| 摘要 |
The present invention relates to the technical field of wireless charging and discloses a magnetic resonant wireless charging circuit. The magnetic resonant wireless charging circuit comprises: a high frequency oscillator circuit (11) for generating an initial oscillator signal; and a drive circuit (12) for adopting the initial oscillator signal. The drive circuit comprises 1-stage drive subcircuit (121) or an n-stage drive subcircuit (121) and an (n-1)-stage DC-blocking circuit (122) connected in series alternatingly, where n ≥ 2, and n is an integer. Each stage of the drive subcircuit comprises a frequency-doubling circuit (121a) and a first frequency selective circuit (121b) connected in series. The wireless charging circuit doubles the frequency of the initial oscillator signal generated by the high frequency oscillator circuit, and thus increases the frequency of a transmitted signal, thereby ensuring the distance of transmission of the transmitted signal and therefore the effect of wireless charging. The requirements on switching transistors can be lowered when the frequency needed for transmitting signals achieves a certain value, and therefore low-priced switching transistors can be used to obtain a good effect of a wireless charging circuit, thus reducing the manufacturing cost of the wireless charging circuit. |
