Abstract: The present invention is a switching power source device which converts AC power of an AC power source into DC power and outputs the DC power, the device including: a rectifying-smoothing circuit configured to output a rectified-smoothed voltage signal obtained by rectifying and smoothing an AC voltage of the AC power source; a transformer having a primary winding, a secondary winding, and an auxiliary winding; a switching element connected to the primary winding of the transformer; and a control circuit configured to turn the switching element on and off based on a voltage signal which is based on an average value of current flowing through the switching element and the rectified-smoothed voltage signal from the rectifying-smoothing circuit.

Abstract: An LED illumination system includes: a load including an LED lamp; and a power supply device, the LED lamp configured to be physically mounted on and demounted from the power supply device, the power supply device comprising: a current feedback control unit; a first voltage comparison unit configured to determine whether the load is in a mounted state; a voltage feedback control unit configured to decrease the voltage of the power supply device to a safe voltage when demounting, and to increase the voltage of the power supply device to perform the constant current control when mounting; and a semiconductor switch element connected in series between the load and the detection resistor, wherein the mounted and demounted states of the load is detected by a voltage of a main electrode of a high potential side of the semiconductor switch element.

Abstract: An LED driving apparatus converts AC input power into predetermined DC output power and supplies the DC output power to an LED load. The LED driving apparatus includes a switching element Q1 to be turned on and off, a ripple current reducer 3a that is connected in series with the LED load and reduces current ripples of the LED load, and a controller CNT that turns on and off the switching element according to a feedback voltage taken from a connection point of the LED load and ripple current reducer, thereby controlling the DC output power to a predetermined value.

Abstract: The present invention is a switching power source device which converts AC power of an AC power source into DC power and outputs the DC power, the device including: a rectifying-smoothing circuit configured to output a rectified-smoothed voltage signal obtained by rectifying and smoothing an AC voltage of the AC power source; a transformer having a primary winding, a secondary winding, and an auxiliary winding; a switching element connected to the primary winding of the transformer; and a control circuit configured to turn the switching element on and off based on a voltage signal which is based on an average value of current flowing through the switching element and the rectified-smoothed voltage signal from the rectifying-smoothing circuit.

Abstract: A DC power-supply apparatus of converting an AC input voltage rectified to a DC voltage and supplying it to a load, by performing on-and-off control of a switching element connected in series to a reactor, includes a control circuit, which operates in floating state with respect to a after-rectified ground line and controls an on-width of the switching element based on a value of current flowing through the reactor and the load connected in series with the reactor; and an oscillation circuit, which controls a switching frequency of the on-and-off control by the control circuit, asynchronously with energy release timing of the reactor.

Abstract: A switching power-supply apparatus includes: a control circuit that controls on-and-off switching of a switching element; a first rectifying-and-smoothing circuit that smoothes a voltage generated in a secondary winding; and a second rectifying-and-smoothing circuit that smoothes a voltage generated in a tertiary winding as a power supply voltage, a starting circuit that supplies: a first constant current to the control circuit when the power supply voltage is equal to or lower than a first threshold voltage, which is lower than a starting voltage of the control circuit, and is larger than the starting voltage of the control circuit, as a starting current; and a second constant current, which is greater than the first constant current, to the control circuit when the power supply voltage is larger than the first threshold voltage and is equal to or lower than the starting voltage, as the starting current.

Abstract: An LED illumination system includes: a load including an LED lamp; and a power supply device, the LED lamp configured to be physically mounted on and demounted from the power supply device, the power supply device comprising: a current feedback control unit; a first voltage comparison unit configured to determine whether the load is in a mounted state; a voltage feedback control unit configured to decrease the voltage of the power supply device to a safe voltage when demounting, and to increase the voltage of the power supply device to perform the constant current control when mounting; and a semiconductor switch element connected in series between the load and the detection resistor, wherein the mounted and demounted states of the load is detected by a voltage of a main electrode of a high potential side of the semiconductor switch element.

Abstract: A DC/AC converter includes: a resonant circuit including a transformer having a primary winding and a secondary winding and at least one capacitor, in which the capacitor is connected to at least one of the primary winding and secondary winding of the transformer, and an output terminal to which the load is to be connected is provided on the secondary winding side; a switching circuit connected to both ends of a direct current power supply and having a bridge configuration composed of switching elements for flowing a current through the primary winding of the transformer and the capacitor in the resonant circuit; and a control circuit that turns on/off the switching elements by a pair of drive signals, and flows a current through the load bidirectionally, thereby performs a PWM control for the current flowing through the load, wherein the control circuit includes step drive circuits which turn on the switching elements in steps, and the step drive circuits are provided so as to individually correspond to the

Abstract: An LED driving apparatus converts AC input power into predetermined DC output power and supplies the DC output power to an LED load. The LED driving apparatus includes a switching element Q1 to be turned on and off, a ripple current reducer 3a that is connected in series with the LED load and reduces current ripples of the LED load, and a controller CNT that turns on and off the switching element according to a feedback voltage taken from a connection point of the LED load and ripple current reducer, thereby controlling the DC output power to a predetermined value.

Abstract: Each of discharge lamp lighting apparatus that are connected to a common line includes a sawtooth-wave oscillator to generate a sawtooth signal for PWM-controlling a plurality of switching elements passing a current through a primary winding of a transformer and a capacitor of a resonant circuit connected to a discharge lamp, a PWM comparator controlling the plurality of switching elements according to the sawtooth signal, and a pulse synchronization circuit providing the common line with a synchronization pulse signal based on a pulse signal in relation to the sawtooth signal, and when receiving a synchronization pulse signal from the common line, synchronize the oscillation frequency of the sawtooth signal with the frequency of the synchronization pulse signal from the common line. So that a voltage of aligned frequency and phase is applied to one end of each discharge lamp.

Abstract: A DC/AC converter includes: a resonant circuit including a transformer having a primary winding and a secondary winding and at least one capacitor, in which the capacitor is connected to at least one of the primary winding and secondary winding of the transformer, and an output terminal to which the load is to be connected is provided on the secondary winding side; a switching circuit connected to both ends of a direct current power supply and having a bridge configuration composed of switching elements for flowing a current through the primary winding of the transformer and the capacitor in the resonant circuit; and a control circuit that turns on/off the switching elements by a pair of drive signals, and flows a current through the load bidirectionally, thereby performs a PWM control for the current flowing through the load, wherein the control circuit includes step drive circuits which turn on the switching elements in steps, and the step drive circuits are provided so as to individually correspond to the

Abstract: A method of processing an antifriction bearing unit for a wheel, the antifriction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: A discharge lamp lighter has an abnormality detecting circuit 7 for detecting an abnormality in an electrical load. The abnormality detecting circuit 7 includes a reference voltage part Ra1, Rb1, Ra2, Rb2 for generating a first reference voltage Vb1 and a second reference voltage Vb2, a detection voltage part Rc1, Rd1, Rc2, Rd2 for generating a first detection voltage Vc1 and a second detection voltage Vc2, a first determining part CP1 for determining the presence of abnormality in the electrical load when the second detection voltage Vc2 is outside a predetermined range with the first reference voltage Vb1 and a second determining part CP2 for determining the presence of abnormality in the electrical load when the first detection voltage Vc1 is outside the predetermined range with the second reference voltage Vb2.

Abstract: A method of processing an antifriction bearing unit for a wheel, the anti friction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: A method of processing an antifriction bearing unit for a wheel, the antifriction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: A method of processing an antifriction bearing unit for a wheel, the antifriction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: A method of processing an antifriction bearing unit for a wheel, the antifriction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: A method of processing an antifriction bearing unit for a wheel, the antifriction bearing unit including an outer race, an inner race, a plurality of rolling elements and a flange portion for directly or indirectly mounting a brake disk provided to one of the outer and inner races, the method includes: assembling the outer and inner races and the rolling element together; after assembling, placing the one of the outer and inner race in position incapably of circumferential rotation; grinding the flange portion by bring the flange portion into contact with a grindstone which is rotated while the other of the outer and inner race is left free.

Abstract: A master cylinder includes a cylinder housing having a rearwardly opening inner bore, a piston having a forwardly opening bore positioned in the inner bore of the cylinder housing, a spring disposed in the inner bore of the piston, a stopper supporting a front end of the spring, a retainer disposed in the inner bore of the piston and supporting a rear end of the spring, and a rod connecting the retainer and the stopper while allowing the spring to compress in the axial direction. A plurality of projection portions are formed on the outer circumferential portion of the retainer and the retainer is pressed into the inner bore of the piston via the projection portions.

Abstract: The invention provides a commutator motor capable of reducing vibration and noise generated in commutator motor and improving durability against breakage of armature. A commutator 3 having a conductive section 32 mounted on a rotary shaft 1 through an insulating section 31 is provided with a vibration-isolating member 33 made of rubber by adhesion or integral formation at the location between the conductive section 32 and the rotary shaft 1, for example, between the insulating section 31 and the rotary shaft 1 or between the conductive section 32 and the insulating section 31. In one aspect of the invention, another vibration-isolating member supports a brush holder 4 for holding a brush 41 coming in contact with the commutator 3.