1 Introduction
With the development of miniaturization technology for aerospace engineering and other electronic engineering systems, the power supply system of the whole machine began to adopt a distributed power supply design scheme consisting of a hybrid integrated DC/DC power converter, replacing the traditional power supply consisting of discrete components. the way. The military hybrid integrated DC/DC power converter is widely used in military electronic control systems due to its small size, light weight, high power density, high efficiency and high reliability. The dual output is a common output form of the DC/DC power converter. Generally, the output has the main and auxiliary branches. There are certain requirements for each of the two outputs, such as dual output load balancing or secondary loading. When the main path cannot be idling, etc., there is a so-called cross regulation rate problem, which limits the use of the dual output DC/DC converter. In some specific cases, the DC/DC converter dual output is required to be separated from the main and auxiliary circuits and output independently of each other. This paper mainly introduces the design idea, implementation method and research results of low ripple dual output DC/DC power converter.
2 program design
According to the special requirements of the dual independent output, after in-depth analysis of the dual output DC/DC converter topology, the circuit scheme for implementing the dual independent output DC/DC converter is determined. There are four circuit schemes for implementing dual output DC/DC converters. Their electrical block diagrams are shown in Figure 1, Figure 2, Figure 3, and Figure 4, respectively.
Figure 1 Electrical block diagram of Option 1
Figure 2 Electrical block diagram of Option 2
Figure 3 Electrical block diagram of Option 3
Figure 4 Electrical block diagram of Option 4
Scheme 1 is a circuit topology with one output using feedback, and a circuit topology with a post-regulation for the other; scheme 2 is a circuit topology with both outputs after post-regulation; scheme 3 is the difference sampling of the two outputs. The optocoupler isolation feedback is used to realize the circuit topology of the two output voltage regulators; the scheme 4 is the difference sampling of the two outputs, and the circuit topology of the two output voltage regulators is realized through the transformer isolation feedback.
The circuit forms of the input side of the high-frequency transformer of these four schemes are basically the same, and the difference is the output feedback mode and path. Table 1 compares the characteristics of the four schemes. It can be seen that scheme 2 has the characteristics of two independent outputs and zero cross-adjustment rate.
Table 1 Comparison of characteristics of four schemes
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