Independent photoelectric smoke-sensing fire detection alarm circuit

Abstract

The utility model relates to the technical field of fire detection alarms, in particular to an independent photoelectric smoke-sensing fire detection alarm circuit, which can meet the driving requirements of an infrared LED (light-emitting diode) and a blue light LED only by using a common 3V battery and prolong the service life of the product battery, and comprises an infrared LED lamp, a blue light LED lamp and a photoelectric receiving tube which are arranged in a detection box, a cathode of the infrared LED lamp and a cathode of the blue light LED lamp are respectively connected with a pin 1 and a pin 2 of the MCU chip U1, a pin 4 of the MCU chip U1 is connected with one end of a resistor R1, one end of a capacitor C3 and a VDD, the other end of the capacitor C3 is grounded, the other end of the resistor R1 is connected with a positive electrode of a battery BT1, a negative electrode of the battery BT1 is grounded, a pin 15 of the MCU chip U1 is connected with one end of a capacitor C6, a positive electrode of the infrared LED lamp and a positive electrode of the blue light LED lamp, and the other end of the capacitor C6 is connected with a negative electrode of the battery BT1. The anode of the photoelectric receiving tube is connected with the sixth pin of the MCU chip U1, and the cathode of the photoelectric receiving tube is connected with the fifth pin of the MCU chip U1.

Description

TECHNICAL FIELD

[0001] The utility model relates to fire detection alarm technology field, concretely is a kind of independent photoelectric smoke fire detection alarm circuit. BACKGROUND

[0002] Common fire detection alarm will install infrared LED and blue light LED, utilize photoelectric effect to receive the light of 2 wavelengths received by receiving tube is converted into electric signal and is judged by the difference of signal's intensity and change, and then form the independent smoke alarm of fire detection;If using ordinary 3V battery power supply, 3V battery cannot reliably drive blue light LED, only the smoke judgment mechanism of single wavelength light source of infrared LED can be used, water vapor and dust are easily mistaken for fire smoke. There are also some using 9V battery power supply, but 9V battery capacity is relatively small, and the output current capacity is small, and the driving current of red and blue dual-wavelength photoelectric smoke detection is relatively large, so that the battery use time of the whole alarm is too short, generally more than 2 years. SUMMARY

[0003] In order to solve the above technical problems, the utility model provides an independent photoelectric smoke fire detection alarm circuit, which only needs to use ordinary 3V battery to meet the driving demand of infrared LED and blue light LED, and improves the service life of product battery.

[0004] Its technical scheme is as follows: an independent photoelectric smoke fire detection alarm circuit, which comprises an infrared LED lamp, a blue light LED lamp and a photoelectric receiving tube installed in a detection box, characterized in that the cathode of the infrared LED lamp and the cathode of the blue light LED lamp are respectively connected to pin 1 and pin 2 of MCU chip U1 of model A96F928NBS20AJ, pin 4 of the MCU chip U1 is connected to one end of resistor R1, one end of capacitor C3 and VDD, the other end of the capacitor C3 is grounded, the other end of the resistor R1 is connected to the positive electrode of battery BT1, the negative electrode of the battery BT1 is grounded, pin 15 of the MCU chip U1 is connected to one end of capacitor C6, the anode of the infrared LED lamp and the anode of the blue light LED lamp, the anode of the photoelectric receiving tube is connected to pin 6 of the MCU chip U1, and the cathode is connected to pin 5 of the MCU chip U1.

[0005] Further characterized in that the cathode of the battery BT1 is connected to one end of capacitor C2 and one end of inductor L1, the other end of the capacitor C2 is connected to one end of inductor and the anode of the battery BT1, the other end of the inductor L1 is connected to the anode of diode D1 and pin 19 of the MCU chip U1, the cathode of the diode D1 is connected to one end of capacitor C1 and pin 18 of the MCU chip U1, pin 16 and pin 17 of the MCU chip U1 are connected to interface JP1, and the interface JP1 is connected to a buzzer piece.

[0006] The MCU chip U1 is further connected with an infrared receiving module, the infrared receiving module comprises an infrared receiving head U2 with a model of IRM-3638, one end of a resistance R3 connected with a 3-pin of the infrared receiving head U2, one end of a capacitor C7 connected with a 2-pin of the infrared receiving head U2, the other end of the resistance R3 connected with an 8-pin of the MCU chip U1, one end of a capacitor C4 connected with a 1-pin of the infrared receiving head U2, the other end of the capacitor C7 and the ground, one end of a resistance R7 connected with an 11-pin of the MCU chip U1, the other end of the resistance R7 connected with one end of a resistance R2, one end of a capacitor C11, one end of a resistance R6 and the ground, one end of a sound-eliminating self-checking button AN1 connected with an 11-pin of the MCU chip U1, one end of a capacitor C5 connected with the other end of the sound-eliminating self-checking button AN1 and the ground, the other end of the capacitor C11 connected with a cathode of a red LED lamp and a cathode of a green LED lamp, one end of a resistance R4 connected with an anode of the red LED lamp and one end of a capacitor C9, the other end of the resistance R4 and the other end of the capacitor C9 connected and connected with a 10-pin of the MCU chip U1, one end of a resistance R5 connected with an anode of the green LED lamp and one end of a capacitor C8, the other end of the resistance R5 and the other end of the capacitor C8 connected and connected with a 9-pin of the MCU chip U1, one end of a resistance R6 connected with a sound-eliminating button AN2, the other end of the button AN2 connected with a 7-pin of the MCU chip U1;

[0007] A 4-pin of a pin header seat JP2 is connected with a 12-pin of the MCU chip U1, and a 3-pin of the pin header seat JP2 is connected with a 13-pin of the MCU chip U1, a 1-pin of the pin header seat JP2 is connected with one end of the capacitor C10, and the other end of the capacitor C10 is connected with a 2-pin of the pin header seat JP2;

[0008] A 2-pin of a pin header seat JP3 is connected with a 3-pin of the MCU chip U1, and a 1-pin of the pin header seat JP3 is connected with a 7-pin of the MCU chip U1, a 3-pin of the pin header seat JP3 is connected with one end of a resistance R8 and VDD, the other end of the resistance R8 is connected with a 2-pin of the pin header seat JP3, and a 4-pin of the pin header seat JP3 is connected with the ground.

[0009] After the utility model is used, 3V battery power supply is boosted and stored energy, and then infrared LED and blue LED are alternately and regularly driven with constant current, the photoelectric effect of a receiving tube is used to obtain electric signals of two wavelength parameters of red and blue light, so that the signal strength and change difference can be comprehensively judged, whether it is fire smoke is determined and specific concentration is obtained to carry out fire alarm, meanwhile, the capacity of 3V battery is large, the capacitor is used to store electricity, and then infrared LED and blue LED can be driven with constant current, and the use time of the battery is effectively improved to 5 years. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the circuit principle diagram of the utility model; DETAILED DESCRIPTION

[0011] See Figure 1 As shown in the figure, a self-contained photoelectric smoke fire detection alarm circuit, which includes an infrared LED lamp, a blue LED lamp, a photoelectric receiving tube installed in the detection box, the cathode of the infrared LED lamp and the cathode of the blue LED lamp are connected to pin 1 and pin 2 of MCU chip U1 of type A96F928NBS20AJ respectively, pin 4 of MCU chip U1 is connected to one end of resistor R1, one end of capacitor C3 and VDD, the other end of capacitor C3 is grounded, the other end of resistor R1 is connected to the positive electrode of battery BT1, the negative electrode of battery BT1 is grounded, pin 15 of MCU chip U1 is connected to one end of capacitor C6, the anode of the infrared LED lamp and the anode of the blue LED lamp, the anode of the photoelectric receiving tube is connected to pin 6 of MCU chip U1, and the cathode is connected to pin 5 of MCU chip U1.

[0012] The cathode of battery BT1 is connected to one end of capacitor C2 and one end of inductor L1, the other end of capacitor C2 is connected to one end of inductor and the anode of battery BT1, the other end of inductor L1 is connected to the anode of diode D1 and pin 19 of MCU chip U1, the cathode of diode D1 is connected to one end of capacitor C1 and pin 18 of MCU chip U1, pin 16 and pin 17 of MCU chip U1 are connected to interface JP1, the interface JP1 is connected to a buzzer, a small inductance continuation inductor L1 is used, the buzzer driving voltage is first raised to a certain value and then the signal output is controlled. The inductor volume is reduced, which is convenient for installation and use of small volume shell. The efficiency of the boost circuit is higher than that of the resonant boost, the overall power consumption is low, and stable energy storage can be achieved with small capacitors. The voltage rise value can be controlled by the boost duty ratio, so that the sound pressure level of the buzzer can be controlled and stabilized at 90dB or other sound pressure levels.

[0013] The MCU chip U1 is also connected with an infrared receiving module, the infrared receiving module comprising an infrared receiving head U2 of model IRM-3638, the 3-pin of the infrared receiving head U2 being connected with one end of a resistor R3 and one end of a capacitor C7, the other end of the resistor R3 being connected with the 8-pin of the MCU chip U1, the 2-pin of the infrared receiving head U2 being connected with one end of a capacitor C4, the other end of the capacitor C7 and the ground, the 1-pin of the infrared receiving head U2 being connected with one end of a resistor R7, the other end of the capacitor C4, the 14-pin of the MCU chip U1, the other end of the resistor R7 being connected with one end of a resistor R2, one end of a capacitor C11, one end of a resistor R6 and the ground, the other end of the resistor R2 being connected with one end of a mute self-check button AN1, one end of a capacitor C5 and the 11-pin of the MCU chip U1, the other end of the mute self-check button AN1 and the other end of the capacitor C5 being grounded, the other end of the capacitor C11 being connected with the cathode of a red LED lamp and the cathode of a green LED lamp, the anode of the red LED lamp being connected with one end of a resistor R4 and one end of a capacitor C9, the other end of the resistor R4 and the other end of the capacitor C9 being connected and connected with the 10-pin of the MCU chip U1, the anode of the green LED lamp being connected with one end of a resistor R5 and one end of a capacitor C8, the other end of the resistor R5 and the other end of the capacitor C8 being connected and connected with the 9-pin of the MCU chip U1, the other end of the resistor R6 being connected with one end of an anti-disassembly button AN2, the other end of the button AN2 being connected with the 7-pin of the MCU chip U1; the 12-pin and the 13-pin of the MCU chip U1 being connected with the 4-pin and the 3-pin of a pin header JP2 respectively, the 1-pin and the 2-pin of the pin header JP2 being connected with both ends of a capacitor C10 respectively; the 3-pin and the 7-pin of the MCU chip U1 being connected with the 2-pin and the 1-pin of a pin header JP3 respectively, the 3-pin of the pin header JP3 being connected with one end of an adjustable resistor R8 and VDD, the other end of the adjustable resistor R8 being connected with the 2-pin of the pin header JP3, the 4-pin of the pin header JP3 being grounded.

[0014] The high-sensitivity receiving head, the focusing lens amplification and the waveform arrangement circuit, the photoelectric conversion ability of the infrared light pulse signal, the receiving ability of the ordinary household infrared remote controller is improved.

Claims

1. A stand-alone photoelectric smoke detector circuit, comprising an infrared LED, a blue LED, and a photoelectric receiver installed in a detector box, characterized in that, The cathodes of the infrared LED and the blue LED are respectively connected to pins 1 and 2 of the MCU chip U1 (model A96F928NBS20AJ). Pin 4 of the MCU chip U1 is connected to one end of resistor R1, one end of capacitor C3, and VDD. The other end of capacitor C3 is grounded. The other end of resistor R1 is connected to the positive terminal of battery BT1. The negative terminal of battery BT1 is grounded. Pin 15 of the MCU chip U1 is connected to one end of capacitor C6, the anode of the infrared LED, and the anode of the blue LED. The anode of the photodetector is connected to pin 6 of the MCU chip U1, and the cathode is connected to pin 5 of the MCU chip U1.

2. The independent photoelectric smoke detector circuit according to claim 1, characterized in that, The cathode of the battery BT1 is connected to one end of capacitor C2 and one end of inductor L1. The other end of capacitor C2 is connected to one end of inductor and the anode of battery BT1. The other end of inductor L1 is connected to the anode of diode D1 and pin 19 of MCU chip U1. The cathode of diode D1 is connected to one end of capacitor C1 and pin 18 of MCU chip U1. Pins 16 and 17 of MCU chip U1 are connected to interface JP1. Interface JP1 is connected to a buzzer.

3. The independent photoelectric smoke detector circuit according to claim 1, characterized in that, The MCU chip U1 is also connected to an infrared receiving module, which includes an infrared receiver U2 of model IRM-3638. Pin 3 of the infrared receiver U2 is connected to one end of resistor R3 and one end of capacitor C7. The other end of resistor R3 is connected to pin 8 of the MCU chip U1. Pin 2 of the infrared receiver U2 is connected to one end of capacitor C4, the other end of capacitor C7, and ground. Pin 1 of the infrared receiver U2 is connected to one end of resistor R7, the other end of capacitor C4, and pin 14 of the MCU chip U1. The other end of resistor R7 is connected to one end of resistor R2, one end of capacitor C11, one end of resistor R6, and ground. The other end of resistor R2 is connected to one end of the mute self-test button AN1, one end of capacitor C5, and the... Pin 11 of MCU chip U1, the other end of the mute self-test button AN1 and the other end of capacitor C5 are both grounded. The other end of capacitor C11 is connected to the cathode of the red LED and the cathode of the green LED. The anode of the red LED is connected to one end of resistor R4 and one end of capacitor C9. The other end of resistor R4 and the other end of capacitor C9 are connected to pin 10 of MCU chip U1. The anode of the green LED is connected to one end of resistor R5 and one end of capacitor C8. The other end of resistor R5 and the other end of capacitor C8 are connected to pin 9 of MCU chip U1. The other end of resistor R6 is connected to one end of anti-tamper button AN2. The other end of button AN2 is connected to pin 7 of MCU chip U1.

4. The independent photoelectric smoke detector circuit according to claim 1, characterized in that, Pins 12 and 13 of the MCU chip U1 are connected to pins 4 and 3 of the pin header JP2, respectively, and pins 1 and 2 of the pin header JP2 are connected to the two ends of the capacitor C10, respectively.

5. The independent photoelectric smoke detector circuit according to claim 1, characterized in that, Pins 3 and 7 of the MCU chip U1 are connected to pins 2 and 1 of the pin header JP3, respectively. Pin 3 of the pin header JP3 is connected to one end of the adjustable resistor R8 and VDD. The other end of the adjustable resistor R8 is connected to pin 2 of the pin header JP3. Pin 4 of the pin header JP3 is grounded.

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