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Normal shock reset circuit for low voltage input

A technology of reset circuit and low-voltage input, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, electrical components, etc., can solve the problems of complex structure and low feedback efficiency of reset parameters, and achieve simple engineering implementation, Avoid the effect of energy consumption and temperature rise performance index improvement

Active Publication Date: 2015-07-22
SHENZHEN AEROSPACE NEW POWER TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] 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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Embodiment Construction

[0019] The technical solutions of the present invention will be further described below with reference to specific embodiments.

[0020] like figure 1 As shown in the figure, the specific embodiment of the present invention is to construct a forward reset circuit for low voltage input, including a main switch Q1, a parasitic capacitance Coss, a forward transformer TX, an output rectifier circuit, an output filter circuit, and a magnetic reset circuit. ;

[0021] The main switch tube Q1 is connected in parallel with the parasitic capacitance Coss and is electrically connected to the main side of the forward transformer;

[0022] The output rectifying circuit and the output filtering circuit are electrically connected to the secondary side of the forward excitation transformer for rectifying and filtering the voltage of the secondary side of the forward excitation transformer and then supplying it to the load;

[0023] the magnetic reset circuit is connected in parallel with t...

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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 excitation reset circuit, in particular to a forward excitation reset circuit for low voltage input. Background technique [0002] The forward circuit is the most widely used in the field of medium and small power switching power supplies. It has many advantages such as simple topology, high efficiency, and convenient synchronous rectification. However, it must perform magnetic reset in each switching cycle, otherwise it will cause magnetic saturation. [0003] There are many magnetic reset methods for forward circuit, 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 primary side switch tube needs to withstand twice the input voltage. If the reset winding is not well coupled, the peak voltage will be larger; R in the RCD reset method will generate power loss, resulting i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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