Sensing apparatus for AC power supply

Abstract

The invention relates to an alternating current power detection device for detecting the state of an alternating current power. The device comprises a detection circuit and a microprocessor; the detection circuit comprises a first voltage source, a first resistor and a photoelectric coupler with a bidirectional light emitting diode and a photosensitive audion; the live wire end of the alternating current power is connected with one end of the bidirectional light emitting diode; the zero wire end of the alternating current power is connected with the other end of the bidirectional light emitting diode; the emitting electrode of the photosensitive audion is earthed; the collecting electrode of the photosensitive audion is connected with an interruption pin of the microprocessor and a detection pin and is connected with the first voltage source through the first resistor; the output end of the microprocessor is used for connecting an electric appliance; a state signal of the alternating current power is provided for the microprocessor through a detection circuit and triggers an inner detection program of the microprocessor to carry out real-time analysis on the state of the alternating current power; and the output end of the microprocessor provides an analytic result for the electric appliance. The detection circuit is simple and low in cost.

Description

technical field [0001] The invention relates to an AC power detection device. Background technique [0002] Generally, the server racks in the network computer room are often equipped with a single-phase AC power backup system, such as an uninterrupted power system (uninterrupted power system, UPS) or an environmental power monitoring device, to prevent abnormalities in the AC power supply, such as instantaneous power failure, short-term interruption, Power outages or frequency drifts cause network server interruption or backup data loss, so the status of the AC power supplied to the server rack must be detected in real time, and the abnormal status must be quickly provided to the back-end server for backup AC power and Abnormal AC power swapping to allow the server to continue operating normally. [0003] The current AC power state detection device uses a transformer step-down structure or a capacitor step-down structure. After step-down and rectification, the step-down ci...

AI Technical Summary

Problems solved by technology

[0003] The current AC power state detection device uses a transformer step-down structure or a capacitor step-down structure. After step-down and rectification, the step-down circuit is used to drive the back-end photocoupler to conduct, and the conduction signal is monitored by the microprocessor. If the AC power supply is interrupted or the power failure causes the monitoring signal to open, it will immediately notify the AC power backup system and the server to operate. However, both devices use capacitors as voltage step-down and smoothing filter circuits. Due to the slow charging and discharging of capacitors, they cannot be detected. Instantaneous or brief interruption of AC power supply, and there is a delay in the detection circuit

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