A power regulator includes an input capacitor connected between a first voltage bus and an intermediate point, an output capacitor connected between a second voltage bus and the intermediate point, a plurality of switches and an inductor connected between the input capacitor and the output capacitor, wherein a source of one switch of the plurality of switches is connected to the intermediate point and a protection device connected between the intermediate point and a third voltage bus.

Provided is a backflow prevention circuit including a backflow prevention transistor as a p-channel MOS transistor interposed in series between an input terminal to which a power supply voltage is supplied, and an output-stage transistor as a p-channel MOS transistor, configured to supply an output voltage from an output terminal, and a backflow prevention control circuit configured to turn off the backflow prevention transistor if the output voltage exceeds the power supply voltage. The backflow prevention control circuit includes a first transistor, a first current source circuit, and a level shift circuit.

A new infrastructure for mobile devices and electronic loose equipment, preferably an aircraft infrastructure, is designed to be deployed for both new production aircraft and the after-market installed base for all parts of the aircraft that have human interaction, such as the galley, cockpit or cabin. The architecture is designed around two main objectives: creating stylized and functional products with flexibility in design and providing reliability and maintainability for operators while integrating power and charging mediums to those devices. This architecture is composed of several elements that as a whole complete our new architecture for mobile devices and electronic loose equipment design.

A voltage converting circuit and a control circuit thereof are provided. The control circuit includes a comparator, a clock generator, and a boost circuit. The comparator compares an input voltage with an output voltage to generate a comparison signal. The clock generator generates a clock signal according to the comparison signal to enable the clock signal to have a first frequency in a first time interval and to have a second frequency in a second time interval. The first frequency is higher than the second frequency. The first time interval occurs before the second time interval. The boost circuit receives the clock signal, pulls up a control signal of a driving switch in the first time interval according to a first driving capability, and generates the control signal in the second time interval according to a second driving capability. The first driving capability is greater than the second driving capability.

A DC power supply may use an input supply surge protection circuit that may be robust against positive and negative power surges. DC power may be provided through a first unidirectional circuit component such as a diode or selectively controlled MOSFET coupled in parallel with a transient voltage suppressor or Zener diode. The first unidirectional circuit component may have a first voltage rating and the transient voltage suppressor or Zener diode may have a second voltage rating lower than the first voltage rating. This may allow current to flow backward over the transient voltage suppressor or Zener diode to protect the first unidirectional circuit component from exposure to voltage beyond the first voltage rating in a power surge.

An input/output (I/O) interface includes a resistance-to-current (R/I) converter; an internal resistor; first, second, and third current sources; first and second diodes; and a comparator. The R/I converter is coupled to an I/O pin and generates an output current based on an external resistance at the I/O pin during an analog operating mode. The internal resistor is coupled to the I/O pin and to ground. The first current source is coupled to the R/I converter circuit. The first diode is coupled to the R/I converter and to the I/O pin. The second current source is coupled to the R/I converter and the first diode and to ground. The second diode is coupled to the I/O pin and to the third current source. The comparator has inputs coupled to the I/O pin and to a reference voltage, and outputs a control signal indicative of a digital operating mode.

A power regulator comprises a first power switch configured to carry a pulsed current, an input capacitor between a positive terminal of an input voltage bus and a return point, an output capacitor between a positive terminal of an output voltage bus and the return point and a protection device coupled between the return point and a common return point of the input voltage bus and the output voltage bus, wherein the pulsed current is configured to flow through the protection device.

A new infrastructure for mobile devices and electronic loose equipment, preferably an aircraft infrastructure, is designed to be deployed for both new production aircraft and the after-market installed base for all parts of the aircraft that have human interaction, such as the galley, cockpit or cabin. The architecture is designed around two main objectives: creating stylized and functional products with flexibility in design and providing reliability and maintainability for operators while integrating power and charging mediums to those devices. This architecture is composed of several elements that as a whole complete our new architecture for mobile devices and electronic loose equipment design.

An apparatus is provided which comprises: a protection circuitry coupled between: a node and a first circuitry that is to selectively output a first voltage, the node coupled to a second circuitry that is to selectively output a second voltage, the protection circuitry comprising: a pair of complementary parallel transistors coupled between the node and the first circuitry, the pair comprising first and second transistors, wherein a gate of the first transistor is to receive a control signal at the first voltage, and a third transistor to selectively couple a gate of the second transistor to the node, a gate of the third transistor to receive the control signal at the first voltage.

A transformer assembly comprises at least one transformer having a core. A primary winding is positioned on a first portion, a secondary winding is positioned on a second portion of the core. A neutral winding may be positioned on a third portion of the core. The secondary winding may receive an induced flux produced by an earth surface potential (ESP) via a system ground and/or receive an induced zero sequence flux produced by a non-linear load. The neutral winding may be configured to provide a mitigating flux to the secondary winding. The transformer may also be used as a filter for either GIC or triplen harmonic mitigation. In this case, the primary windings receive the zero sequence current (GIC or triplen harmonics) and the flux may be cancelled in neutral winding such that the zero sequence currents circulate between the zero sequence source and the filter transformer.