Efficient AC-DC power source converter

Abstract

The present invention belongs to the power source converter field and relates to an efficient AC-DC power source converter. The efficient AC-DC power source converter comprises an PFC circuit; the PFC circuit is connected with a DC/DC converter through an intermediate voltage bus-bar; the intermediate voltage bus-bar is provided with a positive pole end and a negative pole end; the intermediate voltage bus-bar is connected with a bus-bar capacitor; one end of the bus-bar capacitor is connected with a bi-directional DC/DC converter; the other end of the bus-bar capacitor is connected with the negative pole end of the intermediate voltage bus-bar; and the bidirectional DC/DC converter is connected with the positive pole end of the intermediate voltage bus-bar. The power balance of input and output can be realized through controlling the bidirectional DC/DC converter; the voltage of the bus-bar capacitor can have a wide change range; and therefore, energy stored in the bus-bar capacitor can be fully utilized, the fluctuation of the voltage of the intermediate bus-bar will not be too large, and the high conversion efficiency of later-stage DC/DC can be maintained.

Description

technical field [0001] The invention relates to the field of power converters, in particular to AC-DC converters. Background technique [0002] The AC-DC power converter is the core component of the power system of electronic equipment. The AC / DC power converter mainly completes two major functions: one is to ensure that the AC / DC input current remains intact under any electrical load. Sine wave, and in phase with the input voltage, to obtain a complete power factor, thereby reducing the burden on the grid or generator, that is, the requirement of power factor correction (PFC). The second is to ensure that under any power supply situation, a stable DC voltage is output, and in the case of AC power failure, it can continue to output DC voltage for a period of time, so that there is enough processing time for subsequent electrical equipment, that is, voltage stabilization and Power-down hold-up time requirements. [0003] see figure 1 , the usual AC / DC converters adopt a tw...

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Problems solved by technology

[0004] With the requirements of energy saving and miniaturization of equipment, AC / DC converters are also required to have higher conversion efficiency and smaller volume. Increasing the switching operating frequency can reduce the volume of magnetic components, but cannot reduce the capacity of bus capacitance. Because the capacity of the bus capacitor is only related to the frequency of the input AC, it is almost independent of the switching frequency

The volume of the bus capacitor has become the bottleneck of the miniaturization of AC / DC power converters. In addition, this capacitor can only be used as an electrolytic capacitor due to capacity requirements. The life and temperature problems of electrolytic capacitors are usually limited to aerospace or other requirements. Therefore, reducing the bus capacitance is very practical in the design of AC-DC power supplies

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