CN1049776C - Amplifier with constant current and constant voltage feeding - Google Patents
Amplifier with constant current and constant voltage feeding Download PDFInfo
- Publication number
- CN1049776C CN1049776C CN95106914A CN95106914A CN1049776C CN 1049776 C CN1049776 C CN 1049776C CN 95106914 A CN95106914 A CN 95106914A CN 95106914 A CN95106914 A CN 95106914A CN 1049776 C CN1049776 C CN 1049776C
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- voltage
- operational amplifier
- resistance
- amplifier
- constant
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Abstract
The present invention relates to a constant current and constant voltage feeding amplifier which comprises an operational amplifier, a negative feedback loop and a positive feedback loop, wherein the positive feedback loop is formed by the series connection of a resistor, a voltage stabilizing tube and an RC wave filter in sequence, and a positive and a negative input terminals of the operational amplifier are respectively provided with input resistors connected with the ground. The constant current and constant voltage feeding amplifier can be realized by a common operational amplifier and has the advantages of simple circuit and convenient thick film integration. The present invention is suitable for active subscriber circuits of stored-program control exchangers.
Description
The present invention relates to a kind of amplifier with constant current and constant voltage feeding, particularly the constant-current and constant-voltage feeder system that uses of the active subscriber line circuit of SPC telephone exchange.
The feed system of the active subscriber line circuit of stored-program control exchange needs the constant current power supply when short-term, need constant voltage to power again during long line, also will export certain power by amplifier simultaneously.The subscriber line circuit design of satisfying above-mentioned requirements is toward very complicated.The circuit complexity not only makes the cost height, and is to have increased technology difficulty when adopting thick film technology to realize the subscriber line circuit microminaturization.In addition, in side circuit, also need consider the factor such as anti-forceful electric power impact, short-circuit protection characteristic of interface circuit.Existing amplifier with constant current and constant voltage feeding weak point is the circuit complexity, and the cost height also is unsuitable for making the thick film device.
The object of the present invention is to provide a kind of circuit simple, the amplifier with constant current and constant voltage feeding of function admirable.
The objective of the invention is that following technical scheme realizes: amplifier with constant current and constant voltage feeding of the present invention comprises by operational amplifier and negative feedback loop thereof and positive feedback loop and forming.AC signal V1 is by the inverting input of resistance R 3 input operational amplifiers, and degenerative resistance is R2; Two resistance R 4 of serial connection and R5 between operational amplifier inverting input and the normal phase input end, these two resistance connected node ground connection; Positive feedback loop is series resistor R1, voltage-stabiliser tube D1, resistance R 7 and R6 successively, and node A1 connecting resistance R8 is to power vd between voltage-stabiliser tube D1 and the resistance R 7; Node Aout is an output between resistance R 1 and the voltage-stabiliser tube D1.
In addition, voltage-stabiliser tube D1 goes up shunt capacitance C1; Connect capacitor C 2 between resistance R 6 and the R7 and constitute filter circuit.
By adopting such scheme, only just finished the change planes function of the required constant current that possesses in the interface circuit, constant-voltage feeding and amplification of program control effect with an operational amplifier, circuit is simple, cost is low, can also make the midget plant of thick filmization easily.
Below in conjunction with accompanying drawing and example the present invention is elaborated.
Fig. 1 is constant current of the present invention, the electrical schematic diagram of constant-voltage feeding amplifying device.
In accompanying drawing 1, the mark OPI that gives is an operational amplifier, and AC signal Vi sends into the inverting input of operational amplifier via resistance R 3.Resistance R 2 is negative feedback resistors.Series resistor R4 and R5 between the inverting input (-) of operational amplifier OPI and the normal phase input end (+), the node ground connection of these two resistance that is to say, resistance R 3 and R4 parallel connection.The positive feedback loop of operational amplifier OPI is by series resistor R1, voltage-stabiliser tube D1, resistance R 7 and R6 successively and constitute.Working power VD receives the node A1 of voltage-stabiliser tube D1 and resistance R 7 by resistance R 8.Output terminals A out is positioned at the node place of resistance R 1 and voltage-stabiliser tube D1.
In above-mentioned constant current of the present invention, the constant-voltage feeding amplifying device, operational amplifier OPI can use low voltage operational amplifier, for example LM1458, LM324 and transistor VMOS pipe etc. is formed the high pressure amplifier, also can directly use the high pressure amplifier, also can directly use the high pressure amplifier.In circuit,, should guarantee for keeping DC operation:
R2/ (R3//R4)=(R6+R7)/R5 exchanges multiplication factor.Stabling current is determined that by Vz/R1 this Vz is the voltage stabilizing value of voltage-stabiliser tube.The breakover point of constant current constant voltage is by the value decision of the voltage V1 of node A1.When transferring constant-voltage feeding to, the output V0=V1 of amplifier OPI, therefore, can be in predetermined dynamic range operate as normal.
The filter loop that the resistance R 6 of positive feedback loop, R7 and capacitor C 2 are formed, frequency response during the 300Hz frequency work that should guarantee to stipulate and phase response are within the limits prescribed.Certainly, filter also can be with secondary or multistage finishing.Be parallel with capacitor C 1 on the voltage-stabiliser tube D1, its capacity is about 0.1 μ F.And electric capacity be in order to reduce voltage-stabiliser tube D1 non-linear under critical voltage stabilizing state to exchanging Effect on Performance.The working power voltage VD of this device is generally-48V.
The proportionate relationship of being given by last formula as can be known.Will fight in the DC operation state of this device a little is V0=V1.Less as Rx, when being operated in constant current state, the current potential of V1 is V1=Aout-Vz.And Vz should be the voltage stabilizing value of regulation when the voltage-stabiliser tube conducting.At this moment V0=V1, so V0=Aout-Vz, so V0-Aout=-Vz is the electric current Vz/R1 that R1 flows through.It just in time is constant current value by the Vz regulation.When Rx is enough big, when the current potential of V1 was not influenced by Aout-Vz also, V1 became a constant magnitude of voltage, and this moment, V0 was also constant, and whole device becomes the constant voltage constant-voltage feeder apparatus.Transition between the two also can be explained with the constant current principle.But this moment, Vz presented a voltage status less than Vz because of operating current is very little.
Claims (4)
1, a kind of amplifier with constant current and constant voltage feeding, it comprises operational amplifier, negative feedback loop and regenerative circuit, it is characterized in that: AC signal (Vi) is added to the inverting input of above-mentioned operational amplifier through input resistance (R3); Serial connection two resistance (R4, R5) between the inverting input of above-mentioned operational amplifier and the normal phase input end, its intermediate node ground connection; Above-mentioned positive feedback loop is made of series resistance (R1) successively, voltage-stabiliser tube (D1) and filter, and is connected between the output and normal phase input end of above-mentioned operational amplifier; Output is positioned at the node of the negative pole end of resistance (R1) and voltage-stabiliser tube (D1); And working power (VD) is to be connected with the node of filter with voltage-stabiliser tube (D1) by resistance (R8).
2, amplifying device as claimed in claim 1 is characterized in that: above-mentioned filter is the above resistance-capacitance network of secondary.
3, amplifying device as claimed in claim 1 is characterized in that: above-mentioned voltage-stabiliser tube (D1) is parallel with electric capacity (C1).
4, amplifying device as claimed in claim 1 is characterized in that: above-mentioned operational amplifier is that the expansion by low voltage operational amplifier commonly used constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95106914A CN1049776C (en) | 1995-06-21 | 1995-06-21 | Amplifier with constant current and constant voltage feeding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95106914A CN1049776C (en) | 1995-06-21 | 1995-06-21 | Amplifier with constant current and constant voltage feeding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115920A CN1115920A (en) | 1996-01-31 |
| CN1049776C true CN1049776C (en) | 2000-02-23 |
Family
ID=5076116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95106914A Expired - Fee Related CN1049776C (en) | 1995-06-21 | 1995-06-21 | Amplifier with constant current and constant voltage feeding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1049776C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058119C (en) * | 1996-11-15 | 2000-11-01 | 刘海先 | Constant-current and constant-voltage feeder apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5266905A (en) * | 1992-05-29 | 1993-11-30 | Audio Research Corporation | Audio amplifier with amplified feedback |
| US5317277A (en) * | 1992-12-08 | 1994-05-31 | Doble Engineering Company | Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency |
-
1995
- 1995-06-21 CN CN95106914A patent/CN1049776C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5266905A (en) * | 1992-05-29 | 1993-11-30 | Audio Research Corporation | Audio amplifier with amplified feedback |
| US5317277A (en) * | 1992-12-08 | 1994-05-31 | Doble Engineering Company | Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1115920A (en) | 1996-01-31 |
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