A Wide Input Range Buck-Boost DC–DC Converter Using Hysteresis Triple-Mode Control Technique with Peak Efficiency of 94.8% for RF Energy Harvesting Applications

Abstract

This paper presents a wide range buck-boost direct current to direct current (DC-DC) converter for wireless power transfer (WPT) systems. To implement the wide range DC-DC converter, a Hysteresis triple-mode selector is proposed and designed to effectively adjust the DC-DC converter to operate in one of the three modes: buck, boost or buck-boost, according to the input voltage level. Hysteresis control technique eliminates the unstable state at the mode transition. An output soft start-up circuit is proposed to reduce the inrush current in the switch transistor. A min-max duty generator is introduced to improve the accuracy of DC-DC converter. When the output voltage is too low or too high in comparison to the desired value. The min-max duty generator can control the DC component of the error signal to eliminate the unwanted dead state of the pulse width modulation signal. In addition, only one external inductor is shared between two power stages, thus minimizing the system cost by reducing the external components. The proposed buck-boost DC-DC converter is implemented using 180 nm Complementary Metal-Oxide-Semiconductor (CMOS) technology. The output voltage is regulated to 5 V when the input voltage ranges 3-8 V, and output load current ranges 100-500 mA. The die area is 1.55 mm × 1.14 mm (1.767 mm 2). The measured peak efficiency of the buck-boost DC-DC converter is 94.8%.

A Review on State-of-the-Art Power Converters: Bidirectional, Resonant, Multilevel Converters and Their Derivatives

“…The four-quadrant activity of this topology makes this topology generally adaptable. Despite this, it has some weaknesses, such as the use of a higher number of switches, which causes higher switching losses; it also relies on complex control algorithms and experiences additional operating losses due to the inverse diode recovery [38,46,47]. In ESSs, the cascaded buck-boost (CBB) converter is frequently utilized.…”

State-Feedback Control of Interleaved Buck–Boost DC–DC Power Converter with Continuous Input Current for Fuel Cell Energy Sources: Theoretical Design and Experimental Validation

“…Furthermore, the proposed topology of the Buck-Boost conver Indeed, the static (current-voltage) characteristic of PEMFC, shown in Figure 2, is nonlinear [6,7] and depends on the thermodynamically predicted fuel cell voltage output and the following three majors losses: activation losses (due to electrochemical reaction), ohmic losses (due to ionic electronic condition), and concentration losses (due to mass transport). Therefore, PEMFC systems need to use the DC-DC power converters to supply regulated and stable power to the different loads and equipment [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Classical DC-DC power converters of Boost and Buck converters are widely used in the fuel cell system [22][23][24][25].…”

A PWM/PFM Dual-Mode DC-DC Buck Converter with Load-Dependent Efficiency-Controllable Scheme for Multi-Purpose IoT Applications

“…The pulse width modulation (PWM) control method is still popular under heavyload conditions, which gives better EMI performance than the PFM. A disadvantage of the voltage-mode PWM control method [12,29] is its complicated compensation circuit design, but it has a simple feedback loop structure that utilizes a single voltage control loop with high noise immunity. An advantage of the current-mode PWM control method [30,31] is its fast transient response speed, but it requires one more current control loop.…”