Abstract: A protection device includes a first inductive element connecting first and second terminals and a second inductive element connecting third and fourth terminals. A first component includes a first avalanche diode connected in parallel with a first diode string, anodes of the first avalanche diode and a last diode in the string being connected to ground, cathodes of the first avalanche diode and a first diode in the string being connected, and a tap of the first diode string being connected to the first terminal. A second protection component includes a second avalanche diode connected in parallel with a second diode string, anodes of the second avalanche diode and a last diode in the string being connected to ground, cathodes of the second avalanche diode and a first diode in the string being connected, and a tap of the second diode string being connected to the third terminal.

Abstract: A load control device includes a switching unit which is connected to a power source and a load in series and has a switch device having a transistor structure, a control unit configured to control start-up and stop of the load, and a gate driving unit, which is electrically insulated from the control unit and outputs a gate driving signal to the gate electrode of the switch device. The control unit controls the gate driving unit to supply a higher driving power to the gate electrode of the switch device for a predetermined period of time starting at the start-up of the load than that in a steady state.

Abstract: A device for improving efficiency of an induction motor soft-starts the motor by applying a power to the motor that is substantially less than the rated power of the motor then gradually increasing the power while monitoring changes in current drawn by the motor, thereby detecting when maximum efficiency is found. Once maximum efficiency is found, the nominal motor current is found and operating ranges are set. Now, the phase angle between the voltage and the current to the motor is measured and power to the motor is increasing when the phase angle is less than a minimum phase angle (determined during soft-start) and power to the motor is decreased when the phase angle is greater than or equal to the minimum phase angle as long as the voltage does not fall below a minimum voltage determined during soft-start.

Abstract: The invention relates to a method for operating an electric motor (2) having a phase angle control with the following steps: Applying an AC voltage to a series connection of the electric motor (2) and a switching element (4), particularly a triac, wherein the switching element (4) connects through by applying an ignition signal and suppresses the flow of a current if the amount of current falls below a holding current; determining the time of a zero crossing of a virtual motor current that would flow if the switching element (4) were connected through; and turning on the switching element (4) at an activation time that is dependant on the time of the zero crossing of the virtual motor current.

Abstract: A winding switching apparatus includes a winding switching device and a drive circuit. The winding switching device is configured to switch a plurality of windings of an AC motor. The drive circuit is configured to control the winding switching device. The winding switching device includes a winding switch, a diode bridge, and a capacitor. The diode bridge includes a positive-side DC output terminal, a negative-side DC output terminal, and AC input terminals. The AC input terminals corresponds to respective phases of the AC motor. The positive-side and negative-side DC output terminals are respectively connected to positive-side and negative-side DC buses provided in an inverter. The AC input terminals are respectively connected to winding-switching terminals corresponding to the respective phases of the AC motor. The AC input terminals are respectively connected to phase terminals provided in the winding switch.

Abstract: Method for operating a converter circuit with voltage boosting with N half-bridges, which in each case can be connected by their center connection to a phase of an N-phase generator and at an end side are connected in parallel with a series circuit formed by two capacitances, wherein each half-bridge contains a Top switch and a Bot switch, in which, in a PWM method with a fixed period duration at the beginning of the period duration, all the TOP switches are simultaneously switched on for the duration of a TOP switched-on interval. After half the period duration all the BOT switches are simultaneously switched on for the duration of a BOT switched-on interval wherein the TOP switched-on interval, and the BOT switched-on interval amount at most to half the duration of the period.

Abstract: A voltage control circuit is disclosed. A power factor corrector may utilize the control circuit to provide power factor correction for an AC induction motor. An AC induction motor system may combine the power factor correct with an AC induction motor.

Abstract: A circuit for generating a D.C. signal for controlling an A.C. switch referenced to a first potential, from a high-frequency signal referenced to a second potential, including: a first capacitive element connecting a first input terminal, intended to receive the high-frequency signal, to the cathode of a rectifying element having its anode connected to a first output terminal intended to be connected to a control terminal of the switch; and a second capacitive element connecting a second input terminal, intended to be connected to the second reference potential, to a second output terminal intended to be connected to the first reference potential, a second rectifying element connecting the cathode of the first rectifying element to the second output terminal.

Abstract: A method for controlling fault interruption in a high voltage electrical energy transmission system semiconductor high voltage electrical energy transmission switching system which includes a multiple stack of power semiconductor SCR thyristor circuit sections arranged for single phase or three-phase operation with each section of the stack comprising; a pair of input and output terminals, a plurality of switching thyristors connected in series between the input and output terminals, an auxiliary power transformer having at least three windings with first and second windings interconnecting the input and output terminals of one section to the respective output and input terminals in each adjacent section of the stack such that the voltage difference between the first and second transformer windings is limited to the maximum voltage across the section.

Abstract: An analog voltage pulse generator, including a first break-over component of Shockley diode type to activate a rising edge of a pulse on an output terminal and a second component of thyristor type to block the first component and deactivate the pulse.

Abstract: A method for controlling fault interruption in a high voltage electrical energy transmission system semiconductor high voltage electrical energy transmission switching system which includes a multiple stack of power semiconductor SCR thyristor circuit sections arranged for single phase or three-phase operation with each section of the stack comprising; a pair of input and output terminals, a plurality of switching thyristors connected in series between the input and output terminals, an auxiliary power transformer having at least three windings with first and second windings interconnecting the input and output terminals of one section to the respective output and input terminals in each adjacent section of the stack such that the voltage difference between the first and second transformer windings is limited to the maximum voltage across the section.

Abstract: A circuit configuration for supplying voltage to an integrated circuit via a pad that is connected to the input of a Schmitt trigger on the integrated circuit. The pad is also provided for configuring the integrated circuit. The integrated circuit has a multiplicity of voltage supply lines for voltage supply purposes. According to the invention, the pad is connected to a respective voltage supply line via a respective switch, and the switches are switched on or off by a control circuit that is controlled by at least one on-chip control signal.

Abstract: An improved circuit for activating a high side mosfet drive during a predetermined phase of the A/C cycle. The circuit includes an electronic switch which is connected to an A/C line. The switch operates between an open and closed position. Also included is a mosfet drive connected to the A/C line. The mosfet drive is activated when the switch is in an open position and is deactivated when the switch is in a closed position. The circuit may also include a capacitor connected to the A/C line. The capacitor is charged during the positive phase of the A/C cycle and powers the mosfet drive during the negative portion of the A/C cycle when the switch is in an open position.

Abstract: A key switch control device includes a gate controller and a load connected in series to AC power supply, a control circuit connected to the key switch to receive from it a pulse signal for controlling the gate controller and the load, enabling AC power supply to be connected to the load when the key switch is clicked once, or disconnected from the load when the key switch is clicked at least twice. The control circuit includes an oscillator, a time pulse counter, a periodic comparator, a power modulation recognizer, and an output drive.

Abstract: A power controller device which uses a voltage-to-frequency converter in conjunction with a zero crossing detector to linearly and proportionally control AC power being supplied to a load. The output of the voltage-to frequency converter controls the "reset" input of a R-S flip flop, while an "0" crossing detector controls the "set" input. The output of the flip flop triggers a monostable multivibrator controlling the SCR or TRIAC firing circuit connected to the load. Logic gates prevent the direct triggering of the multivibrator in the rare instance where the "reset" and "set" inputs of the flip flop are in coincidence. The control circuit can be supplemented with a control loop, providing compensation for line voltage variations.

Abstract: An AC two-wire switch, comprising a pair of external terminals, a main circuit bidirectional switching module being connected between a pair of the external terminals, a control circuit for controlling action of the main circuit bidirectional switching module, and a self-generating power supply for providing the working power supply to the control circuit. The self-generating power supply includes a rectifying circuit, a voltage stabilizing circuit, a main circuit off-state feed circuit and at least one mutual inductor. According to this invention, the provided AC two-wire switch may greatly reduce the additional on-state voltage-drop and the additional off-state current, and furnish the best short-circuit protection and quick-acting overload protection.

Abstract: An SCR control circuit which drives the SCR between conduction and non-conduction states in accordance with values sensed by a polarity sensing circuit. The control circuit generating a signal for the gate which is of a constant value, at different temperatures.

Abstract: A method and a device for regenerating clock rate information in which data is intermediately stored in a memory to which the data is read at a first rate and out of which the data is read at a second rate. The difference between two levels of the amount of data stored in the memory is determined, after which the difference is compared with a reference value. The result from the comparison affects the second rate so that, at subsequent measurements of the difference, the difference between it and the reference value shall decrease.

Abstract: A solid-state switch has a plurality of gate turn-off thyristors connected in the rungs of a ladder circuit and a plurality of diodes connected in the side rails of the ladder circuit. The anode of the first gate turn-off thyristor is connected to the cathodes of the first and second diodes, the cathode of the first gate turn-off thyristor is connected to the anodes of the third and fourth diodes. The cathode of the second gate turn-off thyristor is connected to the anode of the second diode and the anode of the fifth diode, the anode of the second gate turn-off thyristor is connected to the cathode of the fourth diode and the cathode of the sixth diode. The anode of the first diode and the cathode of the third diode are connected together at a common point, which is selected to be one terminal of the switch.

Abstract: A method for regulating the power in a load connected to the mains through a controlled switch and a device for implementing the method. The method includes the following steps: detecting a mains synchronization pulse, which determines the start of a cycle, within a fixed time interval of the preceding cycle; as soon as the pulse has been detected, waiting for the end of the fixed interval, then counting down a first time interval that substantially corresponds to a selected time interval; at the end of the first time interval, triggering the switch on and counting down a second time interval that ends before the normal arrival of the next synchronization pulse; and at the end of the second time interval, counting down the fixed time interval within which the next synchronization pulse must be detected.