A boost circuit applied to a wireless transmission system

Abstract

The invention discloses a boosting circuit applied to a wireless transmission system. The circuit comprises a primary side circuit and a secondary side circuit. The primary side circuit comprises a power supply, a first pre-boosting inductor L1, a second pre-boosting inductor L2, a current inverter, a first electrolytic capacitor Cc, an LCL resonant circuit; The current inverter comprises a firstswitch tube Q1, a second switch tube Q1a, a third switch tube Q2, and a fourth switch tube Q2a. The secondary side circuit includes a series resonant circuit, a first diode D1, a second diode D2, a third diode D3, a fifth switching tube Qs, a second electrolytic capacitor Co, and a load. In the invention, a pre-boosting inductor is arranged on the primary side for supplying the current to the current inverter due to the soft switching required by the switching transistor, so that the conventional full-bridge inverter in the prior art does not need the equivalent load to be inductive so as to realize the soft switching.

Description

technical field [0001] The invention relates to the field of wireless power transmission, in particular to a booster circuit applied to a wireless power transmission system. Background technique [0002] Wireless power transmission system is an important part of the field of power electronics. At present, the research on wireless power transmission system is very extensive. In order to optimize the wireless power transmission system, researchers add more network topologies to the traditional compensation resonance method to improve the system. Efficiency, power and other performance. Among them, there is an LCL resonant network, which is composed of a resonant capacitor connected in parallel with a transmitting coil and then connected in series with a resonant inductor. Since the current on the transmitting coil is proportional to the input voltage and inversely proportional to the inductance of the coil, it is not affected by other parameters (such as load), so the LCL top...

AI Technical Summary

Problems solved by technology

However, simply connecting the boost circuit in series between the power supply and the inverter will significantly increase the size and cost of the power supply

In addition, if further boosting is required on the secondary side, most research is to add a boost boost circuit between the rectifier bridge and the load, but this will also lead to an increase in the volume of the secondary side

At present, there are few studies on the combination of boost network and semi-controlled rectifier boost circuit to achieve boost and soft switching in wireless power transmission systems

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