Electronic transformer

A bilateral electronic transformer having a primary port for connection with a signal generator having an impedance and a secondary port for connection with a load impedance, comprising first and second out of phase sinking and sourcing current sources each for receiving a control signal at an input thereto and for generating at an output therefrom a current flow having a magnitude in accordance with the value of said control signal, said current flows being opposite in phase and said first current source output being coupled with said primary port and said second current source output being coupled with said secondary port for controlling voltages thereat;

• and circuit means coupled with said primary and secondary ports for comparing voltages thereat, said circuit means having an output coupled with said inputs to said current sources and generating said control signal at said output, said control signal having a value in accordance with the difference in values of the primary and secondary port voltages times a constant, wherein the difference in value between the primary and secondary port voltages is inversely proportional to the value of the load impedance times the same constant, said circuit means including differential amplifier means having an output coupled with said current source inputs and a pair of inputs, means for applying a reference potential to one of said differential amplifier means inputs, and summing circuit means coupled with said other differential amplifier means input and with said primary and secondary ports for applying to said other input a voltage representative of the difference in the values of the voltages at said primary and secondary ports, whereby signals at said primary port are sunk by said first current source and sourced by said second current source and signals at said secondary port are sunk by said second current source and sourced by said first current source.

A bilateral electronic transformer having a primary port for connection with a signal generator having an impedance and a secondary port for connection with a load impedance, comprising first and second out of phase sinking and sourcing current sources, each for receiving a control signal at an input thereto and for generating at an output therefrom a current flow having a magnitude in accordance with the value of said control signal, said current flows being opposite in phase and said first current source output being coupled with said primary port and said second current source output being coupled with said secondary port for controlling voltages thereat;

• and circuit means coupled with said primary and secondary ports for comparing the voltages thereat, said circuit means having an output coupled with said inputs to said current sources and generating said control signal at said output, said control signal having a value in accordance with the difference in values of the primary and secondary port voltages times a constant, wherein the difference in values between the primary and secondary port voltages is inversely proportional to the value of the load impedance times the same constant and said first current source is an inverting voltage to current source having a transconductance K1, said second current source is a noninverting voltage to current source having a transconductance K2, and said circuit means is coupled with said primary port through a first voltage amplifier having a gain K3 and with said secondary port through a second voltage amplifier having a gain K4.

A bilateral electronic transformer having first and second ports, comprising an inverting voltage to current converter having an output coupled with said first port for controlling a voltage thereat;

• a noninverting voltage to current converter having an output coupled with said second port for controlling a voltage thereat, said voltage to current converters being out of phase sinking and sourcing voltage to current converters and each having an input for receiving a control voltage signal and generating at its output a current flow having a magnitude in accordance with the value of said control signal, said current flows being opposite in phase;
• and means for generating said control signal, said means including amplifier means for generating at an output therefrom said control signal, said output being coupled with said voltage to current converter inputs, and means coupling at least one input to said amplifier means with voltages at said first and second ports so that said control signal has a value in accordance with the difference in values between the voltages at said first and second ports times a constant, said means coupling said at least one amplifier means input to the voltages at said first and second ports comprising an inverting voltage amplifier connected at an input thereto with said first port and having an output, a noninverting voltage amplifier connected at an input thereto with said second port and having an output, and first and second impedance means connected in series between said outputs from said voltage amplifiers and at a juncture therebetween with said at least one amplifier means input, whereby signals at said first port are sunk by said inverting voltage to current converter and sourced by said noninverting voltage to current converter and signals at said second port are sunk by said noninverting voltage to current converter and sourced by said inverting voltage to current converter.

An electronic transformer having first and second ports, comprising a first inverting voltage to current converter having an output coupled with said first port for controlling a voltage thereat;

• a second inverting voltage to current converter having an output coupled with said second port for controlling a voltage thereat, each said inverting voltage to current converter having an input for receiving a voltage and generating at its output a current flow having a magnitude in accordance with said voltage;
• a first inverting voltage amplifier connected at an output therefrom with said input to said second inverting voltage to current converter and having an input;
• amplifier means for generating a control voltage signal at an output therefrom, said output being coupled with the inputs of each of said first voltage to current converter and said first inverting voltage amplifier;
• and means for coupling at least one input to said amplifier means with the voltages at said first and second ports so that said control voltage, and therefore the current flows from said voltage to current converters, have values in accordance with the difference in value of the voltages at said first and second ports.