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极速赛车走势图|极速赛车开奖直播|极速赛车开奖结果|极速赛车投注ॱ | keneipc.com Reviews
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鑲嚎鐢靛瓙涓撲笟鐢熶骇宸ヤ笟鐢垫簮,鏄笓涓氱殑宸ヤ笟鐢垫簮鐢熶骇鍘傚,鐜板悜鍏ㄥ浗璇氭嫑浠g悊鍔犵洘鍟?鐢佃瘽:0755-83236965 浼犵湡锛?755-83014669
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发布者 keneipc 发布时间 2015/1/20 阅读 669. 光电耦合器件存在的问题是 耗费输出功率 成本增加,电路结构便得复杂 有限的动态响应、器件非线性、老化等,都会带来麻烦。 其中 VF 变压器二次侧 整流. D2正向压降 ISEC 变压器二次侧电流 ESR 二次回路的总阻抗 NPS 变压器有效的原副边匝数比 VOUT 输出电压。 该电感值计算公式如下 式中 toff(MIN)=350ns,开关管最小关断时间 IMIN=250mA,转换器的最低电流限制。 其中 开关管Q1的Ic/Ie比值,典型值为0.986 VTC 0.55V VBG 内部带隙基准电压。 版权2014Keneipc.comAllRightsReserved.深圳市肯亿电子技术有限公司电话:0755-83236965传真 0755-83014669展柜地址 广东省深圳市福田区华强北都会电子市场3B118工厂地址 中国广东省东莞市万江区莫屋骏利工业园1-2整层.
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版权2014Keneipc.comAllRightsReserved.深圳市肯亿电子技术有限公司电话:0755-83236965传真 0755-83014669展柜地址 广东省深圳市福田区华强北都会电子市场3B118工厂地址 中国广东省东莞市万江区莫屋骏利工业园1-2整层.
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版权2014Keneipc.comAllRightsReserved.深圳市肯亿电子技术有限公司电话:0755-83236965传真 0755-83014669展柜地址 广东省深圳市福田区华强北都会电子市场3B118工厂地址 中国广东省东莞市万江区莫屋骏利工业园1-2整层.
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版权2014Keneipc.comAllRightsReserved.深圳市肯亿电子技术有限公司电话:0755-83236965传真 0755-83014669展柜地址 广东省深圳市福田区华强北都会电子市场3B118工厂地址 中国广东省东莞市万江区莫屋骏利工业园1-2整层.
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发布者 keneipc 发布时间 2014/8/28 阅读 779. 被动式PFC的功率因数只能达到0.7 0.8,一般在高压滤波电容附近。 假如现在有一台发电机,它最大能输出120VAC,15A的电流,即它的输出功率最大是120 15=1800W, 现在如果有一台PF(power factor)很低的电源接到发电机上, 该电源的效率是98%,PF是55%, 那么该电源的输出端能提供的最大功率是: 1800 0.98 0.55=970W, 如果PF提高到99%, 电源的输出端能提供的最大功率就会提升到: 1800 0.98 0.99=1746W。 这样,对于同一个电源输出功率, 高的PF电源,对发电机的容量要求就会降低; 同样,对于同一个发电机,它用有限的功率,能同时供电给更多的电源; 这样,由于往返发电机与电源之间电线上的谐波电流造成的损耗也相应会减少。 举例来说, 原来的PF值为0.6,通过PFC提高到0.95,则变电站的变压器容量可以降低近1/3!
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