5 results about "Current pulse" patented technology

The invention belongs to the field of domestic PM2.5 detection, particularly relates to a PM2.5 detector and a detection method thereof, aims at solving the problems that an existing PM2.5 detector is relatively large in detection error, and a traditional dust particle laser counter is high in cost and large in volume, and provides a PM2.5 detector. The PM2.5 detector comprises a cavity, a laser device, a photoelectric detector and a fan, wherein the cavity is divided into an air inlet channel, a detection channel and an air outlet channel; the laser device is arranged in the air inlet channel; the photoelectric detector is used for detecting a scattered light and converting a light signal of the scattered light into a current pulse signal; and the fan is located at the tail end of the air outlet channel and is used for generating airflow with preset flow rate. The detection method of the detector is simple and convenient; the PM2.5 detector provided by the invention is small in volume; the detection accuracy reaches 80%; the cost is relatively low; and the PM2.5 detector is convenient to be widely applied to handheld PM2.5 detection equipment.

A fault clearing circuitry (10) is disclosed, which comprises an electrical energy storage (12), at least one controllable switch (14) connectable between the electrical energy storage (12) and at least one electric line (16; 16', 16", 16"'), and a control circuit (18) configured to monitor the at least one electric line (16) for a fault and to close the at least one switch (14) if a fault is detected wherein the electrical energy storage (12; 12') is provided for storing an amount of electrical energy dimensioned to be sufficient for releasing one or more circuit breakers or clearing one or more fuses in the at least one electrical line (16, 16', 16", 16"') in order to clear the fault, and wherein the control circuit (18; 18') is configured to close the at least one switch (14; 14', 14",14"') if a fault is detected such that a discharging of the electrical energy stored in the electrical energy storage (12; 12') causes a current pulse injected in the at least one electrical line (16,16', 16", 16"') so that a higher current in the at least one electrical line (16, 16', 16", 16"') is incurred for a limited time span, wherein the time limited higher current may release the one or more circuit breakers or clear the one or more fuses in the at least one electrical line (16, 16', 16", 16"').