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Normal shock reset circuit for low voltage input

A reset circuit, low-voltage input technology, applied in output power conversion devices, DC power input into DC power output, electrical components and other directions, can solve the problems of low reset parameter feedback efficiency, complex structure, etc., to avoid energy consumption, Simple engineering implementation and the effect of avoiding loss

Active Publication Date: 2013-04-10
SHENZHEN AEROSPACE NEW POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to construct a forward reset circuit for low-voltage input, and overcome the technical problems of low-efficiency reset parameter feedback and complex structure of the prior art forward reset circuit for low-voltage input

Method used

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  • Normal shock reset circuit for low voltage input
  • Normal shock reset circuit for low voltage input

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0023] Such as figure 1 As shown, the specific embodiment of the present invention is: to construct a forward reset circuit for low-voltage input, including the main switch tube Q1, parasitic capacitance Coss, forward transformer TX, output rectifier circuit, output filter circuit, magnetic reset circuit ;

[0024] The main switching tube Q1 is connected in series with the parasitic capacitor Coss to the main side of the forward transformer;

[0025] The output rectifier circuit and the output filter circuit are electrically connected to the secondary side of the forward transformer for rectifying and filtering the voltage of the secondary side of the forward transformer and providing it to the load;

[0026] The magnetic reset circuit is connected in parallel with the main side of the forward transformer;

[0027] Or the main switching tube Q1...

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Abstract

The invention relates to a normal shock reset circuit for low voltage input. Due to the fact that, only one capacitor and a diode are used for realizing magnetic reset of a transformer, thus resonant capacitance energy consumption in a resonance magnetic reset circuit is avoided, transfer efficiency, temperature rise performance indexes and the like of a power source are improved, and the circuit is simple, reliable and convenient. According to the normal shock reset circuit for low voltage input, advantages of resonant normal shock and active clamp normal shock are combined, consumption of resonant normal shock and complexity of active clamp normal shock are avoided, and simple engineering realization , low cost and high commercial value are achieved.

Description

technical field [0001] The invention relates to a forward reset circuit, in particular to a forward reset circuit for low-voltage input. Background technique [0002] The forward circuit is the most widely used in the field of small and medium power switching power supplies. It has many advantages such as simple topology, high efficiency, and convenient synchronous rectification. However, it must perform a magnetic reset in each switching cycle, otherwise it will cause magnetic saturation. [0003] Forward circuits currently have many magnetic reset methods, such as reset winding method, RCD method, active clamp method, dual-tube forward method, and resonance reset. The single reset winding method needs to add a reset winding on the primary side, and the switching tube on the primary side needs to withstand twice the input voltage. If the coupling of the reset winding is not good, the peak voltage will be larger; the R in the RCD reset method will cause power loss, resulting...

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Application Information

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IPC IPC(8): H02M3/335
Inventor 单文锋张东来陈淡生
Owner SHENZHEN AEROSPACE NEW POWER TECH
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