Title :
Analysis and interpretation of loop gains of multiloop-controlled switching regulators (power supply circuits)
Author :
Ridley, Raymond B. ; Cho, Bo H. ; Lee, Fred C Y
Author_Institution :
Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Two different loop gains of power supplies with current-mode control are considered. Relationships between the different loop gains of the multiloop system and the closed-loop measures of output impedance and audio susceptibility are derived. It is shown that different loop gains can be used to obtain information about relative stability and to enhance a poor design. Different implementations of current-mode control are discussed, and the most common problem encountered in practical circuit applications is shown. This problem is connected with the fact that, for high-power applications, the DC portion of the waveform is much larger than the ramp.<>
Keywords :
control system analysis; electric current control; power supplies to apparatus; power supply circuits; voltage control; audio susceptibility; closed-loop measures; current-mode control; design; loop gains; output impedance; power supplies to apparatus; power supply circuits; ramp; stability; switching regulators; voltage control; Control systems; Current supplies; Design engineering; Gain measurement; Impedance; Open loop systems; Power engineering and energy; Power supplies; Power system stability; Regulators;
Journal_Title :
Power Electronics, IEEE Transactions on
