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A small umbrella which may be removably attached to a beverage container in order to shade the beverage container from the direct rays of the sun.
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| Number | Title | Issue Date |
| 6344959 | Method for sensing the output voltage of a charge pump circuit without applying a load to the output stage The presently disclosed method and apparatus provides the sensing of an output voltage of a charge pump without applying a load to the output stage. In the charge pump the voltage change which occurs across a capacitor of a stage of the charge pump when t... | 02/05/2002 |
| 6144245 | Adaptive leading edge blanking circuit to eliminate spike on power switching transistor current sense signal Leading-edge blanking circuits blank the leading edge of a current sense signal generated by sensing circuitry sensing the current through a switching field-effect transistor. A current sensor is employed to sense the magnitude of gate current being provi... | 11/07/2000 |
| 6114835 | Multi-cell battery pack charge balancing circuit A charge balancing circuit incorporates a voltage threshold which determines when to initiate a charge balance mode in order to equalize the level of charge in at least two cells of a multi-cell battery pack. Charge balancing is initiated when the voltage... | 09/05/2000 |
| 6115469 | Telephone line ring signal and DC power generator A ring generator circuit provides both a ring signal and talk battery to a subscriber telephone line. The ring generator recognizes whether talk battery voltage or a ring signal voltage is required and supplies the right voltage without the use of externa... | 09/05/2000 |
| 6034496 | Motor speed control using fixed-duration torque bursts A motor controller controls motor rotational speed by repeatedly executing a sequence of operations. Initially, a pulse is generated that causes a predetermined fixed current to be supplied to the motor winding for a predetermined driving interval. The wi... | 03/07/2000 |
| 5982130 | Calibration technique to remove series resistance errors in the sensed back EMF of a motor A motor controller controls a motor's rotational speed using sensed back electromagnetic force (back EMF) of the motor. The sensed back EMF is presumed to contain an error component caused by series resistance in the motor coil. A velocity sense signal is... | 11/09/1999 |
| 5969498 | Induction motor controller A controller for variable speed three-phase AC squirrel-cage induction motors in accordance with a volts-per-hertz control method is disclosed. Direct current ("DC") link current is employed to compensate for rotor slip. In particular, rotor slip is estim... | 10/19/1999 |
| 5929577 | Brushless DC motor controller A brushless DC motor controller including a track and hold circuit responsive to the voltage at the motor centertap terminal and the voltage across at least one motor winding in order to determine the position of the rotor by detecting zero crossings of t... | 07/27/1999 |
| 5886487 | DC motor driver having output FETS that conduct to rectify output overvoltage and undervoltage transients A motor-winding driver circuit includes a high-side double-diffused metal-oxide-semiconductor (DMOS) field-effect transistor (FET) connected between a direct-current (DC) power supply node and a driver output node, and a low-side DMOS FET connected betwee... | 03/23/1999 |
| 5847942 | Controller for isolated boost converter with improved detection of RMS input voltage for distortion reduction and having load-dependent overlap conduction delay of shunt MOSFET A power factor correction controller is disclosed which extracts RMS information from a rectified AC input line voltage signal using a sample and hold analog to digital conversion approach. The controller then processes a digital word representing the RMS... | 12/08/1998 |
| 5767664 | Bandgap voltage reference based temperature compensation circuit A voltage-to-current converter for use with a bandgap voltage reference circuit for providing a correction current to compensate for the adverse effects of temperature. In one specific embodiment, the voltage-to-current converter is used to provide output... | 06/16/1998 |
| 5751139 | Multiplexing power converter A multiplexing power converter for use with a single inductor for providing multiple power outputs is disclosed. The multiplexing power converter includes first switching means for providing a first low resistance path for current to flow from a power sou... | 05/12/1998 |
| 5710697 | Power supply controller having frequency foldback and volt-second duty cycle clamp features A power supply controller implementing frequency foldback and volt-second duty cycle clamp features. An oscillator timing capacitor is charged with a fixed current and is discharged with a fixed current when the output voltage is above a predetermined lev... | 01/20/1998 |
| 5691889 | Controller having feed-forward and synchronization features An integrated circuit controller for a switching power converter implementing feed-forward and synchronization features. The controller IC has pins which permit dual functionality. The feed-forward feature is implemented with a supply voltage from an unre... | 11/25/1997 |
| 5663878 | Apparatus and method for generating a low frequency AC signal An apparatus and method for generating a low frequency AC signal such as a ringing voltage signal for a telephone subscriber interface unit or the like. The apparatus comprises an oscillator which drives a pair of counters whose outputs differ by a desire... | 09/02/1997 |
| 5648780 | Digital to analog converter A multi-stage digital to analog converter with increased speed and enhanced accuracy. Multiple resistor ladders are interconnected through switches with the first resistor ladder converting the most significant bits and successive ladders converting lesse... | 07/15/1997 |
| 5585741 | Impedance emulator A low capacitance impedance emulator suitable for active conductor termination. The impedance emulator includes an emulating FET and a control circuit coupled to the gate of the emulating FET for maintaining the FET in a linear region of operation. The co... | 12/17/1996 |
| 5581170 | Battery protector A battery protector for providing overvoltage and undervoltage protection to one or more series-connected cells. The battery protector includes a voltage detection and comparison circuit, providing an overvoltage signal indicative of whether the voltage a... | 12/03/1996 |
