| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 361090000 | Overvoltage and undervoltage | 34 |
| 20090002905 | Over-Voltage and Under Voltage Protection Circuit - There is provided an apparatus for protection against over voltages and/or under voltages. The apparatus includes a pass transistor through which an input voltage is applied, the input voltage varying between a low voltage and a high voltage, and means for selectively varying the gate voltage of the pass transistor when the input voltage is transitioning from the low voltage to the high voltage or from the high voltage to the low voltage. The pass transistor may include an NMOS or a PMOS transistor. | 01-01-2009 |
| 20090059455 | METHOD AND APPARATUS FOR POWER INTERRUPTION PROTECTION - A power interruption protection module, system and method. The power interruption protection module, comprising a charging module for storing a boosted display voltage, a detecting module for identifying at least one of a drop or an increase of a functioning system voltage, wherein at least one of the drop or the increase is beyond a threshold, and a regulating module for receiving a signal from the detecting module, wherein the signal determines at least one of the drop or the increase beyond the threshold, and wherein the regulating module allows or stops the flow of the stored boosted display voltage of the charging module according to the signal of the detecting module. | 03-05-2009 |
| 20090168283 | VOLTAGE CONTROL CIRCUIT - A voltage control circuit includes first, second and third transistors, a relay, and first, second, and third resistors. The emitter of the first transistor is connected to a first power supply, the collector of the first transistor is connected to a first contact of the relay, a second contact of the relay is grounded; the collector of the third transistor is connected to the first power supply via the third resistor, and the emitter of the third transistor is grounded. The first and second resistors are connected in series between the positive electrode of the second power supply; the base of the second transistor is connected to a node between the first and second resistors, the collector of the second transistor is connected to the base of the third transistor, and the emitter of the second transistor is connected to the first power supply. | 07-02-2009 |
| 20090174978 | SWITCHING POWER SUPPLY DEVICE - A switching power supply device includes: a switching element connected through a primary winding of a transformer to an output end of an input rectifying/smoothing circuit that rectifies and smoothes an alternating current input voltage and outputs a direct current input voltage; an output rectifying/smoothing circuit that rectifies and smoothes a voltage induced in a secondary winding of the transformer and outputs a direct current output voltage; and a control circuit that controls ON and OFF of the switching element. The control circuit includes an overvoltage protection circuit that detects a voltage corresponding to the direct current output voltage and a voltage corresponding to the alternating current input voltage, outputs an overvoltage operation prohibition signal for prohibiting ON and OFF operations of the switching element when the voltage corresponding to the direct current output voltage rises to a first threshold value or more, and releases the overvoltage operation prohibition signal when the alternating current input voltage drops and the voltage corresponding to the alternating current input voltage falls down below a second threshold value. | 07-09-2009 |
| 20090219660 | DIGITAL INTERFACE USED IN MULTI-SERIES-PARALLEL BATTERY MODULES - A digital interface used in multi-series-parallel battery modules is provided and applies the Universal Asynchronous Receiver/Transmitter interface. An Up-Link circuit and a Down-Link circuit are construed by voltage isolation elements for directly connecting a Low Voltage Protection signal of a battery cell, and an Over Voltage Protection signal of the battery cell in series, in associated with receiving and transmission signals of universal asynchronous receiving/transmission, and initiating a forced WakeUp signal of a Micro Control Unit, MCU, of a battery module protection circuit board of each digital interface of the battery modules. The battery monitoring system formed allows battery modules of standard specification to be directly connected to digital signal for monitoring batteries in series, for a plurality of battery modules to be easily connected in multi-series-parallel, and for the battery module to be easily replaced during maintenance to dramatically reduce costs associated with maintenance and custom battery designs. | 09-03-2009 |
| 20090303648 | SYSTEM AND METHOD FOR CONDITIONING A POWER SUPPLY TRANSMISSION FOR SUPPLY TO A LOAD CIRCUIT - A system and method for conditioning an alternating current (“AC”) power transmission for supply to a load circuit. In one aspect, the invention is a system comprising: a power conditioning circuit comprising a voltage surge protector for eliminating voltage spikes in the AC power transmission, an inrush current suppressor for limiting the current of the AC power transmission, a filter for reducing electromagnetic interference and radio frequency interference of the AC power transmission, and a voltage sensing circuit for monitoring a voltage level of the AC power transmission; means for electrically coupling the power conditioning circuit to a source of AC power; outlet means for electrically coupling the power conditioning circuit to a load circuit; wherein the voltage sensing circuit monitors the AC power transmission in a rectified un-smoothed state after the AC power transmission has passed through the filter; and wherein upon the voltage sensing circuit detecting that the voltage level of the AC power transmission exceeds a predetermined upper limit, the AC power transmission is prohibited from reaching the outlet means. | 12-10-2009 |
| 20090310270 | Fast-Responding Short Circuit Protection System with Self-Reset for Use in Circuit Supplied by DC Power - A short circuit protection system includes an inductor, a switch, a voltage sensing circuit, and a controller. The switch and inductor are electrically coupled to be in series with one another. A voltage sensing circuit is coupled across the switch and the inductor. A controller, coupled to the voltage sensing circuit and the switch, opens the switch when a voltage at the output terminal of the inductor transitions from above a threshold voltage to below the threshold voltage. The controller closes the switch when the voltage at the output terminal of the inductor transitions from below the threshold voltage to above the threshold voltage. | 12-17-2009 |
| 20100002349 | BY-PASS DIODE STRUCTURE FOR STRINGS OF SERIES CONNECTED CELLS OF A PHOTOVOLTAIC PANEL - A by-pass circuit includes a first power MOS with an intrinsic diode, a first conduction terminal coupled to a cathode, a second conduction terminal coupled to an anode, and a control terminal. A tank capacitor is coupled to the anode. A second MOS has a first and second conduction terminals, a control terminal, and a turn-on threshold smaller than that of the intrinsic diode, the first conduction terminal thereof coupled to the cathode and the control terminal coupled to the anode, so the first MOS turns on when the array of cells are sub-illuminated. An oscillator and charge pump are supplied through the second conduction terminal of the second MOS to charge the tank capacitor. A control circuit is coupled to the control terminal of the first power MOS to switch it based upon a voltage of the tank capacitor and sign of the voltage between the cathode and anode. | 01-07-2010 |
| 20100014202 | Control Circuit for a Power Field-Effect Transistor and Method for Configuring a Control Circuit for a Power Field-Effect Transistor - An integrated circuit has a control circuit ( | 01-21-2010 |
| 20100085673 | OVER-VOLTAGE AND UNDER-VOLTAGE PROTECTION SYSTEM - An over-voltage and under-voltage protection system for protecting an electrical device includes a comparison device, a signal controller, a switch controller, and a switch. The comparison device receives an input voltage and compares the input voltage with a predetermined voltage. If the input voltage is greater than the predetermined voltage, the comparison device outputs an over-voltage signal to the switch controller via the signal controller. If the input voltage is less than the predetermined voltage, the comparison device outputs an under-voltage signal to the switch controller via the signal controller. The switch controller controls the switch to turn the electrical device off when the over-voltage or the under-voltage signals are received from the signal controller. | 04-08-2010 |
| 20100091420 | CONTROL CIRCUIT WITH PROTECTION CIRCUIT FOR POWER SUPPLY - A control circuit with protection circuit for power supply according to the present invention comprises a peak-detection circuit and a protection circuit. The peak-detection circuit detects an AC input voltage and generates a peak-detection signal. The protection circuit generates a reset signal to reduce the output of the power supply in response to the peak-detection signal. The present invention can protect the power supply in response to the AC input voltage effectively through the peak-detection circuit. | 04-15-2010 |
| 20100103579 | MULTI-BATTERY SYSTEM FOR HIGH VOLTAGE APPLICATIONS WITH PROPORTIONAL POWER SHARING - A multi-battery system for high-voltage applications with proportional power sharing comprises a circuit having a circuit positive and a circuit negative terminal. At least two batteries are provided to combine to deliver required system power. The batteries are connected to a protection circuit, energy storage means, system output voltage sensing means and a logic gate. Protection means generates a protection signal and the voltage sensing means generates an enabling signal that are fed into the logic gate as true signals to generate a true control signal. The true control signal causes the energy storage means to discharge. The digital enabling signal for each of the circuits is time-shifted by a time “t” so that at any time one of the circuits is discharging and one of the at least two circuits is charging during said time “t”. | 04-29-2010 |
| 20100188789 | WINDOW COMPARATOR CIRCUIT FOR LIMITING INPUT VOLTAGE APPLIED TO OBJECT CIRCUIT - Plurality of current mirror circuits CM | 07-29-2010 |
| 20100220420 | VOLTAGE PROTECTION CIRCUIT - A voltage protection circuit includes a first voltage dividing circuit, a second voltage dividing circuit, a transistor and a switching power supply integrated circuit. The first resistor includes a first resistor and a second resistor. The second voltage dividing circuit includes a third resistor and a fourth resistor. The transistor with a base connected to a common end of the first resistor and the second resistor, a collector connected to a common end of the third resistor and the fourth resistor, an emitter connected to ground. The switching power supply integrated circuit includes an input pin, an enable pin and an output pin. | 09-02-2010 |
| 20100232080 | SEPARATING DEVICE HAVING AN ENERGY STORAGE FOR AN ENERGY-CONDUCTING ELECTRIC LEAD - A separating device for an energy-conducting electric lead includes a monitoring unit for checking the electric properties of a lead section of the lead adjacent to the separating device, an energy storage device that is coupled to the monitoring unit such that the function of the monitoring unit can also be maintained in case of a failure of the lead, and a switching element, which is coupled to the monitoring unit and which is equipped such that in case of a failure of the lead the adjacent lead section can be separated. The disclosure further relates to an energy supply system and to a method for providing electric energy from a control center to a plurality of electric devices via an energy-conducting electric lead having at least one such separating device. | 09-16-2010 |
| 20100309597 | APPARATUS FOR PREVENTING OVER/UNDER VOLTAGE, LIGHT EMITTING MODULE, AND DISPLAY APPARATUS - An apparatus for preventing abnormal voltage, a light emitting module, and a display apparatus are provided. The present apparatus for preventing abnormal voltage extracts the highest voltage and the lowest voltage among voltage applied from a plurality of loads, includes two voltage distribution units distributing the highest voltage and the lowest voltage, and detects whether the highest voltage and the lowest voltage applied from the voltage distribution unit are within a predetermined range. Accordingly, the apparatus for preventing abnormal voltage is not affected greatly in terms of its size and cost even if the number of loads to be protected increases. | 12-09-2010 |
| 20110128659 | LOW POWER LOAD SWICH WITH PROTECTION CIRCUITRY - Load switches are relatively common and in use with a variety of applications, and conventional load switches have been designed to have continually operating protection circuitry, which can consume a great deal of power. Here, a load switch integrated circuit (IC) is provided where a controller within the IC activates and deactivates various protection circuits in a sequence, allowing the protection circuit to protect the IC while also reducing power consumption. | 06-02-2011 |
| 20110299207 | HIGH SPEED DIGITAL-TO-ANALOG CONVERTER WITH LOW VOLTAGE DEVICE PROTECTION - A digital-to-analog converter (DAC) includes a first DAC core, a second DAC core, and a butterfly switch. The first DAC core generates a first output. The second DAC core generates a second output. The butterfly switch includes at least one of switch transistors and cascode transistors. The butterfly switch selectively connects the first output and the second output to an output stage of the DAC. | 12-08-2011 |
| 20110317322 | CONTROL CIRCUIT WITH PROTECTION CIRCUIT FOR POWER SUPPLY - A control circuit with protection circuit for power supply according to the present invention comprises a peak-detection circuit and a protection circuit. The peak-detection circuit detects an AC input voltage and generates a peak-detection signal. The protection circuit comprises an over-voltage protection circuit. The over-voltage protection circuit generates an over-voltage protection signal in response to the peak-detection signal. The protection circuit generates a reset signal to reduce the output of the power supply in response to the over-voltage protection signal. The present invention can protect the power supply in response to the AC input voltage effectively through the peak-detection circuit. | 12-29-2011 |
| 20120320481 | Protection System - Devices, systems and methods are provided for protecting electronic circuitry from voltage transients including undervoltage transients in a supply voltage. The device may include a first low voltage isolated transistor coupled in forward bias with respect to a power supply and a second low voltage isolated transistor coupled in series with the first low voltage isolated transistor and in reverse bias with respect to the power supply voltage. The device may further include a resistor coupled between a gate of the first low voltage isolated transistor and the power supply, the resistor configured to limit current flow to the gate of the first low voltage isolated transistor during an overvoltage event. | 12-20-2012 |
| 20130033791 | FAILSAFE GALVANIC ISOLATION BARRIER - A system includes a transmitter, a receiver, a isolation barrier, and a fuse. The isolation barrier is connected to the transmitter. The fuse is connected between the isolation barrier and the receiver. The isolation barrier prevents current flow from the transmitter to the receiver when a voltage across the isolation barrier is less than a first breakdown voltage. The isolation barrier short circuits when the voltage across the isolation barrier is greater than or equal to the first breakdown voltage. The fuse opens when the isolation barrier short circuits. When open, the fuse has a second breakdown voltage that is greater than the first breakdown voltage. | 02-07-2013 |
| 20130038972 | BATTERY POWER MANAGEMENT SYSTEM AND METHOD - A battery power management system including a protection switch, a battery set, a high-voltage protection chip, a plurality of voltage-dividing units and a low-voltage measurement chip is provided. The protection switch and the battery set are connected in series between a first power terminal and a second power terminal of the battery power management system. The battery set includes a plurality of battery cells and has a plurality of sensing nodes. The high-voltage protection chip controls the protection switch according to a plurality of first sensing voltages from the sensing nodes. The voltage-dividing units are connected to a part of the sensing nodes and divide a part of the first sensing voltages to generate a plurality of second sensing voltages. The low-voltage measurement chip is connected to the voltage-dividing units and measures electric quantities of the battery cells according to the second sensing voltages. | 02-14-2013 |
| 20130050890 | MULTI-FUNCTIONAL SOLID STATE POWER CONTROLLER - A solid state power controller apparatus can include an on/off-current limit controller, a pre-charge controller coupled to the on/off-current limit controller, an active damper controller coupled to the on/off-current limit controller and a main switch coupled to and responsive to on/off and protective commands from the on/off-current limit controller. | 02-28-2013 |
| 20130094115 | METHOD AND APPARATUS FOR CHARGING A BATTERY - A method and apparatus for protecting against certain energy sources used to charge a battery is disclosed. | 04-18-2013 |
| 20130107408 | VEHICLE COMMUNICATION COMPONENT AND PROCESS HAVING ACTIVE OVERVOLTAGE PROTECTION | 05-02-2013 |
| 20130229740 | INPUT PROTECTION CIRCUIT - An input protection circuit includes: a first transistor of a field-effect type coupled in series between an input terminal and an electronic circuit, the input terminal receiving an input voltage, the electronic circuit receiving an input voltage, the first transistor switching to an off-state in a case where the input voltage is higher than a positive power supply voltage of the electronic circuit; a second transistor of a field-effect type coupled in series between the first transistor and the electronic circuit, the second transistor switching to an off-state in a case where the input voltage is lower than the negative power supply voltage of the electronic circuit; and a voltage control circuit configured to maintain gate-source voltages of the first transistor and the second transistor as voltages within a power supply voltage range of the electronic circuit based on the input voltage. | 09-05-2013 |
| 20130258538 | Power Conditioning, Distribution and Management - A power conditioning, distribution and management system includes a switch circuit that enables coupling of an AC power supply to a load though an overcurrent device. A control circuit switches the switch circuit from a non-conductive state to a conductive state when a supply voltage signal is between first overvoltage and undervoltage thresholds. The control circuit records an overvoltage event and maintains the switch circuit in the conductive state when the supply voltage signal exceeds a second, higher overvoltage threshold and switches the switch circuit to a nonconductive state when the supply voltage signal exceeds a third, highest overvoltage threshold. The control circuit records an undervoltage event and maintains the switch circuit in the conductive state when the supply voltage signal falls below a second, lower under-voltage threshold and switches the switch circuit to the non-conductive state when the supply voltage signal falls below a third, lowest undervoltage threshold. | 10-03-2013 |
| 20140029147 | Systems and Methods of Direct Cell Attachment for Batteries - Embodiments of the systems and methods of direct cell attachment for battery cells disclosed herein operate without the protection FETs and the protection IC, thereby enabling the direct attachment of battery cells to the system without compromising safety. A charger IC comprises a switching regulator whose output is used to charge the battery through a pass device. In example embodiments of the disclosed systems and methods of direct cell attachment, a combination of switching FETs and the pass device are used as a protection device instead of the charge and discharge FETs. During normal operation, the pass device may be used to charge the battery using the traditional battery charging profile. Under fault condition, the switching FETs and pass device may be driven appropriately to protect the system. | 01-30-2014 |
| 20140043715 | APPARATUS AND METHODS FOR AMPLIFIER FAULT PROTECTION - An amplifier includes a fault protection control circuit biased from the signal pin and a fault protection circuit including a first PMOS transistor and a second PMOS transistor. The sources and bodies of the first and second PMOS transistors can be connected to one another, the drain of the first PMOS transistor can be connected to the amplifier's output, and the drain of the second PMOS transistor can be connected to a signal pin. During normal operating conditions, the fault protection control circuit can turn on the first and second PMOS transistors. However, the fault protection control circuit can turn off the first PMOS transistor and turn on the second PMOS transistor when an overvoltage condition is detected, and can turn on the first PMOS transistor and turn off the second PMOS transistor when an undervoltage condition is detected, even when the integrated circuit is unpowered. | 02-13-2014 |
| 20140049868 | Control Signal Protection Device - A control signal protection device having a first operational mode and a second operational mode includes a first terminal pair that connects the signal protection device to a control system and a second terminal pair that connects the converter to a field device. The control system provided a control signal to the control system protection device. The control signal device further includes a power storing element for temporary accumulation of electric energy and a switching circuit for controlling operational mode of the signal protection device. Electric energy is stored in the power storing element in the first operational mode. Electric energy stored in the power storing element is supplied to a positive terminal in the second terminal pair in the second operational mode. | 02-20-2014 |
| 20140063670 | BATTERY PROTECTION CIRCUIT AND BATTERY PACK INCLUDING THE SAME - A battery protection circuit and a battery pack are disclosed. The battery pack includes the battery protection circuit, which has a switching unit and a control circuit, which controls the switching unit with a control signal. The battery protection circuit also has an external terminal, which is configurable to electrically connect the control signal to a circuit external to the battery protection circuit. | 03-06-2014 |
| 20140177116 | POWER-OFF PROTECTION SYSTEM AND METHOD - A power-off protection system used in a multi-node system includes a detecting module. The detecting module obtains voltage, current and temperature information of all of the nodes and power supplying units in the multi-node system periodically. A determining module determines if any node from the nodes and power supplying units is abnormal. A control module controls a switch connected with the node that is abnormal to turn off, thereby turning off power source connected with the node that is abnormal. | 06-26-2014 |
| 20160064921 | CIRCUIT FOR VOLTAGE DETECTION AND PROTECTION AND OPERATING METHOD THEREOF - A circuit for voltage detection and protection comprises a first block, a first voltage detector, a second block and a second voltage detector. The first block receives a first voltage supply. The first voltage detector detects the first voltage supply and generates a first detecting signal when detecting the first voltage supply level is out of the first operating voltage range. The second block receives a second voltage supply. The second voltage detector detects the second voltage supply and generates a second detecting signal when detecting the second voltage supply level is out of the second operating voltage range. The first block performs a protection operation on the circuit when monitoring at least one of the first and second detecting signals. | 03-03-2016 |
| 20160072274 | Protection Device and Method for Electronic Device - A protection device for protecting an electronic device includes a current sensing module, for detecting a current flowing through a power supply path of the electronic device to generate a current signal; a processing device, coupled to the current sensing module, for receiving the current signal to determine whether the current corresponding to the current signal is greater than a first threshold value and outputting a control signal accordingly; a first switch, disposed on the power supply path, for controlling the power supply path to be switched on or off according to an input voltage of the power supply path; and a first control module, coupled to the processing device and the first switch, for controlling the first switch to be turned on or off according to the control signal outputted by the processing device, in order to control the power supply path to be switched on or off. | 03-10-2016 |
