On-chip power supply for 110 V line input

A 265 V<formula formulatype="inline"><tex Notation="TeX">$_{\rm RMS}$</tex></formula> Mains Interface Integrated in 0.35 <formula formulatype="inline"><tex Notation="TeX">$\mu$</tex></formula>m CMOS

“…With the mains voltage input exceeding the rated voltage of the active circuitry by two orders of magnitude, it is required to create a voltage gap between the mains input and the active circuit. This can be achieved by placing a series impedance [3] over which the voltage is dropped. As discussed in [3], it is possible to use a resistor.…”

“…This can be achieved by placing a series impedance [3] over which the voltage is dropped. As discussed in [3], it is possible to use a resistor. Such an approach would have a very low efficiency due to the very large voltage drop and is therefore undesirable.…”

“…This work proposes to use a series capacitor as a capacitve step-down due to its interaction with the load and the power management regulation circuits located behind the rectifier, showing similarity to [3]. But other than in [3] however, this work targets the use of a CMOS technology by moving the high voltage towards the integrated passive components.…”

“…Previous research in the area concentrated on the feasibility of a high voltage input integrated power supply by using the high voltage capability of a silicon on sapphire (SOS) technology [3] to implement circuits capable of interfacing the mains input. To circumvent the need for high voltage active circuits, a capacitive division of the input voltage has been presented by [4] to reduce the required voltage rating of the subsequent power management circuits.…”

A power supply IC for 120/240-VAC line input

“…The feasibility of an on chip power supply was demonstrated by Pomper et al (1) in 1978. Using the EFSI SOS dielectrically isolated process the authors in (1) were able to fabricate a 110-V on chip supply with 10-V output and 10-mA output current.…”