System and method for providing power control of an energy storage system
First Claim
Patent Images
1. A control circuit for an energy storage system comprising a high side power source and a low side power source, the control circuit comprising:
- (a) a variable gain circuit comprising;
(i) an integrator to integrate a current of the high side power source to provide an integrated signal,(ii) a comparison circuit to obtain a comparison signal representative of a comparison of the integrated signal with a reference value of a state of charge of the high side power source,(iii) a gain adjustment circuit to use the comparison signal to provide a variable gain signal, wherein the gain adjustment circuit comprises a variable gain function circuit and a state of charge power limit function, wherein the variable gain function circuit receives the comparison signal from the comparison circuit and applies a variable gain function to the comparison signal to obtain the variable gain signal, and wherein the state of charge power limit function receives the variable gain signal from the variable gain function circuit and applies a limiting function to the variable gain signal;
(b) a fixed gain circuit configured to provide a fixed gain signal based on the current of the high side power source; and
(c) a power command creation circuit configured to combine the variable gain signal and the fixed gain signal to create a power command to control a power output of the low side power source.
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Abstract
A control circuit comprises a circuit adapted to determine a state of charge of a high side power source using a sensed output current to provide a variable gain signal based on the state of charge. The control circuit may also contain a circuit configured to provide a fixed gain signal based on the current of the high side power source and a circuit configured to combine the variable gain signal and the fixed gain signal to create a power command.
38 Citations
17 Claims
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1. A control circuit for an energy storage system comprising a high side power source and a low side power source, the control circuit comprising:
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(a) a variable gain circuit comprising; (i) an integrator to integrate a current of the high side power source to provide an integrated signal, (ii) a comparison circuit to obtain a comparison signal representative of a comparison of the integrated signal with a reference value of a state of charge of the high side power source, (iii) a gain adjustment circuit to use the comparison signal to provide a variable gain signal, wherein the gain adjustment circuit comprises a variable gain function circuit and a state of charge power limit function, wherein the variable gain function circuit receives the comparison signal from the comparison circuit and applies a variable gain function to the comparison signal to obtain the variable gain signal, and wherein the state of charge power limit function receives the variable gain signal from the variable gain function circuit and applies a limiting function to the variable gain signal; (b) a fixed gain circuit configured to provide a fixed gain signal based on the current of the high side power source; and (c) a power command creation circuit configured to combine the variable gain signal and the fixed gain signal to create a power command to control a power output of the low side power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power system comprising:
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a low side power source coupled to a traction boost converter; a high side power source coupled to the traction boost converter; and a control circuit configured to control a power output of the low side power source using a variable gain signal, wherein the control circuit comprises a variable gain circuit comprising; (i) an integrator to integrate a current of the high side power source to provide an integrated signal, (ii) a comparison circuit to obtain a comparison signal representative of a comparison of the integrated signal with a reference value of a state of charge of the high side power source, and (iii) a gain adjustment circuit to use the comparison signal to provide the variable gain signal, wherein the gain adjustment circuit comprises a variable gain function circuit and a state of charge power limit function, wherein the variable gain function circuit receives the comparison signal from the comparison circuit and applies a variable gain function to the comparison signal to obtain the variable gain signal, and wherein the state of charge power limit function receives the variable gain signal from the variable gain function circuit and applies a limiting function to the variable gain signal. - View Dependent Claims (12, 13, 14)
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15. A method for controlling an energy storage system comprising a high side power source and a low side power source coupled by a boost converter, the method comprising:
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integrating a current of the high side power source to provide an integrated signal, obtaining a comparison signal based on a comparison of the integrated signal with a reference value of a state of charge of the high side power source; using the comparison signal to provide a variable gain signal, wherein providing the variable gain signal comprises applying a variable gain function to the comparison signal to obtain the variable gain signal, and applying a limiting function to the variable gain signal; providing a fixed gain signal based on current from the high side power source; and combining at least the variable gain signal and the fixed gain signal to create a power command to control a power output of the low side power source. - View Dependent Claims (16, 17)
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Specification