The Study Of TL ZVS Half-Bridge Current Double Based Voltage Regulator Module (VRM)

The low voltage and high current DC-DC converter VRM (Voltage Regulator Module) is the core component of a Distributed Power System(DPS), which is designed for the computer's CPU power supply. With the development of the microprocessor, it poses new challenges for VRM. New high-performance microprocessors require lower output voltage, higher output current, more frequent and rapid load transition, and also higher power density, higher efficiency. All these requirements make the 48 V input voltage of the isolated voltage regulator module a candidate of VRM.In the first part of this paper, the development procession and trend in the future of VRM are briefly reviewed. After the comparison and optimization of the topologies for 48 V input voltage, the topology of Three-Level ZVS Half-Bridge Current Doubler Rectifier Circuit is finally determined. Related technologies to this topology are then briefly introduced. Pspice simulation result is provided to prove the prior analysis.In the second part, by analyzing the working principle of Three-Level ZVS Half-Bridge Current Doubler Rectifier Circuit topology, the main topology is optimized further more. Pspice simulation of Three-Level ZVS Half-Bridge Current Doubler Rectifier Circuit is experienced in detail to prove the superiority of the circuit, and the control policy for the switches to achieve zero-voltage (Zero Voltage Switch) is analysed.Then in the next part, the parameters of the main circuit was designed. Pspice simulation of various control methods are compared to determine the more suitable control method V2 control. The implementation of the control method of the experimental is followed.Experimental results of Three-Level ZVS Half-Bridge Current Double Rectifier with 48 V-based input and 1 V/25 A output are provided in the final part. Synchronous Rectification, Three-Level, Self-Driven techniques are used in this experiment. A stable output of 1 V was achieved. Experimental results proved the theoretical analysis, and the feasibility of this VRM design was verified.