Abstract
This paper introduces a control algorithm for soft-switching series LC converters. The conventional voltage-to-voltage controller is split into a master and a slave controller. The master controller implements constant current, constant voltage (CCCV) control, required for demanding applications, for example, lithium battery charging or laboratory power supplies. It defines the set-current for the open-loop current slave controller, which generates the pulse width modulation (PWM) parameters. The power supply achieves fast large-signal responses, e.g., from 5 V to 24 V , where 95% of the target value is reached in less than 400 s . The design is evaluated extensively in simulation and on a prototype. A match between simulation and measurement is achieved.
Highlights
The topology is similar to a series resonant converter, but it operates in a non-resonant push–pull mode [1]
{1} The master voltage controller sets the current to the slave current controller. {2} the slave current mode controller is an open-loop control transfer function based on (1)
At t < 0, the converter operated in Constant Current (CC) mode as the output current was limited to 2 A, while the slave controller operated in duty cycle modulation
Summary
By the use of soft-switching converters, highly efficient DC/DC converters can be built. The topology is similar to a series resonant converter, but it operates in a non-resonant push–pull mode [1]. In contrast to a dual active half-bridge converter, the two secondary side active output switches are replaced with diodes [2]. A detailed time domain analysis for calculating the SLC output current, operated above the LC resonance frequency, was published recently [1]. Current literature proposes a voltage-to-voltage transfer function [3,4]. A master controller sets the SLC output current, while a slave open-loop transfer function controls the switching period, duty cycle, and pulse-skipping. By the use of current mode control, one pole is eliminated in the control loop [6].
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