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An energy harvesting circuit and its power management circuit for wearable devices

A wearable device and power management technology, which is applied in the direction of circuit devices, high-efficiency power electronic conversion, and conversion equipment without intermediate conversion to AC, etc. It can solve the problems of large and small scene restrictions, harsh preparation conditions, and limited application of energy harvesting circuits. , to achieve the effect of reducing static power consumption and ultra-low power consumption

Active Publication Date: 2022-03-25
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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  • An energy harvesting circuit and its power management circuit for wearable devices
  • An energy harvesting circuit and its power management circuit for wearable devices
  • An energy harvesting circuit and its power management circuit for wearable devices

Examples

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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, where N is a positive integer; wherein, each master-slave charge pump unit includes an auxiliary charge pump and a master rectifier charge pump; the master 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 achieve 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 clamping 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 rectification charge pump to reduce the threshold v...

Embodiment 2

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

[0078] A 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 a wearable device as described in the first embodiment The tube and its constituent circuit generate a reference voltage VREF independent of the primary power supply voltage VCC and ambient temperature;

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

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Abstract

The invention belongs to the field of energy supply for wearable devices, and specifically discloses an energy acquisition circuit and a power management circuit for wearable devices. Each charge pump in the energy acquisition circuit introduces an auxiliary charge pump; the auxiliary charge pump adopts charge transmission The switch structure is used to generate the threshold compensation voltage based on the electromagnetic wave, and provide it to the gate of each main rectifier switch in the main rectifier charge pump through the control of the clamp tube, so as to reduce the threshold voltage of the main rectifier charge pump; the power management circuit includes: sub-threshold The bias generation circuit is used to start based on VCC and generate a reference voltage VREF that is independent of VCC and ambient temperature; the LDO circuit based on the sub-threshold amplifier filters the ripple on VCC based on VREF in the sub-threshold state to obtain the secondary power supply voltage VDD . The circuit of the invention has high energy conversion efficiency, low manufacturing cost, is suitable for various electromagnetic wave energy environments, and has strong 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 for wearable devices and a power management circuit thereof. Background technique [0002] At present, major domestic and foreign manufacturers are rushing to launch wearable devices. These wearable devices have various functions, such as basic medical functions such as monitoring heart rate / blood pressure, and have established a basic medical database for health guidance. However, with the increasing requirements for data capacity, real-time, and security, it is difficult to reduce the power consumption of wireless transceivers based on phase-locked loop structures, while the service life of wearable and implantable medical devices is required to be maintained for more than 10 years. , wearable devices face the problem of limited battery capacity. Secondly, the conversion efficiency PCE (Power Conversion Efficiency...

Claims

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Application Information

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Patent Type & Authority Patents(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