Offset current implementation for battery charger
First Claim
1. A transport refrigeration unit (TRU) battery charging system, comprising:
- a programmable transport refrigeration system (TRS) Controller;
a TRU battery; and
a programmable battery charger (BC) programmed to transfer electrical current to the TRU battery in response to a value of offset current drawn from the TRU battery by the programmable TRS Controller and subsequently communicated to the programmable BC by the programmable TRS Controller.
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Accused Products
Abstract
A transport refrigeration unit (TRU) battery charging system includes a programmable transport refrigeration system (TRS) Controller, a TRU battery and a programmable battery charger (BC) programmed to transfer electrical current to the TRU battery via a predetermined current path through the programmable TRS Controller in response to a value of offset current drawn from the TRU battery by the programmable TRS Controller and subsequently communicated to the programmable BC by the programmable TRS Controller. The programmable TRU battery charger allows for a dynamic load characterization of the programmable IRS Controller and accessory loads based on programmable TRU battery charger internal shunt current measurements and programmable TRS Controller internal shunt current measurements to allow the programmable TRU battery charger to function properly with all intended modes of operation.
28 Citations
16 Claims
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1. A transport refrigeration unit (TRU) battery charging system, comprising:
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a programmable transport refrigeration system (TRS) Controller; a TRU battery; and a programmable battery charger (BC) programmed to transfer electrical current to the TRU battery in response to a value of offset current drawn from the TRU battery by the programmable TRS Controller and subsequently communicated to the programmable BC by the programmable TRS Controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating a transport refrigeration unit (TRU) battery charging system, the method comprising:
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programming a programmable transport refrigeration system (TRS) Controller to measure a value of offset current drawn from a TRU battery by the programmable TRS Controller during a null mode voltage measurement of the TRU battery by a programmable battery charger connected to the TRU battery; and communicating the value of offset current to the programmable battery charger such that the programmable battery charger operates in a desired stage of TRU battery charging based on the value of offset current.
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11. A method of operating a transport refrigeration unit (TRU) battery charging system, the method comprising:
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programming a programmable transport refrigeration system (TRS) Controller to intermittently measure a value of offset current (I_TRU_Shunt) drawn from a TRU battery by the programmable TRS Controller; programming a programmable TRU battery charger (BC) to intermittently measure a load current (I_Batt) sourced via the programmable TRU battery charger; intermittently communicating the value of TRS Controller offset current (I_TRU_Shunt) to the programmable TRU BC, wherein the programmable TRU BC is connected to the TRU battery; and controlling a TRU battery charge mode of the programmable TRU BC based on an offset current value represented as (I_Batt)−
(I_TRU_Shunt). - View Dependent Claims (12, 13, 14, 15, 16)
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Specification