摘要:
An LED driving circuit drives a display backlight LED string including multiple LEDs connected in series. A power supply supplies a driving voltage from an output terminal thereof to a first end of the LED string. A detection resistor is arranged between a second end of the LED string and a fixed voltage terminal. The LED driving circuit receives a pulse modulation signal having a duty ratio that corresponds to the luminance. In the on period, in which the PDIM signal is the first level, the LED driving circuit controls the power supply such that the voltage drop across the detection resistor approaches a predetermined target value. In the off period, in which the PDIM signal is the second level, the LED driving circuit stops the control operation for the power supply.
摘要:
A high-side transistor and a low-side transistor each has gate electrodes configured so as to allow signals to be input and output via a driving contact and a detection contact provided at different positions. When a control signal is at a first level and a signal output from the detection contact on the low-side transistor side is at a low level, the high-side driver applies a low-level signal to the driving contact on the high-side transistor side. When the control signal is at a second level and a signal output from the detection contact on the high-side transistor side is at a high level, the low-side driver applies a high-level signal to the driving contact on the low-side transistor side.
摘要:
In a digital camera implementing the present invention, a metal tripod seat is arranged on a cabinet, a circuit part that generates heat is accommodated in the cabinet, the circuit part is connected with the tripod seat in a heat conducting manner, and a cover strip made of resin extending from the cabinet covers the tripod seat. The tripod seat is arranged at one end of the cabinet, and the outer surface of the cabinet has a projection formed at a site facing the circuit part, and forms a heat radiating space allowing flow of heat to the other end of the cabinet with the circuit part.
摘要:
A sensor device includes: one or more sensor elements each including first and second diode elements connected in series and a sensor driving section. The cathode of the second diode element is connected to the anode of the first diode element. The sensor driving section controls on-off state of the first diode element through changing a gate voltage under a fixed cathode voltage, and controls on-off state of the second diode element through changing a gate voltage under a fixed anode voltage. The sensor driving section drives the second diode element, maintaining a relationship of Vg2(off)
摘要:
An under voltage lock out circuit which monitors an input voltage and executes a predetermined sequence when the input voltage satisfies a predetermined condition may include a voltage comparison unit which compares the input voltage and a predetermined threshold voltage, and outputs a comparison signal; a logic circuit which receives the comparison signal output from the voltage comparison unit and a start-up signal instructing start-up of an equipment mounted with the under voltage lock out circuit, and asserts a sequence control signal when start-up is instructed by the start-up signal in a state the input voltage is higher than the threshold voltage; and a sequence circuit which executes a predetermined sequence when the sequence control signal is asserted, wherein the predetermined threshold voltage is switched according to the sequence control signal.
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:
It is an object to provide a fuse module having a power distribution function of distributing a common power to a plurality of power input sections and a function of protecting a circuit from an overcurrent during the power distribution based on fuse elements interposed in the circuit, while allowing for replacement and concentrated management of the fuse elements. A fuse module as specific means for achieving the object is adapted to connect a common power supply to a plurality of power-input sections of a circuit assembly, and provided with an insulation housing 52, a branch-connection conductor 54 and a plurality of power-input conductors which are held in the insulation housing. The branch-connection conductor 54 has an input terminal 55 adapted to be connected to the power supply, and a plurality of fuse-connection terminals 54a disposed correspondingly to the respective power-input sections. Each of the power-input conductors is electrically connected to a corresponding one of the power-input sections, and has a fuse-connection terminal and disposed in a pair with a corresponding one of the fuse-connection terminals 54a. Then, a fuse element is installed in each of a plurality of fuse-installation portions arranged in the insulation housing 52 so as to be connected to the fuse-connection terminal 54a of the branch-connection conductor 54 and the corresponding fuse-connection terminal of the power-input conductor to be interposed between the fuse-connection terminals of the pair.
摘要:
A voltage comparison unit compares a battery voltage with a predetermined threshold voltage, and outputs a comparison signal. A sequence circuit receives the comparison signal and a start-up signal instructing start-up of equipment mounted with a UVLO circuit, and executes a predetermined sequence when start-up is instructed by the start-up signal in a state the battery voltage is higher than the threshold voltage. A voltage control unit switches the threshold voltage based on the comparison signal and the start-up 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 case that houses a circuit component includes a frame along a peripheral edge of a circuit board, and a cover assembled to the frame so as to cover the circuit board, and connectors, facing an outer peripheral side of the frame are provided in the frame. In corresponding surfaces of the cover and each of the connectors, a first rib, a second rib, a first rib receiving groove, and a second rib receiving groove are formed that can regulate passage of a liquid in clearances between the connectors and the cover by fitting of protrusions and recesses. This prevents or limits a liquid outside the frame from entering the frame through the clearances between the connectors and the cover.