CN2821879Y - 电池组及具有该电池组的无线电动工具 - Google Patents

电池组及具有该电池组的无线电动工具 Download PDF

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CN2821879Y
CN2821879Y CNU2005200181408U CN200520018140U CN2821879Y CN 2821879 Y CN2821879 Y CN 2821879Y CN U2005200181408 U CNU2005200181408 U CN U2005200181408U CN 200520018140 U CN200520018140 U CN 200520018140U CN 2821879 Y CN2821879 Y CN 2821879Y
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discharge switch
battery pack
wireless power
power tools
control
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布鲁斯·丹宁
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/90—Specific system operational feature
    • Y10S388/903—Protective, e.g. voltage or current limit

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Protection Of Static Devices (AREA)
  • Battery Mounting, Suspending (AREA)
  • Portable Power Tools In General (AREA)

Abstract

本实用新型提供一种电池组及具有该电池组的无线电动工具。该电池组包括：至少一个电池、一个连接至所述至少一个电池的放电开关和一个监测和控制电路，该监测和控制电路响应相关联的无线电动工具的扳机的位置以提供一个控制信号至所述放电开关。该放电开关响应所述控制信号以控制提供至所述无线电动工具的负载的放电电流。所述负载可以是一个马达，该马达驱动该无线电动工具的元件。本实用新型还提供了一种工具识别电路，该电路向所述电池组提供特殊无线电动工具的数据。

Description

电池组及具有该电池组的无线电动工具
技术领域
本实用新型涉及无线电动工具，且更具体的是涉及带有改进的电池组的无线电动工具。
背景技术
广泛种类的电动工具被用于不同的应用中例如建筑应用、火灾和营救应用等等。一些无线电动工具的例子包括但不受限于：无线电钻、无线圆锯、无线往复锯、无线砂磨机、无线螺丝起子和闪光灯。无线电动工具使用一个可充电电池组(battery pack)提供能量使工具工作。可以容易地将该可充电电池组从无线电动工具移除并将其连接至一个外置电池充电器以达至充电的目的。
该电池组包括一个或多个电池。该电池组也包括监测电路，该监测电路用来监测参数，例如电池电压值、放电电流和充电电流。该电池组也包括开关，例如一个放电开关，该开关响应监测电路检测到的过载状态而断开。在无线电动工具中采用另一个控制开关用来控制提供至无线电动工具的负载的放电电流。例如，该控制开关可为一个速度控制开关，用来控制无线电动工具的一个元件的速度。这个开关是一个相对昂贵的需要过载保护的开关。因此，在本领域有去除该控制开关但仍提供相同功能的需要。
存在着很多不同的无线电动工具和电池组。一个电池组被设计成应用于多种无线电动工具中。然而，没有办法向电池组通报关于无线电动工具的任何细节。因此，需要一个工具识别电路，用来向一个插入的电池组通报数据，尤其是该无线工具的数据。
实用新型内容
本实用新型提供了一种电池组。该电池组包括至少一个电池、一个连接至至少一个电池的放电开关和监测和控制电路，该监测和控制电路响应一个相连接的无线电动工具的扳机的位置提供一个控制信号至该放电开关，该放电开关响应该控制信号控制提供至所述无线电动工具的负载的放电电流。
本实用新型所述的电池组，所述负载包括一个用来驱动所述无线电动工具的一个元件的马达，所述马达接收由所述放电开关控制的所述放电电流，所述放电开关通过控制所述放电电流控制由所述马达驱动的所述元件的速度。
本实用新型所述的电池组，所述控制信号包括一个脉宽调制信号，所述放电开关响应所述脉宽调制信号的一个占空比控制所述放电电流。
本实用新型所述的电池组，所述监测和控制电路监测所述放电电流，并且当所述放电电流大于或等于一个最大放电电流阈值时断开所述放电开关。
本实用新型所述的电池组，所述放电开关包括一个场效应晶体管。
本实用新型还提供了一种无线电动工具。该无线电动工具包括一个负载、一个扳机和一个电池组。该电池组包括至少一个电池，用来为负载提供能量。该电池组还包括一个连接至该至少一个电池的放电开关和监测和控制电路，该监测和控制电路响应扳机的位置提供一个控制信号至该放电开关。该放电开关响应该控制信号控制提供至负载的放电电流。
本实用新型所述的无线电动工具，所述负载包括一个用来驱动所述无线电动工具的一个元件的马达，所述马达接收由所述电池组的所述放电开关控制的所述放电电流，所述放电开关通过控制所述放电电流控制由所述马达驱动的所述元件的速度。
本实用新型所述的无线电动工具，还包括速度选择电路，所述速度选择电路响应所述扳机的所述位置提供一个输入信号至所述电池组的所述监测和控制电路。
本实用新型所述的无线电动工具，所述速度选择电路包括一个可变电阻，所述可变电阻与一个电阻串联，其中所述可变电阻的电阻值是响应所述扳机的所述位置而设置的且所述电阻值表示所述元件的期望速度，并且其中所述电阻的电阻值表示一个最大放电电流速度。
本实用新型所述的无线电动工具，所述控制信号包括一个脉宽调制信号，所述放电开关响应所述脉宽调制信号的一个占空比控制所述放电电流。
本实用新型所述的无线电动工具，所述监测和控制电路监测所述放电电流，并且在所述放电电流大于或等于一个最大放电电流阈值时断开所述放电开关。
附图说明
有了下文的附图说明，本实用新型的实施例的特征和优点将更显著，并且相同数字表示相同部件，其中：
图1所示为一个无线电动工具的透视图；
图2所示为图1无线电动工具的电源系统的电路图；
图3所示为图2的相关电路图，其中负载是一个驱动无线电动工具的一个元件的马达；
图4所示为图1无线电动工具的电源系统的另一个电路图；
图5所示为监测和控制电路的一个实施例的电路图；
图6所示为一个实施例的工作的流程图。
具体实施方式
尽管下文的具体实施方式将参考所示实施例进行，但许多选择、修改和变动对于本领域技术人员是明显可以存在的。因此，本实用新型旨在涵盖广泛范围。
图1所示为无线电动工具100的透视图。无线电动工具100被表示为一个无线电钻并且在本文相关实施例也将如此表示。然而无线电动工具100可以是任何类型的无线电动工具，包括但不受限于：无线圆锯、无线往返锯、无线砂磨机、无线螺丝起子和闪光灯。无线电动工具包括一个可充电电池组102，用来提供能量使工具100工作。可以容易地将可充电电池组102从无线电动工具100上移除并将其连接至一个外置电池充电器以达到充电的目的。无线电动工具100也包括一个扳机104。对于电钻，使用者压和放扳机104以控制卡盘142的速度。对于其他工具例如闪光灯，使用者可以设置扳机的位置以控制闪光灯的亮度。
图2所示为图1无线电动工具的电源系统200的电路图。电源系统200包括电池组102、负载240、扳机104和工具识别(ID)电路230。本文任一实施例所使用的“电路”可包括：例如单个固定电路、可编程电路、状态机电路，和/或储存由可编程电路执行的指令的固件，或这些电路的任意组合。
电池组102包括一个或多个电池203，用来为系统200提供能量。电池203在一个实施例中可为锂离子电池。电池组102通过放电开关209向负载240提供能量。在一个实施例中，放电开关可为一个场效应晶体管(FET)。电池组102也包括监测和控制电路208。监测和控制电路208为每一个电池测量一个或多个电池组电流、温度和电池电压值。
监测和控制电路208比较所测值和相关联的阈值，并且当所测值中的一个超过或等于相关阈值时识别一个过载状态。例如，过载状态可以是一个大于或等于一个表示最大放电电流的阈值的放电电流。在另一个例子中，过载状态可以是一个提供至电池203的大于或等于一个表示最大充电电流的阈值的充电电流值。在另一个例子中，过载状态可以是一个电池的大于或等于一个电压阈值的电压值。在另一个实施例中，过载状态可以是一个大于或等于一个温度阈值的元件的温度。检测到过载状态时监测电路208就会提供一个输出控制信号用来保护电源系统200的元件。该输出控制信号被提供至电池组102的一个或多个开关，或被当作一个控制输入通过路径127提供至其他外置于电池组102的电路。在一个实施例中，该输出控制信号被提供至放电开关209用来断开开关209，其中过载状态为一个来自电池203的大于或等于一个最大放电电流阈值的放电电流。
监测和控制电路208也响应扳机104的位置提供一个控制信号至放电开关209。该控制信号在一个实施例中可为一个脉宽调制(PWM)信号218，且放电开关209响应PWM信号218的占空比控制该放电电流。PWM信号218在一个固定频率工作，例如5至10千赫(KHz)。当PWM信号占空比增加时，放电开关209的闭合时间增加，因此提供至负载240的放电电流值增加。相似地，当PWM信号的占空比减少时，放电开关的闭合时间减少，因此提供至负载240的放电电流值减少。
工具识别电路230提供一个工具识别信号至监测和控制电路208。该工具识别信号可表示数据，尤其是无线电动工具的数据，例如特殊无线电动工具的多种电源参数。例如，工具识别信号可表示一个特殊的无线电动工具的最大放电电流。另一个例子，工具识别信号可表示无线电动工具的热过载点。工具识别电路230包括便宜的无源元件，例如在实施例中的并联的电阻和电容。在另一实施例中，工具识别电路230可包括一个简单的固定电阻用来传输一个特定无线电动工具的热过载点。另外，工具识别电路230还可以提供一个有用的次要指示：电池组102被正确地插入无线电动工具。在没有适当的工具识别信号的情况下，电池组102将拒绝放电从而提高了系统的安全性。
图3所示为图2电源系统200相关的电源系统300的电路图。图3中与图2相似的元件以相同的参数标注，所以为了清晰在此省略任何重复的描述。图3的负载240a可为一个马达340，用来通过一个相连的齿轮系(未示出)驱动元件142。举一个例子，元件142可为图1电钻的用来控制电钻的钻头的卡盘。更优越的是可以去除一个置于无线电动工具的马达340输入侧的传统速度控制开关。在它的位置上，放电开关209控制放电电流从而控制由马达340驱动的元件142的速度。
速度选择电路316接收一个来自扳机104的表示扳机104位置即表示无线电动工具的元件142的期望速度的信号。然后速度选择电路316提供一个表示期望速度的输入信号至电池组102的监测和控制电路208。接着监测和控制电路208提供一个控制信号至放电开关209，通过控制提供至马达340的放电电流来控制元件142的速度。
在无线电动工具工作时，其使用者摁压扳机104至一个期望的量来控制元件142的速度。速度选择电路316响应扳机104的位置提供一个输入信号至监测和控制电路208。监测和控制电路208包括一个PWM发生器，该发生器响应速度选择电路316的输入信号更改PWM信号218的占空比。PWM信号218在一个固定频率工作，例如5至10千赫。当PWM信号的占空比增加时，放电开关209的闭合时间也增加，因此无线电动工具的元件142的速度就增加。类似地，当PWM信号的占空比减少时，放电开关209的闭合时间减少，这样电动工具的元件142的速度就减少。在一个例子中，PWM信号的占空比可以有一个从大约10％(慢速)至75％(快速)的变化。
图4所示为图1无线电动工具的电源系统的另一个电路图。放电开关209为场效应晶体管Q1。场效应晶体管Q1可为一个金属氧化半导体场效应晶体管(MOSFET)，例如一个p通道金属氧化半导体场效应晶体管(PMOS)或一个n通道金属氧化半导体场效应晶体管(NMOS)。电池组102a也包括多个电池203-1、203-2、...、203-(n-1)和203-n。电池组102a为多个负载提供能量，包括表示为一个马达绕组的负载240b。二极管410与场效应晶体管Q1并联以允许充电电流流入电池203-1、203-2、...、203-(n-1)和203-n，并且防止来自电池的放电电流。电池组102a包括可选择的状态指示器406，用来提供来自监测和控制电路208的不同被测状态的指示信号。
速度选择电路316a包括一个可变电阻454，该电阻与另一个电阻452串联。可变电阻454可为一个电位计。可变电阻454的电阻值通过响应扳机104的位置而被设置。因此可变电阻454的电阻值就代表元件142(见图3)的一个期望速度。电阻452的电阻值表示一个最大放电电流速度。考虑到低成本无线电动工具，例如闪光灯，速度选择电路316a允许便宜的放电限制和/或可变的电源控制。监测和控制电路208利用第三电池组端口422接收来自速度选择电路316a关于期望速度的信息。然后监测和控制电路208会在一个特定的占空比提供一个PWM信号218以达到所期望的速度。
图5所示为监测和控制电路208的一个实施例208a。监测和控制电路208a包括开关网络502、模拟-数字转换器(ADC)504、处理器506、驱动器508、保护电路524和PWM发生器510。处理器506命令开关网络502选择一个特定电池203-1、203-2、...、203-(n-1)和203-n来监测。然后每个电池各自的模拟电池电压值通过开关网络502被取样。被取样的模拟信号然后被ADC504转换为相关数字信号并被提供至处理器506。因此处理器506接收来自ADC504的代表各个电池203-1、203-2、...、203-(n-1)和203-n的电压值的数字信号，并将这些信号与不同的电压阈值做比较。
例如，当电池组102充电时，监测和控制电路208a监测电池电压值以判断是否有电池电压值超过一个过压阈值。如果有电池电压超过阈值，那么处理器506将采取一些预防举措。例如，通过提供一个信号至驱动器508断开一个特定的开关从而使充电停止。例如，在电池组102放电时，监测和控制电路208a监测电压值以判断是否有电池电压值小于一个欠压阈值。如果有电池电压小于欠压阈值，处理器506将会采取一些预防举措。例如，通过提供一个信号至驱动器508断开一个特定的开关从而使放电停止。
处理器506也接收来自保护电路524的其他信号。保护电路524通常监测流入(充电模式)或流出(放电模式)电池组102的电流以发现不同的电流过载状态，例如过流或短路状态，并且向处理器506警报此类状况的发生使其采取预防措施。例如，一个电流感测元件如感测电阻404(图4)，该电阻可在流入或流出电池组的电流值变化时向保护电路524提供一个代表该电流值的信号。保护电路524将比较该电流值和不同的阈值，然后向处理器506提供一个信号通知处理器一个过流状态或一个短路状态，这样处理器506就将采取预防措施。
PWM发生器510接收一个来自速度选择电路316、316a的信号，并向放电开关例如场效应晶体管Q1(见图4)提供一个输出PWM信号。处理器506允许PWM信号控制放电开关的状态直到一个过载状态发生为止。当过载状态发生时，例如额外的放电电流，处理器506使PWM发生器510失效，并命令驱动器508断开放电开关。这样监测和控制电路208a可以更好地使PWM发生器510在适当的时候控制放电开关209，并且当过载状态发生监测和控制电路208a也可以使PWM发生器510失效并断开放电开关。
图6所示为一个实施例的工作流程图600。操作602包括监测一个无线电动工具的扳机的位置。操作604包括控制电池组的放电开关的状态响应所述扳机的所述位置以控制提供至所述无线电动工具负载的放电电流。
更优越的是去除传统的速度控制或负载控制开关将节约成本，并且简化了电路结构的复杂性。此类速度或负载控制可由电池组内的放电开关完成。另外，一个无线电动工具还包括工具识别电路。该工具识别电路可使电池组接收特殊工具的数据，否则将没有办法得知这些数据。此类数据包括特殊无线电动工具的最大放电电流的数据、特殊工具的热过载点的数据以指出一个连接。另外，工具识别电路提供一个有用的次要指示：电池组已经被正确地插入适当的无线电动工具中。在没有适当的工具识别信号时，电池组将拒绝放电从而改进了系统的安全性。
本文所使用的术语与措辞是揭示内容的术语，但没有局限性，并且在采用这些术语和措辞时不排除其他与本文所展示和描述的特征(或部分特征)相似的等价物，应该明白在权利要求范围内本实用新型可能有多种修改。本实用新型还可能存在其他的修改、变动和选择。因此，权利要求旨在覆盖所有这些等同物。

Claims (11)

1、一种电池组，包括：
至少一个电池；
一个放电开关，所述放电开关与所述至少一个电池连接；
其特征在于，所述电池组还包括：
监测和控制电路，所述监测和控制电路响应一个相关联的无线电动工具的一个扳机的一个位置从而提供一个控制信号至所述放电开关，所述放电开关响应所述控制信号从而控制一个提供至所述无线电动工具的一个负载的放电电流。
2、根据权利要求1所述的电池组，其特征在于：所述负载包括一个用来驱动所述无线电动工具的一个元件的马达，所述马达接收由所述放电开关控制的所述放电电流，所述放电开关通过控制所述放电电流控制由所述马达驱动的所述元件的速度。
3、根据权利要求1所述的电池组，其特征在于：所述控制信号包括一个脉宽调制信号，所述放电开关响应所述脉宽调制信号的一个占空比控制所述放电电流。
4、根据权利要求1所述的电池组，其特征在于：所述监测和控制电路监测所述放电电流，并且当所述放电电流大于或等于一个最大放电电流阈值时断开所述放电开关。
5、根据权利要求1所述的电池组，其特征在于：所述放电开关包括一个场效应晶体管。
6、一种无线电动工具，包括：
一个负载；
一个扳机；和
一个电池组，所述电池组包括至少一个为所述负载提供能量的电池，所述电池组还包括一个连接至所述至少一个电池的放电开关，
其特征在于，所述电池组还包括：
监测和控制电路，所述监测和控制电路响应所述扳机的一个位置从而提供一个控制信号至所述放电开关，所述放电开关响应所述控制信号以控制一个提供至所述负载的放电电流。
7、根据权利要求6所述的无线电动工具，其特征在于：所述负载包括一个用来驱动所述无线电动工具的一个元件的马达，所述马达接收由所述电池组的所述放电开关控制的所述放电电流，所述放电开关通过控制所述放电电流控制由所述马达驱动的所述元件的速度。
8、根据权利要求7所述的无线电动工具，其特征在于：还包括速度选择电路，所述速度选择电路响应所述扳机的所述位置提供一个输入信号至所述电池组的所述监测和控制电路。
9、根据权利要求8所述的无线电动工具，其特征在于：所述速度选择电路包括一个可变电阻，所述可变电阻与一个电阻串联，其中所述可变电阻的电阻值是响应所述扳机的所述位置而设置的且所述电阻值表示所述元件的期望速度，并且其中所述电阻的电阻值表示一个最大放电电流速度。
10、根据权利要求6所述的无线电动工具，其特征在于：所述控制信号包括一个脉宽调制信号，所述放电开关响应所述脉宽调制信号的一个占空比控制所述放电电流。
11、根据权利要求6所述的无线电动工具，其特征在于：所述监测和控制电路监测所述放电电流，并且在所述放电电流大于或等于一个最大放电电流阈值时断开所述放电开关。
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HK1104681A1 (en) 2008-01-18
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WO2005112221A3 (en) 2006-01-19
JP4917019B2 (ja) 2012-04-18
JP2005354889A (ja) 2005-12-22
EP1594209A1 (en) 2005-11-09
WO2006011938A3 (en) 2007-03-29
TW200604773A (en) 2006-02-01
JP4819037B2 (ja) 2011-11-16
US20050248309A1 (en) 2005-11-10
TW200605466A (en) 2006-02-01
CN1934762A (zh) 2007-03-21
CN100555796C (zh) 2009-10-28
TWI268839B (en) 2006-12-21
JP2007536098A (ja) 2007-12-13
TWI292647B (en) 2008-01-11
CN101036260A (zh) 2007-09-12
EP1743410A2 (en) 2007-01-17
EP1743410A4 (en) 2008-05-07
WO2005112221A2 (en) 2005-11-24
EP1668760A2 (en) 2006-06-14
US7119516B2 (en) 2006-10-10
US20050248318A1 (en) 2005-11-10
WO2006011938A2 (en) 2006-02-02
TWI257035B (en) 2006-06-21
US7385795B2 (en) 2008-06-10
CN100479293C (zh) 2009-04-15
HK1102065A1 (en) 2007-11-02
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CN1694330A (zh) 2005-11-09
TW200603963A (en) 2006-02-01

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