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A sampling compensation circuit and primary-side feedback flyback converter

A compensation circuit and differential circuit technology, which is applied in the direction of adjusting electric variables, converting DC power input to DC power output, and instruments, can solve problems such as poor load adjustment rate, achieve small number of components, simple circuits, and small products effect

Active Publication Date: 2020-07-03
XIAN MICROELECTRONICS TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The invention provides a sampling compensation circuit and a primary-side feedback flyback converter, which solves the problem of poor load regulation under the primary-side feedback control mode, and the circuit structure is simple

Method used

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  • A sampling compensation circuit and primary-side feedback flyback converter
  • A sampling compensation circuit and primary-side feedback flyback converter
  • A sampling compensation circuit and primary-side feedback flyback converter

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] refer to Figure 4 , the sampling compensation circuit consists of a resistor R 1 - Resistor R 5 , capacitance C 1 , capacitance C 2 , NMOS tube Q 1 , NMOS tube Q2 and diode D3. Capacitance C 1 And diode D3 is connected to the auxiliary winding V of the transformer in the flyback converter a , resistor R 5 Connect to auxiliary power supply V o2 , the common terminal of NMOS transistor Q1 and capacitor C2 is the compensation voltage V c , capacitance C 1 , resistance R 1 and resistor R 2 Form a differential circuit, diode D3, resistor R 3 and resistor R 4 constitute a limiting circuit.

[0038] Capacitance C 1 One end and resistor R 1 Connected at one end, the resistor R 1 The other end of the resistor R 2 connected at one end, the resistor R 2 The other end is grounded; capacitor C 1 The other end is connected to t...

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Abstract

The invention discloses a sampling compensation circuit and a primary side feedback flyback converter, A sample compensation circuit includes an NMOS transistor Q1, an NMOS transistor Q2, a differential circuit and a limiting circuit; the drain of the NMOS transistor Q1 is connected to one end of the resistor R5, The other end of resistor R5 is used to connect to the auxiliary power supply Vo2. the source of the NMOS transistor Q1 is connected to the drain of the NMOS transistor Q2, the gate of the NMOS transistor Q1 is connected to a limiting circuit, The source and drain of the NMOS transistor Q2 are connected to the two terminals of the capacitor C2, the gate of the NMOS transistor Q2 is connected to a differential circuit, and the common terminal of the NMOS transistor Q1 and the capacitor C2 is a compensation voltage Vc, which solves the problem of poor load regulation under the primary side feedback control mode, and the circuit structure is simple.

Description

technical field [0001] The invention belongs to the technical field of DC / DC converters, and in particular relates to a sampling compensation circuit and a primary side feedback flyback converter. Background technique [0002] The isolation feedback method in the DC / DC converter includes the primary side feedback method and the secondary feedback method. As the power density and conversion efficiency of switching power supplies are getting higher and higher, the circuit structure is gradually developing in a more simplified direction. The primary side feedback control method, the error signal is taken from the previous stage, which can save the optocoupler or isolation transformer. Compared with the secondary feedback control method, it has the advantages of simple structure, small size and fewer components. In the low power level DC / DC Converters are widely used. [0003] For the primary-side controlled single-ended flyback topology, it is mainly composed of the main tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33569
Inventor 王凯谢树杨许拴拴王俊峰
Owner XIAN MICROELECTRONICS TECH INST