rfid supply and demand balance!Animal Microchip Sale

　　Floating charge power supply is another power supply method, and the floating charge power supply capacity is compatible with the discharge capacity. But they all have a common problem, that is, the power supply of UHF RFID passive tags needs to balance supply and demand.

　　Supply and demand balance power supply mode for burst communication

　　The current standard ISO/IEC18000-6 for UHF RFID passive tags is a burst communication system. For passive tags, no signal is transmitted during the receiving period. Although the carrier is received during the response period, it is equivalent to obtaining the oscillation source, so it can be considered as a simplex work. the way. For this kind of application, if the receiving period is used as the charging period for the energy storage capacitor and the response period is used as the discharging period for the energy storage capacitor, the equal charge and discharge amount of charge to maintain the balance of supply and demand becomes a necessary condition for maintaining the normal operation of the system.　　 According to the power supply mechanism of the above UHF RFID passive tags, the power supply of UHF RFID passive tags is neither a constant current source nor a constant voltage source. When the label energy storage capacitor is charged to a voltage higher than the normal operating voltage of the circuit, the power supply starts; when the label energy storage capacitor is discharged to a lower than the normal operating voltage of the circuit, the power supply is stopped.

　　For burst communication, such as the passive tag UHF RFID air interface, it can be charged enough before the tag sends a response burst, which is enough to ensure that a sufficient voltage can be maintained before the response is completed. Therefore, in addition to the strong enough radio frequency radiation that the tag can receive, the chip is also required to have a large enough on-chip capacitance and long enough charging time. The label response power consumption and response time must also be adapted. Because the distance between the tag and the reader is different, the response time is different, and the area of the energy storage capacitor is limited, it may be difficult to balance supply and demand with time division.

　　(2) Floating power supply mode for continuous communication

　　For continuous communication, in order to maintain uninterrupted power supply of the energy storage capacitor, it must be charged as it is discharged, and the charging speed is similar to the discharging speed, that is, the power supply capacity is maintained before the end of the communication.

　　Passive tag code division radio frequency identification and UHF RFID passive tag current standard ISO/IEC18000-6 have common characteristics. The receiving state of the tag needs to be demodulated and decoded, and the response state needs to be modulated and sent. Therefore, it should be designed according to continuous communication. Label chip power supply system. In order to make the charging speed close to the discharging speed, most of the energy received by the tag must be used for charging.

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