57results about How to "Reverse flow" patented technology

An improved switching regulator for implantable medical devices includes a control circuit with a capacitor divider to conserve energy, and selectable duty cycles to efficiently match the duty cycle to the charge level in a holding capacitor. The switching regulator charges the holding capacitor to commanded voltage levels, and the holding capacitor provides current for tissue stimulation. The commanded voltage level is reached by “pumping-up” the holding capacitor with the output of the switching regulator. For control purposes, the high voltage (i.e., the voltage across the holding capacitor) is divided between a fixed capacitor and a variable capacitor, and the voltage between the fixed capacitor and the variable capacitor (i.e., the divided voltage) is compared to a reference voltage. The result of the comparison is used to turn-off the switching regulator once the commanded voltage level is reached. The switching duty cycle is set to one of two values. At start-up, or when the output voltage drops below a determined threshold, a low duty cycle is used. Once the output voltage reaches the threshold, a higher duty cycle is used.

A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An induction motor is coupled to the output of the inverter stage for driving a compressor in the chiller/refrigeration system. The ride-through method comprises operating the active converter to regulate the DC link voltage of the DC link stage to a predetermined voltage level until the current through the active converter equals a predetermined current limit, then transferring regulation of the DC link to the inverter upon reaching the current limit of the converter. The compressor is unloaded, and the power flow through the inverter is reversed to maintain the voltage level of the DC link stage.

An IV line temperature controlled warming device includes a housing and a fluid cassette or cartridge that receives fluid from an IV line and includes intravenous line tubing arranged in a preformed configuration. The configuration includes tubing sections arranged in generally circular and concentric portions and a central serpentine tubing section that basically reverses fluid flow and facilitates flow in opposing directions within adjacent tubing sections. The fluid cassette is retained within the device on a base plate partially disposed within a device housing interior, while a housing cover is selectively opened and closed to permit access to the base plate. The base plate includes a heater plate disposed thereon, while the cover and heater plate each include heating elements to apply heat to opposing surfaces of the tubing cassette. The heating elements are controlled by a controller in response to measured temperatures of the heater plate and fluid.

A control circuit for a switching power supply reacts to an over current condition in the switching power supply to bring its operating point to a safe condition. The control circuit senses both the direction and the magnitude of the load current in the switching power supply, and then uses this sensed information to control the active power switches in the switching power supply. In an over current condition, the switches are controlled to actively drive the load current toward zero, even if the sensed information is delayed or heavily filtered, or the switch signals from the control circuit are delayed in reaching the switches. The resulting operation of the switching power supply is more resistant to abnormal load conditions and is maintained in the presence of transient short circuits or arcs. The switching power supply hardware is also better protected.

A clot capture catheter comprises an elongate tubular shaft having a proximal end, a distal end and an inflatable expansile member at the distal end. The expansile member is inflatable from a collapsed delivery configuration to an expanded configuration. In the expanded configuration, the expansile member extends to define a funnel shape having an enlarged distal clot entry mouth at the distal-most end of the catheter. In the expanded configuration, the expansile member may extend distally beyond the distalmost tip of the shaft. The expansile member may be integral with the distal tip of the catheter shaft.

A water control valve designed to control the flow of water from a source to a treatment tank having a plurality of treatment media, thereby providing a supply of treated water, and also provides other cycle controls. For instance, the water control valve directs water to backwash the media of sediment for discharge to a drain, permits regeneration of the media by directing a regeneration agent through the media, directs water through the media in a fast rinse cycle, and directs water to a regeneration agent reservoir for the purpose of refilling the reservoir. The water control valve has six valves and five motors for controlling the valve positions. The valves are fluidly connected to six chambers providing a pathway for water flow between the valves, to a regeneration injection assembly, through a central passageway or a perimeter passageway, to the treatment tank.

The invention discloses a bi-directional dual-input SEPIC direct-current converter and a power distribution method of the bi-directional dual-input SEPIC direct-current converter. The bi-directional dual-input SEPIC direct-current converter comprises a first SEPIC pulse current source unit, a second SEPIC pulse current source unit and an output filter circuit. The first SEPIC pulse current source unit comprises a first input direct current voltage source A, a first power switch tube M1, a second power switch tube M3, a first inductor L1, a second inductor L3 and a first capacitor C1. The second SEPIC pulse current source unit comprises a second input direct current voltage source B, a third power switch tube M2, a fourth power switch tube M4, a third inductor L2, a fourth inductor L4 and a second capacitor C2. The first SEPIC pulse current source unit and the second SEPIC pulse current source unit are connected in parallel, and the output filter circuit comprises an output filter capacitor C. The power distribution method includes power distribution and load feedback power control which are carried out on the two input direct current voltage sources. The bi-directional dual-input SEPIC direct-current converter and the power distribution method of the bi-directional dual-input SEPIC direct-current current have the advantages of being complex in circuit structure, capable of achieving boost and voltage reduction, wide in adjusting range of output voltage, capable of achieving energy feedback, small in loss, high in circuit efficiency, small in ripple in output voltage waveform and capable of being used on a large current occasion due to connection of two current sources in parallel, and an isolation transformer is not needed.

The invention provides a process apparatus and associated method comprising at least one elongate hollow semi-permeable member, at least one anode and at least one cathode. The anode and cathode are arranged radially and concentrically with respect to the semi-permeable member.

The invention relates to a shape of a combustion chamber for a direct-injection diesel engine, in which a mixture in, particularly, an expansion stroke is promoted by optimally designing the shape of the combustion chamber, and further, the compatibility between PM reduction and NOx reduction can be achieved by improving a retardation limit and speeding up combustion at a high EGR. The inside of a combustion chamber 12 formed at a top of a piston is formed in such a manner that a vertically cross-sectional shape passing a center axis O2 inside of the combustion chamber is symmetric with respect to the center axis. Furthermore, an opening 18 at an upper end of the combustion chamber 12 is formed into a substantially polygonal shape in combination of round portions 21 and straight portions 22.

A semiconductor device for power supply control generating and outputting a driving pulse for performing control to turn on/off a switching element by inputting voltage in proportion to current in the primary-side winding wire and an output voltage detection signal from a secondary side, the device including: a high-voltage input start terminal to which alternating-current voltage of AC input or rectified voltage is input; voltage comparison circuits to which voltage obtained by dividing voltage input to the high-voltage input start terminal is input and which compare the input voltage with any of reference voltages; a timer circuit which starts to measure a predetermined time at a timing of rising and/or falling of output of the voltage comparison circuits; and a discharging unit between the high-voltage input start terminal and a ground point, wherein the discharging unit is made conductive when the predetermined time is measured.

In a monolithic air conditioner, a front panel is mounted on a front of a cabinet and includes an indoor air intake, an indoor air outlet, and a discharge guide backwardly extended from the indoor air outlet. An indoor heat exchanger is mounted on a back of the front panel. An air guide on which the indoor heat exchanger is mounted includes an orifice in a center to pass sucked indoor air therethrough. A scroll is mounted on a back of the air guide to guide the sucked indoor air. An indoor fan is mounted between the scroll and the air guide to suck the indoor air. A shroud is mounted on a back of the scroll to guide sucked outdoor air and it defines an orifice in a center to discharge the sucked outdoor air. An outdoor fan is mounted on a back of the shroud to suck the outdoor air, a fan motor is mounted on the scroll to drive the indoor and outdoor fans, and an outdoor heat exchanger is mounted on a back of the outdoor fan to exchange heat with the sucked outdoor air.

The invention discloses a two-way two-input CUK direct-current converter and a power distribution method thereof. The two-way two-input CUK direct current converter comprises a first CUK impulse voltage source unit, a second CUK impulse voltage source unit and an outputting filter circuit. The first CUK impulse voltage source unit comprises a first input direct-current voltage source A, a first power switch tube M1, a second power switch tube M3, a first inductor L1 and a first capacitor C1. The second CUK impulse voltage source unit comprises a second input direct-current voltage source B, a third power switch tube M2, a fourth power switch tube M4, a second inductor L2 and a second capacitor C2. The outputting filter circuit comprises an outputting filter inductor L and an outputting filter capacitor C. The power distribution method includes performing power distribution and load feedback power control on the two input direct-current voltage sources. The two-way two-input CUK direct-current converter and the power distribution method thereof have the advantages that the circuit structure is complex, output polarity is reversed, voltage increasing and decreasing can be realized, range of output voltage regulation is large, energy feedback can be realized, loss is low, the circuit is efficient, ripple wave in output voltage waveform is small, isolation transformers are not needed and the like.

Provided is a dual-direction dual-input ZETA/SEPIC direct-current converter and a power distribution method of the dual-direction dual-input ZETA/SEPIC direct-current converter. The direct-current converter comprises a ZETA impulse voltage source, an SEPIC impulse current source and an output filtering circuit. The SEPIC impulse current source comprises a first input direct voltage source A, a first power switching tube M1, a third power switching tube M3, a first inductor L1, a second inductor L2 and a first capacitor C1. The ZATA impulse voltage source comprises a second input direct voltage source B, a second power switching tube M2, a fourth power switching tube M4, a third inductor L3 and a second capacitor C2. The ZETA impulse voltage source is embedded into the SEPIC impulse current source. The output filtering circuit comprises an output filtering capacitor C. The power distribution method includes the steps of conducting power distribution and load feedback power control on the two input sources. The dual-direction dual-input ZETA/SEPIC direct-current converter and the power distribution method of the dual-direction dual-input ZETA/SEPIC direct-current converter can achieve voltage boosting, voltage reduction and energy feedback, are high in circuit efficiency, allow the converter not to be isolated, and are suitable for small and medium-size power new energy joint power supply systems.

The invention discloses a bidirectional double-input BUCK/BUCKBOOST dc converter and a power distribution method thereof. The dc converter is composed of a BUCK pulse voltage source, a BUCKBOOST pulse current source and an output filter circuit, wherein the BUCK pulse voltage source comprises a power supply and a half-bridge switch block, the BUCKBOOST pulse current source comprises a power supply, a power switch tube and an inductor, and after the BUCK pulse voltage source is embedded into the BUCKBOOST pulse current source, a load is supplied via a filter C. The power distribution method comprises power distribution and load feedback power control is carried out on two input sources, wherein when the required power of the load is greater than the power provided by the power source A, the power source B is discharged; and when the required power of the load is lower than the power provided by the power source A, the power source B is charged. The dc converter and the power distribution method of the invention are characterized by capability of stepping voltage up/down, inversion of output polarity, large adjusting range of output voltage, energy feedback, low loss and high circuit efficiency, etc.

An hydraulic system comprising an air sucking hydraulic circuit 8, an air sucking control valve 5, and a check valve 6 provided in or before and after the air sucking hydraulic circuit 8, allowing a flow of a hydraulic fluid from the air sucking control valve 5 to the hydraulic actuator 4 and preventing a flow of a hydraulic fluid from the hydraulic actuator 4 to the air sucking control valve 5.

An active switch for electrically connecting and disconnecting a power source such as an energy harvester to a charge storage device is disclosed. The active switch allows a minimal amount of reverse back current flow from the charge storage device to the power source and zero quiescent current from the charge storage device to the active switch having a high off-resistance.

The sea water hydraulic electrically controlled one-way valve includes: sea water electromagnet with magnetic core barrel connected with holed end cap and no-hole end cap separately on two ends; magnetic core tube assembly with armature push rod extending beyond the assembly; winding assembly outside the magnetic core tube assembly and with casing, end cap and sealing rings; one-way valve with valve body, which has oil port A, throttle hole, valve core and jump ring, oil port B and oil hole; and armature push rod capable of contacting with the small end of the valve core. The present invention may be used as common one-way valve and can realize back flow under control of signal.

The invention discloses a contaminated water purification treatment device which comprises a housing, wherein the housing is partitioned into N aerobic tanks, N-1 anaerobic pools, two filtering basinsand two water inlet/outlet tanks, wherein the aerobic tanks and the anaerobic pools are adjacently arranged in sequence; the two filtering basins are respectively adjacent to the aerobic tanks at twoends; the two water inlet/outlet tanks are respectively arranged at two ends of the housing and are adjacent to the corresponding filtering basins; the two water inlet/outlet tanks are respectively provided with a drainage pump, a drainage pipe and a drainage bottom pipe; a water inlet control valve and a water inlet distribution pipe are arranged at the bottom of the water inlet/outlet tanks; aerating apparatuses are arranged at the bottoms of the aerobic tanks; the upper parts of the aerobic tanks are communicated with the anaerobic pools; a plurality of water inlets are formed in the bottoms of the anaerobic pools or on side faces close to the bottom; N is a natural number not less than 2. The contaminated water purification treatment device disclosed by the invention has the advantages that anaerobic-aerobic (A/O), UNITANK, multipoint water inflow and biological aerated filter treatment processes are organically combined, high-efficiency nitrogen and phosphorus removal of the contaminated water is realized, and the treatment device is low in manufacturing and operating cost and high in treatment efficiency.

A wall-brushing device includes spread coating cylinder, coating transfer pipelines which one end is connected with paints-storing tubular and another end is connected with spread coating cylinder, the coating transfer pipelines are equipped with bellows pump and its driving motor, and it also includes inverse flow pipelines which one end is connected with coating transfer pipelines and another end is connected with paints-storing tubular, the inverse flow pipelines are equipped with governing valve; the governing valve includes valves of liquid inlet mouth and liquid outlet mouth, the valve body also includes valve cavity connecting liquid inlet mouth and liquid outlet mouth, the valve cavity is equipped with spools which controls liquid inlet mouth and liquid outlet mouth and is conducted with valve cavity, the front end of the spool is conflicted with the connecting position of liquid inlet mouth and valve cavity, the contact position forms sealing face, the end is connected with the rear end of valve through preloading spring. The beneficial effects of the invention are: 1. the motor and the transportation pump operate continuously and so the frequent start and stop are avoided. 2. The practical and new device realizes limiting maximum discharge pressure and adjusting the paints flow transferred into spread coating cylinder simultaneously.