Charge Characteristics by Exciting-Axis Voltage Vibration Method in Boost Driver With EDLCs

Charge-pumping boost driver (CPBD) with electric double-layer capacitors (EDLCs) was proposed by the author. CPBD has advantages over conventional drivers. However, CPBD comprises a charge circuit, including an inductor to charge the EDLCs, which increases size and cost of CPBD. This problem led to the proposal of noncharge-circuit charge-pumping boost driver (NCPBD) with EDLCs. NCPBD can be realized in a smaller and more reasonable configuration than CPBD because NCPBD does not comprise the charge circuit. In this paper, an EDLCs charge method, exciting-axis voltage vibration method (EVVM), is proposed for NCPBD. EVVM enables NCPBD eliminating the charge circuit to charge the EDLCs. Additionally, EVVM can work even in a motor standstill and in a constant speed drive. The charge performance by EVVM is experimentally confirmed to be sufficiently well. Additionally, the drive performance during the charge operation is proved not to degrade. From the experimental results, the charge characteristics of EVVM are reported. Then, these charge characteristics introduce a charge strategy. Finally, the charge experiment adopting the strategy confirms that EVVM enables NCPBD to drive the motor without decreasing the EDLCs voltage in an acceleration and deceleration drive.