46results about How to "Suppress voltage rise" patented technology

Disclosed is a novel compound useful as a constituent of an organic EL device. Also disclosed is a practical organic EL device using this compound. This organic EL device has low driving voltage, long life, and reduced leakage current. Specifically disclosed is a compound characterized by having at least one structure (1) shown below in a molecule. Structure (1)

Provided is a high-reliability level shift circuit not prone to faulty operation due to noise. A level shift circuit 1 is provided with: first and second current control elements 12a and 12b into control terminals of which a reverse-phase input signal and an in-phase input signal are input, respectively; first and second load circuits 13a and 13b which are connected at one end to a high-side power source terminal Vb and at the other end to each of first terminals of the first and second current control elements 12a and 12b; a comparator 14 in which a pair of differential input terminals Np and Nn are connected separately to each of the first terminals of the first and second current control elements 12a and 12b; a current generating circuit 3 in which first and second current output terminals Na and Nb are connected to second terminals of the first and second current control elements 12a and 12b, and which separately generates a current which flows through the respective first and second current control elements 12a and 12b; and voltage suppressing circuits 15a and 15b which are connected separately or commonly to the first and second current output terminals Na and Nb, respectively, and suppress voltage from rising in the first and second current output terminals Na and Nb, respectively.

In a direct-current power supply device that includes a smoothing capacitor C1, which performs a DC / DC converter operation, a transformer T1, a switching element Q1, a diode D2, a smoothing capacitor C2, a reactor L1, which performs a PFC operation, a fast recovery diode D1 and a switching element Q1, when compared with the case of a rated load, the voltage of the smoothing capacitor C1 of a PFC circuit rises at a time when a load is light. Therefore, the following has been required: a capacitor having a sufficient withstanding voltage rating, or an operation of connecting a plurality of capacitors in series or any other operation to secure a voltage-withstanding capability.A direct-current power supply device 1, in which a switching element Q1 used by a PFC circuit is shared as a switching element Q1 by a DC / DC converter, includes voltage suppression means (switching elements Q2 and Q3 and resistance R2) for supplying electric charge accumulated in a smoothing capacitor C1 to a power supply Vcc of a control circuit CTL1 that controls the switching element Q1 at a time when a load is light in order to suppress a rise in voltage in the smoothing capacitor C1.

To provide an organic EL element having high efficiency and long life, without accumulating holes at the interface between a light-emitting layer and a layer on the cathode side, and an organic light-emitting device.An organic EL element having a light-emitting layer between an anode and a cathode, wherein the light-emitting layer contains a light-emitting material and a charge-transporting material, the element has a hole relaxation layer adjacent to the cathode side of the light-emitting layer, the hole relaxation 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 type of the charge-transporting material and at least one type of the hole-relaxing material are the same organic compound; and an organic light-emitting device containing such an element.

A DC-DC converter includes a plurality of switch elements connected in series between both ends of a DC power source, a series circuit of a primary winding of a transformer and a capacitor, connected between a connection point of the plurality of switch elements and an end of the DC power source, a rectifying-smoothing circuit to rectify and smooth a voltage generated by a secondary winding of the transformer into a DC voltage, and a controller to change a switching frequency of the plurality of switch elements according to a feedback signal generated from the DC voltage and alternately turn on / off the plurality of switch elements. The controller includes a nonlinear response unit 11a to nonlinearly change the switching frequency according to a feedback amount represented by the feedback signal.

An inverter control device for controlling a rotating electric machine drive device that drives an alternating current rotating electric machine and includes an inverter and a DC link capacitor, the inverter being connected to a DC power supply via a contactor, being connected to the rotating electric machine, and performing power conversion between direct current and three-phase alternating current, the DC link capacitor smoothing a DC link voltage, which is a DC-side voltage of the inverter, and the inverter control device performing switching control on switching elements that form the inverter.

Single channel digital addressable lighting interface (DALI) systems can include a dedicated external power supply that operates in a constant voltage / constant current mode to meet requirements of the DALI bus. A lighting controller is powered from the DALI bus. In one embodiment of the inventive subject matter, a lighting system is provided that includes two or more control (e.g., DALI) buses and a multichannel power supply that can be used for powering a controller of the system with constant voltage and to power separate control buses with separate and constant current. In order to protect the controller and buses from overloads caused by miswiring or other erroneous conditions, a protection circuit assembly is provided.

A material for an organic electroluminescence device including an indenofluorenedione derivative shown by the following formula (I):wherein X1 and X2, which may be the same or different, are any of specific divalent groups; R1 to R10, which may be the same or different, are a hydrogen atom, an alkyl group, an aryl group, a heterocycle, a halogen atom, a fluoroalkyl group, an alkoxy group, an aryloxy group or a cyano group; and R3 to R6 or R7 to R10 may be bonded to each other to form a ring.

A material for an organic electroluminescence device including an indenofluorenedione derivative shown by the following formula (I):wherein X1 and X2, which may be the same or different, are any of specific divalent groups; R1 to R10, which may be the same or different, are a hydrogen atom, an alkyl group, an aryl group, a heterocycle, a halogen atom, a fluoroalkyl group, an alkoxy group, an aryloxy group or a cyano group; and R3 to R6 or R7 to R10 may be bonded to each other to form a ring.

Provided is an ESD protection device wherein, even in the case of repeated electrical discharge, it is difficult for an increase to arise in discharge start voltage and discharge protection voltage, and furthermore it is difficult for scorching or peeling to occur at the tip of a discharge electrode. A cavity (3) is formed within an insulating substrate (2). In the cavity (3), a first and second discharge electrode (4, 5) are disposed in a manner so that the tips (4a, 5a) face each other separated by a gap. A first external electrode (9) is formed at the outer surface of the insulating substrate in a manner so as to be electrically connected to the first discharge electrode (4), and a second external electrode (10) is formed at the outer surface of the insulating substrate (2) in a manner so as to be electrically connected to the second discharge electrode (5). The thickness of the tips (4a, 5a) of the first and second discharge electrodes (4, 5) is relatively thicker than the remaining portion of the first and second discharge electrodes.

A method for driving a motor including a stator wound with a coil and a rotor rotatably disposed and confronting the stator, whereby the coil is energized and driven at energizing timing of which phase is determined based on an advance angle amount to rotate the rotor. At this time, it is determined whether or not a power supply voltage supplied to the motor exceeds a predetermined voltage, and when it is determined that the power supply voltage exceeds the predetermined voltage, the advance angle amount is changed to increase a current amount flowing through the coil, for energizing and driving the coil.

This invention provides a motor drive circuit, which makes it possible to prevent braking when a power supply voltage is lower than a predetermined voltage while suppressing at a low cost a rise in a voltage on a power supply line when a kickback occurs. The motor drive circuit is formed to include first and second power supply lines connected with and shunted from a power supply, an H-bridge circuit, and a means to control the H-bridge circuit. The means controls the H-bridge circuit so that a regeneration path is not created in the H-bridge circuit when the power supply voltage is lower than a predetermined voltage.

An electroplating cell includes: (i) an anode chamber in which an anode chamber solution is stored; and (ii) a separator that includes a base material and an organic plating additive contained in the base material, separates the anode chamber and a cathode from each other, and selectively allows permeation of metal ions contained in the anode chamber solution.

A material for an organic electroluminescence device including an indenofluorenedione derivative shown by the following formula (I):wherein X1 and X2, which may be the same or different, are any of specific divalent groups; R1 to R10, which may be the same or different, are a hydrogen atom, an alkyl group, an aryl group, a heterocycle, a halogen atom, a fluoroalkyl group, an alkoxy group, an aryloxy group or a cyano group; and R3 to R6 or R7 to R10 may be bonded to each other to form a ring.

An electric motor drive device (100) is provided with a smoothing capacitor (4) and an inverter (1), and also provided with an overvoltage protection unit (6) for protecting the smoothing capacitor (4) from overvoltage, and a phase short-circuit control unit (12). The overvoltage protection unit (6) is provided with: a discharge circuit (20) in which a discharge resistor (7) and an IGBT (9) are connected in series; and a first determination circuit (21) for determining with a determination delay that a smoothing capacitor voltage exceeds a first set voltage and turning on the IGBT (9). The phase short-circuit control unit (12) is provided with a second determination circuit (13) provided in a control device (5) for drive-controlling the inverter (1) and determining with a determination time longer than the determination delay of the first determination circuit (21) that the smoothing capacitor voltage exceeds a second set voltage lower than the first set voltage, thereby performing a phase short-circuit control on the inverter (1).

A method for driving a motor including a stator wound with a coil and a rotor rotatably disposed and confronting the stator, whereby the coil is energized and driven at energizing timing of which phase is determined based on an advance angle amount to rotate the rotor. At this time, it is determined whether or not a power supply voltage supplied to the motor exceeds a predetermined voltage, and when it is determined that the power supply voltage exceeds the predetermined voltage, the advance angle amount is changed to increase a current amount flowing through the coil, for energizing and driving the coil.

A cascode current mirror circuit is connected as an active load to the input differential pair. A tail current source supplies a tail current to the input differential pair. A constant current source is connected in parallel with the input differential pair, and supplies a constant current to the tail current source. The constant current supplied by the constant current source is set to a value at which a transistor is not cut off.

Provided are an organic electroluminescent element having a long lifetime and preventing a voltage rise and a decrease in efficiency after driven for a long time, a display and a lighting device both of which include the element. The organic electroluminescent element includes a luminescent layer sandwiched between an anode and a cathode, and a plurality of organic layers including the luminescent layer. The luminescent layer contains a phosphorescent compound and host compounds A and B both of which satisfy the following equations and requirement (11). Host Compound A=X+nR1, Host Compound B=X+mR2; and (11) [HOMO Energy level of Host Compound A]−[HOMO Energy level of Host Compound B]≥0.15 eV.

A constant current-constant voltage circuit includes a first resistor; a first transistor that is an N-channel type; a second transistor; a third transistor that is a P-channel type; a fourth transistor that is a P-channel type; a fifth transistor; a second resistor; and a first constant voltage element. The second resistor is coupled between the intermediate node and a source of the third transistor and the first constant voltage element is coupled between a source of the second transistor and the second power source line. A bias is set up and a source potential of the first transistor is equal to a source potential of the fifth transistor.

The present invention provides a device and a method for changing over an electric machine from the regular operating mode into the open-circuit mode. In order to avoid excessive increases in voltage and associated adverse effects on the electric machine and the other components, in particular batteries, a further control phase is introduced between the end of the regular operating mode and the freewheeling mode, during which further control phase the voltage at the terminals of the electric machine is continuously adjusted from the voltage previously set in the regular operating mode to the expected open-circuit voltage of the electric machine.

The invention relates to an injection molding machine having an energy-saving device and an inverter. The injection molding machine includes an inverter. The inverter comprises a rectification unit, an inversion unit, a direct current bus, an energy storage unit and an energy-saving unit. Two ends of the direct current bus is respectively connected to a direct current output terminal of the rectification unit and a direct current input terminal of the inversion unit. Two ends of the energy storage unit and the energy-saving unit are respectively connected to a positive busbar and a negative busbar of the direct current bus. And the energy-saving unit includes an energy storage capacitor. In addition, the invention also relates to an inverter. According to the invention, an energy-saving unit is added on an injection molding machine based on control of an inverter, thereby effectively inhibiting building up of a voltage of a bus of an inverter; meanwhile, excess energy is stored; therefore, a brake unit can be omitted and energy can be effectively saved.

An object of the present invention is to provide a Ni alloy anode material for Ni electroplating, which exhibits high plating yield. The Ni alloy anode material of the present invention comprises a Ni alloy consisting essentially of high-purity Ni having purity of 99.99 mass % or higher and, as an alloy component, Si and Al in the following contents: Si: 30 to 300 ppm, and Al: 30 to 300 ppm.

A circuit for automatically compensating beta variation by driving base of BJT with JFET is disclosed. The circuit includes a first well, a second well, a third well, one or more leakage current devices, and a varying metal connection. The first well includes first JFET J1, second JFET J2, third JFET J3 and fourth JFET J4. The input voltage value is combination of emitter to base voltage of first BJT Q1, emitter to base voltage of second BJT Q2. The second well includes first BJT Q1, second BJT Q2 and second diode D2. The third well includes first diode snubber D1. The one or more leakage current devices are connected between base of Q1 and base Q2 to remove excess leakage current across the second well. The varying metal connection is connected across the first well, the second well and the third well to obtain beta value.

The invention discloses an overvoltage suppression protector suitable for a 10kV distribution transformer, and relates to the technical field of power distribution. The overvoltage suppression protector comprises a high-voltage-side arrester (M), a low-voltage-side arrester (N), an overvoltage suppressor (Y), and a grounding resistor (Rd). By utilizing the characteristic of an inductor coil to prevent the current from being abruptly changed, the high-frequency current flowing through the inductor coil is reduced, thereby reducing the leakage ground current. The inductor coil is connected in series with a Rogowski coil. By means of the function of the Rogowski coil for acquiring the high-frequency current signal, the high-frequency current waveform is recorded. Further, the Rogowski coil has a certain capability of suppressing overvoltage, suppresses an overvoltage rise inside the distribution transformer together with the inductor coil connected in series, thereby protecting the distribution transformer against lightning stroke.