Power supply circuit for financial data reading equipment

Abstract

The invention provides a power supply circuit for financial data reading equipment. The power supply circuit comprises two switching tubes respectively corresponding to a main power supply branch anda standby power supply branch, a countercurrent protection circuit, a filter circuit and a time delay circuit. According to the invention, the two filter circuits are connected in parallel, and corresponding inductive reactance elements are respectively arranged corresponding to output parameters of different power supplies, so that charging and discharging are correspondingly carried out throughthe inductive reactance elements, delay filtering of power supply reference current is realized, and interference signals such as clutters, jitters or burrs generated in a power supply switching process are effectively inhibited and absorbed. Therefore, the power supply circuit provided by the invention can effectively suppress power supply noise, ensures stable power supply of financial data reading equipment, and avoids data reading and writing errors caused by abnormal power supply.

Description

technical field [0001] The invention relates to the field of financial technology, in particular to a power supply circuit for financial data reading equipment. Background technique [0002] Financial data reading equipment, such as IC card reading equipment, is equipped with digital integrated components such as MCU to realize data reading. In order to ensure the stable operation of the reading device, a backup power supply can be set for the reading device. [0003] However, when the existing financial data reading equipment switches between the main power supply and the backup power supply due to abnormal power supply, it is easily affected by the state change of the switching element and introduces interference signals such as clutter, jitter or glitches. If the interference signal cannot be eliminated in time, it will seriously affect the operation of MCU and other digital integrated components, making it impossible to accurately read and write IC card data, resulting ...

AI Technical Summary

Problems solved by technology

[0003] However, when the existing financial data reading equipment switches between the main power supply and the backup power supply when the power supply is abnormal, it is easily affected by the state change of the switching element and introduces interference signals such as clutter, jitter or glitches.

If the interference signal cannot be eliminated in time, it will seriously affect the operation of MCU and other digital integrated components, making it impossible to accurately read and write IC card data, resulting in data damage or loss; even, it can cause MCU misoperation or even failure

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