The utility model provides a wide region frequency conversion charging and discharging circuit that steps up. It includes frequency control and PWM controller output circuit, diode (D1), electric capacity (C1), resistance (R1), voltage buffer (U1A), MOS pipe (M1) and (M2), phase inverter (U3A), switch (K1) and (K2), buffer (U2A), power output inductance (L1), battery (BELL), voltage comparater (U4), PWM is by special PWM controller output, C1's fill discharge time is adjusted through diode D1, change the time that C1 went up voltage maintenance. The phase inverter is connected to U2A drive MOS pipe M2 through K1. M1 is complementary with the M2 wave form, when battery BELL voltage is less than VSET, and the K1 disconnection, M2 drives the shutoff, and the rectification is gone on through the internal diode of M2. K2 is closed, and the frequency converting circuit starts, changes the energy recuperation boost control that the duty cycle realized ultralow voltage through the frequency conversion. The utility model discloses but the wide application is in taking energy repayment type lithium cell partial volume equipment.