Overcurrent limiting characteristics of the DC-DC converter with a new digital current-injected control circuit

In this study, the development of an improved output feedback controller for the positive output (P/O) super-lift re-lift Luo converter is presented. The main feature of the proposed controller is that despite the non-minimum phase obstacle presented by the boost-type dc-dc converter, the output voltage is regulated directly. Moreover, the structure of the proposed controller is such that it is insensitive to the load variations and there is no risk of saturation in the control law due to division by zero. The stability analysis of the closed-loop controlled system is provided and the feasibility of the proposed controller is shown. The feasibility analysis shows that the 'remaining dynamics' for the controlled converter has only one equilibrium point which is always stable. Finally, some simulations as well as experimental results are also provided to illustrate the features of the proposed feedback control strategy.

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“…Using the set of circuit parameters given in (15), the corresponding characteristic polynomial is described by: (see (28))…”

Section: Stability Analysismentioning

confidence: 99%

Improved output feedback controller design for the super‐lift re‐lift Luo converter

Jiang

Chincholkar

Chan

2017

IET Power Electronics

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“…where the average duty-cycle command D is found by the moving-average low-pass filter L(z) according to (3) and (4). The minimum of the two duty-cycle commands, d = min{d v , d i } (12) is the duty-cycle command input to the digital pulse-width modulator (DPWM).…”

Section: B Overload Protection In Digital Voltage-mode Controllermentioning

confidence: 99%

“…uncontrollable build up of the inductor current [2]. Various auxiliary schemes have been proposed to mitigate the problem, such as: pulse dropping or decreasing the switching frequency [1][2][3][4][5]. The steady state current limiting is easier to accomplish using average current mode control [6,7].…”

Section: Introductionmentioning

confidence: 99%

Overload protection in digitally controlled DC-DC converters

Hao

Maksimović

2006

2006 37th IEEE Power Electronics Specialists Conference

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This paper presents an approach to overload protection based on a predictive average current-mode control technique for digitally controlled DC-DC switched-mode power supplies. The proposed approach can be applied in voltage-mode or current-mode control architectures. The current limit, the converter actions upon detecting an overload, and the shape of the overload characteristic can be fully programmable. Static and dynamic operation are discussed and the results are verified on a digitally controlled 6V to 1.8 V, 10 A, 200 KHz synchronous buck prototype.

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“…Such current measurement method is subject to disturbances that may arise when measuring instantaneous inductor-current signals. Only a few authors, [30] and [31], describe the average current measurement principles by using VCOs, but they did not realise the necessity of transferring the current reference values in the area space. However, disturbances can result in poor control and, thus, can distort the testing results.…”

Section: Introductionmentioning

confidence: 99%

Digital Control of an Interleaving Operated Buck-Boost Synchronous Converter Used in a Low-Cost Testing System for an Automotive Powertrain

2018

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Based on the standardization in the automotive industry, systems require extensive testing, which represents significant costs regarding personnel and equipment. The testing systems must be built in such a way that a bidirectional power flow is possible between the power source and the tested system. Additionally, applied testing systems have to possess high disturbance immunity. Classical current programmed control performed using an analogue approach suffers from low disturbance rejection during switching operation. The digital control of DC-DC converter can solve this problem with the use of digital integration in a measurement chain. The integrals of values are obtained by using a Voltage Control Oscillator (VCO) and appropriate counters. Digital control of an interleaving operated bidirectional buck-boost synchronous converter can be applied in the testing system for automotive powertrains. The voltage and current measurements with the application of an integral-measurement principle act as low-pass filters, which remove the disturbances from the measured values. The digital implementation of a compensation ramp (current mode control) and method for choice of control parameters are described. All the tasks for measurements, as well as current and voltage control, were implemented within the FPGA (Field Programmable Gate Array). The presented converter can operate as a close to ideal voltage or current source, and satisfies the requirements of testing electric motor drive-trains with bidirectional DC-AC converters that are applied in automotive applications. The proposed system was verified by simulation and experiments.

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Overcurrent limiting characteristics of the DC-DC converter with a new digital current-injected control circuit

Cited by 11 publications

References 4 publications

Improved output feedback controller design for the super‐lift re‐lift Luo converter

Improved output feedback controller design for the super‐lift re‐lift Luo converter

Overload protection in digitally controlled DC-DC converters

Digital Control of an Interleaving Operated Buck-Boost Synchronous Converter Used in a Low-Cost Testing System for an Automotive Powertrain

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