A wake-up circuit

Abstract

This invention discloses a wake-up circuit. The wake-up circuit includes: a first switch module, whose control terminal receives a high-level signal or a low-level signal, and whose first terminal is electrically connected to an external power supply; a first resistor-capacitor module, whose first terminal is electrically connected to the second terminal of the first switch module; a second switch module, whose control terminal is electrically connected to the second terminal of the first resistor-capacitor module, whose first terminal is electrically connected to the external power supply, and whose second terminal is grounded; a third switch module, whose control terminal is electrically connected to the first terminal of the second switch module, and whose first terminal is electrically connected to the external power supply; and a second resistor-capacitor module, whose first terminal is electrically connected to the second terminal of the third switch module. The wake-up circuit provided by this invention can promptly cut off the wake-up signal and prevent false wake-ups, thus improving circuit reliability.

Description

Technical Field

[0001] The embodiments of the present invention relate to circuit design technology, and more particularly to a wake-up circuit. Background Technology

[0002] Wake-up circuits, such as those for vehicle control devices, require waking up the device when it transitions from a low-power sleep state to normal operation. Currently, existing wake-up circuits suffer from issues like delayed signal cutoff and false wake-ups, impacting circuit reliability. Summary of the Invention

[0003] This invention provides a wake-up circuit that promptly cuts off the wake-up signal, prevents false wake-ups, and improves circuit reliability.

[0004] This invention provides a wake-up circuit, comprising: The first switch module has a control terminal that receives a high-level signal or a low-level signal, and its first terminal is electrically connected to an external power supply. The first resistor-capacitor module, wherein the first terminal of the first resistor-capacitor module is electrically connected to the second terminal of the first switch module; The second switch module has its control terminal electrically connected to the second terminal of the first resistor-capacitor module, its first terminal electrically connected to the external power supply, and its second terminal grounded. The conduction time of the second switch module is related to the resistance and capacitance of the first resistor-capacitor module. The third switch module has its control terminal electrically connected to the first terminal of the second switch module, and the first terminal of the third switch module is electrically connected to the external power supply. The second resistor-capacitor module has its first terminal electrically connected to the second terminal of the third switch module, and its second terminal electrically connected to the target device. The signal transmitted to the target device through the second terminal of the second resistor-capacitor module is used to wake up the target device. The time for the capacitor in the second resistor-capacitor module to charge to the threshold voltage is the time to prevent accidental switching in the first switch module. The threshold voltage is the threshold voltage for waking up the target device.

[0005] Optionally, the first switch module includes a first switch submodule and a second switch submodule. The first terminal of the first switch submodule is grounded, the second terminal of the first switch submodule is electrically connected to the control terminal of the second switch submodule through a resistor, the first terminal of the second switch submodule is electrically connected to the external power supply, and the second terminal of the second switch submodule is electrically connected to the first terminal of the first resistor-capacitor module.

[0006] Optionally, the first resistor-capacitor module includes a first resistor sub-module, a second resistor sub-module, and a first capacitor sub-module. The first terminal of the first resistor sub-module is electrically connected to the second terminal of the first switch module. The second terminal of the first resistor sub-module is electrically connected to the first terminal of the second resistor sub-module through the first capacitor. The second terminal of the second resistor sub-module is grounded. The first terminal of the second resistor sub-module is electrically connected to the control terminal of the second switch module.

[0007] Optionally, the conduction time t of the second switching module is t = (R1 + R2) × C1, where R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, and C1 is the capacitance of the first capacitor.

[0008] Optionally, the first resistor-capacitor module further includes a third resistor sub-module, which is connected in parallel with the first capacitor sub-module.

[0009] Optionally, the second switch module includes a third switch submodule. The control terminal of the third switch submodule is electrically connected to the second terminal of the first resistor-capacitor module. The first terminal of the third switch submodule is electrically connected to an external power supply through a resistor, and the second terminal of the third switch submodule is grounded.

[0010] Optionally, the third switch module includes a fourth switch submodule, the control terminal of the fourth switch is electrically connected to the first terminal of the second switch module, the first terminal of the fourth switch submodule is electrically connected to an external power supply, and the second terminal of the fourth switch submodule is electrically connected to the first terminal of the second resistor-capacitor module.

[0011] Optionally, the second resistor-capacitor module includes a fourth resistor submodule and a second capacitor submodule. The first terminal of the fourth resistor submodule is electrically connected to the second terminal of the third switch module, the second terminal of the fourth resistor submodule is grounded through the second capacitor submodule, and the second terminal of the fourth resistor submodule is electrically connected to the target device.

[0012] Optionally, the time it takes for the second capacitor to charge to the threshold voltage is the time required to prevent accidental switching in the first switching module.

[0013] Optionally, the wake-up circuit is located in the vehicle.

[0014] The wake-up circuit provided in this embodiment of the invention includes: a first switch module, wherein a high-level signal or a low-level signal is input to the control terminal of the first switch module, and a first terminal of the first switch module is electrically connected to an external power supply; a first resistor-capacitor module, wherein a first terminal of the first resistor-capacitor module is electrically connected to a second terminal of the first switch module; a second switch module, wherein a control terminal of the second switch module is electrically connected to a second terminal of the first resistor-capacitor module, a first terminal of the second switch module is electrically connected to an external power supply, and a second terminal of the second switch module is grounded, and the conduction time of the second switch module is related to the resistance and capacitance of the first resistor-capacitor module; a third switch module, wherein a control terminal of the third switch module is electrically connected to a first terminal of the second switch module, and a first terminal of the third switch module is electrically connected to an external power supply; a second resistor-capacitor module, wherein a first terminal of the second resistor-capacitor module is electrically connected to a second terminal of the third switch module, and a second terminal of the second resistor-capacitor module is electrically connected to a target device, so as to wake up the target device by transmitting a signal to the target device through the second terminal of the second resistor-capacitor module; the time for the capacitor in the second resistor-capacitor module to charge to a threshold voltage is the time to prevent accidental switching in the first switch module, and the threshold voltage is the threshold voltage for waking up the target device. The wake-up circuit provided in this embodiment of the invention, during the charging process of the capacitor in the first RC module, as the capacitor continuously charges, the voltage at the second terminal of the first RC module, i.e., the control terminal of the second switch module, continuously decreases. When this voltage gradually decreases to less than the conduction voltage of the second switch module, the second switch module is disconnected. At this time, the third switch module is disconnected, and the voltage at the second terminal of the second RC module is lower than the voltage required to wake up the target device. This ensures that the wake-up signal is promptly cut off when the first switch module is continuously conducting, and is not affected by the short-circuit failure of the switch in the first switch module. Furthermore, the time for the capacitor in the second RC module to charge to the threshold voltage is the time to prevent accidental switching in the first switch module. This ensures that when the switch in the first switch module is accidentally touched, the capacitor voltage has not reached the threshold voltage, and the target device is not woken up, thereby preventing the target device from being woken up due to accidental switching and improving circuit reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a wake-up circuit provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a terminal provided in an embodiment of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0017] Figure 1This is a schematic diagram of a wake-up circuit provided in an embodiment of the present invention. (Reference) Figure 1 The wake-up circuit includes: a first switch module 11, a second switch module 12, a third switch module 13, a first resistor-capacitor module 21, and a second resistor-capacitor module 22; wherein, the control terminal of the first switch module 11 receives a high-level signal or a low-level signal, and the first terminal of the first switch module 11 is electrically connected to the external power supply VCC; the first terminal of the first resistor-capacitor module 21 is electrically connected to the second terminal of the first switch module 11; the control terminal of the second switch module 12 is electrically connected to the second terminal of the first resistor-capacitor module 21, the first terminal of the second switch module 12 is electrically connected to the external power supply, and the second terminal of the second switch module 12 is grounded; when the second switch module 12 is turned on... The first resistor-capacitor module 21 is related to the resistor and capacitor; the control terminal of the third switch module 13 is electrically connected to the first terminal of the second switch module 12, and the first terminal of the third switch module 13 is electrically connected to the external power supply VCC; the first terminal of the second resistor-capacitor module 22 is electrically connected to the second terminal of the third switch module 13, and the second terminal of the second resistor-capacitor module 22 is electrically connected to the target device, so as to transmit a signal to the target device through the second terminal of the second resistor-capacitor module 22 to wake up the target device; the time for the capacitor in the second resistor-capacitor module 22 to charge to the threshold voltage is the time to prevent the switch in the first switch module 11 from being accidentally touched, and the threshold voltage is the threshold voltage for waking up the target device.

[0018] In one embodiment, the target device is a power management chip, and the wake-up circuit is the wake-up circuit of the power management chip. Each switch module and each resistor-capacitor module are used to provide a wake-up signal to the power management chip and prevent the power management chip from being woken up due to accidental switch contact. The first resistor-capacitor module 21 and the second resistor-capacitor module 22 both include resistors and capacitors. Each switch module includes at least one switch. The control terminal of the third switch module 13 is electrically connected to the external power supply VCC through a resistor. The voltage at the second terminal of the first switch module 11 and the on / off state of the first switch module 11 are related to the control terminal and the voltage at the first terminal of the first switch module 11. The on / off state of the third switch module 13 is the same as that of the second switch module 12. For example, when the voltage at the control terminal of the first switch module 11 is lower than the voltage at the first terminal of the first switch module 11, the first switch module 11 is turned on. At this time, the voltage at the second terminal of the first switch module 11 can be regarded as the voltage at the first terminal of the first switch module 11, i.e., the voltage of the external power supply VCC. When the voltage at the control terminal of the second switch module 12 is higher than the voltage required for the second switch module 12 to turn on, the second switch module 12 turns on. At this time, when the voltage at the control terminal of the third switch module 13 is lower than the voltage at the first terminal of the third switch module 13, the third switch module 13 turns on. That is, when the second switch module 12 turns on, the third switch module 13 also turns on. Specifically, when the first switch module 11 is normally turned on, it transmits the voltage of the external power supply VCC to the first resistor-capacitor module 21. At this time, the capacitor in the first resistor-capacitor module 21 begins to charge. The voltage at the second terminal of the first resistor-capacitor module 21, i.e., the control terminal of the second switch module 12, is higher than the voltage required for the second switch module 12 to turn on, so the second switch module 12 turns on. The voltage at the first terminal of the second switch module 12, i.e., the control terminal of the third switch module 13, is lower than the voltage at the first terminal of the third switch module 13, i.e., the voltage of the external power supply VCC, so the third switch module 13 turns on. The third switch module 13 transmits the voltage of the external power supply VCC to the second resistor-capacitor module 22. At this time, the voltage of the level signal at the second terminal of the second resistor-capacitor module 22 reaches the voltage threshold for waking up the power management chip. This level signal is the wake-up signal, and the power management chip is woken up.

[0019] Furthermore, during the capacitor charging process of the first RC module 21, as the capacitor continuously charges, the voltage at the second terminal of the first RC module 21, i.e., the control terminal of the second switch module 12, continuously decreases. When this voltage gradually decreases to less than the voltage required for the second switch module 12 to conduct, the second switch module 12 is disconnected. At this time, the voltage at the first terminal of the second switch module 12, i.e., the control terminal of the third switch module 13, is lower than the voltage at the first terminal of the third switch module 13, and the third switch module 13 is disconnected. When the third switch module 13 is disconnected, the voltage at the second terminal of the second RC module 22 is lower than the voltage required to wake up the target device, so as to cut off the wake-up signal when the first switch module 11 is continuously conducting, and not be affected by the short-circuit failure of the switch in the first switch module 11. Furthermore, since the time t1 for the switch to turn on from off to on when the switch is accidentally touched is less than the time t2 for the switch to turn on from off to on when the switch is normally on, the time for the capacitor in the second resistor-capacitor module to charge to the threshold voltage is set to be greater than t1 and less than t2. This ensures that when the switch in the first switch module 11 is accidentally touched, the voltage of the capacitor does not reach the threshold voltage, and the target device is not woken up, thereby preventing the target device from being woken up due to accidental switch touch.

[0020] The wake-up circuit provided in this embodiment includes: a first switch module, the control terminal of which receives a high-level signal or a low-level signal, and the first terminal of which is electrically connected to an external power supply; a first resistor-capacitor module, the first terminal of which is electrically connected to the second terminal of the first switch module; a second switch module, the control terminal of which is electrically connected to the second terminal of the first resistor-capacitor module, the first terminal of which is electrically connected to an external power supply, and the second terminal of which is grounded, the conduction time of the second switch module being related to the resistance and capacitance of the first resistor-capacitor module; a third switch module, the control terminal of which is electrically connected to the first terminal of the second switch module, and the first terminal of which is electrically connected to an external power supply; a second resistor-capacitor module, the first terminal of which is electrically connected to the second terminal of the third switch module, and the second terminal of which is electrically connected to a target device, so as to wake up the target device by transmitting a signal to the target device through the second terminal of the second resistor-capacitor module; the time for the capacitor in the second resistor-capacitor module to charge to a threshold voltage is the time to prevent accidental switching in the first switch module, and the threshold voltage is the threshold voltage for waking up the target device. The wake-up circuit provided in this embodiment, during the charging process of the capacitor in the first RC module, as the capacitor continuously charges, the voltage at the second terminal of the first RC module, i.e., the control terminal of the second switch module, continuously decreases. When this voltage gradually decreases to less than the conduction voltage of the second switch module, the second switch module is turned off. At this time, the third switch module is turned off, and the voltage at the second terminal of the second RC module is lower than the voltage required to wake up the target device. This ensures that the wake-up signal is promptly cut off when the first switch module is continuously conducting, and is not affected by the short-circuit failure of the switch in the first switch module. Furthermore, the time for the capacitor in the second RC module to charge to the threshold voltage is the time to prevent accidental switching in the first switch module. This ensures that when the switch in the first switch module is accidentally touched, the capacitor voltage has not reached the threshold voltage, and the target device is not woken up, thereby preventing the target device from being woken up due to accidental switching and improving circuit reliability.

[0021] refer to Figure 1 Optionally, the first switch module 11 includes a first switch submodule 111 and a second switch submodule 112. The first terminal of the first switch submodule 111 is grounded, and the second terminal of the first switch submodule 111 is electrically connected to the control terminal of the second switch submodule 112 through a resistor. The first terminal of the second switch submodule 112 is electrically connected to the external power supply VCC, and the second terminal of the second switch submodule 112 is electrically connected to the first terminal of the first resistor-capacitor module 21.

[0022] The first switch submodule 111 includes a first switch K1, and the second switch submodule 112 includes a first switch transistor M1. When the first switch K1 is closed, the first switch transistor M1 is turned on, thereby transmitting the voltage of the external power supply VCC to the first resistor-capacitor module 21 through the first switch transistor M1. The control terminal of the first switch transistor M1 is electrically connected to the external power supply VCC through a resistor. In one embodiment, the first switch transistor M1 is turned on when the voltage at the control terminal of the first switch transistor M1 is less than the voltage at the first terminal of the first switch transistor M1, i.e., the voltage of the external power supply VCC. When the first switch K1 is normally closed, the voltage at the control terminal of the first switch transistor M1 is less than the voltage at the first terminal of the first switch transistor M1, i.e., the voltage of the external power supply VCC. At this time, the first switch transistor M1 is turned on, thereby transmitting the voltage of the external power supply VCC to the first resistor-capacitor module 21 through the first switch transistor M1.

[0023] refer to Figure 1 Optionally, the first resistor-capacitor module 21 includes a first resistor submodule 211, a second resistor submodule 212, and a first capacitor submodule 201. The first end of the first resistor submodule 211 is electrically connected to the second end of the first switch module 11. The second end of the first resistor submodule 211 is electrically connected to the first end of the second resistor submodule 212 through the first capacitor submodule 201. The second end of the second resistor submodule 212 is grounded. The first end of the second resistor submodule 212 is electrically connected to the control end of the second switch module 12.

[0024] Specifically, each resistor submodule includes at least one resistor, and each capacitor submodule includes at least one capacitor. In one embodiment, the first resistor submodule 211 includes a first resistor R1, the second resistor submodule 212 includes a second resistor R2, and the first capacitor submodule 201 includes a first capacitor C1. The first resistor R1 is electrically connected to the second resistor R2 through the first capacitor C1. When the first switch module 11 is turned on, the voltage of the external power supply VCC is transmitted to the first capacitor C1 through the first resistor R1 to charge the first capacitor C1. When the voltage of the external power supply VCC is transmitted to the first resistor-capacitor module 21, the voltage at the second terminal of the first resistor-capacitor module 21, i.e., the voltage at the control terminal of the second switch module 12, is higher than the voltage required for the second switch module 12 to turn on, thereby controlling the second switch module 12.

[0025] Optionally, the conduction time t of the second switch module 12 is t = (R01 + R02) × C01, where R01 is the resistance of the first resistor submodule 211, R02 is the resistance of the second resistor submodule 212, and C01 is the capacitance of the first capacitor submodule 213.

[0026] The conduction time of the second switch module 12 is the time it takes for the voltage at the second terminal of the first resistor-capacitor module 21 to be lower than the voltage required for the second switch module 12 to conduct. As the first capacitor continues to charge, the voltage at the second terminal of the first resistor-capacitor module 21 gradually decreases until it decreases below the voltage required for the second switch module 12 to conduct, at which point the second switch module 12 is turned off to cut off the wake-up signal.

[0027] refer to Figure 1 Optionally, the first resistor-capacitor module 21 may also include a third resistor sub-module 213, which is connected in parallel with the first capacitor sub-module 201.

[0028] Specifically, the resistor submodule includes at least one resistor. In one embodiment, the third resistor submodule 213 includes a third resistor R3. When the voltage of the external power supply VCC is transmitted to the first RC module 21, it is transmitted sequentially through the first resistor submodule 211 and the third resistor submodule 213 to the second terminal of the first RC module 21, i.e., the control terminal of the second switch module 12, so as to control the second switch module 12 to be turned on.

[0029] refer to Figure 1 Optionally, the second switch module 12 includes a third switch submodule 123. The control terminal of the third switch submodule 123 is electrically connected to the second terminal of the first resistor-capacitor module 21. The first terminal of the third switch submodule 123 is electrically connected to the external power supply VCC through a resistor. The second terminal of the third switch submodule 123 is grounded.

[0030] The third switch submodule 123 includes at least one switch transistor. In one embodiment, the third switch submodule 123 includes a second switch transistor M2, and the conduction time of the second switch module 12 is the conduction time of the second switch transistor M2, which is also the conduction time of the third switch module 13.

[0031] refer to Figure 1 Optionally, the third switch module 13 includes a fourth switch submodule 134. The control terminal of the fourth switch submodule 134 is electrically connected to the first terminal of the second switch module 12. The first terminal of the fourth switch submodule 134 is electrically connected to the external power supply VCC. The second terminal of the fourth switch submodule 134 is electrically connected to the first terminal of the second resistor-capacitor module 22.

[0032] In this embodiment, the control terminal of the fourth switch submodule 134 is electrically connected to one end of the third switch submodule 123 via a resistor, and the first end of the fourth switch submodule 134 is electrically connected to the external power supply VCC via another resistor. In one embodiment, the fourth switch submodule 134 includes at least one switching transistor. In another embodiment, the fourth switch submodule 134 includes a third switching transistor M3, which is turned on when the second switch module 12 is turned on, and the on-time of the third switching transistor M3 is the same as the on-time of the second switch module 12. Furthermore, each switching transistor can be a MOSFET, a transistor, or other types of transistors, and is not limited thereto.

[0033] refer to Figure 1 Optionally, the second resistor-capacitor module 22 includes a fourth resistor submodule 224 and a second capacitor submodule 222. The first end of the fourth resistor submodule 224 is electrically connected to the second end of the third switch module 13. The second end of the fourth resistor submodule 224 is grounded through the second capacitor submodule. The second end of the fourth resistor submodule 224 is electrically connected to the target device.

[0034] Specifically, when the third switch module 13 is turned on, the voltage of the external power supply VCC is transmitted to the second resistor-capacitor module 22 to charge the second capacitor sub-module. When the voltage charged by the second capacitor sub-module reaches the voltage required to wake up the target device, the target device is woken up.

[0035] Furthermore, the fourth resistor submodule 224 includes at least one resistor, and the second capacitor submodule 222 includes at least one capacitor. In one embodiment, the fourth resistor submodule 224 includes a fourth resistor R4, and the second capacitor submodule 222 includes a second capacitor C2.

[0036] Optionally, the time for the second capacitor submodule 222 to charge to the threshold voltage is the time to prevent accidental switching in the first switch module 11.

[0037] Specifically, to prevent accidental switch activation in the first switch module 11, i.e. to prevent the target device from being woken up when the switch is accidentally activated, the charging time of the second capacitor submodule 222 to the threshold voltage is longer than the time it takes for the switch to go from open to closed when the switch is accidentally activated. In addition, the charging time of the second capacitor submodule 222 to the threshold voltage is shorter than the time it takes for the switch to go from open to closed when the switch is normally closed, so as to ensure that the target device can be woken up when it needs to be woken up, and will not be woken up when it does not need to be woken up, such as when the switch is accidentally activated.

[0038] Optionally, the wake-up circuit is located in the vehicle.

[0039] Specifically, wake-up circuits are used in vehicles, such as in the vehicle's power management chip. They provide a wake-up signal to the vehicle's power management chip and ensure that the wake-up signal is cut off in a timely manner to prevent accidental activation of the switch in the wake-up circuit, which could cause the power management chip to be woken up when it is not needed.

[0040] It should be noted that the values ​​of each parameter in this embodiment can be determined according to the specific requirements of the circuit design, and are not limited here.

[0041] The wake-up circuit provided in this embodiment includes: a first switch module, the control terminal of which receives a high-level signal or a low-level signal, and the first terminal of which is electrically connected to an external power supply; a first resistor-capacitor module, the first terminal of which is electrically connected to the second terminal of the first switch module; a second switch module, the control terminal of which is electrically connected to the second terminal of the first resistor-capacitor module, the first terminal of which is electrically connected to an external power supply, the second terminal of which is grounded, and the conduction time of the second switch module being related to the resistance and capacitance of the first resistor-capacitor module; a third switch module, the control terminal of which is electrically connected to the first terminal of the second switch module, and the first terminal of which is electrically connected to an external power supply; and a second resistor-capacitor module, the first terminal of which is grounded. The second terminal of the third switch module is electrically connected to the second terminal of the second resistor-capacitor module, and the second terminal of the second resistor-capacitor module is electrically connected to the target device so as to transmit a signal to the target device through the second terminal of the second resistor-capacitor module to wake up the target device; the second resistor-capacitor module includes a fourth resistor submodule and a second capacitor submodule, and the time for the second capacitor submodule to charge to the threshold voltage is the time to prevent the switch in the first switch module from being accidentally touched, and the threshold voltage is the threshold voltage for waking up the target device; the first switch module includes a first switch submodule and a second switch submodule, the first terminal of the first switch submodule is grounded, the second terminal of the first switch submodule is electrically connected to the control terminal of the second switch submodule through a resistor, the first terminal of the second switch submodule is electrically connected to an external power supply, and the second terminal of the second switch submodule is electrically connected to the first terminal of the first resistor-capacitor module. The wake-up circuit provided in this embodiment, during the charging process of the first capacitor, as the first capacitor continuously charges, the voltage at the second terminal of the first RC module, i.e., the control terminal of the second switch module, continuously decreases. When this voltage gradually decreases to less than the voltage at which the second switch module is turned on, the second switch module is turned off. At this time, the third switch module is turned off, and the voltage at the second terminal of the second RC module is lower than the voltage required to wake up the target device. This achieves the goal of cutting off the wake-up signal when the first switch submodule is continuously turned on, preventing it from being affected by the short-circuit failure of the first switch submodule. Furthermore, the time for the second capacitor submodule to charge to the threshold voltage is the time to prevent the first switch submodule from being accidentally touched. This ensures that when the first switch submodule is accidentally touched, the voltage of the second capacitor module has not reached the threshold voltage, and the target device is not woken up. This prevents the target device from being woken up due to the first switch submodule being accidentally touched, thereby improving the reliability of the circuit.

[0042] In one implementation, the on / off state of the first switch in the first switch module can be controlled by a controller located at the terminal. Figure 2 This is a schematic diagram of the structure of a terminal provided in an embodiment of the present invention. Figure 2 A block diagram of an exemplary device 412 suitable for implementing embodiments of the present invention is shown. Figure 2 The device 412 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0043] like Figure 2 As shown, device 412 is represented as a general-purpose device. Components of device 412 may include, but are not limited to: one or more processors 416, storage device 428, and bus 418 connecting different system components (including storage device 428 and processor 416).

[0044] Bus 418 represents one or more of several bus architectures, including a memory device bus or memory device control module, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Subversive Alliance (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0045] Device 412 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by device 412, including volatile and non-volatile media, removable and non-removable media.

[0046] Storage device 428 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 430 and / or cache memory 432. Device 412 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 434 may be used to read and write non-removable, non-volatile magnetic media (… Figure 2 Not shown; usually referred to as a "hard drive"). Although Figure 2As not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disc drive for reading and writing to a removable non-volatile optical disc, such as a Compact Disc Read-Only Memory (CD-ROM), a Digital Video Disc Read-Only Memory (DVD-ROM), or other optical media. In these cases, each drive may be connected to bus 418 via one or more data media interfaces. Storage device 428 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0047] A program / utility 440 having a set (at least one) of program modules 442 may be stored in, for example, a storage device 428. Such program modules 442 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 442 typically perform the functions and / or methods described in the embodiments of the present invention.

[0048] Device 412 can also communicate with one or more external devices 414 (e.g., keyboard, pointing terminal, display 424, etc.), and with one or more terminals that enable a user to interact with device 412, and / or with any terminal that enables device 412 to communicate with one or more other computing terminals (e.g., network card, modem, etc.). This communication can be performed via input / output (I / O) interface 422. Furthermore, device 412 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 420. Figure 2 As shown, network adapter 420 communicates with other modules of device 412 via bus 418. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with device 412, including but not limited to: microcode, terminal drivers, redundant processors, external disk drive arrays, Redundant Arrays of Independent Disks (RAID) systems, tape drives, and data backup storage systems.

[0049] The processor 416 (which can be regarded as the controller described above) executes various functional applications and data processing by running the program stored in the storage device 428, such as implementing the on / off control of the first switch in the first switch module of the wake-up circuit by the controller provided in the embodiment of the present invention.

[0050] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a controller, controls the on / off state of a first switch in a first switching module of a wake-up circuit.

[0051] The computer storage medium of this invention can be any combination of one or more computer-readable media. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0052] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0053] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0054] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0055] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, rearrangements, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A wake-up circuit, characterized in that, include: The first switch module has a control terminal that receives a high-level signal or a low-level signal, and its first terminal is electrically connected to an external power supply. The first resistor-capacitor module, wherein the first terminal of the first resistor-capacitor module is electrically connected to the second terminal of the first switch module; The second switch module has its control terminal electrically connected to the second terminal of the first resistor-capacitor module, its first terminal electrically connected to the external power supply, and its second terminal grounded. The conduction time of the second switch module is related to the resistance and capacitance of the first resistor-capacitor module. The third switch module has its control terminal electrically connected to the first terminal of the second switch module, and the first terminal of the third switch module is electrically connected to the external power supply. The second resistor-capacitor module has its first terminal electrically connected to the second terminal of the third switch module, and its second terminal electrically connected to the target device. The signal transmitted to the target device through the second terminal of the second resistor-capacitor module is used to wake up the target device. The time for the capacitor in the second resistor-capacitor module to charge to the threshold voltage is the time to prevent accidental switching in the first switch module. The threshold voltage is the threshold voltage for waking up the target device.

2. The wake-up circuit according to claim 1, characterized in that, The first switch module includes a first switch submodule and a second switch submodule. The first terminal of the first switch submodule is grounded, and the second terminal of the first switch submodule is electrically connected to the control terminal of the second switch submodule through a resistor. The first terminal of the second switch submodule is electrically connected to the external power supply, and the second terminal of the second switch submodule is electrically connected to the first terminal of the first resistor-capacitor module.

3. The wake-up circuit according to claim 1, characterized in that, The first resistor-capacitor module includes a first resistor sub-module, a second resistor sub-module, and a first capacitor sub-module. The first terminal of the first resistor sub-module is electrically connected to the second terminal of the first switch module. The second terminal of the first resistor sub-module is electrically connected to the first terminal of the second resistor sub-module through the first capacitor sub-module. The second terminal of the second resistor sub-module is grounded. The first terminal of the second resistor sub-module is electrically connected to the control terminal of the second switch module.

4. The wake-up circuit according to claim 3, characterized in that, The conduction time t of the second switching module is t = (R1 + R2) × C1, where R1 is the resistance of the first resistor submodule, R2 is the resistance of the second resistor submodule, and C1 is the capacitance of the first capacitor submodule.

5. The wake-up circuit according to claim 3, characterized in that, The first resistor-capacitor module further includes a third resistor sub-module, which is connected in parallel with the first capacitor sub-module.

6. The wake-up circuit according to claim 1, characterized in that, The second switch module includes a third switch submodule. The control terminal of the third switch submodule is electrically connected to the second terminal of the first resistor-capacitor module. The first terminal of the third switch submodule is electrically connected to an external power supply through a resistor, and the second terminal of the third switch submodule is grounded.

7. The wake-up circuit according to claim 1, characterized in that, The third switch module includes a fourth switch submodule. The control terminal of the fourth switch submodule is electrically connected to the first terminal of the second switch module. The first terminal of the fourth switch submodule is electrically connected to an external power supply. The second terminal of the fourth switch submodule is electrically connected to the first terminal of the second resistor-capacitor module.

8. The wake-up circuit according to claim 1, characterized in that, The second resistor-capacitor module includes a fourth resistor submodule and a second capacitor submodule. The first terminal of the fourth resistor submodule is electrically connected to the second terminal of the third switch module. The second terminal of the fourth resistor submodule is grounded through the second capacitor submodule. The second terminal of the fourth resistor submodule is electrically connected to the target device.

9. The wake-up circuit according to claim 8, characterized in that, The time it takes for the second capacitor to charge to the threshold voltage is the time required to prevent accidental switching in the first switching module.

10. The wake-up circuit according to claim 1, characterized in that, The wake-up circuit is located in the vehicle.

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