Startup and shutdown button circuit

Abstract

The utility model discloses a switch-on and switch-off button circuit which comprises a switch-on and switch-off button special chip U1, a button SW, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2 and a third resistor R3. A pin PB of the switch-on and switch-off button special chip U1 is electrically connected with one end of the first resistor R1. The other end of the first resistor R1 is electrically connected with one end of the first capacitor C1 and one end of the button SW, the other end of the first capacitor C1 is electrically connected with the other end of the button SW, one end of the second capacitor C2, one end of the third capacitor C3, a GND pin of the on-off key special chip U1 and one end of the fourth capacitor C4, and the other end of the second capacitor C2 is electrically connected with an OFFT pin of the on-off key special chip U1. The on-off button circuit is simple in structure and convenient to use, the resistor is configured by adjusting the on-off time, and the functions of short-press on-off and long-press off-off are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of button circuits, in particular to a switch button circuit. Background Art

[0002] One-touch power on and off is widely used in electronic products, for example, the power button in a mobile phone allows users to power on with a short press or a long press, quickly, conveniently and flexibly controlling the power switch. In a power-on circuit with adjustable switching time, an adjustable electronic component, such as a capacitor, is usually required to control the on and off time of the switch.

[0003] In electronic technology, a switch is a common electronic component that can be used to control the on and off of current. In a power-on circuit with adjustable on / off time, the on / off time of the switch needs to be adjustable to meet different application requirements. In a control system, the power-on circuit with adjustable on / off time can be adjusted by an external control signal, such as a potentiometer or an electronic switch. These control signals can be generated and transmitted by digital or analog circuits.

[0004] The existing power-on circuits are usually unable to adjust the switching time, while the power-on circuits that can adjust the switching time have complex structures.

[0005] Based on the above situation, the utility model proposes a power on / off button circuit, which can effectively solve the above problems. Utility Model Content

[0006] The utility model aims to provide a power button circuit. The power button circuit of the utility model has a simple structure and is easy to use. By adjusting the power on and off time configuration resistor, the functions of short press power on and long press power off are realized.

[0007] The utility model is realized by the following technical solutions:

[0008] A power button circuit includes a power button dedicated chip U1, a button SW, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, and a third resistor R3. The PB pin of the power button dedicated chip U1 is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is respectively electrically connected to one end of the first capacitor C1 and one end of the button SW, the other end of the first capacitor C1 is respectively electrically connected to the other end of the button SW, one end of the second capacitor C2, one end of the third capacitor C3, the GND pin of the power button dedicated chip U1, and one end of the fourth capacitor C4, the other end of the second capacitor C2 is electrically connected to the OFFT pin of the power button dedicated chip U1, the other end of the third capacitor C3 is electrically connected to the ONT pin of the power button dedicated chip U1, the other end of the fourth capacitor C4 is respectively electrically connected to the KILL pin, the INT pin, and the third resistor R3 of the power button dedicated chip U1, and the EN pin of the power button dedicated chip U1 is electrically connected to the second resistor R2.

[0009] The utility model aims to provide a power button circuit. The power button circuit of the utility model has a simple structure and is easy to use. By adjusting the power on and off time configuration resistor, the functions of short press power on and long press power off are realized.

[0010] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0011] 1. The circuit is simple and only requires one physical button. By adjusting the capacitance of the second capacitor C2 and the third capacitor C3, the time for pressing the button when turning on and the time for pressing the button when turning off can be adjusted.

[0012] 2. Energy-saving and efficient, the button can be connected to the ground through a momentary switch to provide on / off control with the help of the EN pin of the switch button dedicated chip U1. An internal 100k third resistor R3 is connected to an internal 1.9V bias voltage, which can pull up the stable performance button SW input to 26.4V from the outside without consuming additional current;

[0013] 3. Wide range of applications, can operate in a wide input voltage range of 2.7V to 26V. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as a limitation on this patent.

[0016] Embodiment 1:

[0017] like Figure 1 As shown, the utility model provides a power button circuit, including a power button dedicated chip U1, a button SW, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, and a third resistor R3. The PB pin of the power button dedicated chip U1 is electrically connected to one end of the first resistor R1, and the other end of the first resistor R1 is respectively electrically connected to one end of the first capacitor C1 and one end of the button SW. The other end of the first capacitor C1 is respectively electrically connected to the other end of the button SW, one end of the second capacitor C2, one end of the third capacitor C3, the GND pin of the power button dedicated chip U1, and one end of the fourth capacitor C4. The other end of the second capacitor C2 is electrically connected to the OFFT pin of the power button dedicated chip U1, the other end of the third capacitor C3 is electrically connected to the ONT pin of the power button dedicated chip U1, the other end of the fourth capacitor C4 is respectively electrically connected to the KILL pin, the INT pin, and the third resistor R3 of the power button dedicated chip U1, and the EN pin of the power button dedicated chip U1 is electrically connected to the second resistor R2.

[0018] When power is first applied to the system, the device will initialize the output pins. Therefore, any DC / DC converter connected to the POW-EN pin will be kept in the off state.

[0019] When the power is turned on, it is detected that the button SW is pressed, and according to the capacitance of the third capacitor C3, the EN pin of the power button dedicated chip U1 will output a power-on signal. By adjusting the capacitance of the third capacitor C3, the time required to press the button SW when turning on can be adjusted.

[0020] When shutting down, it is detected that the button SW is pressed, and according to the capacitance of the second capacitor C2, the EN pin of the power button dedicated chip U1 will output a shutdown signal. By adjusting the capacitance of the second capacitor C2, the time required to press the button SW when shutting down can be adjusted.

[0021] A general purpose push button on / off controller chip allows the system to be powered on and off in a controlled manner.

[0022] Placing an external capacitor to ground to the ONT pin of the on / off button chip U1 can determine the additional time that the PB pin must remain at a low level before the enable output is asserted (i.e., time beyond the internal default of 32ms).

[0023] Place an external capacitor to ground to the OFFT pin of the on / off button chip U1 to determine the additional time (i.e., beyond the internal default 32ms) that the PB pin must remain at a low level before initiating a power-off sequence (INT falling).

[0024] The EN pin of the power button dedicated chip U1 is an open-drain enable output. This pin is used to enable the system power supply. The EN pin is determined to be high after a valid PB turn-on event. If the following occurs, EN is released to a low level:

[0025] a) The KILL pin is not driven high by the microprocessor within 512ms of the initial valid PB power-on event;

[0026] b) The KILL pin is driven low during normal operation;

[0027] c) A second valid PB event is detected (power off).

[0028] The startup circuit with adjustable switching time has the following advantages:

[0029] Flexibility: Through adjustable switching time, it can meet different application requirements, such as time switch, delay switch, etc.

[0030] Reliability: A power-on circuit with adjustable switching time can improve the reliability of the circuit and avoid failures caused by inappropriate switching time.

[0031] Energy saving: The power-on circuit with adjustable switching time can reduce energy waste and improve the energy efficiency of the circuit.

[0032] Easy maintenance: The power-on circuit with adjustable on / off time can be easily maintained and adjusted, reducing maintenance costs.

[0033] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the power on / off button circuit of the present invention, and can produce the positive effects recorded in the present invention.

[0034] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention 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 operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0035] Unless otherwise specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A power button circuit, characterized in that: It includes a dedicated chip U1 for power on / off button, a button SW, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, and a third resistor R3. The PB pin of the dedicated chip U1 for power on / off button is electrically connected to one end of the first resistor R1, the other end of the first resistor R1 is respectively electrically connected to one end of the first capacitor C1 and one end of the button SW, the other end of the first capacitor C1 is respectively electrically connected to the other end of the button SW, one end of the second capacitor C2, one end of the third capacitor C3, the GND pin of the dedicated chip U1 for power on / off button, and one end of the fourth capacitor C4, the other end of the second capacitor C2 is electrically connected to the OFFT pin of the dedicated chip U1 for power on / off button, the other end of the third capacitor C3 is electrically connected to the ONT pin of the dedicated chip U1 for power on / off button, the other end of the fourth capacitor C4 is respectively electrically connected to the KILL pin, INT pin, and the third resistor R3 of the dedicated chip U1 for power on / off button, and the EN pin of the dedicated chip U1 for power on / off button is electrically connected to the second resistor R2.

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