A switched-capacitor DC-DC converter using delta-sigma digital pulse frequency modulation control method

2013 ◽  
Author(s):  
Yongsuk Choi ◽  
Heungjun Jeon ◽  
Yong-Bin Kim
Keyword(s):  
Frequency Modulation ◽  
Control Method ◽  
Pulse Frequency ◽  
Switched Capacitor ◽  
Pulse Frequency Modulation ◽  
Delta Sigma ◽  
Digital Pulse ◽  
Modulation Control

A New Pulse Modulator for Solid Propellant Attitude Control Motors

2012 ◽  
Vol 429 ◽  
pp. 292-297
Author(s):  
Qi Sun ◽  
Jun Zhou ◽  
Zhi Lei Ge
Keyword(s):  
Attitude Control ◽  
Solid Propellant ◽  
Control Method ◽  
Stability Margin ◽  
Pulse Frequency ◽  
Modulation Scheme ◽  
Pulse Frequency Modulation ◽  
Interaction Factors ◽  
Modulation Control ◽  
The Stability

Antimissile interceptors with the attitude control motors (ACM) were researched. For solid propellant ACM, a pulse frequency modulation scheme is proposed, which is based on conventional PWPF modulator. The modulator extends the application of modulation control method to solid propellant ACM, and integrates it with a feedback of thrust estimation which is decided by location and thrust interaction factors. The stability of the new modulator was analyzed by Lyapunov method and a stability margin was given. Simulations show that the stability margin is conservative, but acceptable. Interceptor simulations using the modulator indicate that this technique provides closer-to-linear actuation than conventional bang-bang thruster control methods.

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