CN206790073U - A kind of cut-off type current foldback circuit - Google Patents
A kind of cut-off type current foldback circuit Download PDFInfo
- Publication number
- CN206790073U CN206790073U CN201720457242.2U CN201720457242U CN206790073U CN 206790073 U CN206790073 U CN 206790073U CN 201720457242 U CN201720457242 U CN 201720457242U CN 206790073 U CN206790073 U CN 206790073U
- Authority
- CN
- China
- Prior art keywords
- triode
- resistance
- cut
- resistor
- base stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of cut-off type current foldback circuit; including power input terminal and load output terminal; excessively stream cut-off protection circuit is provided between the power input terminal and load output terminal, the excessively stream cut-off protection circuit includes first resistor, 3rd resistor, the 4th resistance, the 6th resistance, the 7th resistance, the first triode, the second triode and the 3rd triode.Structure setting of the present utility model is reasonable, and it is provided with excessively stream cut-off protection circuit, and when load outputs have overcurrent, it realizes that current loop ends by triode, and so as to reach the function of overcurrent protection, stability in use is good and strong applicability, practicality are good.
Description
Technical field
The utility model belongs to current foldback circuit technical field, and in particular to a kind of cut-off type current foldback circuit.
Background technology
With the maturation of China's electronic device technology, various electronic equipments are quickly grown, during electronic equipment use
Occur that load current exceeds the situation of rated current unavoidably, do not have corresponding protection structure in the circuit of conventional art, from
And electronic equipment is easily damaged, so applicability and practicality are restricted.
The content of the invention
The purpose of this utility model is to provide the cut-off type overcurrent protection that a kind of structure setting is reasonable and stability in use is good
Circuit.
The technical scheme for realizing the utility model purpose is a kind of cut-off type current foldback circuit, including power input terminal
And load output terminal, excessively stream cut-off protection circuit is provided between the power input terminal and load output terminal, it is described
Excessively stream cut-off protection circuit include first resistor, 3rd resistor, the 4th resistance, the 6th resistance, the 7th resistance, the first triode,
Second triode and the 3rd triode, the colelctor electrode of the 3rd triode are connected on the positive pole of power input terminal, launched
Pole is connected on the positive pole of load output terminal by first resistor, the base stage of the 3rd triode and the collection of the first triode
Electrode is connected, and the 7th resistance is connected between colelctor electrode and the base stage of the 3rd triode, the hair of first triode
Emitter grounding, base stage are connected to the emitter stage of the 3rd triode by the 6th resistance eutral grounding, the emitter stage of second triode
Upper, colelctor electrode is connected to by 3rd resistor in the base stage of the first triode and the base stage of the second triode is connected by the 4th resistance
It is connected between first resistor and load output terminal.
First triode and the 3rd triode are NPN type triode and the second triode is PNP type triode.
The first resistor is adjustable valued resistor.
The utility model has positive effect：Structure setting of the present utility model is reasonable, and it is provided with excessively stream cut-off and protected
Protection circuit, when load outputs have overcurrent, it realizes that current loop ends by triode, so as to reach overcurrent protection
Function, stability in use is good and strong applicability, practicality are good.
Brief description of the drawings
In order that content of the present utility model is more likely to be clearly understood, below according to specific embodiment and combine attached
Figure, is described in further detail to the utility model, wherein：
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
(embodiment 1)
Fig. 1 shows a kind of embodiment of the present utility model, and wherein Fig. 1 is that circuit structure of the present utility model shows
It is intended to.
Fig. 1, a kind of cut-off type current foldback circuit, including power input terminal 1 and load output terminal 2 are seen, described
Excessively stream cut-off protection circuit 3 is provided between power input terminal 1 and load output terminal 2, the excessively stream cut-off protection circuit 3 is wrapped
Include first resistor R1,3rd resistor R3, the 4th resistance R4, the 6th resistance R6, the 7th resistance R7, the first triode Q1, the two or three
Pole pipe Q2 and the 3rd triode Q3, the colelctor electrode of the 3rd triode Q3 are connected on the positive pole of power input terminal 1, launched
Pole is connected to by first resistor R1 on the positive pole of load output terminal 2, base stage and the one or three pole of the 3rd triode Q3
Pipe Q1 colelctor electrode is connected, and the 7th resistance R7 is connected between the 3rd triode Q3 colelctor electrode and base stage, and described
One triode Q1 grounded emitter, base stage are grounded by the 6th resistance R6, and the emitter stage of the second triode Q2 is connected to
On 3rd triode Q3 emitter stage, colelctor electrode is connected in the first triode Q1 base stage and the two or three by 3rd resistor R3
Pole pipe Q2 base stage is connected between first resistor R1 and load output terminal 2 by the 4th resistance R4.
First triode and the 3rd triode are NPN type triode and the second triode is PNP type triode.
The first resistor is adjustable valued resistor.
Its operation principle is summarized as follows：
Power supply is powered by resistance R7 and the 3rd triode to load；When the electric current of work is less than setting value, electricity
Resistance R1 both end voltages are less than 0.6V, and triode Q2 cut-offs, now Q1 does not have bias voltage, so Q1 is also at cut-off state, electricity
Road normal work；When operating current is more than setting value, R1 both end voltages are more than 0.6V, and triode Q2 conductings, now Q1 has partially
Voltage and electric current are put, Q1 conductings, Q3 base stages lose bias voltage and electric current because of Q2 conducting, thus Q3 ends, current loop
It is truncated, so as to have the function that overcurrent protection.The electric current for adjusting the R1 adjustable overcurrent protection of resistance is few greatly.
Structure setting of the present utility model is reasonable, and it is provided with excessively stream cut-off protection circuit, when load outputs had electricity
During stream, it realizes that current loop ends by triode, and so as to reach the function of overcurrent protection, stability in use is good and applicable
Property is strong, and practicality is good.
Obviously, above-described embodiment of the present utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, in described above
On the basis of can also make other changes in different forms.There is no need and unable to give all embodiments
It is exhaustive.And these belong to the obvious changes or variations that connotation of the present utility model is extended out and still fall within this practicality
New protection domain.
Claims (3)
1. a kind of cut-off type current foldback circuit, including power input terminal and load output terminal, in the power input
Excessively stream cut-off protection circuit is provided between son and load output terminal, it is characterised in that：The excessively stream cut-off protection circuit includes
First resistor, 3rd resistor, the 4th resistance, the 6th resistance, the 7th resistance, the first triode, the second triode and the three or three pole
Pipe, the colelctor electrode of the 3rd triode is connected on the positive pole of power input terminal, emitter stage is connected to by first resistor
On the positive pole of load output terminal, the base stage of the 3rd triode is connected with the colelctor electrode of the first triode, and the described 7th
Resistance is connected between colelctor electrode and the base stage of the 3rd triode, and the grounded emitter of first triode, base stage pass through
Six resistance eutral groundings, the emitter stage of second triode is connected on the emitter stage of the 3rd triode, colelctor electrode passes through the 3rd electricity
Resistance is connected in the base stage of the first triode and the base stage of the second triode is connected to first resistor and load by the 4th resistance
Between lead-out terminal.
2. cut-off type current foldback circuit according to claim 1, it is characterised in that：First triode and the three or three
Pole pipe is NPN type triode and the second triode is PNP type triode.
3. cut-off type current foldback circuit according to claim 2, it is characterised in that：The first resistor is adjustable resistance
Resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720457242.2U CN206790073U (en) | 2017-04-27 | 2017-04-27 | A kind of cut-off type current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720457242.2U CN206790073U (en) | 2017-04-27 | 2017-04-27 | A kind of cut-off type current foldback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206790073U true CN206790073U (en) | 2017-12-22 |
Family
ID=60709159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720457242.2U Active CN206790073U (en) | 2017-04-27 | 2017-04-27 | A kind of cut-off type current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206790073U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879592A (en) * | 2018-07-27 | 2018-11-23 | Tcl通力电子（惠州）有限公司 | HDMI power overcurrent protection circuit and equipment |
-
2017
- 2017-04-27 CN CN201720457242.2U patent/CN206790073U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879592A (en) * | 2018-07-27 | 2018-11-23 | Tcl通力电子（惠州）有限公司 | HDMI power overcurrent protection circuit and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205901252U (en) | Novel current foldback circuit | |
| CN106972769A (en) | A kind of light current electrical load overvoltage crowbar | |
| CN108039695B (en) | Overvoltage crowbar | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN105470914A (en) | Undervoltage and overvoltage circuit for intelligent vehicle-mounted equipment | |
| CN207612045U (en) | A kind of protection chip | |
| CN101651332B (en) | Power protection circuit preventing controlled silicon effect | |
| CN206790073U (en) | A kind of cut-off type current foldback circuit | |
| CN205039517U (en) | Overvoltage protection circuit | |
| CN203352131U (en) | Port with over-current protection and surge prevention functions | |
| CN102025122A (en) | Protective circuit | |
| CN206673557U (en) | A kind of electric instrument intelligent protection circuit | |
| CN102025140B (en) | Polymeric positive temperature coefficient (PPTC) overcurrent protection module and electronic products | |
| CN206727724U (en) | Active and standby dc source with defencive function | |
| CN202421457U (en) | Motor over-current detection circuit | |
| CN205016987U (en) | BMS activates circuit | |
| CN209461383U (en) | Relay drive circuit, relay | |
| CN204118720U (en) | A kind of high-end output circuit with current-limiting protection | |
| CN107093886A (en) | It is a kind of to be embedded in solar powered network from the voltage security power supply circuit become in device | |
| CN202424107U (en) | Over-current protection circuit and player | |
| CN206498183U (en) | A kind of over-and under-voltage protection circuit | |
| CN206602353U (en) | A kind of circuit overcurrent protection | |
| CN206790074U (en) | A kind of inexpensive control machines protection circuit | |
| CN206788680U (en) | A kind of Novel constant-flow circuit | |
| CN206788239U (en) | A kind of overvoltage delay indicating circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230111 Address after: 529000 Room 203, Floor 2, Building 1, No. 21, Jintong Road, Tangxia Town, Pengjiang District, Jiangmen City, Guangdong Province Patentee after: Jiangmen Xiaosong Intelligent Technology Co.,Ltd. Address before: 529000 301, Floor 3, Building 2, No. 21, Jintong Road, Tangxia Town, Pengjiang District, Jiangmen City, Guangdong Province Patentee before: JIANGMEN PENGJIANG DISTRICT JINYING TECHNOLOGY Co.,Ltd. |