A Fast-Response Pseudo-PWM Buck Converter With PLL-Based Hysteresis Control

Stability analysis of the shunt regulator in PCU with describing function method

“…And the output of SR is the bus load, which is, paralleling with a bus capacitor C to maintain the bus voltage. The hysteresis control is realized by the hysteresis comparison [11,12], and its relationship between of the input x and the output f(x) is given in Fig.2, which is a hysteresis band for one power cell.…”

An Effect of Output Capacitor ESL on Hysteretic PLL Controlled Multiphase Buck Converter

“…Interleaving and phase-shedding techniques are pillars that help to improve efficiency and ripple cancellation effect. Several works have been recently focused on the hysteretic mode controlled SMPS (Switched-Mode Power Supply) converters [1][2][3][4][5][6]. This type of control grows in popularity for fast transient response.…”

“…Both approaches lead to switching frequency control. The switching frequency F SW (1c) mainly depends on control scheme and component parameters, for more details see [4], [11]. The only condition for controllable frequency is the peak to peak voltage value across the output capacitor ESL (Equivalent Series Inductance) does not exceed the comparator hystere- where BETA and GAMMA are gains of the voltage and current path respectively, V hyst is hysteresis of the comparator, I L(p-p) is inductor peak to peak current, ESR, ESL and C are components of the output capacitor RLC serial model, V C , V ESR , V ESL are voltage differences on the output capacitor model components between start and end of the on/off-state.…”

An improved hysteretic PWM control with feed-forward and feedback

“…It is known that hysteretic control has a fast transient response, the feedback delay of the control signal can be reduced to render fast response [4], and regulate the output voltage in response to step changes of loading current. It might take only one switching cycle to complete the same load transient response [2,3,5].…”