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Circuit and control method for suppressing short-circuit current impact of power electronic converter

A power electronics and short-circuit current technology, applied in electrical components, output power conversion devices, etc., can solve problems such as system closed-loop cut-off frequency limitation, system reliability threats, etc., to achieve short-circuit output function, improve reliability, and suppress current. impact effect

Active Publication Date: 2019-07-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, in practical applications, in order to ensure the stability of the converter in the full input voltage range and full load range, the improvement of the system closed-loop cut-off frequency is greatly restricted; in addition, the method of increasing the system closed-loop cut-off frequency can only To a certain extent, the impact of short-circuit current is reduced, and the reliability of the system is still facing a great threat

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  • Circuit and control method for suppressing short-circuit current impact of power electronic converter
  • Circuit and control method for suppressing short-circuit current impact of power electronic converter
  • Circuit and control method for suppressing short-circuit current impact of power electronic converter

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0042] figure 1 Shown is the circuit schematic diagram of the traditional voltage-current double-loop control power electronic converter.

[0043] The invention discloses a circuit for suppressing short-circuit current impact of a power electronic converter, including a power stage circuit and a control circuit;

[0044] The power stage circuit includes a main power switch tube, a filter inductor and a filter capacitor; wherein the main power switch tube is used to receive the input voltage V of the power stage circuit in , generate a high-frequency discrete voltage, and the filter inductor and filter capacitor are used to shape the high-frequency discrete voltage into the output voltage V of the power stage circuit O ;

[0045] The control circuit includes a voltage sampling circuit, a voltage compensation circuit, a maximum current limiting ci...

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Abstract

The invention discloses a circuit capable of inhibiting short-circuit current shock of a power electronic converter, and a control method of the circuit. An output voltage feedforward control mode is adopted, output voltage of a power-stage circuit serves as a feedfoward signal, the feedfoward signal plus a current error signal jointly serve as a modulating signal after a proportional link, and the modulating signal and triangular carrier wave are intersected to acquire a PWM signal to drive a main power switch tube. During normal work, the modulating signal consists of the output voltage feedforward signal and the current error signal and the output voltage feedforward signal is the main component; and during load short circuit of the converter, the output voltage is close to 0 and the modulating signal is equal to the current error signal. The fact that the current error signal basically maintains unchanged before and after load short circuit of the converter by reasonably setting the output voltage feedforward coefficient; the duty ratio of the main power switch tube at the short-circuit moment is corrected timely due to the delay influence of a bypass PI compensation network, and the current shock of the short-circuit moment is effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a circuit for suppressing short-circuit current impact of a power electronic converter and a control method thereof. Background technique [0002] The 270V aviation high-voltage DC power supply system has the advantages of safety, reliability, light weight, and energy saving. It is the development direction of the aircraft power supply system at this stage. In order to supply power to some airborne 28V electrical equipment, a high step-down ratio DC / DC converter is required. In order to improve the power supply reliability of the aviation electrical system, the relevant standards require that the DC converter has an overload capacity of 2 times the rated load current and a short-circuit capacity of 3 times the rated load current for 5 seconds. [0003] The power electronic converter based on voltage-current double-loop control has the advantages of fast dynamic respons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 任永宏张方华谢敏刘硕孟无忌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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