CN115514257B - Slow start circuit for electric winch - Google Patents
Slow start circuit for electric winch Download PDFInfo
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- CN115514257B CN115514257B CN202211322643.9A CN202211322643A CN115514257B CN 115514257 B CN115514257 B CN 115514257B CN 202211322643 A CN202211322643 A CN 202211322643A CN 115514257 B CN115514257 B CN 115514257B
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- 238000002955 isolation Methods 0.000 claims abstract description 11
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/022—Security devices, e.g. correct phase sequencing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/02—Driving gear
- B66D1/12—Driving gear incorporating electric motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
- B66D1/40—Control devices
- B66D1/48—Control devices automatic
- B66D1/485—Control devices automatic electrical
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual dc motor
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- Power Engineering (AREA)
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- Computer Security & Cryptography (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The invention provides a slow start circuit for an electric winch. The sawtooth wave generating circuit is used for receiving the power-on signal and outputting a sawtooth wave which is converted periodically; the PWM wave generating circuit is connected with the sawtooth wave generating circuit and converts the sawtooth wave into PWM square wave; the photoelectric isolation circuit is connected with the PWM wave generation circuit and converts the PWM square wave into a driving square wave; and the motor driving circuit is connected with the photoelectric isolation circuit and receives the driving square wave, and the motor driving circuit is conducted.
Description
Technical Field
The invention belongs to the technical field of motor control, and particularly relates to a slow start circuit for an electric winch.
Background
The winch consists of a rotatable winding drum, a transmission device, a brake and a power part, and is widely applied to places with heavy work and larger required traction force. With the development of motor control technology, the electric winch receives extensive attention due to the advantages of high control precision, visual control logic, small environmental pollution and the like.
The motor is used as a power source of the electric winch system and is a core component of the winch system. The DC brush motor is a DC motor, the stator of which is provided with a fixed main magnetic pole and an electric brush, and the rotor is provided with an armature winding and a commutator. The electric energy of the direct current power supply enters the armature winding through the electric brush and the commutator to generate armature current, and the magnetic field generated by the armature current interacts with the main magnetic field to generate electromagnetic torque, so that the motor rotates to drive a load. The direct current brush motor has the characteristics of good response speed, good braking effect, simple control mode and low economic cost. Winch emergency motors typically use a dc brush motor.
Generally, the winch motor adopts a direct-current application mode, and the direct-current motor is directly powered on two ends of the motor in the direct-current application mode, so that the motor instantly reaches the rated rotation speed. The mode has no slow start logic, the motor start moment can cause larger impact current of an electrified system, the system electricity safety is not facilitated, and meanwhile, the instant high-rotation-speed start can also cause larger moment impact on a mechanical system, and the service life of the mechanical system is influenced. The other part is provided with a slow start control mode, and the duty ratio of the output PWM wave is controlled by a CPU to be gradually increased so as to achieve the aim of slow start of the motor. The design mode has the defects that the control system is complex, the cost is high, and the slow start effect cannot be realized once the CPU fails depending on the control instruction of the CPU; and the time of slow start is single, once the time is not adjustable after setting, can exist in the practical application of winch system and draw the big condition of object weight difference, easily cause great impact to the hawser is repeated, shortens the life of hawser, increases the risk that the hawser destroyed, is unfavorable for winch system's normal work and operation.
Disclosure of Invention
The invention provides a slow starting circuit for an electric winch based on a Schmitt trigger, which has the function of adjusting the slow starting rate according to the detected tension feedback. The main purpose is that can be more high-efficient, the reliable control motor slow start to reduce the impact that causes the winch hawser, extension hawser life improves system work efficiency and life.
The invention provides a slow start circuit for an electric winch, which comprises:
the sawtooth wave generating circuit is used for receiving the power-on signal and outputting a sawtooth wave which is converted periodically;
the PWM wave generating circuit is connected with the sawtooth wave generating circuit and converts the sawtooth wave into PWM square wave;
the photoelectric isolation circuit is connected with the PWM wave generation circuit and converts the PWM square wave into a driving square wave;
and the motor driving circuit is connected with the photoelectric isolation circuit and receives the driving square wave, and the motor driving circuit is conducted.
Further: the sawtooth wave generating circuit consists of a Schmidt trigger, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a first resistor, a second resistor and a first triode; wherein,
the voltage end of the Schmidt trigger is electrically connected with one end of the second capacitor and the power supply end, the other end of the second capacitor is grounded, and the other end of the first capacitor is connected with the grounding end;
the common end of the Schmitt trigger is connected with a first capacitor and a first resistor which are connected in series, and a grounding end of the Schmitt trigger is connected between the first capacitor and the first resistor;
the base electrode of the first triode is electrically connected with the first resistor;
the first diode and the second diode are connected in series, the cathode of the second diode is connected with the base electrode of the first triode, and the anode of the first diode is connected with the reset end of the Schmitt trigger and one end of the second resistor R2;
the emitter of the first triode is electrically connected with the other end of the second resistor;
the collector of the first triode is connected with the grounding end through a third capacitor.
Further: the PWM wave generating circuit comprises a first comparator, a fourth capacitor, a fifth capacitor, a third resistor, a fourth resistor, a fifth resistor and a tension feedback circuit; wherein,
the positive electrode port of the first comparator is electrically connected with one end of a third resistor, and the other end of the third resistor is electrically connected with the DIS port of the Schmidt trigger, the collector electrode of the first triode Q1 and one end of a third capacitor C3;
the negative electrode port of the first comparator is connected between the fourth resistor and the fourth capacitor;
the other end of the fourth capacitor is connected with a reference voltage, and the other end of the fourth resistor is connected with a grounding end;
a fifth resistor is connected between the output port of the first comparator and the power supply port;
the power supply port of the first comparator is also connected with a fifth capacitor, one end of the fifth capacitor is connected with a grounding end, and the other end of the fifth capacitor is connected with a fifth resistor, a sixth capacitor, an eighth resistor and a ninth resistor; the ground voltage port of the first comparator is connected with the ground terminal;
and a tension feedback circuit is connected between the negative electrode port of the first comparator and the fourth resistor.
Further: the tension feedback circuit is composed of a second comparator, a third comparator, a fourth comparator, a fifth comparator, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor R24, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube and a seventh MOS tube; wherein,
a twenty-first resistor and a sixteenth resistor which are connected in series are connected between the positive input end and the output end of the second comparator, the output end of the second comparator is also connected with the grid electrode of the fourth MOS tube, and a +5V power supply port is connected between the twentieth resistor and the sixteenth resistor;
the twenty-first resistor, the twenty-second resistor, the twenty-third resistor and the twenty-fourth resistor are connected in series, and the other end of the twenty-fourth resistor is connected with the grounding end;
the positive electrode input end of the third comparator is connected between the twenty-first resistor and the twenty-second resistor, the output end of the third comparator is connected with one end of the seventeenth resistor and the grid electrode of the fifth MOS tube, and the other end of the seventeenth resistor is connected with a +5V power supply port;
the positive electrode input end of the fourth comparator is connected between the twenty-second resistor and the twenty-third resistor, an eighteenth resistor is connected between the output end of the fourth comparator and the power supply end, the output end of the fourth comparator is also connected with the grid electrode of the sixth MOS tube, and a power supply port is arranged between the power supply end of the fourth comparator and the eighteenth resistor;
the positive electrode input end of the fifth comparator is connected between the twenty-third resistor and the twenty-fourth resistor, the output end of the fifth comparator is connected with the nineteenth resistor and the grid electrode of the seventh MOS tube, and the other end of the nineteenth resistor is connected with a +5V power supply port;
the drain electrode of the fourth MOS tube is connected with a twelfth resistor, and the other end of the twelfth resistor is connected with the other end of the thirteenth resistor and the negative electrode port of the first comparator; the drain electrode of the fifth MOS tube is connected with a thirteenth resistor, and the other end of the thirteenth resistor is also connected with the other end of the fourteenth resistor; the drain electrode of the sixth MOS tube is connected with a fourteenth resistor, and the other end of the fourteenth resistor is also connected with the other end of the fifteenth resistor; the drain electrode of the seventh MOS tube is connected with a fifteenth resistor, and the other end of the fifteenth resistor is connected between the fourth resistor and the fourth capacitor;
the source electrode of the fourth MOS tube, the source electrode of the fifth MOS tube, the source electrode of the sixth MOS tube and the source electrode of the seventh MOS tube are connected between the fourth resistor and the grounding end.
Further:
the photoelectric isolation circuit consists of a photoelectric coupler, a second MOS tube, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a sixth capacitor, a seventh capacitor and an eighth capacitor; wherein,
the first input end of the photoelectric coupler is connected with an eighth resistor and a sixth capacitor which are connected in series, and the other end of the sixth capacitor is connected with a grounding end;
the second input end of the photoelectric coupler is connected with one end of a ninth resistor and the drain electrode of the second MOS tube, and the other end of the ninth resistor is connected between the eighth resistor and the sixth capacitor;
a seventh capacitor and a seventh resistor which are connected in parallel are connected between the grid electrode and the source electrode of the second MOS tube, a sixth resistor is also connected between the grid electrode of the second MOS tube and the first comparator, and a grounding end is arranged between the seventh capacitor and the seventh resistor;
the first output end of the photoelectric coupler is connected with the grounding end and the power port through an eighth capacitor;
further: the motor driving circuit consists of a third MOS tube, a tenth resistor, an eleventh resistor and a ninth capacitor; wherein,
the grid electrode of the third MOS tube is electrically connected with the second output end of the photoelectric coupler through a tenth resistor;
an eleventh resistor and a ninth capacitor which are connected in parallel are connected between the grid electrode and the source electrode of the third MOS tube, one end of the ninth capacitor, which is connected with the source electrode of the third MOS tube, is also connected with a grounding end, one end of the ninth capacitor, which is connected with the source electrode of the third MOS tube, and one end of the eleventh resistor, which is connected with the ninth capacitor, is also connected with a driving end, and the drain electrode of the third MOS tube is connected with the driving end.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a schematic circuit diagram of a slow start circuit for an electric winch according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The slow start circuit mainly comprises a sawtooth wave generating circuit, a PWM wave generating circuit, a photoelectric isolation circuit and a motor driving circuit.
The sawtooth wave generating circuit consists of a Schmitt trigger U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2 and a first triode Q1. The partial circuit mainly has the function of outputting periodic converted sawtooth waves. The working principle is as follows: when the system is powered on initially, the third capacitor C3 is not charged, the pins 2, 6 and 7 are low level, the DIS port of the Schmidt trigger is a discharging pin for providing a charging or discharging loop for the capacitor C3, the internal trigger outputs low level, the chip outputs high level, and the system enters a temporary steady state. After the internal trigger outputs a low level, the 7 pins are not grounded any more, at this time, the third capacitor C3 starts to charge through the second resistor R2, the voltage at the left end of the third resistor R3 is the charging voltage of the third capacitor C3, which is a dynamic increasing process, until the voltage on the third capacitor C3 reaches (2/3) VCC, the internal trigger is reset, at this time, the 7 pins are grounded, the third capacitor C3 forms a discharging loop through the 7 pins, the voltage at the left end of the third resistor R3 is at a low level of 0V, and the state returns to the initial state, which is a steady state. The time for maintaining the transient state is the time for charging the third capacitor C3, and depends on the parameters of the third capacitor C3 and the second resistor R2. The voltage at the left end of the third resistor R3 repeats the process of increasing from 0V to 3.3V. The output voltage waveform of the circuit is a sawtooth wave with fixed period.
The PWM wave generating circuit is composed of a first comparator U2, a fourth capacitor C4, a fifth capacitor C5, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a tension feedback circuit. At the beginning of power-on, the fourth capacitor C4 is equivalent to a short circuit, the fourth resistor R4 is approximately connected between the 5V voltage and the power ground, the 2-pin level of the first comparator U2 is high, the voltage on both sides of the fourth resistor R4 gradually decreases to zero along with the charging of the capacitor, the 2-pin level of the first comparator U2 is slowly reduced from 5V to 0V, and the reduction speed is determined by the capacitance value of the fourth capacitor C4 and the resistance value of the fourth resistor R4. The voltage waveform is a curve with a slope that slowly decreases relative to a fixed voltage amplitude. The waveform is used as the negative electrode input of the comparator, the output voltage waveform of the sawtooth wave generating circuit is used as the positive electrode input of the comparator, and according to the principle of the comparator, when the positive electrode input is larger than the negative electrode input, the comparator outputs high level 5V, and otherwise outputs low level 0V. Thus, the comparator outputs a PWM square wave with a fixed period and a gradually increasing duty cycle (minimum duty cycle 0.33. Maximum duty cycle 1).
The time when the level of the 2 pin of the first comparator U2 is reduced from 5V to 0V is the time of the motor slow start, and the level reduction rate of the time influences the performance of the motor slow start. The level is slow to reduce, the PWM duty cycle is slow to increase, and the motor is slower to start. If the level reduction speed is high, the PWM duty ratio increases speed, and the motor starts correspondingly fast. When the winch lifts the article with larger weight, if the article acceleration is increased to reach the rated rotation speed, the rope is required to provide larger pulling force, the long-life use of the winch system is not facilitated, when the winch lifts the article with smaller weight, if the motor reaches the rated rotation speed too slowly, the task completion efficiency is reduced, and the system response time is prolonged. Therefore, a tension sensor is used for introducing cable tension feedback, and the slow start time is regulated by feeding back the numerical value through the tension sensor. The problem of long-life use of the mooring rope can be effectively solved, and the response time of the system can be ensured.
The tension feedback circuit consists of a second comparator U4A, a third comparator U4B, a fourth comparator U5A, a fifth comparator U5B, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a fourth MOS tube Q4, a fifth MOS tube Q5, a sixth MOS tube Q6 and a seventh MOS tube Q7. The tension sensor outputs different voltage values according to the tension, the output voltage ranges from 0V to 5V, and the voltage is used as the negative electrode input of the second comparator U4A, the third comparator U4B, the fourth comparator U5A and the fifth comparator U5B. According to the invention, five different pulling force ranges are set, and the reference voltages of 1V, 2V, 3V and 4V are respectively used as the positive electrode input of each comparator, so that real-time pulling force data fed back by the pulling force sensor is converted into different comparator output quantities, and the conduction quantity of the charging resistor is controlled. The specific principle is that when the positive electrode input of the comparator is larger than the negative electrode input, the comparator outputs high level 5V, otherwise outputs low level 0V, and the larger the voltage output by the tension sensor is, the smaller the number of the high levels output by the comparator is. The output of the comparator is connected with the G electrode (grid electrode) of the MOS tube, the S electrode (source electrode) of the MOS tube is grounded, and when the G electrode voltage is smaller than the S electrode voltage according to the principle of the MOS tube, the MOS tube is not conducted, and the break is equivalent between the D electrode (drain electrode) and the S electrode; when the G pole voltage is greater than the S pole voltage, the D pole and the S pole are conducted, which is similar to a conducting wire. The charging resistance of the C4 can be controlled by controlling the conduction of different MOS tubes, so that the slow start rate is controlled.
For example, when a winch lifts a heavy article, the feedback voltage of the tension sensor is supposed to be in a 4-5V interval, which means that the tension value is large at the moment, so that the four-way comparator circuit outputs low level, only R4 is connected into the charging circuit, the equivalent charging resistance is maximum, the slow starting time is longest, and the winch cable is protected from overstress operation. When the winch system lifts normal weight articles, the feedback voltage of the tension sensor is assumed to be in a 2-3V interval, the tension value is normal at the moment, the second comparator U4A and the third comparator U4B output high levels, the fourth comparator U5A and the fifth comparator U5B output low levels, the twelfth resistor R12 and the thirteenth resistor R13 are connected with the charging circuit, the equivalent resistance value is reduced, and the slow starting time is shortened. The second comparator U4A and the fourth comparator U5A have input ports for INA+ and INA-; the third comparator U4B and the fifth comparator U5B have input ports for INB+ and INB-.
When the winch system lifts lighter weight articles, the feedback voltage of the tension sensor is assumed to be in a 0-1V interval, the tension value is smaller at the moment, the second comparator U4A, the third comparator U4B, the fourth comparator U5A and the fifth comparator U5B all output high levels, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14 and the fifteenth resistor R15 are connected into a charging circuit, the resistance value of the equivalent resistor is minimum, the slow start time is shortest, and the rotating speed of the winch can be accelerated to a rated speed at the highest speed.
The detection values of the tension sensors of different gears can be set according to different winch systems, so that the winch is slowly started to have corresponding gear control modes.
The photoelectric coupler of the photoelectric isolation circuit comprises a photoelectric coupler U3, a second MOS tube Q2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8. The working principle is that when the front end input of the sixth resistor R6 is at a low level, the second MOS tube Q2 is not conducted, no current flows through the source side of the photoelectric coupler U3, the optical coupler is not conducted, when the front end input of the sixth resistor R6 is at a high level, the second MOS tube Q2 is conducted, the source side 2 of the photoelectric coupler U3 is grounded, the optical coupler generates conducting current, and the secondary side of the optical coupler is conducted. The photoelectric isolation circuit is used for isolating PWM waves generated by the front-stage circuit and converting the PWM waves into 15V PWM waves with driving capability.
The motor driving circuit is composed of a third MOS tube Q3, a tenth resistor R10, an eleventh resistor R11 and a ninth capacitor C9. When the secondary side of the optocoupler is conducted, the 15V level driving MOS tube is conducted, the motor is connected with the driving voltage, when the secondary side of the optocoupler is not conducted, the driving voltage of the MOS tube is 0V, and the motor is not connected with the driving voltage.
Under the control action of the slow start circuit, the direct current brush motor receives a driving signal with an initial value of 0.33 and a slowly increased duty ratio, and the rotating speed of the motor is equivalent to the product of the rated rotating speed and the duty ratio, so that the rotating speed of the motor slowly increases until reaching the rated rotating speed.
When different objects are extracted, the larger the mass of the objects is, the larger the initial tension on the cable is, the speed of increasing the duty ratio of PWM waves after passing through the feedback circuit is reduced, the acceleration of the object is reduced, the final tension on the cable after passing through the feedback circuit is smaller than the tension generated by the tension feedback circuit without being introduced, the condition that the cable is subjected to limit stress is reduced, and the service life of the cable is prolonged; when the mass of the object is smaller, the initial tension on the cable is smaller, the speed of increasing the duty ratio of PWM waves after passing through the feedback circuit is faster, the acceleration of the object is increased, the final tension on the cable after passing through the feedback circuit is larger than the tension generated by the tension feedback circuit, and the speed of lifting the object with small weight is increased.
The tension feedback circuit can adjust the tension of the cable in real time according to different conditions, can reduce the tension when the tension is overlarge, achieves the purposes of protecting the cable and prolonging the service life of the cable, and can increase the tension when the tension is overlarge, so that the speed and the efficiency of extracting articles are ensured to a certain extent.
The invention adopts a pure hardware mode based on the Schmitt trigger U1 to realize the slow start of the motor, reduces the impact on the motor, avoids damaging the motor, and simultaneously, the slow start time is changed by feeding back the tension of the cable through the tension sensor, the service life of the cable is prolonged, the slow start time is more reasonable, and the working efficiency of the system is improved; the mode of pure hardware does not need the participation of a CPU control chip, so that the response speed of the controller is obviously improved, the controller has independence, the controller is not dependent on CPU control instructions, the complexity of system control is reduced, the controller is not easy to be interfered by external environments such as electromagnetism and the like, the error rate is low, the reliability is high, the system composition is simple, and the cost is lower.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (1)
1. A slow start circuit for an electric winch, comprising:
the sawtooth wave generating circuit is used for receiving the power-on signal and outputting a sawtooth wave which is converted periodically;
the PWM wave generating circuit is connected with the sawtooth wave generating circuit and converts the sawtooth wave into PWM square wave;
the photoelectric isolation circuit is connected with the PWM wave generation circuit and converts the PWM square wave into a driving square wave;
the motor driving circuit is connected with the photoelectric isolation circuit and receives the driving square wave, and the motor driving circuit is conducted;
the sawtooth wave generating circuit consists of a Schmitt trigger (U1), a first capacitor (C1), a second capacitor (C2) and a third capacitor (C3), a first diode (D1), a second diode (D2), a first resistor (R1), a second resistor (R2) and a first triode (Q1); wherein,
the voltage end of the Schmitt trigger (U1) is electrically connected with one end of the second capacitor (C2) and the power supply end, and the other end of the second capacitor (C2) is grounded;
the common end of the Schmitt trigger (U1) is connected with a first capacitor (C1) and a first resistor (R1) which are connected in series, the grounding end of the Schmitt trigger (U1) is connected between the first capacitor (C1) and the first resistor (R1), and the other end of the first capacitor (C1) is connected with the grounding end;
the base electrode of the first triode (Q1) is electrically connected with the first resistor (R1);
the first diode (D1) and the second diode (D2) are connected in series, the negative electrode of the second diode (D2) is connected with the base electrode of the first triode (Q1), and the positive electrode of the first diode (D1) is connected with the reset end of the Schmitt trigger (U1) and one end of the second resistor (R2);
the emitter of the first triode (Q1) is electrically connected with the other end of the second resistor (R2);
the collector electrode of the first triode (Q1) is connected with the grounding end through a third capacitor (C3); the PWM wave generation circuit consists of a first comparator (U2), a fourth capacitor (C4), a fifth capacitor (C5), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and a tension feedback circuit; wherein,
the positive electrode port of the first comparator (U2) is electrically connected with one end of a third resistor (R3), and the other end of the third resistor (R3) is electrically connected with the DIS port of the Schmidt trigger (U1), the collector electrode of the first triode (Q1) and one end of a third capacitor (C3);
the negative electrode port of the first comparator (U2) is connected between the fourth resistor (R4) and the fourth capacitor (C4);
the other end of the fourth capacitor (C4) is connected with a reference voltage, and the other end of the fourth resistor (R4) is connected with a grounding end;
a fifth resistor (R5) is connected between the output port of the first comparator (U2) and the power supply port (VDD);
the power supply port (VDD) of the first comparator (U2) is also connected with a fifth capacitor (C5), one end of the fifth capacitor (C5) is connected with a grounding end, and the other end of the fifth capacitor (C5) is connected with a fifth resistor (R5), a sixth capacitor (C6), an eighth resistor (R8) and a ninth resistor (R9); the ground voltage port (VSS) of the first comparator (U2) is connected with the ground terminal;
a tension feedback circuit is connected between the negative electrode port of the first comparator (U2) and the fourth resistor (R4);
the photoelectric isolation circuit consists of a photoelectric coupler (U3), a second MOS tube (Q2), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a sixth capacitor (C6), a seventh capacitor (C7) and an eighth capacitor (C8); wherein,
the first input end of the photoelectric coupler (U3) is connected with an eighth resistor (R8) and a sixth capacitor (C6) which are connected in series, and the other end of the sixth capacitor (C6) is connected with a grounding end;
the second input end of the photoelectric coupler (U3) is connected with one end of a ninth resistor (R9) and the drain electrode of the second MOS tube (Q2), and the other end of the ninth resistor (R9) is connected between an eighth resistor (R8) and a sixth capacitor (C6);
a seventh capacitor (C7) and a seventh resistor (R7) which are connected in parallel are connected between the grid electrode and the source electrode of the second MOS tube (Q2), a sixth resistor (R6) is also connected between the grid electrode of the second MOS tube (Q2) and the first comparator (U2), and a grounding end is arranged between the seventh capacitor (C7) and the seventh resistor (R7);
the first output end of the photoelectric coupler (U3) is connected with one end of an eighth capacitor (C8) and a power port, and the other end of the eighth capacitor (C8) is connected with a grounding end;
the motor driving circuit consists of a third MOS tube (Q3), a tenth resistor (R10), an eleventh resistor (R11) and a ninth capacitor (C9); wherein,
the grid electrode of the third MOS tube (Q3) is electrically connected with the second output end of the photoelectric coupler (U3) through a tenth resistor (R10);
an eleventh resistor (R11) and a ninth capacitor (C9) which are connected in parallel are connected between the grid electrode and the source electrode of the third MOS tube (Q3), and one end of the ninth capacitor (C9) connected with the source electrode of the third MOS tube (Q3) is also connected with a grounding end; a first driving end (B1) is arranged between the ninth capacitor (C9) and the source electrode of the third MOS tube (Q3), and the first driving end (B1) is also connected with one end of an eleventh resistor (R11); the drain electrode of the third MOS tube (Q3) is connected with the second driving end (A1);
the tension feedback circuit consists of a second comparator (U4A), a third comparator (U4B), a fourth comparator (U5A), a fifth comparator (U5B), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), a sixteenth resistor (R16), a seventeenth resistor (R17), an eighteenth resistor (R18), a nineteenth resistor (R19), a twentieth resistor (R20), a twenty-first resistor (R21), a twenty-second resistor (R22), a twenty-third resistor (R23), a twenty-fourth resistor (R24), a fourth MOS tube (Q4), a fifth MOS tube (Q5), a sixth MOS tube (Q6) and a seventh MOS tube (Q7); wherein,
a twenty-first resistor (R20) and a sixteenth resistor (R16) which are connected in series are connected between the positive input end and the output end of the second comparator (U4A), the output end of the second comparator (U4A) is also connected with the grid electrode of the fourth MOS tube (Q4), and a +5V power supply port is connected between the twenty-first resistor (R20) and the sixteenth resistor (R16);
the twenty-first resistor (R20), the twenty-first resistor (R21), the twenty-second resistor (R22), the twenty-third resistor (R23) and the twenty-fourth resistor (R24) are connected in series, and the other end of the twenty-fourth resistor (R24) is connected with the ground terminal;
the positive electrode input end of the third comparator (U4B) is connected between a twenty-first resistor (R21) and a twenty-second resistor (R22), the output end of the third comparator (U4B) is connected with one end of a seventeenth resistor (R17) and the grid electrode of a fifth MOS tube (Q5), and the other end of the seventeenth resistor (R17) is connected with a +5V power supply port;
the positive electrode input end of the fourth comparator (U5A) is connected between a twenty-second resistor (R22) and a twenty-third resistor (R23), an eighteenth resistor (R18) is connected between the output end of the fourth comparator (U5A) and the power supply end, the output end of the fourth comparator (U5A) is also connected with the grid electrode of a sixth MOS tube (Q6), and a power supply port is arranged between the power supply end of the fourth comparator (U5A) and the eighteenth resistor (R18);
the positive electrode input end of the fifth comparator (U5B) is connected between a twenty-third resistor (R23) and a twenty-fourth resistor (R24), the output end of the fifth comparator (U5B) is connected with the grid electrodes of a nineteenth resistor (R19) and a seventh MOS tube (Q7), and the other end of the nineteenth resistor (R19) is connected with a +5V power supply port;
the drain electrode of the fourth MOS tube (Q4) is connected with a twelfth resistor (R12), and the other end of the twelfth resistor (R12) is connected with the other end of the thirteenth resistor (R13) and the negative electrode port of the first comparator (U2);
the drain electrode of the fifth MOS tube (Q5) is connected with a thirteenth resistor (R13), and the other end of the thirteenth resistor (R13) is also connected with the other end of a fourteenth resistor (R14);
the drain electrode of the sixth MOS tube (Q6) is connected with a fourteenth resistor (R14), and the other end of the fourteenth resistor (R14) is also connected with the other end of a fifteenth resistor (R15);
the drain electrode of the seventh MOS tube (Q7) is connected with a fifteenth resistor (R15), and the other end of the fifteenth resistor (R15) is connected between a fourth resistor (R4) and a fourth capacitor (C4);
the source electrode of the fourth MOS tube (Q4), the source electrode of the fifth MOS tube (Q5), the source electrode of the sixth MOS tube (Q6) and the source electrode of the seventh MOS tube (Q7) are connected between the fourth resistor (R4) and the grounding end;
the tension sensor is the negative electrode input of the second comparator (U4A), the third comparator (U4B), the fourth comparator (U5A) and the fifth comparator (U5B), and the voltage range output by the tension sensor is 0-5V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211322643.9A CN115514257B (en) | 2022-10-27 | 2022-10-27 | Slow start circuit for electric winch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211322643.9A CN115514257B (en) | 2022-10-27 | 2022-10-27 | Slow start circuit for electric winch |
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| CN115514257A CN115514257A (en) | 2022-12-23 |
| CN115514257B true CN115514257B (en) | 2024-03-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2151581Y (en) * | 1993-02-16 | 1993-12-29 | 西安电工设备厂 | Energy saving controller for motor starting up and operating |
| CN2706453Y (en) * | 2004-06-07 | 2005-06-29 | 杭州天铭机电工具有限公司 | Intelligent control device for electric rope hoist |
| CN201854235U (en) * | 2010-10-19 | 2011-06-01 | 佛山市顺德区瑞德电子实业有限公司 | Simple speed regulation control circuit of PWM (pulse width modulation) DC motor |
| CN103692058A (en) * | 2013-12-31 | 2014-04-02 | 上海广为焊接设备有限公司 | Soft start circuit with power correction circuit inverter-type welding machine |
| CN215072203U (en) * | 2021-03-18 | 2021-12-07 | 深圳和而泰小家电智能科技有限公司 | Soft start circuit and motor |
-
2022
- 2022-10-27 CN CN202211322643.9A patent/CN115514257B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2151581Y (en) * | 1993-02-16 | 1993-12-29 | 西安电工设备厂 | Energy saving controller for motor starting up and operating |
| CN2706453Y (en) * | 2004-06-07 | 2005-06-29 | 杭州天铭机电工具有限公司 | Intelligent control device for electric rope hoist |
| CN201854235U (en) * | 2010-10-19 | 2011-06-01 | 佛山市顺德区瑞德电子实业有限公司 | Simple speed regulation control circuit of PWM (pulse width modulation) DC motor |
| CN103692058A (en) * | 2013-12-31 | 2014-04-02 | 上海广为焊接设备有限公司 | Soft start circuit with power correction circuit inverter-type welding machine |
| CN215072203U (en) * | 2021-03-18 | 2021-12-07 | 深圳和而泰小家电智能科技有限公司 | Soft start circuit and motor |
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| CN115514257A (en) | 2022-12-23 |
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