Abstract: A piezoelectric crystal tuning fork resonator comprises a tuning fork base and a plurality of tuning fork tines connected to the tuning fork base, each of the tuning fork tines having opposite main surfaces and side surfaces, a groove having a plurality of stepped portions being formed in at least one of the opposite main surfaces of each of the tuning fork tines, a plurality of first electrodes being disposed on the stepped portions of the groove in at least one of the opposite main surfaces of each of the tuning fork tines, a plurality of second electrodes being disposed on the side surfaces of each of the tuning fork tines, the piezoelectric crystal tuning fork resonator comprising three electrode terminals and each of the three electrode terminals having a different electrical polarity.

Abstract: The present invention provides an optical filter for a display device capable to improve the bright-location contrast, and a display device in particular a plasma display device incorporating the optical filter. In a transmittance spectrum of the optical filter, a transmittance in a region having a wavelength range of 430 nm to 445 nm, a transmittance in a region having a wavelength range of 535 to 560 nm, and a transmittance in a region having a wavelength range of 605 to 630 nm are set to 80% or less of the maximum transmittance over the entire visible wavelength region.

Abstract: A spark plug including: a external terminal; a center electrode; an insulator having a through hole as defined herein and containing alumina ceramics; and a conductive seal. The conductive seal contains base glass, a conductive filler and from 0 to 10 weight % of an insulating filler, and the base glass contains Si, B, Ca, Al, Na and K components in amounts defined herein. Also disclosed is a spark plug including a center electrode; an external terminal; a first conductive seal; a second conductive seal; a resistor provided as defined herein; and an insulator having a through hole as defined herein. The center electrode and the external terminal are bonded to the first conductive seal and the second conductive seal, respectively, in the through hole. The first and second conductive seals each contains base glass, a conductive filler and amounts of an insulating filler as defined herein.

Abstract: A field emission device having cold cathode devices including an emitter and a lead electrode, and the field emission device is provided with the plural kinds of cold cathode device groups classified based on the emission property of the cold cathode device. This field emission device has a member for allowing the cold cathode device group to perform emission by successively changing the cold cathode device group that mainly performs emission based on the difference in the emission property. Thus, it is possible to maintain the emission current at a predetermined necessary value or more and to realize the long lifetime of the field emission device.

Abstract: A field emission display includes first and second substrates provided opposing one another with a predetermined gap therebetween; electron emission sources provided on one of the first and second substrates; an electron emission inducing assembly for inducing the emission of electrons from the electron emission sources; and an illuminating assembly provided on the substrate on which the electron emission sources are not formed, the illuminating assembly realizing images by the emission of electrons from the electron emission sources. The electron emission sources include a carbon nanotube layer and a base layer, the base layer connecting the carbon nanotube layer to the substrate and applying a voltage to the carbon nanotube layer required for the emission of electrons. Also, the carbon nanotube layer is provided on the base layer in a state substantially un-mixed with the base layer.

Abstract: A field emission display including a first substrate and a second substrate opposing one another with a predetermined gap therebetween. An electron emission assembly is formed on the first substrate that emits electrons by the formation of an electric field. An illumination assembly is formed on the second substrate that realizes the display of images by the emitted electrons. A grid plate is mounted between the first and second substrates and functions to focus the emitted electrons. The grid plate includes a mask section having a plurality of apertures for passing the electrons, and supports mounted to one side of the mask section and extending in a direction toward the first substrate to rest on the same and support the mask section. The mask section and the supports are made of same material or two different materials.

Abstract: A patterned substrate includes a base layer; a droplet holding space surrounded by a barrier that is formed over the base layer; and a pattern formed by discharging droplets containing a pattern formation material into the droplet holding space surrounded by the barrier. A recess that is lyophilic with respect to the droplets and that expands outward in a planar direction of the base layer is provided on a base layer side of the barrier.

Abstract: A white LED (20) for emitting illumination light entirely to exterior, comprising a first LED element (4) and a second LED element (5) which have mutually different emission wavelengths, and a sealing member (10) including a fluorescent material (8) which is excited to emit yellow light (sy) and for sealing at least the first LED element, the first LED element (4) being a long wave length-blue LED element for emitting blue light (sb 1) of a long wave length in which a peak wave length is in the range of 470 nm to 490 nm, the second LED element being a red LED element for emitting red light (sr).

Abstract: A high contrast organic light-emitting device (OLED) includes a composite electron transport layer including a generally transparent electron transport layer and a light-absorbent electron transport layer formed of buckminsterfullerene. The light-absorbent electron transport layer absorbs environmental light and the OLED provides an undistorted display with high contrast. The light-absorbent electron transport layer may be disposed directly between the generally transparent electron transport layer which may be formed of Alq, and an LiF electron injection layer of a metallic cathode.

Abstract: The organic electroluminescence display apparatus of the present invention comprises a first and second substrates, the former being coated with banks for separating pixels, a lower electrode, organic light-emitting layer and upper electrode of a transparent material in this order, and the latter being coated with a color filter and electroconductive shadow pattern, wherein the organic light-emitting layer surrounded by the banks for separating pixels faces the color filter, and the first and second substrates face each other in such a way that the upper electrode over the banks for separating pixels is electrically connected to the electroconductive shadow pattern. This structure connects at least one of the upper electrode and electroconductive shadow pattern to a power supply point, to control ununiform emitted light brightness which may result from voltage drop at the upper transparent electrode.

Abstract: An organic electroluminescent display comprises: anode electrodes of R, G and B unit pixels formed separate from each other on a substrate; organic thin-film layers of the R, G and B unit pixels formed on the anode electrodes; and a cathode electrode formed over an entire surface of the substrate. The anode electrode of at least one unit pixel, among the R, G and B unit pixels, has a thickness different from anode electrodes of the other unit pixels. The anode electrode of each of the unit pixels comprises a first film having a high reflectivity and a second film for adjusting a work function. The second film of at least one unit pixel, among the unit pixels, has a thickness different from the second films of the other unit pixels. The second film of the R unit pixel is thicker than the second films of the other unit pixels.

Abstract: A plasma display device enhances a shield structure for shielding electromagnetic interference (EMI) and/or noise arising in a circuit board. The plasma display device includes a plasma display panel (PDP) for displaying a predetermined image thereon. In addition, the plasma display device includes a chassis base for supporting the PDP, a circuit board installed on the chassis base, and a shield member for covering at least a portion of the circuit boards. The shield member has a conducting layer on at least one side of an insulating substrate. Using the structure described, EMI and/or noise arising from the circuit board is shielded.

Abstract: A plasma display panel includes a back substrate having back barrier ribs partitioning a plurality of discharge cells; a front substrate arranged to be opposite to the back substrate and having front barrier ribs partitioning the discharge cells in cooperation with the back barrier ribs; back discharge electrodes arranged within the back barrier ribs to enclose the discharge cells; front discharge electrodes arranged within the front barrier ribs to enclose the discharge cells; phosphor layers arranged within the discharge cells; and discharge gas arranged within the discharge cells.

Abstract: Plasma display panels (PDPs) that can be readily manufactured and that have increased bright room contrast ratios are provided. One PDP includes a front substrate adapted to allow visible light to pass, a rear substrate facing the front substrate, and a plurality of barrier ribs disposed between the front substrate and the rear substrate defining a plurality of discharge cells. At least a portion of the barrier ribs is colored with a first color. The PDP further comprises a plurality of sustain electrodes disposed on the front substrate facing the rear substrate, each of which has a plurality of electrode parts. The PDP also includes a front dielectric layer disposed on the front substrate covering the sustain electrodes. The front dielectric layer is colored with a second color. Brightness and chroma of both of the first and second colors are reduced when the first and second colors are subtractively mixed.

Abstract: A device is proposed for producing high-frequency microwaves, having a cathode arrangement with heatable cathodes for emitting electrons, two grating arrangements for controlling and focusing the electrons flow and an anode for recaiving the electrons passing through the grating arrangements. The cathode arrangement and the first grating arrangement and also a blocking or choke element define an output cavity forming a resonance cavity and the anode and the second grating arrangement define an output cavity likeeise forming a resonance cavity. The cathode arrangement has a monuting for the cathode such that deformation of the cathode with reduction of the spacing between the heatable cathode and grating is avoided.

Abstract: A display device in which a light shielding film is formed so as not to increase the number of steps and its cost, is provided. The display device of the present invention includes a monitor element for controlling influence on a light-emitting element due to temperature change and change with time and a TFT for driving the monitor element, and the TFT for driving the monitor element is provided so as not to be overlapped with the monitor element. The display device of the present invention includes a first light shielding film provided so as not to be overlapped with a first electrode of the monitor element, and a second light shielding film provided so as to be overlapped with an outer edge portion of the first electrode.

Abstract: The present invention discloses an organic light emitting diode capable of obtaining proper luminance and long life cycle by controlling an amount of current flowing through an organic electroluminescent device per unit pixel. The organic light emitting diode includes a luminescent device and first and second transistors for driving the luminescent device, wherein the first and second transistors have different resistance values. The first transistor is a driving transistor for driving the luminescent device. The second transistor is a switching transistor for switching on and off the driving transistor. The driving transistor may have a higher resistance value than the switching transistor.

Abstract: An organic light-emitting panel includes a data line, a scan line, a voltage applying line, a switching device, an organic light emitting device and a driving device. The voltage applying line satisfies a condition expressed as V ? ( max ) n < A ? ? ? ? VData ? GS n ? [ Volt ] , wherein ?Vmax is a maximum voltage drop, ‘n’ is a number of pixels that are electrically connected to the voltage applying line, ‘A’ is a correction coefficient that is in a range from about 1 to about 4, ?Vdata is a voltage difference between the gray scales, and GS is a number of gray scale. According to the organic light-emitting panel, the voltage drop of the voltage applying line is reduced.

Abstract: To avoid the phenomenon of unsightly flickering in images projected by the projector, in high pressure discharge lamps—especially in high intensity discharge lamps, such as high pressure mercury lamps, metal halide lamps, and xenon lamps—that are used in projectors, even in the presence of the phenomenon of cyclical modulation of the lamp voltage by the returning the light spectrum when the light reflected by the dynamic color filter returns back through the optical system to the lamp, at least during steady operation of the discharge lamp (Ld), a target lamp current signal generation circuit (Up) acquires multiple lamp voltage detection signal (Sv) over a period that is at least as long as the color order cycle of the dynamic color filter (Of) and generates a target lamp current signal (St) based on the multiple lamp voltage detection signals (Sv) that were acquired.

Abstract: Electrodeless discharge lamp lighting device. Start circuit 19 sweeps operating frequency of resonance circuit 16 from start frequency to end frequency of resonance frequency side through drive circuit 18 and DC/AC conversion circuit 15, and starts electrodeless discharge lamp 13. Control circuit 10 increases or decreases variable power into circuit 18 so that detection current comes to equal prescribed current for shifting the operating frequency to middle range frequency between the start frequency and the end frequency. The prescribed current is set so that the detection voltage in case of the middle range frequency becomes lower than that in case of the end frequency. Capacitor 106 constituting integration circuit starts suppression of operation of circuit 10 when lamp 13 is started, and holds the suppression during at least start mode. Accordingly, it is possible to stably start lamp 13 and control stress on circuit(s) after lamp 13 is successfully started.

Abstract: A buck converter generates a direct current (DC) bus voltage at a buck converter output. An inverter circuit is coupled to the buck converter and configured to receive the generated DC voltage and convert the DC voltage into an alternating current (AC) voltage to drive a lamp. A power control circuit is coupled to the buck converter output and configured to provide a control voltage signal to the buck converter so that the buck converter generates the DC voltage and current of a predetermined value. A crest factor reduction circuit is coupled (a) to the buck converter output to sense a rate of change in the generated DC bus voltage, and (b) to the power control circuit to modify the control voltage signal based on the sensed rate of change in the DC bus voltage.

Abstract: A driving device is provided, which includes: a switching unit directly connected to a first voltage from a source external to the driving device; a transforming unit indirectly connected to the switching unit for transforming the first voltage into a second voltage and applying the second voltage to a light source; a signal transmitting unit indirectly connected to the switching unit and transmitting a driving voltage for driving the switching unit based on a control signal; and an inverter controller outputting the control signal to the signal transmitting unit.

Abstract: An inverter transformer includes a coil unit including a bobbin and a plurality of windings, and a transformer core unit. The bobbin is formed with a core-receiving compartment, and includes first, second and third coil winding portions. The windings are wound around the first, second and third coil winding portions, respectively. The transformer core unit has an internal core part that extends into the core-receiving compartment.

Abstract: A device for driving a light source (L11) including a first lamp (a1) and a second lamp (a2) includes two power supply circuits, two transformers (12, 12?), and two current balancing components (13, 13?). Each power supply circuit includes a direct current (DC) power source (10 or 10?) and a DC to alternating current (AC) converter (11 or 11?). The DC/AC converters convert DC signals received from the corresponding DC power sources to AC signals. The transformers correspondingly convert the AC signals to other AC signals. The current balancing components are respectively connected between the transformers and the lamps. The feedback circuits correspondingly feed back current flowing through the lamps to the DC/AC converters.

Abstract: A system and method for compensating the output of an uncompensated Hall Effect sensor used to monitor an output shaft of an actuator. The actuator includes an output shaft, a magnet coupled to the output shaft, a motor for rotating the output shaft between a first position and a second position and an electronic control module having a controller, a diode and an uncompensated Hall Effect sensor.

Abstract: A motor is provided that includes multiple sets of independent stator windings that are not magnetically coupled, which allows the motor to be driven by multiple independent current drivers, and thereby increases the overall torque generated by the motor. In one embodiment, the motor is a brushless DC motor that includes a rotor and a stator. The rotor is configured for rotation, and the stator surrounds at least a portion of the rotor and has multiple sets of independent stator windings wound thereon. Each set of independent stator windings is configured to be independently energized and, when energized, magnetically independent of the other sets of independent stator windings.

Abstract: An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational motion of the motor, based on the rotational state signal generated by the signal generator, to thereby control the motor based on the produced control signal. The controller produces the control signal during a start up of the motor, such that the produced control signal is not affected by a noise component which is incorporated into the rotational state signal during the start up of the motor.

Abstract: A motor driving part has half bridge circuits in which a high potential side drive transistor and a low potential side drive transistor are connected in series to each other, and a connection point therebetween serves as a stator winding driving terminal of each phase of a motor. A rotor position detector detects a rotor position of the motor and outputs a rotor position signal. The current phase detector detects the phase of a phase current flowing in the stator winding driving terminal. A voltage signal generator controls and generates a voltage profile signal such that a first phase difference that is a difference between the phase of the phase current and the phase of the rotor position signal is kept to a predetermined electrical angle. A driving signal generator generates a PWM signal that drives the drive transistor of each phase depending on the voltage profile signal.

Abstract: A power control apparatus for a motor is disclosed. The power control apparatus includes: a moisture sensor for detecting moisture soaking into a housing including the motor; and a switching unit which is switched by an output signal of the moisture sensor, and switches on or off an AC power-supply signal applied to a driver circuit for providing the motor with a drive power-supply signal. Therefore, if moisture soaks into the suction apparatus including the motor, the AC power-supply signal applied to the driver circuit is blocked due to the moisture, such that a user can be protected from electric shock.

Abstract: A motor comprises: coil on/off switching devices for switching between an on-state wherein current is supplied to the coils, and a first off-state wherein the coil terminals are open-circuited or a second off-state wherein the coil terminals are short-circuited; and a coil current control device for controlling switching operations of the coil on/off switching devices according to commands input to the motor. In the event that motor movement with great mechanical compliance is required, the ratio of the period of the first off-state is increased, and on the other hand, in the event that motor movement with great viscosity resistance is required, the ratio of the period of the second off-state is increased. This solves the problems of torque loss and cogging during a period wherein no current is applied to the coil.

Abstract: A capsule type micro-robot moving system moves on an organ's wall covered with mucilage at a high speed. The present invention provides a capsule type micro-robot moving system, which is structured such that a head is formed in a semi-spherical shape and the outer surface of the capsule is coated with an anti-adhesion coating agent for reducing friction against organs during the movement, particularly, is structured to move as long as a linear stroke corresponding to the distance between the driving part and the inner cylinder in the state that the limbs folded in and unfolded out of the capsule completely contact and stick to the walls of the organs, resulting in providing the reliability and moving more rapidly.

Abstract: In a method for measuring motor speed and position by detecting the back EMF generated during pole-pair interactions, a separate respective duration of a power phase suppression signal, that is set during back EMF detection, is stored in memory for each respective pole. The separate respective duration values are determined during a calibration phase by iteratively lengthening each respective duration one unit at a time (up to a maximum value) until no part of the respective back EMF signal occurs outside the suppression signal duration, and those values are stored. During operation, the approach of a pole-pair interaction may be determined from the electrical cycle of the power supply, and then the stored duration value is used to control the state of the suppression signal.

Abstract: A system and method for extracting estimated input voltage and input current values of an AC motor based on sensed power inverter output voltage and output current when the AC motor is connected to a front-end EMI filter and the EMI filter is connected to a power inverter. Where the system includes a current estimator portion, and a voltage estimator portion. The estimated input values are used by a feedback controller in the power inverter to control the motor. A second system and method for extracting estimated an input current of an AC motor based on the actual motor input voltage, and the output voltage of the power inverter.

Abstract: A moving-object directing system for directing a moving object to a target location includes: a moving-object directing unit and a moving object. The moving-object directing unit includes: a directing signal transmitter for generating a first moving-object directing signal, sequentially transmitting the first moving-object directing signal 360° in all directions, generating a second moving-object directing signal corresponding to directing information for directing the moving object to the target location upon receiving a signal indicating successful reception of the first moving-object directing signal, and transmitting the second moving-object directing signal, and a first RF (Radio Frequency) communication unit for receiving a signal indicating successful reception of the moving-object directing signal.

Abstract: A guided stage mechanism suitable for supporting a reticle in a photolithography machine includes a stage movable in the X-Y directions on a base. Laterally surrounding the stage is a rectangular window frame guide which is driven in the X-axis direction on two fixed guides by means of motor coils on the window frame guide cooperating with magnetic tracks fixed on the base. The stage is driven inside the window frame guide in the Y-axis direction by motor coils located on the stage cooperating with magnetic tracks located on the window frame guide. Forces from the drive motors of both the window frame guide and the stage are transmitted through the center of gravity of the stage, thereby eliminating unwanted moments of inertia. Additionally, reaction forces caused by the drive motors are isolated from the projection lens and the alignment portions of the photolithography machine.

Abstract: A universal battery charger is described for accommodating a range of batteries. An adapter or connector is provided for each different type of battery which engages the standard housing including the main power supply. The adapter includes electronics which control the charging process, customised for each battery type. The adapter forms the front part of the charger and slides in from the front.

Abstract: To provide a universal battery charger with low power consumption during a standby condition and a rush current suppressing capability at the time of commencement of charging, a voltage slightly larger than a battery voltage is produced and applied to the battery. Thereafter, the highest voltage is produced and applied to the battery to charge the same. When the battery is unloaded from the battery charger, the lowest voltage is produced to save power consumption.

Abstract: A multi-voltage power supply system, such as a 14V/42V dual-voltage system for vehicular applications, includes a battery arrangement and an intelligent switching regulator for providing at least a first output at a first potential and a second output at a second potential higher than the first potential. The battery arrangement includes a plurality of segments each providing an output substantially equal to the first potential. The switching regulator selectively conFIG. s each of the segments as a first part having a potential difference determined with respect to the first potential and a reference potential, e.g., ground, such that the power supply system provides the first and second outputs while minimizing degradation of the segments.

Abstract: A remaining battery capacity indicating apparatus includes an end voltage accumulated value setting unit operable to set an accumulated value indicative of a remaining capacity of a lithium-ion secondary battery, the accumulated value being set in a fully charged state of the battery so that the accumulated value reaches zero when a voltage in the battery is a device-side end voltage. It is determined whether a battery-side end voltage which ends discharges from the lithium-ion secondary battery corresponds to the device-side end voltage. If the battery-side end voltage does not correspond to the device-side end voltage, then the accumulated value is corrected in response to the device-side end voltage. A remaining capacity of the battery, corresponding to the device-side end voltage, is calculated based on the corrected accumulated value, and the calculated remaining capacity of the battery is displayed on a display unit.

Abstract: A power supply for an ion engine comprises a multiphase alternator and a power converter comprising a voltage multiplier coupled to each phase of the alternator. Each voltage multiplier comprises one or more staged voltage doublers. The alternator phases may be coupled to each other in a Y configuration such that no common return line is required, and each phase of the alternator provides equal amounts of constant power in a balanced, sequential flow. The converter corrects for the alternator's inherent internal reactance, thereby minimizing the required output of the alternator and reducing the overall power required of the system. A controllable impedance can be inserted into a low voltage portion of the multiplier for selectably varying the output voltage and power of the supply.

Abstract: An excitation system that includes an exciter for generating a field voltage for a rotor, a first automatic voltage regulator and a second automatic voltage regulator. The first regulator receives an output voltage of the power generation system as an input, and the second regulator receives the field voltage as an input. An output of the first regulator is provided as a second input to the second regulator. The first regulator is in selective electrical communication with the exciter through a first line conductor having first separable contacts such that an output of the first regulator may be selectively provided as an input to the exciter. The second regulator is in selective electrical communication with the exciter through a second line conductor having second separable contacts such that an output of the second regulator may be selectively provided as an input to the exciter.

Abstract: The vehicle-generator output voltage control apparatus includes a voltage control circuit regulating an output voltage of a vehicle generator by controlling a field current flowing into a field winding of the vehicle generator by controlling a conduction state of a switching transistor series-connected to the field winding, a power-generation-state signal output circuit outputting a power-generation-state signal through a transmitting/receiving terminal by changing a voltage at the transmitting/receiving terminal in accordance with conduction state of the switching transistor, and a power generation stop circuit stopping power generating operation of the vehicle generator by causing the voltage control circuit to turn off the switching transistor upon detecting a change of the voltage at the transmitting/receiving terminal caused by a power generation stop signal transmitted from an external control device and received at the transmitting/receiving terminal.

Abstract: A permanent magnet starter/generator subsystem configured in a fault tolerant architecture is described herein for small engine applications. The system allows for lighter system weight, improved system reliability, higher performance capability and reduced maintenance.

Abstract: A multiple output stage converter (MOSC) and an operating method thereof are provided. The MOSC includes a first transistor, a second transistor, a third transistor, and a logic control module. A terminal of the first transistor, a terminal of the second transistor, and a terminal of the third transistor are coupled to a power source via an inductor. Another terminal of the first transistor is coupled to a first output terminal. Another terminal of the second transistor is coupled to a second output terminal. Another terminal of the third transistor is coupled to a ground voltage. The logic control module is used to control the on/off state of the second transistor. The well of the second transistor is floating when the first transistor or the third transistor is on. The well of the second transistor is floated or coupled to the second output terminal when the second transistor is on.

Abstract: A method and a circuit for scrambling the current signature of a load including at least one integrated circuit executing digital processings, including the step of, at least on the load ground side, combining a current absorbed by a first linear regulator with a current absorbed by at least one capacitive switched-mode circuit with one or several switched capacitances.

Abstract: A power supply system includes an adapter to receive power from a power source, and output a regulated output voltage (Vout). A tip receives Vout from the adapter, and output Vout to an electronic device. The tip includes active circuitry to adjust a programming voltage (Vprog). Vprog is fed back to the adapter to control a magnitude of Vout.

Abstract: A four switch voltage converter is regulated for buck mode and boost mode under constant frequency valley-peak current mode control. Protection circuits are responsive to output voltage and regulator current to prevent excessive current that otherwise might result from abnormally low output voltage short circuit, or spurious switching abnormalities during low duty cycle operation. The regulator control circuit is responsive to the protection circuits to automatically connect a regulator inductor between a common potential and the output to limit current.

Abstract: A synchronous buck DC/DC converter to perform an improved switching operation by adjusting a variable resistor is provided. The synchronous buck DC/DC converter includes a switching unit for switching two PWM signals inverted with a dead time and outputting the PWM signals, a smoothing circuit for outputting DC power using a waveform output from the switching unit as an input, a variable resistor connected to the switching unit and adjusting a switching time of the waveform output from the switching unit, and a variable resistor controller for sensing a current from an output terminal of the smoothing circuit and setting the resistance of the variable resistor to a resistance corresponding to the sensed current.

Abstract: A range of a frequency measuring device having limited range is extended by pre-processing an input signal. The input signal is divided into a plurality of channels. In each channel, the input signal is divided into sub-bands. A frequency of the input signal is determined using a frequency measuring device having limited range. The frequencies are stored in a frequency set. The frequency set is used to determine a frequency associated with the input signal according a set of pre-determined reconstruction rules.

Abstract: The present invention is to provide a method and apparatus of voltage measurement with a high resolution. An apparatus of voltage measurement includes: a buffer circuit for separating a voltage between terminals of a capacitor or an equivalent voltage into a first voltage region corresponding to a full scale of an analog/digital (A/D) converter and a second voltage region corresponding to a voltage exceeding the full scale of the A/D converter when the voltage between the terminals of the capacitor charged or the equivalent voltage is higher than the full scale of the A/D converter; the A/D converters corresponding to the first and second voltage regions for converting the voltages of the respective regions from analog to digital values; and a voltage measurement device for evaluating a measured voltage value from the digital values and calculating the voltage of the voltage supply.