CN203734586U - Direct-current motor current-limiting protection circuit - Google Patents
Direct-current motor current-limiting protection circuit Download PDFInfo
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- CN203734586U CN203734586U CN201420082217.7U CN201420082217U CN203734586U CN 203734586 U CN203734586 U CN 203734586U CN 201420082217 U CN201420082217 U CN 201420082217U CN 203734586 U CN203734586 U CN 203734586U
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Abstract
The utility model relates to a direct-current motor current-limiting protection circuit comprising a single chip microcomputer unit, a drive unit, a MOS switching tube, a sampling resistor and a freewheel diode. The output end of the single chip microcomputer unit is connected with the gate of the MOS switching tube through the drive unit. The drain of the MOS switching tube is connected with the negative end of a direct-current motor M. The positive end of the direct-current motor M is connected with the positive electrode of a direct-current power source E. The source of the MOS switching tube is connected with the negative electrode of the direct-current power source E through the sampling resistor. The source of the MOS switching tube is then connected with the sampling current input end of the drive unit. The overcurrent feedback signal output end of the drive unit is connected with the input end of the single chip microcomputer unit. The freewheel diode and the direct-current motor M are in inverse parallel connection. In electrical equipment using the direct-current motor current-limiting protection circuit of the utility model, when the operation of the motor is stopped due to an excessive load, the switch does not need to be restarted, and the electrical equipment can be reoperated only by reducing the motor load, so not only advantages of convenient operation and improved working efficiency can be realized, and but also the working coherence of the electrical equipment can be maintained.
Description
Technical field
The utility model relates to direct current machine, relates in particular to a kind of direct current machine current-limiting protection circuit.
Background technology
On much electrical equipment, electrical equipment, all can use direct current machine, but when load strengthens, direct current machine there will be stall phenomenon.Hay mover for example cuts smooth and easyly in the local time that cutting grass is sparse, and in the local time that cutting grass is intensive, motor load strengthens, and there will be stall phenomenon, and under common overload protecting circuit effect, motor can stall.Chain saw and for example cuts smooth and easyly when the thin wood of cutting, and when the thick wood of cutting, motor load strengthens, and there will be stall phenomenon, and under common overload protecting circuit effect, motor can stall.Therefore, adopt the electrical equipment of above-mentioned these common overload protecting circuits, need to restart switch after stall, machine could turn round.After above-mentioned hay mover generation motor stalling, palpus trip switch, retreats hay mover, then restarts switch, and hay mover could turn round again, then cuts, but has lost company's inertia of cutting.After above-mentioned chain saw generation motor stalling, palpus trip switch, takes out chain saw, then restarts switch, and chain saw could turn round again, then removes to cut wood, but has lost company's inertia of cutting.Therefore; existing motor overload protective circuit, has reached the object of protecting motor although can make motor stalling when load strengthens, cause electrical equipment operation very inconvenient; both affect the work quality (as mowing quality or sawmilling quality) of using electrical equipment, affected again operating efficiency.
Summary of the invention
The utility model mainly solves original electrical equipment motor overload protective circuit used, making needs to restart switch after motor rotation blockage, electrical equipment could turn round again, not only cause electrical equipment operation very inconvenient, affect operating efficiency, and cause the electrical equipment can not continuous operation, and company's inertia of losing the job, the technical problem of the work quality of electrical equipment is used in impact; A kind of direct current machine current-limiting protection circuit is provided; it makes after motor stalling because load increases; do not need to restart switch; only need to reduce the load (as hay mover retreated to any or raising chain saw) of motor, just electrical equipment can turn round again, operation is very easy therefore not only to make electrical equipment; increase work efficiency; and guarantee the continuous operation of electrical equipment energy to keep company's inertia of work, improve the work quality (as improved mowing quality or sawmilling quality) of using electrical equipment.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: the utility model comprises single machine unit, driver element, MOS switching tube, sampling resistor and fly-wheel diode and provide the power conversion unit of operating voltage for single machine unit and driver element, power conversion unit is connected with DC power supply E, the output of single machine unit is connected with the input of driver element, the output of driver element is connected with the grid of MOS switching tube, the drain electrode of MOS switching tube is connected with the negative terminal of direct current machine M, the anode of direct current machine M is connected with the positive pole of described DC power supply E, the source electrode of MOS switching tube is connected through the negative pole of sampling resistor and described DC power supply E, one end that the source electrode of sampling resistor and MOS switching tube is connected is connected with the sample rate current input of described driver element again, the overcurrent feedback signal output of driver element is connected with the input of described single machine unit, described fly-wheel diode and described direct current machine M reverse parallel connection.By single machine unit, send signal to driver element, then by driver element, controlled the break-make of MOS switching tube, thereby automatically control operation or the stall of direct current machine.By the operating current of sampling resistor Real-time Collection direct current machine, and feed back to single machine unit by driver element, through single machine unit, process, then send signal and to driver element, control the running of direct current machine.When load is excessive, MOS switching tube turn-offs, and direct current machine and fly-wheel diode form continuous current circuit; When load reduces, the conducting of MOS switching tube, direct current machine runs well.As hay mover, because grass is too intensive, make after motor stalling, do not need to restart switch, only hay mover need to be retreated a bit, reduce the load of motor, just hay mover can turn round automatically again, continue to push ahead and cut, thus company's inertia that assurance is mowed.As chain saw, because wood too slightly makes after motor stalling, do not need to restart switch, only chain saw need to be raised a bit, reduce the load of motor, just chain saw can turn round automatically again, continue to cut downwards, thus company's inertia that assurance is sawed wood.Therefore, use electrical equipment of the present utility model, at motor, because of load, after excessive stall, do not need to restart switch, only need to reduce the load (as hay mover retreated to any or raising chain saw) of motor, just electrical equipment can turn round again.Operation is very easy not only to make electrical equipment, increases work efficiency, and guarantee the continuous operation of electrical equipment energy, keeps company's inertia of work, improves the work quality (as improved mowing quality or sawmilling quality) of using electrical equipment.
As preferably, described single machine unit comprises single-chip microcomputer U1, and single-chip microcomputer U1 adopts CS98P173 single-chip microcomputer; Described driver element comprises and drives chip U2 and resistance R 6, resistance R 7, resistance R 8, capacitor C 3, drives chip U2 to adopt IR2121 to drive chip; 5 pin of single-chip microcomputer U1 are connected with 2 pin of driving chip U2 through resistance R 6,7 pin of driving chip U2 are connected with the grid of described MOS switching tube, one end that the source electrode of described sampling resistor and MOS switching tube is connected is connected with driving 6 pin of chip U2,4 pin that drive chip U2 and 5 pin are all connected with the negative pole of described DC power supply E, drive 3 pin of chip U2, one tunnel is connected through 6 pin of resistance R 7 and single-chip microcomputer U1, another road is connected with the negative pole of DC power supply E through capacitor C 3, and 6 pin of single-chip microcomputer U1 are connected with the negative pole of DC power supply E through resistance R 8.Circuit structure is simple, and reliability is high, and it is convenient to realize.
As preferably, described MOS switching tube comprises metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, and described sampling resistor comprises resistance R D1 and resistance R D2, and described fly-wheel diode comprises diode D5 and diode D6, the grid of metal-oxide-semiconductor Q5 is connected with one end of resistance R 1, the grid of metal-oxide-semiconductor Q6 is connected with one end of resistance R 2, the other end of the other end of resistance R 1 and resistance R 2 also connects and is connected with the output of described driver element, the source electrode of metal-oxide-semiconductor Q5 is connected with the negative pole of DC power supply E through resistance R D1, the source electrode of metal-oxide-semiconductor Q6 is connected with the negative pole of DC power supply E through resistance R D2, the source electrode of metal-oxide-semiconductor Q5 is connected with one end of resistance R 3 again, the source electrode of metal-oxide-semiconductor Q6 is connected with one end of resistance R 4 again, the other end of the other end of resistance R 3 and resistance R 4 also connects and is connected with the sample rate current input of described driver element, the drain electrode of metal-oxide-semiconductor Q5 is connected with the positive pole of diode D5, the drain electrode of metal-oxide-semiconductor Q6 is connected with the positive pole of diode D6, the positive pole of diode D5 and diode D6 anodal also connects and is connected with the negative terminal of described direct current machine M, the negative pole of the negative pole of diode D5 and diode D6 also connects and is connected with the anode of described direct current machine M.The technical program adopts the structure of two metal-oxide-semiconductor parallel connections, and the number of sampling resistor, fly-wheel diode and the number of metal-oxide-semiconductor are consistent, and three is corresponding being connected one by one.When direct current machine electric current is very large, the structure that can adopt a plurality of metal-oxide-semiconductors, sampling resistor and fly-wheel diode to be connected; When direct current machine electric current is little, the structure that also can adopt single metal-oxide-semiconductor, sampling resistor and fly-wheel diode to be connected.
As preferably, described MOS switching tube comprises metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, and described sampling resistor comprises resistance R D1 and resistance R D2, and described fly-wheel diode comprises diode D5 and diode D6, the grid of metal-oxide-semiconductor Q5 is connected with one end of resistance R 1, the grid of metal-oxide-semiconductor Q6 is connected with one end of resistance R 2, the other end of the other end of resistance R 1 and resistance R 2 also connects and is connected with 7 pin of described driving chip U2, the source electrode of metal-oxide-semiconductor Q5 is connected with the negative pole of DC power supply E through resistance R D1, the source electrode of metal-oxide-semiconductor Q6 is connected with the negative pole of DC power supply E through resistance R D2, the source electrode of metal-oxide-semiconductor Q5 is connected with one end of resistance R 3 again, the source electrode of metal-oxide-semiconductor Q6 is connected with one end of resistance R 4 again, the other end of the other end of resistance R 3 and resistance R 4 also connects and is connected with 6 pin of described driving chip U2, the drain electrode of metal-oxide-semiconductor Q5 is connected with the positive pole of diode D5, the drain electrode of metal-oxide-semiconductor Q6 is connected with the positive pole of diode D6, the positive pole of diode D5 and diode D6 anodal also connects and is connected with the negative terminal of described direct current machine M, the negative pole of the negative pole of diode D5 and diode D6 also connects and is connected with the anode of described direct current machine M.The technical program adopts the structure of two metal-oxide-semiconductor parallel connections, and the number of sampling resistor, fly-wheel diode and the number of metal-oxide-semiconductor are consistent, and three is corresponding being connected one by one.When direct current machine electric current is very large, the structure that can adopt a plurality of metal-oxide-semiconductors, sampling resistor and fly-wheel diode to be connected; When direct current machine electric current is little, the structure that also can adopt single metal-oxide-semiconductor, sampling resistor and fly-wheel diode to be connected.
As preferably, described direct current machine current-limiting protection circuit comprises K switch, relay J K and triode Q3, one end of K switch is connected with the positive pole of described DC power supply E, the other end of K switch is connected with the input of described power conversion unit, the anode of the drive end of relay J K is connected with the positive pole of described DC power supply E, the negative terminal of the drive end of relay J K is connected with the collector electrode of triode Q3, the emitter of triode Q3 is connected with the negative pole of DC power supply E, the base stage of triode Q3 is connected through 3 pin of resistance R 9 and single-chip microcomputer U1, the positive pole of diode D1 is connected with the negative terminal of the drive end of relay J K, the negative pole of diode D1 is connected with the anode of the drive end of relay J K, the common port a of the trigger switch KJ of relay J K is connected with the negative terminal of described direct current machine M, the normal-closed end b of the trigger switch KJ of relay J K is connected through the anode of brake resistance RD3 and described direct current machine M, the Chang Kaiduan c of the trigger switch KJ of relay J K is connected with the drain electrode of described MOS switching tube.By the power on/off of single-chip microcomputer and Control direct current machine, control more reliably, further motor is played a protective role.
The beneficial effects of the utility model are: use electrical equipment of the present utility model, at motor, because of load, after excessive stall, do not need to restart switch, only need to reduce the load of motor, electrical equipment just can turn round again.Operation is very easy not only to make electrical equipment, increases work efficiency, and guarantee the continuous operation of electrical equipment energy, keeps company's inertia of work, improves the work quality of using electrical equipment.The utility model circuit structure is simple, and reliability is high, and it is convenient to realize.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory syndeton block diagram of the present utility model.
Fig. 2 is a kind of circuit theory diagrams of the present utility model.
1. single machine unit in figure, 2. driver element, 3.MOS switching tube, 4. sampling resistor, 5. fly-wheel diode, 6. power conversion unit.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of direct current machine current-limiting protection circuit of the present embodiment, as shown in Figure 1, comprise single machine unit 1, driver element 2, MOS switching tube 3, sampling resistor 4 and fly-wheel diode 5 and provide the power conversion unit 6 of operating voltage for single machine unit 1 and driver element 2, power conversion unit 6 is connected with DC power supply E, the output of single machine unit 1 is connected with the input of driver element 2, the output of driver element 2 is connected with the grid of MOS switching tube 3, the drain electrode of MOS switching tube 3 is connected with the negative terminal of direct current machine M, the anode of direct current machine M is connected with the positive pole of DC power supply E, the source electrode of MOS switching tube 3 is connected with the negative pole of DC power supply E through sampling resistor 4, one end that the source electrode of sampling resistor 4 and MOS switching tube is connected is connected with the sample rate current input of driver element 2 again, the overcurrent feedback signal output of driver element 2 is connected with the input of single machine unit 1, fly-wheel diode 5 and direct current machine M reverse parallel connection.
As shown in Figure 2, single machine unit 1 comprises single-chip microcomputer U1, and single-chip microcomputer U1 adopts CS98P173 single-chip microcomputer; Driver element 2 comprises and drives chip U2 and resistance R 6, resistance R 7, resistance R 8, capacitor C 3, drives chip U2 to adopt IR2121 to drive chip; MOS switching tube 3 comprises metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, and sampling resistor 4 comprises resistance R D1 and resistance R D2, and fly-wheel diode 5 comprises diode D5 and diode D6; Power conversion unit comprises three-terminal regulator block Q1 and three-terminal regulator block Q2, and three-terminal regulator block Q1 adopts 78L12 three-terminal regulator block, and three-terminal regulator block Q2 adopts 78L05 three-terminal regulator block.The direct current machine current-limiting protection circuit of the present embodiment also comprises K switch, relay J K and triode Q3.
One end of K switch is connected with the positive pole of DC power supply E, the other end of K switch is connected with the input of three-terminal regulator block Q1 through resistance R 10, the output of three-terminal regulator block Q1 is connected with the input of three-terminal regulator block Q2, the output of three-terminal regulator block Q1 is connected with 8 pin of driving chip U2, the output of three-terminal regulator block Q2, 1 pin of one road and single-chip microcomputer U1 is connected, another road is connected with 6 pin of driving chip U2 through resistance R 5, between 1 pin of single-chip microcomputer U1 and 8 pin, be connected with resistance R 11, the input of three-terminal regulator block Q1 is connected with one end of capacitor C 5, the output of three-terminal regulator block Q1 is connected with one end of capacitor C 2, the output of three-terminal regulator block Q2 is connected with one end of capacitor C 1, the other end of capacitor C 5, the earth terminal of the other end of the other end of capacitor C 2 and capacitor C 1 and three-terminal regulator block Q1, the earth terminal of three-terminal regulator block Q2, 8 pin of single-chip microcomputer U1 are all connected with the negative pole of DC power supply E.The anode of the drive end of relay J K is connected with the positive pole of DC power supply E, the negative terminal of the drive end of relay J K is connected with the collector electrode of triode Q3, the emitter of triode Q3 is connected with the negative pole of DC power supply E, the base stage of triode Q3 is connected through 3 pin of resistance R 9 and single-chip microcomputer U1, the positive pole of diode D1 is connected with the negative terminal of the drive end of relay J K, and the negative pole of diode D1 is connected with the anode of the drive end of relay J K; The common port a of the trigger switch KJ of relay J K is connected with the negative terminal of direct current machine M, the normal-closed end b of the trigger switch KJ of relay J K is connected with the anode of direct current machine M through brake resistance RD3, the anode of direct current machine M is connected with the positive pole of DC power supply E, and the Chang Kaiduan c of the trigger switch KJ of relay J K is connected with the drain electrode of metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6.
5 pin of single-chip microcomputer U1 are connected with 2 pin of driving chip U2 through resistance R 6, drive 7 pin of chip U2, one tunnel is connected with the grid of metal-oxide-semiconductor Q5 through resistance R 1, another road is connected with the grid of metal-oxide-semiconductor Q6 through resistance R 2, the source electrode of metal-oxide-semiconductor Q5 is connected with the negative pole of DC power supply E through resistance R D1, the source electrode of metal-oxide-semiconductor Q6 is connected with the negative pole of DC power supply E through resistance R D2, the source electrode of metal-oxide-semiconductor Q5 is connected with one end of resistance R 3 again, the source electrode of metal-oxide-semiconductor Q6 is connected with one end of resistance R 4 again, the other end of the other end of resistance R 3 and resistance R 4 and connect and with drive 6 pin of chip U2 to be connected, the drain electrode of metal-oxide-semiconductor Q5 is connected with the positive pole of diode D5, the drain electrode of metal-oxide-semiconductor Q6 is connected with the positive pole of diode D6, the positive pole of diode D5 and diode D6 anodal also connects and is connected with the normal-closed end c of the trigger switch KJ of relay J K, the negative pole of the negative pole of diode D5 and diode D6 also connects and is connected with the anode of direct current machine M, in the present embodiment, diode D5 and diode D6 all adopt Schottky diode.Drive 4 pin of chip U2 to be all connected with the negative pole of DC power supply E with 5 pin, capacitor C 6 and DC power supply E are in parallel, drive 3 pin of chip U2, one tunnel is connected through 6 pin of resistance R 7 and single-chip microcomputer U1, another road is connected with the negative pole of DC power supply E through capacitor C 3,6 pin of single-chip microcomputer U1 are connected with the negative pole of DC power supply E through resistance R 8, and 7 pin of single-chip microcomputer U1 are connected with the negative pole of DC power supply E through wire jumper J, and capacitor C 4 and wire jumper J are in parallel.
The course of work: when K switch is closed, single-chip microcomputer U1 and driving chip U2 obtain electric starting working, the 3 pin output high level of single-chip microcomputer U1, make triode Q3 conducting, relay J K obtains driving voltage, Chang Kaiduan c and the common port a of the trigger switch KJ of relay J K are connected, i.e. the drain electrode of metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6 is connected with the negative terminal of direct current machine M.The 5 pin output high level signals of single-chip microcomputer U1 are given 2 pin that drive chip U2, drive the 7 pin output 12V voltages of chip U2 to metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6 conducting, the anodal output current of DC power supply E flow through the common port a of trigger switch KJ of direct current machine M, relay J K and the negative pole that normal beginning c, metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6, resistance R D1, resistance R D2 flow back to DC power supply E again, form loop, make direct current machine M running.When direct current machine M reaches maximum current overload, sampled voltage on resistance R D1 and resistance R D2 feeds back to by resistance R 3 and resistance R 46 pin that drive chip U2 respectively, once surpass the threshold voltage of setting, drive the 7 pin output low levels of chip U2 to turn-off metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, drive the 3 pin output high level signals of chip U2 to 6 pin of single-chip microcomputer U1 simultaneously, 6 pin of single-chip microcomputer U1 make the 5 pin output low level signals of single-chip microcomputer U1 to 2 pin that drive chip U2 after receiving high level signal immediately, drive 3 pin of chip U2 to get back to normal voltage 0V.When metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6 shutoff, the self inductance current of direct current machine M inductance flows out from the negative terminal of direct current machine, the common port a of the trigger switch KJ of the relay J of flowing through K and normal beginning c, diode D5 and diode D6, then flow back to the anode of direct current machine M, form continuous current circuit.After the very short time, 5 pin of single-chip microcomputer U1 are exported again high level signal to 2 pin that drive chip U2, make metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6 conducting, form another circulation, allow whole circuit with on & off operation mode, to direct current machine M, power and to limit maximum current, this continuous circulation optional frequency is selected several KHz to tens KHz.When normal mode of operation is got back in direct current machine M load reduction, the sampled voltage on resistance R D1 and resistance R D2, lower than the threshold voltage of setting, drives 3 pin of chip U2 not export high level signal to single-chip microcomputer U1, makes metal-oxide-semiconductor Q5 and the long-term conducting of metal-oxide-semiconductor Q6.If direct current machine M continuous over loading surpasses certain hour, also can select to allow the 5 pin output low level signals of single-chip microcomputer U1, direct current machine M is shut down, reach the object of protection direct current machine.When K switch disconnects, relay J K discharges, the trigger switch KJ of relay J K common port a and normal beginning c closure is converted to common port a and normal-closed end b is closed during from normal work, now direct current machine M becomes a generator, rotator inertia mechanical energy is converted to electric energy, electric current flows out from the anode of direct current machine M, brake resistance RD3 flows through, the normal-closed end b of the trigger switch KJ of relay J K and openly hold a, flow back to again the negative terminal of direct current machine M, the electric discharge of formation closed-loop path, make the electric energy of direct current machine convert brake resistance RD3 to, the heat energy of motor enamel-covered wire internal resistance, thereby direct current machine is braked rapidly.
Adopt after the utility model direct current machine current-limiting protection circuit, direct current machine adopts on & off operation mode work, restriction maximum current, and the efficiency of whole circuit is high, and MOS switching tube can continuous operation consequently generate heat and be no more than maximum heat power consumption.When direct current machine electric current is very large, can adopt as required a plurality of metal-oxide-semiconductor parallel operations and a plurality of Schottky diode parallel operation; When direct current machine electric current is little, also can adopt the realization that is connected with single Schottky diode of single metal-oxide-semiconductor.
Claims (5)
1. a direct current machine current-limiting protection circuit, it is characterized in that comprising single machine unit (1), driver element (2), MOS switching tube (3), sampling resistor (4) and fly-wheel diode (5) and provide the power conversion unit (6) of operating voltage for single machine unit (1) and driver element (2), power conversion unit (6) is connected with DC power supply E, the output of single machine unit (1) is connected with the input of driver element (2), the output of driver element (2) is connected with the grid of MOS switching tube (3), the drain electrode of MOS switching tube (3) is connected with the negative terminal of direct current machine M, the anode of direct current machine M is connected with the positive pole of described DC power supply E, the source electrode of MOS switching tube (3) is connected through the negative pole of sampling resistor (4) and described DC power supply E, one end that the source electrode of sampling resistor (4) and MOS switching tube is connected is connected with the sample rate current input of described driver element (2) again, the overcurrent feedback signal output of driver element (2) is connected with the input of described single machine unit (1), described fly-wheel diode (5) and described direct current machine M reverse parallel connection.
2. a kind of direct current machine current-limiting protection circuit according to claim 1, is characterized in that described single machine unit (1) comprises single-chip microcomputer U1, and single-chip microcomputer U1 adopts CS98P173 single-chip microcomputer; Described driver element (2) comprises and drives chip U2 and resistance R 6, resistance R 7, resistance R 8, capacitor C 3, drives chip U2 to adopt IR2121 to drive chip; 5 pin of single-chip microcomputer U1 are connected with 2 pin of driving chip U2 through resistance R 6,7 pin of driving chip U2 are connected with the grid of described MOS switching tube (3), one end that the source electrode of described sampling resistor (4) and MOS switching tube (3) is connected is connected with driving 6 pin of chip U2,4 pin that drive chip U2 and 5 pin are all connected with the negative pole of described DC power supply E, drive 3 pin of chip U2, one tunnel is connected through 6 pin of resistance R 7 and single-chip microcomputer U1, another road is connected with the negative pole of DC power supply E through capacitor C 3, and 6 pin of single-chip microcomputer U1 are connected with the negative pole of DC power supply E through resistance R 8.
3. a kind of direct current machine current-limiting protection circuit according to claim 1, it is characterized in that described MOS switching tube (3) comprises metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, described sampling resistor (4) comprises resistance R D1 and resistance R D2, and described fly-wheel diode (5) comprises diode D5 and diode D6, the grid of metal-oxide-semiconductor Q5 is connected with one end of resistance R 1, the grid of metal-oxide-semiconductor Q6 is connected with one end of resistance R 2, the other end of the other end of resistance R 1 and resistance R 2 also connects and is connected with the output of described driver element (2), the source electrode of metal-oxide-semiconductor Q5 is connected with the negative pole of DC power supply E through resistance R D1, the source electrode of metal-oxide-semiconductor Q6 is connected with the negative pole of DC power supply E through resistance R D2, the source electrode of metal-oxide-semiconductor Q5 is connected with one end of resistance R 3 again, the source electrode of metal-oxide-semiconductor Q6 is connected with one end of resistance R 4 again, the other end of the other end of resistance R 3 and resistance R 4 also connects and is connected with the sample rate current input of described driver element (2), the drain electrode of metal-oxide-semiconductor Q5 is connected with the positive pole of diode D5, the drain electrode of metal-oxide-semiconductor Q6 is connected with the positive pole of diode D6, the positive pole of diode D5 and diode D6 anodal also connects and is connected with the negative terminal of described direct current machine M, the negative pole of the negative pole of diode D5 and diode D6 also connects and is connected with the anode of described direct current machine M.
4. a kind of direct current machine current-limiting protection circuit according to claim 2, it is characterized in that described MOS switching tube (3) comprises metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q6, described sampling resistor (4) comprises resistance R D1 and resistance R D2, and described fly-wheel diode (5) comprises diode D5 and diode D6, the grid of metal-oxide-semiconductor Q5 is connected with one end of resistance R 1, the grid of metal-oxide-semiconductor Q6 is connected with one end of resistance R 2, the other end of the other end of resistance R 1 and resistance R 2 also connects and is connected with 7 pin of described driving chip U2, the source electrode of metal-oxide-semiconductor Q5 is connected with the negative pole of DC power supply E through resistance R D1, the source electrode of metal-oxide-semiconductor Q6 is connected with the negative pole of DC power supply E through resistance R D2, the source electrode of metal-oxide-semiconductor Q5 is connected with one end of resistance R 3 again, the source electrode of metal-oxide-semiconductor Q6 is connected with one end of resistance R 4 again, the other end of the other end of resistance R 3 and resistance R 4 also connects and is connected with 6 pin of described driving chip U2, the drain electrode of metal-oxide-semiconductor Q5 is connected with the positive pole of diode D5, the drain electrode of metal-oxide-semiconductor Q6 is connected with the positive pole of diode D6, the positive pole of diode D5 and diode D6 anodal also connects and is connected with the negative terminal of described direct current machine M, the negative pole of the negative pole of diode D5 and diode D6 also connects and is connected with the anode of described direct current machine M.
5. according to a kind of direct current machine current-limiting protection circuit described in claim 2 or 4, it is characterized in that comprising K switch, relay J K and triode Q3, one end of K switch is connected with the positive pole of described DC power supply E, the other end of K switch is connected with the input of described power conversion unit (6), the anode of the drive end of relay J K is connected with the positive pole of described DC power supply E, the negative terminal of the drive end of relay J K is connected with the collector electrode of triode Q3, the emitter of triode Q3 is connected with the negative pole of DC power supply E, the base stage of triode Q3 is connected through 3 pin of resistance R 9 and single-chip microcomputer U1, the positive pole of diode D1 is connected with the negative terminal of the drive end of relay J K, the negative pole of diode D1 is connected with the anode of the drive end of relay J K, the common port a of the trigger switch KJ of relay J K is connected with the negative terminal of described direct current machine M, the normal-closed end b of the trigger switch KJ of relay J K is connected through the anode of brake resistance RD3 and described direct current machine M, the Chang Kaiduan c of the trigger switch KJ of relay J K is connected with the drain electrode of described MOS switching tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420082217.7U CN203734586U (en) | 2014-02-26 | 2014-02-26 | Direct-current motor current-limiting protection circuit |
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| CN201420082217.7U CN203734586U (en) | 2014-02-26 | 2014-02-26 | Direct-current motor current-limiting protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944487A (en) * | 2014-02-26 | 2014-07-23 | 上虞市冠业电器有限公司 | Current limiting protective circuit for DC motor |
| CN107453683A (en) * | 2016-05-25 | 2017-12-08 | 操纵技术Ip控股公司 | The source current limitation of DC motors |
| CN112713843A (en) * | 2020-12-25 | 2021-04-27 | 珠海格力电器股份有限公司 | Control method and control device of motor |
-
2014
- 2014-02-26 CN CN201420082217.7U patent/CN203734586U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944487A (en) * | 2014-02-26 | 2014-07-23 | 上虞市冠业电器有限公司 | Current limiting protective circuit for DC motor |
| CN107453683A (en) * | 2016-05-25 | 2017-12-08 | 操纵技术Ip控股公司 | The source current limitation of DC motors |
| CN107453683B (en) * | 2016-05-25 | 2021-10-26 | 操纵技术Ip控股公司 | Method and system for controlling or managing a DC motor |
| US11290042B2 (en) | 2016-05-25 | 2022-03-29 | Steering Solutions Ip Holding Corporation | Supply current limiting of DC machines |
| CN112713843A (en) * | 2020-12-25 | 2021-04-27 | 珠海格力电器股份有限公司 | Control method and control device of motor |
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