Patent application number | Description | Published |
20100182807 | Synchronous Rectifier Circuit Capable of Preventing Flow-Through Current - A synchronous rectifier circuit (DC-DC converter) includes a CR integration circuit and a discharge circuit. The CR integration circuit outputs a voltage that varies at delayed timing as compared with a voltage induced in a secondary-side main winding. The discharge circuit discharges a gate voltage of a rectifier transistor as a result of conduction of a discharge transistor in response to the output voltage from the CR integration circuit. According to such a configuration, the rectifier transistor is turned off earlier than the timing of switching of polarity of voltages induced in the secondary-side main winding and a secondary-side auxiliary winding in response to turn-on of a primary-side transistor. | 07-22-2010 |
20100214810 | Push-Pull Inverter - A push-pull inverter allows a power supply unit to supply an input voltage to two primary windings of a transformer, and allows MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) to drive the transformer in push-pull mode so as to increase the input voltage supplied from the power supply unit and to output the increased voltage as an output voltage from a secondary winding of the transformer. The two primary windings of the transformer are mixedly wound on a same bobbin without being separated, so that when the transformer is driven, the two primary windings of the transformer are prevented from resonating with each other. This makes it possible to prevent turbulence in the input current, thereby reducing loss (power loss) of the MOSFETs, allowing the transformer to have a high efficiency. | 08-26-2010 |
20140078680 | Power Supply Device and Display Device - This power supply device includes a substrate, a transformer mounted on a first surface of the substrate, and a switch element electrically connected to the transformer, mounted on a second surface of the substrate, while the switch element is arranged in a position different from a position on the second surface corresponding to a position on the first surface in which the transformer is mounted. | 03-20-2014 |
20140218977 | SWITCHING POWER SUPPLY CIRCUIT - A switching power supply circuit includes a switching element that switches power fed to a primary winding of a transformer and thus induces a voltage in the secondary winding, and an oscillation circuit that oscillates to generate a pulse signal to control switching action. The oscillation circuit repeatedly performs intermittent oscillation of the pulse signal, and in each of the intermittent oscillation cycles, increases or decreases the number of pulses in the pulse signal to lengthen or shorten the oscillating portion of the pulse signal, and at the time of lengthening or shortening, the oscillation circuit respectively lengthens or shortens an oscillation-halted portion, thus varying the period of the intermittent oscillation cycles. | 08-07-2014 |
Patent application number | Description | Published |
20080252796 | Liquid crystal television and backlight unit - A liquid crystal television | 10-16-2008 |
20090026974 | FLUORESCENT TUBE POWER SUPPLY AND BACKLIGHT - A fluorescent tube power supply including an inverter power supply which outputs a DC voltage, and an inverter which converts an output of the inverter power supply to an AC; wherein a power stabilizing unit for stabilizing a power input to the inverter is arranged between the inverter power supply and the inverter; and a feedback control of the inverter power supply is performed based on an output of the power stabilizing unit. The power stabilizing unit detects a current flowing between the inverter power supply and the inverter, and the feedback control of the inverter power supply is performed based on the current. | 01-29-2009 |
20090033237 | FLUORESCENT TUBE POWER SUPPLY AND BACKLIGHT - A fluorescent tube power supply including a rectification circuit, a smoothing circuit, an inverter, and a control circuit for controlling the inverter, further includes a current detecting unit for detecting an input current of the inverter. The control circuit is stopped based on an output signal of the current detecting unit when the input current increases. | 02-05-2009 |
20090033810 | SELF-EXCITED INVERTER AND LCD TELEVISION APPARATUS - A self-excited inverter comprises a pair of switching devices and a transformer having a primary side to which the switching devices are connected and a secondary side to which a lamp is connected. A pulse voltage is applied alternately to gates of the individual switching devices through a drive winding of the transformer, causing the switching devices to turn on and off in alternate turns to produce an AC voltage which is supplied from a pair of main windings of the transformer to the secondary side thereof. An input voltage supplied to the main windings of the transformer is divided by a voltage divider circuit configured with a plurality of resistors and voltages divided by the voltage divider circuit are applied to the gates of the individual switching devices so that the startup voltage follows the input voltage. | 02-05-2009 |
20090060247 | MICROPHONE HOLDER AND MICROPHONE DEVICE USING SAME - A microphone device according to the present invention comprises a plurality of microphones and a microphone holder for holding the microphones. The microphones include a first sound receiving part and a second sound receiving part. The microphone holder comprises a holder body, and the holder body includes a plurality of microphone engaging recesses facing in different directions from each other and to be removably in engagement with the plurality of microphones. These microphone engaging recesses are to be in engagement with the plurality of microphones with the first sound receiving part facing the outer side of the holder body. | 03-05-2009 |
20120063613 | RECORDING APPARATUS, RECORDING CONDITION SETTING METHOD, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM ENCODED WITH RECORDING CONDITION SETTING PROGRAM - A recording apparatus includes: a plurality of microphones having directivity to output collected sound; a switch portion to switch a direction of directivity of each of the plurality of microphones to one of a plurality of predetermined direction patterns; a detection portion to detect a direction pattern switched by the switch portion among the plurality of direction patterns; a recording portion to execute plural kinds of processing on sound collected by the plurality of microphones and to record the processed sound; a setting portion to set parameters to be used by the recording portion to execute the plural kinds of processing; and a storage portion to store the parameters to be used by the recording portion to execute the plural kinds of processing, separately for each of the plural kinds of processing, in association with each of the plurality of direction patterns. When a direction pattern switched by the switch portion is detected by the detection portion, the setting portion sets the parameters to be used to execute plural kinds of processing that are associated with the detected direction pattern. | 03-15-2012 |
20130177191 | AUDIO RECORDER - An audio recorder having a plurality of microphones including at least a first microphone and a second microphone provided in a first housing and a second housing, respectively, at least one of the first housing and the second housing being rotatably supported, and having an audio recording function in a set prescribed audio recording mode, in which the first housing and the second housing are arranged vertically one above the other, and the audio recorder has means for setting a prescribed audio recording mode in accordance with a relative position of the first microphone and the second microphone. According to this audio recorder, the prescribed audio recording mode is set in accordance with the relative position of the first housing and the second housing. Thus, a desired audio recording mode can be set more intuitively by a user. | 07-11-2013 |