An X-Type Boost Multilevel Inverter Based on Switched Capacitor Cells With Low-Voltage Stress and High-Frequency Applications

Abstract

A novel X-type boost switched capacitor multilevel inverter utilizing a single power supply is proposed. It has a great application potential in the field of new energy power generation and high frequency scenarios. The proposed topology mainly has the following advantages. Firstly, the proposed topology avoids the use of H-bridge to output bipolar level, so that the maximum inverse voltage stress of the switch does not exceed 4Vdc. Secondly, the maximum switching frequency of the proposed topology is 3 times the fundamental frequency, which provides an opportunity for the application of the inverter in high frequency engineering. Thirdly, the charging of the bridge arm capacitors is synchronous, which simplifies the modulation strategy of the extended topology. Moreover, the operating principle of the topology was analyzed in detail, and the feasibility of the inverter and the correctness of the modulation strategy were verified.

A New High Step-Up SC-Based Grid-Tied Inverter With Limited Charging Spike for RES Applications

“…Regarding Table II, it can be seen that among other compared topologies, only the proposed inverter can limit the capacitor charging current spike of capacitors during charging mode. Compared with topologies of [16]- [18], [20], [22], [23], [25], and [29], the proposed inverter has the maximum value of power density. Considering Table II, from the point of CF/Nlevel, the proposed inverter has the minimum vale of this cost factor compared with all of topologies.…”

“…Considering Table II, compared with topologies of [15], [16], [19], [21], [24], [25], and [29], the proposed inverter has the minimum value of TSVpu. Also, the proposed inverter can provide the voltage boosting feature with a gain factor of 3, unlike the topologies of [16]- [20].…”

“…The seven-level SC-based multilevel inverters with a voltage gain of 1.5 have been presented in [15][16][17][18][19][20]. Also, the seven-level SC-based inverters with a voltage gain factor of 3 are proposed in [21][22][23][24][25]. The presented SC-based inverters in [21] and [15] need more than one input DC power supply, which makes them improper for certain applications.…”