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This paper compares different space vector modulation (SVM) strategies for neutral-point voltage balancing (NPVB) control in three-level (3-L) T-type neutral-point-clamped (TNPC) inverters, and proposes an improved SVM trimmed for NPVB control in hybrid-switch-based 3-L TNPC inverter with the features of loss and common-mode voltage (CMV) reduction. The proposed SVM strategy uses a new principle of small vector selection and vector sequence, and thus, it can balance the neutral point (NP) potential and achieve soft-switching of clamping leg simultaneously. The paper includes detailed analysis for circuit commutation mode, loss breakdown, and common-mode voltage patterns under different operation conditions. The circuit simulations and experiments are carried out in the last part of this paper to validate the proposed SVM strategy. Index Terms-Electromagnetic interference (EMI), neutralpoint (NP) voltage balance, Si-SiC hybrid switch, space vector modulation (SVM), T-type neutral-point-clamped (TNPC) inverter, wide bandgap (WBG) devices.

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We present five circuit topologies for low power energy harvesting. The most efficient circuit uses a variable capacitor as the power source, a DC bias voltage to charge the variable capacitor, two transistors for rectification, and two storage capacitors. Varying the capacitance performs work and results in stored charge in the capacitors. We experimentally measure the storage capacitor voltage and current over time. The circuit efficiency nears 50% at a maximum power of 10 nW. Multiple circuit topologies are simulated and yield efficiencies from 15% to 50%.