具有自驱动有源缓冲器的GaN基高效准谐振反激式功率变换器

提出了一种具有自驱动有源缓冲器的GaN基高效准谐振(QR)反激式功率变换器,以解决准谐振反激式功率变换器中开关管关断时电压过高的问题。电路以GaN高电子迁移率晶体管(HEMT)器件为主开关管和同步整流器开关管,自驱动有源缓冲器由钳位电容和有源开关管组成。该变换器在主开关管关断期间将开关管的电压浪涌钳位为恒定电压,由于有源开关管驱动信号由变压器的次级侧电流控制,因此不需要单独的控制电路。为验证所提出的变换器和控制电路的有效性,搭建了一个60 W的AC-DC功率变换器,测试结果表明,主开关管的最大电压浪涌约为450 V,具有高达91.6%的能量转换效率。     

电子镇流器中半桥逆变器与谐振电路的频率匹配

荧光灯与高频电子镇流器的非阻抗匹配性质,导致在负载灯管一端要引入电感电容,以便与电子镇流器阻抗匹配。电子镇流器的设计中,电子镇流器的振荡频率与串联谐振电路的振荡频率必须匹配,否则会引起开关管工作波形异常,开关管也会有更大功率损耗,降低能效,甚至损坏半桥电路开关管器件本身。     

TL镇流器电子驱动器VK06TL的应用

VK06TL是ST公司生产的带有控制电路和复合功率开关的TL电子镇流器驱动器。用该器件设计电子镇流器时，其灯预热频率、稳态工作频率及灯寿终定时保护等一些参数均可通过外部元件来设定。文中介绍了VK06TL的结构与特点，给出了其工作原理和典型应用电路。     

IR215×在荧光灯电子镇流器中的应用

<正> 目前国内生产的荧光灯电子镇流器绝大多数采用驱动变压器式的半桥拓扑结构来驱动功率MOSFET,两只功率MOS-FET管在驱动变压器的作用下交替导通给灯管提供电流,开关频率由LC共振频率决定。这种电路存在着以下缺点:(1)电路本身不能自启动,通常要在低侧功率MOSFET管栅极加上双向触发二极管才能在电路接通瞬间触发低侧功率MOSFET管;(2)驱动变压器限制了电子镇流器的小型化;(3)驱动变压器的生产成本高。 采用IR215×系列控制集成电路取代传统的变压器驱动方式可克服上述缺点。IR215×系列芯片为高压、高速功率MOSFET或IGBT驱动集成电路,可驱动高侧和低侧MOSFET或IGBT,能够提供高达600V的直流偏置电压,具有自振荡或     

一种性能优良的电子镇流器

<正> 笔者通过对多种市售成品电子镇流器电路的剖析和反复实验对比,设计出一种性能稳定、工作可靠、性价比高的电子镇流器电路,它不仅适合电子爱好者自制,也可供生产厂家借鉴参考。 工作原理 图1示出了电子镇流器的电原理图,为便于说明原理,图1中绘出虚线框内的日光灯管接线。二极管D1～D7和电容C2、C3等构成交流电整流滤波电路,向镇流器电路提供直流用电。开关功率三极管BG1、BG2和双向触发二极管ST、单孔磁环变压器T等构成高频振荡开关波(方波)产生电路,其中R1、C4和ST组成锯齿波发生器,用于启动振荡电路。方波振荡电路将直流电变为高频交流电,用于点燃日光灯管。由于BG1、BG2工作在开关状态,故可获得极高效率。电感L2和C8、C9等构成串联谐振电路,其作用是起辉日光灯管和限制灯管工作电流。     

一种基于STC12C5410AD单片机控制的恒功率金卤灯电子镇流器

介绍了一种基于单片机控制的恒功率金卤灯电子镇流器的设计方案。详细分析了镇流器电路的拓扑结构,并根据金卤灯的启动特性,分析了金卤灯的控制策略,给出了具体的软件流程图以及70W金卤灯电子镇流器的相应硬件控制电路。     

基于半桥双Buck功率变换器的电子镇流器

低频方波驱动模式是目前小功率金属卤化物灯电子镇流器抑制声谐振最有效的方法。本文提出了半桥双降压(Buck)型准方波谐振功率变换器,使所有的半导体开关器件都可以在零电压的条件下开通。并将其应用到70W金属卤化物灯电子镇流器中,达到了金属卤化物灯正常工作的要求。     

基于晶体开关管的双路控制驱动电路设计

开关管驱动电路已经广泛应用于快速开关动作的三极管的各种电子电路中,可提高电路可靠性,改善电路性能。驱动控制电路。它实际是一个通过控制信号对输入信号进行功率放大的电路,满足负载额定功率使得负载正常工作,可以对一定的输入信号进行驱动控制,虽然不同负载需要不     

数字控制金卤灯电子镇流器样机设计

本文基于金卤灯电子镇流器数字控制策略分析的基础上,对其电路拓扑的主电路和控制电路进行设计,即对PFC、DC/DC、DC/AC三级结构的主电路及控制电路模型和参数进行选择、设计,并研制了一台高功率因数低频方波输出的数字控制金卤灯电子镇流器,通过对实验结果分析验证了所提出的数字控制方案是可行的。     

L6599控制的半桥LLC谐振变换器设计与实现

LLC谐振变换器非常适合应用于高效率和高功率密度的场合,成为目前新型谐振变换器的典型代表。文章首先简要介绍了半桥LLC谐振变换器的工作原理和优点,然后计算了主电路和控制电路的主要参数,并根据参数计算结果选择电力电子元器件,最后研制并完善了实验样机。样机实现了变压器漏感充当谐振电感与变压器励磁电感和谐振电容谐振,主开关管实现ZVS,控制电路实现单管自举驱动,验证了文章的正确性和可行性。文章为后续研究奠定了理论和实验基础。     

A Novel Single-Switch Single-Stage Electronic Ballast

A single-stage single-switch high- frequency electronic ballast topology is presented. The circuit topology is the integration of a buck power- factor-correction （PFC） converter and a class E resonant inverter with only one active power switch. The buck converter is operated in discontinuous conduction mode and at a fixed switching frequency, and constant duty cycle to achieve high power factor and it can be controlled easily. Detailed analysis of the operation and characteristics of the circuit is provided. Simulation results satisfy present standard requirements.     

Single-stage electronic ballast with high-power factor

This article proposes a single-stage electronic ballast circuit with high-power factor. The proposed circuit was derived by sharing the switches of the power factor correction (PFC) and the half-bridge LCC resonant inverter. This integration of switches forms the proposed single-stage electronic ballast, which provides an almost unity power factor and a ripple-free input current by using a coupled inductor without increasing the voltage stress. In addition, it realises zero-voltage-switching (ZVS) by employing the self-oscillation technique. The saturable transformer constituting the self-oscillating drive limits the lamp current and dominates the switching frequency of the ballast. Therefore, the proposed single-stage ballast has the advantage of high-power factor, high efficiency, low cost and high reliability. Steady-state analysis of the PFC and the half-bridge LCC resonant inverter are described. The results of experiments performed using a 30 W fluorescent lamp are also presented to confirm the performance of the proposed ballast.     

High power factor self-power-controlling electronic ballast usingcurrent source type push-pull resonant inverter

A new simple low cost high power factor correction circuit for electronic ballast employing a current source type push-pull resonant inverter is proposed. The proposed circuit provides high power factor, low current harmonic distortion, self-power-controlling operation for load variations and cost-effectiveness     

Power factor correction circuit for low-cost electronic ballastusing current-source type push-pull resonant inverter

A new low-cost high power factor correction circuit for electronic ballast employing current-source type push-pull resonant inverter (CS-PPRI) is proposed. The proposed circuit provides good power factor correction, low current harmonic distortion and cost-effectiveness. The prototype meets the IEC555-2 requirements satisfactorily     

Digital Control of a Low-Frequency Square-Wave Electronic Ballast With Resonant Ignition

This paper proposes a two-stage low-frequency square-wave (LFSW) electronic ballast with digital control. The first stage of the ballast is a power factor correction (PFC) stage, and the second is a full-bridge (FB) converter used for both lamp ignition and LFSW drive. As a novelty for LFSW ballasts, ignition is achieved without an additional igniter circuit by operating the FB during start-up as a high-frequency resonant inverter. After ignition, the converter operates as an LFSW inverter to avoid exciting acoustic resonances by controlling the FB as a buck converter and regulating alternately positive or negative current to the lamp. Lamp power is regulated by adjusting the average current supplied by the PFC stage. Another contribution of this paper is to utilize digital control as a simple solution to achieve multimode control, including resonant lamp ignition, LFSW transitions, and lamp current and power regulation.      

Design and analysis of an IC-less self-oscillating series resonant inverter for dimmable electronic ballasts

This paper presents a low-cost solution of converting the popularly adopted nondimmable electronic ballast circuit for fluorescent lamps with self-oscillating series resonant inverter into a dimmable one. The dimming function is achieved by increasing the switching frequency of the inverter from the natural frequency of the resonant tank, so that less energy is coupled to the lamp. Control of the switching frequency is based on deriving an adjustable dc current source from the resonant inductor in the resonant tank to control the operating point of the saturable transformers for driving the switches in the inverter. The overall implementation does not require any integrated circuit. A 17-W prototype has been built and studied. Theoretical predictions have been verified with experimental results. The lamp can be dimmed down to 10% of the full power.     

A single-stage high-power-factor electronic ballast withduty-ratio-controlled series resonant inverter

A single-stage high-power-factor electronic ballast is developed by making an integration of an active filter and a series resonant inverter. The function of power-factor correction is performed by adjusting the duty ratio of the inverter power switches with a simple control circuit. A prototype unit designed for a 36-W compact fluorescent lamp is built and tested to verify the predicted results     

Acoustic-Resonance-Free High-Frequency Electronic Ballast for Metal Halide Lamps

To avoid the acoustic resonance on operating metal halide lamps, an autofrequency-searching method is implemented on the high-frequency electronic ballast. The proposed method allows the use of a high-frequency electronic ballast, making the ballast able to adjust the operating frequency automatically as soon as the acoustic resonance is detected and, consequently, to locate it at a stable frequency. The electronic ballast achieves a high efficiency and a high power density through the employment of a high-frequency resonant inverter with an embedded buck-boost converter for power-factor correction and lamp power regulation. The control strategy is realized by a microprocessor along with the acoustic-resonance detection circuit. The operation of autofrequency searching is illustrated by the experiments on an electronic ballast designed for 70-W metal halide lamps.      

Analysis of the class E amplifier used as electronic ballast with dimming capability for photovoltaic applications

The analysis and design of a dimmable electronic ballast based on the class E amplifier and fed from solar cells with 12V backup batteries is described. The class E amplifier uses a capacitive impedance inverter as resonant tank and one diode antiparallel with the switch; these elements allow implementation of a dimming feature for the ballast and ignition of the lamp while maintaining zero voltage commutations in the switch. The designed electronic ballast drives a 21W lamp and operates at a switching frequency of 370kHz. Dimming is implemented using an SG3524 in a voltage-controlled oscillator fashion.     

A Novel Constant Power Control Circuit for HID Electronic Ballast

This paper presents a constant power control circuit for a three-stage high-intensity discharge (HID) electronic ballast. The three-stage electronic ballast is composed of a boost pre-regulator to achieve a high power factor, a DC/DC buck converter to regulate lamp current with constant lamp power, and a full-bridge inverter to drive the HID lamp with a low-frequency ac squarewave current. The buck converter operating in current mode utilizes current sense level-shift technique to achieve constant power output. The proposed constant power control circuit is easily designed and implemented for the three-stage HID electronic ballast. Finally, a laboratory prototype of a 70 W HID electronic ballast is implemented. The measured results show that the proposed ballast can be applied for various HID lamps with low lamp power variation (less than 0.6%).