Wideband translinear current convertor

A bipolar current-to-current convertor (CCCS) using a PNP-NPN translinear loop and two current mirrors is described. This convertor has a virtual earth input, and may be used to realise voltage-current conversion (VCCS). This convertor configuration enables us to obtain a wideband frequency response. The characteristics of a practical current source are presented.     

关于本质安全Boost变换器的探讨

分析Boost变换器工作于连续导电模式（CCM）和不连续导电模式（DCM）时的电感电流,指出当输入电压为最低。负载电阻为最小时,且变换器工作在CCM下的最大电感电流就是该变换器在整个工作范围的最大电感电流。并将其与最小点燃电流相比较作为变换器内部本质安全的判断依据。实验结果验证了理论分析的正确性。     

Ultra-low-distortion current-conversion technique

The generalised schemes of two different current-current convertor circuits (CCCS) each using a translinear input cell and two current mirrors are given. The distortion figures of these networks are presented and discussed for transfer current ratio values of unity.     

智能后备电源供电系统的研究与设计

针对双AC/DC变换器的热备份和冷备份连接方式存在的可靠性较低等问题,提出了智能双AC/DC变换器供电系统的两种新设计方案——数字逻辑控制电路和微控制器控制系统,实现了冷备份电源的自动切换,增强了电源的可靠性,较好地解决了直流电源持续供电的问题,其中的微控制器控制系统设计方案已成功应用于实际的网络传输设备中。     

ECL-CMOS and CMOS-ECL interface in 1.2-μm CMOS for 150-MHzdigital ECL data transmission systems

The design of a full-CMOS circuit that converts voltage signals from those used for emitter-coupled logic (ECL) to CMOS and vice versa, for use in digital data transmissions with clock frequencies up to 150 MHz, is described. Extremely high performances are obtained due to a novel circuit principle, in both the ECL-to-CMOS convertor and the CMOS-to-ECL convertor. A wideband CMOS amplifier used in the ECL-to-CMOS convertor, incorporating a current injection technique to increase the bandwidth of the circuit, is also presented. A circuit principle is presented to realize an extremely fast CMOS-to-ECL conversion, based on a current switching technique and charge injection to compensate the large output capacitance. Both circuits make use of replica biasing to ensure maximum switching speed in the ECL-to-CMOS convertor and correct ECL output levels in the CMOS-to-ECL convertor. An ECL-CMOS-ECL repeater has been designed in a 1.2-μm double-metal CMOS process     

Current-zero detection in thyristor convertors

A method of detecting current zeros in thyristor convertors is described. The method utilises an optically coupled isolator to sense the voltage across each of the thyristors in the convertor, thereby detecting the conduction state of each device. This information is then processed by simple logic to detect current zeros from the convertor.     

Floating-impedance convertors using current conveyors

A floating-negative-impedance convertor and a generalised impedance convertor are described. The circuits use a practical realisation of the CCII+ type current conveyor, the design being based on a differential input/output transadmittance cell.     

一种车载DC/DC变换器的研制

由于车载DC/DC变换器的特殊应用环境,要求其具有小体积、大功率、高效率、高抗震的特点。文章研究了一种车载DC/DC变换器,该变换器采用全桥移相ZVS PWM控制和倍流整流技术,能较好地满足车载大功率DC/DC变换器的各种性能指标。文中分析了该变换器的工作原理,给出了实验结果和波形。     

Wide-range temperature/frequency convertor

A novel wide range temperature/frequency convertor, based on comparing the current through a thermistor and the capacitor discharging current, is described. The input/output relationship is linear over a wide temperature range. The performance fitting has to be done only at the maximum temperature of the range. The convertor can be made multirange by simple modification of the circuit.     

几种双馈式变速恒频风电机组低电压穿越技术对比分析

新电网运行规则要求风力发电机组在电网故障出现电压跌落的情况下不脱网运行,并在故障切除后能尽·陕帮助电力系统恢复稳定运行,要求风电机组具有一定低电压穿越能力。由于双馈感应发电机（DFIG）励磁变换器容量有限,电网故障时会产生转子过电流和变换器直流环节过电压,须实行保护和控制。本文对国内外学术界和工程界对电网故障时双馈感应发电机的保护原理与控制策略进行了大量研究。以便具体设计时根据要求合理选择。     

Improved digital/analogue conversion technique using currentsplitting in lateral bipolar transistors

Describes the use of multiple collector lateral bipolar transistors as precision current splitting elements suitable for use in high resolution monolithic D/A convertor design. Multiple collector structures result in better overall linearity and smaller chip area than previously suggested techniques. A six-bit convertor implemented on a linear bipolar semicustom array is used to demonstrate the advantages of this technique     

Algorithmic analogue-to-quaternary convertor circuit using current-mode CMOS

A new current-mode CMOS algorithmic analogue-to-quaternary data convertor circuit has been realised in a standard polysilicon-gate CMOS technology. This circuit accepts an analogue current input and develops a set of quaternary, base-four, output currents. A single type of convertor cell may be cascaded to the desired number of quaternary output digits. The reference current that defines the full scale input range may be set externally. This circuit is input-output compatible with other previously described VLSI-compatible current-mode CMOS quaternary threshold logic and memory circuits.<>     

Circuit technique for wide-range, linear, voltage-to-current convertors

A `current-balancing? circuit technique, involving the use of an emitter-follower and two complementary current mirrors, facilitates the design of a voltage-to-current convertor in which the input voltage control range extends down to within a few tens of millivolts of earth potential despite the use of a single system rail supply.     

A dual differential bilateral current convertor

A simple differential input current convertor technique is described. The circuit offers separate input ports for differential voltage and current inputs, while generating a bilateral current output with minimum offset. High common-mode rejection is achieved without any critical component matching.     

Universal operational-amplifier convertor technique using supply-current sensing

A generalised differential convertor scheme using current mirrors, as o.a. supply-current sensors, and gain-programming resistors, is described. Results for one specific arrangement, a voltage-controlled current source, are presented and discussed.     

CMOS pipelined A/D convertor using current divider

A novel dynamic current divider based CMOS pipelined A/D convertor principle is presented. A basic successive approximation scheme is applied, thus the signal is not modified (i.e. successively multiplied by two) along the A/D conversion. Consequently the most important speed limitation is lower than the time for signals to settle within 1/2 LSB in multiplying schemes.<>     

基于预测电流控制的三电平并网变流器研究

概述并网用网侧变流器工作原理,分析其工作模式,探讨了基于只与开关频率相关的预测电流控制（PCFF）和电网电压前馈相结合的控制策略,该策略能够弥补三电平变流器直流侧电容电压不平衡的先天性缺陷,而且PCFF控制下的系统有快速的动态响应,特别易于数字化实现。构建仿真模型分析验证了控制策略的有效性和可行性。     

High-resolution, current-mode A/D convertors using active currentmirrors

An improved current-mode algorithmic A/D convertor (ADC), using active current mirrors, is described. These mirrors eliminate current mismatches due to the transistor's finite output resistance, allowing the construction of higher-resolution ADCs than is possible using simple current mirrors     

New optimal predictive current mode control technique for bilevel quantum series resonant convertors

A new optimal predictive current mode control technique is proposed to improve the performance of a bilevel quantum series resonant convertor. With this technique, the fast transient response with negligible overshoot and the minimised current ripple with reduced offset current can be available.<>     

Precision differential voltage?current convertor

A new differential voltage?current convertor is proposed, which achieves high linearity and is substantially temperature independent. The effects of transistor mismatches and of limited current gain are analysed. Experimental results are given which show a considerable improvement over previous circuits.