KR200208541Y1 - PC power switch and KEY LOCK common device - Google Patents

Abstract

The present invention uses the key switch to separate the PC's power switch and the key lock device so that the key switch can be used to control the lock / unlock (lock / unlock) and the on / off of the power switch. It relates to a power switch and a key lock interface of a PC.

Conventional PCs are equipped with key locks to prevent other users from using your PCs, so that key codes cannot be entered, and a power on / off switch is separately installed to protect your PC. There is a problem that loopholes are exposed.

The present invention prevents the keyboard key input as the key of the key lock so that the power switch and the key lock device separated from the user's PC can be controlled using a single switch. To simplify the PC security of individual users.

Description

PC power switch and KEY LOCK common device

The present invention prevents the input of the keyboard by using the key lock switch and the key lock and the power switch of the PC are separated, the power switch of the PC to control the power on / off using a single switch and It relates to a key lock interface.

1 is a configuration of a key lock device of a conventional PC, and includes a key switch 1 for controlling the use of a key board and a lock / unlock signal connected by the key switch 1; By the connection part 2 applied to (3), the keyboard control part 3 which controls the use of the keyboard 4 by the signal applied by the said connection part 2, and the keyboard control part 3, It consists of a keyboard 4 which is controlled to input keys.

Reference numeral R1 is a resistor.

Referring to FIG. 1, a lock device of a conventional PC is configured as described above.

When the user puts the key of the key switch 1 in the locked position to prevent the keyboard input, the connection part 2 is connected to the ground terminal according to the locked position, so that the keyboard control part 3 is connected to the keyboard 4. ) Will be prevented.

When the key of the key switch 1 is in the unlocked position for use by the user, the connection unit 2 applies the unlock signal to the input terminal P1 of the keyboard control unit 3, and thus, the keyboard control unit 3 The key of the keyboard 4 enables input.

2 is a configuration of a power on / off switch of a conventional PC, the power switch 5 that is turned on / off to the user, and the power supply unit 6 for controlling the power supply in accordance with the on / off of the power switch (1) And a power connector 7 for applying power required for each part of the system by the power supply unit 6.

As shown in FIG. 2, when the power switch 5 is turned off, the power supply unit 6 supplies power required by the power connector 7 as shown in FIG. 2. No power is supplied to each part of the system.

When the power switch 5 is turned on, the power supply unit 6 supplies the power required by the system through the connector 7.

In the conventional PC, since the key lock switch of FIG. 1 and the power switch of FIG. 2 are separately configured, the user may not only be inconvenient but also have a problem in terms of security when the user leaves the seat without locking the key lock device. Will be.

In order to solve the above problems, the present invention allows the key lock control to be performed while the key lock switch is used so that the power lock and the key lock switch of the PC can be shared as a single switch. By simplifying the switch, you can keep your PC completely secure by disabling your PC.

1 is a view for showing a key lock device of a conventional PC

2 is a view for showing a power switch of a conventional PC

Figure 3 is a block diagram of the power switch and key lock common device of the present invention PC

Figure 4 is an embodiment of the present invention, a detailed circuit configuration of the power switch and key lock common device

The configuration of the power switch and the key lock common device of the present invention will be described with reference to FIGS. 3 to 4 as follows.

A key lock switch 11 for locking and unlocking a key, a key lock and power control unit 12 for controlling key lock and power according to internal logic by the key lock switch 11, and the key lock And a power supply unit 13 for supplying power required to each unit of the PC according to the power control signal of the power control unit 12, and a keyboard according to the keyboard control signal of the key lock and the power control unit 12. A keyboard controller 14 for controlling 15) and a keyboard 15 controlled by the keyboard controller,

4 is an embodiment of the present invention, wherein the power and key lock control unit 12 is a connection unit 121 for applying a signal according to the operation state of the key lock switch 11 and the signal input from the connection unit 121 Is applied to the clock signal CLK of the flip-flop 124 with a delay of a predetermined time, and the clock signal CLK and the free ( The flip-flop 124 for logic processing according to the state input to the stage and outputs through the output terminal (Q), and on / off in accordance with the output (Q) state of the flip-flop 124 to the power supply unit 13 of the The transistor Q1 outputs to the READY stage, the POWERGOOD stage of the power supply unit 13 and the state of the key lock switch to perform logic processing to flip the flip-flop 124. And a logic unit 125 that outputs to the keyboard control unit 18.

Reference numerals R1-R6 are resistors, and Vcc is always supplied power.

Referring to Figures 3 to 5 with respect to the common device of the key lock and power switch of the subject innovation PC configured as described above are as follows.

Referring first to Figure 3,

When the user wants to turn on or off the power by using the lock and unlock operation of the key lock switch 11, four operation states are controlled when the user wants to lock or unlock the keyboard. .

The key lock and power control unit 12 recognizes the key lock switch 11 according to the operation state of the key lock switch 11, and applies a control signal for lock and unlock to the keyboard control unit 14 using the recognized signal. Thereby controlling the use of the keyboard 15.

In addition, the key lock and power control unit 12 applies a power control signal to the power supply unit 13 according to the operation state of the key lock switch 11 to supply and cut off the power of the system.

4 is an embodiment of the present invention, the operation of the key lock and the power control unit 12 according to the operation state of the key lock switch 11 is as follows.

When the power is turned on using the key lock switch 11;

The key lock switch 11 is opened in the "A" state and shorted in the "B" state.

When the key lock switch 11 moves from the "A" state to the "B" state and then returns to the "A" state, the key lock switch 11 is opened, shorted, or opened in the connection part 12 with a signal according to the state, and then a constant signal ( b ') is applied to one input of the logic unit 125 and is applied to the clock terminal CLK of the flip-flop 124 as a delayed signal through the buffers 122 and 123.

At this time, the state of the flip-flop 124 by the power supply (Vcc) as shown in Table 1 Stage is high (H), The output signal Q is output to the high H state by the rising edge ↑ of the clock signal CLK applied through the buffer 123 while the high H state is.

input Print CLK D Q H H ↑ H H L

Here, the D stage of the flip-flop 124 is in the low (L) state because it is linked with the high (H) or inverted output ().

When the output signal Q of the flip-flop 124 is applied to the base of the transistor Q1 in a high state, the transistor Q1 switches to the READY terminal of the power supply 13 connected to the collector. .

The READY stage of the power supply unit 13 is in a high (H) state in a normal state and is triggered by a falling edge (↓) by the output signal of the transistor Q1 for turning on the power.

When the power supply unit 13 is turned on, the driving power is supplied to the system. When the voltage is at a certain level, the POWERGOOD terminal becomes high (H) and is applied as a type force of the logic unit 125.

When the logic unit 125 receives the signal b 'applied from the connection unit 121 and the high signal H from the power supply unit 13 and performs logic processing to output the high signal H, the logic unit 125 outputs the high signal H. The high output is flip-flop 124 However, it is applied as a control input of the keyboard control unit 14.

By the high signal, the keyboard controller 14 enables the keyboard to be used. Since the flip-flop 124 has the output Q high, The high signal applied to the stage does not affect the flip-flop 124;

And, if you want to lock the keyboard with the key lock switch (11);

When the key lock switch 11 is set to the "B" state while the power is supplied to the key lock and the power control unit 12, the input signal is shorted at the connection unit 121, and the short signal The constant signal b 'is applied to one side input of the buffer 122 and the logic unit 125.

At this time, the constant signal b 'caused by the short signal and the high signal of the POWERGOOD terminal of the power supply unit 13 are logically processed by the logic unit 125 to output the low signal L.

Then, the flip-flop 124 by the low output of the logic unit 125 However, even if the low signal is applied, the output Q of the flip-flop 124 is still high as shown in Table 2, and thus does not affect the power supply unit 13, but only by the low signal of the logic unit 125. The keyboard is applied to the keyboard control unit 14 as a keyboard lock signal to lock the keyboard.

input Print CLK D Q L H × × H L

* ×; Don't care

Here, the buffers 122 and 123 delay the signal applied to the clock terminal CLK of the flip-flop 124, so that the flip-flop 124 It is possible to prevent the power supply from being turned off by the clock signal CLK before the signal applied to the stage falls to the low level L;

And when the key lock switch 11 wants to unlock the keyboard;

When the key lock switch 11 is returned from the "B" state to the "A" state, the connection part 121 of the key lock and the power supply control unit 12 receives the constant signal b 'by the open buffer 122. ) And the logic unit 125.

The output signal of the logic unit 125 becomes a high signal H by performing logic processing on the constant signal b 'caused by the opening and the signal applied from the power supply unit 13.

The high signal of the logic unit 125 is the flip-flop 124 of the The stage is made high and the keyboard is made a high signal to unlock the keyboard to enable the use of the keyboard.

Here, the high signal of the logic unit 125, as shown in the state of the flip-flop 124 shown in Table 3, the output terminal (Q) and inverted output terminal ( ) Is the full state (Q ₀ = H, }

= L), so it will not affect the power supply.

input Print CLK D Q H H L × Q ₀ }

* Q ₀ ; Stay state

* Maintain state;

Then, when the power is to be turned off using the key lock switch 11;

When the key lock switch 11 is turned on in the same manner as when the power is turned on, the output of the flip-flop 124 is outputted as a low signal L when the transistor returns from the "A" state to the "B" state and then returns to the "A" state. The READY stage of the power supply unit 13 connected to the collector of Q1 is triggered to power off and the power is turned off.

In another embodiment, the two-stage switch may be configured as a three-stage switch to simplify power on / off and key lock. In other words, power on / off with a three-stage switch shorts pins 1 and 2, and key lock is used by shorting pins 2 and 3.

The present invention is designed to control the locking and unlocking of the keyboard while the power is turned on / off by using the key lock switch of the PC, so that if the power switch is not keyed, the PC cannot be used as a server used as a server. In addition to maintaining the security of the user's PC, it also has the effect of reducing the cost of simplifying the switch.

Claims (2)

A key lock switch for controlling power and a keyboard according to a user's option; A key lock and power control unit comprising a connection unit, a delay unit, a gate unit, a switching unit, and a logic unit for controlling a power supply and a keyboard according to the key state of the key lock switch unit; A power supply unit that is turned on / off by the key lock and a power control signal of a power control unit to supply and cut power; A keyboard controller for controlling a keyboard controlled by a combination of a signal of the power supply unit and a signal of the connection unit; PC is configured to control the operation according to the control signal of the keyboard control unit to turn on / off the power of the PC system, PC to lock (LOCK) / unlock (UNLOCK) the use of the keyboard Power switch and KEY LOCK interface. 2. The key lock and the power control unit of claim 1, wherein the key lock and the power control unit include a connection unit comprising a power supply and a ground for applying a signal according to the state of the key lock switch, and a delay unit configured to delay a signal applied from the connection unit by a predetermined time. And a gate part consisting of a flip-flop which is logic processed by the delayed signal through the delay part and a signal applied to the free end and outputs through the output terminal Q, and is turned on / off by a signal output from the gate part. A keyboard control unit comprising a switching unit comprising a transistor Q1 output to a power supply unit, a signal obtained by combining the signal through the connection unit and the signal of the POWERGOOD stage of the power supply unit, and combining the signal with the free end of the gate unit. It consists of a logic unit for inputting to the PC power on / off the keyboard to lock / unlock (UNLOCK) Key and the power switch of the PC (PC) key lock (KEY LOCK) public device.