid level, the latch control subcircuit controls the latch output terminal to turn off output.

6. The relay control circuit according to claim 1, characterized in that: The high-side drive subcircuit includes a high-side drive switch and a diode; The high-side drive switch comprises the drive input terminal, the drive control terminal and the drive output terminal. The drive output terminal is connected to the cathode of the diode, and the anode of the diode is grounded.

7. A relay control system, characterized in that: The relay control system comprises a processor, a relay coil and a relay control circuit as claimed in any one of claims 1 to 6; The control signal output terminal of the processor is connected to the data input terminal of the latch control subcircuit in the relay control circuit; The driving output end of the high-side driving subcircuit of the relay control circuit is connected to the relay control port of the relay coil.

8. A power chip, characterized in that: The invention comprises the relay control circuit as claimed in any one of claims 1 to 6.

9. A vehicle-mounted device, characterized in that: The vehicle-mounted device comprises the power chip as claimed in claim 8.

10. An electric vehicle, characterized in that: The electric vehicle comprises the power chip as claimed in claim 8 or the on-vehicle device as claimed in claim 9.

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