The present invention relates to a circuit structure for detecting and rapidly restricting large current increase based on high current injection at an output terminal (out). In particular, a drive circuit (40) through a low resistance element (R0) control, is the current overshoot after the gate controlled switching device (P0) in the control end of its charging by high current injection, the circuit of the invention can choose to drive. Thus, by a positive slope of the steep pulse generated by the voltage increase by capacitance (C) detection and transmitted to the gate terminal (GateN), due to the capacitance (C) through the gate terminal (GateN) slow discharge to a gate controlled switching device (P0) of the gate terminal (GateP) injection from the transistor (P3) was issued by the current crest, the circuit of the invention will drive circuit (40) bypass. The current amplification causes the injected current peak to be accomplished by using a current mirror (P4, P3) with large current reflectivity, and is enhanced by the presence of a diode (D0, D1). In the static mode, or with a negative slope steep pulse generated by the high voltage is reduced by capacitance (C) detection and transmitted to the gate terminal (GateN), transistor (P4) is a diode (D1) current source outflow current becomes short, thus, the current mirror (P4 + P5, P3 the current mirror) is substantially with current reflection coefficient is much lower (P5, P3) to replace the. The results with current source (CS2) low enough current absorbed by the current mirror (P3, P5) of the lower current mirror, and allowing the driver circuit (40) over the switching device (P0) control. Finally, this current structure works in one direction, limiting the large current increase without limiting the large current reduction through the gate controlled switching device (P0).
【技术实现步骤摘要】
【国外来华专利技术】
本专利技术涉及电流限制器电路,尤其涉及能够基于对开关器件的 控制端进行的高电流注入来感应和限制过度电流过冲的高速电路。这 个电路是单向性的,限制电流增加但不限制电流减小。
技术介绍
例如,诸如蜂窝电话、个人数字助理(PDA)、便携个人计算机、 摄像机、数码相机或MP3播放器之类的便携和移动装置在不能获得交 流电源时需要由操作的电池供电。例如,用于这样操作模式的电路由 将电池和装置分离并表现0. 1-0. 5Q范围内低阻性的可控开关器件 组成。由于这个电路还可以作为电池充电电路,因此,它可以在任何 时候在电池对装置进行供电的同一端子处连接到诸如壁式插头适配 器之类的DC电源。在这个时刻,可控开关器件仍然处于低电阻模式, 从而,存在于DC电源(例如,6V)和电池(例如,3.6V)之间的电 压差将导致流经可控开关器件流向电池的电流过冲(例如,典型地 5A: (6V-3. 6V) /0. 5Q或者更大)。虽然该可控开关器件通常由可 以减小该电流(例如,降至1A)的驱动电路控制,然而,这个限制 是基于电流调整的缓慢处理,该电流调整通常花费几微秒时间,这个 时间由检测电流 ...
【技术保护点】
一种可变电流放大器电路结构,用以可变地对电流进行放大,所述可变电流放大器电路结构包括:输入端(in)和输出端(out);检测级,用以检测电压变化,所述电压变化是在第一晶体管(N1)的第一控制端(GateN)被传送的,该第一晶体管控制第一电流,所述电压变化导致所述第一电流的电流变化,所述检测级具有耦接至所述输入端(in)的输入;调整级,用以将在所述第一控制端(GateN)处的偏置电压以及由所述偏置电压控制的所述第一电流分别调整为第一和第二静态值,所述第一静态值是不受所述电压变化影响的电压值,所述第二静态值是不受所述电流变化影响的电流值;可变放大级,用以基于第一电流镜(P3,P ...
【技术特征摘要】
【国外来华专利技术】...
【专利技术属性】
技术研发人员:纪尧姆德克勒穆,
申请(专利权)人:NXP股份有限公司,
类型:发明
国别省市:NL[荷兰]
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