Power failure detection circuit, power failure detection system and electric meter

• Main Authors: ZHANG YUMING, NIU YANMOU, XU JINGSHENG
• Format: Patent
• Language: Chinese; English
• Published: 30.06.2020
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The utility model provides a power failure detection circuit, a power failure detection system and an ammeter. A power failure detection circuit relates to the technical field of power failure detection and comprises a voltage reduction rectifying circuit, a voltage division circuit and a first power supply output circuit, the voltage division circuit and the first power supply output circuit areconnected with the voltage reduction rectifying circuit, and the voltage division circuit and the first power supply output circuit are both connected to an external control chip. The step-down rectification circuit is also connected with an external power supply to carry out step-down rectification processing on an alternating current signal input by the external power supply so as to obtain a direct current signal, and transmits the direct current signal to the first power supply output circuit so as to supply power to the external control chip; the voltage division circuit is used for carrying out voltage division