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A Novel Low-Loss Modulation Strategy for High-Power Bidirectional Buck Boost Converters

A Novel Low-Loss Modulation Strategy for High-Power Bidirectional Buck Boost Converters,10.1109/TPEL.2009.2015881,IEEE Transactions on Power Electroni

A Novel Low-Loss Modulation Strategy for High-Power Bidirectional Buck Boost Converters   (Citations: 13)
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A novel, low-loss, constant-frequency, zero-voltage-switching (ZVS) modulation strategy for bidirectional, cascaded, buck-boost DC-DC converters, used in hybrid electrical vehicles or fuel cell vehicles (FCVs), is presented and its benefits over state-of-the-art converters and soft-switching solutions are discussed in a comparative evaluation. To obtain ZVS with the proposed modulation strategy, the buck+boost inductance is selected and the switches are gated in a way that the inductor current has a negative offset current at the beginning and the end of each pulse period. This allows the MOSFET switches to turn on when the antiparallel body diode is conducting. As the novel modulation strategy is a software-only solution, there are no additional expenses for the active or passive components compared to conventional modulation implementations. Furthermore, an analytical and simulation investigation predicts an excellent efficiency over the complete operating range and a higher power density for a nonisolated multiphase converter equipped with the low-loss modulation. Experimental measurements performed with 12 kW, 17.4 kW/L prototypes in stand-alone and multiphase configuration verify the low-loss operation over a wide output power range and a maximum efficiency of 98.3% is achieved.
Journal: IEEE Transactions on Power Electronics - IEEE TRANS POWER ELECT , vol. 24, no. 6, pp. 1589-1599, 2009
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    • ...Further details about the control method are given in [17], and in [18], a similar structure is presented where the chip area is reduced by using snubbers, which however increase the circuit complexity and costs for the passive components...

    Juergen Bielaet al. SiC versus Si—Evaluation of Potentials for Performance Improvement of ...

    • ...They mainly consist in minimizing the circulating currents, thus minimizing conduction losses and operating the converters under soft switching to minimize switching losses [12]–[14]...

    Germán G. Oggieret al. Modulation Strategy to Operate the Dual Active Bridge DC–DC Converter ...

    • ...There are also high-efficiency noninverting buck–boost converters at higher operational voltages [12], [13] with the drawback of a complex control...
    • ...In [12], the authors state that the detailed modeling of the plant and the controller is an ongoing work...
    • ...Selecting n =1 , the dynamic characteristics of the output voltage and output current are continuous between the boost and buck modes, as shown in [12] and [13], but there is a double zero-pole cancellation indicating an uncontrollable internal dynamics...
    • ...The maximum efficiency obtained of about 97% would be improved if the diodes could be substituted by synchronous rectifier MOSFETs [12], [13]...
    • ...Other techniques like multiphase and zero voltage switching [12] or dynamic adjustment of the switching frequency [13] are also possible...

    Carlos Restrepoet al. A Noninverting Buck–Boost DC–DC Switching Converter With High Efficien...

    • ...Power loss characterization and modeling are topics with critical importance in power electronics design [1], [2]...
    • ...Thus, higher switching frequencies can be obtained that result in higher bandwidth, improved dynamics and smaller filter components [1]...
    • ...One of the most popular analytical switching loss models is the piecewise linear model [1], [4]...

    Federico Luchinoet al. MOSFET power loss characterization: Evolving into multivariate respons...

    • ...the cascaded buck+boost converter operated with the Constant-Frequency Zero Voltage Switching Quasi-Square-Wave (CF-ZVS-QSC) method [2][3] or the Constant-Frequency Zero Voltage Switching Modulation (CF-ZVS-M) [4]...
    • ...When the resonant transition completes, the second switch is turned on under ZVS [4]...
    • ...There exists an upper limit for the inductance L dependent on the specified peak power Pmax and the specified operating voltage range. A method to select L is given in [4]...
    • ...which are equal to 4.8W for the 100kHz CF-ZVS-M converter described in [4] where Ugs = 12V and 9.5W for the 50kHz SAZZ converter [10] where Ugs = ±12V...
    • ...The efficiency of the CF-ZVS-M and the SAZZ converter calculated based on the device parameters listed in Table I and the switch configurations given in the publications [4][10] is depicted in Fig. 13 along with the measured results...

    S. Waffleret al. Comparative evaluation of soft-switching concepts for bi-directional b...

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