An isolated power conversion device
A power conversion and isolation technology, applied in output power conversion devices, regulating electrical variables, converting DC power input to DC power output, etc. The effect of low voltage stress, large range and simple topology
Active Publication Date: 2019-05-03
奇普电源(常州)有限公司
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Problems solved by technology
The characteristics of the forward converter using the reset winding: the advantage is that the structure of the converter is relatively simple, and the magnetization energy can be fed back to the input source without loss; the disadvantage is that the voltage stress of the switching tube is high, generally twice the input voltage
Large current and voltage spikes will be generated when the switch tube is turned on and off, causing EMI problems
Method used
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[0019] The embodiment of the present invention provides an isolated power conversion device, which provides an optimal solution to the magnetic reset problem of the forward converter in the known technology, realizes high-efficiency lossless reset, and broadens the scope of the forward converter. The duty cycle of the main power switch tube, . In order to make the content of the present disclosure easier to understand, the following specific embodiments are taken as examples in which the present invention can indeed be implemented. In addition, wherever possible, components / members / steps with the same reference numerals are used in the drawings and embodiments to represent the same or similar parts.
[0020] figure 2 It is an embodiment of the present invention. In this embodiment, the isolated power conversion device includes a forward conversion circuit 21 and a flyback circuit 22, and the forward conversion circuit includes a main control switch Q, an isolation transforme...
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The invention discloses an isolated power transformation device, comprising a forward transformation circuit and a reverse excitation circuit, wherein the forward transformation circuit comprises a primary side switching circuit, an isolated transformer and a secondary side output circuit; the primary side switching circuit, the reverse excitation circuit and a primary winding of the isolated transformer are connected in series; the secondary side output circuit is connected in parallel to a secondary winding of the isolated transformer; the isolated power transformation device is characterized in that the reverse excitation circuit comprises a reverse excitation winding and an energy storage capacitor which are connected in parallel to each other, and the dotted terminal of the reverse excitation winding is same as that of the primary winding. The reverse excitation circuit realizes magnetic reset of the forward transformation circuit, and has the advantages of high efficiency and simplicity, so that the isolated power transformation device is high in power density and large in size.
Description
technical field [0001] The invention relates to isolated power conversion technology, in particular to a forward power conversion device. Background technique [0002] The transformer magnetic reset problem is a unique problem of the forward converter. The transformer needs to perform magnetic reset when the switch tube is turned off, so as to ensure that the excitation magnetic flux returns to the initial value at the beginning of each switching cycle, so as to avoid the continuous rise of the magnetic flux. lead to saturation of the transformer core. Aiming at the problem of magnetic reset of the converter, various solutions have been proposed at present. The existing typical magnetic reset technologies of forward converters include: (a) reset winding method; (b) RCD reset method; (c) active clamp Bit reset mode; (d) resonant reset mode; (e) magnetic reset path with diode structure. [0003] Among them, the reset winding mode is a typical forward converter circuit that u...
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IPC IPC(8): H02M3/335
CPCH02M3/335
Inventor 孙巨禄徐明周军
Owner 奇普电源(常州)有限公司