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High-frequency auxiliary power supply based on multi-Buck circuit

A high-frequency assisted and multiplexed technology, applied in the direction of high-efficiency power electronic conversion, electrical components, adjusting electrical variables, etc., can solve the problems of low power density and large volume, and achieve the effect of ensuring versatility and high power density characteristics

Active Publication Date: 2021-09-24
中科华士电气科技南京有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

However, the traditional industrial frequency auxiliary power supply has the problems of large volume and low power density

Method used

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  • High-frequency auxiliary power supply based on multi-Buck circuit

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Embodiment approach

[0024] As a specific implementation, when the load changes dynamically, the method adjusts the capacitor voltage at the output terminal C3 of the multiple Buck cascade circuit at the front end in real time to ensure the stable output of the DC bus voltage at both ends of the diode uncontrolled rectifier circuit C4 at the back. For example, when the DC bus voltage at both ends of the diode uncontrolled rectification circuit C4 decreases with the increase of the load capacity, the output voltage is stabilized by increasing the voltage of the front-end capacitor C3.

[0025] In summary, the present invention can realize the stable adjustment of the output voltage by controlling the duty ratio of the conduction period of each phase bridge arm device, and can realize the current balance of each bridge arm through the filter inductor Lij, thereby ensuring the multiple Buck circuit output The stable output of the capacitor voltage at terminal C3 provides a constant DC power supply for...

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Abstract

The invention provides a high-frequency auxiliary power supply based on multiple-Buck circuit, which comprises a front-end multi-Buck cascade circuit and a rear-end high-frequency DC / DC circuit. The front-end multi-Buck cascade circuit is composed of a plurality of Buck circuit sub-modules connected in series, and each Buck circuit sub-module comprises a plurality of half-bridge arms connected in parallel; the front-end multi-Buck cascade circuit realizes voltage division through series connection of Buck circuit sub-modules, shunting through parallel connection of half-bridge arms is achieved, and a constant direct-current power supply is provided for the rear-end high-frequency DC / DC circuit; and the rear-end high-frequency DC / DC circuit realizes transmission and isolation of circuit energy through a high-frequency transformer. High voltage division is realized through a series structure, current parallel shunting is realized through a parallel structure, wide-range operation conditions of input DC voltage and current can be realized, and universality and high power density characteristics of the auxiliary unit are ensured.

Description

technical field [0001] The invention relates to high-frequency auxiliary power supply technology, in particular to a high-frequency auxiliary power supply based on multiple Buck circuits. Background technique [0002] In the application of power electronics technology and various power supply systems, switching power supply technology is at the core. For large-scale electrolytic plating power supplies, the traditional circuit is very large and heavy. If the Gordon switching power supply technology is used, its volume and weight will be greatly reduced, and it can greatly improve power utilization efficiency, save materials, and reduce costs. In electric vehicles and frequency conversion drives, switching power supply technology is even more inseparable. Through switching power supply, the frequency of power consumption can be changed, so as to achieve near-ideal load matching and drive control. High-frequency switching power supply technology is the core technology of vario...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M3/335
CPCH02M3/1584H02M3/33584Y02B70/10
Inventor 陈爱林葛琼璇
Owner 中科华士电气科技南京有限公司
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