摘要:
A pulse modulator generates a first pulse signal having a duty ratio which is adjusted such that a detection voltage which indicates the electrical state of an LED string to be driven matches a predetermined reference voltage. A first pulse signal is applied to a primary coil of a pulse transformer. A DC/DC converter includes a switching element the ON/OFF operation of which is controlled according to a signal that originates at a secondary coil of the pulse transformer. The DC/DC converter stabilizes an input voltage Vdc, and supplies the input voltage Vdc thus stabilized to the anode of the LED string.
摘要翻译:脉冲调制器产生具有调整后的占空比的第一脉冲信号,使得指示要驱动的LED串的电状态的检测电压与预定参考电压匹配。 第一脉冲信号被施加到脉冲变压器的初级线圈。 DC / DC转换器包括根据源自脉冲变压器的次级线圈的信号控制其ON / OFF操作的开关元件。 DC / DC转换器稳定输入电压Vdc,并且将如此稳定的输入电压Vdc提供给LED串的阳极。
摘要:
A pulse modulator generates a first pulse signal having a duty ratio which is adjusted such that a detection voltage which indicates the electrical state of an LED string to be driven matches a predetermined reference voltage. A first pulse signal is applied to a primary coil of a pulse transformer. A DC/DC converter includes a switching element the ON/OFF operation of which is controlled according to a signal that originates at a secondary coil of the pulse transformer. The DC/DC converter stabilizes an input voltage Vdc, and supplies the input voltage Vdc thus stabilized to the anode of the LED string.
摘要翻译:脉冲调制器产生具有调整后的占空比的第一脉冲信号,使得指示要驱动的LED串的电状态的检测电压与预定参考电压匹配。 第一脉冲信号被施加到脉冲变压器的初级线圈。 DC / DC转换器包括根据源自脉冲变压器的次级线圈的信号控制其ON / OFF操作的开关元件。 DC / DC转换器稳定输入电压Vdc,并且将如此稳定的输入电压Vdc提供给LED串的阳极。
摘要:
An exhaust gas purification system with which diesel particulate filter (“DPF”) regeneration can be continued even when deceleration occurs during the DPF regeneration. The system includes a regeneration deceleration period intake/exhaust control unit that, when a vehicle decelerates during the DPF regeneration, increases an exhaust gas flow rate through an exhaust pipe by controlling respective openings of an exhaust gas recirculation (“EGR”) device and an intake throttle and adjusting a turbocharging amount of a high pressure stage turbocharger.
摘要:
A hydrogen electrolysis apparatus includes a stack of unit cells each having a membrane electrode assembly sandwiched between an anode separator and a cathode separator. The anode separator has a first flow field which is supplied with water, and the cathode separator has a second flow field which produces high-pressure hydrogen through an electrolysis of the water. The cathode separator also has a first seal groove defined therein which extends around the second flow field and a first seal member inserted in the first seal groove. The first seal groove and the second flow field are held in fluid communication with each other through passageways. The passageways keep the first seal groove and the second flow field in direct fluid communication with each other in bypassing relation to the boundary between the cathode separator and a solid polymer electrolyte membrane.
摘要:
According to one embodiment, an optical head includes a light emitting substrate emitting light and a heat sink including a contact section in contact with an area different from a light emitting area of the light emitting substrate and a deformable section separated from the light emitting substrate and deformed according to thermal expansion of the light emitting substrate.
摘要:
In a liquid ejection apparatus, common liquid chambers adjacent to each other and connection passages extending from the adjacent common liquid chambers are separated by a partition wall. The partition wall has a first side surface and a second side surface opposite the first side surface. The first side surface define one of side surfaces of the common chamber and one of side surfaces of the connection passage extending from the common chamber. The second side surface defines one of side surfaces of the other common chamber and one of side surfaces of the other connection passage extending from the other common chamber. The partition wall has a curved surface connecting the first side surface to the second side surface in a vicinity of a position where the connection passages having the partition wall placed therebetween are connected to each other. A curvature of the curved surface is larger than a curvature of an arc having a diameter equal to a width of the partition wall.
摘要:
An ink-jet head includes a channel unit which includes a plurality of pressure chambers, a vibration plate stacked on the channel unit, and a piezoelectric material layer arranged on the vibration plate. The piezoelectric material layer includes a first portion functioning as a piezoelectric actuator, and a second portion functioning as a piezoelectric transformer which amplifies a driving signal to be supplied to the piezoelectric actuator. Accordingly, it is possible to realize a small-size ink-jet head with a built-in piezoelectric amplifier.
摘要:
An ink-jet head includes a channel unit in which two sets of a manifold and five pressure chambers adjacent to the manifold are formed, a vibration plate which is provided on an upper surface of the channel unit, a piezoelectric layer which is provided on an upper surface of the vibration plate, and a piezoelectric actuator which includes individual electrodes provided on an upper surface of the piezoelectric layer, corresponding to the pressure chambers. The vibration plate is arranged such that the vibration plate covers 10 pressure chambers and two manifolds, and on a lower surface of the vibration plate, in an area overlapping with the two manifolds, a recess having a cross-sectional shape of a taper is formed. Due to the recess, a pressure wave which is propagated to the manifold can be attenuated assuredly.
摘要:
The invention provides a Fresnel lens sheet, in which a rainbow, hot band, moiré, color corn and the like are inconspicuous, bright uniformity is maintained, sharpness of an image is not deteriorated, and a balance is kept, and provides a rear projection type screen having the Fresnel lens sheet. In the Fresnel lens sheet 1 having a Fresnel lens element group 4 each Fresnel lens element composed of a Fresnel lens surface 2 and a non-lens surface 3 on a surface (light outgoing surface 7) thereof, the surface roughness of at least one of the Fresnel lens surface 2 of the Fresnel lens element group, the non-lens surface 3 of the Fresnel lens element groups 4, and the sheet surface 12, on which no Fresnel lens element group 4 is formed, is made rougher from the central portion of the Fresnel lens sheet outwardly. At the time, it is preferable that the difference between the surface roughness of the central portion of the Fresnel lens sheet 1 and the surface roughness of the outer peripheral portion of the Fresnel lens sheet be 0.1 μm or more to 5.0 μm or less.
摘要:
A battery is charged by using in series a constant-voltage DC power supply with current limit function and a constant voltage circuit which has a differential comparator circuit and whose current limit value is variable. Following a period of charging with the current of current limit value by the constant-voltage DC power supply, a period is provided in correspondence with the state of charging of the battery, for charging with a current limit value of the constant voltage circuit which is smaller than that current limit value. The detection of the charging state of the battery is effected by a comparison between a current value of a current source of a differential comparator circuit and a differential output of that differential comparator circuit. It enables to reduce electric power consumed by the control transistor of the constant voltage circuit and to reduce the allowable loss required for the control transistor.