Control circuit of interleaved parallel bidirectional Buck-Boost converter

A control circuit and converter technology, applied in the field of converters, can solve the problem of high hardware cost and achieve the effect of reducing output current ripple

Inactive Publication Date: 2021-06-18
江苏新仁源电力科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] When the existing interleaved parallel bidirectional Buck-Boost converter is working, controlling the critical continuity of the inductor current can reduce the switching loss of the switching devi

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  • Control circuit of interleaved parallel bidirectional Buck-Boost converter

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[0018] Next, the technical solutions in the embodiments of the present invention will be apparent from the embodiment of the present invention, and it is clearly described, and it is understood that the described embodiments are merely embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, there are all other embodiments obtained without making creative labor without making creative labor premises.

[0019] Such as figure 1 A control circuit of a staggered parallel bidirectional Buck-Boost converter, interleave-in-line two-way Buck-Boost converter can be used to connect high voltage DC bus and low voltage cells, respectively, respectively, respectively, the voltage terminal voltage is U H , Low voltage end voltage is U L Further, the other S1 to S4 is four power switches, L1, L2 are power inductance, C1, C2, respectively, filter capacitance, including first selector, second collector, third selector, fourth choice Conne...

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Abstract

The invention discloses a control circuit of an interleaved parallel bidirectional Buck-Boost converter and belongs to the field of converters. The converter can work in a charging state or a discharging state according to actual needs, a voltage outer loop and a current inner loop generate regulating variables, and the output of the current inner loop is multiplied by a preset period T to obtain the conduction time of a switching device; according to a volt second balance theorem, required turn-off time can be calculated, so that the inductive current can be controlled to be in a critical conduction mode. According to the control circuit of the interleaved parallel bidirectional Buck-Boost converter, a high-precision high-frequency current sampling circuit and a zero-cross detection circuit can be avoided, the inductive current can be controlled to be in a critical continuous state just by sampling voltage signals and low-frequency current signals. The method has the advantage of low cost.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to an interleaved parallel bidirectional Buck-Boost converter control circuit. Background technique [0002] When the existing interleaved parallel bidirectional Buck-Boost converter is working, controlling the critical continuity of the inductor current can reduce the switching loss of the switching device and improve the efficiency of the converter, but the traditional solution requires a high-precision high-frequency current sampling circuit and a zero-crossing detection circuit. , the hardware cost is higher. Contents of the invention [0003] The purpose of the present invention is to provide a control circuit of interleaved parallel bi-directional Buck-Boost converters to reduce costs. [0004] The object of the present invention is achieved like this: a kind of control circuit of interleaved parallel bidirectional Buck-Boost converter, comprises the first gating device,...

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Application Information

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IPC IPC(8): H02M3/158H02M1/08H02M1/088
CPCH02M1/08H02M1/088H02M3/1584
Inventor 张犁张涛
Owner 江苏新仁源电力科技有限公司
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