AC current control of mobile battery chargers
First Claim
1. An onboard charging method for an energy storage system of an electric vehicle, the method using an AC power source, the method comprising the steps of:
- a) evaluating a first process control loop to set a reference DC current responsive to a difference between a DC target voltage for the energy storage system and a voltage feedback for the energy storage system, said first process control loop setting said reference DC current at a value ranging between a target discharging current and a target charging current for the energy storage system; and
b) evaluating a second process control loop to set a control signal responsive to a difference between said reference DC current and a generated DC current provided to the energy storage system for charging, said second process control loop setting said control signal at a value ranging between a maximum DC discharging current and a maximum DC charging current derived from an available real-time AC current; and
c) controlling a charger onboard the electric vehicle responsive to said control signal to produce said generated DC current.
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Accused Products
Abstract
A charging system and method that improves utilization of available AC power during onboard charging of energy storage systems of electric vehicles. An onboard charging method for an energy storage system of an electric vehicle, the method using an AC power source, includes a) establishing a maximum DC charging current for the energy storage system responsive to a control signal indicating real-time available current/power from the AC source; and b) controlling a charging system to provide an actual DC charging current, up to the maximum DC charging current, to the energy storage system.
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Citations
20 Claims
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1. An onboard charging method for an energy storage system of an electric vehicle, the method using an AC power source, the method comprising the steps of:
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a) evaluating a first process control loop to set a reference DC current responsive to a difference between a DC target voltage for the energy storage system and a voltage feedback for the energy storage system, said first process control loop setting said reference DC current at a value ranging between a target discharging current and a target charging current for the energy storage system; and b) evaluating a second process control loop to set a control signal responsive to a difference between said reference DC current and a generated DC current provided to the energy storage system for charging, said second process control loop setting said control signal at a value ranging between a maximum DC discharging current and a maximum DC charging current derived from an available real-time AC current; and c) controlling a charger onboard the electric vehicle responsive to said control signal to produce said generated DC current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An onboard charging method for an energy storage system of an electric vehicle, the method using an AC power source, the method comprising the steps of:
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a) evaluating a first process control loop to set a reference DC current responsive to a difference between a DC target voltage for the energy storage system and a maximum DC voltage for the energy storage system, said first process control loop setting said reference DC current at a value ranging between a target discharging current and a target charging current for the energy storage system; and b) evaluating a second process control loop to set a control signal responsive to a difference between said reference DC current and a generated DC current provided to the energy storage system for charging, said second process control loop setting said control signal at a value ranging between a maximum DC discharging current and a maximum DC charging current derived from an available real-time AC power; and c) controlling a charger onboard the electric vehicle responsive to said control signal to produce said generated DC current. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An electronic system for charging an energy storage system of an electric vehicle, comprising:
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a first process control loop setting a reference DC current responsive to a difference between a DC target voltage for the energy storage system and a voltage feedback for the energy storage system, said first process control loop setting said reference DC current at a value ranging between a target discharging current and a target charging current for the energy storage system; a second process control loop setting a control signal responsive to a difference between said reference DC current and a generated DC current provided to the energy storage system for charging, said second process control loop setting said control signal at a value ranging between a maximum DC discharging current and a maximum DC charging current derived from an available real-time AC current; and a charger onboard the electric vehicle producing said generated DC current responsive to said control signal. - View Dependent Claims (17, 18)
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19. An electronic system for charging an energy storage system of an electric vehicle, comprising:
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a first process control loop setting a reference DC current responsive to a difference between a DC target voltage for the energy storage system and a maximum DC voltage for the energy storage system, said first process control loop setting said reference DC current at a value ranging between a target discharging current and a target charging current for the energy storage system; a second process control loop setting a control signal responsive to a difference between said reference DC current and a generated DC current provided to the energy storage system for charging, said second process control loop setting said control signal at a value ranging between a maximum DC discharging current and a maximum DC charging current derived from an available real-time AC current; and a charger onboard the electric vehicle producing said generated DC current responsive to said control signal. - View Dependent Claims (20)
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Specification