Transient Response Of Dc-dc Converters Research Articles

Implementation of Neural Network and Bias Correction Controls for Fast Transient Response of DC-DC Converter

Implementation of Neural Network and Bias Correction Controls for Fast Transient Response of DC-DC Converter

Fast Load Transient Regulation of Low-Voltage Converters with the Low-Voltage Transient Processor

The transient response of DC-DC converters with large conversion ratios is limited by the asymmetry of the current slew rate through the magnetic elements; under appropriate control, such a converter may respond much faster to an increase in load current than a decrease, or vice versa. In this paper, a low-voltage, unloaded, bidirectional DC-DC converter with a very fast current slew rate, called the low-voltage transient processor (LVTP), is placed in shunt across the output of a conventional DC-DC converter (the ldquoprimary regulatorrdquo) to equalize the effective current slew rate (the combination of the LVTP and primary regulator) seen at the load, so that the transient response to a load increase is the same as the response to a load decrease. The LVTP operates at very low voltages, enabling the use of small magnetic components with low losses even at high-frequency operation, allowing the overall efficiency of the system to be high. To demonstrate the concept, a 3 MHz bidirectional buck LVTP prototype was implemented and placed at the output of a 12-1.2 V microprocessor voltage regulator (VR). The VR with LVTP matched the performance of VRD10.1 VR reference design with half (4.10 mF) of the output capacitance of the original design.

Dual-Current Pump Module for Transient Improvement of Step-Down DC–DC Converters

This paper presents a novel dual-current pump module (DCPM) to improve the transient response of dc-dc converters. The DCPM operates only during transient to provide two additional current injections for step-up load and current drains for step-down load. Due to the two current pump paths, the current stress on the switches of the DCPM is also reduced. The measurement results show that the DCPM can enhance the dynamic recovery time of the buck dc-dc converter by more than an order.

Fast Load Transient Regulation of Low Voltage Converters With the Low Voltage Transient Processor (LVTP)

The transient response of DC-DC converters with large conversion ratios is limited by the asymmetry of the current slew rate through the magnetic elements; under appropriate control, such a converter may respond much faster to an increase in load current than a decrease, or vice versa. In this paper, a low-voltage, unloaded, bidirectional DC-DC converter with a very fast current slew rate, called the low-voltage transient processor (LVTP), is placed in shunt across the output of a conventional DC-DC converter (the ldquoprimary regulatorrdquo) to equalize the effective current slew rate (the combination of the LVTP and primary regulator) seen at the load, so that the transient response to a load increase is the same as the response to a load decrease. The LVTP operates at very low voltages, enabling the use of small magnetic components with low losses even at high-frequency operation, allowing the overall efficiency of the system to be high. To demonstrate the concept, a 3 MHz bidirectional buck LVTP prototype was implemented and placed at the output of a 12-1.2 V microprocessor voltage regulator (VR). The VR with LVTP matched the performance of VRD10.1 VR reference design with half (4.10 mF) of the output capacitance of the original design.

High-performance error amplifier for fast transient DC-DC converters

A new error amplifier is presented for fast transient response of dc-dc converters. The amplifier has low quiescent current to achieve high power conversion efficiency, but it can supply sufficient current during large-signal operation. Two comparators detect large-signal variations, and turn on extra current supplier if necessary. The amount of extra current is well controlled, so that the system stability can be guaranteed in various operating conditions. The simulation results show that the new error amplifier achieves significant improvement in transient response than the conventional one.