Power supply management circuit

Abstract

The invention discloses a power supply management circuit in the technical field of power supply protection. The power supply management circuit comprises a power supply module and an output signal comparison module, wherein the power supply module comprises a rectifier bridge module and large-current adjustable integrated voltage stabilization modules; the large-current adjustable integrated voltage stabilization modules are connected in parallel, and input ends of the large-current adjustable integrated voltage stabilization modules are connected with the rectifier bridge module; the rectifier bridge module is used for converting low-voltage input alternating current into high-voltage direct current to be output; the large-current adjustable integrated voltage stabilization modules are used for converting the input high-voltage direct current into low-voltage direct current and outputting the low-voltage direct current for a load to use; the output signal comparison module comprises an optocoupler isolation module and a voltage comparator chip module; the optocoupler isolation module is externally connected to the two ends of the voltage comparator chip module; and the optocoupler isolation module is used for isolating an external input signal. The power supply management circuit has the advantages that the structure is simple, the voltage stabilizing effect is obvious, and meanwhile, the electric energy consumption is reduced.

Description

Technical field[0001]The present invention relates to the field of power supply protection, in particular a power supply management circuit.Background technique[0002]Long-term, linear regulators have been widely adopted by the industry. The linear regulator used to be the basis of the power industry before the switch mode power supply has become the mainstream in the 1960s. Even today, the linear regulator is still in many applications. With the advent of the information age, power management technology becomes more and more important. In many power management techniques, LDO (Low Dropout Regulator, low voltage difference linear regulator), because of its small area, high power supply ratio, micro-power, low noise, and simple peripheral circuit, etc. In addition, LDO has a good linear transient response and load transient response characteristics, making it more suitable for portable electronic products, such as PDA, MP3 players, digital cameras, mobile phones, etc. Therefore, the L...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a power management circuit to solve the problem that the existing linear voltage regulator proposed in the above background technology consumes a large amount of power, and at the same time, there is another limitation of the linear voltage regulator, that is, the output voltage is connected to the input voltage. The minimum voltage difference between the voltages, the problem that the linear regulator can no longer regulate the output voltage when the output voltage is too close to the input voltage

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