Overcurrent protection circuit and DC power supply system

Abstract

Disclosed are an overcurrent protection circuit and a DC power supply system. The overcurrent protection circuit comprises an auxiliary power supply unit, a driving unit, a switching unit, a current detection unit and an overcurrent protection unit. The overcurrent protection circuit and the DC power supply system of the invention are provided with an overcurrent protection circuit, a driving unit, a switching unit, a current detection unit and an overcurrent protection unit. In practical application, the driving unit is used for supplying a driving voltage to the switching unit, Switching unit on, The voltage input from the external power supply is inputted to the current detection unit through the switching unit, and the current detection unit is used for converting the current signal into a voltage signal. When the overcurrent protection mechanism occurs, the overcurrent protection unit is turned on and the driving switching unit is turned off, so that the voltage input from the external power supply can not be inputted, thereby realizing the overcurrent protection. The present application is less affected by environmental parameters, has high control accuracy, eliminates the need for special reference configuration, and greatly reduces manufacturing costs.

Description

technical field [0001] The invention relates to the technical field of overcurrent protection, in particular to an overcurrent protection circuit and a DC power supply system. Background technique [0002] At present, the DC power supply is a device that maintains a stable voltage and current in the circuit. Such as dry batteries, storage batteries, DC generators, etc. The DC power supply has two electrodes, positive and negative. The potential of the positive electrode is high, and the potential of the negative electrode is low. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby forming an external circuit from the positive electrode to the negative electrode. negative current. A DC power supply is an energy conversion device that converts other forms of energy into electrical energy supply circuits to maintain a steady flow of current. A constant water flow cannot be mainta...

AI Technical Summary

Problems solved by technology

[0003] For the existing DC power supply, there is a DC power supply system inside the DC power supply. In order to ensure the safety and stability of the output voltage of the DC power supply system, an overcurrent protection circuit will be specially configured inside the DC power supply system to prevent the DC power supply system from overcurrent. situation, which in turn affects the subsequent power supply to the load

However, there are many defects in the existing over-current protection circuit. First, the existing over-current protection circuit is affected by environmental parameters. When it is more obvious, there will be a certain temperature drift, that is, the turn-on voltage of the triode will change correspondingly due to the change of temperature, which will affect the protection mechanism of the over-current protection circuit; the second is the existing over-current protection circuit. In order to improve the control accuracy, most of them use electronic components such as operational amplifiers to realize overcurrent protection, but operational amplifiers will increase the production cost of overcurrent protection circuits to a certain extent, which is not conducive to the promotion of products by enterprises; The current protection circuit needs to be specially configured with a reference voltage source. When the current at the output terminal is converted into a voltage, and the converted voltage is greater than or equal to the voltage of the reference voltage source, it will act as an overcurrent protection mechanism. Although the reference voltage source can be used very well It plays the role of over-current protection, but the cost is also very high. Manufacturers need to purchase additional reference voltage sources separately, which will greatly increase the manufacturing cost of over-current protection circuits, which is not conducive to the promotion of products by enterprises; the fourth is the existing over-current When the protection circuit needs self-recovery, the operational amplifier is also used for self-recovery, and the operational amplifier increases the manufacturing cost

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