Gate Driver Thermal Compensation for Accurate Phase Current Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multi-phase switched mode power supplies (SMPS) face challenges in maintaining accurate feedback control due to temperature variations, which affect the accuracy of phase current measurements, often requiring complex communication and additional components.
Innovation Solution
A driver for SMPS is designed with integrated temperature sensing and phase-current sensing circuits that compensate for temperature variations, allowing for accurate phase current measurements by directly coupling a temperature sensor to the driver or receiving external temperature signals, and adjusting phase-current sensors with digital temperature signals to generate temperature-compensated sensed currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensing and current sensing are implemented separately with complex communication protocols, then temperature monitoring capability is improved, but device complexity increases
Solution Approach 1:
The patent combines temperature sensing and current sensing functions into a single integrated driver circuit. The temperature sensor is directly coupled to the driver, and the driver integrates both temperature monitoring and phase current sensing capabilities, eliminating the need for separate communication protocols and reducing overall system complexity while maintaining reliable temperature monitoring
2Measurement precision
If multiple separate sensors and communication interfaces are used for temperature and current sensing, then sensing accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The driver integrates multiple sensing functions (temperature sensing and phase current sensing) into a single device, reducing the total component count and manufacturing cost while maintaining measurement precision through dedicated sensing circuits within the integrated driver
Solution Approach 2:
The driver serves multiple functions simultaneously: it drives the power switches, monitors temperature through a directly coupled sensor, and senses phase current through integrated current sensing circuits, making it a universal component that reduces overall system cost
3Device complexity
If temperature compensation is not implemented, then device simplicity is maintained, but feedback accuracy deteriorates under temperature variations
Solution Approach 1:
The driver implements temperature compensation by using feedback from the temperature sensor to adjust the current sensing measurements. The driver compensates for temperature-induced variations in the sense resistor and other components, maintaining accurate feedback control across varying temperature conditions
Solution Approach 2:
The driver changes operational parameters based on temperature conditions by using the temperature sensor output to adjust current sensing measurements, compensating for temperature drift in resistive elements and maintaining measurement accuracy across the operating temperature range
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 enhances feedback accuracy and reduces complexity by minimizing the need for expensive components and intricate communication, resulting in a smaller, more efficient SMPS with improved performance across varying temperatures.
Implementation Method 1
a temperature sensing circuit that is configured to detect a temperature sensor at an input to the driver and based on the detection operate in a master mode or a slave mode
Implementation Method 2
Each phase-current sensor circuit is configured by the digital temperature signal to generate a temperature-compensated sensed current corresponding to a phase current output by the phase
Data Source
AI summary
A driver can be configured to provide sensed phase currents as feedback to a controller to indicate the output currents from each phase of a switch mode power supply (SMPS). The driver can be configured to temperature compensate the sensed currents in one of two ways. If a temperature sensor is directly coupled to the driver, then the driver may be configured to temperature compensate the sensed currents from each phase based on a temperature measurement made by the temperature sensor. If a temperature sensor is not directly coupled to the driver, then the driver may be configured to temperature compensate the sensed current from each phase based on a temperature signal received from a bus coupled to the driver. The bus can communicate the temperature signal so that multiple drivers can utilize one temperature sensor.