AC power supply fault detection and monitoring device
A technology for AC power supply and fault monitoring, which is applied in the field of AC power supply fault monitoring devices, and can solve the problems that the timeliness of fault monitoring is difficult to meet the actual requirements, delay, and the rapidity of fault detection is poor.
Pending Publication Date: 2021-10-22
HONEYWELL ENVIRONMENTAL & COMBUSTION CONTROLS (TIANJIN) CO LTD
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Problems solved by technology
[0003] Among the various existing AC power fault monitoring methods, it is increasingly difficult to meet the actual requirements in terms of timeliness of fault monitoring
[0004] For example, in the Chinese patent with the publication number CN102385036B and the name "AC insurance failure detection method and circuit of uninterruptible power supply", a circuit and method for detecting the on-off failure of the insurance are disclosed. Although the circuit adopts dual optocouplers structure, but the rear end of the dual optocoupler structure uses a capacitor for capacitive rectification, so that the pulse signal is shaped into a level signal for sampling and detection; therefore, this circuit and method are prone to delay due to the introduction of capacitive rectification , and the rapidity of fault detection is poor
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[0036] For purposes of brevity and illustration, the principles of the invention are described herein primarily with reference to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to and may be implemented in all types of AC power failure detection and monitoring devices and / or AC power failure detection and monitoring methods, and any such changes without departing from the true spirit and scope of this patent application. Moreover, in the following description, reference is made to the accompanying drawings, which illustrate certain exemplary embodiments. Electrical, mechanical, logical and structural changes may be made to these embodiments without departing from the spirit and scope of the present invention. Furthermore, although a feature of the invention is disclosed in connection with only one of several implementations / embodiments, such feature may be combined with other implementati...
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The invention provides an AC power supply fault detection and monitoring device, and belongs to the technical field of power supply fault detection. The AC power supply fault detection and monitoring device comprises an optocoupler detection circuit and a fault monitoring module. The optocoupler detection circuit comprises a first optocoupler and a second optocoupler which access AC signals from an AC power supply in opposite directions; the fault monitoring module is coupled with the output ends of the first optocoupler and the second optocoupler of the optocoupler detection circuit; and the fault monitoring module is configured to judge whether the AC power supply has a power failure fault or not by utilizing a gap time period between the normal turning off of the first optocoupler and the normal turning on of the second optocoupler. The AC power supply fault detection and monitoring device is high in fault detection speed.
Description
technical field [0001] The invention belongs to the technical field of power supply fault detection, relates to the fault monitoring of an AC power supply, in particular to an AC power supply fault monitoring device using an optocoupler. Background technique [0002] AC power supply (such as 220V AC mains) supplies power to various devices. However, AC power supply may cause power failure due to various factors. Based on the needs of many electrical equipment, it is necessary to be able to detect the corresponding power failure in a timely manner. Faults, which are of great significance, for example, to protect electrical equipment. [0003] Among the various existing AC power fault monitoring methods, it is increasingly difficult to meet actual requirements in terms of timeliness of fault monitoring. [0004] For example, in the Chinese patent with the publication number CN102385036B and the name "AC insurance failure detection method and circuit of uninterruptible power s...
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IPC IPC(8): G01R31/42
CPCG01R31/42
Inventor 黄海龙雷刚方博
Owner HONEYWELL ENVIRONMENTAL & COMBUSTION CONTROLS (TIANJIN) CO LTD