Wide input range high efficiency voltage doubler ac/dc rectifier circuit for piezoelectric energy harvesting

Abstract

The invention provides a wide-input range, efficient and voltage-multiplying AC / DC (alternating current / direct current) rectifying circuit applied to piezoelectric energy gaining. The wide-input range, efficient and voltage-multiplying AC / DC rectifying circuit comprises a source input comparison circuit, a bulk-driven comparison circuit and a biasing circuit. The biasing circuit provides bias voltages. A synthetic input end of the source input comparison circuit is connected with a source of a NMOS (N-metal-oxide-semiconductor) and further in ground connection. A reverse input end of the source input comparison circuit is connected with a drain of the NMOS. An output end of the source input comparison circuit is connected with a grid of the NMOS. A synthetic input end of the bulk-driven comparison circuit is connected with a drain and a bulk of a PMOS (P-metal-oxide-semiconductor). A reverse input end of the lining drive comparison circuit is connected with a source of the PMOS. An output end of the lining drive comparison circuit is connected with a grid of the PMOS. After in series connection with a sampling capacitor, alternating voltage is connected with the reverse input end of the source input comparison circuit and the reverse input end of the bulk-driven comparison circuit respectively. After connected with an energy-storage capacitor, the synthetic input end of the bulk-driven comparison circuit is in the ground connection and outputs the rectifying voltages at two ends of the energy-storage capacitor.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a wide input range high-efficiency voltage doubler AC / DC rectifier circuit applied to piezoelectric energy acquisition. Background technique [0002] The key circuit modules of wireless energy harvesting technology include sensors, interface circuits and power load circuits. One of the most important parts of the interface circuit is the AC / DC rectifier circuit. The energy captured by the sensor is output in the form of an AC signal, which cannot supply power to the power load. Various AC / DC rectifier circuits with different structures are used to convert the AC signal into a stable DC output. Because the efficiency of AC / DC is crucial to the entire wireless energy harvesting circuit, how to improve the voltage conversion efficiency and power conversion efficiency has always been the direction of research. At the same time, in order to capture as much energy as possible...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this structure is that the voltage doubling function cannot be realized. The power supply voltage required by the comparator is high, so the minimum input voltage that can work normally is high. m 51 and M 52 The size design is usually large and consumes a lot of area. Two comparators are used at the same time, which generates a certain amount of power consumption and reduces the efficiency of rectification.

[0008] The disadvantage of this structure is that the voltage doubling function cannot be realized, and there are three conduction voltage drops of MOS transistors from input to output, and the voltage conversion efficiency is affected.

And in order to reduce the turn-on voltage drop of NVC, usually M 61 , M 62 , M 63 and M 64 The size of the large, which consumes a lot of area

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