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Control circuit of two-way DC/DC (Direct Current/Direct Current) power converter and control method of control circuit

A technology of power converter and control circuit, which is applied in the direction of DC power input conversion to DC power output, output power conversion device, control/regulation system, etc., and can solve the problems of poor dynamic performance of bidirectional DC/DC power converters, etc.

Pending Publication Date: 2017-08-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of poor dynamic performance of bidirectional DC / DC power converters in the prior art, a bidirectional DC / DC power converter control circuit and its control method

Method used

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  • Control circuit of two-way DC/DC (Direct Current/Direct Current) power converter and control method of control circuit
  • Control circuit of two-way DC/DC (Direct Current/Direct Current) power converter and control method of control circuit
  • Control circuit of two-way DC/DC (Direct Current/Direct Current) power converter and control method of control circuit

Examples

Experimental program
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Embodiment 1

[0118] A bidirectional DC / DC power converter control circuit of this embodiment, such as figure 1 and image 3 , including voltage division detection circuit 5, A / D conversion circuit 7 and digital controller 8, also includes drive circuit 9 and voltage follower 6, bidirectional DC / DC power converter, voltage division detection circuit 5 is connected in parallel in bidirectional DC / DC The two ends of the input / output capacitor of the power converter, the voltage division detection circuit 5, the voltage follower 6, the A / D conversion circuit 7, the digital controller 8, the drive circuit 9 and the switching tube power of the bidirectional DC / DC power converter The gates of the switch tubes of circuit 3 are connected in series in sequence.

[0119] Such as figure 1 As shown, the output terminal of the voltage division detection circuit 5 is connected to the input terminal of the voltage follower 6, the output terminal of the voltage follower 6 is connected to the input termin...

Embodiment 2

[0125] A bidirectional DC / DC power converter control circuit of this embodiment, such as figure 1 , on the basis of the technical solution of embodiment 1, the described bidirectional DC / DC power converter is a non-isolated bidirectional DC / DC power converter (generally speaking, the switching tube of the non-isolated bidirectional DC / DC power converter The power circuit 3 includes two switch tubes), including an energy storage unit 1 connected in parallel, a low-voltage side filter and energy storage circuit 2, a switch tube power circuit 3 and a high-voltage side filter circuit 4, and the input / output capacitor It is the low-voltage side filter capacitor of the low-voltage side filter and energy storage circuit 2 or the high-voltage side filter circuit 4 .

[0126] The control method of the present invention is not applicable to the topology of the isolated bidirectional DC / DC power converter, because the working mode of the isolated bidirectional DC / DC power converter is co...

Embodiment 3

[0129] A bidirectional DC / DC power converter control circuit of this embodiment, such as figure 1 , further defined on the basis of the technical solution of embodiment 1 or 2, the described bidirectional DC / DC power converter is a bidirectional Buck-Boost converter, including the low-voltage side voltage V L , Low-voltage side filter capacitor C L , energy storage inductance L, switch tubes Q1 and Q2, freewheeling diode D1, freewheeling diode D2 and high-voltage side capacitor C, the energy storage unit 1 is the low-voltage side voltage V L , the low-voltage side filter and energy storage circuit 2 includes a low-voltage side filter capacitor C L and energy storage inductance L, the switching tube power circuit 3 includes switching tubes Q1 and Q2, freewheeling diode D1 and freewheeling diode D2, and the high-voltage side filter circuit 4 includes a high-voltage side capacitor C;

[0130] Low side voltage V L The positive and low side filter capacitor C L One end of and o...

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PUM

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Abstract

The invention discloses a control circuit of a two-way DC / DC (Direct Current / Direct Current) power converter and a control method of the control circuit, and belongs to the field of control circuits of power converters. The control circuit comprises a voltage division detection circuit, a voltage follower, an A / D (Analog to Digital) conversion circuit, a digital controller and a driving circuit. The control method takes control of voltage of a high voltage side as an example, and comprises the steps of stabilizing the voltage of the high voltage side by the digital controller in a PID (Proportion Integration Differentiation) control mode when the power converter operates in a steady state, and switching to capacitor charge balance control in a corresponding Buck or Boost mode from the PID control mode when the voltage division detection circuit detects that a fluctuation of the voltage of the high voltage side exceeds a set threshold. For the problem of poor dynamic property of the two-way DC / DC power converter in the prior art, the control circuit ensures an optimal transient state response process, has high steady state output accuracy, and is applicable to any non-isolated two-way DC / DC power converter.

Description

technical field [0001] The present invention relates to the field of control circuits of power converters, and more specifically relates to a control circuit of a bidirectional DC / DC power converter and a control method thereof. Background technique [0002] With the widespread use of renewable energy such as solar energy and wind energy, the discontinuity and randomness of renewable energy generation time are becoming more and more significant, which causes bus voltage fluctuations after they are incorporated into microgrids and affects power quality. Usually, bidirectional DC / DC power converters are used to connect DC busbars and energy storage devices such as supercapacitors to realize energy buffering and stabilize the busbar voltage. The bidirectional DC / DC power converter realizes the two-quadrant flow of energy, that is, the power can not only flow from the input end to the output end, but also from the output end to the input end, which is functionally equivalent to ...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M3/157H02J3/32
CPCH02J3/32H02M3/157H02M3/1582
Inventor 刘晓东甘洋洋刘宿城方炜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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