公开(公告)号：US3893006A

公开(公告)日：1975-07-01

申请号：US43326274

申请日：1974-01-14

Applicant: NORDSON CORP

Inventor： ALGERI HARVEY R ,  BRUENING RALPH G ,  SANDORF ROBERT E ,  STILLWELL FRED A

IPC: B05B5/10 ,  G05F1/569 ,  H02H7/00 ,  H02H7/12 ,  B05B5/02 ,  H02H7/122

CPC classification number: G05F1/569 ,  B05B5/10 ,  H02H7/003 ,  H02H7/12

Abstract: A high voltage electrostatic spray coating power supply which turns-off automatically when an overvoltage and/or overcurrent is detected, thereby reducing electrical shock and ignition hazards when spraying in an explosive atmosphere. Included is an unregulated DC supply, a DC voltage regulator, an inverter, and a multiplier of the capacitor/diode type which applies high DC voltage to an electrostatic spray gun. Ground return current from the multiplier output to a common internal ground lead is monitored and if it exceeds a predetermined selectable maximum is effective, via a turn-off circuit, to a) turn-off the DC regulator and b) short-circuit the regulator output and inverter input to the common ground. This prevents power transfer between the unregulated DC source and the voltage multiplier, as well as discharges electrical energy stored in the regulator smoothing capacitors and in the multiplier transformer. An overvoltage circuit is also included to independently turn-off the power supply when the regulator output voltage exceeds a predetermined maximum.

Abstract translation: 一种高压静电喷涂电源，当检测到过电压和/或过电流时自动关闭，从而在爆炸性环境中喷涂时减少电击和点火危险。 包括一个不稳定的直流电源，一个直流稳压器，一个逆变器，以及一个电容器/二极管类型的乘法器，它将静电喷枪施加高的直流电压。 监控从乘法器输出到公共内部接地引线的接地回路电流，如果超过预定可选择的最大值，则通过关断电路有效，a）关断直流调节器，并且b）使调节器短路 输出和变频器输入到公共地。 这可以防止未调节的直流电源和电压倍增器之间的电力传输，以及放电保存在调节器平滑电容器和乘法器变压器中的电能。 当调节器输出电压超过预定最大值时，还包括过电压电路以独立关断电源。