2.画出一个带有硅稳压二极管稳压电路的桥式整流电路并简述稳压原理 直流稳压电源 （画出完整的电路图并写出总结报告）
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LM317\u5176\u7279\u6027\u53c2\u6570\uff1a
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1\uff09\u786e\u5b9a\u526f\u8fb9\u7535\u538bU2:
\u6839\u636e\u6027\u80fd\u6307\u6807\u8981\u6c42\uff1aUomin=3V Uomax=9V
\u53c8 \u2235 Ui-Uomax\u2265(Ui-Uo)min Ui-Uoin\u2264(Ui-Uo)max
\u5176\u4e2d\uff1a\uff08Ui-Uoin\uff09min=3V\uff0c(Ui-Uo)max=40V
\u2234 12V\u2264Ui\u226443V
\u6b64\u8303\u56f4\u4e2d\u53ef\u4efb\u9009 \uff1aUi=23V=Uo1
\u6839\u636e Uo1=(1.1\uff5e1.2)U2
\u53ef\u5f97\u53d8\u538b\u7684\u526f\u8fb9\u7535\u538b\uff1aU2 =20V\u3002
2\uff09\u786e\u5b9a\u53d8\u538b\u5668\u526f\u8fb9\u7535\u6d41I2
\u2235 Io1=Io
\u53c8\u526f\u8fb9\u7535\u6d41I2=(1.5\uff5e2)IO1 \u53d6IO=IOmax=800mA
\u5219I2=1.5\uff0a0.8A=1.2A
3\uff09\u9009\u62e9\u53d8\u538b\u5668\u7684\u529f\u7387
\u53d8\u538b\u5668\u7684\u8f93\u51fa\u529f\u7387\uff1aPo>I2U2=14.4W
\uff083\uff09\u9009\u62e9\u6574\u6d41\u7535\u8def\u4e2d\u7684\u4e8c\u6781\u7ba1
\u2235 \u53d8\u538b\u5668\u7684\u526f\u8fb9\u7535\u538bU2=20V
\u2234 \u6865\u5f0f\u6574\u6d41\u7535\u8def\u4e2d\u7684\u4e8c\u6781\u7ba1\u627f\u53d7\u7684\u6700\u9ad8\u53cd\u5411\u7535\u538b\u4e3a\uff1a
\u6865\u5f0f\u6574\u6d41\u7535\u8def\u4e2d\u4e8c\u6781\u7ba1\u627f\u53d7\u7684\u6700\u9ad8\u5e73\u5747\u7535\u6d41\u4e3a\uff1a
\u67e5\u624b\u518c\u9009\u6574\u6d41\u4e8c\u6781\u7ba1IN4007\uff0c\u5176\u53c2\u6570\u4e3a\uff1a\u53cd\u5411\u51fb\u7a7f\u7535\u538bUBR=1000V>17V
\u6700\u5927\u6574\u6d41\u7535\u6d41IF=1A>0.4A
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\u6ee4\u6ce2\u7535\u5bb9\u7684\u5927\u5c0f\u53ef\u7528\u5f0f \u6c42\u5f97\u3002
1\uff09\u6c42\u0394Ui:
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\u8bbe\u8ba1\u8981\u6c42\u0394Uo\u226415mV \uff0cSV\u22640.003
Uo=+3V\uff5e+9V
Ui=20V
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2\uff09\u6ee4\u6ce2\u7535\u5bb9C
\u8bbe\u5b9aIo=Iomax=0.8A\uff0ct=0.01S
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\u4e09\u3001\u6ce8\u610f\u4e8b\u9879
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2\uff0e\u6d4b\u8bd5\u7535\u8def\u65f6\uff0c\u5fc5\u987b\u8981\u4fdd\u8bc1\u710a\u63a5\u6b63\u786e\uff0c\u624d\u80fd\u6253\u5f00\u7535\u6e90\uff0c\u4ee5\u9632\u5143\u5668\u4ef6\u70e7\u574f\u3002
3\uff0e\u6ce8\u610fLM317\u82af\u7247\u7684\u8f93\u5165\u8f93\u51fa\u7ba1\u811a\u548c\u6865\u5f0f\u6574\u6d41\u7535\u8def\u4e2d\u4e8c\u6781\u7ba1\u7684\u6781\u6027\uff0c\u4e0d\u5e94\u53cd\u63a5\u3002
4. \u6309\u7167\u539f\u7406\u56fe\u710a\u63a5\u65f6\u5fc5\u987b\u8981\u4fdd\u8bc1\u53ef\u9760\u63a5\u5730\u3002
5. \u7531\u4e8eLM317\u82af\u7247\u5185\u90e8\u8fd8\u662f\u7ebf\u6027\u7a33\u538b\uff0c\u56e0\u6b64\u529f\u8017\u6bd4\u8f83\u5927\u3002\u5f53\u8f93\u5165\u8f93\u5165\u7535\u538b\u5dee\u6bd4\u8f83\u5927\u4e14\u8f93\u51fa\u7535\u6d41\u4e5f\u6bd4\u8f83\u5927\u65f6\uff0c\u6ce8\u610f317\u7684\u529f\u8017\u4e0d\u8981\u8fc7\u5927\u3002
\u56db\u3001\u53c2\u8003\u8d44\u6599\uff1a
\u300a\u7535\u5b50\u6280\u672f\u52a8\u624b\u5b9e\u8df5\u300b \u4e3b\u7f16\uff1a\u50ac\u745e\u96ea \u5f20\u589e\u826f \u5317\u4eac\u822a\u7a7a\u5927\u5b66\u51fa\u7248\u793e
原理简述：
设稳压电路输出直流12V,选用稳压二极管稳压值为12V。电路图如下图所示：
当直流电源输出电压高于12V时→二极管反向击穿→输出电压下降；低于12V时→稳压二极管截止→输出电压升高；如此循环反复，从而保证输出直流电压稳定在12V左右。
稳压二极管稳压范围和功率以及电流小，不能调节输出电压值。一般用作固定稳压值电路使用，如需要求比较高的稳压电路，可选用三端稳压集成电路。
假设稳压二极管稳压值为12V！当电源电压高于12V时二极管反向击穿（相当于短路）电压下降。击穿后电压下降，低于12V恢复正常！所以稳压二极管稳压范围不是太大，功率也不高，一般最大只有1W！功率要求过大最好选用三端稳压！
绛旓細鍘熺悊绠杩帮細璁剧ǔ鍘嬬數璺緭鍑虹洿娴12V,閫夌敤绋冲帇浜屾瀬绠＄ǔ鍘嬪间负12V銆傜數璺浘濡備笅鍥炬墍绀猴細褰撶洿娴佺數婧愯緭鍑虹數鍘嬮珮浜12V鏃垛啋浜屾瀬绠″弽鍚戝嚮绌库啋杈撳嚭鐢靛帇涓嬮檷锛涗綆浜12V鏃垛啋绋冲帇浜屾瀬绠℃埅姝⑩啋杈撳嚭鐢靛帇鍗囬珮锛涘姝ゅ惊鐜弽澶嶏紝浠庤屼繚璇佽緭鍑虹洿娴佺數鍘嬬ǔ瀹氬湪12V宸﹀彸銆傜ǔ鍘嬩簩鏋佺绋冲帇鑼冨洿鍜屽姛鐜囦互鍙婄數娴佸皬锛屼笉鑳借皟鑺傝緭鍑虹數鍘嬪笺備竴鑸敤浣...
绛旓細蹇界暐鐢靛鍜孶0澶勭數闃
绛旓細鍥綼鏄12.6V 鍥綽鏄7V 鍥綾鏄1.4V
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