A High Efficiency Fully Integrated ac‑dc Converter

Abstract

The invention discloses a high-efficiency totally-integrated AC-DC converter which comprises a first AC signal input port, a second AC signal input port, a first linear voltage stabilizer, a second linear voltage regulator, a grounding output port, a DC output port and a three cross-gate structure self-control rectifier formed by transistors from the first transistor to the sixth transistor. According to the high-efficiency totally-integrated AC-DC converter, the rectifier and the voltage stabilizer are combined, so that a large capacitor after the rectifier is avoided, output capacitance is small, integration is easy and output ripple is small; and the high-efficiency totally-integrated AC-DC converter comprises the three cross-gate structure self-control rectifier, and the three cross-gate structure self-control method is used to replace a multiplexer, so that impulse wave signals generated by the multiplexer are not needed, the problem of reverse current leakage of an active diode structure is solved, and conversion efficiency is ensured. The high-efficiency totally-integrated AC-DC converter can be widely applied to the technical field of an integrated circuit.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a high-efficiency fully integrated AC-DC converter. Background technique [0002] Wireless power transmission technology based on inductive coupling is more and more widely used in systems where batteries are inconvenient to use or cannot be installed due to factors such as battery size, service life and cost control, such as biomedical implants, radio frequency identification tags and Short-range wireless communication equipment, etc. This energy self-excitation system based on inductive coupling usually includes three parts: reader, induction coil and transponder. The transponder acquires the carrier signal sent by the reader through the induction coil, and converts the AC signal into a DC voltage through the AC-DC converter. The block diagram of a traditional wireless power transfer system is as follows: figure 1 As shown, usually the AC-DC converter includes tw...

AI Technical Summary

Problems solved by technology

In fact, one of the main problems affecting its efficiency under this structure is the synchronization of transistors: when the load is large, the transistor needs to be designed with a large size to meet the requirements of current density and efficiency, but the gate capacitance of a large-sized transistor is relatively large. Large, resulting in a long charge and discharge time, so the rectifier is easy to form a relatively long reverse conduction path at high frequency, which affects the efficiency of the rectifier

However, in this structure, the input signal of the operational amplifier is a pulse wave signal generated by a multiplexer, which is similar to the driving signal of a DC-DC converter switch tube, so the output will have relatively large noise

Secondly, the structure is essentially an active diode driven by an operational amplifier. When the frequency is high, the operational amplifier has an offset (offset), which leads to the formation of leakage current and further reduces the conversion efficiency.

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