An inverter circuit for reducing runaway current due to applied voltage stress and temperature conditions comprises: first and second field effect transistor (FET) devices of opposite device polarities for driving a connected second stage device having a connected 2.sup.nd stage first and second FET devices, each 2.sup.nd stage device having a respective input gate terminal. The first FET and second FET devices have a respective output drive terminal, a first conductive structure connects the first FET output drive terminal to the input gate terminal of each the first and second connected FET device and further connects the first FET output drive terminal to the second FET output drive terminal through a ballasting resistor device. A second separate conductive structure connects the second FET output drive terminal to the input gate terminals and includes a path further connecting the second FET output drive terminal to the first FET output drive terminal through the ballasting resistor device.

A switchable voltage regulation circuit includes a power supply chip and a voltage regulation module. The voltage regulation module includes first and second resistors and first and second switch units. A first terminal of the first resistor is electrically coupled to a power supply and a first output pin of the power supply chip. A first terminal of the second resistor is electrically coupled to the second terminal of the first resistor. The first switch unit is electrically coupled between the first terminal of the first resistor and the second terminal of the first resistor. The second switch unit is electrically coupled between the first terminal of the second resistor and the voltage output. By manual switching, or by transistors under control of a baseboard management unit, the resistances can be switched in or switched out to regulate the voltage.

A power supply apparatus includes a power device, an I/V conversion circuit, a data converter, a controller, and sink-side current sources. The power device supplies current from a driving power supply to a load. The I/V conversion circuit detects a converted voltage generated by current passing through a detection resistor. The data converter converts the converted voltage into a data value based on a predetermined characteristic. The controller stops the power device from supplying the current to the load, on a condition that a calculated value derived from the data value exceeds a threshold value. The sink-side current sources, in multiple stages, superimpose an offset value on the current passing through the detection resistor.

A power supply apparatus includes a power device, an I/V conversion circuit, a data converter, a controller, and sink-side current sources. The power device supplies current from a driving power supply to a load. The I/V conversion circuit detects a converted voltage generated by current passing through a detection resistor. The data converter converts the converted voltage into a data value based on a predetermined characteristic. The controller stops the power device from supplying the current to the load, on a condition that a calculated value derived from the data value exceeds a threshold value. The sink-side current sources, in multiple stages, superimpose an offset value on the current passing through the detection resistor.