Preventing transformer saturation in bi-directional dual active bridge buck-boost DC/DC converters

Han, Sangtaek; Munuswamy, Imayavaramban; Divan, Deepak

doi:10.1109/ecce.2010.5618254

Cited by 40 publications

(17 citation statements)

References 4 publications

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“…A number of active approaches that are based on sensing of transformer currents and using sensed signals to modify duration of driving signals of the switches to maintain flux balance in unidirectional isolated converters have been introduced [13]- [15], whereas a methods of preventing transformer saturation in DAB converters have been introduced in [16], [17]. In [16], a fluxdensity transducer, called "magnetic ear," is employed to measure flux density in the core of the transformer and eliminate its dc component by an active flux-balancing control loop.…”

mentioning

confidence: 99%

“…This paper also offers an excellent review of existing direct and indirect sensing and measurement methods of the magnetic flux in the core of the transformer, as well as the review of passive and active methods of preventing core saturation. In [17], a method of preventing transformer saturation in Dual-Active-Bridge-Buck-Boost (DAB 3 ) converter has been proposed. In this active fluxbalancing method, the dc component of the primary and secondary current of the transformer are virtually eliminated by sensing the average primary and secondary current and injecting the signal proportional to their value into the sensed filter inductor current which by peak-current control adjusts and maintains the flux-balance of both the primary and secondary winding.…”

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confidence: 99%

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Novel transformer-flux-balancing control of dual-active-bridge bidirectional converters

Panov

Jovanovic

Irving

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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In this paper, a novel flux-balancing method for the isolated dual-active-bridge (DAB) bidirectional converter based on direct control of the magnetizing current is proposed. In the proposed method, the dc component of the primary and secondary current is controlled by providing two control loops; one to keep the average magnetizing current approximately zero and the other to keep the average primary and secondary current approximately zero. The performance of the proposed fluxbalancing control is experimentally evaluated on a 3.3-kW DAB prototype designed for automotive applications.978-1-4799-6735-3/15/$31.00 ©2015 IEEE

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confidence: 99%

mentioning

confidence: 99%

Novel transformer-flux-balancing control of dual-active-bridge bidirectional converters

Panov

Jovanovic

Irving

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…It should be noted that the dc blocking capacitors are used to prevent the magnetic saturation of the transformer. Actually, the saturation issue of the transformer is rarely studied in the literature, where the solutions include peak current control [9], magnetic ear [10,11], etc. But the peak current signal can be easily distorted by noise especially when the switching frequency is high, while the magnetic ear is composed of an auxiliary core and an extra circuit.…”

Section: Operation Principlementioning

confidence: 99%

A voltage doubler circuit to extend the soft-switching range of dual active bridge converters

Qin

Shen

Wang

et al. 2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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A voltage doubler circuit is realized to extend the soft-switching range of Dual Active Bridge (DAB) converters. No extra hardware is added to the DAB to form this circuit, since it is composed of the dc blocking capacitor and the low side full bridge converter, which already exist in DAB. With the voltage doubler, the DAB converter can achieve soft switching and high efficiency when the low side dc voltage is close to 2 pu (1 pu is the high side dc voltage divided by the transformer turn ratio), which can be realized only when the low side dc voltage is close to 1 pu by using the conventional phase shift modulation in DAB. Thus the soft switching range is extended. The soft switching boundary conditions are derived. A map to show the soft switching or hard switching in the full load and voltage range is obtained. The feasibility and effectiveness of the proposed method is finally verified by experiments.

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“…Several strategies for ensuring unbiased transformer flux density have been proposed [2,[6][7][8][9][10][11][12] whereby a classification and summary of these strategies is presented in [4]. This paper describes the implementation of a closed loop magnetic flux balancing scheme based on the concept proposed in [4], where a novel non-invasive flux density transducer, the "Magnetic Ear" together with the respective control loop was introduced.…”

Section: Introductionmentioning

confidence: 99%

Application of the magnetic ear for flux balancing of a 160kW/20kHz DC-DC converter transformer

Ortiz

Fassler

Kolar

et al. 2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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The non-ideal behavior of semiconductor devices used in power electronic circuits exciting a transformer can cause DC voltage components applied to the transformer terminals. This DC voltage in turn generates a DC current and/or DC flux density component only limited by the parasitic resistance of the windings and semiconductors. The biased flux density operation deteriorates the performance of the converter, since the core can be driven into saturation, generating higher currents and hence higher temperatures in the circuit. In order to overcome this problem, the previously reported "Magnetic Ear", a non-invasive flux density transducer concept, is used in this paper. The design, placement and all implementation issues for this flux density transducer are described. For verifying the theoretical considerations, the transducer is used to perform a closed loop control over the DC component of the flux density in the 166kW/20kHz transformer, therefore ensuring its unbiased magnetic flux density operation.

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Preventing transformer saturation in bi-directional dual active bridge buck-boost DC/DC converters

Cited by 40 publications

References 4 publications

Novel transformer-flux-balancing control of dual-active-bridge bidirectional converters

Novel transformer-flux-balancing control of dual-active-bridge bidirectional converters

A voltage doubler circuit to extend the soft-switching range of dual active bridge converters

Application of the magnetic ear for flux balancing of a 160kW/20kHz DC-DC converter transformer

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