| 摘要 |
An external defibrillator having an output circuit that allows a defibrillation pulse to be discharged to a patient is provided. The output circuit, charging circuit, preamplifier circuit, impedance measurement circuit, energy storage device, battery, and measurement and control circuits of the defibrillator are all referenced to a common ground. The use of a common ground is simpler and less expensive than previous designs which utilized isolation stages and circuits for isolating the high and low voltage circuitry. The output circuit is in the form of an H-bridge which contains three SCR legs and one IGBT leg. Each of the legs contains a single semiconductor switch. The IGBT is placed in the northwest leg of the H-bridge. The two lower legs each contain SCRs, one or both of which may be driven by DC gate drive signals.
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