Low-cost quick on-off circuit

Abstract

The utility model discloses a low-cost quick on-off circuit, which comprises a first module, a second module, a third module and a fourth module, the first module is electrically connected between the input module and the fourth module and is used for controlling on or off of the input module to the fourth module; the second module is electrically connected with the first module and is used for controlling the first module to be switched on or switched off; the third module is electrically connected with the second module and is used for controlling the second module to be switched on or switched off; and the fourth module is used for transmitting the input voltage to a subsequent system circuit. By implementing the on-off circuit, the on-off of equipment can be realized only by hardware, programmable electronic elements such as a singlechip are not needed, the product cost is reduced, and meanwhile, the problem that the existing on-off circuit is inconvenient to operate is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power on / off control, in particular to a low-cost quick power on / off circuit. Background Art

[0002] For some electronic devices, long pressing the power button can turn on the device. It usually takes several seconds to turn on the device. It is difficult for users to grasp the long pressing time, resulting in poor user experience. In the powered-on state, long pressing the power button can achieve soft shutdown. The control of the power-on and power-off process requires the participation of the main control chip DSP or MCU, but the main control chip cannot respond to the shutdown signal when it is dead. The power can only be turned off by unplugging the battery / power supply, which is very inconvenient. In addition, plugging and unplugging the battery / power supply when the system is powered on can easily cause system power supply oscillation and damage the system circuit.

[0003] On the other hand, the power on and off circuit is required to have false operation protection, anti-jitter, and software controllable functions, but the existing power on and off circuit requires a programmable device (such as a single-chip microcomputer), and the circuit needs to be programmed to participate in the power on and off process; in addition, the power on and off time setting is achieved by software, which leads to a relatively high price for the overall circuit. Utility Model Content

[0004] The existing power on / off circuit is inconvenient to operate and requires programmable components such as microcontrollers to implement, which increases the cost of the product.

[0005] In view of the above problems, a low-cost quick power on / off circuit is proposed. By setting a first module in the power on / off circuit to control the on / off of the input module to the fourth module, and setting a third module and a second module to control the conduction or cutoff of the first module, the power on / off of the device can be achieved by hardware alone, without the need for programmable electronic components such as single-chip microcomputers, thereby reducing the cost of the product and solving the problem of inconvenient operation of the existing power on / off circuit.

[0006] A low-cost quick power on / off circuit, comprising:

[0007] Module 1;

[0008] Module 2;

[0009] Module 3;

[0010] Module 4;

[0011] The first module is electrically connected between the input module and the fourth module, and is used to control the on or off of the input module to the fourth module;

[0012] The second module is electrically connected to the first module and is used to control the conduction or cutoff of the first module;

[0013] The third module is electrically connected to the second module and is used to control the conduction or cutoff of the second module;

[0014] The fourth module is used to transmit the input voltage to the subsequent system circuit.

[0015] In combination with the low-cost quick power on / off circuit of the utility model, in a first possible implementation manner, the first module includes:

[0016] A first switching tube;

[0017] a first resistor;

[0018] A second resistor;

[0019] The first end of the first resistor is connected to the input module and the source of the first switch tube;

[0020] The second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor is electrically connected to the gate of the first switch tube.

[0021] In combination with the first possible implementation manner of the utility model, in a second possible implementation manner, the second module includes:

[0022] The second switch tube;

[0023] Locking unit;

[0024] The second switch tube is electrically connected to the locking unit and is used to control the on or off of the first module;

[0025] The locking unit is used to lock the first switch tube after it is turned on to keep it in the turned-on state.

[0026] In combination with the second possible implementation manner of the utility model, in a third possible implementation manner, the locking unit includes:

[0027] The third resistor;

[0028] a fourth resistor;

[0029] The collector of the second switch tube is electrically connected to the second end of the first resistor and the first end of the second resistor;

[0030] The base of the second switch tube is electrically connected to the first end of the third resistor, the first end of the fourth resistor and the third module;

[0031] A second end of the third resistor is grounded, and a second end of the fourth resistor is electrically connected to the fourth module.

[0032] In combination with the third possible implementation manner of the utility model, in a fourth possible implementation manner, the third module includes:

[0033] Switch button;

[0034] Energy storage unit;

[0035] Pull-down unit;

[0036] The switch button is electrically connected to the base of the second switch tube and the energy storage unit respectively, and is used to control the conduction or cutoff of the second switch tube;

[0037] The pull-down unit is electrically connected to the energy storage unit and is used to pull down the potential of the energy storage unit to shut down the device.

[0038] In combination with the fourth possible implementation manner of the utility model, in a fifth possible implementation manner, the energy storage unit includes:

[0039] a fifth resistor, a first capacitor and a second capacitor;

[0040] The pull-down unit is a first diode;

[0041] The first end of the fifth resistor is electrically connected to the second end of the first resistor, the first end of the second resistor, and the collector of the second switch tube;

[0042] The second end of the fifth resistor is electrically connected to the first end of the first capacitor, the first end of the second capacitor, the switch button, and the first end of the first diode;

[0043] The second end of the first capacitor and the second end of the second capacitor are grounded;

[0044] The second end of the first diode is electrically connected to the fourth module.

[0045] In combination with the fifth possible implementation of the utility model, in a sixth possible implementation, the fourth module includes:

[0046] A second diode;

[0047] The first end of the second diode is electrically connected to the second end of the fourth resistor, and the second end of the second diode is used for outputting voltage.

[0048] In combination with the low-cost quick switch circuit described in the utility model, in a seventh possible implementation manner, the first switch tube is a MOS tube, and the second switch tube is a triode.

[0049] The low-cost quick power-on and power-off circuit described in the utility model is implemented by setting a first module in the power-on and power-off circuit to control the on or off of the input module to the fourth module, and setting a third module and a second module to control the conduction or cutoff of the first module. The power on and off of the device can be achieved by hardware alone, without the need for programmable electronic components such as single-chip microcomputers, thereby reducing the cost of the product and solving the problem of inconvenient operation of the existing power-on and power-off circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0051] Figure 1 It is a schematic diagram of the module connection of the low-cost quick power on / off circuit in the utility model;

[0052] Figure 2 The figure is a schematic diagram of the circuit structure of the low-cost quick power on / off circuit in the utility model. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the utility model.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0055] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0056] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] The existing power on / off circuit is inconvenient to operate and requires programmable components such as microcontrollers to implement, which increases the cost of the product.

[0059] In view of the above problems, a low-cost quick power on / off circuit is proposed.

[0060] A low-cost quick switch circuit, such as Figure 1 , Figure 1 The module connection diagram of the low-cost quick switch circuit in the utility model includes a first module 200, a second module 300, a third module 400, and a fourth module 500; the first module 200 is electrically connected between the input module 100 and the fourth module 500, and is used to control the on or off of the input module 100 to the fourth module 500; the second module 300 is electrically connected to the first module 200, and is used to control the on or off of the first module 200; the third module 400 is electrically connected to the second module 300, and is used to control the on or off of the second module 300; the fourth module 500 is used to transmit the input voltage to the subsequent system circuit. By setting the first module 200 in the switch circuit to control the on or off of the input module 100 to the fourth module 500, and setting the third module 400 and the second module 300 to control the on or off of the first module 200, the switch of the device can be realized only by hardware, without the need for programmable electronic components such as single-chip microcomputers, reducing the cost of the product, and solving the problem of inconvenient operation of the existing switch circuit.

[0061] Specifically, Figure 2 , Figure 2The schematic diagram of the circuit structure of the low-cost quick switch circuit in the utility model. The first module 200 includes a first switch tube Q1, a first resistor R1, and a second resistor R2; the first end of the first resistor R1 is connected to the input module 100 and the source of the first switch tube Q1; the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is electrically connected to the gate of the first switch tube Q1.

[0062] Specifically, Figure 2 The second module 300 includes a second switch tube Q2 and a locking unit 310; the second switch tube Q2 is electrically connected to the locking unit 310 to control the conduction or cutoff of the first module 200; the locking unit 310 is used to lock the first switch tube Q1 after it is turned on to maintain the conduction state.

[0063] Specifically, Figure 2 The locking unit 310 includes a third resistor R3 and a fourth resistor R4; the collector of the second switch tube Q2 is electrically connected to the second end of the first resistor R1 and the first end of the second resistor R2; the base of the second switch tube Q2 is electrically connected to the first end of the third resistor R3, the first end of the fourth resistor R4 and the third module 400; the second end of the third resistor R3 is grounded, and the second end of the fourth resistor R4 is electrically connected to the fourth module 500.

[0064] Specifically, Figure 2 The third module 400 includes a switch button S1, an energy storage unit 410, and a pull-down unit 420; the switch button S1 is electrically connected to the base of the second switch tube Q2 and the energy storage unit 410, respectively, for controlling the conduction or cutoff of the second switch tube Q2; the pull-down unit 420 is electrically connected to the energy storage unit 410, for lowering the potential of the energy storage unit 410 to shut down.

[0065] Specifically, Figure 2 The energy storage unit 410 includes: a fifth resistor R5, a first capacitor C1 and a second capacitor C2; the pull-down unit 420 is a first diode D1; the first end of the fifth resistor R5 is electrically connected to the second end of the first resistor R1, the first end of the second resistor R2, and the collector of the second switch tube Q2; the second end of the fifth resistor R5 is electrically connected to the first end of the first capacitor C1, the first end of the second capacitor C2, the switch button S1, and the first end of the first diode D1; the second end of the first capacitor C1 and the second end of the second capacitor C2 are grounded; the second end of the first diode D1 is electrically connected to the fourth module 500.

[0066] Specifically, Figure 2 The fourth module 500 includes: a second diode D2; a first end of the second diode D2 is electrically connected to a second end of the fourth resistor R4, and a second end of the second diode D2 is used for outputting a voltage.

[0067] Preferably, the first switch tube Q1 is a MOS tube, and the second switch tube Q2 is a triode.

[0068] Working principle: When the input module 100 (Vin) is powered on, the capacitors C1 and C2 are charged through the resistors R1 and R5. Charging is a slow process, and the voltage of the capacitors C1 and C2 rises slowly. At this time, the G pole of the MOS tube Q1 in the circuit is pulled up to the power supply by the resistors R1 and R2, and the S pole and the G pole are both high level, so Q1 is in the cut-off state. Point A is high level; point B is low level; point C is high level; point D is low level; point E is high level.

[0069] When the switch button S1 is pressed, the voltage of capacitors C1 and C2 is added to the base of transistor Q2, making transistor Q2 conduct. At this time, the G pole of MOS tube Q1 is pulled down to a low level by the transistor through resistor R2, and MOS tube Q1 is turned on, so that the voltage at point A passes through the MOS tube to point B, supplying power to the subsequent system. At the same time, the output voltage is added to the base of the transistor through resistors R3 and R4, which plays a locking role, that is, after the button is released, the transistor Q2 is kept on. In addition, capacitors C1 and C2 are pulled down by the transistor through diode D1 for discharge, so that the voltage on C1 and C2 is low. Point A is high level; point B is high level; point C is low level; point D is equal to 0.7V; point E is low level.

[0070] When the switch button S1 is pressed again, the voltage of the base of transistor Q2 is pulled down due to the low voltage of capacitors C1 and C2, making transistor Q2 cut off. The G pole of MOS tube Q2 is pulled up to the power supply by resistors R2 and R1, and both the S pole and the G pole are high level, so Q1 is in the cut-off state, thereby cutting off the voltage at point B and realizing the shutdown function. Point A is high level; point B is low level; point C is high level; point D is low level; the voltage at point E rises slowly.

[0071] The low-cost quick power on / off circuit of the utility model is implemented by setting the first module 200 in the power on / off circuit to control the on / off of the input module 100 to the fourth module 500, and setting the third module 400 and the second module 300 to control the conduction or cutoff of the first module 200. The power on / off of the device can be realized by hardware alone, without the need for programmable electronic components such as single-chip microcomputers, thereby reducing the cost of the product and solving the problem of inconvenient operation of the existing power on / off circuit.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-cost quick power on / off circuit, comprising: Module 1; Module 2; Module 3; Module 4; The first module is electrically connected between the input module and the fourth module, and is used to control the on or off of the input module to the fourth module; The second module is electrically connected to the first module and is used to control the conduction or cutoff of the first module; The third module is electrically connected to the second module and is used to control the conduction or cutoff of the second module; The fourth module is used to transmit the input voltage to the subsequent system circuit.

2. The low-cost quick power on / off circuit according to claim 1, characterized in that: The first module includes: A first switching tube; a first resistor; A second resistor; The first end of the first resistor is connected to the input module and the source of the first switch tube; The second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor is electrically connected to the gate of the first switch tube.

3. The low-cost quick power on / off circuit according to claim 2, characterized in that: The second module includes: The second switch tube; Locking unit; The second switch tube is electrically connected to the locking unit and is used to control the on or off of the first module; The locking unit is used to lock the first switch tube after it is turned on to maintain the turned-on state.

4. The low-cost quick power on / off circuit according to claim 3, characterized in that: The locking unit comprises: The third resistor; a fourth resistor; The collector of the second switch tube is electrically connected to the second end of the first resistor and the first end of the second resistor; The base of the second switch tube is electrically connected to the first end of the third resistor, the first end of the fourth resistor and the third module; A second end of the third resistor is grounded, and a second end of the fourth resistor is electrically connected to the fourth module.

5. The low-cost quick on / off circuit according to claim 4, characterized in that: The third module includes: Switch button; Energy storage unit; Pull-down unit; The switch button is electrically connected to the base of the second switch tube and the energy storage unit respectively, and is used to control the conduction or cutoff of the second switch tube; The pull-down unit is electrically connected to the energy storage unit and is used to pull down the potential of the energy storage unit to shut down the device.

6. The low-cost quick power on / off circuit according to claim 5, characterized in that: The energy storage unit comprises: a fifth resistor, a first capacitor and a second capacitor; The pull-down unit is a first diode; The first end of the fifth resistor is electrically connected to the second end of the first resistor, the first end of the second resistor, and the collector of the second switch tube; The second end of the fifth resistor is electrically connected to the first end of the first capacitor, the first end of the second capacitor, the switch button, and the first end of the first diode; The second end of the first capacitor and the second end of the second capacitor are grounded; The second end of the first diode is electrically connected to the fourth module.

7. The low-cost quick power on / off circuit according to claim 6, characterized in that: The fourth module comprises: A second diode; The first end of the second diode is electrically connected to the second end of the fourth resistor, and the second end of the second diode is used for outputting voltage.

8. The low-cost quick power on / off circuit according to any one of claims 3 to 7, characterized in that: The first switch tube is a MOS tube, and the second switch tube is a triode.

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