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公开(公告)号：US5666715A
公开(公告)日：1997-09-16
申请号：US498242
申请日：1995-07-05
CPC分类号： B25D11/064 , H01R43/015 , H05K13/06 , Y10T29/5151 , Y10T29/53226
摘要： A pistol-configured, solenoid driven wire cutting and seating tool is connectable by way of a standard power cord to an AC voltage source and is used to seat and cut a wire by squeezing a trigger that operates a solenoid control circuit. The tool has a pistol-shaped grip and a generally cylindrically shaped barrel having a main barrel body and a nose portion. The solenoid has a bore adjacent to a butt region of the barrel, coextensive with a longitudinal axis of the barrel and accommodating the translation of a solenoid plunger. A solenoid plunger extension hammer extends from an end of the solenoid plunger, so that the plunger extension hammer extends into a generally annular cavity of the solenoid bore. Surrounding the solenoid plunger extension hammer is a solenoid return compression spring. A wire seating and cutting tool holder is axially translatable within the nose portion of the barrel. The tool holder receives a shaft of a wire seating and cutting tool and has a neck surrounded by a tool holder return compression spring. The solenoid control circuit includes an energizing current supply switch coupled in circuit with a power supply and the solenoid winding, and a switch control circuit, which is responsive to the operation of the trigger mechanism to render the energizing current supply switch conductive for a prescribed period of time and thereby apply an associated duration of firing current to the solenoid winding.
摘要翻译： 手枪式配置的电磁线圈切割和座椅工具可以通过标准电源线连接到交流电压源，并用于通过挤压操作电磁阀控制电路的触发器来固定和切割电线。 该工具具有手枪形握柄和大体圆柱形的桶，其具有主筒主体和鼻部。 螺线管具有与筒的对接区相邻的孔，与筒的纵向轴线共同延伸并且容纳螺线管柱塞的平移。 螺线管柱塞延伸锤从螺线管柱塞的端部延伸，使得柱塞延伸锤延伸到螺线管孔的大致环形空腔中。 螺线管柱塞延伸锤周围是一个电磁回路压缩弹簧。 电线座和切割工具夹具可在筒的鼻部内轴向平移。 工具架接收线座和切割工具的轴，并且具有由工具架返回压缩弹簧包围的颈部。 电磁控制电路包括与电源和电磁线圈耦合在一起的通电电流供给开关，以及开关控制电路，其响应于触发机构的操作，使通电电流供给开关导通规定的时间 从而将相关联的持续时间施加到螺线管绕组。
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公开(公告)号：US4129788A
公开(公告)日：1978-12-12
申请号：US790976
申请日：1977-04-26
CPC分类号： H02M3/33561 , Y10T307/25 , Y10T307/593
摘要： A DC to DC converter has an unregulated input and provides a pair of regulated outputs which independently provide variable power on demand to two independent loads at a substantially constant output voltage. The converter includes three major sections, the input oscillator and pulse width modulation section, the isolated negative DC regulator and the isolated positive DC regulator. Each of the DC regulators is current limited and each is provided with overvoltage protection. One of the output regulators provides improved efficiency through the use of a pair of appropriately connected catch diodes which decrease current change through a filtering inductor, and through implementation of a combined regulator preload resistor and AC pulse width modulating switching transistor drive current source. The converter is a compact modular unit having a low profile with circuit components arranged to minimize temperature instability.
摘要翻译： DC-DC转换器具有未调节的输入，并提供一对稳压输出，它们在基本上恒定的输出电压下独立地向两个独立负载提供可变功率。 该转换器包括三个主要部分：输入振荡器和脉冲宽度调制部分，隔离负DC调节器和隔离正DC调节器。 每个DC稳压器都是电流限制的，每个都有过压保护。 其中一个输出稳压器通过使用一对适当连接的捕捉二极管来提高效率，捕获二极管通过滤波电感降低电流变化，并通过实现组合调节器预负载电阻和交流脉宽调制开关晶体管驱动电流源。 该转换器是具有低轮廓的紧凑的模块化单元，其中电路部件布置成使温度不稳定性最小化。
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公开(公告)号：US5726853A
公开(公告)日：1998-03-10
申请号：US618323
申请日：1996-03-19
摘要： An overvoltage protection circuit prevents damage to the electronic circuitry of a craftsperson's test set, in the event of accidental application of a potentially destructive high voltage to one or more leads of the test set. The test set's dial pulsing circuitry employs a power-dissipating N-channel MOSFET as the operative switching component. The protection circuit is coupled to the MOSFET and includes a power-dissipation controlled current-limiting and timing circuit, either as an electronic or thermostat-based implementation. During the dialing mode, the current path through the power MOSFET is alternately turned on and off by the test set's internal dial pulse control circuitry. At all times, the protection circuit provides instantaneous overvoltage protection and constant current limiting. If the excess voltage condition last long enough, the timing circuit regulates average current flow by alternately turning the MOSFET on and off, in a manner that limits average power dissipation in the MOSFET to less than a destructive value. Modulation of the current flow path through the MOSFET is based upon the product of its (source-drain) loop current and its drain-source voltage V.sub.DS, which depends upon the magnitude of the line voltage.
摘要翻译： 如果意外将潜在的破坏性高电压施加到测试仪的一个或多个引线，则过电压保护电路可以防止对工匠测试仪的电子电路的损坏。 测试仪的拨号脉冲电路采用功率消耗N沟道MOSFET作为有效的开关元件。 保护电路耦合到MOSFET，并且包括作为基于电子或恒温器的实现的功率耗散控制的限流和定时电路。 在拨号模式下，通过功率MOSFET的电流路径由测试仪的内部拨号脉冲控制电路交替打开和关闭。 在任何时候，保护电路提供瞬时过电压保护和恒流限制。 如果过电压条件持续足够长时间，则定时电路通过交替地使MOSFET导通和关断来调节平均电流，从而将MOSFET中的平均功耗限制在小于破坏性值。 通过MOSFET的电流流动路径的调制基于其（源极 - 漏极）环路电流及其漏极 - 源极电压VDS（其取决于线路电压的幅度）的乘积。
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公开(公告)号：US5534768A
公开(公告)日：1996-07-09
申请号：US193816
申请日：1994-02-09
IPC分类号： G05F1/577
CPC分类号： G05F1/577 , Y10T307/675
摘要： A regulated power supply automatically accommodates either a positive or negative polarity connection of a power source and without regard as to whether the source is an DC or an AC source, and accommodating a wide range of input voltage sources. The power supply circuit includes a source voltage conditioning unit which includes an input fuse section, a surge protection circuit, a power switch, and a filter rectifier section, coupled in circuit between a set of external power source connection terminals and a set of output terminals from which a rectified and filtered intermediate voltage is derived. An open fuse detector alerts servicing personnel to an open condition of a user-replaceable input fuse. A DC-DC converter section includes a start up supply circuit and a primary drive winding of a power transformer connected to receive the intermediate rectified voltage from the filter rectifier of the input section. The primary drive winding is coupled to power switch MOSFETs, which drive the primary winding drive current under the control of a pulse width modulator (PWM). The outputs of plural secondary windings are rectified, filtered, and regulated. The rectified output of a selected secondary winding is monitored by way of current limiting and voltage feedback circuits to control the operation of the PWM.
摘要翻译： 稳压电源自动地容纳电源的正极性或负极性连接，并且不考虑源是DC还是AC源，并且适应宽范围的输入电压源。 电源电路包括源电压调节单元，其包括输入保险丝部分，浪涌保护电路，电源开关和滤波器整流器部分，其耦合在一组外部电源连接端子和一组输出端子之间的电路中 从中得到整流和滤波的中间电压。 一个开放的保险丝检测器可以向维修人员提醒用户可更换输入保险丝的开启状态。 DC-DC转换器部分包括启动电源电路和连接成从输入部分的滤波整流器接收中间整流电压的电力变压器的初级驱动绕组。 主驱动绕组耦合到功率开关MOSFET，其在脉宽调制器（PWM）的控制下驱动初级绕组驱动电流。 多个次级绕组的输出被整流，滤波和调节。 通过电流限制和电压反馈电路监视所选次级绕组的整流输出，以控制PWM的工作。
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公开(公告)号：US4707848A
公开(公告)日：1987-11-17
申请号：US889276
申请日：1986-07-25
申请人： Thomas W. Durston , George D. Fleitz , Steven R. Coffelt , James D. Eckman , Wayne K. Wong , Theodore E. Chavannes
发明人： Thomas W. Durston , George D. Fleitz , Steven R. Coffelt , James D. Eckman , Wayne K. Wong , Theodore E. Chavannes
CPC分类号： H04M3/30
摘要： The telephone line test capability of a craftsperson's test set is supplemented by communication/interface circuitry which carries out data communications with a host central office control processor, and contains memory for storing (task assignment) information downloaded from the central office control processor. This task assignment information stored in the test set-communications unit may be coupled from the unit to an associated printer for providing a hard copy of service assignment information to the field technician. In addition to printing out the downloaded task assignment information, the printer unit contains a charging circuit which charges a rechargeable battery in the handset for powering its internal circuitry. During off-duty hours, the test set may be connected to a home dispatch unit installed in the craftsperson's home and through which the handset is coupled to a telephone link for providing off-duty communications with the central office processor without technician intervention. The home dispatch unit also contains a battery charging circuit through which the test set's internal battery is charged when the test set is coupled to the dispatch unit and communications between the central office and the test set-communication unit are not taking place.
摘要翻译： 技术人员测试集的电话线测试能力由与主机中央局控制处理器进行数据通信的通信/接口电路补充，并且包含用于存储从中央局控制处理器下载的（任务分配）信息的存储器。 存储在测试集通信单元中的该任务分配信息可以从该单元耦合到相关联的打印机，以向现场技术人员提供服务分配信息的硬拷贝。 除了打印下载的任务分配信息之外，打印机单元还包含一个充电电路，为手机中的可再充电电池充电，为其内部电路供电。 在下班时间，测试仪可以连接到安装在技工家中的家庭调度单元，并且手机与电话线路相连接，以便在没有技术人员干预的情况下提供与中心局处理器的不在线通信。 家庭调度单元还包含电池充电电路，当测试组耦合到调度单元时，测试仪的内部电池被充电，并且中心局和测试仪组通信单元之间的通信不发生。
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