Abstract: A switching power supply apparatus having a highly accurate overvoltage protection function which is free of erroneous operation is provided. A regulating circuit connected to an auxiliary winding generates an AC voltage proportional to a voltage component in which the ringing component has been removed from the AC voltage induced in the auxiliary winding by the switching operation of a switching element. If the peak value of the AC voltage generated by the regulating circuit is equal to or greater than a prescribed value, an overvoltage detection circuit controls the switching operation of the switching element so as to reduce the output DC voltage.

Abstract: The present invention includes a turn-off signal modulating circuit that periodically varies a turn-off timing of a switching element 2 at a preset modulation time after a current detection by a drain current detecting circuit 15, and by modulating the peak of a current flowing through the switching element 2, diffuses switching noise while preventing concentration of an oscillating frequency at a constant frequency even under a constant input voltage and a constant load.

Abstract: In the present invention, an on time is used which increases at an instantaneous interruption. The on time is detected by a MAX-DUTY detector 10 and the overload protection function of an overload protection circuit 150 is disabled.

Abstract: A semiconductor device for controlling a switching power supply is provided, which can reduce power consumption at a light load of the switching power supply and improve the efficiency of the power supply. During the intermittent switching operation of a switching element, when a return signal is outputted from a light load detection circuit within the set time of a transformer reset detection time setting circuit during intermittent stop, the switching operation of the switching element is restarted in response to a transformer reset signal from the transformer reset detection circuit after the return signal is outputted. When the return signal is outputted from the light load detection circuit during the intermittent stop after the set time of the transformer reset detection time setting circuit, the switching operation of the switching element is restarted regardless of the transformer reset signal only in response to the output of the return signal.

Abstract: In a semiconductor apparatus for controlling a switching power supply including a switching element and a switching operation control circuit, the switching operation of the switching element is controlled as follows: a comparison is made between an output voltage of an I-V converter, which detects the current of a control terminal and converts the current into a voltage, and a reference voltage of predetermined upper and lower limit voltages for detecting a standby state, and the switching operation of the switching element is stopped when the output voltage of the I-V converter is lower than the standby detection lower limit voltage, and the switching operation of the switching element is restarted when the output voltage of the I-V converter is higher than the standby detection upper limit voltage.

Abstract: A high-breakdown voltage semiconductor switching device includes a resurf region of a second conductivity type; a base region of a first conductivity type formed to be adjacent to the resurf region; an emitter/source region of the second conductivity type formed in the base region to be spaced from the resurf region; a gate electrode formed to cover a portion of the emitter/source region and a portion of the resurf region; a drain region of the second conductivity type formed in the resurf region to be spaced from the base region; and a collector region of the first conductivity type formed in the resurf region to be spaced from the base region. Furthermore, it includes an electrode connected to the collector region and the drain region and an electrode connected to the base region and the emitter/source region.

Abstract: In a semiconductor device for controlling switching power supply of this invention, having a switching element and switching operation control circuit, after receiving a current detection signal when switching is turned off, a fixed delay time is applied to the current detection signal by a delay circuit so that switching turn-on control by a transformer reset pulse signal obtained based on a signal from the tertiary windings of the transformer is not accepted within a blanking time corresponding to the delay time. Thus, the switching by the switching element is halted.

Abstract: A plurality of arrangements for detecting an overload of energy supplied to an output part enables selecting latch-off or auto-recovery overload protection by the operation of a switching device. When the drain current peak of the switching device exceeds a predetermined level denoting an overload, the FB pin voltage also rises to latch off, and when the drain current peak then reaches a maximum level, the CC pin voltage drops to a predetermined level and limits the oscillation period of the switching device because output power cannot be increased even if the load increases further. Latch-off overload protection can be applied when the drain current peak exceeding a predetermined level is detected, and auto-recovery overload protection can be applied when the CC pin voltage is detected to drop to a predetermined level.

Abstract: A CMP conditioner is provided in which diamond grit that is adhered to a conditioning surface so as to face and be in contact with a polishing pad of a CMP apparatus is adhered such that 111 surfaces of crystal surfaces of the diamond grit are substantially parallel with the conditioning surface and face in a direction faced by the conditioning surface.

Abstract: A semiconductor device (51) for controlling a switching power supply, includes a switching element (1) and a switching control circuit. During an intermittent switching operation of the switching element (1), when a return signal is outputted from a light load detection circuit (32) before the counting of a counter circuit (14), the switching operation of the switching element (1) is restarted at the timing of a transformer reset signal from a transformer reset detection circuit (13) after the return signal is outputted. When the return signal is outputted from the light load detection circuit (32) after the counting of the counter circuit (14), the switching operation of the switching element (1) is restarted, regardless of the transformer reset signal, only when the return signal is outputted.

Abstract: A semiconductor device for controlling a switching power supply is provided, which can reduce power consumption at a light load of the switching power supply and improve the efficiency of the power supply. During the intermittent switching operation of a switching element, when a return signal is outputted from a light load detection circuit within the set time of a transformer reset detection time setting circuit during intermittent stop, the switching operation of the switching element is restarted in response to a transformer reset signal from the transformer reset detection circuit after the return signal is outputted. When the return signal is outputted from the light load detection circuit during the intermittent stop after the set time of the transformer reset detection time setting circuit, the switching operation of the switching element is restarted regardless of the transformer reset signal only in response to the output of the return signal.

Abstract: A CMP conditioner is provided in which diamond grit that is adhered to a conditioning surface so as to face and be in contact with a polishing pad of a CMP apparatus is adhered such that 111 surfaces of crystal surfaces of the diamond grit are substantially parallel with the conditioning surface and face in a direction faced by the conditioning surface.

Abstract: The present invention provides a switching power supply which reduces power consumption in a standby state and improves power supply efficiency. At the time of starting a standby mode in which the output voltage VFB of the IV converter exceeds a standby detection upper limit voltage from a reference voltage source, the switching operation of the switching element is stopped. This stopping reduces the output voltage VFB of the IV converter along with a power supply voltage VO. When the output voltage VFB is lower than a standby detection lower limit voltage from the reference voltage source, the switching operation of the switching element is resumed.

Abstract: A semiconductor device (51) for controlling a switching power supply, includes a switching element (1) and a switching control circuit. During an intermittent switching operation of the switching element (1), when a return signal is outputted from a light load detection circuit (32) before the counting of a counter circuit (14), the switching operation of the switching element (1) is restarted at the timing of a transformer reset signal from a transformer reset detection circuit (13) after the return signal is outputted. When the return signal is outputted from the light load detection circuit (32) after the counting of the counter circuit (14), the switching operation of the switching element (1) is restarted, regardless of the transformer reset signal, only when the return signal is outputted.

Abstract: In a semiconductor device for controlling switching power supply of this invention, having a switching element and switching operation control circuit, after receiving a current detection signal when switching is turned off, a fixed delay time is applied to the current detection signal by a delay circuit so that switching turn-on control by a transformer reset pulse signal obtained based on a signal from the tertiary windings of the transformer is not accepted within a blanking time corresponding to the delay time. Thus, the switching by the switching element is halted.

Abstract: In a semiconductor apparatus for controlling a switching power supply including a switching element and a switching operation control circuit, the switching operation of the switching element is controlled as follows: a comparison is made between an output voltage of an I-V converter, which detects the current of a control terminal and converts the current into a voltage, and a reference voltage of predetermined upper and lower limit voltages for detecting a standby state, and the switching operation of the switching element is stopped when the output voltage of the I-V converter is lower than the standby detection lower limit voltage, and the switching operation of the switching element is restarted when the output voltage of the I-V converter is higher than the standby detection upper limit voltage.

Abstract: A first encoding section encodes an original picture S(1) and outputs it to a communication line of a first channel. The encoded image data is decoded in a first decoding section. This decoded data C(1) is input to a first compensation section. The first compensation section uses the original picture S(1) and the decoded data C(1) as the input, and performs calculation of the following expression (1) to thereby generate a first compensated original picture S(2): S ? ( i + 1 ) = ( S ? ( 1 ) × i - ? k = 1 i ? C ? ( k ) ) / ( N - i ) + S ? ( 1 ) ( 1 ) wherein i=2 to N, and N denotes the total number of channels in image encoding. The first compensated original picture S(2) is encoded in a second encoding section and output from a communication line of a second channel. Thereafter, similar operation is performed for the total number of channels N.

Abstract: The present invention provides a switching power supply which reduces power consumption in a standby state and improves power supply efficiency. At the time of starting a standby mode in which the output voltage VFB of the IV converter exceeds a standby detection upper limit voltage from a reference voltage source, the switching operation of the switching element is stopped. This stopping reduces the output voltage VFB of the IV converter along with a power supply voltage VO. When the output voltage VFB is lower than a standby detection lower limit voltage from the reference voltage source, the switching operation of the switching element is resumed.

Abstract: In the electrodeposited abrasive wheel 20 of the abrasive tool according to the present invention, plural mound parts 21, which are upheaved at the central domain of base metal 19 in almost columnar shape, are arranged mostly in the shape of lattice. An abrasive grain layer 22 is formed on a base metal 19, and plural ultra abrasive grains 14 are adhered only to each mound parts 21 by electrodeposited metal phase 25, and referred as the small abrasive-grain-layer parts 24, respectively. Ultra abrasive grains are laid out at corner R part 21a and top 21b of the mound parts 21 at the small abrasive-grain-layer parts 24. Ultra abrasive grains at each small abrasive-grain-layer parts are set as 11-500 pieces, and the rate which ultra abrasive grains occupy to the whole area of abrasive grain layer accounted by plane projection is set as 20%-80% of the range.

Abstract: A first encoding section encodes an original picture S(1) and outputs it to a communication line of a first channel. The encoded image data is decoded in a first decoding section. This decoded data C(1) is input to a first compensation section.