Synchronous rectification switching power supply
A synchronous rectification switch and synchronous rectification technology, which is applied in the direction of high-efficiency power electronic conversion, conversion equipment with intermediate conversion to AC, climate sustainability, etc., can solve the self-excited oscillation of the secondary side circuit, the main switching element or synchronous rectification Component damage, large loss and other problems, to achieve the effect of increasing switching frequency, preventing through current, and reducing miniaturization
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[0026] Embodiments of the present invention will be described below with reference to the drawings. figure 2 A circuit of the flyback type synchronous rectification switching power supply device according to the first embodiment of the present invention is shown. In this switching power supply circuit, a DC power supply 10 is connected between input terminals 11 and 12, and a primary winding N1 of a transformer T and a main switching element Q1 of a MOS-FET are connected in series. On the input terminal 11 of the positive end of the DC power supply 10, a terminal generating a positive voltage when the main switching element Q1 is turned on is connected to the terminal on the dotted side of the primary coil N1, and the terminal on the non-dot side of the transformer T. is connected to the drain of the main switching element Q1. In addition, the source of the main switching element Q1 is connected to the input terminal 12 of the negative terminal of the DC power supply 10, and...
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