KR100862116B1 - fire detector circuit - Google Patents

Abstract

The present invention relates to a differential or constant temperature fire detector for detecting changes in heat and a photoelectric or ionized smoke detector for detecting changes in concentration of smoke.

The fire detector circuit according to the present invention includes a rectifier 10 for rectifying power supplied from the outside, a constant voltage setting unit 20 for converting the power rectified through the rectifier 10 into a constant voltage power source, and the constant voltage setting unit The transmitter 40 is provided with a light emitting device (IRED) for emitting power by receiving power from the (20), and the light receiving device (CELL) is driven by sensing the light emitted from the transmitter 40 when smoke occurs In the smoke-type fire detector circuit comprising a light receiving unit 50 and the SCR driver 60 for generating a fire detection signal according to the driving of the light receiving unit 50, the constant voltage setting unit 20 and the light transmitting unit Bias resistors R43 and R44 are connected between the base and the collector, the collector is connected to the light emitting element IRD of the transmitter, and the emitter is connected to the ground. Still life by When a high voltage greater than the constant voltage set through the voltage setting unit 20 is introduced, a bias voltage is applied to the base of the transistor Q47 through the bias resistors R43 and R44 to drive the light emitting device IRD of the light transmitting unit 40. It is characterized in that the malfunction prevention unit 30 to cut off the power supplied to.

Transistor, resistor, light emitting element (IRED), capacitor, light receiving element (CELL)

Description

Fire detector circuit

1 is an external perspective view of a conventional fire detector,

2 is a conventional smoke detector circuit diagram,

3 is a conventional differential or constant temperature fire detector circuit diagram,

4 is a smoke type smoke detector circuit diagram according to an embodiment of the present invention;

5 is a smoke-type fire detector circuit diagram according to another embodiment of the present invention;

6 is a differential or constant temperature fire detector circuit diagram according to another embodiment of the present invention.

※ Explanation of code for main part of drawing

10: rectifier 20: constant voltage setting unit

30: malfunction prevention part 40: transmission part

50: light receiver 60: SCR driver

IRED: Light emitting element CELL: Light receiving element

TNR: Surge Observer SCR: Thyristor

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

delete

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector circuit, and more particularly to a differential or constant temperature fire detector for detecting a change in heat and a photoelectric or ionized smoke detector for detecting a change in concentration of smoke.

1 is an external perspective view of a conventional fire detector, which includes a detector detecting a fire and an electronic circuit unit converting a temperature or smoke concentration detected by the detector into a predetermined signal.

Since the present invention relates to the electronic circuit of the fire detector, there is no significant relationship with respect to the detection unit of the fire detector, so a detailed description thereof will be omitted.

Figure 2 shows a circuit diagram of a conventional smoke detector.

When a power source having a DC 24V voltage is input to the input terminal, the input power source is rectified through the bridge diodes D1, D2, D3, and D4 so that only + power is always applied regardless of polarity. Thereafter, the AC power included in the DC power supply is attenuated by the capacitor C3, and then a constant voltage power supply having a constant voltage is supplied through the constant voltage circuit composed of the resistor R1, the transistor Q1, and the zener diode D5. Is approved.

The power converted to the constant voltage through the constant voltage circuit is supplied to the capacitor C4 through the resistors R2 and R5 to charge the capacitor C4, and after the capacitor C4 is charged, the transistor Q2 The bias voltages of the resistors R3 and R4 are applied to the base to operate the transistor Q2. When the transistor Q2 is operated, the bias power is supplied to the base of the transistor Q3 to operate the transistor Q3. In response to the operation of the transistor Q3, the light emitting element ILD1 is operated to emit light.
Since the light receiving device CELL1 is located away from the normal transmission path of the light emitted from the light emitting device ILD1, the light is not input to the light receiving device CELL1 even when the light emitting device ILD1 emits light. However, when smoke is generated by a fire or the like, since light is refracted by the smoke, the light emitted from the light emitting element ILD1 is input to the light receiving element CELL1, and when light is input to the light receiving element CELL1, the capacitor ( The voltage is applied to the base of the transistor Q5 through C9, the transistor Q5 is driven, and the emitter and the collector are in the SHORT state, and the low voltage is applied to the base of the transistor Q6. Accordingly, when the transistor Q6 operates and the transistor Q6 operates, a voltage passing through the resistors R8 and R10 is applied to the base of the transistor Q7 through the capacitor C10 to operate the transistor Q7. . In this case, the voltage passing through the transistor Q6 may be adjusted through the variable resistor R13.

On the other hand, when the transistor Q2 is driven, a bias voltage is applied to the base of the transistor Q4 to drive the transistor Q4, and according to the operation of the light receiving element CELL1, a voltage applied to the base of the transistor Q7 is applied. The transistor Q7 is operated by this. When the transistor Q7 is driven, the emitter and the collector of the transistor Q7 are in the SHORT state, and the LOW voltage is applied to the emitter. As a result, a low voltage is applied to the base of the transistor Q8 to operate the transistor Q8, and as the emitter and the collector of the transistor Q8 enter the SHORT state, the operating power supply voltage passes through the collector to the light emitting diode LED1. It is supplied and turned on. In addition, since the voltage is applied to the base of the transistor Q9 according to the driving of the transistor Q8, the emitter and the collector of the transistor Q9 are put in the SHORT state, so that the base of the transistor Q8 always has a low voltage. As a result, the light emitting diode LED1 is continuously maintained.

3 is a circuit diagram of a conventional differential or constant temperature fire detector.

When the detector power supplied from the external receiver is introduced through A and B, the bridge rectifier composed of a plurality of diodes D31, D32, D33, and D34 has a nonpolar power in the connection direction.

When the external detector operates, the sensing contact point P contacts, and the detector power is applied to the SCR gate through the resistor R31, so that the SCR is operated to light up the light emitting diode L31.
However, in the case of a conventional smoke detector or a circuit of a differential or constant temperature fire detector having the above configuration, when electromagnetic waves, surges, static electricity, etc. are generated from the surroundings, the generated voltage flows into the circuit and malfunctions. There was a risk of misunderstanding due to fire.

Accordingly, the present invention has been proposed to solve the problems of the conventional fire detection circuit described above, and an object of the present invention is to prevent a malfunction from occurring even when electromagnetic waves, surges, static electricity, etc. are generated from the surroundings. To provide a detector circuit.

The fire detector circuit according to the present invention for achieving the above object is a rectifying unit for rectifying the power supplied from the outside, a constant voltage setting unit for converting the power rectified through the rectifying unit into a constant voltage power source, the power supply from the constant voltage setting unit A light-receiving unit having a light-emitting element supplied and emitting light, a light-receiving unit having a light-receiving element driven by sensing light emitted from the light-transmitting unit when smoke is generated, and an SCR for generating a fire detection signal according to the driving of the light-receiving unit In the smoke-type smoke detector circuit comprising a drive unit, a bias resistor and a base is connected between the constant voltage setting unit and the transmitting unit, the collector is connected to the light emitting element of the transmitting unit, the emitter is provided with a transistor connected to the ground, Surge, electromagnetic waves, static electricity or the like set via the constant voltage setting unit When a high voltage greater than the voltage flowing through the bias resistor by being applied with a bias voltage to drive the base of the transistor is provided with a malfunction preventing portion to block the power supplied to the light emitting element portion songgwang.

The malfunction prevention part further includes a transistor having a base connected to the bias resistor, a collector connected to the light receiving element of the light receiving part, and an emitter connected to the ground.

On the other hand, the fire detector circuit according to the present invention is a rectifying unit for rectifying the power supplied from the outside, the sensing contact point which is contacted when the sensor is driven because the temperature is higher than the reference temperature, the power supply to the gate when the sensing contact contact In the differential or constant temperature fire detector circuit comprising the supplied and driven SCR, the bias resistor and the base is connected between the SCR gate and the sensing contact point, the collector is connected to the SCR gate and the detector contact (P) and already The transistor is connected to ground, and when a high voltage greater than the constant voltage set through the rectifier is introduced by surge, electromagnetic waves, static electricity, etc., a bias voltage is applied to the base of the transistor through a bias resistor and driven to drive the SCR. To cut off the power supply to the gate Malfunction prevention part is provided.

delete

delete

Best Mode for Carrying Out the Invention Preferred embodiments for realizing the present invention will now be described in detail with reference to the drawings.

4 is a circuit diagram of a smoke detector according to an embodiment of the present invention.
As shown in FIG. 4, the smoke-type fire detector circuit according to the embodiment of the present invention includes a rectifier 10 for rectifying power supplied from the outside and a constant voltage for converting the power rectified through the rectifier 10 into a constant voltage. The setting unit 20, a malfunction preventing unit 30 for preventing a circuit malfunction due to electromagnetic waves, surges, static electricity, etc. introduced from the outside, and a light transmitting unit 40 that receives power from the constant voltage setting unit 20 and emits light. And a light receiving unit 50 which is driven by sensing the light emitted by the light transmitting unit 40, and an SCR driving unit 60 which generates a fire occurrence signal according to the driving of the light receiving unit 50.
The rectifier 10 includes a surge observer TNR, a bridge diode BD, and a capacitor C41 connected to each other. When the overvoltage is introduced from the outside, the TNR protects the circuit by absorbing it. The bridge diode BD and the capacitor C41 rectify and smooth the incoming power.
The constant voltage setting unit 20 includes a plurality of resistors R61 and R62, a transistor Q48, and a zener diode ZD to maintain a constant current flowing through the rectifier 10 at a constant voltage. Do.
The malfunction prevention part 30 protects a circuit by absorbing high voltages such as electromagnetic waves, surges, static electricity, etc. when the bias resistors R43 and R44 and the transistors Q47 are connected in parallel to each other. Do this. When the resistance value of the bias resistors R43 and R44 is set to be high and the normal constant voltage is input, the malfunction prevention part 30 transmits the input constant voltage to the transmitter 40 as it is, so that the transistor star Q47 is not driven. When an abnormally high high voltage is input, the bias resistors R43 and R44 apply a bias voltage to the base of the transistor Q47 to drive the transistor Q47. The collector of the transistor Q47 is connected to the power lead-in of the transmitter 40 and the emitter is connected to ground. When the transistor Q47 is driven, the collector of the transistor Q47 absorbs the power of the transmitter 40 so that the transmitter 40 It will block the operation.
The transmitter 40 includes a plurality of resistors R47, R48, R49, R50, and R51, capacitors C47, C48, and C49, transistors Q41, Q42, and a light emitting element IRD. The light emitting device IRED periodically emits light by the power supplied from 20.
The light receiving unit 50 includes a light receiving element CELL, a plurality of resistors R53, R54, R55, R56, R57, R58, R59, R60, and capacitors C42, C43, C44, C45, C46, C50, C52, and Transistors Q43, Q44, and Q45, wherein the light-receiving element CELL does not detect light emitted from the light-emitting element IRD of the transmitter 40 in a normal state. Installed away from the direction of travel. The light receiving unit 50 is driven when the light emitted from the light emitting element IRD is refracted by the smoke and inputted to the light receiving element CELL when smoke is generated by a fire or the like.
The SCR driver 60 includes a transistor Q46, an SCR, a resistor R52, and a capacitor C51. When the light receiver 50 is driven, an SCR, which is a three-pole unidirectional thyristor, is driven and operated by driving the SCR. It serves to drive the alarm.

The operation of the smoke-type fire detector circuit having the above configuration will be described below.
Power supplied from the outside is rectified through the rectifying unit 10 and supplied to the constant voltage setting unit 20, the constant voltage setting unit 20 converts the rectified power into a constant voltage having a predetermined voltage and transmits to the malfunction prevention unit 30 do. The malfunction preventing part 30 is not driven because the bias value is not applied to the base of the transistor Q47 when the resistance value is set larger than that of the transmitting part 40 and the normal constant voltage is supplied. The constant voltage power transmitted via the malfunction prevention unit 30 is supplied to the capacitor C48 of the transmitter 40 to charge the capacitor C48. When the charging is completed, the constant voltage power is supplied to the resistors R47 and R48. Accordingly, the bias voltage is applied to the base of the transistor Q41 to drive the transistor Q41. In addition, the light emitting device IRED is driven together with the driving of the transistor Q41 to emit infrared light. In the embodiment of the present invention, the light emitting device IRED is about depending on the charge and discharge of the capacitor C48. It emits infrared light once every 5 seconds.
As the transistor Q41 is driven, a bias voltage is applied to the base of the transistor Q42 to drive the transistor Q42. In the normal case, the light receiving element CELL of the light receiving unit 50 emits light from the light emitting element IRD. Since it is not sensed, the transistor Q46 operated by the driving of the light receiving element CELL is not operated. Therefore, the power output from the transistor Q42 flows along the resistors R50 and R51 so that the SCR of the SCR driver 60 is not driven.
If smoke is generated by a fire or the like, the light receiving element CELL of the light receiving unit 50 receives the light emitted by the light emitting element IRD, and thus, the light receiving element CELL is driven, and thus the light receiving element CELL is driven. A bias voltage is applied to the base of the transistor Q43 according to the driving of the CELL, and the transistor Q44 is driven according to the driving of the transistor Q43, and the transistor Q45 according to the driving of the transistor Q44. ) Is driven.
As the transistor Q45 of the light receiver 50 is driven, a bias voltage is applied to the base of the transistor Q46 of the SCR driver 60, and the SCR is finally driven according to the driving of the transistor Q46. .
On the other hand, when a high voltage such as electromagnetic waves, surges or static electricity is instantaneously introduced from the outside, the malfunction preventing part 30 is driven by the high voltage. When a high voltage higher than a normal constant voltage power source is applied to the circuit, the voltage flows to the bias resistors R43 and R44 of the malfunction preventing part 30. As a result, a bias voltage is applied to the base of the transistor Q47 so that the transistor ( Q47 is driven, and the power flowing into the light-transmitting part 40 or the like flows along this transistor Q47 where the collector and the emitter are in the SHORT state as the transistor Q47 is driven, thereby supplying power to the light emitting element IRD. As the supply is cut off, the operation of the light emitting element IRD is stopped to prevent malfunction of the circuit.

5 is a circuit diagram of a smoke detector according to another embodiment of the present invention.
As shown in FIG. 5, the smoke-type fire detector circuit according to another embodiment of the present invention is slightly different from the configuration of the circuit of FIG. 4 and the malfunction preventing part 30.
In the malfunction prevention part 30 illustrated in FIG. 5, the base of the other transistor Q49 is connected to the other side of the bias resistors R43 and R44 to which the base of the transistor R47 is connected at one side thereof, and the collector of the transistor Q49 is The light receiver CELL of the light receiver 50 is connected to the resistor R57 and the capacitor C44, and the emitter is connected to the ground. Therefore, when a high high voltage such as electromagnetic waves, surge or static electricity flows into the circuit momentarily and a bias voltage is applied to the base of the transistor Q49 by the bias resistors R43 and R44, the transistor Q49 is driven. When input to the light receiving unit 50, the power by driving the light receiving element CELL of the light receiving unit 50 is not input to the base of the transistor Q43, but is supplied to the collector of the transistor Q49 so that Since the operation is blocked, it is possible to prevent the SCR driver 60 from malfunctioning.

6 is a circuit diagram of a differential or constant temperature fire detector according to another embodiment of the present invention.
As shown in FIG. 6, in the circuit of the differential or constant temperature fire detector, the conventional SCR gate and the sensing contact point P are directly connected through the resistor R31. Malfunction prevention unit 30 is provided.
The malfunction preventing portion 30 is formed by connecting the bias resistors R34 and R35 to the base of the transistor Q31 and the collector of the transistor Q31 connected between the gate of the SCR and the sensing contact point P. The bias resistors R34 and R35 are connected to the output terminal of the bridge rectifier 10. When the resistance value of the bias resistors R34 and R35 is set to be high and the normal power is supplied, the malfunction preventing part 30 is not driven because a bias voltage is not applied to the base of the transistor Q31.

If a high voltage such as electromagnetic waves, surges or static electricity is instantaneously introduced into the circuit, power is applied to the bias resistors R34 and R35 by the instantaneous high voltage and thus the base of the transistor Q31. The bias voltage is applied to the transistor Q31 to drive the power, and thus the power flowing toward the SCR gate flows along the collector and emitter of the transistor Q31 so that power is not applied to the SCR gate, thereby driving the SCR. This stops and prevents malfunction.

As described above, the fire detector circuit according to the present invention has the effect of protecting the circuit and preventing the malfunction at the same time when a high voltage flows due to surge, electromagnetic waves, static electricity, etc. through a malfunction prevention part composed of a bias resistor and a transistor. .

As a result, the circuit can be stabilized from malfunctions, the reliability of the fire detector can be secured, and the development of related industries can be achieved.

On the other hand, the present invention is not limited to the above-described specific preferred invention, and any person skilled in the art to which the present invention pertains can make various changes without departing from the gist of the present invention as claimed in the claims. It will be possible.

Claims (3)

Rectification unit 10 for rectifying the power supplied from the outside, a constant voltage setting unit 20 for converting the power rectified through the rectifier 10 into a constant voltage power, and receives power from the constant voltage setting unit 20 A light transmitting unit 40 provided with a light emitting element IRED for emitting light, a light receiving unit 50 including a light receiving element CELL driven by sensing light emitted from the light transmitting unit 40 when smoke is generated; In the smoke-type fire detector circuit comprising a SCR driver 60 for generating a fire detection signal in accordance with the drive of the light receiving unit 50, Bias resistors R43 and R44 and a base are connected between the constant voltage setting unit 20 and the light transmitting unit 40, a collector is connected to a light emitting element IRD of the light transmitting unit, and an emitter is connected to ground. When a high voltage greater than the constant voltage set through the constant voltage setting unit 20 is introduced by surge, electromagnetic waves, static electricity, or the like, a bias voltage is applied to the base of the transistor Q47 through the bias resistors R43 and R44. A fire detector circuit, characterized in that it is provided with a malfunction prevention unit 30 to cut off the power supplied to the light emitting device (IRED) of the transmitting unit 40. The method of claim 1, The malfunction prevention unit 30 A base is connected to the bias resistor (R43) (R44), the collector is connected to the light receiving element (CELL) of the light receiving unit 50, the emitter is characterized in that the transistor Q49 further comprises a ground connected Circuit. Rectifier 10 for rectifying the power supplied from the outside, the temperature is higher than the reference temperature, the sensing contact point (P) which is contacted when the sensor is driven, and when the sensing contact point (P) is in contact with the power supply to the gate In the differential or constant temperature fire detector circuit comprising a supplied SCR driven, Between the SCR gate and the sensing contact point (P) is provided with a transistor (Q31) is connected to the bias resistors (R34, R35) and the base, the collector is connected to the SCR gate and detector contact (P), the emitter is connected to ground When a high voltage greater than the constant voltage set through the rectifying unit 10 is introduced by surge, electromagnetic wave, static electricity, or the like, a bias voltage is applied to the base of the transistor Q31 through the bias resistors R34 and R35 to drive the detector. Fire detection circuit (30) is provided with a malfunction prevention unit (30) for interrupting the power supplied to the SCR gate.

Images