AC active load

摘要

An AC active load device for use with a generator and a controller to supply a variable impedance when supplied with an AC waveform. The AC active load device uses a transformer and one or more transistors to generate an average max load impedance greater than 1000 ohms over varying voltage levels. The transistor functions as a dynamically-controlled resistor to the generator when the generator supplies the AC voltage to the transformer. The transistors may be GaN FETs or LDMOSFETs. The transformer steps down a voltage supplied by a generator to a voltage below the threshold voltage of the transistors. A control voltage is supplied to the gate of the transistors and may be controlled by a controller. A voltage and current are outputted to the controller from the AC active load device. The AC active load device may be used to calibrate the generator.

主权项

1. An AC active load device, comprising:
a transformer configured to step down an AC voltage supplied by a generator; a control voltage supply; and a first transistor connected to the control voltage and the transformer, wherein the first transistor functions as a dynamically-controlled resistor to the generator when the generator supplies the AC voltage to the transformer.