Parallel devices having balanced switching current and power

A power circuit, comprising:

• a voltage supply that provides electrical power;
• a current source that provides substantially constant current over a predetermined current range;
• a control voltage source;
• a first driving transistor having a first gate, a first source connection, and a first kelvin source connection, wherein the first gate and the first kelvin source connection are electrically connected to the control voltage source;
• a second driving transistor having a second gate, a second source connection, and a second kelvin source connection, wherein the second gate and the second kelvin source connection are electrically connected to the control voltage source;
• and
• means for inductively coupling the first and second source connections.

A circuit comprising

• a direct current voltage supply;
• two driving transistors disposed in parallel and receiving electrical power from the voltage supply, each of the two driving transistors includes a gate terminal, a source connection, and a kelvin source connection;
• and
• a voltage source that provides a control signal to the two driving transistors, including:
• a first terminal connected to the gate terminals of the two driving transistors, and
• a second terminal connected to the kelvin source connections of the two driving transistors;
• wherein inductances of the source connections are configured to improve current balancing of the two driving transistors.

A circuit for driving parallel transistors, comprising

• a voltage supply;
• at least two power transistors disposed in parallel and receiving electrical energy from the voltage supply, each of the at least two power transistors includes a gate terminal, a source connection, and a kelvin source connection;
• and
• a voltage source that controls an operation of the at least two power transistors, including:
• a first terminal electrically coupled to the gate terminals of the at least two power transistors, and
• a second terminal electrically coupled to the kelvin source connections of the at least two power transistors;
• wherein inductances of the kelvin source connections are configured to improve current balancing of the at least two power transistors.

A system comprising:

• two power transistors disposed in parallel, wherein each of the two driving transistors includes a gate terminal, a source connection, and a kelvin source connection;
• a power source that provides electrical energy to the two power transistors;
• and
• a voltage controller having a first terminal and a second terminal, wherein the voltage controller provides at least a control signal to the gate terminals of the two power transistors to activate the two power transistors;
• wherein resistances of the kelvin source connections are configured to reduce a difference in drain currents of the two power transistors.

A circuit, comprising:

• a voltage supply that provides electrical power to the circuit;
• a current source that provides substantially constant current over a predetermined current range;
• a control voltage source;
• a first power transistor having a first gate, a first source inductor, and a first kelvin source resistor, wherein the first gate and the first kelvin source resistor are electrically coupled to the control voltage source;
• and
• a second power transistor having a second gate, a second source inductor, and a second kelvin source resistor, wherein the second gate and the second kelvin source resistor are electrically coupled to the control voltage source;
• wherein resistances of the first and second kelvin source resistors and inductances of the first and second source inductors are configured to reduce a difference in drain currents of the first and second power transistors.