Dual power supply switching circuit and dual power supply switching controller

Abstract

The invention discloses a dual power supply switching circuit and a dual power supply switching controller. The dual power supply switching circuit comprises: a first power transmission circuit comprising two MOS tubes which are mutually blocked from conducting, wherein the input end is connected with the output end of a first power adapter, the first end of a voltage dividing threshold circuit and the first end of a current anti-backfilling circuit, and the output end is connected with the second end of the current anti-backfilling circuit and the power supply end. The second end of the voltage dividing threshold circuit is connected with one end of a delay circuit, and the other end of the delay circuit is connected with the third end of the current anti-backfilling circuit. The third end of the current anti-backfilling circuit is connected with the first end of a dual power supply interlocking circuit. The second end of the dual power supply interlocking circuit is connected with the third end of the voltage dividing threshold circuit, and the third end of the dual power supply interlocking circuit is connected with the first end of a second power transmission circuit. The second end of the second power transmission circuit is connected with the output end of a second power adapter, and the third end is connected with the second end of the current anti-backfilling circuit and the power supply end.

Description

technical field [0001] The invention relates to the field of control, in particular to a dual power supply switching circuit and a dual power supply switching controller. Background technique [0002] At present, there are notebooks that need to use the dual power supply mode of the traditional Standard Adapter (that is, a standard adapter, a small round port or a small square port) and Type C (that is, a universal serial bus adapter). The control method is mainly to use EC (Embeded Controller, embedded controller) to detect the access of two sources (power supply), use resistor divider to detect the access voltage of the two sources for comparison, and then control the comparison results separately Two-way source switching. [0003] However, in the process of controlling the switching of the two sources, if the switching is unsuccessful, the system current will be fed back, leading to various adverse situations and destroying system performance. Contents of the invention...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention proposes a dual power supply switching circuit and a dual power supply switching controller to solve the following problems in the prior art: in the process of controlling the switching of two sources, if the switching is unsuccessful, the Cause system current backflow, lead to various bad situations, and destroy system performance

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