An innovative method to achieve minimum tripping current conformity for type A RCCBs

作者：Li, Ailing^*; Han, Yan; Sun, Jun

来源：IEICE Electronics Express, 2015, 12(7): 20141220.

DOI：10.1587/elex.12.20141220

• type A RCCBs
• the discreteness of the minimum tripping current
• reliability

This paper presents an innovative method to decrease the discreteness of minimum tripping current for type A residual current operated circuit breakers (RCCBs). Different but continuous time intervals' detection method is proposed to identify the residual current's type and judge whether its root mean square (RMS) value has exceeded the rated value in one cycle. That is, after the timer is started, 0-3 ms +/- 135 degrees leakage current is detected, 3-7 ms +/- 90 degrees is detected, 7-12 ms +/- 0 degrees is detected, 3-7 ms and 12-16 ms type AC is detected. What's more, the method is fabricated in a mixed-signal 0.5 mu m CMOS process, and test results show that the type A RCCB's tripping current variation is decreased to 2.8 mA, which greatly improves the chip's reliability and anti-interference ability.

• 出版日期2015-4-10
• 单位浙江大学