CN216434789U - Precise voltage stabilizing circuit formed by single operational amplifier and transistor - Google Patents
Precise voltage stabilizing circuit formed by single operational amplifier and transistor Download PDFInfo
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- CN216434789U CN216434789U CN202123372506.XU CN202123372506U CN216434789U CN 216434789 U CN216434789 U CN 216434789U CN 202123372506 U CN202123372506 U CN 202123372506U CN 216434789 U CN216434789 U CN 216434789U
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Abstract
The utility model provides a precision voltage stabilizing circuit that single fortune was put and is constituted with the transistor belongs to automatic technical field. The utility model discloses constitute by components such as operational amplifier A, output drive circuit T1, diode D, stabilivolt and resistance. Constitute input voltage to output voltage's accurate voltage conversion circuit through changing reference voltage, to the very little circuit of load current, the utility model discloses a circuit still can simplify to can finely tune output voltage through adjusting the variable resistance. The utility model discloses the circuit form is simple, and the precision is higher, has good social and economic benefits, possesses certain popularization and application and worth.
Description
Technical Field
The utility model belongs to the technical field of it is automatic, concretely relates to precision voltage stabilizing circuit who constitutes with the transistor is put to single fortune.
Background
High-quality equipment generally needs a voltage stabilizing circuit, and in some practical application circuits, an operational amplifier circuit is often used for voltage stabilization. Due to the practical requirement limitation of the circuit, the functions of the operational amplifier circuit are always remained, which causes the function waste of the operational amplifier circuit.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects existing in the prior art, the utility model provides a precise voltage stabilizing circuit consisting of a single operational amplifier and a transistor.
In order to achieve the above object, the present invention provides the following technical solutions:
a precision voltage stabilizing circuit composed of a single operational amplifier and a transistor comprises:
a resistor R1 having one end electrically connected to the input voltage VCC;
one end of the resistor R2 is grounded, and the other end of the resistor R1 is electrically connected with the other end of the resistor R2;
one end of the diode D is electrically connected with the other end of the resistor R2;
voltage stabilizing tube VZOne end of the diode D is electrically connected with the other end of the diode D, and the other end of the diode D is grounded;
an operational amplifier A, an input terminal and the voltage regulator tube VZOne end of the power supply is electrically connected, the other input end of the power supply is grounded, and the power supply interface is grounded and inputs voltage VCC;
a resistor R6, one end of which is connected with the voltage regulator tube VZIs electrically connected with one end of the first connecting rod;
a resistor Rf having one end electrically connected to the other input terminal of the operational amplifier a and the other end electrically connected to the other end of the resistor R6;
a resistor R4, one end of which is electrically connected with the output end of the operational amplifier A;
the emitter follower T1 has a base electrically connected to the other end of the resistor R4, an emitter electrically connected to the other end of the resistor Rf, and a collector connected to an input voltage VCC.
Preferably, the method further comprises the following steps:
one end of the resistor R5 is electrically connected with one end of one input end of the operational amplifier A, and the other end of the resistor R5 is connected with the voltage regulator tube VZIs electrically connected with one end of the first connecting rod;
a capacitor C1, one end of which is connected with the voltage regulator tube VZAnd the other end is electrically connected to one end of the resistor R5.
Preferably, the method further comprises the following steps:
one end of the variable resistor R3 is grounded, and the other end is electrically connected with the other input end of the operational amplifier A.
The utility model provides a precision voltage stabilizing circuit that single operational amplifier and transistor constitute, has following beneficial effect: the utility model discloses constitute by components such as operational amplifier A, output drive circuit T1, diode D, stabilivolt and resistance. Constitute input voltage to output voltage's accurate voltage conversion circuit through changing reference voltage, to the very little circuit of load current, the utility model discloses a circuit still can simplify to can finely tune output voltage through adjusting the variable resistance. The utility model discloses the circuit form is simple, and the precision is higher, has good social and economic benefits, possesses certain popularization and application and worth.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the invention and it will be clear to a person skilled in the art that other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a precise voltage stabilizing circuit formed by a single operational amplifier and a transistor according to embodiment 1 of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood and practical for those skilled in the art, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The utility model provides a precision voltage stabilizing circuit that single fortune was put and the transistor constitutes specifically as shown in figure 1, include: resistor R1, resistor R2, diode D and voltage regulator tube VZOperational amplifier A, resistor R6, resistor Rf, resistor R4, emitter follower T1, resistor R5, capacitor C1 and variable resistor R3.
Specifically, the connection relationship of the electrical components of the precise voltage stabilizing circuit formed by the single operational amplifier and the transistor is as follows: one end of the resistor R1 is electrically connected with the input voltage VCC; one end of the resistor R2 is grounded, and the other end of the resistor R1 is electrically connected with the other end of the resistor R2; one end of the diode D is electrically connected with the other end of the resistor R2; voltage stabilizing tube VZOne end of the diode D is electrically connected with the other end of the diode D, and the other end of the diode D is grounded; one input end of the operational amplifier A and the voltage-stabilizing tube VZOne end of the power supply is electrically connected, the other input end of the power supply is grounded, and the power supply interface is grounded and inputs voltage VCC; one end of the resistor R6 and the voltage regulator tube VZIs electrically connected with one end of the first connecting rod; one end of the resistor Rf is electrically connected with the other input end of the operational amplifier A, and the other end of the resistor Rf is electrically connected with the other end of the resistor R6; one end of the resistor R4 is electrically connected with the output end of the operational amplifier A; the base of the emitter follower T1 is electrically connected with the other end of the resistor R4, the emitter thereof is electrically connected with the other end of the resistor Rf, and the collector thereof is connected with the input voltage VCC; one end of the resistor R5 is electrically connected with one input end of the operational amplifier A, and the other end is connected with the voltage regulator tube VZIs electrically connected with one end of the first connecting rod; one end of the capacitor C1 and the voltage regulator tube VZThe other end of the resistor R5 is electrically connected to the other end of the resistor R5. One end of the variable resistor R3 is grounded, and the other end is electrically connected to the other input terminal of the operational amplifier a.
The utility model provides a pair of accurate voltage stabilizing circuit that constitutes with the transistor is put to single fortune's theory of operation as follows: resistor R6 and voltage regulator tube VZOutput reference voltage V forming a voltage regulator circuitRThe operational amplifier a constitutes an inverting negative feedback amplifying circuit. Because the voltage stabilizing circuit is a negative feedback circuitThe input of the operational amplifier has V+＝V-I.e. VF＝VRThe emitter follower T1 will maintain the output voltage at VRUpper, R in FIG. 1LFor the hypothetical load, when the hypothetical load R isLWhen the voltage becomes smaller, the output current of the emitter follower T1 increases, and the output voltage V is increased because the emitter follower T1 has certain internal impedanceoutSlightly decreased, negative feedback voltage VFAlso decreases due to VFRatio VRLow, causing the output of the operational amplifier a to increase, the output voltage of the emitter follower T1 also increases, thereby maintaining the output voltage VoutIs substantially unchanged.
In the present embodiment, the output voltage V is output at the instant of circuit-onoutThe non-inverting input end of the operational amplifier A can be locked in an uncertain state through resistors R1 and R2, a diode D and a voltage regulator tube VZForm the starting input voltage VRThe starting circuit composed of R1, R2 and diode D can make the voltage regulator tube V before the operational amplifier is conductedZWith fixed bias, when the active devices such as operational amplifier A are conducted, the diode D becomes reverse bias, and the voltage regulator tube VZAn output reference comparison V is formed by providing bias by a resistor R6R。VRIs connected to the non-inverting input terminal V of the operational amplifier A through a resistor R5+。
The feedback circuit resistor Rf is connected to the inverting input V of the operational amplifier A via the emitter of the emitter follower T1-And is grounded through a variable resistor R3, and the output voltage V is finely adjusted by adjusting the variable resistor R3out。
The resistor R4 is the output current limiting resistor of the operational amplifier A and is used for reducing the voltage regulator tube VZRipple and noise on, voltage regulator tube VZThe resistor R5 and the capacitor C1 are connected in series.
Example 2
In this embodiment, if the output of the operational amplifier A can meet the load current requirement, the emitter follower T1 and the resistor R4 can be eliminated from the voltage regulator circuit, and the output of the operational amplifier A is directly electrically connected with the load. The rest is the same as the content of embodiment 1, and the description is omitted.
The above embodiments are only preferred embodiments of the present invention, the scope of protection of the present invention is not limited thereto, and any person skilled in the art can obviously obtain simple changes or equivalent replacements of the technical solutions within the technical scope of the present invention.
Claims (3)
1. A precision voltage stabilizing circuit composed of a single operational amplifier and a transistor is characterized by comprising:
a resistor R1 having one end electrically connected to the input voltage VCC;
one end of the resistor R2 is grounded, and the other end of the resistor R1 is electrically connected with the other end of the resistor R2;
one end of the diode D is electrically connected with the other end of the resistor R2;
voltage stabilizing tube VZOne end of the diode D is electrically connected with the other end of the diode D, and the other end of the diode D is grounded;
an operational amplifier A, an input terminal and the voltage regulator tube VZOne end of the power supply is electrically connected, the other input end of the power supply is grounded, and the power supply interface is grounded and inputs voltage VCC;
a resistor R6, one end of which is connected with the voltage regulator tube VZIs electrically connected with one end of the first connecting rod;
a resistor Rf, one end of which is electrically connected to the other input end of the operational amplifier a, and the other end of which is electrically connected to the other end of the resistor R6;
a resistor R4, one end of which is electrically connected with the output end of the operational amplifier A;
the emitter follower T1 has a base electrically connected to the other end of the resistor R4, an emitter electrically connected to the other end of the resistor Rf, and a collector connected to an input voltage VCC.
2. The precision voltage regulator circuit of claim 1, further comprising:
one end of the resistor R5 is electrically connected with one end of one input end of the operational amplifier A, and the other end of the resistor R5 is connected with the voltage regulator tube VZIs electrically connected with one end of the first connecting rod;
capacitor C1, one terminal andthe voltage stabilizing tube VZAnd the other end is electrically connected to one end of the resistor R5.
3. The precision voltage regulator circuit of claim 1, further comprising:
one end of the variable resistor R3 is grounded, and the other end is electrically connected with the other input end of the operational amplifier A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123372506.XU CN216434789U (en) | 2021-12-29 | 2021-12-29 | Precise voltage stabilizing circuit formed by single operational amplifier and transistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123372506.XU CN216434789U (en) | 2021-12-29 | 2021-12-29 | Precise voltage stabilizing circuit formed by single operational amplifier and transistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216434789U true CN216434789U (en) | 2022-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123372506.XU Active CN216434789U (en) | 2021-12-29 | 2021-12-29 | Precise voltage stabilizing circuit formed by single operational amplifier and transistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216434789U (en) |
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2021
- 2021-12-29 CN CN202123372506.XU patent/CN216434789U/en active Active
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