Photoionization Detector Lamp Voltage Supply Circuit
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Solution Overview
Problem
Existing methods fail to effectively convert low direct current (DC) voltage to high alternating current (AC) voltage for photoionization detector lamps, leading to turn-on failures and reading errors due to voltage drift caused by temperature fluctuations and component property variations.
Innovation Solution
A system comprising DC/DC converter circuitry, DC/AC converting circuitry, and feedback circuitry is used to convert low DC voltage to high AC voltage for photoionization detector lamps, with the feedback circuitry adjusting the DC/DC converter output based on reference AC voltage to maintain a stable AC supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If low DC voltage is converted to high AC voltage using conventional methods, then voltage transformation is achieved, but voltage drift occurs due to temperature fluctuations and component property variations
Solution Approach 1:
The patent implements a feedback circuit that samples the output AC voltage, rectifies it to DC, and feeds it back to the control circuit. The control circuit compares the feedback voltage with a reference voltage and adjusts the switching duty cycle accordingly to maintain stable output voltage despite temperature variations and component drift.
Solution Approach 2:
The patent changes the operating parameters of the switching circuit by adjusting the duty cycle of the PWM signal based on feedback. This dynamic parameter adjustment allows the system to compensate for temperature-induced drift and maintain consistent voltage transformation performance across different operating conditions.
2Reliability
If multiple separate power sources are used for photoionization detector components, then each component receives appropriate power, but device complexity increases
Solution Approach 1:
The patent merges multiple power supply functions into a single integrated circuit that performs DC-DC conversion, DC-AC inversion, and voltage regulation. This unified power management architecture eliminates the need for separate power sources for the detector lamp and other components, reducing system complexity while maintaining reliable power delivery.
Solution Approach 2:
The patent designs a universal power management circuit that serves multiple functions: boosting low DC voltage to high voltage, inverting DC to AC for the detector lamp, and providing stable regulated power for other components. This multi-functional approach replaces multiple specialized power sources with a single versatile unit.
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 solution reduces the risk of turn-on failures and reading errors, providing a stable AC voltage supply to photoionization detector lamps, improving measurement accuracy and eliminating the need for separate power sources.
Implementation Method 1
the DC/DC converter may be electronically coupled to a direct current (DC) voltage source and convert an input DC voltage from the DC voltage source to a compensated DC voltage based at least in part on a feedback DC voltage
Implementation Method 2
the DC/AC converting circuitry may be electronically coupled to both the DC/DC converter circuitry and the photoionization detector lamp, and may convert the compensated DC voltage to the AC voltage supply for the photoionization detector lamp
Implementation Method 3
the DC/AC converting circuitry may comprise an oscillating circuit and a transformer circuit electronically coupled to each other
Implementation Method 4
the transformer circuit may be electronically coupled to the photoionization detector lamp. In some examples, the transformer circuit of the DC/AC converting circuitry may comprise a primary winding and a secondary winding
Implementation Method 5
the feedback circuitry may obtain a reference AC voltage associated with the AC voltage supply, and may convert the reference AC voltage to the feedback DC voltage for the DC/DC converter
Data Source
AI summary
Methods, apparatuses, and systems for providing an alternating current (AC) voltage supply for a photoionization detector lamp from a direct current (DC) voltage source are provided. An example apparatus may include a DC voltage to DC voltage (DC/DC) converter circuitry, and a feedback circuitry that is electronically coupled to the DC/DC converter circuitry and converts a reference AC voltage to a feedback DC voltage for the DC/DC converter circuitry. In some examples, the feedback circuitry may be electronically coupled to a DC voltage to AC voltage (DC/AC) converting circuitry to obtain the reference AC voltage.