Voltage-sharing control circuit and control method thereof

Abstract

The invention discloses a voltage-sharing control circuit and a control method thereof. The control circuit comprises three main power circuits connected in series, a sampling circuit and a main control chip, the output ends of the three main power circuits are connected with the input end of the sampling circuit, and the output end of the sampling circuit is connected with the main control chip;the main control chip is connected with the control ends of the three main power circuits respectively, each main power circuit comprises a full-bridge conversion module, a resonance module, a rectification module and a filtering module, and the full-bridge conversion module, the resonance module, the rectification module and the filtering module are connected in sequence; when a direct-current power supply outputs in a light-load or no-load mode, the three main power circuits carry out PWM control in a copy wave sending mode, meanwhile, the output voltage-sharing rings of the two main power circuits work to carry out drive signal duty ratio fine adjustment, and voltage-sharing control is achieved. The circuit provided by the invention has the advantage of solving the problem that the voltage of the direct-current power supply cannot be equalized during no-load or light-load output.

Description

technical field [0001] The invention relates to the field of electronic equipment for measurement and testing, and more particularly relates to a voltage equalization control circuit and a control method thereof. Background technique [0002] In the field of electronic technology, DC test power supply is one of the essential test instruments for power electronics companies. Since many devices under test require high-voltage testing, our DC test power supply is required to provide high-voltage output to meet various test environments. . The full-bridge conversion is currently a commonly used topology for high-frequency DC test power supplies, and the full-bridge conversion topology is limited by the development level of existing semiconductor devices, making it difficult to achieve high-voltage output in a single channel, so multiple channels in series will be used to achieve high voltage. Output, but the duty cycle of the main control signal is very small when the output is...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention lies in the problem that the prior art DC power supply cannot equalize the voltage when outputting with no load or light load

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