Power switching method

Abstract

The invention discloses a power switching method. The power supply switching method is applied to the target control circuit. The target control circuit at least includes: a first power supply, a second power supply, a control terminal, a plurality of triodes and an output power supply, wherein the plurality of triodes at least includes: the first triode, the second three The power supply switching method includes: if the electric energy of the first power supply and the second power supply are input at the same time, when the control terminal is at a high level, the first triode is turned off, and the second triode is turned on , the third transistor is turned on, then the output power is switched to the power provided by the first power supply; if the electric energy of the first power supply and the second power supply are input at the same time, when the control terminal is at a low level, the first transistor is cut off, When the second triode is turned on and the third triode is turned on, the output power is switched to the power provided by the second power supply. The invention solves the technical problem that the two power sources are prone to mutual interference when dual power sources are used in the related art.

Description

technical field

[0001] The present invention relates to the technical field of circuit control, and in particular, to a power switching method. Background technique

[0002] In the related art, in a circuit with high power and heavy load, dual power supplies are generally used to realize the power saving function: one power supply is used for the operation of the controller, and the other power supply is used to control the power saving operation of the chip, which greatly reduces the power loss of the controller. When the controller is working normally, use a high-power power supply to maintain the operation of the controller and drive the load; when the controller does not need to work, enter power saving, use a low-power power supply, and only maintain the necessary work of the controller. However, this method of using dual power supplies for control often has the technical problem of mutual interference of the power supplies, which cannot guarantee the accuracy of power ...

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