Pyroelectric type infrared detector and control method thereof

Abstract

The invention provides a pyroelectric type infrared detector and a control method thereof. The pyroelectric type infrared detector is controlled by the battery power and comprises a control IC (Integrated Circuit), a photosensitive CDS (Controlled Delivery System) detection circuit, a low-voltage detection circuit and a buzzer, wherein the control IC closes an analogue amplifier of the pyroelectric type infrared detector to save the battery power when the photosensitive CDS detection circuit detects that the pyroelectric type infrared detector is at an daytime environment; the control IC starts the analogue amplifier when the photosensitive CDS detection circuit detects that the pyroelectric type infrared detector is not at the daytime environment; and the control IC starts the buzzer to notify a user when the low-voltage detection circuit detects that the batter power is excessively low.

Description

technical field [0001] The invention relates to a pyroelectric infrared detector, in particular to a control circuit of the pyroelectric infrared detector. Background technique [0002] In view of the increasing awareness of environmental protection, the demand for energy-saving sensing devices is also increasing. At present, the most common light source automatic control devices on the market are mostly pyroelectric infrared detectors (Pyroelectric Infrared Sensor, PIR); this device is generally applicable to homes, offices, public places, etc. The device itself is used to detect human infrared rays, and then trigger lamps or security systems. [0003] Generally speaking, the location where the pyroelectric infrared detector is erected is usually at a high place or where there is no mains power supply, and the power source used by the detector is usually a battery, so the power consumption of the detector itself is relatively low. important. The average power consumption...

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Problems solved by technology

[0006] On the other hand, by figure 1 It can also be seen that in the low-voltage detection circuit 12 used for power supply detection in the existing pyroelectric infrared detectors, most of them use the method of resistor voltage division to detect the battery power Vcc; however, the resistance impedance is large Although it is relatively power-saving, the signal is easily disturbed, causing the low-voltage detection circuit 12 to be easily activated by mistake.

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