Johnny Houston Anderson;John McCune Anderson;Allister R. McIntyre
发明人:
Allister R. McIntyre,John McCune Anderson,Johnny Houston Anderson
申请号：
US12299362
公开号：
US08209007B2
申请日:
2007.05.01
申请国别(地区):
US
年份:
2012
代理人:
摘要：
An H-bridge switching circuit for an automated external defibrillator comprises an SCR (D8) in one of the high legs of the circuit and a control means (D1-D7) associated with the SCR which is operative to switch the SCR on automatically in response to a voltage change across the SCR corresponding to the switching device in the diagonally opposite leg of the H-bridge turning on. The control means comprises a capacitor (D1) and the voltage on the capacitor changes when the diagonally opposite switching device turns on, the change in capacitor voltage lagging the change in voltage across the SCR and the SCR being turned on when the difference between the capacitor voltage and the voltage across the SCR exceeds a predetermined threshold.
