Switch-over type power change-over circuit switable to wide-range and high-voltage input

Abstract

The switching type power-switch circuit includes multiple switching type power-switch circuit units suitable for lower input voltage range. Cascaded primary circuits in units are jumped on input power supply in high voltage. Paralleled secondary circuits in units are jumped on load. The cascaded structure adapts to high input voltage. Paralleled structure can distribute balanced input high voltage and output power among conversion unit evenly. It is easy to add a circuit to prolong holding time in the structure. Retracing energy of magnetic elements from each conversion unit is stored in a capacitor. When input power is interrupted, the stored charge in capacitor is in use for keeping the input voltage at lower prearranged value so as to prolong holding time. Capacitor with lower withstand voltage value is usable since operating voltage of capacitor is allowed to lower peak value of input voltage range so as to reduce cost and size.

Description

technical field [0001] The present invention relates to a switchable power conversion circuit, in particular to a conversion circuit which utilizes the switching action of a switching unit to achieve power transmission. Background technique [0002] When the input voltage of the existing switching power conversion circuit is higher than the AC 300V effective value or 420V peak value, the energy storage capacitor used at the input end of the circuit must have a withstand voltage capability of more than 450V, which is a non-universal withstand voltage value, so Such capacitors are expensive and rare. [0003] The same problem also occurs in switching devices. The circuit topologies of switching power conversion circuits are generally half-bridge, full-bridge, single-ended forward and flyback. type (fly-back), etc., when used in household electricity (AC 230V), the withstand voltage requirements of the switching devices only need to be slightly higher than the peak value of ho...

AI Technical Summary

Problems solved by technology

[0013] The output inductor mentioned above needs to add a secondary winding Ns, and the secondary winding Ns needs to be connected to the input circuit of the power converter, so that the output inductor is between the primary and secondary circuits, and there must be safety The required insulation capacity is specified, so the production of the output inductor becomes difficult and expensive

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