公开(公告)号：US5023518A

公开(公告)日：1991-06-11

申请号：US283255

申请日：1988-12-12

申请人： Wayne K. Mans ,  Vincent J. Rizzo

发明人： Wayne K. Mans ,  Vincent J. Rizzo

IPC分类号： H05B41/285 ,  H05B41/36 ,  H05B41/38 ,  H05B41/44

CPC分类号： H05B41/44 ,  H05B41/2858 ,  H05B41/36 ,  H05B41/38 ,  Y10S315/04 ,  Y10S315/07

摘要： A ballast circuit for a gaseous discharge lamp, particularly a neon light, includes a diode bridge rectifier for producing a d-c voltage from an a-c input and a transformer with a secondary winding connected to the lamp and a primary winding connected to the rectifier. A switching circuit is connected to the transformer primary winding for controlling a flow of current therethrough from the rectifier. The switching circuit includes at least one MOSFET having a drain terminal connected to the transformer primary winding and a grounded source terminal. A control circuit is connected to a gate terminal of the MOSFET for controlling the on and off times thereof, the control circuit including a pulse generator for producing a train of pulse-width-modulated rectangular pulses of substantially a single frequency fed to the MOSFET's gate terminal. The pulse generator includes circuitry for changing the width of the rectangular pulses to enable a gradual energization of the gaseous discharge lamp from one end thereof towards an opposite end to create a writing effect of selectively different speeds in the gaseous discharge lamp. The circuitry in the pulse generator for changing the pulse width can be used to control the widths of the pulses so that the pulses are a train of square waves having a common duration equal to an interpulse period, whereby striations are generated in the gaseous discharge lamp.

摘要翻译： 用于气体放电灯，特别是霓虹灯的镇流器电路包括用于从a-c输入端产生d-c电压的二极管桥式整流器和连接到灯的次级绕组的变压器和连接到整流器的初级绕组。 开关电路连接到变压器初级绕组，用于控制从整流器流过的电流。 开关电路包括至少一个MOSFET，其具有连接到变压器初级绕组的漏极端子和接地的源极端子。 控制电路连接到MOSFET的栅极端子，用于控制其导通和关断时间，该控制电路包括脉冲发生器，用于产生基本上单个频率的脉冲宽度调制的矩阵脉冲序列，馈送到MOSFET的栅极 终奌站。 脉冲发生器包括用于改变矩形脉冲的宽度的电路，以使气态放电灯从其一端向相对端逐渐通电，从而产生在气体放电灯中选择性地不同速度的写入效应。 用于改变脉冲宽度的脉冲发生器中的电路可以用于控制脉冲的宽度，使得脉冲是具有等于脉冲间周期的公共持续时间的一串方波，从而在气体放电灯中产生条纹 。