Green laser pointer can be developed for another focusable type

The input filter capacitor. The greater the input capacitance, the stronger the resistance from the power grid disturbance; but the input filter capacitor greater the higher the cost, and also by the internal chassis space and PCB size limit. The actual choice of the principle of the input filter capacitor voltage fluctuation does not exceed 10% of the average voltage. Accurate calculation of this capacitance charge and discharge curve is almost impossible, because the subsequent load is non-linear load. Empirical formula in the industry, the the 1uF capacity of 1W power. The maximum output power of this power is 6000W, the actual use of very little work in this state. Therefore, we chose two 2200uF/450V Hitachi electrolytic capacitors. The IGBT. Since the maximum output current of 30A, while the inductor current fluctuations. It is the life time of the battery of green laser pointer .
Thus the passage of current of the IGBT at least more than 30A. IGBT's internal resistance is generally the 0.1Ω about, consider the margin of the current capacity and the heat loss of the device, select the current 100A IGBT. Specific model the SEMIKRON of IGBT Modules SKM 100GB 124D, key performance indicators are as follows: Note that the current capacity refers to the value of the IGBT in the temperature of 85.C. The freewheeling diode capacity. Two of the IGBT SEMIKRON SKM 100GB 124D module. Used for switching devices, and other parasitic anti-parallel diode of the freewheeling diode. Therefore, the freewheeling diode current capacity to meet demand. IGBT internal parasitic body diode reverse recovery time is longer. Also, the customer can give some suggestion about the use and operation of green laser pointer .
Conduction as of the time is too long will cause too large, the switching losses of IGBT overheating. The output filter inductor. The power output requirements for constant current output, the output filter inductor which should in theory infinite, but in fact also subject to cost and space constraints, output Green Wave inductance can not be infinite. Average inductor current is equal to the final output current, in the case of the regulated output, the maximum may take the fluctuations of the inductor current value of 60% of the average, what is more, it is possible the inductor current is discontinuous, but in The constant current output, which is absolutely not allowed to appear. Select the inductor current fluctuations in value of the average of 10% []. As the maximum output current of 30A, the maximum fluctuation of the inductor current is 3A. Grid voltage is 220V. For example,  green laser pointer can be developed for another focusable type.
Rectified DC voltage is 300V, 30V. Overloaded when the pressure drop Assumptions 30A current output voltage of 200V, the input voltage output voltage of the Buck circuit inductor current continuous duty cycle, Vout = D * Vs obtained D = 0.74. Inductor voltage and current relations are as follows. The formula ignores the small changes in the length of time of the switching cycle of the input and output voltage. Solution have inductance L = 0.69mH take the inductance is 0.7mH. 0.7mH inductor spot market. Calculate the inductance of the winding diameter. To calculate the diameter of the inductor current can not use the average current to calculate the RMS. Calculate the inductance diameter consider the inductor loss, iron loss and copper loss. The iron loss is caused by the magnetic flux refers to the inductor core loss. And the appearance of green laser pointer can be enhanced.
Copper loss inductor current flows through the wire, the wire resistance, inductance, the internal resistance of the wire can not be ignored. Ideally, the iron loss of the inductor should be equal to the copper loss, then the loss of the inductor, the heat is []. Inductor current due to the filtering effect of the inductor itself, are basically the DC component, but the AC component still exists, and the large amplitude high-frequency AC component will cause great loss, multi-strand high-frequency filter inductor fine enameled wire or copper skin and around. Multi-strand wire, on the one hand, can reduce the internal resistance of the winding, on the other hand, due to the high-frequency current skin effect, the use of thin wires can improve the utilization of wire. Much care and novel design are applied to green laser pointer .