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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 |
| 8184461 | Power conditioner and solar photovoltaic power generation system A first circuit generates a first sequence of square wave voltages having a voltage level that changes to a positive side relative to a first reference potential, which is a potential on a negative-electrode side of a direct current power source, from a direct curre... | 05/22/2012 |
| 8184462 | Power conversion apparatus, power conditioner, and power generation system A first chopper circuit generates a first sequence of square wave voltages having a voltage level that changes to a positive side by chopping a direct current voltage at a system frequency. A second chopper circuit generates a second sequence of square wave voltages... | 05/22/2012 |
| 7907431 | Devices and methods for converting or buffering a voltage Embodiments of the invention relate to devices and methods for converting or buffering a voltage including an inductor configured to perform at least a primary function and to be reused to contribute to converting or buffering the voltage as a secondary function. | 03/15/2011 |
| 7564706 | Power factor corrected single-phase AC-DC power converter using natural modulation A power factor corrected (pfc) ac-dc converter has a modified boost input and a modified buck output. Unlike the prior art boost input, the boost switch returns to the output, not to ground. Unlike the prior art buck output stage, a third switch connects to the inpu... | 07/21/2009 |
| 7554826 | Method and apparatus to control output power from a switching power supply Techniques are disclosed to control output power from a switching power supply. A sample power converter controller circuit includes a control circuit coupled to be coupled to a switch. The control circuit includes a current sense circuit to be coupled to a primary ... | 06/30/2009 |
| 7369380 | Highly available dual serial bus architecture In a highly available storage system, an enclosure includes first and second power supplies, and first and second controller boards. Each of the first and second controller boards includes first and second serial bus controllers. First and second serial buses are co... | 05/06/2008 |
| 7365525 | Protection for switched step up/step down regulators A four switch voltage converter is regulated for buck mode and boost mode under constant frequency valley-peak current mode control. Protection circuits are responsive to output voltage and regulator current to prevent excessive current that otherwise might result f... | 04/29/2008 |
| 7336514 | Electrical power conservation apparatus and method An electrical power control apparatus and method for power factor correction in a conventional 60 hertz or other conventional frequency electrical AC power supply communicated to an inductive load. A plurality of interruptions of current in the line on both sides of... | 02/26/2008 |
| 7330364 | Device for converting high voltage alternating current (AC) to low voltage direct current (DC) and method therefor A method and circuit for converting high voltage AC to low voltage DC using a switched power supply and rising edge conduction has an alternating current (AC) power source. A rectifier is coupled to the AC power source. A switching device is coupled to the rectifier... | 02/12/2008 |
| 7327589 | Full-bridge circuit A full-bridge circuit for a heat dissipation system. The heat dissipation system further includes a fan and a control circuit. The control circuit outputs a first control signal and a second control signal. The full-bridge circuit includes a first control line havin... | 02/05/2008 |
| 7304457 | Bridgeless power factor corrector circuit and control method thereof The present invention discloses a bridgeless rectified power factor corrector circuit and control method thereof. The bridgeless rectified power factor corrector circuit includes a power factor corrector inductor, two diode rectifiers, a control unit, two power MOS ... | 12/04/2007 |
| 7292016 | Buck/boost DC-DC converter control circuit with input voltage detection A semiconductor device has a DC-DC converter control circuit for selectively carrying out a boosting operation and a deboosting operation in accordance with a value of a power supply voltage supplied to the DC-DC converter control circuit and for outputting an activ... | 11/06/2007 |
| 7283338 | Power supply device for low-voltage electronic residual current circuit breakers A power supply device for low-voltage electronic residual current circuit breakers includes an electronic rectifier stage suitable to receive in input a mains voltage and to generate a first unipolar voltage whose value depends on the value of the mains voltage, and... | 10/16/2007 |
| 7282896 | Apparatus and method for sliding-mode control in a multiphase switching power supply A current-sharing multiphase sliding-mode switching power supply (24) and method of operation are presented. A bipolar power source (22) is coupled to a switch (30) for each phase (28), each switch (30) is in turn coupled to an ind... | 10/16/2007 |
| 7279868 | Power factor correction circuits A bi-directional boost circuit for power factor correction includes a power factor control circuit and a pair of diodes, a pair of inductors, and a pair of switches. A first diode, a second diode, a first inductor, a second inductor, a first switch, and a second swi... | 10/09/2007 |
| 7276886 | Dual buck-boost converter with single inductor A dual output buck-boost power converter operates with a single inductor to achieve high efficiency with automatic or inherent load balancing. Switches associated with the opposite polarity outputs are driven based on feedback signals, with one feedback signal being... | 10/02/2007 |
| 7274173 | Power control circuit for charge storage element A DC voltage source, a switch, and an inductor are connected together in series. The inductor is also connected together with a switch, a piezoelectric element in series. Moreover, the switches are connected in parallel with capacitors. By the control circuit, a sta... | 09/25/2007 |
| 7274116 | direct-current power supply and battery-powered electronic apparatus equipped with the power supply A bypass control section (6) maintains a bypass switch (5) in the ON state during the period when a battery voltage (Vi) is higher than the output voltage (Vo) to an external load (L). Upon falling of the output voltage (Vo) at a desired voltage (ET), ... | 09/25/2007 |
| 7271564 | Method, apparatus, and system for drive control, power conversion, and start-up control in an SRM or PMBDCM drive system A power converter for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor may include first and second partial circuits for forming multiple conduction circuits in cooperation with first and second phase windings of the motor. The c... | 09/18/2007 |
| 7269038 | Vrms and rectified current sense full-bridge synchronous-rectification integrated with PFC A synchronous full bridge rectifier is controlled to provide a power factor near unity. The full bridge rectifiers are transistors each with a controlling input. The AC input signal and currents within the circuit are sensed and sent to a controller. In response, th... | 09/11/2007 |
| 7265522 | Dynamic multiphase operation A control system for controlling a multiphase output regulator having a regulated DC output and operating at a switching frequency. The multiphase output regulator including at least two switch arrays to generate individually controllable output phases that combine ... | 09/04/2007 |
| 7256637 | High voltage switching apparatus A switching arrangement for a high voltage load provides high voltage pulses to the load. The switching arrangement includes switching modules, where n is typically (75). A load capacitance is Cd is required to avoid voltage overshoot at the load and is provi... | 08/14/2007 |
| 7254003 | Differential nulling avalanche (DNA) clamp circuit and method of use A circuit for protecting an electronic device including a differential nulling avalanche clamp circuit (200, 300) and method of using the circuit in an electronic system (100) to limit radio frequency overdrive. The electronic system (100) inclu... | 08/07/2007 |
| 7242169 | Method and apparatus for voltage compensation for parasitic impedance An apparatus and method for regulating a voltage to a load to compensate for one or more parasitic impedances. A first amplifier measures the voltage drop due to a first parasitic impedance, and a second amplifier measures the voltage drop due to a second parasitic ... | 07/10/2007 |
| 7236380 | Rectifier system having different rectifier elements A rectifier system, in particular a rectifier bridge for a three-phase generator, includes a plurality of rectifier elements, specifiable rectifier elements being different from the other rectifier elements in at least one property. The rectifier elements are, for e... | 06/26/2007 |
| 7230407 | Apparatus and method for fixed-frequency control in a switching power supply A sliding-mode switching power supply (24) having N phases (28) and a method of operating the power supply (24) are provided. N switches (30) are coupled to a bipolar power source (22), with each switch (30) effecting one ph... | 06/12/2007 |
| 7230405 | Non-isolated power conversion system having multiple switching power converters A non-isolated power conversion system has an input stage and an output stage. A plurality of cascaded switching power converter stages are coupled between the input stage and the output stage. Each of the plurality of switching power converter stages has at least o... | 06/12/2007 |
| 7218081 | Power system having multiple power converters with reduced switching loss The present invention includes multiple power converters for driving one or more loads via an input power source, AC or DC. A first switching power converter has first one or more windings coupled to an input power source, and a second switching power converter havi... | 05/15/2007 |
| 7215560 | EMI noise reduction circuit and method for bridgeless PFC circuit A circuit and method for improving EMI noise performance in a bridgeless PFC boost converter. Such a converter comprises a boost inductor having a first end connected to a first AC input terminal and a second end connected to a first junction defined between the ano... | 05/08/2007 |
| 7209004 | DB-linear variable gain amplifier (VGA) stage with a high broad band The invention relates to a VGA stage having a novel circuit configuration for amplifying/attenuating a differential input signal which is transmitted via a transmission line (H). The VGA stage comprises an operational amplifier (OPV1, OPV2), which is c... | 04/24/2007 |
| 7208922 | Voltage regenerator The invention focuses on a voltage transformer (VT) that includes at least two transformer stages (VT I, VT II), each of them with an input connection and to each of which an input subvoltage UEI, UEII is attached and added together they form a... | 04/24/2007 |
| 7205681 | Generation and distribution of a dual-redundant logic supply voltage for an electrical system A power supply device (20) for an electrical system generates a primary logic supply voltage signal and one or more backup logic supply voltage signals from a plurality of sources (22, 24). The primary and backup logic supply voltage signals are distri... | 04/17/2007 |
| 7200017 | Controller and driving method for supplying energy to display device circuitry A controller for controlling at least two power circuits comprises a phase-shift selector for generating a reference signal according to variable input signals, the reference signal is programmed to indicate an amount of phase-delay according to a number of CCFL pow... | 04/03/2007 |
| 7176753 | Method and apparatus for outputting constant voltage A constant voltage outputting apparatus includes a differential amplifier circuit, an amplifier circuit, a current adjustment device and a stabilization circuit. The differential amplifier circuit performs a differential amplifying operation and outputs a differenti... | 02/13/2007 |
| 7173834 | Half-controlled silicon-controlled rectifying system and method thereof A half-controlled silicon control rectifying system and method thereof are provided. In this case, the first detection unit detects the zero cross phase of the triphase AC in input port thereof. The second detection unit detects the voltage of the DC bus. Then the c... | 02/06/2007 |
| 7174069 | All optical multiplexer A multiplexed optical communication system includes a plurality of chopping modulators associated with a first plurality of channels to receive input optical pulses having a first width and to produce therefrom chopped optical pulses having a second width narrower t... | 02/06/2007 |
| 7170268 | DC to DC converter with high frequency zigzag transformer A DC to DC converter including a zigzag transformer. The transformer operates at high frequency with integrated magnetics and does not provide isolation. The multiphase converter has gate inputs with PWM signals appropriately phase-shifted depending on the number of... | 01/30/2007 |
| 7170766 | High power switching converter A high power isolated switching converter is provided, comprising a first power (11) stage and second power (12) stage connected in cascade such that the second power (12) stage is by-passed during part of a start-up mode. ... | 01/30/2007 |
| 7154723 | Highly available dual serial bus architecture In a highly available storage system, an enclosure includes first and second power supplies, and first and second controller boards. Each of the first and second controller boards includes first and second serial bus controllers. First and second serial buses are co... | 12/26/2006 |
| 7148663 | Switching power supply circuit A switching power supply circuit attaining high power conversion efficiency and a low operation start lower-limit voltage is provided. The switching power supply circuit in accordance with the present invention comprises an input terminal to which an input voltage i... | 12/12/2006 |
