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Energy acquisition circuit for wearable equipment and power management circuit thereof

A wearable device, energy harvesting technology, applied in circuit devices, high-efficiency power electronic conversion, conversion equipment without intermediate conversion to AC, etc., can solve the problems of limited size scene, limited application of energy harvesting circuit, harsh preparation conditions, etc. , to improve the rectification efficiency, reduce the implementation cost, and improve the conduction angle.

Active Publication Date: 2020-06-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides an energy acquisition circuit for wearable devices and its power management circuit, which is used to solve the existing energy acquisition circuits for wearable devices due to the limitation of electromagnetic energy and the need to improve energy conversion efficiency Harsh preparation conditions lead to technical problems that limit the application of energy harvesting circuits

Method used

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  • Energy acquisition circuit for wearable equipment and power management circuit thereof
  • Energy acquisition circuit for wearable equipment and power management circuit thereof
  • Energy acquisition circuit for wearable equipment and power management circuit thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] An energy harvesting circuit for wearable devices such as figure 1 As shown, it includes an antenna and N cascaded master-slave charge pump units, and N is a positive integer; wherein, each master-slave charge pump unit includes an auxiliary charge pump and a main rectifier charge pump; the main rectifier charge pump is used to The threshold voltage of each rectifier switch is turned on, and the AC energy carried by the electromagnetic wave input by the antenna is converted into DC energy and doubled to realize energy acquisition; the auxiliary charge pump adopts a charge transfer switch structure to generate a threshold compensation voltage based on electromagnetic waves; The main rectifier charge pump is provided with a clamp tube, which is used to control the magnitude of the threshold compensation voltage generated by the auxiliary charge pump and provide it to the gates of each rectifier switch in the main rectifier charge pump to equivalently reduce the threshold v...

Embodiment 2

[0077] A power management circuit for wearable devices such as Figure 7 shown, including:

[0078] The sub-threshold bias generation circuit is used to quickly start the sub-threshold MOS under extremely low static power consumption based on the primary power supply voltage VCC generated by the energy harvesting circuit for wearable devices as described in the first embodiment above. The tube and its constituent circuits generate a reference voltage VREF that has nothing to do with the primary power supply voltage VCC and the ambient temperature;

[0079] The LDO circuit based on the sub-threshold amplifier is used to filter the ripple of the primary power supply voltage VCC with ripple output by the energy harvesting circuit through a negative feedback loop control based on the reference voltage VREF to obtain a smaller ripple and a higher The stable secondary power supply voltage VDD is used to supply power to the functional circuit modules at the back end of the power man...

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Abstract

The invention belongs to the field of wearable equipment energy supply, and particularly discloses an energy acquisition circuit for wearable equipment and a power management circuit thereof. An auxiliary charge pump is introduced into each stage of charge pump in the energy acquisition circuit; the auxiliary charge pump adopts a charge transmission switch structure and is used for generating threshold compensation voltage based on electromagnetic waves and controlling grids provided for main rectification switches in the main rectification charge pump through a clamping tube so as to reduce the threshold voltage of the main rectification charge pump; the power supply management circuit comprises a sub-threshold bias generation circuit which is used for starting and generating reference voltage VREF irrelevant to VCC and environment temperature based on VCC. The LDO circuit based on the sub-threshold amplifier performs filtering of ripple waves for VCC based on VREF in a sub-thresholdstate, and secondary power supply voltage VDD is obtained. The circuit is high in energy conversion efficiency, low in manufacturing cost, suitable for various electromagnetic wave energy environmentsand high in practicability.

Description

technical field [0001] The invention belongs to the field of energy supply for wearable devices, and more particularly relates to an energy acquisition circuit and a power management circuit for wearable devices. Background technique [0002] At present, major manufacturers at home and abroad are scrambling to launch wearable devices. These wearable devices have multiple functions, such as basic medical functions such as monitoring heart rate / blood pressure, and have established a basic medical large database for health guidance. However, with the increasing requirements for data capacity, real-time performance, and security, it is difficult to reduce the power consumption of wireless transceivers based on phase-locked loop structures, and the service life of wearable and implantable medical devices is required to be maintained at more than 10 years , wearable devices face the problem of limited battery capacity. Secondly, the conversion efficiency PCE (Power Conversion Eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/20H02M3/07H02M1/14
CPCH02J50/20H02M3/073H02M1/14H02M1/0045H02M1/0048H02M3/077Y02B70/10
Inventor 刘冬生金子睿鄢奉赜苏彦文
Owner HUAZHONG UNIV OF SCI & TECH
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