KR20080040531A - Fire detector - Google Patents

Abstract

A fire detector is provided to prevent an alarm from being outputted by malfunction if disturbance is temporally generated in a power source of the fire detector by voltage of 24V or external surge, static electricity, and electronic waves by using a bias resistor and a transistor. A fire detector has a sensing unit for detecting the rise of temperature or smoke concentration, and transmits a signal of the sensing unit to an alarm device. Bias resistors(R43,R44) and a transistor are inserted into at least one spot of an electronic circuit. A TNR surge-up server(C41) is inserted into the electronic circuit. If excessive voltage is inputted by surge voltage and static electricity, power is disturbed and the emission of infrared rays is temporally stopped by discharging a condenser(C48), in order to prevent malfunction.

Description

Fire detector

1 is a perspective view of a fire detector

2 is a conventional fire detector circuit diagram (smoke type)

3 is a conventional fire detector circuit diagram (differential type, constant temperature type)

4 is a circuit diagram of the present invention.

5 is a circuit diagram according to another embodiment of the present invention.

6 is a circuit diagram according to another embodiment of the present invention.

※ Explanation of symbols for main parts of drawing

R1 resistance R2 resistance

R3 resistance R4 resistance

R5 resistance R43 resistance

R44 Resistor C1 Capacitor

C2 Capacitor C41 Capacitor (Surge pressure soba)

Q1 Transistor Q2 Transistor

Q41 transistor Q47 transistor

TNR Surge Absorption IRED Infrared Emitting Diode

LED light emitting device CELL light receiving device

R34 resistance R35 resistance

L31 light emitting element S31 S.C.R

Q31 transistor c47 capacitor

C49 Capacitor Q49 Transistor

CELL1 Receiver Q5 Transistor

Q6 transistor IRED light emitting device

Q49 transistor

The present invention relates to a fire detector, and more specifically, to a differential, constant temperature fire detector for detecting a change in heat, and a photoelectric and ionized detector for detecting a change in concentration of smoke.

The detector is composed of a detection unit for detecting a fire and an electronic circuit unit for converting the temperature smoke concentration detected by the detection unit into a predetermined signal.

The present invention relates to an electronic circuit of a fire detector, and the description of the structure of the fire detector detector is not related to the present application, and thus detailed illustration and description thereof will be omitted.

2 is a conventional smoke detector circuit diagram;

When DC 24V power supply voltage is input to J1, J2, only + power is always applied regardless of polarity input through DIODE (D1, D2, D3, D4). ACPA included in DC power is attenuated by CAPASITER (C3), and constant power is supplied by constant voltage circuit composed of RESISTER (R1), TRANSISTER (Q1), and ZENER DIODE (D5).

B + constant pressure is applied to the capacitor (C4) via the resistor (R5) and the capacitor (C4) is charged.If the transformer (Q2) is operated by the resistor (R3, R4) bias voltage, the power to the base of the transformer (Q3) is supplied. The light emitting sensor ILD1 is activated by operating the TRANSISTER (Q3). The CELL1 input and oscillator output TRANSISTER (Q4) and receiver output TRANSISTER (Q7) are driven, and the emitter and collector are in the SHORT state, causing the emitter to have a low voltage. This causes the TRANSISTER (Q8) base to go low and operate the emitter collector SHORT state of the TRANSISTER (Q8) so that the operating power supply voltage flows into the collector to turn on the LED (LED1) and H1 to the TRANSISTER (Q9) base. This causes the emitter collector to be in the SHORT state, so the TRANSISTER (Q8) base will always have a low voltage and the LED will light continuously.

When the SENSER signal is input to CELL1, a voltage is applied across the CAPASITOR (C9) to the TRANSISTOR (Q5) base, and the TRANSISTOR (Q5) emitter and collector are in the SHORT state, and the LOW voltage is applied to the TRANSISTOR (Q6) base. This causes the TRANSISTOR (Q6) to operate, the B + voltage past the RESISTOR (R8, R10) is applied to the TRANSISTOR (Q7) base past the CAPASIROT (C10) and the TRANSISTOR (Q7) to operate. The variable resistor (R13) allows you to adjust the B + voltage across the TRANSISTOR (Q6).

Figure 3 is a differential, constant temperature circuit that is a conventional heat sensor,

When the detector power supplied from the receiver flows in through A and B, the breach rectifier circuit composed of diodes D31-D34 has a nonpolar power in the connecting direction.

When the detector operates, the sensing contact point P contacts, and the detector power is applied to the gate of S.C.R through the resistor (R31) and resistor (R32).

In the fire detector, it is important to insert a circuit that prevents malfunction due to electromagnetic waves, surges and static electricity from the surroundings. That is, as shown in Fig. 4, a circuit such as R43, R44, Q47, etc. of the soft detector can be inserted to prevent malfunction.

Although 24V voltage is applied in the fire detector, if the detector power supply is temporarily disturbed due to external surge, static electricity or electromagnetic wave, a malfunction occurs in the fire detector and an alarm is triggered. The circuit for preventing this will be described in detail in the configuration of the invention.

6 is another embodiment of the present circuit.

In differential and constant temperature fire detectors, the circuit consisting of R35, R36, and Q37 is a circuit to prevent malfunction by temporarily stopping the signal at the S.C.R gate when power disturbance occurs due to surge voltage and static electricity.

5 is another embodiment of the present circuit.

R63 and Q49 are inserted into the photoelectric smoke detector light receiver, and resistors R43 and R44 Q49 are inserted into the light receiver to temporarily stop the operation of the light receiver.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments for realizing the present invention will be described in detail with reference to the drawings.

4 shows a transmitting part composed of R47, R48, C47, R49, C49, Q41, Q42, IRE and C48, emits infrared rays through IRED once in about 5 seconds.

TR Q41 and Q42 are composed of PUT circuits, and when appropriate voltage is charged to C48 through R45 and R46, it automatically discharges through IRED, Q42, R5O and R51, and emits infrared rays.

The circuit composed of R43, R44 and Q47 is a circuit to prevent malfunction by temporarily stopping infrared firing operation due to discharge of capacitor C48 when excessive voltage is drawn due to surge voltage and static electricity.

In another embodiment of the present invention, as shown in FIG. 5, the operation of the light receiving unit can be temporarily stopped due to the operations of the R63 and the transistor Q49.

As another embodiment of the present invention, Figure 6 can temporarily pause the operation of the gate of S.C.R due to the operation of R34, R35, Q31.

As described above, the prevention of malfunctions from the electrostatic electromagnetic wave surge of the fire detector is an important solution. In order to determine this, a circuit composed of a bias resistor and a transistor is an important problem solving means for preventing the malfunction.

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

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 (2)

In the detection unit for detecting a rise in temperature or smoke concentration rise and the electronic circuit of the fire detector for transmitting the signal to the alarm device, A fire detector, characterized in that at least one bias resistor (R43, R44) and transistor (47) are inserted into an electronic circuit. 2. The fire detector according to claim 1, wherein a TNR surgeup server (C41) is inserted.

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