A current transducer for rugged environments uses a solid permalloy core including a magnetic gap for a Hall effect generator and rigid mounting extensions.

The invention relates to a current mirror circuit (28) comprising: an input node (29); a first simple current mirror (30) of a first type, such as pnp bipolar technology, having an input coupled to said input node (29) and an output; a second simple current mirror (32) of a second semiconductor type, such as npn bipolar technology, having an input coupled to said output of said first simple current mirror and an output; a third simple current mirror (34) of said first semiconductor type having a...

A circuit arrangement includes a lamp filament (1) as a load and a resistor (2) in series with the filament. For detecting the current through the load, the source of a MOSFET (6) is connected with the end of the resistor remote from the filament, the drain of the MOSFET being connected with the other end of the resistor via the primary winding of a step-up transformer (7) and a further resistor (8), a diode (9) being connected between the source and the drain of the MOSFET. If the MOSFET is tur...

A current amplifier has an input terminal (1) for an input current (Iin) to be amplified in order to obtain a first output current (Iout1) at a first output terminal (2) via a first transistor (T1) and a second output current (Iout2) at a second output terminal (8) via a current mirror (6). A diode-connected transistor (T5) is coupled between the emitter of the first transistor and the input terminal of the current amplifier so as to improve the current branching at the input terminal, thereby e...

Method and apparatus for independently, adjustably limiting both the peak current and average current in a switching servo amplifier.

A current stabilizing arrangement with a first and a second current circuit in which currents with a fixed ratio relative to each other are sustained. These currents respectively flow through a first semiconductor junction and a second semiconductor junction, a resistor being alternately connected in series with the first and second semiconductor junction. The currents flowing in the first and the second current circuit are interchanged in synchronism therewith.

A current transformer is encapsulated in an injection molded layer of insulating material. The current transformer includes a secondary terminal assembly having individual terminals mounted on a terminal board. The terminal board is formed of a material that softens within the normal processing temperature range of the encapsulating material and forms an amalgamation therewith without a distinct interface between the terminal board and the encapsulating material which thereby provides a fluid-ti...

A current limiter for an a.c. circuit having two FET's connected source to drain. The FET's are biased for symmetrical bipolar operation with source resistors for self-biasing. In operation one FET operates as a source follower and the other as a current source.

A current limiter such as a thermistor has a slow response time and inserts appreciable loss to normal signal currents that do not need limiting. The present invention uses a diode quad (6,7,8 and 9) arranged in a full-wave rectifier configuration. The AC terminals of the quad are inserted in series in the circuit whose current is to be limited. The DC terminals are connected to receive a DC bias current from a constant current source (P, R1). A signal from a signal generator (1) flows through a...

A high-voltage current transformer has an external inductance element electrically connected thereto. The inductance element has a relatively low magnitude of inductance, compared with the inductance of the current transformer, to cause a substantial increase in the excitation current which significantly reduces the residual flux in the current transformer.