71 results about "Capacitive power supply" patented technology

A capacitive power supply circuit, comprising a power storage element between two output terminals for providing a rectified output voltage; in series between a first input terminal for applying an A.C. voltage and a first of the output terminals, at least one capacitor and a first diode; a switch controllable by application of a signal on a triggering terminal; and means for controlling said switch to the on state when the output voltage is in a predetermined range of values.

The present invention provides an inductive power supply for producing well-regulated noise-free supply of power suitable for sensitive equipment from a power transmission line. In an embodiment of the invention, the inductive power supply can be easily and safely attached to a high voltage transmission line for retrieving low voltage, AC or DC power. The inductive power supply utilizes an inductor, which is also known as a current transformer, to retrieve power from the transmission line. Energy storage components such as super capacitors may be optionally employed to store energy for later use. The electrical output of the power supply is a regulated low voltage output to power a load, e.g., sensitive electronics such as wireless devices and other microelectronics. The power supply further includes a sealed compartment for housing various types of low power devices coupled to the regulated low voltage output.

A dimmer control system has a communication control loop that connects a master unit in series with a plurality of remote units, and it is superimposed in series on the dimmer load line so as to allow two-way communication between the master unit and remote units without affecting the operation of the load. Communications from the master to the remote units are encoded in loop current fluctuations, whereas communications from any remote to the master unit are encoded in loop voltage fluctuations. The master unit has a switched power supply, for use during normal LOAD ON operation, in tandem with a capacitive power supply, for use during LOAD OFF operation of the control units so as to minimize hum. The master unit power supply circuit provides an output rail voltage comprised of a reference voltage for the load superimposed with a control loop voltage for the voltage drop across the series-connected remote units. The master unit has a POWER OFF detection circuit and a non-volatile memory for storing system status information, so that when power is restored, the system can be restored to its former power level. The switch units are formed with a cover frame mounting a switch plate on a hinge axis allowing ON/OFF movement of an opposing side thereof. An array of LED light pipes is mounted in the switch plate aligned with the hinge axis, in order to minimize displacement of the light pipes during actuator movement.

A dimmer control system has a communication control loop that connects a master unit in series with a plurality of remote units, and it is superimposed in series on the dimmer load line so as to allow two-way communication between the master unit and remote units without affecting the operation of the load. Communications from the master to the remote units are encoded in loop current fluctuations, whereas communications from any remote to the master unit are encoded in loop voltage fluctuations. The master unit has a switched power supply, for use during normal LOAD ON operation, in tandem with a capacitive power supply, for use during LOAD OFF operation of the control units so as to minimize hum. The master unit power supply circuit provides an output rail voltage comprised of a reference voltage for the load superimposed with a control loop voltage for the voltage drop across the series-connected remote units. The master unit has a POWER OFF detection circuit and a non-volatile memory for storing system status information, so that when power is restored, the system can be restored to its former power level. The switch units are formed with a cover frame mounting a switch plate on a hinge axis allowing ON/OFF movement of an opposing side thereof. An array of LED light pipes is mounted in the switch plate aligned with the hinge axis, in order to minimize displacement of the light pipes during actuator movement.

A dimmer control system has a communication control loop that connects a master unit in series with a plurality of remote units, and it is superimposed in series on the dimmer load line so as to allow two-way communication between the master unit and remote units without affecting the operation of the load. Communications from the master to the remote units are encoded in loop current fluctuations, whereas communications from any remote to the master unit are encoded in loop voltage fluctuations. The master unit has a switched power supply, for use during normal LOAD ON operation, in tandem with a capacitive power supply, for use during LOAD OFF operation of the control units so as to minimize hum. The master unit power supply circuit provides an output rail voltage comprised of a reference voltage for the load superimposed with a control loop voltage for the voltage drop across the series-connected remote units. The master unit has a POWER OFF detection circuit and a non-volatile memory for storing system status information, so that when power is restored, the system can be restored to its former power level. The switch units are formed with a cover frame mounting a switch plate on a hinge axis allowing ON/OFF movement of an opposing side thereof. An array of LED light pipes is mounted in the switch plate aligned with the hinge axis, in order to minimize displacement of the light pipes during actuator movement.

A main power source supplies current through path impedance to a power terminal of an integrated circuit device under test (DUT). The DUT's demand for current at the power input terminal temporarily increases following edges of a clock signal applied to the DUT during a test as transistors within the IC switch in response to the clock signal edges. To limit variation (noise) in voltage at the power input terminal, an auxiliary power supply supplies an additional current pulse to the power input terminal to meet the increased demand during each cycle of the clock signal. The magnitude of the current pulse is a function of a predicted increase in current demand during that clock cycle, and of the magnitude of an adaption signal controlled by a feedback circuit provided to limit variation in voltage developed at the DUT's power input terminal.

A capacitor-type power supply unit including:

• • a positive bus to which a plurality of capacitor is connected in parallel at each positive-electrode terminal thereof with maintaining equal intervals therebetween, and extends in a parallel direction; and an negative bus to which the plurality of capacitor is connected in parallel, at each negative-electrode terminal thereof with maintaining equal intervals therebetween, and extends in the parallel direction, in which the positive bus has a positive-electrode-side external connection part that is set at a position (SD) separated from the positive-electrode first end by a range of 20% to 30% of the total length in the longitudinal direction thereof, and the negative bus has an negative-electrode-side external connection part that is set at a position (SD) separated from the negative-electrode second end by a range of 20% to 30% of the total length in the longitudinal direction thereof.

The invention discloses a capacitor clamping-based trilevel railway power regulator which comprises two single phase transformers, two output reactors, a capacitor clamping trilevel power module and a direct-current side voltage sharing circuit, wherein primary sides of the two single phase reduction transformers are connected with two power supply arms in a three-phase tractive power supply system respectively, and secondary sides of the two single phase reduction transformers are connected with the capacitor clamping trilevel power module; and the voltage sharing control circuit is adopted at the direct current side, and the voltage of the direct-current side capacitor is shared through a small-capacity switching element and an inductor, thus the reliability of the device is improved. Compared with an RPC (remote procedure call), only one pair of high-power switching arms, two clamping capacitors and a group of direct-current side capacitors are needed, thus the capacitor clamping-based trilevel railway power regulator has the advantages of reducing the original active capacity cost, reducing the hardware cost and complexity of the compensation system in the premise of achieving the same functions, and improving the reliability of the compensation system.

The invention discloses a high speed railway tractive power supply system for a distributed photovoltaic power supply and a control method. A photovoltaic array implements maximum power tracing, boost and inversion through a photovoltaic inverter, alternating electric energy with a low voltage grade output by the single phase photovoltaic inverter is boosted through a photovoltaic boosting transformer and then is led into the tractive power supply system; and the high-voltage side of the photovoltaic boosting transformer is connected with a contact net output port of an autotransformer an a midpoint. Due to adoption of a single phase grid connection technology, electric energy quality of the high speed railway tractive power supply system can be improved; electric energy sent by the distributed photovoltaic power supply first meets traction load requirements; when there is redundant electric energy, the redundant electric energy is sent back to a power system, and grid connection of the photovoltaic electric energy is implemented; in addition, a high speed railway is large in rate of traffic flow, an operation time interval of the high speed railway and a power generation peak time interval of the distributed photovoltaic power supply are high in goodness of fit, and a photovoltaic electric energy absorptive problem is solved.

A capacitive power supply including: a first capacitive element and a first resistive element in series between a first terminal of a power switch and at least one rectifying element having a second terminal connected to a first electrode of at least one second capacitive element for providing a D.C. voltage; and a bidirectional switch in parallel on the resistor.

A charger circuit for providing a charging current and voltage to a battery includes a power delivery unit, a capacitive power conversion circuit and a reverse blocking switch circuit. The power delivery unit converts an input power to a DC voltage and current. The capacitive power conversion circuit includes a conversion switch circuit including plural conversion switches coupled with one or more conversion capacitors, and a conversion control circuit. The DC current is regulated to a predetermined DC current level, and the conversion control circuit controls the connections of the plural conversion capacitors such that the charging current is scaled-up of the predetermined DC current level substantially by a current scale-up factor. The reverse blocking switch circuit is coupled in series with the capacitive power conversion circuit. The body diode of the reverse blocking switch is reversely coupled to the body diode of the conversion switch.

A DC-DC switching converter with an LC output filter has a switched capacitor converter providing the capacitance of the output filter. The switched capacitor converter may be a multi-phase switched capacitor converter. Topology of connections between capacitors of the multi-phase switched capacitor converter may be dependent on phases of clock signal(s) provided to the multi-phase switched capacitor converter. The switched capacitor converter may rely on parasitic inductances, or include discrete inductors, in series between connected capacitors to allow for adiabatic or near adiabatic voltage conversion.

The utility model provides a be used for providing a charging current's charging circuit to a battery, contains a power transmitting element and a capacitanc power switching circuit. This power transmitting element is a direct current output current and adjusts this direct current output current accurate in a predetermined output current position with an input power switching over, this capacitancpower switching circuit includes a change over switch circuit that has a plurality of change over switch, its with one or a plurality of changeover condenser be coupled, an and conversion control circuit, for in a plurality of conversion period, correspond these a plurality of change over switch of operation, make this one or a plurality of changeover condenser periodically correspond and be coupled in one or a plurality of partial pressure node, this direct current output voltage, and between this ground point a pair of node wherein, and via this one or a plurality of partial pressure node in a node produce this charging current, wherein this charging current's position standard roughly is the flow increasing multiple of the accurate acquiescence in this predetermined output current position. The utility model discloses still provide to be used for charging circuit's capacitanc power switching circuit.

Advantage is taken of the fact that in optical navigation devices it is possible to measure the intensity of light impacting the pixel array of photo-diodes. Based upon such an intensity determination, a feedback signal is used to reduce the intensity of the light to a point where it is equal to or less than a predetermined value. In one embodiment, the discharge rate of a capacitive power supply is used to determine the intensity of the light source impacting the pixels. When the discharge rate is faster than a given amount the inference is that the light intensity is too great and power is reduced to the light source to reduce the intensity.

The invention relates to the technical field of power supply detection, in particular to a power switch state detection circuit for a floating ground wire BUCK type switch power supply. The floating ground wire BUCK type switch power supply comprises a power supply body VIN1, a power supply body VIN2, a switch S1, a switch S2, a diode D1, a diode D2, a power tube N1, a Schottky diode SD1, an inductor L1, a PWM control and power tube driving circuit, a first ground wire and a second ground wire. The power switch state detection circuit comprises an NMOS tube N2, a resistor R3, a sampling hold circuit, a negative power supply generating circuit and a voltage comparator. According to the power switch state detection circuit, the switch state is detected only in the conduction time period of the power tube, the leakage current of the diodes is small in the switch state detection time period, the detection resistance can be selected to be large, so that the power loss of the resistors is reduced, the working efficiency of a system is improved, meanwhile, the leakage current does not change along with the voltage of the power supply of the system, and the system does not generate errorsalong with the change of the voltage of the power supply.

An adaptive power supply span powers devices used in telecommunications. It includes a power circuit and control circuit that receives power and sense signals therefrom and provides a control signal thereto and distinguishes between a first network interface load having a constant voltage input power requirement and a second network interface unit load having a constant current input power requirement. A voltage control circuit and current control circuit are interconnected together and connected to the power circuit. A control signal from the voltage control circuit and current control circuit extends to the power circuit. The control circuit maintains a fixed output voltage for constant voltage regulation for the first network interface unit load, if the output current remains below a threshold current. The circuit limits the output current to a regulated value for constant current regulation below the initial maximum value for powering a second network interface unit if the initial output current is greater than the threshold current for a time greater than a threshold time.

The invention discloses a capacitive power supply method and a capacitive power supply device based on a high-voltage electric field. According to a theory that the high-voltage electric field exists between two phases of a high-voltage line or between a high-voltage power transmission line and the ground, a metal body with a proper size is put at a proper distance position between the two phases of the high-voltage line or between the high-voltage power transmission line and the ground, so that two series equivalent capacitors are formed between the metal body and the two phases of the high-voltage line, or two series equivalent capacitors are formed between the metal body and the high-voltage power transmission line as well as between the metal body and the ground; energy of the electric field can be obtained by voltage share of the two series equivalent capacitors; the obtained energy is stored and accumulated; and when reaching a certain value, the accumulated electric energy is supplied to loads with low power consumption, such as a micro processor, a wireless transceiver and the like. A new technical measure is supplied to solving the problem of power supply to high-voltage accessory equipment; the device has a simple structure and a small volume, and is portable; the method is easy to implement; and the high-voltage line safety rule can be met.

Disclosed are antenna ports for high-speed, short-range, capacitive wireless devices that can be used for stream data and power supply transmission between two adjacent electronic devices, modules, etc. In various embodiments, differential capacitive antenna ports for the wireless capacitive signal reception and transmission include a capacitive transmission port configured to generate electric fields that represent transmitted signals with at least one pair of transmitting terminals, with conductive working surfaces connected to the port inputs at the input feed points, and a capacitive reception port configured to detect electric fields that represent transmitted signals with at least one pair of receiving terminals, with conductive working surfaces connected to the port outputs at the output feed points.