公开(公告)号：WO1998004103A1

公开(公告)日：1998-01-29

申请号：PCT/US1997007554

申请日：1997-05-05

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  LIU, Guang ,  UPADHYAY, Anand, K.

IPC: H05B37/02

CPC classification number: H05B41/2985 ,  Y10S315/07

Abstract: A protection method (10) and protection circuit (500) for protecting an inverter (300) in an electronic preheat ballast (100) for powering fluorescent lamps (900). The protection circuit (500) comprises a frequency shift circuit (600), a latch circuit (700), a current source network (520), a current sensing circuit (510), and a DC supply capacitance (502). The protection method (10) includes the steps of: (a) providing a filament preheat period by initially setting the inverter drive frequency at a first frequency; (b) shifting the drive frequency to a second frequency for igniting and operating the lamps; (c) changing the drive frequency back to the first frequency in response to a lamp fault; and (d) providing, upon correction of the lamp fault, a filament preheat period prior to attempting to ignite and operate the lamps.

Abstract translation: 一种用于保护用于为荧光灯（900）供电的电子预热镇流器（100）中的逆变器（300）的保护方法（10）和保护电路（500）。 保护电路（500）包括频移电路（600），锁存电路（700），电流源网络（520），电流检测电路（510）和直流电源电容（502）。 保护方法（10）包括以下步骤：（a）通过将逆变器驱动频率初始设定为第一频率来提供灯丝预热周期; （b）将驱动频率转换到第二频率以点燃和操作灯; （c）响应于灯故障将驱动频率改变回第一频率; 以及（d）在灯故障的校正之后，在试图点燃和操作灯之前，提供灯丝预热时段。

公开(公告)号：WO1997012308A1

公开(公告)日：1997-04-03

申请号：PCT/US1996011541

申请日：1996-07-11

Applicant: MOTOROLA INC.

Inventor： MOTOROLA INC. ,  KONOPKA, John, G. ,  LABUDDA, Kenneth, D. ,  STEPHENS, Dennis, L. ,  UPADHYAY, Anand, K.

IPC: G05F01/10

CPC classification number: H02M7/062 ,  H02H9/001 ,  H05B41/2856 ,  Y10S323/908

Abstract: An electronic power supply circuit that includes a rectifying circuit (4), a boost converter (6), an in-rush current reduction circuit (8), and a bulk capacitor (10). The in-rush current reduction circuit (8) includes a current limiting resistor (14) and a bypass capacitor (16) that are connected in parallel with each other. An improved version of the in-rush current reduction circuit (8) includes a bypass diode (18) connected in parallel with the current limiting resistor (14) and bypass capacitor (16) and oriented to provide a path for current flowing out of bulk capacitor (10). One particular application of the disclosed circuit is for use in an electronic ballast for fluorescent lamps.

Abstract translation: 一种包括整流电路（4），升压转换器（6），浪涌电流降低电路（8）和大容量电容器（10）的电子电源电路。 浪涌电流降低电路（8）包括彼此并联连接的限流电阻（14）和旁路电容（16）。 浪涌电流降低电路（8）的改进版本包括与限流电阻器（14）和旁路电容器（16）并联连接的旁路二极管（18）并且被定向成提供用于电流流出体的路径 电容器（10）。 所公开的电路的一个具体应用是用于荧光灯的电子镇流器。