CN105227164B - Relay control method and device and induction cooker - Google Patents

Abstract

The invention discloses a control method of a relay, which comprises the following steps: acquiring mechanical turn-on delay time t11 and mechanical turn-off delay time t21 of the relay; acquiring the turn-on delay time ta and the turn-off delay time tb of the relay according to the zero voltage period T of the power supply grid and the mechanical turn-on delay time T11 and the mechanical turn-off delay time T21 of the relay; when the voltage of the power supply grid is zero, a switching-on control signal is output after a delay of ta to control the switching-on of the relay or a switching-off control signal is output after a delay of tb to control the switching-off of the relay, wherein the voltage values corresponding to the time points of t11+ ta and t21+ tb are all in the voltage zero-crossing range. The control method of the relay can ensure that different relays are switched on and off at zero voltage, not only can prolong the service life of the relay, but also can avoid the interference to a power supply grid and improve the stability of the power supply grid. The invention also discloses a control device of the relay and an induction cooker with the control device of the relay.

Description

Relay control method, control device, and induction cooker

technical field

The invention relates to the technical field of relays, in particular to a control method of a relay, a control device of a relay and an induction cooker with the control device.

Background technique

There is a certain mechanical delay in the process of opening and closing the mechanical relay, and the delay time is quite different. Therefore, in the control process of the relay, it is difficult to ensure that its turn-on and turn-off are performed at zero voltage, and turning on and off the relay at a higher voltage not only reduces the service life of the relay, but also turns on and off the relay. It will cause great disturbance to the power grid where it is located.

Therefore, the control of opening and closing the relay needs to be improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to at least solve the above-mentioned technical defects.

Therefore, the first objective of the present invention is to provide a control method for a relay, which can ensure that different relays are turned on and off at zero voltage.

The second object of the present invention is to provide a relay control device. The third object of the present invention is to provide an induction cooker.

In order to achieve the above purpose, a method for controlling a relay proposed by an embodiment of the first aspect of the present invention includes the following steps: obtaining the mechanical turn-on delay time t11 and the mechanical turn-off delay time t21 of the relay; T and the mechanical turn-on delay time t11 and mechanical turn-off delay time t21 of the relay to obtain the turn-on delay time ta and turn-off delay time tb of the relay; when the voltage of the power supply grid crosses zero, delay The turn-on control signal is output after the ta to control the relay to turn on or the turn-off control signal is output after the delay of the tb to control the relay to turn off, wherein the voltage values corresponding to the two time points t11+ta and t21+tb are in the voltage zero-crossing range.

According to the control method of the relay according to the embodiment of the present invention, the mechanical turn-on delay time t11 and the mechanical turn-off delay time t21 of the relay are first obtained, and then the mechanical turn-on delay time t11 and the mechanical turn-off delay time t11 of the relay are obtained according to the zero voltage period T of the power supply grid and the mechanical turn-on delay time t11 of the relay. The turn-off delay time t21 obtains the turn-on delay time ta and the turn-off delay time tb of the relay. Finally, when the voltage of the power supply grid crosses zero, the turn-on control signal is output after the delay ta to control the next relay after ta. Turn on when the voltage crosses zero or output a turn-off control signal after delaying tb to control the relay to turn off at the next zero-crossing point after tb. That is to say, the ta time is delayed when the voltage crosses zero for the first time. At this time, the control signal is output, and the relay will actually turn on after a delay of t11, because the voltage value corresponding to the time point of ta+t11 is within the zero-crossing voltage range. Then the actual turn-on time of the relay is performed within the zero-crossing voltage range. Similarly, the turn-off time is also performed within the voltage zero-crossing range, so as to realize the zero-crossing turn-on or turn-off of the relay, which can not only improve the service life of the relay, To improve the stability and reliability of the circuit, it can also avoid interference to the power supply grid and improve the stability of the power supply grid.

According to an embodiment of the present invention, acquiring the mechanical turn-on delay time t11 of the relay specifically includes: when the turn-on control signal is outputted to the relay, controlling a first timer to start timing, and monitoring the turn-on condition of the relay. Detection; when it is detected that the relay is fully turned on, the first timer is controlled to end the time, wherein the time of the first timer is the mechanical turn-on delay time t11 of the relay.

According to an embodiment of the present invention, acquiring the mechanical turn-off delay time t21 of the relay specifically includes: when outputting the turn-off control signal to the relay, controlling a second timer to start timing, and controlling the turn-off of the relay When it is detected that the relay is completely turned off, the second timer is controlled to end the time, wherein the time of the second timer is the mechanical turn-off delay time t21 of the relay.

Wherein, the ta is equal to mT-t11, the tb is equal to mT-t21, and m is a positive integer. In this way, ta+t11 is equal to mT, and tb+t11 is equal to mT, so that the relay is turned on or off at the zero-crossing point, and the loss of the relay can be minimized.

According to an embodiment of the present invention, the method further includes: detecting the voltage of the power supply grid, and judging that the voltage of the power supply grid crosses zero when the voltage of the power supply grid is less than or equal to a preset voltage, wherein the voltage of the power supply grid crosses zero. Zero usually refers to a small range of voltages around zero.

In order to achieve the above purpose, a relay control device proposed by an embodiment of the second aspect of the present invention includes: a voltage detection circuit, which is used to detect the voltage of a power supply grid to generate a voltage detection signal; a relay control circuit , the relay control circuit is used to control the relay to be turned on or off; the microprocessor is connected to the voltage detection circuit and the relay control circuit respectively, and the microprocessor is based on the power supply grid. The zero voltage period T and the obtained mechanical turn-on delay time t11 and mechanical turn-off delay time t21 of the relay are obtained to obtain the turn-on delay time ta and turn-off delay time tb of the relay, and according to the voltage detection signal When judging that the voltage of the power supply grid crosses zero, the microprocessor outputs a turn-on control signal to the relay control circuit after delaying the ta to control the relay to turn on or delaying the tb to output a turn-off control signal to the relay control circuit. The relay control circuit is used to control the relay to be turned off, wherein the voltage values corresponding to the two time points t11+ta and t21+tb are both within the voltage zero-crossing range.

According to the control device of the relay in the embodiment of the present invention, the microprocessor obtains the on-delay time ta and The turn-off delay time is tb, and when the voltage of the power supply grid is judged to cross zero according to the voltage detection signal, the microprocessor outputs the turn-on control signal to the relay control circuit after delaying ta to control the relay to turn on at the next voltage zero-crossing after ta or After a delay of tb, a turn-off control signal is output to the relay control circuit to control the relay to turn off at the next voltage zero-crossing after tb. That is to say, the ta time is delayed when the voltage crosses zero for the first time. At this time, the control signal is output, and the relay will actually turn on after a delay of t11, because the voltage value corresponding to the time point of ta+t11 is within the zero-crossing voltage range. Then the actual turn-on time of the relay is carried out within the zero-crossing voltage range. Similarly, the turn-off time is also carried out within the voltage zero-crossing range, so as to realize the zero-crossing turn-on or turn-off of the relay, which makes the relay's turn-on process and turn-off The process is carried out in the zero-crossing voltage range, which can not only improve the service life of the relay, improve the stability and reliability of the circuit, but also avoid interference to the power supply grid and improve the stability of the power supply grid.

According to an embodiment of the present invention, a relay detection circuit is further included, the relay detection circuit is used to detect the opening and closing conditions of the relay, and the microprocessor includes a first timer, the microprocessor When the turn-on control signal is output to the relay control circuit, the first timer is controlled to start timing, and when the relay detection circuit detects that the relay is fully turned on, the microprocessor controls the first timer A timer ends timing, wherein the timing time of the first timer is the mechanical turn-on delay time t11 of the relay.

According to an embodiment of the present invention, the microprocessor further includes a second timer, and when the microprocessor outputs the shutdown control signal to the relay control circuit, the microprocessor controls the second timer to start timing , and when the relay detection circuit detects that the relay is completely turned off, the microprocessor controls the second timer to end the timing, wherein the timing of the second timer is the mechanical Turn off delay time t21.

Wherein, the ta is equal to mT-t11, the tb is equal to mT-t21, and m is a positive integer. In this way, ta+t11 is equal to mT, and tb+t11 is equal to mT, so that the relay is turned on or off at the zero-crossing point, and the loss of the relay can be minimized.

According to an embodiment of the present invention, when the voltage detection circuit detects that the voltage of the power supply grid is less than or equal to a preset voltage, the microprocessor determines that the voltage of the power supply grid crosses zero according to the voltage detection signal.

In addition, an embodiment of the present invention also provides an induction cooker, which includes the above-mentioned control device for the relay.

In the induction cooker of the embodiment of the present invention, when the relay is controlled to be turned on or off by the control device of the relay, the turn-on process and the turn-off process of the relay can be performed at zero voltage, which can not only improve the service life of the relay, but also improve the stability and reliability of the circuit. It can also avoid interference to the power supply grid and improve the stability of the power supply grid.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a flowchart of a method for controlling a relay according to an embodiment of the present invention;

FIG. 2A is a schematic diagram of obtaining the turn-on delay time ta or turn-off delay time tb of the relay according to an embodiment of the present invention; and

FIG. 2B is a schematic block diagram of a control device of a relay according to an embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials. Additionally, structures described below in which a first feature is "on" a second feature may include embodiments in which the first and second features are formed in direct contact, or may include additional features formed between the first and second features example, such that the first and second features may not be in direct contact.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a mechanical connection or an electrical connection, or two The internal communication between the elements may be directly connected or indirectly connected through an intermediate medium, and those of ordinary skill in the art can understand the specific meanings of the above terms according to specific circumstances.

The following describes a method for controlling a relay, a device for controlling a relay, and an induction cooker having the device for controlling a relay according to embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a flowchart of a control method of a relay according to an embodiment of the present invention. As shown in Figure 1, the control method of the relay includes the following steps:

S1, obtain the mechanical turn-on delay time t11 and the mechanical turn-off delay time t21 of the relay.

According to an embodiment of the present invention, acquiring the mechanical turn-on delay time t11 of the relay specifically includes: when outputting the turn-on control signal to the relay, controlling the first timer to start timing, and detecting the turn-on condition of the relay; When it is fully turned on, the first timer is controlled to end the time, wherein the time of the first timer is the mechanical turn-on delay time t11 of the relay.

Specifically, the microprocessor starts to work after power-on, and when the microprocessor outputs the turn-on control signal to the relay, the first timer starts timing; when it is detected that the relay is fully turned on, the interrupt signal is input to the microprocessor, and the micro- The processor generates an interrupt, the first timer ends, and the time from the microprocessor sending the turn-on control signal to the complete turn-on of the relay, that is, the time counted by the first timer is the actual mechanical turn-on delay time t11 of the relay, and then t11 is stored in the relay. in memory.

Among them, if there are multiple relays in the circuit, such as the circuit of the induction cooker, the mechanical turn-on delay time of each relay is obtained according to the above steps, and the mechanical turn-on delay times of the multiple relays t11, t12, t13, ... ..., t1n is stored in the memory, n is an integer greater than 1.

Similarly, obtaining the mechanical turn-off delay time t21 of the relay specifically includes: when the turn-off control signal is output to the relay, controlling the second timer to start timing, and detecting the turn-off condition of the relay; when it is detected that the relay is completely turned off When it is turned off, the second timer is controlled to end the time, wherein the time of the second timer is the mechanical turn-off delay time t21 of the relay.

Specifically, after obtaining the mechanical turn-on delay time t11 of the relay, the microprocessor outputs a turn-off control signal to the relay, and the second timer starts timing; when it is detected that the relay is completely turned off, the interrupt signal is input to the microprocessor The microprocessor generates an interrupt, the second timer ends, the time from the microprocessor sending the shutdown control signal to the complete shutdown of the relay, that is, the time counted by the second timer is the actual mechanical shutdown delay time t21 of the relay , then store t21 in memory.

Wherein, if there are multiple relays in the circuit, such as the circuit of an induction cooker, the mechanical turn-off delay time of each relay is obtained according to the above steps, and the mechanical turn-off delay times t21, t22, and t23 of the multiple relays are calculated. , ..., t2n are stored in the memory, and n is an integer greater than 1.

S2, according to the zero-voltage period T of the power supply grid and the mechanical turn-on delay time t11 and the mechanical turn-off delay time t21 of the relay, the turn-on delay time ta and the turn-off delay time tb of the relay are obtained.

S3, when the voltage of the power supply grid crosses zero, output the turn-on control signal after a delay of ta to control the relay to turn on or output a turn-off control signal after a delay of tb to control the relay to turn off, where the two time points t11+ta and t21+tb The corresponding voltage values are all within the voltage zero-crossing range.

According to an embodiment of the present invention, the above-mentioned relay control method further includes: detecting the voltage of the power supply grid, and judging that the voltage of the power supply grid crosses zero when the voltage of the power supply grid is less than or equal to a preset voltage. That is to say, the voltage of the power supply grid can be detected by the voltage detection circuit, and the generated voltage detection signal can be sent to the microprocessor. When the voltage detection circuit detects that the voltage of the power supply grid is less than or equal to the preset voltage U0, the microcomputer The processor judges that the voltage of the power supply grid crosses zero according to the voltage detection signal at this time. As shown in Figure 2A, the voltage between the U0 points on both sides near the zero point is considered to be within the zero-crossing range.

The zero-voltage cycle time of the power supply grid can be defined as T. According to an embodiment of the present invention, the on-delay time ta=mT-t11 of the relay is recorded, where m is a positive integer. When m=1, the turn-on delay times of the multiple relays are T-t11, T-t12, T-t13, ..., T-t1n, respectively. In the same way, the turn-off delay time of the relay tb=mT-t21, when m=1, the turn-on delay time of multiple relays are T-t21, T-t22, T-t23,..., T-t2n .

Specifically, as shown in Fig. 2A, when the voltage waveform of the power supply grid is an alternating current waveform, and when m=1, ta=T-t11, so that the on-delay time ta=T-t11 of the relay can be obtained. When the zero-crossing point is detected , after the delay ta, the turn-on control signal is output to the relay, and the relay itself will actually turn on after a delay of t11, that is, it is turned on at the zero-crossing voltage point at time T; in the same way, the turn-off delay time of the relay can be obtained tb=T- t21, when the zero-crossing point is detected, the turn-off control signal is output to the relay after a delay of tb1, and the relay itself will actually turn off after a delay of t21, that is, it is turned off at the zero-crossing voltage point at time T. This can ensure that the actual opening or actual closing of the relay is carried out at zero voltage. Wherein, if the voltage waveform of the power supply grid is a direct current waveform, the turn-on delay time and the turn-off delay time of the relay can also be obtained.

Therefore, the control method of the relay in the embodiment of the present invention can obtain the different mechanical on-delay time and mechanical off-delay time of each relay in the circuit of the induction cooker, and then calculate the on-delay time and off-delay time of each relay. With time, it can finally ensure that the relay is turned on and off at zero voltage, so as to improve the service life of the relay and the stability of the power supply grid.

According to the control method of the relay according to the embodiment of the present invention, the mechanical turn-on delay time t11 and the mechanical turn-off delay time t21 of the relay are first obtained, and then the mechanical turn-on delay time t11 and the mechanical turn-off delay time t11 of the relay are obtained according to the zero voltage period T of the power supply grid and the mechanical turn-on delay time t11 of the relay. The turn-off delay time t21 obtains the turn-on delay time ta and the turn-off delay time tb of the relay. Finally, when the voltage of the power supply grid crosses zero, the turn-on control signal is output after the delay ta to control the next relay after ta. Turn on when the voltage crosses zero or output a turn-off control signal after delaying tb to control the relay to turn off at the next zero-crossing point after tb. That is to say, the ta time is delayed when the voltage crosses zero for the first time. At this time, the control signal is output, and the relay will actually turn on after a delay of t11, because the voltage value corresponding to the time point of ta+t11 is within the zero-crossing voltage range. Then the actual turn-on time of the relay is performed within the zero-crossing voltage range. Similarly, the turn-off time is also performed within the voltage zero-crossing range, so as to realize the zero-crossing turn-on or turn-off of the relay, which can not only improve the service life of the relay, To improve the stability and reliability of the circuit, it can also avoid interference to the power supply grid and improve the stability of the power supply grid.

FIG. 2B is a schematic block diagram of a control device of a relay according to an embodiment of the present invention. As shown in FIG. 2B , the control device of the relay includes a voltage detection circuit 10 , a relay control circuit 20 and a microprocessor 30 .

The voltage detection circuit 10 is used to detect the voltage of the power supply grid to generate a voltage detection signal, the relay control circuit 20 is used to control the opening or closing of the relay 100, and the microprocessor 30 is respectively connected with the voltage detection circuit 10 and the relay control circuit 20, The microprocessor 30 obtains the turn-on delay time ta and the turn-off delay time tb of the relay 100 according to the zero-voltage period T of the power supply grid and the obtained mechanical turn-on delay time t11 and mechanical turn-off delay time t21 of the relay 100, and When judging that the voltage of the power supply grid crosses zero according to the voltage detection signal, the microprocessor 30 delays the ta and then outputs a turn-on control signal to the relay control circuit 20 to control the relay 100 to turn on or output the turn-off control after delaying the tb The signal is sent to the relay control circuit 20 to control the relay 100 to be turned off, wherein the voltage values corresponding to the two time points t11+ta and t21+tb are both within the voltage zero-crossing range.

According to an embodiment of the present invention, when the voltage detection circuit 10 detects that the voltage of the power supply grid is less than or equal to the preset voltage U0, the microprocessor 30 determines that the voltage of the power supply grid crosses zero according to the voltage detection signal.

According to an embodiment of the present invention, as shown in FIG. 2B , the above-mentioned control device for the relay further includes a relay detection circuit 40 , the relay detection circuit 40 is used to detect the opening and closing conditions of the relay 100 , and the microprocessor 30 includes The first timer 301, when the microprocessor 30 outputs the turn-on control signal to the relay control circuit 20, controls the first timer 301 to start timing, and when the relay detection circuit 40 detects that the relay 100 is fully turned on, the microprocessor 30 controls the first timer 301 to time out, wherein the time of the first timer 301 is the mechanical turn-on delay time t11 of the relay 100 .

In addition, the microprocessor 30 further includes a second timer 302. When the microprocessor 30 outputs the shut-off control signal to the relay control circuit 20, the microprocessor 30 controls the second timer 302 to start timing, and detects when the relay detection circuit 40 detects When the relay 100 is completely turned off, the microprocessor 30 controls the second timer 302 to time out, wherein the time of the second timer 302 is the mechanical turn-off delay time t21 of the relay 100 .

As shown in FIG. 2B , the above-mentioned control device for the relay also includes a memory 50 for storing the mechanical turn-on delay time t11 and the mechanical turn-off delay time t21 of the relay. , then obtain the mechanical turn-on delay time of each relay respectively, and store the mechanical turn-on delay times t11, t12, t13, ..., t1n of multiple relays in the memory 50, where n is an integer greater than 1. Likewise, the mechanical turn-off delay time of each relay is obtained respectively, and the mechanical turn-off delay times t21 , t22 , t23 , . . . , t2n of the plurality of relays are stored in the memory 50 .

In the embodiment of the present invention, the ta is equal to T-t11, and the tb is equal to T-t21. Since the t1n and t2n of each relay are stored in the memory 50, the delay time of turning on or off each relay only needs to be detected once, and the next turn on or off can be calculated according to the originally stored t1n and t2n Get ta and tb, or you can directly store the ta and tb of each relay.

According to the control device of the relay in the embodiment of the present invention, the microprocessor obtains the on-delay time ta and The turn-off delay time is tb, and when the voltage of the power supply grid is judged to cross zero according to the voltage detection signal, the microprocessor outputs the turn-on control signal to the relay control circuit after delaying ta to control the relay to turn on at the next voltage zero-crossing after ta or After a delay of tb, a turn-off control signal is output to the relay control circuit to control the relay to turn off at the next voltage zero-crossing after tb. That is to say, the ta time is delayed when the voltage crosses zero for the first time. At this time, the control signal is output, and the relay will actually turn on after a delay of t11, because the voltage value corresponding to the time point of ta+t11 is within the zero-crossing voltage range. Then the actual turn-on time of the relay is carried out within the zero-crossing voltage range. Similarly, the turn-off time is also carried out within the voltage zero-crossing range, so as to realize the zero-crossing turn-on or turn-off of the relay, which makes the relay's turn-on process and turn-off The process is carried out in the zero-crossing voltage range, which can not only improve the service life of the relay, improve the stability and reliability of the circuit, but also avoid interference to the power supply grid and improve the stability of the power supply grid.

In addition, an embodiment of the present invention also provides an induction cooker, which includes the above-mentioned control device for the relay.

In the induction cooker of the embodiment of the present invention, when the relay is controlled to be turned on or off by the control device of the relay, the turn-on process and the turn-off process of the relay can be performed at zero voltage, which can not only improve the service life of the relay, but also improve the stability and reliability of the circuit. It can also avoid interference to the power supply grid and improve the stability of the power supply grid.

Any description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a specified logical function or step of the process , and the scope of the preferred embodiments of the invention includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present invention belong.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use with, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus, or apparatus) or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of the present invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms 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.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. a control method of a relay, is characterized in that, comprises the following steps: Obtain the mechanical turn-on delay time t11 of the relay in the circuit of the induction cooker, and obtain the mechanical turn-off delay time t21 of the relay after obtaining the mechanical turn-on delay time t11; According to the zero-voltage period T of the power supply grid and the mechanical turn-on delay time t11 and mechanical turn-off delay time t21 of the relay, the turn-on delay time ta and the turn-off delay time tb of the relay are obtained; When the voltage of the power supply grid crosses zero, output a turn-on control signal after delaying the ta to control the relay to turn on or output a turn-off control signal after delaying the tb to control the relay to turn off, wherein t11+ta and The voltage values corresponding to the two time points t21+tb are all within the voltage zero-crossing range, Among them, obtaining the mechanical turn-on delay time t11 of the relay specifically includes: When outputting the turn-on control signal to the relay, control the first timer to start timing, and detect the turn-on condition of the relay; When it is detected that the relay is fully turned on, the first timer is controlled to end the time, wherein the time of the first timer is the mechanical turn-on delay time t11 of the relay, Obtaining the mechanical turn-off delay time t21 of the relay specifically includes: When outputting the shut-off control signal to the relay, control a second timer to start timing, and detect the shut-off condition of the relay; When it is detected that the relay is completely turned off, the second timer is controlled to end the time, wherein the time of the second timer is the mechanical turn-off delay time t21 of the relay; Wherein, when the number of the relays is greater than 1, the mechanical turn-on delay time t1n and the mechanical turn-off delay time t2n of each of the relays are obtained respectively. 2 . The method for controlling a relay according to claim 1 , wherein the ta is equal to mT-t11, the tb is equal to mT-t21, and m is a positive integer. 3 . 3. The control method of the relay as claimed in claim 1, is characterized in that, also comprises: The voltage of the power supply grid is detected, and when the voltage of the power supply grid is less than or equal to a preset voltage, it is determined that the voltage of the power supply grid crosses zero. 4. A control device for a relay, characterized in that, comprising: a voltage detection circuit, the voltage detection circuit is used to detect the voltage of the power supply grid to generate a voltage detection signal; a relay control circuit, the relay control circuit is used to control the opening or closing of the relay in the circuit of the induction cooker; a microprocessor, which is respectively connected to the voltage detection circuit and the relay control circuit, and the microprocessor obtains the mechanical turn-on delay of the relay first according to the zero-voltage period T of the power supply grid Time t11 and then obtain the mechanical turn-off delay time t21 to obtain the turn-on delay time ta and turn-off delay time tb of the relay, and judge that when the voltage of the power supply grid crosses zero according to the voltage detection signal, the The microprocessor delays the ta and outputs an on control signal to the relay control circuit to control the relay to be turned on or delays the tb and outputs an off control signal to the relay control circuit to control the relay to turn off, wherein The voltage values corresponding to the two time points t11+ta and t21+tb are both within the voltage zero-crossing range, Wherein, the control device of the relay further includes a relay detection circuit, the relay detection circuit is used to detect the opening and closing of the relay, and the microprocessor includes a first timer, and the microprocessor When the device outputs the turn-on control signal to the relay control circuit, it controls the first timer to start timing, and when the relay detection circuit detects that the relay is fully turned on, the microprocessor controls the The timing of the first timer ends, wherein the timing time of the first timer is the mechanical turn-on delay time t11 of the relay, The microprocessor also includes a second timer, when the microprocessor outputs the shutdown control signal to the relay control circuit, controls the second timer to start timing, and executes the timer in the relay detection circuit. When it is detected that the relay is completely turned off, the microprocessor controls the second timer to end the time, wherein the time of the second timer is the mechanical turn-off delay time t21 of the relay; Wherein, when the number of the relays is greater than 1, the mechanical turn-on delay time t1n and the mechanical turn-off delay time t2n of each of the relays are obtained respectively. 5. The relay control device according to claim 4, wherein the ta is equal to mT-t11, the tb is equal to mT-t21, and m is a positive integer. 6 . The control device for a relay according to claim 4 , wherein when the voltage detection circuit detects that the voltage of the power supply grid is less than or equal to a preset voltage, the microprocessor detects the signal according to the voltage. 7 . It is judged that the voltage of the power supply grid crosses zero. 7. An induction cooker, characterized in that it comprises the control device of the relay according to any one of claims 4-6.

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