CN206524614U - A kind of current-limiting protection controls circuit - Google Patents
A kind of current-limiting protection controls circuit Download PDFInfo
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- CN206524614U CN206524614U CN201720255171.8U CN201720255171U CN206524614U CN 206524614 U CN206524614 U CN 206524614U CN 201720255171 U CN201720255171 U CN 201720255171U CN 206524614 U CN206524614 U CN 206524614U
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- 239000003381 stabilizer Substances 0.000 claims description 22
- 230000003111 delayed Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
Circuit, including current-limiting protection circuit, control relay circuit are controlled the utility model discloses a kind of current-limiting protection；The current-limiting protection circuit is connected with external input power；Described control relay circuit one end connects current-limiting protection circuit, and other end connection lead-out terminal is controlled to close or disconnected by single-chip microcomputer.Single-chip microcomputer current-limiting protection of the present utility model controls circuit, on state characteristic and closure, the disconnection of single-chip microcomputer control relay by PMOS, realizes completely isolated between power supply and load.Relay powering load again is again turned on meanwhile, it is capable to be delayed, effectively ensures the normal work of other loads.
Description
Technical field
The utility model is related to current-limiting protection control circuit, and in particular to a kind of current-limiting protection for single-chip microcomputer controls electricity
Road.
Background technology
At present, when power supply is powered to multiple equipment, each equipment is required for normally running under specified power.If
The short circuit of the equipment of some in running or power consumption increase suddenly, power supply will be caused to export increase to it, so as to influence miscellaneous equipment
Operation.In order to avoid it is above-mentioned the occurrence of, current-limiting protection device should be increased between power supply and equipment.
A kind of current-limiting protection circuit at present is obtained shown in accompanying drawing 1, its operation principle is, when electric current is less than setting value, by
R11 provides Q11 bias current, and Q11 saturation conductions do not play control action to electric current；When electric current is more than or equal to setting value,
The pressure drop and triode knot pressure and pressure drop close to R21 on pressure drop increase on R31, R31, then starts limitation Q11 and passes through
Electric current, thus current limit in certain level.The problem of this circuit is present is the electric current very little passed through, is used
Resistance R21 current limlitings are inaccurate, and when electric current continues excessive, triode has the risk burnt out, it is impossible to thorough deenergization and load
Connection, when that can not be delayed after current-limiting protection, a period of time restarts power supply.
The content of the invention
The utility model controls circuit, including current-limiting protection circuit, relay in view of the above-mentioned problems, providing a kind of current-limiting protection
Device controls circuit；The current-limiting protection circuit is connected with external input power；Described control relay circuit one end connects current limliting
Protection circuit, other end connection lead-out terminal, is controlled to close or is disconnected by single-chip microcomputer；
The current-limiting protection circuit includes resistance R1, R2, R3, triode Q1, voltage-stabiliser tube Z1, PMOS T1；Described three
Pole pipe Q1 emitter stage connection resistance R1 one end, base stage connection resistance R2 one end, colelctor electrode connection voltage-stabiliser tube Z1 anode；
One end connection voltage-stabiliser tube Z1 of resistance R1 negative electrode；One end connection voltage-stabiliser tube Z1 of resistance R2 negative electrode；The electricity
R3 one end connection voltage-stabiliser tube Z1 anode is hindered, the other end is with connecting power supply；The grid connection voltage-stabiliser tube Z1's of the PMOS
Anode, source electrode connects the negative electrode of voltage-stabiliser tube, drain electrode connection control relay circuit input；
The control relay circuit includes relay K1, triode Q2, resistance R4, diode D1；The relay K1
Coil one end connection 24V power supplys just, other end connecting triode Q2 colelctor electrode；The negative pole connection relay of the diode D1
The anode of device coil, positive pole connects the negative terminal of relay coil；The collector connection relay K1 coils of the triode Q2
Negative terminal, base stage connection resistance R4 one end, emitter stage connection power supply；One end connecting triode Q2 of resistance R4 base
Pole, the other end connects the I/O port of single-chip microcomputer.
Further, the resistance R1 resistances are 0.1 ohm.
Further, the resistance R2 resistances are 1 kilohm.
Further, the resistance R3 resistances are 100 kilohms.
Further, the resistance R4 resistances are 10 kilohms.
Advantage of the present utility model：
Single-chip microcomputer current-limiting protection of the present utility model controls circuit, by state characteristic and the single-chip microcomputer control of PMOS after
The closure of electrical equipment, disconnection, are realized completely isolated between power supply and load.Relay is again turned on meanwhile, it is capable to be delayed again
Powering load, effectively ensures the normal work of other loads.
In addition to objects, features and advantages described above, the utility model also has other purposes, feature and excellent
Point.Below with reference to figure, the utility model is described in further detail.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing further understanding to of the present utility model, of the present utility model
Schematic description and description is used to explain the utility model, does not constitute to improper restriction of the present utility model.
Fig. 1 is the schematic diagram of current current-limiting protection circuit；
Fig. 2 is the current-limiting protection control circuit theory diagrams of the utility model embodiment.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain this
Utility model, is not used to limit the utility model.
With reference to Fig. 2, a kind of current-limiting protection control circuit as shown in Figure 2, including current-limiting protection circuit, Control electricity
Road；The current-limiting protection circuit is connected with external input power；Realize overcurrent protection function；Described control relay circuit one end
Current-limiting protection circuit is connected, other end connection lead-out terminal is controlled to close or disconnected by single-chip microcomputer；
The current-limiting protection circuit includes resistance R1, R2, R3, triode Q1, voltage-stabiliser tube Z1, PMOS T1；Described three
Pole pipe Q1 emitter stage connection resistance R1 one end, base stage connection resistance R2 one end, colelctor electrode connection voltage-stabiliser tube Z1 anode；
One end connection voltage-stabiliser tube Z1 of resistance R1 negative electrode；One end connection voltage-stabiliser tube Z1 of resistance R2 negative electrode；The electricity
R3 one end connection voltage-stabiliser tube Z1 anode is hindered, the other end is with connecting power supply；The grid connection voltage-stabiliser tube Z1's of the PMOS
Anode, source electrode connects the negative electrode of voltage-stabiliser tube, drain electrode connection control relay circuit input；
The control relay circuit includes relay K1, triode Q2, resistance R4, diode D1；The relay K1
Coil one end connection 24V power supplys just, other end connecting triode Q2 colelctor electrode；The negative pole connection relay of the diode D1
The anode of device coil, positive pole connects the negative terminal of relay coil；The collector connection relay K1 coils of the triode Q2
Negative terminal, base stage connection resistance R4 one end, emitter stage connection power supply；One end connecting triode Q2 of resistance R4 base
Pole, the other end connects the I/O port of single-chip microcomputer.
The resistance R1 resistances are 0.1 ohm.
The resistance R2 resistances are 1 kilohm.
The resistance R3 resistances are 100 kilohms.
The resistance R4 resistances are 10 kilohms.
It is preferred that, the model IRF5305 of the PMOS T1.
It is preferred that, the triode Q1 model CS9015, triode Q2 model CS9014, diode D1 models
LBAS16LT1, voltage-stabiliser tube Z1 models LBZX84C12V5.
The current-limiting protection of the present embodiment single-chip microcomputer controls the specific work process of circuit：When circuit output end Vout and GND is short
Lu Shi, is increased, R1 both end voltages value also accordingly increases by resistance R1 electric current.Triode Q1 emitter stage surpasses with base voltage
Cross its cut-in voltage and turn on.After triode ON, because PMOS grid voltage is no longer less than source electrode, PMOS is cut
Only.Single-chip microcomputer collection output voltage reduction, then control relay disconnection.
Single-chip microcomputer current-limiting protection of the present utility model controls circuit, by state characteristic and the single-chip microcomputer control of PMOS after
The closure of electrical equipment, disconnection, are realized completely isolated between power supply and load.Relay is again turned on meanwhile, it is capable to be delayed again
Powering load, effectively ensures the normal work of other loads.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (5)
1. a kind of current-limiting protection controls circuit, it is characterised in that including current-limiting protection circuit, relay
Control circuit；The current-limiting protection circuit is connected with external input power；Control relay circuit one end connection limit
Protection circuit is flowed, other end connection lead-out terminal is controlled to close or disconnected by single-chip microcomputer；
The current-limiting protection circuit includes resistance R1, R2, R3, triode Q1, voltage-stabiliser tube Z1, PMOS T1；The triode
Q1 emitter stage connection resistance R1 one end, base stage connection resistance R2 one end, colelctor electrode connection voltage-stabiliser tube Z1 anode；It is described
Resistance R1 one end connection voltage-stabiliser tube Z1 negative electrode；One end connection voltage-stabiliser tube Z1 of resistance R2 negative electrode；The resistance R3
One end connection voltage-stabiliser tube Z1 anode, other end connection power supply；The grid connection voltage-stabiliser tube Z1 of PMOS anode,
Source electrode connects the negative electrode of voltage-stabiliser tube, drain electrode connection control relay circuit input；
The control relay circuit includes relay K1, triode Q2, resistance R4, diode D1；The line of the relay K1
Enclose one end connection 24V power supplys just, other end connecting triode Q2 colelctor electrode；The negative pole connection relay line of the diode D1
The anode of circle, positive pole connects the negative terminal of relay coil；The negative terminal of the collector connection relay K1 coils of the triode Q2,
Base stage connection resistance R4 one end, emitter stage connection power supply；One end connecting triode Q2 of resistance R4 base stage, it is another
The I/O port of end connection single-chip microcomputer.
2. current-limiting protection according to claim 1 controls circuit, it is characterised in that the resistance R1 resistances are 0.1 ohm.
3. current-limiting protection according to claim 1 controls circuit, it is characterised in that the resistance R2 resistances are 1 kilohm.
4. current-limiting protection according to claim 1 controls circuit, it is characterised in that the resistance R3 resistances are 100 kilo-ohms
Nurse.
5. current-limiting protection according to claim 1 controls circuit, it is characterised in that the resistance R4 resistances are 10 kilo-ohms
Nurse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720255171.8U CN206524614U (en) | 2017-03-16 | 2017-03-16 | A kind of current-limiting protection controls circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720255171.8U CN206524614U (en) | 2017-03-16 | 2017-03-16 | A kind of current-limiting protection controls circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206524614U true CN206524614U (en) | 2017-09-26 |
Family
ID=59902969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720255171.8U Active CN206524614U (en) | 2017-03-16 | 2017-03-16 | A kind of current-limiting protection controls circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206524614U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923399A (en) * | 2018-07-02 | 2018-11-30 | 山东航天电子技术研究所 | A kind of recoverable constant current type surge restraint circuit |
-
2017
- 2017-03-16 CN CN201720255171.8U patent/CN206524614U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108923399A (en) * | 2018-07-02 | 2018-11-30 | 山东航天电子技术研究所 | A kind of recoverable constant current type surge restraint circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200507 Address after: Mianyang City, Sichuan Province, 621000 Industrial Park Patentee after: Sichuan Jiuyuan Intelligent Fire Equipment Co., Ltd Address before: 621000 Mianyang province Sichuan City Road No. 64 of No. 34 Mianshan Patentee before: SICHUAN FOREVER INTELLIGENT CONTROL Co.,Ltd. |
|
| TR01 | Transfer of patent right |