Controller switch wake-up circuit

Abstract

The utility model discloses a controller switch wake-up circuit, and belongs to the field of electronic circuits. Aiming at the problems of high power consumption and high cost of the existing switch wake-up circuit, the utility model provides a controller switch wake-up circuit which comprises a wake-up sub-circuit and an acquisition sub-circuit which are arranged in parallel, and one end of the wake-up sub-circuit and one end of the acquisition sub-circuit are respectively connected with a switch signal; the input end of the wake-up sub-circuit is a switching signal, and the output end is a wake-up source signal for waking up the single-chip microcomputer. The input end of the acquisition sub-circuit is a switching signal, the output end of the acquisition sub-circuit is an acquisition signal of the switching signal, and a wake-up source signal of the wake-up sub-circuit and the acquisition signal of the acquisition sub-circuit are respectively connected with the single chip microcomputer. Through the arrangement of the wake-up sub-circuit, on one hand, the power consumption of the system is obviously reduced, and on the other hand, the wake-up sub-circuit can connect a plurality of switch signals in parallel to serve as a wake-up source signal to be input to the singlechip for wake-up, so that the number of GPIO (General Purpose Input / Output) ports of the singlechip is reduced, the hardware cost is reduced, and the compatibility is improved.

Description

Technical Field

[0001] This utility model belongs to the field of electronic circuit technology, and more specifically, relates to a controller switch wake-up circuit. Background Technology

[0002] Today, with the rapid development of new energy vehicles and the increasing demands for driving comfort, various intelligent comfort and passenger convenience features are becoming more and more common, leading to a significant increase in the number of vehicle electronic controllers. Therefore, OEMs are placing increasingly stringent requirements on the static power consumption (current consumption after module sleep) of each electronic controller to ensure that the vehicle can remain stationary for longer periods without experiencing power depletion. Currently, driven by customer needs, the number of switch wake-up sources for controllers is increasing. The current mainstream approach is to directly acquire the switch signals to the microcontroller (MCU) for signal acquisition and wake-up determination. However, this increases the number of MCU ports and static power consumption, and the cost of MCU chips with more GPIO resources is also higher.

[0003] To address the aforementioned issues, corresponding improvements have been made. For example, Chinese patent application CN202322700095.5, published on July 12, 2024, discloses a circuit for reducing the sleep current of multiple wake-up sources. This circuit includes a control circuit and a switching circuit. The pull-up power supply and the first voltage terminal are connected in parallel and then connected to the SW_VCC terminal via a first diode. The MCU and the pull-up power supply are connected to the SW_VCC terminal via the switching circuit and the second diode, respectively. When the DCU is in working or standby mode, the MCU output is high, and the voltage at the SW_VCC terminal is the pull-up power supply BAT voltage. When entering sleep mode, the MCU first controls the output to low before entering sleep mode. The voltage at the SW_VCC terminal is VDD, which is the same as the MCU's supply voltage, and there is no voltage difference between it and the MCU's I / O, thus avoiding additional current consumption. The drawback of this patent is that after the MCU wakes up, it needs to re-control the switching circuit to switch back to BAT power supply, resulting in an increased wake-up response time.

[0004] For example, Chinese patent application CN202121478345.X, published on January 14, 2022, discloses a wake-up circuit and electronic device for a controller. The wake-up circuit includes: an input terminal electrically connected to one or more input ports; an output terminal electrically connected to the controller; a first resistor and a second resistor connected in series between the input terminal and the output terminal; and an energy storage device connected in parallel with the second resistor. When one or more of the input ports are electrically connected to an input voltage, the output terminal of the wake-up circuit outputs an electrical signal to the controller to wake it up. A drawback of this patent is that while a high-resistance resistor can reduce the quiescent current, it prolongs the charging time. Utility Model Content

[0005] 1. The problem to be solved

[0006] To address the issues of high power consumption and high cost in existing switch wake-up circuits, this invention provides a controller switch wake-up circuit. This invention significantly reduces system power consumption through the inclusion of a wake-up sub-circuit. Furthermore, the wake-up sub-circuit can connect several switch signals in parallel, providing a single wake-up source signal to the microcontroller, thus reducing the number of GPIO ports on the microcontroller, lowering hardware costs, and improving compatibility.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A controller switch wake-up circuit includes a wake-up sub-circuit and a data acquisition sub-circuit connected in parallel. One end of each of the wake-up sub-circuit and the data acquisition sub-circuit is connected to a switch signal. The input of the wake-up sub-circuit is the switch signal, and the output is the wake-up source signal for waking up a microcontroller. The input of the data acquisition sub-circuit is the switch signal, and the output is the data acquisition signal of the switch signal. Both the wake-up source signal of the wake-up sub-circuit and the data acquisition signal of the data acquisition sub-circuit are connected to a microcontroller.

[0010] Furthermore, the wake-up sub-circuit includes several switches, each switch is connected in series with a diode, and the several diodes are all connected in series with the same first resistor. The first resistor is connected to the wake-up source signal output terminal, and the wake-up sub-circuit is powered by a constantly lit power supply, which is connected in series with the first resistor through a second resistor.

[0011] Furthermore, the resistance of the second resistor is much greater than the resistance of the switch signal, and the unit of the first resistor is kiloohms; the resistance of the first resistor is greater than the resistance of the second resistor, and the unit of the second resistor is megaohms.

[0012] Furthermore, the acquisition sub-circuit includes a switch and a pull-up power supply. The pull-up power supply provides power through a third resistor, a fourth resistor, and a fifth resistor connected in series. The fifth resistor is connected in parallel with a filter capacitor. One end of the fourth resistor is connected in series with the fifth resistor, and the other end of the fourth resistor is connected in series with the TP193 test point and the acquisition signal output terminal. The acquisition signal is connected to the microcontroller. The switching signal generated by the switch enters the TP193 test point and the acquisition signal output terminal in sequence through the fourth resistor.

[0013] Furthermore, the acquisition sub-circuit also includes a port protection capacitor, through which the switch is grounded.

[0014] Furthermore, a reverse diode is provided between the acquisition sub-circuit switch and the fourth resistor, and the current of the reverse diode is directed from the acquisition sub-circuit to the wake-up sub-circuit.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] (1) By adding a separate wake-up sub-circuit, this utility model enables the microcontroller to be woken up only when the switch state changes, so that the microcontroller is in sleep mode most of the time, which significantly reduces the system power consumption. On the other hand, when faced with several switches, the wake-up sub-circuit can connect several switch signals in parallel and input them as a wake-up source signal to the microcontroller for wake-up, which can greatly reduce the number of microcontroller GPIO ports, thereby reducing hardware costs and improving circuit compatibility. The entire controller switch wake-up circuit ensures stable operation while reducing power consumption, and the wake-up and acquisition functions are physically isolated to reduce signal coupling interference and have strong stability.

[0018] (2) In this utility model, the wake-up sub-circuit is connected in series with a diode after each switch. The unidirectional conductivity of the diode effectively prevents current from flowing back from one switch branch to another, thus isolating each switch branch from each other. This avoids false detection caused by signal crosstalk and improves the accuracy of the wake-up signal. It also enables several switches to share one wake-up GPIO, thus optimizing GPIO resources. At the same time, the constant power supply ensures that the wake-up sub-circuit can always detect switch action. The microcontroller is normally in sleep mode and is only briefly woken up when the wake-up signal is triggered, thus balancing low power consumption and real-time response.

[0019] (3) The acquisition sub-circuit in this utility model uses series resistors to divide the voltage, adjusting the switch signal to the input voltage range of the microcontroller's GPIO, avoiding overvoltage damage and ensuring the safety of the entire circuit; at the same time, a low-pass filter is formed by the parallel connection of the fifth resistor and the filter capacitor to suppress noise, improve the purity of the acquired signal, and facilitate the accurate judgment and processing of the microcontroller; at the same time, the port protection capacitor is used for decoupling and filtering, further ensuring the processing accuracy of the switch signal and ensuring the accuracy of the acquired signal input to the microcontroller;

[0020] (4) By adding a reverse diode after the switch in the acquisition sub-circuit, this utility model avoids the current from the wake-up sub-circuit flowing into the acquisition sub-circuit when the system is in a sleep state, the pull-up power supply is in a closed state and the always-on power supply is in a always-on state, thus avoiding continuous current consumption and blocking the path of leakage current during sleep. This makes the entire circuit have ultra-low power consumption and significantly reduces costs. Furthermore, the unidirectional isolation of the reverse diode enhances the overall anti-interference and reliability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the circuit structure of this utility model. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0023] like Figure 1 As shown, a controller switch wake-up circuit includes a wake-up sub-circuit and a data acquisition sub-circuit connected in parallel. One end of each of the wake-up sub-circuit and the data acquisition sub-circuit is connected to a switch signal. The input of the wake-up sub-circuit is the switch signal, and the output is the wake-up source signal for waking up the microcontroller. The input of the data acquisition sub-circuit is the switch signal, and the output is the data acquisition signal of the switch signal. Both the wake-up source signal of the wake-up sub-circuit and the data acquisition signal of the data acquisition sub-circuit are connected to the microcontroller.

[0024] Specifically, in this embodiment, in addition to the acquisition sub-circuit, a wake-up sub-circuit is added. The wake-up sub-circuit is designed to wake the microcontroller only when the switch state changes, keeping the microcontroller in sleep mode most of the time and significantly reducing system power consumption. Furthermore, when multiple switches are involved, the output of the wake-up sub-circuit can be combined into a single GPIO pin; any switch action triggering an interrupt will wake the microcontroller, thereby significantly reducing the number of GPIO pins on the microcontroller, thus lowering hardware costs and improving circuit compatibility. The entire controller switch wake-up circuit ensures stable operation while reducing power consumption, and the wake-up and acquisition functions are physically isolated, reducing signal coupling interference and ensuring high stability.

[0025] like Figure 1As shown, in one specific embodiment, the wake-up sub-circuit includes several switches, each switch is connected in series with a diode, and the several diodes are all connected in series with the same first resistor R12. The first resistor R12 is connected to the wake-up source signal output terminal, and the wake-up sub-circuit is powered by a constantly lit power supply, which is connected in series with the first resistor R12 through a second resistor R11.

[0026] In this embodiment, the structure of the wake-up sub-circuit is described in detail: by connecting a diode in series after each switch, the unidirectional conductivity of the diode effectively prevents current from flowing back from one switch branch to another, thus isolating each switch branch from each other and avoiding false detections caused by signal crosstalk, thereby improving the accuracy of the wake-up signal; and the switch signals after all the series diodes are connected in parallel and used as a wake-up signal input to the microcontroller for acquisition and judgment, thereby optimizing GPIO resources.

[0027] When using the wake-up sub-circuit in this embodiment, the entire controller switch wake-up circuit operates as follows: When the microcontroller is in sleep mode, the power supply in the acquisition sub-circuit is off to reduce static power consumption. The constantly lit power supply KL30A_VCC12 in the wake-up sub-circuit is a pull-up resistor for the constant-power wake-up circuit. When any one of the switches SW1, SW2, SW3, etc., is active (i.e., when a switch signal is triggered, i.e., the wake-up source), the SW_WAKE level is pulled low. SW_WAKE_MCU is connected to the MCU port, thus waking up the microcontroller. After the microcontroller is woken up, the power supply in the acquisition sub-circuit is turned on to supply power. The acquisition sub-circuit acquires the input switch signals, and the acquired signals are sent to the microcontroller MCU to determine which specific switch is being used and control the corresponding switch's action. It is worth noting that in this embodiment, since the switch acquisition circuit is relatively existing technology and not a core inventive point of this application, the acquisition sub-circuit can be implemented using existing circuitry.

[0028] In one specific embodiment, the resistance value of the second resistor is much larger than the resistance value of the switch signal, and the unit of the first resistor is kiloohms; the resistance value of the first resistor is larger than the resistance value of the second resistor, and the unit of the second resistor is megaohms. Specifically, in this embodiment, the first resistor mainly functions as a current limiter, therefore a large-value resistor is used to provide current limiting protection for the entire circuit and avoid the risk of overcurrent damage; of course, the specific resistance value of the first resistor can be 1MΩ with an accuracy of 1%. The second resistor mainly functions as a voltage divider and dynamic response optimization. When the switch is open, the voltage at the wake-up signal output terminal is determined by the voltage division of the first and second resistors, and the large-value resistor ensures that the wake-up signal can rise quickly when the switch is closed, reducing signal delay; of course, the specific resistance value of the second resistor can be 100kΩ with an accuracy of 1%.

[0029] In one specific embodiment, the acquisition sub-circuit includes a switch and a pull-up power supply VCC. The pull-up power supply VCC is powered by a third resistor R116, a fourth resistor R123, and a fifth resistor R132 connected in series. The fifth resistor R132 is connected in parallel with a filter capacitor C133. One end of the fourth resistor R123 is connected in series with the fifth resistor R132, and the other end of the fourth resistor R123 is connected in series with the TP193 test point and the acquisition signal output terminal. The acquisition signal is connected to the microcontroller. The switching signal generated by the switch enters the TP193 test point and the acquisition signal output terminal in sequence through the fourth resistor R123.

[0030] Specifically, the structure of the acquisition sub-circuit is described in this embodiment: The acquisition sub-circuit in this embodiment uses a series resistor to divide the voltage, adjusting the switching signal to the input voltage range of the microcontroller's GPIO, avoiding overvoltage damage and ensuring the safety of the entire circuit; at the same time, a low-pass filter is formed by connecting the fifth resistor and the filter capacitor in parallel to suppress noise, improve the purity of the acquired signal, and facilitate accurate judgment and processing by the microcontroller.

[0031] Preferably, the acquisition sub-circuit further includes a port protection capacitor C125, through which the switch is grounded. The port protection capacitor is used for decoupling and filtering, further ensuring the processing accuracy of the switch signal and the accuracy of the acquisition signal input to the microcontroller.

[0032] In one specific embodiment, a reverse diode is provided between the acquisition sub-circuit switch and the fourth resistor. The current of the reverse diode is directed from the acquisition sub-circuit to the wake-up sub-circuit. In this embodiment, the reverse diode prevents the current from the wake-up sub-circuit from flowing into the acquisition sub-circuit when the system is in sleep mode, with the pull-up power supply off and the always-on power supply on. This avoids continuous current consumption, blocks the leakage current path during sleep mode, and thus enables the entire circuit to achieve ultra-low power consumption, significantly reducing costs. Furthermore, the unidirectional isolation of the reverse diode enhances overall anti-interference and reliability.

[0033] The examples described herein are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A controller switch wake-up circuit, characterized in that: The system includes a wake-up sub-circuit and a data acquisition sub-circuit connected in parallel. One end of each of the wake-up sub-circuit and the data acquisition sub-circuit is connected to a switch signal. The input of the wake-up sub-circuit is the switch signal, and the output is the wake-up source signal for waking up the microcontroller. The input of the data acquisition sub-circuit is the switch signal, and the output is the data acquisition signal of the switch signal. Both the wake-up source signal of the wake-up sub-circuit and the data acquisition signal of the data acquisition sub-circuit are connected to the microcontroller.

2. The controller switch wake-up circuit according to claim 1, characterized in that: The wake-up sub-circuit includes several switches, each switch is connected in series with a diode, and the several diodes are all connected in series with the same first resistor. The first resistor is connected to the wake-up source signal output terminal, and the wake-up sub-circuit is powered by a constantly lit power supply, which is connected in series with the first resistor through a second resistor.

3. The controller switch wake-up circuit according to claim 2, characterized in that: The resistance of the second resistor is much greater than the resistance of the switch signal, and the unit of the second resistor is kiloohms; the resistance of the first resistor is greater than the resistance of the second resistor, and the unit of the first resistor is megaohms.

4. The controller switch wake-up circuit according to claim 1, characterized in that: The acquisition sub-circuit includes a switch and a pull-up power supply. The pull-up power supply provides power through a third resistor, a fourth resistor, and a fifth resistor connected in series. The fifth resistor is connected in parallel with a filter capacitor. One end of the fourth resistor is connected in series with the fifth resistor, and the other end of the fourth resistor is connected in series with the TP193 test point and the acquisition signal output terminal. The acquisition signal is connected to the microcontroller. The switching signal generated by the switch enters the TP193 test point and the acquisition signal output terminal in sequence through the fourth resistor.

5. A controller switch wake-up circuit according to claim 4, characterized in that: The acquisition sub-circuit also includes a port protection capacitor, and the switch is grounded through the port protection capacitor.

6. A controller switch wake-up circuit according to claim 1 or 4, characterized in that: A reverse diode is provided between the acquisition sub-circuit switch and the fourth resistor, and the current of the reverse diode is directed from the acquisition sub-circuit to the wake-up sub-circuit.

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