A low power consumption management system and method for an instrument

Abstract

The present invention discloses an instrument low-power management system and method, which relates to the field of instrument control technology, including: a power management circuit, a CAN transceiver circuit, a CAN management circuit and a wake-up judgment circuit; the power management circuit is connected to an MCU and a vehicle end; the CAN transceiver circuit is connected to the MCU and the vehicle end; the CAN management circuit is connected to the MCU and the CAN transceiver circuit; the wake-up judgment circuit is connected to the MCU, the vehicle end and the CAN management circuit; after the system is powered on, when the wake-up judgment circuit receives a second level signal from the vehicle end and receives a first level signal from the CAN management circuit, the wake-up judgment circuit enables the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit. The present invention can achieve low power consumption of the instrument with a dark current of less than 1mA when the MCU is dormant.

Description

Technical Field

[0001] The present invention relates to the technical field of instrument control, and in particular to an instrument low power consumption management system and method. Background Art

[0002] At present, most automotive electronic products require that after the car key / one-button start is turned off and the power is dormant, they must first meet the requirements of lower dark current and lower power consumption to reduce battery power consumption; second, according to the expected functional definition, during the period, they must be able to monitor and respond to certain vehicle conditions and signal changes, and wake up the product to achieve the predetermined functions, such as display, alarm, sending / forwarding messages, and outputting corresponding status.

[0003] In the prior art, a common solution is to use an MCU with a sleep mode, during which the low power consumption parameters of the device itself are used to ensure low power consumption of the instrument.

[0004] However, when the existing MCU is in sleep mode, it relies on the device's own parameters to perform low-power management of the instrument. The dark current of the instrument can only reach 2-3mA or above. The dark current is still large, and the power consumption is still large. Summary of the invention

[0005] The embodiment of the present invention provides an instrument low power management system and method to solve the technical problem that the existing technology in the related art relies on the parameters of the MCU itself during sleep to perform instrument low power management, and the dark current of the instrument is still large, resulting in still large power consumption of the instrument.

[0006] In a first aspect, an instrument low power consumption management system is provided, comprising: a power management circuit, a CAN transceiver circuit, a CAN management circuit and a wake-up judgment circuit;

[0007] The power management circuit is connected to the MCU and the vehicle end;

[0008] The CAN transceiver circuit is connected to the MCU and the vehicle end;

[0009] The CAN management circuit is connected to the MCU and the CAN transceiver circuit;

[0010] The wake-up judgment circuit is connected to the MCU, the vehicle end and the CAN management circuit;

[0011] After the system is powered on, when the wake-up judgment circuit receives the first level signal from the vehicle end or receives the second level signal from the CAN management circuit, the wake-up judgment circuit is used to enable the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enable the MCU to control the CAN management circuit to conduct the message channel between the MCU and the CAN transceiver circuit;

[0012] When the wake-up judgment circuit receives the second level signal from the vehicle end and the first level signal from the CAN management circuit, the wake-up judgment circuit is used to enable the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and to enable the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit.

[0013] In some embodiments, the CAN transceiver circuit includes a first resistor, a second resistor, a third resistor and a CAN transceiver chip;

[0014] The CAN management circuit includes a CAN management chip;

[0015] A first end of the first resistor is connected to the MCU, and a second end of the first resistor is connected to the CAN transceiver chip;

[0016] A first end of the second resistor is connected to the MCU, and a second end of the second resistor is connected to the CAN management chip;

[0017] The CAN management chip is connected to the MCU and the CAN transceiver chip;

[0018] The first end of the third resistor is connected to the power supply, and the second end of the third resistor is connected to the CAN transceiver chip.

[0019] In some embodiments, the CAN management circuit further includes a fourth resistor, a fifth resistor and a first transistor;

[0020] A first end of the fourth resistor is connected to the MCU, and a second end of the fourth resistor is connected to the base of the first transistor;

[0021] A first end of the fifth resistor is connected to the base of the first transistor, and a second end of the fifth resistor is connected to the emitter of the first transistor and is grounded;

[0022] The collector of the first transistor is connected to the second end of the third resistor.

[0023] In some embodiments, the wake-up determination circuit includes a sixth resistor, a seventh resistor, a twelfth resistor, and a second transistor;

[0024] The first end of the sixth resistor is connected to the vehicle end, and the second end of the sixth resistor is connected to the base of the second transistor;

[0025] A first end of the seventh resistor is connected to the base of the second transistor, and a second end of the seventh resistor is connected to the emitter of the second transistor and is grounded;

[0026] A first end of the twelfth resistor is connected to the MCU, and a second end of the twelfth resistor is connected to the emitter of the second transistor.

[0027] In some embodiments, the wake-up determination circuit further includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a third transistor;

[0028] A first end of the eighth resistor is connected to a power source, and a second end of the eighth resistor is connected to a first end of the seventh resistor;

[0029] A first end of the ninth resistor is connected to a power supply, and a second end of the ninth resistor is connected to the CAN management chip;

[0030] The first end of the tenth resistor is connected to the second end of the ninth resistor, and the second end of the tenth resistor is connected to the base of the third transistor;

[0031] A first end of the eleventh resistor is connected to the base of the third transistor, and a second end of the eleventh resistor is connected to the emitter of the third transistor and is grounded.

[0032] In some embodiments, the wake-up determination circuit further includes a first diode, a second diode, a third diode, and a fourth diode;

[0033] The anode of the first diode is connected to the vehicle end, and the cathode of the first diode is connected to the first end of the sixth resistor;

[0034] An anode of the second diode is connected to the first end of the eighth resistor, and a cathode of the second diode is connected to the base of the second transistor;

[0035] An anode of the third diode is connected to the second end of the ninth resistor, and a cathode of the third diode is connected to the first end of the tenth resistor;

[0036] An anode of the fourth diode is connected to the second end of the ninth resistor, and a cathode of the fourth diode is connected to the CAN management chip.

[0037] In some embodiments, the instrument low power consumption management system further includes:

[0038] A level signal judgment circuit is connected to the MCU and the vehicle end.

[0039] In some embodiments, the level signal determination circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a fourth transistor;

[0040] A first end of the thirteenth resistor is connected to the vehicle end, and a second end of the thirteenth resistor is connected to the base of the fourth transistor;

[0041] A first end of the fourteenth resistor is connected to the base of the fourth transistor, and a second end of the fourteenth resistor is connected to the emitter of the fourth transistor and is grounded;

[0042] A first end of the fifteenth resistor is connected to a power supply, and a second end of the fifteenth resistor is connected to a collector of the fourth transistor;

[0043] A first end of the sixteenth resistor is connected to the collector of the fourth transistor, and a second end of the sixteenth resistor is connected to the MCU.

[0044] In some embodiments, the power management circuit includes a system power management module and an MCU function power management module;

[0045] The system power management module is connected to the MCU and the vehicle end;

[0046] The MCU functional power management module is connected to the MCU and the system power management module.

[0047] In a second aspect, a low power consumption management method for an instrument is provided, comprising the following steps:

[0048] Power on the system;

[0049] When the wake-up judgment circuit receives the first level signal from the vehicle end or the second level signal from the CAN management circuit, the wake-up judgment circuit enables the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to turn on the message channel between the MCU and the CAN transceiver circuit;

[0050] When the wake-up judgment circuit receives the second level signal from the vehicle end and the first level signal from the CAN management circuit, the wake-up judgment circuit causes the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and causes the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit.

[0051] The beneficial effects brought about by the technical solution provided by the present invention include:

[0052] The embodiment of the present invention provides an instrument low power management system and method, wherein the management system is provided with a CAN management circuit and a wake-up judgment circuit. When the wake-up judgment circuit receives the second level signal of the vehicle end and receives the first level signal of the CAN management circuit, the wake-up judgment circuit enables the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit. That is, when there is no message transmission between the MCU and the CAN transceiver circuit and the vehicle end has no other working requirements for the MCU, the present invention automatically disconnects the functional power domain of the MCU, and at the same time disconnects the message channel between the MCU and the CAN transceiver circuit, so that the dark current in the instrument is less than 1mA, reducing the power consumption of the instrument when the MCU is dormant. The present invention can not only achieve low power consumption of less than 1mA of the dark current of the instrument during MCU dormancy, but also has the function of monitoring the signal changes of the vehicle end and the transceiver state changes of the CAN transceiver circuit during dormancy, timely responding to wake up the functional power domain of the MCU and conducting the message channel between the MCU and the CAN transceiver circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0054] Figure 1 A schematic diagram of the structure of an instrument low power consumption management system provided by an embodiment of the present invention;

[0055] Figure 2 A workflow diagram of an instrument low power consumption management system provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] The embodiment of the present invention provides an instrument low power management system, which can solve the technical problem that the prior art relies on the parameters of the MCU itself during sleep to perform instrument low power management, and the dark current of the instrument is still large, resulting in still large power consumption of the instrument.

[0058] join Figure 1 As shown, an embodiment of the present invention provides an instrument low power consumption management system, including: a power management circuit, a CAN transceiver circuit, a CAN management circuit and a wake-up judgment circuit.

[0059] The power management circuit is connected to the MCU and the vehicle end, the CAN transceiver circuit is connected to the MCU and the vehicle end, the CAN management circuit is connected to the MCU and the CAN transceiver circuit, and the wake-up judgment circuit is connected to the MCU, the vehicle end and the CAN management circuit.

[0060] After the system is powered on, when the wake-up judgment circuit receives the first level signal from the vehicle end or receives the second level signal from the CAN management circuit, the wake-up judgment circuit is used to enable the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enable the MCU to control the CAN management circuit to turn on the message channel between the MCU and the CAN transceiver circuit.

[0061] When the wake-up judgment circuit receives the second level signal from the vehicle end and the first level signal from the CAN management circuit, the wake-up judgment circuit is used to enable the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and to enable the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit.

[0062] Specifically, see Figure 1 As shown, the first level signal and the second level signal of the vehicle end represent the high level signal and the low level signal of IGNon+ or KEY+ of the vehicle end. The first level signal and the second level signal of the CAN management circuit are the high level signal and the low level signal reflecting the message receiving and sending status CAN_Rx_WakeUP of the CAN transceiver circuit. Among them, the high level signal of CAN_Rx_WakeUP indicates that there is no any message on the CAN bus, and the high level signal of CAN_Rx_WakeUP indicates that there is any message on the CAN bus.

[0063] When IGNon+ or KEY+ on the vehicle side is at a high level or CAN_Rx_WakeUP of the CAN management circuit is at a low level, the wake-up judgment circuit enables the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to turn on the message channel between the MCU and the CAN transceiver circuit, which is a normal working state.

[0064] When IGNon+ or KEY+ on the vehicle side is at a low level and CAN_Rx_WakeUP of the CAN management circuit is at a high level, the wake-up judgment circuit enables the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit, entering a sleep state.

[0065] The low-power management system for the instrument in the embodiment of the present invention is provided with a CAN management circuit and a wake-up judgment circuit. When the wake-up judgment circuit receives the second level signal of the vehicle end and the first level signal of the CAN management circuit, the wake-up judgment circuit enables the MCU to control the power management circuit to disconnect the functional power domain of the MCU and enables the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit. That is, when there is no message transmission between the MCU and the CAN transceiver circuit and the vehicle end has no other working requirements for the MCU, the present invention automatically disconnects the functional power domain of the MCU and disconnects the message channel between the MCU and the CAN transceiver circuit, so that the dark current in the instrument is less than 1mA, reducing the power consumption of the instrument when the MCU is dormant. The present invention can not only achieve low power consumption of less than 1mA of the dark current of the instrument during the MCU dormancy period, but also has the function of monitoring the signal changes of the vehicle end and the transceiver state changes of the CAN transceiver circuit during the dormancy period, and promptly responds to wake-up and turns on the functional power domain of the MCU and turns on the message channel between the MCU and the CAN transceiver circuit.

[0066] As an optional implementation, in an embodiment of the invention, the CAN transceiver circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a CAN transceiver chip. The CAN management circuit includes a CAN management chip.

[0067] The first end of the first resistor R1 is connected to the MCU, and the second end of the first resistor R1 is connected to the CAN transceiver chip. The first end of the second resistor R2 is connected to the MCU, and the second end of the second resistor R2 is connected to the CAN management chip.

[0068] The CAN management chip is connected to the MCU and the CAN transceiver chip, the first end of the third resistor R3 is connected to a power supply, wherein the power supply is the core normal power Vcc_3V3_SNVS of the system, and the second end of the third resistor R3 is connected to the CAN transceiver chip.

[0069] Specifically, Figure 1As shown, the CAN management chip is set between the MCU and the Rx message channel of the CAN transceiver chip. When IGNon+ or KEY+ of the vehicle end is high or CAN_Rx_WakeUP of the CAN management circuit is low, the wake-up judgment circuit enables the MCU to control the CAN management chip to turn on the Rx message channel between the MCU and the CAN transceiver circuit. When IGNon+ or KEY+ of the vehicle end is low and CAN_Rx_WakeUP of the CAN management circuit is high, the wake-up judgment circuit enables the MCU to control the CAN management chip to disconnect the Rx message channel between the MCU and the CAN transceiver circuit, thereby reducing dark current and power consumption. Figure 1 In the embodiment, the MCU controls the CAN management chip to turn on the Rx message channel between the MCU and the CAN transceiver circuit by setting CANn_STBctrl to 1, and the MCU controls the CAN management chip to disconnect the Rx message channel between the MCU and the CAN transceiver circuit by setting CANn_STBctrl to 0.

[0070] As an optional implementation, in an embodiment of the invention, the CAN management circuit further includes a fourth resistor R4, a fifth resistor R5 and a first transistor Q1.

[0071] The first end of the fourth resistor R4 is connected to the MCU, and the second end of the fourth resistor R4 is connected to the base of the first transistor Q1. The first end of the fifth resistor R5 is connected to the base of the first transistor Q1, the second end of the fifth resistor R5 is connected to the emitter of the first transistor Q1 and grounded, and the collector of the first transistor Q1 is connected to the second end of the third resistor R3.

[0072] Specifically, Figure 1 and Figure 2As shown, when IGNon+ or KEY+ of the vehicle end is low and CAN_Rx_WakeUP of the CAN management circuit is high, the wake-up judgment circuit controls the MCU to set CANn_STBctrl to 0, controls the first transistor Q1 to be disconnected, and puts the CAN transceiver chip in a standby low-power state. At the same time, the CAN management chip is controlled to disconnect the connection between the CANn_Rx communication channel of the MCU and the CANn_Rx0 communication channel of the CAN transceiver chip to control the MCU to reduce power consumption; the CAN management chip is controlled to conduct the connection between the CANn_Rx0 channel of the CAN transceiver chip and the judgment channel CANn_RX_Wakeup of the wake-up judgment circuit, so as to be able to judge whether there is an input CAN message at the vehicle end at any time. At the same time, the MCU controls the power management circuit to turn off all functional power domains of the MCU except the core SNVS, thereby putting the entire instrument system in a dormant low-power state to meet the requirement of dark current <1mA (the product is measured to be about 0.5mA).

[0073] As an optional implementation, in an embodiment of the invention, the wake-up determination circuit includes a sixth resistor R6, a seventh resistor R7, a twelfth resistor R12 and a second transistor Q2.

[0074] The first end of the sixth resistor R6 is connected to the vehicle end, the second end of the sixth resistor R6 is connected to the base of the second transistor, the first end of the seventh resistor R7 is connected to the base of the second transistor Q2, the second end of the seventh resistor R7 is connected to the emitter of the second transistor Q2 and grounded. The first end of the twelfth resistor 12 is connected to the MCU, and the second end of the twelfth resistor 12 is connected to the emitter of the second transistor Q2.

[0075] See also Figure 1 and Figure 2As shown, when IGNon+ or KEY+ at the vehicle end is at a high level, the second transistor Q2 is turned on, the signal WakeUP=0, the MCU is awakened, the MCU turns on all functional power domains of the MCU except the core SNVS, the wake-up judgment circuit controls the MCU to set CANn_STBctrl to 1, and the MCU controls the power management circuit to turn on all functional power domains of the MCU except the core SNVS. At the same time, the CAN management chip is controlled to turn on the connection between the CANn_Rx communication channel of the MCU and the CANn_Rx0 communication channel of the CAN transceiver chip, so that the MCU and the CAN transceiver chip can communicate normally; the CAN management chip is controlled to disconnect the connection between the CANn_Rx0 channel of the CAN transceiver chip and the judgment channel CANn_RX_Wakeup of the wake-up judgment circuit to avoid interference in the communication between the MCU and the CAN transceiver chip.

[0076] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the wake-up judgment circuit further includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a third transistor Q3.

[0077] The first end of the eighth resistor R8 is connected to the power supply, the second end of the eighth resistor R8 is connected to the first end of the seventh resistor R7, the first end of the ninth resistor R9 is connected to the power supply, the second end of the ninth resistor R9 is connected to the CAN management chip, the first end of the tenth resistor R10 is connected to the second end of the ninth resistor R9, the second end of the tenth resistor R10 is connected to the base of the third transistor Q3, the first end of the eleventh resistor R11 is connected to the base of the third transistor Q3, and the second end of the eleventh resistor R11 is connected to the emitter of the third transistor Q3 and grounded.

[0078] See also Figure 1 and Figure 2As shown, when CAN_Rx_WakeUP is at a low level, the third transistor Q3 is not turned on, so that the second transistor Q2 is turned on, and the signal WakeUP=0 wakes up the MCU, and the MCU turns on all functional power domains of the MCU except the core SNVS. The wake-up judgment circuit enables the MCU to control CANn_STBctrl to be set to 1, and the MCU controls the power management circuit to turn on all functional power domains of the MCU except the core SNVS. At the same time, the CAN management chip is controlled to turn on the connection between the CANn_Rx communication channel of the MCU and the CANn_Rx0 communication channel of the CAN transceiver chip, so that the MCU and the CAN transceiver chip can communicate normally; the CAN management chip is controlled to disconnect the connection between the CANn_Rx0 channel of the CAN transceiver chip and the judgment channel CANn_RX_Wakeup of the wake-up judgment circuit to avoid interference in the communication between the MCU and the CAN transceiver chip.

[0079] Also, see Figure 1 and Figure 2 As shown, when IGNon+ or KEY+ at the vehicle end is at a low level and CAN_Rx_WakeUP is at a high level, the third transistor Q3 is turned on, the second transistor Q2 is not turned on, the signal WakeUP=1, and the sleep process is executed, so that the entire instrument system is in a sleep low power state.

[0080] As an optional implementation, in an embodiment of the invention, see Figure 1 As shown, the wake-up judgment circuit further includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.

[0081] The anode of the first diode D1 is connected to the vehicle end, the cathode of the first diode D1 is connected to the first end of the sixth resistor R6, the anode of the second diode D2 is connected to the first end of the eighth resistor R8, the cathode of the second diode D2 is connected to the base of the second transistor D2, the anode of the third diode D3 is connected to the second end of the ninth resistor R9, the cathode of the third diode D3 is connected to the first end of the tenth resistor R10, the anode of the fourth diode D4 is connected to the second end of the ninth resistor R9, and the cathode of the fourth diode D4 is connected to the CAN management chip. The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 can prevent current reverse.

[0082] It should be noted that Figure 1CANn represents any nth channel, and CANn+1 represents any other channel. That is, the CAN transceiver circuit and the CAN management circuit can be expanded according to needs, and the wake-up judgment circuit can realize multi-channel control.

[0083] As an optional implementation, in an embodiment of the invention, the instrument low power management system also includes: a level signal judgment circuit, which is connected to the MCU and the vehicle end. The MCU can judge whether the vehicle IGN or KEY is powered on or off through the level signal judgment circuit. When the signal WakeUP=0, the level signal judgment circuit provides a basis for the MCU to prove whether the IGNon+ or KEY+ on the vehicle end is high or CAN_Rx_WakeUP is low, making WakeUP=0.

[0084] Further, the level signal judgment circuit includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16 and a fourth transistor Q4, the first end of the thirteenth resistor R13 is connected to the vehicle end, the second end of the thirteenth resistor R13 is connected to the base of the fourth transistor Q4, the first end of the fourteenth resistor R14 is connected to the base of the fourth transistor Q4, the second end of the fourteenth resistor R14 is connected to the emitter of the fourth transistor Q4 and grounded, the first end of the fifteenth resistor R15 is connected to the power supply, the second end of the fifteenth resistor R15 is connected to the collector of the fourth transistor Q4, the first end of the sixteenth resistor R16 is connected to the collector of the fourth transistor Q4, and the second end of the sixteenth resistor R16 is connected to the MCU.

[0085] As an optional implementation, in one embodiment of the invention, the power management circuit includes a system power management module and an MCU function power management module.

[0086] The system power management module is connected to the MCU and the vehicle end, and the MCU functional power management module is connected to the MCU and the system power management module.

[0087] The system power management module is used to convert the power of the vehicle end into the power required by the system. Vcc_3V3_SNVS is the normal power of the MCU core, and Vcc_3V3_MCU provided to the MCU functional power management module is the functional power domain other than the normal power of the MCU core. The MCU functional power management module is connected to the MCU and the system power management module. When IGNon+ or KEY+ of the vehicle end is low and CAN_Rx_WakeUP of the CAN management circuit is high, the wake-up judgment circuit enables the MCU to control the MCU functional power management module to disconnect the functional power domain of the MCU.

[0088] An embodiment of the present invention provides a low power consumption management method for an instrument, comprising the following steps:

[0089] Power on the system;

[0090] When the wake-up judgment circuit receives the first level signal from the vehicle end or the second level signal from the CAN management circuit, the wake-up judgment circuit enables the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to turn on the message channel between the MCU and the CAN transceiver circuit;

[0091] When the wake-up judgment circuit receives the second level signal from the vehicle end and the first level signal from the CAN management circuit, the wake-up judgment circuit causes the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and causes the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit.

[0092] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0093] It should be noted that, in the present invention, 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 such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0094] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. An instrument low power consumption management system, characterized in that: include: Power management circuit, CAN transceiver circuit, CAN management circuit and wake-up judgment circuit; The power management circuit is connected to the MCU and the vehicle end; The CAN transceiver circuit is connected to the MCU and the vehicle end; The CAN management circuit is connected to the MCU and the CAN transceiver circuit; The wake-up judgment circuit is connected to the MCU, the vehicle end and the CAN management circuit; After the system is powered on, when the wake-up judgment circuit receives the first level signal from the vehicle end or receives the second level signal from the CAN management circuit, the wake-up judgment circuit is used to enable the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enable the MCU to control the CAN management circuit to conduct the message channel between the MCU and the CAN transceiver circuit; When the wake-up judgment circuit receives the second level signal from the vehicle end and the first level signal from the CAN management circuit, the wake-up judgment circuit is used to enable the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and enable the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit; The CAN transceiver circuit includes a first resistor, a second resistor, a third resistor and a CAN transceiver chip; The CAN management circuit includes a CAN management chip; A first end of the first resistor is connected to the MCU, and a second end of the first resistor is connected to the CAN transceiver chip; A first end of the second resistor is connected to the MCU, and a second end of the second resistor is connected to the CAN management chip; The CAN management chip is connected to the MCU and the CAN transceiver chip; The first end of the third resistor is connected to the power supply, and the second end of the third resistor is connected to the CAN transceiver chip; The CAN management circuit also includes a fourth resistor, a fifth resistor and a first transistor; A first end of the fourth resistor is connected to the MCU, and a second end of the fourth resistor is connected to the base of the first transistor; A first end of the fifth resistor is connected to the base of the first transistor, and a second end of the fifth resistor is connected to the emitter of the first transistor and is grounded; The collector of the first transistor is connected to the second end of the third resistor.

2. The instrument low power consumption management system according to claim 1, characterized in that: The wake-up judgment circuit includes a sixth resistor, a seventh resistor, a twelfth resistor and a second triode; The first end of the sixth resistor is connected to the vehicle end, and the second end of the sixth resistor is connected to the base of the second transistor; A first end of the seventh resistor is connected to the base of the second transistor, and a second end of the seventh resistor is connected to the emitter of the second transistor and is grounded; A first end of the twelfth resistor is connected to the MCU, and a second end of the twelfth resistor is connected to the emitter of the second transistor.

3. The instrument low power consumption management system according to claim 2, characterized in that: The wake-up judgment circuit also includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a third transistor; A first end of the eighth resistor is connected to a power source, and a second end of the eighth resistor is connected to a first end of the seventh resistor; A first end of the ninth resistor is connected to a power supply, and a second end of the ninth resistor is connected to the CAN management chip; The first end of the tenth resistor is connected to the second end of the ninth resistor, and the second end of the tenth resistor is connected to the base of the third transistor; A first end of the eleventh resistor is connected to the base of the third transistor, and a second end of the eleventh resistor is connected to the emitter of the third transistor and is grounded.

4. The instrument low power consumption management system according to claim 3, characterized in that: The wake-up judgment circuit also includes a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is connected to the vehicle end, and the cathode of the first diode is connected to the first end of the sixth resistor; An anode of the second diode is connected to the first end of the eighth resistor, and a cathode of the second diode is connected to the base of the second transistor; An anode of the third diode is connected to the second end of the ninth resistor, and a cathode of the third diode is connected to the first end of the tenth resistor; An anode of the fourth diode is connected to the second end of the ninth resistor, and a cathode of the fourth diode is connected to the CAN management chip.

5. The instrument low power consumption management system according to claim 1, characterized in that: Also includes: A level signal judgment circuit is connected to the MCU and the vehicle end.

6. The instrument low power consumption management system according to claim 5, characterized in that: The level signal judgment circuit includes a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a fourth transistor; A first end of the thirteenth resistor is connected to the vehicle end, and a second end of the thirteenth resistor is connected to the base of the fourth transistor; A first end of the fourteenth resistor is connected to the base of the fourth transistor, and a second end of the fourteenth resistor is connected to the emitter of the fourth transistor and is grounded; A first end of the fifteenth resistor is connected to a power supply, and a second end of the fifteenth resistor is connected to a collector of the fourth transistor; A first end of the sixteenth resistor is connected to the collector of the fourth transistor, and a second end of the sixteenth resistor is connected to the MCU.

7. The instrument low power consumption management system according to claim 1, characterized in that: The power management circuit includes a system power management module and an MCU function power management module; The system power management module is connected to the MCU and the vehicle end; The MCU functional power management module is connected to the MCU and the system power management module.

8. A low power consumption management method for an instrument, using the low power consumption management system for an instrument according to any one of claims 1 to 7, characterized in that: The following steps are involved: Power on the system; When the wake-up judgment circuit receives the first level signal from the vehicle end or the second level signal from the CAN management circuit, the wake-up judgment circuit enables the MCU to control the power management circuit to turn on the functional power domain of the MCU, and enables the MCU to control the CAN management circuit to turn on the message channel between the MCU and the CAN transceiver circuit; When the wake-up judgment circuit receives the second level signal from the vehicle end and the first level signal from the CAN management circuit, the wake-up judgment circuit causes the MCU to control the power management circuit to disconnect the functional power domain of the MCU, and causes the MCU to control the CAN management circuit to disconnect the message channel between the MCU and the CAN transceiver circuit.

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