Importance

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Abstract

A device is described for driving resistive heating of one or more transparent oxide conductors supported by a transparent substrate. The device includes a driver circuit having an input for connection to a power supply and an output for connection to the one or more transparent oxide conductors. The driver circuit is configured to output a pulse-width modulated drive signal having a duty cycle. The device is configured to measure an impedance across the output. The device is also configured to control the driver circuit to output the drive signal in dependence upon the impedance. The device is configured to operate in one or more power modes. For each power mode, the device is configured to adjust the duty cycle of the pulse-width modulated drive signal to maintain the power dissipated by the drive signal at the pre-set power value corresponding to the active power mode.

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First Claim