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Mute circuit for photoelectric smoke alarm

A technology for smoke alarms and mute circuits, applied in alarms, fire alarms, instruments, etc., which can solve the problems of non-provision of smoke alarm circuits, increased costs and costs, and achieve strong practicability and save procurement costs and costs , The effect of simple control method

Active Publication Date: 2015-06-10
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current general photoelectric smoke alarm circuit does not provide this function, and needs a special integrated circuit to realize this application, which causes users to purchase special chips to realize this function, which increases the purchase cost and cost

Method used

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  • Mute circuit for photoelectric smoke alarm
  • Mute circuit for photoelectric smoke alarm
  • Mute circuit for photoelectric smoke alarm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] In order to better understand the technical solutions of the present invention, specific embodiments will be described in detail below in conjunction with the accompanying drawings.

[0023] see image 3 , a mute circuit for a photoelectric smoke alarm of the present invention, externally connected with a 9V power supply and a sensor, the mute circuit includes a capacitor C, a test key K, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor Resistor R4, first transistor Q1, second transistor Q2 and diode D. The first resistor R1, the third resistor R3 and the fourth resistor R4 are all high resistance resistors.

[0024] The positive pole of the capacitor C, the test key K, the first resistor R1, the second resistor R2 and the collector of the first triode Q1 are connected sequentially; the connecting end of the test key K and the first resistor R1 is connected to the positive pole of the 9V power supply; the second The base of a transisto...

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Abstract

The invention discloses a mute circuit for a photoelectric smoke alarm. The mute circuit comprises a capacitor, a testing key, a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode, a second triode and a diode, wherein a positive electrode of the capacitor, the testing key, the first resistor, the second resistor and the collector electrode of the first triode are connected with one another in sequence, the base electrode of the first triode is connected with the positive electrode of the capacitor through the third resistor, the base electrode of the first triode is connected with the negative electrode of the capacitor through the fourth resistor, the emitting electrode of the first triode is connected with the ground, the base electrode of the second triode is connected with the connecting ends of the first resistor and the second resistor, the emitting electrode of the second triode is connected with the positive electrode of a 9V power supply, and the collector electrode of the second triode is connected with the positive electrode of the diode. The improvement and optimization of peripheral circuits are adopted, the mute circuit is applied to the photoelectric smoke alarm, therefore, the muting function can be well achieved, and the requirements of clients are met.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a mute circuit for a photoelectric smoke alarm. technical background [0002] Due to the activities of indoor personnel, such as cooking fumes, temporary smoking, etc., the smoke alarm will alarm, which requires the HUSH (mute) function, which reduces the sensitivity of the alarm for a period of time and makes the alarm pause. [0003] The current general photoelectric smoke alarm circuit does not provide this function, and needs a special integrated circuit to realize this application, which causes the user to purchase a special chip to realize this function, which increases the purchase cost and cost. [0004] see figure 1 , taking Motorola's model MC146010 photoelectric smoke alarm integrated circuit as an example, this photoelectric smoke alarm integrated circuit can realize the mute function, there is an optical labyrinth in the photoelectric smoke alarm, which is the flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B17/103
Inventor 聂纪平
Owner SHANGHAI BEILING
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