53results about How to "Avoid voltage rise" patented technology

Even when, for example, electric charge is injected into the output transistor due to external factor such as a noise from the outside, to prevent the step-down voltage from rising, the step-down circuit is comprised of an N channel type output transistor which controls the voltage at the control end, a booster, which is connected to the control end of the output transistor and raises the voltage at the control end and a discharge circuit, which discharges the electric charge at the control end of the output transistor so that the power supply voltage inputted from the input end is stepped down to a desired step-down voltage and outputted from the output end.

A data storage device includes a semiconductor structure including a first conductive-type region having a first-type conductivity, a second conductive-type region spaced apart from the first conductive-type region and having a second-type conductivity opposite to the first-type conductivity, and a semiconductor region between the first conductive-type region and the second conductive-type region and including a neighbouring portion adjacent to the second conductive-type region; a mode select transistor including a gate electrode aligned with the neighbouring portion and an insulation layer between the gate electrode and the neighbouring portion; a plurality of memory cell transistors including a plurality of control gate electrodes aligned with the semiconductor region, and a data storage layer interposed between the plurality of control gate electrodes and the semiconductor region; a first wire electrically connected to the first conductive-type region; and a second wire including an ambipolar contact having a first contact between the second wire and the second conductive-type region, and a second contact between the second wire and the neighbouring portion.

As an activation time power generation mode of a fuel cell system, a control device executes: a first step of determining whether or not hydrogen is present in an anode gas flow path; a second step of bringing a contactor to a connected state if hydrogen is detected in the first step as being present in the anode gas flow path; a third step of supplying air to a cathode through a cathode gas flow path after the second step has been executed; and a fourth step of, if a voltage of the fuel cell stack detected by a voltage detection device reaches a predetermined voltage, connecting an electrical load to the fuel cell stack, and performing electric power generation of the fuel cell stack while maintaining the voltage at or below the predetermined voltage.

A novel intelligent electric flocculation treatment apparatus of power plant coal-containing wastewater is characterized in that the apparatus comprises a coal water primary precipitation tank (1), a secondary precipitation tank (3), a high frequency pulse power supply (7), a vertical electric flocculation box (8), a micro-aeration blower (11), a clarifier (14), a middle water tank (17) and a clear water tank (24), the middle-upper portion of the vertical electric flocculation box (8) is provided with a pole plate (9), the lower portion of the vertical electric flocculation box (8) is provided with a mud hopper (10), coal water goes through an elevator pump (18), enters the vertical electric flocculation box (8) and is electrically flocculated, the electrically flocculated coal water automatically flows into the clarifier (14) and is clarified, the clarified coal water flows into the middle water tank (17), the coal water is conveyed to a valveless filter (19) through a middle water tank elevator pump (18) and is filtered for reuse, an inlet water online turbidity meter (6) is in current connection with the high frequency pulse power supply (7), and the electric flocculation current is automatically adjusted according to the turbidity change of the inlet water. The running of the apparatus can be fully automatically controlled. The apparatus has the characteristics of novel technology, automatic control, stable running, energy consumption and investment cost saving, and substantial environmental and economic benefits.

A DC-DC converter includes a regeneration preventing circuit to bring a synchronous rectifying switching element to an OFF-state when an output of an error amplifier is lower than a lower-limit potential of a triangular-wave signal, that is, when the output of the error amplifier deviates from a voltage range of the triangular-wave signal in a side (direction), which would cause a smaller ON duty ratio of a main switching element. This configuration prevents a rise of voltage in an input side due to a regenerative operation at startup when a pre-bias voltage exists. Also, the configuration prevents fluctuations of an output voltage at a sudden change of a load current and a drop of the output voltage at transition from a soft start state to a normal operation state when the load current is small.

A wind collecting suspension type wind driven generator comprises an air operated machine conical front-and-back fan blade fixing wheel, a generator shell, main fan blades, wind collecting small blades, a carbon brush, a windward device, a circular supporting rod, a positioning wheel, rectangular metal fan blades, a circular supporting rod fixing base, a rectangular metal fan blade rotating shaft, a fixing spring, a fixing nut, a main shaft, a generator shell cover, a silicon steel sheet, a square gear silicon steel sheet peripheral steel belt, a peripheral steel belt gap filling steel sheet, a peripheral steel belt circular fixing spring inserting clamp, a copper ring, a stator coil, a rotor magnetic sheet, a rotor, a fixing pin and a bearing. The fan blades can produce nearly double wind power through a suspension type device and the wind collecting device additionally arranged on the blades, the starting torque is greatly reduced, original manual operation is replaced by mechanical operation, the requirement for the electrical property of a motor is met, the weight can be reduced through an aluminum varnished wire, the materials of an original aluminum outer shell are changed into high temperature resisting plastics, materials are saved, assembling is convenient, and the wind collecting suspension type wind driven generator has good economic benefits and safety performance, saves energy and is free of pollution.

The present invention relates to a semiconductor memory device. A voltage generator for supplying a sense amplifier I/O voltage (VSIO) and a voltage generator for supplying a bit line precharge voltage (VBLP) are independently separated. It is possible to prevent the bit line precharge voltage (VBLP) from increasing when the sense amplifier I/O voltage (VSIO) is increased due to the introduction of a column reset voltage (VCORE).

The invention relates to a cylindrical lithium ion battery pack and a combination method thereof, belonging to the technical field of lithium ion batteries. The cylindrical lithium ion battery pack comprises steel shell batteries (1), connection metal belts (2), strong magnets (3) and overcharge-resistant diodes (4), wherein the connection metal belts (2) are connected between electrodes of the steel shell battery (1) by the strong magnets (3), and the overcharge-resistant diodes (4) are welded on the connection metal belts (2). The combination method of the cylindrical lithium ion battery pack comprises the following steps: (1) a single battery pack is formed by parallel connection, i.e. single cylindrical lithium ion batteries are connected in parallel to form a single battery pack, the single battery pack is pressed using the strong magnet after the connection metal belts are arranged at two edges, and the overcharge-resistant diodes are welded on the connection metal belts; (2) a battery pack is formed by the series connection of the single battery packs, i.e. the single battery packs are connected in series to form the cylindrical lithium ion battery pack. The cylindrical lithium ion battery pack and the combination method thereof have the advantages of simple structure, safety, reliability, good stability, overcharge prevention and the like, and the electrode terminals of the steel shell battery are in reliable and effective connection.

In order to raise the processing yield of vertical-structure LED chips, the present invention provides a novel method for manufacturing the-vertical structure LED chips, which can notably reduce electric leakage of the chips and raise the chip production yield. A P electrode of the chip is formed on the surface of the chip, an N electrode of the chip is bonded with a silicon/copper/tungsten copper alloy substrate, and the P electrode is welded with a support during packaging of the chip. Combination of the ICP etching technique and the hot acid corrosion technology is adopted to form chip isolation channels. A laser spot is adjusted during laser stripping so as to be matched in size with the chip after the isolating channels are formed. An epitaxial wafer is bonded on the silicon/copper/tungsten copper alloy substrate through a high-temperature bonding technique, the ultrasonic technology is then used, and by using internal stress produced in the bonding process and the ultrasonic vibration technology, separation of gallium nitride and the substrate is further raised.

A decorative lamp structure which includes at least one set of light emitting elements, a power connector and a connecting wire. Each set of light emitting elements includes a plurality of light emitting elements spacedly connected in series on the connecting wire. Each light emitting element is connected to a bidirectional diode in parallel. When one or more of the light emitting element is faulty or damaged, the bidirectional diode of the faulty or damaged light emitting element is triggered and turned on so that the light emitting elements in the same set of light emitting elements are capable of working safely at a constant voltage. The connecting wire has two terminals connecting to the power connector respectively. In other words, when one or more light beads fails, the remaining light beads can still work under normal voltage and hence the Christmas decorative lamp structure can still operate safely.

The invention provides a motor braking method and a microcontroller. The motor braking method comprises the steps of N1, determining whether an operation state of a motor is located in a weak magneticregion when a braking instruction is received, if so, executing N2, and if not, executing N3; N2, regulating and controlling a reference current of a direct axis to zero, determining a first PWM waveduty ratio based on the reference current of the direct axis and a collected estimated current, inputting a signal with the first PWM wave duty ratio to a motor, and executing N1; and N3, regulatingand controlling the reference current of a quadrature axis to a preset negative component, determining a second PWM wave duty ratio based on the regulated and controlled preset negative component andthe collected estimated current, and inputting a signal with the second PWM wave duty ratio to the motor till that the motor stops operating. In the scheme provided in the invention, an opposite moment is input to the motor so as to brake the motor, rising of a direct-current bus voltage is avoided, and normal braking of the motor can be guaranteed.

Disclosed are a current transformer for power supply, and a method for manufacturing the same. The current transformer for power supply comprises: a first core formed of a magnetic substance, and having a loop shape with a gap at one side thereof; and a supporting core formed of a magnetic substance, and disposed at one or more sides of the first core so as to block the gap. Accordingly, power supply can be smoothly performed at a small current region, and a power supply subject is prevented from being damaged at a large current region. Furthermore, the number of turns of a coil can be reduced, and an entire size of the current transformer for power supply can be made to be small.

Provided is a power converter which suppresses a current that flows to a capacitor due to a direct current link voltage increase generated by parasitic inductance when a switching a converter is switched in the normal operation. The converter (4) has switching elements, which are connected between a plurality of input terminals (Pr, Ps, Pt) and a direct current power supply line (LH), and switching elements, which are connected between the plurality of input terminals (Pr, Ps, Pt) and a direct current power supply line (LL). A capacitor (C1), a resistor (R1), and a diode (D1) are connected to each other in series between the direct current power supply lines (LH, LL).

The invention discloses an antistatic epitaxial structure and a manufacturing method thereof. The epitaxial structure comprises a buffer layer, an N-type GaN layer, an active layer and a P-type GaN layer which are sequentially arranged on a substrate, characterized in that it is characterized in that it comprises, a composite layer is arranged between the N-type GaN layer and the active layer; thecomposite layer comprises a plurality of silicon concentration changing GaN layers. The silicon concentration change GaN layer comprises a first GaN layer, a second GaN layer arranged on the first GaN layer, a third GaN layer arranged on the second GaN layer, and a fourth GaN layer arranged on the third GaN layer. Wherein the doping concentration of silicon in the first GaN layer is zero, and thedoping concentration of silicon in the second GaN layer and the fourth GaN layer is smaller than the doping concentration of silicon in the third GaN layer. According to the invention, the compositelayer is arranged between the N-type GaN layer and the active layer, and the current can be uniformly distributed to the whole epitaxial structure after passing through the composite layer, so that the current cannot be concentrated on a certain region or point, the antistatic capability of the epitaxial structure is improved, and the active layer is prevented from being broken down by static electricity.

The invention discloses a hydropower station black-start system and method with double-voltage-level wiring. The hydropower station black-start system comprises a first hydro-generator, a three-winding main transformer, a first 500kV circuit breaker, a second 220kV circuit breaker, a first 220kV line, a 500kV circuit breaker, a second 500kV line, a fourth 500kV circuit breaker, a third 500kV line,a high-voltage station transformer and a 10kV station incoming line switch. All switches and knife switches on a black start path are closed, only the circuit breaker for supplying power to a circuitis kept in an off state, a guide vane starting unit is opened by utilizing self energy storage of a hydro-generator, and when the hydro-generator is at a constant speed to a rated rotating speed, anexcitation system control mode is switched into an automatic mode, the hydro-generator with the three-winding main transformer is enabled to build voltage to rated voltage, a working power supply of aplant system is recovered in time, first 220kV line power transmission, second 500kV line power transmission and third 500kV line power transmission are sequentially realized, the black-start capability of a power grid is improved, and the safety of a plant network in coping with extreme conditions is ensured.

Fluorescent material used for a plasma display panel contains particles having various diameters wherein X1/Y is equal to or smaller than 10% where X1 indicates a number of particles having a diameter equal to or smaller than 1.0 micrometers, and Y indicates a total number of particles contained in the fluorescent material.

Disclosed are: an organic EL element in which a hole is not accumulated in the interface between a light-emitting layer and a cathode-side layer and which has high efficiency and a long service life; and an organic light-emitting device. Specifically disclosed are: an organic EL element comprising an anode, a cathode and a light-emitting layer formed between the anode and the cathode, which is characterized in that the light-emitting layer contains a light-emitting material and a charge transport material, a hole-relaxing layer is formed adjacent to the cathode side of the light-emitting layer, the hole-relaxing layer contains a hole-relaxing material, the hole-relaxing material is an organic compound having a hole-transporting unit and an electron-transporting unit, and at least one charge transport material and at least one hole-relaxing material are the same organic compound as each other; and an organic light-emitting device equipped with the organic EL element.

The invention discloses a floating-charge type fireproof lithium iron phosphate battery pack system and a charging method thereof. The floating-charge type fireproof lithium iron phosphate battery pack system comprises a battery box, a lithium iron phosphate battery pack module arranged in the battery box, and a battery management system electrically connected with the lithium iron phosphate battery pack module; the lithium iron phosphate battery pack module is formed by connecting a plurality of lithium iron phosphate cells; a redox shuttle additive is added into the electrolyte of the lithium iron phosphate cells; the redox shuttle additive can convert redundant electric energy into heat energy under continuous constant-current charging; and the lithium iron phosphate cells are connectedin parallel with a battery protection device for playing a balancing role. By using the floating-charge type fireproof lithium iron phosphate battery pack system and the charging method thereof designed by the invention, a system basically has no overcharge condition, the consistency and safety of the system are improved to the maximum extent, and the effects of overcharge prevention and fire prevention are truly achieved.