KR100311805B1 - Output unit with three output states - Google Patents

Abstract

PURPOSE: Provided is an output unit with three output states which connects a detection circuit and an output side by a photo-coupler to prevents noise due to external electronic wave from being permitted to the detection circuit so that it prevents malfunction of the detection circuit by noise. CONSTITUTION: In the output unit with three output states which permits an output signal in multiple subsidiary devices with sensing function to a main device with control function, the output unit with three output states comprises the parts of: multiple switching tools which are connected to a first power line in serial to turn on in generating a detection signal from the subsidiary devices; a photo-coupler which consists of an LED and a photo-transistor which connects with a collector through a resistor and switches by a light signal permitted to the LED; and an output device part which generates three different kinds of output signal by on/off in the photo transistor.

Description

Output device with 3 output status

The present invention relates to a sensing device that detects gas, intruder, and the like, and relates to an output device having three output states that are strong against external noise and can accurately transmit a detection result of a sensor.

In general, the security system is a system for security or security that protects the home from dangers such as external invasion or gas leakage, and the schematic configuration is shown in FIG. For example, in the case of a security system provided in a house, the signal from each sensing device installed in the house and connected wirelessly or wired is determined to determine security / expense status and transmitted to a wireless signal security company or police station. Is provided with a monitoring circuit system 11, and is connected to the monitoring circuit system 11 by wire or wireless to detect the specific state, such as gas leakage or intruder or window break, respectively, to the monitoring circuit system 11 It consists of a plurality of sensing units 12, 13, 14 to output. The plurality of sensing units 12, 13, and 14 may detect a specific state by receiving power from the power supply unit 15, which supplies power for a sensing operation, and the power supply unit 15, as shown in FIG. 2 (b). A sensor sensing unit 16 comprising a sensing element, a sensing signal processing unit 17 processing a signal output from the sensor sensing unit 16, and a signal input from the sensing signal processing unit 17. And an output unit 18 for outputting to the lecture circuit system. However, the conventional sensing device simply outputs a signal output, for example, in a sensing state of logic "1" and a normal state of logic "0". The sensing state is a state in which a mark signal of about 5V is applied, When the normal state is output in the space state of about 0V, the sensing signal system, which is the main controller, does not know when the power supply dies and the sensing device does not operate.In addition, external noise caused by strong electromagnetic waves is applied from the output side to the sensing side, There was a problem that the operation becomes unstable.

The present invention has been made to solve the above-mentioned conventional problems, the object of which is to separate the sensing circuit of the sensing device from the application of external noise, the signal output is a power off state, the detection signal application state, three steps to the normal state The present invention provides an output device having a three output state that is strong in external noise and can identify a fault condition.

Figure 1a is a block diagram showing the configuration of a schematic security system.

FIG. 1B is a block diagram illustrating a schematic configuration of the sensing unit provided in FIG. 1A.

2 is a circuit diagram showing an embodiment of an output device according to the present invention.

* Explanation of symbols for main parts of the drawings

21, 22: first and second switching unit 23: photo coupler

PD: Light emitting diode Q1: Light receiving element

Q2 to Q3: transistor ZD1, ZD2: zener diode

V: Varistor C1, C2: Condenser

R1 to R3: resistance

The present invention is a technical means for solving the above problems, in the output device having a three output state for outputting the output signal of the secondary device to the main device in three output states,

A plurality of switching means which are provided in series on a first power supply line and operate on / off switching in accordance with an output signal from the auxiliary device;

A photocoupler comprising a light emitting diode provided in series with the first power supply line and a light receiving transistor connected in series with a second power supply for switching by an optical signal applied from the light emitting diode;

And an output device for adjusting the output signal level to multiple levels by turning on / off the light receiving transistor of the photocoupler.

2 is a circuit diagram showing an embodiment of an output device according to the present invention, the first switch of which one end is connected to the first power source (Ycc1) to switch on / off according to the input of the first detection signal (IN1). 21 and a second switching unit 22 having one end connected to the other end of the first switching unit 21 and the other end connected to the ground to perform on / off switching operation according to the second detection signal IN2. The collector is connected to the light emitting diode PD and the second power supply Vcc2 provided between the first switching unit 21 and the second switching unit 22 through a resistor R1 and is grounded by an emitter. A photocoupler 23 made up of a transistor Q1 that receives an optical signal from the light emitting diode PD and operates on / off, and a base thereof is connected to a collector of the transistor Q1, and an emitter connects the capacitor C2. The collector is connected to the transistor Q2 grounded through the second power source Vcc2 and the resistor R2 A transistor (Q3) connected to a base through its emitter and base by a capacitor (C1), and an emitter end connected to an output terminal (OUT) through a resistor (R3), and a base of the transistor (Q3); Connected in series between grounds, the contact has two zener diodes ZD1 and ZD2 connected to the emitter of the other transistor Q2, the emitter of the transistor 02 being grounded and also the It is configured to be connected to the output terminal (OUT) by V).

In FIG. 2, one switching unit may be provided when there is one input sensing signal, and a plurality of switching units may be provided when two or more sensing signals are provided. In the present example, the first and second sensing signals are applied to be output in three states. The operation is as follows.

The first and second switching units 21 and 22 may switch on and off by the first and second sensing signals IN1 and IN2, respectively. The first and second sensing signals IN1 and IN2 may be sensing circuits ( It is a signal output from the figure, and is generated by detecting a change in a specific state.

That is, when both of the first and second sensing signals are applied, the first and second switching units 21 and 22 are both conducting and the first power source Vcc1 is applied to the light emitting diode PD so that a current flows. Therefore, the light emitting diode PD operates to output an optical signal. The optical signal generated from the light emitting diode PD is received at the base of the transistor Q1, so that the transistor Q1 is turned on.

Since the base of the transistor Q2 connected to the collector by the conduction of the transistor Q1 is connected to the ground, the base-emitter voltage Vbe of the transistor Q2 is about 0.7 V or less, so that the transistor Q2 ) Is off. In addition, the transistor Q3 maintains the conduction state at all times by supplying a power supply voltage to the base through the resistor R2. The transistor Q3 is turned on by the two control diodes ZD1 and ZD2 by turning off the transistor Q2. ) Is grounded, so that the output voltage OUT is the voltage across the two control diodes ZD1 and ZD2 between the emitter of the transistor Q3 and ground. Here, when the two zener diodes ZD1 and ZD2 are 6V constant voltage devices, the output voltages when the sensing signals IN1 and IN2 are applied are 12V in total.

In addition, either signal of the two sensing signals IN1 and IN2 is not applied, and either the switching unit 21 or 22 or the two switching units 21 and 22 of the two switching units 21 and 22 are both blocked. Therefore, the power source Ycc1 is not applied to the light emitting diode PD provided therebetween. As a result, the light emitting diode PD does not operate, and the transistor Q1, which is a light receiving element, is also cut off. Therefore, the second power source Vcc2 is applied to the base of the transistor Q2 through the resistor R1, and the transistor Q2 is conducted. As a result, one zener diode ZD1 is grounded through the conducting transistor 02.

The transistor Q3 is always supplied with a second power source Vcc2 to its base by the resistor R2, and is always in a conductive state. The base is connected to the zener diode ZD1 by the turn-on of the transistor Q2. It is connected to ground through transistor Q2. Therefore, the voltage between the emitter of the transistor Q3 and the ground is small enough that the output signal OUT is negligible between the two conducting transistors Q2 and Q3, so that one control diode ZD1 A voltage is output. For example, in the case of a 6V constant voltage zener diode, a signal of about 6V voltage is output. That is, if there is no detection signal, a signal of about 6V is output.

As such, a signal of about 12V is output in a state where a detection signal is applied, and a signal of about 6V is output in a normal state where a detection signal is not applied, and thus it is possible to determine whether there is sensing, and about 6V in a normal state. Since the signal of the voltage is output, when the circuit is not operated due to the failure of the sensing device or the power cutoff, that is, the case where the 0 V signal is output, the failure of the sensing unit can be determined.

In addition, the device according to the present invention may be provided on the output side of various devices in which the output state is divided into an inactive state and an active state as well as a sensing device.

As described above, the present invention outputs the output signals in the normal state and the sensed state at the predetermined voltage state so as to be distinguished from the output signal of the 0V voltage appearing at the time of circuit failure, and there is a failure of the sensing device in the main system. It has the effect of checking the, and also, by connecting the sensing circuit side and the output side to the photocoupler to prevent noise caused by external electromagnetic waves from being applied to the sensing circuit, it has an excellent effect of preventing the sensing circuit from malfunctioning by the noise. .

Claims (2)

In an output device having a three output state for applying the output signal of the plurality of sub-devices having a sensing function to the three output state to the main device having a control function, A plurality of switching means provided in series on a first power line and turning on when a detection signal is output from the auxiliary device; A photocoupler comprising a light emitting diode provided in series with the first power supply line, an emitter-grounded light receiving transistor connected to a collector through a resistor to a second power supply, and switched by an optical signal applied from the light emitting diode; , And an output device for outputting three different levels of output signals by on / off of the light receiving transistor of the photocoupler. The method of claim 1, wherein the output device unit To the collector of the light receiving transistor connected in series with the second power line An emitter grounded first switching transistor to which the base is connected; A second switching transistor connected to the second power source, the collector connected to the base through a resistor, and the collector connected to an output terminal through a resistor; Two zener diodes connected in series between a base of the second switching transistor and a ground, and a contact thereof connected to a collector of the first switching transistor; A varistor provided between the output terminal and the ground, Output device having a three output state, characterized in that consisting of a plurality of resistors and capacitors provided between each element.