Dual output DC/DC power supply achieving circuit with zero cross adjustment rate

Abstract

The invention relates to a dual output DC / DC power supply achieving circuit with a zero cross adjustment rate. The dual output DC / DC power supply achieving circuit comprises a direct voltage input end, an input filtering circuit, a first power conversion circuit, a first direct voltage output end, a control circuit, a second power conversion circuit and a second direct voltage output end connected with the second power conversion circuit. The direct voltage input end, the input filtering circuit, the first power conversion circuit and the first direct voltage output end are connected in sequence. The direct voltage input end is connected to the first power conversion circuit and the second power conversion circuit through the input filtering circuit. The control circuit is used for controlling the power conversion of the first power conversion circuit and the power conversion of the second power conversion circuit. The dual output DC / DC power supply achieving circuit can eliminate the influence of the cross adjustment rate fundamentally, can improve the cross adjustment performance under the condition that a dual output power supply is in an asymmetric load or dynamic change power utilization environment, and has high popularization and application value.

Description

Technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to a realization circuit of an output power supply, in particular to a realization circuit of a dual output DC / DC power supply with a zero-cross adjustment rate. Background technique [0002] With the increase in demand for electronic equipment, the improvement of performance and the rapid development of digital processing technology, in many power-consuming environments with unbalanced loads, multiple output converters with good output adjustment performance are increasingly favored by the industry. The cross regulation rate is one of the important performance indicators for evaluating multiple output switching power supplies. It refers to the impact on the output voltage of other channels when the output load of one output changes from no load to full load. The smaller the impact, the better. [0003] Currently, there are two main ways to stabilize the dual-output DC / DC p...

AI Technical Summary

Problems solved by technology

For the first technology, because only the main output is closed-loop controlled, the change of the duty cycle has a great influence on the auxiliary output, especially when the light load changes to full load, the cross-regulation rate is poor (usually > 5%)

However, for secondary voltage regulation (such as linear voltage regulation), the circuit is complex and the efficiency loss is serious, and the volume also increases significantly with the increase of output current; for the second technology, when the two output loads are the same and fixed, the voltage regulation effect Good, but with asymmetrical or dynamically changing loads across the two circuits, cross-regulation gets significantly worse

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