CN2440287Y - Power-supply swithover device - Google Patents

Abstract

The utility model relates to a power supply switching device, which is composed of a power supply, a measuring unit, a logical judgment unit, and an executing unit. Under the condition of the power failure of alternating current, a direct current power supply can be switched in time. When the alternating current recovers, an alternating current power supply can also be automatically switched. Consequently, the continuous and the normal working of a computer can be ensured. Simultaneously, the utility model can be used on a similar device, with the advantages of novel design, simple structure, reliable performance, etc.

Description

Power switcher

The utility model is a kind of electrical installation, promptly a kind of power switcher.

At present, computer has obtained using widely in electric power system, and some essential industry Equipment Control are nearly all using a computer., when present computer disappears for some reason at alternating current, can only keep the very short time, for operating personnel data be deposited, and can not continue operate as normal by uninterrupted power supply UPS.

To be that development is a kind of can automatically switch to DC power supply to the purpose of this utility model under the situation that alternating current disappears, and guarantees the power transfer device of computer operate as normal.

Above-mentioned purpose is to be realized by following technical scheme: this power switcher is made of power supply and measuring unit, logic judgment unit, performance element, is characterized in that said power supply comprises AC power and DC power supply.AC power is by transformer B ₁Secondary line group W ₂Meet rectifier ZL ₁And capacitor C ₁Constitute with three-terminal voltage-stabilizing electric current 7812; Said measuring unit is by transformer B ₁Another secondary line group W ₃Meet rectifier ZL ₂And resistance R ₁Constitute; Said logic judgment unit is by operational amplifier IC ₁, resistance R ₂, R ₃, diode D ₁Constitute, said performance element is by the alternating current solid-state K switch ₁, the DC solid K switch ₂And triode T ₁Constitute; The DC solid K switch ₂Connect DC power supply.When alternating current was connected, operational amplifier was output as low level, T ₁, K ₂Short circuit and turn-off the alternating current solid-state K switch ₁Output AC power source.When alternating current disappears, K ₁Because of dead electricity is turn-offed, IC ₁The output high level, T ₁, K ₂Conducting, the output DC source.When alternating current recovers, IC ₁Conducting and make K ₂Turn-off K ₁Open output AC.

The power switcher that adopts such scheme to make under the situation of alternating current outage, can in time switch DC power supply, when alternating current recovers, and the AC power that can automatically switch again, thus guarantee computer operate as normal incessantly.Also have modern design simultaneously, simple in structure, dependable performance, and advantage such as can on similar devices, use.

Introduce a kind of embodiment below in conjunction with accompanying drawing.

Fig. 1 is the structured flowchart of present embodiment.

Fig. 2 is the circuit diagram of present embodiment.

As seen from Figure 1, this device is made of power supply, measuring unit, logic judgment unit and performance element.As seen from Figure 2, its power supply comprises AC power and DC power supply.At ordinary times, the 220V AC power is by transformer B ₁Primary line group W ₁Enter, at its secondary line group W ₂On induce the alternating voltage of 12V, through rectifier ZL ₁Rectification is again through capacitor C ₁After filtering and three-terminal voltage-stabilizing circuit 7812 are adjusted, export stable 12V direct current, add to operational amplifier IC ₁At this moment, another secondary line group W of transformer ₃With rectifier ZL ₂And R ₁Output is arranged, IC in the measurement loop of forming ₁Be output as low level, triode T ₁, the DC solid K switch ₂By short circuit, T ₁Be in cut-off state, K ₂Turn-off the alternating current solid-state K switch ₁Conducting, output AC.When alternating current disappears for some reason, the alternating current solid-state K switch ₁Because of the transformer dead electricity is turn-offed, and operational amplifier is output as high level, triode T ₁Saturation conduction, K ₂The DC solid switch is opened in 2 milliseconds, sends to DC power supply to load, guarantees the computer operate as normal.When alternating current recovers, transformer B ₁Be connected with alternating current, operational amplifier IC ₁Normal operation, the alternating current solid-state K switch ₁Open, and the DC solid switch turn-offs because of the operational amplifier conducting, thereby recover normal operating condition.

Claims (1)

1, a kind of power switcher is made of power supply and measuring unit, logic judgment unit, performance element, it is characterized in that said power supply comprises AC power and DC power supply, and AC power is by transformer B ₁Secondary line group W ₂Meet rectifier ZL ₁And capacitor C ₁Constitute with three-terminal voltage-stabilizing electric current 7812; Said measuring unit is by transformer B ₁Another secondary line group W ₃Meet rectifier ZL ₂And resistance R ₁Constitute; Said logic judgment unit is by operational amplifier IC ₁, resistance R ₂, R ₃, diode D ₁Constitute, said performance element is by the alternating current solid-state K switch ₁, the DC solid K switch ₂And triode T ₁Constitute; The DC solid K switch ₂Connect DC power supply, when alternating current was connected, operational amplifier was output as low level, T ₁, K ₂Short circuit and turn-off the alternating current solid-state K switch ₁Output AC power source, when alternating current disappears, K ₁Because of dead electricity is turn-offed, IC ₁The output high level, T ₁, K ₂Conducting, the output DC source, when alternating current recovers, IC ₁Conducting and make K ₂Turn-off K ₁Open output AC.

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