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| Number | Title | Issue Date |
| 4510563 | Switching power supply An off-line switching regulated power supply employing a switching transistor, wherein the base drive system is improved to supply a reverse base current, remaining an interval after the termination of a forward base current, thereby the influence of the ... | 04/09/1985 |
| 4507721 | DC-DC Converter for remote power feeding A floating type DC-DC converter for remote power feeding is connected via a power separating filter to a signal line on which an AC signal is superimposed on DC power. The DC power separated by the power separating filter is stored in an input capacitor a... | 03/26/1985 |
| 4485431 | DC-DC Converter A DC-DC converter in which a DC voltage is intermittently applied to a transformer through a switching circuit performing repeatedly turning on-off operations. An offset is imparted to the voltage waveform applied to the transformer for separating a trans... | 11/27/1984 |
| 4456835 | Method of operating a load from alternating current mains and circuit arrangement therefor In the disclosed circuit arrangement for operating the load from alternating current lines, an inductance connected to the load serves as a first energy store. A first control switch switches the energy storage on and off in response to a regulator circui... | 06/26/1984 |
| 4443839 | Single ended, separately driven, resonant DC-DC converter A single ended, separately driven, resonant DC-DC converter including a transformer, a capacitor connected in parallel with a primary winding of the transformer, a switching transistor connected between one end of the primary winding of the transformer an... | 04/17/1984 |
| 4441146 | Optimal resetting of the transformer's core in single ended forward converters The transformer's core in single ended forward converters is reset by a "magnetizing current mirror" consisting of a capacitor in series with an auxiliary switch which, during the OFF period of the primary switch, couples the capacitor to one of the trans... | 04/03/1984 |
| 4438485 | Efficiency switching-mode power supply A switching-mode, blocking oscillator based power supply employs proportional base drive and an improved design of rise-time suppression to improve effeciency and reliability. Current limiting elements cooperate with pass transistor control circuits to pr... | 03/20/1984 |
| 4429186 | Floating battery feed circuit for telephone subscriber line interface An arrangement for providing a subscriber line with an operating potential. The energy to the line is transferred thereto inductively at a fixed frequency and includes the rectification means on the subscriber side of the inductor. The amount of energy tr... | 01/31/1984 |
| 4423476 | d.c. Blocking oscillator charging device for electric vehicles A charging device for traction batteries of an electric vehicle consists of a converter module with at least two d.c. blocking converters, each including a control power transistor, a cutoff relief circuit, and a power transformer. The secondary winding o... | 12/27/1983 |
| 4417153 | High frequency switching circuit A single-ended switching circuit is constituted by a primary winding of a transformer, a switching circuit connected between the primary winding and a DC power supply and on-off operated with a predetermined cycle and also with a predetermined "on" period... | 11/22/1983 |
| 4401902 | High frequency switching circuit A switching element is connected between a power supply and the primary winding of a transformer, and it is on-off controlled with a predetermined cycle and with a predetermined conducting period. The secondary winding of the transformer is connected to a... | 08/30/1983 |
| 4399376 | High frequency switching circuit A switching element, a transformer having a primary winding connected through said switching element to a DC power supply and a resonance capacitor connected in parallel with the primary winding of said transformer constitute a single-ended switching circ... | 08/16/1983 |
| 4386394 | Single phase and three phase AC to DC converters A single phase AC to DC power converter is provided which accepts a single AC line input voltage and provides a DC output voltage. Input current feedback is used to control the converter and to provide high quality sinusoidal line currents in phase with t... | 05/31/1983 |
| 4377842 | Flyback voltage control Flyback power supply with secondary circuit damping during primary charging. This reduces the induced or reflected oscillations into the primary circuit and superimposition onto the primary current so that the latter becomes a monotonically increasing fun... | 03/22/1983 |
| 4370701 | Energy conserving drive circuit for switched mode converter utilizing current snubber apparatus An energy conserving drive circuit is provided for switched mode power converters having a transformer with primary current controlled by a main power switch whose conduction is in turn controlled by a pulse width modulator. Transformer leakage inductance... | 01/25/1983 |
| 4365171 | Low loss snubber circuit An improved snubber circuit for a bipolar switching transistor connected to drive an inductive transformer load comprises a first resonant circuit connected to the driven winding of the transformer and a second resonant circuit connected to a clamp windin... | 12/21/1982 |
| 4363067 | Transistor chopper protection circuit A circuit for protecting the transistor of a high current transistor chopper from damage due to inductive energy stored in the chopper circuit when the transistor is biased nonconductive. The inductive energy charges a capacitor connected in parallel with... | 12/07/1982 |
| 4356541 | Rectifier A rectifier in which a semiconductor active element, which is a rectifying element, and a diode are connected in parallel in the same direction so that the degradation in rectifying efficiency due to the delay in rise time of voltage when the active eleme... | 10/26/1982 |
| 4323840 | Switching mode regulator A switching mode regulator of improved efficiency and reliability is described in which both the turn-on and turn-off transients are controlled. In switching mode regulators, a flyback diode turns off when the transistor switch turns on, but if stored cha... | 04/06/1982 |
| 4302803 | Rectifier-converter power supply with multi-channel flyback inverter An AC to DC power supply having a multi-channel, flyback inverter output section regulated via a fixed frequency, pulse width modulation controller. The controller indirectly regulates each channel by regulating an auxiliary channel, whereby the duty cycl... | 11/24/1981 |
| 4281372 | Power supply for magnetron and the like loads A flyback-type high-frequency, high-voltage power supply for energizing a self-rectifying load, such as a magnetron microwave power generator for a microwave oven and the like. A switching device is connected in series with a primary winding of a transfor... | 07/28/1981 |
| 4277824 | Start-up circuit A start-up circuit includes a capacitor which is initially charged by the AC line voltage. When the voltage across the capacitor is sufficient to breakdown a zener diode and overcome the gate to cathode voltage drop of an SCR, the SCR snaps on applying th... | 07/07/1981 |
| 4274133 | DC-to-DC Converter having reduced ripple without need for adjustments A switching dc-to-dc converter employs inductance in series with the source to form an input circuit, and in series with the load to form an output circuit. Suitable switching means alternately connects an energy transfer capacitance in series in the inpu... | 06/16/1981 |
| 4268898 | Semiconductor switching circuit with clamping and energy recovery features A circuit for holding the voltage across a rapidly switched semiconductor element such as a transistor used in an inductive circuit to substantially twice the voltage of an input source when the element is switched to its nonconducting state. Also include... | 05/19/1981 |
| 4264971 | Converter devices The converter device transforms a changing direct signal generated by a source of direct current, into a signal whose amplitude is substantially greater than that of said changing signal, at least for certain values of this signal. It comprises a first tr... | 04/28/1981 |
| 4241395 | Non-dissipative DC active filter and transformer Non-dissipative filtering of a DC voltage, or current, is provided with an energy storage inductor coupled sequentially in alternate directions across the DC source. In another embodiment the inductor is part of the primary of a transformer and secondary ... | 12/23/1980 |
| 4224659 | Stabilized power supply circuit In a stabilized power supply circuit including a feedback circuit, wherein there alternately occur a time during which a current is caused to flow in a transformer so that energy is stored therein and a time during which the energy stored in the transform... | 09/23/1980 |
| 4156895 | Transistor flow through converter A flow through converter utilizing a transistor as the switching element with its collector emitter path connected in parallel with a capacitor and a transformer which is arranged in the power circuit and the output winding which is connected to a rectifi... | 05/29/1979 |
| 4144485 | Contactless connector circuit A contactless connector circuit for connecting two or more conductors with one another by means of reactance coupling, e.g., inductance coupling or capacitance coupling and transmitting electrical signals from one conductor to another by alternating curre... | 03/13/1979 |
| 4079295 | Power supply arrangement with minimum interaction between plural loads A source of alternating current in a power supply and deflection system of a television receiver is coupled to a primary winding of a transformer, a relatively closely coupled secondary winding of which provides a voltage which may be rectified for provid... | 03/14/1978 |
| 4073003 | High efficiency low-loss power supply A synchronized power supply for use with display systems and data processing equipment in general in which information is displayed on a screen such as a cathode ray tube in which the power supply is synchronized to the display such that internal synchron... | 02/07/1978 |
| 4070699 | Charging circuits using controlled magnetic fields A circuit for charging an electrical storage device, such as a capacitor, from a source of energy via an induction coil interconnected between the source of energy and the storage device. Current from the source of energy builds up a magnetic field within... | 01/24/1978 |
| 4031453 | Triggered transistor switching regulator A switched-mode power supply in which disturbing oscillations which are produced by the associated (auto) transformer are eliminated by means of a clipping circuit, a supply voltage being generated for the driver stage which controls the switch. This meas... | 06/21/1977 |
| 4028606 | Control circuit for a switched-mode power supply, particularly for a television receiver A switched-mode power supply provided with a control stage and a switching stage coupled by means of a transformer. The collector of an additional transistor is connected to the transformer. In this manner the ratio of the collector current to the base cu... | 06/07/1977 |
| 4028596 | Corona power supply circuit A portable power supply circuit for supplying a high voltage corona in a portable electrophotographic apparatus. An A.C. signal comprising a series of pulses is produced by an oscillating circuit. The pulses are shaped by a shaping circuit which draws cur... | 06/07/1977 |
| 4027200 | High voltage generating circuit A high voltage generating circuit for a television receiver including a flyback transformer having primary and secondary windings which are loosely coupled to achieve substantial operational isolation therebetween. The secondary winding has a diode rectif... | 05/31/1977 |
| 3986097 | Bilateral direct current converters Bilateral converters are disclosed which translate direct current voltages at one level to direct current voltages at another level. The same converter can also be used to translate direct current voltages at the second level back to direct current voltag... | 10/12/1976 |
| 3986085 | Corona power supply circuit A portable power supply circuit for supplying a high voltage corona in a portable electrophotographic apparatus. An A.C. signal comprising a series of pulses is produced for a predetermined period of time. The pulses are shaped by a shaping circuit which ... | 10/12/1976 |
| 3963973 | Nonsaturating asymmetric DC/DC converter A DC converter including a transistor switch and a transformer having first and second windings connected so that the transistor passes asymmetrical current pulses to the first winding. When the switch opens, asymmetrical current pulses again pass through... | 06/15/1976 |
