Absorption circuit for absorbing spike voltage of two-transistor forward converter

A forward converter and absorption circuit technology, applied in the field of absorption circuits, can solve the problems of large energy loss, low energy efficiency, and large heat generation, and achieve the effects of suppressing voltage spikes, low heat generation, and avoiding large losses

Inactive Publication Date: 2015-04-15
武汉瑞莱富科技有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a snubber circuit for absorbing the peak voltage of the dual-transistor forward converter, which solves the problem of large heat generation and large energy loss when the prior art adopts the resistance-capacitance method to absorb the peak voltage. and low energy efficiency technical problems

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  • Absorption circuit for absorbing spike voltage of two-transistor forward converter
  • Absorption circuit for absorbing spike voltage of two-transistor forward converter
  • Absorption circuit for absorbing spike voltage of two-transistor forward converter

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Embodiment Construction

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0019] This embodiment is a snubber circuit for absorbing the peak voltage of a dual-transistor forward converter. This snubber circuit is a passive and lossless circuit, including two switch tubes Q8 and Q7. In other embodiments, Q8 may also be included. , Q7, Q13, Q12 four switch tubes, such as figure 1 shown. In the figure, C59 and C56 are the snubber capacitors of Q8 and Q13, Q7 and Q12 respectively, D16 and D22 are respectively unidirectional conductive snubber diodes, which provide a unidirectional conductive circuit during the action of the snubber circuit when the switching tube is disconnected; L3 uses The sendust magnetic ring provides a reset circuit for the absorption circuit; D18 and D23 are the clampi...

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Abstract

The invention relates to the field of switching power supplies, in particular to an absorption circuit for absorbing spike voltage of a two-transistor forward converter. A resistor is replaced by an iron-silicon-aluminum magnet ring to serve as an absorption loop in a switching power supply, the technical problems that during absorption of the spike voltage by means of resistance-capacitance in the prior art, heat generation is high, energy loss is high and energy efficiency is low are solved, voltage spikes generated by reverse restoration of diodes can be effectively suppressed, reliable running of the circuit is guaranteed, the defect that the conventional RCD buffering absorption network is high in loss is avoided, RC absorption is fully replaced, heat generation is low, safety is higher, energy efficiency is high, and the absorption circuit is widely applicable to power supply products.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to an absorbing circuit for absorbing the peak voltage of a double-transistor forward converter. Background technique [0002] With the global emphasis on energy issues, the energy consumption of electronic products will become more and more prominent. How to reduce their standby power consumption and improve power supply efficiency has become an urgent problem to be solved. Although the traditional linear power supply has a simple circuit structure and reliable operation, it has disadvantages such as low efficiency (only 40%-50%), large volume, large consumption of copper and iron, high operating temperature and small adjustment range. In order to improve efficiency, people have developed a switching power supply, which has an efficiency of more than 85% and a wide range of voltage regulation. In addition, it also has the characteristics of high voltage regulation accuracy a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/34
CPCH02M1/34H02M1/346Y02B70/10
Inventor 范保中魏建设张峰伟
Owner 武汉瑞莱富科技有限公司
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