Power supply circuit and method

Abstract

The invention provides a power supply circuit which comprises at least one main circuit and at least one assistant circuit; the at least one main circuit comprises at least one battery, a load and at least one main circuit switch controlling the connection of the main circuit; the at least one assistant circuit comprises a current limiting unit and a current pilot unit; the at least one assistant circuit is connected with the at least one main circuit and the load; the invention also provides a power supply method of the power supply circuit. The power supply circuit and the power supply method provided by the invention can realize the electrification of a plurality groups of batteries respectively; the current limiting unit is utilized for preventing the batteries from being damaged; the current pilot unit, such as a switching tube, etc. is utilized to ensure the normal power supply of the load; the invention does not rely on extra assistant equipment and manual operation, does not have special requirements for power supply source and the batteries, has no safety hidden danger, is convenient for realizing intelligent automatic control, has simple circuit and low cost and is convenient for promotion and use.

Description

technical field [0001] The invention relates to the field of power supply, in particular to a power supply circuit and a power supply method. Background technique [0002] At present, in the power supply industry, especially the communication power supply industry, in order to expand the battery capacity and backup each other, it is often necessary to connect multiple batteries in parallel. attached figure 1 A common power supply circuit is shown. The battery B1 and battery B2 connected in parallel are controlled to be connected / disconnected from the load by closing / disconnecting the switch C12, that is, the battery is powered on / off, wherein the power supply continues to supply power to the load. At the moment when the battery is powered on, if the load electromotive force (voltage) is higher than the battery electromotive force, a charging current will be formed on the battery. Because the internal resistance of the battery is very small and the charging current is often...

AI Technical Summary

Problems solved by technology

To sum up, the existing power supply schemes have the following limitations and defects: high requirements on the power supply, requiring it to have voltage regulation or current limiting functions; it may cause deep discharge of the battery, which is a safety hazard for uninterruptible power supplies; Manual participation or the need for auxiliary equipment, high maintenance requirements and high costs

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