CN1403894A

CN1403894A - Voltage converting card suitable for mainboard

Info

Publication number: CN1403894A
Application number: CN 02146802
Authority: CN
Inventors: 曾乙刚; 张文清
Original assignee: Via Technologies Inc
Current assignee: Via Technologies Inc
Priority date: 2002-10-11
Filing date: 2002-10-11
Publication date: 2003-03-19
Anticipated expiration: 2022-10-11
Also published as: CN1226680C

Abstract

The present invention is voltage converting card suitable for mainboard. The mainboard has one first slot for the first voltage source, and the voltage converting card has one first slkot, several pins and one voltage converting circuit. The voltage converting circuit has input and output, the first voltage source is input into the converting circuit via the several pins of the input coupled to the mainboard, and the second voltage is output via the output.

Description

Be applicable to the voltage transitions card of motherboard

Technical field

The present invention relates to computer part, the voltage transitions card that particularly uses on the computer main board.

Background technology

Owing to economize the demand of electrical specification and the development of integrated circuit fabrication process, the operating voltage of many integrated circuit is also along with reduction, therefore therefore the operating voltage of many PCI adapters also reduces, but the PCI slot on the old motherboard only provides 5V voltage, the voltage of 3.3V is not provided, therefore must revise the motherboard circuit, 5V and 3.3V voltage are provided or revise adapter card circuit.

Summary of the invention

In view of this, the present invention one is applicable to the voltage transitions card of motherboard, motherboard has first slot in order to first voltage source to be provided, transition card has first slot, a plurality of pin and voltage conversion circuit, change-over circuit has input end and output terminal, and wherein, input end is by a plurality of pins and first voltage source that is coupled to motherboard, input voltage is exported second voltage source to change-over circuit via output terminal.

For described and other purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:

Description of drawings

Fig. 1 represents embodiment of the invention structural drawing.

Fig. 2 voltage conversion circuit functional block diagram.

Fig. 3 represents toggle switch adjustment voltage synoptic diagram.

Fig. 4 represents PCI slot functional block diagram.

Symbol description:

10PCI slot 20 voltage transitions cards

21 mu balanced circuits, 23 voltage adjusters

25PCI slot 27 pins

200 voltage conversion circuits, 300 motherboards

32 toggle switchs

Embodiment

Fig. 1 represents embodiment of the invention structural drawing.As shown in Figure 1, be positioned at a PCI slot 10 and a voltage transitions card 20 on the motherboard 300.Wherein voltage transitions card 20 comprises voltage conversion circuit 200, PCI slot 25 and pin 27.Voltage conversion circuit 200 comprises mu balanced circuit 21 and voltage adjuster 23.PCI slot 10 provides 5V voltage, and the output end vo ut of mu balanced circuit 21 offers the needed voltage of the computer adaptive card that is coupled on the PCI slot 25 via PCI slot 25 output 3.3V voltages.

Fig. 2 represents the voltage conversion circuit functional block diagram.Voltage conversion circuit 200 comprises mu balanced circuit 21, resistance R 1, resistance R 2, toggle switch (dip switch) 32, resistance R 11, resistance R 12, resistance R 13 and variable resistor R14.Toggle switch 32 couples in order to select resistance R 11, R12, R13 and variable resistor R14, and mu balanced circuit 21 is general linear voltage regulators, has three end points, input end V _In, adjust end A _Dj, output terminal V _OutResistance R 1, R2, toggle switch 32 are formed voltage adjuster 23, just a feedback circuit with variable resistor 3.The contact of resistance R 1 and resistance R 2 is couple to the adjustment point A of mu balanced circuit 21 _DjThe reference voltage V of mu balanced circuit 21 _Ref, the ratio of resistance R 2, R1, and the ratio of toggle switch 32 selected resistance R 3 and resistance R 1, the adjustment electric current I of mu balanced circuit 21 _AdjProduct decision output voltage V with resistance R 2, resistance R 3 _Out

V _out＝V _ref(1+(R2+R3)/R1)+I _adj*(R2+R3)

Capacitor C 1 is as frequency compensation, makes mu balanced circuit 21 more stable.

Fig. 3 represents toggle switch adjustment voltage synoptic diagram.Toggle switch 32 comprises 4 switch S 1, S2, S3 and S4.As shown in Figure 3, when switch S 1 conducting and other switch were closed, toggle switch 32 selected resistance R 11 to be couple to resistance R 2, mu balanced circuit 21 output terminal V _OutVoltage is near 3V.When switch S 2 conductings and other switch were closed, toggle switch 32 selected resistance R 12 to be couple to resistance R 2, mu balanced circuit 21 output terminal V _OutVoltage is near 3.3V.When switch S 3 conductings and other switch were closed, toggle switch 32 selected resistance R 13 to be couple to resistance R 2, mu balanced circuit 21 output terminal V _OutVoltage is near 3.6V.When switch S 4 conductings and other switch were closed, toggle switch 32 selected variable resistor R14 to be couple to resistance R 2, mu balanced circuit 21 output terminal V _OutVoltage is adjustable to the needed voltage of adapter on the PCI slot 25.Resistance R 11, R12, R13 can be used as coarse adjustment (coarse tuning) voltage and use, and variable resistor R14 can be used as fine tuning (fine tuning) voltage and uses.

Fig. 4 represents PCI slot functional block diagram.As shown in Figure 4, PCI slot 10 and PCI slot 25 all have the 5V pin A11 of PCI specification appointment, A15, and A17, A19, A21, A23, A25, and do not use pin B11, B15, B17, B19, B21, B23, B25, B29.But new PCI specification is specified and is not used pin B11, B15, and B17, B19, B21, B23, B25, B29 are the 3.3V pin.PCI slot 10 is positioned at motherboard 300,300 of motherboards provide 5V voltage, when a plurality of pins 27 of voltage transitions card 20 insert the PCI slot 10 of motherboards 300,5V voltage offers voltage conversion circuit 200 on the voltage transitions card 20 by pin A11, A15, A17, A19, A21, A23, the A25 of a plurality of pins 27.The output terminal of voltage conversion circuit 200 is selected no pin B11, B15, B17, B19, B21, B23, B25, the B29 that is couple to PCI slot 25, in order to 3V to be provided voltage, meets new PCI specification 3.3V pin.

Voltage transitions card of the present invention has following advantage:

(1) utilize voltage-regulating circuit that the voltage transitions of motherboard is become the needed voltage of PCI slot, motherboard can more resilient use.

(2) can be by feedback resistance, stepless is adjusted the voltage of PCI slot, therefore can freely test the adapter on the PCI slot.

(3) needn't revise old motherboard, the PCI slot provides the motherboard of single power supply can continue to use.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any insider, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim book person of defining.

Claims

1. voltage transitions card that is applicable to motherboard, this motherboard has one first slot so that first voltage source to be provided, and comprises at least:

One second slot;

A plurality of pins are in order to insert described first slot; And

One voltage conversion circuit has an input end and an output terminal, and wherein said input end is coupled to described first voltage source by described a plurality of pins, and described output terminal is coupled to described second slot, and exports one second voltage source.

2. voltage transitions card as claimed in claim 1, wherein said voltage conversion circuit comprises at least:

One mu balanced circuit, it has a first input end, adjusts end and one first output terminal, and wherein said input end is coupled to described first voltage source by described many pins; And

One voltage-regulating circuit, it has one second input end and one second output terminal, and wherein said input end is coupled to described circuit output end of pressure-stabilizing, and output terminal is coupled to described mu balanced circuit adjustment end.

3. voltage transitions card as claimed in claim 2, wherein said voltage-regulating circuit comprises at least:

First resistance, its be coupled to this second input end of described voltage-regulating circuit and described voltage-regulating circuit this second output terminal between; And

Second resistance, it is coupled between this second output terminal and an earthing potential of described voltage-regulating circuit.

4. voltage transitions card as claimed in claim 2, wherein said voltage-regulating circuit comprises at least:

First resistance, it is coupled between this second output terminal of this second input end of described voltage-regulating circuit and described voltage-regulating circuit;

Second resistance, it is coupled to this second output terminal of described voltage-regulating circuit;

One toggle switch, it has a plurality of first ends, a plurality of second end and a plurality of switch, and wherein said a plurality of first ends all are coupled to described second resistance, and described a plurality of switches are in order to select to couple a plurality of first ends and a plurality of second end; And

A plurality of the 3rd resistance, it is coupled to a plurality of second ends of described toggle switch.

5. voltage transitions card as claimed in claim 4, wherein said a plurality of the 3rd resistance comprise variable resistor at least.

6. voltage transitions card as claimed in claim 1, wherein said first slot is the PCI slot.

7. voltage transitions card as claimed in claim 1, wherein said second slot is the PCI slot.

8. voltage transitions card as claimed in claim 1, the voltage of wherein said first voltage source are 5 volts.

9. voltage transitions card as claimed in claim 1, the voltage of wherein said second voltage source are 3 volts.

10. voltage transitions card that is applicable to motherboard, this motherboard has one first slot so that first voltage source to be provided, and comprises at least:

One second slot;

A plurality of pins are in order to insert described first slot;

One mu balanced circuit has a first input end, adjusts end and one first output terminal;

Wherein said first input end is coupled to described first voltage source by described a plurality of pins, and described first output terminal is coupled to described second slot, and exports one second voltage source;

First resistance, it is coupled between this adjustment end of this first input end of described mu balanced circuit and described mu balanced circuit; And

Second resistance, it is coupled to this adjustment end and an earthing potential of described mu balanced circuit.