Switching power supply circuit capable of detecting current

Abstract

The invention relates to a switching power supply circuit capable of detecting a current. The circuit comprises a current detection circuit, a logic control circuit and a switching power supply main circuit. The input end of the current detection circuit is electrically connected with the output end of the switching power supply main circuit; the output end of the current detection circuit is electrically connected with one signal input end of the logic control circuit, a CPU control signal is accessed to the other signal input end of the logic control circuit, and the output end of the logiccontrol circuit is electrically connected with the input end of the switching power supply main circuit. According to the invention, the current detection circuit collects a current signal outputted by the switching power supply main circuit, and logic comparison is carried out on the current signal and a CPU control signal through a logic control circuit; therefore, a logic level signal is outputas a control signal for controlling the switching power supply main circuit so as to control the working state of the switching power supply main circuit, thereby avoiding the overvoltage and overcurrent phenomena of the whole switching power supply circuit. The whole circuit is low in energy consumption, high in detection precision and stable in power supply.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a switching power supply circuit capable of detecting current. Background technique [0002] Nowadays, the integration and precision of integrated circuit chips in intelligent electronic and communication equipment are getting higher and higher, and the requirements for power supply are also getting higher and higher. The main features are low energy consumption, high precision, and stable power supply. In this way, it is required that the output voltage and current of the switching power supply remain stable without overvoltage and overcurrent phenomena, but there is no switching power supply circuit in the prior art that can detect whether the current is within the set range, so when the output current of the switching power supply fluctuates or even exceeds Usually, the set range cannot be found in time, which has a certain impact on the safety and stability of the...

AI Technical Summary

Problems solved by technology

In this way, it is required that the output voltage and current of the switching power supply remain stable without overvoltage and overcurrent phenomena. However, there is no switching power supply circuit in the prior art that can detect whether the current is within the set range, so when the output current of the switching power supply fluctuates or even exceeds It is usually not found in time when the set range is set, which has a certain impact on the safety and stability of the switching power supply in practical applications.

If you want to detect the output current of the switching power supply, you usually need to connect an external current detection circuit, which is not only very troublesome, but also the detection accuracy cannot be guaranteed.

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