Power source power off maintaining circuit

Abstract

The invention belongs to the field of avionics and particularly relates to a power source power off maintaining circuit. A main power source input channel circuit, a boosted circuit, an energy storage capacity charge circuit, an energy storage capacity discharge channel switch, an internal power source generation circuit, a channel switch control circuit, an input power source sampling circuit, a state control signal generation circuit and a power off timing circuit are arranged between a power source input end and a power source output end. The power source power off maintaining circuit is not influenced by fluctuation of power source input voltage, the capacity charge voltage can be stabilized at a fixed value; as the voltage at a capacity end is higher, the capacity energy density is improved, and the capacity use amount is greatly reduced; and a power off timing circuit is added, so that the power off maintaining time can be controlled, and the flexibility of design is improved.

Description

technical field [0001] The invention belongs to the technical field of avionics, and in particular relates to a power failure maintenance circuit. Background technique [0002] Avionics equipment is often powered by one set of DC power supply, or alternately powered by two sets of DC power supply. When the power supply is cut off or the power supply of two sets of power supply is switched, the load electronic equipment will experience a persistent or instantaneous power failure. For some electronic equipment with special requirements, when the power supply is cut off, the electronic equipment should be able to work for a period of time, and the electronic equipment can perform data backup and other protection functions during this time; when the power supply is cut off instantaneously, the electronic equipment It should not be affected by the instantaneous power failure of the power supply, and maintain the normal operation of the electronic equipment itself. Such as figu...

AI Technical Summary

Problems solved by technology

[0003] The traditional power-off maintenance circuit has the following three disadvantages: First, the energy stored in the capacitor is greatly affected by the input voltage of the power supply

Second, the capacitor energy density is low

In the traditional power supply maintenance circuit design, the input voltage of the power supply is often less than half of the rated working voltage of the capacitor, resulting in low energy density of the capacitor

Third, the power-off maintenance time is uncontrollable

But the ensuing problems are that the cost, volume, and weight of the electronic equipment itself increase greatly, and the power-off maintenance time becomes more uncontrollable, which is often unacceptable in practical applications.

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