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A DC Bias Suppression Method for Bidirectional Full Bridge DC/DC Converter

A DC bias suppression and converter technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve the problem of reducing excitation inductance, increasing cost and loss, and limiting high-frequency isolation full bridge circuit performance and other issues, to achieve the effect of eliminating DC bias and suppressing bias magnetism

Active Publication Date: 2021-05-04
STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO +3
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when the power of the circuit changes, the current flowing through the transformer will generate a DC bias, which will cause the high-frequency transformer to appear saturated and biased. If the saturation bias is severe, the exciting inductance will decrease rapidly, and the single-phase magnetizing current will decrease rapidly. increase, thereby damaging the power switch tube of the full-bridge circuit, which has also become the main problem that limits the performance of the high-frequency isolated full-bridge circuit
[0004] At present, the bias suppression caused by the increase of the load is mainly realized by connecting the resistance and the inductor in series on the AC side. Make the current slowly return to normal state, but the limitation of this method is that it increases the cost and loss

Method used

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  • A DC Bias Suppression Method for Bidirectional Full Bridge DC/DC Converter
  • A DC Bias Suppression Method for Bidirectional Full Bridge DC/DC Converter
  • A DC Bias Suppression Method for Bidirectional Full Bridge DC/DC Converter

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Embodiment Construction

[0018]Such asfigure 1 As shown, a two-way full bridge DC / DC converter circuit, its circuit structure: the primary side and inductance L of the high frequency transformer T1sThe series connection is connected to the bridge structure switch tube Sa1 to SA4, the sub-side connection is connected to the bridge structure switch tube SB1 to SB4; the upper lower bridge arm is DC terminal V1, and the lower bridge arm is DC terminal V2 The high frequency transformer ratio is n; the above-mentioned switch tube is opposite the diode.

[0019]Such asfigure 2 As shown, the method of controlling the method of the present invention. In one cycle, the first half cycle SA1 and SA4 are simultaneously turned on, SA2 and SA3 remain turned off; the second half cycle SA2 and SA3 are turned on simultaneously, SA1 and SA4 remain turned off, so that the high-frequency transformer is active VAB Obtainfigure 2 (a) voltage. During the same cycle, the four switch tubes in the secondary side of the transformer wer...

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Abstract

The invention discloses a DC bias suppression method for a bidirectional full-bridge DC / DC converter, which belongs to the field of circuit control of a bidirectional full-bridge DC / DC converter. The suppression method includes: calculating the required phase shift angle after power change , in the first cycle after the required power change, quantitatively change the phase shift angle and duty cycle of the secondary side, and start to work with a steady-state phase shift angle in the second cycle after the required power change . The invention controls the voltage of the AC side of the secondary side in one cycle so that the current flowing through the transformer can quickly recover to the steady current after the power change, and eliminates the DC bias in the recovery process, thereby suppressing the bias magnetism. The application of bridge DC / DC converter circuit in the occasion of power change is of great significance.

Description

Technical field[0001]In the field of bidirectional full bridge DC / DC converter circuit control of the present invention, therefore, there is a specific to a DC bias suppression method for bidirectional full bridge DC / DC converters.Background technique[0002]The two-way full bridge DC / DC circuit is one of the most commonly used topologies at home and abroad. Due to the high power density, the volume is small, the energy transmission efficiency is high, and the wide application of everyone is more widely used, which is more in the middle and large power applications. common.[0003]The two-way full bridge DC / DC circuit contains a high frequency transformer, and the high-frequency transformer is a power transformer having a operating frequency of more than 10 kHz, mainly used in high-frequency switching power supply transformers. The high-frequency transformer can efficiently realize the function of electrical energy transmission, boosting and electrical isolation, and is an impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0038
Inventor 郁正纲程亮蔺华孙海霞伏祥运岳付昌朱立位李红杜云虎王琛封波季振东王建华吴小丹魏星胡泽伟
Owner STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO
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