61results about How to "Prevent backfeeding" patented technology

A process for detecting and terminating a fault in a photovoltaic device is provided that operates in the millisecond or faster timescale. A process includes measuring a current or voltage in each of a plurality of strings relative to a common rail. When the voltage or current from a string is outside a predetermined threshold, a flag is generated indicating the presence of a fault in the string. A control unit will detect the flag and disconnect the faulty string from the system through a switch. The use of continuously rolling averages of baseline currents and voltages as well as a series of measurements averaged to measure the difference of current or voltage at each step provides a process and a fault detection system that does not suffer from false fault detections thereby providing a reliable and efficient system for detecting and terminating faults in photovoltaic devices.

An automatic transfer switch to automatically electrically connect an electrical panel to a second power source, e.g., an electric generator, during interruption or failure of a first power source, e.g., a utility power supply, includes a powered interlock arrangement that is operative to prevent the electrical panel from being electrically connected to both power sources simultaneously.

The invention relates to a greenhouse intelligent drip irrigation device, which is characterized by comprising a hardware part and a software part; wherein, the hardware comprises six parts of modular design which are a back washing filter mechanism, a material liquid supplying mechanism, a material liquid mixing mechanism, a nutrition liquid drip irrigation mechanism, an electronic control mechanism and a nutrition liquid detection device; wherein, the back washing filter mechanism comprises a back washing device as well as a valve and a pressure sensor which are externally connected; the material liquid supplying mechanism comprises a mother liquor A1 supplying branch, a mother liquor B1 supplying branch and an acid / alkali liquid supplying branch which are connected in parallel; the material liquid mixing mechanism comprises a liquid storage tank as well as an upper cover and a stirring pump matched with the liquid storage tank; the electronic control mechanism comprises two control branches of a pump and a solenoid pilot actuated valve which are controlled by an industrial computer; the software part comprises the procedures of nutrition liquid detection and control; and the control procedure comprises a main procedure, four sub-procedures and a knowledge base.

The embodiment of the invention provides a charging circuit, an electronic device, a charging management method and a storage medium. The charging circuit comprises a wired charging module and a wireless charging module, the wired charging module comprises a first input end, a first output end and a first unilateral conduction unit, the wired charging module is configured to charge a battery connected with the first output end by employing a wired charger connected with the first input end, the first unilateral conduction unit prevents signals from being transmitted to the first input end fromthe first output end; the wireless charging module comprises a second input end, a second output end and a second unilateral conduction unit, the wireless charging module is configured to charge a battery connected with the second output end by employing a wireless charger being in non-contact connection with the second input end, and the second unilateral conduction unit is configured to preventthe signals from being transmitted to the second input end from the second output end. The wired charging module and the wireless charging module can charge the batteries at the same time so as to improve the charging current and shorten the charging time.

An interconnect device is disclosed for detecting whether an vehicle on-board diagnostics (OBD) data port includes a blocking diode or equivalent. that prevents back feeding of power through the OBD data port. If a diode is detected, the interconnect device alerts the user that the power cannot be back fed through the OBD II port connector. In such a condition, an alternate means is used to preserve the data mentioned above. Specifically, an alternative power supply can be connected directly to the battery cables that will be disconnected from the battery, for example, by way of battery clamps. In this way the alternative power supply is used to preserve the data until a new battery is reconnected to the vehicle battery cables. If a diode is not detected by the interconnect device, the interconnect device displays this fact to the user. The interconnect device includes circuitry for detecting and displaying whether a diode is connected in series with a power pin of the OBD II port connector. In addition, the interconnect device includes an OBD II port connector on one end connected by way of a cable to a connector, such as a cigarette lighter connector or hardwired directly to an alternate power supply.

The invention discloses a wet garbage treatment device. The wet garbage treatment device comprises a wet garbage crushing device and a multi-station wet garbage treatment mechanism, wherein the wet garbage crushing device comprises a crushing device positioned below a water outlet of a water tank; the multi-station wet garbage treatment mechanism comprises a fixed disc, a rotating disc and a rotary driving mechanism; a receiving station, at least one extrusion station, at least one drying station and a blanking station are uniformly distributed on the fixed disc in an annular form; a receivingfilter screen is arranged in the receiving station; an extrusion filter screen is arranged in the extrusion station; a drying device is arranged in the drying station; a blanking through hole is formed in the blanking station; garbage treatment buckets are arranged corresponding to the receiving station, the extrusion station, the drying station and the blanking position one by one on the rotating disc; a blanking pipe is arranged above the receiving station; an extrusion device is arranged above the extrusion station; a water receiving and drainage cabin is formed below the receiving stationand the extrusion station; and a wet garbage can is arranged below the blanking station. The invention also discloses a household integrated multifunctional garbage sorting device.

The invention discloses a multi-path power supply management method and multi-path power supply device applied to electronic equipment. Specifically, one path of power supply is selected from multiplepaths of power supply lines according to a priority strategy on the basis of the online condition of each path of power supply; and electric energy is provided for a core module and a peripheral module of the electronic equipment based on a set power-on time sequence. According to the multi-path power supply management method and multi-path power supply device applied to the electronic equipmentof the invention, priority-based power supply switching management and control can be provided for the electronic equipment with multi-path power supply, the power supply stability can be effectivelyensured in different scenes, and the loss of devices of the equipment can also be reduced; moreover, a low-cost hardware architecture optimization scheme which is simple in topological structure and can be implemented through a small number of components is designed while the problem of switching of multiple types of power supplies is solved; the power supply stability and reliability can be obviously improved through the method and device provided by the technical schemes of the invention, and the overall power supply efficiency is greatly improved. The invention further correspondingly discloses electronic equipment applying the multi-path power supply management method or the multi-path power supply device.

The invention discloses a circuit with functions of preventing backflow and automatically switching over a power supply to achieve voltage-loss-free output, and belongs to the technical field of electronics. The circuit comprises a first power supply side, a second power supply side, power supply equipment and a circuit body for automatically switching over the power supply to achieve voltage-loss-free output; the circuit body for automatically switching over the power supply to achieve voltage-loss-free output comprises a voltage reduction device U2, a field effect tube Q1, a field effect tube Q2 and a field effect tube Q3; a positive electrode of the first power supply side is connected with the output end of the U2, the voltage output end of the U2 is connected with the power supply equipment and a drain electrode of the Q1 separately, the grounded end of the U2 is connected with a drain electrode of the Q3, and a source electrode of the Q3 is grounded; a grid electrode of the Q3 isconnected with a grid electrode of the Q1 and a grid electrode of the Q2 separately, a source electrode of the Q1 is connected with a source electrode of the Q2, and a drain electrode of the Q2 is connected with a positive electrode of the second power supply side; negative electrodes of the first power supply side and the second power supply side are both grounded. The circuit makes output voltage continuous when switching over the power supply and guarantees that equipment works stably, loss and damage of devices due to backflow of current can be prevented, so that the output voltage is more stable.

The invention relates to a fixed-frequency synchronous rectification bidirectional DC / DC converter. The converter comprises a transformer, a first power framework arranged on one side of the transformer, a second power framework arranged on the other side of the transformer, a first resonant capacitor arranged between the first power framework and the transformer, and a second resonant capacitor arranged between the transformer and the second power framework. The first / second power architecture is of a bridge structure comprising a plurality of controllable semiconductor switching devices. Theworking frequencies of the first / second frameworks used as the modulation circuit are the same and fixed, and are greater than or equal to the maximum value of the resonant frequencies of the first / second resonant capacitors and the leakage inductance resonance of the transformer. The invention further provides power electronic equipment needing bidirectional energy flow. The power electronic equipment comprises the fixed-frequency synchronous rectification bidirectional DC / DC converter. By controlling the controllable semiconductor switching devices on the two sides of the transformer, the energy conversion efficiency can be improved; energy back-filling can be avoided by setting the working frequency; and the converter and electronic equipment are simple, reliable and high in efficiency.

The invention discloses a floor drain with anti-plugging, anti-backflow, water seal and an insert-and-pull installation structure. The floor drain mainly includes a water collecting tank and a drainage pipe installed in a middle hole of the water collecting tank; the bottom of the drainage pipe is fixedly connected with a water storage cap with an opening upwards, and the water storage cap communicates with the lower part of the drainage pipe; an annular cover plate is connected with the drainage pipe located at the upper end port of the water storage cap in a sleeving mode; the annular coverplate can cover the upper end port of the water storage space precisely under the actions of no water pressure and self-weight or self-elasticity; and under the action of the water pressure, the jointpart of the annular cover plate and the water storage space is opened to enable water to flow out. The floor drain with anti-plugging, anti-backflow, water seal and an insert-and-pull installation structure has the advantages of plugging and back-irrigation proofing, good water sealing effect, simple structure, and easy installation and maintenance.

The invention relates to a portable folding spraying device for a plant protection unmanned aerial vehicle, and discloses a spraying device which can expand the spraying area, is convenient to fold and store, does not interfere with normal flight and landing of the unmanned aerial vehicle, can prevent spray from flowing back to a vehicle body, and guarantees the spraying direction of the spray. The device is characterized in that a rotating sleeve is arranged at the bottom of a rotating connecting base, a rotating motor is arranged on the rotating connecting base, a motor shaft of the rotatingmotor is connected with the rotating sleeve, a connector is arranged on the rotating sleeve, a liquid inlet pipe is arranged on the connector and communicated with the interior of the connector, anda fixed end is arranged at the bottom of the connector in a sleeving mode; a plurality of umbrella rib rods are arranged on a fixed end sleeve at equal angles, the plurality of umbrella rib rods are connected through an umbrella film, a connecting pipe is arranged in the fixed end sleeve, one end of the connecting pipe is communicated with the interior of the connector, and one end of the connecting rod is vertically arranged at the bottom of the fixed end sleeve.

The invention provides a fast frequency variable polarity TIG welding power source and system based on a SiC module. The welding power source comprises a double-path parallel power main circuit, a control circuit and a man-machine interaction system. The double-path parallel power main circuit comprises a three-phase rectification filter circuit, a fast frequency pulse current main circuit and a variable polarity current main circuit; each of the fast frequency pulse current main circuit and the variable polarity current main circuit comprises a primary inverter circuit, a high-frequency transformer and an ultrafast recovery rectification smoothing circuit which are connected in sequence; the fast-frequency pulse current main circuit further comprises a filter inductor and a high-frequency switching circuit which are sequentially connected behind the ultra-fast recovery rectifying and smoothing circuit. The variable polarity current main circuit further comprises a coupling inductor and a secondary inverse current conversion circuit which are sequentially connected behind the ultrafast recovery rectification smoothing circuit. The welding power source can reduce the size, is high in dynamic response speed, low in switching loss, high in energy efficiency and stable and distortionless in output waveform, and can improve the welding quality.

A precise grouting and water plugging method suitable for silty-fine sand and silty-clay stratums comprises the following steps that after a hole is drilled to the designed depth, a drilling rod is withdrawn; the grouting pipe (1) is arranged in the drill hole; a plurality of sets of slurry holes are formed in the positions, at different heights, of the grouting pipe (1) in the circumferential direction of the pipe wall, the grouting process is divided into different engineering sections according to the difference of the height positions of the grouting holes, the part corresponding to the lowest grouting hole is the first engineering section, the grouting holes are sequentially numbered from bottom to top, the part corresponding to the uppermost grouting hole is the Nth engineering section, and N is a positive integer and is larger than or equal to 3; and the grouting construction of the first engineering section to the Nth engineering section is sequentially completed from bottom to top in the grouting process. According to the precise grouting and water plugging method, the slurry pressure loss is small, the grouting channel is not prone to being blocked, and the grouting efficiency is high.

The invention relates to a multi-path high-power power supply method for low-voltage equipment. According to the multi-path high-power power supply method for the low-voltage equipment, multiple external power supplies VCC are used for supplying power for multiple power supply circuits, each power supply circuit comprises two MOS tubes and an MOS tube drive circuit, the two MOS tubes are driven through the MOS tube drive circuit, each power supply circuit controls the connection of the power supplies in a source electrode butt-joint manner of the two MOS tubes, and mutual interference of the power supply circuits caused by backward current flowing is prevented. According to the multi-path high-power power supply method for the low-voltage equipment, the circuit is simple in structure, input interfaces of the multiple power supplies are provided, high-load equipment can be hooked, and backward current flowing can also be prevented; and the multi-path high-power power supply method is applicable for low-voltage multi-stage interconnecting equipment, has the characteristics of low cost, high response speed, stability and reliability, and is suitable for popularization and application.

The invention relates to an active short-circuit protection circuit for an electric drive system of an electric automobile. The active short-circuit protection circuit comprises an exclusive-or circuit for receiving two paths of hardware trigger signals outputted by a main control chip of the electric drive system, wherein the output end of the exclusive or circuit is connected with the second input end of a trigger circuit, the first input end of the trigger circuit is used for receiving a main control chip trigger signal outputted by the main control chip of the electric drive system, the output end of the trigger circuit is connected with the input end of a logical reverse rotation circuit, the output end of the logical reverse rotation circuit is respectively connected with the input ends of a motor driver upper tridrive and a time delay logical reverse rotation circuit, and the output end of time delay logical reverse rotation circuit is connected with a motor driver lower tridrive. According to the active short-circuit protection circuit, the running state of the electric drive system is monitored in real time, a three-phase winding of a motor in the electric drive system can be short-circuited when the system fails and stops working, a drive motor is locked, power generating current is prevented from flowing into a power battery backwards, and the power battery is protected from damage.

The invention discloses a grouper fishery cement pond grading breeding device and method, and belongs to the technical field of fishery breeding. The grouper fishery cement pond grading breeding device comprises a cement pond, a containing pond is connected to the right side of the cement pond, a flood drainage pond is connected to the left side of the cement pond, and a driving mechanism is connected into the containing pond; and pedals are vertically and evenly arranged on the inner wall of the right side of the containing pond, a water pumping assembly is arranged on the inner wall of the flood drainage pond, a monitoring mechanism is arranged on the inner wall of the flood drainage pond, a flood drainage opening is formed in the upper portion of the left side of the cement pond, and apartition plate is movably inserted into the middle of the cement pond. Fries are driven through a driving box, an air blower sends wind power into the driving box through a second telescopic pipe anda conveying pipe in sequence, water in the cement pond is pushed outwards through through holes to be diffused to form water flow, then the fries are driven through the water flow, in cooperation with movement of the driving box, the fry driving efficiency is improved, and the driving box can be prevented from making contact with the fries.

The invention relates to the technical field of wireless charging, in particular to a wireless charging system and a wireless charging device. A power supply unit of the wireless charging system comprises a transmitting coil; a charging unit comprises a receiving coil, a secondary side controller and a rectifier used for being connected with a battery; a first MOS transistor is arranged between the positive electrode of the rectifier and the positive electrode of the battery, and / or a second MOS transistor is arranged between the negative electrode of the rectifier and the negative electrode of the battery; the secondary side controller is in sampling connection with the rectifier and the battery; when an output voltage of the rectifier is lower than a voltage of the battery, the first MOStransistor is controlled to be cut off, so that the backward flowing phenomenon of the battery is prevented; and when the voltage of the battery is negative, the second MOS transistor is controlled to be cut off, so that the reverse connection phenomenon of the battery is prevented. MOS is good in interference resistance and relatively low in power consumption, so that when the prevention of reverse connection and / or backward flowing in wireless charging is realized, the problems of excessively high loss and / or relatively low reliability in the process of realizing the prevention of the reverse connection and / or the backward flowing by adopting a diode or a relay in a current charging technology are solved.

The invention discloses a fault detecting device and method for a static switch of a UPS. The device comprises a pseudo load disposed between an input end of a bypass circuit and the static switch, acurrent sensor for detecting the current of the bypass circuit, a voltage sensor for detecting a voltage of the bypass circuit, and a controller for calculating power. Due to the existence of the pseudo load, when backwash occurs, reverse current and voltage are generated in the bypass circuit. By calculating the reverse current and voltage collected by the current sensor and the voltage sensor, whether the bypass circuit has reverse irrigation phenomenon can be determined, thus whether the static switch is faulty is determined. In addition, the device has a simple structure and is easy to implement, and can be widely applied to UPS. The method for detecting a fault of the static switch for a UPS has the same effect as above.

The invention discloses a discharge circuit for preventing voltages of batteries from flowing backwards and a control method. The discharge circuit comprises a high-voltage direct current output module with a positive electrode and a negative electrode, wherein each high-voltage direct current output module is connected with a corresponding high-voltage direct current distribution unit; a discharge unit is connected between each high-voltage direct current output module and each high-voltage direct current distribution unit in parallel; a first switch K1 and a second switch K2 are arranged on the positive electrode and the negative electrode of each high-voltage direct current distribution unit respectively; the first switch K1 or the second switch K2 is connected with a diode D1 or a diode D2 in series; the negative electrode of the diode D1 is connected with the positive electrode of a battery pack; the positive electrode of the diode D2 is connected with the negative electrode of the battery pack; all high-voltage direct current distribution units all are connected with the battery pack; when a system does not charge a load or the batteries, the voltages of the batteries cannot flow back to input ends due to presence of the diode D1 or the diode D2; and meanwhile, the high-voltage direct current output modules are controlled to be shut down, so that over-zero separation of the high-voltage direct current distribution units K1 and K2 can be achieved; and damage to a device caused by high-voltage and high-current arc discharge is avoided.

The invention relates to a voltage self-following anti-backflow circuit, which comprises N diodes, a PMOS tube and a resistor, the voltage input end of the voltage self-following anti-backflow circuit is connected with the anodes of the N diodes and the drain electrode of the PMOS tube, the voltage output end of the voltage self-following anti-backflow circuit is connected with the cathodes of the N diodes and the source electrode of the PMOS tube, and the grid electrode of the PMOS tube is connected with an external control signal input end. The external control signal input end can output high and low levels to control the on-off of the PMOS tube; one end of the resistor is connected with the source electrode of the PMOS tube, and the other end of the resistor is connected with the grid electrode of the PMOS tube; and the number N of the N diodes is an integer greater than 0. The circuit is applied to a constant-current charging and boost discharging circuit of a battery or a super-capacitor module, reverse charging caused by the fact that leakage current exceeds the standard is prevented, and constant-current charging cut-off voltage and boost discharging voltage can be accurately controlled.

An automatic transfer switch to automatically electrically connect an electrical panel to a second power source, e.g., an electric generator, during interruption or failure of a first power source, e.g., a utility power supply, includes a powered interlock arrangement that is operative to prevent the electrical panel from being electrically connected to both power sources simultaneously.

An electricity backfeed protection assembly is beneficially installed between a main circuit breaker panel of a structure or dwelling, and a utility meter measuring electricity delivered to the structure or dwelling by a utility provider or other primary power source. The electricity backfeed protection assembly includes a contactor having a coil. A contact protector device is electrically connected to the coil of the contactor. The electrical backfeed protection assembly automatically prevents electricity from a secondary power source (including, without limitation, a portable generator) from backfeeding into supply lines of a primary power source (such as utility lines or equipment).

An interconnect device is disclosed for detecting whether an vehicle on-board diagnostics (OBD) data port includes a blocking diode or equivalent, that prevents back feeding of power through the OBD data port. If a diode is detected, the interconnect device alerts the user that the power cannot be back fed through the OBD II port connector. In such a condition, an alternate means is used to preserve the data mentioned above. Specifically, an alternative power supply can be connected directly to the battery cables that will be disconnected from the battery, for example, by way of battery clamps. In this way the alternative power supply is used to preserve the data until a new battery is reconnected to the vehicle battery cables. If a diode is not detected by the interconnect device, the interconnect device displays this fact to the user. The interconnect device includes circuitry for detecting and displaying whether a diode is connected in series with a power pin of the OBD II port connector. In addition, the interconnect device includes an OBD II port connector on one end connected by way of a cable to a connector, such as a cigarette lighter connector or hardwired directly to an alternate power supply.

The invention relates to a direct current output switch circuit, comprising a bus and an output interface in connection with a battery, and also comprising a direct current relay, an anti-reverse diode, a first relay, a second relay, a voltage detector and a master control device. The direct current relay is arranged at the input terminal of the bus; the positive electrode of the anti-reverse diode is in connection with the positive electrode of the bus, and the negative electrode is in connection with one end of a normally open point of the first relay; the other end of the normally open point of the first relay is in connection with the positive electrode of the output interface; one end of a normally open point of a second relay is in connection with the negative electrode of the bus, and the other end of the normally open point is in connection with the negative electrode of the output interface; the voltage detector is in parallel connection between the positive electrode and negative electrode of the output interface; the master control device is in connection with the direct current relay, the first relay, the second relay and the voltage detector. Compared with the prior art, the direct current output switch circuit has the advantages of high safety and stability, great controllability, low cost, wide applicability, etc., and is suitable for connecting with a bus having the rated current of 30 A and direct voltage of 1300V.

A circuit breaker that functions like a double pole double throw (DPDT) switch is used to isolate the commercial power grid from an external power source. When in the “on” position the circuit breaker serves as a main power input circuit breaker allowing power from the commercial power grid to feed into existing wiring. In the “off” position the commercial power grid is disconnected and isolated from the existing wiring. Instead, the switch mechanism is connected to an external power source such as a generator. The generator can be safely operated without risking power backfeed into the commercial power grid.

The invention relates to a drum filter capable of enabling medical intermediate catalysts to be produced conveniently. The drum filter comprises a rotary cylinder, a rack and a motor; a vertical bracket standing on the ground is further arranged on the outer side of a bin; the top end of the vertical bracket is connected with a horizontal transverse bracket; a feeding mechanism is arranged on thetransverse bracket, and the lower end of the feeding mechanism is fixedly connected with an upper scraper; the upper scraper is located above a lower scraper, is parallel to the lower scraper, and meanwhile tangentially makes contact with a filter cake; and the truncation end of the filter cake penetrates through the position between the upper scraper and the lower scraper. The drum filter has thecharacteristics of being easy to unload, low in abrasion degree of the scrapers, capable of effectively preventing the feedback phenomenon, high in cleanliness degree, and small in machine running resistance.

The present invention discloses a low-cost redundant power source control circuit. The low-cost redundant power source control circuit comprises two power conversion circuits, each power conversion circuit comprises one power input end, one filter circuit, one field-effect tube and one power control circuit. The power input ends obtain a smooth voltage through the filter circuits, are connected with the sources of the field-effect tubes and the control ends of the power control circuits and detect the voltage difference of the sources and the drains of the field-effect tubes at the power control circuits, when the field-effect tubes reach a conduction critical point, the power control circuits send control signals to allow the field-effect tubes to perform rapid conduction, the power control circuits and the field-effect tubes output the voltages at the input ends, and the output voltages of the power conversion circuits are mutually mixed. The low-cost redundant power source control circuit is simple in design, low production cost, high in voltage conversion rate and low in power loss, and has wide production and application values in the power technical field.

This disclosure provides systems, methods, and apparatuses for a power control system device housed in a subpanel, that allows for multiple alternative energy inputs as well as providing an islanding feature, which allows a homeowner to receive alternative energy power when the utility power is lost. For example, in a system that includes an electrical service panel main with a main circuit breaker that is connected directly to a utility electrical source, which may have one or more secondary circuit breakers that back-feeds current from an alternative energy source, there is provided an apparatus that: monitors current from both circuit breakers and prevents excess power from overheating the service panel and / or the wiring to the main circuit breaker; may have multiple spaces for circuit breakers that may be connected to multiple alternative energy sources; and may continue to feed specific loads to the home when utility power is lost and one or more alternative energy sources are available.