358 results about "Diode bridge" patented technology

A thermostat is operable from battery, common-wire (“C-wire”), or furnace relay power. The thermostat includes a power source selector, such as a jumper wire, that is set when the thermostat is installed in a heating system. In a gas millivolt heating system, the thermostat operates off of battery power. In heating systems having a C-wire, a diode bridge converter converts alternating-current voltage to direct-current voltage to provide operating power to the thermostat. In heating systems without a C-wire and having sufficient furnace relay current, a triac converter in series with the furnace relay provides voltage spikes to the diode bridge converter to provide operating power to the thermostat when the furnace is on, and the diode bridge converts AC to DC voltage when the furnace is not on. The thermostat can also be used in cooling systems and heating, ventilation, and air-conditioning systems. Thus, the thermostat can be used in a wide variety of applications.

An electronic thermostat circuit has improved power stealing for controlling an AC control device. The circuit comprises a source of AC control power coupled to an electronic switch means having an electronic switch means control input. The electronic switch means controls the AC control device. The diode bridge controls the electronic switch means by a DC control signal applied to the diode bridge means DC connection. The amplifier means has an amplifier input for controlling the state of the amplifier and an amplifier output for generating the DC control signal. An isolated gate FET means is electrically coupled to the amplifier input for controlling the state of the amplifier. The isolated gate FET means is powered by the current derived from the source of AC control power by power stealing. The digital signal controls the state of the AC control.

Energy harvesting systems and methods that use multiple piezoelectric generators connected to the same energy harvesting circuit with minimal or no energy loss. The piezoelectric energy harvesting system may include individual diode bridge circuits electrically connected to the outgoing wires from each piezoelectric generator. The piezoelectric energy harvesting system may include multiple subsystems each having one or more individual diode bridges electrically connected to the outgoing wires from multiple piezoelectric generators. Multiple subsystems, each having multiple piezoelectric generators and a diode bridge, may be electrically connected to the same energy harvesting circuit. The use of multiple piezoelectric generators connected to the same energy harvesting circuit results in improved energy harvesting capabilities, and a simplified and low cost energy harvesting system.

A self test (ST) ground fault circuit interrupter (GFCI) provides a half wave rectifier for powering circuitry for determining and annunciating end of life (EOL) of the GFCI regardless of a shorted diode bridge or opening of a printed circuit board (PCB) trace. A fuse resistor is provided to open before an open PCB trace can occur. A microprocessor-controlled heat-conducting circuit is provided adjacent to a thermal fuse to controllably open the thermal fuse and remove power from face receptacle contacts and load terminals when EOL occurs.

A system is presented. The system includes a first micro-electromechanical system switch. Further, the system includes arc suppression circuitry coupled to the first micro-electromechanical system switch, wherein the arc suppression circuitry comprises a balanced diode bridge and is configured to facilitate suppression of an arc formation between contacts of the first micro-electromechanical system switch.

Single-phase to three-phase converter comprising a rectifier stage, a DC link and an inverter stage, wherein the rectifier comprises a filter choke, one controllable switch for power factor correction, rectifying diodes arranged in a diode bridge configuration having input terminals and output terminals, the controllable switch being connected to the output terminals of the diode bridge, an upper blocking diode arranged between the positive output terminal of the diode bridge and the positive input of the DC link and a lower blocking diode arranged between the negative output terminal of the diode bridge and the negative input of the DC link, the DC link comprises a capacitor bank connected between the DC link, which capacitor bank has a center point. The inverter stage comprises three phase outputs, two of which are formed with a series connections of controllable switches arranged between the DC link for switching either positive voltage or negative voltage of the DC link to the phase outputs, and one phase output is formed of the voltage of the center point of the capacitor bank, and in that the center point of the capacitor bank is configured to be optionally connected to the neutral line of the single-phase AC input by using a connection switch element providing thereby doubled voltage to the DC link.

A matrix converter may be provided with AC switches that comprise bi-directional sets of semiconductor switches that are gated with a common gating link. A low loss diode-bridge based snubber may facilitate introduction of time delay between sequential operations of the bi-directional set of semiconductor switches. The matrix converter may be operated in a three-phase mode with only one gating signals for each AC switch, in contrast to prior-art matrix converters which may require use multiple gating signals for each AC switch.

An electromagnetic array includes a plurality of axially spaced electromagnets deployed in a non-magnetic housing. The array further includes an electrical module, such as a diode bridge, configured to provide an electrical current having a fixed polarity to at least the first electromagnet in the array. The array may be configured to generate a magnetic field pattern having (i) a single magnetic dipole when the array is energized with an electrical current having a first polarity and (ii) at least one pair of opposing magnetic poles when the array is energized with an electrical current having the opposite polarity. The invention provides multiple independent ranging methodologies for determining the relative position between the wellbores.

The invention relates to a full-solid-state direct-current circuit breaker of a direct-current power distribution network. The full-solid-state direct-current circuit breaker is characterized in that the direct-current circuit breaker is formed by connecting an auxiliary circuit breaker loop, a main circuit breaker loop and an energy absorption loop in parallel, and the auxiliary circuit breaker loop comprises a thyristor switch unit and a modularized full control device switch unit, and the thyristor switch unit and the modularized full control device switch unit are connected in series; the main circuit breaker loop comprises a plurality of press fit full control device switch units, a lightning arrester and a fuser, and a diode bridge type structure is adopted for two-way through flow; the energy absorption loop comprises at least one lightning arrester. The full-solid-state direct-current circuit breaker is novel in topology structure and comprehensive in function, the on-state loss is small in normal operation, the current state can be fast detected, faults can be effectively recognized, two-way current can be cut off in faults, the current turn-off grade is high, the fault removal speed is high, the voltage and energy absorption effect is good in the turn-off process, the rate of rise of fault current is effectively limited, and the series-connection valve banks of the main circuit breaker loop and the full control device of the auxiliary circuit breaker loop can be reliably protected.

An AC-to-DC adapter may be provided in order to increase the sensitivity of a touch-sensitive surface. Such an AC-to-DC adapter may include a rectifying circuit to rectify incoming AC signals. The rectifying circuit may take the form of a diode bridge network that includes four diode branches. Stabilization circuits may be provided in parallel with each diode branch in order to decrease the impedance of the diode bridge network during particular periods of operation. The stabilization circuits may be configured such that the impedance of the diode bridge network is substantially constant during all periods of operation. As a result, the impedance of the AC-to-DC adapter may be relatively constant during all periods of operation. In turn, the sensitivity of a touch-sensitive surface of a device being powered by such an AC-to-DC adapter may increase.

Choppers are provided respectively in the output stages of two diode bridges, and their output sides are connected in parallel to a smoothing capacitor. By controlling the operations of the two choppers, the currents which are allowed to be inputted to the diode bridges are made triangular waves of mutually opposite phases, or middle-phase waveforms of three phases.

A system is presented. The system includes a micro-electromechanical system switch. Further, the system includes a balanced diode bridge configured to suppress arc formation between contacts of the micro-electromechanical system switch. A pulse circuit is coupled to the balanced diode bridge to form a pulse signal in response to a fault condition. An energy-absorbing circuitry is coupled in a parallel circuit with the pulse circuit and is adapted to absorb electrical energy resulting from the fault condition without affecting a pulse signal formation by the pulse circuit.

A power factor correction converter in a buck-boost configuration may include a set-up circuit configured to supply an input voltage, a buck transistor connected to the set-up circuit, and configured to receive a current from the diode bridge, a first diode connected to the buck transistor, a boost transistor, a resistor connected to the boost transistor, a coil that connects the buck transistor and the boost transistor, a buck-boost PFC regulator connected to the set-up circuit, and configured to regulate a time pattern of the on/off status of the first transistor and the second transistor synchronously, a second diode connected to the coil and the boost transistor, and configured to output a first level voltage, a capacitor connected to the second diode and a load connected to the second diode.

Circuits provide power to network-based devices, such as IP telephones, using spare conductors within existing LAN cables. The circuits, which may comprise diode bridges, are designed to provide power using existing and planned industry guidelines.

A low-cost PFC converter capable of detecting an inductor current including a DC component and performing appropriate correction of a power factor with low loss includes a diode bridge that rectifies an AC voltage input from an AC input power supply Vac, a series circuit including an inductor and a switching element, a rectifying and smoothing circuit that is connected in parallel to the switching element and that includes a diode and a smoothing capacitor, and a digital signal processing circuit that performs on/off control on the switching element so that an input current input from the AC input power supply Vac has a similar waveform with respect to an AC voltage. A current flowing through the inductor during an off period of the switching element is detected using a current detecting resistor, and a decreased voltage of the current detecting resistor is sampled at the middle of the off period of the switching element, thereby detecting an average value of the input current.

A device and a method for the control of a generator, for example a claw-pole generator, with which the rectifier bridge connected to the generator can be temporarily short-circuited, as a result of which power is temporarily stored in the stator inductors, which results in higher phase voltages. Suitable selection of the control frequency for a transistor, which makes the short-circuiting of the diode bridge possible, allows an output voltage of the generator to be set to the desired voltage level which is clearly higher than the conventional vehicle electrical system voltage. The diode bridge itself can be replaced by controllable switching elements (transistors) and a voltage adjustment is implemented using suitable controls.

The invention discloses a medical B-ultrasound front-end excitation device, comprising a FPGA-based transmitted beam main control unit, a multi-channel high-voltage switch circuit, a level conversion and high-voltage driving pulse circuit, a high-voltage excitation generating circuit, an isolation diode bridge and the control signal circuit thereof. In the invention, an apodization bipolar transmission circuit is adopted, thereby overcoming the characteristics of the beam and the limitation of the spectrum transmitted by the traditional B-ultrasound front-end system which uses unipolar high-voltage pulse. By using a energy distribution apodization excitation technology which is near Gaussian shape, the characteristics and side lobe suppression of the transmitted beam are effectively improved; thereby not only improving the utilization of transmission energy, but also effectively improving the detection penetration when the transmission high-pressure is unchanged. The excitation device can obtain obvious variable frequency effect, and improve the image resolution, so that the image is more uniform and finer, and the overall performance of the system is enhanced.

A circuit for harvesting electrical energy from a piezoelectric source and for storing the electrical energy in a battery includes an inductor that is configured to store electrical energy. A diode bridge-free switching network is configured to: direct electrical energy from the piezoelectric source to the inductor during a first portion of a piezoelectric charge generating cycle; and direct electrical energy from the inductor to the battery during a second portion of the piezoelectric charge generating cycle.

A medium voltage adjustable frequency drive includes an input isolation transformer having a three-phase input and a three-phase output, a converter having a three-phase input electrically connected to the three-phase output of the input isolation transformer and an output providing a direct current bus, an inverter having an input electrically connected to the output of the converter and a three-phase output, and a pre-charge circuit. The pre-charge circuit includes a ferro-resonant transformer circuit having a primary winding structured to input a low voltage and a secondary winding structured to output a medium voltage and provide a constant current source. The pre-charge circuit also includes a medium voltage diode bridge having an input receiving the medium voltage from the secondary winding of the ferro-resonant transformer circuit and an output structured to provide the constant current source to the direct current bus.

An interface circuit for a lamp ballast includes first and second input power lines, L1 and L2, with first and second respective switches, and a neutral power line N, all coupled to a diode bridge. Closing one of the first or second input power lines L1 or L2 causes a photodiode in an opto-isolator coupled to the diode bridge to turn ON, which in turn causes a MOSFET in a control circuit to be in an open state. When in the open state, a first resistor coupled to the source of the MOSFET is included in the control circuit and causes a lamp attached thereto to operate in a dimmed state. When both input power line switches are closed, L1 and L2 are both coupled to the diode bridge and thereby cause the phototransistor to be in an OFF state, which causes the MOSFET to close, thereby including a second resistor, coupled to the drain of the MOSFET, in the control circuit in parallel with the first resistor. This in turn causes the lamp to operate at full intensity.