CN1349146A

CN1349146A - PUA microcomputer power source

Info

Publication number: CN1349146A
Application number: CN 01133685
Authority: CN
Inventors: 郁百超
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-11-19
Filing date: 2001-11-19
Publication date: 2002-05-15
Anticipated expiration: 2021-11-19
Also published as: CN1140863C

Abstract

PUA microcomputer power source has 4 functions of PFC, UPS, ATX and electrical source used in LCD. But the cost, volume, weights and power dissipation are almost equivalent to ATX. Since some steps are avoided such as conversion in UPS, voltage bossting and inversion in the ATX, so storage battery of PUA has very high efficiency, for exampling No.5 rechargeable battery can be cascaded to 12V for LCD to use. PUA is the same as ATX in functions when storage battery is not connected in.

Description

The PUA computer power

The invention belongs to a kind of microcomputer switch power special.

For the microcomputer power supply is not interrupted, must increase uninterrupted power source UPS equipment at the input end of Switching Power Supply.Increase equipment, also just introduced the dangerous and factors of instability, reduced the reliability of total system.

At present, the display device of microcomputer no longer is the situation that CRT rules all the land, and LCD has been occupied the half river and gone out.Along with progress of science and technology, environmental protection, LCD energy-conservation and hommization will replace traditional C RT display device fully.Because liquid crystal display no longer necessarily needs the high-voltage alternating power supply, therefore, the power supply mechanism of microcomputer faces once new change.

Traditional pc switching mode power supply ATX, its input voltage are that 220V exchanges, and after rectifying and wave-filtering and DC converting, provide the operating voltage of microcomputer 3-12V.Popular LCD has independently Switching Power Supply at present, and identical with the circuit topography of pc switching mode power supply, only the power consumption because of LCD is little, and its output power is little.Electric capacity input type filtering circuit in this class power supply, input current is seriously distorted, not only electrical network is produced serious harmonic pollution, and cause switch power supply power factor to reduce, its power factor is about about 0.65, and total harmonic distortion is more than 95%, and all there are same problem in the uninterrupted power source UPS of current trend and LCD power supply.In the face of the compulsory execution of international standards such as IEC 555-2, IEEE519, above-mentioned all kinds of power rows will be died, and be forced to withdraw from the market.

In order to adapt to above-mentioned pressure standard, above-mentioned all kinds of power supply all must increase power factor corrector between its rectifier and wave filter, be PFC, Fig. 1, Fig. 2, Fig. 3 are respectively ATX, UPS and LCD power supply have increased pfc circuit behind rectifier theory diagrams.Although ATX power supply and LCD power supply are connected on the back of UPS, pfc circuit wherein can not be economized.If saved pfc circuit, the back that is connected on UPS is feasible certainly, because UPS has had the function of capability correction, does not need to proofread and correct once again.But microcomputer is not necessarily to leave no choice but be connected on the UPS back could use, and when microcomputer directly connects civil power, will constitute harmonic pollution to electrical network.

Purpose of the present invention is intended to the microcomputer power source special PUA that releases a kind of PFC of having function, UPS function and be suitable for liquid crystal display, to adapt to the international standards such as IEC 555-2, IEEE519 that are about to compulsory execution, the PUA power supply is when increasing PFC and UPS function, and its cost, volume, weight, power consumption are identical with traditional ATX power supply.

The objective of the invention is to realize: after the ATX switching power rectifier, insert PFC with following proposal, make the ATX power supply possess power factor emendation function, PFC is output as the DC voltage about 12V, by diode D1 to charge in batteries, level DC/DC in back is provided the operating voltage of transducer simultaneously, the specified input voltage of the transducer of discussing be 12VDC.When civil power interrupts, to power to the DC/DC transducer by controllable silicon by accumulator E1, civil power is in 40 microseconds to battery-driven switching time.The dc low-voltage that the DC/DC transducer is exported can provide the operating voltage of liquid crystal display, no longer needs to carry out extra Power Conversion, and the PUA computer power has following characteristics:

1. replace three equipment with an equipment, increase the reliability of system greatly.

2. the cost of system, volume, weight, power consumption can reduce about 80%.

3.PUA computer power can together be put into Microcomputer box together with accumulator, has increased the security of system.

4.PUA computer power integrates energy-saving and environmental protection, high added value, is a kind of the green of traditional ATX that replace

The look power supply.

Fig. 1 is the theory diagram that increases the ATX microcomputer switch power special of PFC function.

Fig. 2 is the theory diagram that increases traditional UPS of PFC function.

Fig. 3 is the theory diagram that increases the LCD Switching Power Supply of PFC function.

Fig. 4 is the theory diagram of PUA computer power.

Address before Fig. 1, Fig. 2, Fig. 3.

The present invention has PFC, UPS, ATX and four kinds of functions of LCD power supply simultaneously concurrently, is called for short the PUA computer power.Fig. 4 is a theory diagram, be provided with rectifier, wave filter, accumulator and DC converter, access power factor correcting device between rectifier and wave filter, accumulator adopts 12V low pressure, the input voltage of DC converter also adopts 12V low pressure, and charger is connected on after the PFC.

Power factor corrector adopts APFC, and its output voltage is variable in the 12VDC-15VDC scope, is that the accumulator of 12V fills the needs with floating charge soon to adapt to nominal value.Though this voltage earthquake, but still within the working range of DC/DC transducer.

The charger of PUA is made up of diode D1, controllable silicon SCR 1 and resistance R 1, and the negative pole of D1 connects the positive pole of E1, and the positive pole of D1 meets R1, the positive pole of another termination PFC output of R1, and the positive pole of SCR1 connects the positive pole of E1, and its negative pole connects the positive pole of DC/DC transducer input end.This charging circuit and characteristics are, between normal epoch, only do not discharge by charging at civil power for accumulator, because the existence of D1 and SCR1, E1 not have the passage that discharges, and when civil power interrupted, SCR1 was open-minded in 40 microseconds, guaranteed that subscriber equipment voltage does not interrupt.The 12V voltage that LCD is required, power consumption are 20% of traditional C RT, and its input voltage can directly be taken from the 12VDC output terminal of the DC/DC transducer of PUA computer power.

Accumulator voltage is 12V, and capacity is decided according to the length of delay time.Because the PUA computer power has been exempted boosting and the inversion link of all transform parts of UPS and LCD power supply and ATX power supply fully, the service efficiency of accumulator is very high, simultaneously because the LCD power consumption is very little, therefore accumulator also can adopt No. 5 rechargeable batteries to be connected in series to 12V and to organize in parallel use according to the length of delay time more, and can battery be installed at the Microcomputer box bottom opening, it is the same with " walkman " that microcomputer just becomes, and uses battery convenient freely; When not connecing accumulator, the PUA computer power is identical with the function of ATX pc switching mode power supply.

Rectifier, active power factor corrector APFC, wave filter, charger and DC converter that the PUA computer power adopts all are prior aries, need not give unnecessary details.APFC has two-way to detect and two-way control, Control current and voltage simultaneously, and this just is being fit to the filling soon of charge in batteries, floating charge is controlled.Active power factor corrector can adopt the pfc circuit based on the buck transducer, also can adopt the pfc circuit based on anti exciting converter, and the latter has pulse transformer, can realize the isolation of input and output.

Claims

1. microcomputer switch power special, be provided with rectifier, wave filter, accumulator and DC converter, it is characterized in that: access power factor correcting device PFC between rectifier and wave filter, accumulator adopts 12V low pressure, the input voltage of DC converter also adopts 12V low pressure, and charger is connected on after the PFC.

2. power supply according to claim 1 is characterized in that: power factor corrector adopts APFC, and its output voltage is 12VDC-15VDC.

3. power supply according to claim 1, it is characterized in that: charger is made up of diode D1, controllable silicon SCR 1 and resistance R 1, the negative pole of D1 connects the positive pole of E1, the positive pole of D1 meets R1, the positive pole of another termination PFC output of R1, the positive pole of SCR1 connects the positive pole of E1, and its negative pole connects the positive pole of DC/DC transducer input end.

4. power supply according to claim 1 is characterized in that: the capacity of accumulator is decided according to the length of delay time, also can adopt No. 5 rechargeable batteries to be connected in series to 12V, organizes in parallel the use according to the length of delay time more more; For easy to use, can battery be installed at the Microcomputer box bottom opening.