Non-polar port circuit

Abstract

The invention discloses a non-polar port circuit, which is used for being connected with an external port including a positive terminal and a negative terminal. The non-polar port circuit comprises an internal port, an internal circuit module, a dual-path complementary single-pole double-throw switch and a switch control module; when the wireless port circuit is connected with the external port, a first terminal of the internal port electrically contacts one of the positive terminal and the negative terminal of the external port; a second terminal of the internal port electrically contacts with the other one of the positive terminal and the negative terminal of the external port; the internal circuit module is connected with the internal port through a first line and a second line; the dual-path complementary single-pole double-throw switch is used for achieving automatic line switching according to a control signal; the switch control module is used for generating the control signal according to detection signals of the first terminal and the second terminal of the internal port; the first line is connected to the positive terminal of the external port; and the second line is connected to the negative terminal of the external port, so that the internal circuit module obtains power supply voltage when the internal port is connected with the external port.

Description

technical field [0001] The present invention relates to power circuits, and more particularly, to non-polarity port circuits for power circuits. Background technique [0002] The ports of the power circuit usually have polarity restrictions, that is, the positive and negative poles should be in contact with the designated terminals. If the positive and negative poles are reversed, the power supply circuit will not work normally, or even cause a short circuit, causing the power supply or load circuit to burn out. Therefore, it is hoped that the ports of the power supply circuit can prevent the reverse connection of positive and negative poles. [0003] figure 1 A schematic block diagram of a power supply circuit according to the prior art is shown. As shown in the figure, the external port 110 is, for example, a plug, and is in contact with a terminal of the internal port 120 , and the internal port 120 is, for example, a socket. The internal port 120 is further connected...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned power supply circuit still has the situation of human error, resulting in reverse connection of positive and negative poles.

If the external power supply is switched when the positive and negative poles are reversed, the internal circuit module will not work

The above method of preventing positive and negative reverse connection not only requires a special mold for the plug and socket, resulting in higher costs, but also stops working when the positive and negative electrodes are reversed, resulting in poor user experience for household appliances and other products

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