Automatic control system for a rechargeable battery system
First Claim
1. An automatic battery control system comprising:
- a) a battery unit;
b) a microprocessor;
c) a battery management system that measures a state of charge of said battery unit and comprises;
i) an over-voltage output that provides an over-voltage signal to said microprocessor when the battery unit has a measured state of charge greater than an upper threshold limit;
ii) an under-voltage output that provides an under-voltage signal to said microprocessor when the battery unit has a measured state of charge less than a lower threshold limit; and
iii) a current flow output that provides a current signal of current flow direction into or out of said battery to said microprocessor;
d) an automatic battery control circuit coupled to the battery management system, the microprocessor and the battery unit and comprising;
i) a relay comprising;
a single relay contactor extending from an input side to an output side;
a transistor; and
ii) a parallel resistor configured in parallel with the relay contactor from said input side to said output side;
iii) a discharge optocoupler coupled between the automatic battery control circuit and the microprocessor;
iv) a charge optocoupler coupled between the automatic battery control circuit and the microprocessor;
v) a difference amplifier that senses a relay potential that is a voltage potential across the parallel resistor and communicates with the discharge optocoupler and charge optocoupler;
wherein the discharge optocoupler sends a signal to the microprocessor when the relay potential from the inlet to outlet side is positive;
wherein the charge optocoupler sends a signal to the microprocessor when the relay potential from the inlet to outlet side is negative;
wherein with the relay contactor open, a reduction in an output side voltage of the output side is indicated by the discharge optocoupler to the microprocessor, and when the battery is above a threshold discharge limit, the relay contactor is closed by said transistor and the battery unit is connected to a load and place the automatic battery control system in a discharge mode; and
wherein with the relay contactor open, an increase in the output side voltage of the output side is indicated by the charge optocoupler to the microprocessor, and when the battery is below a threshold charge limit, the relay contactor is closed by said transistor to connect the battery unit to a charging power source to place the automatic battery control system in a charge mode.
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Accused Products
Abstract
An automatic battery control system automatically switches from charge to discharge modes with a single relay, thereby preventing the need to manually reset a relay switch due to an over or under voltage situation. An automatic battery control circuit is coupled with a battery management system and a relay contactor is opened and closed by a signal from the battery management system. The battery management system monitors a state of charge of the battery unit as well as current flow to and from a battery unit. A parallel resistor is configured across the input and output sides of the single relay contactor and the voltage drop across the resistor indicates a connection to either a charging power source or a load. The connection is communicated to the battery management system by an optocoupler and if the battery unit has an acceptable state of charge, the relay contactor is closed.
28 Citations
16 Claims
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1. An automatic battery control system comprising:
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a) a battery unit; b) a microprocessor; c) a battery management system that measures a state of charge of said battery unit and comprises; i) an over-voltage output that provides an over-voltage signal to said microprocessor when the battery unit has a measured state of charge greater than an upper threshold limit; ii) an under-voltage output that provides an under-voltage signal to said microprocessor when the battery unit has a measured state of charge less than a lower threshold limit; and iii) a current flow output that provides a current signal of current flow direction into or out of said battery to said microprocessor; d) an automatic battery control circuit coupled to the battery management system, the microprocessor and the battery unit and comprising; i) a relay comprising; a single relay contactor extending from an input side to an output side; a transistor; and ii) a parallel resistor configured in parallel with the relay contactor from said input side to said output side; iii) a discharge optocoupler coupled between the automatic battery control circuit and the microprocessor; iv) a charge optocoupler coupled between the automatic battery control circuit and the microprocessor; v) a difference amplifier that senses a relay potential that is a voltage potential across the parallel resistor and communicates with the discharge optocoupler and charge optocoupler; wherein the discharge optocoupler sends a signal to the microprocessor when the relay potential from the inlet to outlet side is positive; wherein the charge optocoupler sends a signal to the microprocessor when the relay potential from the inlet to outlet side is negative; wherein with the relay contactor open, a reduction in an output side voltage of the output side is indicated by the discharge optocoupler to the microprocessor, and when the battery is above a threshold discharge limit, the relay contactor is closed by said transistor and the battery unit is connected to a load and place the automatic battery control system in a discharge mode; and wherein with the relay contactor open, an increase in the output side voltage of the output side is indicated by the charge optocoupler to the microprocessor, and when the battery is below a threshold charge limit, the relay contactor is closed by said transistor to connect the battery unit to a charging power source to place the automatic battery control system in a charge mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An automatic battery control system comprising:
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a) a battery unit; b) a microprocessor; c) a battery management system that measures a state of charge of said battery unit and comprises; i) an over-voltage output that provides an over-voltage signal to said microprocessor when the battery unit has a measured state of charge greater than an upper threshold limit; ii) an under-voltage output that provides an under-voltage signal to said microprocessor when the battery unit has a measured state of charge less than a lower threshold limit; and iii) a current flow output that provides a current signal of current flow direction into or out of said battery to said microprocessor; d) an automatic battery control circuit coupled to the battery management system, the microprocessor and the battery unit and comprising; i) a relay comprising; a single relay contactor extending from an input side to an output side; a transistor; and ii) a parallel resistor configured in parallel with the relay contactor from said input side to said output side; iii) a discharge optocoupler coupled between the automatic battery control circuit and the microprocessor; iv) a charge optocoupler coupled between the automatic battery control circuit and the microprocessor; v) a difference amplifier that senses a relay potential that is a voltage potential across the parallel resistor; wherein with the relay contactor open, a reduction in an output side voltage of the output side is indicated by the discharge optocoupler to the microprocessor, and when the battery is above a threshold discharge limit, the relay contactor is closed by said transistor and the battery unit is connected to a load and place the automatic battery control system in a discharge mode; and wherein with the relay contactor open, an increase in the output side voltage of the output side is indicated by the charge optocoupler to the microprocessor, and when the battery is below a threshold charge limit, the relay contactor is closed by said transistor to connect the battery unit to the charging power source to place the automatic battery control system in a charge mode wherein when in said discharge mode and when no under-voltage signal is received by the microprocessor from the under-voltage output the relay contactor remains closed and the relay potential will be substantially zero, and the output of the discharge optocoupler will turn off preventing said over-voltage signal from causing the relay to be opened; wherein the relay will remain closed as long as the current flow output provides a current signal of a current flowing to the load; and wherein when said current signal of a current flowing to the load from the battery unit stops, the microprocessor will open the relay contactor thereby isolating the battery unit from the load; wherein when in said charge mode and when no over-voltage signal is received by the microprocessor from the over-voltage output, the relay contactor remains closed and the relay potential will be substantially zero, and the output of charge optocoupler will turn off preventing any under-voltage signals from causing the relay to be opened; and wherein the relay will remain closed as long as the current flow output provides a current signal of a current flowing to the battery unit; and wherein when said current signal of a current flowing to the battery unit stops, the microprocessor will open the relay contactor thereby isolating the battery unit from the charging power source. - View Dependent Claims (15, 16)
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Specification