CN102053643A - DC linear voltage-stabilizing power supply, and board card and computer using same - Google Patents
DC linear voltage-stabilizing power supply, and board card and computer using same Download PDFInfo
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- CN102053643A CN102053643A CN200910197962XA CN200910197962A CN102053643A CN 102053643 A CN102053643 A CN 102053643A CN 200910197962X A CN200910197962X A CN 200910197962XA CN 200910197962 A CN200910197962 A CN 200910197962A CN 102053643 A CN102053643 A CN 102053643A
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- effect transistor
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- operational amplifier
- field effect
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Abstract
The invention is suitable for the field of power supply designs, and provides a direct current (DC) linear voltage-stabilizing power supply, and a board card and a computer using the same. In the invention, a current detection resistor is adopted to equally distribute load current to a plurality of regulating field-effect tubes which are connected in parallel, so that a voltage conversion design under the condition of low difference between input voltage and output voltage can be realized, and the load capacity of the DC linear voltage-stabilizing power supply is improved.
Description
Technical field
The invention belongs to the power supply design field, relate in particular to a kind of direct current linear stabilized power supply and adopt integrated circuit board, the computing machine of this power supply.
Background technology
For electronic product, the quality of its power supply design is most important.For example, in the hardware design of integrated circuit board, the quality of power supply design has determined the stability of integrated circuit board.In the power supply design,, adopt linear power supply usually for the less device of power demand.Linear power supply has that cost is low, and noise is lower, and output voltage stabilization takies advantages such as the pcb board area is little.
Fig. 1 shows the circuit structure of the disclosed first kind of direct current linear stabilized power supply of prior art.This direct current linear stabilized power supply mainly comprises operational amplifier U1, field effect transistor Q1, and the reference voltage of R1, R2 composition.
The in-phase input end of operational amplifier U1 is received reference voltage, and its inverting input takes back from the output voltage terminal feedback.The output terminal of operational amplifier is received the grid G of field effect transistor Q1.The drain D of field effect transistor Q1 is connected with input voltage vin, and the output of field effect transistor Q1 source S is stabilized near the burning voltage the reference voltage.Operational amplifier U1 is by the conducting degree of adjusting field effect transistor Q1, thereby the difference that realizes output voltage V out and reference voltage is stabilized within the error range.
With the input voltage vin is 3.3V, the output voltage V out that needs is that 1.8V is an example, the course of work of this circuit is described: at first need reference voltage to be set to 1.8V, when output voltage terminal was higher than 1.8V, the voltage that this output voltage feeds back to the inverting input of operational amplifier also was higher than 1.8V.The voltage of the inverting input of operational amplifier is compared with the reference voltage of its in-phase input end, the two ends difference voltage is after relatively amplifying, make the voltage of operational amplifier output reduce, thereby cause the pressure drop of field effect transistor Q1 to become big, thereby output voltage is descended.Similarly, when output voltage was lower than 1.8V, operational amplifier made the voltage of operational amplifier output increase, thereby causes the pressure drop of field effect transistor Q1 to reduce by after the voltage swing that compares in-phase input end and inverting input, output voltage is raise.By the way, voltage is dynamically adjusted, make output voltage V out dynamically maintain near the reference voltage 1.8V (with the difference of reference voltage in error range).
Since the power consumption of field effect transistor Q1 equal input voltage vin and output voltage V out difference and the product of load current.Obviously, under the certain situation of the pressure reduction of input voltage vin and output voltage V out, load current is big more, and then the output power of direct current linear stabilized power supply is just big more, and simultaneously, loss is just big more in the power consumption of field effect transistor.Like this, the power consumption constraints that field effect transistor can be born the output power size of direct current linear stabilized power supply, thereby the peak power output of this direct current linear stabilized power supply is just less.
For the problems referred to above, prior art has proposed a solution.Consult Fig. 2, the circuit structure of the second kind of direct current linear stabilized power supply that provides for prior art.
The circuit unit that second kind of direct current linear stabilized power supply is actually two first kind of schemes is composed in series.Each independent circuit unit works alone separately.Adopt the bi-level treatment mode, the output voltage of first order circuit unit is as the input voltage of second level circuit unit.In this way, two field effect transistor have been shared the power consumption of 1 field effect transistor in first kind of mode jointly, thereby can make output power bigger.
But for the pressure drop between input voltage, the output voltage hour, the pressure drop of each field effect transistor is littler, and then conducting degree is just higher, requires higher to the output driving force of operational amplifier.And operational amplifier output driving force does not reach requirement sometimes, at this moment, can influence the stability of this direct current linear stabilized power supply.And, the Input voltage terminal of second level linear power supply directly is connected on the output terminal of first order linear power supply, therefore, the output of first order linear power supply has a significant impact the stability of second level output voltage, and the stability that causes whole series electrical origin system is not fine.
Summary of the invention
The object of the present invention is to provide a kind of direct current linear stabilized power supply, be intended to solve the stable imperfect problem of linear power supply of the prior art.
The present invention is achieved in that a kind of direct current linear stabilized power supply, and described direct current linear stabilized power supply comprises that 1 main power circuit reaches the M in parallel with described main power circuit from power circuit,
Described main power circuit comprises: operational amplifier U
1, field effect transistor Q
1, current sense resistor R
3,
Described operational amplifier U
1Input end link to each other described field effect transistor Q respectively with reference voltage end, output voltage terminal
1Grid and operational amplifier U
1Output terminal link to each other described field effect transistor Q
1Drain electrode link to each other described field effect transistor Q with Input voltage terminal
1Source electrode and current sense resistor R
3Output voltage terminal is received in series connection;
M comprises from power circuit: operational amplifier U
M+1, field effect transistor Q
M+1, current sense resistor R
M+3,
Described operational amplifier U
M+1Input end respectively with current sense resistor R
3, current sense resistor R
M+3Link to each other described field effect transistor Q
M+1Grid and operational amplifier U
M+1Output terminal link to each other described field effect transistor Q
M+1Drain electrode link to each other described field effect transistor Q with Input voltage terminal
M+1Source electrode and current sense resistor R
M+3Output voltage terminal is received in series connection,
Described M is a positive integer.
Further, described main power circuit also comprises the loop compensation element.
Further, described loop compensation element is an electric capacity, described electric capacity one end and operational amplifier U
1Output terminal link to each other the other end and operational amplifier U
1An input end link to each other.
Further, individual from power circuit at described M, have at least one from power circuit, to comprise the loop compensation element.
Further, described loop compensation element is an electric capacity, and an end of described electric capacity links to each other with the output terminal that belongs to same operational amplifier from power circuit, and the other end links to each other with an input end of this operational amplifier.
Further, the field effect transistor Q of described main power circuit
1Be N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
Further, described field effect transistor Q from power circuit
MBe N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
Further, the current sense resistor of described main power circuit, described M all equate from the resistance of the current sense resistor of power circuit.
Another object of the present invention is to provide a kind of integrated circuit board, described integrated circuit board adopts above-mentioned direct current linear stabilized power supply.
Another object of the present invention is to provide a kind of computing machine, described computing machine adopts above-mentioned integrated circuit board.
Among the present invention, adopt current sense resistor to realize a plurality of adjustment field effect transistor mean allocation load currents in parallel, can realize the voltage transitions design under the lower situation of input voltage and output voltage pressure reduction, improve the carrying load ability of direct current linear stabilized power supply.By adding the loop compensation element, further improve the stability of direct current linear stabilized power supply.
Description of drawings
Fig. 1 is the circuit structure diagram of first kind of direct current linear stabilized power supply providing of prior art;
Fig. 2 is the circuit structure diagram of second kind of direct current linear stabilized power supply providing of prior art;
Fig. 3 is the structural representation of the direct current linear stabilized power supply that provides of first embodiment of the invention;
Fig. 4 is the structural representation of the direct current linear stabilized power supply that provides of second embodiment of the invention;
Fig. 5 is the structural representation of the direct current linear stabilized power supply that provides of third embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the present invention, adopt current sense resistor to realize a plurality of adjustment field effect transistor mean allocation load currents in parallel, can realize the voltage transitions design under the lower situation of input voltage and output voltage pressure reduction, improve the carrying load ability of direct current linear stabilized power supply.
Fig. 3 shows the structure of the direct current linear stabilized power supply that first embodiment of the invention provides, and this first embodiment mainly is formed in parallel from power circuit by a main power circuit and one.
The main components and parts of this embodiment comprise operational amplifier U1, U2, field effect transistor Q1, Q2, and current sense resistor R3, R4, and the reference voltage of forming by R1, R2, the capacitor C 1 among the figure, C2 is as the loop compensation element.
Wherein, operational amplifier U1, field effect transistor Q1, current sense resistor R3 and capacitor C 1 constitute main power circuit.Operational amplifier U2, field effect transistor Q2, current sense resistor R4 and capacitor C 2 constitute from power circuit.R3, R4 are the current sense resistor (for reducing loss, can select resistance is the precision resistance of milliohm level) that resistance equates.
In the main power circuit, the in-phase input end of operational amplifier U1 connects reference voltage (for example, need output 1.5V voltage, then reference voltage is made as 1.5V).The inverting input of operational amplifier U1 takes back from the output voltage terminal feedback.The grid G of the output termination field effect transistor Q1 of operational amplifier U1.The drain D of field effect transistor Q1 meets Input voltage terminal Vin.Output voltage terminal Vout is received in the source S of field effect transistor Q1 and current sense resistor R3 series connection.
Main power circuit is regulated the conducting degree of field effect transistor Q1 by operational amplifier U1, thereby dynamically adjusts output voltage stabilization near reference voltage.If when output voltage is higher than reference voltage, the voltage that thereupon feeds back to the inverting input of operational amplifier U1 also increases simultaneously.The feedback voltage of the inverting input of operational amplifier is compared with the reference voltage of operational amplifier in-phase input end, and the voltage of inverting input is greater than the reference voltage of in-phase input end.Its difference voltage makes the voltage of operational amplifier output reduce after relatively amplifying, thereby causes the pressure drop of field effect transistor Q1 to become big, and output voltage is descended.In like manner, when output voltage was lower than reference voltage, operational amplifier made the voltage of operational amplifier output increase, thereby causes the pressure drop of field effect transistor Q1 to reduce by after the voltage swing that compares in-phase input end and inverting input, output voltage is raise.
From power circuit, the in-phase input end of operational amplifier U2 meets the VCC1 place, the inverting input of operational amplifier U2 meets the VCC2 place, the grid S of the output termination field effect transistor Q2 of operational amplifier, the drain D of field effect transistor Q2 meets Input voltage terminal Vin, and just the drain D with field effect transistor Q1 is connected together.Output voltage terminal Vout is received in the source S of field effect transistor Q2 and current sense resistor R4 series connection.
Similar with main power circuit, by the conducting degree that operational amplifier U2 regulates field effect transistor Q2, realize that the voltage at VCC2 place is consistent with the voltage at VCC1 place from power circuit.
Because the voltage at VCC1 place equates with the voltage at VCC2 place,, because select R3, R4 resistance to equate, equate with the electric current that flows through R4 again, thereby the electric current that flows through two field effect transistor Q1, Q2 equates so flow through the electric current of R3 so the voltage at R3, R4 two ends is equal.Like this, just realize two linear power supply current-sharings in parallel, also just made power averaging be distributed on two field effect transistor.By the form of principal and subordinate's power supply parallel connection, this circuit structure can be realized input voltage and output voltage pressure reduction is very little but voltage transitions that load current is bigger.Simultaneously, adopt this principal and subordinate's power supply parallel-connection structure, make guaranteeing that input voltage under the situation of having only one-level between the output voltage, has improved the power of linear power supply, the form that output voltage is connected relatively is more stable.
As embodiments of the invention, field effect transistor can be N channel field-effect pipe, also can be the P-channel field-effect transistor (PEFT) pipe.Consult Fig. 4, be the structure of second embodiment of the invention, when promptly adopting the P-channel field-effect transistor (PEFT) pipe, the structure of stabilized voltage supply.At this moment, reference voltage connects the inverting input of operational amplifier U1.The in-phase input end of operational amplifier U1 takes back from the output voltage terminal feedback.In like manner, also reversal connection of operational amplifier U2.Similar among its circuit theory and first embodiment, therefore, this place repeats no more.
Fig. 5 shows the structure of the direct current linear stabilized power supply that third embodiment of the invention provides.In the explanation of above scheme, just at the situation of two field effect transistor parallel connections, i.e. 1 main power circuit, 1 from power circuit.With reference to figure 5, be three field effect transistor circuit structures when in parallel, i.e. 1 main power circuit, 2 from power circuit.
Main power circuit principle of work in main power circuit principle of work and the first embodiment of the invention is similar.Main power circuit is regulated the conducting degree of field effect transistor Q1 by operational amplifier U1, thereby dynamically adjusts output voltage stabilization near reference voltage.In the main power circuit of present embodiment, can increase by a capacitor C 1 as the ring compensating element.
Two structures from power circuit are identical, and first comprises from power circuit: operational amplifier U2, field effect transistor Q2, current sense resistor R4, capacitor C 2.The input end of this operational amplifier U2 links to each other with current sense resistor R3, current sense resistor R4 respectively.The grid of this field effect transistor Q2 links to each other with the output terminal of operational amplifier U2, and the drain electrode of this field effect transistor Q2 links to each other with Input voltage terminal Vin, and the source electrode of this field effect transistor Q2 is connected with current sense resistor R4 and received output voltage terminal Vout.From power circuit, can increase by a capacitor C 2 at first of present embodiment as the ring compensating element,s.
Similarly, second comprises from power circuit: operational amplifier U3, field effect transistor Q3, current sense resistor R5, capacitor C 3.The input end of this operational amplifier U3 links to each other with current sense resistor R3, current sense resistor R5 respectively.The grid of this field effect transistor Q3 links to each other with the output terminal of operational amplifier U3, and the drain electrode of this field effect transistor Q3 links to each other with Input voltage terminal Vin, and the source electrode of this field effect transistor Q3 is connected with current sense resistor R5 and received output voltage terminal Vout.From power circuit, can increase by a capacitor C 3 second of present embodiment as the ring compensating element,s.
By the flow equalize technology in the scheme above with the electric current mean allocation of integral body on three field effect transistor, further improved the output power of power supply.
Similarly, this direct current linear stabilized power supply can also comprise more from power circuit.To its structure, can be summarized as follows: this direct current linear stabilized power supply comprises that 1 main power circuit reaches the M in parallel with this main power circuit from power circuit, and M is a positive integer.This main power circuit comprises operational amplifier U
1, field effect transistor Q
1, current sense resistor R
3, this operational amplifier U
1Input end link to each other this field effect transistor Q with reference voltage end (R1, R2 have formed reference voltage), output voltage terminal Vout respectively
1Grid and operational amplifier U
1Output terminal link to each other this field effect transistor Q
1Drain electrode link to each other this field effect transistor Q with Input voltage terminal Vin
1Source electrode and current sense resistor R
3Output voltage terminal is received in series connection.
M comprises from power circuit: operational amplifier U
M+1, field effect transistor Q
M+1, current sense resistor R
M+3This operational amplifier U
M+1Input end respectively with current sense resistor R
3, current sense resistor R
M+3Link to each other this field effect transistor Q
M+1Grid and operational amplifier U
M+1Output terminal link to each other this field effect transistor Q
M+1Drain electrode link to each other this field effect transistor Q with Input voltage terminal
M+1Source electrode and current sense resistor R
M+3Output voltage terminal is received in series connection.
In order further to improve the stability of direct current linear stabilized power supply, as embodiments of the invention, this main power circuit can also comprise the loop compensation element.And, can adopt electric capacity as the loop compensation element, with electric capacity one end and operational amplifier U
1Output terminal link to each other the other end and operational amplifier U
1An input end link to each other (when adopting N channel field-effect pipe, the other end of electric capacity and operational amplifier U
1Inverting input link to each other, when adopting the P-channel field-effect transistor (PEFT) pipe, the other end of electric capacity and operational amplifier U
1In-phase input end link to each other).Similarly, also can from power circuit, increase the loop compensation element at one or more.
In an embodiment of the present invention, the field effect transistor that is adopted can be N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
In order to make a plurality of field effect transistor divide equally power consumption,, the current sense resistor of main power circuit, all resistances from the current sense resistor of power circuit are all equated as embodiments of the invention.
In actual applications, integrated circuit board can adopt this direct current linear stabilized power supply design.Certainly, above-mentioned integrated circuit board can be applicable to computing machine.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a direct current linear stabilized power supply is characterized in that, described direct current linear stabilized power supply comprises that 1 main power circuit reaches the M in parallel with described main power circuit from power circuit,
Described main power circuit comprises: operational amplifier U
1, field effect transistor Q
1, current sense resistor R
3,
Described operational amplifier U
1Input end link to each other described field effect transistor Q respectively with reference voltage end, output voltage terminal
1Grid and operational amplifier U
1Output terminal link to each other described field effect transistor Q
1Drain electrode link to each other described field effect transistor Q with Input voltage terminal
1Source electrode and current sense resistor R
3Output voltage terminal is received in series connection;
M comprises from power circuit: operational amplifier U
M+1, field effect transistor Q
M+1, current sense resistor R
M+3,
Described operational amplifier U
M+1Input end respectively with current sense resistor R
3, current sense resistor R
M+3Link to each other described field effect transistor Q
M+1Grid and operational amplifier U
M+1Output terminal link to each other described field effect transistor Q
M+1Drain electrode link to each other described field effect transistor Q with Input voltage terminal
M+1Source electrode and current sense resistor R
M+3Output voltage terminal is received in series connection,
Described M is a positive integer.
2. direct current linear stabilized power supply as claimed in claim 1 is characterized in that described main power circuit also comprises the loop compensation element.
3. direct current linear stabilized power supply as claimed in claim 2 is characterized in that, described loop compensation element is an electric capacity, described electric capacity one end and operational amplifier U
1Output terminal link to each other the other end and operational amplifier U
1An input end link to each other.
4. direct current linear stabilized power supply as claimed in claim 1 is characterized in that, and is individual from power circuit at described M, has at least one to comprise the loop compensation element from power circuit.
5. direct current linear stabilized power supply as claimed in claim 4, it is characterized in that, described loop compensation element is an electric capacity, and an end of described electric capacity links to each other with the output terminal that belongs to same operational amplifier from power circuit, and the other end links to each other with an input end of this operational amplifier.
6. direct current linear stabilized power supply as claimed in claim 1 is characterized in that, the field effect transistor Q of described main power circuit
1Be N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
7. direct current linear stabilized power supply as claimed in claim 1 is characterized in that, described field effect transistor Q from power circuit
MBe N channel field-effect pipe or P-channel field-effect transistor (PEFT) pipe.
8. direct current linear stabilized power supply as claimed in claim 1 is characterized in that, the current sense resistor of described main power circuit, described M all equate from the resistance of the current sense resistor of power circuit.
9. an integrated circuit board is characterized in that, described integrated circuit board adopts each described direct current linear stabilized power supply in the claim 1 to 8.
10. a computing machine is characterized in that, described computing machine adopts the described integrated circuit board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910197962XA CN102053643A (en) | 2009-10-30 | 2009-10-30 | DC linear voltage-stabilizing power supply, and board card and computer using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910197962XA CN102053643A (en) | 2009-10-30 | 2009-10-30 | DC linear voltage-stabilizing power supply, and board card and computer using same |
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| Publication Number | Publication Date |
|---|---|
| CN102053643A true CN102053643A (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910197962XA Pending CN102053643A (en) | 2009-10-30 | 2009-10-30 | DC linear voltage-stabilizing power supply, and board card and computer using same |
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| CN (1) | CN102053643A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064352A (en) * | 2019-12-21 | 2020-04-24 | 苏州浪潮智能科技有限公司 | Circuit structure for realizing active current sharing of parallel field effect transistors |
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2009
- 2009-10-30 CN CN200910197962XA patent/CN102053643A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064352A (en) * | 2019-12-21 | 2020-04-24 | 苏州浪潮智能科技有限公司 | Circuit structure for realizing active current sharing of parallel field effect transistors |
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Application publication date: 20110511 |