Patent ID: 9673692
Date: 2017-06-06
CPC Classifications: H02M,H03K

Claim:
1. A power source, comprising: a main power source; a normally on transistor including a first electrode connected to the main power source, a second electrode to provide a power output of the power source, and a control electrode; a driver including a first input, a second input and a control output connected to the control electrode to switch the normally on transistor; a controller including a signal output connected to the first input to deliver a control signal to the driver to switch the normally on transistor between an on state and an off state to provide the power output on the signal electrode during regular operation; and a housekeeping power supply including an auxiliary power output connected to the second input to switch the normally on transistor to the off state and to maintain the normally on transistor in the off state to turn off the power output on the second electrode during irregular operation.