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High-stability flyback direct current-direct current (DC-DC) converter

A DC-DC, high-stability technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve problems such as compensation capacitors that cannot be integrated, slow dynamic response speed, and increased circuit area

Active Publication Date: 2013-11-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

while V a The change is through the large compensation capacitor C at the output of the error amplifier c The charge and discharge to achieve, obviously a large compensation capacitor C c directly reduces the V a changes, so the dynamic response speed of the system is very slow
In addition, large compensation capacitors cannot be integrated, which increases the area of ​​the entire circuit

Method used

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  • High-stability flyback direct current-direct current (DC-DC) converter

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Embodiment

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0057] figure 1 A schematic diagram of the hardware connection of the present invention. The converter includes a transformer T, a power switch Sn, an LC filter network 101, a resistance feedback network 102, a current detection unit 103, an error amplifier and frequency compensation circuit 104, and a PWM modulator 105 for control and drive Circuit 106. The power switch Sn is connected to the input power terminal and the logic control and driving circuit 106, the output of the transformer T is connected to the LC filter network 101, and the input is connected to the input power terminal. The LC filter network 101 has an output terminal connected to a resistance feedback network 102 and a current detection unit 103 respectively. The input terminals of the error amplifier (EA) and the frequency compensation module are respectively connected with the output of t...

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PUM

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Abstract

The invention discloses a high-stability flyback direct current-direct current (DC-DC) converter. According to the converter, a voltage feedback loop and a current feedback loop are adopted in flyback topology, so that the transient response of a converter device is accelerated. A novel frequency compensation circuit is also adopted. The frequency compensation circuit mainly comprises an error amplifier, a Miller capacitance control unit and a dynamic zero control unit. According to the Miller capacitance control unit, a large compensation capacitor in the traditional dominant pole compensation can be replaced by a small compensation capacitor, so that the area is saved, and the transient response of the system is improved. According to the dynamic zero control unit, the introduced zero point can well offset the first non-dominant pole of the system under the condition that the output has fluctuation, and the stability of the system is guaranteed. According to the DC-DC converter, a compensation resistor and a compensation capacitor can be integrated to a chip, internal compensation is realized, and the area of the chip is saved; meanwhile, the circuit structure is simple, the reliability is high, the phase margin can be 90 degrees, and the stability of the system is high.

Description

Technical field [0001] The invention belongs to the technical field of switching power supplies, and particularly relates to a high-stability flyback DC-DC converter. Background technique [0002] In portable electronic products, various parts of the system have different requirements for working power, and the power supply of each part is generally supplied separately, so that the independence of each part can be maintained as much as possible. Fly-back switching power supply structure is widely used in portable electronic products, mainly because the structure of fly-back switching power supply is simple, and the use of fewer components can save a lot of cost. At the same time, more importantly, fly-back switch The power supply is easy to achieve multiple outputs, so that a flyback switching power supply control circuit can achieve a variety of different power outputs, which can also reduce the complexity of the circuit, reduce the space of the power supply, and improve the int...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/12
Inventor 江金光汪家轲王江鹏
Owner WUHAN UNIV
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