Elimination of magnetic saturation due to fast dynamic response in DC-DC converter

Kohama, Takeshi; Tokimatsu, Sunao; Shimamori, Hiroshi

doi:10.1109/intlec.2009.5351916

Cited by 12 publications

(8 citation statements)

References 7 publications

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“…To suppress the DC bias and prevent transformer from entering saturation state, a voltsecond product error integral feedback control mode is proposed in this paper. Different from the traditional current feedback control mode in Reference [15][16][17][18][19][20][21][22][23][24], the trigger condition of this feedback control mode is the Integral Value of Volt-Second Product Error e IVVSPE , and the DC bias suppression strategy can be triggered before transformer enters the saturation state. When (e IVVSPE ) N ≥ MIVVSPE + , the positive DC bias suppression strategy will be triggered.…”

Section: Proposed Suppression Strategymentioning

confidence: 99%

“…In order to solve this problem, various methods have been proposed, which can be divided into hardware topology optimization method [10][11][12][13][14] and software optimiza-tion method [15][16][17][18][19][20][21][22][23][24]. The hardware topology optimization method is to improve the anti-DC bias ability by adjusting the structure and parameters of the hardware topology, which belongs to the active suppression method.…”

Section: Introductionmentioning

confidence: 99%

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A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

Zhou

Zheng

et al. 2021

Electronics

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The high frequency transformer in single-phase full-bridge DC-DC converter is prone to saturation because of the asymmetry of circuit parameters. Transformer saturation will increase power consumption, accelerate the aging of winding insulation, and even damage power switches. In order to prevent this risk, a DC bias suppression strategy is presented in this article, and the main advantage of this strategy is that the problem of transformer saturation can be completely eliminated. In this article, firstly, the DC bias and saturation mechanism of single-phase full-bridge DC-DC converter are analyzed in detail, and the Maximum Integral Value of Volt-Second Product error (MIVVSPE) is derived. Secondly, aiming at the saturation problem of single-phase full bridge DC-DC converter, a new digital integral circuit is designed to evaluate the DC bias state of transformer, and a DC bias suppression strategy is constructed to suppress the saturation of transformer. Furthermore, different from the traditional current feedback control strategy, the DC bias suppression strategy based on volt-second product error integral can be triggered before the transformer enters the saturation state, and the transformer saturation can be completely suppressed. Finally, a 30 kW single-phase full-bridge DC-DC converter for arc welding is established in lab. The experimental results show that the new DC bias suppression strategy can effectively prevent the transformer from entering the saturation state and improve the operation stability of single-phase full-bridge DC-DC arc welding inverter.

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Section: Proposed Suppression Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

Zhou

Zheng

et al. 2021

Electronics

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“…From Equations (14)(15)(16)(17), the MFDB accumulation of positive direction can be expressed as Similarly, the MFDB accumulation of negative direction can be expressed as…”

Section: Deduction Of the Maximum Mfdbmentioning

confidence: 99%

“…In addition, noise is usually introduced at the moment when switches are turned on, making the accuracy of the sampling value undependable. Some other solutions have been proposed in [17,18]. In [17], the dc bias of the transformer is controlled by modulating the duty cycle.…”

Section: Conventional Solutions To Eliminate Flux Density Biasmentioning

confidence: 99%

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Magnetic flux density bias analysis and suppression strategy for voltage‐fed single‐stage full‐bridge converter

Zhang

Qian

et al. 2016

Circuit Theory & Apps

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Power transformer in the voltage-fed single-stage full-bridge (SSFB) converter is easy to be saturated because of the special operating mode of this topology. First and foremost, detailed analysis about the generation mechanism of the transformer saturation in the voltage-fed SSFB converter is presented for the first time in this paper. Second, the mathematical expression of the maximum value of magnetic flux density bias (MFDB) during every line cycle is deduced. Furthermore, a novel suppressing strategy, consisted of the digital compensating algorithm and design considerations, is proposed based on the theoretical analysis and mathematical expression. The MFDB can be eliminated and additional circuits are not needed with the proposed strategy. Finally, a 1 kW prototype with the voltage-fed SSFB topology is built to verify the effect of the proposed approach. The voltage-second imbalance is reduced to less than 1% using the proposed suppression strategy compared with 14% when the strategy is not used. Consequently, the system reliability and the efficiency are improved. research is seldom studied comprehensively. In [10], the flux density bias problem is mentioned, and a protection circuit is used to limit the maximum magnetizing current. Detailed theoretical analysis is not involved, and the efficiency is still affected.In this paper, the generation principle of the MFDB is analyzed in detail. Then the mathematical expression of the maximum MFDB is deduced. Based on these theoretical analyses, a novel strategy is developed to avoid the transformer saturation in the voltage-fed SSFB converter. The paper is organized as follows. In Section 2, the principle of flux density bias generation is analyzed. Besides, the maximum MFDB is calculated in this section. Section 3 gives several conventional solutions for suppressing the MFDB. The proposed suppressing strategy including design consideration is presented in Section 4. In Section 5, a 1-kW prototype with voltage SSFB topology is built and tested. With the proposed strategy, the system reliability is improved, and the efficiency is increased. The conclusions are given in Section 6. GENERATION MECHANISM OF THE MFDBThe circuit diagram of the voltage-fed SSFB converter is shown in Figure 1. The two bridge legs of the full-bridge converter are composed of four transistors, Q 1 , Q 2 , Q 3 and Q 4 , in which, Q 2 and Q 4 are also used to perform the same current-shaping function as the switch in a boost converter. Components D S1 , D S2 , L 1 and L 2 make up a semi-bridgeless converter. The power transformer T r , resonant inductance L r (including the leakage inductance), output rectifier diodes D R1 and D R2 , output filter inductance L O and capacitance C O make up a standard full-bridge converter [11][12][13]]. An energy store capacitor C F is placed across the primary-side dc bus. MFDB generation mechanismThe MFDB occurs when the voltage-second balance of the magnetizing inductance is not achieved. Actually, this phenomenon may occur in most full-bridge converter b...

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Implementation of digitally controlled phase shift full bridge converter for server power supply

Cho

Seong

Jung

et al. 2010

2010 IEEE Energy Conversion Congress and Exposition

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Elimination of magnetic saturation due to fast dynamic response in DC-DC converter

Cited by 12 publications

References 7 publications

A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

A Novel DC Bias Suppression Strategy for Single-Phase Full-Bridge DC-DC Arc Welding Converter

Magnetic flux density bias analysis and suppression strategy for voltage‐fed single‐stage full‐bridge converter

Implementation of digitally controlled phase shift full bridge converter for server power supply

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