CN203761020U - Overcurrent protection circuit - Google Patents
Overcurrent protection circuit Download PDFInfo
- Publication number
- CN203761020U CN203761020U CN201420149714.4U CN201420149714U CN203761020U CN 203761020 U CN203761020 U CN 203761020U CN 201420149714 U CN201420149714 U CN 201420149714U CN 203761020 U CN203761020 U CN 203761020U
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- resistance
- triode
- utmost point
- capacitor
- diode
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Abstract
The utility model discloses an overcurrent protection circuit comprising resistors R1, R2, R3, R4, R5 and R6, an electrolytic capacitor CE1, a capacitor C1, an inductor L1, a diode VD1, and transistors Q1 and Q2, which are connected. By the aid of the overcurrent protection circuit, elements can be protected from being damaged when the current is excessively large due to short circuit.
Description
Technical field
The utility model relates to a kind of current foldback circuit.
Background technology
At present electronic installation is on the market when operation, there will be short circuit and the larger situation of electric current that causes, thereby some components and parts on electronic installation held can't stand excessive electric current and burn out, and then causes electronic installation cisco unity malfunction.Therefore, for these reasons, urgently need a kind of current foldback circuit, during the larger situation of electric current that this circuit can cause there is short circuit, can protect components and parts not to be damaged.
Utility model content
The technical problems to be solved in the utility model is, a kind of current foldback circuit is provided, and during the larger situation of electric current that this circuit can cause there is short circuit, can protect components and parts not to be damaged.
The technical solution of the utility model is, a kind of current foldback circuit is provided, and comprises resistance R 1, R2, R3, R4, R5, R6, electrochemical capacitor CE1, capacitor C 1, inductance L 1, diode VD1, triode Q1, Q2; One end of described inductance L 1 is power input; The other end of described inductance L 1 is connected with one end of resistance R 1, the e utmost point of one end of resistance R 2, triode Q2; The other end of described resistance R 1 is connected with the other end of resistance R 2, one end of the e utmost point of triode Q1, resistance R 3; The other end of described resistance R 3 is connected with the b utmost point of triode Q2, one end of resistance R 4; The b utmost point of described triode Q1 is connected with one end of the c utmost point of triode Q2, resistance R 6; The other end of described resistance R 6 is connected with common ground end; The c utmost point of described triode Q1 is connected with one end of the other end of resistance R 4, resistance R 5; The other end of described resistance R 5 is connected with the anode of diode VD1, one end of the positive pole of electrochemical capacitor CE1, capacitor C 1; The other end of the negative pole of described electrochemical capacitor CE1, capacitor C 1 is all connected with common ground end; The negative electrode of described diode VD1 is short circuit current input.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
The utility model current foldback circuit is mainly by the conducting of two triodes, power supply or the power-off that saturated, cut-off realizes power supply; thereby the situation that the electric current causing there is short circuit is larger; can realize power-off by the reciprocation of two triodes; and then avoid some components and parts on electronic installation to pass through excessive electric current, guaranteed the normal work of electronic installation.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model current foldback circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of current foldback circuit of the utility model, comprises resistance R 1, R2, R3, R4, R5, R6, electrochemical capacitor CE1, capacitor C 1, inductance L 1, diode VD1, triode Q1, Q2; One end of described inductance L 1 is power input; The other end of described inductance L 1 is connected with one end of resistance R 1, the e utmost point of one end of resistance R 2, triode Q2; The other end of described resistance R 1 is connected with the other end of resistance R 2, one end of the e utmost point of triode Q1, resistance R 3; The other end of described resistance R 3 is connected with the b utmost point of triode Q2, one end of resistance R 4; The b utmost point of described triode Q1 is connected with one end of the c utmost point of triode Q2, resistance R 6; The other end of described resistance R 6 is connected with common ground end; The c utmost point of described triode Q1 is connected with one end of the other end of resistance R 4, resistance R 5; The other end of described resistance R 5 is connected with the anode of diode VD1, one end of the positive pole of electrochemical capacitor CE1, capacitor C 1; The other end of the negative pole of described electrochemical capacitor CE1, capacitor C 1 is all connected with common ground end; The negative electrode of described diode VD1 is short circuit current input.
The operation principle of the utility model current foldback circuit is: under POWER_IN electrifying condition, and the direct conducting of this triode of Q2.Under circuit normal operation, the BE pole tension of this triode of Q1 is greater than 0.7V, so this triode is also conducting.In the time of this terminal shortcircuit of ANT+; and after the voltage of this electrochemical capacitor of CE1 is discharged; triode Q1 cut-off; because the electric current flowing through on R1 and R2 resistance becomes large, cause the voltage on R1 and R12 to become large, make the lower voltage of this point of VD1; make Q1 cut-off; thereby this triode of protection Q1 is not damaged, however the lower voltage of this point of VD1, and ANT+ can not normal power supply.When ANT+ recovers open circuit, ANT+ also can recover normal power supply.
Below only with regard to most preferred embodiment of the present utility model, be described, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various variations of doing in the protection range of the utility model independent claims are all in protection range of the present utility model.
Claims (1)
1. a current foldback circuit, is characterized in that: comprise resistance R 1, R2, R3, R4, R5, R6, electrochemical capacitor CE1, capacitor C 1, inductance L 1, diode VD1, triode Q1, Q2; One end of described inductance L 1 is power input; The other end of described inductance L 1 is connected with one end of resistance R 1, the e utmost point of one end of resistance R 2, triode Q2; The other end of described resistance R 1 is connected with the other end of resistance R 2, one end of the e utmost point of triode Q1, resistance R 3; The other end of described resistance R 3 is connected with the b utmost point of triode Q2, one end of resistance R 4; The b utmost point of described triode Q1 is connected with one end of the c utmost point of triode Q2, resistance R 6; The other end of described resistance R 6 is connected with common ground end; The c utmost point of described triode Q1 is connected with one end of the other end of resistance R 4, resistance R 5; The other end of described resistance R 5 is connected with the anode of diode VD1, one end of the positive pole of electrochemical capacitor CE1, capacitor C 1; The other end of the negative pole of described electrochemical capacitor CE1, capacitor C 1 is all connected with common ground end; The negative electrode of described diode VD1 is short circuit current input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149714.4U CN203761020U (en) | 2014-03-28 | 2014-03-28 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149714.4U CN203761020U (en) | 2014-03-28 | 2014-03-28 | Overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203761020U true CN203761020U (en) | 2014-08-06 |
Family
ID=51256257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420149714.4U Expired - Fee Related CN203761020U (en) | 2014-03-28 | 2014-03-28 | Overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203761020U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508530A (en) * | 2017-08-01 | 2017-12-22 | 合肥初慕科技有限公司 | AC inverter driving system circuit with current protection |
-
2014
- 2014-03-28 CN CN201420149714.4U patent/CN203761020U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508530A (en) * | 2017-08-01 | 2017-12-22 | 合肥初慕科技有限公司 | AC inverter driving system circuit with current protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20180328 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |