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Equivalent capacitance voltage division auxiliary commutation Boost converter

An equivalent capacitor and converter technology, applied in the field of boost converters, can solve the problems of complex detection and delay control circuits, unbalanced charge at the voltage dividing point of capacitors, and unstable voltage.

Active Publication Date: 2022-01-28
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the technical bottleneck always lies in the unbalanced charge at the voltage dividing point of the DC link capacitor and the unstable voltage, especially in low output frequency applications.
Complex detection and delay control circuits are required to control the energy storage of the commutation inductor before commutation according to the voltage of the voltage dividing point and the load current

Method used

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  • Equivalent capacitance voltage division auxiliary commutation Boost converter
  • Equivalent capacitance voltage division auxiliary commutation Boost converter
  • Equivalent capacitance voltage division auxiliary commutation Boost converter

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Embodiment Construction

[0092] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative efforts shall fall within the protection scope of the present invention.

[0093] Such as figure 1 As shown, the present invention provides a Boost converter with equivalent capacitor voltage division auxiliary commutation, including: main diode D 1 , main switching tube S 2 , filter inductance L Tf , DC bus capacitor C B , input power V Tf , Auxiliary capacitor C a1 , the first auxiliary diode D a1 , the second auxiliary diode D a2 , the third auxiliary switch t...

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Abstract

The invention discloses an equivalent capacitance voltage division auxiliary commutation Boost converter which comprises a main diode D1, a main switch tube S2, a filter inductor LTf, a direct current bus capacitor CB, an input power supply VTf, an auxiliary capacitor Ca1, a first auxiliary diode Da1, a second auxiliary diode Da2, a third auxiliary switch tube Sa3, a fourth auxiliary switch tube Sa4 and an auxiliary commutation inductor Lr. According to the invention, ZVS conducting of the main loop switch and ZCS conducting of the auxiliary loop switch can be realized. An auxiliary commutation capacitor alternately charges and discharges, and the charge balance enables the capacitance voltage division point to maintain a constant voltage state. The efficiency and the power density are effectively improved, and the cost and the EMI are reduced.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a Boost converter with equivalent capacitance voltage division auxiliary commutation. Background technique [0002] Power factor correction PFC is usually used to improve power factor PF and reduce total harmonic distortion. Among many PFC circuits, Boost converters are widely used because of their simple structure, continuous input current and strong uniformity of characteristics. Among them, the bridgeless Boost PFC reduces the conduction loss by reducing the number of semiconductor devices on the working circuit, so as to improve the efficiency. However, the problem of switching loss in bridgeless PFC is prominent. When the switching frequency is increased, the switching loss in the circuit will increase accordingly, especially when the circuit works in CCM, the reverse recovery current of the freewheeling diode will increase the switching Turn-on loss of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/04H02M3/07H02M3/156H02M3/158H02M1/44
CPCH02M3/04H02M3/07H02M3/156H02M3/158H02M1/44Y02B70/10
Inventor 禹健刘鑫
Owner SHANXI UNIV
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