Shunt voltage to digital power sequence conversion with auto-calibrated transconductor, error cancelling reference and current to power converter

A system to convert a detected voltage, that is indicative of current conducted by a switching circuit, to a series of electrical pulses that is indicative of electrical power dissipated by the switching circuit responsive to the current conducted by a switching circuit, the system comprising:

• a current-to-current converter circuit coupled to a transconductor circuit to receive a first current that is indicative of the detected voltage, the current-to-current converter circuit comprising:
• a current squaring circuit to amplify the first current by an arithmetic power of the first current;
• and
• a scaling circuit to scale the amplified first current based on a reference current to generate a second current;
• and
• a pulse quantizer coupled with an output of the transconductor circuit and configured to generate the series of electrical pulse that is indicative of electrical power dissipated by the switching circuit responsive to the current conducted by a switching circuit.

A method for generating a signal that is indicative of electrical power dissipated by a switching circuit, the method comprising:

• obtaining, from a sensing circuit, a sensed voltage that is indicative of current conducted by the switching circuit;
• converting, by a transconductor circuit, the sensed voltage to a first current, the transconductor circuit having a selectable transconductance determined by a provided reference voltage and a provided reference current;
• converting, using a power law converter circuit, the first current to a second current based on a dynamic resistance of the switching circuit;
• generating a series of one or more pulses that is indicative of electrical power dissipated by a switching circuit by:
• integrating the second current on a first capacitor;
• comparing a voltage across the first capacitor to a second reference voltage;
• generating an electrical pulse of the series of electrical pulses based on the comparison;
• and
• generating, by a compensation circuit, the second reference voltage based on the reference current and a timing signal, the reference having a value that automatically adjusts to compensate for variation in at least one of a capacitor value, the reference current, or a cycle time of the timing signal.