DC power circuit analysis and design methods in recent years www.kayandz.com Snubber circuit has made great progress, but adjustable DC power supply current to optimize its performance has not been reasonable, its application is not satisfactory. This is mainly due to the field staff did not attach great importance to limit the application of the basic types RCDSnubber, relevant properties and use, nor pay attention to theory RCDSnubber circuit analysis, but their experience and practical engineering commissioning, which reduces the engineering design to a certain extent efficiency. Finally, the experimental method is proposed to optimize the design of the circuit. 1, the voltage clamp mode RCDClamp Unlike Snubber model, which aims to limit switch off maximum instantaneous peak voltage across it, and the switch itself is essentially the same loss. Voltage clamp mode RC discharge time constant longer than the working principle of the voltage rise rate inhibition mode. 2, inhibition of voltage rise rate mode for power MOSFET in terms of its current rate of decline is much faster than the GTR or IGBT, the turn-off losses in value than the GTR or small IGBT, but the loss of the entire small power supply system is also can not be ignored. Therefore proposed to suppress the rate of voltage rise RCDSnubber. Switch off in an instant, the flyback transformer leakage inductance current needs original initial direction continues to flow, the current will be divided into two: one in the gradual shutdown of the switch continues to flow; the other way through the Snubber circuit capacitance diode Ds Cs charging. As the voltage on Cs can not be mutated, thus reducing the turn-off voltage rise rate, and to switch off the power loss is transferred to the Snubber circuits. If Cs is large enough, the intersection area and the current rise voltage drop switch formed will be further reduced, to further reduce turn-off loss of the switch tube. But Cs values ??can not be too large because the starting point of each shutdown period (the end point is the opening period), Cs must be exhausted to the voltage rise rate charge for effective inhibition; but during the off end point, Cs which can reduce the switch voltage rise time, it will eventually reach its terminal voltage () (to ignore leakage inductance voltage spike when, as the secondary voltage of the primary reflection). Instantly adjustable DC power supply is turned off tube, Cs will be discharged through the loop resistance Rs and M formed. Snubber discharge current will flow through the switch, a current surge will be generated, and if the duty cycle at a time is narrowed, the capacitor charge will not be exhausted and not to reduce turn-off loss purposes. Visible, Snubber circuit only switching instants of transition in the work, reduces the loss of the switch tube, improves the reliability of the circuit, slowing down the rate of voltage rise also reduces high-frequency electromagnetic interference. http://www.kayandz.com power inverter power supply, DC power supply manufacturers http://www.agjixie.com shears, shears, hydraulic shears tilting vacuum http://www.hhnhj.com kneading machine, kneading machine http://www.szyx1990.com full height turnstiles, swing gates