摘要:
The invention provides an apparatus and a method for driving a cathode discharge tube such that the discharge starting voltage can be lowered by simple construction. At the start of lighting a cathode discharge tube light, AC voltage applied to the cathode discharge tube is raised at a speed slower than a rise speed of the cathode discharge tube. By lighting the cathode discharge tube in this way, the lighting start voltage can be reduced.
摘要:
The invention provides a method of driving a piezoelectric transformer and a power source apparatus using the same. For a circuit for driving a piezoelectric transformer which steps up a voltage input from a primary electrode by a piezoelectric effect to output the stepped up voltage from a secondary electrode, the gradient (linear differential value) of a step-up ratio at the piezoelectric transformer is detected, and the detected gradient is used to control the driving frequency for the piezoelectric transformer so that the driving frequency approaches to the resonant frequency of the piezoelectric transformer.
摘要:
A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.
摘要:
A compact and high-power piezoelectric transformer is realized by using higher order longitudinal extensional mode vibrations and increasing an effective electromechanical coupling factor by a primary electrode which consists of plural electrodes.
摘要:
A driving method and a driving circuit for a piezoelectric transformer are capable of driving the piezoelectric transformer with high driving efficiency independently of an impedance change of a load such as a cold cathode tube by corresponding to the characteristic variance of the piezoelectric transformer, thereby also suppressing mechanical damage to be imposed on the piezoelectric transformer itself even if the load changes abruptly. The piezoelectric transformer is driven with a predetermined first frequency, and a power supply for a load connected to the secondary side of the piezoelectric transformer is started, and when an impedance of a load changes and reaches a predetermined impedance during the power supply, the driving frequency of the piezoelectric transformer is changed without a sweep from the first frequency to a predetermined second frequency. Furthermore, the second frequency is determined by detecting characteristics of the piezoelectric transformer before supplying the load steadily with electric power.
摘要:
The present invention relates to a drive device for one or more series-connected cold cathode fluorescent lamps having an electrical terminal at each end. The drive device has a piezoelectric transformer for converting by means of the piezoelectric effect a primary ac input applied to primary electrodes to a secondary ac output, which is removed from secondary electrodes; a drive arrangement for applying the primary ac input to the primary electrodes; and a brightness control circuit for controlling brightness. The drive device is configured so that the end electrical terminals of the cold cathode fluorescent lamp can be connected between the two secondary electrodes. The brightness control circuit detects the phase difference between the secondary ac output and the primary ac input. When the detected phase difference is greater than a specified phase difference, the drive arrangement reduces the power of the primary ac input applied to the primary electrodes. If the detected phase difference is less than the specified phase difference, the drive arrangement increases the power of the primary ac input applied to the primary electrodes.
摘要:
A battery pack includes a secondary battery, a secondary battery protecting integrated circuit configured to protect the secondary battery, at least one sensor configured to output a fault signal indicating sensing of a fault in the battery pack or an electronic apparatus including the battery pack, a detecting circuit configured to output a fault detection signal indicating a detection of the fault signal, a delay circuit configured to output a pulse delaying from the fault detection signal, and a counter configured to count a number of generating the pulse, the counter having at least N bits (N is an integer greater than 1), wherein the counter stops an operation until a count of 2(N-1).
摘要:
Disclosed is an information processing apparatus including: a control section to obtain output condition information to show an output condition when a color chart is output, to obtain colorimetric data obtained by measuring the color chart, to create a color conversion profile based on the obtained colorimetric data, and to embed the output condition information in the created color conversion profile according to an order determined in advance.
摘要:
Disclosed are a device, a method, and a storage medium to create a color conversion table. According to one implementation, a color conversion table creating device includes, a color material amount limiting processing section; a first color conversion processing section; a second color conversion processing section; a combining section; a color material amount limiting inverse conversion processing section; and an output value determining section. The color material amount limiting processing section performs color material amount limiting of an input value in the color conversion table. The color material limiting inverse conversion processing section performs inverse conversion of the color material amount limiting after color conversion and combining the CMYK components. The output value determining section sets the inverted CMYK color components as an output value in the color conversion table.
摘要:
According to one embodiment, an information recording and reproducing device includes a stacked body. The stacked body includes a first layer, a second layer and a recording layer provided between the first layer and the second layer. The recording layer includes a phase-change material and a crystal nucleus. The phase-change material is capable of reversely changing between a crystal state and an amorphous state by a current supplied via the first layer and the second layer. The crystal nucleus is provided in contact with the phase-change material and includes a crystal nucleus material having a crystal structure identical to a crystal structure of the crystal state of the phase-change material, and a crystal nucleus coating provided on a surface of the crystal nucleus material and having a composition different from a composition of the crystal nucleus material.