69results about How to "Suppress radiated noise" patented technology

A multilayered printed circuit board includes a first surface layer that includes a semiconductor integrated circuit, a second surface layer that includes a bypass capacitor and that is opposite to the first surface layer, a main power supply wiring layer, and a ground layer between the first and second surface layers. In the multilayered printed circuit board, one terminal of the bypass capacitor is connected to a midpoint of a wiring path from the main power supply wiring layer to a power supply terminal of the semiconductor integrated circuit, and an impedance of a first wiring path from the main power supply wiring layer to the terminal of the bypass capacitor is higher than an impedance of a second wiring path from the terminal of the bypass capacitor to the power supply terminal of the semiconductor integrated circuit.

A lighting circuit includes a DC / DC converting circuit for boosting an input DC voltage so as to produce boosted DC power, a detecting circuit for producing a detection signal in response to the output voltage of the DC / DC converting circuit, a DC / AC converting circuit for producing AC power to be supplied to the discharge tube from the boosted DC power, a starting circuit for starting up the discharge tube, and a control circuit for receiving the detection signal from the detecting circuit. The control circuit contains a capacitor which is charged based upon the detection signal, a first discharging unit for discharging the capacitor, a second discharging unit for providing a discharging path for the capacitor in response to turning-OFF of the input DC voltage, and a signal producing unit for producing a control signal used to adjust the output of the DC / DC converting circuit in response to a terminal voltage of the capacitor.

A multilayered printed circuit board includes a first surface layer that includes a semiconductor integrated circuit, a second surface layer that includes a bypass capacitor and that is opposite to the first surface layer, a main power supply wiring layer, and a ground layer between the first and second surface layers. In the multilayered printed circuit board, one terminal of the bypass capacitor is connected to a midpoint of a wiring path from the main power supply wiring layer to a power supply terminal of the semiconductor integrated circuit, and an impedance of a first wiring path from the main power supply wiring layer to the terminal of the bypass capacitor is higher than an impedance of a second wiring path from the terminal of the bypass capacitor to the power supply terminal of the semiconductor integrated circuit.

An engine starting device for controlling an engine start of a vehicle by driving a starter relay of the vehicle with a battery of the vehicle as a power supply has a control processing unit and a step-up circuit for stepping up the output of the battery and outputting a drive voltage for driving the control processing unit and the starter relay. The control processing unit has a function of performing an engine start control of applying the drive voltage to the starter relay to activate the starter relay in time of the engine start at which an engine starting condition is satisfied The control processing unit performs a control function on the step-up circuit to activate the step-up circuit so that the drive voltage does not become lower than a minimum operation voltage of the starter relay in a predetermined period necessary to start the engine in time of the engine start, and activate the step-up circuit so that the drive voltage does not become lower than a first voltage value higher than a minimum operation voltage of the control processing unit and lower than the minimum operation voltage of the starter relay when not in the predetermined period.

At least one of a feedback path and a feed path is divided into two paths, and the divided feedback path and the feed path for feeding a signal form a twisted pattern to suppress radiation noise of a high frequency by a twisted pair effect. The other divided feedback path decreases a resistance value of a direct current component and decreases a whole direct current resistance to feed a sufficient current to the path.

A printed wiring board, comprising a signal plane having a baseband block for processing a baseband signal and a high-frequency block for processing a high-frequency signal which is obtained by converting the baseband signal, and a ground plane opposing to the signal plane. The baseband block and the high-frequency block are connected through a transmission line for transmitting a signal of a specific frequency region. The ground plane is provided with a first ground portion and a second ground portion, the first ground portion being provided at an area opposing to the baseband block, the second ground portion being provided at an area opposing to the high-frequency block. The first ground portion and the second ground portion are coupled to each other through a coupling portion provided therebetween which has a low impedance with respect to the signal of the specific frequency region.

According to the invention, information processing equipment using a flexible printed-circuit board which does not lose bendability with repeated opening and closing of a display unit, and which suppresses radiation noise from signal wiring is provided.In the configuration of the invention, a first cover film is formed to cover a wiring layer on a first surface of a base film, and a second cover film is formed to cover a wiring layer on a second surface of the base film. Portions of the second cover film and the underlying wiring layer on the second surface in the loop formation region are discontinuously removed in the inward-bending area of the loop, and the base film is exposed in the removed parts. The wiring layer underneath the remaining second cover film, which is not removed, and the wiring layer on the first surface of the base film are electrically connected via through holes penetrating the base film.

To speed up the communication between the indoor unit and outdoor unit of an air conditioner and suppress the radiant noise by the communication. In the separate type air conditioner comprising the indoor unit 1 having an indoor blower 19, a control system means (including a microcomputer 7, a decoding circuit 9 and a modulating driver 12) and a temperature detection means 18; and the outdoor unit 2 having an outdoor blower 35, a refrigerant compressor 36, a control system means, and a temperature detection means 21, two connecting cables 3 and 4 for supplying AC power and one communication cable 5 for communication are provided between the indoor unit and the outdoor unit, and high frequency transformers 14 and 25 in which both ends of primary windings are connected to one connecting cable 4 and the communication cable 5 are provided on the indoor unit 1 and the outdoor unit 2, respectively. Capacitors 15 and 27 are connected in parallel to the primary windings of the high frequency transformers to form parallel resonance circuits to make an alternating signal to be carried to the communication cable 5 to a sine wave-like waveform close to a sine wave.

The invention discloses a noise identification method in a power line carrier communication fault detection system and belongs to the technical field of electromagnetic compatibility technologies. M sets of measured near field time domain signals of a detected device form an observation signal x(t) used for a matrix, the observation signal x(t) is subjected to independent component analysis, in other words, a separation matrix W is searched for, the y=Wx is made to have highest Gaussianity, after whitening processing is performed, the x(t) is substituted into a Newton iterative formula and separated into M independent near field time domain signals, and waveforms of the M independent near field time domain signals are compared with those of far field time domain signals of the detected device so that signals causing standard exceeding of radiation noise can be determined. The method is simple, efficient and systematized better, frequency points of standard exceeding radiation noise to detected products can be accurately recognized, and therefore a radiation source can be rectified and reformed in a targeted mode, and radiation noise of the radiation source is suppressed.

A printed wiring board, comprising a signal plane having a baseband block for processing a baseband signal and a high-frequency block for processing a high-frequency signal which is obtained by converting the baseband signal, and a ground plane opposing to the signal plane. The baseband block and the high-frequency block are connected through a transmission line for transmitting a signal of a specific frequency region. The ground plane is provided with a first ground portion and a second ground portion, the first ground portion being provided at an area opposing to the baseband block, the second ground portion being provided at an area opposing to the high-frequency block. The first ground portion and the second ground portion are coupled to each other through a coupling portion provided therebetween which has a low impedance with respect to the signal of the specific frequency region.

A connector is mateable with and removable from a mating connector, which has an optical connector, along a mating direction. The connector is provided with a receptacle to be attached to a case and an adapter to be mounted on a circuit board located in the case. The adapter has an inner module to be connected to the optical connector and a cage which accommodates the inner module at least in part. One of the receptacle and the cage is provided with a contact portion which is in contact with a remaining one of the receptacle and the cage. The receptacle and the cage are electrically connected to each other through the contact portion without direct fixation between the receptacle and the cage.

A wiring board (lead frame) has a configuration in which a high-frequency current suppression member formed of a conductive soft magnetic film having high magnetic permeability is provided in a near field (magnetic field dominant area) in a lead frame part (wiring part) which can be a radiation noise source, preferably, in the periphery of the lead frame part.

An engine starting device for controlling an engine start of a vehicle by driving a starter relay of the vehicle with a battery of the vehicle as a power supply has a control processing unit and a step-up circuit for stepping up the output of the battery and outputting a drive voltage for driving the control processing unit and the starter relay. The control processing unit has a function of performing an engine start control of applying the drive voltage to the starter relay to activate the starter relay in time of the engine start at which an engine starting condition is satisfied The control processing unit performs a control function on the step-up circuit to activate the step-up circuit so that the drive voltage does not become lower than a minimum operation voltage of the starter relay in a predetermined period necessary to start the engine in time of the engine start, and activate the step-up circuit so that the drive voltage does not become lower than a first voltage value higher than a minimum operation voltage of the control processing unit and lower than the minimum operation voltage of the starter relay when not in the predetermined period.

At least one of a feedback path and a feed path is divided into two paths, and the divided feedback path and the feed path for feeding a signal form a twisted pattern to suppress radiation noise of a high frequency by a twisted pair effect. The other divided feedback path decreases a resistance value of a direct current component and decreases a whole direct current resistance to feed a sufficient current to the path.

There is provided an X-ray detection system comprising a detector and a data acquisition unit. The detector detects an X-ray passing through a body being examined and producing an analog electric signal corresponding to the X-ray for each channel. The data acquisition unit includes a plurality of circuit blocks each including as many circuits as the number of channels assigned to each block. The data acquisition unit converts the analog electric signal output from the detector into a digital signal for each channel and outputting the resultant digital signal and a phase control unit controlling the phase of the circuit blocks of the data acquisition unit such that the circuit blocks are grouped into a plurality of groups and the respective groups of circuit blocks operate in synchronization with clock signals whose phase are different at least between two groups.

The invention discloses an electromagnetic compatibility design method for a low-light image intensifier. The method, by separately performing electromagnetic compatibility design on a high-voltage power source, an image intensifier tube and a whole casing which constitute the low-light image intensifier, solves the contradiction between the volume weight limitation and the electromagnetic compatibility of a conventional low-light image intensifier, improves the anti-interference ability of the low-light image intensifier under a strong electromagnetic interference environment and improves theworking stability of the low-light image intensifier.

In the transient electric power control of a discharge lamp containing no mercury or a small amount of mercury, a change value relating to a lamp voltage from the initial value thereof is detected. A control unit is provided to change the temporal change rate of electric power supplied to the discharge lamp during the transient time period in accordance with the increase of the change value or the time lapse.

A flat cable (301) is arranged in the direction of the reciprocating movement of a carriage (122), and inputs a synchronization signal to a substrate mounted on the carriage (122). When the flat cable (301) undergoes bending deformation in response to the reciprocating movement of the carriage (122) and portions of the flat cable (301) oppose one other as a result of the bending deformation, a conductive plate (311) is supported by a case (331) while interposed between the opposing portions of the flat cable (301). Elastic members (312) electrically connect the conductive plate (311) and a grounding member (321), and have a substantial inductance component which absorbs vibration generated in an image formation unit (140) or an image reading unit (120).

A motor driving system includes an AC power supply 1, an AC reactor 2, a power converter 3 and a motor 4. A microsurge suppressor 5 is inserted on a power supply line from the power converter 3 to the motor 4 and the similar microsurge suppressor 6 is inserted on a power supply line from the AC reactor 2 to the power converter 3. The microsurge suppressor 5 includes a multi-layer printed wiring board having two terminals connected to the power converter 3 and the motor 4 and a capacitor for bypassing a surge, and the terminal 4 on the side of the motor of the multi-layer printed wiring board is directly connected to a terminal of the motor 4. The capacitor for bypassing a surge is connected between the terminal of the motor 4 and the end on the side of a second terminal of second wiring.

A motor driving system includes an AC power supply 1, an AC reactor 2, a power converter 3 and a motor 4. A microsurge suppressor 5 is inserted on a power supply line from the power converter 3 to the motor 4 and the similar microsurge suppressor 6 is inserted on a power supply line from the AC reactor 2 to the power converter 3. The microsurge suppressor 5 includes a multi-layer printed wiring board having two terminals connected to the power converter 3 and the motor 4 and a capacitor for bypassing a surge, and the terminal 4 on the side of the motor of the multi-layer printed wiring board is directly connected to a terminal of the motor 4. The capacitor for bypassing a surge is connected between the terminal of the motor 4 and the end on the side of a second terminal of second wiring.

A connector is mateable with and removable from a mating connector, which has an optical connector, along a mating direction. The connector is provided with a receptacle to be attached to a case and an adapter to be mounted on a circuit board located in the case. The adapter has an inner module to be connected to the optical connector and a cage which accommodates the inner module at least in part. One of the receptacle and the cage is provided with a contact portion which is in contact with a remaining one of the receptacle and the cage. The receptacle and the cage are electrically connected to each other through the contact portion without direct fixation between the receptacle and the cage.

A developing device includes multiple developing units, and multiple toner concentration sensors. The multiple developing units contain respective developers. The multiple toner concentration sensors have respective LC oscillator circuits and are disposed at the respective multiple developing units. A capacitor constituting the LC oscillator circuit differs in capacitance at each of the toner concentration sensors installed on the multiple developing units. The electrostatic capacity of capacitors which are arranged on the toner concentration sensors of the developing units forming the LC oscillator circuits is different. Thus, detection precision of toner concentration can be ensured and devices can be restrained from generating irradiation noise.

The invention provides a device for suppressing radiation noise of a plate, the plate and a vehicle. The device for suppressing the radiation noise of the plate comprises a soundproof part. The soundproof part comprises a soundproof material part used for being installed on the plate, and a cavity is formed between the soundproof material part and the plate. The device for suppressing the radiation noise of the plate is simple in structure, and the requirement for the manufacturing technology is low, so that the cost of the device for suppressing the radiation noise of the plate is low; in addition, as the cavity is formed between the soundproof material part and the plate, parts of sound waves are reflected by the soundproof material part to be further weakened in the cavity, parts of the sound waves are absorbed by the soundproof material part, and then radiation of the noise of the plate is effectively suppressed.

An A / D converter comprising: a sampling circuit including a continuous section, a sampling and holding section for intermittently sampling an input signal based on an analog signal input from the continuous section to hold and transfer the sampled signal, and a digital section for outputting a signal transferred from the sampling and holding section as a digital signal; and a control circuit for supplying a clock signal in which jitter is not added to the continuous section and supplying a clock signal in which the jitter is added to the sampling and holding section.

On a surface layer of a printed wiring board, main power supply patterns to be applied with different DC voltages are disposed in a second region. Power supply patterns are disposed on the surface layer, and the power supply patterns are led from the main power supply patterns to a first region. The power supply patterns connect power supply terminals of terminal groups in the second region. The power supply patterns connect the power supply terminals between the terminal groups in the first region. Power supply terminals of the terminal groups of a semiconductor package are electrically connected to the main power supply patterns by the power supply patterns. Thus, potential fluctuations are reduced and radiation noise is suppressed, and the number of layers of the printed wiring board is reduced.

To speed up the communication between the indoor unit and outdoor unit of an air conditioner and suppress the radiant noise by the communication. In the separate type air conditioner comprising the indoor unit 1 having an indoor blower 19, a control system means (including a microcomputer 7, a decoding circuit 9 and a modulating driver 12) and a temperature detection means 18; and the outdoor unit 2 having an outdoor blower 35, a refrigerant compressor 36, a control system means, and a temperature detection means 21, two connecting cables 3 and 4 for supplying AC power and one communication cable 5 for communication are provided between the indoor unit and the outdoor unit, and high frequency transformers 14 and 25 in which both ends of primary windings are connected to one connecting cable 4 and the communication cable 5 are provided on the indoor unit 1 and the outdoor unit 2, respectively. Capacitors 15 and 27 are connected in parallel to the primary windings of the high frequency transformers to form parallel resonance circuits to make an alternating signal to be carried to the communication cable 5 to a sine wave-like waveform close to a sine wave.

An ignition apparatus for an internal combustion engine can suppress radiation noise radiated into air from a discharge current path, thereby preventing the malfunction of electrical equipment mounted on a vehicle. The ignition apparatus includes a transformer having a primary winding and a secondary winding, a conductor for impressing a high voltage generated at a high voltage side of the secondary winding upon interruption of a primary current to the primary winding to a spark plug, a plug boot enclosing the conductor so as to electrically insulate it from the outside and to hold the spark plug, and a metal sleeve arranged to enclose the plug boot and having one end thereof electrically connected directly or indirectly to a low voltage side of the secondary winding, and the other end thereof electrically connected directly or indirectly to the spark plug.

An electronic device includes a substrate (101), a conductor plane (104) which is provided on an inner layer of the substrate (101), an electronic circuit (102) which is mounted on the substrate (101), a heat sink (103) which is mounted on an upper surface of the electronic circuit (102), includes a portion which does not overlap with the electronic circuit (102) when seen in a plan view, faces the conductor plane (104), and is configured of a conductive material, a conductor via (105) which is connected to the heat sink (103) on a surface of the heat sink (103) contacting the electronic circuit (102), and extends toward the conductor plane (104), and a stub (106) which is connected to the conductor via (105) and extends to face the conductor plane (104).