CN202050227U - Multifunctional linear voltage regulator circuit - Google Patents
Multifunctional linear voltage regulator circuit Download PDFInfo
- Publication number
- CN202050227U CN202050227U CN2011201033235U CN201120103323U CN202050227U CN 202050227 U CN202050227 U CN 202050227U CN 2011201033235 U CN2011201033235 U CN 2011201033235U CN 201120103323 U CN201120103323 U CN 201120103323U CN 202050227 U CN202050227 U CN 202050227U
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- triode
- linear voltage
- diode
- circuit
- voltage regulator
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Abstract
The utility model discloses a multifunctional linear voltage regulator circuit. The multifunctional linear voltage regulator circuit comprises a linear voltage regulator circuit, an over-current protection circuit and a diode D1, wherein the linear voltage regulator circuit consists of resistors R1, R2 and R3, triodes Q1 and Q2 and a voltage regulator diode Z1; and the over-current protection circuit formed by resistors RS, R5, R6 and R7, a diode D2 and a triode Q3.. The resistors R5, R6 and R7 are connected in series. The resistor RS serves as a current-detecting resistor; and when the current flowing through the resistor RS reaches a preset value, the triode Q3 is powered on, so that the triodes Q2 and Q1 are cut off, which achieves the function of over-current protection. The diode D1 is connected to the linear voltage regulator circuit, the anode of the diode D1 is connected in series with the line between the resistors R1 and R2, and the cathode of the diode D1 is connected with the collector electrode of the triode Q1. After the diode D1 is applied, when the linear voltage regulator circuit is in a short-circuit state, the current flowing through the triode Q1 is very small, so that the triode Q1 is protected from burning, which achieves the function of short-circuit protection.
Description
Technical field
The utility model relates to a kind of linear voltage-stabilizing circuit, relates to a kind of multi-functional linear voltage stabilizing circuit with overcurrent protection and short-circuit protection function in particular.
Background technology
Traditional linear voltage-stabilizing circuit is by resistance R 1, R2, R3 and triode Q1, Q2 and voltage stabilizing didoe Z1 form, when linear voltage-stabilizing circuit is short-circuited or the electric current that passes through when excessive, be easy to cause three utmost point Q1 to burn after work a period of time, cause linear voltage-stabilizing circuit to work, thereby greatly reduce linear voltage-stabilizing circuit useful life.
The utility model content
The purpose of this utility model is to overcome above-mentioned defective in the prior art: a kind of have overcurrent protection and short-circuit protection function are provided, can effectively prolong the linear voltage-stabilizing circuit multi-functional linear voltage stabilizing circuit in useful life.
For achieving the above object; the technical scheme that the utility model provides is as follows: construct a kind of multi-functional linear voltage stabilizing circuit; comprise by resistance R 1; R2; the linear voltage-stabilizing circuit that R3 and triode Q1, Q2 and voltage stabilizing didoe Z1 form; also comprise by resistance R S, R5, R6, R7; diode D2; the current foldback circuit that triode Q3 forms; described resistance R 5, R6, R7 are connected in series, and resistance R S is as current sense resistor, when the electric current on it of flowing through reaches set point; triode Q3 conducting ends triode Q2 and triode Q1.
As further improvement of the utility model, also comprise the diode D1 that is connected on the linear voltage-stabilizing circuit, the positive pole of this diode D1 is connected with circuit between the resistance R 1 that is connected in series, the R2, and its negative pole is connected with the collector electrode of triode Q1.
The beneficial effect of multi-functional linear voltage stabilizing circuit described in the utility model is: by constructing by resistance R S; R5; R6; R7; diode D2; the current foldback circuit that triode Q3 forms; described resistance R 5; R6; R7 is connected in series; resistance R S is as current sense resistor; when the electric current on it of flowing through reaches set point; triode Q3 conducting; triode Q2 and triode Q1 are ended; reach the function of overcurrent protection; also comprise the diode D1 that is connected on the linear voltage-stabilizing circuit, the positive pole of this diode D1 and the resistance R 1 that is connected in series; circuit between the R2 connects, and its negative pole is connected with the collector electrode of triode Q1; add after the diode D1; can allow the linear voltage-stabilizing circuit electric current that triode Q1 is passed through when short circuit very little, avoid triode Q1 to burn, reach the function of short-circuit protection.
Below in conjunction with drawings and Examples multi-functional linear voltage stabilizing circuit described in the utility model is described further:
Description of drawings
Fig. 1 is the circuit theory diagrams of the multi-functional linear voltage stabilizing circuit of the utility model.
Embodiment
Below the most preferred embodiment of multi-functional linear voltage stabilizing circuit described in the utility model, therefore do not limit protection range of the present utility model.
With reference to Fig. 1; a kind of multi-functional linear voltage stabilizing circuit is provided; comprise by resistance R 1; R2; the linear voltage-stabilizing circuit 1 that R3 and triode Q1, Q2 and voltage stabilizing didoe Z1 form; also comprise by resistance R S, R5, R6, R7; diode D2; the current foldback circuit 2 that triode Q3 forms, described resistance R 5, R6, R7 are connected in series, and resistance R S is as current sense resistor; when the electric current on it of flowing through reaches set point; triode Q3 conducting ends triode Q2 and triode Q1, reaches the function of overcurrent protection.
As further improvement of the utility model; also comprise the diode D1 that is connected on the linear voltage-stabilizing circuit 1; the positive pole of this diode D1 is connected with circuit between the resistance R 1 that is connected in series, the R2; its negative pole is connected with the collector electrode of triode Q1; add after the diode D1; can allow linear voltage-stabilizing circuit 1 electric current that triode Q1 is passed through when short circuit very little, avoid triode Q1 to burn, reach the function of short-circuit protection.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (2)
1. a multi-functional linear voltage stabilizing circuit comprises by resistance R 1, R2; the linear voltage-stabilizing circuit (1) that R3 and triode Q1, Q2 and voltage stabilizing didoe Z1 form; it is characterized in that, also comprise by resistance R S, R5, R6, R7 diode D2; the current foldback circuit (2) that triode Q3 forms; described resistance R 5, R6, R7 are connected in series, and resistance R S is as current sense resistor, when the electric current on it of flowing through reaches set point; triode Q3 conducting ends triode Q2 and triode Q1.
2. multi-functional linear voltage stabilizing circuit according to claim 1, it is characterized in that, also comprise the diode D1 that is connected on the linear voltage-stabilizing circuit (1), the positive pole of this diode D1 is connected with circuit between the resistance R 1 that is connected in series, the R2, and its negative pole is connected with the collector electrode of triode Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201033235U CN202050227U (en) | 2011-04-11 | 2011-04-11 | Multifunctional linear voltage regulator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201033235U CN202050227U (en) | 2011-04-11 | 2011-04-11 | Multifunctional linear voltage regulator circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202050227U true CN202050227U (en) | 2011-11-23 |
Family
ID=44990520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201033235U Expired - Lifetime CN202050227U (en) | 2011-04-11 | 2011-04-11 | Multifunctional linear voltage regulator circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202050227U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904232A (en) * | 2012-11-14 | 2013-01-30 | 梅州市志浩电子科技有限公司 | Circuit compensating controller |
| CN103592991A (en) * | 2013-12-01 | 2014-02-19 | 西安电子科技大学 | Power limitation type protection circuit used for double-pole linear voltage regulator |
| CN104917363A (en) * | 2015-05-04 | 2015-09-16 | 惠州三华工业有限公司 | Double-output power supply voltage stabilization protection circuit |
-
2011
- 2011-04-11 CN CN2011201033235U patent/CN202050227U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904232A (en) * | 2012-11-14 | 2013-01-30 | 梅州市志浩电子科技有限公司 | Circuit compensating controller |
| CN102904232B (en) * | 2012-11-14 | 2015-11-18 | 梅州市志浩电子科技有限公司 | Circuit compensation controller |
| CN103592991A (en) * | 2013-12-01 | 2014-02-19 | 西安电子科技大学 | Power limitation type protection circuit used for double-pole linear voltage regulator |
| CN104917363A (en) * | 2015-05-04 | 2015-09-16 | 惠州三华工业有限公司 | Double-output power supply voltage stabilization protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111123 |
|
| CX01 | Expiry of patent term |