Circuit and method for generating high voltage of defibrillator based on LLC resonant conversion

The invention discloses a defibrillator high voltage generation circuit and method based on LLC resonant conversion, and the circuit employs an LLC resonant control module which can control the working frequency of an LLC resonant converter to change in the same direction with the input voltage of an RFmin end, and is provided with a current feedback channel, a voltage feedback channel and a nonlinear adder to form the feedback input of the RFmin end. In the initial stage of the charging process of the energy storage capacitor C1, the working frequency changes in the same direction with a current feedback signal VI output by the current feedback channel, and the half-bridge LLC resonant converter carries out rapid constant-current charging on the energy storage capacitor C1 according to a charging current set value Iset so as to achieve the fastest charging speed and shorten the charging time of the energy storage capacitor C1; and at the later stage of the charging process, the working frequency changes in t