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A dual-loop control circuit and method for a bidirectional DC converter

A bidirectional DC conversion and double-loop control technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the problems of poor output stability and low control accuracy, and achieve good stability and output accuracy High, guaranteed rapid effect

Active Publication Date: 2021-03-23
山东艾诺仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the control methods and devices of bidirectional DC converters mostly use single-loop control, which has low control accuracy, poor output stability, and manual operation is required to switch the source-load mode.

Method used

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  • A dual-loop control circuit and method for a bidirectional DC converter
  • A dual-loop control circuit and method for a bidirectional DC converter
  • A dual-loop control circuit and method for a bidirectional DC converter

Examples

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Embodiment 1

[0027] This embodiment discloses a double-loop control circuit for a bidirectional DC converter, such as image 3As shown, the bidirectional DC converter includes bus capacitor C3, switch tubes T1, T2, output inductor L, output capacitor C4 and load resistor R8. One side of the bidirectional DC converter is Udc, and the other side is Uo, and Uo is the output terminal. One end of capacitor C3 is connected to Udc+, the other end is connected to Udc-, the bases of switch tubes T1 and T2 are respectively connected to drive signals PWM-1 and PWM-2, the collector of switch T1 is connected to Udc+, and its emitter is connected to the collector of switch tube T2 Connected together, the emitter of the switching tube T2 is connected to Udc- and Uo- respectively, the connection point between the emitter of the switching tube T1 and the collector of the switching tube T2 is connected to Uo+ through the output inductance L, and the output capacitor C4 is connected to Uo+ and Uo-, the load ...

Embodiment 2

[0047] The present invention also discloses a double-loop control method for a bidirectional DC converter, the control method is based on the control circuit described in Embodiment 1, and includes the following steps:

[0048] S01), switch between the source mode and the load mode by applying the voltage applied to the output terminal Uo of the bidirectional DC converter. When the external voltage applied to the output terminal Uo is higher than the output voltage of the converter, the bidirectional DC converter operates on load mode, when the external voltage applied to the output terminal Uo is lower than the output voltage of the converter, the converter operates in the source mode; S02), through the change of the relationship between the given signal and the sampling signal to achieve forward constant voltage and forward constant current , reverse constant voltage, reverse constant current conversion.

[0049] In this embodiment, S02 is specifically:

[0050] In source m...

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Abstract

The invention discloses a double-loop control circuit and method used for a bidirectional direct current converter. The double-loop control circuit includes an outer loop circuit, an inner loop circuit, a driving waveform generating circuit, and the bidirectional direct current converter. The outer loop circuit includes a voltage outer loop controller, a forward current outer loop controller, an isolation gating circuit, a negative taking circuit and a reverse current outer loop controller. The driving waveform generating circuit includes a comparator, a Schmitt inverter, a two-way dead-zone circuit and two amplification circuits. Through outer loop circuit and inner loop circuit control, output precision is high, stability is good, forward and backward automatic switch is performed simultaneously and manual operation intervention is not needed. By using the method, fast and highly-stable operation of the bidirectional direct current converter is completed, and four operating states ofa forward constant voltage, a forward constant current, a reverse constant voltage, and a reverse constant current are automatically and seamlessly switched.

Description

technical field [0001] The invention relates to a double-loop control circuit and method for a bidirectional DC converter, which belongs to the technical field of bidirectional DC converter control and can realize automatic forward and reverse switching of the bidirectional DC converter. Background technique [0002] A bidirectional DC converter (BDC, Bi-directional DC-DC Converter), as its name implies, is a DC converter that can realize bidirectional flow of energy. The bidirectional DC converter can operate in "source" mode and "load" mode, and the "source" and "load" modes can be interchanged, that is to say, the bidirectional flow of energy can be realized according to the needs. The "source" mode means that the bidirectional DC converter runs in the forward direction, the "load" mode means that the bidirectional DC converter runs in the reverse direction, and the source-load mode switching is the forward and reverse switching. The bidirectional DC converter has the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M3/1582
Inventor 禹金标董会娜白洪超
Owner 山东艾诺仪器有限公司