Abstract: A level shifting circuit, satisfying a requirement of a high tolerated dV/dt level, and a highly reliable inverter circuit, wherein a set pulse signal and a reset pulse signal, both of which are level-shifted to a potential side taking as reference a reference potential of a gate control terminal of a switching terminal, are obtained differentially and integrated, and, in case these pulse signals equal or exceed stipulated integrated values, are transmitted as regular control signals controlling the on/off state.

Abstract: A switchgear cell is disclosed for switching n switching voltage levels, where n is an odd number of 5 or greater (i.e., n=5, 7, 9, . . . ,) is specified. The switchgear cell includes a first and a second branch circuit, wherein each branch circuit includes n-1 series-connected power semiconductor switches and p=n-2 power semiconductor switch junction points among the series-connected power semiconductor switches of each branch circuit. An intermediate circuit includes a first and a second capacitance, the first capacitance being connected to a power semiconductor switch junction point having an odd counting number x of the first branch circuit when the power semiconductor switch junction points can be counted starting with an odd counting number x from the first end to the second end of a respective branch circuit. The second capacitance is connected to a power semiconductor switch junction point of the second branch circuit.

Abstract: The present invention relates to a circuit arrangement, having a power circuit and a control circuit, in which the power circuit with the control circuit is activatable and deactivatable, and the power circuit is activatable only when the power circuit is switched on and is deactivatable only as long as the power circuit is switched on. The present invention further relates to a switch device, which includes an actuator as well as a first switch for switching a power circuit and a second switch for switch a control circuit of a circuit arrangement, in which the first switch and the second switch are switchable by actuation of the actuator, and the second switch is switchable only when the first switch is switched.

Abstract: The power conversion system allows for multiple segregated and ground independent power sources to provide redundant power to modules within an electronics equipment cabinet with increased reliability and reduced sensitivity to common fault propagation. The power conversion system provides power conditioning modules having independent supply rails that supply power to each module within an electronics equipment cabinet. FET and diode solid-state control and driver logic enable each individual supply rail. Efficient power distribution is facilitated by primary and hot-backup operation of one or more power conditioning modules. Power conversion is facilitated by one or more input supply power feeds and one or more converter stages.

Abstract: A test apparatus for a device under test (DUT) that includes a signal output device that outputs a signal according to a test signal and a detecting section that detects a signal output from the DUT that outputs a detection result. The signal output device includes an output port, a high-voltage side switching circuit between a first terminal and a second terminal, a low-voltage side switching circuit between a first terminal and a second terminal, and a control section that outputs the first and second control signals. Each of the high-voltage and the low-voltage side switching circuits include a plurality of switching devices serially connected between the first and second terminals. The plurality of switching devices are opened substantially in synchronization with each other, such that a voltage inputted to the first terminal is outputted from the second terminal by short-circuiting between the first and second terminals.

Abstract: An intermediate circuit for controlling the connection of a fuel cell stack to a load bus includes three switching elements arranged in a pi configuration. At least one such switching element is provided for short circuiting either or both of the fuel cell stack and the load bus, while a further switching element controllably interrupts the line connection between the fuel cell stack and the load bus. The respective switches are driven according to a control method that accommodates start-up operation, switch-off operation, emergency shut down, and a self diagnostic mode.

Abstract: A power control assembly for use in an integrated power control system has a base with a housing that defines a cavity adapted for receiving a power switch. The control assembly includes a control module configured for generating control signals for controlling the power switch for selectively providing power to a load. A control housing houses the control module and is adapted to be releasably coupled to the base housing and is configured for electrically coupling to control couplers on the base housing for providing the generated control signals to the power switch within the housing cavity upon coupling the control housing to the base housing.

Abstract: A power management system is described. The power management system includes an input power selecting unit, a charging control unit and a power switching control unit. The input power selecting unit receives a plurality of input power sources for selecting one of the input power sources to be inputted to the electronic apparatus. The charging control unit includes a charging controller and a battery. The charging controller receives a charge-enabling signal. The battery is charged by a second voltage and selectively supplies a battery power. The power switching control unit outputs a driving voltage to drive the electrical apparatus based on an adaptor-enabling signal and a power-detecting signal when the power switching control unit switches the input power sources and the battery power to select one of the input power sources and the battery power.

Abstract: A redundant control circuit comprises a pair of heater circuits for heating a hot melt adhesive hose assembly to a predetermined temperature level, and a pair of temperature sensors which are used to sense the temperature of the hot melt adhesive hose assembly and to control energization of the heater circuits in order to maintain the desired temperature level. A first one of the heater circuits would initially be electrically connected to the hot melt adhesive hose assembly electrical circuitry, and in a similar manner, a first one of the temperature sensors would likewise be electrically connected to the hot melt adhesive hose assembly electrical circuitry.

Abstract: A apparatus and method of operating a power converter circuit is provided. The method selectively couples control signals to at least one output driver stage of a plurality of output driver stages of the power converter circuit to obtain a desired output at a select output port of the plurality of output ports. Wherein each output driver stage has a defined current drive capacity that is output to the select output port in response to the control signals.

Abstract: The invention relates to a hybrid electrical switching device, comprising an electromechanical relay including a mechanical switching element to be operated by an electrical coil, and a main semiconductor switching element including a control input and a current conduction path which is connected in parallel with the mechanical switching element for energizing an electric load. The main semiconductor switching element is of the type that ceases to conduct when a current through the current conduction path thereof drops below a threshold value. The circuit furthermore comprises an auxiliary semiconductor switching element including a control input and a current conduction path which is connected for controlling the main semiconductor switching element.

Abstract: A safety controller provides a safety output to a target controlled system such as a magnet contactor based on an input from an input device such as a safety door switch to thereby control operation of machine equipment. Safety output parts serve to transmit a solid-state output as the safety output and a connection output part transmits a connection output to another safety controller. A control part having two CPUs controls the safety output and the connection output according to a program based on the input from the input device. Two or more of such safety controllers are connected through their connecting output parts and the connecting input parts to together form a safety system.

Abstract: An exemplary adaptor circuit of a power supply includes a power connector, a first electric switch, a second electric switch, and an output terminal. The power connector includes a power good pin and a power pin. The first electric switch has a first terminal connected to the power good pin of the power connector, a second terminal connected to the power pin of the power connector, and a grounded third terminal. The second electric switch has a first terminal connected to the second terminal of the first electric switch, a second terminal connected to a first voltage terminal via a first transmission line or a second voltage terminal via a second transmission line by selectively mounting a connection component to close an open segment of the corresponding transmission line, and a grounded third terminal. The output terminal outputs a driving voltage signal to chipsets on a motherboard.

Abstract: A transformer controller for a drive isolation transformer is provided. The transformer may include multiple sets of primary windings as an input, and the transformer controller may include multiple branches coupled between a power source and the transformer. Each branch may be coupled to its own primary winding on the transformer, and may include one or more components, such as an isolation switch, a fuse, contactor, or circuit breaker. One or more of the branches may include a pre-charge reactor to limit inrush or capacitor charging current occurring during startup, and may include a pre-charge contactor to remove the pre-charge reactor from the circuit when the startup process has reached a certain level (e.g., the charging or inrush current has dissipated, or a DC bus reaches a charged state).

Abstract: A downhole measurement assembly comprising a metal casing housing a plurality of tool sections, one of which includes a detector sensitive to a magnetic field, and a DC power supply for said tool sections, the power supply and the tool sections being electrically connected to the casing, characterised in that the power supply is connected to at least one tool section via a switching circuit and a conductor arrangement, the switching circuit comprising a capacitor, a plurality of switches and control means operative alternately to charge the capacitor from the DC supply and discharge the capacitor through said at least one tool section using the conductor arrangement so as to inhibit the generation of an electromagnetic field in the conductor arrangement between the capacitor and the said at least one tool.

Abstract: A switch drive circuit utilizes charge transfer within and/or between boost circuit and/or snubber circuits for boosted switch drives. A boost circuit may include a divider to limit a boosted signal for driving a switch. A snubber circuit may transfer charge to a boost circuit.

Abstract: A plurality of electronically controlled parallel electro-mechanical switches are each configured to deliver power from a power source to an electric motor of an automotive vehicle. The electric motor has an expected number of activation cycles for the life of the automotive vehicle. Each of the electro-mechanical switches has a specified number of activation cycles that defines its useable life. The specified number of action cycles for each of the electro-mechanical switches is less than the expected number of activation cycles of the electric motor.

Abstract: This invention discloses a power switch that includes a fast-switch semiconductor power device and a slow-switch semiconductor power device controllable to turn on and off a current transmitting therethrough. The slow-switch semiconductor power device further includes a ballasting resistor for increasing a device robustness of the slow switch semiconductor power device. In an exemplary embodiment, the fast-switch semiconductor power device includes a fast switch metal oxide semiconductor field effect transistor (MOSFET) and the slow-switch semiconductor power device includes a slow switch MOSFET wherein the slow switch MOSFET further includes a source ballasting resistor.

Abstract: A modulator switch composed of stacks of high voltage switching devices connected in series are fired substantially simultaneously to provide pulsed, high voltage switching capable of providing megajoules of energy. The switching devices are fired by a trigger box that is clocked to provide a pulsed signal to each of the switching devices. The trigger box generally consists of a triggering or driver circuit and a pulse generating circuit. These circuits are electrically isolated from one another using suitable shielding and spacing. The pulsed output of the trigger box is fed to the switching devices across low inductance twisted cabling that is passed through toroidal transformers connected to the inputs of the switching devices. Varistors are clamped across each stack of switching devices to provide over-voltage protection for the switching devices.

Abstract: An apparatus for supplying DC power to a field device, such as a motor, starter or actuator, includes a multi-pole main switch and a DC voltage supply device, both of which are connected at their respective AC-voltage input sides to a line voltage via a line protection. The DC-voltage side of the DC voltage supply device is connected via a two-pole switch to respective lines of the same power cable that connects output terminals of the apparatus to the field device. The multi-pole main switch and the two-pole switch are ganged. This approach eliminates a separate DC power cable between the apparatus and the field device.

Abstract: A power over Ethernet (PoE) power sourcing equipment (PSE) architecture for variable maximum power delivery. PoE PSE subsystems rely on some control to “turn on” a power field effect transistor (FET), which allows current to be transmitted to a powered device (PD). A hybrid approach is provided where an internal FET can be augmented with an external FET to provide an architecture that can be flexibly applied to applications with various space, cost and cooling limitations. The maximum delivered power can also be boosted with the addition of an external FET to the internal FET.

Abstract: A modular switchgear includes a connecting device having a plurality of positions; a plurality of output modules coupled to the connecting device, each of the output modules having a switching device, the switching device configured to set a number representing a position on the connecting device; and a plurality of input modules coupled to the connecting device, each input module having a position on the connecting device; wherein each input module is associated with the output module having its position set on a specific output module and ending with the next higher designated position set on a different output module minus 1.

Abstract: A drive circuit for a semiconductor switching element includes a transformer, first and second driver circuits, and a rectifier element. The drive circuit produces a drive signal based on an input signal. The transformer has a primary winding and a secondary winding, and is integrated in a first semiconductor body. The first driver circuit is coupled to receive the input signal, and has at least one output which is coupled to the primary winding of the transformer. The first driver circuit also includes a first supply input connected to receive a first supply potential. The second driver circuit is operable to provide the drive signal and has at least one input coupled to the secondary winding. The second driver circuit has a second supply input. The rectifier element is connected between the first and the second supply input, and is integrated in the first semiconductor body.

Abstract: An exemplary light emitting diode flexible printed circuit (100) includes four light emitting diodes (110); three switching units (117) interconnecting the four light emitting diodes; a first lead (113) and four second leads (115). The first lead connects with the switching unit, all but one of the four second leads connect with the switching unit, and one of the four second leads connects with one of the light emitting diodes. The switching units are configured for switching the four light emitting diodes between a series connection state and a parallel connection state.

Abstract: A constant voltage regulator and registers R1 and R2 generate a reference voltage with at least one of voltages supplied from a battery and an AC adaptor. The reference voltage is supplied to a first input terminal of a comparator. An input voltage supplied from the AC adaptor and divided by registers R3 and R4 is supplied to a second input terminal of the comparator. The comparator compares the reference voltage with the input voltage. When the reference voltage is lower than the input voltage, an FET switch SW1 is turned on and power is supplied from the AC adaptor side. When the reference voltage is higher than the input voltage, an FET switch SW2 is turned on and power is supplied from the battery side.

Abstract: A photovoltaic system, method and apparatus are disclosed. In an exemplary embodiment, the system includes a first and second inputs adapted to couple to a first and second rails of a photovoltaic array; an inverter configured to convert DC power from the photovoltaic array to AC power; and an interface portion coupled to the first and second inputs and the inverter, the interface portion configured to isolate at least one of the first and second inputs from the inverter and to modulate an application of a voltage from the photovoltaic array to the inverter so as to increase a load on the photovoltaic array and to reduce the voltage applied from the photovoltaic array to the inverter.

Abstract: Accordingly, an energy dumping system for an electric component system is provided. The energy dumping system includes a power consuming element that consumes excess energy of the electric component system and dissipates the excess energy as heat. A solid state switch selectively permits energy of the electric component system to flow across the power consuming element. A control module is operable to monitor a voltage of the electric component system and apply a pulse width modulated (PWM) signal to the solid state switch to selectively control energy of the electric component system to flow across the power consuming element.

Abstract: A current control device is disclosed. The current control device includes control circuitry integrally arranged with a current path and at least one micro electromechanical system (MEMS) switch pair disposed in the current path. The current control device further includes a hybrid arcless limiting technology (HALT) circuit connected in parallel with the at least one MEMS switch pair facilitating the opening of the at least one MEMS switch pair.

Abstract: A first bypass circuit has first and second nodes. The first load circuit is connected between the first node and a signal input terminal of the second drive circuit. The second load circuit has substantially the same impedance as the first load circuit, and is connected between the second node and the reference potential terminal of the second drive circuit. The first drive circuit has the same reference potential as the input buffer. The second bypass circuit passes a signal of a predetermined frequency or higher between a current path formed between the first load circuit and the signal input terminal of the second drive circuit and a current path formed between the second load circuit and the reference potential terminal of the second drive circuit. The first bypass circuit passes a signal of a predetermined frequency or higher between the first and second nodes.

Abstract: Embodiments of a power distribution apparatus that is adaptable to be readily mounted within a variety of differing types of electronic equipment racks are herein described. One such embodiment provides power distribution apparatus having an upper mounting adapter. The upper mounting adapter may be attachable to a housing of the power distribution apparatus or may be integrally formed therein. Another embodiment provides power distribution apparatus having a lower mounting adapter. The lower mounting adapter may be attachable to the housing of the power distribution apparatus or may be integrally formed in the housing. A further embodiment provides power distribution apparatus having at least one mounting peg mounting in mating holes formed in a rack. The mounting pegs may be attachable to a housing of the power distribution apparatus or may be integrally formed therein.

Abstract: When a driving signal changes from L level to H level, a switching circuit is turned on. Then, a gate current flows from a booster circuit to MOSFET through the switching circuit and a resistor. A gate monitor circuit outputs a drive abnormality detection signal of L level when the gate current exceeds a predetermined threshold value. A switching circuit and MOSFET are also similarly driven by a driving signal, and a gate monitor circuit also similarly outputs a drive abnormality detection signal of the L level. When the drive abnormality detection signal changes to the L level, the driving signals are brought to the L level, and the MOSFETs are separated from the booster circuit.

Abstract: A current control device is disclosed. The current control device includes control circuitry integrally arranged with a current path and at least one micro electromechanical system (MEMS) switch pair disposed in the current path. The current control device further includes a hybrid arcless limiting technology (HALT) circuit connected in parallel with the at least one MEMS switch pair facilitating the opening of the at least one MEMS switch pair.

Abstract: A circuit for servicing a load connectable with a power supply is disclosed. The circuit includes a plurality of three-terminal switches and one control supply. The three-terminal switches define a series conduction path connectable between the power supply and the load. Each of the plurality of three terminal switches includes a source terminal, a drain terminal, and a gate terminal. The control supply is productive of a control voltage and in power connection between the gate terminal and source terminal of each of the plurality of three-terminal switches. Each of the plurality of three-terminal switches is responsive to the control voltage at its respective gate terminal to close a connection between the respective source terminal and respective drain terminal of each of the plurality of three-terminal switches.

Abstract: A circuit for driving a switching stage including control and sync switches series connected at a switching node, at least one of the control and sync switches being a normal ON depletion mode device, the circuit comprising a gate driver including first and second switching stages for generating gate drive signals for the sync and control switches, respectively, the first switching stage having a first driver output node and the second switching stage having a second driver output node, a signal from the first node driving the sync switch and a signal from the second node driving the control switch and a circuit connected to the first and second switching stages, the circuit including a first circuit providing a first voltage source, the first circuit being coupled to the first switching stage and to the sync switch, a first bias voltage from the first voltage source being switched by the first switching stage, the first switching stage having a first state wherein the sync switch is on, and a second state wh

Abstract: A modular switchgear control to control the operation of one or more vacuum interrupter switches includes a cabinet that may contain one or more line powered or low energy control panels. Each low energy and line powered control panel allows multiple interrupter switches to be coupled in parallel so as to increase its current rating. Coupled to each line or low energy control panel is an input power panel, that receives single-phase power from a suitable power source. A controller panel and a timing panel may also be carried in the cabinet so as to coordinate the opening and closing of the interrupter switches in either an asynchronous or synchronous manner. A noise detection panel may also be provided to determine when the interrupter switches are beginning to fail.

Abstract: A two-output dual polarity inductive boost converter includes an inductor, a first output node, a second output node, and a switching network, the switching network configured to provide the following modes of circuit operation: 1) a first mode where the positive electrode of the inductor is connected to an input voltage and the negative electrode of the inductor is connected to ground; 2) a second mode where the positive electrode of the inductor is connected to the first output node and the negative electrode of the inductor is connected to the second output node; and 3) a third mode where the positive electrode of the inductor is connected to the input voltage and the negative electrode of the inductor is connected to the second output node.

Abstract: To provide a method of operating a shielded connection where signals are exchanged between two nodes (1) on a communications network over a connecting line (5a, 5b) and the connecting line (5a, 5b) has a shield (3), by which method can be established that the shield (3) is in a proper state, it is proposed that when a signal is transmitted from a first node (1) over the connecting line (5) to a neighboring node a current (Ishield) is drawn into the shield (3) and when operation is taking place in other ways the shield (3) is set to a bias voltage (UBias). A suitably arranged communications network is also specified.

Abstract: An automatic charging and power management device includes a charging control unit and at least one power switching control unit. The charging control unit is connected to a rechargeable battery and an input power source to control the charging operation to the rechargeable battery. The input power source can be a USB-interfaced power source or a rectification transformer based power source. The power switching control unit connects the input power source and is provided with at least one power input terminal, a charging control terminal, a charging voltage terminal, a system actuation switch, a system actuation terminal, a power type terminal, and at least one power output terminal. The charging control terminal and the charging voltage terminal are connected to the charging control unit. The system actuation terminal is actuated on/off by the system actuation switch to generate a system actuation signal. The power type terminal generates an identification signal based on the type of the input power source.

Abstract: An integrated circuit device provides a choice of external pins (connections) that may be user selectable for coupling an external filter/stabilization capacitor to an internal voltage regulator. However, connecting the output of a internal voltage regulator to an uncharged external filter/stabilization capacitor (or to a capacitor charged to a different voltage level than the internal regulation voltage) through a low impedance path can cause the regulator output voltage to sag/spike if the internal voltage regulator tries to charge/discharge the capacitor up/down to equilibrium with the regulator output voltage. To minimize this potential sag/spike, the voltage on the external filter/stabilization capacitor may be adjusted in a controlled manner to substantially the same voltage as the voltage on the output of the internal voltage regulator, and then the internal voltage regulator is operationally coupled through a low impedance to the external regulator filter/stabilization capacitor.

Abstract: A switching mode power supply and a switch thereof are provided. The switch includes a plurality of first transistors, and a second transistor that is turned on/off by a control signal that is equal to that of the plurality of first transistors and in which a second current corresponding to a first current flowing to the plurality of first transistors flows, wherein a ratio of the first current to the second current sequentially changes from a time point at which the second transistor is turned on. Therefore, a switching mode power supply and a switch thereof that can always uniformly sustain a maximum limit current flowing to the switch regardless of a level of an input voltage without including a special additional circuit can be provided.

Abstract: An electric switching device arrangement has a switching section consisting of at least one first and one second switching point which are electrically connected in series by a conductor section used therefor. In order to compensate external vibrations effecting the electric switching device arrangement provided with the switching section, the conductor section consists of at least two bend slackening conductor elements which are connected to each other by way of a rigid connecting element. The elongated length of the conductor elements is greater than a distance along a straight line between contact points of the switching points.

Abstract: There is provided a switching circuit that opens or short-circuits between a first terminal and a second terminal in accordance with a control signal. The switching circuit includes a plurality of switching devices that is serially connected between the first terminal and the second terminal and each of which is opened or short-circuited in accordance with a provided control voltage, and a plurality of control circuits that is provided one-to-one corresponding to the plurality of switching devices, each of which provides a control voltage according to the control signal to the corresponding switching device, and that opens and short-circuits the plurality of switching devices in synchronization with each other.

Abstract: A switchgear cell having a group of connection is disclosed, with the group of connection having a first and a second controllable bidirectional power semiconductor switch and a capacitor.

Abstract: The invention provides an apparatus for shunting leakage current of a solid state switching device (SSSD) (10). The apparatus selectively provides a shunt pathway to divert current away from the output load based on the switching state of the SSSD. The apparatus may include a shunt impedance component (14) connected to the SSSD, and a switching element (16) for selectively connecting the other end of the shunt impedance component to ground based on the switching state of the SSSD. Accordingly, when the SSSD is turned off, the switching element is switched to a state that connects the shunt impedance component to ground, thereby shunting leakage current.

Abstract: In some embodiments, a power extractor's control loop detects changes in power and controls the duty cycle of the switching circuitry in response to the detected changes in power, thereby controlling the power transfer. The control loop may include a signal generator to control the duty cycle, and the frequency of the generated signal may be changed to optimize the energy transfer efficiency. The switching circuitry may control the rate at which circuits store and release the energy in response to the control signal and thereby seek to obtain a rate of storage and release that results in no detected changes in power. Other embodiments are described and claimed.

Abstract: Provided is a digital circuit (30) that comprises: a switching circuit (31) having first transistors (32, 33) supplied with power supply potentials (VDD, VSS): correcting circuits (34, 36) connected between an input terminal (IN) inputted with an input signal and control terminals (gates) of the first transistors: capacitors (C2, C3) connected between the control terminals and the input terminal: diode-connected second transistors (35, 37) that are provided between nodes (N5, N6) between the capacitors and the control terminals and the power supply potentials and have the substantially same threshold voltage as the first transistors; and switches (SW2, SW3) connected in series with the second transistors.

Abstract: A power switching circuit is disclosed. The power switching circuit includes an output switch coupled to a power supply, a control circuit controlling the first switch to output the power supply according to a voltage of a node, and a user switch for receiving a switch signal. Two clock circuits control the voltage of the node according to the period of the switch signal.

Abstract: An electrical switching topology for a hybrid switch provides extremely low losses in both cryogenic and non-cryogenic electronic systems. In this switch having switch modules connected in parallel, switching losses in a first module are separated from conduction losses in the parallel-connected second module. The conduction losses are then further reduced by cryogenically cooling the second module. Since the switching losses of the first module can be absorbed outside a cryogenic container, the switching losses do not add to the cryogenic heat load. In other applications, the switching module operates at lower temperatures to provide higher switching speeds and reduces switching heat generation.

Abstract: An apparatus for supplying DC power to a field device, such as a motor, starter or actuator, includes a multi-pole main switch and a DC voltage supply device, both of which are connected at their respective AC-voltage input sides to a line voltage via a line protection. The DC-voltage side of the DC voltage supply device is connected via a two-pole switch to respective lines of the same power cable that connects output terminals of the apparatus to the field device. The multi-pole main switch and the two-pole switch are ganged. This approach eliminates a separate DC power cable between the apparatus and the field device.

Abstract: A semiconductor switch circuit is provided that enables current consumption to be reduced even in a conduction state. A semiconductor switch circuit 100 has P-type MOS transistors Q101 and Q102 for conduction that share a source and are connected in series between an input/output terminal 101 and input/output terminal 102, a P-type MOS transistor Q103 and N-type MOS transistor Q105 having drains connected to the gate of Q101, a P-type MOS transistor Q104 and N-type MOS transistor Q106 having drains connected to the gate of Q102, and a control terminal 103 connected to the gates of the transistors. Further semiconductor switch circuit 100 is configured with the sources and back gates of Q103 and Q104 connected to the sources of Q101 and Q102. Therefore, it is possible to switch the path between input/output terminal 101 and input/output terminal 102 between a conduction state and non-conduction state by means of voltage control by voltage value Vcont of a control signal applied to control terminal 103.