Constant voltage output circuit closed loop method and system

Abstract

The invention provides a constant voltage output circuit closed loop method and system, and belongs to the field of carrier communication. A main control chip is connected with a filtering and amplifying module through a DAC end, the filtering and amplifying module is connected with a coupling network module, the output of the filtering and amplifying module is connected with the main control chip through the DAC end, and the coupling network module is connected with a 220V network. AD sampling is carried out on a carrier output, filtered and amplified signal, a signal peak voltage finally output to the 220V network is determined according to the peak detection of an internal algorithm of the main control chip, and the signal peak voltage is compared with a set transmission voltage; if the output voltage is smaller than the set voltage resulting from the load change of a power network, the duty ratio of a pulse width modulated signal of a carrier chip is improved by software to improve the voltage of a carrier signal input to the power network; and on the contrary, the duty ratio of the pulse width modulated signal is reduced to finally counteract the load change to guarantee the consistency of a peak-to-peak value of the output voltage.

Description

technical field [0001] The invention relates to a circuit closed-loop method and system for constant voltage output, belonging to the field of carrier communication. Background technique [0002] In the field of carrier communication, the transmission voltage of the carrier signal is limited to ensure that the carrier signal will not affect the power supply of the normal power supply network. The load of the power network is an uncertain load that changes with time, which may range from a few ohms to tens of ohms. Under heavy loads, the carrier signal may reduce the peak-to-peak value of the output signal due to internal resistance division, which not only reduces the transmitted voltage Utilization, and may lead to carrier reception success rate. Contents of the invention [0003] The invention provides a circuit closed-loop method and system for constant voltage output, which can realize the closed-loop adjustment of the duty ratio of carrier pulse width modulation base...

AI Technical Summary

Problems solved by technology

The load of the power network is an uncertain load that changes with time, which may range from a few ohms to tens of ohms. Under heavy loads, the carrier signal may reduce the peak-to-peak value of the output signal due to internal resistance division, which not only reduces the transmitted voltage utilization, and may lead to carrier reception success rate

Images