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| Number | Title | Issue Date |
| 8059378 | Methods of improving the lightning immunity for an SSPC based aircraft electric power distribution system A solid state power controller (SSPC) often contains electronic circuitry which could be damaged or upset by the excessive transient voltages induced by the lightning and SSPC could result in undesirable (or nuisance) trips due to lightning strikes. The present inve... | 11/15/2011 |
| 7706115 | Over-voltage indicator and related circuit and method Over-voltage indicator and related circuit and method. The over-voltage indicator can work with an I/O circuit of a chip for detecting over-voltage in an I/O pad and providing an indication signal accordingly. When over-voltage does not happen, the over-voltage indi... | 04/27/2010 |
| 7394638 | System and method for a whole-chip electrostatic discharge protection that is independent of relative supply rail voltages and supply sequencing The embodiments of the present invention introduced and taught herein are directed to a whole-chip ESD protection arrangement that is independent of relative supply rail voltage and supply sequencing, thereby enabling ESD conduction path during ESD event and isolati... | 07/01/2008 |
| 7379283 | ESD protection circuit with a low snapback voltage that is protected from fast non-ESD voltage spikes and ripples A three-terminal snapback device is utilized with a control circuit to provide a low snapback voltage that is protected from non-ESD voltage spikes and ripples. In response to a fast edge, the control circuit lowers the snapback voltage, unless a status signal indic... | 05/27/2008 |
| 7215523 | Apparatus for protecting an integrated circuit and method thereof An apparatus for protecting an integrated circuit is applied to an electrical apparatus having a control unit. The control unit is used for controlling the integrated circuit and the protecting apparatus. The protecting apparatus includes a power input terminal, a p... | 05/08/2007 |
| 7196891 | Control circuit for frequency converter A control circuit for a frequency converter is provided. The control circuit includes a switch circuit, a timer switch, a starter circuit, a starter relay, and a timer relay. The control circuit is capable of keeping the frequency converter on for a predetermined ti... | 03/27/2007 |
| 7002783 | Over voltage and surge voltage preventing circuit An over voltage and surge voltage preventing circuit for a display module includes resistors that divide an input voltage. A first switching device is turned on when a voltage-divided value made by the resistors is larger than a reference voltage. A second switching... | 02/21/2006 |
| 6885530 | Power limiting time delay circuit A power limiting circuit for power supply that is controlled by a power supply control module includes a shunt regulator having a reference input operatively connected to a voltage input that receives a voltage representative of the power supply control module conne... | 04/26/2005 |
| 6697241 | Circuit for preventing high voltage damage to a MOSFET switch in series with an inductor when current flow is interrupted A circuit for preventing high voltage damage to a MOSFET switch in series with an inductor when current flow is interrupted. Specifically, the present invention discloses a protection circuit comprising a PMOS coupled in series to a load, an inductor, and... | 02/24/2004 |
| 6275093 | IGBT gate drive circuit with short circuit protection An IGBT gate driver circuit includes means for detecting when the collector-to-emitter voltage (Vce) of a turned-on IGBT, intended to be operated in the saturation region, increases above a preset level, indicative of a fault condition, such as a short ci... | 08/14/2001 |
| 6166893 | Semiconductor load driver circuit and method therefor A load driver circuit (10) includes an output driver (11) suitable for driving an inductive load (13). An output clamp circuit (15) clamps the output (12) to a high voltage during turn-off of the output driver (11). An open load detect circuit (26) clamps... | 12/26/2000 |
| 6125020 | Compressor protective device for refrigerator and method of protecting refrigerator compressor A compressor protective device for a refrigerator including a voltage sensor detecting a voltage applied to a compressor through a shunt resistor; a voltage amplifier amplifying a voltage signal from the voltage sensor; a voltage converter converting the ... | 09/26/2000 |
| 6091593 | Early trigger of ESD protection device by a negative voltage pump circuit A transient voltage pump is provided to generate a negative voltage pulse for triggering turn-on of an ESD protection device. As VDD-to-VSS voltage increases rapidly in the initial ESD event, the voltage across the ESD protection device is larger than the... | 07/18/2000 |
| 6075687 | Monitor X-ray protection device An X-ray protection device adapted to be incorporated into a monitor that includes a cathode ray tube actuated by a high voltage from a transformer powered by a low voltage power supply. The X-ray protection device includes a circuit which is coupled to a... | 06/13/2000 |
| 6064556 | Protection circuit for an electric pulse supply line in a semiconductor integrated device A protection circuit for a pulse type power supply line of an integrated circuit device. The protection circuit includes a switching circuit having a preset delay, and a first transistor that is connected between the pulse power supply line and ground. Th... | 05/16/2000 |
| 6014298 | Electrostatic protection circuit of an integrated circuit The protection circuit of the invention connects in series with an internal circuit between a first power source and a second power source. The protection circuit includes a switch which is connected with the internal circuit and one of the first power so... | 01/11/2000 |
| 5864454 | Automatic surge suppressor disconnect protection system A surge suppressor disconnect protection circuit is coupled to a first surge suppressor. The first surge suppressor is electrically coupled to phase and neutral line terminals of an AC source to protect the first surge suppressor from predetermined overvo... | 01/26/1999 |
| 5737168 | Electrical power management system A control system used to monitor an AC power source connected to AC powered user equipment. The control system is designed to monitor the output voltages of the AC power source to ensure that they are maintained within a predetermined operating window con... | 04/07/1998 |
| 5715129 | Electronic overload relay having intrinsic power supply operable from power applied to contactor coil An electronic overload relay has an intrinsic power supply connected in parallel with the NC contact of the relay between wire attachment terminals. The power supply is a parallel connected zener diode and capacitor, connected to the processor in parallel... | 02/03/1998 |
| 5559656 | IGBT switching voltage transient protection circuit A circuit for preventing switching voltage transients from damaging the IGBT during short circuit shut off, utilizing electronic gate control which decrease the rate of fall of the gate voltage of the IGBT only when a short circuit condition is sensed, th... | 09/24/1996 |
| 5499154 | Protective shut-down system for switch-mode power supply For overcurrent protection of a switch-mode power supply in a high power audio amplifier, an active feedback overload shut-down circuit acts though a control input of a PWM (pulse-width modulator) in the switch-mode power supply. In a multi-output switch-... | 03/12/1996 |
| 5489840 | Control circuit for controlling voltage supply to electric devices A control circuit for controlling the voltage supply to selected ones of a plurality of output terminals to which controllable devices are connected to is described. The control circuit comprises manually operable function switches which are connected to ... | 02/06/1996 |
| 5455734 | Insert device for electrical relays, solenoids, motors, controllers, and the like An insert device employing electronics is non-intrusively disposed between an electronic mechanism's pins and female connector in order to provide the mechanism with electronic functional capabilities. The insert device is of a shape, size, and character ... | 10/03/1995 |
| 5448441 | Fault protection circuit for power switching device A fault protection circuit for a power switching device. The circuit compes a driver circuit electrically connected to the power switching device, a saturation comparator electrically connected to the collector of the switching device to determine if the... | 09/05/1995 |
| 5442509 | Protection structure for surge absorbing element A protection structure for a surge absorbing element for protecting equipment such as communications lines from surges caused by lightning or the like which makes use of a surge absorbing element in parallel with the equipment to be protected and a low me... | 08/15/1995 |
| 5440440 | High current solid state AC relay with low EMI emission A solid state relay comprising a pair of SCRs connected in inverse parallel relationship across a pair of output terminals adapted to be connected in series with a source of AC power and a load, each SCR having an anode connected to one of the pair of out... | 08/08/1995 |
| 5432665 | Short circuit protected capacitive load driver A capacitive load driver is protected from short circuits to supply or to ground. The load driver includes an edge detecting monostable circuit and a plurality of sets of field effect transistor (FET) output devices, one set of the FET output devices havi... | 07/11/1995 |
| 5411324 | Circuit configuration for a controller A circuit configuration for an electronic controller has a monitoring circuit which, upon detecting a defective condition, malfunction or defective power supply, maintains the actuator elements of the controller in their initial positions or restores the ... | 05/02/1995 |
| 5400236 | Inventor-controlled power unit An invertor-controlled power unit includes a direct current power source circuit, an invertor circuit, and a pair of output lines. A waveform of voltage appearing between the output lines is detected. There is generated a target output waveform signal hav... | 03/21/1995 |
| 5388022 | Auto reset circuit breaker The specification discloses a solid state auto-reset circuit breaker intended for use in ac circuits, dc circuits and ac/dc circuits. A current sensing device is used to generate a voltage drop proportional to the current flowing through the device. When ... | 02/07/1995 |
| 5379174 | Semiconductor protecting apparatus and method for preventing destruction of internal circuit caused by latch-up In a semiconductor integrated circuit device including a substrate bias voltage generating circuit supplying a substrate bias voltage to internal circuit performing original functions and a substrate where the internal circuit is formed, an N channel MOS ... | 01/03/1995 |
| 5315651 | Active surge rejection circuit The ACTIVE SURGE REJECTION CIRCUIT uses a FET connected in one of the TIP and RING leads to open and close the lead. A JK flip-flop is connected to a voltage sensing circuit which senses voltage surges and clocks the flip-flop early in the voltage rise. T... | 05/24/1994 |
| 5245500 | 270 Volt DC system with transient suppressor The problem of noise and undesirable oscillations on a DC bus (46) are minimized using a transient suppressor (50) in connection with a 270 volt DC power system (10). The power system (10) includes an excited generator (17) developing AC power rectified t... | 09/14/1993 |
| 5202811 | Electrical power system with high voltage protection responsive to plural control voltages Disclosed is an electrical power system adapted to receiving power from a source of alternating current, typically a small alternator and supplying a direct potentially to a load. This power system contains protective circuits which control or shut off a ... | 04/13/1993 |
| 5166854 | Externally discernible power supply abnormality detection system A power supply abnormality detection system of the present invention includes a low-frequency power amplifier circuit equipped with a built-in overvoltage protection circuit for detecting a voltage exceeding, for example, a reference power supply voltage.... | 11/24/1992 |
| 5153802 | Static switch For a preset period following application of a closing order, the semi-conductor of the static power switch, supplied with DC voltage, is controlled by a regulating circuit so as to operate as a current generator limiting the current to a value much lower... | 10/06/1992 |
| 5142432 | Fault detection apparatus for a transformer isolated transistor drive circuit for a power device A protection circuit which electrically isolates logic level and high-side circuits and detects high side power device fault conditions at the isolated, logic level side of the circuit. When an overvoltage or overcurrent condition occurs at the power swit... | 08/25/1992 |
| 5093771 | Inverter circuit and a method for controlling same An inverter circuit which converts d.c. from a d.c. source to single or multiple phase a.c.. Two semiconductor switching elements for each phase are connected in series between two poles of a d.c. source. A signal generator provides a pulse width modulate... | 03/03/1992 |
| 5073724 | Programmable inverse time delay circuit An inverse time delay circuit includes an integrator for receiving a signal representative of a voltage or current in an external circuit and a reference signal. The integrator produces a control signal representative of the integral of the difference bet... | 12/17/1991 |
| 5029269 | Delayed power supply overvoltage shutdown apparatus A pulse-width modulated DC-DC power supply is illustrated with overvoltage protection which upon initial detection momentarily shuts down the pulse-width modulating portion of the control loop for a given cycle. If the overvoltage condition persists for m... | 07/02/1991 |
