Wake-up circuit and vehicle

Abstract

The application provides a kind of wake-up circuit.The passive wake-up module of wake-up circuit, the first signal input end of comparison unit is connected passive wake-up signal input end, the first signal output end of comparison unit is connected the control end of second switch, one end of second switch is connected ground and the other end is connected the base of triode, one end of tenth resistance, the first connection end of third capacitor and the second signal input end of comparison unit;The emitter of triode is connected power supply, the collector is connected the other end of tenth resistance;The second connection end of third capacitor is connected ground;One end of fourth resistance is connected power supply, the other end is connected one end of fifth resistance and the second reference signal input end of comparison unit;The other end of fifth resistance is connected ground;Wherein, by adjusting the resistance value of fourth resistance and fifth resistance, the wake-up time of input signal of passive wake-up signal input end is adjusted.The application also provides a kind of car including wake-up circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a wake-up circuit and an automobile. BACKGROUND

[0002] There are many controllers on new energy vehicles. Due to the limited capacity of the vehicle battery, all controllers cannot be kept in a wake-up state at all times. Therefore, in order to save power, the controllers need to be put into hibernation and wake-up operation. When there is no demand for the controller, the controller can be put into hibernation state, and when it is needed to play a function, the controller can be woken up.

[0003] The existing wake-up circuit cannot flexibly adjust the wake-up threshold and time, and cannot meet the needs of different application backgrounds. Moreover, the active wake-up has the risk of inaccurate wake-up signal leading to false wake-up. SUMMARY

[0004] One of the purposes of the present application is to provide a wake-up circuit, the passive wake-up time of which is adjustable, so that it can be flexibly configured according to the wake-up demand, and can meet the wake-up demand in different scenarios. The present application also provides an automobile.

[0005] In order to achieve the above object, the present application provides a wake-up circuit. The wake-up circuit comprises a passive wake-up module; the passive wake-up module comprises a comparison unit, a second switch, a transistor, a tenth resistor, a third capacitor, a fourth resistor and a fifth resistor; a first signal input end of the comparison unit is connected with a passive wake-up signal input end, the comparison unit outputs corresponding signals from a first signal output end of the comparison unit after comparing input signals of the first signal input end with reference signals of a first reference signal input end of the comparison unit; a control end of the second switch is connected with the first signal output end of the comparison unit, a first connection end of the second switch is grounded, a second connection end of the second switch is connected with a base of the transistor, one end of the tenth resistor, a first connection end of the third capacitor and a second signal input end of the comparison unit; an emitter of the transistor is connected with a power supply, a collector of the transistor is connected with the other end of the tenth resistor; a second connection end of the third capacitor is grounded; one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor is connected with one end of the fifth resistor and a second reference signal input end of the comparison unit; the other end of the fifth resistor is grounded, the power supply voltage is input to the second reference signal input end of the comparison unit after being divided by the fourth resistor and the fifth resistor; the comparison unit outputs corresponding signals from a second signal output end of the comparison unit to a passive wake-up signal output end after comparing input signals of the second signal input end with reference signals of the second reference signal input end; wherein the wake-up time of the input signals of the passive wake-up signal input end is adjusted by adjusting the resistance values of the fourth resistor and the fifth resistor.

[0006] Optionally, when the control end of the second switch is a high-level signal, the first connection end and the second connection end of the second switch are turned on.

[0007] Optionally, the passive wake-up module further comprises an eighth resistor and a ninth resistor; one end of the eighth resistor is connected with the emitter of the transistor to the same power supply, the other end of the eighth resistor is connected with one end of the ninth resistor and the base of the transistor; the other end of the ninth resistor is connected with the second connection end of the second switch.

[0008] Optionally, the passive wake-up module further comprises an eleventh resistor and a twelfth resistor; one end of the eleventh resistor is connected with the first connection end of the third capacitor, the other end of the eleventh resistor is connected with one end of the twelfth resistor and the second signal input end of the comparison unit, the other end of the twelfth resistor is grounded.

[0009] Optionally, the passive wake-up module further comprises a third switch and a thirteenth resistor; a control end of the third switch is connected with a second connection end of the second switch, a first connection end of the third switch is grounded, a second connection end of the third switch is connected with one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected with a first connection end of the third capacitor; when the control end of the third switch is a high-level signal, the first connection end and the second connection end of the third switch are turned on.

[0010] Optionally, the passive wake-up module further comprises a sixth resistor and a seventh resistor; one end of the seventh resistor is connected with the passive wake-up signal input end, the other end of the seventh resistor is connected with one end of the sixth resistor and a first signal input end of the comparison unit, and the other end of the sixth resistor is grounded.

[0011] Optionally, the passive wake-up module further comprises a second resistor and a third resistor; one end of the second resistor is connected with a power supply, the other end of the second resistor is connected with one end of the third resistor and a first reference signal input end of the comparison unit, and the other end of the third resistor is grounded.

[0012] Optionally, the wake-up circuit further comprises an active wake-up module; the active wake-up module comprises a first switch and a first resistor; a control end of the first switch is connected with an active wake-up signal input end, a first connection end of the first switch is connected with a power supply, a second connection end of the first switch is connected with one end of the first resistor and an active wake-up signal output end, and the other end of the first resistor is connected with a signal back-end; by detecting an output signal of the signal back-end, an output signal of the active wake-up signal output end can be monitored.

[0013] Optionally, the active wake-up module further comprises a first capacitor; one end of the first capacitor is connected with the other end of the first resistor together with the signal back-end, and the other end of the first capacitor is grounded.

[0014] Optionally, the wake-up circuit comprises a first port; the passive wake-up module and the active wake-up module share the first port, and the first port serves as the passive wake-up signal input end and the active wake-up signal output end.

[0015] Optionally, the wake-up circuit comprises a second capacitor and an electrostatic protection diode; one end of the second capacitor and one end of the electrostatic protection diode are connected with the first port, and the other end of the second capacitor and the other end of the electrostatic protection diode are grounded.

[0016] Optionally, the comparison unit comprises a dual-channel voltage comparator.

[0017] Another aspect of the present application also provides an automobile. The automobile comprises a plurality of controllers and a wake-up circuit as described above, the wake-up circuit comprising a passive wake-up module, one of the controllers inputs a signal into a passive wake-up signal input end of the passive wake-up module, and a signal output by a passive wake-up signal output end of the passive wake-up module wakes up other controllers in the automobile.

[0018] The wake-up circuit and the automobile provided by the present application comprise a passive wake-up module, the passive wake-up module comprises a comparison unit, a second switch, a triode, a tenth resistor, a third capacitor, a fourth resistor and a fifth resistor. Since the second signal input end of the comparison unit is connected with the first connection end of the third capacitor, the voltage of the second signal input end of the comparison unit is equal to the real-time voltage of the first connection end of the third capacitor. In the present application, the input signal of the passive wake-up signal input end controls the second switch, the second switch controls the power supply, the triode and the tenth resistor to charge the third capacitor, the power supply voltage is input into the second reference signal input end of the comparison unit after being divided by the fourth resistor and the fifth resistor, the threshold value of the flip level of the second signal output end of the comparison unit can be adjusted by adjusting the resistance values of the fourth resistor and the fifth resistor, the time for the second signal input end of the comparison unit to reach the threshold value of the flip level can be adjusted by using the third capacitor to charge to the threshold value of the flip level, so as to realize the adjustment of the wake-up time of the input signal of the passive wake-up signal input end. Since the automobile needs to perform some preparation actions, such as system self-checking actions, before being woken up, the wake-up time of the input signal of the passive wake-up signal input end can be adjusted, so that the wake-up requirement can be flexibly configured according to different wake-up requirements, and the wake-up requirement in different scenarios can be met.

[0019] Further, the wake-up circuit further comprises an active wake-up module, the active wake-up module comprises a first switch and a first resistor, the control end of the first switch is connected with the active wake-up signal input end, the first connection end of the first switch is connected with the power supply, the second connection end of the first switch is connected with one end of the first resistor and the active wake-up signal output end, the other end of the first resistor is connected with the signal back sampling end, the output signal of the active wake-up signal output end can be monitored by detecting the output signal of the signal back sampling end, so that the abnormality of the output signal of the active wake-up signal output end can be found in time and adjusted in time, which is beneficial to ensuring the accuracy of the active wake-up signal output end signal and improving the reliability and accuracy of the active wake-up function. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The schematic diagram of the passive wake-up module of the wake-up circuit provided by an embodiment of the present application.

[0021] Figure 2 The schematic diagram of the active wake-up module of the wake-up circuit provided by an embodiment of the present application.

[0022] Figure 3 A schematic diagram of a wake-up circuit provided for an embodiment of the present application. DETAILED DESCRIPTION

[0023] The wake-up circuit and the automobile according to the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description. It should be noted that the accompanying drawings are very simplified and use non-precise proportions, only for the purpose of conveniently and clearly assisting the description of the embodiments of the present application.

[0024] In order to improve the flexibility of the wake-up action and meet the wake-up requirements in different scenarios, the present embodiment provides a wake-up circuit. The wake-up circuit comprises a passive wake-up module, and the passive wake-up module comprises a comparison unit, a second switch, a triode, a tenth resistor, a third capacitor, a fourth resistor and a fifth resistor.

[0025] The first signal input end of the comparison unit is connected with the passive wake-up signal input end. The comparison unit compares the input signal of the first signal input end with the reference signal of the first reference signal input end of the comparison unit and then outputs the corresponding signal from the first signal output end of the comparison unit. The control end of the second switch is connected with the first signal output end of the comparison unit. The first connection end of the second switch is grounded. The second connection end of the second switch is connected with the base of the triode, one end of the tenth resistor, the first connection end of the third capacitor and the second signal input end of the comparison unit. The emitter of the triode is connected with a power supply. The collector of the triode is connected with the other end of the tenth resistor. The second connection end of the third capacitor is grounded. One end of the fourth resistor is connected with the power supply. The other end of the fourth resistor is connected with one end of the fifth resistor and the second reference signal input end of the comparison unit. The other end of the fifth resistor is grounded. The power supply voltage is divided by the fourth resistor and the fifth resistor and then input to the second reference signal input end of the comparison unit. The comparison unit compares the input signal of the second signal input end with the reference signal of the second reference signal input end and then outputs the corresponding signal from the second signal output end of the comparison unit to the passive wake-up signal output end. The resistance values of the fourth resistor and the fifth resistor are adjusted to adjust the wake-up time of the input signal of the passive wake-up signal input end.

[0026] In the present application, the voltage of the second signal input end of the comparison unit is equal to the real-time voltage of the first connection end of the third capacitor, since the second signal input end of the comparison unit is connected with the first connection end of the third capacitor. In the present application, the input signal of the passive wake-up signal input end controls the second switch, and the second switch controls the power supply, the transistor and the tenth resistor to charge the third capacitor. The power supply voltage is input to the second reference signal input end of the comparison unit after being divided by the fourth resistor and the fifth resistor. The threshold value of the flip level of the second signal output end of the comparison unit can be adjusted by adjusting the resistance values of the fourth resistor and the fifth resistor. The time for the second signal input end of the comparison unit to reach the threshold value of the flip level is adjusted by using the third capacitor to charge to reach the threshold value of the flip level, so as to realize the wake-up time adjustment of the input signal of the passive wake-up signal input end. Since the controller needs to perform some preparation actions, such as system self-checking actions, before being woken up, the wake-up time of the input signal of the passive wake-up signal input end is adjustable, so that flexible configuration can be performed according to different wake-up requirements, and the wake-up requirements in different scenes can be met.

[0027] Figure 1 A schematic diagram of the passive wake-up module of the wake-up circuit is provided for an embodiment of the present application. As shown in Figure 1 The comparison unit can include a dual-channel voltage comparator U1, so that the circuit can be simplified. In other embodiments, the comparison unit can include two comparators.

[0028] As shown in Figure 1 The comparison unit has a first signal input end VP1, a second signal input end VP2, a first reference signal input end VM1, a second reference signal input end VM2, a first signal output end VS1 and a second signal output end VS2.

[0029] The first signal input end VP1 of the comparison unit is connected with the passive wake-up signal input end. In the present embodiment, the wake-up circuit can be arranged in a vehicle, and is used to wake up a controller in the vehicle. For example, a first controller of the vehicle can input a signal to the passive wake-up signal input end of the wake-up circuit, so as to wake up other controllers through the passive wake-up module of the wake-up circuit. The other controllers can be controllers other than the first controller.

[0030] Continuing to refer to Figure 1 The passive wake-up module can further include a sixth resistor R6 and a seventh resistor R7. One end of the seventh resistor R7 is connected with the passive wake-up signal input end, the other end of the seventh resistor R7 is connected with one end of the sixth resistor R6 and the first signal input end VP1 of the comparison unit, and the other end of the sixth resistor R6 is grounded. The sixth resistor R6 and the seventh resistor R7 are used to adjust the voltage of the first signal input end VP1. The voltage of the first signal input end VP1 is R6 is the resistance value of the sixth resistor R6, R7 is the resistance value of the seventh resistor R7, V in is the voltage of the input signal of the passive wake-up signal input end.

[0031] The passive wake-up module can further include a second capacitor C2 and an electrostatic protection diode D1, one end of the second capacitor C2 and one end of the electrostatic protection diode D1 are connected with the passive wake-up signal input end, the other end of the second capacitor C2 and the other end of the electrostatic protection diode D1 are grounded. The second capacitor C2 is a filter capacitor. The electrostatic protection diode D1 is used for electrostatic protection of the wake-up circuit.

[0032] The passive wake-up module can further include a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected with the power supply UBR, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the first reference signal input end VM1 of the comparison unit, the other end of the third resistor R3 is grounded. The second resistor R2 and the third resistor R3 are used for adjusting the voltage of the first reference signal input end VM1, after being divided by the second resistor R2 and the third resistor R3, the voltage of the first reference signal input end VM1 is R2 is the resistance value of the second resistor R2, R3 is the resistance value of the third resistor R3, V DD5 is the voltage of the power supply UBR.

[0033] The comparison unit outputs corresponding signals from the first signal output end VS1 after comparing the input signal of the first signal input end VP1 and the reference signal of the first reference signal input end VM1. For example, the comparison unit compares the voltages of the first signal input end VP1 and the first reference signal input end VM1, if the voltage V VP1 of the first signal input end VP1 is greater than the voltage V VM1 of the first reference signal input end VM1, i.e. V VP1 > V VM1 , , the first signal output end VS1 outputs a high level signal; if the voltage V VP1 of the first signal input end VP1 is less than the voltage V VM1 of the first reference signal input end VM1, i.e. VP1 < VM1, , the first signal output end VS1 outputs a low level signal.

[0034] It should be noted that the flip level threshold value of the first signal output end of the comparison unit is By adjusting the resistance values of the second resistor R2, the third resistor R3, the sixth resistor R6 and / or the seventh resistor R7, the flip level threshold value of the first signal output end of the comparison unit can be adjusted, i.e. the wake-up threshold value of the input signal of the passive wake-up signal input end is indirectly adjusted, achieving the purpose of adjusting the wake-up threshold value.

[0035] With reference to the foregoing Figure 1 As shown, the control terminal of the second switch M2 is connected with the first signal output terminal VS1 of the comparison unit, the first connection terminal of the second switch M2 is grounded, and the second connection terminal of the second switch M2 is connected with the base of the triode Q1, one end of the tenth resistor R10, the first connection terminal of the third capacitor C3, and the second signal input terminal VP2 of the comparison unit; the emitter of the triode Q1 is connected with the power supply VDD5, and the collector of the triode Q1 is connected with the other end of the tenth resistor R10, and the second connection terminal of the third capacitor C3 is grounded.

[0036] Specifically, the passive wake-up module can further include an eighth resistor R8 and a ninth resistor R9. One end of the eighth resistor R8 is connected with the emitter of the triode Q1 and the same power supply VDD5, the other end of the eighth resistor R8 is connected with one end of the ninth resistor R9 and the base of the triode Q1, and the other end of the ninth resistor R9 is connected with the second connection terminal of the second switch M2. The eighth resistor R8 and the ninth resistor R9 divide the voltage of the base of the triode Q1, and the voltage of the base of the triode Q1 is R8 is the resistance value of the eighth resistor R8, R9 is the resistance value of the ninth resistor R9, V DD5 is the voltage of the power supply VDD5.

[0037] With reference to the foregoing Figure 1 As shown, the passive wake-up module can further include a third switch M3 and a thirteenth resistor R13. The control terminal of the third switch M3 is connected with the second connection terminal of the second switch M2, the first connection terminal of the third switch M3 is grounded, and the second connection terminal of the third switch M3 is connected with one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected with the first connection terminal of the third capacitor C3. The voltage signal on the third capacitor C3 can be quickly discharged to the ground through the thirteenth resistor R13 and the third switch M3, thereby improving the accuracy of the secondary wake-up.

[0038] The passive wake-up module can further include an eleventh resistor R11 and a twelfth resistor R12. One end of the eleventh resistor R11 is connected with the first connection terminal of the third capacitor C3, the other end of the eleventh resistor R11 is connected with one end of the twelfth resistor R12 and the second signal input terminal VP2 of the comparison unit, and the other end of the twelfth resistor R12 is grounded. The eleventh resistor R11 and the twelfth resistor R12 divide the voltage of the second signal input terminal VP2 of the comparison unit, and the voltage of the second signal input terminal VP2 of the comparison unit is the value of the voltage of the third capacitor C3 after being divided by the eleventh resistor R11 and the twelfth resistor R12.

[0039] With reference to the foregoing Figure 1As shown, one end of the fourth resistor R4 is connected with the power supply UBR, the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5 and the second reference signal input end VM2 of the comparison unit; the other end of the fifth resistor R5 is grounded; the voltage of the power supply UBR is input to the second reference signal input end VM2 of the comparison unit through the fourth resistor R4 and the fifth resistor R5. The voltage of the second reference signal input end VM2 of the comparison unit can be adjusted by the fourth resistor R4 and the fifth resistor R5, and the voltage of the second reference signal input end VM2 R4 is the resistance value of the fourth resistor R4, R5 is the resistance value of the fifth resistor R5, V DD5 is the voltage of the power supply UBR.

[0040] The comparison unit outputs corresponding signal from the second signal output end VS2 of the comparison unit to the passive wake-up signal output end after comparing the input signal of the second signal input end VP2 with the reference signal of the second reference signal input end VM2. In this embodiment, the first controller of the automobile can input signal to the passive wake-up signal input end of the passive wake-up module, and the signal output by the passive wake-up signal output end of the passive wake-up module is used to wake up other controllers of the automobile.

[0041] In this embodiment, when the control end of the second switch M2 is a high level signal, the second switch M2 is closed, and the first connection end and the second connection end of the second switch M2 are conducted. When the control end of the third switch M3 is a high level signal, the third switch M3 is closed, and the first connection end and the second connection end of the third switch M3 are conducted. Exemplarily, the second switch M2 and the third switch M3 are NMOS.

[0042] Reference Figure 1 As shown, when the first signal output end VS1 outputs a high level signal, the control end of the second switch M2 is a high level signal, at this time the second switch M2 is closed, the second connection end of the second switch M2 is grounded, the control end of the third switch M3 is a low level signal, and the third switch M3 is opened; at this time, the base voltage of the transistor Q1 is The emitter voltage of the transistor Q1 is the voltage V DD5 of the power supply VDD5, the transistor Q1 works in the saturation region, the emitter and the collector of the transistor Q1 are conducted, and the power supply VDD5 charges the third capacitor C3 through the transistor Q1 and the tenth resistor R10.

[0043] The charging time of the third capacitor C3 is t, wherein E is the limit voltage of the charging of the third capacitor C3, E = V DD5 -V CEsat , V CEsat is the saturation voltage of the collector and the emitter of the transistor Q1, V t is the charging voltage of the third capacitor C3 at a certain moment, R 10R10 is the resistance value of the tenth resistor, and C is the capacitance value of the third capacitor, C3.

[0044] Since the voltage at the second signal input terminal VP2 of the comparator is the same as the voltage V of the third capacitor C3... t The voltage at the second signal input terminal VP2 of the comparator unit, after being divided by the eleventh resistor R11 and the twelfth resistor R12, is V. VP2 , Among them, R 11 R is the resistance value of the eleventh resistor. 12 This is the resistance value of the twelfth resistor.

[0045] When the voltage V at the second signal input terminal VP2 VP2 Greater than the second reference signal input terminal V VM2 V VP2 >V VM2 , When the second signal output terminal VS2 outputs a high-level signal to the passive wake-up signal output terminal, the passive wake-up signal output terminal outputs a high-level signal, thus achieving the purpose of waking up other controllers with the input signal of the passive wake-up signal input terminal; when the voltage V of the second signal input terminal VP2... VP2 Less than the voltage V at the second reference signal input terminal VM2 V VP2 <V VM2 , When this happens, the second signal output terminal VS2 outputs a low-level signal to the passive wake-up signal output terminal. Let the switching level threshold for charging the third capacitor C3 be V. F , And V F It is also the toggle level threshold of VS2, the second signal output terminal of the comparison unit.

[0046] According to the formula for calculating the charging time t of the third capacitor C3 and V F The expression can be used to calculate the threshold V at which the third capacitor C3 reaches the switching level. F The required time t F According to the flip-level threshold V F From the expression, we can see that the flip level threshold V F The third capacitor C3 charges to the switching level threshold V, which is related to the resistance values ​​of the fourth resistor R4 and the fifth resistor R5. F The required time t F It is also related to the resistance values ​​of the fourth resistor R4 and the fifth resistor R5, so that by adjusting the resistance values ​​of the fourth resistor R4 and the fifth resistor R5, the flip-level threshold V of the second signal output terminal VS2 of the comparator unit can be adjusted. F Or, in other words, it can adjust the charging of the third capacitor C3 to reach the flip-level threshold V. Fthe time, and then the second signal input end VP2 of the comparison unit reaches the flip level threshold V F the time, to adjust the passive wake-up time.

[0047] With reference to the Figure 1 As shown in the figure, when the first signal output end VS1 of the comparison unit outputs a low-level signal, the control end of the second switch M2 is a low-level signal, the second switch M2 is open, the control end of the third switch M3 is a high-level signal, the third switch M3 is closed, the transistor Q1 works in the cutoff region, and the emitter and collector of the transistor Q1 are not conductive, that is, the third transistor Q3 is disconnected from the two sides of the circuit, the power supply VDD5 cannot charge the third capacitor C3 through the tenth resistor R10, and the voltage signal on the third capacitor C3 is quickly discharged to the ground through the thirteenth resistor R13, so the level of the third capacitor C3 cannot reach the flip level threshold V F Therefore, the voltage of the second signal input end VP2 of the comparison unit is less than the voltage of the second reference signal input end VM2, and the second signal output end VS2 of the comparison unit continuously outputs a low-level signal to the passive wake-up signal output end.

[0048] Therefore, by outputting a high-low level signal from the first signal output end VS1 of the comparison unit, the second signal output end VS2 of the comparison unit outputs a wake-up signal after adjusting the wake-up time to the passive wake-up signal output end, achieving the purpose of adjusting the passive wake-up time.

[0049] The wake-up circuit of the embodiment can also include an active wake-up module to realize the function of the active wake-up controller. Figure 2 The active wake-up module of the wake-up circuit provided by an embodiment of the present application is shown in the figure. As shown in the figure, the active wake-up module can include a first switch M1 and a first resistor R1. Figure 2

[0050] The control end of the first switch M1 is connected with the active wake-up signal input end, the first connection end of the first switch M1 is connected with the power supply UBR, the second connection end of the first switch M1 is connected with one end of the first resistor R1 and the active wake-up signal output end, and the other end of the first resistor R1 is connected with the signal back-end.

[0051] ​For example, when the control end of the first switch M1 is a high-level signal, the first switch M1 is closed, and the first connection end and the second connection end of the first switch M1 are conducted. When the active wake-up signal input end inputs a high-level signal, the control end of the first switch M1 is a high-level signal, the first switch M1 is closed, at this time, the signal back-end outputs a high-level signal, and the active wake-up signal output end outputs a high-level signal; when the active wake-up signal input end inputs a low-level signal, the control end of the first switch M1 is a low-level signal, the first switch M1 is disconnected, at this time, the signal back-end outputs a low-level signal, and the active wake-up signal output end outputs a low-level signal.

[0052] The output signal of the active wake-up signal output end is used to wake up the controller, such as the controller in the automobile. By detecting the output signal of the signal back-end, the output signal of the active wake-up signal output end can be monitored, so that the abnormality of the output signal of the active wake-up signal output end can be found in time and adjusted in time, which is beneficial to ensure the accuracy of the output signal of the active wake-up signal output end and improve the reliability and accuracy of the active wake-up function.

[0053] The active wake-up module can further include a first capacitor C1, one end of the first capacitor C1 being connected to the other end of the first resistor R1 together with the signal back-end, and the other end of the first capacitor C1 being grounded. The first capacitor C1 is a filter capacitor, which is used to filter the signal output to the signal back-end.

[0054] With reference to Figure 2 , the active wake-up module can further include a second capacitor C2 and an electrostatic protection diode D1, one end of the second capacitor C2 and one end of the electrostatic protection diode D1 being connected to the second connection end of the first switch M1, and the other end of the second capacitor C2 and the other end of the electrostatic protection diode D1 being grounded. The capacitor C2 is a filter capacitor. The electrostatic protection diode D1 is used to protect the wake-up circuit from static electricity.

[0055] Figure 3 A schematic diagram of a wake-up circuit provided by an embodiment of the present application is shown in Figure 3 . As shown in Figure 1 and Figure 2 , the first port can serve as the passive wake-up signal input end of the passive wake-up module and as the active wake-up signal output end of the active wake-up module, that is, the passive wake-up module and the active wake-up module can share the first port, which is helpful to simplify the wake-up circuit and reduce the area of the wake-up circuit.

[0056] As shown in Figure 3 , the passive wake-up module and the active wake-up module can also share the second capacitor C2 and the electrostatic protection diode D1, which is helpful to further simplify the wake-up circuit.

[0057] The embodiment also provides an automobile. The automobile comprises a plurality of controllers and the wake-up circuit. The wake-up circuit comprises a passive wake-up module, a controller of the automobile inputs a signal into a passive wake-up signal input end of the passive wake-up module, and a signal output by a passive wake-up signal output end of the passive wake-up module wakes up other controllers in the automobile.

[0058] The wake-up circuit can also comprise an active wake-up module, and an output signal of an active wake-up signal output end of the active wake-up module is used for actively waking up the controllers in the automobile.

[0059] The above description is only a description of the preferred embodiment of the present application, and is not any limitation on the scope of the present application. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application, which does not depart from the technical solutions of the present application, belongs to the protection scope of the technical solutions of the present application.

Claims

1. A wake-up circuit, characterized by, The passive wake-up module comprises a comparison unit, a second switch, a triode, a tenth resistor, a third capacitor, a fourth resistor, a fifth resistor, an eighth resistor and a ninth resistor. The first signal input end of the comparison unit is connected with the passive wake-up signal input end, and the comparison unit outputs corresponding signals from the first signal output end after comparing the input signals of the first signal input end and the reference signals of the first reference signal input end of the comparison unit. The control end of the second switch is connected with the first signal output end of the comparison unit, the first connection end of the second switch is grounded, and the second connection end of the second switch is connected with the base of the triode, one end of the tenth resistor, the first connection end of the third capacitor and the second signal input end of the comparison unit. The emitter of the triode is connected with the same power supply as the emitter of the triode, and the other end of the eighth resistor is connected with one end of the ninth resistor and the base of the triode. One end of the fourth resistor is connected with a power supply, the other end of the fourth resistor is connected with one end of the fifth resistor and the second reference signal input end of the comparison unit, and the other end of the fifth resistor is grounded. The comparison unit outputs corresponding signals from the second signal output end to the passive wake-up signal output end after comparing the input signals of the second signal input end and the reference signals of the second reference signal input end. The fourth resistor and the fifth resistor are adjusted to adjust the wake-up time of the input signals of the passive wake-up signal input end.

2. The wake-up circuit of claim 1, wherein, The control end of the second switch is a high-level signal, and the first connection end and the second connection end of the second switch are turned on.

3. The wake-up circuit of claim 1, wherein, The passive wake-up module further comprises an eleventh resistor and a twelfth resistor. One end of the eleventh resistor is connected with the first connection end of the third capacitor, the other end of the eleventh resistor is connected with one end of the twelfth resistor and the second signal input end of the comparison unit, and the other end of the twelfth resistor is grounded.

4. The wake-up circuit of claim 1, wherein, The passive wake-up module further comprises a sixth resistor and a seventh resistor, one end of the seventh resistor is connected with the passive wake-up signal input end, the other end of the seventh resistor is connected with one end of the sixth resistor and the first signal input end of the comparison unit, and the other end of the sixth resistor is grounded.

5. The wake-up circuit of claim 1, wherein, The passive wake-up module further comprises a second resistor and a third resistor, one end of the second resistor is connected with a power supply, the other end of the second resistor is connected with one end of the third resistor and the first reference signal input end of the comparison unit, and the other end of the third resistor is grounded.

6. The wake-up circuit of claim 1, wherein, The wake-up circuit further comprises an active wake-up module, the active wake-up module comprises a first switch and a first resistor, the control end of the first switch is connected with an active wake-up signal input end, the first connection end of the first switch is connected with a power supply, the second connection end of the first switch is connected with one end of the first resistor and an active wake-up signal output end, and the other end of the first resistor is connected with a signal back-end, and the output signal of the active wake-up signal output end can be monitored by detecting the output signal of the signal back-end.

7. The wake-up circuit of claim 6, wherein, The active wake-up module further comprises a first capacitor, one end of the first capacitor is connected with the other end of the first resistor together with the signal back-end, and the other end of the first capacitor is grounded.

8. The wake-up circuit of claim 6, wherein, The wake-up circuit comprises a first port, the passive wake-up module and the active wake-up module share the first port, and the first port serves as the passive wake-up signal input end and the active wake-up signal output end.

9. The wake-up circuit of claim 8, wherein, The wake-up circuit comprises a second capacitor and an electrostatic protection diode, one end of the second capacitor and one end of the electrostatic protection diode are connected with the first port, and the other end of the second capacitor and the other end of the electrostatic protection diode are grounded.

10. The wake-up circuit of claim 1, wherein, The comparison unit comprises a double-channel voltage comparator.

11. An automobile characterized by comprising: The wake-up circuit comprises a plurality of controllers and a passive wake-up module, one of the controllers inputs a signal into the passive wake-up signal input end of the passive wake-up module, and the signal output by the passive wake-up signal output end of the passive wake-up module wakes up other controllers in the automobile.

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