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| Number | Title | Issue Date |
| 7332950 | DLL measure initialization circuit for high frequency operation A memory device, delay lock loop circuit (DLL) and DLL reset circuitry are described. The DLL includes a shift register and a measured delay for pre-loading the shift register. The reset circuitry selectively filters a clock signal propagation through the measured d... | 02/19/2008 |
| 5225972 | Power source A power source driving an electrical device includes a DC power supply providing a rectified and smoothed DC voltage from an AC main power, a self-oscillator energized by the DC power supply to generate a high frequency voltage, and a transformer which pr... | 07/06/1993 |
| 5159540 | High-efficiency saturable core voltage converter A self-oscillating DC to DC voltage converter having improved efficiency. The high efficiency saturable core voltage converter 100 of the present invention provides an output voltage across an output load RL in response to the input voltage at ... | 10/27/1992 |
| 5130609 | Illuminating device incorporating gas-filled chambers A light source having two potential terminals, a transformer coil having a primary incorporating two windings and a secondary transistor, the first potential terminal being connected to the first winding of the primary, which is connected to the base of t... | 07/14/1992 |
| 5053727 | Circuit coupling an oscillator to an electrical load A circuit comprising an oscillator having a load coupled thereto by means of at least one voltage-dependent coupling element that exhibits a high impedance at relatively low voltages and low impedance at relatively higher voltages. The voltage-dependent c... | 10/01/1991 |
| 4984145 | Circuit arrangement for free-running blocking-oscillator type switched power pack A circuit arrangement for a free running blocking oscillator type switched power pack includes a control means for pulse width modulated drive of an electrical switch element. The control means receives as controlled information, among other things a zero... | 01/08/1991 |
| 4960124 | Device for low-frequency electrotherapy A device for low-frequency electrotherapy wherein the output current of a low-frequency oscillator is applied to the subject's body through a pair of electrodes placed on the subject's body, comprising a first oscillator circuit that generates a low-frequ... | 10/02/1990 |
| 4960125 | Device for low-frequency electrotherapy in a humid environment Disclosed is a novel device for low-frequency electrotherapy wherein a moisture proof variable resistor is used to control the output level of a low-frequency diphasic action potential circuit. The diphasic circuit produces a voltage having a pulse width ... | 10/02/1990 |
| 4904961 | Control circuit for blocking oscillator This invention relates to a blocking oscillating converter for transferring energy from a source of power, such as a vehicle battery, to a storage means, such as an energy storage capacitor in a capacitor discharge ignition system. A novel control and fee... | 02/27/1990 |
| 4882663 | MOSFET flyback converter In a flyback converter, a 15 Amp N-channel power MOSFET is driven to saturation by a gate voltage derived by connecting the gate to the relatively high-magnitude (150 volt) B+ voltage by way of a resistor of relatively high resistance (about 20 kilo-Ohm).... | 11/21/1989 |
| 4818953 | Oscillator improvement An improved oscillator circuit for avoiding core saturation without the need for auxiliary magnetic devices employs an emitter resistance for regulating base voltage, and a semiconductor base shunt for initiating transistor cut-off when the base voltage i... | 04/04/1989 |
| 4775821 | Variable input voltage DC to DC converter with switching transistor drive current regulator The DC to DC converter includes a coupled inductor having a primary winding and a feedback winding. A drive current regulator circuit receives a variable input voltage from the feedback winding but transmits a constant base drive current to the base termi... | 10/04/1988 |
| 4745535 | Ringing choke type DC/DC converter A ringing choke-type DC/DC converter comprising a transformer having a primary winding, a secondary winding, and a feedback winding, an input DC power source connected through a transistor to the primary winding of the transformer, a DC power output conne... | 05/17/1988 |
| 4737898 | Single-ended self-oscillating, DC-DC converter with regulation and inhibit control A transistor oscillator produces at the secondary winding of a transformer output pulses with a pulse width which is dependent upon stored charge in the base of the transistor, the collector-emitter path being connected in series with a primary winding of... | 04/12/1988 |
| 4704561 | Push-pull generator A push-pull generator with a driver stage and a push-pull output stage. A parallel connection of a resistor (R3, R4) with a control transistor (T3, T4) is provided in the base line of each output stage transistor. In the push-pull output stage, resistors ... | 11/03/1987 |
| 4611150 | Load responsive inverter for electroluminescent lamp An inverter for providing power to an electroluminescent lamp which optimizes the light output over the life of the lamp, includes an oscillator and a voltage feedback for sensing the voltage across the electroluminescent lamp, the oscillator being respon... | 09/09/1986 |
| 4593347 | Blocking oscillator switched mode power supply An improved blocking oscillator switched mode power supply, which is protected against a voltage rise on the primary side of a transformer of the switched mode power supply, which occurs in a no-load operation and could endanger the circuit. In a design o... | 06/03/1986 |
| 4564820 | Blocking oscillator converter with controlling logic system A blocking oscillator converter with controlling logic system has an oscillator which, in the active state, blocks control of a switching transistor of the converter, and hence feeding of the electronic apparatus to be supplied by the converter. The oscil... | 01/14/1986 |
| 4524411 | Regulated power supply circuit A regulated switched-mode power supply for a television receiver utilizes a high voltage power transformer. A transformer primary winding, energized in response to a pulse width modulated signal, energizes electrically isolated load circuit windings via t... | 06/18/1985 |
| 4464613 | Blocking oscillator for a reciprocating electromagnetic actuator A blocking oscillator for a reciprocating electromagnetic actuator having a solenoid coil, a detection coil for generating a control signal in response to a charge in the magnetic field generated by the solenoid coil, a silicon Darlington amplifier respon... | 08/07/1984 |
| 4459653 | Apertured transformer and inverter using same A bifluxer type transformer for use in a static inverter utilizes an E-E or shell-type core. Such configuration is particularly suitable for ballasting hid lamps because it minimizes stray flux which causes eddy current losses in the luminaire metal enclo... | 07/10/1984 |
| 4447776 | Pulse driver for flux gate magnetometer A driver circuit for a fluxgate magnetometer has a repetition rate controble independent of the magnetometer core winding inductances, and a current-ON interval terminated only by core saturation. In this manner, power consumption is greatly reduced as c... | 05/08/1984 |
| 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 |
| 4443838 | Regulated single-ended self oscillating, DC-DC converter A switching regulator having a blocking oscillator including a transistor, and a transformer with primary, secondary, and positive feedback windings. A rectifying and smoothing circuit is connected to the load and includes a photodiode coupled to a photot... | 04/17/1984 |
| 4417217 | Discharging element energizing circuit for discharge-type fire alarm sensor unit A discharging element energizing circuit for a discharge-type fire alarm sensor unit including a discharging element, wherein a power supply circuit gives a power voltage to the discharging element in the form of periodical output pulses making same ready... | 11/22/1983 |
| 4404497 | Power supplying apparatus This invention concerns to a power supply arrangement which comprises, substantially, a power source circuit, a voltage converter circuit for converting a direct current voltage from the direct current power source circuit into an alternating current volt... | 09/13/1983 |
| 4384254 | Oscillator/driver circuit for fluxgate magnetometer A low power expenditure oscillator/driver circuit including a transistor drive and control windings connected thereto and being operatively wound on a magnetic core suitable for use in a fluxgate magnetometer is disclosed. Its low power expenditure feat... | 05/17/1983 |
| 4379253 | Ornamental lamp and method and apparatus for operation thereof An ornamental lamp which includes a light transmitting envelope containing a fluid such as an inert gas or air and at least one electrode disposed within or without said envelope and applying high voltage at a high frequency to said electrode to ionize th... | 04/05/1983 |
| 4378585 | Free-running blocking oscillator-type converter A free-running blocking oscillator-type converter for producing a controlled output signal. The converter is provided with a primary winding of a transformer, a switching transistor, and a resistor which are connected in series with one another between fi... | 03/29/1983 |
| 4363005 | Power conserving blocking oscillator power supply circuit A power source circuit for a discharge type sensing circuit, comprising a blocking oscillator (1 ) and a feedback circuit (2) for changing the period of oscillation of the blocking oscillator (1). The sensing circuit as a load is connected to a secondary ... | 12/07/1982 |
| 4350971 | Circuit for use in the detection of the condition of an isolated switch contact A tire pressure monitoring system includes a tuned circuit with a pressure sensitive switch which is closed when the tire pressure is normal, connected across it, the tuned circuit and switch being mounted on the vehicle wheel. Mounted on a part of the ve... | 09/21/1982 |
| 4330736 | Compensated current feedback oscillator ballast for fluorescent lamps and the like A power source for operating gas discharge lamps and other loads at high frequency, typically utilizing a dc source or a rectified ac source to produce a high frequency output. An inverter with oscillator circuit and first transformer has the secondary or... | 05/18/1982 |
| 4322724 | Low voltage operated electric circuits An electronic device comprises an arrangement which makes it possible to power a transmitter in self-contained fashion from a pick-up without any other power source. The device comprises at least one transistor and a transformer having a high turns ratio.... | 03/30/1982 |
| 4274044 | DC-DC Converter for charging a battery by means of a solar cell A DC-DC converter is described of the blocking oscillator type, for charging a battery from a solar cell. The use of a field effect transistor enables the oscillation to be started by the voltage from a single solar cell, even if the battery is fully exha... | 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 |
| 4258338 | Pulse generator producing short duration high current pulses for application to a low impedance load The present invention deals with a pulse generator for generating short duration, high current pulses at a repetition rate which is substantially independent of variations in source potential, load or ambient temperature. The pulse generator employs a sin... | 03/24/1981 |
| 4251753 | Power supply circuit for strobo unit A power supply circuit for strobo unit includes a DC-DC converter which steps up a low voltage from a d.c. source to a higher voltage. The converter comprises an oscillation transformer, a PNP transistor and an NPN transistor, both of which are used to fo... | 02/17/1981 |
| 4228382 | Power regulating inverter circuit A means for regulating the power of a fluorescent tube in a vehicle supplied by a DC source by providing the control circuit of an oscillator transistor of an inverter with an adjustable RC circuit. Even very much dimmed tubes can be lighted with the use ... | 10/14/1980 |
| 4228405 | Load activated normally quiescent waveform generator There is disclosed a novel compact power oscillator which is normally quiescent until applied to a load, to produce, under load, a unique waveform which has a unique application to self-protective devices and medical uses. The oscillator includes a high g... | 10/14/1980 |
| 4223195 | Pulse transformer A pulse transformer is provided for triggering a magnetron in a microwave oven from a low level d.c. control signal. A step-up transformer has a secondary connected to a magnetron triac and a primary connected to a blocking oscillator circuit. The blockin... | 09/16/1980 |
