CN204290280U - A kind of direct current machine current foldback circuit - Google Patents
A kind of direct current machine current foldback circuit Download PDFInfo
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- CN204290280U CN204290280U CN201420860942.2U CN201420860942U CN204290280U CN 204290280 U CN204290280 U CN 204290280U CN 201420860942 U CN201420860942 U CN 201420860942U CN 204290280 U CN204290280 U CN 204290280U
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- direct current
- triode
- delay
- operational amplifier
- relay
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Abstract
The utility model discloses a kind of direct current machine current foldback circuit, delay circuit comprises delay adjustment potentiometer R5 and the rear ground connection of delay capacitor C4, R5 and C4 series connection, and the connected node of R5 and C4 is electrically connected with the positive pole of operational amplifier; Current limliting regulating circuit comprises coarse adjustment potentiometer R1, trimmer potentiometer R2, connects divider resistance R3, R3 through divider resistance R6 ground connection, be connected through wire with operational amplifier negative electricity after divider resistance R3 and divider resistance R6, R1 and R2 parallel connection.Protection output circuit comprises relay and triode Q1, and the solenoid of relay is connected between the collector electrode of power vd D and triode Q1, and the base stage of triode Q1 is electrically connected with the output of operational amplifier, grounded emitter; The normally closed switch of relay is connected with motor feed circuit.The utility model has higher control precision and reliability, can available protecting direct current machine.
Description
Technical field
The utility model relates to a kind of direct current machine current foldback circuit, belongs to electroporation field.
Background technology
During direct current machine work, DC motor speed, moment of torsion are different, direct current machine operating current, overload current change thereupon, and in driving control system for electric machine, often use different types of direct current machine, the overload current of motor is not identical yet, and this makes adjustment to different motors with regard to needing driving control system., mainly there is following technical problem in existing direct current machine current foldback circuit: the function ratio of adjustment is poor in real time, and control precision is not high; Electric motor starting moment, operating current is higher than NOL normal overload electric current, and existing current foldback circuit, using instant starting currents as overload Limited Current, easily damages motor.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, provides a kind of direct current machine current foldback circuit, solves the technical problem that DC protection circuit control precision is not high, reliability is not high.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of direct current machine current foldback circuit, comprise input circuit, delay circuit, current limliting regulating circuit, operational amplifier and protection output circuit: described input circuit is made up of sampling resistor R4, one end of sampling resistor R4 connects the current input terminal of direct current machine, other end ground connection; Described delay circuit comprises delay adjustment potentiometer R5 and delay capacitor C4, ground connection after delay adjustment potentiometer R5 connects with delay capacitor C4, and the connected node of delay adjustment potentiometer R5 and delay capacitor C4 is electrically connected with the positive pole of operational amplifier by wire; Described current limliting regulating circuit comprises coarse adjustment potentiometer R1, trimmer potentiometer R2, divider resistance R3 and divider resistance R6, coarse adjustment potentiometer R1 is connected power vd D with one end after trimmer potentiometer R2 parallel connection, other end series connection divider resistance R3, divider resistance R3 through divider resistance R6 ground connection, through the negative pole of wire concatenation operation amplifier; Described protection output circuit comprises relay and for driving the triode Q1 of relay, the solenoid of relay is connected between the collector electrode of power vd D and triode Q1, and the base stage of triode Q1 is electrically connected with the output of operational amplifier, grounded emitter; The normally closed switch of described relay is connected with motor feed circuit; When overcurrent appears in direct current machine, the base current of triode Q1 increases, and collector electrode and the emitter current of triode Q1 also increase, and the solenoid of relay obtains electric, and the normally closed switch of relay disconnects, and cuts off direct current machine power supply circuits.
Also protective resistance R7 is in series with between the base stage of described operational amplifier and triode Q1.
As preferred version of the present utility model, the Standard resistance range of described coarse adjustment potentiometer R1 is the Standard resistance range of 0 ~ 10 k Ω, trimmer potentiometer R2 is 0 ~ 100k Ω.
As preferred version of the present utility model, the Standard resistance range of described delay adjustment potentiometer R5 is the capacitance of 0 ~ 100 k Ω, delay capacitor C4 is 1 μ F.
As preferred version of the present utility model, described operational amplifier selects model to be the two-way operational amplifier of LM358A.
As preferred version of the present utility model, described triode Q1 selects 9013 triodes.
Compared with prior art, the beneficial effect that the utility model reaches is: in delay circuit, R5, C4 form integrating circuit, filtering is carried out to the voltage that motor input current produces on R4, regulate R5 size, realize the adjustment to the testing lag time of electric motor starting electric current, avoid an instant starting currents as overload Limited Current, available protecting direct current machine; In current limliting regulating circuit, R1, R2 adopt varying number level potentiometer in parallel, and realize the coarse adjustment to Limited Current and fine setting, the convenience both ensured, improves control precision again; R3 is serially connected in regulating circuit simultaneously, as bleeder circuit, ensures the reliability that potentiometer regulates; Protective circuit drives relay by triode Q1, can be directly used in disconnection direct current machine and power, when there is overcurrent, in time, reliably can cut off direct current machine power supply.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection range of the present utility model with this.
As shown in Figure 1, be schematic block circuit diagram of the present utility model, comprise input circuit, delay circuit, current limliting regulating circuit, operational amplifier and protection output circuit, the concrete annexation of each several part and circuit composition are as shown in Figure 2.
Input circuit is made up of sampling resistor R4, and one end of sampling resistor R4 connects the current input terminal of direct current machine, other end ground connection.
Delay circuit comprises delay adjustment potentiometer R5 and delay capacitor C4, and ground connection after delay adjustment potentiometer R5 connects with delay capacitor C4, the connected node of delay adjustment potentiometer R5 and delay capacitor C4 is electrically connected with the positive pole of operational amplifier by wire.In delay circuit, R5, C4 form integrating circuit; filtering is carried out to the voltage that motor input current produces on R4, regulates R5 size, the adjustment of the testing lag time to electric motor starting electric current can be realized; avoid an instant starting currents as overload Limited Current, available protecting direct current machine.Preferably, the Standard resistance range of delay adjustment potentiometer R5 is the capacitance of 0 ~ 100 k Ω, delay capacitor C4 is 1 μ F.
Current limliting regulating circuit comprises coarse adjustment potentiometer R1, trimmer potentiometer R2, divider resistance R3 and divider resistance R6.Coarse adjustment potentiometer R1 and trimmer potentiometer R2 are in parallel, and preferably, the Standard resistance range of coarse adjustment potentiometer R1 is the Standard resistance range of 0 ~ 10 k Ω, trimmer potentiometer R2 is 0 ~ 100k Ω.R1, R2 adopt varying number level potentiometer can realize coarse adjustment to Limited Current and fine setting, and the convenience both ensured, improves control precision again.Coarse adjustment potentiometer R1 after parallel connection and trimmer potentiometer R2: one end is connected power vd D, other end series connection divider resistance R3, divider resistance R3, through divider resistance R6 ground connection, is connected with the negative electricity of operational amplifier through wire.Divider resistance R3 selects 1k Ω, and R6 selects 100k Ω.
Protection output circuit comprises relay and for driving the triode Q1 of relay, the solenoid of relay is connected between the collector electrode of power vd D and triode Q1, and the base stage of triode Q1 is electrically connected with the output of operational amplifier, grounded emitter.The normally closed switch of relay is connected with motor feed circuit.When overcurrent appears in direct current machine, the base current of triode Q1 increases, and transistor collector and emitter current also increase, and the solenoid of relay obtains, and the normally closed switch of relay disconnects, and cuts off direct current machine power supply circuits.Also be in series with protective resistance R7 between the base stage of operational amplifier and triode Q1, the value of protective resistance R7 is 5.1k Ω, for current limliting.
Preferably, operational amplifier selects model to be the two-way operational amplifier of LM358A, and triode Q1 selects 9013 triodes.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection range of the present utility model.
Claims (6)
1. a direct current machine current foldback circuit, is characterized in that, comprises input circuit, delay circuit, current limliting regulating circuit, operational amplifier and protection output circuit:
Described input circuit is made up of sampling resistor R4, and one end of sampling resistor R4 connects the current input terminal of direct current machine, other end ground connection;
Described delay circuit comprises delay adjustment potentiometer R5 and delay capacitor C4, ground connection after delay adjustment potentiometer R5 connects with delay capacitor C4, and the connected node of delay adjustment potentiometer R5 and delay capacitor C4 is electrically connected with the positive pole of operational amplifier by wire;
Described current limliting regulating circuit comprises coarse adjustment potentiometer R1, trimmer potentiometer R2, divider resistance R3 and divider resistance R6, coarse adjustment potentiometer R1 is connected power vd D with one end after trimmer potentiometer R2 parallel connection, other end series connection divider resistance R3, divider resistance R3 through divider resistance R6 ground connection, through the negative pole of wire concatenation operation amplifier;
Described protection output circuit comprises relay and for driving the triode Q1 of relay, the solenoid of relay is connected between the collector electrode of power vd D and triode Q1, and the base stage of triode Q1 is electrically connected with the output of operational amplifier, grounded emitter; The normally closed switch of described relay is connected with motor feed circuit;
When overcurrent appears in direct current machine, the base current of triode Q1 increases, and collector electrode and the emitter current of triode Q1 also increase, and the solenoid of relay obtains electric, and the normally closed switch of relay disconnects, and cuts off direct current machine power supply circuits.
2. direct current machine current foldback circuit according to claim 1, is characterized in that, is also in series with protective resistance R7 between the base stage of described operational amplifier and triode Q1.
3. direct current machine current foldback circuit according to claim 2, is characterized in that, the Standard resistance range of described coarse adjustment potentiometer R1 is the Standard resistance range of 0 ~ 10 k Ω, trimmer potentiometer R2 is 0 ~ 100k Ω.
4. direct current machine current foldback circuit according to claim 3, is characterized in that, the Standard resistance range of described delay adjustment potentiometer R5 is the capacitance of 0 ~ 100 k Ω, delay capacitor C4 is 1 μ F.
5. direct current machine current foldback circuit according to claim 4, is characterized in that, described operational amplifier selects model to be the two-way operational amplifier of LM358A.
6. direct current machine current foldback circuit according to claim 5, is characterized in that, described triode Q1 selects 9013 triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420860942.2U CN204290280U (en) | 2014-12-31 | 2014-12-31 | A kind of direct current machine current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420860942.2U CN204290280U (en) | 2014-12-31 | 2014-12-31 | A kind of direct current machine current foldback circuit |
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| Publication Number | Publication Date |
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| CN204290280U true CN204290280U (en) | 2015-04-22 |
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| CN201420860942.2U Active CN204290280U (en) | 2014-12-31 | 2014-12-31 | A kind of direct current machine current foldback circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532649A (en) * | 2015-09-14 | 2017-03-22 | 李文钦 | Driving protection method of DC motor |
| CN113517678A (en) * | 2021-04-23 | 2021-10-19 | 中山亿联智能科技有限公司 | Motor driving device and motor protection circuit |
-
2014
- 2014-12-31 CN CN201420860942.2U patent/CN204290280U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532649A (en) * | 2015-09-14 | 2017-03-22 | 李文钦 | Driving protection method of DC motor |
| CN113517678A (en) * | 2021-04-23 | 2021-10-19 | 中山亿联智能科技有限公司 | Motor driving device and motor protection circuit |
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| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: DC motor overcurrent protection circuit Effective date of registration: 20180712 Granted publication date: 20150422 Pledgee: Bank of Nanjing, Limited by Share Ltd, Nanjing branch Pledgor: Nanjing Shize Technology Co., Ltd. Registration number: 2018320000104 |