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This paper presents a new digital control method for a buck-boost converter. This new autotuning digital control is composed of “changing gain” and “changing bias”. The changing gain improves the transient response and the changing bias eliminates the steady state error. In the proposed method, the gain of FIR filter changes automatically along with the phase margin. The bias value also changes depending...
This paper presents a performance characteristic of a novel fast digital control dc-dc converter. It is able to detect the peak point of the reactor current at real time. The proposed circuit configuration is very easy. It is composed of a very low cost Voltage Controlled Oscillator (VCO), the programmable delay circuit and a few flip-flops. It is confirmed the main switch is turned off when the peak...
The purpose of this paper is to present a digitally controlled dc-dc converter with a novel peak current injected technique. In the proposed method, the peak current is able to be detected by using a voltage controlled oscillator (VCO) which is very low cost and the simple delay circuit implemented by the a field programmable gate array (FPGA). As a result, it is confirmed the main switch is turned...
The purpose of this paper is to present a novel digital peak-current detector and the dynamic characteristics of the current mode dc-dc converter using proposed one. The proposed circuit is able to detect the peak point of the switch/reactor current in real time only by comparing two pulse trains. The circuit principle is very simple. The peak point of the switch/reactor current is realized using...
The purpose of this paper is to present the dynamic characteristics of the new high performance auto-tuning digital control circuit for buck-boost converter when the step change of the load resistance R from 20 Ω to 10Ω. The buck-boost dc-dc converter is used with wide input voltage changing. At the same time, the suitable proportional gain and bias value are changing against the input voltage and...
The purpose of this paper is to present a new peak-current injected digital control circuit for dc-dc converter and its dynamic characteristics. The proposed circuit is able to detect the peak point of the switch current in real time only by comparing two pulse trains. At the moment when the peak switch current is detected, the proposed circuit generates the turn off signal of the main switch. The...
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