Switch-Mode Power Converter Noise Isolation for Sensitive Measurement Circuits
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Solution Overview
Problem
Electrical noise and interference from power supplies, particularly switch-mode power converters, significantly affect the accuracy of sensitive measurement circuits, making precise measurements unreliable.
Innovation Solution
A system that uses a switch-mode power converter coupled with an energy storage device, where the converter charges the device during active mode and powers off during measurement mode, allowing the energy storage device to supply power to the measurement circuit, thereby reducing noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch-mode power converter is used to power the measurement circuit, then the measurement circuit can be powered with appropriate voltages and ground isolation can be provided, but the switch-mode power converter introduces significant noise into the measurement system affecting measurement accuracy
Solution Approach 1:
The power supply system is segmented into two independent parts: a switch-mode power converter for power conversion and an energy storage device for measurement power supply. The converter charges the energy storage device during active mode, then the converter is powered off and the energy storage device powers the measurement circuit during measurement mode, eliminating noise while maintaining power supply reliability
Solution Approach 2:
The energy storage device is charged in advance by the switch-mode power converter before the measurement process begins. This preliminary charging action stores sufficient energy to power the measurement circuit during the entire measurement sequence, allowing the converter to be turned off and eliminating noise during measurements
2Power
If a main power supply is used to power the measurement circuit, then the measurement circuit can be powered, but long electrical wires for electrically coupling the measurement circuit to the main power supply introduce interference into the system
Solution Approach 1:
The energy storage device is extracted from the power supply system to create a local power source at the measurement circuit. This eliminates the need for long electrical wires connecting the measurement circuit to the main power supply, thereby removing the source of electrical interference while maintaining adequate power delivery
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces noise and electromagnetic interference, enabling more accurate and reliable measurements in sensitive measurement circuits by isolating the measurement process from the inherently noisy power converter.
Implementation Method 1
a first energy storage device operable to store a finite amount of electrical energy sufficient to temporarily power the measurement circuit
Data Source
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AI summary
The present invention is a system and method for temporarily storing electrical energy to power sensitive measurement circuits. In one embodiment, a switch-mode power converter is operable to charge an energy storage device. After the energy storage device is sufficiently charged, the switch-mode power converter is powered off so that sensitive measurements may be made without being affected by noise or interference caused by the switch-mode power converter. Once the measurement has been made, the switch-mode power converter is powered on and provides power to the energy storage device to recharge the energy storage device so that a subsequent measurement may be made.