摘要:
A driving circuit is provided, which is configured to supply a driving voltage and a driving current to an LED string. A first detection resistor is arranged on a path of the LED string. A voltage source outputs a control voltage having a level that corresponds to the target luminance level of the LED string, and a first threshold voltage that is proportional to the control voltage. A controller generates a gate pulse signal having a duty ratio that is adjusted such that the voltage drop across the first detection resistor matches the control voltage. A first driver drives a switching transistor of a DC/DC converter according to the gate pulse signal. When the voltage drop across the first detection resistor exceeds the first threshold voltage, a first comparator stops the switching operation of the switching transistor.
摘要:
Fluid drainage slopes are formed at a lower frame part constituting a housing that is provided below circuit board housed inside housing. Drainage ports are also formed at a lowermost part of fluid drainage slope in lower frame part. Thus, fluid that forms in the housing flows down from circuit board and onto fluid drainage slopes to be guided downward from fluid drainage slope to reach drainage ports and be discharged to outside housing. It is thus possible to prevent or suppress the occurrence of short circuits in a circuit board caused by fluid generated and/or accumulated inside the housing.
摘要:
A circuit constituent 10 comprises a circuit board 11 on which a switching member 13 is implemented and a bus bar 12 wired along the circuit board 11, and a case 20 is provided with a frame 21 arranged on the circuit board 11 and fixed along its peripheral edge and a cover 24 assembled to the frame 21 so as to cover the circuit board 11. A plurality of first terminal portions 14 constructed by bending the ends of the bus bar 12 substantially in the L shape are arranged side by side along the frame 21, and a falling restriction portion 36 provided at a front edge portion 24F of the cover 24 restricts falling deformation of the first terminal portion 14. By locking displacement restricting portions 30, 37 provided at the outer edge portions of the frame 21 and the cover 24 with each other, displacement of the cover 24 in the direction separated from the first terminal portion 14 with respect to the frame 21 is restricted, and falling deformation of the first terminal portion 14 can be surely prevented.
摘要:
A power supply circuit includes a standard voltage generator, a regulator, a capacitor and a discharging circuit. The standard voltage generator is configured to generate a standard voltage. The regulator is configured to control an output voltage by use of a reference voltage based on the standard voltage outputted from the standard voltage generator, and to be capable of being switched ON/OFF. The capacitor is connected in parallel to the regulator between the standard voltage generator and the regulator. The discharging circuit is configured to discharge electrical charges from the capacitor while the regulator is in an OFF state.
摘要:
A start-up circuit receives a start-up signal instructing start-up of an equipment mounted with the circuit, and executes a predetermined sequence when start-up is instructed by the start-up signal. An oscillator generates a clock signal. A sequence circuit receives the start-up signal and a clock signal output from the oscillator, measures time by counting the clock signal when the start-up signal transits to a predetermined level, and executes a predetermined event at a predetermined timing. The oscillator operates for a period where the start-up signal is at the predetermined level if the start-up signal is at the predetermined level during the period the power key of the equipment mounted with the circuit is being pushed.
摘要:
A laser recording apparatus for printing multi-tone image data by driving a laser diode according to levels of an analog signal containing the image data thereby to modulate a laser beam output by the laser diode, and causing the modulated laser beam to scan a recording medium in transverse directions. The output of the laser diode is stopped or reduced in level for a certain time in each of periods at predetermined intervals, each period corresponding to each pixel in the printed image. This eliminates mode hopping noise and optical feedback induced intensity noise, and hardly gives rise to the problem of electromagnetic wave disturbance. By elongating or shortening the time for stopping or reducing the emission by the laser diode (which time is shorter than the period corresponding to one pixel), the image density may be adjusted without impairing the above advantage.
摘要:
An aromatic imide polymer laminate material comprising at least one aromatic imide polymer film consisting essentially of at least one aromatic imide polymer which comprises at least 80 molar % of at least one type of recurring unit of the formula (I): ##STR1## wherein R represents a divalent aromatic radical; and at least one metallic foil which is superimposed on and directly bonded to said aromatic imide polymer film, which laminate material is produced by heat-pressing said aromatic imide polymer film superimposed on said metallic foil at 250.degree. to 600.degree. C. under a pressure of 1 to 2,000 kg/cm.sup.2 without applying a bonding agent between the polymer film and the metallic foil.
摘要翻译:芳族酰亚胺聚合物层压材料,其包含至少一种芳族酰亚胺聚合物膜,其基本上由至少一种芳族酰亚胺聚合物组成,所述芳族酰亚胺聚合物包含至少80摩尔%的至少一种式(I)的重复单元: )其中R表示二价芳族基团; 和至少一个叠加在所述芳香族酰亚胺聚合物膜上并直接结合到所述芳族酰亚胺聚合物膜上的金属箔,所述层压材料通过在250℃至600℃下在压力下热压所述金属箔上的所述芳族酰亚胺聚合物膜而制备 为1〜2000kg / cm 2,而不在聚合物膜和金属箔之间施加粘合剂。
摘要:
A detection resistor is arranged on a path of an LED string. A controller generates a gate pulse signal having a duty ratio adjusted such that the voltage drop at the detection resistor matches a predetermined reference voltage. Furthermore, the controller receives a dimming control signal which indicates the duty ratio of the burst dimming operation, and generates a corresponding burst dimming pulse. According to the gate pulse signal, the first driver drives an output circuit configured to generate a driving voltage. A second driver switches a path of a driving current between connection and disconnection according to the burst dimming pulse. A duty ratio detection unit controls the frequency of the gate pulse signal according to the duty ratio indicated by the dimming control signal.
摘要:
An electrical connection box according to the present invention includes a case including a circuit board, a bus bar which is electrically connected to the circuit board and extends outside the case, wherein the bus bar includes a horizontal portion positioned in an area outside the case and extends in a horizontal direction, a lower side holding member of the case positioned near the horizontal portion of said bus bar, and holds said horizontal portion from below or above when a force is applied to the bus bar in a direction in which the horizontal portion lowers or rises, and a recessed portion.
摘要:
A circuit structure 10 includes a circuit board 11 for mounting switching devices 13 and bus bars 12 wired into the circuit along the circuit board 11, and the case 20 includes a frame 21 that is disposed and secured in position around a perimeter edge of the circuit board 11 and a cover 24 that is assembled to the frame 21 so as to cover the circuit board 11. The frame 21 contains a second connector housing, and the second connector housing includes an hood 26a for accommodating the second terminals 15 formed at the ends of the bus bars 12. A deformation restricting portion 32 formed on the cover 24 is configured to abut the upper wall portion 26c (the outer face) of the hood 26a, thereby deformation of the hood 26a is restricted.