Electricity: power supply or regulation systems – External or operator controlled – Zero switching
Reexamination Certificate
2000-04-24
2001-08-07
Sterrett, Jeffrey (Department: 2838)
Electricity: power supply or regulation systems
External or operator controlled
Zero switching
C323S324000
Reexamination Certificate
active
06271653
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to the field of power supplies and more particularly to a power supply that receives its input from a power electronic switch and which is operable over a wide range of input voltage waveforms including a short duration pulse.
2. Description of the Related Art
Control circuits for electrical power systems typically require power supplies that are independent of the status of any particular source or device being controlled. This often requires separate and redundant transformers or a back-up battery supply etc. Since this involves additional connections, power derivation circuits, and non-renewable energy sources, the reliability of the control circuits is compromised which is detrimental to appropriate control of the system including power electronic switches under the control of the control circuitry.
SUMMARY OF THE INVENTION
Accordingly, it is a principal object of the present invention to provide a power supply for low voltage circuits that is powered by a power electronics switch that is controlled by the low voltage circuits regardless of the operating status of the power electronics switch.
It is another object of the present invention to provide a power supply that is operative with a wide range of input voltages including short duration periodic input.
These and other objects of the present invention are efficiently achieved by an arrangement to provide 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.
REFERENCES:
patent: 4300090 (1981-11-01), Weber
patent: 4878010 (1989-10-01), Weber
patent: 4948987 (1990-08-01), Weber
Klippel Todd W.
Mears Gregory C.
Lapacek James V.
S & C Electric Company
Sterrett Jeffrey
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