A passive rfid reader battery power supply management device

Abstract

The invention relates to the field of an RFID wireless radio frequency technology, and especially relates to a battery power supply management apparatus of a passive RFID reader-writer. A battery charging management unit is connected with a battery pack unit, the battery pack unit is respectively connected with an MCU starting mode control unit, an MCU detection and control unit and a battery switching unit, the MCU starting mode control unit is connected with the MCU detection and control unit, the MCU detection and control unit is connected with an acousto-optic warning unit, the battery switching unit is connected with a current-limiting protection and switch circuit, the current-limiting protection and switch circuit is connected with an anti-current-backflow unit, and the anti-current-backflow unit is connected with a UHF reader-writer. According to the invention, four problems in the prior art are effectively solved, such methods of current-limiting protection, prevention of charging between batteries in a dual-battery power supply system, preventive protection of discharge after low-power of the batteries and the like are brought forward, the usability, reliability, stability and security of a system are effectively improved.

Description

technical field [0001] The invention relates to the field of RFID radio frequency technology, in particular to a passive RFID reader-writer battery power supply management device. Background technique [0002] With more and more fields of RFID application, more people feel the convenience and efficiency brought by RFID technology. RFID handheld terminals are used in many occasions, but in some occasions it is inconvenient for users to operate handheld terminals, coupled with the limitations of the performance of handheld terminals, more and more scenarios need to use fixed RFID readers. The so-called fixed reader means that the reader and antenna are fixed, and the tags are generally moving. In this usage scenario, a DC adapter is generally used to meet the power supply problem of the reader. However, some usage scenarios require the reader and antenna to be mobile, and it is not practical to use a DC adapter for power supply. Generally, the battery is used to directly sup...

AI Technical Summary

Problems solved by technology

In intelligent warehousing, cargo inventory and other occasions, the reader needs to be in a high-power card reading state for a long time, the working current is relatively large, and the battery life is limited.

[0005] 2. The indication of the battery status. In the existing technology, the battery is directly connected to the reader, and the reader starts to work. The user cannot know the power status of the battery. Generally, the power indicator light that comes with the reader is the only power indicator. , as long as the battery voltage is within the working voltage range of the reader, the indicator light will indicate normally

However, in practical applications, if the remaining power of the battery is only 20%, the reader can work normally after power-on, but the system cannot continue to work after the user uses it for a short time. This situation often occurs in use

The reason is that the user does not know the condition of the battery

[0006] 3. The charging and discharging management of the battery is unreasonable. Because the user does not know the battery power in the existing scheme, sometimes the remaining battery power is large, sometimes the remaining power is insufficient, and sometimes the battery is seriously over-discharged.

Affect the service life of the battery and the utilization rate of electric energy

[0007] 4. If the reader has a short-circuit fault or other faults, the battery will be discharged with a large current for a long time, and the battery will generate a lot of heat

In this case, the user cannot quickly know the abnormality of the reader, and there is no security measure, which poses a security risk

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