Hybrid series-parallel full-bridge circuit applicable to high-voltage or high-current output and control method for hybrid series-parallel full-bridge circuit

A full-bridge circuit and high-current technology, applied in high-efficiency power electronic conversion, output power conversion device, DC power input conversion to DC power output, etc., can solve the problem of complex control circuit of the converter, overheating of the converter, and reduced reliability and other issues, to achieve the effect of facilitating heat transfer and flat design, dispersing power consumption, and reducing line voltage drop

Inactive Publication Date: 2016-11-30
连云港杰瑞电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid overheating or even damage to a single converter caused by uneven current flow between converters during operation, and to ensure that the output currents of the converters are approximately equal and the power is evenly distributed, it is necessary to add a current sharing circuit inside the converter, so that the converter The control circuit is more complex and the reliability is reduced

Method used

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  • Hybrid series-parallel full-bridge circuit applicable to high-voltage or high-current output and control method for hybrid series-parallel full-bridge circuit
  • Hybrid series-parallel full-bridge circuit applicable to high-voltage or high-current output and control method for hybrid series-parallel full-bridge circuit
  • Hybrid series-parallel full-bridge circuit applicable to high-voltage or high-current output and control method for hybrid series-parallel full-bridge circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, with reference to figure 1 and figure 2 , a hybrid series-parallel full-bridge circuit suitable for high-voltage or high-current output: the hybrid series-parallel full-bridge circuit is composed of m full-bridge conversion units connected in parallel on the input side and connected in series / parallel on the output side; m is a positive integer And m≥2; when the output side is connected in series, it is suitable for high-voltage output occasions, and when the output sides are connected in parallel, it is suitable for high-current output occasions.

[0034]Each full-bridge conversion unit includes:

[0035] Four MOS transistors, a series DC blocking capacitor, a series resonant inductor, n isolation transformers, 2n rectifier diodes, n filter inductors and filter capacitors, n is a positive integer and n≥1;

[0036] Among them, four MOS tubes constitute the primary side bridge arm 1 of the full-bridge converter, and the primary side windings of n transfo...

Embodiment 2

[0037] Embodiment 2, the control method utilizing the hybrid series-parallel full-bridge circuit described in Embodiment 1 is:

[0038] (1) The full-bridge conversion unit adopts the phase-shift control ZVS PWM or down-tube modulation ZVS PWM full-bridge soft switching control method, and realizes the soft switching of the lagging MOS tube through the series resonant inductor on the primary side;

[0039] (2) The full-bridge conversion unit with m=1 is the main control unit, and its control input signal is the output voltage feedback signal and the current isolation sampling signal of the transformer primary side, and its control output signal is the drive signal of four MOS tubes; m≥2 The full-bridge conversion unit is an uncontrolled unit, and the driving signals of its four MOS transistors are given by the main control unit with m=1, the phases are the same, and the phase shift angles or duty cycles are equal.

Embodiment 3

[0040] Embodiment 3, an application example of a hybrid series-parallel full-bridge circuit suitable for high-voltage or high-current output:

[0041] refer to image 3 , the input of the example is three-phase 380V AC, the output is 50V / 200A, the three-phase 380V AC is boosted by the three-phase PFC circuit and the value is 630V DC as the input of the subsequent hybrid series-parallel full-bridge circuit; the latter-stage hybrid series-parallel full-bridge circuit Contains two full-bridge conversion units, m=1 full-bridge conversion unit is the main control unit, the main control board in the main control unit collects the output voltage signal, and at the same time collects the primary current signal through the current transformer Ts, and the collected voltage And the current signal is used as the feedback input signal to control the stability of the output voltage. The control chip in the main control board chooses the ISL6754 of Intersil Company, and adopts the down-tube ...

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Abstract

The invention discloses a hybrid series-parallel full-bridge circuit applicable to high-voltage or high-current output, and belongs to the field of power electronics conversion. The hybrid series-parallel full-bridge circuit consists of m full-bridge conversion units, the input sides of which are connected in parallel and the output sides of which are connected in series/in parallel; m is greater than or equal to 2; when the output sides are connected in series, the hybrid series-parallel full-bridge circuit is applicable to a high-voltage output occasion; and when the output sides are connected in parallel, the hybrid series-parallel full-bridge circuit is applicable to a high-current output occasion. The invention further discloses a control method for the hybrid series-parallel full-bridge circuit applicable to high-voltage or high-current output. All the full-bridge conversion units of the hybrid series-parallel full-bridge circuit have self voltage/current sharing capacity, so that all transformers and output rectification and filtration parts in the full-bridge conversion units are forced to share voltage/current; the circuit structure is high in expansion capacity; the hybrid series-parallel full-bridge circuit is applicable to an application occasion with high-voltage or high-current output, and is high in engineering application value.

Description

technical field [0001] The invention relates to a high-power DC / DC power supply, in particular to a hybrid series-parallel full-bridge circuit suitable for high-voltage or high-current output, which belongs to the field of power electronic conversion. Background technique [0002] The power supply system of various equipment in ships and radar systems is mostly distributed power supply: the input three-phase 380VAC alternating current is rectified, filtered and power factor corrected to generate high-voltage direct current, and then the high-voltage direct current is converted by a high-power DC / DC converter The bus voltage is used to supply power to the downstream distributed electrical equipment. In the case of long transmission lines, high-voltage DC power supply is often used to reduce the transmission current and transmission impedance. At this time, the bus voltage is usually set to 300VDC~450VDC. The high output voltage makes it difficult to select the type of diode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569Y02B70/10
Inventor 刘传亮孙涛高玺肖化阳良春张敏杨涛马柏平杨静马德宝
Owner 连云港杰瑞电子有限公司
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