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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 8184456 | Adaptive power converter and related circuitry A resonant power converter circuit stage can be configured to: i) receive a rectified voltage derived from an AC input voltage; ii) convert the rectified voltage to an internal voltage based on the application of a duty cycle that varies depending on the input volta... | 05/22/2012 |
| 8179114 | Voltage converting device and voltage converting method A changing-speed calculator monitors a current value of an output current flowing through a load circuit to calculate a change speed of the current value. A correction-amount obtaining unit reads from a correction-amount table a correction amount of a duty ratio cor... | 05/15/2012 |
| 8179113 | Buck-Boost switching regulator and method thereof for DC/DC conversion A method for DC/DC conversion comprises operating in a Boost mode of operation or in a Buck-Boost mode of operation. Furthermore, the method comprises switching from the Boost mode of operation to the Buck-Boost mode of operation, if a desired value (VOUTR) of an ou... | 05/15/2012 |
| 8174247 | Microwave transmission line DC/DC converter A method and an electrical circuit for DC-DC voltage conversion in a network comprising an input voltage terminal, an output voltage terminal, at least one first switch and at least one second switch, at least one input impedance, at least one load impedance and at ... | 05/08/2012 |
| 8174850 | Method and circuit for avoiding hard switching in half bridge converters A half bridge switching dc-dc converter an input dc voltage to an output dc voltage. The converter includes a switching circuit for receiving the input dc voltage and generating a periodic square wave voltage oscillating from a high value corresponding to the input ... | 05/08/2012 |
| 8174248 | Systems and methods of bit stuffing pulse width modulation Systems and methods for bit stuffing pulse width modulation are provided. Example embodiments of the systems and methods of bit stuffing pulse width modulation disclosed herein may allow for a significant reduction in the size of the bootstrap capacitor while giving... | 05/08/2012 |
| 8169208 | Output current detection of a voltage regulator For output current detection of a voltage regulator, the currents in a high-side transistor and a low-side transistor of the voltage regulator are sensed and summarized to a summed current to flow through a setting resistor. The voltage variation on the setting resi... | 05/01/2012 |
| 8169799 | Power factor correction circuit A power factor correction circuit steps up and power-factor-corrects a rectified voltage, which has been rectified from an AC input voltage of an AC power source Vin, through an ON/OFF operation of a switching element Q1 and supplies a stepped-up output volta... | 05/01/2012 |
| 8169804 | Three-phase buck-boost power factor correction circuit and controlling method thereof The configurations of a three-phase buck-boost power factor correction (PFC) circuit are provided. The circuit includes a first single-phase buck-boost PFC circuit receiving a first phase voltage and having a first and a second output terminals and a neutral-point f... | 05/01/2012 |
| 8164931 | Rectifier circuit with a voltage sensor A rectifier circuit with a synchronously controlled semiconductor element comprising at least one field effect transistor with a control electrode and two switching electrodes. The control electrode operates the reverse state and the forward state between the switch... | 04/24/2012 |
| 8159200 | DC-DC converter circuits, and methods and apparatus including such circuits Electrical power from an input voltage supply is converted to first and second output voltages of opposite polarities using a single inductor (L) and only four principal switches (S1, S2, S4, S6). In contrast to known circuits, none of th... | 04/17/2012 |
| 8159206 | Voltage reference circuit based on 3-transistor bandgap cell A voltage regulator comprises first and second bipolar transistors operating at different current densities; a resistance is connected between their bases across which ΔVBE appears. A third bipolar transistor is connected such that its base voltage is eq... | 04/17/2012 |
| 8154264 | Method and systems for conduction mode control Methods for selecting between the two modes (states) of operation, continuous conduction and discontinuous conduction, are disclosed. Systems that are capable of selecting the operating mode and operating in the continuous conduction mode or the discontinuous conduc... | 04/10/2012 |
| 8154315 | Self-referencing voltage regulator A voltage regulator includes an input terminal for receiving a power input having a first voltage level, and an output terminal for generating a power output. A reference signal having a second voltage level is derived from the first voltage level adjusted with a pr... | 04/10/2012 |
| 8154899 | Portable power supply for laboratory equipment A portable power supply for controlling laboratory experiments, the power supply includes input terminals that receive control signals and power terminals that supply power to laboratory devices. The power supply enables power levels of standard laboratory equipment... | 04/10/2012 |
| 8154266 | Bi-directional DC power circuit Bi-directional direct current (DC) power circuit having: a signal processing module for processing feedbacks of output voltage and voltage drop, and outputting pulse control and directional control signals; a pulse width modulation (PWM) module for outputting pulse ... | 04/10/2012 |
| 8154888 | Offline synchronous rectifier circuit with turned-on arbiter and phase-lock for switching power converters A synchronous rectifier circuit of a switching power converter is provided and includes first and second power transistors and first and second diodes connected to a transformer and an output of the power converter for rectifying. An arbiter circuit generates a lock... | 04/10/2012 |
| 8148972 | Filter circuit and method of controlling same Disclosed is a filter circuit that includes means for monitoring currents flowing through positive and negative windings of a common-mode noise filter, and means for performing an adjustment based on the result of monitoring so as to equalize the current flowing pos... | 04/03/2012 |
| RE43291 | PFM-PWM DC-DC converter providing DC offset correction to PWM error amplifier and equalizing regulated voltage conditions when transitioning between PFM and PWM modes To prevent a voltage glitch in the regulated DC output voltage of a PWM/PFM DC-DC converter when switching between PFM and PMW modes, the error amplifier of the converter's PWM regulation path is provided with a DC voltage offset correction mechanism. This mechanism... | 04/03/2012 |
| 8149596 | N-phase full bridge power converter An N-phase full bridge power converter, comprising: a load device; a plurality of bridge legs, each being composed of two power switches; a plurality of transformers, each being coupled between two nodes each disposed between two power switches in two adjacent bridg... | 04/03/2012 |
| 8148971 | Layout of a reference generating system A layout of a voltage/current reference system is disclosed. A first voltage/current reference circuit (for example, a bandgap reference circuit) and a second voltage/current reference circuit are respectively laid out on either side of a substrate, such as edges or... | 04/03/2012 |
| 8149598 | Switching power supply apparatus A switching power supply apparatus according to the present invention includes a switching device and a control circuit, and the control circuit includes: a control terminal through which an auxiliary power voltage is supplied; an error amplifier which generates a d... | 04/03/2012 |
| 8143874 | Switch-mode power supply (SMPS) controller integrated circuit determining operating characteristics from filter component information A switch-mode power supply (SMPS) controller integrated circuit (IC) provides ease of integration and SMPS designs. Value and/or types of components external to the controller IC that affect the SMPS control loop response are provided to the IC and an internal conve... | 03/27/2012 |
| 8138736 | Power system having a local sense control dominant over a remote sense control to avoid effects of interconnection failure modes A power system is configured to provide a regulated voltage to an electrical load connected to a power source through at least one power line. The power system includes a first voltage control loop based on a remote sense signal indicative of voltage level at the lo... | 03/20/2012 |
| 8134347 | Apparatus and method for recycling the energy from load capacitance The present invention provides a voltage regulator/power converter capable of bidirectional power propagation, fitted with controls capable of raising and lowering voltages with unprecedented speed and accuracy. The bidirectional capability allows energy stored in c... | 03/13/2012 |
| 8134346 | System and method for power factor correction A system and method for dynamically adjusting capacitance added in parallel to an electrical line input for improving efficiency of an electrical system. A microprocessor monitors in real time the current and voltage wave forms of a system and selects the optimum am... | 03/13/2012 |
| 8134848 | Closed-loop efficiency modulation for use in AC powered applications A system and method for closed-loop efficiency modulation for an AC/DC power system is provided. A boost-buck converter and a DC/DC converter connected in series receive a rectified DC feed signal from a AC input signal and deliver a modified DC output to an active ... | 03/13/2012 |
| 8129959 | Start-up circuitry and method for power converter In one embodiment, circuitry is provided for startup of a power converter. The circuitry includes a bias capacitor operable to be charged for providing energy to a controller of the power converter. A divider circuit is coupled to a voltage source. Current flows thr... | 03/06/2012 |
| 8129971 | Multi-cell voltage regulator In some embodiments, the number of active cells in a multi-cell voltage regulator is controlled so that the current-per-active-cell approaches a predefined target or to be within an acceptable range so that the active cells operate with suitable efficiency. ... | 03/06/2012 |
| 8130517 | Forward converter transformer saturation prevention A power converter in one aspect limits the magnetic flux in a transformer. A control circuit included in the power converter includes a pulse width modulator, logic circuits and saturation prevention circuits. The saturation prevention circuits assert a first signal... | 03/06/2012 |
| 8130519 | Led driver with low harmonic distortion of input AC current and methods of controlling the same A power supply circuit for powering a load at constant current has a rectifier stage for receiving an AC voltage input and for producing a first substantially DC voltage. A first capacitor is attached to the load. A charge-pump is attached to an output of the rectif... | 03/06/2012 |
| 8129964 | Interleaved/all-phase mode switched PWM system A multi-phase power switching converter having first and second states includes a pulse width modulator having an output, a converter output providing an output signal, and a plurality of drivers, each having an output electrically coupled to the converter output an... | 03/06/2012 |
| 8125206 | Semiconductor device and power supply using the same A power-supply control IC is included in a switching power supply which drives to turn on and off a semiconductor switching device connected to a DC power supply in series to supply a predetermined constant voltage to an external load, and is a semiconductor device ... | 02/28/2012 |
| 8125202 | Protection circuit for protecting a half-bridge circuit The present invention relates to a protection circuit for protecting a half-bridge circuit. The protection circuit detects an incorrect response of the half-bridge by monitoring the current of a first switch at a series resistor of a second switch. The protec... | 02/28/2012 |
| 8125198 | Multi-function modulator for low-powered, wired and wireless command, control, and communications applications An amplitude, phase and frequency modulator circuit is provided with the circuit containing a periodically driven switch. The circuit connects a DC power source and a resistive load. Periodic operation of the switch generates a square-wave of voltage across the load... | 02/28/2012 |
| 8120935 | Power converter with dual ring network control A method for providing electric power to a power system includes receiving, at a slave node of a power converter having a plurality of slave nodes, a first synchronization signal via a first communication channel, the first synchronization signal purporting to repre... | 02/21/2012 |
| 8115468 | Controller and driver communication for switching regulators Pulse width modulation (PWM) controllers and output stage driver circuits and related methods of communicating switching regulator mode information. The controller includes circuitry that recognizes intervals when the load driven by the regulator is in a low power m... | 02/14/2012 |
| 8116103 | Device for feeding electric energy into a power grid and DC converter for such a device The device is for feeding electricity into a power grid (8) with a DC generator (1), a DC converter (2) and an inverter (3), and particularly to a DC converter (2) suited for the device. The DC converter (2) comprises a chok... | 02/14/2012 |
| 8115463 | Compensation of LDO regulator using parallel signal path with fractional frequency response A low drop out (LDO) voltage regulator (10) includes a pass transistor (MPpass) having a source coupled by an output conductor (4) to a load and a drain coupled to an input voltage to be regulated. An error amplifier (2) has a first i... | 02/14/2012 |
| 8111058 | Circuit for generating reference voltage of semiconductor memory apparatus A reference voltage generating circuit in a semiconductor memory apparatus comprises a driving control signal generating unit configured to generate a driving control signal according to a temperature variation, wherein the driving control signal generating unit is ... | 02/07/2012 |
