D-CLASS TYPE POWER AMPLIFIER FOR PREVENTING AN OVER-RESPONSE PHENOMENON IN A TURNING PROCESS OF AN ABNORMAL STATE TO NORMAL STATE, CONCERNED WITH RESTRAINING A SATURATION STATE OF AN INTEGRAL CONTROLLING CIRCUIT OR A PROPORTIONAL INTEGRAL CONTROLLING CIRCUIT

摘要

PURPOSE: A D-class type power amplifier for preventing an over-response phenomenon in a turning process of an abnormal state to a normal state is provided to restrain a saturation state of an integral controlling circuit or a proportional integral controlling circuit by performing a sub negative feedback loop operation. CONSTITUTION: A sum circuit(100) is used for summing up an input signal and a negative feedback signal and outputting an error signal. An integral controlling circuit(200) is used for integrating the error signal and an integral signal. A feedback controller(300) is used for outputting a switching control signal in response to a monitoring signal. A switching circuit(400) is used for receiving the integral signal and outputting the integral signal to the auxiliary loop direction or the normal state loop direction. A sub negative feedback circuit(500) is used for outputting an auxiliary negative feedback signal of negative feedback signals which are generated from an integral signal process. A controlled circuit(600) is used for modulating the integral signal to a PWM signal and outputting an output signal generated from a switching amplification process and an LPF filtering process. A steady-state negative feedback circuit(700) is used for outputting a steady-state negative feedback by processing the output signal of the controlled circuit.