TOP250y在大功率开关电源中的应用室外一体化电源机柜,高频开关电源，-48V开关电源

        取初级匝数约为36 匝。  

        c. 计算变压器次级绕组匝数  

        取次级匝数约为5 匝，并在绕制工艺上采用铜箔绕制，这样既满足了大电流输出，又解决了趋肤效应问题。  

        d. 计算变压器初级绕组上的最大峰值电流  

TOP250Y的标称电流为6A，所以设计是完全合理的。  

        e. 计算变压器磁芯的气隙长度  

     取Lg=0.12cm，在加工工艺上采用磨制气隙工艺，以保证加工的可靠性和可行性。  

功率二极管的设计 

UDR≥(5～6)Uo，在120～144V之间取值。  

        本例中V4 实际选用超快速二极管MUR3020(15A/200V)，完全符合设计要求。  

输出滤波电容的设计 

        输出滤波电容等效ESR 可用下列经验公式计算设计  

依据上述计算参数及耐压要求，查手册实际选用四只35V/1000μF电容并联，其等效ESR 约为0.017Ω，满足设计要求。  

尖峰吸收电路和环路控制频率补偿电路的设计 

尖峰吸收电路和环路控制频率补偿电路的设计也可由相应公式得到，但由于电路元器件参数差别和加工工艺的影响，上述两种电路参数的设计还需要大量实验数据验证，因此仅给出本电源设计的参数，这里就不再赘述了。  

试验结果  

        通过用LeCroy公司生产的电源专用示波器测试，得到本电源设计的主要试验结果如下：  

        Po = 290.402W；空载功耗≤1.48W； 线性调整率≤±0.97%；负载调整率≤±1.74%； 纹波≤0.95%；效率≥86.1%。  

结 语 通信电源,室内通信电源机柜,室外通信电源机柜,室外壁挂通信电源机柜,室内壁挂通信电源机柜,嵌入式通信电源系统,整流模块,监控模块,BBU,RRU,逆变器,室外一体化UPS电源,UPS不间断电源,48V50AH锂电池,蓄电池,蓄电池架,蓄电池柜,蓄电池巡检仪,蓄电池连接线, 交流配电单元,直流配电单元,交流配电箱, 局端嵌入式直流远供电源系统, 远端嵌入式直流远供电源系统 ,室外一体化电源机柜,高频开关电源，-48V开关电源 

        根据上述理论， 成功设计了一种新一代TOPSwitch控制的大功率开关电源。不仅证明了设计方法的正确，而且整个电路设计简洁，电源可靠性也得到很大提高。随着对TOPSwitch的进一步研究，由新一代TOPSwitch控制的大功率开关电源必将得到更加广泛的应用。

The number of primary turns is about 36 turns.

C. calculation of the number of secondary winding turns of transformer

The number of secondary turns is about 5 turns, and copper foil is used for winding the winding process, which not only satisfies the high current output but also solves the skin effect problem.

D. calculate maximum peak current on primary winding of transformer

The nominal current of TOP250Y is 6A, so the design is completely reasonable.

E. calculation of air gap length of transformer core

Take Lg=0.12cm and adopt the air gap process to ensure the reliability and feasibility of the process.

Design of power diode

UDR is equal to (5~6) Uo and values between 120 and 144V.

In this case, V4 actually selects ultra fast diode MUR3020 (15A/200V), which fully meets the design requirements.

Design of output filter capacitor

The equivalent ESR of output filter capacitor can be calculated by the following empirical formula.

According to the above calculation parameters and pressure requirements, four 35V/1000 F capacitors are connected in parallel with the equivalent ESR of 0.017 ohms, which meets the design requirements.

Design of spike absorption circuit and loop control frequency compensation circuit

The design of the peak absorption circuit and the loop control frequency compensation circuit can also be obtained by the corresponding formula. However, due to the difference of the parameters of the circuit components and the influence of the processing technology, the design of the above two circuit parameters also needs a large number of experimental data to verify the parameters. Therefore, only the parameters of the design of the power supply are given.

test result

By testing the special oscilloscope produced by LeCroy company, the main test results of the power supply are as follows:

Po = 290.402W; no load power consumption is less than 1.48W; linear adjustment rate is less than or equal to 0.97%; load regulation rate is less than or equal to 1.74%; ripple is less than 0.95%; efficiency is more than 86.1%.

Conclusion

According to the above theory, a new generation of TOPSwitch controlled high-power switching power supply has been successfully designed. It not only proves the correctness of the design method, but also makes the design of the whole circuit simple and the reliability of the power supply has been greatly improved. With the further research of TOPSwitch, the high-power switching power supply controlled by the new generation of TOPSwitch will be more widely applied.