KR960009051Y1 - Circuit for input interface - Google Patents

Abstract

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Description

Input interface circuit

1 is a circuit diagram showing the present invention in detail.

* Explanation of symbols for main parts of the drawings

100, 200, 300, 400: noise reduction circuit A ₁ , A ₂ , A ₃ , A ₄ : data input unit

B ₁ , B ₂ , B ₃ , B ₄ : Data output part C ₁ , C ₂ , C ₃ , C ₄ : Coin detection circuit

D ₁ , D ₂ , D ₃ , D ₄ : Block Resistance + V _CC , -V _CC , + V _CC ': Power Line

The present invention relates to a circuit for preventing malfunction due to an input signal, and more particularly, to an input terminal interface circuit for blocking over-input and noise.

In modern times, the use of computers is rapidly increasing due to the electronic age, and application devices using microprocessors are spreading. It is well known that this microprocessor is composed of an integrated circuit which requires very precise operation. The microprocessor is generally referred to as a CPU (central processing unit) or MPU, and is operated based on predetermined software. However, in use of this microprocessor, software and hardware were designed and built according to a predetermined target program.

For example, the microprocessor used in the entertainment game equipment has an arrangement with predetermined hardware, such as its own program ROM, temporary storage RAM, and its own input and output stages and display devices. In other words, it is well known that the entertainment game device allows the microprocessor to control the input / output based on the software of the program ROM, and the detailed description thereof is omitted since this configuration is not related to the present application.

As such, it is well known that an entertainment game device is an application device using a microprocessor, but there is a problem of reliability in users. Because microprocessors are designed to operate on input signals, they often cause malfunctions that operate on analogous external signals. In particular, the external noise generated when using the electronic writer in the entertainment game device caused a malfunction of the game device, which is also pointed out as a problem that occurs in all microprocessor applications. Therefore, if the reliability of the device is improved by reducing the malfunction of the application using the microprocessor, this is a very useful design.

In view of this, an object of the present invention is to provide an input interface interface circuit which blocks over-input and noise of the present invention before being input into a system.

The present invention and the input unit for receiving an external input; A voltage cut-off unit which cuts off an input voltage; A noise removing circuit for removing noise signals from the outside and passing only normal signals; It consists of outputs that apply a normal signal to the system.

The present invention will be described in detail based on the accompanying drawings. The figure relates to an input terminal interface circuit that can be applied to an entertaining game device in which four people can enjoy a game at the same time, and the technology of the present invention is not limited thereto.

Meanwhile, the present invention is a voltage input unit and a data input unit (A ₁ , A ₂ , A ₃ , A ₄ ) configured as a connector such that the left side receives an input signal as shown in the drawing, and the left side is a power input unit configured as a contactor. And data outputs B ₁ , B ₂ , B ₃ , B ₄ .

At the input, the power supply terminal is a ground wire (G), a voltage line of 5 volts and --5 volts connected to the voltage source (+ V _CC ), (-V _CC ) and a line voltage of 12 volts (+ V _CC '). And a capacitor (C ₁ ), an electrolytic capacitor (C ₂ ) and (C ₃ ) and a diode (D ₁ ) are connected in parallel between the ground wire (G) and the power supply line (+ V _CC ). Electrolytic capacitors (C ₄ ) and (C ₅ ) are also connected between (-V _CC ) and (+ V _CC ) between ground (G). In addition, the coils L ₁ , L ₂ , and L ₃ are individually connected to the power lines + V _CC , -V _CC , and (+ V _CC ') in series. These capacitors and coils not only separate the input power from ground but also smooth it. These power sources are applied to the output section on the same line. In addition, since the fuse (F) is installed on the ground line (G) to protect the system against overvoltage input.

Lines of left and right speakers SPL1 and SPL ₁ and left and right speakers SPL ₂ and SPR ₂ which are paired with speaker power sources SPL + and SPL- are connected to the output unit. In addition, a terminal for data is formed in the input unit, and four groups of data input units A ₁ , A ₂ , A ₃ , and A ₄ are formed in order to enjoy a game of _four players. Among them, the data input unit A ₁ is selected and described, and the terminal P ₁ receives a signal indicating an operation display for initializing the system. The terminal S is supplied with a signal for commanding the start of the game. Terminals (U), (D), (L), (R) and pads (P ₁ ), (P ₂ ), (P ₃ ) and (P ₄ ) command the up, down, left, and right movements with the control keys of the game program. In addition, a signal indicating a special command is applied. Similarly, the data input units A ₂ (A ₃ ) and (A ₄ ) have the same function.

Data signals input from the data input unit A ₁ are input to the noise removing circuit 100. This noise removing circuit 100 is input to another noise removing circuit 100. The noise removing circuit 100 has the same configuration as the other noise removing circuits 200, 300 and 400, and is composed of paired porter coupler groups 30 and 40. FIG.

The photocoupler groups 30 and 40 are each composed of five photocouplers, and are turned on and off with respect to input data signals. At this time, if the input data is noise or unnecessary signal, it can be seen that each photocoupler is not operated and as a result, the noise to the system is removed. These photocouplers are individually provided with a resistor of the block resistor D ₁ and a capacitor.

Particularly, with respect to the coin input signal terminal P ₁ , the capacitor C ₆ , the diode D ₂ , and the zener diode ZD are applied so that the normal signal of the power source according to coin detection is applied to the corresponding terminal of the photocoupler group 30. ₁ ) is made via the circuit C ₁ connected in parallel.

The coin detection circuit C ₁ functions to prevent input of an unnecessary signal input to the ground of the coin mechanism.

Then, the signal via the noise canceling circuit 100 composed of the photocoupler groups 30 and 40 is applied to the data output portion B ₁ so that these signals are supplied to the system. Signals from the other data inputs (A ₂ ), (A ₃ ) and (A ₄ ) are passed through the noise canceling circuits 200, 300, and 400, respectively, while the normal signal is output (B ₂ ), ( Outputs B ₃ ) and (B ₄ ) to feed the system.

As described above, the present invention eliminates overvoltage input or unnecessary signals that can be directly applied to the system, thereby improving reliability of an application using a microprocessor.

Claims (1)

In the input terminal interface circuit composed of an input unit and an output unit composed of a connector, the ground lines are separated by a capacitor and a diode at a plurality of power stages, and the signals input to the data input unit are passed through each photo coupler forming a photocoupler group. An input interface circuit that allows only normal signals to be supplied to the system via the data output.