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Constant-frequency and variable-frequency digital peak current control techniques are introduced in this paper. To overcome time delay problem of previous digital peak current (DPC) control in constant switch frequency, two new algorithms are proposed and studied. One is an improved digital peak current (IDPC) control algorithm in constant switch frequency and the other is a variable-frequency digital...
Improved digital peak voltage (IDPV) control algorithm of switching dc-dc converters with trailing-edge, leading-edge, leading-triangle and trailing-triangle pulse-width modulations are studied in the paper. The control laws of switching dc-dc converters with these different modulation methods are derived and compared with buck converter as an example. Small-signal analysis and comparison among different...
The subharmonic oscillation phenomenon of digital peak voltage (DPV) control buck converters with various modulation methods is investigated. Digital slope compensation (DSC) and digital reposition compensation (DRC) of duty ratio ac component are proposed to eliminate the subharmonic oscillation. DSC is similar to its corresponding analog slope compensation method, while DRC fully utilizes the flexibility...
Digital controller of switching dc-dc converter has many advantages over conventional analog controllers. However, time delay is an accompanying shortcoming of digital controller. This time delay will greatly degrade the transient performance of switching dc-dc converters. In this paper, an algorithm to overcome this time delay is proposed and studied. The transient performance of the proposed digital...
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