Main and standby power supply switching device

Abstract

The main and standby power supply switching device comprises a threshold setting unit, a switch control unit and a main and standby power supply switching unit. The threshold setting unit comprises a first arithmetic device and a second arithmetic device and is used for comparing the main power supply with an upper limit voltage threshold and a lower limit voltage threshold. The switch control unit comprises a first transistor and a second transistor and is used for connecting or disconnecting the circuit branches. And the main and standby power switching unit comprises a third transistor, a fourth transistor, a first diode, a second diode and an anti-backflow device, and is used for realizing the switching of the main and standby power supplies according to the on-off condition of the circuit branches. The device is a circuit capable of switching the main power supply and the standby power supply within a certain threshold range, the risk of voltage superposition and repeated switching of the main power supply and the standby power supply can be avoided, voltage within a stable range is provided for a load, the circuit is simple, and a rapid switching function is easy to realize.

Description

technical field [0001] Embodiments of the present disclosure generally relate to the technical field of power management, and more specifically, relate to an active / standby power switching device. Background technique [0002] With the development of science and technology and the continuous application of Internet technology, the controllers of various devices have to have the function of keeping online in real time or going offline after working for a certain period of time. At the same time, energy management puts forward higher requirements on the power consumption of the controller when it is in standby, so more and more controllers integrate small batteries (dry batteries or lithium batteries) as backup power sources to reduce the energy consumption of the batteries of the equipment itself. Therefore, an effective main-standby power switching circuit is required. [0003] Although the existing main-standby power supply switching circuit can realize the switching funct...

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Problems solved by technology

[0003] Although the existing main and standby power supply switching circuits can realize the switching function, the switching setting value is a single threshold, and only the switching lower limit threshold is set, that is, only the undervoltage situation is considered, and the switching upper limit is not considered.

Moreover, the existing main-standby power supply switching circuit can only realize the switching of voltage presence or absence, and repeated fluctuations in the voltage of the main-standby power supply at a certain moment may occur

The above defects may cause certain damage to the load

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