SiPM Bias Generator Using Dark-Current Feedback
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Solution Overview
Problem
Existing boost circuits for SiPMs are inefficient in providing the required bias voltage and current, often consume excessive power, and lack the ability to adjust for temperature changes, adding cost, power consumption, and size to the design.
Innovation Solution
A low-cost, high-efficiency bias generator system that includes a power source, controller, boost circuit, feedback circuit, and readout circuit, utilizing a low-power microcontroller and various boost topologies to efficiently generate and adjust the bias voltage for SiPMs, with integrated current measurement and mode switching capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If commercial boost ICs are used to generate SiPM bias voltage, then voltage boosting capability is provided, but power consumption increases and efficiency decreases
Solution Approach 1:
The system uses the SiPM's own dark current counts as feedback to automatically control the boost circuit operation. The microcontroller monitors dark current and adjusts boost circuit duty cycle accordingly, eliminating the need for external temperature sensors or additional control components while optimizing power efficiency.
Solution Approach 2:
The system implements a feedback mechanism where the microcontroller reads dark current counts from the SiPM and uses this information to control the boost circuit's switching duty cycle. This closed-loop control ensures the bias voltage is maintained at optimal levels while minimizing power consumption by adjusting the boost circuit operation based on actual SiPM requirements.
2Adaptability or versatility
If temperature compensation is implemented using additional components, then bias voltage adjustment capability is improved, but device complexity and cost increase
Solution Approach 1:
The microcontroller serves multiple functions: it controls the boost circuit switching, reads dark current counts from the SiPM, processes temperature compensation algorithms, and adjusts bias voltage accordingly. This multi-functional approach eliminates the need for separate temperature sensors, DACs, or digital potentiometers that would otherwise be required for temperature compensation.
Solution Approach 2:
The system uses the SiPM's inherent dark current characteristics as a built-in temperature indicator. By monitoring dark current counts, the system automatically detects temperature changes and adjusts bias voltage compensating for temperature effects without requiring external temperature sensing components.
3Power
If boost circuits are designed for higher current applications, then voltage boosting capability is provided, but efficiency decreases for low current SiPM operation
Solution Approach 1:
The boost circuit operates in a dynamic manner with its switching duty cycle continuously adjusted by the microcontroller based on SiPM requirements. The system transitions between different operating states (boosting, maintaining, or disabling the boost circuit) to match the actual power needs of the SiPM, optimizing efficiency for low-current operation while maintaining voltage boosting capability when needed.
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 system provides efficient voltage and current supply for SiPMs, reduces power consumption, and allows for temperature compensation without additional components, while offering flexible operating modes for different conditions, enhancing battery life in portable devices.
Implementation Method 1
boost circuit connected to the controller
Data Source
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AI summary
A switching mode power supply includes a microcontroller, an interface circuit connected to the controller, and a boost circuit connected to the controller. A feedback circuit is connected to the controller, and an SiPM is connected to the boost circuit and the feedback circuit.