Control method and control apparatus using control signals to control states of transistors in BUCK-BOOST topology

摘要

A control method and a control apparatus are provided. The control method and apparatus are applied to a BUCK-BOOST topology. The method specifically is, processing an output signal of a topology to obtain a pulse width modulation signal, performing an OR operation between the pulse width modulation signal and a first modulation signal to obtain a first control signal so as to control a state of a first transistor on the topology, and performing an AND operation between the pulse width modulation signal and a second modulation signal to obtain a second control signal so as to control a state of a second transistor on the topology. Therefore, the method achieves three topology states and a smooth switchover among the three topology states. In addition, the control circuit is relatively simple, expanding the control scope and improving the control precision.

主权项

1. A control method applied to a BUCK-BOOST topology, comprising:
processing an output signal of the BUCK-BOOST topology to obtain a pulse width modulation signals; performing an OR operation between the pulse width modulation signal and a first modulation signal to obtain a first control signal to control a state of a first transistor on the BUCK-BOOST topology; and performing an AND operation between the pulse width modulation signal and a second modulation signal to obtain a second control signal to control a state of a second transistor on the BUCK-BOOST topology, wherein processing the output signal of the BUCK-BOOST topology to obtain the pulse width modulation signal comprises:
obtaining a loop signal based on the output signal of the BUCK-BOOST topology and a reference signal; andobtaining the pulse width modulation signal based on the loop signal and a comparison signal.