This paper presents a novel topology circuit to reduce the commutation torque ripple for brush1ess de motor(BLDCM). The topology circuit is composed of a unique capacitor, a switch circuit, a diode and a resistor. In the normal conduction period, the capacitor is charged, once the commutation occurs, the capacitor voltage is immediately added on the power supply by the switch circuit to regulate the dc-link voltage. Then the unique capacitor charged voltage is analyzed to keep the un-commutated phase current steady during the commutation period. The same two-phase modulation strategy is utilized in the both normal conduction period and commutation period, which simplifies the design of the modular. Compared with the boost strategy with DC/DC converters, the dc-link voltage is stepped up via a charged capacitor, and the boost function of the dc-link voltage is simply implemented. Without extra inductors, the voltage stress of the power switches is reduced to a larger extent. Finally, the effectiveness of the new topology circuit and control method is verified through simulation.