Abstract: A switching power supply circuit includes a transformer having primary, secondary and tertiary windings; a primary-side rectifying-and-smoothing circuit that converts AC power to DC power then smoothes it; a secondary-side rectifying-and-smoothing circuit that smoothes secondary-side power; a tertiary-side rectifying-and-smoothing circuit that smoothes power from the tertiary winding; a switching circuit that switches the primary winding; a pulse width control circuit that controls the switching of the switching circuit; an output-error detecting circuit that detects a deviation of a secondary-side DC output voltage from a reference voltage; and a ripple-voltage detecting-and-controlling circuit that detects a ripple-voltage of the secondary-side DC output voltage and stop-controls the output-error detecting circuit, wherein a stop-control signal from the ripple-voltage detecting-and-controlling circuit causes the output-error detecting circuit to stop outputting, then a drive signal to the switching circuit

Abstract: A USB portable device includes an activating USB peripheral, a storing USB peripheral, and a controlling USB peripheral. If the USB portable device is connected to a host apparatus, the activating USB peripheral is recognized as a readable device and a switching program in the recognized readable device is read in the host apparatus and is executed. Consequently, a switching instruction is received from the host apparatus, the readable device is unmounted, and the storing USB peripheral is recognized as the readable device.

Abstract: The present invention includes: a transformer having a primary winding, a secondary winding and a tertiary winding; a primary-side rectifying and smoothing circuit, which converts alternating-current power to direct-current power and smoothes the power; a secondary-side rectifying and smoothing circuit, which smoothes secondary-side power; a tertiary-side rectifying and smoothing circuit, which smoothes power of the tertiary winding; a switching circuit, which opens and closes the primary winding; a pulse width control circuit, which controls the pulse width of drive signals that control the opening and closing of the switching circuit; and a secondary-side electrolytic capacitor deterioration detecting circuit, which detects deterioration of the secondary-side electrolytic capacitor.

Abstract: The object is to provide a Web system A1 which enables a client B1 to eliminate the use of an application for instruction-receiving system even in an environment in which direct control from the Web system A1 to the instruction-receiving system C1 cannot be made and which makes an operation of transferring data from the instruction-receiving system C1 easy.

Abstract: A USB portable device includes an activating USB peripheral, a storing USB peripheral, and a controlling USB peripheral. If the USB portable device is connected to a host apparatus, the activating USB peripheral is recognized as a readable device and a switching program in the recognized readable device is read in the host apparatus and is executed. Consequently, a switching instruction is received from the host apparatus, the readable device is unmounted, and the storing USB peripheral is recognized as the readable device.

Abstract: In a PC card to be connected to a personal computer, two kinds of operational modes which are different in data bus width from each other can be changed over selectively. Either the CardBus mode with a data bus width of 32 bits or the 16-bit mode is selectable by a selector switch provided in a side face. The PC card 1 is operated in the 16-bit mode for use with a 16-bit-compatible personal computer, and operated in the 32-bit mode for use with a 32-bit-compatible personal computer. Thus, one PC card is useable with various personal computers.

Abstract: An interface cable allows the number of components and manufacturing costs to be reduced. The interface cable has a housing defining an inner volume which has an opening. A first connector is removably connectable to one of a computer and a portable terminal. The first connector protrudes through the opening in the housing. An interface circuit is coupled to the first connector in which the interface circuit is located within the housing. A cable is coupled to the interface circuit. A second connector is removably connectable to the other of the computer and the portable terminal.

Abstract: The PC card of the present invention preferably includes a logic circuit operating in either a 16-bit mode or a 32-bit mode, a ground line on the circuit, a connector for transferring a signal between the circuit and the external device, and a series of elastic metal members arranged on the top surface of the connector and connected to the ground line. When the connector of the PC card is inserted into the PC card slot, the elastic metal member is retained by a support frame arranged on the periphery of the PC card slot, and is deformed upward toward the top surface of the connector. When the PC card is fully inserted into the slot, the elastic metal member urges the support frame and both are firmly connected.

Abstract: The invention provides a data transfer method useful for data transfer with PC cards or other external equipment connected to a personal computer. First in a memory-to-memory data transfer mode, a part of data to be transferred is used as address data and the rest of the data to be transferred is stored at memory addresses specified by the address data. Next, in a block transfer mode, the data is transferred to a PC card or other external equipment. In this process, because transfer-source address data, i.e. part of the data to be transferred, is put on the address bus in the block transfer mode, the data is transferred with both address bus and data bus.