An apparatus comprises one or more metal-oxide-semiconductor field effect transistors, a charge pump, and a driver circuit. The one or more metal-oxide-semiconductor field effect transistors are generally connected in series between a supply voltage and an output terminal. The charge pump may be configured to generate a voltage of sufficient magnitude relative to the supply voltage to switch the one or more metal-oxide-semiconductor field effect transistors into a conductive state. The driver circuit is generally coupled between the charge pump and the one or more metal-oxide-semiconductor field effect transistors. The driver circuit may be configured to drive the one or more metal-oxide-semiconductor field effect transistors to provide at least one of power switching, reverse polarity protection, power switching with reverse polarity protection, or over voltage inhibition.

A compact, decorative and multi-functional portable power charger and cable apparatus includes a portable charger unit with a housing where the housing encloses an internal rechargeable battery unit for connecting to and recharging one or more electronic devices, and a charging cable extending from the charger housing and in operative communication with the rechargeable battery. At least the charger housing is surrounded by an aesthetic feature, which can comprise a tasseled fitting, a puffball, a luggage tag, or a doll or teddy bear to hide the charger unit. Electrical fittings including power connection interfaces for connecting the charger and cable apparatus with at least one electronic device, or an external power source, or both, can be provided on the charging cable and also hidden by the aesthetic feature. The power charger and cable apparatus can be attached to a fashion accessory, such as a purse, a bag, luggage or clothing.

A receptacle circuit is provided that includes a first circuit path that provides reverse current blocking and reverse polarity protection associated with a positive terminal of a first power source that is connected in parallel with a second power source, a second circuit path that bypasses blocking of the first circuit path, a third circuit path that provides reverse polarity protection associated with a negative terminal of the first power source, and a bypass control circuit that controls the first and second circuit paths based on determination of a predetermined condition.

The present invention relates to a battery reverse voltage prevention system, and more particularly, to a battery reverse voltage prevention system, which prevents current of a battery from flowing to a resistor by connecting an additional P-type channel MOSFET to a P-type channel MOSFET gate terminal in the related art in order to prevent opening/closing of a P-type channel MOSFET from being delayed due to a resistor installed to limit capacitance and dark current generated by the P-type channel MOSFET in a battery reverse voltage prevention system in the related art, which includes the P-type channel MOSFET, thereby reducing an opening/closing delay time of the P-type channel MOSFET in the related art.

An inductive load control device includes: an electric path configured to connect an external DC power supply and an inductive load drive unit; an opening and closing unit configured to connect or disconnect the electric path; a voltage detection unit configured to detect a voltage difference between ends of the opening and closing unit; and a failure detection unit configured to detect a failure of the opening and closing unit. The opening and closing unit includes: series-connected first and second switching elements; and a diode connected in series with the first switching element and in parallel with the second switching element such that an anode of the diode is disposed in a direction of the DC power supply. The failure detection unit is configured to detect that the second switching element is in a non-conduction failure, based on the voltage difference.

A protection circuit includes a first PMOS and a first PDMOS receiving input of voltage of a voltage dividing point of voltage input from an external power supply terminal, and a second PMOS and a second PDMOS receiving input of drain output voltage of the first PDMOS. The first PMOS is connected on the external power supply terminal side of the first PDMOS, and the second PMOS is connected on the external power supply terminal side of the second PDMOS. During overvoltage application, the voltage of the voltage dividing point is clamped to the breakdown voltage of a Zener diode, the second PDMOS turns OFF, and supply to an integrated circuit protected from overvoltage is cut off. When the voltage source is connected in reverse, parasitic diodes of the first and second PMOSs are reverse-biased and the flow of current in a path through the parasitic diodes is inhibited.

A failure diagnosis circuit configured to diagnose an open-circuit failure in a reverse connection protection transistor includes a power supply unit having a switching transistor electrically connected to a power source and the reverse connection protection transistor and is brought into an on state or an off state in response to a control signal, and in which power is supplied from the power source to the reverse connection protection transistor when the switching transistor is in the on state; a power supply control unit that controls power supply to the reverse connection protection transistor and stop of the power supply by outputting the control signal to the switching transistor; and a diagnosis unit that diagnoses an open-circuit failure in the reverse connection protection transistor on the basis of an output state of the control signal and a detection result of voltage between the switching transistor and the reverse connection protection transistor.

An apparatus configured to protect one or more system components from damage due to reverse polarity connection of a power supply comprising a relay located between said power supply and said components, and configured to detect when a power supply is provided with reverse polarity and to consequently switch the relay to an open state to isolate said power supply from said components.

A reverse polarity protection circuit of a DC-DC converter includes an inductive component. When the DC-DC converter is connected to a power supply with correct polarity, the inductive component of the converter receives power via a body diode of a protection switch. Once the inductive component begins to charge and discharge under control of a driving switch, the protection switch turns on and allows full power to be provided to the inductive component. When the DC-DC converter is connected with reverse polarity, a clamping switch fed by the power supply turns on and connects a control input of the protection switch to ground, turning off the protection switch. The clamping switch is protected by a switch protection device to lower the voltage difference between a control input of the clamping switch and an input of the clamping switch.

An electronic protection device for a load includes an arrangement of transistors in series with the load, that can be controlled into a state out of on and off states, an off state being from among first and second off states. The electronic protection device further includes: a current sensor; a control module connected to the current sensor and controlling the arrangement of transistors into its second off state if an intensity measured by the current sensor is above a first threshold; and a voltage sensor connected to the control module. The control module controls the arrangement of transistors into its on state if the voltage is above a voltage threshold and into its first off state if the intensity is below a second threshold.