Design And Implementation Of Four-quadrant DPS Module

Integrated circuit test is an essential process that spans the entire lifecycle of integrated circuits,from the design stage to the final product application.Automatic Test Equipment(ATE)for integrated circuits is the main instrument used for testing.The Device Power Supply(DPS)module,which supplies high-quality power to the devices being tested,is a critical function of ATE.With the flourishing development of integrated circuits and the diversity of devices being tested,the demand for power supply has become increasingly high,and higher requirements have been placed on the DPS module in terms of voltage-current quadrants,output voltage-current range,accuracy,and stability.The four-quadrant DPS module developed in this project requires the output of high voltage and high current,and solves problems such as precise control of voltage/current,and arbitrary quadrant output within the voltage/current four quadrants.The main research content of this project includes:1.Research and implementation of the four-quadrant principle: This study explores the basic components and characteristics of linear and switch-mode DC voltage regulators,as well as their respective advantages and disadvantages.In light of the fact that traditional voltage regulators can only operate in the first quadrant where both voltage and current are positive or in the third quadrant where both voltage and current are negative,the focus is on analyzing the principle of how switch-mode voltage regulators achieve four-quadrant functionality.A novel switch-mode power supply topology is selected to design the peripheral circuit and achieve four-quadrant functionality.As for linear voltage regulators,the feasibility of designing a two-quadrant and four-quadrant output circuit is achieved by utilizing the internal structure configuration of the linear voltage regulator chip.2.Module Output Precise Control: A dual-closed loop feedback control is used as the control algorithm,dividing the hardware circuit into a module internal controller,low voltage regulator circuit,wide voltage regulator circuit,and voltage-current acquisition circuit.The voltage-current acquisition uses a four-wire Kelvin measurement and multilevel range switching to improve accuracy.The module controller adopts a dual-core architecture of ARM+FPGA,which has an advantage over commonly used single-core ARM or single-core FPGA.The internal loop of the module is responsible for the initial output adjustment,while the external loop uses a fuzzy PID dual-mode control algorithm to achieve high precision and stability output.3.Multi-channel voltage and current wide-range output: By using switch-mode regulation to output high current at low voltage and linear regulation to output high voltage at low current,the power loss caused by linear regulation at high current and the large ripple of switch-mode regulation can be avoided.Two different models of DPS modules are designed for different scenarios,and a large amount of hardware circuitry is reused to reduce hardware resource consumption.The communication and interaction between the module and the application platform are optimized,and the software and hardware debugging of the module are completed,as well as the integration testing with the testing system.The setup of a testing platform for module testing and validation revealed that the four-quadrant DPS module developed in this project can operate in all four quadrants.The single-channel output voltage range is from-20 V to +20V,with a maximum output current of 2A.Multiple channels in parallel can achieve a wider range of current output.The output and measurement accuracy of the module meet the same standards as mainstream testing machines.Additionally,the module has overvoltage,overcurrent,and overtemperature protection functions,which meet the requirements of the power supply module for the integrated circuit testing system.