Parallel power supply combined with active dropout current sharing circuit

Abstract

The invention discloses a positive descent current distribution technology with connecting current limit function in the cascading power supplier, which is characterized by the following: the cascading power supplier possesses a current sensing amplifier, which generates differential current feedback signal of nominal output voltage and partial output voltage; the current sensing amplifier couples an original generator, which provides an original electric potential to define the voltage value corresponding to maximum allowance current of cascading power supplier; if the voltage potential of current feedback signal exceeds the original potential, which original potential producer can conduct and make current feedback signal couple a switch controller, which adjusts the output voltage of power converter to solve the current imbalance among several cascading power suppliers; the original potential producer can generate a current to switch controller to output sensing current, which limits output current within maximum allowance output current of power converter.

Description

technical field [0001] The present invention relates to a current sharing technology for parallel power supplies, and more particularly the present invention relates to an active drop current sharing circuit with current limiting function for parallel power supplies (active droop current sharing circuit). Background technique [0002] Switching power supplies generally function as basic power supply units for delivering power to meet the needs of electronic systems. For example, DC-DC converters are typically designed to convert a DC voltage level into one or several different DC voltage levels to meet a set of specifications. [0003] In actual operation, when providing power to an electronic system and considering the load capacity, two or more DC-DC converters are connected in parallel to form a parallel power supply system. Parallel power supply systems can provide high-level redundancy for special applications that require power distribution with high continuity and h...

AI Technical Summary

Problems solved by technology

[0012] While the conventional paralleled power supplies of Figure 1 are able to provide current sharing among several paralleled power supplies and provide overcurrent protection capabilities, known paralleled power supplies suffer from some major disadvantages

For example, the current distribution accuracy of conventional paralleled power supplies is generally limited

Furthermore, the traditional parallel power supply will add a large number of active components in the active drop current distribution circuit and over-current detection system, which will result in a bulky electronic product

Therefore, the traditional parallel power supply will be too bulky and inflexible in circuit design

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