Pyroelectric infrared sensor
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AD312 Pyroelectric Infrared Sensor
AD312 is a low-power digital pyroelectric sensor with a built-in pyroelectric infrared processing chip, offering ultra-low power consumption and significantly extending battery life.
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GA312 Pyroelectric Infrared Sensor
The digital intelligent pyroelectric sensor GA312 employs a dedicated infrared human-body processing integrated circuit as its built-in processing chip. This integrated circuit features all the functions of conventional passive infrared pyroelectric motion detectors. The thermal motion signals detected by the pyroelectric sensing element are fed into the high-input-impedance input terminals of the intelligent digital chip. The pyroelectric signals are then converted into 15-bit digital signals and subjected to digital bandpass filtering. The filtered signals are compared with internally set sensitivity and timing digital thresholds. When the pyroelectric digital signal exceeds the corresponding threshold, a delayed REL-level output is generated. All signal processing is performed entirely within the sensor’s built-in processing chip.
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What is the difference between electronic and electromagnetic residual current devices?
① Electromagnetic trip-type residual current devices use an electromagnetic trip mechanism as an intermediate component. When a leakage current occurs, the mechanism trips and disconnects the power supply. The drawbacks of this type of protector are: high cost and complex manufacturing processes. Its advantages include: strong immunity to interference and excellent resistance to shocks (such as overcurrent and overvoltage surges) provided by its electromagnetic components; no need for an auxiliary power supply; and unchanged leakage characteristics even under zero-voltage conditions or after phase failure.
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A fuse resistor functions like a regular resistor under normal conditions. However, once a circuit fault occurs and the resistor’s rated power is exceeded, it will automatically disconnect the circuit within a specified time, thereby protecting other components from damage. Fuse resistors come in two types: non-repairable and repairable. In circuit diagrams, they serve a dual role as both a fuse and a resistor, and are primarily used in the output circuits of power supplies and secondary power sources. These resistors typically have low resistance values (ranging from a few ohms to tens of ohms) and low power ratings (from 1/8 W to 1 W). Their primary function is to promptly melt and break the circuit when an overcurrent occurs, thus safeguarding other components in the circuit from damage. For example, if a short circuit occurs in the circuit load...
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