Very low input voltage dc-ac conversion circuit for tiny energy harvesting

Abstract

The invention discloses an extremely-low-input-voltage direct-current (DC)-to-alternating-current (AC) converting circuit used for collection of little energy. The extremely-low-input-voltage DC-to-AC converting circuit used for the collection of the little energy comprises a transformer, a depletion type field effect transistor (FET), a first capacitor and a second capacitor. One end of a primary side of the transformer is connected with input DC voltage, the other end of the primary side of the transformer is connected with a drain electrode of the depletion type FET, one end of a secondary side of the transformer is connected with output voltage, and the other end of the secondary side of the transformer is grounded. The end, connected with the input voltage, of the primary side of the transformer and the end, connected with the output voltage, of the secondary side of the transformer are dotted terminals. A source electrode of the depletion type FET is grounded, and a grid electrode of the depletion type FET is connected with the output voltage. The first capacitor is connected in series between the input voltage and the ground, and the second capacitor is connected in series between the output voltage and the ground. According to the extremely-low-input-voltage DC-to-AC converting circuit, stray capacitance between the grid electrode and the source electrode of the depletion type FET is in parallel connection with the second capacitor, the capacitance after the parallel connection depends on the capacitance of the second capacitor, and therefore the resonant frequency of a system is enabled to be stable and controllable.

Description

technical field [0001] The invention belongs to the field of micro-energy collection, and in particular relates to a conversion circuit for transforming collected extremely low-voltage direct-current electric energy into larger-amplitude voltage alternating-current electric energy. Background technique [0002] In many cases, it is inconvenient or even impossible to power electronic devices using wired power supply or battery power supply. For example, a large number of wireless sensors in smart buildings are implanted in materials and walls. When the battery is exhausted, the battery cannot be replaced; in the field of agriculture, the wireless sensor used to detect the growth of crops requires a lot of manpower and material resources to replace the battery; For medical devices implanted in the body in invasive medicine, battery replacement may bring pain and risk to the human body. Therefore, "self-powered" devices that use energy harvested from the environment to be powe...

AI Technical Summary

Problems solved by technology

Electronic devices can be powered by converting thermal energy, solar energy, and vibration energy in the environment into electrical energy, but such energy harvesting methods usually have disadvantages such as too small energy density and discontinuous energy.

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