Switching power supply
A switching power supply and switching circuit technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve problems such as difficulty in setting and preventing resonance from deviating from Fmin, achieve magnetic flux amplitude suppression, excitation current suppression, and reduce magnetic flux. The effect of core loss
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[0072] figure 1 A circuit diagram showing a switching power supply device according to a first embodiment of the first aspect of the present invention.
[0073] and Figure 5 The difference of the circuit is that a series resonant circuit is formed between the inductance components of the transformers T1 and T2, the inductance element Lz and the capacitor Cr, and the control circuit Cont1 is made to perform frequency control with an on-duty ratio of 0.5. That is, although on the circuit with Figure 5 same, but in Figure 5 There is no series resonant circuit formed in it. Additionally, usually with figure 1 and Figure 5 The elements Q1 and Q2 are connected in parallel with parasitic capacitance and internal inductance, but the illustration is omitted here.
[0074] Below, refer to figure 2 waveform diagram of the figure 1 The circuit operation will be described.
[0075] When Q1 and Q2 are switched, the inductance element Lz performs a partial resonant operation wit...
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