Power circuit

Abstract

The embodiment of the invention discloses a power circuit which comprises a first power module, a second power module and a switch switching module, wherein the first power module is connected with a voltage input end, a voltage output end and ground and used for outputting a load current when the load current is lower than a preset current; the second power module is connected between the voltage input end and the ground and used for outputting the load current when the load current reaches the preset current; and the switch switching module is connected with the voltage input end, the first power module and the second power module and used for switching to the second power module so as to output the load current when the load current reaches the preset current. With the adoption of the power circuit, the power circuit can be automatically switched according to the size of the load current, stable working of a load is kept, and the power circuit is simple in structure and low in cost.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a power supply circuit. Background technique [0002] In the field of electronic circuits, power circuits are widely used as the working basis of other circuits. In particular, switching power supply and linear regulated power supply are the most common and most frequently used power supply circuits, and their role cannot be ignored. However, in the prior art, these two power supply circuits generally exist and work separately. If the load current of the circuit is small, a linear regulated power supply can be used, but when the load is heavy, the linear regulated power supply can continue to be used. Otherwise, the loss and heat generation of the circuit will be large, so it is necessary to switch to the switching power supply when the load current is high to reduce the loss and heat generation of the circuit. In this case, two power supply circuits need to be independently set in th...

AI Technical Summary

Problems solved by technology

However, in the prior art, these two power supply circuits generally exist and work separately. If the load current of the circuit is small, a linear regulated power supply can be used, but when the load is heavy, the linear regulated power supply can continue to be used. Otherwise, the loss and heat generation of the circuit will be large, so it is necessary to switch to the switching power supply when the load current is high to reduce the loss and heat generation of the circuit. In this case, two power supply circuits need to be independently set in the circuit and manually selected Switching, complex circuit structure, high cost, and inconvenient switching

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