Zero voltage switching buck derived converter
AssigneeArgus Technologies Ltd.
InventorChristopher Donovan Davidson
Life of this patent
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Abstract
A buck derived isolated DC-DC converter includes a half or full bridge of switching devices which are asymmetrically controlled so that top and bottom switches are opened and closed at mutually exclusive times. Primary side and secondary side DC blocking capacitor(s) and a small valued inductor are placed in series with an isolation transformer. A single secondary rectification uncontrolled switch and inductor-capacitor output filter are included. Additionally a voltage clamping circuit is added across the rectifier which includes an active switch which also may be connected to a tap on the output inductor.
Claims23
A switch mode DC to DC converter comprising input and output terminals, a transformer having a primary and a secondary windings, an input stage comprising a half bridge arrangement of asymmetrically controlled switches, at least one DC blocking capacitor in series with said primary winding, and an output stage having an output capacitor with one end connected to a first end of an output inductor and the output capacitor being connected in parallel with the output terminals, and further including a secondary DC blocking capacitor in series with the secondary winding and one end of the series combination of secondary DC blocking capacitor and secondary winding being connected to a second end of the output inductor, and an output diode connected across the series combination of the secondary winding and the secondary DC blocking capacitor.
A switch mode DC to DC converter comprising a full bridge arrangement of asymmetrically controlled switches, input and output terminals, a transformer having a primary and a secondary windings, a primary DC blocking capacitor in series with said primary winding, and an output stage having an output capacitor with one end connected to a first end of an output inductor and the output capacitor being connected in parallel with the output terminals, and further including a secondary DC blocking capacitor in series with the secondary winding and one end of the series combination of secondary DC blocking capacitor and secondary winding being connected to a second end of the output inductor, and an output diode connected across the series combination of the secondary winding and the secondary DC blocking capacitor.
A switch mode DC to DC converter comprising a half bridge arrangement of asymmetrically controlled switches, input and output terminals, a transformer having a primary and a secondary windings, a primary DC blocking capacitor in series with said primary winding, and an output stage having an output capacitor with one end connected to a first end of an output inductor and the output capacitor being connected in parallel with the output terminals, and further including a secondary DC blocking capacitor in series with said secondary winding, one end of said series combination of secondary DC blocking capacitor and secondary winding being connected to a tap on the output inductor, and an output diode connected across the series combination of the secondary winding and the secondary DC blocking capacitor, and said converter further comprising a series combination of first diode means and a clamping capacitor said series combination being connected across said output diode, one end of said first diode means being connected to said tap and said first diode means being poled to conduct current in the opposite direction to the normal direction of current flow in the output diode, a controlled energy recovery switch in series with second diode means, said series combination of energy recovery switch and second diode means being connected from the common point between said first diode means and said clamping capacitor on the one hand and a second end of the output inductor on the other hand, both said energy recovery switch and said second diode means being poled to conduct current from the clamping capacitor to the output inductor when said energy recovery switch in ON.
A switch mode DC to DC converter comprising a full bridge arrangement of asymmetrically controlled switches, input and output terminals, a transformer having a primary and a secondary windings, and an output stage having an output capacitor with one end connected to a first end of an output inductor and the output capacitor being connected in parallel with the output terminals, and further including a secondary DC blocking capacitor in series with the secondary winding, one end of said series combination of secondary DC blocking capacitor and secondary winding being connected to a tap on the output inductor, and an output diode connected across the combination of the secondary winding and the secondary DC blocking capacitor, and said converter further comprising a series combination of first diode means and a clamping capacitor said series combination of first diode means and clamping capacitor being connected across said output diode, one end of said first diode means being connected to said tap and said first diode means being poled to conduct current in the opposite direction to the normal direction of current flow in the output diode, a controlled energy recovery switch in series with second diode means, said series combination of energy recovery switch and second diode means being connected from the common point between said first diode means and said clamping capacitor on the one hand and a second end of the output inductor on the other hand, both said energy recovery switch and said second diode means being poled to conduct current from the clamping capacitor to the output inductor when said energy recovery switch in ON.
A switch mode DC to DC converter comprising input and output terminals, a transformer having a primary and a secondary windings, an input stage comprising a half bridge arrangement of asymmetrically controlled switches, at least one capacitor operative for blocking DC through said primary winding, and an output stage having an output capacitor with one end connected to a first end of an output inductor and the output capacitor being connected in parallel with the output terminals, and further including a secondary DC blocking capacitor in series with the secondary winding and one end of the series combination of secondary DC blocking capacitor and secondary winding being connected to a second end of the output inductor, and an output diode connected across the series combination of the secondary winding and the secondary DC blocking capacitor.
Dependencies are inferred from the claim text.