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公开(公告)号：US5264781A
公开(公告)日：1993-11-23
申请号：US846139
申请日：1992-03-05
Applicant: John M. Miller , Harold G. Spring
Inventor： John M. Miller , Harold G. Spring
Abstract: An analog circuit provides selectable current control and power limiting for a connected load. A current control loop is combined with a voltage/power control loop to generate a current level signal via an output transistor to control current flow through a load. Current through a load is monitored with the current control loop maintaining current flow through the load at a selected value. If a selected power level is exceeded, the current is reduced by the voltage/power control loop. Voltage monitoring and feedback is used to control the operating power for a power level control operational amplifier and thereby maintain a selected power level. By providing multiple, voltage dependent gains in the voltage feedback loop, a piecewise linear approximation of a desired power curve can be obtained.
Abstract translation: 模拟电路为连接的负载提供可选择的电流控制和功率限制。 电流控制回路与电压/功率控制回路组合以经由输出晶体管产生电流电平信号，以控制通过负载的电流。 通过负载监视电流，电流控制回路将保持电流通过负载在选定的值。 如果超过选定的功率电平，则电流/电源控制回路减小电流。 电压监控和反馈用于控制功率电平控制运算放大器的工作功率，从而保持所选择的功率电平。 通过在电压反馈回路中提供多个与电压相关的增益，可以获得期望功率曲线的分段线性近似。
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公开(公告)号：US5039934A
公开(公告)日：1991-08-13
申请号：US527018
申请日：1990-05-22
Applicant: John G. Banaska
Inventor： John G. Banaska
Abstract: An apparatus capable of acting as a current-limited voltage source or a voltage-limited current source is disclosed. The output of the apparatus is provided by a differential amplifier. The current and voltage outputs are compared to positive and negative current and voltage limits. Depending on whether the apparatus is in the voltage mode or the current mode, the inverting input of the differential amplifier is clamped to the appropriate voltage or current comparison signal, respectively, to provide an error signal to the differential amplifier. This clamping is current limited so that if the output current limits are exceeded while in the voltage source mode, a clamp to one of the current comparison signals occurs and dominates the voltage clamp. Similarly, if the output voltage limits are exceeded while in the current source mode, a clamp to one of the voltage comparison signals occurs and dominates the current clamp. To enable a voltage or current source limit to be set at zero, the opposite polarity limit is offset slightly to avoid contention should it also be set near zero.
Abstract translation: 公开了一种能够用作限流电压源或限压电流源的装置。 该装置的输出由差分放大器提供。 将电流和电压输出与正和负电流和电压限制进行比较。 根据设备是否处于电压模式或当前模式，差分放大器的反相输入分别被钳位到适当的电压或电流比较信号，以向差分放大器提供误差信号。 这种钳位电流受限制，因此如果在电压源模式下超过输出电流限制，就会产生钳位到当前比较信号中的一个并支配电压钳位。 类似地，如果在电流源模式下超过输出电压限制，就会产生钳位到一个电压比较信号并支配电流钳位。 为了使电压或电流源极限被设置为零，相反的极性极限将略微偏移，以避免竞争，如果也应设置为接近零。
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公开(公告)号：US4926288A
公开(公告)日：1990-05-15
申请号：US175957
申请日：1988-03-31
Applicant: Donald A. Bradley
Inventor： Donald A. Bradley
Abstract: An electronic circuit is provided for protecting an electronic system and its power supply from damages caused by an over-current condition. The circuit automatically enters into a first state upon application of power from the power supply. In this first state, current is allowed to pass from the power supply through a channel to the electronic system. Upon detecting an over-current condition, a positive feedback will cause the circuit to enter into a second state, wherein the channel is cutoff.
Abstract translation: 提供电子电路，用于保护电子系统及其电源不受过电流状况的损害。 在从电源供电时，电路自动进入第一状态。 在该第一状态下，允许电流从电源通过通道传送到电子系统。 在检测到过电流状态时，正反馈将导致电路进入第二状态，其中通道被切断。
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公开(公告)号：US4835649A
公开(公告)日：1989-05-30
申请号：US132759
申请日：1987-12-14
Applicant: David C. Salerno
Inventor： David C. Salerno
Abstract: A resettable current limiter is started using an externally generated reset signal, latches on and continues conducting until an overload current is sensed, at which time the limiter shuts off load current. An FET is used both as a series pass element anda load current sensing element. A comparator senses the source of drain voltage drop across the FET and provides a shutdown signal to the FET's gate upon sensing an overload. The limiter may also comprise a solid state switch for positively shutting off the FET using an externally generated off signal. The reset signal reponse circuitry may be set up to be edge triggered to protect against an external short. The reset signal may be a level change or may be a periodic signal. A zener diode may be used for both protecting the FET against excessive voltages and against current surges.
Abstract translation: 使用外部产生的复位信号启动可复位限流器，锁存并继续导通，直到感测到过载电流，此时限制器关闭负载电流。 FET既用作串联通过元件又用作负载电流检测元件。 比较器感测FET上的漏极电压降的源，并在感测到过载时向FET的栅极提供关断信号。 限幅器还可以包括一个固态开关，用于使用外部产生的关闭信号来正确关闭FET。 复位信号响应电路可以被设置为边缘触发以防止外部短路。 复位信号可以是电平变化，也可以是周期信号。 可以使用齐纳二极管来保护FET免受过电压和电流浪涌。
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公开(公告)号：US4669026A
公开(公告)日：1987-05-26
申请号：US773693
申请日：1985-09-09
Applicant: Robert J. Widlar
Inventor： Robert J. Widlar
Abstract: A thermal shutdown circuit for use with a high power transistor which incorporates a sense emitter. A differential amplifier is driven from the transistor base and the sense emitter and has an output that is coupled to the power transistor base. When the sense emitter potential exceeds the base potential, the amplifier output will pull the base down so as to limit the current in the power transistor. For a silicon transistor, the circuit will act to limit the hottest portion of the sense emitter to a maximum of about 250.degree. C. When there are no hot spots and the sense emitter is heated uniformly, heating of the transistor will be limited to about 200.degree. C.
Abstract translation: 一种用于与功率晶体管结合使用的热关断电路。 差分放大器由晶体管基极和感测发射极驱动，并具有耦合到功率晶体管基极的输出端。 当感测发射极电位超过基极电位时，放大器输出端将向下拉，以限制功率晶体管中的电流。 对于硅晶体管，电路将用于将感测发射极的最热部分限制在最大约250℃。当没有热点并且感测发射极被均匀地加热时，晶体管的加热将被限制在大约 200℃
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Patent Agency Ranking
公开(公告)号：US4078200A
公开(公告)日：1978-03-07
申请号：US775051
申请日：1977-03-07
Applicant: Grant Edgar Ritchie , John Malcolm Morrison
Inventor： Grant Edgar Ritchie , John Malcolm Morrison
Abstract: Currents greater than predetermined amount are prevented within a circuit arrangement by connecting the electrical supply to at least one conductor via a diode and a transistor, with the diode and the base-collector junction of the transistor in series between the conductor and the supply, and with the emitter connected via a resistor to a point maintained at an appropriate reference potential level, the transistor being in a grounded-base configuration, with the maximum possible collector current defined by the maximum possible emitter current.
Abstract translation: 通过将电源通过二极管和晶体管连接到至少一个导体，电极中的电流大于预定量的电流，晶体管的二极管和基极 - 集电极结串联在导体和电源之间，以及 通过一个电阻器将发射极连接到一个保持在适当参考电位电平的点，晶体管处于接地基极配置，最大可能的集电极电流由最大可能的发射极电流限定。
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77.发明授权
公开(公告)号：US3906310A
公开(公告)日：1975-09-16
申请号：US40618873
申请日：1973-10-15
Applicant: SONY CORP
Inventor： ESASHIKA TADASHI
IPC: H03F1/52 , G05F1/56 , G05F1/573 , H01L21/822 , H01L27/02 , H01L27/04 , H02H5/04 , H02H7/20 , H03F1/42 , H03F3/34 , H03F3/347 , H02H3/10
CPC classification number: H02H7/205 , G05F1/573 , H01L27/0211 , H02H5/044
Abstract: A protective circuit for a power or other main transistor in a monolithic integrated circuit is provided which gives protection for any potentially destrucive rise in temperature of such transistor. A temperature sensing Zener diode and one or more normal diodes are located in the same substrate and in position where they are directly subject to any rise in temperature of the main transistor. Through a particular circuit arrangement, the main transistor will be turned off when its temperature rises a predetermined value below its destructive value. This is accomplished by utilizing a circuit in which as the temperature of the Zener diode rises the voltage across the Zener diode rises due to its positive temperature coefficient and voltage across the ordinary diode decreases due to its negative temperature coefficient. The Zener diode and the normal diode are connected in a circuit in which the two diodes, one having a positive coefficient and the other have a negative temperature coefficient, acting together provide a control voltage which modifies the base bias of the main transistor to cut off the main transistor when the temperature of the main transistor reaches a predetermined point, such for example as about 160*C. The protective circuit of the present invention is particular useful in combination with a circuit which provides protection against excessive load current in the output of the main transistor, such as might be caused by a short circuit. It is also useful in combination with a voltage controlled circuit.
Abstract translation: 提供了用于单片集成电路中的功率或其它主晶体管的保护电路，其保护了这种晶体管的任何潜在的破坏性温度上升。 温度感测齐纳二极管和一个或多个正常二极管位于相同的衬底中并且位于它们直接受到主晶体管的任何温度升高的位置。 通过特定的电路布置，当主晶体管的温度升高到低于其破坏性值的预定值时，主晶体管将被关断。 这是通过利用其中随着齐纳二极管的温度升高齐纳二极管的温度升高的电路而实现的，由于其正温度系数和普通二极管上的电压由于其负温度系数而降低。 齐纳二极管和正常二极管连接在一起的电路中，其中两个二极管（一个具有正系数，另一个具有负温度系数）一起起作用，提供控制电压，其修改主晶体管的基极偏压以截止 主晶体管当主晶体管的温度达到预定点时，例如约160℃。
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78.发明授权D. c. static switch circuit with a main switch device and a power sharing circuit portion 失效D. C.主开关器件和电源共享部分的静态开关电路
公开(公告)号：US3793580A
公开(公告)日：1974-02-19
申请号：US3793580D
申请日：1972-05-23
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： BAKER D
Abstract: In a static switch circuit with a power sharing circuit portion operable to dissipate power so the required dissipation is shared with the main power switch in the circuit, the power sharing circuit portion has an NPN transistor and a PNP transistor connected in a white circuit configuration that is provided with bias signals from the center tap of the primary winding of the transformer used in the oscillator of the driver circuit for the main power switch.
Abstract translation: 在具有功率共享电路部分的静态开关电路中，功率分配电路部分可操作以耗散功率，使得所需的耗散与电路中的主电源开关共享，功率共享电路部分具有以白电路配置连接的NPN晶体管和PNP晶体管， 在用于主电源开关的驱动电路的振荡器中使用来自变压器的初级绕组的中心抽头的偏置信号。
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公开(公告)号：US3703680A
公开(公告)日：1972-11-21
申请号：US3703680D
申请日：1971-02-08
Applicant: ASEA AB
Inventor： FRANK KJELL , JOHANSSON LENNART
CPC classification number: H02J3/1892 , G05F1/573 , H02J3/1828 , Y02E40/30
Abstract: A capacitor bank for alternating current networks has a number of parallel branches each of which is connected by antiparallelconnected thyristors to the network. There is a control device for each thyristor which, when the bank is fully loaded, connects the thyristors in one conducting direction or the other in synchronism with the maximum of the network voltage in such direction. Each branch of the bank can be recharged by the full load during each half-period of the network voltage. Upon the occurrence of reduced load on the bank, the control devices emit current pulses to connect the thyristor switches in one direction or the other of the maxima of the network voltage in such direction for recharging. These latter pulses are emitted at a frequency which is substantially less thaN the network frequency.
Abstract translation: 用于交流网络的电容器组具有多个并联支路，每个支路通过反并联连接的晶闸管连接到网络。 每个晶闸管都有一个控制装置，当该组件满载时，在一个导通方向上或另一个导通方向上，以这种方向与网络电压的最大值同步连接晶闸管。 银行的每个分支可以在网络电压的每个半周期内由满载充电。 在存储器上发生负载减小时，控制装置发射电流脉冲，以将该晶闸管开关沿网络电压的最大值的一个方向或另一个方向连接在这样的方向上用于再充电。 这些后面的脉冲以基本上小于网络频率的频率发射。
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公开(公告)号：US3697861A
公开(公告)日：1972-10-10
申请号：US3697861D
申请日：1971-04-29
Applicant: COLLINS RADIO CO
Inventor： FRAZIER MELVIN A
CPC classification number: G05F1/573 , Y10S323/901
Abstract: A series voltage regulator providing both short circuit and overload protection having a transistor in series with a preceding resistor in a direct path from dc input to dc regulated voltage output. The transistor is a series control element part of current limiting circuit subject to control with voltage drop variation through the preceding resistor. The voltage regulator also has automatic self-starting circuitry coupled through to a regulator bias circuit subject to being decoupled when the bias circuit connected to regulated dc output is sustaining operational bias in the regulator during normal operation after regulated dc voltage is developed at the regulator output.
Abstract translation: 提供短路和过载保护的串联稳压器，其具有与直流输入直流稳压电压输出直接路径中的前一个电阻串联的晶体管。 晶体管是限流电路的串联控制元件部分，通过前一电阻器的电压降变化进行控制。 电压调节器还具有耦合到调节器偏置电路的自动自启动电路，当经调节的直流输出的偏置电路在调节器输出中产生稳压直流电压之后，正常运行期间稳压器中的维持运行偏压 。
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