A circuit for realizing current sharing by master-slave parallel connection

By using a master-slave parallel circuit design and employing isolation chips and differential signal transmission, the problems of poor anti-interference and poor module flexibility caused by non-isolated communication between power modules are solved, thereby improving the stability and flexibility of the power system.

CN224774809UActive Publication Date: 2026-09-18BEIJING DAHUA RADIO INSTR FACTORY
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Patent Information

Application Number
CN202521889174.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-03
Publication Date
2026-09-18
Estimated Expiration
2035-09-03

AI Technical Summary

Technical Problem

In existing power supply parallel schemes, the communication between power supply modules is not signal isolated, resulting in poor anti-interference performance. Furthermore, the lack of current sharing control bus selection between modules leads to poor flexibility.

Method used

By using a master-slave parallel connection, the master and slave devices are connected to the current sharing control bus through isolation chips, TTL and differential conversion units, and information gating switches, respectively, to achieve isolated transmission and flexible control of the current reference signal.

Benefits of technology

It improves the stability and anti-interference capability of the power supply parallel system, enhances the flexibility and output control balance between modules, and reduces the transmission loss of control signals.

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Abstract

The utility model discloses a circuit that realizes current sharing through master-slave parallel connection, and the master and multiple slaves are connected in parallel, and are connected to the current sharing control bus through isolation chip, TTL and differential mutual conversion unit, information gate switch in turn respectively, and constitute parallel current sharing circuit, including the current reference circuit of host computer issue and the processing circuit after slave computer receives the current reference signal from host computer. After multiple instrument power supplies are connected in parallel, the user sets master-slave parallel connection mode in front panel of power supply, and selects a master, and others are slaves, when multiple power supplies work in parallel, the master sends current reference signal to current sharing control bus through current reference generation circuit, and the slave outputs corresponding current value according to the current reference signal sent by the master. One of multiple instruments can be selected as master module, and it is high in flexibility and good in stability, has the characteristics of simple wiring and control, low control signal transmission loss, control signal is not easy to be disturbed, all power module output control is balanced and the like.
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