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电磁炉开机不加热 好吗

2017-12-28 14页 doc 41KB 8阅读

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电磁炉开机不加热 好吗电磁炉开机不加热 好吗 答:电磁炉开机不加热故障首先要检查三个基本电压是否正常:300V(这里指拆提线盘后,线盘座子处的电压,如果此电压过低说明电容(5UF或4UF)不良或同步电路取样大功率电路不良)、18V(驱动电压,至LM339的第3脚)、5V(至CPU和线盘传感器)。先查高压电阻,有变值的就换。不行查驱动管,两个高压电容,检测电阻(240K~900K):有两路的检测电路.一个是从线圈出来的检测电路,一路是从220来的电压检测电路.。 IGBT的G极如果不是0V 换339;0.33uf的容量一较少则必须换掉。上电延时电路...
电磁炉开机不加热 好吗
电磁炉开机不加热 好吗 答:电磁炉开机不加热故障首先要检查三个基本电压是否正常:300V(这里指拆提线盘后,线盘座子处的电压,如果此电压过低说明电容(5UF或4UF)不良或同步电路取样大功率电路不良)、18V(驱动电压,至LM339的第3脚)、5V(至CPU和线盘传感器)。先查高压电阻,有变值的就换。不行查驱动管,两个高压电容,电阻(240K~900K):有两路的检测电路.一个是从线圈出来的检测电路,一路是从220来的电压检测电路.。 IGBT的G极如果不是0V 换339;0.33uf的容量一较少则必须换掉。上电延时电路发现三极管Q6(8550)E发射极与C集电极击穿损坏。再不行就换339.IGBT 电磁炉通电不加热 满意回答 若灯泡暗红,开启电磁炉电源,灯泡一亮一暗地闪烁,但把锅具抬起灯泡很亮;属于抬锅炸IGBT,应检查CPU 驱动 线盘 大多数是线圈损坏。以 美的 机为例:稳压二极管ZD1(18V)开路损坏,会造成出现整机低压供电电路对地电压升高;稳压二极管ZD1(18V)失效损坏时(待机检测C92对地+18V电压是正常,但开机后检测C92对地+10V电压偏低。),会造成出现屡爆IGBT管故障发生。LC振荡电路元器件受损时,均会造成电磁炉上电即烧IGBT管、或上电开机检锅即烧IGBT管、及振荡频率偏高迫使IGBT管导通时间过长,而引发IGBT管击穿损坏。测LC振荡电路滤波电容器C4对地+305V电压,为正常。如果C4对地电压偏低、会造成电磁炉振荡频率变高导致IGBT管导通时间过长而烧毁IGBT管。如共振电容器C5失效。一上电或一检锅会造成IGBT管而烧毁IGBT管。LC振荡电路C5失效受损时,有时会造成电磁炉上电开机数秒钟内检锅时出现“烧毁IGBT管”故障。加热线盘绕组存在匝间短路、底部磁片出现碳化或短路损坏时,会造成电磁炉上电开机后出现爆管IGBT。IGBT管控制极G极,限幅稳压二极管Z1反向漏电时,有时会造成电磁炉出现“屡爆IGBT管。 电磁炉加热线圈与高频谐振电容器通过IGBT高频开关快速导通、截止,形成LC振荡电路。LC自由振荡的半周期时间出现峰值电压,亦是IGBT截止时间,这时开关脉冲没有到达。这个时间关系不能错位,如峰值脉冲还没有消失,而开关脉冲已提前到来,就会出现很大的导通电流,导致IGBT烧坏。因此,必须保证开关脉冲前沿与峰值脉冲后沿相同步。 三极管Q3、Q4参数失常、击穿及电阻R37变质损坏,有时会导致IGBT管击穿。二极管D20击穿、比较器(U2A)失常,上电后会导致IGBT击穿。侯森原创经验希望对大家有一点点的帮助,少走弯路,多入银两。 美的电磁炉爆损IGBT管与相关电路故障及维修-------李少怡 目前,在小家电维修界无论是专业厂家售后维修、或家电维修爱好者,凡从事电磁炉维修行业大家知道;电磁炉维修是最怕爆损IGBT 管故障。时下,每当客户送修电磁炉被确诊为爆损、屡损IGBT 管故障时,人们时常总感到惊讶~有时甚至还感到束手无策的“棘手\"活,所以很**修部就以换板,或其他理由就婉言谢绝拒修了~其实这样处置是另有原因:由于部分维修工,对电磁炉各电路缺乏基础知识的了解及研究,按步就搬进行维修,结果在维修过程中若出现屡损高额昂贵的IGBT 管。那么,不但挣不到报酬,反而还要赔老本,所以对维修屡损、爆损IGBT 管的故障就望而却步。 welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury 其实,笔者认为,维修该类故障并不难~维修前,首先应分清:是人为因素造成,还是元器件受损,或元器件存在质量问题。检修时,可借助万用表的检测宿小故障潜在范围,“对症下药”,维修电磁炉才能真正做到得心应手。 一、人为因素造成。 1. 锅具的选用。 电磁炉的锅具选用,应该严格按照厂家随机原配的锅具进行使用。厂家在设计电磁炉加热功率电路时,首先根据锅质的“磁阻”大小而定的,不同的锅具“磁阻”会决定电磁炉检锅脉冲个数也不同。如美的电磁炉锅具不锈钢(304)“磁阻”,比不锈铁(430)“磁阻”要大,在同等2000 W 电磁炉上,若将不锈铁(430)锅具放上进行加热是无法达到额定2000 W 功率;反之,将不锈钢(304)锅具放上进行加热,就轻而易举达到2500 W 甚至更高。所以说锅具选用不当,会导致电磁炉出现爆损IGBT 管原因之一。 2:LC振荡电路。 LC 振荡电路实际上是把电能转换成磁能,由IGBT管、加热线圈盘L 及谐振电容C5 组成高频LC 振荡回路,并通过IGBT 管高频开关导通、截止的作用,来实现控制电磁炉的加热功率。 当LC 振荡电路受损时,会致使电磁炉出现爆损IGBT 管、报警不加热及不报警不加热等故障。其维修步骤如下: 一台美的2005 年标准通板MC-SH2111 型电磁炉,取下加热线圈盘,将该电磁炉上电待机,用万用表直流电压(50 V)档红表笔(+)接在IGBT 管集电极c 上,黑表笔(-)接在整流桥负极上,将电磁炉上电,此时万用表指针快速从0 V 开始上升至+45 V 后,又回降至+0.6 V 电压,为正常。 当谐振电容C5 为(0.3 μF/1200 V)时, ( 1)谐振电容容量与电压峰值? 测IGBT管集电极c 峰值对地为+45 V 至+0.6 V 电压,正常。 ? 当谐振电容C5 为0.27 μF/1200 V 时,测IGBT 管集电极c 峰值对地为+42 V 至+0.6 V 电压,正常。 若测IGBT 管集电极c 峰值对地0 V 电压时,为谐振电容C5 失效或开路损坏及同步电压比较电路中比较器U2D(LM339)损坏,使13脚输出高电平(正常为+0.1 V)。这时,若接上加热线圈盘上电,会致使电磁炉上电时出现爆损IGBT 管故障。 (2)当测IGBT 管集电极c 峰值对地电压始终持续在+225 V 或+45 V 时,为高压供电电路中滤波电容C4(5 μF/275 V)失效或开路。这时,若接上加热线圈盘上电,会致使电磁炉上电加热时出现爆损IGBT 管、报警不加热、不报警不加热、不停地检锅及断续加热等故障。 (3)当测IGBT 管集电极c 峰值对地为+25 V 至+0.2 V 电压时(正常为+45 V 至+0.6 V),为谐振电容C5 失效或开路。这时,若接上加热线圈盘上电,会致使电磁炉上电加热时出现爆损IGBT 管、报警不加热及不报警不加热等故障。 (4)将电磁炉上电,当测IGBT 管集电极c 对地为+0.6 V 电压,正常,装上加热线圈盘测IGBT 管集电极c 对地为+305 V 电压,正常。这时,若上电开机,放锅加热,会致使电磁炉出现爆损IGBT 管故障,为加热线圈盘损坏所致。 welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury (5)将电磁炉上电,当测IGBT 管集电极c 对地为+0.6 V 电压,正常,装上加热线圈盘测IGBT 管集电极c 对地为+305 V 电压,正常。这时,若上电开机,放锅加热,会致使电磁炉出现爆损IGBT 管故障,为IGBT 管控制极c 对地分压贴片电阻R38 开路损坏所致。 (6)将电磁炉上电,当测IGBT 管集电极c 对地为+0.6 V 电压,正常,装上加热线圈盘测IGBT 管集电极c 对地为+305 V 电压,正常。这时,若上电开机,放锅加热,会致使电磁炉出现爆损IGBT 管故障,为IGBT管控制极G 限幅稳压二极管Z1 漏电所致。 同步电压比较电路。 电磁炉加热线圈L 与高频谐振电容C3 是通过IGBT 管高频开关快速导通、截止,形成LC 振荡电路。 LC **振荡的半周期时间出现峰值电压,亦是IGBT管截止时间,这时开关脉冲没有到达。这个时间关系不能错位,如峰值脉冲还没有消失,而开关脉冲已提前到来,就会出现很大的导通电流,导致IGBT 管烧坏。因此,必须保证开关脉冲前沿与峰值脉冲后沿相同步。 当同步电压比较电路受损时,会致使电磁炉在上电加热时出现爆损IGBT 管、报警不加热、不报警不加热、不停地检锅及断续加热等故障。其维修步骤如下: 一台美的MC-SF2012 型电磁炉,通常,笔者在维修电磁炉同步电压比较电路时,为了避免IGBT 管爆管,先取下加热线圈盘,因此,就造成比较电路IC2C(LM339)?脚(V+ 同相输入端)对地为0 V 电压(正常为+3.6 V),使比较电路IC2C辊輲讹脚(输出端)为低电平(正常为+18 V)。针对该故障,在IC2C(LM339)?脚(V+ 端),用普通电阻1.5 kΩ 与整机+5 V 电压端相联构成同步电压比较电路(V+ 取样电压),提供维修检测同步电压比较电路时使用,并将电磁炉上电待测。 用万用表直流电压(10 V)档测同步电压比较电路中IC2C(LM339)?脚(V- 反相输入端)对地为+3.4 V电压,正常,若该工作点电压异常,多为取样电阻R18(330 kΩ/2 W)变值或开路损坏,电容C13(2000 pF)漏电或击穿及IC2C(LM339)损坏,会致使电磁炉上电加热时出现报警不加热、不报警不加热等故障。 测IC2C(LM339)? 脚(V+ 同相输入端)对地为+3.6 V 电压,正常。若该工作点电压异常,多为取样电阻R19(240 kΩ/2 W)、R20(240 kΩ/2 W)变值或开路,电容C10(470 pF)漏电或击穿及IC2C(LM339)损坏,会致使电磁炉上电加热时出现爆损IGBT 管、报警不加热、不报警不加热、不停地检锅及断续加热等故障。 测IC2C(LM339)辊輲讹脚(输出端/OUT)对地为+18 V电压,正常。若该工作点电压异常,多为贴片电阻R39(2 kΩ)变值或开路,贴片二极管D20(1N4148)漏电或击穿,会使电磁炉上电加热时,出现报警不加热的故障。 另外,当同步电压比较电路中IC2C(LM339)V- 取样电压与V+ 取样电压相近时(正常为V-、V+ 取样电压应相差+0.2,+0.35 V),否则,会使电磁炉在上电加热时出现不定期爆损IGBT 管及断续加热等故障。 welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury 当电磁炉出现“屡损IGBT管”故障,维修时:建议将电磁炉主电路板、及控制显示灯板,用“天那水”进行去油污清洗、吹干后再修。 1、先将受损元器件更新如:保险管(12A)、整流桥(RS2006)、IGBT管(IH20T120)。 2、在电磁炉主电路板电源线L端串联接入220V/40W灯泡后,上电待机,用500型万能表相应直流电压档测高压供电电源对地为+305V电压,正常,测低压供电电源对地为+18V电压、及AN7805输出端对地为+5V电压,正常(在确保整机“三” 电压正常后再修)。 3、取下加热线圈盘,用500型万能表直流电压50V档,红表笔接在IGBT管集电极C上、黑表笔接在整流扁桥的负极上,测电磁炉上电时浪涌峰压值以鉴定电磁炉是否为正常。如以下例举: 1)美的MC-SH208型上电时,浪涌峰压值为先上升至+45V后降至+0.7V电压,为正常。 2)美的MC-SF2012型上电时,浪涌峰压值为先上升至+32V后降至+0.5V电压,为正常。 3)美的MC-SY191C型上电时,浪涌峰压值为先上升至+32V后降至+1.2V电压,为正常。 4)美的MC-CF202型上电时,浪涌峰压值为先上升至+75V后降至+1.4V电压,为正常。 5)美的MC-SY183B型上电时,浪涌峰压值为先上升至+33V后降至+0.6V电压,为正常。 6)美的MC-PSY18A型上电时,浪涌峰压值为先上升至+20V后降至+1.4V电压,为正常。若以上工作点异常,多为滤波电容器(5µF/275V)、及谐振电容器(0.27µF/1200V至0.3µF/1200V)、漏电或失效。 4、装上加热线圈盘,用500型万能表直流电压10V档,测同步比较电路取样电压V-,应小等于取样电压V+的+0.2V至+0.35V电压,为正常。 5、焊下IGBT管控制极G上的限幅稳压二极管(18V),用500型万能表10KΩ档测试是否漏电,建议更新它,否则将造成屡损、爆损IGBT管~ 6、当电磁炉的+18V低压供电电源与排风电扇电源共用一起时,必须确保排风电扇正常,否则将造成屡损、爆损IGBT管~ 7、将待修电磁炉装好,准备上电试机; 1)当上电开机放锅加热时,若灯泡一闪亮后即灭为整机已修复,方可取下灯泡直接试机~ 2)当上电开机放锅加热时,若灯泡“全亮”为“故障存在”为此,切不可取下灯泡直接试机~否则将再次出现“爆损IGBT管”故障发生,应继续查找潜在故障,可按以上维修方法继续进行。 损坏IGBT管大多因素:??——张占生 电磁炉线盘是完成LC振荡的重要器件之一,它是将电能进行储存.及释放。有电场能.转换为磁场能的关键器件。电磁炉.输出功率的大小.效率的高低和线盘有较大的关联。为此对它应有必要的进一步地了解。就这个问题我谈一下我的见解,给朋友们一点启示,供各位朋友以参考和讨论。线盘的参数主要是两个方面:(1)是电感量,(2)是Q值. 而决定这两个参数的是铜线的外径大小、股数.和绕在welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury 线盘上的圈数的多少,还有就是线盘上附加的磁条的磁通量.和磁条数量的多少。线盘无磁条时, 要想提高线盘的电感量必须增加线圈的匝数,(股数,和圈数)这样做它不仅浪费了资源和成本的提高,而且导线增长直流电阻增大也不利于输出较大的功率。为此要附加磁条来提高它的电感量。(相同匝数的线盘磁条数量越多电感量越高)查资料得知,当今家用电磁炉线盘磁条有6条,8条,看下图 两种类型,绕线圈数,28,30,32,圈。最为常见的为28圈的较多。现在的电磁炉线盘有两种类型.参数为(1)电感量PSD系列为157uH。(2)PD系列为140uH 新型电磁炉线盘 包括线盘支架、线圈、磁条,线圈包括固定在线盘支架上的外环线圈和内环线圈,磁条包括与线圈对应设置的外圈磁条和内圈磁条,外圈磁条和内圈磁条分别呈放射状分布,其特征在于所述内圈磁条与外圈磁条在放射状分布,这样做使加热更均匀。提高加热效率,降低磁场的外泄,减小了电磁炉工作时对周围环境的影响。 关于Q值;是衡量电感器件的主要参数。是指电感器在某一频率的交流电压下工作时,所呈现的感抗与其等效损耗电阻之比。电感器的Q值越高,其损耗越小,效率越高。这个大家应都知道吧~ 再,磁条是分体的,不是整体的其原因,电磁炉工作时磁条不至于形成涡流,而使磁条产生磁饱和现象,要知道磁条磁饱和后线盘电感量会大大降低,这样会损IGBT管的。 有以上所谈可知,电磁炉线盘上的磁条地重要性了,也可以解释我们维修员所提到的不知为什么屡爆IGBT管,但通过换线盘而排除故障的原因所在了。(是有磁条断裂,或磁条老化引起的电感量减小所致)。再就是线盘上的线圈和磁条击穿短路。其实我们在维修电磁炉当中,换炉盘的故障率很低,由于当今家用电磁炉的线盘的参数差别相差不大,为此应急维修互换还是可以的。只不过是电磁炉功率输出略有差异,当然还是换相同参数的为好~。 welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 200 Yuan, construction person in charge a fine of 50 Yuan. (8) no permit to work and the job in accordance with the provisions, on the job unit fined 300 yuan, the unit will charge a fine of 100 Yuan. 7.5.3 accident penalties (1) injuries fatalities directly punished 1~2 million. Direct responsibility for the accident and have the corresponding responsibility of leadership, such as concerning administrative sanctions, should be brought to the company or the relevant Department. (2) personal injury accident occurred, the direct punishment 0.5-10,000 yuan, responsible for the direct responsibility for the accident and the responsibility of leadership, such as concerning administrative sanctions should be dealt with by the personnel Department of the company. (3) personal injury
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