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A forehead support apparatus for resting a standing users forehead against a wall above a bathroom commode or urinal or beneath a showerhead.
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| Number | Title | Issue Date |
| 7423403 | Motor control system A motor control system which can realize current detection with high accuracy by using an amplifier having an ordinary level of accuracy and can avoid deterioration of current detection accuracy even when emperature is changed. The motor control system comprises a s... | 09/09/2008 |
| 7327103 | Driver and method for control of voice coil motor in disk drive A driver for a voice coil motor in a disk drive includes a sensor that provides a sense current by sensing a coil current in the voice coil motor, a comparator that provides an error current by determining a difference between a command current and the sense current... | 02/05/2008 |
| 7311081 | Electronic throttle control system with integrated controller and power stage One embodiment includes an apparatus comprising a closed loop feedback controller and a power output stage to couple to the closed loop feedback controller. The closed loop feedback controller and the power output stage are combined to form a single element. ... | 12/25/2007 |
| 7285930 | Method and device for controlling a multiphase electronically commutated motor A method is specified for controlling a multiphase motor that is commutated by an inverter-side bridge circuit, in the course of which a particularly precise and technically simple detection of a control-relevant variable of a considered motor phase, in particular o... | 10/23/2007 |
| 7283596 | PAM-4 data slicer having symmetrical offset A PAM-4 data slicer includes first, second, and third comparators which provide first, second, and third thresholds, respectively. Each of the comparators has an offset. The first and third comparators have an offset generating arrangement at their outputs to provid... | 10/16/2007 |
| 7230989 | System and method for processing digital visual interface communication data signals and display data channel communication signals over a transmission line A digital communication system for transmitting and receiving Digital Visual Interface (DVI) communication data signals and Display Data Channel (DDC) communication signals over a transmission line comprises an open-loop equalizer circuit and a DDC extension circuit... | 06/12/2007 |
| 7075745 | Disk drive In a disk drive apparatus for forcibly restoring a head to a retract position when a power voltage is greatly lowered, the head is moved in a direction toward the retract position when detecting a small decrease in the power voltage. ... | 07/11/2006 |
| 6943514 | Motor control circuit for supplying a controllable driving current For applying a driving current to a motor, an H-bridge circuit is constructed by a first and a second switching unit and a first and a second linear unit. An error amplifier generates an error signal representative of a difference between the driving current detecte... | 09/13/2005 |
| 6937071 | High frequency differential power amplifier A differential CMOS amplifier includes two CMOS inverters and biasing circuitry providing feedback loops across the output and input of each inverter. The biasing circuitry provides linear biasing so that the inverters can apply a desired gain to a pair of high freq... | 08/30/2005 |
| 6611167 | Balanced bi-directional current source A balanced bi-directional current source is provided, which includes first and second current output terminals, a current control circuit, first and second amplifiers and first and second sense impedances. The current control circuit has a reference input... | 08/26/2003 |
| 6184665 | Integrated current mode PWM drive system supply voltage scaleable while retaining a high precision In a current mode pulse width modulation (PWM) integrated drive system having an external load, a switched-capacitor amplifier and a sample & hold stage connected in cascade form a current sensing amplifier for a control loop. The current sensing amplifie... | 02/06/2001 |
| 6154001 | Anti-glitch circuit for voice-coil-motor servo operation in disk drive systems A circuit to pull down a driver circuit of a motor, including a circuit to monitor the input signal to a driver amplifier to compare the input signal with the output signal from the motor and to output a difference signal when the input signal and the out... | 11/28/2000 |
| 6060858 | C-dump switched reluctance hysteresis control A circuit and method for controlling a switched reluctance motor are provided. The circuit includes a phase coil and a switch that controls a current in the phase coil responsive to a hysteresis control signal. The circuit also includes a current sensor t... | 05/09/2000 |
| 5920163 | Phase detecting circuit of brushless motor and magnetic recording and reproducing apparatus using the same A differential amplifier amplifies a PG reproduction signal to a level permitting signal processing. A low-pass filter makes the signal waveform of a PG detection signal generated by the differential amplifier substantially uniform irrespectively of the r... | 07/06/1999 |
| 5861775 | Signal conditioning circuit for low amplitude, high common mode voltage input signals A cost-effective conditioning circuit for extracting a weak, floating, wide-band signal with a low common-mode voltage from noisy environments is proposed that includes a high gain single ended operational amplifier to increase the amplitude of the signal... | 01/19/1999 |
| 5781068 | Transadmittance amplifier for a motor A transadmittance amplifier provides an output current that is proportional to an input voltage level. The output current drives a coil of an electric motor (the load) through a sense resistor, the voltage drop across the sense resistor providing an indic... | 07/14/1998 |
| 5736826 | Dual hysteresis control circuit A control circuit, in particular for a direct current control in positioning systems, comprising a differential circuit (1), a control logic (2) and a full bridge (3) connected between a supply voltage VS and a reference potential GND. The diff... | 04/07/1998 |
| 5659230 | Brushless motor drive circuit A brushless motor drive circuit which can suppress switching pulses without using capacitors or other external components is provided. The brushless motor drive circuit has a hall element for generating two sinusoidal signals of opposite phase and a switc... | 08/19/1997 |
| 5587640 | Delayed safety braking apparatus for a servomotor control system A servomotor control system is set forth that assists in overcoming the problem of servomotor shut down during a failure of the programmable control system and/or servo-amplifier. The presently disclosed servomotor control system includes a programmable c... | 12/24/1996 |
| 5559416 | Direct current motor control circuit in positioning systems A control circuit, in particular for a direct current control in positioning systems, comprising a differential circuit (1), a control logic (2) and a full bridge (3) connected between a supply voltage VS and a reference potential GND. The diff... | 09/24/1996 |
| 5495156 | Actuator retraction circuit Method and apparatus for retracting an actuator comprising determining back emf voltage generated by the actuator motor; applying the determined voltage to a capacitor-resistor network; applying a holding voltage to the capacitor-resistor network. The app... | 02/27/1996 |
| 4914367 | Operating device for the cover of a sliding and lifting sunroof Operating device for the cover of a sliding and lifting sunroof of a motor vehicle having a desired value transmitter and an actual value transmitter for controlling the sliding sunroof function and the lifting roof function via an actuator that is part o... | 04/03/1990 |
| 4885517 | Voice coil actuator positioning amplifier A signal amplifier including a bridge output stage, a comparator stage arranged to control a first part of the output stage in accordance with the polarity of an input signal, and a modulating stage arranged to control a second part of the output stage in... | 12/05/1989 |
| 4851753 | Proportional motor control circuit A proportional control circuit for the direction and precise speed control of D.C. electric motors such as those used to drive camera tilt/pan mountings. The circuit applies current to D.C. motors in a push/pull proportional scheme whereby slewing speed i... | 07/25/1989 |
| 4812778 | Isolation amplifier An isolator for connection between an informational signal source and a high voltage controlled load may be used with numerous combinations of different input signal type and magnitude and output signal requirements. The compensation for input and output ... | 03/14/1989 |
| 4777382 | Pulse width logic/power isolation circuit A circuit is disclosed which provides power isolation between the initializing and driven circuit, allowing the logic of a wide pulse width signal to be effectively transmitted across pulse transformers and faithfully reproduced.... | 10/11/1988 |
| 4644239 | Motor actuator with control means responsive to internal and external conditions A motor actuator, responsive to conditions such as temperature, and to the position of a mechanism which the motor moves during operation, such as a damper which separates a refrigerating chamber from a cold storage area. The motor actuator is a capable o... | 02/17/1987 |
| 4556835 | Operating mechanism for movable parts, especially for sliding roofs and sliding/lifting roofs An operating system for movable parts for the selective closing or exposing of openings, especially for sliding roofs and sliding/lifting roofs of motor vehicles. The operating mechanism has a motor drive for the movable part and an actuating member for s... | 12/03/1985 |
| 4549124 | Circuit arrangement for controlling the action of an adjusting device, in particular for a patient chair A circuit arrangement for controlling the action of an adjusting device, in particular of a patient chair, which comprises, as target value indicator, a digital-analog converter (1) and, as actual value indicator controllable by the adjusting device, a po... | 10/22/1985 |
| 4538099 | Amplifier circuit A driver amplifier circuit for an electromechanical position translator having two coils of substantially equal inductance and resistance is disclosed. The circuit includes an input for a control voltage representing desired translator position and a refe... | 08/27/1985 |
| 4506203 | Small deadband servocontrol system A circuit for controlling the position of a driven member is disclosed which includes a control circuit for controlling the application of electrical power to a motor and a circuit element operable for generating position error signals corresponding to th... | 03/19/1985 |
| 4496886 | Three state driver for inductive loads A three state driver for an inductive load, e.g., a stator winding of a variable reluctance motor, allows the use of charge, idle, and discharge states in which a positive voltage, a short, and a reverse voltage are connected across the inductive load, re... | 01/29/1985 |
| 4492908 | Apparatus for synchronizing the slats of motor driven window blinds This invention relates to a circuit arrangement and the associated mechanism for slaving the angles of rotation of the slats of a plurality of centrally controlled sun or window blinds. The driving motor of each blind is provided with current via a corres... | 01/08/1985 |
| 4481452 | Control circuit for electromagnetic devices In a control circuit, which has a current switching-over circuit including at least four switching transistors for controlling a current flowing through an electromagnetic device, the control circuit has driving circuits each of which drives the switching... | 11/06/1984 |
| 4463296 | Vehicle motor driving circuit A driving circuit for use in controlling a motor for controlling an air mixing door, an inner and surrounding air change-over door and a mode setting door and the like used in a vehicle air conditioning device, or a motor used in opening or closing of win... | 07/31/1984 |
| 4446410 | Control circuit for a solenoid-operated actuator A control circuit comprises a switching element connected in series with the coil of an actuator for generating a drive current when rendered conductive. A drive current sensing resistor is coupled in a circuit with the switching element and the coil to d... | 05/01/1984 |
| 4441081 | Switching power driving circuit arrangement This dual operating mode switching power driving circuit arrangement comprises an amplifying circuit of conventional form which is operated substantially as a Class A feedback amplifier in a servosystem "following" mode and is switched to operate as a Cla... | 04/03/1984 |
| 4358724 | Solid state servo amplifier for a D.C. motor position control system A linear solid state servo amplifier operated from a low voltage source and which develops a voltage across the servo motor equal to the source voltage diminished only by the saturation voltages of two of its output transistors has a bridge output stage o... | 11/09/1982 |
| 4303875 | Device for the remote control of the angular position of an aerial rotor A device for the remote control of the angular position of an aerial rotor comprising a d.c. motor for the rotation of the rotor and a drive circuit adapted to cause the rotation of the motor in one direction when it receives as input a d.c. voltage highe... | 12/01/1981 |
| 4274039 | Servo-amplifier circuit A circuit for a servo-amplifier saves power when the position servo has reached balance. The servo input is a high frequency differential transformer having its armature positioned by mechanical means driven by a servo motor controlled through amplifier c... | 06/16/1981 |
