A circuit of a pyroelectric infrared switch application BISS0001

BISS0001 is a sensor signal processing with higher performance integrated circuits, which together with the pyroelectric infrared sensors and a small amount of external components constitute passive pyroelectric infrared switch. It can automatically
A circuit of a pyroelectric infrared switch application BISS0001 - schematic

and quickly open various types of incandescent, fluorescent, buzzer, automatic doors, electric fans, dryers and automatic sinks and other devices, especially for enterprises, hotels, shopping malls, warehouses and family aisles, corridors and other sensitive area, or automatic lighting, lighting and alarm systems for the security zone.
The figure above, the output signal of the operational amplifier OP1 pyroelectric infrared sensor as the first stage amplifier, and then by the C3 coupled to the operational amplifier OP2 for the second stage amplifier, and then through the two-way amplitude voltage comparator COP1 and COP2 after the treatment, the effective detection trigger signal Vs to start delay timer, the output signal Vo amplification by the transistor T1 is turned on to drive a relay load.
The figure above, R3 is photosensitive resistance, to detect environmental illumination. When used as lighting control, if the environment brighter, the resistance value of R3 will be reduced, so that the input pin 9 is held low, thereby blocking the trigger signal Vs. SW1 is a work mode selection switch SW1 when communicating with an end when the chip is re-trigger work; when SW1 in communication with the second end, the chip is at the non-repeatable trigger work. FIG R6 can adjust the size of the gain of the amplifier, the original drawings selected 10K, actual use can 3K, can improve the gain of the circuit to improve circuit performance. Output delay time Tx by an external R9 and sizing C7 triggered by an external blocking time Ti R10 and C6 resizing, R9 / R10 470 ohms may be used, C6 / C7 can choose 0.1U.

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