Transformer coupled current capping power supply topology
First Claim
1. A load transfer system for switching a load in a transformer having a first input winding corresponding to a primary side and a second input winding corresponding a secondary side, the load transfer system comprising:
- a first source of power selectively supplied to the first input winding through activation of a first duty cycle associated with a first switch coupled to the first input winding;
a second source of power selectively supplied to the second input winding through activation of a second duty cycle associated with a second switch coupled to the second input winding; and
a controller configured to;
monitor an input voltage (Vin) supplied to the first input winding that is inductively transferring power to the output winding,determine Vin is below a threshold input voltage,incident to said determination, adjust the second duty cycle associated with the second switch to supply the second source of power to the second input winding to inductively transfer additional power from the second input winding with the inductively transferred power from the first input winding to the output winding, andincrease the first duty cycle associated with the first switch by a step rate based on the additional supply of the second source of power to the second input winding.
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Accused Products
Abstract
Described is a technology by which magnetic flux is used to provide backup power. A transformer has a line power source controllably coupled to a first input winding, and secondary power source controllably coupled to a second input winding. A controller monitors the line power and switches to the secondary power source if the line power voltage drops too low, or uses the secondary power source to augment the line power source if the line power current gets too high. Also described is incrementally transitioning from the secondary power source back to the line power source.
30 Citations
20 Claims
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1. A load transfer system for switching a load in a transformer having a first input winding corresponding to a primary side and a second input winding corresponding a secondary side, the load transfer system comprising:
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a first source of power selectively supplied to the first input winding through activation of a first duty cycle associated with a first switch coupled to the first input winding; a second source of power selectively supplied to the second input winding through activation of a second duty cycle associated with a second switch coupled to the second input winding; and a controller configured to; monitor an input voltage (Vin) supplied to the first input winding that is inductively transferring power to the output winding, determine Vin is below a threshold input voltage, incident to said determination, adjust the second duty cycle associated with the second switch to supply the second source of power to the second input winding to inductively transfer additional power from the second input winding with the inductively transferred power from the first input winding to the output winding, and increase the first duty cycle associated with the first switch by a step rate based on the additional supply of the second source of power to the second input winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for controlling load transfer in a transformer having a first input winding supplied with a first source of power that is selectively supplied by varying a first duty cycle to a first switch and corresponding to a primary side, a second input winding supplied with a second power source that is selectively supplied by varying a second duty cycle to a second switch and corresponding to a secondary side, the method comprising:
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monitoring an input voltage (Vin) supplied to the first input winding that is inductively transferring power to the output winding; determining Vin is below a threshold input voltage; incident to said determination, adjusting the second duty cycle associated with the second switch to supply the second source of power to the second input winding to inductively transfer additional power from the second input winding with the inductively transferred power from the first input winding to the output winding; and increasing the first duty cycle associated with the first switch by a step rate based on the additional supply of the second source of power to the second input winding. - View Dependent Claims (15, 16, 17)
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18. One or more computer-storage media comprising computer-executable instructions for controlling load transfer in a transformer having a first input winding corresponding to a primary side that is selectively supplied by varying a first duty cycle to a first switch and a second input winding corresponding a secondary side that is selectively supplied by varying a second duty cycle to a second switch, the computer-executable instructions causing one or more processors to perform operations comprising:
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monitoring an input voltage (Vin) supplied to the first input winding that is inductively transferring power to the output winding; determining Vin is below a threshold input voltage; incident to said determination, adjusting the second duty cycle associated with the second switch to supply the second source of power to the second input winding to inductively transfer additional power from the second input winding with the inductively transferred power from the first input winding to the output winding; and increasing the first duty cycle associated with the first switch by a step rate based on the additional supply of the second source of power to the second input winding. - View Dependent Claims (19, 20)
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Specification