CN103576017A - Control circuit for low temperature testing on cables - Google Patents
Control circuit for low temperature testing on cables Download PDFInfo
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- CN103576017A CN103576017A CN201210274397.4A CN201210274397A CN103576017A CN 103576017 A CN103576017 A CN 103576017A CN 201210274397 A CN201210274397 A CN 201210274397A CN 103576017 A CN103576017 A CN 103576017A
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Abstract
A control circuit for low temperature testing on cables comprises a heating module, a temperature detection module and an alternating current-direct current conversion module supplying power for the heating module and the temperature detection module. The temperature detection module detects the temperature of a motor and outputs a control signal, and the control signal controls the heating module to heat the motor to be at the temperature at which the motor can be started normally. According to the control circuit for the low temperature testing on the cables, the motor in a high-low temperature tank under a low-temperature environment can be started normally, the cables can be wound and then the testing on the cables can be completed.
Description
Technical field
The present invention relates to Motor Control Field, particularly relate to a kind of cable low-temperature test control circuit that motor is worked in the lower high-low temperature chamber of temperature.
Background technology
Along with social development, cable is being brought into play more and more important effect in fields such as electric power conveying, communications.Conventionally, the crust of cable is to make with plastics or elastomeric material, at low temperatures, easily there is cracking, hardening, the problem such as frangible, especially cable is being wound around or when crooked, the damage of more easily making paired cable, therefore, when selecting cable sheath material, need to carry out Low-Temperature Reliability test to cable.The method of testing in laboratory is: cable is put into together with being wound around rod to high-low temperature chamber the inside after freezing 4-5 hour, then high-low temperature chamber door is opened, laboratory technician is being wound around cable winding on rod fast.But, opening high-low temperature chamber behind the door, at room temperature twine, be difficult to avoid the intensification of cable, cause test data inaccurate.And laboratory technician need to put on one's gloves and be wound around, malfunction, the temperature of gloves also can cause the intensification of cable, and low temperature is easily numb with cold by hand.In addition, under low temperature, open high-low temperature chamber, hot-air enters and can impact high-low temperature chamber inside, causes the damage of high-low temperature chamber.
In order to address the above problem, can be chosen in mounted motor in high-low temperature chamber, in airtight high-low temperature chamber, utilize electric machine rotation to realize the winding of cable.But when being wound around cable, the temperature in high-low temperature chamber often low reaching-40 ℃ arrives-50 ℃, motor cannot normally start at low temperatures.And motor is wound around cable all numbers while rotating in high-low temperature chamber cannot carry out monitoring and controlling, have been difficult to test.
Summary of the invention
Based on this, be necessary the problem that cannot normally start for motor in the lower high-low temperature chamber of temperature, a kind of motor normal cable low-temperature test control circuit starting in the lower high-low temperature chamber of temperature that makes is provided.
A low-temperature test control circuit, comprising:
AC-DC conversion module, changes and exports direct current by the alternating current of input;
Temperature detecting module, comprise the thermistor, adjustable resistance and the comparer that are arranged at motor, one end of described thermistor is connected with the output terminal of described AC-DC conversion module, another termination adjustable resistance of described thermistor and the normal phase input end of comparer, the other end ground connection of described adjustable resistance; The anti-phase input termination reference voltage of described comparer, output terminal output high level or low level;
Heating module, comprise heating resistor, the first relay and the 3rd transistor for adding thermoelectric perpetual motion machine, one end of the coil of described the first relay is connected with the output terminal of described AC-DC conversion module, the 3rd transistorized input end described in another termination of described the first relay, described the 3rd transistorized output head grounding; The output terminal of comparer described in described the 3rd transistorized control termination, one end of the normally opened contact of described the first relay is connected with the output terminal of described AC-DC conversion module, one end of heating resistor described in another termination of the normally opened contact of described the first relay, the other end ground connection of described heating resistor.
Therein in an embodiment, also comprise counting module, described counting module comprises the first control module and the second control module, described the first control module comprises tongue tube, the 4th relay and the 4th transistor, and described the 4th transistor comprises input end, output terminal and controls conducting or turn-off described the 4th transistorized control end; One end of described tongue tube is connected with the output terminal of described AC-DC conversion module, the 4th transistorized control end described in another termination of described tongue tube, one end of the 4th relay coil described in described the 4th transistorized input termination, the other end of described the 4th relay coil is connected with the output terminal of described AC-DC conversion module; Described the 4th transistorized output head grounding, when the normally opened contact of described the 4th relay is closed, described the first control module generates count enable signal, and controls described counting module and once count; Described the second control module comprises the 3rd relay, counting contact, alarm actuating contact and hummer, one end, described counting contact is connected with the output terminal of described AC-DC conversion module, one end of the 3rd relay coil described in another termination of described counting contact, the other end ground connection of described the 3rd relay coil, the normally opened contact access motor main circuit of described the 3rd relay; One end of described alarm actuating contact is connected with the output terminal of described AC-DC conversion module, and the other end of described alarm actuating contact is connected with described hummer; When counting does not reach counting preset value, the described counting closing of contact, described alarm actuating contact disconnects, otherwise described counting contact disconnects, and described alarm actuating contact is closed.
Therein in an embodiment, described the first control module also comprises the 5th filter capacitor and the second pull down resistor, one end of described the 5th filter capacitor is connected in described the 4th transistorized control end, the other end ground connection of described the 5th filter capacitor, described the second pull down resistor is connected in parallel in the two ends of described the 5th filter capacitor.
In an embodiment, described the 3rd transistor AND gate the 4th transistor is field effect transistor therein.
In an embodiment, described heating module also comprises the 4th filter capacitor therein, and one end of described the 4th filter capacitor is connected with described the 3rd transistorized control end, the other end ground connection of described the 4th filter capacitor.
Therein in an embodiment, described temperature detecting module also comprises the first divider resistance, the second divider resistance and the first pull down resistor, one end of described the second divider resistance is connected with the output terminal of described AC-DC conversion module, one end of the first divider resistance and the inverting input of described comparer described in another termination of described the second divider resistance, the other end ground connection of described the first divider resistance.
Therein in an embodiment, described AC-DC conversion module comprises transformer, Qiao Dui, three-terminal voltage-stabilizing pipe, the first filter capacitor and the second filter capacitor, described three-terminal voltage-stabilizing pipe comprises input end, output terminal and earth terminal, the input end input AC electricity of described transformer, the input end of bridge heap described in output termination; The cathode output end of described bridge heap connects one end of input end and first filter capacitor of described three-terminal voltage-stabilizing pipe, cathode output end ground connection; The other end ground connection of described the first filter capacitor, one end of the second filter capacitor export direct current, the other end ground connection of described the second filter capacitor described in the output termination of described three-terminal voltage-stabilizing pipe; The earth terminal ground connection of described three-terminal voltage-stabilizing pipe.
In an embodiment, described indicating module comprises transistor seconds, phase inverter and light emitting diode therein, and described transistor seconds comprises input end, output terminal and controls conducting or turn-off the control end of described transistor seconds; The positive pole of described light emitting diode connects the output terminal of described AC-DC conversion module, negative pole connects the input end of described transistor seconds, the output terminal of phase inverter described in the control termination of described transistor seconds, the output terminal of comparer described in the input termination of described phase inverter, the output head grounding of described transistor seconds.
Therein in an embodiment, described indicating module also comprises the second relay, the 3rd filter capacitor and current-limiting resistance, one end of the coil of described the second relay is connected with the output terminal of AC-DC conversion module, the input end of transistor seconds described in another termination of the coil of described the second relay; The first normally opened contact access motor main circuit of described the second relay, the negative pole of light emitting diode described in one termination of the second normally opened contact of described the second relay, one end of current-limiting resistance described in another termination of the second normally opened contact of described the second relay, the other end ground connection of described current-limiting resistance; The control end of transistor seconds described in one termination of described the 3rd filter capacitor, the other end ground connection of described the 3rd filter capacitor.
In above-mentioned cable low-temperature test control circuit, by temperature detecting module, detect motor temperature and control during lower than the first temperature threshold and open heating module at motor temperature, motor is heated, when motor heating is controlled and closed heating module during to the second temperature threshold, after being completed, the heating of motor gets final product starter motor, with the winding of complete paired cable.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the cable low-temperature test control circuit of an embodiment.
Embodiment
In order to solve motor, in the lower high-low temperature chamber of temperature, cannot normally start, and cannot to all numbers of cable winding, carry out the problem of monitoring and controlling, a kind of motor normal cable low-temperature test control circuit starting in the lower high-low temperature chamber of temperature that makes is provided.
As described in Figure 1, the cable low-temperature test control circuit of an embodiment, comprises heating module 110, temperature detecting module 120 and AC-DC conversion module 140.
AC-DC conversion module 140, changes and exports direct current by the alternating current of input.So that heating module 110, temperature detecting module 120 are powered.
In above-mentioned cable low-temperature test control circuit, by the thermistor R5 in temperature detecting module 120, detect in real time the temperature of motor, at motor temperature during lower than the first temperature threshold, thermistor R5 dividing potential drop is less, the input voltage of the in-phase input end of comparator C O is higher than the reference voltage of inverting input, comparator C O output high level is controlled and is opened heating module 110, motor is heated, when by motor heating during to the second temperature threshold, comparator C O output low level is controlled and is closed heating module 110, after being completed, the heating of motor gets final product starter motor, winding with complete paired cable.By above-mentioned cable low-temperature test control circuit, can make the Low-Temperature Reliability test of cable complete in high-low temperature chamber, avoided the impact of ambient temperature on test result, test data is more accurate.
As shown in Figure 1, in specific embodiment, cable low-temperature test control circuit also comprises counting module 150.Counting module 150 has the first control module 152 and the second control module 154.
The first control module 152, for generating count enable signal, and counts according to this technology enabling signal.Conventionally, the every rotation of motor one week, counting module 150 is once counted, and by the first control module 152, can know all numbers that electric machine main shaft rotates, and then monitoring motor is wound around all numbers of cable.
The second control module 154, cuts off motor main circuit for after reaching pre-set count values at counting.Send warning simultaneously.By counting module 150, pre-set count values can be set, when the counting of counting module 150 reaches pre-set count values, the second control module 154 meeting automatic cut-off motor main circuits also send warning.By the second control module 154, all numbers that can control cables be wound around.
In the present embodiment, the first control module 152 comprises tongue tube K5, the 4th relay K 4, the 4th transistor Q4, the 5th filter capacitor C5 and the second pull down resistor R8.The 4th transistor Q4 comprises input end, output terminal and control conducting or turn-offs the control end of the 4th transistor Q4.One end of tongue tube K5 is connected with the output terminal of AC-DC conversion module 140, the control end of another termination the 4th transistor Q4 of tongue tube K5 and one end of the 5th filter capacitor C5, the other end ground connection of the 5th filter capacitor C5, the 5th filter capacitor C5 plays filtering and eliminates peak voltage.Conventionally, tongue tube K5 is arranged at a side of electric machine main shaft, on the main shaft of motor, magnet is installed, when electric machine main shaft band moving magnet turns to a side of close tongue tube K5, tongue tube K5 conducting, when electric machine main shaft band moving magnet is during away from tongue tube K5, tongue tube K5 disconnects.The every rotation of electric machine main shaft one week, the every conducting of tongue tube K5 once.Therefore, by the conducting number of times of supervision tongue tube K5, can know all numbers of cable winding.One end of the 4th transistor Q4 input termination the 4th relay K 4 coils, the other end of the 4th relay K 4 coils is connected with the output terminal of AC-DC conversion module 140.The 4th transistor Q4 output head grounding.The 4th transistor Q4 is field effect transistor.When tongue tube K5 conducting, the control end of the 4th transistor Q4 obtains electric, controls conducting the 4th transistor Q4 conducting, the coil of the 4th relay K 4 obtains electric, the normally opened contact of the 4th relay K 4 is closed, and the first control module 152 generates count enable signal, and once counts.Tongue tube K5 disconnects subsequently, the coil losing electricity of the 4th relay K 4, and the normally opened contact of the 4th relay K 4 disconnects, and once counting finishes.The second pull down resistor R8 is connected in parallel in the two ends of the 5th filter capacitor C5, plays a part drop-down.
In the present embodiment, the second control module 152 comprises the 3rd relay K 3, counting contact (not indicating), alarm actuating contact (not indicating) and hummer P.Counting one end, contact is connected with the output terminal of AC-DC conversion module 140, one end of another termination the 3rd relay K 3 coils, the other end ground connection of the 3rd relay K 3 coils.The normally opened contact access motor main circuit of the 3rd relay K 3.One end of alarm actuating contact is connected with the output terminal of AC-DC conversion module 140, and the other end is connected with hummer P.By counting module 150, pre-set count values can be set, when counting does not reach counting preset value, the counting closing of contact, alarm actuating contact disconnects.Now, the 3rd relay K 3 coils obtain electric, the normally opened contact of the 3rd relay K 3 of access motor main circuit is in closure state, motor runs well, counting module 150 is in counting standby condition, when electric machine main shaft goes to magnet near tongue tube K5, tongue tube K5 conducting, the 4th transistor Q4 conducting, the 4th relay K 4 coils obtain electric, and the normally opened contact of the 4th relay K 4 is closed, counting module 150 is once counted, tongue tube K5 disconnects subsequently, and the normally opened contact of the 4th relay K 4 disconnects, and once counting finishes.When all numbers of electric machine main shaft rotation make the count value of counting module 150 reach pre-set count values, counting contact disconnects, the 3rd relay K 3 coil losing electricities, and the normally opened contact of the 3rd relay K 3 in motor main circuit disconnects, motor main circuit is cut off, and motor quits work.Meanwhile, alarm actuating contact is closed, and hummer P obtains electric alarm, to notify laboratory technician to complete the winding of cable.
As described in Figure 1, in specific embodiment, heating module 110 also comprises the 4th filter capacitor C4.One end of the 4th filter capacitor C4 is connected with the 3rd control end, the other end ground connection of the 4th filter capacitor C4.The 3rd transistor Q3 is field effect transistor.The 4th filter capacitor C4 plays filtering and eliminates peak voltage.When the temperature of motor is during lower than the first temperature threshold, temperature detecting module 120 output high level (or low level), the control end of the 3rd transistor Q3 receives this high level, make the 3rd transistor Q3 conducting, the coil of the first relay K 1 obtains electric, the normally opened contact of the first relay K 1 is closed, and heating resistor R7 obtains electric, starts motor to heat.When motor temperature heats the second temperature threshold, temperature detecting module 120 output low levels, the control end of the 3rd transistor Q3 receives this low level, the 3rd transistor Q3 is turn-offed, the coil losing electricity of the first relay K 1, the normally opened contact of the first relay K 1 disconnects, and heating resistor R7 dead electricity stops heating.
As shown in Figure 1, in specific embodiment, temperature detecting module 120 also comprises the first divider resistance R2, the second divider resistance R3 and the first pull down resistor R4.One end of the second divider resistance R3 is connected with the output terminal of AC-DC conversion module 140, one end of another termination the first divider resistance R2 of the second divider resistance R3 and the inverting input of comparator C O, the other end ground connection of the first divider resistance R2.Thermistor R5 is fixed on motor conventionally, can think temperature and the motor temperature realtime uniform of thermistor R5.When motor temperature is lower, the temperature of thermistor R5 is lower, and resistance value is less, and when lower than the first temperature threshold, the terminal voltage of the in-phase input end of comparator C O is greater than the terminal voltage of inverting input, and comparator C O exports high level.Heating module 110 starts to motor heating, and the resistance value of thermistor R5 increases gradually, and when motor temperature reaches the second temperature threshold, the terminal voltage of the in-phase input end of comparator C O is less than the terminal voltage of inverting input, comparator C O output low level.Heating module 110 stops motor heating.
As shown in Figure 1, in specific embodiment, indicating module 130 comprises phase inverter I, the 3rd filter capacitor C3, transistor seconds Q2, the second relay K 2, light emitting diode D and current-limiting resistance R6.Transistor seconds comprises input end, output terminal and controls conducting or the control end of shutoff transistor seconds Q2.One end of the coil of the second relay K 2 is connected with the output terminal of AC-DC conversion module 140, the input end of another termination transistor seconds Q2 and one end of the second normally opened contact of the second relay K 2 and the negative pole of light emitting diode D, the output head grounding of transistor seconds Q2, the positive pole of light emitting diode D is connected with the output terminal of AC-DC conversion module 140.One end of another termination current-limiting resistance R6 of the second relay K 2 second normally opened contacts, the other end ground connection of current-limiting resistance R6.The control end of transistor seconds Q2 connects one end of the 3rd filter capacitor C3 and the output terminal of phase inverter I, the other end ground connection of the 3rd filter capacitor C3.The output terminal of the input termination comparator C O of phase inverter I.The first normally opened contact access motor main circuit of the second relay K 2.Indicating module 130 receives the low level of temperature detecting module 120 outputs, the second crystal Q2 pipe conducting, the second relay K 2 coils obtain electric, the first normally opened contact of the second relay K 2 and the second normally opened contact are closed, the second relay K 2 self-lockings, the first normally opened contact of the second relay K 2 continues conducting, and light emitting diode continues luminous, and indication laboratory technician can starter motor.Conventionally, transistor seconds Q2 adopts field effect transistor.Easily understand, transistor seconds Q2 can also adopt bipolar transistor.
As shown in Figure 1, in specific embodiment, AC-DC conversion module 140 comprises transformer T1, bridge heap B1, three-terminal voltage-stabilizing pipe Q1, the first filter capacitor C1 and the second filter capacitor C2.Three-terminal voltage-stabilizing pipe Q1 comprises input end, output terminal and earth terminal.The input end input AC electricity of transformer T1, the input end of output termination bridge heap B1.The cathode output end of bridge heap B1 connects one end of input end and the first filter capacitor C1 of three-terminal voltage-stabilizing pipe Q1, cathode output end ground connection.The other end ground connection of the first filter capacitor C1, direct current is also exported in one end of output termination the second filter capacitor C2 of three-terminal voltage-stabilizing pipe Q1.The other end ground connection of the second filter capacitor C2.The earth terminal ground connection of three-terminal voltage-stabilizing pipe Q1.The first filter capacitor C1 and the second filter capacitor C2 strobe.The alternating current of AC power output is after transformer T1 step-down, through bridge heap B1, process again, export the first direct current, the first direct current is inputted the input end of three-terminal voltage-stabilizing pipe Q1 after the filtering of the first filter capacitor C1, the earth terminal ground connection of three-terminal voltage-stabilizing pipe Q1, so that reference voltage to be provided, the output terminal of three-terminal voltage-stabilizing pipe Q1 output direct current, the direct current of output is that heating module 110, temperature detecting module 120 and indicating module 130 are powered after the second filter capacitor C2 filtering.
In concrete circuit, motor is by motor main circuit incoming transport power supply, and motor main circuit is comprised of the first interrupteur SW 1 being connected in series, second switch SW2, the first normally opened contact of the second relay K 2 and the normally opened contact of the 3rd relay K 3.When all numbers of the rotation to electric machine main shaft are counted, conventionally adopt TCN-P61B counter to count, the power input of this relay is connected with motor main circuit, between " 12V " of counter and " INPUT " pin, access the normally opened contact of the 4th relay K 4, " COM " pin is connected with the DC output end of AC-DC conversion module 140, " NG " pin connects the coil of the 3rd relay K 3, and " NO " pin connects hummer.After counter pre-set count values, " NG " pin is connected, and the coil of the 3rd relay K 3 obtains electric, and the normally opened contact of the 3rd relay K 3 is closed.Closed the first interrupteur SW 1, AC-DC conversion module 140 is converted to direct current by alternating current, so that heating module 110, temperature detecting module 120 and indicating module 130 are powered.Motor is placed in high-low temperature chamber, start high-low temperature chamber, when the temperature of motor is during lower than the first temperature threshold, the resistance of thermistor R5 is less, the voltage of the in-phase input end of comparator C O is higher than the voltage of inverting input, and the output terminal of comparator C O output high level, controls conducting the 3rd transistor Q3, the first relay K 1 action, heating resistor R7 starts motor to heat.Meanwhile, high level converts low level to after phase inverter I processes, to keep transistor seconds Q2 to close.
In motor heating process, the temperature of thermistor R5 raises gradually, resistance increases gradually, when the temperature of motor is heated to the second temperature threshold, the voltage of the in-phase input end of comparator C O is lower than the voltage of inverting input, and the output terminal output low level of comparator C O, controls and close the 3rd transistor Q3, the first relay K 1 dead electricity, heating resistor R7 stops motor heating.Simultaneously, low level converts high level to after phase inverter I processes, to control conducting transistor seconds Q2, the coil of the second relay K 2 obtains electric, the first normally opened contact of the second relay K 2 and the second normally opened contact are closed, the second normally opened contact makes the second relay self-locking, and the first normally opened contact and the second normally opened contact are in continuing closure state.Meanwhile, light emitting diode D lights, laboratory technician's closed second switch SW2, and motor starts to rotate.When the main shaft of motor goes to magnet when through tongue tube K5, tongue tube K5 conducting, the 4th transistor Q4 conducting, the coil of the 4th relay K 4 obtains electric, the normally opened contact of the 4th relay K 4 is closed, rolling counters forward once, after a while, rotation along with motor, magnet is away from tongue tube K5, and tongue tube K5 disconnects, the 4th relay K 4 coil losing electricities, the normally opened contact of the 4th relay K 4 disconnects, and once counting finishes.When all numbers of electric machine main shaft rotation make the count value of counter reach pre-set count values, " NG " pin disconnects, the 3rd relay K 3 coil losing electricities, and the normally opened contact of the 3rd relay K 3 in motor main circuit disconnects, motor main circuit is cut off, and motor quits work.Meanwhile, the conducting of " NO " pin, hummer P obtains electric alarm, to notify laboratory technician to complete the winding of cable.
Motor is placed in high-low temperature chamber, and cable to be wound is connected with electric machine main shaft, controls motor and rotates at low temperatures, thereby cable is wound around, with the test of complete paired cable by above-mentioned cable low-temperature test control circuit.After the winding of the complete paired cable of motor, cable low-temperature test control circuit is controlled and is cut off motor main circuit, and sends warning, notifies laboratory technician to test.Whole test process need not be opened the chamber door of high-low temperature chamber completely, also without staff, tests at low temperatures, meets testing requirement, has improved measuring accuracy and has reduced laboratory technician's fatigue strength, has improved testing efficiency.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a cable low-temperature test control circuit, is characterized in that, comprising:
AC-DC conversion module, changes and exports direct current by the alternating current of input;
Temperature detecting module, comprise the thermistor, adjustable resistance and the comparer that are arranged at motor, one end of described thermistor is connected with the output terminal of described AC-DC conversion module, another termination adjustable resistance of described thermistor and the normal phase input end of comparer, the other end ground connection of described adjustable resistance; The anti-phase input termination reference voltage of described comparer, output terminal output high level or low level;
Heating module, comprise heating resistor, the first relay and the 3rd transistor for adding thermoelectric perpetual motion machine, one end of the coil of described the first relay is connected with the output terminal of described AC-DC conversion module, the 3rd transistorized input end described in another termination of described the first relay, described the 3rd transistorized output head grounding; The output terminal of comparer described in described the 3rd transistorized control termination, one end of the normally opened contact of described the first relay is connected with the output terminal of described AC-DC conversion module, one end of heating resistor described in another termination of the normally opened contact of described the first relay, the other end ground connection of described heating resistor.
2. cable low-temperature test control circuit according to claim 1, it is characterized in that, also comprise counting module, described counting module comprises the first control module and the second control module, described the first control module comprises tongue tube, the 4th relay and the 4th transistor, and described the 4th transistor comprises input end, output terminal and controls conducting or turn-off described the 4th transistorized control end; One end of described tongue tube is connected with the output terminal of described AC-DC conversion module, the 4th transistorized control end described in another termination of described tongue tube, one end of the 4th relay coil described in described the 4th transistorized input termination, the other end of described the 4th relay coil is connected with the output terminal of described AC-DC conversion module; Described the 4th transistorized output head grounding, when the normally opened contact of described the 4th relay is closed, described the first control module generates count enable signal, and controls described counting module and once count; Described the second control module comprises the 3rd relay, counting contact, alarm actuating contact and hummer, one end, described counting contact is connected with the output terminal of described AC-DC conversion module, one end of the 3rd relay coil described in another termination of described counting contact, the other end ground connection of described the 3rd relay coil, the normally opened contact access motor main circuit of described the 3rd relay; One end of described alarm actuating contact is connected with the output terminal of described AC-DC conversion module, and the other end of described alarm actuating contact is connected with described hummer; When counting does not reach counting preset value, the described counting closing of contact, described alarm actuating contact disconnects, otherwise described counting contact disconnects, and described alarm actuating contact is closed.
3. cable low-temperature test control circuit according to claim 2, it is characterized in that, described the first control module also comprises the 5th filter capacitor and the second pull down resistor, one end of described the 5th filter capacitor is connected in described the 4th transistorized control end, the other end ground connection of described the 5th filter capacitor, described the second pull down resistor is connected in parallel in the two ends of described the 5th filter capacitor.
4. cable low-temperature test control circuit according to claim 2, is characterized in that, described the 3rd transistor AND gate the 4th transistor is field effect transistor.
5. cable low-temperature test control circuit according to claim 1, it is characterized in that, described heating module also comprises the 4th filter capacitor, and one end of described the 4th filter capacitor is connected with described the 3rd transistorized control end, the other end ground connection of described the 4th filter capacitor.
6. cable low-temperature test control circuit according to claim 1, it is characterized in that, described temperature detecting module also comprises the first divider resistance, the second divider resistance and the first pull down resistor, one end of described the second divider resistance is connected with the output terminal of described AC-DC conversion module, one end of the first divider resistance and the inverting input of described comparer described in another termination of described the second divider resistance, the other end ground connection of described the first divider resistance.
7. cable low-temperature test control circuit according to claim 1, it is characterized in that, described AC-DC conversion module comprises transformer, Qiao Dui, three-terminal voltage-stabilizing pipe, the first filter capacitor and the second filter capacitor, described three-terminal voltage-stabilizing pipe comprises input end, output terminal and earth terminal, the input end input AC electricity of described transformer, the input end of bridge heap described in output termination; The cathode output end of described bridge heap connects one end of input end and first filter capacitor of described three-terminal voltage-stabilizing pipe, cathode output end ground connection; The other end ground connection of described the first filter capacitor, one end of the second filter capacitor export direct current, the other end ground connection of described the second filter capacitor described in the output termination of described three-terminal voltage-stabilizing pipe; The earth terminal ground connection of described three-terminal voltage-stabilizing pipe.
8. control circuit according to claim 1, it is characterized in that, also comprise indicating module, described indicating module comprises transistor seconds, phase inverter and light emitting diode, and described transistor seconds comprises input end, output terminal and controls conducting or turn-off the control end of described transistor seconds; The positive pole of described light emitting diode connects the output terminal of described AC-DC conversion module, negative pole connects the input end of described transistor seconds, the output terminal of phase inverter described in the control termination of described transistor seconds, the output terminal of comparer described in the input termination of described phase inverter, the output head grounding of described transistor seconds.
9. cable low-temperature test control circuit according to claim 8, it is characterized in that, described indicating module also comprises the second relay, the 3rd filter capacitor and current-limiting resistance, one end of the coil of described the second relay is connected with the output terminal of AC-DC conversion module, the input end of transistor seconds described in another termination of the coil of described the second relay; The first normally opened contact access motor main circuit of described the second relay, the negative pole of light emitting diode described in one termination of the second normally opened contact of described the second relay, one end of current-limiting resistance described in another termination of the second normally opened contact of described the second relay, the other end ground connection of described current-limiting resistance; The control end of transistor seconds described in one termination of described the 3rd filter capacitor, the other end ground connection of described the 3rd filter capacitor.
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| CN201210274397.4A CN103576017B (en) | 2012-08-01 | 2012-08-01 | Cable low-temperature test control circuit |
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| CN201210274397.4A CN103576017B (en) | 2012-08-01 | 2012-08-01 | Cable low-temperature test control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105183035A (en) * | 2015-08-10 | 2015-12-23 | 芜湖瑞泰精密机械有限公司 | Industrial temperature acquisition control circuit |
| CN106501638A (en) * | 2016-10-11 | 2017-03-15 | 深圳市速普瑞科技有限公司 | A kind of low temperature environment intelligent measuring instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105183035A (en) * | 2015-08-10 | 2015-12-23 | 芜湖瑞泰精密机械有限公司 | Industrial temperature acquisition control circuit |
| CN108885473A (en) * | 2016-03-30 | 2018-11-23 | 深圳市大疆创新科技有限公司 | For controlling the method and system of motor |
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| CN110672968A (en) * | 2019-11-05 | 2020-01-10 | 国网黑龙江省电力有限公司电力科学研究院 | Test system for secondary equipment detection in cold area |
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|---|---|
| CN103576017B (en) | 2018-02-06 |
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