DCM PFC Converter With Harmonic Modulation Technique

Unique—This paper proposes another contender for high power installed charger for electric vehicles. It depends on a intermittent conduction mode (DCM) power element rectification (PFC) converter with symphonious tweak method that moves forward the force element in DCM PFC operation and a two-phase dc/dc converter made out of a full converter and a DCM buck converter. Isolating the elements of the dc/dc stage into control and seclusion diminishes the transformer by utilizing high-recurrence reverberation. The possibility of the proposed charger has been confirmed with a 6.6-kW model.

In this paper, another structure to expand power thickness and decrease control many-sided quality is proposed in light of an irregular conduction mode (DCM) PFC converter and a two-phase dc/dc converter. The DCM operation in the PFC stage can give little inductor size and straightforward control, however it experiences a low PF. To take care of this issue, a consonant balance strategy is created to build the PF. Utilizing a consonant balance component, the inductor current can be twisted all together for the information current to have a sinusoidal waveform. 

The proposed strategy has been streamlined with the goal that it can be executed with a straightforward control calculation. In the dc/dc organize, another idea of a disengaged dc/dc converter made out of two phases with the hard-exchanged buck converter for charging control and the unregulated LLC converter for electrical disengagement and voltage enhancement is received . By isolating capacities, the unregulated LLC converter can be intended to have an ideal exchanging trademark paying little heed to load conditions so that the exchanging recurrence can be expanded without an unreasonable power misfortune and wide charging voltage can be expert utilizing the buck converter. To check the plausibility, the proposed circuit has been executed and tried utilizing a 6.6-kW charger with full computerized control. The model charger has been outlined with the accompanying determinations:
1) lattice attributes: 6.6 kW/30 A/60 Hz;
2) greatest yield power: 6 kW;
3) info voltage: 90−264 Vrms;
4) charging voltage: 250−450 V.
To outline the charger under all inclusive line voltages, a few data of the greatest yield power under the line voltage changes and charging profile is required. Demonstrates the yield power limit chart as per line voltages expecting that the charger has 90% productivity. Appears the charging profile of the model outline. The charging mode is changed from steady present (CC) mode to consistent power (CP) mode at the limit point The exchanging frequencies of the resounding converter, PFC help converter, and buck converter are chosen as fsr = 100 kHz, fsp = 50 kHz, and fsb = 50 kHz to diminish the arbitrary clamors by synchronizing the operations of two converters. Demonstrates the most extreme help inductor values as per the information voltage changes with and the charging profile. The connection voltage has been utilized as 420 V .

The envelope of help inductor current is contorted due to the symphonic tweak consider yet line streams take after the line voltage waveform well. Likewise, LLC switches are all around worked under ZVS condition. At the point when BMS transmits an unexpected charge summon to the charger, the charger changes the order with a moderate incline all together not to have unusual transient of charging current. Additionally, the operational recurrence of the LLC converter changes from a high recurrence of 300 kHz to an objective recurrence of 100 kHz to decrease over the top full current amid start-up transient.


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