CN110993439A - Electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment - Google Patents
Electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment Download PDFInfo
- Publication number
- CN110993439A CN110993439A CN201911269824.8A CN201911269824A CN110993439A CN 110993439 A CN110993439 A CN 110993439A CN 201911269824 A CN201911269824 A CN 201911269824A CN 110993439 A CN110993439 A CN 110993439A
- Authority
- CN
- China
- Prior art keywords
- output current
- current value
- electromagnetic switch
- state
- elastic force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001276 controlling effect Effects 0.000 claims abstract description 48
- 230000001105 regulatory effect Effects 0.000 claims abstract description 39
- 238000013016 damping Methods 0.000 claims description 21
- 230000002829 reductive effect Effects 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Relay Circuits (AREA)
Abstract
The invention discloses an electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment. Wherein, the device includes: the force sensor is arranged on a spring inside the electromagnetic switch and used for detecting the elastic force of the spring; the first end of the control module is connected with the force sensor, the second end of the control module is connected with the adjusting circuit and used for judging the state of the electromagnetic switch according to the elastic force detected by the force sensor and controlling the output current value of the adjusting circuit according to the state of the electromagnetic switch; the output end of the regulating circuit is connected with the coil of the electromagnetic switch and is used for changing the output current value under the control of the control module.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to an electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment.
Background
In the application of the alternating current electromagnetic switch in the traditional electric appliance, the initial current required by the coil is larger when the alternating current electromagnetic switch is switched on so as to provide enough electromagnetic force to attract the movable iron core, but the current required by the coil is reduced after the movable and static contacts are attracted, the traditional alternating current electromagnetic switch still keeps the initial large current after attraction, so that the electric energy is wasted, and meanwhile, because the heat dissipation space of the electromagnetic switch is narrow and small, a large amount of heat resistance is accumulated in the coil, the insulating layer of the coil is easily damaged, or the temperature rise exceeds the standard, so that the safety of the electric appliance is endangered.
Aiming at the problems that the electromagnetic switch in the prior art still keeps initial current after being attracted, so that electric energy is wasted and heating is caused, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides an electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment, and aims to solve the problems that in the prior art, an electromagnetic switch still keeps initial current after being attracted, so that electric energy is wasted and heating is caused.
In order to solve the above technical problem, the present invention provides an electromagnetic switch control device capable of realizing energy saving control, wherein the device comprises:
the force sensor is arranged on a spring inside the electromagnetic switch and used for detecting the elastic force of the spring;
the first end of the control module is connected with the force sensor, the second end of the control module is connected with the adjusting circuit and used for judging the state of the electromagnetic switch according to the elastic force detected by the force sensor and controlling the output current value of the adjusting circuit according to the state of the electromagnetic switch;
and the output end of the regulating circuit is connected with a coil of the electromagnetic switch and is used for changing the output current value under the control of the control module.
Further, the control module includes:
the first judging unit is used for judging that the electromagnetic switch is in a non-attraction state when the elastic force is smaller than a first preset value;
the second judging unit is used for judging that the electromagnetic switch is in an excessive attraction state when the elastic force is greater than or equal to a second preset value;
the third judging unit is used for judging that the electromagnetic switch is in an attraction state when the elastic force is greater than or equal to a first preset value and is smaller than a second preset value;
the elastic force is greater than or equal to the first preset value, and is smaller than the second preset value, so that the elastic force interval can ensure that the switch maintains a stable attraction state.
Further, the control module further comprises:
the first control unit is used for controlling the output current value of the regulating circuit to be equal to the initial output current value when the electromagnetic switch is in a non-attraction state;
the second control unit is used for controlling the output current value of the regulating circuit to start to attenuate when the electromagnetic switch is in an excessive attraction state;
and the third control unit is used for controlling the output current value of the regulating circuit to stop attenuating when the electromagnetic switch is in a pull-in state.
Further, the second control unit is specifically configured to:
calculating an output current value according to a preset relation between the output current value and the initial output current value;
and controlling the actual output current value according to the calculated output current value.
Further, the preset relationship between the output current value and the initial output current value is as follows:
Y(t)＝[Q·e-kt+(1-Q)]·I(t)，
wherein, y (t) is the output current value, Q is the current attenuation amplitude coefficient, which is the set value, the value range is (0, 1), e represents the base of the natural logarithm, k is the attenuation speed coefficient, i (t) is the initial output current value, and t is the time.
Further, the control module further comprises:
and the fourth control unit is used for controlling the attenuation speed coefficient k to be reduced when the change rate of the elastic force is greater than a preset threshold value so as to reduce the attenuation speed of the output current value of the regulating circuit.
Further, the adjusting circuit includes: and the RLC damping oscillation circuit is used for changing the damping under the control of the control module so as to control the output current value of the regulating circuit.
The invention also provides electrical equipment comprising the electromagnetic switch control device.
The invention also provides an electromagnetic switch control method capable of realizing energy-saving control, which is applied to the electromagnetic switch control device capable of realizing energy-saving control and is characterized by comprising the following steps:
detecting the elastic force of a spring inside the electromagnetic switch;
judging the state of the electromagnetic switch according to the elastic force, wherein the state comprises a disconnection state, an excessive suction state and a suction state;
and controlling the output current value of the regulating circuit according to the state of the electromagnetic switch.
Further, the determining the state of the electromagnetic switch according to the elastic force includes:
if the elasticity is smaller than a first preset value, the electromagnetic switch is judged to be in a non-attraction state;
if the elastic force is greater than or equal to a second preset value, the electromagnetic switch is judged to be in an excessive attraction state;
and if the elastic force is greater than or equal to a first preset value and less than a second preset value, judging that the electromagnetic switch is in an attraction state.
The elastic force is greater than or equal to the first preset value, and is smaller than the second preset value, so that the elastic force interval can ensure that the switch maintains a stable attraction state.
Further, controlling the output current value of the regulating circuit according to the state of the electromagnetic switch includes:
if the electromagnetic switch is in a non-attraction state, controlling the output current value of the adjusting circuit to be equal to the initial output current value;
if the electromagnetic switch is in an excessive attraction state, controlling the output current value of the regulating circuit to start to attenuate;
and if the electromagnetic switch is in an attraction state, controlling the output current value of the regulating circuit to stop attenuating.
Further, if the electromagnetic switch is in an excessive pull-in state, controlling the output current value of the adjusting circuit to start to attenuate includes:
calculating an output current value according to a preset relation between the output current value and the initial output current value;
and controlling the actual output current value according to the calculated output current value.
Further, the preset relationship between the output current value and the initial output current value is as follows:
Y(t)＝[Q·e-kt+(1-Q)]·I(t)，
wherein, y (t) is the output current value, Q represents the current attenuation amplitude coefficient, which is the set value, the value range is (0, 1), e represents the base of the natural logarithm, k is the attenuation speed coefficient, i (t) is the initial output current value, and t is the time.
Further, while controlling the output current value to gradually decay according to a preset relationship between the output current value and the initial output current value, the method further includes:
obtaining the change rate of the elastic force;
and if the change rate is larger than a preset threshold value, controlling the attenuation speed coefficient k to be reduced so as to reduce the current attenuation speed.
Further, controlling the actual output current value according to the calculated output current value includes:
and adjusting the damping in the RLC damping oscillation circuit to enable the actual output current value to be equal to the calculated output current value.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the above-mentioned method.
By applying the technical scheme of the invention, the state of the electromagnetic switch is judged through the elastic force fed back by the spring in the electromagnetic switch, and the current passing through the coil of the electromagnetic switch is further adjusted according to the state of the electromagnetic switch, so that the current passing through the coil is gradually attenuated to the minimum current capable of keeping the electromagnetic switch in an actuation state, the power consumption of the coil and an iron core is reduced to the maximum extent while the contact of the electromagnetic switch is ensured to be reliably actuated, the electric energy is saved, meanwhile, the problem of internal heating of the electromagnetic switch can be relieved, and the reliability and the service life of an electric appliance are improved.
Drawings
Fig. 1 is a structural view of an electromagnetic switch control apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram of a control module according to an embodiment of the present invention;
fig. 3 is a structural view of an electromagnetic switch control apparatus according to another embodiment of the present invention;
fig. 4 is a diagram showing the structure of an electromagnetic switch control device according to an embodiment of the present invention and the connection relationship thereof with a load circuit;
FIG. 5 is a diagram of an internal structure of an energy-saving cooling module according to an embodiment of the invention;
fig. 6 is a waveform diagram of an output current using the electromagnetic switch control device of the present invention;
fig. 7 is a flowchart of an electromagnetic switch control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the control units in the embodiments of the present invention, the control units should not be limited to these terms. These terms are only used to distinguish between different control units. For example, a first control unit may also be referred to as a second control unit, and similarly, a second control unit may also be referred to as a first control unit, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides an electromagnetic switch control device capable of implementing energy-saving control, and fig. 1 is a structural diagram of an electromagnetic switch control device implemented according to the present invention, as shown in fig. 1, the device includes: a force sensor 12 disposed on a spring inside the electromagnetic switch 11, for detecting an elastic force of the spring; a control module 13, a first end of which is connected to the force sensor 12, and a second end of which is connected to the adjusting circuit 14, and is configured to determine a state of the electromagnetic switch 11 according to the elastic force detected by the force sensor 12, and control an output current value of the adjusting circuit 14 according to the state of the electromagnetic switch 11; and the output end of the regulating circuit 14 is connected with the coil of the electromagnetic switch 11, and is used for changing the output current value under the control of the control module 13.
In this embodiment, the electromagnetic switch 11 is connected to an electrical equipment circuit including a power source 15 and a load 16, and whether the load is powered on or not is controlled by the connection and disconnection of the electromagnetic switch 11, when the electromagnetic switch 11 needs to be connected, an initial current needs to be input to the coil of the electromagnetic switch 11 to power the electromagnet in the electromagnetic switch 11, so as to provide sufficient electromagnetic force to attract the armature, because a larger electromagnetic force is needed from the separation to the attraction between the contacts to break the original mechanical equilibrium state, the coil of the electromagnetic switch 11 needs a larger initial current to attract the contacts of the electromagnetic switch 11, but after the moving and static contacts are attracted, a new mechanical equilibrium is formed, at this time, a relatively smaller electromagnetic force is needed to ensure the attraction of the contacts of the electromagnetic switch 11, because the electromagnetic force is positively correlated with the current introduced to the coil, therefore, in the case that a relatively small electromagnetic force is required, the current required by the coil of the electromagnetic switch 11 is reduced, and if an initial current is still input into the coil of the electromagnetic switch 11, the contacts will be in an excessive attraction state, which causes unnecessary power loss, and a large amount of resistance heat is accumulated in the coil, which easily causes damage to the insulating layer of the coil.
In this embodiment, after the force sensor 12 detects the elastic force on the spring of the electromagnetic switch 11, whether the switch is in the excessive attraction state can be determined by the elastic force on the spring, and when the electromagnetic switch 11 is in the excessive attraction state, the output current value of the regulating circuit 14 is controlled to be reduced, so that the input current value of the coil of the electromagnetic switch 11 is reduced, but if the input current value of the coil is continuously reduced all the time, the electromagnetic force is insufficient to maintain the attraction of the contacts, and at this time, the contacts are disconnected, so that the load circuit is disconnected.
The electromagnetic switch control device of this embodiment, the state of electromagnetic switch is judged through the inside spring feedback's of electromagnetic switch elasticity, and then the electric current that passes through in the electromagnetic switch coil is adjusted according to electromagnetic switch's state, the electric current that makes in the coil pass through attenuates gradually to the minimum current that can make electromagnetic switch keep the actuation, furthest reduces coil and iron core consumption when guaranteeing electromagnetic switch's contact reliable actuation, realize the saving of electric energy, can alleviate the inside problem that generates heat of electromagnetic switch simultaneously, promote the reliability and the life-span of electrical apparatus.
Example 2
In order to accurately determine the state of the electromagnetic switch 11 according to the spring force detected by the force sensor 12, so as to adjust the output current value of the regulating circuit 14 accurately, as shown in fig. 2, the control module includes: the first judging unit 131 is used for judging that the electromagnetic switch is in a non-attraction state when the elastic force is smaller than a first preset value; the second judging unit 132 is configured to judge that the electromagnetic switch is in an excessive attraction state when the elastic force is greater than or equal to a second preset value; the third judging unit 133 is configured to judge that the electromagnetic switch 11 is in an attraction state when the elastic force is greater than or equal to a first preset value and is less than a second preset value; the elastic force is larger than or equal to the first preset value and smaller than the second preset value, the elastic force interval can ensure that the switch maintains a stable attraction state, contacts of the electromagnetic switch cannot shake in the elastic force interval, when the elastic force of the spring is located in the elastic force interval, the attraction force between the contacts of the electromagnetic switch 11 is also located in the elastic force interval according to the mechanical balance principle, because the elastic force interval can ensure that the switch maintains the stable attraction state, when the elastic force of the spring is lower than the elastic force interval, the attraction force between the contacts is insufficient, the contacts can be disconnected and are changed into an unadhered state, and when the elastic force of the spring is higher than the elastic force interval, the attraction force between the contacts is too large, and the contact is in an excessive attraction state.
In this embodiment, in order to realize that the output current value of the adjusting circuit 14 is adjusted accurately in the following step according to the state of the electromagnetic switch 11, so as to avoid the electromagnetic switch 11 being turned off by mistake or being pulled in excessively, as shown in fig. 2, the control module further includes: the first control unit 134 is configured to control an output current value of the adjusting circuit 14 to be equal to an initial output current value when the electromagnetic switch 11 is in a non-attraction state; the second control unit 135 is used for controlling the output current value of the regulating circuit 14 to start to attenuate when the electromagnetic switch 11 is in an excessive attraction state; and the third control unit 136 is used for controlling the output current value of the regulating circuit 14 to stop attenuating when the electromagnetic switch 11 is in the attraction state. When the electromagnetic switch 11 is in a non-attracting state, it is determined that the electromagnetic force of the electromagnet in the electromagnetic switch 11 is insufficient, and therefore, the first control unit 134 needs to control the output current value of the regulating circuit 14 to maintain an initial output current value, so that the current input by the coil of the electromagnetic switch 11 is a larger current, and the contacts of the electromagnetic switch 11 are attracted, after the contacts of the electromagnetic switch 11 are attracted, the control module continues to determine the state of the electromagnetic switch 11 through the spring force, and after it is determined that the electromagnetic switch 11 is in an excessive attracting state, the second control unit 135 controls the output current value of the regulating circuit 14 to start to attenuate, so as to reduce the current in the whole loop, save the electric energy, and as the output current value of the regulating circuit 14 attenuates, the attracting force between the contacts of the electromagnetic switch 11 is reduced, and the elastic force detected by the force sensor 12 is also reduced, when the spring force decreases to the above-mentioned preset value, the output current value of the regulating circuit 14 is controlled by the third control unit 136 to stop attenuating, and the current value is maintained, so as to avoid the contact opening of the electromagnetic switch 11.
Specifically, in this embodiment, the second control unit is specifically configured to: calculating an output current value according to a preset relationship between the output current value and an initial output current value, and controlling an actual output current value according to the calculated output current value, wherein specifically, the preset relationship between the output current value and the initial output current value is as follows: y (t) ([ Q · e)-kt+(1-Q)]And i (t), where y (t) is an output current value, Q is a current attenuation amplitude coefficient, Q is a set value, a value range is (0, 1), e represents a base of a natural logarithm, k is an attenuation speed coefficient, i (t) is an initial output current value, and t is time.
In addition, it should be noted that, in order to highlight the focus of the present invention, only a scheme that the control module controls the current input by the coil of the electromagnetic switch 11 according to the spring force is provided in the embodiment of the present invention, but it should be known to those skilled in the art that the action of controlling the contact attraction of the electromagnetic switch 11 is executed after receiving the instruction of controlling the conduction of the load 16 in the above embodiment.
In this embodiment, in order to control the current attenuation speed and avoid the rapid decrease of the current input by the coil, so that the contact attraction force of the electromagnetic switch 11 rapidly decreases below a preset value, which causes the occurrence of a sudden disconnection between the contacts, the control module further includes: and a fourth control unit, configured to control the attenuation speed coefficient k to decrease when the change rate of the elastic force is greater than a preset threshold value, so as to decrease the attenuation speed of the output current value of the adjusting circuit 14, and when the change of the elastic force is too fast, the attenuation speed coefficient k may be decreased, so as to decrease the attenuation speed of the output current value of the adjusting circuit 14, and further decrease the speed of the input current attenuation of the coil of the electromagnetic switch 11, so as to decrease the electromagnetic force of the electromagnet of the electromagnetic switch 11 more slowly, and avoid sudden disconnection of the electromagnetic switch 11.
In particular implementations, the adjustment circuit may include: the RLC damping oscillation circuit is configured to change a damping magnitude under the control of the control module to control an output current value of the adjusting circuit, and specifically, the damping of the RLC damping oscillation circuit may be increased to control the attenuation of the output current value of the adjusting circuit.
Fig. 3 is a structural diagram of an electromagnetic switch control device according to another embodiment of the present invention, and in a specific implementation, in order to reduce harmonics of a coil input current, as shown in fig. 3, on the basis of the above embodiment, an LC filter circuit 17 is further disposed between the regulating circuit 14 and the coil of the electromagnetic switch 11, for filtering harmonics in the circuit.
In practical implementation, in order to solve the problem of power supply of the control module 13, as shown in fig. 3, the control module 13 is further connected to the power supply 15 described above, so that the power supply supplies power to the control module. In addition, in order to control whether the control module 13 is powered on or not, a switch K is further arranged between the control module 13 and the power supply, and the switch K is connected with a main control board in the electrical equipment and is controlled by the main control board to be turned on or off.
In specific implementation, since the elastic force detected by the force sensor 12 is an analog signal, in order to convert the analog signal detected by the force sensor 12 into a digital signal, as shown in fig. 3, an analog-to-digital converter 18 is further disposed between the force sensor 12 and the control module 13, and is used for converting the analog signal detected by the force sensor 12 into a digital signal and outputting the digital signal to the control module 13.
Example 3
The embodiment provides an electromagnetic switch control device capable of realizing energy-saving control, which solves the problems of large heat productivity, temperature rise failure and high energy consumption of an alternating current contactor after being kept connected from the aspects of electric control design and control principle:
fig. 4 is a diagram illustrating a structure of an electromagnetic switch control device and a connection relationship between the electromagnetic switch control device and a load circuit according to an embodiment of the present invention. As shown in fig. 4, the apparatus includes an energy saving and temperature reducing module 41, where the energy saving and temperature reducing module 41 is respectively connected to a neutral line and a live line in a load circuit, and a main control board 42 in the load circuit actively controls a current of a coil KM1 of an ac contactor 44 by using the load circuit (i.e., an electrical equipment circuit in the above embodiment), when a control logic of the main control board 42 determines that the ac contactor 44 is to be closed, a circuit of a first switch K1 and a second switch K2 in the main control board 42 is turned on, and a current of the live line is introduced into the energy saving and temperature reducing module 41 through an interface X3, and the energy saving and temperature reducing module 41 can simultaneously draw a dc power from the main control board 42 for supplying power to a control chip therein. The interface CN2 introduces the output signal of the pressure sensor 43 of the spring arranged below the movable iron core (i.e., the armature in the above embodiment) into the energy-saving temperature-reducing module 41, and adjusts the attenuation amplitude and the attenuation speed of the current output to the coil KM1 by the pressure signal fed back, so as to effectively control the current in the coil KM 1.
Fig. 5 is an internal structure diagram of an energy saving and temperature reducing module according to an embodiment of the present invention, and as shown in fig. 5, the energy saving and temperature reducing module includes: the RLC damping oscillator circuit 411, the LC passive filter circuit 412, the digital-to-analog converter 413, and the live wire current enters the RLC damping oscillator circuit from the interface X3, and the input and output relationships thereof are: y (t) ([ Q · e)-kt+(1-Q)]And i (t), wherein i (t) is a · sin (2 pi ft), which is a time-varying function of an input current waveform, and output y (t) is a function of an output current, a parameter Q controls a current attenuation amplitude of the coil KM1 (the parameter range is 0-1), a parameter k controls a current attenuation speed of the coil KM1, and e represents a base of a natural logarithm, and a current output from the RLC ringing circuit 411 enters the LC passive filter circuit 412, and is filtered by the LC passive filter circuit 412 to remove harmonics, and then is input to the coil KM 1.
The pressure signal collected by the pressure sensor 43 is converted into a digital control signal by the digital-to-analog converter 413, and the digital control signal is input to the RLC damping oscillator circuit 411 to control the current attenuation amplitude and the attenuation speed output by the RLC damping oscillator circuit 411.
The pressure sensor 43 is disposed at the bottom end of the spring below the moving contact of the ac contactor 44, and when the pressure sensor 43 detects that the spring pressure is small, y (t) is controlled to be [ Q · e ]-kt+(1-Q)]The parameter Q in i (t) is 0, that is, it represents that the current output by the RLC damping oscillation circuit 411 does not attenuate, a large starting current is provided to break the balance state of the movable iron core, and when the pressure value of the pressure sensor reaches stability after the movable iron core of the ac contactor 44 is stably attracted, the value of Q is set according to the actual conditions of different contactors, so as to control the attenuation of the input current of the coil KM 1. The attenuation speed k is controlled to improve the reliability of pull-in, and the attenuation time is prolonged to ensure that the current of the coil KM1 is limited after the contact is reliably pulled in.
Fig. 6 is a waveform diagram of an output current of an electromagnetic switch control device according to the present invention, and as shown in fig. 6, when an input current is a single-phase ac sine wave, the output current decays to a stable current value with time, increasing the parameter Q can increase the decay amplitude, and increasing the parameter k can increase the decay rate, so that the current of the coil KM1 is more quickly decreased to the minimum value required for maintaining stable attraction of the contacts.
Example 5
The present embodiment provides an electromagnetic switch control method capable of implementing energy saving control, and fig. 7 is a flowchart of an electromagnetic switch control method according to an embodiment of the present invention, as shown in fig. 7, the method includes:
s101, detecting the elastic force of a spring in an electromagnetic switch, wherein the elastic force can be tensile force or pressure force, is determined by the internal structure of the electromagnetic switch, and can also be detected through a force sensor, the type of the force sensor is selected according to the type of the elastic force, and the type of the force sensor comprises a pressure sensor, a tension sensor and the like;
s102, judging the state of the electromagnetic switch according to the elastic force, wherein the state comprises a disconnection state, an excessive suction state and a suction state; in specific implementation, in order to accurately judge the state of the electromagnetic switch according to the spring force detected by the force sensor so as to conveniently and precisely adjust the output current value of the regulating circuit, the method for judging the state of the electromagnetic switch according to the spring force comprises the following steps: if the elasticity is smaller than a first preset value, the electromagnetic switch is judged to be in a non-attraction state; if the elastic force is greater than or equal to a second preset value, the electromagnetic switch is judged to be in an excessive attraction state; and if the elastic force is greater than or equal to a first preset value and less than a second preset value, judging that the electromagnetic switch is in an attraction state. The elastic force is larger than or equal to the first preset value and smaller than the second preset value, the elastic force interval can ensure that the switch maintains a stable attraction state, contacts of the electromagnetic switch cannot shake in the elastic force interval, when the elastic force of the spring is located in the interval, the attraction force between the contacts of the electromagnetic switch is also located in the interval according to a mechanical balance principle, because the elastic force interval can ensure that the switch maintains the stable attraction state, when the elastic force of the spring is lower than the interval, the attraction force between the contacts is insufficient, the contacts can be disconnected and are changed into a non-attraction state, and when the elastic force of the spring is higher than the interval, the attraction force between the contacts is too large, and the contact is in an excessive attraction state.
S103, controlling an output current value of the adjusting circuit according to the state of the electromagnetic switch, in order to realize that the output current value of the adjusting circuit 14 is accurately adjusted subsequently according to the state of the electromagnetic switch 11, so as to avoid the electromagnetic switch 11 being turned off by mistake or being pulled in excessively, S103 specifically includes: if the electromagnetic switch is in a non-attraction state, controlling the output current value of the adjusting circuit to be equal to the initial output current value; if the electromagnetic switch is in an excessive attraction state, controlling the output current value of the regulating circuit to start to attenuate; and if the electromagnetic switch is in an attraction state, controlling the output current value of the regulating circuit to stop attenuating.
When the electromagnetic switch is in a non-attracting state, the electromagnetic force of an electromagnet in the electromagnetic switch is insufficient, therefore, the output current value of the regulating circuit needs to be controlled to keep an initial output current value, so that the current input by a coil of the electromagnetic switch is larger current, the contact of the electromagnetic switch is attracted, after the contact of the electromagnetic switch is attracted, the control module continues to judge the state of the electromagnetic switch through the elastic force of the spring, when the electromagnetic switch is judged to be in a excessive attracting state, the output current value of the regulating circuit is controlled to start attenuation so as to reduce the current in the whole loop, the electric energy is saved, along with the attenuation of the output current value of the regulating circuit, the attracting force between the contacts of the electromagnetic switch is reduced, the detected elastic force is reduced, and after the elastic force is reduced to the above-mentioned preset value, the output current value of the regulating circuit is controlled to stop attenuation, the current value is maintained to avoid opening of the contacts of the electromagnetic switch.
Specifically, if the electromagnetic switch is in an excessive attraction state, controlling the output current value of the adjusting circuit to start to attenuate includes: calculating an output current value according to a preset relation between the output current value and the initial output current value; controlling the actual output current value according to the calculated output current value, wherein the preset relation is as follows: y (t) ([ Q · e)-kt+(1-Q)]And I (t), wherein Y (t) is an output current value, Q represents a current attenuation amplitude coefficient and is a set value, the value range is (0, 1), e represents the base of a natural logarithm, k is an attenuation speed coefficient, I (t) is an initial output current value, and t is time.
In specific implementation, in order to control the current attenuation speed and avoid the rapid decrease of the current input by the coil, so that the contact attraction force of the electromagnetic switch 11 rapidly decreases below a preset value to cause the condition of sudden disconnection between contacts, the method further includes the following steps of controlling the output current value to gradually attenuate according to a preset relationship between the output current value and the initial output current value: acquiring the change rate of the elastic force, wherein the calculation method of the change rate can be to set a preset time length and calculate the ratio of the difference value of the two detected elastic forces to the preset time length, so as to obtain the change rate of the elastic force; and if the change rate is larger than a preset threshold value, controlling the attenuation speed coefficient k to be reduced so as to reduce the attenuation speed of the output current value of the regulating circuit.
In a specific implementation, the controlling the actual output current value according to the calculated output current value includes: and adjusting the damping in the RLC damping oscillation circuit to enable the actual output current value to be equal to the calculated output current value, and specifically, controlling the attenuation of the output current value of the adjusting circuit by increasing the damping of the RLC damping oscillation circuit.
According to the electromagnetic switch control method, the state of the electromagnetic switch is judged through the elastic force fed back by the spring in the electromagnetic switch, and then the current passing through the coil of the electromagnetic switch is adjusted according to the state of the electromagnetic switch, so that the current passing through the coil is gradually attenuated to the minimum current capable of enabling the electromagnetic switch to keep actuation, the power consumption of the coil and an iron core is reduced to the maximum extent while the contact of the electromagnetic switch is ensured to be reliably actuated, the electric energy is saved, meanwhile, the problem of internal heating of the electromagnetic switch can be relieved, and the reliability and the service life of an electric appliance are improved.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (16)
1. An electromagnetic switch control apparatus, characterized in that the apparatus comprises:
the force sensor is arranged on a spring inside the electromagnetic switch and used for detecting the elastic force of the spring;
the first end of the control module is connected with the force sensor, the second end of the control module is connected with the adjusting circuit and used for judging the state of the electromagnetic switch according to the elastic force detected by the force sensor and controlling the output current value of the adjusting circuit according to the state of the electromagnetic switch;
and the output end of the regulating circuit is connected with a coil of the electromagnetic switch and is used for changing the output current value under the control of the control module.
2. The apparatus of claim 1, wherein the control module comprises:
the first judging unit is used for judging that the electromagnetic switch is in a non-attraction state when the elastic force is smaller than a first preset value;
the second judging unit is used for judging that the electromagnetic switch is in an excessive attraction state when the elastic force is greater than or equal to a second preset value;
the third judging unit is used for judging that the electromagnetic switch is in an attraction state when the elastic force is greater than or equal to a first preset value and is smaller than a second preset value;
the elastic force is greater than or equal to the first preset value, and is smaller than the second preset value, so that the elastic force interval can ensure that the switch maintains a stable attraction state.
3. The apparatus of claim 2, wherein the control module comprises further comprising:
the first control unit is used for controlling the output current value of the regulating circuit to be equal to the initial output current value when the electromagnetic switch is in a non-attraction state;
the second control unit is used for controlling the output current value of the regulating circuit to start to attenuate when the electromagnetic switch is in an excessive attraction state;
and the third control unit is used for controlling the output current value of the regulating circuit to stop attenuating when the electromagnetic switch is in a pull-in state.
4. The apparatus according to claim 3, wherein the second control unit is specifically configured to:
calculating an output current value according to a preset relation between the output current value and the initial output current value;
and controlling the actual output current value according to the calculated output current value.
5. The apparatus of claim 4, wherein the predetermined relationship between the output current value and the initial output current value is:
Y(t)＝[Q·e-kt+(1-Q)]·I(t)，
wherein, y (t) is the output current value, Q is the current attenuation amplitude coefficient, which is the set value, the value range is (0, 1), e represents the base of the natural logarithm, k is the attenuation speed coefficient, i (t) is the initial output current value, and t is the time.
6. The apparatus of claim 5, wherein the control module further comprises:
and the fourth control unit is used for controlling the attenuation speed coefficient k to be reduced when the change rate of the elastic force is greater than a preset threshold value so as to reduce the current attenuation speed.
7. The apparatus of claim 1, wherein the adjustment circuit comprises: and the RLC damping oscillation circuit is used for changing the damping under the control of the control module so as to control the output current value of the regulating circuit.
8. An electrical apparatus, characterized in that it comprises an electromagnetic switch control device according to any one of claims 1 to 7.
9. An electromagnetic switch control method applied to the electromagnetic switch control device according to any one of claims 1 to 7, characterized by comprising:
detecting the elastic force of a spring inside the electromagnetic switch;
judging the state of the electromagnetic switch according to the elastic force, wherein the state comprises a disconnection state, an excessive suction state and a suction state;
and controlling the output current value of the regulating circuit according to the state of the electromagnetic switch.
10. The method of claim 9, wherein determining the state of the electromagnetic switch based on the spring force comprises:
if the elasticity is smaller than a first preset value, the electromagnetic switch is judged to be in a non-attraction state;
if the elastic force is greater than or equal to a second preset value, the electromagnetic switch is judged to be in an excessive attraction state;
and if the elastic force is greater than or equal to a first preset value and less than a second preset value, judging that the electromagnetic switch is in an attraction state.
The elastic force is greater than or equal to the first preset value, and is smaller than the second preset value, so that the elastic force interval can ensure that the switch maintains a stable attraction state.
11. The method of claim 10, wherein controlling the output current value of the regulation circuit according to the state of the electromagnetic switch comprises:
if the electromagnetic switch is in a non-attraction state, controlling the output current value of the adjusting circuit to be equal to the initial output current value;
if the electromagnetic switch is in an excessive attraction state, controlling the output current value of the regulating circuit to start to attenuate;
and if the electromagnetic switch is in an attraction state, controlling the output current value of the regulating circuit to stop attenuating.
12. The method of claim 11, wherein controlling the output current value of the regulating circuit to begin to decay if the electromagnetic switch is in an over-engaged state comprises:
calculating an output current value according to a preset relation between the output current value and the initial output current value;
and controlling the actual output current value according to the calculated output current value.
13. The method of claim 12, wherein the predetermined relationship between the output current value and the initial output current value is:
Y(t)＝[Q·e-kt+(1-Q)]·I(t)，
wherein, y (t) is the output current value, Q represents the current attenuation amplitude coefficient, which is the set value, the value range is (0, 1), e represents the base of the natural logarithm, k is the attenuation speed coefficient, i (t) is the initial output current value, and t is the time.
14. The method of claim 13, wherein while controlling the output current value to gradually decay in accordance with a predetermined relationship between the output current value and the initial output current value, the method further comprises:
obtaining the change rate of the elastic force;
and if the change rate is larger than a preset threshold value, controlling the attenuation speed coefficient k to be reduced so as to reduce the attenuation speed of the output current value of the regulating circuit.
15. The method of claim 12, wherein controlling the actual output current value based on the calculated output current value comprises:
and adjusting the damping in the RLC damping oscillation circuit to enable the actual output current value to be equal to the calculated output current value.
16. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 9 to 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911269824.8A CN110993439B (en) | 2019-12-11 | 2019-12-11 | Electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911269824.8A CN110993439B (en) | 2019-12-11 | 2019-12-11 | Electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110993439A true CN110993439A (en) | 2020-04-10 |
| CN110993439B CN110993439B (en) | 2020-11-27 |
Family
ID=70092565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911269824.8A Active CN110993439B (en) | 2019-12-11 | 2019-12-11 | Electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110993439B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040223283A1 (en) * | 2003-05-05 | 2004-11-11 | Nikon Corporation | Adaptive gain adjustment for electromagnetic devices |
| CN101656136A (en) * | 2009-04-29 | 2010-02-24 | 陈国顺 | Energy saving magnetic head and control method thereof |
| US20190131047A1 (en) * | 2017-10-30 | 2019-05-02 | Te Connectivity Corporation | Solenoid actuator with fast analog controlled economizer |
-
2019
- 2019-12-11 CN CN201911269824.8A patent/CN110993439B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040223283A1 (en) * | 2003-05-05 | 2004-11-11 | Nikon Corporation | Adaptive gain adjustment for electromagnetic devices |
| CN101656136A (en) * | 2009-04-29 | 2010-02-24 | 陈国顺 | Energy saving magnetic head and control method thereof |
| US20190131047A1 (en) * | 2017-10-30 | 2019-05-02 | Te Connectivity Corporation | Solenoid actuator with fast analog controlled economizer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110993439B (en) | 2020-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2010292346B2 (en) | Systems and methods for polyphase alternating current transformer inrush current limiting | |
| EP1451668B1 (en) | Sensing socket assembly | |
| EP2469554B1 (en) | Hybrid switch circuit | |
| US20130334212A1 (en) | Induction heating device | |
| KR102154635B1 (en) | Coil drive appatatus | |
| JP6077511B2 (en) | Electromagnetic valve drive control device and electromagnetic valve provided with electromagnetic valve drive control device | |
| CN102790405B (en) | Method for controlling magnetizing inrush current through wave chopping and voltage regulating | |
| CN111425540A (en) | Electromagnetic brake control device | |
| JP3662781B2 (en) | Reactive power compensation system | |
| CN110993439B (en) | Electromagnetic switch control device and method capable of realizing energy-saving control and electrical equipment | |
| CN201156501Y (en) | Electromagnetical controller apparatus for AC contactor | |
| CN211951275U (en) | Electromagnetic brake control device | |
| CN105575728A (en) | Relay control method | |
| JP2017500684A (en) | Controlled switching device and method of use | |
| US10504674B2 (en) | DC adaptor for driving magnetic contactor | |
| TW201014139A (en) | Flyback switching power supply and control method thereof | |
| US9083315B2 (en) | Circuit configuration for eliminating EMC interference | |
| CN217956692U (en) | Pre-charged excitation circuit | |
| WO2018173220A1 (en) | Audio system and power supply circuit | |
| CN111092435A (en) | Adjustable intelligent capacitor | |
| JP5652896B2 (en) | Switching power supply and electronic equipment using the switching power supply | |
| RU126231U1 (en) | AC VOLTAGE STABILIZER | |
| EP3116080A1 (en) | A high efficiency limiter circuit | |
| US20220336175A1 (en) | Relay module | |
| CN115291554A (en) | Control device of caliper disc type electromagnetic brake |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |