Abstract
A passive soft-switching snubber with energy active recovery circuit (PSS-EARC) for pulse width modulation (PWM) inverters is proposed in this paper. The PSS-EARC recovers the buffering energy of the snubber inductors and capacitors back to the input voltage source while achieving passive soft-switching, so as to improve the inverter efficiency. In this paper, the configuration and operation principle of the PSS-EARC are analyzed and studied in detail firstly. Comparing with the traditional energy passive recovery circuit, the PSS-EARC avoids the circulating current issue by employing the auxiliary switches. Because the control of auxiliary switches is simple and independent, it is also benefit to the integration of auxiliary circuits. Moreover, in three-phase inverter application, the EARC is shared by three bridge-legs, which may further simplify the circuit. Finally, a 10kW three-phase inverter with the PSS-EARC is built. The experimental results demonstrate the validity and superiority of the proposed circuit.
Highlights
To reduce the size, cost, as well as power loss of the magnetic and filter components, it is necessary to increase the switching frequency of inverters
OPERATION PRINCIPLE The proposed circuit applied for inverter phase-leg shown in Fig. 1 consists of a passive soft-switching snubber (PSS) and an energy active recovery circuit (EARC)
The inverter efficiency will be improved. This circuit is shared by three bridge-legs when it is applied in three-phase inverters, which can greatly reduce the volume of the auxiliary circuit
Summary
Cost, as well as power loss of the magnetic and filter components, it is necessary to increase the switching frequency of inverters. OPERATION PRINCIPLE The proposed circuit applied for inverter phase-leg shown in Fig. 1 consists of a PSS and an EARC. This mode ends when the voltage vC12 across C12 is charged to Vin. At the same time, vL11 resonates to nearly Vb and vL12 resonates to nearly −Vb. 5) Mode IV (t3 − t4): at t3, D12 is turned on once again and C11 continues to discharge. The reverse recovery effect of the anti-parallel diodes of main switches and auxiliary diodes can be suppressed by the snubber inductors
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