A multi-stage multi-output power management circuit

Abstract

The embodiment of the invention discloses a multistage multiple output power management circuit. The management circuit comprises a DC-DC module, a second stage voltage stabilization module and a third stage power supply module, wherein the DC-DC module is used for outputting a first stage power supply voltage, and a primary power supply source is provided for the second stage voltage stabilization module through the outputting of the first stage power supply voltage; the second stage voltage stabilization module is used for receiving the first stage power supply voltage and outputting a second stage power supply voltage; the third stage power supply module is used for receiving the second stage power supply voltage and outputting voltage supply and power supply. According to the embodiment of the multistage multiple output power management circuit, no extra pins used for isolation power supply of multiple voltage domains are needed to be provided, on the basis of a normal power supply voltage, multiple models in a reader support low power consumption model of ultra-low power supply, the ultra-low voltage power supply is achieved, and environment noise is avoided being introduced into in the power supply process.

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 multi-stage multi-output power management circuit. 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 identified within a few m...

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 of multiple voltage domains

Therefore, it is necessary to implement multi-voltage power supply inside the chip, and the existing circuit cannot meet the needs of multi-voltage power supply

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