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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 4527226 | Inverter control system for providing an easily filtered output An inverter control system for selecting an angle set defining an inverter output waveform in response to various operating conditions of the inverter. The inverter control system selects an angle set in response to signals representing the power factor o... | 07/02/1985 |
| 4521672 | Electronic welding apparatus An electronic welding apparatus which, for controlling at least one welding parameter, such as welding voltage or welding current, comprises a switching mode power supply as a control element and preferably being regulated on the primary. The actual value... | 06/04/1985 |
| 4521671 | Electronic welding apparatus An electric welding apparatus which, for controlling at least one welding parameter, such as welding voltage or welding current, comprises a switching mode power supply (SMPS) as control element, the switching mode power supply preferably being regulated ... | 06/04/1985 |
| 4453205 | DC/AC Converter with shunt regulated load A circuit including a dc/ac converter for supplying an ac consumer with an alternating voltage, such as a sinusoidal voltage, from a dc voltage source has an auxiliary load circuit which is connected in parallel with the ac consumer, the auxiliary load ci... | 06/05/1984 |
| 4375662 | Method of and apparatus for enabling output power of solar panel to be maximized The d.c. power supplied by a photovoltaic solar panel to a load is controlled by monitoring the slope of the panel voltage vs. current characteristic and adjusting the current supplied by the panel to the load so that the slope is approximately unity. The... | 03/01/1983 |
| 4350891 | Low ripple regulated X-ray tube power supply A low ripple high voltage power supply is disclosed for use in a dental X-ray system, utilizing a rectifier and regulator circuit to provide a low voltage regulated DC signal, a DC-AC converter for providing a high frequency chopped power signal suitable ... | 09/21/1982 |
| 4342075 | Switched mode DC to DC converter using variable leakage transformer A variable leakage transformer or a variable voltage transformer comprising a magnetic core with a main magnetic path and a sub-magnetic path, the main magnetic path having at least a common magnetic path with the sub-magnetic path, a primary winding woun... | 07/27/1982 |
| 4328458 | Variable leakage transformer and control circuit therefore A variable leakage transformer having a closed main magnetic path and a closed submagnetic path having a leg common with said main magnetic path. A primary winding is wound on said common leg, and a secondary winding is wound on said main magnetic path. T... | 05/04/1982 |
| 4317040 | Low ripple regulated X-ray tube power supply filament transformer A low ripple high voltage power supply and a filament transformer for use therewith in a dental X-ray system are disclosed. The power supply utilizes a rectifier and regulator circuit to provide a low voltage regulated DC signal, a DC-AC converter for pro... | 02/23/1982 |
| 4287556 | Capacitive current limiting inverter A trapezoidal reference voltage waveform is provided to a PWM inverter for synthesizing an inverter output voltage waveform having substantially the same shape as the reference for effecting limiting of peak capacitive current at the output of a high-leak... | 09/01/1981 |
| 4287557 | Inverter with improved regulation A feedback loop is provided within an inverter feedback control system for modifying reference voltage to effect modifying output voltage from the inverter circuit thereby to maintain constant average rectified resistive current to a complex load, compens... | 09/01/1981 |
| 4253139 | Power conversion and regulation system A DC or AC power conversion and regulation system in which DC or rectified AC is applied to a voltage controlled oscillator (VCO). The output of the VCO is applied to a frequency sensitive filter whose frequency response is such that for a fixed input vol... | 02/24/1981 |
| 4251736 | Method for controlling power flow between an electrochemical cell and a power grid A method for controlling a force-commutated inverter coupled between an electrochemical cell and a power grid for adjusting the magnitude and direction of the electrical energy flowing therebetween. Both the real power component and the reactive power com... | 02/17/1981 |
| 4251735 | Dual speed control circuit for power flow through an inverter A control circuit for a force-commutated inverter connected intermediate a regenerative DC power source and a power grid, the power source/inverter combination operative to supply AC electrical energy to, or receive AC electrical energy from or adjust the... | 02/17/1981 |
| 4246633 | Voltage control circuitry for UPS A voltage control circuit for an uninterruptible power supply (UPS), said UPS involving a controlled rectifier operating from an input AC line to charge batteries and to hold them at a constant voltage; the batteries supply power to an inverter which in t... | 01/20/1981 |
| 4236197 | Voltage regulation loop for inverter power supply A voltage regulation loop for the rejection of line frequency ripple of 0-180 Hz in an inverter power supply is disclosed. The loop includes an error amplifier (E), a pulse-width modulator (P), an inverter (I), a second summing node (N2), an ou... | 11/25/1980 |
| 4169222 | Induction cook-top system and control This specification discloses an induction heating cook-top including touch controls for controlling the operation thereof. The cook-top includes a source of direct current voltage and a first heating unit having a first induction heating coil connected to... | 09/25/1979 |
| 4149233 | Circuit for automatic load sharing in parallel converter modules A nondissipative circuit for automatic load sharing in parallel converter modules having push-pull power transistors, each transistor having a separate current-sensing transformer and an impedance-adjusting transformer in series with its collector. The im... | 04/10/1979 |
| 4112287 | Central oscillator for induction range using triac burner controls An apparatus for inductively heating cooking utensils comprising four induction cooking coils excited by a central power oscillator providing an alternating sinusoidal excitation voltage at about 25 kilohertz which is 100% amplitude modulated at 120 hertz... | 09/05/1978 |
| 4071884 | Integrated circuit high voltage DC converter A step-up DC converter suitable for construction as an integrated circuit chip provides a separate rectangular wave oscillator using a silicon transistor and a power amplifier driven thereby which supplies current to the primary winding of a two-winding s... | 01/31/1978 |
| 4013859 | Induction cooking unit having cooking load sensing device and essentially zero stand-by power loss An induction heating unit is provided having an essentially zero stand-by power requirement and comprised by a high power solid-state inverter for supplying relatively high frequency excitation currents to an induction heating coil, and including inhibit,... | 03/22/1977 |
| 4008427 | Variable input power supply An electronic power supply using pulse width modulated (PWM) voltage reguion provides a regulated output for a wide range of input voltages. Thus, the invention apparatus is very versatile and many different types of equipment may be interchangeably used... | 02/15/1977 |
