Tubular led ballast buck-boost converter

A tubular light emitting diode (LED) ballast including a buck-boost converter circuit, comprising:

• a first switch having a first end and a second end;
• a first loop including:
• an inductor having a first end and a second end;
• a first diode having a cathode end and an anode end, wherein the cathode end of the first diode is coupled to the first end of the inductor and the second end of the first switch;
• and
• a second switch having a first end and a second end;
• and
• a second loop including:
• a second diode having a cathode end and an anode end, wherein the anode end of the second diode is coupled to the second end of the inductor and the first end of the second switch;
• a capacitor having a first end and a second end, wherein the second end of the capacitor is coupled to the second end of the second switch and the anode end of the first diode and wherein the first end of the capacitor is coupled to the cathode end of the second diode.

A tubular light emitting diode (LED) ballast including a buck-boost converter circuit, comprising:

• a first switch having a first end and a second end;
• an inductor having a first end and a second end;
• a first diode having a cathode end and an anode end, wherein the cathode end of the first diode is coupled to the first end of the inductor and the second end of the first switch;
• a second switch having a first end and a second end;
• a second diode having a cathode end and an anode end, wherein the anode end of the second diode is coupled to the second end of the inductor and the first end of the second switch;
• and
• a capacitor having a first end and a second end, wherein the second end of the capacitor is coupled to the second end of the second switch and the anode end of the first diode and wherein the first end of the capacitor is coupled to the cathode end of the second diode,
• wherein in a first, buck-boost converter mode, the first switch and the second switch are driven by a waveform input signal,
• wherein in a second, buck converter mode, the first switch is driven by the waveform input signal and the second switch is open, and
• wherein in a third, boost converter mode, the first switch is closed and the second switch is driven by the waveform input signal.