Abstract: An active rectifier of a rotary electric machine, in particular an active rectifier for alternators, for example for rectifying alternating currents (AC) to direct currents (DC) for charging batteries on vehicles, is disclosed. The active rectifier may include a plurality of power MOSFET transistors and a detecting and driving circuitry all mounted on a single substrate to form a half-bridge module. A number of at least two and up to N modules may be connected together to serve as a two and up to N-phase rectifier. Each module is connected in a way to rectify currents from one phase of the electric machine and has an individual power supply for the detecting and driving circuitry. The power supply may receive the power from the phase which is being rectified and operates independently of the alternator's voltage regulator.

Abstract: A pin fin cooling system may include at least one first surface defining at least a base portion of the cooling system, and at least one pin fin array of a plurality of pin fins and at least one coolant fluid flow detector extending from the first surface. The coolant fluid flow deflector may be configured to split a coolant fluid flow from a primary flow into at least two secondary flows that follow a predetermined path over local heat sources, and may have a maximum wall thickness that is equal to a diameter of a cross-section of one of the pin fins. The cooling system may further include at least one boundary fin extending from the first surface that is in the shape of a spline, at least a portion of which may correspond and match at least a portion of a pattern of the pin fin array.