A new mixed-mode programming in PWM controllers

Ioannidis, GC; Charokopos, G; Marabeas, P; Manias, SN

dc.contributor.author	Ioannidis, GC	en
dc.contributor.author	Charokopos, G	en
dc.contributor.author	Marabeas, P	en
dc.contributor.author	Manias, SN	en
dc.date.accessioned	2014-03-01T02:45:03Z
dc.date.available	2014-03-01T02:45:03Z
dc.date.issued	2008	en
dc.identifier.issn	02759306	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32114
dc.subject	Harmonic Oscillator	en
dc.subject	Mixed Mode	en
dc.subject	Sampling Effect	en
dc.subject	Theoretical Analysis	en
dc.subject	Current Mode	en
dc.subject	Transfer Function	en
dc.subject	Turn Off	en
dc.subject.other	Bode diagrams	en
dc.subject.other	Counting circuits	en
dc.subject.other	Electric converters	en
dc.subject.other	Electric network analysis	en
dc.subject.other	Power converters	en
dc.subject.other	Pulse modulation	en
dc.subject.other	Pulse width modulation	en
dc.subject.other	Transfer functions	en
dc.subject.other	Clock signalling	en
dc.subject.other	Constant frequency	en
dc.subject.other	Control schemes	en
dc.subject.other	Control signalling	en
dc.subject.other	Error amplifier	en
dc.subject.other	Mixed modes	en
dc.subject.other	Output impedance	en
dc.subject.other	Output voltages	en
dc.subject.other	Peak current-mode control	en
dc.subject.other	Peak currents	en
dc.subject.other	PWM controllers	en
dc.subject.other	Ramp voltage	en
dc.subject.other	Sub-harmonic oscillations	en
dc.subject.other	Switch-on	en
dc.subject.other	Theoretical analysis	en
dc.subject.other	Turn-off	en
dc.subject.other	Power electronics	en
dc.title	A new mixed-mode programming in PWM controllers	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/PESC.2008.4591980	en
heal.identifier.secondary	http://dx.doi.org/10.1109/PESC.2008.4591980	en
heal.identifier.secondary	4591980	en
heal.publicationDate	2008	en
heal.abstract	In this paper a new mixed (voltage and current)-mode programming PWM controller is presented. The proposed controller compares a control signal to the error amplifier signal in order to command the switch to turn off, while a constant frequency clock signal is utilized to turn the switch on. In the case of peak current-mode controller, the control signal is a combination of inductor or most often switch current and a suitable compensation ramp which in the most common applications is constant. In the proposed controller, the constant compensation ramp has been replaced by a ramp voltage which is derived, charging an appropriate RC circuit from the output voltage of the converter. The output impedance and audio susceptibility transfer functions have been plotted and presented for both controllers revealing the improved behavior of the mixed-mode controller. Furthermore, like in peak current-mode control, sub-harmonic oscillations inherent to these control schemes, are predicted and avoided using an appropriate condition and extended validity Bode diagrams taking into consideration the well known sampling effect. To verify the theoretical analysis and conclusions, the two control schemes have been simulated considering step load and reference changes. ©2008 IEEE.	en
heal.journalName	PESC Record - IEEE Annual Power Electronics Specialists Conference	en
dc.identifier.doi	10.1109/PESC.2008.4591980	en
dc.identifier.spage	510	en
dc.identifier.epage	515	en