Switch power buffer
Switching power supply, also known as switching power supply, switching switch, is a high-frequency electrical energy conversion device, is a power supply. The switching transistors used in Keller switching power supplies mostly switch between full-on mode and full-closed mode, both of which have low dissipation characteristics. Between switches
The conversion will have a higher dissipation, but the time is very short, and all Keller switching power supplies are more energy efficient and produce less waste heat. The high conversion efficiency of Keller switching power supply is one of its major advantages, while the operating frequency is high, small size and light weight transformers can also be used, and the weight of the switching power source will be relatively light. Keller switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting and other fields.
LD buffer characteristics: Without the need to match the absorption circuit, the current stress of the buffer discharge diode is equal to or even greater than the current stress of the topological continuous current diode. Buffer energy release diode loss is reduced. Appropriate buffer inductance parameters can reduce the loss of the switching tube and achieve high efficiency.
LR buffer characteristics: An absorbing circuit is required to transmit the remaining energy of the inductor. The loss of the buffer discharge resistance R is very large, which can be simply understood as the loss transferred from the switch tube. R is difficult to master parameter design and debugging. As long as the parameters are suitable, high efficiency can still be achieved.
Saturated inductance buffer:
Sensitivity to the electrical properties of saturated inductors. At the rising edge of the impulse current, the large impedance begins to appear, and gradually enters the saturation state with the increase of the current, thus delaying and weakening the peak of the surge current, that is, achieving soft on-off. When the current reaches a certain level, the saturated inductor exhibits a very low impedance due to saturation, which is conducive to the effective transmission of the power. When the current reaches a certain level, the saturated inductance is in a saturated state. On the one hand, the previously saturated inductance is small, that is, the required energy storage and energy release are small. On the other hand, the recovery of inductance can slow down the rise rate of voltage, which is conducive to the realization of soft shutdown.
