A high voltage input step-down conversion circuit

A conversion circuit and high-voltage input technology, which is applied in the field of high-voltage input step-down conversion circuits, can solve the problems of large turn-off loss of synchronous rectifiers, poor reverse recovery performance of MOSFET body diodes, unfavorable circuit stability control and EMI processing.

CN109756117BActive Publication Date: 2020-07-07NO 24 RES INST OF CETC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-07-07

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Abstract

The invention provides a high-voltage input buck conversion circuit, comprising a switch module, a reverse flow module, an energy storage module, a voltage cut-off and freewheeling module, a voltage stabilizing and filtering module and an energy release module, wherein the switch module is used for controlling on and off of an input voltage; the reverse flow module is used for providing a reverseflow channel after the switch module is turned off; the energy storage module is used for storing and transferring energy of a load; the voltage cut-off and freewheeling module is used for cutting offoutput of the switch module and providing a freewheeling channel for the energy storage module; the voltage stabilizing and filtering module is used for performing voltage stabilizing and filtering on an output voltage; and the energy release module is used for providing an energy release channel for the reverse flow module. The high-voltage input buck conversion circuit provided by the inventioncan effectively avoid the oscillation problem of the conversion circuit, improve reliability of the circuit and avoid influence of a load on a duty ratio of an input switch, so that stability of thecircuit is improved.
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Description

technical field

[0001] The invention relates to the field of power electronics, in particular to a high-voltage input step-down conversion circuit. Background technique

[0002] With the rapid development of electronic and electrical systems in the direction of miniaturization and light weight, in order to reduce the size and weight of power supply cables, high-voltage power supply solutions are more and more widely used. The power supply voltage of the airborne equipment is as high as 270V, while the operating voltage of the load equipment is usually within 28V. At this time, it is necessary to efficiently and reliably convert the high voltage input into a lower intermediate bus voltage or low voltage output, while satisfying stability control and EMI performance.

[0003] The existing step-down conversion circuit adopts diode freewheeling, but when the load is light or no-load, the inductor current will enter the discontinuous mode. Due to the resonance of the filter induc...

Examples

Embodiment Construction

[0030] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...