Power supply operable with wide input range
AssigneeS&C Electric Company
InventorsGregory C. Mears, Todd W. Klippel
Life of this patent
Estimating the term…
Abstract
An arrangement provides a power supply for low voltage circuits that is connected to receive and store energy from a power electronics switch that is connected to an alternating current supply. The power supply is operative over a wide range of input and regardless of the operating status of the power electronics switch. For each half cycle of the alternating current which the power electronic switch is to be rendered conductive, the arrangement delays for a predetermined time duration the control of the power electronic switch at the zero crossing of the half cycle. During the predetermined time duration, the power supply charges an energy storage device with sufficient energy to supply the low voltage circuit until the next half cycle.
Claims19
An arrangement for supplying power to a low voltage load from a power electronic switch supplied by an alternating current supply, the arrangement comprising:
- first means for delaying the control of the power electronic switch for a predetermined time duration at the zero crossing of each half wave of the alternating current supply for which the power electronic switch is to be rendered conductive;
- second means connected to the power electronic switch for storing energy during said predetermined time duration;
- and
- third means for supplying the load via energy from the energy storage device during the remainder of the half cycle.
An arrangement connected across a source of power in an alternating current circuit comprising first means responsive to a range of input from a brief pulse every half-cycle to a full half cycle for supplying continuous power to a load, said first means comprising energy storage means and constant current means responsive to said energy storage means.
A power supply connected across a power electronic switch supplied with an alternating current supply and being selectively rendered conductive each half cycle, the power supply comprising:
- energy storage means for storing energy during a small portion of each half cycle of the waveform;
- regulator means;
- and
- constant current source means responsive to said energy storage means and supplying current to said regulator means.
A method of supplying power to a low voltage load from an alternating current supply across a power electronic switch comprising the steps of:
- delaying the control of the power electronic switch for a predetermined time duration at the zero crossing of each half wave of the alternating current supply for which the power electronic switch is to be rendered conductive,
- charging an energy storage device during the predetermined time duration;
- and
- supplying the load via energy from the energy storage device during at least the remainder of the half cycle.
Dependencies are inferred from the claim text.