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1.发明授权Method and apparatus for protecting an integrated circuit from current overload 失效用于保护集成电路免受电流过载的方法和装置
公开(公告)号：US5710690A
公开(公告)日：1998-01-20
申请号：US488885
申请日：1995-06-09
IPC分类号： H02H3/08 , H03K17/082 , H03K17/284 , H02H3/18
CPC分类号： H03K17/284 , H03K17/0822
摘要： A non-dissipative device for protecting an integrated circuit having multiple independent channels against overloading. The non-dissipative device includes an input terminal and an output terminal having an integrated switch connected therebetween which consists of an input portion, a logic gate with two inputs a control portion, and an output portion, all connected in series with one another. The device further includes a generating circuit for generating the on-times and off-times of the integrated switch, the generating circuit is connected between an output of the output portion and an input of the logic gate.
摘要翻译： 一种用于保护具有多个独立通道的集成电路以防超载的非耗散装置。 非耗散装置包括输入端子和输出端子，其具有连接在其间的集成开关，其由输入部分，具有两个输入的控制部分的逻辑门和输出部分组成，所述输出部分彼此串联连接。 该装置还包括用于产生集成开关的导通和关断时间的发生电路，该发生电路连接在输出部分的输出端和逻辑门的输入端之间。
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2.发明授权Protection circuit and method for power transistors, voltage regulator using the same 失效功率晶体管的保护电路和方法，使用相同的电压调节器
公开(公告)号：US5789971A
公开(公告)日：1998-08-04
申请号：US560001
申请日：1995-11-17
CPC分类号： G05F1/573
摘要： A protection circuit for at least one power transistor which has at least one control terminal and two main conduction terminals defining a main conduction path includes a first detection means designed to generate a first electrical signal approximately proportional to current flowing in the main conduction path. Second detection means are designed to generate a second electrical signal approximately proportional to voltage across the main conduction path. Multiplying means receive at input the first and second signals and are designed to generate an electrical product signal substantially corresponding to the product of at least the latter. A generator generates an electrical reference signal, and operational amplifier means receive at input the product signal and the reference signal and are designed to generate an electrical difference signal substantially corresponding to their difference. Control means are designed to drive the control terminal on the basis of the difference signal so that the product signal is not greater than the reference signal.
摘要翻译： 用于至少一个功率晶体管的保护电路，其具有至少一个控制端子和限定主导电路径的两个主导电端子，包括设计成产生与在主导通路径中流动的电流近似成比例的第一电信号的第一检测装置。 第二检测装置被设计成产生与主传导路径上的电压近似成比例的第二电信号。 乘法装置在输入端处接收第一和第二信号，并被设计成产生基本上对应于至少后者的乘积的电产品信号。 发生器产生电参考信号，并且运算放大器装置在输入端接收产品信号和参考信号，并且被设计成产生基本上与其差异相对应的电差信号。 控制装置被设计成基于差分信号驱动控制终端，使得乘积信号不大于参考信号。
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公开(公告)号：US5656969A
公开(公告)日：1997-08-12
申请号：US449855
申请日：1995-05-24
IPC分类号： H03K17/567 , H03G1/00 , H03K17/00 , H03K17/042 , H03K17/16 , H03K17/687
CPC分类号： H03G1/0029 , H03G1/0023 , H03K17/04206 , H03K17/166 , H03K2217/0036
摘要： Power consumption by the driving circuitry of an output stage, employing a slew-rate controlling operational amplifier, is reduced by modulating the level of the current output by the operational amplifier in function of the working conditions of the output stage. Switching delay may also be effectively reduced. An auxiliary current generator forces an additional current through the conducting one of the pair of input transistors of the operational amplifier only during initial and final phases of a transition, essentially when the slew rate control loop ceases to be effective. The boosting of the bias current through the conducting input transistor is determined by the degree of unbalance of the differential input stage of the operational amplifier, without the use of dissipative sensing elements.
摘要翻译： 利用输出级的工作条件，通过调制运算放大器的电流输出电平，降低采用摆率控制运算放大器的输出级的驱动电路的功耗。 切换延迟也可以有效降低。 辅助电流发生器仅在转换的初始和最后阶段迫使额外的电流通过运算放大器的一对输入晶体管中的导通一个电流，基本上当压摆率控制回路不再有效时。 通过导通输入晶体管的偏置电流的升压由运算放大器的差分输入级的不平衡度决定，而不使用耗散感测元件。
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公开(公告)号：US5831466A
公开(公告)日：1998-11-03
申请号：US777182
申请日：1996-12-27
IPC分类号： H03K17/08 , H03K17/082 , H02H1/00
CPC分类号： H03K17/0822 , H03K2017/0806 , H03K2217/0063 , H03K2217/0072
摘要： The present invention is aimed at providing a method and a circuit for protecting the output stage of a power actuator against voltage transients of the surge type. In particular, it provides protection against voltage surge transients of the kind described by International Standard IEC 801-5, for a power transistor contained in the output stage of the actuator. The method of this invention provides for: the utilization of the power transistor (PW) intrinsic diode (DP) for dumping the transient energy to one of the supply generator terminals during a positive transient; and the utilization of the power transistor (PW) restoration feature to the on state for dumping the energy thereinto during a negative transient, while simultaneously inhibiting the current limiting function. The power transistor (PW) is turned on again, and the current limiting circuit (4) inhibited, by the following steps: a) generating an electric signal which is substantially proportional to the voltage appearing at the output terminal (OUT) of the actuator; b) driving the control terminal (G) of the power transistor (PW) by means of said electric signal, and causing said transistor to conduct, while simultaneously disabling the current limiting circuit (4) when the output voltage exceeds a predetermined threshold; and c) allowing the transient energy to be dissipated to the power transistor (PW).
摘要翻译： 本发明的目的在于提供一种用于保护功率执行器的输出级的方法和电路，以防止浪涌型的电压瞬变。 特别地，它提供了针对包含在执行器的输出级中的功率晶体管的国际标准IEC 801-5所述类型的电压浪涌瞬变的保护。 本发明的方法提供：功率晶体管（PW）本征二极管（DP）用于在正瞬变期间将瞬态能量倾倒到一个供电发生器端子; 以及在负瞬态期间将功率晶体管（PW）恢复特性应用于导通状态以将能量倾倒在其中，同时抑制电流限制功能。 功率晶体管（PW）再次导通，并且限流电路（4）通过以下步骤来禁止：a）产生与执行器的输出端（OUT）出现的电压基本成正比的电信号 ; b）通过所述电信号驱动功率晶体管（PW）的控制端（G），并使所述晶体管导通，同时在所述输出电压超过预定阈值时使所述限流电路（4）同时禁用; 和c）允许瞬态能量被耗散到功率晶体管（PW）。
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公开(公告)号：US5874850A
公开(公告)日：1999-02-23
申请号：US919592
申请日：1997-08-05
摘要： A charge pump MOS voltage booster has reduced voltage drops and ripple. This voltage booster is advantageously used in two applications. The voltage has four MOS transistors instead of diodes in a classical voltage booster, which exhibit an undesired voltage drop. The voltage booster also has an oscillator with two outputs and two corresponding charge transfer capacitors. In this manner, the undesired voltage drops and ripple are reduced without complicating the circuitry structure.
摘要翻译： 电荷泵MOS升压器降低了电压降和纹波。 该升压器有利地用于两个应用中。 电压具有四个MOS晶体管，而不是典型的升压器中的二极管，其表现出不期望的电压降。 升压器还具有带两个输出的振荡器和两个相应的电荷转移电容器。 以这种方式，不需要电压降和纹波减小而不使电路结构复杂化。
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6.发明授权Circuit for generating a reference voltage and detecting an under voltage of a supply and corresponding method 失效用于产生参考电压和检测电源的欠压的电路和相应的方法
公开(公告)号：US5747978A
公开(公告)日：1998-05-05
申请号：US622459
申请日：1996-03-22
摘要： A circuit for generating a reference voltage and detecting a drop in a supply voltage, comprising at least one threshold comparator having an input terminal and an output terminal, and a voltage divider connected between a first supply voltage reference and a second voltage reference and connected to the input terminal of the comparator, further provides for the output terminal of said comparator to be connected to the input terminal through at least one feedback network comprising at least one current generator. The feedback network further comprises a buffer block having an input terminal connected to said comparator and a first output terminal connected to a switch which is connected between a circuit node of said voltage divider and the second voltage reference.
摘要翻译： 一种用于产生参考电压并检测电源电压下降的电路，包括至少一个具有输入端和输出端的阈值比较器，以及分压器，连接在第一电源电压基准和第二电压基准之间，并连接到 比较器的输入端还通过包括至少一个电流发生器的至少一个反馈网络提供所述比较器的输出端子连接到输入端子。 反馈网络还包括缓冲块，其具有连接到所述比较器的输入端子和连接到开关的第一输出端子，该开关连接在所述分压器的电路节点和第二参考电压之间。
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公开(公告)号：US5760613A
公开(公告)日：1998-06-02
申请号：US648502
申请日：1996-05-15
IPC分类号： G01R19/165 , G01R31/02 , G05B19/042 , G05B19/05 , H03K17/18 , G05F1/565
CPC分类号： G01R31/026 , G05B19/0423
摘要： A method for detecting an open load includes the use of a driver having at least one main power transistor connected to the load and one auxiliary transistor connected in parallel with the main transistor between a first power supply voltage reference and a second voltage reference. The method compares a first voltage present on a terminal connected to the load of the main transistor with a second voltage present on a terminal of the auxiliary transistor. A circuit for detecting an open load performs the method.
摘要翻译： 用于检测开路负载的方法包括使用具有连接到负载的至少一个主功率晶体管的驱动器和在第一电源参考电压和第二电压基准之间与主晶体管并联连接的一个辅助晶体管。 该方法将连接到主晶体管的负载的端子上存在的第一电压与辅助晶体管的端子上存在的第二电压进行比较。 用于检测开路负载的电路执行该方法。
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8.发明授权
公开(公告)号：US5668508A
公开(公告)日：1997-09-16
申请号：US623613
申请日：1996-03-29
IPC分类号： H03F3/45 , H03K3/011 , H03K3/0231 , H03K3/354 , H03K4/06 , H03K19/0948
CPC分类号： H03K3/011 , H03K3/0231 , H03K3/354
摘要： An oscillating circuit including a capacitor, a charge circuitry and a control circuitry. The charge circuitry includes first and second current generators having respectively first and second current values that are opposite in direction and a switching circuit designed to couple alternately the generators to the capacitor. The control circuitry has a voltage input coupled to the capacitor and an output coupled to control inputs of the switching circuit and includes a comparator with hysteresis having a lower threshold and an upper threshold. The difference between the upper threshold and the lower threshold is chosen to be substantially proportional to the ratio of the product to the sum of the two current values such that the oscillation frequency and the duty cycle do not depend on the supply voltage, the temperature and the process.
摘要翻译： 一种包括电容器，充电电路和控制电路的振荡电路。 充电电路包括分别具有与方向相反的第一和第二电流值的第一和第二电流发生器以及设计成将发电机交替耦合到电容器的开关电路。 控制电路具有耦合到电容器的电压输入和耦合到开关电路的控制输入的输出，并且包括具有较低阈值和较高阈值的迟滞的比较器。 上限阈值和下限阈值之间的差异被选择为与产品与两个电流值之和的比例基本上成比例，使得振荡频率和占空比不依赖于电源电压，温度和 的过程。
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公开(公告)号：US5481221A
公开(公告)日：1996-01-02
申请号：US197077
申请日：1994-02-16
IPC分类号： G11C11/407 , G11C16/06 , G11C17/00 , H02M3/07 , G05F1/10
CPC分类号： H02M3/07
摘要： A charge pump circuit includes a pair of series switching devices coupled between an output node of the circuit and an input node. A power stage drives a charge transfer capacitor which is coupled to an intermediate node between the series switching devices. The power stage has an input coupled to the input node of the circuit, The power stage further includes a bootstrap capacitor for maintaining a conductive state during an entire half of a cycle of a period of oscillation of a local oscillator. The series switching devices may be driven in phase opposition by either a CMOS invertor or a pair of comparators.
摘要翻译： 电荷泵电路包括耦合在电路的输出节点和输入节点之间的一对串联切换装置。 功率级驱动耦合到串联开关器件之间的中间节点的电荷转移电容器。 功率级具有耦合到电路的输入节点的输入。功率级还包括自举电容器，用于在本地振荡器的振荡周期的整个半周期期间保持导通状态。 串联开关器件可以通过CMOS反相器或一对比较器相位驱动。
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10.发明授权
公开(公告)号：US5422587A
公开(公告)日：1995-06-06
申请号：US180102
申请日：1994-01-11
IPC分类号： H03K17/16 , H03K17/0412 , H03K17/0414 , H03K17/687 , H03K17/695
CPC分类号： H03K17/0414 , H03K17/04123 , H03K17/687
摘要： A drive circuit for a field-effect transistor is disclosed, the field-effect transistor having a drain terminal connected to the positive pole of a voltage supply and a source terminal connected to a load. The drive circuit comprises a first transistor connected between the gate terminal of the field-effect transistor and the negative pole of the voltage supply for turning off the field-effect transistor. The first transistor is driven by an operational amplifier which has inverting and non-inverting teminals connected to the gate and source terminals of the field-effect transistor, respectively. Switches alternatively intercouple the field-effect transistor to either another voltage supply or the first transistor.
摘要翻译： 公开了一种用于场效应晶体管的驱动电路，场效应晶体管具有连接到电压源的正极的漏极端子和连接到负载的源极端子。 驱动电路包括连接在场效应晶体管的栅极端子和用于截止场效应晶体管的电压源的负极之间的第一晶体管。 第一晶体管由运算放大器驱动，运算放大器分别具有连接到场效应晶体管的栅极和源极端子的反相和非反相温度。 开关将场效应晶体管交替地耦合到另一个电压源或第一晶体管。
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