摘要:
A wireless device wherein a first reception block carries out carrier sensing operation to check a condition of interfering wave before a first transmission block transmits a signal, and the first reception block halts operation thereof and makes the first transmission block transmit the signal when the first reception block confirms that the condition of interfering wave is within a predetermined range, or executes retry operation for carrying out the career sensing operation again when it confirms that the condition of interfering wave is outside of the predetermined range as a result of the career sensing operation.
摘要:
A power supply controller includes a power supply section, a power supply controlling section connected to the power supply section, a starter switch being switched selectively to a first status and a second status, a o power switch being switched selectively to a first status and a second status, a controlling section connected to the power switch, and a function section operable to execute a predetermined operation. The power supply controlling section causes a power to be supplied from the power supply section to the controlling section when at least one of the power switch and the starter switch is in the first status. This power supply controller does not malfunction even when the starter switch malfunctions, thus preventing wasteful consumption of the power supply section.
摘要:
A wireless sensor system includes a wireless sensor, a wireless device, and a magnetic field generator connected to the wireless device. The wireless sensor includes an ambience sensor that detects status of an ambient environment to output ambient data depending on the detected status of the ambient environment, a magnetic sensor that senses a magnetic field, a radio-frequency (RF) transmitter that sends the ambient data to the wireless device using a radio wave, and a first controller that is connected to the ambience sensor, the magnetic sensor, and the RF transmitter. The wireless device includes an RF receiver that receives the radio wave sent from the RF transmitter; and a second controller that is connected to the RF receiver and that outputs a control signal for controlling the first controller. The magnetic field generator includes a coil for sending the control signal to the magnetic sensor using a magnetic field.
摘要:
Provided is a switching power supply apparatus capable of suppressing heat generation from a power supply to improve the efficiency of conversion during a power supply operation and accurately detecting only a current flowing through a load to achieve more stabile control. Since a first closed loop made up of a fourth diode (27d), a third inductor (25c) and a fourth electronic switch (24d) and a second closed loop made up of a second diode (27b), a first inductor (25a) and a second electronic switch (24b) do not include a fourth inductor (25d) and a second inductor (25b) through which an AC output current supplied to a load (28) flows, an unnecessary current does not flow through the first or second closed loop.
摘要:
A cold-cathode tube lighting device uniformly lights multiple cold-cathode tubes using a common power source, and the cold-cathode tube lighting device is effectively downsized by using ballast capacitors. A substrate is divided into blocks as many as the cold-cathode tubes. Each of the blocks includes two conductor layers each including two foils. A first foil of a first conductor layer is connected to a common low-impedance power supply. Between the two conductor layers, first ballast capacitors are formed in areas where the first foils are overlapped, second ballast capacitors are formed in areas where the first and second foils are overlapped, and the third ballast capacitors are formed in areas where the second foils are overlapped. Second foils are connected to first electrodes of the cold-cathode tubes.
摘要:
A cold-cathode tube lighting device uniformly lights a plurality of cold-cathode tubes using a common power source, and maintains the luminance of each cold-cathode tube uniformly in the longitudinal direction thereof at high precision. A first block converts a direct-current voltage to one pair of alternating-voltages. Since leakage impedances of step-up transformers are low, the first block functions as one pair of low-impedance power sources. Each second block is connected to each cold-cathode tube. A ballast inductor stabilizes tube current by resonating with a matching capacitor during lighting of the cold-cathode tube. A combined impedance of the matching capacitor and a peripheral stray capacitance is matched with an impedance of the ballast inductor, for each cold-cathode tube. Since a delay circuit shifts phases of two pulse waves with respect to each other, a phase difference between the alternating-voltages is shifted from 180°.
摘要:
Provided is a switching power supply apparatus capable of suppressing heat generation from a power supply to improve the efficiency of conversion during a power supply operation and accurately detecting only a current flowing through a load to achieve more stabile control. Since a first closed loop made up of a fourth diode (27d), a third inductor (25c) and a fourth electronic switch (24d) and a second closed loop made up of a second diode (27b), a first inductor (25a) and a second electronic switch (24b) do not include a fourth inductor (25d) and a second inductor (25b) through which an AC output current supplied to a load (28) flows, an unnecessary current does not flow through the first or second closed loop.
摘要:
A first block (1) converts a DC voltage (Vi) into an AC voltage (V) of a high frequency, using a high-frequency oscillator circuit (4) and a step-up transformer (5). The first block (1) acts as a low-impedance power supply owing to suppression of leakage flux in the step-up transformer (5). A second block (2) and a third block (3) are connected to each CCFL (20). A ballast inductor (LB) causes the CCFL (20) to shine through the resonance with a matching capacitor (CM), and then maintains the stable lamp current during shining of the CCFL (20). The capacitance of the matching capacitor (CM) is separately adjusted for each CCFL (20), and thereby, the total impedance of the matching capacitor (CM) and the surrounding stray capacitances is matched to the impedance of the series connection of the ballast inductor (LB) and an overcurrent protection capacitor (CP).
摘要:
A portable device has a main body and an image receiver detachable from the main body. The image receiver includes an antenna, an antenna matching unit, and a tuner provided in that order from the input side. The image receiver further includes a noise cancelling unit, which supplies a noise-cancelling signal to between the antenna matching unit and the tuner.
摘要:
A cold-cathode tube lighting device uniformly lights multiple cold-cathode tubes using a common power source, and the cold-cathode tube lighting device is effectively downsized by using ballast capacitors. A substrate is divided into blocks as many as the cold-cathode tubes. Each of the blocks includes two conductor layers each including two foils. A first foil of a first conductor layer is connected to a common low-impedance power supply. Between the two conductor layers, first ballast capacitors are formed in areas where the first foils are overlapped, second ballast capacitors are formed in areas where the first and second foils are overlapped, and the third ballast capacitors are formed in areas where the second foils are overlapped. Second foils are connected to first electrodes of the cold-cathode tubes.