Intrinsically Safe DC-DC Converter for Hazardous Location Battery Devices
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Solution Overview
Problem
Existing battery-powered electrical devices are not adequately suited for hazardous locations due to inefficiencies and bulkiness, and require multiple batteries to achieve the necessary voltage, leading to variations in light intensity and inefficient energy use.
Innovation Solution
An intrinsically safe device with a battery receiving region, energy limiter, and energy converter that converts energy from a single battery to a suitable voltage for powering the device, ensuring safety and efficiency in hazardous locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple batteries are connected in series to achieve necessary voltage, then the required voltage is achieved, but the device becomes bulkier and energy utilization becomes inefficient
Solution Approach 1:
The power supply system is segmented into a battery module and a separate DC-DC converter module. The converter module extracts and boosts voltage from a single battery, eliminating the need to connect multiple batteries in series. This segmentation allows the device to maintain compact size while achieving the necessary operating voltage through efficient energy conversion.
Solution Approach 2:
The DC-DC converter dynamically changes electrical parameters by boosting the voltage from a single battery to the required operating level. This parameter transformation allows the system to achieve high voltage output without requiring multiple high-voltage batteries, thereby reducing device volume while maintaining power requirements.
2Power
If multiple batteries are connected in series, then the necessary voltage is achieved, but light intensity varies significantly as batteries discharge
Solution Approach 1:
The DC-DC converter incorporates feedback control mechanisms that continuously monitor the battery voltage and adjust the conversion ratio accordingly. This feedback system maintains stable output voltage and current to the LED despite variations in battery discharge characteristics, ensuring consistent light intensity throughout the battery's operational life.
Solution Approach 2:
The converter dynamically adjusts electrical parameters during operation, transforming the unstable discharge characteristics of a single battery into stable output parameters. By changing the conversion ratio and controlling the energy transfer, the system maintains constant power delivery to the LED, eliminating light intensity variations.
3Reliability
If a series connection with energy limiting resistor is used, then intrinsic safety is achieved, but energy utilization from batteries becomes inefficient
Solution Approach 1:
The passive energy limiting resistor approach is replaced with an active DC-DC converter system. Instead of dissipating excess energy as heat through resistance, the converter actively manages energy flow, converting and transferring electrical energy efficiently from the battery to the load. This substitution maintains intrinsic safety through controlled energy transfer while dramatically improving energy utilization efficiency.
Solution Approach 2:
The system changes the energy management approach from passive resistance-based limiting to active conversion-based control. The DC-DC converter optimizes the transfer of electrical parameters (voltage, current, power) between battery and load, maximizing energy extraction from the battery while maintaining safe operating levels through controlled energy transfer rather than dissipation.
4Reliability
If explosion-proof housings are used, then safety in hazardous locations is achieved, but the device becomes expensive and physically large
Solution Approach 1:
The safety function is extracted from the mechanical housing structure and transferred to the electrical circuit design. Instead of relying on a bulky explosion-proof enclosure, the patent implements intrinsic safety at the circuit level through the DC-DC converter's controlled energy transfer mechanism. This extraction allows the use of standard, compact housings while maintaining safety through electrical design rather than mechanical protection.
Solution Approach 2:
The mechanical explosion-proof housing is replaced with an electrical intrinsic safety system. The DC-DC converter creates a inherently safe circuit that limits energy available for ignition, substituting the need for heavy-duty mechanical protection with an elegant electrical solution. This substitution dramatically reduces device size and cost while maintaining safety for hazardous location operation.
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
The solution provides a compact, efficient, and intrinsically safe battery-powered device capable of operating in hazardous locations with consistent performance and reduced battery requirements, addressing the inefficiencies and bulkiness of previous designs.
Implementation Method 1
a first boost converter which converts electrical energy from the at least a first battery to a voltage suitable for powering the first device electrical circuitry
Data Source
AI summary
An intrinsically safe battery powered device (100) includes a housing (102), a battery receiving region (104), an intrinsically safe power supply (108, 110), and device electrical circuitry (112). The power supply (108, 110) uses energy from batteries (106) received in the batter receiving region (104) of the device (100) to power the circuitry (112). In one implementation, the power supply includes an intrinsically safe charge pump circuit.