【产品】40V/1A降压型开关电源转换器，满载输出时壳温仅48.1℃，专为家电和照明等系统设计

时间： 2022-05-08 来源：必易微

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随着消费者生活品质的提升，联网远程操控让带着“科技感”光环的智能家电产品成为新一代“网红”。与此同时，在“碳达峰”、“碳中和”理念引领下，伴随着物联网科技的升级，对智能家居家电产品的能效提出了更高的要求。传统低压差线性稳压器（LDO）供电方案逐渐满足不了市场需求。高效率、高可靠性、低EMI的简单易用型开关电源转换器（Buck）逐渐走进家电和照明市场。

得益于比LDO更高的转换效率和负载能力，TXX5405系列广泛应用于冰箱，洗衣机和空调等大家电产品中。典型应用电路如图1所示。必易微（KIWI）深耕于电源管理芯片，愿与广大工程师一起助力科技升级。必易微最新推出用于家电和照明等系统的40V/1A降压型开关电源转换器（Buck）系列产品：KP521405固定5V输出，KP521403固定3.3V输出，典型应用电路如图2所示。

必易微VS国际大厂

必易微VS国内友商

必易微与国内友商产品测试数据和波形对比：

1．效率及热特性

在采用DCR为230mΩ的电感下，必易微方案整机仍然有优异的效率表现。常温下测试，12V输入转5V输出，最高效率达到94.5%，满载输出时产品壳温仅48.1℃。国内友商产品效率整体比较低，尤其是在轻载条件下。

2．输入过压保护

必易微产品具有输入过压保护功能，当输入电压瞬时超过安全阈值时将触发保护，使得产品抗电压尖峰能力更强，可靠性更高。

3. 更优异的Jitter性能

必易微产品具有优秀的噪声抑制能力，Jitter表现优异，输出电压纹波更低。

同步降压转换器之所以比异步降压转换器具有更高的效率是因为作为续流作用的下管导通压降比续流二极管小，所以主功率管与同步功率管的开关时序需要精确控制，否则可能造成可靠性问题和效率的损失。

4．优秀的EMI特性

必易微产品低开关速率设计让EMI更轻松。Demo板辐射通过EN55032 Class B标准且裕量充足。

综上所述，必易微方案与国际大厂相比，产品输入电压宽、外围精简，EMI性能好，可单面板布线；与国内友商相比，支持电流更大，效率更高，稳定性更强。

系列产品选型表

系列产品封装管脚图

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本文由carat转载自必易微，原文标题为:超精简40V转5V/3.3V Buck电源方案，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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JW JOULWATT （杰华特） DC-DC/AC-DC/线性电源/电池管理/LED照明/汽车电子产品选型指南

描述- 杰华特微电子成立于2013年，是一家快速成长的高性能模拟和数模混合半导体供应商。公司采用自有的先进工艺技术进行芯片设计和制造。公司拥有广泛的产品组合，涵盖DC/DC、AC/DC、线性电源、电池管理、信号链、显示、汽车电子等，应用范围涉及计算机、通讯、工业控制、服务器与数据中心、汽车电子、家用电器、消费类电子、照明等众多领域。

型号- JW1532N5,JW3663,JW3665,JWB19677BC,JW1123,JW1969D1,JW1120,JW19989A,JW19989B,JW5520S,JW1360,JW19989C,JW19976C,JW19988D,JW19988E,JWM9103A,JW15158I,JW16097,JW16098,JWH5123CH,JW15158D,JWQ7821,JW1125,JW7903,JW1969DC,JW5291PF,JW19976M,JW7806-2.85,JW7902,JW15158K,JW19975S,JWS22750,JW3651,JW1609E,JW5711,JW5710,JW3412,JW1969C1,JW15158B,JW19818CT,JW7111SA,JW5168BS,JW1532M5,JW19976A,JW19988B,JW19976B,JW19988C,JWH3515,JWQ7830,JWS29021,JW19975B,JW19975C,JW19987D,JW19987E,JWH3516,JW5712,JW5715,JW7806-2.75,JW5219P,JW19975M,JW5717,JW19975N,JW5716,JW3311-XXX,JW7921,JW1969C,JW1969A,JW7920,JW1386,JWH3530,JW4005H,JW19967A,JW19967B,JW19967C,JW15156E,JW15156F,JW5305F,JW7726H,JW5062TF,JW7823A,JWQ7843,JW15156D,JW1969O,JW1813B,JWS29001TA,JW5357HFM,JWS29001TB,JWB19673B,JWB19673A,JW5306F,JW19989E,JWQ7853,JWS29001,JWS29002,JW1969EC,JW3319,JW1160,JW7809-3.0,JW5523,JW1519B,JW1164,JW19957B,JW18226,JWQ5103CS,JW1822O,JW3313S-XXX,JW7115SA-1,JW3330,JWH7160A,JW5092H,JW7115SA-2,JW5092A,JW3332,JW5510,JW5513,JWH7924,JWH7917,JW16066,JWH7915,JWQ5103BS,JW19967M,JW7809-3.3,JWM9203FCL,JW7809-3.2,JW7809-3.1,JW196738C,JW196738D,JW3362,JW1180O,JW7809-2.85,JWM9123EC,JW1180E,JWH5513,JW3360,JW16033,JW1832O,JWQ5103AS,JW1965O,JW5292PF,JW5306,JW5305,JWQ7806,JWQ7924,JW1965BC,JWQ7809,JW1832D,JWQM93902,JWM9102,JW7830,JW5357HF,JW5535,JW7952,JWH7821,JW5169BS,JWM9220,JWH7823,JWH7822,JW18222,JW18221,JW3312-XXX,JWH7821A,JW1967EH,JWQ5513,JW1965AC,JW1518L,JW7809-4.0,JW1536NC,JW7809-4.5,JW5262CFM,JW5357HM,JWB19819,JWH7030,JWB19816,JW1539A,JW7726HAEC,JW5188CU,JW1882,JW19925A,JW5363HF,JW19925B,JW19925C,JW19876,JWB1981L,JW5711A,JW12558C,JW1539O,JW12558D,JW3701,JW3702,JW33708,JW12558A,JW3703,JW1965DC,JW1999A,JW1830D,JW1999B,JW5352HM,JW1964B,JW7115S-1,JW7115S-2,JWH5103AS,JWH6346A,JW1516A,JW5188DU,JW5352HF,JW19948E,JW3317-XXX,JW1516,JW5712A,JWH7160,JW1831D,JW1964D,JW5188DH,JW1964C,JW5361FM,JW1513A,JW5291F,JWH7295,JWH7294,JW5362HF,JW5186AU,JW19818C,JW5291P,JWB19818J,JWB19818L,JW5262CM,JW5701G,JW5701F,JW19853,JW5701E,JWQ3760,JW5701B,JW5262CF,JW5701A,JWH71522L,JW5186AH,JWH71522H,JWH7291,JWH7290,JW1965FC,JWQ6346A,JW4056A,JW1520AH,JW1538B,JWH7069,JW3360-XXX,JW5292F,JWH7067,JW5292P,JWH5123S,JW1530,JWB1992A,JWH5123P,JWH6344A,JWB1992B,JW1532BL,JW1962O,JW5062T,JWM9215AEC,JWB1992M,JW19925M,JW12557C,JW19925N,JW1962H,JW1962G,JWB1992N,JW5018XF,JWH7060,JW1965EC,JW1538NC,JWB1992S,JW7807-1,JW5293P,JWB1698D,JW1532AL,JW18066M,JW5061TC,JW19819L,JW5061TF,JWH5125CH,JW5703C,JW19836,JWS24285,JW1962BH,JWH5102C,JW5052C,JWH5102B,JW7726AD,JW5040C,JWH5102A,JW7726AC,JW3318-XXX,JWQ52992,JWQ52993,JW5173S,JWH5125S,JW1550,JW19928E,JW4054A,JW19818J,JW19818L,JW7726BL,JW1556,JW1962AH,JW12555B,JW77218B,JW77218C,JW7726BH,JW16638F,JWH5125C,JW19818T,JW5186A,JW16638D,JW5392H,JW5188AH,JWH5103BS,JW3760,JW5392F,JW1532Y,JW7111S,JW5188AU,JW12552B,JW19813,JW5066F,JW19818,JW5393C,JW1962DG,JW19819,JW1994A,JWH5103CS,JW1994B,JW1994C,JW5393F,JW1994D,JW5393H,JW3510,JW1572,JW1571,JW3410-XXX,JW3319-XXX,JW1994M,JW5520SA,JW5079A,JWB1536AC,JW18287E,JW18287D,JW19828,JW18287C,JW18287B,JWS24157,JW18287A,JW5188A,JW16979C,JW5079C,JW7222,JW7228,JW1996EG,JWM368H,JW5394F,JW7106,JW5031S,JW3412-XXX,JW9520,JWQ5103CSF,JW5040,JW7221,JW1531M,JW7806-4.5,JW5068A,JW5262C,JW18288E,JW5250A,JW5056F,JW18288D,JW7109,JW7807-2.8,JW18288C,JW7807-2.9,JW18288B,JW5068C,JW1962FG,JW1531B,JW7807-2.7,JW7807-2.5,JW7807-2.2,JWH5140,JW5262M,JW7211,JW5262L,JW7807-2.1,JW5371F,JW7221L,JWH5141,JW5250S,JW5393,JW5262N,JW5392,JW7806-4.0,JW1531O,JW5394,JW5069A,JW1568K,JW5059TC,JW1515HA,JW1520D,JWB18226,JW5069C,JW1962EG,JW1532B,JW5059TF,JW5057C,JW1556B,JW5033C,JW1556C,JW1532A,JWH5140F,JW5066,JW7124,JW7808-2.75,JWH5276,JW5372F,JWH5155,JW3362-XXX,JWM9106EC,JWH5156,JWM9203CL,JW5057S,JW5142P,JW7122,JW5065,JW1565J,JW7807-1.8,JW7807-1.5,JW5056,JWH5280,JW5361M,JW7112,JW7808-2.85,JW7113,JW7807-1.2,JWM367H,JWH6375,JW7118,JW5361F,JWH5042,JW5361H,JWH6374,JW15307,JW5292,JWH5046,JW5291,JWH7103,JW5058S,JW5393HF,JW5143P,JW7806-3.0,JW5293,JW7806-3.1,JWQ7065,JW7806-3.2,JW7806-3.3,JWQ71910,JWB1981S2,JWB1981S3,JWB1981S4,JWS29001CA,JWS29001CB,JWB1981S5,JWB1981S6,JW1566A,JW1962GG,JW16608F,JW1816,JW1962JG,JW1536AC,JW5362H,JWB1997A,JW5352HFM,JW5361HM,JWH7232,JW16066B,JW5393CF,JW16066C,JW7260,JW5361HF,JW19673C,JW5186CU,JW15329B,JW15329A,JW7265,JW7806-2.5,JWB1997M,JWQ5125A,JWB1997N,JWH71524H,JW7806-2.7,JW7806-2.8,JW1602,JW7806-2.9,JW1660B,JWB1997S,JW5363F,JW1609,JW1236A,JW5018YF,JW3902,JW1236B,JW3903,JWH71524L,JW1606,JW1962IG,JWH7241,JWM367,JWH5141F,JW1996HG,JWM368,JWM369,JW16803O,JW5363H,JWH6396,JW5070,JW5186DU,JW5071,JW15328A,JW7806-2.2,JW15158AS,JW15328B,JWQ5102A,JW5255A,JW7105B,JW5186DH,JWM362,JW5352M,JW7228P,JW5352H,JW7107S,JW7700A8,JW1681O,JW18222S,JWB1995B,JWQ29021,JWQ5102C,JWQ5102B,JW7806-1.8,JW7806-1.9,JW1985,JW1149H,JW3655E,JW1807BH,JWH5084,JW1962KG,JWH5083,JWS22251,JW5092,JW15326B,JW19698F,JW19698E,JW5093,JWQ5102CSF,JW7806-1.2,JW19698C,JWB1995SB,JW7806-1.5,JW5015A,JW1332C,JW1332B,JW5100A,JW5100B,JW1332A,JW1807CH,JWQM93902A,JW7809-1.2,JW19818JT,JWQM93902F,JWH5103CSF,JW1518HCD,JW1255O,JWQ5123

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描述- SGMICRO specializes in high-performance and high-quality analog and mixed-signal integrated circuits, and is committed to building a comprehensive portfolio of the highest quality analog and mixed-signal integrated circuits to address all customer needs.

型号- SGM11108M,SGM8306-2,SGM8306-1,SGM61450,SGM3733B,SGM11108E,SGM852,SGM853,SGM851,SGM5347-12,SGM2558A,SGM2558B,SGM8261-5,SGM2564,SGM8261-1,SGM5347-10,SGM8261-2,SGM2549,SGM48017C,SGM72110,SGM8094,SGM836,SGM8091,SGM837,SGM61220,SGM8092,SGM8093,SGM835,SGM72108,SGM2553,SGM72106,SGM2555,SGM809B,SGM4519,SGM4517,SGM4518,SGM48010,SGM11106C,SGM63600,SGM41611,SGM4520,SGM4521,SGM48005,SGM8417-4,SGM8417-2,SGM4051C,SGM48000,SGM48001,SGM48002,SGM3843A,SGM61433,SGM621,SGM84782,74HC574,SGM58031,SGM620,SGM862,SGM41600,SGM2572,SGM41603,SGM860,SGM2571,SGM51622H,SGM4995,SGM4511,SGM2574,SGM4996,SGM4512,SGM4510,SGM2575,SGM51622D,SGM4515,SGM8T245S,SGM4516,SGM8250-1,SGM8250-2,SGM4514,SGM3209,SGM809,SGM8557-3,SGM8557-1,SGM8557-2,SGM803,SGM61012,SGM804,SGM802,SGM61013,SGM810,SGM811,SGM61007,SGM61006,SGM4782,SGM7237B,SGM8902,SGM8903,SGM8904,SGM4542,SGM8905,SGM4548,SGM4549,SGM3699,SGM4546,SGM4547,SGM48013C,SGM62110,SGM61020,SGM62112,AAP6153A,SGM61022,SGM62111,SGM800,SGM2596,SGM3200,SGM3206,SGM8270-2,SGM3207,SGM4535,SGM3204,SGM8270-4,SGM8T245,SGM829,SGM61230,SGM42512,SGM41664,SGM825,SGM61232,SGM823,SGM61234,SGM824,SGM891B,SGM42507,SGM42506,SGM40567,SGM4560,SGM42505,SGM4561,SGM6503,SGM4566,SGM8925,SGM6502,SGM8926,SGM6501,SGM4564,SGM8927,SGM5349-16,SGM4565,SGM6505,SGM4568,SGM6504,SGM8909,SGM818,SGM890B,SGM816,SGM42501,SGM40565,SGM42500,SGM814,SGM815,SGM812,SGM40560,SGM40561,SGM821,SGM822,SGM61235,SGM820,SGM4551,SGM4552,SGM4550,SGM4555,SGM4556,SGM4553,SGM4554,SGM51652S8,SGM8910,SGM5347-8,SGM4558,SGM11124E,SGM37863A,SGM11124F,74LVC2T45,SGM893B,SGM4581,SGM8941,SGM4582,SGM4583,SGM48521Q,SGM8704,SGM4588,SGMNQ59430,SGM8705,SGM4589,SGM8706,SGM8707,SGM8942,SGM8701,SGM8702,SGM8703,SGM12213A,SGM11210A,SGM61060,SGM2050C,SGM12UB1D2,SGM892B,SGM8276-4,SGM6510,SGM4573,SGM3001,SGM4574,SGM42513,SGM6514,SGM3005,SGM6513,SGM4578,SGM8276-2,SGM3002,SGM6512,SGM42622B,SGM8276-1,SGM3003,SGM6511,SGM4576,SGM8931,SGMOP17C,SGM8932,SGM8933,SGM6516,SGM12214A,SGM8934,SGM6515,SGM11210M,SGMNE20220,74AVC8T245,SGM3141B,SGM61030,SGM42403Q,SGM42553,SGM61032,SGM61031,74HC165,SGM62116,SGM8953-1,SGM62118,SGM8953-2,SGM62117,SGM8708,SGM8709,SGM4075-2,SGM3140B,SGM61040,SGM4075-1,SGM42544,SGM7300A,SGM7300B,SGM42541,SGM42540,SGM8951,SGM8952,SGM8710,SGM4590,SGM5200,SGM38045,SGM38042,SGM6533,SGM8711,SGM8712,SGM8955,SGM38046,SGM8956,SGM2053S,SGM8199L2,LM2904,SGM8199L1,SGM41002,SGM8968-4,SGM8968-2,LM2902,SGM8968-1,SGM8740,SGM8741,SGM8742,SGM2077A,SGM8743,SGM2077B,SGM8263-1,SGM8748,SGM8263-2,SGM8417-1,SGM8749,SGM12CB1A5,SGM8744,SGM40666B,SGM8745,SGM11104S,SGM40666A,SGM8746,SGM8747,SGM41513D,SGM41513A,SGM42561,SGM42560,SGM8957-1,SGM8957-2,SGM42562,SGM5208-14,SGM5223,SGM48018C,SGM11102F,SGM11102G,SGM41512A,SGM37603A,SGM8521,SGM8522,SGM11102S,SGM33685A,SGM5018,SGM33685B,SGM33685C,SGM8524,SGM8604-1,SGM11103E,SGM8604-5,SGM8193A3,SGM11103F,SGM8604-2,SGM8193A2,SGM48019C,SGM8604-3,SGM8193A1,SGM8193A0,SGM37604A,SGM8751,SGM11103S,SGM41007,SGM41008,SGM6332,SGM8750,FT2830P,SGM11212M,SGM41280,SGM41281,SGM41283,SGM5353-16,SGM37891A,SGM41285,SGM41286,SGM7SZ244S,SGM8542,SGM51652H8,SGM8543,SGM8301,SGM8544,SGM8302,SGM8545,SGM51652H4,SGM8541,SGM8429C-4,SGM8304,SGM8607-2,SGM37892A,SGM13003A,SGM8531,SGM8773,SGM8532,SGM8534,SGM8770,SGM8771,SGM8772,SGM8535,SGM8536,SGM8537,SGM12024A,SGM8538,SGM65230,SGM37893A,SGM65231,SGM65232,SGM8969-2,SGM8969-1,SGM13002A,SGM2035C,SGM7232,SGM9128YP,SGM41291,SGM2036S,74LVC1G32Q,SGM13001C,SGM13001B,74LVC138,SGM2581E,SGM8958-2,SGM41295,SGM13001A,SGM8958-1,SGM7222,SGM6132,SGM8554,SGM7223,SGM8555,SGM7224,SGM6130,SGM8556,SGM2581C,SGM8551,SGM7220,SGM2581A,SGM8552,SGM7226,SGM7227,SGM7228,SGM7229,SGM44599,SGM8581,SGM8713A-1,SGM8582,SGM6613A,SGM8584,SGM832B,SGM41282C,SGM832A,SGM8714B-1,SGM8924A,SGM811C,SGM5355-16,SGM7SZ19,74LVC1G125,SGM48535B,SGM89000,SGM7SZ14,SGM811B,SGM48535A,SGM48752X,SGM431VB,SGM2560A,SGM37603,SGM2560B,SGM6611C,SGM15CB1A4,SGM810B,SGM41280A,SGM8591,SGM8592,SGM48753X,SGM9203,SGM6612A,SGM8594,SGM8922A,SGM4T245,SGM48753,SGM48754,SGM48755,SGM48756,SGM51242R8,SGM48757,SCM40668,SGM813B,SGM48759,74AVC4T245,SGM8140,SGM8141,SGM48751,SGM449,SGM48752,SGMNQ07430,SGMPM21330,SGM48510,SGM458,SGM3785S,SGM37864,SGM61720,SGM459,SGM37863,SGM457,SGM8142,SGM452,SGM450,SGM451,SGM05UB1B3,SGM37862,SGM37861,SGM05CB1A8,SGM05CB1A7,SGM812B,SGM05CB1A4,74GTL2005,SGM25881,SGM447,SGM448,SGM446,SGM7SZ244,SGM8478-1C,SGM51242R4,SGM8139,SGM51242R2,SGM3705,SGM48536,SGM48537,SGM48538,SGM48539,SGM5351-16,SGM2588G,SGM2588E,SGM2588K,SGM3712,SGM3713,SGM2588C,SGM3710,SGM3711,SGM2588A,SGM48522,SGM48523,SGM48525,SGM48526,SGM48760,SGMNQ07440,SGM48520,SGM48521,SGM8557-5,SGM71XX,SGM706B,SGM460,SGM3701,SGM3700,SGM3727,SGM3741B,SGM3725,SGM3726,SGMOP07,SGM898,SGM899,SGM896,SGM897,SGM895,SGM4823,SGM2566B,SGM3735,SGM3732,SGM4822,SGM2566A,SGM3716,SGM3740B,SGM48544,SGM4806,SGM3717,SGM48545,SGM3714,SGM3715,SGM4809,SGM4807,SGM3718,SGM4808,SGM3719,74LVC157,SGM48780,SGM48540,SGM48541,SGM48542,SGM48543,SGM37898,SGM51652H,SGM51652D,SGM3720,SGM37891,SGM4812,SGM37892,SGM4810,SGM37895,SGM3749,SGM3747,SGM3748,SGM72204A,SGMNQ40430,SGM

2024/6/11 - SGMICRO - 选型指南代理服务技术支持现货查询批量订货

必易微提供高性能、高可靠性的一站式芯片解决方案，应用在智能家电、工业电源、新能源领域

必易微系统应用总监文鹏先生在第20届中国家电用集成电路技术交流会上，受邀发表了题为《家电低待机辅助电源技术》的主题演讲。必易微深耕电源管理多年，凭借深厚的技术积累和一系列富有特色的创新方案，在智能家电、工业电源、新能源等辅助电源提供高性能、高可靠性的一站式芯片解决方案，展现出了独特的竞争优势。

2024-11-26 - 原厂动态代理服务技术支持现货查询批量订货

必易微（KIWI）IOT领域电源管理芯片产品介绍

型号- KP2190,KP311AWPA,KP20H,KP3281DP,KP2191,KP4110-1-2,KP2192,KP212,KP86888,KP3116WPA,KP2501,KP86884,KP206A,KP216,KP3210BSGA,KP206B,KP214,KP3224DP,KP3205SGA,KP3310,KP3126SG,KP23111,KP2182,KP23110,KP101,KP201E-H,KP15026VPA,KP86888S,KP3110-2-4-6,KP201A-H,KP3116SGA,KP22306,KP322XDP,KP216X,KP15012SPA,KP23132M,KM8684NQ,KP3221DP,KP3282DP,KP15026,KP3310DPA,KP3210-1-2B,KP3211BDP,KP2201-B,KP2326,KM868X,KP1513,KP3114WPA,KP146X,KP2164,KP206A-B,KP2162,KP2202,KP3120SPA,KP2161,KP201,KP18026,KP15026WPA,KP3112LGA,KP214X,KP2182X,KP206,KP3114SGA,KM8688NQ,KP4055,KM8684NS,KP3126,KP226X,KP2061-4,KP23266,KP15014SPA,KP23264,KP4051,KP201-E-F,KP1511X,KP3210SGA,KP322X,KP201X,KP321ABSGA,KP3110,KP3222DP,KP1452,KP3221SG,KP4124X,KP2313X,KP201H,KP23133M,KP201F,KP18051ESPA,KP41242,KP3211BSGA,KP41240,KP41241,KP23152,KP15012-4,KP3210BDP,KP23151,KP201A,KP23150,KP1512X,KP201E,KP201B,KP201C,KP212X,KP36673-4,KP35015,KP3221SGA,KP2010,KP2131,KP3310SPA,KP3112SGA,KP2011,KP2132,KP2130,KP2012,KP2013,KP3284DP,KP3126SGA,KP18061ESPA,KP1315X,KP3110SPA,KP2126,KP4050-A,KP18055ESPA,KP2801,KP142X,KP1030,KP2120,KP2124,KP328X,KP2122,KP311ALGA,KP23133,KP18069,KP23132,KP3212BDP,KP226XH,KP41240-1-2,KP141X,KP401,KP2591,KP21821-2-4,KP206X

2020-07 - 必易微 - 商品及供应商介绍代理服务技术支持现货查询批量订货

【产品】高集成度、高效率的Buck LED功率开关KP1054XVP，采用SOP-4封装

必易微电子的KP1054XVP系列是高度集成的功率开关，带有准谐振降压（QR-Buck）恒流（CC）控制芯片，适用于LED照明应用。KP1054XVP在单个芯片中集成了500V功率MOSFET，600V 超快恢复二极管和功率控制器。该IC还集成了无需VDD电容的高压LDO电源电路，以及无需辅助绕组的变压器消磁电路。芯片采用准谐振控制模式，从而实现高效率。