摘要:
In accordance with an embodiment, a light emitting element driving circuit includes a comparator having an input connected to smoothing circuit and an output connected to a voltage-dividing circuit through a transistor. A drain-to-source resistance of the transistor is connected in parallel with a portion of the voltage dividing circuit. An output signal of the voltage dividing circuit is connected to another comparator that generates a drive transistor drive signal. The drive transistor is connected to one or more light emitting elements. In accordance with another embodiment, a reference voltage is generated in response to a rectified signal and compared with a sense voltage to generate a drive signal that is used to drive the drive transistor. Light is emitted from the one or more light emitting elements in response to the drive signal and the rectified voltage being greater than the forward voltage drops of the one or more light emitting elements.
摘要:
A TRIAC dimmer gates an AC waveform from an AC power source in proportion to a control signal and outputs a TRIAC pulse having part of the waveform missing. The TRIAC pulse is rectified and is applied to an LED array and the drive current flowing to the LED array is detected at a current detection resistor. The drive current value and a predetermined value are compared at a comparator and in accordance with the comparison result thereof the control transistor is turned off. Then, the TRIAC pulse is converted to a DC voltage signal and in accordance with the obtained DC voltage signal the drive current value or the predetermined value input by the comparator are changed. Furthermore, instead of the TRIAC pulse, a PWM pulse supplied from an external source may also be utilized.
摘要:
A light emitting element driving circuit comprising: a rectifying circuit; a voltage-dividing circuit; a transistor increasing or reducing a driving current of a light emitting element according to turning on or off a rectified voltage; a control circuit bringing the transistor to an on or off state at predetermined intervals and bringing the transistor to the other state when a voltage according to a current flowing through the transistor increases and becomes the reference voltage being divided voltage obtained by dividing the rectified voltage; and a voltage-dividing ratio adjustment circuit to set a voltage-dividing ratio of the voltage dividing circuit as a first voltage-dividing ratio to reduce the reference voltage when an amplitude of the rectified voltage is larger than predetermined amplitude and to set the voltage-dividing ratio as a second voltage-dividing ratio to increase the reference voltage when an amplitude of the rectified voltage is smaller than predetermined amplitude.
摘要:
A TRIAC dimmer gates an AC waveform from an AC power source in proportion to a control signal and outputs a TRIAC pulse having part of the waveform missing. The TRIAC pulse is rectified and is applied to an LED array and the drive current flowing to the LED array is detected at a current detection resistor. The drive current value and a predetermined value are compared at a comparator and in accordance with the comparison result thereof the control transistor is turned off. Then, the TRIAC pulse is converted to a DC voltage signal and in accordance with the obtained DC voltage signal the drive current value or the predetermined value input by the comparator are changed. Furthermore, instead of the TRIAC pulse, a PWM pulse supplied from an external source may also be utilized.
摘要:
A video image processing apparatus including, a generation unit configured to generate a video image frame from an image area to be used included in a video image captured by a camera, a spatial area in the video image being defined by the image area to be used, an encoding unit configured to encode the video image frame into any one of a first video image frame and a second video image frame, and a detection unit configured to detect a trigger for changing the image area to be used to report the detection of the trigger to the generation unit, wherein the encoding unit reports a encoded video image frame type to the generation unit in advance, and in response to receiving the detection of the trigger, the generation unit changes the image area to be used in a video image frame based on the reported type.
摘要:
A battery pack includes a secondary battery, a discharge-control transistor, a charge-control transistor connected in series with the discharge-control transistor between a negative power source terminal of the secondary battery and a terminal of a load or a negative power source terminal of a charger, and a battery protection semiconductor device including a detection circuit that detects at least one of excessively charged, excessive discharging, overcurrent, short-circuit, and overheating states of the secondary battery, a control circuit that turns on and off the discharge-control transistor and the charge-control transistor, and a charge prevention circuit that prevents the secondary battery from being charged by turning off the charge-control transistor when a voltage of the secondary battery is not greater than a predetermined low-voltage criterial voltage variable by trimming a portion of the charge prevention circuit. The charge prevention circuit includes first and second inverter circuits.
摘要:
A battery pack includes a secondary battery, a discharge-control transistor, a charge-control transistor connected in series with the discharge-control transistor between a negative power source terminal of the secondary battery and a terminal of a load or a negative power source terminal of a charger, and a battery protection semiconductor device including a detection circuit that detects at least one of excessively charged, excessive discharging, overcurrent, short-circuit, and overheating states of the secondary battery, a control circuit that turns on and off the discharge-control transistor and the charge-control transistor, and a charge prevention circuit that prevents the secondary battery from being charged by turning off the charge-control transistor when a voltage of the secondary battery is not greater than a predetermined low-voltage criterial voltage variable by trimming a portion of the charge prevention circuit. The charge prevention circuit includes first and second inverter circuits.
摘要:
The invention relates to a photo-curable resin composition, which contains a polyimide silicone having a primary alcoholic hydroxyl group, as a component (A); at least one compound selected from the group consisting of an amino condensation product modified with formalin or a formalin-alcohol and a phenol compound having two or more in average of methylol group or alkoxymethylol group in one molecule thereof, as a component (B); and a photo-acid generator as a component (C). When used as an adhesive, the photo-curable resin composition further contains a multifunctional epoxy compound as a component (D).
摘要:
A silicone resin composition for die bonding is provided. The composition includes (A) a straight-chain organopolysiloxane having silicon-bonded alkenyl groups, and with a viscosity of no more than 1,000 mPa·s, (B) a three dimensional network-type organopolysiloxane resin that is either wax-like or solid at 23° C., (C) an organohydrogenpolysiloxane having SiH groups, and (D) a platinum-group metal-based catalyst. The composition produces a cured product with a high hardness, and good heat resistance, transparency, and light transmittance in the low wavelength region.
摘要:
A polyimide resin, characterized in that the polyimide resin comprises three kinds of repeating units represented by the formula (1), and has a weight average molecular weight, reduced to polystyrene, of from 5,000 to 500,000, an acryl equivalent of from 400 to 3,000 g/eq, and a carboxylic acid equivalent of from 300 to 2500 g/eq wherein X is a tetravalent organic group, Y is a divalent organic group, Z is a divalent organic group, W is a divalent organic group having a polyorganosiloxane structure. The polyimide resin is suitable for preparing a patterned or non-patterned protective coating.
摘要翻译:一种聚酰亚胺树脂,其特征在于,所述聚酰亚胺树脂包括由式(1)表示的三种重复单元,其重均分子量减少至聚苯乙烯为5,000至500,000,丙烯当量为400至3,000 g / eq,羧酸当量为300〜2500g / eq,其中X为四价有机基团,Y为二价有机基团,Z为二价有机基团,W为具有聚有机硅氧烷结构的二价有机基团。 聚酰亚胺树脂适用于制备图案化或未图案化的保护涂层。