CN111725025B - Relay zero-crossing switch correction method, detection correction circuit and controller - Google Patents
Relay zero-crossing switch correction method, detection correction circuit and controller Download PDFInfo
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- CN111725025B CN111725025B CN202010465557.8A CN202010465557A CN111725025B CN 111725025 B CN111725025 B CN 111725025B CN 202010465557 A CN202010465557 A CN 202010465557A CN 111725025 B CN111725025 B CN 111725025B
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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
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
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Abstract
The invention discloses a relay zero-crossing switch correction method, a detection correction circuit and a controller, and the method comprises a first zero-crossing detection step, a preset time control step, a second zero-crossing detection step, a preset time adjustment step and a zero-crossing correction step, wherein when second zero-crossing information meets requirements, initial control time matched with the second zero-crossing information meeting the requirements is corrected according to the second zero-crossing information meeting the requirements so as to obtain the zero-crossing switch control time of a relay; this design can detect the relay of different specifications with detection of the same way, through adjustment many times, obtains accurate zero passage switch control time who corresponds this relay to for subsequent control scheme provides the reference, in practical application, can control the contact switch of relay and close or break off at zero point position, thereby reduce the appearance of the phenomenon of striking sparks, improve the durability of relay.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a relay zero-crossing switch correction method, a detection correction circuit and a controller.
Background
The relay component is widely applied to the electronic field as a switch component, the general relay component can be matched with a control module for use, the relay component comprises a coil component and a contact switch, the contact switch comprises a fixed contact and a movable contact, wherein one of the fixed contact and the movable contact is connected with an external power supply, the other one of the fixed contact and the movable contact is connected with a load, the control module is connected with the coil component to control the operation of the coil component, so that the movable contact can be adsorbed to be contacted with the fixed contact for conducting electricity when the coil component is electrified, and the movable contact can be separated from the fixed contact when the coil component is powered off.
When the movable contact is closed close to the fixed contact or separated from the fixed contact, the movable contact and the fixed contact are separated by a small distance, so that air breakdown is easy to occur to cause ignition, and after long-term use, the metal (silver and copper) membrane on the movable contact or the fixed contact is damaged by sparks to influence the use quality of a subsequent relay.
However, the contact switch is connected with alternating current, when external alternating current is located at a zero point position, the movable contact and the fixed contact are closed or disconnected, and ignition cannot happen.
Aiming at the problem that the timing of closing or opening the movable contact and the fixed contact cannot be accurately controlled, manufacturers further improve the method that the zero-crossing time of the external alternating current is detected, the relay is closed or opened in advance when the external alternating current is ready to reach the zero-crossing position, then the response time of the relay is continuously calculated according to the condition reflected by the detection and correction circuit, so that the accurate timing of closing or opening the movable contact and the fixed contact is corrected, however, the method still has the problems, for example, in the practical application, a power supply supplies power to a controller, and the switch cannot be correctly read at a part of time point due to the influence of the power supply (for example, a system power supply contains a switch power supply circuit and a resistance-capacitance voltage reduction circuit), and because the relay is closed, similarly, the waveform after the load is connected can be deviated due to the follow current of the inductive load caused by the disconnection of the relay, so that the waveform after the disconnection can be deviated due to the follow current of the inductive load, and therefore, the conventional detection and correction circuit in the correction mode needs to be divided into two paths for detection, the whole circuit structure is complex, the cost is relatively high, and the situation of inaccurate correction still occurs.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a relay zero-crossing switch correction method, which obtains accurate relay zero-crossing switch control time through multiple times of adjustment.
The invention also provides a detection correction circuit, which adopts a path of detection module to be respectively connected with one end of the contact switch of the relay and one end of the external alternating current to obtain alternating current waveforms before and after the action of the relay, and obtains accurate zero-crossing switch control time of the relay through multiple adjustments.
The invention also provides a controller which can control the relay to operate and adjust the correction parameters according to the acquired detection information about the zero crossing, so as to obtain the accurate control time of the zero crossing switch of the relay.
According to the embodiment of the first aspect of the invention, the relay zero-crossing switch correction method comprises the following steps: a first zero-crossing detection step of detecting first zero-crossing information before the relay is controlled to act; a preset time control step of presetting initial control time according to the first zero-crossing information and controlling the relay to be closed or opened according to the initial control time; a second zero-crossing detection step of detecting second zero-crossing information after the control relay acts, judging whether the second zero-crossing information meets the requirement, and selecting whether to enter a step of adjusting the preset time according to a judgment result of the second zero-crossing information; adjusting the preset time, controlling the relay to reset to a state before action, adjusting the initial control time, controlling the relay to close or open according to the adjusted initial control time, and returning to the second zero-crossing detection step; and a zero-crossing correction step, when the second zero-crossing information meets the requirement, correcting the initial control time matched with the second zero-crossing information meeting the requirement according to the second zero-crossing information meeting the requirement so as to obtain the zero-crossing switch control time of the relay.
The method for correcting the zero-crossing switch of the relay, provided by the embodiment of the invention, at least has the following beneficial effects:
the invention relates to a relay zero-crossing correction method, which comprises the steps of firstly obtaining first zero-crossing information before relay action, roughly presetting initial control time according to the first zero-crossing information, controlling the relay to close or open according to the initial control time, when the closing or opening action time of the relay is too close to a zero point position, the situation that the zero point cannot be obtained possibly exists in detected second zero-crossing information, at the moment, the situation that the closing or opening action time of the relay is before or after the zero point cannot be judged, and the zero-crossing switch control time of a relay cannot be corrected according to the initial control time, therefore, judgment is carried out according to the second zero-crossing information, if the requirement cannot be met, the initial control time is adjusted, the relay is reset to the state before action, the relay is controlled to close or open according to the adjusted initial control time, and after repeated tests, when a certain time, when the closing or opening action moment of the relay and the zero position have enough width, the second zero-crossing information can meet the requirement, the adjusted initial control time and the second zero-crossing information meeting the requirement are corrected to obtain the zero-crossing switch control time of the relay.
According to some embodiments of the present invention, a load data obtaining step is further included between the first zero-crossing detecting step and the preset time controlling step, load condition information is obtained, and in the preset time controlling step, an initial control time is preset according to the load condition information and the first zero-crossing information.
According to some embodiments of the present invention, a power supply data obtaining step is further included between the first zero-crossing detecting step and the preset time controlling step, power supply condition information is obtained, and in the preset time controlling step, an initial control time is preset according to the power supply condition information and the first zero-crossing information.
According to some embodiments of the present invention, in the preset time control step, the advance action time value is preset according to a zero-crossing position in the first zero-crossing information to form the initial control time.
According to some embodiments of the invention, the initial control time is continuously advanced or retarded by a fixed interval value in the step of adjusting the preset time a plurality of times.
A detection correction circuit according to an embodiment of a second aspect of the present invention includes: the detection module comprises a detection end and an output end, and the detection end of the detection module can be respectively connected with one end of a contact switch of the relay and one end of external alternating current; the control module is respectively connected with the output end of the detection module and the relay, and the control module can operate the relay zero-crossing switch correction method disclosed by any embodiment to obtain the relay zero-crossing switch control time.
The detection correction circuit according to the embodiment of the invention has at least the following beneficial effects:
in the detection correction circuit, the detection end of the detection module can be respectively connected with one end of the contact switch of the relay and one end of the external alternating current, when the contact switch of the relay is disconnected, one phase of the external alternating current can flow through the detection module, so that the control module can know the zero-crossing condition of the external alternating current when the relay is disconnected, and when the contact switch of the relay is closed, the control module can also know the zero-crossing condition after loading through the detection module, and at the moment of closing or disconnecting the relay, due to different loads (possibly capacitive or inductive) or different power supplies, when the closing or disconnecting action moment of the relay is excessively close to the zero position, the condition that the zero point cannot be obtained exists in the second zero-crossing information can be detected, but the design can judge whether the initial control time needs to be adjusted or not according to the second zero-crossing information subsequently, the relay is reset to a state before action, the relay is controlled to be closed or opened according to the adjusted initial control time, and repeated tests are carried out for multiple times, the relay closing or opening action time and a zero position have enough width, the second zero-crossing information can meet requirements, the adjusted initial control time and the second zero-crossing information meeting the requirements can be corrected to obtain the zero-crossing switch control time of the relay.
According to some embodiments of the invention, the detection module comprises a voltage detection module capable of detecting first zero-crossing information and second zero-crossing information of the voltage.
According to some embodiments of the invention, the detection module comprises a current detection module capable of detecting second zero-crossing information of the current.
According to some embodiments of the invention, the system further comprises an input module connected with the control module to be able to set load condition information and/or power supply condition information.
A controller according to an embodiment of a third aspect of the present invention includes: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor is enabled to implement a relay zero-crossing switch correction method disclosed in any one of the above embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of one embodiment of a zero crossing correction method of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of the detection and correction circuit of the present invention;
FIG. 3 is a circuit diagram of a second embodiment of the detection and correction circuit of the present invention;
FIG. 4 is a circuit diagram of a third embodiment of the detection and correction circuit of the present invention;
FIG. 5 is a circuit diagram of a fourth embodiment of the detection and correction circuit of the present invention;
FIG. 6 is a circuit diagram of a fifth embodiment of the detection and correction circuit of the present invention;
fig. 7 is a circuit diagram of a sixth embodiment of the detection correction circuit of the present invention.
Reference numerals:
the power supply driving circuit comprises a detection module 100, a voltage detection module 110, a current detection module 120, a control module 200, an input module 300, a load 400 and a power supply driving module 500.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 7, a relay zero-crossing switch correction method according to an embodiment of the present invention includes: a first zero-crossing detection step of detecting first zero-crossing information before the relay is controlled to act; a preset time control step of presetting initial control time according to the first zero-crossing information and controlling the relay to be closed or opened according to the initial control time; a second zero-crossing detection step of detecting second zero-crossing information after the control relay acts, judging whether the second zero-crossing information meets the requirement, and selecting whether to enter a step of adjusting the preset time according to a judgment result of the second zero-crossing information; adjusting the preset time, controlling the relay to reset to a state before action, adjusting the initial control time, controlling the relay to close or open according to the adjusted initial control time, and returning to the second zero-crossing detection step; and a zero-crossing correction step, when the second zero-crossing information meets the requirement, correcting the initial control time matched with the second zero-crossing information meeting the requirement according to the second zero-crossing information meeting the requirement so as to obtain the zero-crossing switch control time of the relay.
It should be noted here that the method may be applied to one-way detection or two-way detection, where the one-way detection is, as shown in fig. 2 and fig. 3, in a certain embodiment, a fixed contact of a contact switch of a relay to be detected is connected to L of alternating current, a movable contact of the contact switch of the relay is connected to N of alternating current, a detection end of the detection module 100 may be respectively connected to one end of the contact switch of the relay and one end of external alternating current, and the two-way detection may be based on the one-way detection, and detection lines respectively connected to L phase and N phase of alternating current may also be added.
The invention relates to a relay zero-crossing correction method, which comprises the steps of firstly obtaining first zero-crossing information before relay action, roughly presetting initial control time according to the first zero-crossing information, controlling the relay to close or open according to the initial control time, when the closing or opening action time of the relay is too close to a zero point position, the situation that the zero point cannot be obtained in detected second zero-crossing information possibly exists, the situation that the closing or opening action time of the relay cannot be judged before or after the zero point easily occurs at the moment, and the zero-crossing switch control time of a relay can not be corrected according to the initial control time, therefore, the judgment is carried out according to the second zero-crossing information, if the requirement cannot be met, the second zero-crossing information is generally judged whether the zero point can be detected or not, and the preset time range can be 2ms-4ms (or other time ranges can be also, according to the actual situation), the initial control time is adjusted, the relay is reset to the state before action, the relay is controlled to be switched on or switched off according to the adjusted initial control time, after repeated tests, when the relay switching-on or switching-off action time and the zero point position have enough width in a certain time, the second zero-crossing information can meet the requirements, and the adjusted initial control time and the second zero-crossing information meeting the requirements are corrected to obtain the zero-crossing switch control time of the relay. The contact switch of the relay can be controlled to be closed or opened at the zero point position, so that the phenomenon of sparking is reduced, and the durability of the relay is improved.
In some embodiments of the present invention, a step of obtaining load data is further included between the first zero-crossing detecting step and the preset time controlling step, and load condition information is obtained, and in the preset time controlling step, an initial control time is preset according to the load condition information and the first zero-crossing information.
Because the alternating current is connected to the load at the rear part through the contact switch of the relay, the load can be resistive, capacitive or inductive, and for the capacitive and inductive loads, the waveform of the external alternating current has a phase difference between the no-load waveform and the loaded waveform, therefore, the parameters related to the capacitive load or the inductive load can be preset, and the user can select the parameters of the load when knowing the connected load condition, so that in the step of obtaining the load data, the load condition information is obtained, and the initial control time is set according to the load condition, so that the initial control time has certain accuracy, and the frequency of the step of subsequently adjusting the preset time is reduced.
Similarly, since the detection signal is input into the control module 200, the power supply supplies power to the control module 200, and within a certain time when the relay is turned on or off, the control module 200 may have a detection deviation, which may also result in a situation where a zero point cannot be obtained in the second zero-crossing information, in some embodiments of the present invention, a power supply data obtaining step is further included between the first zero-crossing detection step and the preset time control step, power supply condition information is obtained, in the preset time control step, an initial control time is preset according to the power supply condition information and the first zero-crossing information, parameters related to the power supply may be preset (parameters may be changed by having a capacitive element or an inductive element in the power supply), and when a user knows the accessed power supply condition, the parameters of the power supply may be selected, therefore, in the step of obtaining the power supply data, the power supply condition information is obtained, and the initial control time is set according to the power supply condition, so that the initial control time has certain accuracy, and the frequency of the step of subsequently adjusting the preset time is reduced.
Generally, in the step of presetting time control, an advance action time value is preset according to a zero-crossing position in the first zero-crossing information to form an initial control time, and since a signal for controlling the action of the relay is output, a signal transmission process and a relay response process both have a certain delay, the advance action time value is generally preset.
In some embodiments of the present invention, in the adjusting the preset time step for multiple times, the initial control time is continuously advanced or delayed by a fixed interval value, generally, taking an ac power frequency of 50Hz in China as an example, one cycle is 20ms, in the advancing or delaying of the initial control time by the fixed interval value, the fixed interval value may be set to 0.5ms, 1ms, 2ms, and the like, the adjustment is performed by the fixed interval value, and in the cycle, a limit of the adjustment times may be made, and generally, a zero point position can be found in the second zero-crossing information within the limited times, so as to obtain a time value delayed by the response action of the relay.
Specifically, for the situation of one-path detection, the flow of the zero-crossing switch control time of relay actuation is obtained as follows:
in an initial state, a contact switch of the relay is disconnected, first zero-crossing information of one phase of alternating current before the relay is controlled to act is detected, and the waveform of the alternating current is obtained; the first zero-crossing information presets initial control time and controls the relay to close according to the initial control time; detecting second zero-crossing information after the relay is controlled to be closed, if the initial control time is set properly, the second zero-crossing information can meet the requirement once, for example, detecting a zero point after 2ms, directly increasing the initial control time by 2ms in a period to obtain the zero-crossing switch control time of the relay, and when the second zero-crossing information does not meet the requirement, controlling the relay to be reset to a state before action (namely an open state), adjusting the initial control time, controlling the relay to be closed according to the adjusted initial control time, detecting the second zero-crossing information again, if the second zero-crossing information still does not meet the requirement, circularly performing the second zero-crossing detection step and the initial time adjustment step again until the second zero-crossing information meets the requirement, correcting the initial control time matched with the second zero-crossing information meeting the requirement according to the second zero-crossing information meeting the requirement, to derive the zero-crossing switch control time of the relay.
The flow of the zero-crossing switch control time for switching off the relay is obtained as follows:
in an initial state, a contact switch of the relay is closed, and first zero-crossing information of the alternating current loaded before the relay is controlled to act is detected to obtain the waveform of the alternating current; the first zero-crossing information presets initial control time, and the relay is controlled to be disconnected according to the initial control time; detecting second zero-crossing information (detected in one phase of alternating current) after the relay is controlled to be closed, if the initial control time is set properly, the second zero-crossing information can meet the requirement once, for example, if a zero point is detected after 2ms, the initial control time is directly increased by 2ms in a period to be the zero-crossing switch control time of the relay, and when the second zero-crossing information does not meet the requirement, the relay needs to be controlled to be reset to a state before action (namely a closed state), the initial control time is adjusted, the relay is controlled to be opened according to the adjusted initial control time, the second zero-crossing information is detected again, if the second zero-crossing information does not meet the requirement, the second zero-crossing detection step and the initial time adjustment step are performed in a circulating mode again until the second zero-crossing information meets the requirement, the initial control time matched with the second zero-crossing information meeting the requirement is corrected according to the second zero-crossing information meeting the requirement, to obtain the zero-crossing switch control time of the relay.
As shown in fig. 2, 3, 4, 5, 6, and 7, the detection correction circuit according to the second embodiment of the present invention includes a detection module 100 and a control module 200, the detection module 100 includes a detection end and an output end, the detection end of the detection module 100 can be connected to one end of a contact switch of a relay and one end of an external alternating current respectively; the control module 200 is connected to the output end of the detection module 100 and the relay, and the control module 200 can operate a relay zero-crossing switch correction method disclosed in any of the above embodiments to obtain the relay zero-crossing switch control time.
After the control module 200 operates the relay zero-crossing correction method to obtain the zero-crossing switch control time of the relay, the control module 200 may control the relay according to the zero-crossing switch control time, or may output the zero-crossing switch control time to the outside as a reference for controlling the relay and a subsequently connected load circuit by other controllers.
As a basic circuit, as shown in fig. 2 to 7, the L phase of the external alternating current is connected to the stationary contact of the contact switch of the relay, the moving contact of the contact switch of the relay is connected to one end of the load 400, the other end of the load 400 is connected to the N phase of the external alternating current, and the external alternating current also supplies power to the control module 200 through the power supply driving module 500, wherein the power supply driving module 500 may be composed of a rectifier bridge, or a rectifier bridge with a resistor-capacitor voltage step-down circuit and a switching power supply circuit.
In the detection and correction circuit of the present invention, the detection end of the detection module 100 can be respectively connected to one end of the contact switch of the relay and one end of the external alternating current, when the relay contact switch is opened, one phase of the external alternating current can flow through the detection module 100, so that the control module 200 can know the zero crossing condition of the external alternating current when the relay contact switch is opened, and the control module 200 can also know the zero crossing condition after loading through the detection module 100, and at the moment when the relay is closed or opened, due to the difference of the load (which may be capacitive or inductive) or the difference of the power supply driving module 500, when the relay is closed or opened, the moment is too close to the zero point position, the zero point condition may not be obtained in the detection of the second zero crossing information, but, the subsequent judgment is performed according to the second zero crossing information, whether the initial control time needs to be adjusted or not is selected, the relay is reset to the state before action, the relay is controlled to be closed or opened according to the adjusted initial control time, and after repeated tests, the closing or opening action time of the relay and the zero position have enough width in a certain time, the second zero-crossing information can meet the requirement, and the adjusted initial control time and the second zero-crossing information meeting the requirement are corrected to obtain the zero-crossing switch control time of the relay. The durability of the relay is improved.
In some embodiments of the present invention, as shown in fig. 2-7, the detection module 100 is a voltage detection module 110, and the voltage detection module 110 is capable of detecting first zero-crossing information and second zero-crossing information of the voltage.
As shown in fig. 2, 4 and 6, taking fig. 2 as an example, the voltage detection module 110 includes a resistor R4, a resistor R5 and a transistor Q2, wherein one end of the resistor R4 is respectively connected to one end of a contact switch of the relay and one end of an external alternating current, the other end of the resistor R4 is connected to one end of a resistor R5, the other end of the resistor R5 is connected to a base of the transistor Q2, a collector of the transistor Q2 is connected to the control module 200, and an emitter of the transistor Q2 is grounded.
Alternatively, as shown in fig. 3, 5 and 7, taking fig. 3 as an example, the voltage detection module 110 includes a resistor R12, a resistor R13 and a resistor R14 to form a voltage dividing circuit, one end of the resistor R12 is connected to one end of a contact switch of the relay and one end of an external alternating current, the other end of the resistor R12 is connected to one end of a resistor R13, the other end of the resistor R13 is connected to one end of the control module 200 and one end of the resistor R14, and the other end of the resistor R14 is grounded.
When the load 400 is an inductive load, when the zero-crossing time of the relay is corrected, the relay is changed from the closed state to the open state, the inductive load continues current, and if the voltage zero-crossing detection is still adopted at this time, the obtained result is not accurate, and the occurrence of the ignition phenomenon still can be caused, so the detection module 100 further comprises a current detection module 120, and the current detection module 120 can detect second zero-crossing information of the current, so that the second zero-crossing information is obtained in the current waveform to judge the zero-point position, and the zero-crossing switch control time can be effectively corrected.
As shown in fig. 4 and 5, taking fig. 4 as an example, the current detecting module 120 may include a resistor R19, a resistor R20, and a photo coupler OC1, one end of the resistor R20 is connected to the movable contact of the relay and one end of the resistor R19, the other end of the resistor R20 is connected to the cathode of the light emitter of the photo coupler OC1, the other end of the resistor R19 is connected to the anode of the light emitter of the photo coupler OC1, the emitting end of the photo receiver of the photo coupler OC1 is grounded, and the collecting end of the photo receiver of the photo coupler OC1 is connected to the control module.
As shown in fig. 6 and 7, taking fig. 6 as an example, the current detection module 120 may include a transformer T1, a diode D15, a resistor R37, and a voltage regulator tube D14, wherein one end of a first coil of the transformer is connected to the movable contact of the relay, the other end of the first coil of the transformer is connected to the load, one end of a second coil of the transformer is connected to the positive electrode of the diode D15, the other end of the diode D5 is connected to the negative electrode of the voltage regulator tube D14 and the control module, the other end of the second coil of the transformer is connected to one end of the resistor R37, and the other end of the resistor R37 and the anode of the voltage regulator tube D14 are both grounded.
According to some embodiments of the present invention, an input module 300 is further included, the input module 300 being connected with the control module 200 to enable input or selection of load condition information.
The input module 300 may be a numeric keypad, and may input load condition information, as shown in fig. 2 and fig. 3, the input module 300 may also be a self-locking key, the control module 200 stores therein condition information of a capacitive load, condition information of an inductive load, capacitive power supply information, and/or inductive power supply information, and selects different load condition information or power supply condition information by a key, and may also display a selection state by an indicator light.
A controller according to an embodiment of a third aspect of the present invention includes: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor is enabled to implement a relay zero-crossing switch correction method disclosed in any one of the above embodiments.
The design controller can detect the relays with different specifications, obtains accurate zero-crossing switch control time corresponding to the relays through multiple times of adjustment, and can control the contact switches of the relays to be closed or disconnected at the zero positions, so that the occurrence of the ignition phenomenon is reduced, and the durability of the relays is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A relay zero-crossing switch correction method is characterized by comprising the following steps:
a first zero-crossing detection step of detecting first zero-crossing information before the relay is controlled to act;
a preset time control step of presetting initial control time according to the first zero-crossing information and controlling the relay to be closed or opened according to the initial control time;
a second zero-crossing detection step of detecting second zero-crossing information after the control relay acts, judging whether the second zero-crossing information meets requirements, and selecting whether to enter a step of adjusting preset time according to a judgment result of the second zero-crossing information, wherein the requirement for judging whether the second zero-crossing information meets comprises whether a zero point can be detected or whether the zero point can be detected within a preset time range;
adjusting the preset time, controlling the relay to reset to a state before action, adjusting the initial control time, controlling the relay to close or open according to the adjusted initial control time, and returning to the second zero-crossing detection step, wherein in the multiple steps of adjusting the preset time, the initial control time is continuously advanced or delayed by a fixed interval value;
and a zero-crossing correction step, when the second zero-crossing information meets the requirement, correcting the initial control time matched with the second zero-crossing information meeting the requirement according to the second zero-crossing information meeting the requirement so as to obtain the zero-crossing switch control time of the relay.
2. A relay zero-crossing switch correction method as claimed in claim 1, characterized in that, between the first zero-crossing detection step and the preset time control step, a load data obtaining step is further included, load condition information is obtained, and in the preset time control step, an initial control time is preset according to the load condition information and the first zero-crossing information.
3. A relay zero-crossing switch correction method as claimed in claim 1 or 2, characterized in that, between the first zero-crossing detection step and the preset time control step, a power supply data obtaining step is further included, power supply condition information is obtained, and in the preset time control step, initial control time is preset according to the power supply condition information and the first zero-crossing information.
4. A relay zero-crossing switch correction method as claimed in claim 3, characterized in that in the preset time control step, the action advance time value is preset according to the zero-crossing position in the first zero-crossing information to form the initial control time.
5. A test correction circuit for testing a relay, comprising:
the detection module comprises a detection end and an output end, and the detection end of the detection module can be respectively connected with one end of a contact switch of the relay and one end of external alternating current;
a control module, which is respectively connected with the output end of the detection module and the relay, wherein the control module can operate a relay zero-crossing switch correction method according to any one of claims 1-4 to obtain the relay zero-crossing switch control time.
6. The detection and correction circuit as claimed in claim 5, wherein said detection module comprises a voltage detection module capable of detecting first zero-crossing information and second zero-crossing information of the voltage.
7. The detection and correction circuit of claim 5, wherein the detection module comprises a current detection module capable of detecting the second zero crossing information of the current.
8. The detection and correction circuit as claimed in claim 5, further comprising an input module connected to said control module to enable setting of load condition information and/or power supply condition information.
9. A controller, comprising:
at least one processor;
at least one memory for storing at least one program;
when executed by the at least one processor, the at least one program causes the at least one processor to implement a relay zero crossing switch correction method as claimed in any one of claims 1-4.
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| US4897755A (en) * | 1988-06-28 | 1990-01-30 | Louis S. Polster | Apparatus and method for relay control |
| CN101577192B (en) * | 2009-06-12 | 2011-05-04 | 百利通电子(上海)有限公司 | Method of zero passage switch of electromagnetic relay and circuit |
| CN101826417A (en) * | 2009-12-17 | 2010-09-08 | 韩燕� | Method and device for controlling low current of relay |
| CN101908439B (en) * | 2010-07-09 | 2012-09-12 | 北海市深蓝科技发展有限责任公司 | Self-adaptive electromagnetic relay zero-crossing on and off control method |
| CN202917398U (en) * | 2012-10-22 | 2013-05-01 | 厦门市芯阳科技有限公司 | Self-adjusting zero-crossing control circuit for electromagnetic relay |
| KR101459369B1 (en) * | 2014-05-19 | 2014-11-07 | (주)컴파스테크놀로지스 | Apparatus and method for controlling the relay |
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| CN105679606B (en) * | 2016-01-28 | 2018-12-25 | 福州大学 | A kind of wireless zero passage on-off switch and control method based on electromagnetic relay |
| CN209133419U (en) * | 2018-11-12 | 2019-07-19 | 深圳和而泰智能控制股份有限公司 | A kind of control relay circuit |
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