CN206524614U - A kind of current-limiting protection controls circuit - Google Patents

A kind of current-limiting protection controls circuit Download PDF

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Publication number
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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China
Prior art keywords
connection
resistance
current
circuit
limiting protection
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Active
Application number
CN201720255171.8U
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Chinese (zh)
Inventor
曾亮
肖朝鹏
何�雄
袁锐
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Sichuan Jiuyuan Intelligent Fire Equipment Co., Ltd
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SICHUAN FOREVER INTELLIGENT CONTROL Co Ltd
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Priority to CN201720255171.8U priority Critical patent/CN206524614U/en
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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

A kind of current-limiting protection controls circuit
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.
CN201720255171.8U 2017-03-16 2017-03-16 A kind of current-limiting protection controls circuit Active CN206524614U (en)

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

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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

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Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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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