| 摘要 |
A clamp circuit for the protection of a semiconductor switch. The circuit has particular value in a stored energy inverter. The energy which is not delivered to the secondary winding would normally result in an induced voltage of reversed polarity upon opening the switch connecting the primary winding to the source of electrical energy. This induced voltage adds to the supply voltage to create a high voltage across the switch. Semiconductor switches having limited dissipation ability are protected by connecting an inductance-capacitance resonant circuit across the switch. When the switch is open, the capacitor charges to a voltage of a first polarity. When the switch is closed, a half-cycle of oscillation occurs to reverse the polarity of the capacitor voltage. This stored charge serves to absorb the induced voltage which results from opening the switch, thereby limiting dissipation within the switch during this period.
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