Ground isolating circuit

Claim 2

In a circuit comprising: a D.C. power supply having two power leads; a load having a resistive component connected to the D.C. power supply by the power leads; means in said circuit for generating a pulsating current component; and means providing a secondary current path connecting the D.C. power supply with the resistive load; the improvement comprising a transformer having a pair of windings and having very good inductive coupling between its windings, each of said windings being connected in series between a corresponding one of said power leads of the D.C. power supply and the load, whereby the pulsating current component in the secondary current path is reduced by equalizing the pulsating current components in the power leads.

Claim 3

A circuit as set forth in claim 1 wherein said means for generating a pulsating current is provided by said load.

Claim 4

A circuit as set forth in claim 1 wherein said transformer has a one-to-one turns ratio and a coupling coefficient of at least 0.95.

Claim 5

A circuit as set forth in claim 1 wherein said transformer has an inductive reactance at least 10 times as large as the impedance of the resistive load.

Claim 6

In circuitry comprising: a D.C. power supply having two power leads; a load having a resistive component connected to the D.C. power supply by the power leads; means in said D.C. power supply circuit for generating a pulsating current component; an alternating current signal circuit comprising a signal generating means, a signal transmitting means and leads therebetween, said signal circuit having an operating frequency band containing the frequency of the pulsating current component; and a secondary current path connecting the D.C. power supply with the load and connecting a portion of the signal circuit between said signal generating means and said signal transmitting means, whereby the power supply circuit is conductively coupled to the signal circuit; the improvement comprisIng a transformer having a primary winding and a secondary winding, said primary winding being connected between a first power lead and said load, said secondary winding being connected between a second power lead and said load, said transformer having very good inductive coupling between its windings, whereby the pulsating current component in the secondary current path is reduced by equalizing the pulsating current components in the power leads.

Claim 7

In circuitry comprising: a D.C. power supply having two power leads; a load having a resistive component connected to the D.C. power supply by the power leads; means in said D.C. power supply circuit for generating a pulsating current component; an alternating current signal circuit comprising a signal generating means, a signal transmitting means and leads therebetween, said signal circuit having an operating frequency band containing the frequency of the pulsating current component; and a secondary current path connecting the D.C. power supply with the load and connecting a portion of the signal circuit between said signal generating means and said signal transmitting means, whereby the power supply circuit is conductively coupled to the signal circuit; the improvement comprisIng a transformer having a primary winding and a secondary winding, said primary winding being connected between a first power lead and said load, said secondary winding being connected between a second power lead and said load, said transformer having very good inductive coupling between its windings, whereby the pulsating current component in the secondary current path is reduced by equalizing the pulsating current components in the power leads.

Claim 8

Circuitry as set forth in claim 5 wherein said alternating current signal circuit has an operating frequency band containing a harmonic of a fundamental frequency of the pulsating current component.

Claim 9

In a circuit comprising: a D.C. power supply having two power leads; a load having a resistive component connected to the D.C. power supply by the power leads, said load including means for generating a pulsating current component; a secondary current path connecting the D.C. power supply with the load; and an alternating current signal circuit comprising a signal generating means, a signal transmitting means, and leads therebetween, said leads being inductively coupled to the secondary current path, said signal circuit having an operating frequency band containing the frequency of the current pulsating component; the improvement comprising a two winding transformer having very good inductive coupling between its windings, each of said windings being connected in series between a corresponding one of said power supply leads and the load, whereby the pulsating current component in the secondary path is reduced by equalizing the pulsating currents in the power leads.

Claim 10

In a circuit comprising: a D.C. power supply having two power leads; a load having a resistive component connected to the D.C. power supply by the power leads, said load including means for generating a pulsating current component; a secondary current path connecting the D.C. power supply with the load; and an alternating current signal circuit comprising a signal generating means, a signal transmitting means, and leads therebetween, said leads being inductively coupled to the secondary current path, said signal circuit having an operating frequency band containing the frequency of the current pulsating component; the improvement comprising a two winding transformer having very good inductive coupling between its windings, each of said windings being connected in series between a corresponding one of said power supply leads and the load, whereby the pulsating current component in the secondary path is reduced by equalizing the pulsating currents in the power leads.

Claim 11

In a circuit as set forth in claim 7 wherein said alternating current signal circuit has an operating frequency band containing a harmonic of the fundamental frequency of the pulsating current component.

Claim 12

In a circuit comprising a D.C. power supply and a load having a resistive component with a secondary current path in a ground loop, the improvement comprising a transformer having a pair of windings, a first winding being connected in series between a first end of said D.C. power supply and said load, a second winding being connected in series between a second end of said D.C. power supply and said load for reducing the A.C. currents in said ground loop.

Claim 13

In a circuit comprising a D.C. power supply and a load having a resistive component with a secondary current path in a ground loop, the improvement comprising a transformer having a pair of windings, a first winding being connected in series between a first end of said D.C. power supply and said load, a second winding being connected in series between a second end of said D.C. power supply and said load for reducing the A.C. currents in said ground loop.

Claim 14

In a circuit as set forth in claim 9, said transformer having a one-to-one turns ratio and a coupling coefficient of at least 0.95.