Forghani-Zadeh
Hassan P. Forghani-Zadeh, Allen, TX US
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20150021614 | CONTROLLED ON AND OFF TIME SCHEME FOR MONOLITHIC CASCODED POWER TRANSISTORS - A semiconductor device includes a depletion mode GaN FET cascoded with an enhancement mode NMOS transistor. A gate of the GaN FET is electrically coupled to a source of the NMOS transistor through a gate network. The gate network controls at least one of a turn-on time and a turn-off time of the GaN FET. The gate network may be controlled by an input signal to a gate of the NMOS transistor. | 01-22-2015 |
Hassan Pooya Forghani-Zadeh, Allen, TX US
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20110109374 | DYING GASP CHARGE CONTROLLER - In many applications, “dying gasp” periods following power down are used. Conventional circuits supply energy for the “dying gasp” periods generally by use of large external capacitors that are bulky and expensive. Here, a dying gasp charge controller is employed that allows for the use of smaller capacitors at higher voltages, which maintains or exceeds the energy storage capacities of conventional circuits. | 05-12-2011 |
20130241621 | System and Apparatus for Driver Circuit for Protection of Gates of GaN FETs - A half-bridge power circuit comprises a first gallium nitride field effect transistor (GaN FET); a first driver coupled to a gate of the first GaN FET; an anode of a capacitor coupled to an output of the driver and a source of the first GaN FET; a diode having a cathode coupled to the cathode of the capacitor; and a bootstrap capacitor clamp (BCC) controller, including: a field effect transistor (FET) coupled to an anode of the diode, and a comparator coupled to a gate of the FET, the comparator configured to receive as inputs: a) a signal representative of an input voltage (VDRV) applied to the FET; b) a ground; c) a boot signal representative of a voltage at the anode of the capacitor (Boot); and d) a signal representative of a voltage at the source of the first GaN FET (SW). | 09-19-2013 |
Hassan Pooya Forghani-Zadeh, Fort Worth, TX US
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20150362931 | HIGH-EFFICIENCY PUMP AND DUMP CIRCUIT HAVING REDUCED STORAGE CAPACITOR - A device includes an input voltage supply line, a processing component, an input capacitor, a storage capacitor, a buck/boost converter and a controlling component. The input voltage supply line receives an input voltage, V | 12-17-2015 |
H. Pooya Forghani-Zadeh, Dallas, TX US
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20090072803 | INRUSH CURRENT CONTROL - One embodiment of the present invention includes a power supply system. The power supply system comprises a variable voltage source configured to provide and incrementally increase a control voltage associated with a pass-transistor. The power supply system also comprises an inrush current monitor configured to monitor a current-flow through the pass-transistor. The power supply system further comprises a voltage control circuit configured to halt the incremental increase of the control voltage in response to the current-flow exceeding a predetermined current limit. | 03-19-2009 |
20090185397 | SECONDARY-SIDE AMPLIFIER WITH SOFT START - An isolated switching regulator has a closed-loop soft-start feature that allows tighter regulation of the output voltage and eliminates or reduces overshoot. It also has an optional reset feature which will resoft-start the regulator during recovery from a fault on the output voltage. | 07-23-2009 |
20100052647 | PROGRAMMABLE POWER DISTRIBUTION SWITCHES WITH TWO-LEVEL CURRENT SENSING - Programmable power distribution switches with two-level current sensing are disclosed. In a particular example, a power distribution switch includes a programmable output device having a resistance based on a programmed maximum output current and generates an output voltage based on the resistance and a load current. The example power distribution switch also includes a reference voltage generator that is configured to generate a reference voltage corresponding to the output voltage when the load current is substantially equal to the programmed maximum output current. A current limiter is also included to reduce the load current in response to a comparison of the output voltage and the reference voltage, when the comparison is indicative of the load current exceeding the programmed maximum output current. | 03-04-2010 |
20100053832 | POWER DISTRIBUTION SWITCH CIRCUITS WITH FAST RESPONSES TO HARD SHORT-CIRCUITS - Methods and apparatus to provide power distribution switch circuits with fast responses to hard short-circuits are disclosed. In one example, a power distribution switch to detect a hard short-circuit condition is described, comprising a switching device having a resistance between an input terminal and an output terminal, to conduct a current from an input power source having an input voltage to an output terminal having an output voltage, a voltage feedback loop having a digital output voltage to increase the resistance of the switching device in response to a short-circuit based on the output voltage, and an analog current feedback loop to increase the resistance of the switching device based on a current through the switching device and a reference current. | 03-04-2010 |
H. Pooya Forghani-Zadeh, Allen, TX US
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20130314061 | POWER REGULATION WITH LOAD DETECTION - One embodiment of the present invention includes a power regulator system. The system includes a power stage configured to provide an output voltage to a load in response to an input voltage and a control signal. The system also includes a feedback system that receives the input voltage and is configured to generate the control signal based on the output voltage. The system further includes a load detector configured to determine a state of the load and to set the power to the feedback system based on determining the state of the load. | 11-28-2013 |
20150042302 | POWER MANAGEMENT APPARATUS WITH RAPID SHORT RESPONSE AND FULL LOAD RECOVERY - A voltage feedback loop employed with a power distribution switch rapidly responds to a predetermined drop in output voltage to increase the resistance of the switch for a predetermined time. After this predetermined time, a current feedback loop controls the resistance until the output voltage recovers, while also isolating the voltage feedback loop from the switch. | 02-12-2015 |