Transformer for d-c signals
OwnerKurt Smutnyinventor
Life of this patent
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Abstract
In the d-c transformer of the present invention a current changing between two maximum values of opposite polarity is impressed on the secondary winding of the transformer. One input of a multiplier is coupled in parallel across the secondary winding and the other input coupled to a current value measuring device in the circuit of the secondary winding with the multiplier providing output signals which are proportional to the d-c signals at the input of the primary side of the transformer.
Claims6
In a transformer for d-c signals having a primary winding through which a d-c current flows, a core of magnetically soft material and a secondary winding which is acted upon by an electrical variable having a polarity which changes if the core reaches saturation, with a current measuring device coupled to the secondary, the improvement comprising:
- a. means coupled to the secondary winding to cause it to be acted upon by a current which continuously changes between two maximum values of opposite polarity;
- b. a measuring resistor in series with the secondary winding;
- c. a multiplier having one input coupled across said measuring resistor and another input coupled across said secondary winding, said multiplier providing two complementary outputs;
- d. a double-throw switch alternately coupling the current measuring device to one and the other complementary outputs of said multiplier;
- and
- e. means to switch said double-throw switch from one output to the other output each time a positive or negative maximum value of current is reached.
Dependencies are inferred from the claim text.