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DC magnetic biasing 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 the excitation inductance, increasing the cost and loss, and damaging the power of the full-bridge circuit Switch tube and other problems to achieve the effect of eliminating DC bias and suppressing bias magnetism

Active Publication Date: 2019-02-26
STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO +3
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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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  • DC magnetic biasing suppression method for bidirectional full-bridge DC/DC converter
  • DC magnetic biasing suppression method for bidirectional full-bridge DC/DC converter
  • DC magnetic biasing suppression method for bidirectional full-bridge DC/DC converter

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Embodiment Construction

[0018] Such as figure 1 As shown, a bidirectional full-bridge DC / DC converter circuit, its circuit structure is: the primary side of the high-frequency transformer T1 and the inductor L s The bridge structure switch tubes Sa1 to Sa4 are connected in series, and the bridge structure switch tubes Sb1 to Sb4 are connected in the secondary side; the DC terminal V1 is between the upper and lower bridge arms of the primary side, and the DC terminal V2 is between the upper and lower bridge arms of the secondary side ; The transformation ratio of the above-mentioned high-frequency transformer is n; the above-mentioned switching tubes are all anti-parallel diodes.

[0019] Such as figure 2 Shown, the schematic diagram of the control method of the present invention. In one cycle, Sa1 and Sa4 are turned on at the same time in the first half cycle, and Sa2 and Sa3 are kept off; in the second half cycle, Sa2 and Sa3 are turned on at the same time, and Sa1 and Sa4 are kept off, so that t...

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Abstract

The invention discloses a DC magnetic biasing suppression method for a bidirectional full-bridge DC / DC converter, and belongs to the field of bidirectional full-bridge DC / DC converter circuit control.The suppression method comprises: calculating a required phase shift angle after power change, in a first cycle after the required power change, quantitatively changing the phase shift angle and dutycycle of a secondary side, and working at a steady phase shift angle in a second cycle after the required power change. The suppression method of the invention can quickly restore the current flowingthrough a transformer to the steady current after the power change by controlling the voltage at a secondary side AC side in one cycle, to eliminate the DC bias of the restoring process, thereby suppressing the magnetic biasing, and is of great significance for the bidirectional full-bridge DC / DC converter circuit in applications where power is changed.

Description

technical field [0001] The invention relates to the field of bidirectional full-bridge DC / DC converter circuit control, and specifically relates to a method for suppressing direct current bias magnetic field used in a bidirectional full-bridge DC / DC converter. Background technique [0002] As one of the most commonly used topologies at home and abroad, the bidirectional full-bridge DC / DC circuit has been widely used due to its high power density, small volume and weight, and high power transmission efficiency, especially in medium and large power applications. common. [0003] The bidirectional full-bridge DC / DC circuit contains a high-frequency transformer. The high-frequency transformer is a power transformer with a working frequency exceeding 10kHz. It is mainly used as a high-frequency switching power supply transformer in a high-frequency switching power supply. High-frequency transformers can efficiently realize the functions of power transmission, step-up and step-do...

Claims

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Application Information

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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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