Control circuit of coupled inductor interleaved four-switch buck-boost bidirectional converter

A bidirectional converter, coupled inductance technology, applied in the direction of regulating electrical variables, control/regulating systems, high-efficiency power electronic conversion, etc. Control methods and other issues to achieve the effect of reducing hardware costs, easy programming, and reducing switching losses

Pending Publication Date: 2022-05-06
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the existence of coupled inductors will make the inductor current no longer change linearly within a switching cycle, and the existing control strategy will no longer be applicable. At this stage, there is a lack of soft switching control for the four-switch buck-boost bidirectional converter with coupled inductors interleaved in parallel. method

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  • Control circuit of coupled inductor interleaved four-switch buck-boost bidirectional converter
  • Control circuit of coupled inductor interleaved four-switch buck-boost bidirectional converter
  • Control circuit of coupled inductor interleaved four-switch buck-boost bidirectional converter

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] The control circuit of the coupled inductor interleaved parallel four-switch buck-boost bidirectional converter involved in the present invention, such as Figure 5 shown. The coupled inductor interleaved parallel four-switch buck-boost bidirectional converter includes a DC power supply 1 , a bus capacitor 2 , a coupled inductor interleaved parallel four-switch buck-boost bidirectional converter 3 , a filter capacitor 4 and a battery 5 . The control circuit is a soft switch control circuit 6 . The soft switch control circuit includes two voltage sensors, a current sensor, two subtractors, two data buses, four arithmetic units, a voltage regulator, a current regulator, a multiplier, two comparators, two Strobe, a scaler, and a PWM signal generator and phase shifter; as follows:

[0037] The first voltage sensor samples the voltage ...

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Abstract

The invention discloses a soft switching control circuit of a coupled inductor interleaved four-switch buck-boost bidirectional converter, belongs to the technical field of control of power electronic converters, and can enable the converter to work in a critical state under the condition of considering nonlinearity of coupled inductors. Zero-voltage conduction of the switch tube can be realized under the conditions of different loads and input and output voltages; according to the invention, a method for calculating the turn-off time and the dead time by considering the influence of the coupling inductance is provided, so that zero-voltage conduction of all switching tubes is realized; by adopting the interleaving parallel structure, the inductive current flowing through each switching tube can be effectively reduced, the on-state loss is reduced, the control is simple and easy to realize, the high power density of the converter is facilitated, and the interleaving parallel structure has a wide application prospect in the field of low-voltage large-current lithium battery charging and discharging.

Description

technical field [0001] The invention belongs to the technical field of power electronics. Background technique [0002] The four-switch buck-boost (FSBB) converter is widely used in energy storage systems, photovoltaic optimizers and other fields due to its advantages of wide voltage range and high efficiency. Its topology is as follows: figure 1 shown. When the inductor current is in continuous conduction mode (CCM), there is a large switching loss on the switch tube, which will seriously affect the power conversion efficiency of the converter when the switching frequency is increased. When the converter inductor current is in the critical conduction mode (CRM), the resonance between the power inductor and the junction capacitance of the switch tube can be used to realize the zero voltage turn-on (ZVS) or valley voltage turn-on (VS) of the switch tube during the dead time. , significantly reducing switching losses. Based on this idea, the literature "Z.Liu, B.Li, F.C.Lee...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M1/088H02M1/38
CPCH02M3/1582H02M1/088H02M1/38Y02B70/10
Inventor 雷峥子黄陈楠刘远致诸葛慧子郑仲舒张犁
Owner HOHAI UNIV
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