CN218825334U - Adjustable constant current circuit based on three-terminal regulator - Google Patents
Adjustable constant current circuit based on three-terminal regulator Download PDFInfo
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- CN218825334U CN218825334U CN202222917435.5U CN202222917435U CN218825334U CN 218825334 U CN218825334 U CN 218825334U CN 202222917435 U CN202222917435 U CN 202222917435U CN 218825334 U CN218825334 U CN 218825334U
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- voltage stabilizer
- constant current
- terminal regulator
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Abstract
The utility model provides an adjustable constant current circuit based on three-terminal regulator, including three-terminal regulator, potentiometre, electric capacity C1 and electric capacity C2; the input end of the three-terminal voltage stabilizer is connected with external input voltage, the output end of the three-terminal voltage stabilizer is connected with the potentiometer R P First end connected, regulated end connected potentiometer R P The input end of the three-terminal voltage stabilizer is connected with the ground through a capacitor C1, and the output end of the three-terminal voltage stabilizer is connected with the ground through a capacitor C2. The utility model discloses an adjustable constant current circuit based on three terminal regulator can export a stable electric current, can adjust output current value simultaneously, simple structure, and the implementation of being convenient for can the wide application in electronic circuit.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to adjustable constant current circuit based on three terminal regulator.
Background
With the development of electronic science and technology, the requirements of some devices on the function, stability and reliability of circuits are gradually increased, and the requirements on stable current are increasingly urgent. The constant current circuit can output stable current, the current is less influenced by external environment and power supply voltage, stable operation of other circuits can be ensured, and the constant current circuit becomes an indispensable part in electronic circuit design such as a storage battery charging circuit, an LED driving circuit, a control circuit and the like.
Disclosure of Invention
The utility model aims at overcoming the not enough of prior art, providing an adjustable constant current circuit based on three terminal regulator, can export stable direct current, can adjust constant current value size simultaneously.
The utility model adopts the technical proposal that:
an adjustable constant current circuit based on a three-terminal regulator comprises the three-terminal regulator, a potentiometer, a capacitor C1 and a capacitor C2;
the input end of the three-terminal voltage stabilizer is connected with external input voltage, and the output end of the three-terminal voltage stabilizer is connected with the potentiometer R P First end connected, regulated end connected potentiometer R P The input end of the three-terminal voltage stabilizer is connected with the ground through a capacitor C1, and the output end of the three-terminal voltage stabilizer is connected with the ground through a capacitor C2.
Specifically, the model of the three-terminal regulator is CW338.
In particular, the potentiometer R P The adjustable voltage range of (1.25V-32V).
Due to the adoption of the technical scheme, the utility model discloses have following superiority:
the utility model discloses an adjustable constant current circuit based on three terminal regulator can export a stable electric current, can adjust output current value simultaneously, and simple structure is convenient for implement, can the wide application in electronic circuit.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples, which are not intended to limit the scope of the invention, and the purpose of the present invention is to protect all technical improvements within the scope of the invention.
The adjustable constant current circuit based on the three-terminal regulator shown in the attached figure 1 comprises a three-terminal regulator, a potentiometer, a capacitor C1 and a capacitor C2;
the three-terminal regulator has model number CW338 and reference voltage V ref 1.25V, voltage is input from the input end of the three-terminal regulator, the output end of the three-terminal regulator and the potentiometer R P First end connected, regulated end connected potentiometer R P The capacitor C1 is connected between the input end of the three-terminal voltage stabilizer and the ground, and the capacitor C2 is connected between the output end of the three-terminal voltage stabilizer and the ground; potentiometer R between output end and adjusting end of three-terminal voltage stabilizer P Resistance value R, potentiometer R P The adjustable voltage range of the resistance value is 1.25V-32V; constant output current slave potentiometer R P The second end of (a); the voltage between the output end and the regulating end of the three-terminal voltage stabilizer is constant and flows through a potentiometer R P Has an output current of constant I 0 =V ref R, when different constant output currents I are required 0 While the potentiometer R is adjusted P Is adjusted to be R = Vref/I 0 。
The detailed part of the utility model is the prior art.
The embodiments selected for the purpose of disclosing the invention of the present invention are presently considered to be suitable, however, it is to be understood that the invention is intended to cover all variations and modifications of the embodiments falling within the scope of the inventive concept and the utility model.
Claims (3)
1. An adjustable constant current circuit based on a three-terminal regulator; the method is characterized in that: the three-terminal voltage stabilizer comprises a three-terminal voltage stabilizer, a potentiometer, a capacitor C1 and a capacitor C2;
the input end of the three-terminal voltage stabilizer is connected with external input voltage, and the output end of the three-terminal voltage stabilizer is connected with the potentiometer R P First end connected, regulated end connected potentiometer R P The input end of the three-terminal voltage stabilizer is connected with the ground through a capacitor C1, and the output end of the three-terminal voltage stabilizer is connected with the ground through a capacitor C2.
2. The adjustable constant current circuit based on the three-terminal regulator according to claim 1, characterized in that: the model of the three-terminal regulator is CW338.
3. The adjustable constant current circuit based on the three-terminal regulator as claimed in claim 1, wherein: the potentiometer R P The adjustable voltage range of (2) is 1.25V-32V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222917435.5U CN218825334U (en) | 2022-11-03 | 2022-11-03 | Adjustable constant current circuit based on three-terminal regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222917435.5U CN218825334U (en) | 2022-11-03 | 2022-11-03 | Adjustable constant current circuit based on three-terminal regulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218825334U true CN218825334U (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222917435.5U Active CN218825334U (en) | 2022-11-03 | 2022-11-03 | Adjustable constant current circuit based on three-terminal regulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218825334U (en) |
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2022
- 2022-11-03 CN CN202222917435.5U patent/CN218825334U/en active Active
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