DYNAMIC RECTIFICATION CONTROL CIRCUIT AND PASSIVE RFID, AND DYNAMIC RECTIFICATION CONTROL METHOD

摘要

A dynamic rectification control circuit (1), comprising: a resonant capacitor (C1) which is connected in parallel between a first antenna terminal (in1) and a second antenna terminal (in2) together with a resonant inductor (L) and used for forming a resonant circuit together with the resonant inductor to receive an external electromagnetic field and couple same to a rectification circuit (2); a rectification circuit, wherein input ends thereof are connected to the first antenna terminal and the second antenna terminal, which is used for converting an alternating-current power source coupled by the resonant circuit into a direct-current power source (Vdd_out) and outputting same and providing a power source for an amplitude limiting circuit, and at the same time, one path of an output end thereof is connected to the ground (GND), which is used for outputting the charge to the ground when the field intensity is too strong; and an amplitude limiting circuit, wherein a power source input end thereof is connected to a power source output end (V1) of the rectification circuit, and an output end (VR) thereof is connected to a control input end of the rectification circuit. When the voltages of the antenna terminals are too high, the dynamic rectification control circuit can conduct through the grounded path, so that the charges of the antenna terminals are output to the ground, and the quantities of electric charges of the antenna terminals are reduced, thereby reducing the rectified direct-current voltage. The dynamic rectification control circuit can prevent an over-voltage from damaging a load circuit, and can also prevent the occurrence of a phenomenon where the reception of a card reader terminal is saturated at the same time. In addition, also provided are a passive RFID comprising the dynamic rectification control circuit, and a method for performing dynamic rectification control on the circuit using the passive RFID.