CN207249521U - Adjustable linear voltage-stabilized power supply circuit - Google Patents
Adjustable linear voltage-stabilized power supply circuit Download PDFInfo
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- CN207249521U CN207249521U CN201720267036.5U CN201720267036U CN207249521U CN 207249521 U CN207249521 U CN 207249521U CN 201720267036 U CN201720267036 U CN 201720267036U CN 207249521 U CN207249521 U CN 207249521U
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- resistance
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- operational amplifier
- circuit
- digital regulation
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Abstract
The utility model discloses adjustable linear voltage-stabilized power supply circuit,Including initial baseline voltage generation circuit,Reference voltage regulating circuit and voltage amplification regulator circuit,The reference voltage regulating circuit includes micro-control circuit unit and digital regulation resistance D2,The micro-control circuit unit is connected with digital regulation resistance D2,The micro-control circuit unit is used to control digital regulation resistance D2 to adjust voltage output,And the output terminal of the operational amplifier D1 in initial baseline voltage generation circuit is connected with digital regulation resistance D2 and provides reference voltage value for it,And the voltage output end of the digital regulation resistance D2 in the reference voltage regulating circuit is connected with the input terminal of voltage amplification regulator circuit,The voltage amplification regulator circuit is used to amplify the output voltage of digital regulation resistance and exports stable voltage,The power circuit can not only export stable linear voltage,And output voltage range is wide,It is easy to adjust.
Description
Technical field
It the utility model is related to voltage stabilizing technique, more particularly to a kind of adjustable linear voltage-stabilized power supply circuit.
Background technology
At present, known tandem type linear voltage-stabilized power supply circuit is amplified by adjusting pipe, reference voltage, sample circuit, error
Several essential part compositions such as circuit.Sample resistance is by sampling output voltage, and compared with reference voltage, and comparative result is by by mistake
After poor amplifying circuit amplification, the conducting degree of control adjustment pipe, makes output voltage keep stablizing.Regulated power supply output voltage exports
Scope is realized by the adjustment of sample resistance, and reference voltage is constant.But it is wider in output voltage range,
It is constant using reference voltage in the case that electric current is bigger, the adjustment of sample resistance is depended merely on to realize that output voltage range is big
Mode can bring larger error.
Utility model content
The purpose of this utility model is to provide a kind of wide adjustable linear voltage-stabilizing circuit of output voltage range, can not only export
Stable linear voltage, and output voltage range is wide, it is easy to adjust.
To achieve these goals, the technical scheme adopted by the utility model is that：Adjustable linear voltage-stabilized power supply circuit, including
Initial baseline voltage generation circuit, reference voltage regulating circuit and voltage amplification regulator circuit, the initial baseline voltage produce
It is electric using list that circuit includes resistance R1, resistance R2, resistance R3, voltage-stabiliser tube V3 and operational amplifier D1, the operational amplifier D1
Source powers, described resistance R1 one end ground connection, and the inverting input with operational amplifier D1, voltage-stabiliser tube V3 be just respectively for its other end
Pole connects, and the anode of the voltage-stabiliser tube V3 is connected with the output terminal of operational amplifier D1, and one end ground connection of the resistance R2, its is another
The in-phase input end with operational amplifier D1, one end of resistance R3 are connected respectively for one end, and the resistance R3 other ends are put with computing
The output terminal connection of big device D1, the reference voltage regulating circuit includes micro-control circuit unit and digital regulation resistance D2, described
Micro-control circuit unit is connected with digital regulation resistance D2, and the micro-control circuit unit is used to control digital regulation resistance D2 to adjust electricity
Pressure output, and the output terminal of the operational amplifier D1 in initial baseline voltage generation circuit is connected with digital regulation resistance D2 and is it
Reference voltage value is provided, and the voltage output end of the digital regulation resistance D2 in the reference voltage regulating circuit and voltage amplification are steady
The input terminal connection of volt circuit, the voltage amplification regulator circuit are used to amplify the output voltage of digital regulation resistance and export steady
Constant voltage value.
Further, the voltage amplification regulator circuit includes operational amplifier D3, high power transistor V1, high-power crystalline substance
Body pipe V2, adjustable resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and resistance R9, in the reference voltage regulating circuit
The potentiometer adjustment end of digital regulation resistance D2 be connected with the in-phase input end of operational amplifier D3, the operational amplifier D3 tools
A potentiometer R4 is connected for two zeroing pins and between this two pins that return to zero, the adjustment end of the potentiometer R4 passes through
Resistance R5 is connected to the negative power end of operational amplifier D3, and the negative power end of the operational amplifier D3 is used to connect negative supply,
The positive power source terminal of the operational amplifier D3 is used to connect positive supply, the output terminal of the operational amplifier D3 through resistance R8 with
The base stage connection of high power transistor V2, the high power transistor V1 are connected and are used for the collector of high power transistor V2
Positive supply is connected, the emitter of the high power transistor V2 is connected with the base stage of high power transistor V1, the high-power crystalline substance
The emitter and resistance R7 one end that resistance R9, the high power transistor V1 are connected between the base stage and emitter of body pipe V1 connect
Connect, the other end of the resistance R7 is connected with one end of the inverting input of operational amplifier D3, resistance R6, the resistance R6's
The other end is grounded, and the voltage output end of adjustable linear stabilized power supply is drawn from the emitter of the high power transistor V1.
Further, the voltage amplification regulator circuit include capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5 and
Anti-reverse diode V4, one end of the capacitance C1 are connected with the in-phase input end of operational amplifier D3, its other end ground connection, institute
State capacitance C2 to be connected between the output terminal and inverting input of operational amplifier D3, the capacitance C3 is in parallel with resistance R7, institute
The collector that capacitance C4 one end is connected to high power transistor V2 is stated, its other end ground connection, described capacitance C5 one end is connected to greatly
The emitter connection of power transistor V1, its other end ground connection, the cathode and high power transistor of the anti-reverse diode V4
The emitter connection of V1, the anode of the anti-reverse diode V4 is connected with the output terminal of operational amplifier D3, by setting electricity
Hold C1-C5 with stabilized power source input and output.
Further, the micro-control circuit unit includes microcontroller, crystal oscillating circuit unit, push-button unit and capacitance-resistance member
Part, crystal oscillating circuit unit, push-button unit and the Resistor-Capacitor Unit are connected with the pin of microcontroller respectively.Singlechip group into micro-control
Circuit unit processed is simple in structure, and cost is low, and function is strong,
Further, the digital regulation resistance uses 7 non-volatile digital electricity of the model DS3501 of company of Dallas
Position device.
Compared with prior art, the beneficial effects of the utility model are：After initial baseline voltage generation circuit reaches stable
Export and be equal to the voltage stabilizing value of 2 times of voltage-stabiliser tube V3 for a stable voltage, the size of its value, reference voltage regulating circuit includes number
Word potentiometer D2 and singlechip group into micro-control circuit unit, microcontroller is connected with digital regulation resistance D2 using I2C interface, real
Now facilitate, the adjustment of accurate reference voltage, reference voltage adjusting range is the voltage stabilizing value of 0~2 times of voltage-stabiliser tube, the benchmark after adjustment
Voltage is carried out with mutually amplifying by operational amplifier D3, and 3 times of amplification factor, in order to improve the carrying load ability of circuit, computing is put
Big two cascade high power transistors of device D3 outputs connection produce stable output voltage, adjustable linear stabilized power supply output voltage
Scope be 0~6 times of voltage-stabiliser tube voltage stabilizing value, if voltage-stabiliser tube voltage stabilizing value is 5.6V, its export voltage of voltage regulation scope ensure can
Reach 0~30V, realize wide voltage adjusting range, two cascade high power transistor base stages are connected to operational amplifier D3
Output terminal, output voltage are drawn from the emitter-base bandgap grading of cascade high power transistor, and high power transistor is operated in magnifying state, adopts
The output terminal exported with emitter-base bandgap grading is connected by feedback resistance with operational amplification circuit inverting input, and emitter-base bandgap grading exports and with phase computing
Amplifying circuit has input impedance height, the low feature of output impedance, thus has fabulous carrying load ability, when output voltage adjusts
After good, diminish as loaded, because output voltage is constant, thus high power transistor will improve its Current amplifier ability, real
Existing voltage stabilizing.The output voltage of linear stabilized power supply can be adjusted interior on a large scale, while also have precision height, temperature characterisitic
Good, output voltage adjusts the characteristics of flexible.
Brief description of the drawings
Fig. 1 show the circuit diagram of the utility model.
Embodiment
The preferred embodiment of the utility model is illustrated below in conjunction with attached drawing, it will be appreciated that described herein excellent
Select embodiment to be only used for describing and explaining the present invention, be not used to limit the utility model.
With reference to figure 1, adjustable linear voltage-stabilized power supply circuit, including initial baseline voltage generation circuit, reference voltage adjustment electricity
Road and voltage amplification regulator circuit, the initial baseline voltage generation circuit include resistance R1, resistance R2, resistance R3, voltage-stabiliser tube
V3 and operational amplifier D1, the operational amplifier D1 are powered using single supply, resistance R1 one end ground connection, its other end point
Inverting input, the cathode of voltage-stabiliser tube V3 not with operational amplifier D1 are connected, the anode and operation amplifier of the voltage-stabiliser tube V3
Device D1 output terminal connection, the resistance R2 one end ground connection, its other end respectively the in-phase input end with operational amplifier D1,
One end connection of resistance R3, the resistance R3 other ends are connected with the output terminal of operational amplifier D1, the reference voltage adjustment
Circuit includes micro-control circuit unit and digital regulation resistance D2, the micro-control circuit unit are connected with digital regulation resistance D2, institute
Micro-control circuit unit is stated to be used to control digital regulation resistance D2 to adjust reference voltage output, and in initial baseline voltage generation circuit
The output terminal of operational amplifier D1 be connected with digital regulation resistance D2 and provide reference voltage value for it, and the reference voltage tune
The potentiometer adjustment end of digital regulation resistance D2 in whole circuit is connected with the input terminal of voltage amplification regulator circuit, and the voltage is put
Big regulator circuit is used to amplify the output voltage of digital regulation resistance and exports stable voltage.Operational amplifier D1 is preferably adopted
With the mono- operational amplifiers of OP15, single supply power supply, just having powered on voltage-stabiliser tube V3 cannot work, and operational amplifier D1 output voltages U1 is opened
Begin increase, when reaching the nominal voltage stabilizing value VZ of voltage-stabiliser tube V3, circuit reaches stable, and at this moment the voltage at resistance R3 both ends is also VZ,
The characteristics of breaking due to operational amplifier void, the in-phase end pin electric current for flowing through operational amplifier D1 can be neglected, therefore flow through R2, R3
Electric current be the same, if the resistance value of R2 is equal with the resistance value of R3, U1 voltages remain unchanged:U1=2 × VZ, circuit generation
Initial baseline voltage 2VZ.The micro-control circuit unit include microcontroller D4, crystal oscillating circuit unit B 1, push-button unit S1 and
Resistor-Capacitor Unit, crystal oscillating circuit unit, push-button unit and the Resistor-Capacitor Unit are connected with the pin of microcontroller to form one respectively
Microcontroller micro-control circuit unit.Digital regulation resistance D2 uses 7 non-volatile digital potentiometer DS3501 of company of Dallas,
DS3501 digital regulation resistances fixed resistance value is 10K Ω, and the change rate of resistance isDevice has the output electricity of up to 15.5V
Pressure, the 6th, the 9 two pin short circuit of digital regulation resistance D2 are simultaneously connected to the output terminal of operational amplifier D1, and microcontroller D4 is used
The pin 22,23 of Atmeag16L of the atmel corp with I2C interface, microcontroller D4 are with the pin 1,10 of D2 according to I2C definition connects
Connect, microcontroller uses I2C interface controls digital regulation resistance D2 change in resistance, and the pin 6 of digital regulation resistance D2 hinders for adjustable resistance
It is worth fixing end RH, is connected to operational amplifier D1 output pins 6, the pin 8 of digital regulation resistance D2 is fixed for adjustable resistance resistance value
RL is held, is connected to the ground, 7 end of digital regulation resistance D2 pins is adjustable resistance resistance value adjustment end RW, voltage U2Size by digital electricity
The intrinsic standoff ratio of position device D2Control, according to Fig. 1 connection relations, RL=0 Ω, RH=10K Ω,Change RW and change U2, so as to fulfill the adjustment of reference voltage.Carry out voltage
During adjustment, often by one-touch, RW increasesBy n times buttonN maximum occurrences 127, RW
It is up to 10K Ω, is adjusted by button and U can be achieved2Excursion is 0V-2VZ, U2Maximum U2MAXIt is 2VZ.Reference voltage tune
For whole circuit using numeral current potential DS3501 (D2), DS3501 is a 7, non-volatile (NV) digital regulation resistance, is had up to
15.5V output voltage range.Microcontroller passes through I2C compatibility interfaces carry out it programming, and interfaces speed may be up to
400kHz.The minimum and maximum output voltage of potentiometer can be limited by being applied to the external voltage of RL and RH input terminals.
DS3501 includes a built-in temperature sensor and associated analog-digital converter (ADC), using the teaching of the invention it is possible to provide the temperature of any slope
Compensate output voltage, good temp characteristic, Adjustment precision height.
The voltage amplification regulator circuit include operational amplifier D3, high power transistor V1, high power transistor V2, can
Adjust resistance R4, resistance R5, resistance R6, resistance R7, resistance R8 and resistance R9, the digital current potential in the reference voltage regulating circuit
The voltage output end of device D2 is connected with the in-phase input end of operational amplifier D3, and the operational amplifier D3 possesses two zeroing pipes
Foot and a potentiometer R4 is connected between this two pins that return to zero, the adjustment end of the potentiometer R4 is connected to by resistance R5
The negative power end of operational amplifier D3, the negative power end of the operational amplifier D3 are used to connect negative supply, the operation amplifier
The positive power source terminal of device D3 is used to connect positive supply, and the output terminal of the operational amplifier D3 is through resistance R8 and high power transistor V2
Base stage connection, the high power transistor V1 connects with the collector of high power transistor V2 and is used to connect positive supply, institute
The emitter for stating high power transistor V2 is connected with the base stage of high power transistor V1, the base stage of the high power transistor V1 and
The emitter that resistance R9, the high power transistor V1 are connected between emitter is connected with resistance R7 one end, the resistance R7's
The other end is connected with the inverting input of operational amplifier D3, one end of resistance R6, the other end ground connection of the resistance R6, from institute
The emitter for stating high power transistor V1 draws the voltage output end of adjustable linear stabilized power supply.
For stabilized power source input and output, the voltage amplification regulator circuit includes capacitance C1, capacitance C2, capacitance C3, electricity
Hold C4, capacitance C5 and anti-reverse diode V4, one end of the capacitance C1 to be connected with the in-phase input end of operational amplifier D3,
Its other end is grounded, and the capacitance C2 is connected between the output terminal and inverting input of operational amplifier D3, the capacitance C3
In parallel with resistance R7, described capacitance C4 one end is connected to the collector of high power transistor V2, its other end ground connection, the capacitance
C5 one end is connected to the emitter connection of high power transistor V1, its other end ground connection, the cathode of the anti-reverse diode V4
It is connected with the emitter of high power transistor V1, the anode of the anti-reverse diode V4 connects with the output terminal of operational amplifier D3
Connect.
Operational amplifier D3 uses the mono- operational amplifiers of OP15, dual power supply, and operational amplifier D3, which is operated in, mutually to be put together
Big state, its amplification factor are determined by resistance R6, resistance R7, and one is connected between the pin 1, pin 5 in operational amplifier D3
The adjustment end of potentiometer R4, R4 are connected to the negative power end of operational amplifier D3 by resistance R5, and adjustment potentiometer R4 ensures defeated
It is 0V to go out voltage Vout minimum voltages.High power transistor V1, high power transistor V2 use 2n3305 high power transistors,
V1, V2 connect into Darlington transistor form, ensure that V1, V2 are operated in magnifying state.The output voltage of adjustable linear stabilized power supply
Vout is drawn by the emitter of high power transistor V1, and the backward end of in-phase amplifier is fed back to by resistance R7, resistance R6,
Increase the carrying load ability of circuit and the stabilization of output voltage.Resistance R7 values are twice of resistance R6 in circuit, then output voltageRealize output voltage maximum VOUTmax=3U2max=3 × 2VZ=6VZ。
Finally it should be noted that the above descriptions are merely preferred embodiments of the present invention, this is not limited to
Utility model, where within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on, should all wrap
It is contained within the scope of protection of the utility model.
Claims (5)
1. adjustable linear voltage-stabilized power supply circuit, it is characterized in that, including initial baseline voltage generation circuit, reference voltage regulating circuit
And voltage amplification regulator circuit, the initial baseline voltage generation circuit include resistance R1, resistance R2, resistance R3, voltage-stabiliser tube V3
And operational amplifier D1, the operational amplifier D1 are powered using single supply, resistance R1 one end ground connection, its other end difference
Inverting input, the cathode of voltage-stabiliser tube V3 with operational amplifier D1 are connected, the anode and operational amplifier of the voltage-stabiliser tube V3
The output terminal connection of D1, one end ground connection of the resistance R2, its other end in-phase input end with operational amplifier D1, electricity respectively
One end connection of R3 is hindered, the resistance R3 other ends are connected with the output terminal of operational amplifier D1, the reference voltage adjustment electricity
Road includes micro-control circuit unit and digital regulation resistance D2, and the micro-control circuit unit is connected with digital regulation resistance D2, described
Micro-control circuit unit is used to control digital regulation resistance D2 to adjust reference voltage output, and in initial baseline voltage generation circuit
The output terminal of operational amplifier D1 is connected with digital regulation resistance D2 and provides reference voltage value for it, and the reference voltage adjusts
The potentiometer adjustment end of digital regulation resistance D2 in circuit is connected with the input terminal of voltage amplification regulator circuit, the voltage amplification
Regulator circuit is used to amplify the output voltage of digital regulation resistance D2 and exports stable voltage.
2. adjustable linear voltage-stabilized power supply circuit as claimed in claim 1, it is characterized in that, the voltage amplification regulator circuit includes
Operational amplifier D3, high power transistor V1, high power transistor V2, adjustable resistance R4, resistance R5, resistance R6, resistance R7, electricity
R8 and resistance R9 is hindered, the voltage output end of the digital regulation resistance D2 in the reference voltage regulating circuit is with operational amplifier D3's
In-phase input end connects, and the operational amplifier D3 possesses two zeroing pins and connects one between this two pins that return to zero
The adjustment end of potentiometer R4, the potentiometer R4 are connected to the negative power end of operational amplifier D3, the computing by resistance R5
The negative power end of amplifier D3 is used to connect negative supply, and the positive power source terminal of the operational amplifier D3 is used to connect positive supply, institute
The output terminal for stating operational amplifier D3 is connected through resistance R8 with the base stage of high power transistor V2, the high power transistor V1 and
The collector of high power transistor V2 connects and is used to connect positive supply, the emitter of the high power transistor V2 with it is high-power
The base stage connection of transistor V1, connection resistance R9, described high-power between the base stage and emitter of the high power transistor V1
The emitter of transistor V1 is connected with resistance R7 one end, the other end of the resistance R7 and the anti-phase input of operational amplifier D3
End, one end connection of resistance R6, the other end ground connection of the resistance R6, being drawn from the emitter of the high power transistor V1 can
Adjust the voltage output end of linear stabilized power supply.
3. adjustable linear voltage-stabilized power supply circuit as claimed in claim 2, it is characterized in that, the voltage amplification regulator circuit includes
Capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5 and anti-reverse diode V4, one end of the capacitance C1 and operation amplifier
The in-phase input end connection of device D3, its other end ground connection, the capacitance C2 are connected to the output terminal of operational amplifier D3 and anti-phase
Between input terminal, the capacitance C3 is in parallel with resistance R7, and described capacitance C4 one end is connected to the collector of high power transistor V2,
Its other end is grounded, and described capacitance C5 one end is connected with the emitter of high power transistor V1, its other end ground connection, the counnter attack
The cathode for meeting diode V4 is connected with the emitter of high power transistor V1, and the anode of the anti-reverse diode V4 is put with computing
The output terminal connection of big device D3.
4. the adjustable linear voltage-stabilized power supply circuit as described in claim 1-3 any one, it is characterized in that, the micro-control circuit
Unit includes microcontroller, crystal oscillating circuit unit, push-button unit and Resistor-Capacitor Unit, crystal oscillating circuit unit, push-button unit and the resistance
Hold element to be connected with the pin of microcontroller respectively.
5. adjustable linear voltage-stabilized power supply circuit as claimed in claim 4, it is characterized in that, the digital regulation resistance uses Dallas
7 non-volatile digital potentiometers of the model DS3501 of company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720267036.5U CN207249521U (en) | 2017-03-17 | 2017-03-17 | Adjustable linear voltage-stabilized power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720267036.5U CN207249521U (en) | 2017-03-17 | 2017-03-17 | Adjustable linear voltage-stabilized power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207249521U true CN207249521U (en) | 2018-04-17 |
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ID=61874793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720267036.5U Expired - Fee Related CN207249521U (en) | 2017-03-17 | 2017-03-17 | Adjustable linear voltage-stabilized power supply circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN207249521U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112527040A (en) * | 2020-11-25 | 2021-03-19 | 合肥同智机电控制技术有限公司 | Linear voltage stabilizing circuit |
| CN114362528A (en) * | 2021-12-31 | 2022-04-15 | 广州赛隆增材制造有限责任公司 | Suspension power supply |
-
2017
- 2017-03-17 CN CN201720267036.5U patent/CN207249521U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112527040A (en) * | 2020-11-25 | 2021-03-19 | 合肥同智机电控制技术有限公司 | Linear voltage stabilizing circuit |
| CN114362528A (en) * | 2021-12-31 | 2022-04-15 | 广州赛隆增材制造有限责任公司 | Suspension power supply |
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