Gas meter with lithium battery electric quantity monitoring function

Abstract

The invention provides a gas meter with a lithium battery electric quantity monitoring function, which comprises a gas meter body and a gas meter lithium battery electric quantity monitoring circuit arranged in the gas meter body, the gas meter lithium battery electric quantity monitoring circuit comprises a battery voltage sampling circuit, a direct current power conversion circuit, a battery load pulse excitation circuit and an MCU control circuit. And the battery voltage sampling circuit, the direct-current power conversion circuit and the battery load pulse excitation circuit are connected with the MCU control circuit. According to the gas meter with the lithium battery electric quantity monitoring function, the lithium battery electric quantity is monitored through the gas meter lithium battery electric quantity monitoring circuit; the integration level is high and the cost is low.

Description

technical field [0001] The invention relates to the field of gas meters, in particular to a gas meter with a lithium battery power monitoring function. Background technique [0002] At present, the mainstream manufacturers of lithium battery power monitoring in the domestic gas metering industry adopt the collection of lithium battery voltage. % electricity) voltage ratio, to calculate the method of electricity. This method is relatively reliable when the lithium battery is fully charged or fully charged. However, when the lithium battery enters the low-power stage due to some environmental reasons (moisture, passivation, etc.) or actual use, the drawbacks of this method are obvious. At this time, the method of using voltage acquisition to represent the battery power will be seriously inadvisable. When the gas meter usually sleeps or performs simple measurement and data storage, the battery voltage collected by the ADC inside the MCU chip will remain at a high level, and ...

AI Technical Summary

Problems solved by technology

[0004] 1. If you use a power monitoring IC, you need to establish a battery charge and discharge model, and the lithium battery in the gas meter is a disposable lithium battery, so it is difficult to establish a charge and discharge model. Difficulty increases greatly;

[0005] 2. The price of power monitoring IC is more than a dozen yuan, which is extremely difficult to use for products that are extremely price-sensitive, such as gas meters;

[0006] 3. The power monitoring IC is working all the time to ensure the accuracy of power measurement. The power consumption of the lithium battery itself is also a big expense for the power monitoring IC itself. stability, and even reduce the service life of the product

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