Method for monitoring battery capacity of electric energy meter
A battery capacity and energy meter technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as affecting the accuracy of the on-site energy meter clock and inability to judge the battery, etc.
Inactive Publication Date: 2018-06-22
NANJING DIANRUN TECH
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Problems solved by technology
However, a considerable part of the watt-hour meters operating on site will run out of battery power after about 3 years of operation, thus affecting the clock accuracy of the on-site watt-hour meters.
Because the existing electric energy meter scheme does not monitor the power consumption of the battery, it is impossible to judge whether it is a problem in the design of the scheme or a quality problem in the battery itself that causes the battery to run out of power. At present, there is no equipment without increasing hardware costs It can estimate the remaining power of the battery in time, so as to effectively prevent the battery from affecting the operation of the equipment
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[0013] The present invention will be further described below in combination with specific embodiments.
[0014] Such as figure 1 As shown, the monitoring method of the battery capacity of the electric energy meter is to connect a resistor R in series near the negative pole of the battery in the battery output circuit, and lead a sampling signal line to the AD sampling port of the single-chip microcomputer on the pin of the resistor R close to the negative pole of the battery. The single-chip microcomputer takes S as the sampling period through the software, the voltage on the sampling resistor R is Vn, and the sampling times are N times. The output power of the battery in N sampling periods is calculated through the output power calculation formula, and the remaining power of the battery is further calculated.
[0015] The formula for calculating the output power is (V1+V2+…Vn) / R*N*S.
[0016] Remaining power = factory nominal capacity of the battery - (V1+V2+...Vn) / R*N*S. ...
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The invention discloses a method for monitoring the battery capacity of an electric energy meter. In the battery output circuit, a resistor R is connected in series near a negative pole of a battery,and a sampling signal line is drawn to an AD sampling port of a single chip microcomputer from a pin close to the negative pole of the battery, of the resistor R. The single-chip microcomputer uses the software, takes S as the sampling period to sample the voltage of the resistor R; the voltage of the resistor R is Vn, and the number of sampling times is N. The output power of the battery in the Nsampling periods is calculated by the output power calculation formula, and the remaining battery power is further calculated. The invention provides a method for monitoring the battery capacity of the electric energy meter, which can avoid increase in the hardware cost, is accurate in calculation, can prompt a user to replace the battery, and can determine the failure of the electric energy meter.
Description
technical field [0001] The invention belongs to the field of monitoring equipment, and more specifically relates to a method for monitoring battery capacity of an electric energy meter. Background technique [0002] In the existing electric energy meter design, when there is no mains power, the battery is used as a backup power supply to supply power to the chip to ensure that the clock of the electric energy meter can operate normally. According to the calculation of the 1200mAh capacity Li-sub-battery stipulated by the current national grid enterprise standard, the battery can meet the requirements of at least 5 years of operation. However, a considerable part of the electric energy meters operated on site will run out of battery power after about 3 years of operation, thus affecting the clock accuracy of the electric energy meters on site. Because the existing electric energy meter scheme does not monitor the power consumption of the battery, it is impossible to judge wh...
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IPC IPC(8): G01R31/36
CPCG01R31/3646
Inventor 周旋沈镇炜朱蓬辉滕世玉朱朦朱海双
Owner NANJING DIANRUN TECH