55results about How to "Voltage change" patented technology

A display driver includes a D / A converter circuit configured to convert display data into a gradation voltage, an amplifier circuit including an input node to which the gradation voltage is input and configured to output data voltage, and a supply circuit configured to supply an auxiliary current or an auxiliary electrical charge to the input node of the amplifier circuit. In an auxiliary period, an output of the D / A converter circuit is in a high impedance state, and the supply circuit supplies the auxiliary current or the auxiliary electrical charge to the input node of the amplifier circuit. In a non-auxiliary period after the auxiliary period, the D / A converter circuit outputs the gradation voltage to the input node of the amplifier circuit.

An electric power converting device can supply a constant voltage to a load while suppressing voltage variation in the AC power source, to reduce breakdown voltages of semiconductor switching elements. The device includes first to third switching element series circuits and at least a first capacitor connected in parallel. One end of the AC power source and one end of the load are connected to each other. Second and third capacitors are connected in parallel to the AC power source side and the load side, respectively. The one end of the power source is connected to a series connection point of the first switching element series circuit through a reactor, the other end of the power source is connected to a series connection point of the second switching element series circuit, and the other end of the load is connected to a series connection point of the third switching element series circuit through another reactor. Change in the power source voltage is compensated by a series converter, which is formed by the second and third switching element series circuits, and change in voltage of the capacitor due to the compensating operation is compensated by charging and discharging operation by a parallel converter formed by the first and second switching element series circuits.

An electric power converting device can supply a constant voltage to a load while suppressing voltage variation in the AC power source, to reduce breakdown voltages of semiconductor switching elements. the device includes first to third switching element series circuits and at least a first capacitor connected in parallel. One end of the AC power source and one end of the load are connected to each other. Second and third capacitors are connected in parallel to the AC power source side and the load side, respectively. The one end of the power source is connected to a series connection point of the first switching element series circuit through a reactor, the other end of the power source is connected to a series connection point of the second switching element series circuit, and the other end of the load is connected to a series connection point of the third switching element series circuit through another reactor. Change in the power source voltage is compensated by a series converter, which is formed byes the second and third switching element series circuits, and change in voltage of the capacitor due to the compensating operation is compensated by charging and discharging operation by a parallel converter formed by the first and second switching element series circuits.

A semiconductor device according to an embodiment of the invention includes: a plurality of field effect transistors; and a plurality of logic circuits composed of the field effect transistors, the field effect transistors each including: first and second drain regions formed away from each other; at least one source region formed between the first and second drain regions; and a plurality of gate electrodes formed between the first drain region and the source region and between the second drain region and the source region.

The drive capability of a logic circuit is improved. The logic circuit includes a first output node, a dynamic logic circuit, a diode-connected first transistor, and a capacitor. The dynamic logic circuit includes a second output node and a plurality of second transistors forming and evaluation circuit. The first transistor and the plurality of second transistors all have one of an n-type conductivity and a p-type conductivity. One terminal of the capacitor is electrically connected to the first output node. The other terminal of the capacitor is electrically connected to the second output node. A first terminal of the first transistor is electrically connected to the first output node. A first voltage is input to a second terminal of the first transistor. The voltage of the first output node is changed by a voltage applied to a back gate of the first transistor.

The invention relates to a phosphorescent material and an organic light-emitting device containing the same, and relates to the field of organic light-emitting materials. The structural formula of thephosphorescent material is as shown in the chemical formula 1. According to the phosphorescent material provided by the invention, a specific heterocyclic ligand is selected for coordination, then the wavelength of the compound is adjusted; so that when the obtained organometallic compound is used for an organic light-emitting device, the light-emitting efficiency of the device is improved, and the service life of the device is long. The phosphorescent material disclosed by the invention can be applied to an OLED light emitting device, and compared with a contrast, the voltage, the efficiencyand the service life are improved compared with those of an existing OLED material.

Embodiments of the invention relate to an X-ray CT system. An X-ray tube and an X-ray detector are arranged opposing one another. X-rays are irradiated from the X-ray tube by revolving around the subject. An X-ray image is obtained based on the X-rays that penetrate the subject and are detected by the X-ray detector. The high voltage generator has an inverter that supplies a voltage to the X-ray tube by switching to a predetermined operating frequency during revolution of the X-ray tube. Regarding the frequency adjustable part, the operating frequency of the inverter is adjustable such that it is a multiple of the collection rate, which is the number of X-ray images obtained per one revolution of the X-ray tube. The timing generator may adjust the voltage supplied to the X-ray tube at a timing synchronized with the operating frequency of the inverter.

The power supply unit is provided with a power supply circuit adapted to generate an output voltage in accord with an instruction voltage, an output condenser Co connected to the output end of the power supply circuit, and an auxiliary output voltage setting circuit adapted to compare the instruction voltage and the output voltage and to cause the output condenser to discharge its electric charge when the instruction voltage becomes lower than the output voltage. Because of the auxiliary output voltage setting circuit, the power supply circuit quickly generates an output voltage in accord with the instruction voltage if the instruction voltage is lowered.

A first substrate, a second substrate opposing to the first substrate, and liquid crystal provided in a space between the first substrate and second substrate are provided to an IPS mode liquid crystal display. A plurality of gate lines and a plurality of drain lines, thin film transistors, pixel electrodes, and common electrodes are formed on a transparent substrate in a first substrate. Each of the thin film transistors is provided in a vicinity of the intersection of the gate line and drain line. Each of the pixel electrodes is formed within a pixel region enclosed with an adjacent pair of the gate lines and an adjacent pair of the drain lines. Each of the common electrodes develops an electric field within each of the pixel regions between the pixel electrode and itself. The second substrate includes color layers provided for each of the pixel regions. The color layers are spaced apart from the gate lines and drain lines when seen on a plane.

The invention relates to a method and a device for operating a drive train (101) of a hybrid vehicle comprising an electrical system (102), the drive train (101) having at least one vehicle drive wheel (105) in addition to one first electrical machine (104) and the first electrical machine (104) being connected to the electrical system (102). According to the invention, in order to stabilise the voltage of the electrical system (102), the first electrical machine (104) is operated without being coupled to the drive wheels (105) of the hybrid vehicle.

A pressure sensor device includes a substrate having a first section and a second section being adjacent to the first section and thinner than the first section, a piezoelectric film having flexibility and disposed on the second section, an upper electrode formed on the piezoelectric film and including a center electrode disposed at a substantially center of the second section in plan view, and a peripheral electrode disposed apart from the center electrode so as to surround the center electrode, a lower electrode formed between the second section and the piezoelectric film and disposed so as to face the upper electrode, and a detection circuit including a differential circuit electrically connected to the center electrode and the peripheral electrode, and the detection circuit detects a difference between a voltage caused between the center electrode and the lower electrode in response to the piezoelectric film being distorted, and a voltage caused between the peripheral electrode and the lower electrode in response to the piezoelectric film being distorted.