Compensation system suitable for problem of early turn-off of secondary side rectifier tube of converter
A technology of early shutdown and compensation system, applied in the field of compensation system, can solve the problems of increasing conduction loss, reducing converter efficiency, reducing converter efficiency, etc., to expand the application range, solve the problem of early shutdown and reduce amplitude Effect
Pending Publication Date: 2022-05-17
SHANGHAI JARI INFORAMTION SCI & TECH
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And because the phase of the inductive voltage component is ahead of the resistive voltage component, it will cause the secondary rectifier tube Q 5 When its current has not dropped to zero, it will be turned off early. At this time, the current will flow through its body diode, which will increase the loss and reduce the efficiency of the converter.
In order to solve the secondary side rectifier tube Q 5 The problem of early shutdown, the secondary side rectifier tube Q 5 You can choose a device with a larger on-resistance, but a larger on-resistance will increase the conduction loss and reduce the efficiency of the converter, especially in applications where the output current of the converter is large
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[0027] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0028] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination ...
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The invention discloses a compensation system suitable for an advanced turn-off problem of a secondary side rectifier tube of a converter. The compensation system comprises the secondary side rectifier tube, a compensation network and a synchronous rectification controller, the input end of the compensation network is connected in parallel with the drain-source electrode of the secondary rectifier tube, and the output end is used as the input of the synchronous rectification controller. The compensation network specifically comprises a resistor, a capacitor and two diodes. By adding the compensation network, the problem that the secondary side rectifier tube is turned off in advance due to packaging parasitic inductance of the secondary side rectifier tube is effectively solved, the system is easy to implement, the problem that the secondary side rectifier tube is turned off in advance can be effectively solved, and the efficiency of the converter is improved.
Description
technical field [0001] The invention belongs to the technical field of converters, in particular to a compensation system suitable for the problem of early shut-off of a rectifier tube on the secondary side of a double-clamp zero-voltage switching converter. Background technique [0002] Double-clamp zero-voltage switching converter is an isolated DC / DC circuit topology, which is widely used in communication and military power supply fields due to its simple structure, high efficiency, isolation of primary and secondary sides, and wide input and output ranges. Such as figure 1 The double-clamped zero voltage switching converter shown. For an isolated double-clamp zero-voltage switching converter, when the output current is small, its secondary rectifier Q 5 Diodes can be used for rectification; but when the output current is large, if the diode is still used for rectification, it will bring serious conduction loss. At this time, the secondary rectifier tube Q 5 Requires t...
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IPC IPC(8): H02M3/335H02M1/088
CPCH02M3/33592H02M1/088
Inventor 王亚洲徐大林仲羿诚王廷营刘文煜李伟鹏孟杰李春鹏陆杨军朱民杰唐海瑞杨涛
Owner SHANGHAI JARI INFORAMTION SCI & TECH