CN104682792B - 直流电机控制电路 - Google Patents
直流电机控制电路 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor
- H02P3/12—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor by short-circuit or resistive braking
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
Abstract
本发明提供一种直流电机控制电路，包括用于连接直流电源的第一及第二直流端口，具有第一及第二输出端口的H桥驱动电路，连接在该第一及第二输出端口之间并与该直流电机串联的钳制电路，和/或连接在该第一及第二输出端口之间并与该直流电机并联的分流电路。该钳制电路的电阻在该直流电机产生反电动势时变大甚至无限大，以降低设置完全隔绝反电动势所产生的电流。该分流电路的电阻在该直流电机产生反电动势时变小甚至变至零，以提供放电路劲来降低甚至完全衰减反电动势。当反电动势消失时，该钳制电路及分流电路的电阻变回正常值。如此，在该直流电机产生反电动势时，该钳制电路和/或分流电路可抑制该反电动势对其它电子元件的影响。
Description
技术领域
本发明涉及直流电机控制电路，尤其涉及一种具有保护功能的直流电机控制电路。
背景技术
用于散热或者排风用的风扇通常采用一个直流电机并且只能往一个固定的方向旋转。在特殊条件下，会出现风扇无法按照原先的方向旋转的情况。比如，用在汽车前端的散热风扇在汽车受到与其前进方向相反的强风，或者用在厨房的排风扇在受到从屋外吹至屋内的强风时，风扇可能出现反转，这将无法实现既定的散热或排风功能。现有的一种解决方案是，在风扇的一侧，比如汽车前端的散热风扇位于汽车前进方向的一侧，或者用在厨房的排风扇面向屋外的一侧设置多个只能按照预定方向开启的挡风板。在正常工作情况下，挡风板在风扇风力的推动下摆动至开启状态，风扇正常进行散热或排风。在出现相反方向的并且大于风扇风力的强风的情况下，挡风板被强风吹至闭合状态，从而防止风扇反转。然而，在风扇不处于工作状态，并且出现与风扇产生的风的方向相同的强风时，比如，出现从屋内吹向屋外的强风时，挡风板会被推至开启状态，风扇扇叶在强风的驱动下旋转，从而使得风扇变成一个发电机，产生反电动势。在外界风力很强的情况下，该反电动势可到达较大的伏值，可能损坏整个风扇控制电路。
发明内容
有鉴于此，本发明提供一种直流电机产生任何方向的反电动势的情况下都不会被损坏的直流电机控制电路。
一种直流电机控制电路，包括第一及第二直流端口，H桥驱动电路以及分流电路。该第一及第二直流端口其用于连接至一个直流电源。该H桥驱动电路包括第一至第四开关，第一及第二开关、第三及第四开关分别串联在第一及第二直流端口之间，第一及第二开关之间、第三及第四开关之间分别具有用于连接该直流电机的第一及第二输出端口。该分流电路连接在该第一及第二输出端口之间并与该直流电机并联，该分流电路的电阻在该直流电机产生反电动势时变小。
一种直流电机控制电路，包括第一及第二直流端口，H桥驱动电路钳制电路。该第一及第二直流端口用于连接至一个直流电源。该H桥驱动电路包括第一至第四开关，第一及第二开关、第三及第四开关分别串联在第一及第二直流端口之间，第一及第二开关之间、第三及第四开关之间分别第一及第二输出端口。该钳制电路与该直流电机串联在该第一及第二输出端口之间，该钳制电路的电阻在该直流电机产生反电动势时变大。
一种直流电机控制电路，包括第一及第二直流端口，H桥驱动电路，分流电路以及钳制电路。该第一及第二直流端口用于连接至一个直流电源。该H桥驱动电路包括第一至第四开关，第一及第二开关、第三及第四开关分别串联在第一及第二直流端口之间，第一及第二开关之间、第三及第四开关之间分别第一及第二输出端口。该钳制电路与该直流电机串联在该第一及第二输出端口之间，该钳制电路的电阻在该直流电机产生反电动势时变大。该分流电路连接在该第一及第二输出端口之间并与该直流电机并联，该分流电路的电阻在该直流电机产生反电动势时变小。
本发明中，当直流电机产生反电动势时，无论反电动势的方向如何，该分流电路，或者钳制电路，或者该两者的组合均可抑制该反电动势产生的电流，从而保护整个电路。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而所附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
图1是本发明第一实施方式的直流电机控制电路原理示意图。
图2是本发明第二实施方式的直流电机控制电路原理示意图。
图3是本发明第三实施方式的直流电机控制电路原理示意图。
图4是本发明第四实施方式的直流电机控制电路原理示意图。
图5是本发明第五实施方式的直流电机控制电路原理示意图。
图6是本发明第六实施方式的直流电机控制电路原理示意图。
图7是本发明第七实施方式的直流电机控制电路原理示意图。
图8是本发明第八实施方式的直流电机控制电路原理示意图。
图9是本发明第九实施方式的直流电机控制电路原理示意图。
具体实施方式
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。附图仅提供参考与说明用，并非用来对本发明加以限制。附图中显示的尺寸仅仅是为了便于清晰描述，而并不限定比例关系。
请参阅图1，本发明第一实施方式的直流电机控制电路10a用于连接并驱动一个直流电机M。直流电机控制电路10a包括第一直流端口V1、第二直流端口V2、H桥驱动电路20以及分流电路40a。
第一及第二直流端口V1，V2用于连接至一个直流电源。H桥驱动电路20包括一个第一开关Q1、第二开关Q2、第三开关Q3以及第四开关Q4。各开关均具有一个控制端，用于控制该开关断开或导通，上述开关可以是BJT或MOSFET等晶体管，并且各开关自身（集电极与射极之间或源极与漏极之间）形成一个二极管。必须指出的是，在本实施方式及下述的实施方式中，开关是以一个简单的开关符号示意出来，未标出其控制端及控制各控制端使该四个开关按照预定的顺序导通而使得直流电机M工作的控制电路。
第一及第二开关Q1，Q2、第三及第四开关Q3，Q4分别串联在第一及第二直流端口V1，V2之间，第一及第二开关Q1，Q2之间、第三及第四开关Q3，Q4之间分别具有用于连接直流电机M的第一输出端口P1及第二输出端口P2。分流电路40a连接在第一及第二输出端口P1，P2之间并与直流电机M并联，分流电路40a的电阻在直流电机M产生反电动势时变小。在本实施方式中，分流电路40a包括一个压敏电阻（Varistor）Rv，其与直流电机M并联。
正常工作过程中，第一及第四开关Q1，Q4同时导通，使电流按照第一方向（如图1中向右的方向）流过直流电机M；接着第二及第三开关Q2，Q3同时导通，使电流按照第二方向（如图1中向左的方向）流过直流电机M，以使直流电机M正常运作。当直流电机M在正常工作过程中受外力的作用而使得其转速高于正常转速，或者直流电机M在非工作状态下受外力作用而转动，而产生反电动势时，直流电机M上的电压便产生变化，根据自身的特征，压敏电阻Rv的电阻因此而变小，从而使得反电动势可通过压敏电阻Rv形成回路而耗散掉，进而避免了对其它电子元件的损害。
本领域技术人员应当知道，具有与压敏电阻Rv类似功能的瞬变电压抑制器（Transient Voltage Suppressor，TVS，图未示）也可用于替代压敏电阻Rv。
优选地，分流电路40a还包括第一电阻R1，其用于在直流电机M产生反电动势的情况下分担压敏电阻Rv上的电压，从而有效降低其温度。
可以理解，在其它实施方式中，也可设置多个分流电路40a与直流电机M并联（图未示），以增加分流支路。
请参阅图2，本发明第二实施方式的直流电机控制电路10b与第一实施方式的直流电机控制电路10a的不同之处在于，第二实施方式的直流电机控制电路10b还包括一个第二电阻R2，一个稳压管Dw，一个第三电阻R3及一个第四电阻R4。具体地，第二电阻R2及稳压管Dw串联在第一及第二直流端口V1，V2之间。第三电阻R3连接在第一开关Q1的控制端与第二输出端口P2之间，第四电阻R4连接在第三开关Q3的控制端与第一输出端口P1之间。
当直流电机M在外力的作用下转动而产生反电动势时，除了第一实施方式所描述的压敏电阻Rv所形成的主要的分流支路外，还可通过下述两个分流支路再形成两个回路。反电动势通过第一开关Q1自身形成的二极管，第二电阻R2，稳压管Dw，第四开关Q4自身形成的二极管流回直流电机M而形成第一回路；同时还通过第一开关Q1的集电极及基极，第三电阻R3流回直流电机M而形成第二回路。
当直流电机M在外力的作用下沿另一个方向转动而产生与上述电极方向相反的反电动势时，类似上述分析，电路将产生与上述第一及第二回路对称的两个分别流过第二电阻R2及第四电阻R4的回路。
因此，无论反电动势的极性方向如何，除了第一实施方式所述的通过压敏电阻Rv的分流回路外，还有上述两个分流回路，从而更好地保护其它电子元件。
优选地，第一及第二直流端口V1，V2之间还连接有一个电容C，用于对加载在第一及第二直流端口V1，V2上的电压进行滤波。
应当指出的是，由于第三及第四电阻R3，R4两个分流支路需要通过各开关自身形成的二极管，因此在本实施方式中，将可用作开关的三极管表示在图2中，以便于理解。然而本领域技术人员应当理解，开关的类型不限图2所示。下述实施方式有出现类似的情况时将不再赘述。
另外，也可以理解，在其它实施方式中，没有稳压管Dw的情况下，也不影响压敏电阻Rv对反电动势所产生的电流的分流作用，因此也可不必设置。下述实施方式中道理相同，将不做赘述。
请参阅图3，本发明第三实施方式的直流电机控制电路10c与第一实施方式的直流电机控制电路10a的不同之处在于，分流电路40c利用继电器Re代替上述压敏电阻Rv。具体地讲，分流电路40b包括一个继电器Re，一个电压检测电路53以及一个控制器54。继电器Re包括连接至第二输出端口P2的第一连接端口51以及连接至第一输出端口P1的第二连接端口52。电压检测电路53连接在第一及第二直流端口V1，V2之间，用于检测第一及第二直流端口V1，V2之间的电压。控制器54连接在电压检测电路53及继电器Re之间，用于在电压检测电路53检测到的电压大于一个预定值时控制继电器Re断开。当然，电压检测电路53以及控制器54也可以集成为一个控制单元。
如此，当直流电机M在外力的作用下转动而产生反电动势时，会使得第一及第二直流端口V1，V2之间电压会产生变化，在电压检测电路53检测到该电压大于一个预定值时，控制器54便控制继电器Re断开，从而切断反电动势电压的回路，进而保护其它电子元件。
可以理解，具有与继电器Re类似功能的晶闸管（Thyristor）、三端双向可控硅元件(TRIAC)、晶体管、MOSFET、雪崩二极管（Avalance diode）等等（图未示)也可用于替代继电器Re。
请参阅图4，本发明第四实施方式的直流电机控制电路10d与第一实施方式的直流电机控制电路10a的不同之处在于，本实施方式用一个钳制电路50a来代替上述分流电路40a。钳制电路50a包括一个正温度系数（Positive Temperature Coefficient，PTC）的热敏电阻。如此，当直流电机M在外力的作用下转动而产生反电动势时，反电动势将加大流过PTC热敏电阻的电流，导致PTC热敏电阻的温度上升，电阻变大，从而抑制反电动势所产生的电流，保护其它电子元件。
请参阅图5，本发明第五实施方式的直流电机控制电路10e与第四实施方式的直流电机控制电路10d的不同之处在于PTC热敏电阻在实际电路板中的位置，以及第五实施方式的直流电机控制电路10e还包括一个第二电阻R2及一个稳压管Dw。第二电阻R2及稳压管Dw的连接方式与第二实施方式描述的一致，在此不做赘述。第五实施方式中，在制成电路板中，PTC热敏电阻与第二电阻R2相互靠近或相互接触。由于直流电机M产生反电动势时，第二电阻R2上也会因有电流流过而升温（第二电阻R2上的电流的产生可以是如第二实施方式所述），因此，有助于PTC热敏电阻的升温，从而使PTC热敏电阻的电阻值升高得更快，更有利于保护其它电子元件。
请参阅图6，本发明第六实施方式的直流电机控制电路10f与第五实施方式的直流电机控制电路10e的不同之处在于，还包括一个第三电阻R3及一个第四电阻R4。正如上述第二实施方式所示，在直流电机M产生任一极性方向的反电动势时，分别由通过第二电阻R2及第三电阻R3的两个回路，或者通过第二电阻R2及第四电阻R4的两个回路来使得流过PTC热敏电阻的电流增加，从而更进一步提高其温度，使其电阻更迅速上升。需指出的是，图6中的PTC热敏电阻可以在实际电路离第二电阻R2较远的位置，也可以是在与第二电阻R2相互靠近或相互接触的位置。
可以理解，在上述第四至第六实施方式中，也可设置多个钳制电路50c与直流电机M串联第一及第二输出端口P1，P2之间（图未示），以增加钳制电流的效果。
请参阅图7，本发明第七实施方式的直流电机控制电路10g与第四实施方式的直流电机控制电路10d的不同之处在于，钳制电路50b利用继电器Re代替上述PTC热敏电阻。具体地讲，钳制电路50b包括一个继电器Re，一个电压检测电路53以及一个控制器54。其中，除了继电器Re是与直流电机M串联在第一及第二输出端口P1，P2之间外，电压检测电路53及控制器54的连接方式与第三实施方式一致，工作原理也类似，在此不做赘述。
请参阅图8，本发明第八实施方式的直流电机控制电路10h与第四实施方式的直流电机控制电路10d在于钳制电路50c。钳制电路50c具有两个串联至直流电机M的晶体管Q5及Q6，并且该两个晶体管Q5及Q6的极性方向相反（即，该两个晶体管自身形成的二极管的极性相反）。在本实施方式中为两个MOSFET管，然而可以理解也可以是如BJT等其它类型的晶体管，并且，晶体管Q5的源极连接至第一输出端口P1，漏极连接至直流电机M，栅极通过第五电阻R5连接至第一输出端口P1的同时，还通过第六电阻R6及第二二极管D1连接至一个控制端Vd；晶体管Q6的连接方式类似，不做赘述。如此，正常工作过程中，控制端Vd接通一个正电压。当开关Q1及Q4截止并且开关Q2及Q3导通时，晶体管Q6将截止。然而部分电流仍可通过晶体管Q6自身形成的二极管流至马达，如此，与晶体管Q6极限方向相反的晶体管Q5将导通，使得直流电机M可正常运行。相反地，开关Q2及Q3截止并且开关Q1及Q4导通时，电流可通过晶体管Q5自身形成的二极管，直流电机M及晶体管Q6形成回路。当直流电机M产生反电动势时，控制端Vd接地，使得两个晶体管Q5及Q6都关闭，如此，反电动势无法通过晶体管Q5及Q6形成电流，从而使得其它电子元件受到保护。当然，其它实施方式中，也可使晶体管Q5及Q6连接不同的控制端，使得正常工作状态下晶体管Q5及Q6都导通，直流电机M产生反电动势时都关闭。
请参阅图9，本发明第九实施方式的直流电机控制电路10i可视为第一与第四实施方式的直流电机控制电路10a，10d的合并。如此，即使直流电机M产生反电动势较小，压敏电阻Rv阻值变小将使得有更大的电流流过PTC热敏电阻，从而使PTC热敏电阻的电阻值升高得更快，更有利于保护其它电子元件。当然，正如第四实施方式所述，PTC热敏电阻还可与第二电阻R2相互靠近或相互接触。如前几个实施方式所述，在其它实施方式中，也可设置多个分流电路40a与直流电机M并联，或者多个钳制电路50a与直流电机M串联，或者在设置多个分流电路40a与直流电机M并联的同时设置多个钳制电路50a与直流电机M串联（图未示）。
优选地，还可设置上述第二及第第六实施方式中的第二电阻R2，稳压管Dw，第三电阻R3及第四电阻R4，甚至电容C，其连接方式及作用如上述，在此不做赘述。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
Claims (19)
1.一种直流电机控制电路，包括：
第一及第二直流端口，其用于连接至一个直流电源；
H桥驱动电路，其包括第一至第四开关，第一及第二开关、第三及第四开关分别串联在第一及第二直流端口之间，第一及第二开关之间、第三及第四开关之间分别具有用于连接该直流电机两端的第一及第二输出端口；
分流电路，其连接在该第一及第二输出端口之间并与该直流电机并联，该分流电路的电阻在该直流电机产生反电动势时变小；
第二电阻以及一稳压管，该第二电阻及稳压管串联在该第一及第二直流端口之间。
2.如权利要求1所述的直流电机控制电路，其特征在于，该分流电路包括压敏电阻。
3.如权利要求2所述的直流电机控制电路，其特征在于，该分流电路还包括与该压敏电阻串联的第一电阻。
4.如权利要求1所述的直流电机控制电路，其特征在于，还包括第三电阻及第四电阻；该第一至第四开关均为晶体管，具有一个控制端；该第三电阻连接在该第一开关的控制端与该第二输出端口之间，该第四电阻连接在该第三开关的控制端与该第一输出端口之间。
5.如权利要求4所述的直流电机控制电路，其特征在于，还包括连接在该第一及第二直流端口之间的电容。
6.一种直流电机控制电路，包括：
第一及第二直流端口，其用于连接至一个直流电源；
H桥驱动电路，其包括第一至第四开关，第一及第二开关、第三及第四开关分别串联在第一及第二直流端口之间，第一及第二开关之间、第三及第四开关之间分别具有第一及第二输出端口；
钳制电路，其与该直流电机串联在该第一及第二输出端口之间，该钳制电路的电阻在该直流电机产生反电动势时变大；
第二电阻以及一稳压管，该第二电阻及稳压管串联在该第一及第二直流端口之间。
7.如权利要求6所述的直流电机控制电路，其特征在于，该钳制电路包括与该直流电机串联在该第一及第二输出端口之间的继电器，以及连接至该继电器的控制单元，该控制单元在该第一及第二直流端口之间的电压大于一个预定值时控制该继电器断开。
8.如权利要求7所述的直流电机控制电路，其特征在于，该控制单元包括连接至该第一及第二直流端口的电压检测电路，以及连接至该电压检测电路及该继电器的控制器，该电压检测电路用于检测该第一及第二直流端口之间的电压，该控制器用于在该检测到的电压大于一个预定值时控制该继电器断开。
9.如权利要求6所述的直流电机控制电路，其特征在于，该钳制电路包括与该直流电机串联在该第一及第二输出端口之间的正温度系数热敏电阻。
10.如权利要求9所述的直流电机控制电路，其特征在于，该热敏电阻与该第二电阻相互靠近或相互接触。
11.如权利要求9所述的直流电机控制电路，其特征在于，还包括第三电阻及第四电阻；该第一至第四开关均为晶体管，具有一个控制端；该第三电阻连接在该第一开关的控制端与该第二输出端口之间，该第四电阻连接在该第三开关的控制端与该第一输出端口之间。
12.如权利要求10或11所述的直流电机控制电路，其特征在于，还包括连接在该第一及第二直流端口之间电容。
13.如权利要求6所述的直流电机控制电路，其特征在于，该钳制电路包括两个与该直流电机串联在该第一及第二输出端口之间的晶体管，该两个晶体管的极性方向相反。
14.一种直流电机控制电路，包括：
第一及第二直流端口，其用于连接至一个直流电源；
H桥驱动电路，其包括第一至第四开关，第一及第二开关、第三及第四开关分别串联在第一及第二直流端口之间，第一及第二开关之间、第三及第四开关之间分别具有第一及第二输出端口；
钳制电路，其与该直流电机串联在该第一及第二输出端口之间，该钳制电路的电阻在该直流电机产生反电动势时变大；及
分流电路，其连接在该第一及第二输出端口之间并与该直流电机并联，该分流电路的电阻在该直流电机产生反电动势时变小；
第二电阻以及一稳压管，该第二电阻及稳压管串联在该第一及第二直流端口之间。
15.如权利要求14所述的直流电机控制电路，其特征在于，还包括第三电阻及第四电阻；该第一至第四开关均为晶体管并具有一个控制端；该第三电阻连接在该第一开关的控制端与该第二输出端口之间，该第四电阻连接在该第三开关的控制端与该第一输出端口之间；该钳制电路包括具有该第一及第二连接端口的正温度系数热敏电阻。
16.如权利要求15所述的直流电机控制电路，其特征在于，该正温度系数热敏电阻与一第一电阻相互靠近或相互接触。
17.如权利要求14所述的直流电机控制电路，其特征在于，还包括串联在该第一及第二直流端口之间的电容。
18.如权利要求14所述的直流电机控制电路，其特征在于，该分流电路包括压敏电阻。
19.如权利要求18所述的直流电机控制电路，其特征在于，该分流电路还包括与该压敏电阻串联的电阻。
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| KR1020140166548A KR102330191B1 (ko) | 2013-11-27 | 2014-11-26 | Dc 모터용 제어 회로 |
| US14/555,394 US9385640B2 (en) | 2013-11-27 | 2014-11-26 | Control circuit for a DC motor |
| JP2014239714A JP2015104313A (ja) | 2013-11-27 | 2014-11-27 | Ｄｃモータ用制御回路 |
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2014
- 2014-11-21 DE DE102014117087.3A patent/DE102014117087A1/de not_active Withdrawn
- 2014-11-26 KR KR1020140166548A patent/KR102330191B1/ko active IP Right Grant
- 2014-11-26 US US14/555,394 patent/US9385640B2/en active Active
- 2014-11-27 JP JP2014239714A patent/JP2015104313A/ja active Pending
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| JP2009254170A (ja) * | 2008-04-08 | 2009-10-29 | Hitachi-Lg Data Storage Inc | モータ駆動回路 |
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| CN202981678U (zh) * | 2012-11-09 | 2013-06-12 | 德昌电机(深圳)有限公司 | 烹饪装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014117087A1 (de) | 2015-05-28 |
| US9385640B2 (en) | 2016-07-05 |
| US20150145450A1 (en) | 2015-05-28 |
| JP2015104313A (ja) | 2015-06-04 |
| KR20150061596A (ko) | 2015-06-04 |
| KR102330191B1 (ko) | 2021-11-23 |
| CN104682792A (zh) | 2015-06-03 |
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