| 摘要 |
An isolation circuit for isolating a load node from a power supply secondary inductor includes a Zener diode and a PTC thermistor. The Zener diode electrically couples the load node to a ground and is capable of being in a substantially conductive state when the voltage between the load node and the ground exceeds a predetermined threshold and is also capable of being in a substantially non-conductive state when the voltage between the load node and the ground does not exceed the predetermined threshold. The Zener diode has a non-conductive temperature corresponding to when the Zener diode is in the substantially non-conductive state and a conductive temperature corresponding to when the Zener diode is in the substantially conductive state. The PTC thermistor electrically couples the power supply secondary inductor to the load. The PTC thermistor is in thermal communication with the Zener diode so that when the temperature of the Zener diode is at the non-conductive temperature the PTC thermistor is in a minimally resistive state and when the Zener diode is at the conductive temperature the PTC thermistor is in a maximally resistive state so as to be substantially non-conductive.
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