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Active clamp flyback converter and control method

A technology of flyback converter and control method, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, instruments, etc., can solve problems such as low efficiency, achieve elimination of high-frequency oscillation, good EMI characteristics, and improve The effect of light load efficiency

Active Publication Date: 2020-04-17
MORNSUN GUANGZHOU SCI & TECH
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Problems solved by technology

[0011] Aiming at the low efficiency of the above-mentioned active clamp flyback converter at light load, the present invention starts with improving its control method, and provides a soft switch that can realize the soft switching of each switching tube, optimize EMI, and at the same time ensure a higher Light load efficiency control method

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  • Active clamp flyback converter and control method

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Embodiment 1

[0052] The circuit schematic diagram of the active clamp flyback converter of the first embodiment is as follows Figure 5 As shown, the active clamp flyback converter of Embodiment 1 includes a main power circuit, a clamp circuit and an output filter circuit. The main power circuit is composed of a transformer (Lr and Lm are integrated in the transformer) and the main switch tube Q1. The first terminal of the primary winding of the transformer is the positive input terminal Vin+ of the circuit, and the second terminal of the primary winding of the transformer is connected to the drain of the main switch tube Q1. The pole (d pole) is connected, and the source (s pole) of the main switching transistor Q1 is the negative input terminal Vin-. The clamping circuit is composed of clamping capacitor Cr, clamping diode D4 and clamping tube Q2. The clamping circuit is connected in parallel with the primary winding of the transformer. The cathode of clamping diode D4 is connected to on...

Embodiment 2

[0069] The circuit schematic diagram of the active clamp flyback converter of the second embodiment is as follows Figure 8 As shown, the active clamp flyback converter of the second embodiment includes a main power circuit, a clamp circuit and an output filter circuit. The main power circuit is composed of a transformer and a main switching tube Q1. The first terminal of the primary winding of the transformer is the positive input terminal of the circuit. The second terminal of the primary winding of the transformer is connected to the drain (d pole) of the main switching tube Q1. The main switching tube The source (s pole) of Q1 is the negative input terminal. The clamping circuit consists of a clamping capacitor Cr, a main clamping tube Q4, a clamping diode D4, an auxiliary capacitor Cs and an auxiliary clamping tube Q3. The drain (d pole) of the clamp diode D4 is connected to the other end of the clamp capacitor Cr and then connected to the positive input terminal of the ...

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Abstract

The invention discloses an active clamp flyback converter and a control method, and aims to solve the problem of low efficiency of an existing active clamp flyback converter during light load. Firstly, the control method is improved, and the control method that soft switching of each switching tube can be realized, EMI is optimized, and high light load efficiency can be guaranteed is provided, andthen the active clamp flyback converter which can achieve soft switching of all switching tubes, optimize EMI and guarantee high light load efficiency is provided by starting from the circuit structure and the control method of the active clamp flyback converter. The main content of the control method is that frequency conversion control is adopted for the active clamp flyback converter, and evenif the working frequency of the circuit changes along with the load, a frequency conversion control scheme is selected according to the relationship between the total loss of the circuit and the working frequency of the circuit.

Description

technical field [0001] The invention relates to the field of switching converters, in particular to an active clamp flyback converter and a control method. Background technique [0002] With the rapid development of power electronics technology, switching converters are used more and more widely, and people put forward more requirements for switching converters with high power density, high reliability and small size. The flyback topology has the advantages of simple structure and low price, and is widely used in low-power switching converters. However, the common flyback topology is a hard switch and cannot recover leakage inductance energy, thus limiting the efficiency and volume of the common flyback topology. In order to seek a breakthrough in the size and efficiency of low-power switching converters, soft switching technology has become a research hotspot in power electronics technology. [0003] At present, the representative flyback topology that can realize soft sw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/38H02M1/44
CPCH02M1/38H02M1/44H02M3/33569H02M1/0058Y02B70/10
Inventor 尹向阳钟天明马守栋王志燊
Owner MORNSUN GUANGZHOU SCI & TECH
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