Electric energy meter battery undervoltage monitoring device and monitoring method thereof

A technology of battery under-voltage and monitoring device, applied in measuring device, measuring current/voltage, measuring electricity, etc., can solve problems such as abnormal action, MCU driver, missed detection of voltage drop, etc., and achieve the effect of simple structure and low cost

CN111751780AInactive Publication Date: 2020-10-09MEASUREMENT CENT OF GUANGDONG POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an electric energy meter battery undervoltage monitoring device and a monitoring method thereof. The device comprises a power supply, a comparator and a latch; the power supplyis respectively connected with the comparator and the latch; a first input end of the comparator is connected with a resistance voltage division circuit of an electric energy meter internal battery,and the output end of the comparator is connected with a first input end of the latch; and the output end of the latch is connected with the signal input end of a MCU of the electric energy meter. Compared with the prior art, the latch is used for continuously latching a battery undervoltage signal until the battery undervoltage signal is detected, so that a battery undervoltage event can be accurately monitored, especially in the instantaneous voltage drop condition, and a battery undervoltage instantaneous signal can be captured in time; the monitoring device provided by the invention is simple in structure and relatively low in cost, can be applied to an internal circuit of an existing electric energy meter, and does not need to change existing design.
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Description

technical field

[0001] The invention belongs to the field of electric energy meter detection, and in particular relates to an electric energy meter battery undervoltage monitoring device and a monitoring method thereof. Background technique

[0002] With the construction and promotion of metering automation business in the power grid system, smart energy meters have been widely promoted. However, due to the large amount of outfield operation, energy meter battery undervoltage alarms often occur, and some of them are false alarms. , so it is necessary to provide a monitoring device capable of accurately monitoring battery undervoltage. The existing battery undervoltage detection circuit is designed inside the electric energy meter. During the operation, the main control chip (MCU) samples the battery voltage and records and uploads it. However, the structure of the traditional battery voltage detection circuit is relatively simple, and the work of the MCU inspection The meth...

Examples

Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] see figure 1 , this embodiment provides a battery undervoltage monitoring device for an electric energy meter, including a power supply, a voltage reference unit, a comparator, and a latch;

[0030] The power supply is powered by the main power supply VCC and the battery at the same time, using a power conversion chip with a wide input voltage range, which is connected to the comparator and the latch respectively, and the output voltage of the power sup...