A multi-voltage multi-function multiplexing reset switch self-locking circuit

Abstract

The invention discloses a multi-voltage multi-function multiplexed reset switch self-locking circuit, including a power input terminal, a power on / off control module, a power output terminal, a power-on mode isolation module, a key function isolation module, an MCU module and a multiplexed key module; the circuit has one key for multiple uses, the key can be used as a switch, and can also be used to control the MCU module signal, and the two signals do not interfere with each other; multiple power-on modes. That is, the traditional key can be used to start the machine, and the sensor signal can also be used to start the machine. And the key start-up signal and the sensor signal voltage can be different. After the signal is isolated, it will not have other effects on the circuit. It is suitable for use in multi-voltage complex circuits.

Description

Technical Field

[0001] The invention relates to the field of switch circuit control, and in particular to a multi-voltage multi-function multiplexing reset switch self-locking circuit. Background Art

[0002] There are two mainstream ways of power switch for the whole machine of the product: 1. Mechanical switch 2. Reset switch with PMOS tube and NMOS tube. When the switch is pressed, the capacitor is energized and short-circuited, which instantly turns on the PMOS tube. Then the D pole of the PMOS tube supplies power to the G pole of the NMOS tube to replace the start signal. When the power is disconnected, the S pole and D pole of the NMOS are instantly connected through the capacitor through the reset switch. The G pole signal of the PMOS is cut off, and the power of the whole machine is turned off.

[0003] Compared with the reset switch, the mechanical switch is expensive, not wear-resistant, and cannot be reused for other functions; the current mainstream reset button is used as a power switch, and cannot be reused for other control purposes under multi-voltage conditions. Or when the power supply and control can be combined, the power supply is often not really disconnected. It just puts the product into standby mode, which consumes a lot of power.

[0004] In embedded circuits, there are often more than two voltages in the circuit. In addition, the circuit is required to be small, and a single switch is used for both the power supply of the whole machine and the control. High voltage can easily be fed back into the MCU module through the key, causing damage to the MCU module. In addition, when multiple signals are required to start the machine, it is often helpless. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-voltage multi-function multiplexed reset switch self-locking circuit, which has multiple uses with one button and multiple power-on modes, so as to solve the above-mentioned multiple defects caused by the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: a multi-voltage multi-function multiplexed reset switch self-locking circuit, comprising a power input terminal, a power on / off control module, a power output terminal, and a power-on mode isolation module;

[0007] Power input terminal, used to supply power to circuit components externally;

[0008] Power on / off control, receiving the control signal of the power-on mode isolation module to turn on or off the power input and output terminals. When the module is turned on, the power input terminal is connected to the power output terminal;

[0009] The power output terminal supplies power to the circuit load. When the module is powered on, the entire product is powered;

[0010] The power-on mode isolation module isolates multiple power-on signals to avoid signal crosstalk when multiple conditions require the product to be powered on.

[0011] Preferably, the power-on signal may be provided by a button, a single-chip microcomputer, or a sensor element, and may accept a mixture of multiple voltages without causing damage to the elements.

[0012] Preferably, the power-on mode isolation module is externally connected to a key function isolation module and a multiplexing key module;

[0013] The multiplexed button module can be used to turn on the product power when the product is not turned on, and can be used as a control button after it is turned on; the button function isolation module isolates the power-on signal or the control signal of the multiplexed button signal to avoid adverse effects caused by different voltage loading together.

[0014] Preferably, the power-on mode isolation module is externally connected to an MCU module; receives the signal of the multiplexed key and performs corresponding operations, and feeds the signal back to the power-on mode isolation module.

[0015] Preferably, the power-on mode isolation module is externally connected to other power-on mode modules for waking up and starting up.

[0016] The beneficial effects of adopting the above technical solution are: the circuit has one key for multiple uses, the key can be used as a switch, and can also be used to control the MCU module signal, and the two signals do not interfere with each other; multiple startup methods. That is, you can use the traditional key to start the machine, or you can use the sensor signal to start the machine. And the key startup signal and the sensor signal voltage can be different. After the signal is isolated, it will not have other effects on the circuit. It is suitable for use in complex circuits with multiple voltages; this circuit can accept 3-24V voltage, so that it can not only work in circuits with MCU modules, but also can be used in conjunction with PIC modules; because MOS tubes are used as control units, the circuit is in the off state, and the loss is very small and can be ignored. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a circuit block diagram of the present invention.

[0018] Figure 2 It is the switch circuit diagram of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Figure 1 and Figure 2 The specific implementation mode of the present invention is presented: a multi-voltage multi-function multiplexed reset switch self-locking circuit, comprising a power input terminal, a power on / off control module, a power output terminal, and a power-on mode isolation module;

[0021] Power input terminal, used to supply power to circuit components externally;

[0022] Power on / off control, receiving the control signal of the power-on mode isolation module to turn on or off the power input and output terminals. When the module is turned on, the power input terminal is connected to the power output terminal;

[0023] The power output terminal supplies power to the circuit load. When the module is powered on, the entire product is powered;

[0024] The power-on mode isolation module isolates multiple power-on signals to avoid signal crosstalk when multiple conditions require the product to be powered on.

[0025] Preferably, the power-on signal may be provided by a button, a single-chip microcomputer, or a sensor element, and may accept a mixture of multiple voltages without causing damage to the elements.

[0026] Preferably, the power-on mode isolation module is externally connected to a key function isolation module and a multiplexing key module;

[0027] The multiplexed button module can be used to turn on the power of the product when it is not turned on, and can be used as a control button after it is turned on; the button function isolation module isolates the power-on signal or control signal of the multiplexed button signal to avoid adverse effects caused by different voltage loading together.

[0028] Preferably, the power-on mode isolation module is externally connected to an MCU module; receives the signal of the multiplexed key and performs corresponding operations, and feeds the signal back to the power-on mode isolation module.

[0029] Preferably, the power-on mode isolation module is externally connected to other power-on mode modules for waking up and starting up.

[0030] In shutdown state, the G pole of Q1 is pulled up by R17, making Q1 in cut-off state. VMCU module is 0V.

[0031] When S2 is pressed, the G pole of Q1 goes to ground via D1 and S2. Q1 is turned on. The VMCU module is powered on, the load is powered on, and the MCU module works. The MCU module signal is added to the G pole of Q2 through R63 and D6, taking over the key operation, and the G pole of Q1 goes to ground via the D and S poles of Q2, so that Q1 continues to conduct. The key loses its power-on function and can be released and used for other purposes.

[0032] When the power is on, the button is pressed, and the Power_Check signal is connected to the ground through D1 and S2, and the signal changes from the original 3.3V to about 0.3V. This signal is connected to the MCU module. At this time, due to the isolation of D1, the VBAT signal will not enter 3.3V, and the 3.3V signal will not enter VBAT. The MCU module can identify different commands by the length of time or number of times the button is pressed.

[0033] When the power is turned off, the VS IN signal appears, and passes through R62 and D6 to the G pole of Q2, and Q2 is turned on. The G pole of Q1 is connected to the ground through the S and D poles of Q2, and Q1 is turned on. The VMCU module resumes power supply, and the MCU module works. Just like the key-press power on, the MCU module signal passes through R63 and D6 and is added to the G pole of Q2, replacing the VSIN signal. The VSIN signal can be 3-24V.

[0034] In traditional circuits, the voltage is single, and can even only accept voltages below 5V. This circuit can mix multiple voltages, and can accept both 3.3V microcontroller signals and 24V sensor signals.

[0035] In traditional circuits, the device can only be powered on by pressing a button. In this circuit, it can be powered on not only by a button, but also by external signals, such as sensor, PLC wake-up, etc. Regarding PLC wake-up, the button can be powered on not only by the MCU (PIC), but also by the PLC. This shows its functional diversity.

[0036] In traditional circuits, the key signal is used either for power-on or for MCU module control. If both power-on and MCU module control are required, the circuit cannot be completely powered off, and the standby power consumption is large. Based on the traditional circuit, the key signal of this circuit can be used for power-on and MCU module control. In the shutdown state, the load circuit can also be completely disconnected to minimize the shutdown power consumption.

[0037] This circuit has one key for multiple uses. The key can be used as a switch or as a control signal for the MCU module. The two signals do not interfere with each other. There are multiple ways to start the machine. You can use the traditional key to start the machine, or you can use the sensor signal to start the machine. And the key start signal and the sensor signal voltage can be different. After the signal is isolated, it will not have other effects on the circuit. It is suitable for use in complex circuits with multiple voltages. This circuit can accept 3-24V voltage, so that it can not only work in circuits with MCU modules, but also can be used with PLC modules. Because MOS tubes are used as control units, the circuit has very small losses when it is turned off and can be ignored.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A multi-voltage multi-function multiplexing reset switch self-locking circuit, characterized in that: It includes a power input terminal, a power on / off control module, a power output terminal, and a power-on mode isolation module; Power input terminal, used to supply power to circuit components externally; The power on / off control module receives the control signal of the power-on mode isolation module to turn on or off the power input and output terminals. When the module is turned on, the power input terminal is connected to the power output terminal. The power output terminal supplies power to the circuit load. When the module is powered on, the entire product is powered; The power-on mode isolation module isolates multiple power-on signals to avoid signal crosstalk when multiple conditions require the product to be powered on. The power-on mode isolation module is externally connected to a key function isolation module and a multiplexing key module; The multiplexed button module can be used to turn on the power of the product when it is not turned on, and can be used as a control button after it is turned on; the button function isolation module isolates the power-on signal of the multiplexed button signal or the control signal to avoid adverse effects caused by different voltage loading together; Specifically, the multi-voltage multi-function multiplexed reset switch self-locking circuit includes a MOS tube Q1, a MOS tube Q2, a button S2, a diode D1 and a diode D2, the source of the MOS tube Q1 is connected to an external power supply, the drain of the MOS tube Q1 is connected to an MCU module, the gate of the MOS tube Q1 is connected to the drain of the MOS tube Q2, the source of the MOS tube Q2 is grounded, the gate of the MOS tube Q2 is connected to the MCU module through a reverse diode D7 and a resistor R63, one end of the button S2 is connected to the gate of the MOS tube Q1 through a reverse diode D1, the other end of the button S2 is grounded, the end of the button S2 connected to the MOS tube Q1 is also connected to the MCU module through a reverse diode D2, and the positive electrode of the diode D2 is connected to a voltage of 3.3V through a resistor R26.

2. A multi-voltage multi-function multiplexed reset switch self-locking circuit according to claim 1, characterized in that: The power-on signal is given by a button, a single-chip microcomputer or a sensor element, and can accept a mixture of multiple voltages without causing damage to the element.

3. The multi-voltage multi-function multiplexed reset switch self-locking circuit according to claim 1, characterized in that: The power-on mode isolation module is externally connected to an MCU module; it receives the signal of the multiplexed key and performs corresponding operations, and feeds the signal back to the power-on mode isolation module.

4. The multi-voltage multi-function multiplexed reset switch self-locking circuit according to claim 1, characterized in that: The power-on mode isolation module is externally connected to other power-on mode modules for waking up and starting up.

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