Microprocessor Pump Controller Reducing Switching Wear
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Solution Overview
Problem
Existing sump pump control units with float switches have limited lifetimes due to pump motor turn on/turn off currents and are inconvenient for setting liquid on-off levels, leading to premature failure and inefficiency.
Innovation Solution
A microprocessor-controlled pump controller using digital water level sensors and a combination of solid state switching devices and relays to accurately monitor and manage water levels, reducing electrical noise and extending the life of switching components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If float switches are used to control pump operation, then pump activation is achieved, but the switching components have limited lifetime due to motor turn on/turn off currents
Solution Approach 1:
The patent introduces a control unit as an intermediary between the float switch and the pump motor. This control unit processes the float switch signal and controls the pump motor operation, isolating the float switch from direct exposure to high motor currents. The control unit can implement soft starting, current limiting, or other current management techniques that protect the switching components while still achieving reliable pump activation based on float switch positioning.
Solution Approach 2:
The patent replaces direct mechanical/electrical switching by float contacts with electronic control through a microprocessor-based control unit. Instead of the float switch directly opening/closing the pump circuit, it sends a signal to the control unit, which then manages the pump motor activation. This substitution eliminates the harmful direct current exposure of mechanical switch contacts to high motor inrush currents, significantly extending switching component lifetime.
2Ease of operation
If float switches are used for pump control, then pump activation is achieved, but setting liquid on-off levels is inconvenient
Solution Approach 1:
The patent implements dynamic, software-based liquid level control through the control unit. Instead of fixed physical float positions, the system allows liquid on-off levels to be dynamically adjusted via programmable parameters in the control unit. Users can modify activation and deactivation levels through software settings, making the system adaptable to different operating conditions without physical reconfiguration. This dynamic control significantly improves ease of operation while maintaining system functionality.
3Device complexity
If multiple pumps are controlled from a single circuit, then installation complexity is reduced, but pump control accuracy must be maintained
Solution Approach 1:
The patent applies segmentation by providing separate control outputs for multiple pumps within the single control unit. Each pump receives dedicated control signals based on specific water level thresholds programmed into the control unit. The control unit segments the control logic so that Pump 1 activates at Level 1 and Pump 2 activates at Level 2, allowing precise individual pump control even though both share the same control unit and power circuit. This maintains measurement precision while simplifying overall installation.
Data Source
AI summary
A pump control system includes a controller coupled to first and second pressure sensors. The sensors couple serial pressure related information to the controller. The controller can evaluate respective liquid levels, in response to received pressure related information from the sensors. A current sensor coupled to the controller can provide signals indicative of operation of one or more pumps coupled to the controller. The controller includes circuits to detect the presence of predetermined faults and to emit an audible fault indicator in response thereto.