CN2593256Y

CN2593256Y - Computer protective power source of AC-DC input

Info

Publication number: CN2593256Y
Application number: CN 02288375
Authority: CN
Inventors: 许芸
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-10
Filing date: 2002-12-10
Publication date: 2003-12-17
Anticipated expiration: 2012-12-10

Abstract

The utility model relates to an AC/DC input computer protective power supply. A main power supply circuit formed by connecting an AC/DC converting and voltage stabilizing circuit, a DC/DC converting inverting circuit and a DC/DA converting inverting circuit is arranged between a filtering rectification circuit and an output circuit, and meanwhile the utility model is provided with an auxiliary power supply formed by connecting a charging circuit and a battery. When the commercial power is suddenly cut off, a computer triggers a control circuit through a soft switch to immediately switch on the auxiliary power supply to work continuously and ensure computer data not to lose, and the utility model has the advantages of simple circuits and perfect protective circuits.

Description

The guard of computer power supply of alternating current-direct current input

Technical field

The utility model relates to a kind of computer power supply (being the ATX power supply), specifically, is to have the computer power supply that postpones power-off protection function when civil power cuts off the power supply.

Background technology

At present, what main frame power supply on the market used is known computer power supply, in the user uses a computer process, if civil power interrupts suddenly, tend to cause computer data to lose, sometimes even cause computer system paralysis, cause losing and destroying of a large amount of critical datas.The user who has can prepare uninterrupted power source (being ups power) usually in addition in order in time to store data and protection computer system when civil power interrupts.But because computer power supply separates with ups power, independent separately, this makes troubles for the computer user in installation and use, generally to adopt switch to switch between computer power supply and the ups power, when handoff delay surpasses 10ms, computing machine will restart, and make the loss of data of not preserving in the computing machine.Another kind of situation, at no civil power and with the occasion of DC power supply, the user need join inverter in addition and just can use a computer.

Summary of the invention

The purpose of this utility model is to provide the guard of computer power supply of the preferential input of a kind of power of alterating and direct current automatic switchover civil power.

The purpose of this utility model is achieved in that and comprises filter rectifier, output circuit, be that the main feed circuit that are composed in series by AC/DC conversion mu balanced circuit, DC/DC and DC/AC conversion inverter circuit are set between described filter rectifier and output circuit, the auxiliary electric power supply that is composed in series by charging circuit and battery is set simultaneously, the input end of charging circuit is connected with AC/DC conversion mu balanced circuit, and the output terminal of battery is connected with DC/AC conversion inverter circuit with DC/DC.

The utility model is owing to adopted the power of alterating and direct current automatic switchover; the protection power supply of the preferential input of civil power, when civil power interrupted suddenly, computing machine is connected auxiliary electric power supply at once by soft switch triggering control circuit worked on it; do not need to restart; guarantee that computer data can not lose, directly adopt the DC/DC conversion during inversion, its inversion efficiency can reach 80～90%; adopt the 2.5AH battery; about 7 minutes of its delay time, circuit is simple, and holding circuit is perfect.

Description of drawings

Fig. 1 is a theory diagram of the present utility model;

Circuit theory diagrams when Fig. 2 is the utility model mains-supplied;

Circuit theory diagrams when Fig. 3 is the power supply of the utility model accessory power supply.

Embodiment

With reference to Fig. 1, Fig. 2, Fig. 3, the utility model is the main feed circuit that connected and composed successively by filter rectifier Fig. 1, AC/DC conversion mu balanced circuit 2, DC/DC and DC/AC conversion inverter circuit 4, output circuit 5, with connect with the battery E auxiliary electric power supply formation of formation of electricity charging road 3, the input end of charging circuit 3 is connected with AC/DC conversion mu balanced circuit 2, battery E is the 2.5AH battery, and its output terminal is connected with DC/DC, DC/AC conversion inverter circuit 4.Filter rectifier 1 is made up of thermistor LT1, wave filter B1, rectifier bridge BD1, resistance R 1～R3, the capacitor C 1～C6 of K switch 1, negative temperature coefficient.AC/DC conversion mu balanced circuit 2 is made up of switch voltage-stabilizing circuit and auxiliary power circuit.Switch voltage-stabilizing circuit is made up of transformer T1, T2, ic chip 1, field effect transistor U1～U4, diode 2D1, D1～D12, resistance R 4～R10, R16～R37, capacitor C 7～C10, C16～C20.The auxiliary power circuit is made up of transformer T3, ic chip 2, protection diode ZD1, diode D17, resistance 9.Charging circuit 3 is made up of ic chip 3, soft switch LD1, voltage stabilizing diode JD2, diode D18～D22, inductance L 5, resistance R 10～R15, capacitor C 11～C15.DC/DC and DC/AC conversion inverter circuit 4 are made up of transformer T2, ic chip 2, field effect transistor U1, U2, rectifier bridge ZD4, resistance R 23～R33, capacitor C 7～C10, C20, C24.Output circuit 5 is made up of field effect transistor U3, voltage stabilizing diode JD1, diode 2D1～2D3, D7～D16, inductance L 1～L4, L21～L24, resistance R 9～R18, R20～R22, R34, capacitor C 11～C19, C25～C28.

Principle of work: when mains-supplied, alternating current becomes alternating current into direct current through filter rectifier 1.After direct current one routing switch mu balanced circuit is isolated high voltage direct current, become low-voltage dc power supply, import by DC/DC and DC/AC conversion inverter circuit 4 through the port of rectifier bridge 2D4, with low-voltage dc power supply, through output circuit 5 be transformed into main frame required+5V ,-5V, 3.3V ,+12V ,-the various direct supplys of 12V, and export the required AC power of display to through transformer T2.Another road is given battery E charging through auxiliary power to charging circuit 3.When battery E interrupts suddenly at civil power, replace low-voltage dc power supply another port input, finish all working of quadratic transformation through rectifier bridge 2D4.Charging circuit 3 also has the function that auxiliary power is played pressure stabilization function.

Claims

1; a kind of guard of computer power supply of alternating current-direct current input; comprise filter rectifier (1); output circuit (5); it is characterized in that: between described filter rectifier (1) and output circuit (5), be provided with by AC/DC conversion mu balanced circuit (2); the main feed circuit that DC/DC and DC/AC conversion inverter circuit (4) are composed in series; the auxiliary electric power supply that is composed in series by charging circuit (3) and battery (E) is set simultaneously; the input end of charging circuit (3) is connected with AC/DC conversion mu balanced circuit (2), and the output terminal of battery (E) is connected with DC/AC conversion inverter circuit (4) with DC/DC.