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Wide-voltage isolation type DC-DC converter with automatic current limiting function

A DC-DC and automatic current-limiting technology, applied in the field of converters, can solve problems such as large variation range and difficult design of isolated DC-DC converters, and achieve simple voltage regulation control, simplified circuit layout design, switching The effect of low loss

Active Publication Date: 2020-04-17
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large variation range of the two levels of voltage, it is difficult to design especially for isolated DC-DC converters

Method used

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  • Wide-voltage isolation type DC-DC converter with automatic current limiting function
  • Wide-voltage isolation type DC-DC converter with automatic current limiting function
  • Wide-voltage isolation type DC-DC converter with automatic current limiting function

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Embodiment Construction

[0043] The present invention is further described below. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0044] see figure 1 , the present invention provides a wide-voltage isolated DC-DC converter with automatic current limiting function, comprising two half-bridge circuits, two sets of LLC resonant cavities with split resonant capacitors, two sets of voltage clamping diode pairs, two an isolating transformer and a three-phase bridge circuit with the same transformation ratio;

[0045] The structure is as follows:

[0046] The two half-bridge circuits are respectively connected to the power supplies of their respective input terminals; the first half-bridge circuit includes two MOSFET tubes SA1-SA2; the second half-bridge circuit includes two MOSFET tubes SB1-SB2.

[0047]The first LLC resonant cavity circuit includes the resonant i...

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Abstract

The invention discloses a wide-voltage isolation type DC-DC converter with an automatic current limiting function. The wide-voltage isolation type DC-DC converter comprises two half-bridge circuits, two groups of LLC resonant cavities, two groups of voltage clamping diode pairs, two isolation transformers with the same transformation ratio and a three-phase bridge circuit, wherein the two half-bridge circuits are respectively connected with respective input end power supplies, a primary side of each of the isolation transformers is respectively connected with one end of a corresponding LLC resonant cavity resonant inductor and a neutral point of a half-bridge circuit, another end of the resonant inductor is connected with center points of two split resonant capacitors, and voltage clampingdiodes are connected with the split resonant capacitors in parallel; secondary sides of the isolation transformers are connected in series in a reversed polarity manner, and three nodes of a transformer set are respectively connected to neutral points of the three-phase bridge circuit after series connection; the advantages of LLC frequency conversion voltage regulation are utilized, series connection and parallel connection rapid switching is achieved in combination with PWM pulse 180-degree phase shift, the rapid adjustment of rated voltage and double rated voltage output is achieved, and the advantages of being small in switching loss, high in efficiency and simple in structure are achieved.

Description

technical field [0001] The invention relates to a wide-voltage isolated DC-DC converter with automatic current limiting function, belonging to the technical field of converters. Background technique [0002] The DC system is a very important part of the substation. Its main task is to provide power for relay protection devices, circuit breaker operations, and various signal circuits. The normal operation of the DC system is related to the correct operation of the relay protection and circuit breaker, which will affect the safe operation of the substation and even the entire power grid. At present, the voltage levels commonly used in substations are 110V and 220V. However, due to the large variation range of the two levels of voltage, it is difficult to design especially for isolated DC-DC converters. Therefore, starting from the actual universal requirements of substations, developing converters that meet the needs of DC busbars in substations with different specifications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/32
CPCH02M1/32H02M3/33507H02M3/33569H02M1/0058Y02B70/10
Inventor 李珅倪喜军王书征
Owner NANJING INST OF TECH
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