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This paper proposes dynamic ramp control in current-mode adaptive on-time control for Buck converter on chip. It improves system stability and reduces output voltage at the load release. The concept of dynamic ramp control uses sample and hold circuit, comparator, and ramp valley control circuit adjusted according to the varied ramp signal to avoid the generation of an error pulse signal to regulate...
Power sharing performance is a critical issue of hybrid energy storage system (HESS) in autonomous DC microgrid (MG). In this paper, a novel integral droop (ID) is proposed to mimic dynamic characteristics of the capacitor by using energy storages (ESs) with quick response. The main advantage of the proposed controller is that dynamic power sharing among ESs is automatically realized in the decentralized...
In this paper, a simple THD improving method for a CCM boost PFC converter is proposed. Due to its small inductor current ripple, small conduction loss, and small input filter, the conventional CCM boost PFC converter is widely used in medium to high power applications. But, although it is designed to operate with CCM, it starts to operate with DCM in light load condition. This mode is called the...
This paper presents a novel boost converter with a proposed tapped inductor ripple cancellation circuit. Based on the traditional methods, an extra LC branch, which consists of a capacitor and an inductor, is introduced in order to diminish the input current ripple. At the same time, the main inductor in the traditional boost converter can be transferred into the tapped inductor with the LC branch...
We developed a gate driver IC that can power IGBTs of up to 500 amperes for HEVs and EVs. A newly developed Zener clamping circuit effectively suppressed the IGBT spike voltage in short circuit (SC) mode. The silicon-on-insulator (SOI) process was utilized to achieve high temperature operation and high surge protection.
Continuous conduction mode (CCM) boost power factor corrector (PFC) is widely used for high power applications such as server power supply. PFC performs AC/DC conversion with nearly unity power factor (PF) and low current harmonic distortion. However, the electromagnetic interference filter capacitors in front of the bridge diode and input filter capacitor behind the bridge diode incur phase leading...
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