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A method and circuit for pulse width modulation (PWM) control of a buck-boost DC-DC converter used in energy harvesting for powering ultra low power sensor systems from vibrations is presented. The impedance of the transducer, the environmental parameters where the system is deployed, and the load to be driven necessitate an adaptive DC-DC converter. The circuit used to control the gate of the switching...
In this paper, the general operation principles for the existing control type ZVT PWM dual switch forward converters which possess the same conversion ration are reviewed and their advantages and drawbacks are discussed in detail. Then the control type ZVS techniques of active-clamp and resonant reset are extended to the other dual switch forward converters by whether employing the input for resetting...
Based on Simulink tool, the high-level model of 2.0A/375 kHz current controlling PWM buck converter is presented adopting state vector averaging method. The high-level model is verified using Beiling 2??m/20V bipolar process and 30V/5.0A P-ch power MOSFET. The measured results show that the typical conversion efficiency can be over 90%, the maximum ripple value of output voltage is 32.8 mV, the output...
In this paper, a novel method based on chaotic dynamics and soft switching control is proposed for the reduction of the electromagnetic interference (EMI)in DC-DC converter. There, a chaotic carrier plays a key role to generate chaotic wave, but a practical design is not yet available in literature. Therefore, to design a chaotic carrier, a practical design based on a chaotic mapping and sawtooth...
Average switch models for both small signal and large signal performance of a phase-shifted full-bridge PWM (PS-FB-PWM) converter under charge control called charge-controlled ZVS-PWM switch (QC-ZVS-PWM) are developed in this paper. By substituting these models into cycle-by-cycle model of PS-FB-PWM converter the small signal and large signal behavior of the converter can be easily predicted. Implementation...
Based on the working conditions and development trend of operating mechanism of high-voltage circuit breaker, this paper presented a high-load adjustment rate of portable high-frequency switching power supply designed for high-voltage circuit breakers test. The main circuit topological structure is analysed in detail, which uses the fullbridge circuit and IGBTs (insulated gate bipolar transistor)...
Multilevel converters have excellent performance in power application, especially in high-power medium voltage fields. To find an effective and general strategy for multilevel and multiphase system is a challenge attracting many researchers. This paper analyses the basic analytical meaning of PWM strategy, which is to implement an analog continuous reference value by means of several available discrete...
Based on control type soft switching, an interleaved three-phase bidirectional DC/DC converter for high voltage high power applications is presented. The converter main circuit uses the interleaved three-phase bidirectional DC/DC topology and takes use of the three-phase complementary PWM control to implement soft switching condition. The circuit principles, the working modes and control type soft...
In this paper, a novel type of auxiliary switched capacitor assisted edge resonant soft switching PWM resonant DC-DC converter with two auxiliary edge resonant lossless inductor snubbers. The operation principle of this converter is described using the switching mode equivalent circuits. This newly developed multi resonant DC-DC converter can regulate its dc output AC power under a principle of constant...
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