Parallel Resonant DC Link Inverter for Thermoacoustic Power Generation

ABSTRACT

A new parallel resonant soft-switching DC link inverter which can deal with the output power from thermoacoustic energy generation system is proposed. Auxiliary resonant unit is added to DC link to make DC bus voltage decreased to zero periodically, which realized all switches with zero voltage operation of in the inverter. The time of the duration for the DC bus zero voltage has nothing to do with the load current. The same bridge arm in the inverter is not made instantaneous short circuit and controlled reliably. Random duration of zero voltage was obtained through the on-off instant control of the auxiliary switch. Various flexible pulse width modulation strategies can be applied in the softswitching inverter. The topology structure is put forward and the circuit working principle is analyzed in this paper. The equivalent different working modes are analyzed and the mathematical equations are given. The principle of parameter design is put forward according to the circuit structure. The experiment is carried out and through it the validity and correctness of the theoretical analysis is proved.

Keywords:

DC-link, parallel resonant, thermoacoustic power generation, zero-current turn off, zero-voltage turn on.