Numerically-controlled linear voltage regulator power supply circuit and method

Abstract

The embodiment of the invention discloses a numerically-controlled linear voltage regulator power supply circuit and method. The power supply circuit comprises a power output stage, an analog-to-digital conversion module, a comparator and a digital-to-analog conversion module. The power output stage is used for receiving input voltage and sending output voltage to the analog-to-digital conversion module. The analog-to-digital conversion module is used for receiving the output voltage sent by the power output stage, conducting sampling and analog-to-digital conversion on the output voltage, converting the output voltage into a corresponding digital signal and sending the digital signal to the comparator. The comparator is used for receiving digitization reference voltage and the digital signal sent by the analog-to-digital conversion module, comparing the digitization reference voltage with the digital signal, generating an output signal and sending the output signal to a compensator and a transient response controller. The digital-to-analog conversion module is used for conducting digital-to-analog conversion on the output signal and inputting the converted signal into the power output stage. By means of the numerically-controlled linear voltage regulator power supply circuit and method, multi-voltage power supply can be achieved in a chip, output of the power output stage can be controlled precisely, and transient response of a numerically-controlled linear voltage regulator is improved.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification (Radio Frequency Identification, RFID) reader power management, in particular to a digitally controlled linear regulator power supply circuit and method. Background technique [0002] RFID technology is a non-contact automatic identification technology, which transmits signals through electromagnetic waves or inductive coupling to complete automatic identification of target objects. Radio signals transmit data from a tag attached to an item through an electromagnetic field tuned to a radio frequency to automatically identify and track the item. Some tags can get energy from the electromagnetic field emitted by the identifier during identification, and do not need batteries; there are also tags that have their own power supply and can actively emit radio waves (electromagnetic fields tuned to radio frequencies). Tags contain electronically stored information and can be ident...

AI Technical Summary

Problems solved by technology

However, the power supply design at the PCB board level is easy to introduce environmental noise, and additional pins are required for isolated power supply in multiple voltage domains, so it is necessary to implement multi-voltage power supply inside the chip

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