Vehicle-mounted wake-up circuit and vehicle-mounted machine wake-up system

Abstract

The invention belongs to the field of vehicle-mounted system circuits, and particularly relates to a vehicle-mounted wake-up circuit and a vehicle-mounted machine wake-up system. A first input end of a first AND gate of a first wake-up circuit is connected with a first wake-up source, a second input end of the first AND gate is connected with an output end of a first diode, an input end of the first diode is connected with a voltage reference end, and an output end of the first diode is connected with a wake-up end of a vehicle-mounted power supply chip and the input end of the first AND gate; the first wake-up circuit is connected in parallel with at least one second wake-up circuit consistent with the first wake-up circuit in structure, meanwhile, a switching circuit is arranged, the enabling end of the switching circuit obtains an enabling signal through the AND gate output end, the connecting end of the switching circuit is connected with the voltage reference end, and the switching circuit changes the voltage state of the voltage reference end according to the enabling signal; through the AND gate and the diode, after the circuit is awakened for the first time and the switching circuit is turned on to enable the voltage reference end to change, other awakening circuits cannot interfere with an awakening signal, and meanwhile other awakening circuits are prevented from awakening the vehicle-mounted power supply chip.

Description

Technical Field

[0001] The present technology belongs to the field of vehicle-mounted system circuits, and in particular relates to a vehicle-mounted wake-up circuit and a vehicle-mounted wake-up system. Background Art

[0002] Common automotive ECUs have multiple wake-up sources (such as multi-channel CAN wake-up / Ethernet wake-up / KL15_ACC wake-up, etc.) to ensure that different modules and different wake-up sources can wake up the ECU in different situations to achieve related control and functions.

[0003] In the existing technology, only waking up the ECU is considered, so multiple wake-up sources are usually connected in parallel to the wake-up end. This results in that although any one of the wake-up sources can wake up the chip at the wake-up end, after wake-up, changes in other wake-up sources may cause secondary changes in the wake-up end, or secondary wake-up may cause circuit errors. This situation also makes it impossible for the existing technology to quickly and directly locate which channel is the priority for waking up the chip in the future. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a vehicle-mounted wake-up circuit and a vehicle-computer wake-up system, wherein the circuit adopts a combination of an AND gate and a diode. When one circuit is triggered, the voltage of one path of the AND gate is pulled down through a switching circuit, causing other wake-up circuits to be unable to continue to be triggered, and the triggered circuit is prevented from being pulled down by a diode, so that one circuit continues to output a wake-up signal while other circuits cannot be woken up.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a vehicle-mounted wake-up circuit for waking up a vehicle-mounted power chip, comprising:

[0007] A first wake-up circuit is provided with a first AND gate and a first diode, wherein a first input end of the first AND gate is connected to a first wake-up source, a second input end of the first AND gate is connected to an output end of the first diode, an input end of the first diode is connected to a voltage reference end, and an output end of the first diode is connected to a wake-up end of an on-board power chip and a second input end of the first AND gate;

[0008] A second wake-up circuit is provided with a second AND gate and a second diode, wherein a first input end of the second AND gate is connected to a second wake-up source, a second input end of the second AND gate is connected to one end of the second diode, the other end of the second diode is connected to a voltage reference end, and an output end is connected to a wake-up end of the vehicle power chip and a second input end of the second AND gate;

[0009] And a switch circuit, the enable end of the switch circuit is connected to the output end of the first AND gate and / or the second AND gate to obtain an enable signal, the connection end of the switch circuit is connected to the voltage reference end, and the switch circuit changes the voltage state of the voltage reference end of the connection end according to the enable signal.

[0010] The first input end of the first AND gate of the first wake-up circuit is connected to the first wake-up source, the second input end of the first AND gate is connected to the output end of the first diode, the input end of the first diode is connected to the voltage reference end, and the output end is connected to the wake-up end of the vehicle power chip and the input end of the first AND gate; and at least one second wake-up circuit with the same structure as the first wake-up circuit is connected in parallel, and a switch circuit is set at the same time, the enable end of the switch circuit obtains an enable signal through the output end of the AND gate, the connection end of the switch circuit is connected to the voltage reference end, and the switch circuit changes the voltage state of the voltage reference end according to the enable signal; through the AND gate and the diode, after the circuit is awakened for the first time and the switch circuit is turned on to change the voltage reference end, other wake-up circuits cannot interfere with the wake-up signal, and at the same time prevent other wake-up circuits from waking up the vehicle power chip.

[0011] In some embodiments, the first wake-up circuit is also provided with a fourth diode and a fifth diode; the input end of the fourth diode is connected to the output end of the first AND gate, the output end of the fourth diode is connected to the second input end of the first AND gate, the input end of the fifth diode is connected to the output end of the first AND gate, and the output end of the fifth diode is connected to the wake-up end of the vehicle power chip.

[0012] The first wake-up circuit is also provided with two diodes to respectively prevent the branch from the first AND gate output to the wake-up source and the branch from the first AND gate output to the second input end of the first AND gate from being reversed, so as to further prevent other wake-up circuits from interfering with the signal of the first wake-up circuit.

[0013] In some embodiments, the second wake-up circuit is further provided with a sixth diode and a seventh diode; the input end of the sixth diode is connected to the output end of the second AND gate, the output end of the sixth diode is connected to the second input end of the second AND gate, the input end of the seventh diode is connected to the output end of the second AND gate, and the output end of the seventh diode is connected to the wake-up end of the vehicle power chip.

[0014] The second wake-up circuit is further provided with two diodes to respectively prevent the branch from the second AND gate output to the wake-up source and the branch from the second AND gate output to the second input end of the second AND gate from being reversed, so as to further prevent other wake-up circuits from interfering with the signal of the second wake-up circuit.

[0015] In some embodiments, it further comprises:

[0016] At least one third wake-up circuit is provided with a third AND gate, wherein a first input end of the third AND gate is connected to a third wake-up source, a second input end of the third AND gate is connected to one end of a third diode, the other end of the third diode is connected to a voltage reference end, and an output end is connected to a wake-up end of the vehicle power chip and a second input end of the third AND gate;

[0017] The enable terminal of the switch circuit is connected to the output terminal of the first AND gate, and / or the output terminal of the second AND gate, and / or the output terminal of the third AND gate to obtain an enable signal.

[0018] In addition to the existing first wake-up circuit and the second wake-up circuit, more wake-up circuits can be set to provide wake-up nodes of more modules, making the wake-up mode more diversified.

[0019] In some embodiments, it also includes: the third wake-up circuit is also provided with an eighth diode and a ninth diode; the input end of the eighth diode is connected to the output end of the third AND gate, the output end of the eighth diode is connected to the second input end of the third AND gate, the input end of the ninth diode is connected to the output end of the third AND gate, and the output end of the ninth diode is connected to the wake-up end of the vehicle power chip.

[0020] The third wake-up circuit is further provided with two diodes to respectively prevent the branch from the third AND gate output to the wake-up source and the branch from the third AND gate output to the second input end of the third AND gate from being reversed, so as to further prevent other wake-up circuits from interfering with the signal of the third wake-up circuit.

[0021] In some embodiments, the first wake-up circuit is provided with a first detection terminal, and the first detection terminal is connected to the output terminal of the first AND gate; the second wake-up circuit is provided with a second detection terminal, and the second detection terminal is connected to the output terminal of the second AND gate; the third wake-up circuit is provided with a third detection terminal, and the third detection terminal is connected to the output terminal of the third AND gate.

[0022] A detection terminal is provided on each wake-up circuit, and the detection terminal can be monitored by an external device. When a voltage change is obtained, the wake-up signal can be directly detected through the detection terminal, and then the wake-up circuit can be directly located.

[0023] In some embodiments, the switch circuit is provided with a tenth diode and a MOS tube, the input end of the tenth diode is connected to the wake-up end of the vehicle power chip, the output end of the tenth diode is connected to the gate of the MOS tube, the gate of the MOS tube is an enable end, the source of the MOS tube is connected to the voltage reference end, and the drain of the MOS tube is grounded;

[0024] The switch circuit also includes a first capacitor, one end of which is connected to the output end of the tenth diode, and the other end of the first capacitor is grounded.

[0025] The tenth diode is used to prevent reverse flow, and a MOS tube is set to switch the circuit on and off to change the voltage state of the voltage reference end of the connection end, so that the potential of the second input end of the AND gate of the wake-up circuit changes.

[0026] In some embodiments, the voltage reference end is connected to a voltage reference circuit, and the voltage reference circuit is provided with a first resistor; one end of the first resistor is connected to an external power supply, and the other end of the first resistor is connected to a connection end of the switch circuit.

[0027] The external power input terminal is provided with a pull-up resistor to pull up the potential of the second input terminals of the first AND gate, the second AND gate, and the third AND gate, so that the second input terminals of the first AND gate, the second AND gate, and the third AND gate maintain a high potential under normal circumstances, so that when the wake-up signal is output, the AND gate can output the wake-up signal in time.

[0028] In some embodiments, the vehicle power chip further includes a first power output terminal and a second power output terminal; the first power output terminal and the second power output terminal are respectively connected to a first power input terminal and a second power input terminal of the MCU;

[0029] The wake-up end of the vehicle power chip is also provided with an eleventh diode, the output end of the eleventh diode is connected to the wake-up end, and the eleventh diode is connected to the output end of the first AND gate and the output end of the second AND gate.

[0030] After waking up, the vehicle power chip supplies power to the MCU to enable the wake-up source to control the vehicle wake-up circuit.

[0031] In a second aspect, the present invention proposes a vehicle computer wake-up system, comprising a vehicle-mounted wake-up circuit as proposed in any one of the first aspects, and the wake-up source comprises an ignition signal, a CAN bus wake-up signal, and an Ethernet wake-up signal.

[0032] The beneficial effects of the vehicle-mounted wake-up circuit and vehicle-mounted wake-up system of the present invention are:

[0033] The first input end of the first AND gate of the first wake-up circuit is connected to the first wake-up source, the second input end of the first AND gate is connected to the output end of the first diode, the input end of the first diode is connected to the voltage reference end, and the output end is connected to the wake-up end of the vehicle power chip and the input end of the first AND gate; and at least one second wake-up circuit with the same structure as the first wake-up circuit is connected in parallel, and a switch circuit is set at the same time, the enable end of the switch circuit obtains an enable signal through the output end of the AND gate, the connection end of the switch circuit is connected to the voltage reference end, and the switch circuit changes the voltage state of the voltage reference end according to the enable signal; so that in the multi-way wake-up circuit, through the AND gate and the diode, when the switch circuit is turned on after wake-up to make the voltage reference end change, the diode prevents the wake-up signal of the first wake-up circuit from changing, and realizes that other paths cannot be woken up. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A circuit framework diagram of a vehicle-mounted wake-up circuit of the present invention;

[0035] Figure 2 A circuit schematic diagram of a vehicle-mounted wake-up circuit of the present invention;

[0036] Figure 3 This is a framework diagram of the vehicle computer wake-up system of the present invention.

[0037] Reference numerals:

[0038] U1, first AND gate; U2, second AND gate; U3, third AND gate; U4, vehicle power chip; U5, MCU; U6, KL15_ACC; U7, CAN transceiver chip; U8, Ethernet transceiver chip;

[0039] U4_1, wake-up terminal; U4_2, first power output terminal; U4_3, second power output terminal;

[0040] U5_1, a first power input terminal; U5_2, a second power input terminal;

[0041] U6_1, the first wake-up source; U7_1, the second wake-up source; U8_1, the third wake-up source;

[0042] U1_1, a first input terminal of a first AND gate; U1_2, a second input terminal of the first AND gate;

[0043] U2_1, a first input terminal of a second AND gate; U2_2, a second input terminal of a second AND gate;

[0044] U3_1, a first input terminal of a third AND gate; U3_2, a second input terminal of the third AND gate;

[0045] R1, first resistor; C1, first capacitor; Q1, MOS tube;

[0046] D1, first diode; D2, second diode; D3, third diode; D4, fourth diode; D5, fifth diode; D6, sixth diode; D7, seventh diode; D8, eighth diode; D9, ninth diode; D10, tenth diode; D11, eleventh diode; VCC, voltage reference terminal;

[0047] A1, first detection end; A2, second detection end; A3, third detection end. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer definition of the protection scope of the present application.

[0049] Please refer to the drawings, where the same component symbols represent the same components, and the principles of the present application are illustrated by implementing them in an appropriate computing environment. The following description is based on the illustrated specific embodiments of the present application, which should not be considered as limiting other specific embodiments of the present application that are not described in detail herein.

[0050] The term "module" as used herein may be a software or hardware object executed on the computing system. The different components, modules, engines, and services described herein may be implementation objects on the computing system. The apparatus and methods described herein may be implemented in software, or in hardware, and all are within the scope of protection of this application.

[0051] 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.

[0052] In the description of this application, it should be noted that, 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] Embodiment 1:

[0054] like Figure 1-2 As shown, this embodiment proposes a vehicle-mounted wake-up circuit for waking up the vehicle-mounted power chip U4, including:

[0055] The first wake-up circuit is provided with a first AND gate U1 and a first diode D1. The second input terminal U1_1 of the first AND gate is connected to the first wake-up source U6_1. The second input terminal U1_2 of the first AND gate is connected to the output terminal of the first diode D1. The input terminal of the first diode D1 is connected to the voltage reference terminal VCC, and the output terminal is connected to the wake-up terminal U4_1 of the vehicle power chip U4 and the second input terminal U1_2 of the first AND gate.

[0056] The second wake-up circuit is provided with a second AND gate U2 and a second diode D2. The first input terminal U2_1 of the second AND gate is connected to the second wake-up source U7_1, the second input terminal U2_2 of the second AND gate is connected to one end of the second diode D2, the other end of the second diode D2 is connected to the voltage reference terminal VCC, and the output end is connected to the wake-up terminal U4_1 of the vehicle power chip U4 and the second input terminal U2_2 of the second AND gate;

[0057] And a switch circuit, the enable end of the switch circuit is connected to the output end of the first AND gate U1 and / or the second AND gate U2 to obtain an enable signal, the connection end of the switch circuit is connected to the voltage reference end VCC, and the switch circuit changes the voltage state of the voltage reference end VCC of the connection end according to the enable signal.

[0058] Specifically, the first wake-up circuit is provided with a first AND gate U1, and the two ends of the first AND gate U1 are respectively connected to the wake-up terminal U4_1 and the pull-up power supply, that is, the power reference terminal, so that the first AND gate U1 maintains one path at a high level in the normal non-awakened state. At the same time, a second wake-up circuit with the same structure as the first wake-up circuit is provided, and the second wake-up circuit has an independent wake-up source and can also be awakened separately. At the same time, one input end of the second AND gate U2 of the second wake-up circuit is also connected to the power reference terminal, so that one input end also maintains a high level input in the non-awakened state. The wake-up terminal U4_1 maintains a no-input state when in the non-awakened state, and maintains a high-level input state when in the awakened state, so that the first input end of the AND gate where the wake-up source is located is a high-level input, and when the normal second input end is high, the AND gate outputs a high-level wake-up signal. More specifically, the first and second AND gates can adopt TI's SN74LVC7001A-Q1 / SN74LVC1G08-Q1 related models to perform gate-related functions.

[0059] Furthermore, in order to prevent other paths from triggering the wake-up signal when the on-board chip is awakened, while outputting the wake-up signal, it is also output in parallel to the enable end of the switch circuit, so that the switch circuit is started by the wake-up signal, thereby changing the voltage reference end VCC, which can be changed from the original high-level output to the low-level output, or the high-level output to no output, or the high-level output to the lower high-voltage output, etc., and the change of the voltage reference end VCC can be achieved by pulling down the potential, switching the circuit, turning on the buck chip, etc. The purpose of changing the voltage reference end VCC is to change the second input end of the AND gate so that the second input end no longer maintains a high voltage input after awakening. In order to prevent interference from other paths, a diode is also set at the second input end. The role of the diode is that, in practical applications, for example, when the first wake-up circuit wakes up, the voltage reference terminal VCC changes due to the change of the switch circuit. At this time, it is usually preferred to pull the voltage reference terminal VCC from a high level to a low level. At this time, due to the existence of the first diode D1, the first diode D1 is cut off because it does not meet the conduction condition, resulting in the voltage being unable to be input from the first diode D1, and the output end of the first AND gate U1 is connected to the second input terminal U1_2 of the first AND gate, and the output end outputs a high level when awakened, which can maintain the high level input of the second input terminal. On the contrary, the second wake-up circuit that has not awakened has no input because the second input terminal U2_2 of the second AND gate is affected by the level change of the voltage reference terminal VCC. At this time, no matter what level the second wake-up circuit sends, it cannot change the output of the second AND gate U2, thereby achieving the function of relative cutoff.

[0060] Furthermore, the first diode D1 and the second diode D2 can be diodes of related models such as 1N4148 / 1N5189 / 1N4007.

[0061] The beneficial effect of this method is that the first wake-up circuit is provided with a first AND gate U1, the second input terminal U1_1 of the first AND gate is connected to the first wake-up source U6_1, the second input terminal U1_2 of the first AND gate is connected to the output terminal of the first diode D1, the input terminal of the first diode D1 is connected to the voltage reference terminal VCC, and the output terminal is connected to the wake-up terminal U4_1 of the vehicle power chip U4 and the input terminal of the first AND gate U1; and at least one second wake-up circuit with the same structure as the first wake-up circuit is connected in parallel, and a switch circuit is provided at the same time, the enable terminal of the switch circuit is connected to the output terminal of the first AND gate U1 and / or the second AND gate U2 to obtain an enable signal, the connection terminal of the switch circuit is connected to the voltage reference terminal VCC, and the switch circuit changes the voltage state of the voltage reference terminal VCC of the connection terminal according to the enable signal. Through the AND gate and the diode, after the circuit is first awakened and the switch circuit is turned on to change the voltage reference terminal VCC, other wake-up circuits cannot interfere with the wake-up signal, and other wake-up circuits are prevented from waking up the vehicle power chip.

[0062] Embodiment 2:

[0063] Please refer to Figure 2 As shown, based on Example 1, this embodiment further optimizes and illustrates the circuit structure proposed in Example 1.

[0064] In some embodiments, the first wake-up circuit is also provided with a fourth diode D4 and a fifth diode D5; the input end of the fourth diode D4 is connected to the output end of the first AND gate U1, the output end of the fourth diode D4 is connected to the second input end U1_2 of the first AND gate, the input end of the fifth diode D5 is connected to the output end of the first AND gate U1, and the output end of the fifth diode D5 is connected to the wake-up end U4_1 of the vehicle power chip U4.

[0065] Specifically, in order to ensure the effect as described in Example 1, a fourth diode D4 is further provided in the first wake-up circuit, and the fourth diode D4 is provided on a branch connecting the output end of the first AND gate U1 to the second input end U1_2 of the first AND gate, so as to prevent the circuit from being reversed, and prevent the voltage from flowing back into the input end of the first AND gate U1 due to the high level input of the voltage reference end VCC when the output end of the first AND gate U1 stops waking up. The fifth diode D5 is provided at the output end of the first AND gate U1, so as to flow back into the input end of the first AND gate U1 when other circuits output the wake-up signal.

[0066] Furthermore, the fourth diode D4 and the fifth diode D5 can be diodes of related models such as 1N4148 / 1N5189 / 1N4007.

[0067] The first wake-up circuit is further provided with two diodes to respectively prevent the branch from the first AND gate U1 outputting to the wake-up source and the branch from the first AND gate U1 outputting to the second input terminal U1_2 of the first AND gate from being reversed, thereby further preventing other wake-up circuits from interfering with the signal of the first wake-up circuit.

[0068] In some embodiments, the second wake-up circuit is further provided with a sixth diode D6 and a seventh diode D7; the input end of the sixth diode D6 is connected to the output end of the second AND gate U2, the output end of the sixth diode D6 is connected to the second input end U2_2 of the second AND gate, the input end of the seventh diode D7 is connected to the output end of the second AND gate U2, and the output end of the seventh diode D7 is connected to the wake-up end U4_1 of the vehicle power chip U4.

[0069] Specifically, in order to ensure the effect as described in Example 1, a sixth diode D6 is further provided in the second wake-up circuit, and the sixth diode D6 is provided on a branch where the output end of the second AND gate U2 is connected to the second input end U2_2 of the second AND gate, so as to prevent the circuit from being reversed, and prevent the voltage from flowing back into the input end of the second AND gate U2 due to the high level input of the voltage reference end VCC when the output end of the second AND gate U2 stops waking up. The seventh diode D7 is provided at the output end of the second AND gate U2, so as to prevent the voltage from flowing back into the input end of the second AND gate U2 when other circuits output the wake-up signal.

[0070] Furthermore, the sixth diode D6 and the seventh diode D7 can be diodes of related models such as 1N4148 / 1N5189 / 1N4007.

[0071] The second wake-up circuit is further provided with two diodes to respectively prevent the branch from the second AND gate U2 outputting to the wake-up source and the branch from the second AND gate U2 outputting to the second input terminal U2_2 of the second AND gate from being reversed, thereby further preventing other wake-up circuits from interfering with the signal of the second wake-up circuit.

[0072] In some embodiments, it also includes:

[0073] At least one third wake-up circuit is provided with a third AND gate U3, wherein a first input terminal U3_1 of the third AND gate is connected to a third wake-up source U8_1, a second input terminal U3_2 of the third AND gate is connected to one end of a third diode D3, the other end of the third diode D3 is connected to a voltage reference terminal VCC, and an output terminal is connected to a wake-up terminal U4_1 of an onboard power chip U4 and a second input terminal U3_2 of the third AND gate;

[0074] The enable terminal of the switch circuit is connected to the output terminal of the first AND gate U1, and / or the output terminal of the second AND gate U2, and / or the output terminal of the third AND gate U3 to obtain an enable signal.

[0075] Specifically, in order to make the wake-up source more diverse, a plurality of other wake-up circuits are further provided. The structures of the other wake-up circuits can adopt wake-up circuits with the same structure as the first wake-up circuit and the second wake-up circuit and be connected to the circuit.

[0076] More specifically, the third diode D3 may be a diode of a related model such as 1N4148 / 1N5189 / 1N4007. The third AND gate U3 may be a diode of a related model such as SN74LVC7001A-Q1 / SN74LVC1G08-Q1 of TI to perform functions related to the AND gate.

[0077] In addition to the existing first wake-up circuit and the second wake-up circuit, more wake-up circuits can be set to provide wake-up nodes of more modules, making the wake-up mode more diversified.

[0078] In some embodiments, the third wake-up circuit is further provided with an eighth diode D8 and a ninth diode D9; the input end of the eighth diode D8 is connected to the output end of the third AND gate U3, the output end of the eighth diode D8 is connected to the second input end U3_2 of the third AND gate, the input end of the ninth diode D9 is connected to the output end of the third AND gate U3, and the output end of the ninth diode D9 is connected to the wake-up end U4_1 of the vehicle power chip U4.

[0079] Specifically, in order to ensure the effect as described in Example 1, an eighth diode D8 is further provided in the third wake-up circuit, and a ninth diode D9 is provided on a branch where the output end of the third AND gate U3 is connected to the second input end U3_2 of the third AND gate, so as to prevent the circuit from being reversed, and prevent the voltage from flowing back into the input end of the third AND gate U3 due to the high level input of the voltage reference end VCC when the output end of the third AND gate U3 stops waking up. The ninth diode D9 is provided at the output end of the third AND gate U3, so as to flow back into the input end of the third AND gate U3 when other circuits output the wake-up signal.

[0080] Furthermore, the eighth diode D8 and the ninth diode D9 can be diodes of related models such as 1N4148 / 1N5189 / 1N4007.

[0081] The beneficial effect of this method is that the third wake-up circuit is also provided with two diodes, which respectively prevent the branch from the third AND gate U3 output to the wake-up source and the branch from the third AND gate U3 output to the second input terminal U3_2 of the third AND gate from being reversed, thereby further preventing other wake-up circuits from interfering with the signal of the third wake-up circuit.

[0082] In some embodiments, the first wake-up circuit is provided with a first detection terminal A1, which is connected to the output terminal of the first AND gate U1; the second wake-up circuit is provided with a second detection terminal A2, which is connected to the output terminal of the second AND gate U2; the third wake-up circuit is provided with a third detection terminal A3, which is connected to the output terminal of the third AND gate U3.

[0083] Specifically, each wake-up circuit has a detection terminal, so that when the wake-up signal is sent, the detection terminal detects the wake-up circuit that is awakened for the first time, and can intuitively determine the wake-up circuit that is awakened first. The detection terminal can be monitored by a chip that can detect analog signals.

[0084] The beneficial effect of this method is that a detection terminal is provided on each wake-up circuit, and the detection terminal can be monitored by an external device. When a voltage change is obtained, the wake-up signal can be directly detected by the detection terminal, and the wake-up circuit can be directly located.

[0085] In some embodiments, the switch circuit is provided with a tenth diode D10 and a MOS tube Q1, the input end of the tenth diode D10 is connected to the wake-up end U4_1 of the vehicle power chip U4, the output end of the tenth diode D10 is connected to the gate of the MOS tube Q1, the gate of the MOS tube Q1 is an enable end, the source of the MOS tube Q1 is connected to the voltage reference end VCC, and the drain of the MOS tube Q1 is grounded;

[0086] The switch circuit further includes a first capacitor C1 , one end of the first capacitor C1 is connected to the output end of the tenth diode D10 , and the other end of the first capacitor C1 is grounded.

[0087] Specifically, the switch circuit is provided with a tenth diode D10 and a MOS transistor Q1, wherein the tenth diode D10 is used to prevent circuit backflow, and when the MOS transistor Q1 is turned on, the voltage reference terminal VCC is grounded to lower the potential, thereby realizing a level change of the circuit connected to the voltage reference terminal VCC. The first capacitor C1 can stabilize the signal to prevent the input of an unstable signal from causing instability of the enable terminal, thereby causing instability in the on and off of the MOS transistor Q1.

[0088] More specifically, the tenth diode D10 can be a diode of a related model such as 1N4148 / 1N5189 / 1N4007. The first capacitor C1 can be a capacitor with a capacitance parameter of 100Nf / 16V. The MOS tube Q1 can be a general N-mosfet model, such as S-LBSS139LT1G.

[0089] The effect of this method is that the tenth diode D10 is used to prevent reverse flow, and the MOS tube Q1 is set to switch the circuit on and off to change the voltage state of the voltage reference terminal VCC of the connection end, so that the potential of the second input terminal of the AND gate of the wake-up circuit changes.

[0090] In some embodiments, the voltage reference terminal VCC is connected to a voltage reference circuit, and the voltage reference circuit is provided with a first resistor R1; one end of the first resistor R1 is connected to an external power supply, and the other end of the first resistor R1 is connected to a connection end of the switch circuit.

[0091] Specifically, the voltage reference circuit is provided with a first resistor R1 , and the first resistor R1 can be used as a pull-up resistor, and more specifically, a resistor of about 10KΩ is used.

[0092] The effect of this method is that a pull-up resistor is provided at the external power input terminal to pull up the potential of the second input terminal U1_2 of the first AND gate, the second input terminal U2_2 of the second AND gate, and the second input terminal U3_2 of the third AND gate, so that the second input terminal U1_2 of the first AND gate, the second input terminal U2_2 of the second AND gate, and the second input terminal U3_2 of the third AND gate maintain a high potential under normal circumstances, so that when the wake-up signal is output, the AND gate can output the wake-up signal in time.

[0093] In some embodiments, the vehicle power chip U4 further includes a first power output terminal U4_2 and a second power output terminal U4_3; the first power output terminal U4_2 and the second power output terminal U4_3 are respectively connected to the first power input terminal U5_1 and the second power input terminal U5_2 of the MCU U5;

[0094] The wake-up terminal U4_1 of the vehicle power chip U4 is further provided with an eleventh diode D11, the output end of the eleventh diode D11 is connected to the wake-up terminal U4_1, and the eleventh diode D11 is connected to the output end of the first AND gate U1 and the output end of the second AND gate U2.

[0095] Specifically, the vehicle power chip U4 is usually a PMIC primary power chip, which is provided with a wake-up terminal U4_1 and an eleventh diode D11 for protection. At the same time, two power output terminals are provided to supply the MCU U5, the first power output terminal U4_2 is a 3.3V output, and the second power output terminal U4_3 is a 1.25V output. It can be understood that the PMIC primary power chip is not limited to the above-mentioned connection terminals, but also has other connection terminals, which will not be described in detail in this embodiment.

[0096] The beneficial effect of this method is that after being awakened, the vehicle power chip U4 supplies power to the MCU U5 to realize the control of the vehicle wake-up circuit by the wake-up source.

[0097] Embodiment 3:

[0098] like Figure 3 As shown, based on Embodiment 1 and Embodiment 2, this embodiment proposes a vehicle machine wake-up system of the present invention.

[0099] In some embodiments, the present invention proposes a vehicle computer wake-up system, including a vehicle-mounted wake-up circuit as proposed in any one of Embodiments 1 and 2, and the wake-up source includes an ignition signal (KL15_ACCU6) from vehicle ignition, a CAN bus wake-up signal from a CAN transceiver chip U7, an Ethernet wake-up signal from an Ethernet transceiver chip U8, etc. It can be understood that the above wake-up sources are only some of the wake-up sources. In actual operation, multiple wake-up sources and wake-up circuits can be set according to actual needs. This embodiment only lists some of the commonly used wake-up sources.

[0100] The implementation modes of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present application.

Claims

1. A vehicle-mounted wake-up circuit, characterized in that: Used to wake up the vehicle power chip, including: A first wake-up circuit is provided with a first AND gate and a first diode, wherein a first input end of the first AND gate is connected to a first wake-up source, a second input end of the first AND gate is connected to an output end of the first diode, an input end of the first diode is connected to a voltage reference end, and an output end of the first diode is connected to a wake-up end of an on-board power chip and a second input end of the first AND gate; A second wake-up circuit is provided with a second AND gate and a second diode, wherein a first input end of the second AND gate is connected to a second wake-up source, a second input end of the second AND gate is connected to one end of the second diode, the other end of the second diode is connected to a voltage reference end, and an output end is connected to a wake-up end of an on-board power supply chip and a second input end of the second AND gate; and a switch circuit, wherein an enable terminal of the switch circuit is connected to an output terminal of the first AND gate and / or the second AND gate to obtain an enable signal, a connection terminal of the switch circuit is connected to the voltage reference terminal, and the switch circuit changes a voltage state of a voltage reference terminal of the connection terminal according to the enable signal.

2. The vehicle-mounted wake-up circuit according to claim 1, characterized in that: The first wake-up circuit is also provided with a fourth diode and a fifth diode; the input end of the fourth diode is connected to the output end of the first AND gate, the output end of the fourth diode is connected to the second input end of the first AND gate, the input end of the fifth diode is connected to the output end of the first AND gate, and the output end of the fifth diode is connected to the wake-up end of the vehicle power chip.

3. The vehicle-mounted wake-up circuit according to claim 1, characterized in that: The second wake-up circuit is also provided with a sixth diode and a seventh diode; the input end of the sixth diode is connected to the output end of the second AND gate, the output end of the sixth diode is connected to the second input end of the second AND gate, the input end of the seventh diode is connected to the output end of the second AND gate, and the output end of the seventh diode is connected to the wake-up end of the vehicle power chip.

4. The vehicle-mounted wake-up circuit according to claim 1, characterized in that: Also includes: At least one third wake-up circuit is provided with a third AND gate, wherein a first input end of the third AND gate is connected to a third wake-up source, a second input end of the third AND gate is connected to one end of a third diode, the other end of the third diode is connected to a voltage reference end, and an output end is connected to a wake-up end of an on-board power chip and a second input end of the third AND gate; The enable terminal of the switch circuit is connected to the output terminal of the first AND gate, and / or the output terminal of the second AND gate, and / or the output terminal of the third AND gate to obtain an enable signal.

5. The vehicle-mounted wake-up circuit according to claim 4, characterized in that: Also includes: The third wake-up circuit is also provided with an eighth diode and a ninth diode; the input end of the eighth diode is connected to the output end of the third AND gate, the output end of the eighth diode is connected to the second input end of the third AND gate, the input end of the ninth diode is connected to the output end of the third AND gate, and the output end of the ninth diode is connected to the wake-up end of the vehicle power chip.

6. The vehicle-mounted wake-up circuit according to claim 4, characterized in that: The first wake-up circuit is provided with a first detection end, and the first detection end is connected to the output end of the first AND gate; the second wake-up circuit is provided with a second detection end, and the second detection end is connected to the output end of the second AND gate; the third wake-up circuit is provided with a third detection end, and the third detection end is connected to the output end of the third AND gate.

7. The vehicle-mounted wake-up circuit according to claim 1, characterized in that: The switch circuit is provided with a tenth diode and a MOS tube, the input end of the tenth diode is connected to the wake-up end of the vehicle power chip, the output end of the tenth diode is connected to the gate of the MOS tube, the gate of the MOS tube is the enable end, the source of the MOS tube is connected to the voltage reference end, and the drain of the MOS tube is grounded; The switch circuit further includes a first capacitor, one end of which is connected to the output end of the tenth diode, and the other end of which is grounded.

8. The vehicle-mounted wake-up circuit according to claim 1, characterized in that: The voltage reference end is connected to a voltage reference circuit, and the voltage reference circuit is provided with a first resistor; one end of the first resistor is connected to an external power supply, and the other end of the first resistor is connected to the connection end of the switch circuit.

9. The vehicle-mounted wake-up circuit according to claim 1, characterized in that: The vehicle power chip also includes a first power output terminal and a second power output terminal; the first power output terminal and the second power output terminal are respectively connected to the first power input terminal and the second power input terminal of the MCU; The wake-up end of the vehicle power chip is also provided with an eleventh diode, the output end of the eleventh diode is connected to the wake-up end, and the eleventh diode is connected to the output end of the first AND gate and the output end of the second AND gate.

10. A vehicle computer wake-up system, characterized in that: It comprises the vehicle-mounted wake-up circuit as described in any one of claims 1 to 9, and the wake-up source comprises an ignition signal, a CAN bus wake-up signal, and an Ethernet wake-up signal.

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