Electronic Pneumatic Pressure Controller With Constant Current Source
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Solution Overview
Problem
Current pressure regulatory systems electronically controlling pressure regulators constantly bleed air to atmosphere due to the lack of a constant current source for pressure transducers, which is not zero-balanced, and fail to correct for small pressure drops and supply line expansion.
Innovation Solution
A pressure regulator system with a control circuitry that includes a constant current source, a pressure transducer, and valves, allowing for remote electronic adjustment and correction of pressure by using a dual operational amplifier and a zero-balanced pressure transducer to control the exhaust valve proportionally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current electronic pressure control systems are used without a constant current source, then the system structure is simpler, but air constantly bleeds to atmosphere and pressure control precision deteriorates
Solution Approach 1:
A constant current source is introduced as an intermediary component between the power supply and the pressure transducer. This constant current source ensures stable current supply to the transducer, enabling zero-balanced operation and preventing air bleeding to atmosphere, thereby resolving the contradiction between system simplicity and pressure control precision.
Solution Approach 2:
The pressure transducer is configured to be self-balancing through the constant current source, automatically maintaining zero balance without requiring external manual adjustment. This self-service mechanism ensures continuous accurate pressure control while preventing air leakage, addressing the reliability issue without significantly increasing operational complexity.
2Device complexity
If manual or mechanical adjustment methods are used, then the device complexity is lower, but the ability to correct small pressure drops and supply line expansion is insufficient
Solution Approach 1:
The patent replaces manual or mechanical adjustment mechanisms with an electronic control system comprising a constant current source, pressure transducer, and control circuitry. This electronic substitution enables precise detection and correction of small pressure drops and supply line expansion effects, significantly improving measurement precision while maintaining acceptable device complexity.
Solution Approach 2:
A feedback control loop is implemented where the pressure transducer continuously monitors the actual pressure, compares it with the setpoint, and the control circuitry adjusts the pressure control valve accordingly. This feedback mechanism enables automatic correction of small pressure deviations and compensation for supply line expansion, achieving high precision pressure control.
3Ease of manufacture
If pressure transducer without zero balance is used, then the system is easier to manufacture, but air must be constantly bled to atmosphere
Solution Approach 1:
A constant current source is introduced as an intermediary component between the power supply and the pressure transducer. This constant current source ensures stable current supply to the transducer, enabling zero-balanced operation and preventing air bleeding to atmosphere, thereby resolving the contradiction between system simplicity and pressure control precision.
Solution Approach 2:
The electrical parameters supplied to the pressure transducer are changed from variable/voltage-based control to constant current control. This parameter change enables the transducer to operate in a zero-balanced state, eliminating the need for continuous air bleeding while maintaining ease of manufacture through standard electronic components.
Data Source
AI summary
An electronic device for controlling pressure regulators, enabling remote adjustments and corrections for pressure drops and supply line expansion is provided.