Switching power-supply device
A switching power supply, switching frequency technology, applied in the direction of output power conversion devices, electrical components, adjusting electrical variables, etc., can solve the problems of increased conduction loss, increased loss, and increased on-duty ratio of switching components. The effect of reducing switching loss, reducing current ripple, and reducing conduction loss
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Embodiment approach 1
[0042] figure 1 It is a circuit diagram of the switching power supply device according to Embodiment 1. The switching power supply device 101 is configured such that a non-isolated converter is provided at the front stage and an isolated bridge converter is provided at the rear stage. In this embodiment, the non-isolated converter is a boost converter circuit 10 , and the isolated bridge converter is a half-bridge converter circuit 20 . The switching power supply device 101 converts the DC input voltage Vi input from the input terminals Pi(+) and Pi(-) into an output voltage Vo, and supplies it to a load (not shown) connected to the output terminals Po(+) and Po(-). ). The smoothing capacitor Ci and the boost converter circuit 10 are connected to the input terminals Pi(+) and Pi(−).
[0043] The boost converter circuit 10 is composed of an inductor L1 , an n-type MOSFET (hereinafter referred to as FET) 11 , a diode D1 , and a smoothing capacitor C1 . The first end of the i...
Embodiment approach 2
[0070] figure 2 It is a circuit diagram of the switching power supply device 102 according to Embodiment 2. In Embodiment 1, the current flowing through the load is detected on the secondary side of the transformer, and the feedback voltage Vfb2 is input to the subsequent stage SW control circuit 40. Compared with this, the difference in Embodiment 2 is that the current flowing through the primary side of the transformer is Excessive current is detected. In addition, the place where the current is detected on the primary side of the transformer may be appropriately changed. For example, the current flowing through the FET21 or FET22 can be detected, and the current flowing through the primary winding np can also be detected. In addition, it is possible to detect not only the current flowing through the FET11 but also the current flowing through the inductor L1.
[0071] In this embodiment, since the current is detected on the primary side of the transformer, an insulating ...
Embodiment approach 3
[0073] image 3 It is a circuit diagram of the switching power supply device 103 according to Embodiment 3. The switching power supply device 103 includes a full-bridge converter circuit 50 instead of the half-bridge converter circuit 20 according to the first and second embodiments.
[0074] The full bridge converter circuit 50 includes FETs 51 , 52 , 53 , and 54 . The FETs 51 , 52 , 53 , 54 are in a bridge configuration, and the primary winding np is connected at the connection point of the FETs 51 , 52 and at the connection point of the FETs 53 , 54 . Specifically, a series circuit is formed by FET51 , primary winding np, and FET54 , and is connected to the input portion of the full-bridge converter circuit 50 . In addition, a series circuit is formed by FET53, primary winding np, and FET52, and is connected to the input part of the full-bridge converter circuit 50.
[0075] In the full-bridge converter circuit 50 , the subsequent stage SW control circuit 40 turns on / off...
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