International Rectifier Corporation

Ternational Rectifier Corporation

Chik Yam Lee

Vincent Thiery

Bruno Charles Nadd

Xavier De Frutos

Xavier Frutos

A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.

Method for operating an H-bridge drive utilizing a pair of high and low side MOSFETS

A circuit for preventing shoot-through in a high side switching transistor coupled in series with a low side switching transistor across a supply voltage, the circuit comprising a voltage reference circuit having an output providing a reference voltage which is negative with respect to the supply voltage provided to the high side switching transistor, the reference voltage being applied to the control electrode of the high side switching transistor when the high side switching transistor is off and the source of the high side switching transistor exceeds the reference voltage and the low side switching transistor is on.

MOSFET gate driver with a negative gate bias voltage

A bandgap voltage reference circuit comprising a first circuit providing a first voltage representative of to Vof a first bipolar transistor, a second circuit providing a second voltage &#x394;Vrepresentative of the difference of two Vvoltages of two bipolar transistors, and a comparator having respective inputs receiving voltages representative of Vand &#x394;Vand an output coupled to the base of the first bipolar transistor whereby a voltage representative of the sum of respective constants multiplying Vand &#x394;Vis provided at the output of the comparator.

Temperature compensated bandgap voltage reference

H-bridge drive utilizing a pair of high and low side MOSFET's in a common insulation housing

An electronic fuse comprising an integrated circuit having a control output terminal coupled to a control electrode of a power semiconductor switching device, the power semiconductor switching device being coupled in series with a load between first and second potentials, the integrated circuit further comprising a current sense input for sensing the current through the power semiconductor switching device, the integrated circuit further comprising a driver circuit for driving the power semi-conductor switching device, the driver circuit being coupled to a current limiting circuit responsive to the sensed current in the power semiconductor switching device, the current limiting circuit controlling the driver circuit whereby if the current through the power semiconductor switching device exceeds a predetermined threshold, the current limiting circuit generates a command to pulse the power semiconductor switching device on and off in a period of pulsed operation to maintain the current in the power semiconductor switching device below a predetermined level, further comprising a first timer circuit for limiting the period of pulsed operation to a preprogrammed first duration and further for controlling the power semiconductor switching device whereby if two commands to pulse the power semiconductor switching device are generated by the current limiting circuit within a duration less than a predetermined second duration, the power semiconductor switching device is turned off.

Electronic fuse

A power switching circuit comprising a power semiconductor switching device, a charge pump circuit having a control input to control whether it is on or off and a charge pump output, the charge pump output being coupled to a control terminal of the power semiconductor switching device, a bootstrap power supply for supplying power to driver circuitry for the power semiconductor switching device, the bootstrap power supply comprising a bootstrap capacitor coupled to a charging current source, the bootstrap power supply providing power to the driver circuitry when the power semiconductor switching device is being switched by the driver circuitry in a pulsed mode, and the charge pump supplying a control voltage to turn on the power semiconductor switching device and maintain it on when the power switching semiconductor device is to be maintained on continuously.

Growing community of inventors

Courtaboeuf, France

Chik Yam Lee