A multiway switch starting circuit

Abstract

The utility model relates to electronic equipment starting control technical field, concretely provides a kind of multiway switch starting circuit, including power input terminal VB+, and MCU power supply unit, switch unit, activation unit, maintenance unit, the switch unit includes diode D1, charging capacitor C3, switch SW1, activation unit includes resistance R1, resistance R2, transistor Q1, maintenance unit includes transistor Q2;The utility model passes through the innovative hardware circuit design, has realized the one-key direct operation of any function key all can directly wake up system and execute corresponding function, completely saved independent power key, so that user operation is more intuitive convenient;The circuit is in standby time MCU complete power off, realizes zero standby power consumption, significantly energy-saving and prolongs battery endurance;The scheme supports to easily extend multiway switch by simple parallel connection, greatly improves the flexibility of multifunctional equipment design.

Description

Technical Field

[0001] This utility model relates to the field of electronic device start-up control technology, specifically to a multi-channel switch start-up circuit. Background Technology

[0002] Currently, multifunctional electronic devices such as power tools and smart home appliances typically have multiple physical buttons to control different functions. The common startup control scheme for these devices is as follows: a separate main power switch is provided, which the user must first turn on to power the entire system, especially the microcontroller unit (MCU), and put it into working or standby mode. Only then can the MCU begin scanning and detecting the trigger signals of other function buttons to execute the corresponding function control.

[0003] A published Chinese patent, CN212627736U, discloses a load starting circuit and a power tool. The load starting circuit includes: an MCU; a start switch, one end of which is connected to a battery pack, and the other end to the MCU; a battery pack detection module, one end of which is connected to the battery pack, and the other end to the MCU; the battery pack detection module includes: a first resistor with its first end connected to the battery pack; a second resistor with its first end connected to the second end of the first resistor and its second end grounded; a capacitor connected in parallel with the second resistor; and a first switching transistor, whose control terminal is connected to the second end of the first resistor, its input terminal connected to the MCU, and its output terminal grounded. This solution wakes up the MCU by detecting the insertion of the battery pack, thus eliminating the need for a mechanical power switch. However, this solution still requires a specific start switch or relies on the battery pack detection module to activate the system, and does not fundamentally change the two-step operation logic of waking up the system first and then executing functions. The operation steps are cumbersome and inconvenient to use. Furthermore, to ensure that function key operations can be responded to at any time, the system's main control circuit or part of the detection circuit needs to be in a powered standby state for a long time, generating unnecessary no-load power consumption, which is detrimental to the energy saving and battery life of the equipment. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a multi-way switch start-up circuit. Through innovative hardware circuit design, it realizes one-click operation that allows any function key to directly wake up the system and execute the corresponding function, completely eliminating the need for a separate power button and making user operation more intuitive and convenient. The circuit completely shuts down the MCU in standby mode, achieving zero standby power consumption, significantly saving energy and extending battery life. It solves the problem of cumbersome operation steps and unnecessary idle power consumption caused by the two-step operation logic of waking up the system first and then executing the function in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides a multi-channel switch start-up circuit, including a power input terminal VB+ and an MCU power supply unit. The circuit includes: A switching unit, comprising a diode D1, a charging capacitor C3, and a switch SW1, wherein one end of the charging capacitor C3 is connected to the output terminal of the diode D1 and the other end is connected to the switch SW1, and the other end of the switch SW1 is grounded. The activation unit includes resistors R1 and R2, and transistor Q1. Resistors R1 and R2 are connected in series, with one end connected to the power input terminal VB+ and the other end connected to the input terminal of diode D1. The gate and source of transistor Q1 are connected to the two ends of resistor R1, and the drain is connected to the MCU power supply unit. The sustaining unit includes a transistor Q2, whose gate is connected to the MCU, its drain is connected to a resistor R2, and its source is grounded.

[0006] In one embodiment of the present invention, the switching unit further includes a switch detection terminal SW1_Detection, a detection resistor R4, and a diode D2. One end of the switch detection terminal SW1_Detection and one end of the detection resistor R4 are simultaneously connected to the input terminal of the diode D2, and the output terminal of the diode D2 is connected to the other end of the switch SW1 and the detection resistor R4 and grounded.

[0007] In one embodiment of the present invention, the switching unit further includes a resistor R3, which is connected in parallel across the charging capacitor C3 to provide a discharge circuit.

[0008] In one embodiment of this utility model, multiple switching units are provided, and the multiple switching units are connected in parallel on the resistor R2 of the activation unit to realize multi-channel start-up control.

[0009] In one embodiment of the present invention, the MCU power supply unit adopts an LDO voltage regulator chip U1, the input terminal of the LDO voltage regulator chip U1 is connected to the drain of transistor Q1, and the output terminal is connected to the MCU.

[0010] In one embodiment of the present invention, a resistor R5 is connected in series on the gate of the transistor Q2, and a resistor R6 is connected in parallel between the gate and the source of the transistor Q.

[0011] In one embodiment of the present invention, transistor Q1 is an NPN transistor and transistor Q2 is a PNP transistor.

[0012] As described above, the multi-channel switch start-up circuit of this utility model has the following beneficial effects: This invention, through innovative hardware circuit design, not only recognizes any function key as a function command when triggered, but also directly activates the system's power supply, completely eliminating the need to find and operate a dedicated power button, greatly simplifying the user's operation process and improving the user experience. Since the MCU and its power supply unit are completely powered off when no button is pressed, theoretically, the standby power consumption is zero. Power is only supplied to the system through the cooperation of the activation and maintenance units at the moment the button is pressed, significantly reducing standby power consumption. This is especially suitable for battery-powered portable devices, effectively extending battery life. The circuit adopts a parallel structure, allowing for easy expansion of multiple function switch units. Adding a new function only requires adding an identical set of switches, diodes, and detection circuits, without changing the core activation and maintenance architecture, providing great flexibility for multi-functional product design. This solution features a simple circuit structure, fast response speed, strong anti-interference capability, high stability, and low hardware cost, making it easy to industrialize and possessing good market application prospects. Attached Figure Description

[0013] Figure 1 The diagram shown is a schematic of the multi-channel switch start-up circuit disclosed in this utility model. Detailed Implementation

[0014] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0015] Please see Figure 1 It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0016] Please see Figure 1This utility model provides a multi-channel switch start-up circuit, including a power input terminal VB+, an MCU power supply unit 1, at least one switch unit 2, an activation unit 3, and a sustaining unit 4. The MCU power supply unit 1 uses an LDO voltage regulator chip U1, with its input terminal connected to the drain of transistor Q1 and its output terminal connected to the MCU. The switch unit 2 includes a diode D1, a charging capacitor C3, a switch SW1, and a resistor R3. One end of the charging capacitor C3 is connected to the output terminal of diode D1, and the other end is connected to switch SW1. The other end of switch SW1 is grounded. Resistor R3 is connected in parallel across the charging capacitor C3 to provide a discharge circuit. The switch unit 2 also includes a switch detection terminal SW1_Detection, a detection resistor R4, and a diode D2. One end of the switch detection terminal SW1_Detection and one end of the detection resistor R4 are simultaneously connected to the input terminal of diode D2. The output terminal of diode D2 is connected to switch SW1, and the other end of the detection resistor R4 is grounded. The activation unit 3 includes resistors R1 and R2, and an NPN transistor Q1. Resistors R1 and R2 are connected in series, with one end connected to the power input terminal VB+ and the other end connected to the input terminal of diode D1. The gate and source of transistor Q1 are connected to the two ends of resistor R1, and the drain is connected to the MCU power supply unit 1. The sustaining unit 4 includes a PNP transistor Q2. The gate of transistor Q2 is connected to the MCU, the drain is connected to resistor R2, and the source is grounded. A resistor R5 is connected in series on the gate of transistor Q2, and a resistor R6 is connected in parallel between the gate and source of transistor Q2.

[0017] This invention, through innovative hardware circuit design, not only recognizes any function key as a function command when triggered, but also directly triggers system activation and power supply, completely eliminating the need to find and operate a dedicated power button, greatly simplifying the user operation process and improving the user experience. Since the MCU and its power supply unit are completely powered off when no button is pressed, the standby power consumption is theoretically zero. Power is only supplied to the system through the cooperation of the activation unit and the maintenance unit at the moment the button is pressed, significantly reducing the system's standby power consumption. It is especially suitable for battery-powered portable devices and can effectively extend the battery life.

[0018] Multiple switching units 2 are provided, and multiple switching units 2 are connected in parallel to resistor R2 of activation unit 3 to realize multi-channel start-up control. This circuit adopts a parallel structure, which can easily expand multiple functional switching units. To add a new function, only one set of identical switches, diodes and detection circuits needs to be added. There is no need to change the core activation and maintenance architecture, which provides great flexibility for the multi-functional design of products.

[0019] 1) The system activation of this utility model is as follows: any function key in the circuit can be triggered to activate the system. Taking the trigger switch SW1 as an example, when the switch SW1 is pressed, the power supply VB+ passes through resistor R1, resistor R2, diode D1, charging capacitor C3, and switch SW1 to ground, forming a charging circuit for charging and discharging capacitor C3. The charging current generates a voltage drop across resistor R1, which will turn on transistor Q1. After transistor Q1 turns on, it supplies power to the system MCU through LDO voltage regulator chip U1. After the MCU is powered on, it outputs a high potential through the "LockSignal" pin to turn on transistor Q2, keeping transistor Q1 continuously conducting, thus realizing system activation.

[0020] 2) The function key recognition of this utility model is as follows: When the system MCU is powered on, the system 5V voltage is applied to the switch detection terminal SW1_Detection through the detection resistor R4. Since the MCU power-on time is very short, about 10ms, while the human body triggers the button switch for a period of 50-100ms, which is much longer than 10ms, when the switch detection terminal SW1_Detection detects a low potential, it means that the switch SW1 is pressed. The MCU detects and executes the corresponding function program to realize the recognition of the function key. Furthermore, due to the isolation of the diode D2, the MCU can accurately identify which switch is triggered.

[0021] This solution, through ingenious hardware circuit design, enables a single function key to simultaneously perform the dual tasks of system wake-up and function triggering. It features intuitive operation, extremely low standby power consumption, rapid response, high stability, and easy expansion, making it particularly suitable for battery-powered multifunctional portable electronic devices.

[0022] In summary, this invention, through innovative hardware circuit design, enables one-click operation where any function key can directly wake up the system and execute the corresponding function, completely eliminating the need for a separate power button and making user operation more intuitive and convenient. The circuit completely de-energizes the MCU during standby, achieving zero standby power consumption, significantly saving energy and extending battery life. The entire process is implemented using discrete components, resulting in fast response, high stability, strong anti-interference capabilities, and low cost. This solution supports easy expansion of multiple switches through simple parallel connection, greatly improving the flexibility of multi-functional device design. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and has high industrial application value.

[0023] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A multi-channel switch start-up circuit, comprising a power input terminal VB+ and an MCU power supply unit (1), characterized in that, The circuit includes: Switching unit (2), the switching unit (2) includes diode D1, charging capacitor C3, and switch SW1. One end of charging capacitor C3 is connected to the output terminal of diode D1 and the other end is connected to switch SW1. The other end of switch SW1 is grounded. The activation unit (3) includes resistor R1, resistor R2, and transistor Q1. Resistors R1 and R2 are connected in series, with one end connected to the power input terminal VB+ and the other end connected to the input terminal of diode D1. The gate and source of transistor Q1 are connected to the two ends of resistor R1, and the drain is connected to the MCU power supply unit (1). The sustaining unit (4) includes a transistor Q2, the gate of which is connected to the MCU, the drain of which is connected to the resistor R2, and the source of which is grounded.

2. The multi-channel switch start-up circuit according to claim 1, characterized in that: The switching unit (2) also includes a switch detection terminal SW1_Detection, a detection resistor R4, and a diode D2. One end of the switch detection terminal SW1_Detection and one end of the detection resistor R4 are connected to the input terminal of the diode D2, and the output terminal of the diode D2 is connected to the other end of the switch SW1 and the detection resistor R4 and grounded.

3. The multi-channel switch start-up circuit according to claim 2, characterized in that: The switching unit also includes a resistor R3, which is connected in parallel across the charging capacitor C3 to provide a discharge circuit.

4. The multi-channel switch start-up circuit according to claim 3, characterized in that: The switching unit (2) is provided in multiple ways, and the multiple switching units (2) are connected in parallel on the resistor R2 of the activation unit (3) to realize multi-channel start control.

5. The multi-channel switch start-up circuit according to claim 1, characterized in that: The MCU power supply unit (1) uses an LDO voltage regulator chip U1. The input terminal of the LDO voltage regulator chip U1 is connected to the drain of transistor Q1, and the output terminal is connected to the MCU.

6. The multi-channel switch start-up circuit according to claim 1, characterized in that: A resistor R5 is connected in series with the gate of the transistor Q2, and a resistor R6 is connected in parallel between the gate and the source of the transistor Q.

7. The multi-channel switch start-up circuit according to claim 1, characterized in that: Transistor Q1 is an NPN transistor, and transistor Q2 is a PNP transistor.

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