CN210864631U

CN210864631U - Practical panel computer keyboard inserts detection switch circuit

Info

Publication number: CN210864631U
Application number: CN201921975027.7U
Authority: CN
Inventors: 高观燊
Original assignee: Hefei Bitland Information Technology Co ltd
Current assignee: Wuhan baolongda Information Technology Co.,Ltd.
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-06-26
Anticipated expiration: 2029-11-14

Abstract

The utility model provides a practical panel computer keyboard inserts and detects switch circuit, include: the keyboard comprises a keyboard connector, a switching tube, a transistor, a first power supply terminal, a second power supply terminal and a controller; a monitoring pin is reserved on the keyboard connector, and when the keyboard is in adaptive connection with the keyboard connector, the monitoring pin is short-circuited to the ground; the grid of the transistor is connected with the monitoring pin in an equipotential manner and is connected with the second power supply terminal; a source of the transistor is grounded, and a drain of the transistor is connected with the first power supply terminal; the controller is respectively connected with the drain electrode of the transistor and the control end of the switch tube and is used for controlling the on-off of the switch tube according to the potential signal of the drain electrode of the transistor. The utility model discloses be applied to behind the panel computer, during the external keyboard of panel computer, the host computer end need be listened the keyboard and just supply power for the keyboard after correctly inserting, can save mainboard end consumption, can effectively prevent again that the keyboard from anti-inserting to lead to equipment to damage.

Description

Practical panel computer keyboard inserts detection switch circuit

Technical Field

The utility model relates to the technical field of circuits, especially, relate to a practical panel computer keyboard inserts detection switch circuit.

Background

The keyboard is an indispensable accessory of the computer. The tablet personal computer is widely used as a portable computer. In order to further ensure the convenience of the tablet personal computer, a keyboard interface is reserved for many tablet personal computers. According to the conventional tablet personal computer, whether a keyboard is inserted or not is judged at the mainboard end, a power supply path of the keyboard is normally opened, so that energy is wasted, and equipment is damaged due to abnormal conditions such as reverse insertion of the keyboard.

SUMMERY OF THE UTILITY MODEL

Based on the technical problem that the background art exists, the utility model provides a practical panel computer keyboard inserts and detects switch circuit.

The utility model provides a pair of practical panel computer keyboard inserts and listens switch circuit, include: the keyboard comprises a keyboard connector, a switching tube, a transistor, a first power supply terminal, a second power supply terminal and a controller;

the second power supply terminal is connected with the keyboard connector through the switch tube, and the second power supply terminal supplies power to the keyboard connector in the conducting state of the switch tube;

a monitoring pin is reserved on the keyboard connector, and when the keyboard is in adaptive connection with the keyboard connector, the monitoring pin is short-circuited to the ground; the grid of the transistor is connected with the monitoring pin in an equipotential manner and is connected with the second power supply terminal;

a source of the transistor is grounded, and a drain of the transistor is connected with the first power supply terminal; the controller is respectively connected with the drain electrode of the transistor and the control end of the switch tube and is used for controlling the on-off of the switch tube according to the potential signal of the drain electrode of the transistor.

Preferably, a first resistor is connected in series between the gate of the transistor and the second power supply terminal.

Preferably, the second power supply terminal is also grounded through the first capacitor.

Preferably, a second resistor is connected in series between the controller and the control end of the switching tube.

Preferably, the second power supply terminal is connected to the input terminal of the switching tube, and the output terminal of the switching tube is grounded through the second capacitor and connected to the keyboard connector through the third resistor.

Preferably, a fourth resistor is connected in series between the drain of the transistor and the first power supply terminal.

The utility model provides a pair of practical panel computer keyboard inserts detection switch circuit, is applied to the panel computer after, and during the external keyboard of panel computer, the host computer end need be listened the keyboard and just supply power for the keyboard after correctly inserting, can save mainboard end consumption, can effectively prevent again that the keyboard from anti-inserting and leading to equipment to damage.

Drawings

Fig. 1 is a schematic diagram of a practical circuit for inserting a detecting switch into a tablet computer keyboard according to the present invention.

Detailed Description

Referring to fig. 1, the utility model provides a practical panel computer keyboard inserts and listens switch circuit, include: the keyboard comprises a keyboard connector J1, a switch tube U1, a transistor Q1, a first power supply terminal VCC1, a second power supply terminal VCC2 and a controller.

The second power supply terminal VCC2 is connected to the keyboard connector J1 through the switch tube U1, and when the switch tube U1 is in a conducting state, the second power supply terminal VCC2 supplies power to the keyboard connector J1. Therefore, the keyboard connector J1 can be controlled to be electrified or not by controlling the on-off of the switch tube U1, namely whether power is supplied to a keyboard inserted into the keyboard connector J1 or not is controlled.

A monitoring pin is reserved on the keyboard connector J1, and when the keyboard is connected with the keyboard connector J1 in a matching mode, the monitoring pin is short-circuited to the ground. That is, when the keyboard connector J1 is connected in the air or the keyboard is connected in the reverse direction, the monitor pin is floating or the level is pulled high. In this way, in the present embodiment, whether the keyboard is correctly connected to the keyboard connector J1 can be monitored by monitoring the level signal GND _ DET of the monitor pin.

The gate of the transistor Q1 is equipotentially connected to the monitor pin and is connected to the second power supply terminal VCC 2.

The source of the transistor Q1 is grounded, and the drain thereof is connected to the first power supply terminal. The controller is respectively connected with the drain of the transistor Q1 and the control end of the switch tube U1, and is used for generating a control signal Key _ DET _ SOC according to the potential signal Key _ DET of the drain of the transistor Q1 to control the on-off of the switch tube U1.

Specifically, in the present embodiment, when the transistor Q1 is an N-channel transistor, the transistor Q1 is turned off when the level signal GND _ DET is made low; at this time, the controller controls the switch tube U1 to be turned on when the potential signal Key _ DET is at a high level, so that the second power supply terminal VCC2 supplies power to the keyboard. As shown in particular in figure 1. When the Key _ DET signal is at a high level, and then the Key _ DET _ SOC sends out a high level, the switch tube U1 is turned on, the switch tube U1 is turned on, and the keyboard connector J1 obtains a working voltage.

When the transistor Q1 employs a P-channel type transistor, the transistor Q1 is turned on when the level signal GND _ DET is implemented as a low level; at this time, the controller controls the switch tube U1 to be turned on when the potential signal Key _ DET is at a low level, so that the second power supply terminal VCC2 supplies power to the keyboard.

In this embodiment, a first resistor R1 is connected in series between the gate of the transistor Q1 and the second power supply terminal VCC2 to perform voltage division and current limitation.

In this embodiment, the second power supply terminal is also grounded via the first capacitor C1 for dc isolation protection. Similarly, the output terminal of the switching tube U1 is grounded through the second capacitor C2. Meanwhile, the second power supply terminal VCC2 is connected to the input terminal of the switch tube U1, and the output terminal of the switch tube U1 is connected to the keyboard connector J1 through the third resistor R3.

In this embodiment, a second resistor R2 is connected in series between the controller and the control end of the switching tube U1, and a fourth resistor R4 is connected in series between the drain of the transistor Q1 and the first power supply terminal VCC1, so as to divide the voltage.

The above description is only the specific implementation of the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can be in the technical scope of the present invention, and according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a practical panel computer keyboard inserts detects switch circuit which characterized in that includes: the keyboard comprises a keyboard connector (J1), a switch tube (U1), a transistor (Q1), a first power supply terminal (VCC1), a second power supply terminal (VCC2) and a controller;

the second power supply terminal (VCC2) is connected with the keyboard connector (J1) through the switch tube (U1), and the second power supply terminal (VCC2) supplies power to the keyboard connector (J1) when the switch tube (U1) is in a conducting state;

a monitoring pin is reserved on the keyboard connector (J1), and when the keyboard is in adaptive connection with the keyboard connector (J1), the monitoring pin is short-circuited to the ground; the grid of the transistor (Q1) is connected with the monitoring pin in an equipotential manner and is connected with the second power supply terminal (VCC 2);

a transistor (Q1) having a source grounded and a drain connected to the first power supply terminal; the controller is respectively connected with the drain electrode of the transistor (Q1) and the control end of the switch tube (U1) and is used for controlling the switch tube (U1) to be switched on and off according to a potential signal of the drain electrode of the transistor (Q1).

2. The practical tablet keyboard insertion detection switch circuit of claim 1, wherein a first resistor (R1) is connected in series between the gate of the transistor (Q1) and the second power supply terminal (VCC 2).

3. The utility tablet keyboard insertion detection switch circuit of claim 1, wherein the second power supply terminal is further grounded through a first capacitor (C1).

4. The practical tablet computer keyboard insertion detection switch circuit as claimed in claim 1, wherein a second resistor (R2) is connected in series between the controller and the control terminal of the switch tube (U1).

5. The keyboard insertion detection switch circuit of claim 4, wherein the second power supply terminal (VCC2) is connected to the input terminal of the switch tube (U1), and the output terminal of the switch tube (U1) is connected to ground via the second capacitor (C2) and to the keyboard connector (J1) via the third resistor (R3).

6. The keyboard insertion detection switch circuit of any one of claims 1 to 5, wherein a fourth resistor (R4) is connected in series between the drain of the transistor (Q1) and the first power supply terminal (VCC 1).