Variable on-resistance switching device for boost converters for thermoelectric energy harvesting

Abstract

The invention belongs to the field of microelectronics science and technology, and in particular relates to a variable on-resistance switching device of a boost converter used for obtaining thermoelectric energy. The maximum power point tracking circuit is connected with the low-side switch control circuit; the low-side switch control circuit is connected with the logic AND gate drive circuit; the high-side switch detection comparator is connected with the logic AND gate drive circuit; the power supply voltage detection circuit is connected with the logic AND gate drive circuit a logic AND gate drive circuit; the logic AND gate drive circuit is connected to the variable on-resistance switch circuit for obtaining a high-side control signal and a low-side control signal according to the low-side input signal, the high-side input signal and the voltage detection signal ; The variable on-resistance switch circuit is used to control the switch on or off according to the control signal. In the embodiment of the present invention, the digital logic circuit controls the output control signal to control the on / off of the resistor switch of the converter, thereby reducing the loss and effectively reducing the cold start voltage of the boost converter.

Description

technical field [0001] The invention belongs to the field of microelectronic science and technology, and in particular relates to a variable on-resistance switch device of a step-up converter used for thermoelectric energy acquisition. Background technique [0002] In recent years, smart wearable devices based on WBAN (Wireless Body Area Network) have become a hot research topic. Due to the limitations of size and reliability, traditional lithium battery power supply has become a bottleneck for the user experience of smart wearable devices. Thermoelectric generators, single solar cells and fuel cells have great potential in this regard. However, these energy sources usually only provide a very low voltage and low power. A boost converter can effectively solve this problem. [0003] Generally, the power provided by the energy source used in the wireless sensor is low, which reduces the load power of the converter. How to improve the conversion efficiency of the converter be...

AI Technical Summary

Problems solved by technology

In a traditional boost converter, due to the on-resistance of the high-side switch HS Switch and the low-side switch LS Switch, there is inevitably switching loss in the boost converter, which reduces the conversion efficiency of the boost converter

At the same time, the on-resistance of the switching circuit of the traditional boost converter is a constant value, which cannot adapt to different power supply voltages, and cannot maximize the conversion efficiency under all power supply voltage conditions.

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