CN110223881A - Contactor control circuit and contactor coil voltage control method - Google Patents
Contactor control circuit and contactor coil voltage control method Download PDFInfo
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- CN110223881A CN110223881A CN201910303991.3A CN201910303991A CN110223881A CN 110223881 A CN110223881 A CN 110223881A CN 201910303991 A CN201910303991 A CN 201910303991A CN 110223881 A CN110223881 A CN 110223881A
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- 239000003381 stabilizer Substances 0.000 claims description 12
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
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Abstract
Contactor control circuit and contactor coil voltage control method of the present invention, the voltage collection circuit of contactor control circuit is connect with power circuit, for acquiring the current supply voltage of power circuit, the input terminal of control circuit and the output end of voltage collection circuit connect, control circuit is according to current supply voltage adjustment duty ratio to export control signal, the input terminal of driving circuit and the output end of control circuit connect, the output end of driving circuit is connect with switch element, driving circuit receives the control signal that control circuit issues, control switch element is turned on and off；Switch element is connect with coil, the presence or absence of the voltage at the on-off control coil both ends of switch element.Contactor coil voltage control method adjusts duty ratio according to current power voltage and coil Current Temperatures to export control signal, controls the voltage at control coil both ends, and contactor control circuit performance safety of the present invention is stablized, simple and compact for structure, at low cost.
Description
Technical field
The present invention relates to Low Voltage Electrical Apparatus, in particular to a kind of contactor control circuit and coil voltage control method.
Background technique
Traditional contactors by coil obtain it is electric after lower core generate magnetic force make upper core overcome reset spring elastic force run, on
Iron core drives moving contact movement to contact with static contact.A.C. contactor is a kind of low-voltage electrical apparatus of frequent operation, and use scope is wide
It is general.Control coil voltage specification is more, and existing exchange control has DC control again,
Currently, needing to configure different coils for same cage product stock, and need to match with corresponding voltage when use,
Scene use is comparatively laborious, and coil maintains power consumption relatively high.With the development of automatic technology, there are some current mode controls
The method of ac contactor coil processed, but be transformed using power supply chip, coil working voltage range is not wide enough, electricity
Road design is complicated.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, a kind of performance safety stabilization is provided, it is simple and compact for structure,
Contactor control circuit and contactor coil voltage control method at low cost.
To achieve the above object, present invention employs following technical solutions:
A kind of contactor control circuit, including power circuit, voltage collection circuit, control circuit, driving circuit, switch member
Part and coil；
The input terminal of the power circuit is connect for taking electricity, the output end and voltage acquisition of power circuit with external power supply
Circuit, control circuit, switch element and coil are connected as voltage collection circuit, control circuit, switch element and coil power supply；
The input terminal of the voltage collection circuit is connect with power circuit, for acquiring the current power supply electricity of power circuit
Pressure, the input terminal of control circuit and the output end of voltage collection circuit connect,
Control circuit exports control signal according to current supply voltage adjustment duty ratio, the input terminal of driving circuit with
The output end of control circuit connects, and the output end of driving circuit is connect with switch element, and driving circuit receives control circuit and issues
Control signal, control switch element is turned on and off；
The switch element is connect with coil, the presence or absence of the voltage at the on-off control coil both ends of switch element.
It preferably, further include temperature collection circuit, the input terminal of temperature collection circuit is connect with coil, for obtaining coil
Temperature, the output end of temperature collection circuit connects to the control circuit, and the temperature signal for the coil that will acquire is sent to control electricity
Road；The control circuit temperature current according to current supply voltage and coil, and then duty ratio is adjusted to export control letter
Number.
It preferably, further include EMI circuit, the EMI circuit in parallel is in the input terminal side of power circuit；EMI circuit packet
Inductance L1, varistor RV1, capacitor C2 and capacitor C1 are included, capacitor C1 and capacitor C2 are connected in the both ends of inductance L1 in parallel, electricity
Hold C1 close to power circuit side, for capacitor C2 close to external power supply side, varistor RV1 is connected in capacitor C2 in parallel close to outer
The side of portion's power supply.
Preferably, the power circuit includes rectification circuit, decompression voltage regulator；The input terminal of the rectification circuit and outer
The connection of portion's power supply, the output end of rectification circuit are connect with decompression voltage regulator；The rectification circuit is full-wave rectification bridge BR1；Drop
Decompression voltage regulator described in pressure voltage regulator circuit includes resistance R1, resistance R2, triode Q1, resistance R7, resistance R8, triode Q2,
Resistance R11, resistance R14, triode Q3, voltage-stabiliser tube D1, capacitor C3, capacitor C8, Transient Suppression Diode TVS2, capacitor C9, electricity
Hold C14, voltage stabilizing chip VOT1, capacitor C15；The capacitor C3 is connected in the output end of rectification circuit, resistance R1 and resistance in parallel
One end of R2 and the negative pole of output end of rectification circuit connect, and resistance R1, resistance R7, resistance R11 and voltage-stabiliser tube D1 are sequentially connected in series company
It connects, one end of voltage-stabiliser tube D1 and the output head anode of rectification circuit connect, resistance R2 triode Q1, resistance R8, triode Q2, electricity
After resistance R14, triode Q3, capacitor C8 are sequentially connected in series, one end of capacitor C8 and the output head anode of rectification circuit are connected,
The base stage of triode Q1 is connect with the intermediate node of resistance R1 and resistance R7, the base stage and resistance R7 and resistance of triode Q2
The intermediate node of R11 connects, and the base stage of triode Q3 is connect with the intermediate node of resistance R11 and voltage-stabiliser tube D1, and transient state inhibits two
Pole pipe TVS2 and capacitor C9 is successively connected in one end of capacitor C8 in parallel；One end of capacitor C9 is grounded, the other end and capacitor C14 and
Voltage stabilizing chip VOT1 connection, the output pin of voltage stabilizing chip are connect with capacitor C15, capacitor C14, voltage stabilizing chip VOT1 and capacitor C15
Another foot ground connection；Wherein capacitor C9 returns driving circuit and provides power supply；Voltage stabilizing chip VOT1 powers to control circuit.
Preferably, the voltage collection circuit includes resistance R3, resistance R4, resistance R5, resistance R9, resistance R12, capacitor
C4, Transient Suppression Diode TVS1；Resistance R3 is connect with power circuit in voltage collection circuit, other end series resistance R4, electricity
R4 series resistance R5, resistance R5 series resistance R9, resistance R9 series resistance R12, resistance R12 and capacitor C4 are hindered, transient state inhibits two
Pole pipe TVS1 is in parallel, resistance R12 and capacitor C4, Transient Suppression Diode TVS1 other end ground connection；The section of resistance R9 and resistance R12
Point provides signals to control circuit.
Preferably, the control circuit includes control chip U1, capacitor C6 and capacitor C7, resistance R15 and capacitor C10；Control
The third pin of coremaking piece U1 and the output end of voltage collection circuit connect, and control the 8th pin and control chip U1 of chip U1
The 19th pin ground connection, capacitor C6 and capacitor C7 it is in parallel after one end connect with the 20th pin for controlling chip U1, it is another
The intermediate node of end ground connection, resistance R15 and capacitor C10 are connect with the first pin of control chip U1.Preferably, the control
Circuit includes control chip U1, capacitor C6 and capacitor C7；Control the third pin of chip U1 and the output end of voltage collection circuit
Connection, controls the 8th pin of chip U1 and the 19th pin ground connection of control chip U1, capacitor C6 and capacitor C7 it is in parallel after
One end is connect with the 20th pin of control chip U1, other end ground connection, controls the 7th pin and temperature acquisition electricity of chip U1
The output end on road connects, and the intermediate node of resistance R15 and capacitor C10 are connect with the first pin of control chip U1.
Preferably, the temperature collection circuit includes thermistor R6, resistance R10, resistance R13 and capacitor C5, the heat
One end after quick resistance R6, resistance R10, resistance R13 series connection is connect with stabilized power source, other end ground connection, and capacitor C5 is in parallel
The both ends of resistance R13 are connected to, thermistor R6 is close to installation, connecting line and control between resistance R10 and resistance R13 with coil
Circuit connection processed.
Preferably, the driving circuit includes driving chip U2, capacitor C12, capacitor C11, resistance R17, resistance R18, electricity
Hold C13, resistance R16 and diode D2；The input terminal of driving chip U2 connects to the control circuit, the power end of driving chip U2 with
One end after capacitor C12 is in parallel with capacitor C11 connect, capacitor C12 and capacitor C11 it is in parallel after the other end be grounded, driving chip
The ground terminal of U2 is grounded, and the output end of driving chip U2 is connect with one end of resistance R17, the other end and switch member of resistance R17
Part is connected with one end of resistance R18, anode of the other end of resistance R18 after capacitor C13 and resistance R16 with diode D2
Connection, parallel connection of coil are connect in the both ends of diode D2, the anode of diode D2 with switch element.
The present invention also provides a kind of contactor coil voltage control methods, which comprises
Obtain supply voltage currently entered；
Current coil temperature is obtained, according to the corresponding relationship of coil temperature and coil resistance, based on current coil temperature
Degree obtains current coil resistance；
Coil current when being kept when holding based on coil resistance * is obtained coil and keeps voltage, and current power voltage is based on
Keep voltage to obtain current holding duty ratio with coil, according to keeping duty ratio, to the voltage at the coil both ends of contactor into
Row is adjusted, and makes contactor in reliable hold mode.
Preferably, coil current when starting based on coil resistance * starting obtains coil starting voltage, based on current
Supply voltage and coil starting voltage obtain current starting duty ratio, according to starting duty ratio, to the coil both ends of contactor
Voltage be adjusted, act contactor.
Preferably, coil temperature is obtained by the thermistor being close to coil.
Contactor control circuit of the present invention, including power circuit, voltage collection circuit, control circuit, driving circuit, switch
Element and coil；Control circuit receive the collected current supply voltage of voltage collection circuit, control circuit according to currently
Voltage signal, and then duty ratio is adjusted to export control signal, control circuit calculates duty ratio by acquiring current voltage
Value, driving switch element change contactor coil voltage, realize the starting and holding of coil, it is offline to reach different voltages
Both end voltage substantially constant is enclosed, so that coil both end voltage average value be made to stablize, coil working voltage range is wider, circuit structure
Simple and compact, coil power dissipation is low, at low cost.
Further, contactor control circuit of the present invention further includes temperature collection circuit, for obtaining the temperature of coil, is controlled
The current temperature of the coil that the collected current supply voltage of circuit reception voltage collection circuit and temperature collection circuit acquire
Degree, the control circuit temperature current according to current power supply voltage signal and coil, and then duty ratio is adjusted to export control letter
Number, driving switch element changes the voltage of the coil of contactor, realizes the starting and holding of coil, reaches coil both end voltage base
This is constant, so that coil both end voltage average value be made to stablize, control circuit is current according to current power supply voltage signal and coil
Temperature, and then adjust duty ratio to export control signal, contactor control circuit performance is more reliable and more stable, coil working electricity
Wider range is pressed, circuit structure is simple and compact, and coil power dissipation is low, at low cost.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of embodiment of contactor control circuit of the present invention；
Fig. 2 is the structural block diagram of another embodiment of contactor control circuit of the present invention；
Fig. 3 is the partial circuit diagram that the present invention connects power circuit；
Fig. 4 is the physical circuit figure of voltage collection circuit of the present invention；
Fig. 5 is the circuit diagram of the control circuit of an embodiment of the present invention；
Fig. 6 is the circuit diagram of the control circuit of another embodiment of the invention；
Fig. 7 is the circuit diagram of present invention driver circuit；
Fig. 8 is the partial circuit diagram of voltage step-down voltage regulator circuit of the present invention；
Fig. 9 is the partial circuit diagram of voltage step-down voltage regulator circuit of the present invention.
Specific embodiment
Below in conjunction with the embodiment that attached drawing 1 to 9 provides, contactor control circuit and contactor of the invention are further illustrated
The specific embodiment of coil voltage control method.Contactor control circuit contactor coil voltage control method of the invention is not
It is limited to the following description.
As shown in Figure 1, contactor control circuit of the present invention, including power circuit, voltage collection circuit, control circuit are driven
Dynamic circuit, switch element and coil；The input terminal of power circuit is connect for taking electricity, the output end of power circuit with external power supply
With voltage collection circuit, control circuit, switch element and coil be connected as voltage collection circuit, control circuit, switch element and
Coil power supply；The input terminal of voltage collection circuit is connect with power circuit, for acquiring the current supply voltage letter of power circuit
Number, the input terminal of control circuit and the output end of voltage collection circuit connect, and control circuit receives voltage collection circuit and collects
Current power supply voltage signal；Control circuit adjusts duty ratio to export control signal according to current voltage signal,
The input terminal of driving circuit and the output end of control circuit connect, and the output end of driving circuit is connect with switch element, driving electricity
Road receives the control signal that control circuit issues, and control switch element is turned on and off；Switch element is connect with coil, switch
The presence or absence of the voltage at the on-off control coil both ends of element.
Contactor control circuit of the present invention, including power circuit, voltage collection circuit, control circuit, driving circuit, switch
Element and coil；Control circuit receive the collected current supply voltage of voltage collection circuit, control circuit according to currently
Supply voltage, and then duty ratio is adjusted to export control signal, driving switch element changes the voltage of the coil of contactor, realizes
The starting and holding of coil reach different electrical power voltage lower coil both end voltage substantially constant, to keep coil both end voltage flat
Mean value is stablized, and coil working voltage range is wider, and circuit structure is simple and compact, and coil power dissipation is low, at low cost.
As shown in figure 3, contactor control circuit of the present invention further includes EMI circuit.EMI circuit in parallel is in the defeated of power circuit
Enter to hold side；EMI circuit includes inductance L1, varistor RV1, capacitor C2 and capacitor C1, and capacitor C1 and capacitor C2 are connected in parallel
At the both ends of inductance L1, capacitor C1 is close to power circuit side, and for capacitor C2 close to external power supply side, varistor RV1 is in parallel
Capacitor C2 is connected to close to the side of external power supply.EMI circuit can filter out interference of the high-frequency impulse to power supply of extraneous power grid,
It is also reduced Switching Power Supply itself simultaneously to extraneous electromagnetic interference.
As shown in Fig. 3,8,9, power circuit of the present invention includes rectification circuit, decompression voltage regulator；The input of rectification circuit
End is connect with external power supply, and the output end of rectification circuit is connect with decompression voltage regulator；Rectification circuit is full-wave rectification bridge BR1；
Decompression voltage regulator includes resistance R1, resistance R2, triode Q1, resistance R7, resistance R9, triode Q2, resistance R11, resistance
R14, triode Q3, voltage-stabiliser tube D1, capacitor C3, capacitor C8, Transient Suppression Diode TVS2, capacitor C9, capacitor C14, pressure stabilizing core
Piece VOT1, capacitor C15；Capacitor C3 is connected in the output end of rectification circuit, one end and rectified current of resistance R1 and resistance R2 in parallel
The negative pole of output end on road connects, and resistance R1, resistance R7, resistance R11 and voltage-stabiliser tube D1 are sequentially connected in series, one end of voltage-stabiliser tube D1
It is connect with the output head anode of rectification circuit, resistance R2Q1, triode Q1, resistance R8, triode Q2, resistance R14, triode
After Q3, capacitor C8 are sequentially connected in series, one end of capacitor C8 and the output head anode of rectification circuit are connected, the base stage of triode Q1
It is connect with the intermediate node of resistance R1 and resistance R7, the base stage of triode Q2 and the intermediate node of resistance R7 and resistance R11 connect
It connects, the base stage of triode Q3 is connect with the intermediate node of resistance R11 and voltage-stabiliser tube D1, Transient Suppression Diode TVS2 and capacitor C9
Successively it is connected in one end of capacitor C8 in parallel；One end of capacitor C9 is grounded, and the other end and capacitor C14 and voltage stabilizing chip VOT1 connect
It connects, the output pin of voltage stabilizing chip is connect with capacitor C15, another foot ground connection of capacitor C14, voltage stabilizing chip VOT1 and capacitor C15；
Wherein capacitor C9 returns driving circuit and provides power supply；Voltage stabilizing chip VOT1 powers to control circuit.Power circuit using resistance with
The decompression decompression voltage regulator of triode, diode composition, is also possible to DC-DC reduction voltage circuit or LDO reduction voltage circuit.
As shown in figure 4, voltage collection circuit of the present invention include in voltage collection circuit resistance R3 connect with power circuit, separately
One end series resistance R4, resistance R4 series resistance R5, resistance R5 series resistance R9, resistance R9 series resistance R12, resistance R12 with
Capacitor C4, Transient Suppression Diode TVS1 is in parallel, resistance R12 and capacitor C4, Transient Suppression Diode TVS1 other end ground connection；Electricity
The node of resistance R9 and resistance R12 provides signals to control circuit.Voltage collection circuit is used to acquire the current of power circuit output
Power supply voltage signal.
As shown in fig. 6, control circuit of the present invention includes control chip U1, capacitor C6 and capacitor C7；Control the of chip U1
The connection of the output end of three-prong and voltage collection circuit controls the 8th pin of chip U1 and the 19th pin of control chip U1
One end after ground connection, capacitor C6 and capacitor C7 parallel connection is connect with the 20th pin of control chip U1, other end ground connection, resistance
The intermediate node of R15 and capacitor C10 are connect with the first pin of control chip U1.Control circuit of the present invention can also using single-chip microcontroller
To be special driving chip.
As shown in fig. 7, driving circuit includes driving chip U2, capacitor C12, capacitor C11, resistance R17, resistance R18, capacitor
C13, resistance R16 and diode D2；The input terminal of driving chip U2 connects to the control circuit, the power end and electricity of driving chip U2
Hold C12 it is in parallel with capacitor C11 after one end connect, capacitor C12 and capacitor C11 it is in parallel after the other end be grounded, driving chip U2
Ground terminal ground connection, the output end of driving chip U2 connect with one end of resistance R17, the other end and switch element of resistance R17
It is connected with one end of resistance R18, the other end of resistance R18 connects after capacitor C13 and resistance R16 with the anode of diode D2
It connects, parallel connection of coil is connect in the both ends of diode D2, the anode of diode D2 with switch element.Driving chip U2 can be adopted
With the driving chip of model FAN3111E, present invention driver circuit uses special purpose driver, can also be made of discrete device.
Such as figure switch element is metal-oxide-semiconductor Q4, can also be using pliotron or IGBT etc..
Illustrate the working principle of contactor control circuit of the present invention below with reference to Fig. 1,3,6,7,8,9:
After contactor control circuit is connected, control circuit is needed coil most by supply voltage value after detection rectification
Small starting voltage value is compared with present sample supply voltage value.
When supply voltage value after rectification is greater than coil minimum starting voltage value, by coil minimum starting voltage and rectification
Supply voltage ratio is adjusted the voltage at the coil both ends of contactor according to starting duty ratio as starting duty ratio afterwards,
Power tube is moved through overdrive circuit rear-guard, certain time is connected, act contactor；Reconvert makes at lesser holding duty ratio
Coil both end voltage average value is lower, provides small holding voltage and meets contactor in reliable hold mode, coil is kept
Supply voltage ratio is as duty ratio is kept after voltage and rectification, according to duty ratio is kept, to the electricity at the coil both ends of contactor
Pressure is adjusted, and smaller maintenance coil space ratio changes with rectified voltage and adjusted, so that it is average to reach coil both end voltage
Value is stablized.It is given value that the coil minimum starting voltage value and coil, which keep voltage,.Certainly, start duty ratio and holding
Duty ratio, in addition to keeping voltage respectively and other than the method for rectified voltage ratio using coil minimum starting voltage and coil,
It can calculate in other manners.
When voltage value after rectification is lower than predetermined close value, control circuit closes duty ratio output, and power tube is cut-off
State, coil are in an off state without maintenance voltage, contactor.
Fig. 2 is the structural schematic diagram of another contactor control circuit provided by the invention.
As shown in Fig. 2, contactor control circuit of the present invention, including power circuit, voltage collection circuit, control circuit are driven
Dynamic circuit, switch element, temperature collection circuit and coil；The input terminal of power circuit is connect for taking electricity with external power supply, electricity
The output end and voltage collection circuit, control circuit, switch element and coil of source circuit are connected as voltage collection circuit, control electricity
Road, switch element and coil power supply；The input terminal of voltage collection circuit is connect with power circuit, current for acquiring power circuit
Power supply voltage signal, the output end of the input terminal of control circuit and voltage collection circuit connects, receives voltage collection circuit and adopt
The current supply voltage collected；Temperature collection circuit is connect with coil, for obtaining the temperature of coil, temperature collection circuit
Output end connects to the control circuit, and the temperature signal of the coil for will acquire is sent to control circuit；Control circuit is according to working as
The current temperature of preceding supply voltage and coil, and then adjust duty ratio to export control signal, the input terminal of driving circuit with
The output end of control circuit connects, and the output end of driving circuit is connect with switch element, and driving circuit receives control circuit and issues
Control signal, control switch element is turned on and off；Switch element is connect with coil, the on-off control coil of switch element
The presence or absence of the voltage at both ends.
Contactor control circuit of the present invention, including power circuit, voltage collection circuit, control circuit, driving circuit, switch
Element, temperature collection circuit and coil；Control circuit receives the collected current supply voltage of voltage collection circuit, Yi Jiwen
The current temperature of the coil of degree Acquisition Circuit acquisition, the control circuit temperature current according to current supply voltage and coil, into
And duty ratio is adjusted to export control signal, driving switch element changes the voltage of the coil of contactor, realizes the starting of coil
And holding, reach coil both end voltage substantially constant, so that coil both end voltage average value be made to stablize, control circuit is according to current
Supply voltage and the current temperature of coil, and then adjust duty ratio to export control signal, contactor control circuit performance is more
Add reliable and stable, coil working voltage range is wider, and circuit structure is simple and compact, and coil power dissipation is low, at low cost.
As shown in Fig. 2, the temperature collection circuit is connect with coil, for obtaining the temperature of coil, temperature acquisition electricity
The output end on road connects to the control circuit, and the temperature signal of the coil for will acquire is sent to control circuit.
As shown in figure 5, control circuit of the present invention includes control chip U1, capacitor C6 and capacitor C7；Control the of chip U1
The connection of the output end of three-prong and voltage collection circuit controls the 8th pin of chip U1 and the 19th pin of control chip U1
One end after ground connection, capacitor C6 and capacitor C7 parallel connection is connect with the 20th pin of control chip U1, and other end ground connection controls core
The 7th pin of piece U1 and the output end of temperature collection circuit connect, the intermediate node and control chip of resistance R15 and capacitor C10
The first pin of U1 connects.It controls chip U1 and uses single-chip microcontroller.
As shown in figure 5, temperature collection circuit includes thermistor R6, resistance R10, resistance R13 and capacitor C5, single-chip microcontroller
Acquire the pressure drop that resistance R13 is generated, one end and 5V stabilized power source after thermistor R6, resistance R10, resistance R13 series connection
Connection, other end ground connection, capacitor C5 are connected in the both ends of resistance R13 in parallel, and thermistor R6 is close to installation, resistance with coil
Connecting line between R10 and resistance R13 connects to the control circuit, and resistance R10 and resistance R13 are divider resistance, single-chip microcontroller acquisition
The pressure drop that resistance R13 is generated.Obviously, temperature collection circuit can also be realized using other temperature sensors, be passed by temperature
Sensor acquires coil temperature.
In the embodiment depicted in figure 2, power circuit, voltage collection circuit, driving circuit can be with realities shown in earlier figures 1
It applies in example using identical circuit, different circuits can also be used.
Illustrate the working principle of contactor control circuit of the present invention below with reference to Fig. 2,3,4,5,6,7,8,9:
After contactor control circuit is connected, control circuit obtains the supply voltage value after rectification by voltage collection circuit,
The minimum starting voltage value that coil is needed is compared with the current power voltage value of sampling.
When current supply voltage value is greater than coil minimum starting voltage value, by coil minimum starting voltage and power supply electricity
The ratio of pressure moves power tube through overdrive circuit rear-guard and certain time is connected, reconvert is at lesser guarantor as starting duty ratio
Holding duty ratio keeps coil both ends average value lower, and meets contactor in reliable hold mode.The smaller holding for maintaining coil accounts for
Sky is adjusted than changing with rectified voltage variation and coil temperature, is stablized to reach coil both end voltage average value.Work as line
When enclosing temperature change, control circuit passes through temperature collection circuit read coil temperature and calculates coil resistance at this time, in conjunction with this
When the supply voltage value COMPREHENSIVE CALCULATING that inputs go out duty ratio.Thermistor patch is fitted closely with coil, and coil temperature passes to heat
For quick resistance to change thermistor resistance value, thermistor and the circuit input supply voltage that divider resistance forms are constant, work as heat
When the resistance value of quick resistance varies with temperature, the pressure drop of divider resistance and temperature have corresponding relationship, to obtain the temperature of coil, line
The temperature corresponding relationship directly proportional to coil resistance is enclosed, resistance becomes larger when the temperature increases, obtains coil temperature by test of many times
The corresponding relationship of degree and coil resistance.Single-chip microcontroller is written in room temperature lower coil resistance, and the single-chip microcontroller that circuit connects control circuit is read
The input voltage of power circuit calculates starting current, coil both ends according to I=U/R when reaching starting voltage threshold
Voltage can by adjust duty ratio obtain ideal value；Make coil both ends average value changing lesser holding duty ratio into after starting
It is lower, small holding voltage is provided and meets contactor in reliable hold mode, holding when coil temperature raising, coil resistance
Increase, coil current when being kept based on coil resistance * is obtained coil and keeps voltage, and coil is kept voltage and input power electricity
Pressure ratio value increases the voltage at coil both ends as duty ratio is kept, by increasing duty ratio, ensure that coil current is constant.
Otherwise coil temperature reduces, and coil resistance becomes smaller, and coil current when coil resistance * is kept obtains coil and keeps voltage, coil
It keeps voltage to become smaller, makes the reduction of coil both end voltage by reducing duty ratio, guarantee that coil current is constant, ensure that contactor
Startup power is stable at different temperatures for coil, function is kept to stablize.
When voltage value after rectification is lower than predetermined close value, control circuit closes duty ratio output, and power tube is cut-off
State, coil are in an off state without maintenance voltage, contactor.
Embodiment changes PWM according to the size of supply voltage after overvoltage Acquisition Circuit detects supply voltage and accounts for
Sky is realized than size and is controlled the voltage of coil, and the acting characteristic of contactor is completed.The disadvantage is that with environment temperature or product
Coil resistance can become larger after itself generates heat, and the duty ratio in identical input voltage in conventional art PWM does not change
Change becomes smaller so as to cause coil current, and the suction-combining force of contactor, which becomes smaller, causes the acting characteristic of contactor to change.The present invention
The temperature of coil is acquired by temperature collection circuit, realizes function of temperature compensation control, coil resistance becomes larger PWM's when the temperature increases
Duty ratio also changes, to improve coil both end voltage, approaches before electric current and heating to reach in coil, to protect
It is consistent close to acting characteristic is maintained contactor the suction-combining force the suction-combining force under same voltage different temperatures has been hindered.(coil minimum starting
Voltage, which refers to this voltage just, makes contactor operation voltage.Voltage when greater than this minimum starting voltage can be allowed to movement also
It can be described as starting voltage.The starting voltage of product identification is generally higher than minimum starting voltage.)
Based on the embodiment of above-mentioned contactor control circuit, the present invention also provides a kind of contactor coil voltage controlling parties
Method, which comprises
Obtain supply voltage currently entered；
Current coil temperature is obtained, according to the corresponding relationship of coil temperature and coil resistance, based on current coil temperature
Degree obtains current coil resistance；
Coil current when being started when starting based on coil resistance * obtains coil starting voltage, based on current power supply electricity
Pressure and coil starting voltage obtain current starting duty ratio, according to starting duty ratio, to the voltage at the coil both ends of contactor
It is adjusted, acts contactor；
Coil current when being kept when holding based on coil resistance * is obtained coil and keeps voltage, based on current power supply electricity
Pressure and coil keep voltage to obtain current holding duty ratio, according to duty ratio is kept, to the voltage at the coil both ends of contactor
It is adjusted, makes contactor in reliable hold mode.
Supply voltage can be obtained based on voltage collection circuit of the invention, that is, the voltage after rectifying, coil temperature can be with base
It is obtained in temperature sampling circuit of the invention, temperature sampling circuit can be temperature sensor, can also be obtained based on thermistor
It takes.Coil current when coil current when starting and holding is given value, keeps duty ratio that can keep electricity based on coil
Pressure and the ratio of supply voltage obtain, can also be using other calculations, the corresponding relationship of coil temperature and coil resistance
For given value, when buying, can be obtained by supplier, can also be passed through experiment and be obtained.Coil temperature can not be considered when starting, pressed
The mode of embodiment one starts, and considers that current power voltage and coil temperature output keep duty ratio when holding.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (12)
1. a kind of contactor control circuit, it is characterised in that: including power circuit, voltage collection circuit, control circuit, driving electricity
Road, switch element and coil；
The input terminal of the power circuit is connect for taking electricity, output end and the voltage acquisition electricity of power circuit with external power supply
Road, control circuit, switch element and coil are connected as voltage collection circuit, control circuit, switch element and coil power supply；
The input terminal of the voltage collection circuit is connect with power circuit, for acquiring the current supply voltage of power circuit, is controlled
The input terminal of circuit processed and the output end of voltage collection circuit connect,
Control circuit is according to current supply voltage adjustment duty ratio to export control signal, the input terminal of driving circuit and control
The output end of circuit connects, and the output end of driving circuit is connect with switch element, and driving circuit receives the control that control circuit issues
Signal processed, control switch element are turned on and off；
The switch element is connect with coil, the presence or absence of the voltage at the on-off control coil both ends of switch element.
2. contactor control circuit according to claim 1, it is characterised in that:
It further include temperature collection circuit, the input terminal of temperature collection circuit is connect with coil, for obtaining the temperature of coil, temperature
The output end of Acquisition Circuit connects to the control circuit, and the temperature signal for the coil that will acquire is sent to control circuit；The control
The circuit temperature current according to current supply voltage and coil, and then duty ratio is adjusted to export control signal.
3. contactor control circuit according to claim 1, it is characterised in that: it further include EMI circuit, the EMI circuit
It is connected in parallel on the input terminal side of power circuit；EMI circuit includes inductance L1, varistor RV1, capacitor C2 and capacitor C1, capacitor
C1 and capacitor C2 is connected in the both ends of inductance L1 in parallel, and capacitor C1 is close to power circuit side, and capacitor C2 is close to external power supply one
Side, varistor RV1 are connected in capacitor C2 in parallel close to the side of external power supply.
4. contactor control circuit according to claim 1, it is characterised in that: the power circuit includes rectification circuit,
Decompression voltage regulator；The input terminal of the rectification circuit is connect with external power supply, output end and the lowering and stabilizing blood pressure electricity of rectification circuit
Road connection；
The rectification circuit is full-wave rectification bridge BR1；
Decompression voltage regulator described in decompression voltage regulator includes resistance R1, resistance R2, triode Q1, resistance R7, resistance R8, three poles
Pipe Q2, resistance R11, resistance R14, triode Q3, voltage-stabiliser tube D1, capacitor C3, capacitor C8, Transient Suppression Diode TVS2, capacitor
C9, capacitor C14, voltage stabilizing chip VOT1, capacitor C15；
The capacitor C3 is connected in the output end of rectification circuit, the output of one end and rectification circuit of resistance R1 and resistance R2 in parallel
Cathode connection is held, resistance R1, resistance R7, resistance R11 and voltage-stabiliser tube D1 are sequentially connected in series, one end of voltage-stabiliser tube D1 and rectified current
The output head anode on road connects, and resistance R2 triode Q1, resistance R8, triode Q2, resistance R14, triode Q3, capacitor C8 are successively
After series connection, one end of capacitor C8 and the output head anode of rectification circuit are connected, the base stage and resistance R1 and electricity of triode Q1
The intermediate node connection of R7 is hindered, the base stage of triode Q2 is connect with the intermediate node of resistance R7 and resistance R11, the base of triode Q3
Pole is connect with the intermediate node of resistance R11 and voltage-stabiliser tube D1, and Transient Suppression Diode TVS2 and capacitor C9 are successively connected in parallel
One end of capacitor C8；One end of capacitor C9 is grounded, and the other end is connect with capacitor C14 and voltage stabilizing chip VOT1, voltage stabilizing chip it is defeated
Foot is connect with capacitor C15 out, another foot ground connection of capacitor C14, voltage stabilizing chip VOT1 and capacitor C15；Wherein capacitor C9 returns drive
Dynamic circuit provides power supply；Voltage stabilizing chip VOT1 powers to control circuit.
5. contactor control circuit according to claim 1, it is characterised in that: the voltage collection circuit includes resistance
R3, resistance R4, resistance R5, resistance R9, resistance R12, capacitor C4, Transient Suppression Diode TVS1；
Resistance R3 is connect with power circuit in voltage collection circuit, other end series resistance R4, resistance R4 series resistance R5, resistance
R5 series resistance R9, resistance R9 series resistance R12, resistance R12 and capacitor C4, Transient Suppression Diode TVS1 is in parallel, resistance R12
With capacitor C4, Transient Suppression Diode TVS1 other end ground connection；The node of resistance R9 and resistance R12 provides signals to control electricity
Road.
6. contactor control circuit according to claim 1, it is characterised in that: the control circuit includes control chip
U1, capacitor C6 and capacitor C7, resistance R15 and capacitor C10；Control the third pin of chip U1 and the output end of voltage collection circuit
Connection, controls the 8th pin of chip U1 and the 19th pin ground connection of control chip U1, capacitor C6 and capacitor C7 it is in parallel after
One end is connect with the 20th pin of control chip U1, other end ground connection, the intermediate node and control of resistance R15 and capacitor C10
The first pin of chip U1 connects.
7. contactor control circuit according to claim 2, it is characterised in that: the control circuit includes control chip
U1, capacitor C6 and capacitor C7；The output end of the third pin and voltage collection circuit that control chip U1 connects, control chip U1's
One end after the 19th pin ground connection of 8th pin and control chip U1, capacitor C6 and capacitor C7 parallel connection is with control chip U1's
The output end of the connection of 20th pin, other end ground connection, the 7th pin and temperature collection circuit that control chip U1 connects, resistance
The intermediate node of R15 and capacitor C10 are connect with the first pin of control chip U1.
8. contactor control circuit according to claim 2, it is characterised in that: the temperature collection circuit includes temperature-sensitive electricity
Hinder R6, resistance R10, resistance R13 and capacitor C5, the thermistor R6, resistance R10, resistance R13 be connected in series after one end with
Stabilized power source connection, other end ground connection, capacitor C5 are connected in the both ends of resistance R13 in parallel, and thermistor R6 is close to peace with coil
Dress, the connecting line between resistance R10 and resistance R13 connect to the control circuit.
9. contactor control circuit according to claim 1, it is characterised in that: the driving circuit includes driving chip
U2, capacitor C12, capacitor C11, resistance R17, resistance R18, capacitor C13, resistance R16 and diode D2；
The input terminal of driving chip U2 connects to the control circuit, and the power end of driving chip U2 is in parallel with capacitor C12 and capacitor C11
Other end ground connection after one end connection afterwards, capacitor C12 and capacitor C11 parallel connection, the ground terminal ground connection of driving chip U2 drive core
The output end of piece U2 is connect with one end of resistance R17, and the other end of resistance R17 is connect with one end of switch element and resistance R18,
The other end of resistance R18 is connect after capacitor C13 and resistance R16 with the anode of diode D2, and parallel connection of coil is in two poles
The anode at the both ends of pipe D2, diode D2 is connect with switch element.
10. a kind of contactor coil voltage control method, which is characterized in that the described method includes:
Obtain supply voltage currently entered；
Current coil temperature is obtained, according to the corresponding relationship of coil temperature and coil resistance, is obtained based on current coil temperature
Obtain coil resistance currently；
Coil current when being kept when holding based on coil resistance * is obtained coil and keeps voltage, and current power voltage and line are based on
Circle keeps voltage to obtain current holding duty ratio, according to duty ratio is kept, adjusts to the voltage at the coil both ends of contactor
Section, makes contactor in reliable hold mode.
11. contactor coil voltage control method according to claim 10, it is characterised in that: based on coil electricity when starting
Coil current when resistance * starting obtains coil starting voltage, is obtained currently based on current supply voltage and coil starting voltage
Starting duty ratio, according to starting duty ratio, the voltage at the coil both ends of contactor is adjusted, contactor is acted.
12. contactor coil voltage control method according to claim 10, it is characterised in that: pass through what is be close to coil
Thermistor obtains coil temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910303991.3A CN110223881A (en) | 2019-04-16 | 2019-04-16 | Contactor control circuit and contactor coil voltage control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910303991.3A CN110223881A (en) | 2019-04-16 | 2019-04-16 | Contactor control circuit and contactor coil voltage control method |
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| CN110223881A true CN110223881A (en) | 2019-09-10 |
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| CN201910303991.3A Pending CN110223881A (en) | 2019-04-16 | 2019-04-16 | Contactor control circuit and contactor coil voltage control method |
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