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8947056 Control circuit for step-up switching regulator  
A switching transistor is arranged between a switching (SW) terminal and the ground terminal. An error amplifier amplifies the difference between the feedback voltage VFB that corresponds to the...
8730689 Capacitive power supply  
A capacitive power supply including an input section having input terminals for connection to an AC-mains supply, and a capacitive coupling, a rectification section coupled via the capacitive...
8552680 Power management circuit and electronic device using the same  
An electronic device includes a first rechargeable battery, a solar cell mounted on the electronic device, a second rechargeable battery and a power management circuit. The power management...
8450993 Semiconductor buck circuit with floating-voltage suppression shunting current load  
The present invention relates to a conventional circuit connected with the direct-current (DC) power supply in series through the semiconductor forward voltage drop, for producing voltage drop to...
8193785 Power supply  
A switching regulator for regulating an ac signal, and method of supplying power thereto wherein the regulator includes a positive half cycle part and a negative half-cycle part arranged to...
8053997 Load control device having a trigger circuit characterized by a variable voltage threshold  
A two-wire load control device, such as a dimmer, is operable to control the amount of power delivered to an electrical load, such as a magnetic low-voltage (MLV) load, and comprises a...
8004233 Solar powered DC load system  
The solar powered direct current (DC) load system is a reliable, versatile and user friendly system; it uses solar energy and rechargeable battery powering at least one type of DC load which are:...
7847512 Solar powered DC load system  
The solar powered direct current (DC) load system is a reliable, versatile and user friendly system; it uses solar energy and rechargeable battery powering at least one type of DC load which are:...
7834607 Voltage generator with current limiting and semiconductor testing device  
A voltage generator with current limiting generates a voltage to be fed to a load of which load current is limited. The voltage generator includes an operational amplifier; an output resistance...
7602158 Power circuit for generating non-isolated low voltage power in a standby condition  
A power circuit generating a non-isolating low voltage power supply using a capacitive AC voltage drop in standby. Specifically, the power circuit includes an AC connector that generates a first...
7579813 Power regulator having a voltage regulator module and having a voltage buffer module to provide a constant voltage output  
A power regulator with a constant-voltage output is provided, which includes a voltage regulator module and a voltage buffer module, wherein the voltage regulator module is spaced from a load by...
7245511 Resistor dropper power supply with surge protection  
A power supply system and corresponding methodology is provided for providing a self-protected power supply for use with electronic electricity meters. The self-protecting features are provided,...
6275013 Switching power supply employing an internal resistance in series with a zener diode to stabilize a DC output  
A switching power supply includes a rectifying and smoothing circuit 6 coupled to an inductor L1 and a zener diode D2 coupled to the output of the rectifying and smoothing circuit 6. An internal...
6222350 High temperature voltage regulator circuit  
A high voltage shunt regulator circuit includes a high voltage device with a predetermined reverse-conduction threshold connected in series with a thermal compensation device comprising a...
6061577 Electrical power supply circuit, in particular for portable appliances  
An electricity power supply circuit for an external appliance whose consumption varies over time. The circuit comprises an electrochemical cell, a supercapacitor serving as a source of electricity...
5701071 Systems for controlling power consumption in integrated circuits  
Systems for controlling the current consumption of an integrated circuit chip and the like so as to reduce the inductive voltage drops occurring over the power supply lines within the chip and...
5568043 Dual voltage generation circuit  
A dual voltage generation circuit, responsive to a switching signal, to selectively generates a constant voltage at an output terminal is provided. The generation circuit comprises a switch...
5457623 High efficiency power converter having diode-controlled switching frequency for illumination loads  
A high power, high efficiency power converter for illumination loads, with low heat dissipation. In the preferred embodiment, the converter utilizes a switching means pair providing a high...
5304861 Circuit for the detection of temperature threshold, light and unduly low clock frequency  
A detection circuit that does not vary with the supply voltage is formed by measuring the voltage generated at the terminals of a diode (1) which is reverse biased and is supplied by a constant...
5291365 Power supply with overvoltage protection circuit  
First, second, and third power supply lines are separate from each other. A power supply circuit receives electric power from the first power supply line, and generates a given power supply...
5252908 Apparatus and method for temperature-compensating Zener diodes having either positive or negative temperature coefficients  
An auto-TC voltage reference wherein an operational amplifier receives at one input the voltage of a Zener diode and at its other input receives a compensation signal from a feedback circuit...
5227963 Flat-top waveform generator and pulse-width modulator using same  
A three-phase flat-top waveform generator which may be utilized in a pulse-width modulator. Transfer function means receive a three-phase input signal and produce therefrom a zero sequence signal....
5027165 Buried zener diode  
An improved zener diode formed in a semiconductor wafer having a primary surface, the zener diode having a PN junction buried beneath the surface. The diode includes a pair of spaced contacts on...
4994731 Two wire and multiple output Hall-effect sensor  
A device for sensing the speed of a rotating element in a vehicle replaces the practice of using magnetic wire coil pickup devices placed in close proximity to a rotating element, such as a gear....
4982316 Polyphase full-wave rectifying circuit  
A polyphase full-wave rectifying circuit that is connected to a polyphase AC line having a neutral point includes DC output terminals and plural pairs of rectifying elements. Each pair is composed...
4982318 DC power supply having bipolar outputs  
A DC power supply which is adapted to produce a DC main voltage between a main output terminal provided at one end of a first line and a ground terminal provided at one end of a second line; the...
4868907 Self-biased scorotron grid power supply and electrostatic voltmeter operable therefrom  
An electrophotographic system including a corona charging device for applying a charge to a surface and having a coronode driven to a corona producing condition; a conductive grid interposed...
4794277 Integrated circuit under-voltage lockout  
A low voltage lockout circuit preferably of integrated circuit form to provide a lockout signal when an internally generated reference voltage is insufficient. According to the present invention,...
4774452 Zener referenced voltage circuit  
A zener diode is connected at one end via a first impedance to a first power terminal. The base-to-emitter junctions of first and second transistors are connected in parallel between the other end...
4764716 Stabilizing circuit for a microcomputer  
A stabilizing circuit for the operating voltage of a microcomputer, in which the input of the circuit is connected to a power supply, and the output of the circuit is connected to the operating...
4748533 Integrated circuit for the protection of subscriber lines against overvoltages  
An integrated circuit for protecting subscriber lines against overvoltages includes a semiconductor body; a field-controllable thyristor having a gate electrode, an anode electrode and a cathode...
4701835 Multimode flashlight  
A flashlight which can be operated directly either by a rechargeable batt or by a hand-cranked alternator. The alternator can also simultaneously operate the light and recharge the battery, or...
4695784 Voltage and current limiting phase-triggered battery charger with continuous optimization of charging rate  
A battery charging circuit includes a silicon controlled rectifier full wave bridge that has its input connected across a conventional 60 hertz alternating current power line. The output of the...
4686449 JFET current source with high power supply rejection  
A JFET current source compensates for variations in the voltage supply to intain a constant current level at its output terminal. Series connected diodes are used as voltage dividers in...
4668903 Apparatus and method for a temperature compensated reference voltage supply  
A voltage reference supply circuit is described that provides temperature compensation over a wide range of temperatures. The circuit includes a plurality of thermistor temperature dependent...
4665355 Off line capacitor-divider power supply for solid state power controller  
A solid state power controller off-line capacitor divider power supply coupler between an ac voltage source output terminal and neutral terminal, supplying regulated dc voltage levels referenced...
4657347 Liquid crystal display with zener diode  
A liquid crystal display apparatus includes a liquid crystal display device having a plurality of display digits, a one-chip microcomputer having a plurality of voltage terminals for driving the...
4639551 Regulated power supply circuit particularly for telephone set  
The invention relates to power supply circuits, and in particular those used for directly supplying, from a telephone line, the bell or other items in a telephone set. In order to avoid...
4609863 Power supply providing stabilized DC from an input voltage of AC superposed on DC without disturbing the input voltage  
This power supply device comprises a voltage regulating element, a constant-current source, first and second constant-current circuits, and a current switching circuit interposed between the first...
4608529 Constant voltage circuits  
A constant voltage circuit has two rails 10 and 12, with one rail 12 at a variable potential V, possibly supplied by a voltaic cell. In one arm between the rails there is voltage reference means...
4603289 Dual input voltage regulator  
The invention is a dual input voltage regulator that has four active parts: a transistor, a resistor, a zener diode and a capacitor. It has one input for main power and one input for turn on...
4591728 Transformerless power unit  
A transformerless power unit for an electronic apparatus, preferably a horological instrument, including a fluorescent display, with a compensating resistor network which is connected with one...
4580206 Voltage clamp regulator  
A 12 volt input is supplied to a timer providing a square wave output with an approximately 50% duty cycle. The output is applied to the bases of a pair of transistors and the collectors of the...
4562400 Temperature-compensated zener voltage reference  
A precision voltage reference comprising an IC chip having a Zener diode connected to the input of an operational amplifier. Variations in output with temperature are minimized by selectively...
4524317 Precision, dynamic low voltage measurement system  
A voltage divider used to supply multiple reference voltages is energized electrically, in shunt, by a constant voltage generator and, in series, by a constant current generator. The magnitude of...
4417198 Average responding RMS indicating type transducer  
Transducers of the average responding RMS indicating type are disclosed that are particularly useful for monitoring currents and voltages in a power distribution network. The transducer includes...
4398142 Kelvin-connected buried zener voltage reference circuit  
An improved voltage reference circuit is provided comprising a series combination of a Kelvin-connected buried zener diode and a transistor. The collector of the transistor is connected to the...
4390829 Shunt voltage regulator circuit  
A series shunt regulator circuit suitable to be fabricated in monolithic circuit form for providing a regulated output voltage and having a low input to output voltage differential thereacross....
4378521 Active zener diode substitute circuit  
A circuit which performs regulator or limiter functions at current and voltage levels below the operating ranges of conventional zener diodes. The output of an op amp is connected through a diode...
4356502 Protection circuit for a semiconductor device  
A protection circuit for a semiconductor substrate comprises a semiconductor substrate of a first conductivity type, a first region of a second conductivity type formed in the semiconductor...

Matches 1 - 50 out of 84 1 2 >