Device for controlling a pump in a storage battery
First Claim
1. In a system for controlling flow rates in a storage battery of the type having at least one pump driven at a controlled speed by a motor driven at a speed determined by the average applied voltage and the load experienced by the pump, said system including a circuit for applying an average voltage to said motor and means for generating a reference signal for controlling the general magnitude of said average applied voltage to drive said pump at a desired speed, the improvement comprising:
- means for supplying a main voltage level of a given magnitude;
means for alternately switching said main voltage level across said motor;
said switching means having a first condition with said voltage level applied across said motor and a second condition with said voltage level generally isolated from said motor; and
, signal generator means normally responsive to a voltage control signal controlled at least in part by said reference signal for creating a signal to change the relative time said switching means is in said first condition compared to the time said switching means is in said second condition.
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Accused Products
Abstract
In a system for controlling the flow rates in a storage battery of the type having at least one pump driven at a controlled speed by a motor driven at a speed determined by the average applied voltage and the load experienced by the pump, which system includes a circuit for applying an average voltage to the motor and means for generating a reference signal for controlling the general magnitude of the average applied voltage to drive the pump at the desired speed, there is provided an improvement. This improvement comprises means for supplying a main voltage level of a given magnitude, means for alternately switching the main voltage level across the pump driving motor wherein the switching means has a first condition with the voltage level applied across the motor and a second condition with the voltage level isolated from the motor, and signal generating means normally responsive to a voltage control signal controlled at least in part by the reference signal for creating a signal to change the relative time the switching means is in the first condition compared to the time the switching means is in the second condition.
24 Citations
28 Claims
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1. In a system for controlling flow rates in a storage battery of the type having at least one pump driven at a controlled speed by a motor driven at a speed determined by the average applied voltage and the load experienced by the pump, said system including a circuit for applying an average voltage to said motor and means for generating a reference signal for controlling the general magnitude of said average applied voltage to drive said pump at a desired speed, the improvement comprising:
- means for supplying a main voltage level of a given magnitude;
means for alternately switching said main voltage level across said motor;
said switching means having a first condition with said voltage level applied across said motor and a second condition with said voltage level generally isolated from said motor; and
, signal generator means normally responsive to a voltage control signal controlled at least in part by said reference signal for creating a signal to change the relative time said switching means is in said first condition compared to the time said switching means is in said second condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- means for supplying a main voltage level of a given magnitude;
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27. In a system for controlling flow rates in a storage battery of the type having at least one pump driven at a controlled speed by a motor driven at a speed determined by the average applied voltage and the load experienced by the pump, said system including:
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(a) a circuit for applying an average voltage to said motor; (b) means for generating a signal for controlling the general magnitude of said average applied voltage to drive said pump at a desired speed; the improvement comprising; (c) means for sensing the current flow in said motor; and
creating a current controlled signal representative of said motor current flow; and
,(d) means for controlling said signal generating means and thence said general magnitude of said average applied voltage by said current controlled signal when said current controlled signal exceeds a preselected value.
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28. In a system for controlling flow rates in a storage battery of the type having at least one pump driven at a controlled speed by a motor driven at a speed determined by the average applied voltage and the load experienced by the pump, said system including a circuit for applying an average voltage to said motor and means for generating a signal for controlling the general magnitude of said average applied voltage to drive said pump at a desired speed, the improvement comprising:
- means for creating a main supply voltage level for said motor, said supply means including means for providing a first fixed D.C. voltage level by an auxiliary source separate from said storage battery, means for providing a second D.C. voltage level by said storage battery and variable between a lower level and a higher generally fixed level and means for creating said main voltage level by said first voltage level until said second voltage level exceeds a given level.
Specification