Abstract: An electronic device includes a display device and a base unit including a casing, a circuit board and a system connector. The system connector includes a system input terminal, a system positive terminal, a system negative terminal, system positive lines, system negative lines and a system detection line. The system input terminal is disposed corresponding to an opening of the casing, and the system positive terminal and the system negative terminal are electrically connected to the circuit board. The system positive lines are connected between the system input terminal and the system positive terminal, and the system negative lines and the system detection line are connected between the system input terminal and the system negative terminal. The system input terminal, the system positive terminal and the system negative terminal are non-overlapping in their orthographic projections on the casing.

Abstract: Techniques for providing a switchable inductor network having configurable inductance in response to a control signal. The switchable inductor network may adopt a fully symmetric architecture to reduce the effects of parasitic elements in differential mode operation. The switchable inductor network is particularly suitable for multi-mode communications circuitry applications, e.g., in the design of a voltage-controlled oscillator (VCO) or an amplifier or buffer in such circuitry.

Abstract: A digital photographing apparatus and a method of controlling the digital photographing apparatus are provided. The digital photographing apparatus stores an image signal in a memory at the same time with the calculation of a horizontal AF evaluation value with respect to the image signal, and calculates a vertical AF evaluation value by using the stored image signal. Accordingly, exact AF detection may be performed with respect to images of all patterns.

Abstract: A power converting device converts a DC voltage input from an external power source into an AC voltage output across an output capacitor of an output circuit, and includes a coupling circuit having series first and second windings. A rectifying diode has a grounded anode coupled to an anode of a clamp diode, and a cathode coupled to the second winding. A cathode of the clamp diode is coupled to a clamp switch and the first winding. A full-bridge circuit includes a first series connection of first and second switches, and a second series connection of third and fourth switches. The first and second series connections are coupled in parallel between the first winding and ground. The output capacitor is coupled between a first common node between the first and second switches, and a second common node between the third and fourth switches.

Abstract: A DC/DC power converter includes an electrically configurable transformer/inductor. The electrically configurable transformer/inductor receives a power plug. The power plug, depending on its configuration, configures the operation of the transformer/inductor and therefore the DC/DC power converter. The power plug may permit access to power received from the power converter. The power plug may also pass power to the power converter from a remote electrical source.

Abstract: There is provided a power supply for an electrical device operable in active mode and in standby mode. The power supply comprises a transformer having a primary winding on the primary side and a secondary winding on the secondary side. The primary winding is connectable to an AC voltage supply and is arranged to comprise N turns when the electrical device is in active mode and more than N turns when the electrical device is in standby mode. Circuitry on the secondary side is arranged to provide an output voltage for the electrical device during active mode.

Abstract: The present invention aims to obtain a stable output voltage without requiring an extra circuit by suppressing influence of noise of the primary winding and voltage induction by leakage inductance. In a transformer 3 used in a multi-output switching power supply, a secondary winding S1 for outputting a voltage to be fed back to the primary side out of the secondary windings S2 to Sn winded on a bobbin 3a is divided into a first layer S1a and a second layer S1b, a secondary winding S2 to Sn for outputting a voltage not fed back to the primary side is winded between the first layer S1a and the second layer S1b, and the first layer S1a and the second layer S1b is regular winded.

Abstract: Voltage stabiliser for electrical energy transportation and distribution applications, which consists of one or several electromagnetic devices of transformer type which, at discrete intervals, regulates the output voltage that reaches the consumer, taking the form of a transformer with a dual or quadruple primary winding and a simple secondary winding, the simple winding being able to be positioned before or after the parallel branch, the performance of the equipment remaining the same.

Abstract: A resonance tapped transformer circuit in which the effective turns ratio of the transformer is dependent on the frequency of the input signal. The transformer selectively connects one or more primary coils of the transformer in series and/or in parallel where the connection type is dependent on the line frequency. This changes the transformation ratio of the transformer.

Abstract: A power supply which automatically adapts to different input power sources. A double pole, double throw, latching relay switches the primaries of the rectifier transformer to a series or to a parallel configuration depending upon the output voltage of the rectifier, thus adapting the circuit to either a nominal 220 VAC source or a nominal 120 VAC source. The control circuit also derives power from the rectifier transformer and is designed to operate even under the worst possible undervoltage or overvoltage conditions. The additional choice of 24 VDC power is available by the use of a diode OR circuit. When a 24 VDC source is connected to the DC input, it is also connected to the rectifier output through a diode, so that power is furnished to the load by whichever source has the higher voltage. In this configuration, a battery pack can be connected to the DC input to supply automatic backup power.

Abstract: An automatic input switching circuit for a power supply includes a transformer with two primary windings, normally connected in series and connectible in parallel by relay contacts for operation in a doubler mode. The secondary winding supplies a rectifier for developing a DC output voltage and a voltage doubler for developing a higher voltage than the output voltage. The voltage doubler charges a capacitor that stores energy for operating the relay when a transistor switch is closed. The transistor switch is normally held in a nonconductive state by an inhibit transistor driven from a comparator that switches states when the voltage across the capacitor reached a predetermined level. A voltage sensing arrangement compares the rectifier output voltage with a reference voltage and when it reaches a certain level, another comparator switches states to activate a disable transistor.

Abstract: A split structure type transformer has a core upper and lower split-up secondary windings and a primary winding which are wound about the core, a single tap winding having a plurality of tap winding parts and a plurality of tap terminals, and a single tap selector. The secondary windings are respectively connectable to independent loads, with only one end of the tap winding being connected to the primary winding, and the tap terminals are respectively connected to terminals of the tap selector. A pair of tap winding parts, connected to the same terminal of the tap selector, are arranged adjacently along the axial direction of winding. Each of the tap winding part pairs may be replaced by a single tap winding part which is formed by winding a single strand having a cross-sectional area which is twice a cross-sectional area of a strand used for winding each tap winding part pair.

Abstract: An A.C. power entry module for supplying A.C. power to equipment which provides A.C. fusing, power on-off switching, RFI filtering and selection of voltage. The module can be utilized for both U.S. and European style fusing and a number of different voltage options are available which can be selected by merely changing the position of a circuit board. The contacts for engaging the fuses are mounted such that an operator cannot come in contact with them and the European or U.S. fuses can be easily selected by inverting a fuse holder board.

Abstract: A multi-voltage transformer input circuit, which may have multi-phase input, and where the input or each phase of the input has a primary reactor voltage control, is provided by the present invention. The primary winding of the transformer, or each phase of the primary winding has at least two sections which are bifilar wound on a single core, each section having its own polarity. Each primary winding section is connected with one of a pair of like synchronous operating current control devices, which may be saturable core reactors, magnetic amplifier, or phase-angle fired silicon controlled rectifiers. Each synchronous operating device is in series with its respective primary winding section, the first in opposite polarity to the first primary winding section, the second with the same polarity as the second primary winding section.