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Dual-power switching circuit and Internet-of-Things chip by adopting same

A technology of dual power switching and power switching, which is applied in battery circuit devices, terminal battery switching devices, circuit devices, etc.

Inactive Publication Date: 2020-04-10
WUHAN RUINAJIE ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present application provides a dual power supply switching circuit and an IoT chip using the circuit to solve the problem of implementing a dual power supply switching circuit in the prior art

Method used

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  • Dual-power switching circuit and Internet-of-Things chip by adopting same
  • Dual-power switching circuit and Internet-of-Things chip by adopting same
  • Dual-power switching circuit and Internet-of-Things chip by adopting same

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Embodiment Construction

[0022] In order to enable those skilled in the art to better understand the solution of the application, the technical solutions in the embodiments of the application will be clearly described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are of the application. One example, not all examples. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

[0023] The term "comprising" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or unit...

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Abstract

The invention provides a dual-power switching circuit, belongs to the technical field of chip power management circuits, and particularly relates to a dual-power switching circuit and an Internet-of-Things chip by adopting the same. The dual-power switching circuit comprises a power switching circuit and a substrate voltage selection circuit. A first power supply is a power supply induced from anNFC field, a second power supply is a battery power supply, and the first power supply and the second power supply are in change. The power switching circuit switches the first power supply and the second power supply such that the output voltage is the greater of the two. The substrate voltage selection circuit receives the first power supply and the second power supply, and generates the substrate voltage of a PMOS device according to the first power supply and the second power supply. Therefore, the automatic dual-power switching circuit is realized. The Internet-of-Things chip also has thesame function.

Description

Technical field [0001] This application belongs to the technical field of chip power management circuits, and in particular relates to a dual power switching circuit and an Internet of Things chip using the circuit. Background technique [0002] IoT (Internet of Things, Internet of Things) chips are usually powered by batteries, but the voltage of the battery will decrease as the time of use increases. At the same time, the data needs to be updated after the production of IoT chip products. The IoT chip with NFC interface is In some application scenarios, NFC communication can be completed even when the battery is not powered. Therefore, an NFC (Near Field Communication) interface will be added to the IoT chip. The IoT chip needs to obtain power from the NFC interface. This requires a power switching circuit to achieve power switching. [0003] The existing power switching circuit uses a chip to identify the two power supply voltages, determine the level of the two power supply ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/36H02J7/00
CPCH02J7/0063H02J7/36
Inventor 龚明杨叶玉成王晓伟张明宇
Owner WUHAN RUINAJIE ELECTRONICS TECH
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