A New Approach to the Discontinuous Conduction Mode in Switching Power Converters

2010 ◽  
Vol 47 (2) ◽  
pp. 168-173
Author(s):  
Predrag Pejović
Keyword(s):  
Output Voltage ◽  
Teaching Practice ◽  
Power Converters ◽  
Teaching Method ◽  
Switching Converters ◽  
Output Current ◽  
Switching Power ◽  
Discontinuous Conduction Mode ◽  
Switching Power Converters ◽  
Conduction Mode

The discontinuous conduction mode in switching power converters is addressed in the paper. Instead of assuming that the load is a linear resistor, an equation is derived that relates the output current to the output voltage and other circuit parameters. Closed-form expressions that relate the output current to the output voltage and the other circuit parameters are obtained for all three of the basic switching converters: buck, boost, and buck–boost. The results obtained apply regardless the load type. To simplify notation, normalization of the output current and the output voltage is introduced. The proposed teaching method has been verified in teaching practice.

scholarly journals AC-DC PFC Converter Using Combination of Flyback Converter and Full-bridge DC-DC Converter

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Moh. Zaenal Efendi ◽  
Abdul Rizal ◽  
Aldi Erzanuari ◽  
Suryono . ◽  
Novie Ayub Windarko
Keyword(s):  
Power Factor ◽  
Output Voltage ◽  
Power Factor Correction ◽  
Output Current ◽  
Series Connection ◽  
Flyback Converter ◽  
Discontinuous Conduction Mode ◽  
In Series ◽  
Simulation And Experiment ◽  
Conduction Mode

This paper presents a combination of power factor correction converter using Flyback converter and Full-bridge dc-dc converter in series connection. Flyback converter is operated in discontinuous conduction mode so that it can serve as a power factor correction converter and meanwhile Full-bridge dc-dc converter is used for dc regulator. This converter system is designed to produce a 86 Volt of output voltage and 2 A of output current. Both simulation and experiment results show that the power factor of this converter achieves up to 0.99 and meets harmonic standard of IEC61000-3-2.Keywords: Flyback Converter, Full-bridge DC-DC Converter, Power Factor Correction.

INTERMITTENT CHAOTIC OPERATION IN SWITCHING POWER CONVERTERS

2004 ◽  
Vol 14 (08) ◽  
pp. 2971-2978 ◽  
Author(s):  
S. C. WONG ◽  
C. K. TSE ◽  
K. C. TAM
Keyword(s):  
Power Converters ◽  
Current Mode ◽  
Switching Converters ◽  
Current Sensing ◽  
Coupling Process ◽  
Switching Power ◽  
Controlled Switching ◽  
Switching Power Converters ◽  
Intermittent Chaos ◽  
Spurious Signals

In the process of designing and constructing switching power converters, chaotic operations are often observed intermittently between long periods of regular operations. In practice, such intermittent chaotic operations can be eliminated by incorporating appropriate design measures to combat interference of spurious signals. In this paper, we explain the mechanism that causes "intermittent" chaos in a popular type of switching converters, namely, current-mode controlled switching converters. The circuit model used to study the phenomenon incorporates a coupling process through which a spurious signal is coupled to the current sensing and ramp compensation circuitry, resulting in a modulation of the compensation slope which causes the system to become unstable intermittently. We show that coupling of spurious signals into the compensation ramp can cause intermittent chaotic or subharmonic operations.

Sign in / Sign up

Export Citation Format

Share Document