A piezoelectric inverter is disclosed. In the piezoelectric inverter, an input voltage controller, having a switching transistor and a current circulatingelement, converts an input voltage into a rectangular pulse alternating-current voltage. A piezoelectric transformer driver, having an inductive element, outputs an alternating-current voltage having a substantially constant frequency lower than the frequency of the alternating-current voltage output from the input voltage controller. A load cu...

A three-phase bridge inverter for controlling a motor with a variable speed includes a drive circuit therefor and an overcurrent protection circuit on one integrated chip. The inverter IC can be operated by directly inputting a direct current obtained by rectifying commercial 100 V. Thus, the inverter chip reduces the size and the weight of a system, improves the usability, lowers the cost thereof and permits mass production fabrication. Also, the life of the IC is increased by detecting current...

Apparatus (10) for engaging, raising and rotating tanks/cylinders (48) which store or otherwise contain liquids or gases under pressure. The apparatus consists, basically, in a cradle (30) which is rotationally mounted on a single elevator housing (22). When the tank/cylinder is elevated, the cradle is either simultaneously or subsequently rotated in a plane orthogonal to the front-back axis of the apparatus base assembly (12). Torque and stresses placed on this apparatus are minimized and, in t...

An inverter device for variably controlling an operating frequency of an electric motor, which drives a compressor in a refrigerating cycle. the inverter includes a box-like resin case, having a metal film for shielding being applied or plated on a surface thereof and having a step portion on which a terminal block for the motor is arranged. A first substrate having mounted thereon power semiconductor devices constituting a converter and an inverter so as to be immersed in gel, and the first sub...

An integrated circuit inverter controller that includes at least one input pin that is configured to receive two or more input signals. The input pin may be multiplexed so that the appropriate input signal is directed to appropriate circuitry within the controller to support two or more functions of the controller. Alternatively, the input signals may be present in differing time periods so that a single pin can support two or more functions. Multifunctional or multitasked pins reduce the overal...

An object is to provide an inverter device capable of realizing exact protection of the winding of a motor. An inverter device for generating a pseudo alternating current by switching a direct current to drive a motor, comprises a controller that executes vector control on the basis of a secondary current applied to the motor. The controller calculates a current density from the secondary current to execute a predetermined protection operation on the basis of the calculated current density. The ...

A fault protection system for static inverters protects the SCRs of the static inverters from damage due to "shoot-through" and other faults without relying on fuses. The fault protection system also clears certain types of faults without shutting down the system so as to necessitate manual resetting. An impedance is inserted in series with an input portion of the power circuit. A voltage almost equal to line voltage can develop across the impedance when a heavy fault current occurs. Switchable ...

An inverter component layout and mounting bracket are disclosed which allow for electrical components, or the inverter as a whole to be replaced easily in the field. The disclosed mounting bracket and component layout also improve the heat rejection properties of the inverter.

An inverter device has a full-wave rectifier providing a pulsating DC voltage from an input AC voltage, a smoothing circuit. The smoothing circuit includes a choke coil, a smoothing capacitor and a switching element chopping the pulsating DC voltage through the choke coil into a smoothed DC voltage at the smoothing capacitor. An inverter is included to have the element common to the smoothing circuit and operating to switch the smoothed DC voltage to apply a resulting voltage to a load circuit i...

Variation in inductance and leakage inductance between the secondary windings is reduced thereby making lamp currents uniform and thus preventing the occurrence of uneven brightness. A two-output inverter transformer comprises a bobbin having a primary winding wound around the middle and secondary windings wound on both sides thereof and having a pole-like core inserted into its winding shaft. A rectangle frame-like core is placed to surround the primary and secondary windings such that the pole...