Switching power supply unit
A switching power supply and switching technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve problems such as abnormal loss, exceeding withstand voltage, and impact, and achieve the continuous effect of preventing self-excited oscillation
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[0044] Hereinafter, the form for implementing this invention is demonstrated in detail, referring drawings.
[0045] Figures 4 to 8 It is a figure which shows embodiment of the switching power supply apparatus of this invention.
[0046] First, use Figure 4 The circuit configuration of the switching power supply device of the present embodiment will be described. Figure 4 The switching power supply device includes: a main transformer T1, which has primary side and secondary side insulation, a primary side main coil Np, a secondary side main coil Ns1, and an independently set auxiliary coil Ns2; a main switch Q1, which is in the input DC The voltage is connected in series with the primary side main coil Np; the control circuit generates / outputs the driving pulse for ON / OFF driving of the main switch Q1; the self-excited mode is composed of the rectification switch Q3 and the commutation switch Q4. A synchronous rectification circuit, in which the rectification switch Q3 i...
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