CN208386134U - A kind of hardware current-limiting protection circuit of motor - Google Patents
A kind of hardware current-limiting protection circuit of motor Download PDFInfo
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- CN208386134U CN208386134U CN201820995548.8U CN201820995548U CN208386134U CN 208386134 U CN208386134 U CN 208386134U CN 201820995548 U CN201820995548 U CN 201820995548U CN 208386134 U CN208386134 U CN 208386134U
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Abstract
The utility model provides a kind of hardware current-limiting protection circuit of motor; it is exported by limit detection circuit detection switch pipe to the size of current of motor; when current is excessive; after the output signal of the limit detection circuit will be by the processing of signal processing circuit; it is compared in comparison circuit with preset reference signal; and then the power supply for motor is cut off by protection driving circuit control switch pipe shutdown by the output signal of comparison circuit；The application realizes the current-limiting protection for motor with hardware controls, avoids and realizes the low problem of reliability brought by motor current-limiting protection using software control in the prior art.
Description
Technical field
The utility model relates to technical field of photovoltaic power generation, in particular to the hardware current-limiting protection circuit of a kind of motor.
Background technique
Current photovoltaic tracking system, mainly by the motor driven main axis being installed on tracking bracket, thus
The photovoltaic module rotation installed on main shaft is driven, and then achievees the purpose that track the sun.
At work, can exist is caused to track deformation of timbering or has sundries resistance above-mentioned photovoltaic tracking system by mechanical stress
Gear, limit switch failure, cause motor to be stuck and the phenomenon that stall occur.When motor works normally, electric energy is converted into electromagnetic energy
It is then converted to kinetic energy；And when motor rotation blockage, electric energy has then been completely converted into thermal energy.Motor is equivalent to a copper wire at this time, directly
Cause electric current very big since the resistance value of motor is very low power supply short circuit, stall motor generate amount of heat, and radiate it is bad or
Motor copper wire, which can not be resistant to high current and will will lead to motor, to be burnt.
In order to protect motor not burn because of stall, generally use software control scheme in the prior art realize for
The current-limiting protection of motor, but inevitably there is the hidden danger of program exception in software control scheme, cause the reliability of current-limiting protection low.
Utility model content
The utility model provides a kind of hardware current-limiting protection circuit of motor, and to solve, reliability is low in the prior art is asked
Topic.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of hardware current-limiting protection circuit of motor, comprising: switching tube, signal processing circuit, compares limit detection circuit
Circuit and protection driving circuit；Wherein:
The input terminal of the switching tube is connected with DC power supply；
The output end of the switching tube is motor power supply by the limit detection circuit；
The output end of the limit detection circuit is connected with the input terminal of the signal processing circuit；
The output end of the signal processing circuit is connected with the input cathode of the comparison circuit；The comparison circuit
Input anode receives preset reference signal；
The output end of the comparison circuit is connected with the input terminal of the protection driving circuit；
The output end of the protection driving circuit is connected with the control terminal of the switching tube.
Preferably, the limit detection circuit includes: current divider, first resistor, second resistance and first capacitor；Wherein:
One end of the current divider is connected with the output end of the switching tube and with reference to ground；
The other end of the current divider is connected with one end of one end of the first resistor and the second resistance, tie point
For motor power supply；
The other end of the first resistor is connected with one end of the first capacitor, tie point ground connection；
The other end of the first capacitor is connected with the other end of the second resistance, and tie point is current limliting detection electricity
The output end on road is connected with the input cathode of the signal processing circuit, and the input anode of the signal processing circuit connects
Receive reference signal；The reference signal is the voltage value of the DC power supply.
Preferably, the limit detection circuit are as follows: current transformer；
The output end of the switching tube passes through the current transformer as motor power supply；
The output head anode of the current transformer is connected with the input anode of the signal processing circuit；
The negative pole of output end of the current transformer is connected with the input cathode of the signal processing circuit.
Preferably, the signal processing circuit is ratio circuit.
Preferably, the signal processing circuit is integrating circuit or proportional integral circuit.
Preferably, the comparison circuit includes: comparator, the 6th resistance, the 7th resistance, the 8th resistance, the 4th capacitor,
Five capacitors and the 6th capacitor；Wherein:
One end of 7th resistance is the input anode of the comparison circuit；
The other end of 7th resistance is connected with one end of the non-inverting input terminal of the comparator and the 5th capacitor；
The other end of 5th capacitor is grounded；
One end of 6th resistance is the input cathode of the comparison circuit；
The other end of 6th resistance is connected with one end of the inverting input terminal of the comparator and the 4th capacitor；
The other end of 4th capacitor is connected with one end of the ground terminal of the comparator and the 6th capacitor, connection
Point is connected with reference to ground；
The other end of 6th capacitor is connected with the output end of one end of the 8th resistance and the comparator, connection
Point is the output end of the comparison circuit；
The other end of 8th resistance is connected with the feeder ear of the comparator, and tie point is connected with the first power supply.
Preferably, the protection driving circuit includes: the first optocoupler, driving chip, the 9th resistance, the tenth resistance, the tenth
One resistance, the 7th capacitor, the 8th capacitor and first diode；Wherein:
The input terminal of the just extremely described protection driving circuit of first optocoupler；
The cathode of first optocoupler is connected by the 9th resistance with reference to ground；
One end of the collector of first optocoupler and the tenth resistance, one end of the 7th capacitor and the driving
The HIN pin of chip is connected；
The emitter of first optocoupler is connected with reference to ground；
The other end of tenth resistance and the other end of the 7th capacitor, the Vss pin of the driving chip and institute
The anode for stating first diode is connected, and tie point is connected with the first power supply；
The V of the cathode of the first diode and the driving chipBOne end of pin and the 8th capacitor is connected；
The other end of 8th capacitor and the V of the driving chipSPin is connected；
The HO pin of the driving chip is connected with one end of the eleventh resistor；
The other end of the eleventh resistor is the output end of the protection driving circuit；
The LIN cathode and LO pin floating of the driving chip, the COM pin of the driving chip are connected with reference to ground.
Preferably, the switching tube is Metal Oxide Semiconductor Field Effect Transistor.
Preferably, further includes: audible and visual alarm circuit；The input terminal of the audible and visual alarm circuit is defeated with the comparison circuit
Outlet is connected.
Preferably, the audible and visual alarm circuit includes: the second optocoupler, twelfth resistor, thirteenth resistor, the 14th electricity
Resistance, the 15th resistance, triode, the second diode, indicator light and buzzer；Wherein:
The input terminal of the just extremely described audible and visual alarm circuit of second optocoupler；
The cathode of second optocoupler is connected by the twelfth resistor with reference to ground；
The collector of second optocoupler is connected with the first power supply；
The emitter of second optocoupler is connected with the base stage of one end of the thirteenth resistor and the triode；
The other end of the thirteenth resistor is connected with reference to ground；
The collector of the triode is connected by second diode with the first power supply；
The emitter of the triode is connected by the 14th resistance with reference to ground；
The both ends of the buzzer are connected with the anode and cathode of second diode respectively；
The anode of the indicator light is connected with the cathode of second diode；
The cathode of the indicator light is connected by the 15th resistance with reference to ground.
The hardware current-limiting protection circuit of motor provided by the utility model is exported by limit detection circuit detection switch pipe
To the size of current of motor, when current is excessive, the output signal of the limit detection circuit will pass through signal processing circuit
It after processing, is compared in comparison circuit with preset reference signal, and then protection is passed through by the output signal of comparison circuit
The shutdown of driving circuit control switch pipe, cuts off the power supply for motor；The application realizes the current limliting for motor with hardware controls
Protection avoids and realizes the low problem of reliability brought by motor current-limiting protection using software control in the prior art.
Detailed description of the invention
It, below will be to embodiment in order to illustrate more clearly of the technical solution in the utility model embodiment or the prior art
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, interior attached drawing is described below only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the hardware current-limiting protection circuit of motor provided by the embodiment of the utility model；
Fig. 2 a and Fig. 2 b are two kinds of electricity of the hardware current-limiting protection circuit for the motor that another embodiment of the utility model provides
Lu Tu；
Fig. 3 is another circuit diagram of the hardware current-limiting protection circuit for the motor that another embodiment of the utility model provides；
Fig. 4 is another circuit diagram of the hardware current-limiting protection circuit for the motor that another embodiment of the utility model provides.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The utility model provides a kind of hardware current-limiting protection circuit of motor, and to solve, reliability is low in the prior art is asked
Topic.
Referring to Figure 1, the hardware current-limiting protection circuit of the motor includes: switching tube Q1, limit detection circuit 101, signal
Processing circuit 102, comparison circuit 103 and protection driving circuit 104；Wherein:
The input terminal of switching tube Q1 is connected with DC power supply (voltage V_DC)；
The output end of switching tube Q1 is motor power supply, supply voltage V_out by limit detection circuit 101；
The output end of limit detection circuit 101 is connected with the input terminal of signal processing circuit 102；
The output end of signal processing circuit 102 is connected with the input cathode of comparison circuit 103；Comparison circuit 103 it is defeated
Enter proper pole and receives preset reference signal Vf2；
The output end of comparison circuit 103 is connected with the input terminal of protection driving circuit 104；
The output end of protection driving circuit 104 is connected with the control terminal of switching tube Q1.
Preferably, switching tube Q1 is Metal Oxide Semiconductor Field Effect Transistor, i.e. metal-oxide-semiconductor.
Specific working principle are as follows:
Switching tube Q1 can power in the on-state by motor of the electric power that DC power supply exports；It is exported in switching tube Q1
The limit detection circuit 101 of end setting is able to detect switching tube Q1 and exports to the size of current of motor；It is logical when flowing through switching tube Q1
Cross limit detection circuit 101 be motor power supply electric current it is excessive when, the output signal of the limit detection circuit 101 will pass through letter
Number processing circuit 102 is handled, and the signal obtained after handling will in comparison circuit 103 with preset reference signal
Vf2 is compared, excessive by the output signal characterization current of electric of comparison circuit 103；At this point, the output of comparison circuit 103 is believed
Number will be by protection 104 control switch pipe Q1 of driving circuit shutdown, and then cut off power supply of the DC power supply for motor.
The hardware current-limiting protection circuit of the motor provided in this embodiment by the above process can be with pure hardware circuit
It realizes the current-limiting protection for motor, avoids and realize that motor current-limiting can brought by protecting using software control in the prior art
The problem low by property.
It is worth noting that the motor being previously mentioned in the present embodiment, the motor being not limited in photovoltaic tracking system, also
It can be the motor in other DC micro-motors, such as photovoltaic purging system, it can be using above-mentioned hardware current-limiting protection electricity
Realize current-limiting protection in road.
Another embodiment of the utility model additionally provides a kind of hardware current-limiting protection circuit of specific motor, in above-mentioned reality
On the basis for applying example and Fig. 1, the specific implementation form of each circuit is given:
Optionally, as shown in Figure 2 a, limit detection circuit 101 includes: current divider, first resistor R1, second resistance R2
And first capacitor C1；Wherein:
One end of current divider is connected with the output end of switching tube Q1 and with reference to ground GND1；
The other end of current divider is connected with one end of one end of first resistor R1 and second resistance R2, and tie point is motor confession
Electricity；
The other end of first resistor R1 is connected with one end of first capacitor C1, and tie point is grounded GND；
The other end of first capacitor C1 is connected with the other end of second resistance R2, and tie point is limit detection circuit 101
Output end is connected with the input cathode of signal processing circuit 102, and the input anode of signal processing circuit 102 receives reference
Signal Vf1.
Optionally, signal processing circuit 102 is ratio circuit.
Specifically, as shown in Figure 2 a, which includes: 3rd resistor R3, the 4th resistance R4, the 5th electricity
Hinder R5, resistance R16, the second capacitor C2 and comparator Q2；Wherein:
One end of 4th resistance R4 is connected with one end of the second capacitor C2, and tie point is the defeated of the signal processing circuit 102
Enter proper pole；
The other end of 4th resistance R4 is connected with the non-inverting input terminal of one end of the 5th resistance R5 and comparator Q2；
The other end of second capacitor C2 and the other end of the 5th resistance R5 are grounded GND；
One end of 3rd resistor R3 is the input cathode of the signal processing circuit 102；
The other end of 3rd resistor R3 is connected with the inverting input terminal of one end of resistance R16 and comparator Q2；
The other end of resistance R16 is connected with the output end of comparator Q2；
The feeder ear of comparator Q2 is connected with second source, receives voltage VCC2；
The ground terminal of comparator Q2 is grounded GND.
Optionally, comparison circuit 103 includes: comparator Q3, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 4th
Capacitor C4, the 5th capacitor C5 and the 6th capacitor C6；Wherein:
One end of 7th resistance R7 is the input anode of comparison circuit 103；
The other end of 7th resistance R7 is connected with one end of the non-inverting input terminal of comparator Q3 and the 5th capacitor C5；
The other end of 5th capacitor C5 is grounded GND；
One end of 6th resistance R6 is the input cathode of comparison circuit 103；
The other end of 6th resistance R6 is connected with one end of the inverting input terminal of comparator Q3 and the 4th capacitor C4；
The other end of 4th capacitor C4 is connected with the one end at the ground connection end GND of comparator Q3 and the 6th capacitor C6, tie point
With reference GND1 is connected；
The other end of 6th capacitor C6 is connected with the output end of one end of the 8th resistance R8 and comparator Q3, tie point be than
Compared with the output end of circuit 103；
The other end of 8th resistance R8 is connected with the feeder ear of comparator Q3, tie point and the first power supply (voltage VCC1)
It is connected.
Optionally, protection driving circuit 104 includes: the first optocoupler E1, driving chip N1, the 9th resistance R9, the tenth resistance
R10, eleventh resistor R11, the 7th capacitor C7, the 8th capacitor C8 and first diode D1；Wherein:
The input terminal for just extremely protecting driving circuit 104 of first optocoupler E1；
The cathode of first optocoupler E1 is connected by the 9th resistance R9 with reference to ground GND1；
One end of the collector of first optocoupler E1 and the tenth resistance R10, one end of the 7th capacitor C7 and driving chip N1
HIN pin is connected；
The emitter of first optocoupler E1 is connected with reference to ground GND1；
The other end of the other end of tenth resistance R10 and the 7th capacitor C7, the Vss pin of driving chip N1 and the one or two pole
The anode of pipe D1 is connected, and tie point is connected with the first power supply (voltage VCC1)；
The cathode of first diode D1 is connected with one end of the VB pin of driving chip N1 and the 8th capacitor C8；
The other end of 8th capacitor C8 is connected with the VS pin of driving chip N1；
The HO pin of driving chip N1 is connected with one end of eleventh resistor R11；
The other end of eleventh resistor R11 is the output end for protecting driving circuit 104；
The LIN cathode and LO pin floating of driving chip N1, the COM pin of driving chip N1 are connected with reference to ground GND1.
Circuit shown in Fig. 2 a, specific working principle are as follows:
When switching tube Q1 conducting, V_DC ≈ V_out, V_out are for giving motor to power.
Ra, Rb in limit detection circuit 101 are the equivalent resistance of current divider, can detect first resistor in normal power supply
The voltage of R1 determines the sum of the electric current for then flowing through resistance Ra, Rb with this.As shown in Figure 2 a, when switching tube Q1 is connected,
If R1 both end voltage is V1, it is smaller to flow through the more big then voltage V1 of the sum of electric current of resistance Ra, Rb；Wherein reference signal Vf1 is straight
The partial pressure value for flowing supply voltage V_DC illustrates that motor is in stifled at this time when resistance, which flows through the sum of Ra, Rb electric current, reaches threshold value Ip
Turn state, is configured further according to size of the threshold value Ip to reference signal Vf1.
Then, by signal processing circuit 102 will difference (Vf1-V1) carry out differential amplification after obtain voltage V2, and by the electricity
Pressure V2 is exported to the input cathode of comparison circuit 103.
The output signal V2 of signal processing circuit 102 is compared by comparison circuit 103 with preset reference signal Vf2；And
And as Vf2 > V2, comparator Q3 output voltage is high level (i.e. voltage VCC1), provides high electricity for protection driving circuit 104
Flat output signal；As Vf2 < V2, comparator Q3 output voltage is low level.
In protection driving circuit 104, if comparator Q3 output high level voltage is VCC1, the first optocoupler E1 conducting；
And when the first optocoupler E1 conducting, the HIN pin of driving chip N1 is pulled low；At this point, the source voltage of deleting of switching tube Q1 is unsatisfactory for
Turn-on condition, then switching tube Q1 will turn off, and cut off the power supply circuit of motor, realize the current-limiting protection for motor.
And if comparator Q3 output voltage is low level, the first optocoupler E1 is not turned on, the HIN pin of driving chip N1
Output signal is high level, and switching tube Q1 keeps constant conduction state, is powered for motor.
In addition, the limit detection circuit 101 in above topology may be: current transformer (as shown in Figure 2 b)；
At this point, the output end of switching tube Q1 passes through current transformer as motor power supply, output voltage V_out；Electric current is mutual
The output head anode of sensor is connected with the input anode of signal processing circuit 102；The negative pole of output end and letter of current transformer
The input cathode of number processing circuit 102 is connected.
It, specifically can be depending on its application environment, in the guarantor of the application about the structure composition of limit detection circuit 101
It protects in range.
Moreover, in practical application optocoupler can also be replaced to realize driving, herein not using triode and its peripheral circuit
It is specifically limited, depending on its application environment, within the scope of protection of this application.
In addition, driving chip N1 can be any metal-oxide-semiconductor driving chip, also it is not specifically limited herein, depending on its application
Depending on environment, within the scope of protection of this application.
Remaining principle is same as the previously described embodiments, no longer repeats one by one herein.
It is worth noting that in practical applications, motor may be due to being caused out when rotating by of short duration resistance
There is of short duration overcurrent in the output for closing pipe Q1, and the hardware current-limiting protection circuit is equally understood on-off switching tube Q1, cut in this case
The disconnected power supply to motor, causes relevant device that can not continue to work normally；But actual conditions are, if do not cut off to motor
Power supply, after the of short duration resistance disappears, motor still can be operated normally.
Therefore, it is happened in order to avoid such, another embodiment of the utility model provides the hard of another motor
Part current-limiting protection circuit, referring to Fig. 3:
Its limit detection circuit 101 includes: current divider, first resistor R1, second resistance R2 and first capacitor C1；
Its comparison circuit 103 includes: comparator Q3, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 4th capacitor
C4, the 5th capacitor C5 and the 6th capacitor C6；
It includes: the first optocoupler E1, driving chip N1, the 9th resistance R9, the tenth resistance R10, that it, which protects driving circuit 104,
11 resistance R11, the 7th capacitor C7, the 8th capacitor C8 and first diode D1；
Alternatively, the limit detection circuit 101 or current transformer are (referring to fig. 2 b)；It, can also and in practical application
Driving is realized to replace optocoupler using triode and its peripheral circuit；Meanwhile driving chip N1 can drive for any metal-oxide-semiconductor
Chip.It is not specifically limited herein, depending on its application environment, within the scope of protection of this application.
Specific connection relationship is identical as Fig. 2 a or Fig. 2 b illustrated embodiment inside each circuit and between each circuit,
It no longer repeats one by one herein.
The present embodiment is compared to embodiment shown in Fig. 2 a and Fig. 2 b, it is preferred that its signal processing circuit 102 is integral electricity
Road, rather than ratio circuit；The resistance R16 being embodied in signal processing circuit 102 shown in Fig. 2 a and Fig. 2 b is changed to Fig. 3
In third capacitor C3 (Fig. 3 carries out difference displaying on the basis of for Fig. 2 a).
In the present embodiment, when occurring stall in the short time, integrating circuit carries out integral feedback inspection by third capacitor C3
It surveys, only when stall time reaches integration time constant τ, the amplification output voltage of comparator Q2 can be only achieved comparison circuit
The operation condition of comparator Q3 in 103, to pass through protection 104 on-off switching tube Q1 of driving circuit.
The present embodiment on the basis of above-described embodiment, by the setting of integrating circuit so that hardware current-limiting protection electricity
In the case that road can allow for motor the stall of short period occur, for example motor is slowly rotated because encountering larger resistance, when
Its electric current is more than a certain threshold value and when the time cumulation that is more than reaches another threshold value, which just can be to electricity
Machine realizes power-off protection.
In addition, the integrating circuit in proportional integral circuit alternate figures 3 can also be used in practical application, as shown in Figure 4:
In one resistance R17 of the both ends of third capacitor C3 parallel connection；At this point, add into ratio circuit only affect feedback
Response time setting value, integrating circuit principle is identical, and details are not described herein again.
About the specific implementation form of signal processing circuit 102, herein without limitation, can depending on its application environment,
Within the scope of protection of this application.
Remaining structure and principle are same as the previously described embodiments, no longer repeat one by one herein.
Another embodiment of the utility model additionally provides the hardware current-limiting protection circuit of another motor, in above-mentioned implementation
On the basis of example and Fig. 1 to Fig. 3, it is preferred that the hardware current-limiting protection circuit of the motor further include: audible and visual alarm circuit 105；
The input terminal of audible and visual alarm circuit 105 is connected with the output end of comparison circuit 103.
A and Fig. 3 referring to fig. 2, the audible and visual alarm circuit 105 include: the second optocoupler E2, twelfth resistor R12, the 13rd electricity
Hinder R13, the 14th resistance R14, the 15th resistance R15, triode Q4, the second diode D2, indicator light L1 and buzzer M1；Its
In:
The just extremely input terminal of audible and visual alarm circuit 105 of second optocoupler E2；
The cathode of second optocoupler E2 is connected by twelfth resistor R12 with reference to ground GND1；
The collector of second optocoupler E2 is connected with the first power supply (voltage VCC1)；
The emitter of second optocoupler E2 is connected with the base stage of one end of thirteenth resistor R13 and triode Q4；
The other end of thirteenth resistor R13 is connected with reference to ground GND1；
The collector of triode Q4 is connected by the second diode D2 with the first power supply (voltage VCC1)；
The emitter of triode Q4 is connected by the 14th resistance R14 with reference to ground GND1；
The both ends of buzzer M1 are connected with the anode and cathode of the second diode D2 respectively；
The anode of indicator light L1 is connected with the cathode of the second diode D2；
The cathode of indicator light L1 is connected by the 15th resistance R15 with reference to ground GND1.
When the output signal of comparator Q3 is high level, illustrate that motor has generated blocking phenomenon at this time, this high level
Output signal will so that the second optocoupler E2 be connected.
Since optocoupler driving capability is weak (electric current is small), therefore it is indicator light L1 and buzzer M1 that triode Q4 driving circuit, which is added,
Power supply.When the second optocoupler E2 conducting, triode Q4 conducting, at this time indicator light L1 and buzzer M1 work carries out audible and visual alarm.
Remaining structure and principle are same as the previously described embodiments, no longer repeat one by one herein.
Each embodiment is described in a progressive manner in the utility model, the highlights of each of the examples are with its
The difference of his embodiment, the same or similar parts in each embodiment may refer to each other.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation.Although the utility model has been disclosed with preferred embodiment as above, it is not intended to limit the utility model.It is any ripe
Those skilled in the art is known, in the case where not departing from technical solutions of the utility model ambit, all using the side of the disclosure above
Method and technology contents make many possible changes and modifications to technical solutions of the utility model, or be revised as equivalent variations etc.
Imitate embodiment.Therefore, all contents without departing from technical solutions of the utility model, according to the technical essence of the utility model to
Any simple modifications, equivalents, and modifications that upper embodiment is done still fall within the model of technical solutions of the utility model protection
In enclosing.
Claims (10)
1. a kind of hardware current-limiting protection circuit of motor characterized by comprising switching tube, limit detection circuit, signal processing
Circuit, comparison circuit and protection driving circuit；Wherein:
The input terminal of the switching tube is connected with DC power supply；
The output end of the switching tube is motor power supply by the limit detection circuit；
The output end of the limit detection circuit is connected with the input terminal of the signal processing circuit；
The output end of the signal processing circuit is connected with the input cathode of the comparison circuit；The input of the comparison circuit
Rectify pole and receives preset reference signal；
The output end of the comparison circuit is connected with the input terminal of the protection driving circuit；
The output end of the protection driving circuit is connected with the control terminal of the switching tube.
2. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the limit detection circuit packet
It includes: current divider, first resistor, second resistance and first capacitor；Wherein:
One end of the current divider is connected with the output end of the switching tube and with reference to ground；
The other end of the current divider is connected with one end of one end of the first resistor and the second resistance, and tie point is institute
State motor power supply；
The other end of the first resistor is connected with one end of the first capacitor, tie point ground connection；
The other end of the first capacitor is connected with the other end of the second resistance, and tie point is the limit detection circuit
Output end is connected with the input cathode of the signal processing circuit, and the input anode of the signal processing circuit receives ginseng
Examine signal；The reference signal is the voltage value of the DC power supply.
3. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the limit detection circuit
Are as follows: current transformer；
The output end of the switching tube passes through the current transformer as motor power supply；
The output head anode of the current transformer is connected with the input anode of the signal processing circuit；
The negative pole of output end of the current transformer is connected with the input cathode of the signal processing circuit.
4. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the signal processing circuit is
Ratio circuit.
5. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the signal processing circuit is
Integrating circuit or proportional integral circuit.
6. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the comparison circuit includes:
Comparator, the 6th resistance, the 7th resistance, the 8th resistance, the 4th capacitor, the 5th capacitor and the 6th capacitor；Wherein:
One end of 7th resistance is the input anode of the comparison circuit；
The other end of 7th resistance is connected with one end of the non-inverting input terminal of the comparator and the 5th capacitor；
The other end of 5th capacitor is grounded；
One end of 6th resistance is the input cathode of the comparison circuit；
The other end of 6th resistance is connected with one end of the inverting input terminal of the comparator and the 4th capacitor；
The other end of 4th capacitor is connected with one end of the ground terminal of the comparator and the 6th capacitor, tie point with
It is connected with reference to ground；
The other end of 6th capacitor is connected with the output end of one end of the 8th resistance and the comparator, and tie point is
The output end of the comparison circuit；
The other end of 8th resistance is connected with the feeder ear of the comparator, and tie point is connected with the first power supply.
7. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the protection driving circuit packet
It includes: the first optocoupler, driving chip, the 9th resistance, the tenth resistance, eleventh resistor, the 7th capacitor, the 8th capacitor and the one or two pole
Pipe；Wherein:
The input terminal of the just extremely described protection driving circuit of first optocoupler；
The cathode of first optocoupler is connected by the 9th resistance with reference to ground；
One end of the collector of first optocoupler and the tenth resistance, one end of the 7th capacitor and the driving chip
HIN pin be connected；
The emitter of first optocoupler is connected with reference to ground；
The other end of the other end of tenth resistance and the 7th capacitor, the Vss pin of the driving chip and described the
The anode of one diode is connected, and tie point is connected with the first power supply；
The V of the cathode of the first diode and the driving chipBOne end of pin and the 8th capacitor is connected；
The other end of 8th capacitor and the V of the driving chipSPin is connected；
The HO pin of the driving chip is connected with one end of the eleventh resistor；
The other end of the eleventh resistor is the output end of the protection driving circuit；
The LIN cathode and LO pin floating of the driving chip, the COM pin of the driving chip are connected with reference to ground.
8. the hardware current-limiting protection circuit of motor according to claim 1, which is characterized in that the switching tube is metal oxygen
Compound semiconductor field effect transistor.
9. the hardware current-limiting protection circuit of -8 any motors according to claim 1, which is characterized in that further include: acousto-optic
Warning circuit；The input terminal of the audible and visual alarm circuit is connected with the output end of the comparison circuit.
10. the hardware current-limiting protection circuit of motor according to claim 9, which is characterized in that the audible and visual alarm circuit
Include: the second optocoupler, twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance, triode, the second diode,
Indicator light and buzzer；Wherein:
The input terminal of the just extremely described audible and visual alarm circuit of second optocoupler；
The cathode of second optocoupler is connected by the twelfth resistor with reference to ground；
The collector of second optocoupler is connected with the first power supply；
The emitter of second optocoupler is connected with the base stage of one end of the thirteenth resistor and the triode；
The other end of the thirteenth resistor is connected with reference to ground；
The collector of the triode is connected by second diode with the first power supply；
The emitter of the triode is connected by the 14th resistance with reference to ground；
The both ends of the buzzer are connected with the anode and cathode of second diode respectively；
The anode of the indicator light is connected with the cathode of second diode；
The cathode of the indicator light is connected by the 15th resistance with reference to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820995548.8U CN208386134U (en) | 2018-06-25 | 2018-06-25 | A kind of hardware current-limiting protection circuit of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820995548.8U CN208386134U (en) | 2018-06-25 | 2018-06-25 | A kind of hardware current-limiting protection circuit of motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208386134U true CN208386134U (en) | 2019-01-15 |
Family
ID=64964669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820995548.8U Active CN208386134U (en) | 2018-06-25 | 2018-06-25 | A kind of hardware current-limiting protection circuit of motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208386134U (en) |
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2018
- 2018-06-25 CN CN201820995548.8U patent/CN208386134U/en active Active
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Address after: 231283 602-06, Floor 6, Building 7, Independent Innovation Industry Base, No.68 Jinggang Road, Hefei Area, China (Anhui) Pilot Free Trade Zone, Anhui Province Patentee after: Renjie Intelligent Technology Co.,Ltd. Address before: 2 / F, Anhui Hua'an Seed Industry Co., Ltd., 1688 Xiyou Road, high tech Zone, Hefei City, Anhui Province, 230088 Patentee before: Hefei Renjie Intelligent Technology Co.,Ltd. |