Display system for a battery monitoring circuit
First Claim
1. A display system for a battery monitoring system having a battery that has a rated maximum capacity and an actual capacity, comprising:
- a battery monitoring circuit for determining the charge state of the battery and the actual capacity of the battery and representing the charge state of the battery with a charge state value and the actual capacity of the battery as an actual capacity value;
a register for storing a user programmed rated maximum capacity value representing the rated maximum capacity of the battery as defined by the user;
a display element for displaying the charge state of the battery which ranges from a lower capacity value to an upper capacity value; and
a display controller for operating said display element in either an absolute full mode or in a relative full mode, said display controller when operating in said absolute full mode operable to set said upper capacity value to said maximum capacity value stored in said register and to display the charge state value in said display element as relative to said maximum capacity value, said display controller when operating in said relative full mode operable to set said upper capacity value to the actual capacity and to display in said display element the charge state.
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Accused Products
Abstract
A battery detect circuit (32) is connected to a battery, with the current A battery V:the battery and the current extracted from the battery measured with a sense resistor (50) and convened to charge and discharge voltages with a V/F converter (52). A microcontroller (64) is operable to increment a nominal available charge (NAC) register (180) during a charge operation and to increment a discharge rate counter (DCR) (184) during a discharge operation. The NAC register (180) indicates the available charge, i.e. the charge state of the battery, which value is output to a display (34). The display (34) is controlled to operate in either an absolute full mode or a relative full mode. This is determined by an external programming pin which has first and second programming states associated with the two modes. In the absolute full mode, a Programmed Full Count (PFC) determines the upper capacity value of the display (34), which PFC is predetermined and represents the maximum capacity of the battery when the battery is new. The charge state value displayed is then determined relative to the maximum capacity value. In the relative full mode, the actual capacity of the battery is determined and defines the upper capacity value of the display (34). A translation device (186) is operable to vary the output of the NAC register (180) as a function of temperature, this changed in discrete steps.
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Citations
15 Claims
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1. A display system for a battery monitoring system having a battery that has a rated maximum capacity and an actual capacity, comprising:
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a battery monitoring circuit for determining the charge state of the battery and the actual capacity of the battery and representing the charge state of the battery with a charge state value and the actual capacity of the battery as an actual capacity value; a register for storing a user programmed rated maximum capacity value representing the rated maximum capacity of the battery as defined by the user; a display element for displaying the charge state of the battery which ranges from a lower capacity value to an upper capacity value; and a display controller for operating said display element in either an absolute full mode or in a relative full mode, said display controller when operating in said absolute full mode operable to set said upper capacity value to said maximum capacity value stored in said register and to display the charge state value in said display element as relative to said maximum capacity value, said display controller when operating in said relative full mode operable to set said upper capacity value to the actual capacity and to display in said display element the charge state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for displaying the charge state of a battery that has a rated maximum capacity and an actual capacity, comprising the steps of:
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determining the charge state of the battery and the actual capacity of the battery and representing the charge state of the battery as a charge state value and representing the actual capacity of the battery as an actual capacity value; storing a user programmed rated maximum capacity value representing the capacity of the battery when new in a register as defined by the user; providing a display element; displaying the determined charge state value on the display element ranging from a lower capacity value to an upper capacity value; operating the display element in either an absolute full mode or a relative full mode; when operating in the absolute full mode, the upper capacity value of the display element is set to the maximum capacity value stored in the register and displaying the charge state value is displayed as a value relative to the maximum capacity value; and when operating the display element in the relative full mode, the upper capacity value is set to the determined actual capacity the charge state value is displayed as a value relative to the determined actual capacity value. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification