Quotables
"Radio has no future."
Lord Kelvin, British mathematician and physicist ; 1897
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4135235 | Synthesizer circuit for generating three-tier waveforms A DC to AC converter capable of producing up to three-tier waveforms includes a first transistorized switching amplifier operable to a first condition, for charging a first capacitor to +2E volts, concurrent with applying +E volts to a first terminal, and... | 01/16/1979 |
| 4126819 | Interlock circuit for complementary electronic switches Two transistors each have their emitter-collector circuits coupled in series between one end of a motor field winding and the opposite terminals of a D.C. voltage source to switch current flow in either direction through the winding. Two current sensors a... | 11/21/1978 |
| 4121281 | Direct current converter An improvement in the design of a dc converter with a push-pull oscillator n a bridge connection is disclosed. The design is symmetrical about the bridge diagonal. Each symmetrical half in one bridge branch includes a capacitor and in the other bridge bran... | 10/17/1978 |
| 4105957 | Full wave bridge power inverter A full bridge inverter includes four bipolar transistors of like conductivity type, connected in a bridge circuit including an apex to which a load is connected. During a first time interval, emitter collector paths of a first pair of transistors are conn... | 08/08/1978 |
| 4106088 | Current drive circuits A current drive circuit for deriving a triangular current waveform for driving an inductive load, such as the field coils of a bubble memory, comprises a series of at least four diodes connected between the positive and negative input voltage lines. A pai... | 08/08/1978 |
| 4099225 | Protective circuit for an inverter The invention relates to a protective circuit for an inverter having semiconductor control elements. The protective circuit includes a series regulator in its inlet branch and an intermediate filter circuit with the capacitor thereof extending between the... | 07/04/1978 |
| 4092610 | Modulated carrier amplifying system A system providing linear amplification of a signal including a pulse duration modulation of the signal upon a carrier signal, the system further including a plurality of amplifying units which are sequentially activated by the modulated carrier. The ampl... | 05/30/1978 |
| 4089049 | Inverter circuit including transformer with shielding of undesired radiations A transformer with an electrostatic shield body between its primary and secondary windings, one end of the shield body being connected to a zero potential point of the primary side from the AC standpoint. This reduces the capacity coupling between the pri... | 05/09/1978 |
| 4071812 | AC Inverter with constant power output A constant voltage square wave inverter drives a load connected as the damping element in an otherwise high Q, resonant matching circuit. The frequency of the inverter is maintained near the resonant frequency of the load circuit to provide substantially ... | 01/31/1978 |
| 4063306 | Actively switched damping circuit This disclosure is of an inverter type power supply including an actively switched damping circuit for limiting voltage transients in the inverter circuitry. Such damping is accomplished by switching an energy absorbing element into parallel circuit relat... | 12/13/1977 |
| 4050006 | Inverter having constant frequency chopper synchronized to modulation frequency A static inverter has a chopper transistor between a unidirectional source and the inverter load current carrying semiconductor switches, time ratio controlling means including a constant frequency oscillator for modulating the chopper at the constant osc... | 09/20/1977 |
| 4048554 | Variable frequency, variable voltage power supply A static polyphase inverter for supplying variable frequency, variable magnitude voltage to a load such as a polyphase motor has a transistor chopper between a unidirectional power source and an inverter bridge having n phase legs each of which includes a... | 09/13/1977 |
| 4047081 | Commutating arrangement for an electric motor supplied from a DC voltage source A circuit for use with an electric motor being supplied by a DC voltage source is disclosed. More particularly, in accord with the invention, the circuit includes a main transistor which is adapted to be connected to the DC voltage source and which is con... | 09/06/1977 |
| 4039921 | Inverter radiation suppression A transistor inverter includes at least a pair of switching transistors, a transformer with primary and secondary windings, a DC voltage source with a pair of output terminals and a voltage reference terminal, and a rectifying circuit connected to the sec... | 08/02/1977 |
| 4027228 | Photocoupled isolated switching amplifier circuit A switching transistor inverter circuit for driving high power AC loads such as arc discharge lamps from a DC electrical energy source. Each switching transistor is included in a switching amplifier whose response time is short as compared with the respon... | 05/31/1977 |
| 4020361 | Switching mode power controller of large dynamic range This invention concerns improvements in the switching control of power or voltage into a load. Specifically it is concerned with a new time sequencing technique for the switching states of a four-switch configuration for the purpose of producing a three-s... | 04/26/1977 |
| 3976932 | Bridge transistor inverter circuit A bridge type switching transistor inverter circuit for driving high power AC loads such as arc discharge lamps from a DC electrical energy source. Four switching transistors are arranged in bridge configuration that the load may be connected alternately ... | 08/24/1976 |
| 3967173 | Transistor bridge inverter motor drive having reduced harmonics A harmonic reduced pulse width modulation, variable speed transistor bridge inverter drive controls frequency and magnitude of stator voltage applied to an induction motor so as to maintain constant flux in the motor and permit maximum driving torque to b... | 06/29/1976 |
