Self-adaptive adjusting circuit and method for cycle period based on double delay relays

Abstract

The invention provides a cycle period self-adaptive adjusting circuit and method based on double delay relays. The self-adaptive adjusting circuit takes two time-delay relays as a core to construct interlocking control logic and form a closed-loop trigger mechanism; and a cycle period control signal is output through a low-cost circuit. The self-adaptive adjusting method comprises the following steps: calculating the delay time adjusting quantity of a delay relay in real time according to dynamically monitored load current and environment temperature based on preset fuzzy logic control or feedback control, and determining the delay time of the delay relay in combination with a target output frequency; and according to the delay time of the delay relay, an adjustable rheostat arranged in the delay adjustment unit is automatically adjusted, so that the frequency and the duty ratio of the cycle period are adaptively adjusted. In addition, the accuracy of intelligent control is improved through a temperature compensation mechanism; and through an anomaly detection and protection mechanism, the reliability of intelligent control is improved.

Description

Technical Field

[0001] The present invention belongs to the field of time-delay relays. More specifically, the present invention discloses an adaptive adjustment circuit and method for the cycle period based on a dual time-delay relay. Background Art

[0002] In the fields of industrial automation and electrical control, time-delay relays are widely used in scenarios such as equipment start-stop and cycle period control. In the prior art, there are mainly two types of solutions for implementing cycle control: The first is to use a single dedicated time-delay relay with cycle control function. Although the dedicated cycle control relay simplifies the circuit design, its customized characteristics result in high cost; and its closing time and opening time usually cannot be adjusted independently. That is to say, it only supports fixed output frequency and duty cycle, and it is difficult to meet the scenario requirements of differential time setting such as gradient control. In addition, such relays lack the ability of adaptive adjustment and cannot dynamically optimize the cycle parameters according to load fluctuations or ambient temperature changes, resulting in low energy efficiency or the risk of equipment overload.

[0003] The second is to design complex timing logic through a programmable logic controller (PLC) or a microprocessor. Using a PLC or a microcontroller to achieve high-precision control, but it relies on software programming and complex peripheral circuits, with high cost and high maintenance threshold. In a harsh industrial environment, the anti-interference ability of electronic components is insufficient, and timing disorders are easily caused by electromagnetic noise or temperature drift.

[0004] The existing cycle control technologies have significant limitations in terms of high cost, low flexibility, lack of adaptive ability and insufficient scalability. Therefore, there is an urgent need for a low-cost, highly reliable solution that supports intelligent adjustment. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide an adaptive adjustment circuit and method for the cycle period based on a dual time-delay relay. The adaptive adjustment circuit takes two time-delay relays as the core, constructs an interlock control logic, forms a closed-loop trigger mechanism, and outputs a cycle period control signal through a low-cost circuit. The adaptive adjustment method dynamically monitors the load current and ambient temperature, and based on the preset fuzzy logic control or feedback control, calculates the adjustment amount of the delay time of the time-delay relay in real time, and then determines the delay time of the time-delay relay in combination with the target output frequency; according to the delay time of the time-delay relay, automatically adjusts the adjustable resistor set by the delay adjustment unit to achieve adaptive adjustment of the frequency and duty cycle of the cycle period. In addition, the accuracy of intelligent control is improved through a temperature compensation mechanism; the reliability of intelligent control is improved through an abnormal detection and protection mechanism.

[0006] To achieve the above object, a first aspect of the present invention provides an adaptive adjustment circuit for the cycle period based on a double-delay relay, and the circuit includes: A processor, a cycle period output module, an electrical parameter detection module, and a delay adjustment module; The cycle period output module includes a first delay relay and a second delay relay; The normally closed switch of the first delay relay is connected to the output control terminal, the normally open switch of the first delay relay is connected to the control coil of the second delay relay, and the normally closed switch of the second delay relay is connected to the control coil of the first delay relay; The electrical parameter detection module is used to detect the electrical parameters of the adjustment circuit, at least including the current value of the output control terminal and the temperature value of the adjustment circuit; The delay adjustment module is used to adjust the trigger delay time of the first delay relay and the second delay relay; The processor collects the electrical parameters of the circuit through the electrical parameter detection module, and adjusts the trigger delay time of the delay relay through the delay adjustment module.

[0007] In this solution, the first delay relay further includes a homologous single-pole double-throw switch, specifically: The common terminal of the homologous single-pole double-throw switch is connected to the positive pole of the output control power supply; The normally closed terminal of the homologous single-pole double-throw switch is connected to the output control terminal and then to the negative pole of the output control power supply; The normally open terminal of the homologous single-pole double-throw switch is connected to the control coil of the second delay relay and then to the negative pole of the output control power supply.

[0008] In this solution, the first delay relay further includes a heterologous double-pole double-throw switch, specifically: The normally closed switch of the heterologous double-pole double-throw switch includes a first terminal and a second terminal; The first terminal is connected to the positive pole of the output control power supply; The second terminal is connected to the output control terminal and then to the negative pole of the output control power supply; The normally open switch of the heterologous double-pole double-throw switch includes a third terminal and a fourth terminal; The third terminal is connected to the positive pole of the coil control power supply; The fourth terminal is connected to the control coil of the second delay relay and then to the negative pole of the output control power supply.

[0009] In this solution, the delay adjustment module specifically includes: A first delay adjustment unit and a second delay adjustment unit; Both the first delay adjustment unit and the second delay adjustment unit are provided with adjustable variable resistors for adjusting the trigger delay time of the delay relay; The first delay adjustment unit is used to adjust the trigger delay time of the first delay relay; The second delay adjustment unit is used to adjust the trigger delay time of the second delay relay.

[0010] A second aspect of the present invention further provides an adaptive adjustment method for the cycle period based on a double delay relay, which is applied to the adaptive adjustment circuit for the cycle period based on a double delay relay described above. The method includes: Obtain the first current information of the output control terminal and the first temperature information of the adjustment circuit; Estimate a preset first adjustment amount algorithm, and obtain a first time adjustment amount and a second time adjustment amount according to the first current information and the first temperature information; Obtain the first time information of the first delay relay and the second time information of the second delay relay; Update the first time information according to the first time adjustment amount, and update the second time information according to the second time adjustment amount; Obtain the target duty cycle information according to the first time information and the second time information; Based on the preset target frequency information, adjust the first time information and the second time information according to the target duty cycle information; Adjust the first delay adjustment unit of the delay adjustment module according to the first time information; Adjust the second delay adjustment unit of the delay adjustment module according to the second time information.

[0011] In this solution, it further includes that the first adjustment amount algorithm is a fuzzy logic control algorithm, specifically: Obtain the rated current information and the rated temperature information; Based on the rated current information, obtain a five-level current interval set; Based on the rated temperature information, obtain a five-level temperature interval set; Based on the five-level current interval set, obtain a current adjustment level according to the first current information; Based on the five-level temperature interval set, obtain a temperature adjustment level according to the first temperature information; According to the current adjustment level and the temperature adjustment level, look up a preset adjustment correspondence table to obtain the first time adjustment amount and the second time adjustment amount.

[0012] In this solution, it further includes that the first adjustment amount algorithm is a first feedback control algorithm, specifically: Obtain the rated current information and the rated temperature information; Calculate the difference between the first current information and the rated current information to obtain the current deviation information; Calculate the difference between the first temperature information and the rated temperature information to obtain the temperature deviation information; According to the current deviation information and the temperature deviation information, obtain the proportional control quantity according to the proportional weight value; According to the integral value of the current deviation information and the integral value of the temperature deviation information, obtain the integral control quantity according to the integral weight value; According to the proportional control quantity and the integral control quantity, obtain the feedback control quantity for obtaining the first time adjustment quantity and the second time adjustment quantity.

[0013] In this solution, it also includes: Based on the discrete Fourier transform, obtain the current fluctuation frequency information according to the first current information; Judge whether the current fluctuation frequency information is greater than a preset first fluctuation frequency threshold; If so, adjust the integral weight value downward; If not, judge whether the current fluctuation frequency information is less than a preset second fluctuation frequency threshold; If so, adjust the integral weight value upward.

[0014] In this solution, it also includes a temperature compensation mechanism, specifically: When the first temperature information is greater than a preset first temperature threshold, trigger temperature compensation; Judge whether the first temperature information is lower than a preset second temperature threshold; If so, use the preset piecewise linear interpolation method to perform interpolation compensation on the first time adjustment quantity and the second time adjustment quantity; If not, adjust the first time adjustment quantity and the second time adjustment quantity according to the preset dynamic compensation relation formula.

[0015] In this solution, it also includes: If the first current information is greater than the overcurrent threshold or the first temperature information is greater than the overtemperature threshold, enter the protection mode; Set the first time information to the minimum reference value; Set the second time information to the maximum reference value; If the duration of the protection mode exceeds a preset safety time threshold; Then disconnect the output control power supply and send a fault code.

[0016] The present invention provides an adaptive adjustment circuit and method for the cycle period based on a double-delay relay. The adaptive adjustment circuit takes two delay relays as the core, constructs an interlock control logic, forms a closed-loop trigger mechanism, and outputs a cycle period control signal through a low-cost circuit. The adaptive adjustment method dynamically monitors the load current and ambient temperature, and based on the preset fuzzy logic control or feedback control, calculates the adjustment amount of the delay time of the delay relay in real time, and then determines the delay time of the delay relay in combination with the target output frequency. According to the delay time of the delay relay, the adjustable resistor set by the delay adjustment unit is automatically adjusted to achieve adaptive adjustment of the frequency and duty cycle of the cycle period. In addition, the accuracy of intelligent control is improved through a temperature compensation mechanism, and the reliability of intelligent control is improved through an abnormal detection and protection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope.

[0018] Figure 1 Fig. shows a schematic structural diagram of an adaptive adjustment circuit for the cycle period based on a double-delay relay; Figure 2 Fig. shows an operating logic timing diagram of the adaptive adjustment circuit for the cycle period based on a double-delay relay provided by an embodiment of the present invention; Figure 3 Fig. shows a schematic circuit connection diagram of a homologous single-pole double-throw switch provided by an embodiment of the present invention; Figure 4 Fig. shows a schematic circuit connection diagram of a heterologous double-pole double-throw switch provided by an embodiment of the present invention; Figure 5 Fig. shows a schematic diagram of an adaptive adjustment method for the cycle period based on a double-delay relay; Figure 6 Fig. shows an execution flowchart of the fuzzy logic control algorithm provided by an embodiment of the present invention; Figure 7 Fig. shows an execution flowchart of the feedback control algorithm provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the scope of protection of the present invention.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the embodiments of the present invention.

[0021] The "first", "second" and similar words used in the embodiments of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "a", "an" or "the" do not denote a quantity limitation either, but mean that there is at least one. Similarly, words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the methods of the embodiments of the present invention do not necessarily have to be carried out precisely in order. On the contrary, they can be carried out in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or one or several steps can be removed from these processes.

[0022] Please refer to Figure 1 , Figure 1 which shows a schematic structural diagram of an adaptive adjustment circuit for the cycle period based on a double-delay relay.

[0023] As Figure 1 shown, in the first aspect of the present invention, the adaptive adjustment circuit 10 for the cycle period based on a double-delay relay is disclosed, and the circuit includes: a processor 101, a cycle period output module 102, an electrical parameter detection module 103 and a delay adjustment module 104; The cycle period output module includes a first delay relay and a second delay relay; The normally closed switch of the first delay relay is connected to the output control end, the normally open switch of the first delay relay is connected to the control coil of the second delay relay, and the normally closed switch of the second delay relay is connected to the control coil of the first delay relay; The electrical parameter detection module is used to detect the electrical parameters of the adjustment circuit, at least including the current value at the output control end and the temperature value of the adjustment circuit; The delay adjustment module is used to adjust the trigger delay time of the first delay relay and the second delay relay; The processor collects the electrical parameters of the circuit through the electrical parameter detection module and adjusts the trigger delay time of the delay relay through the delay adjustment module.

[0024] It should be noted that after the power-on startup of the adaptive adjustment circuit for the cycle period based on the dual delay relays, first, the processor configures the trigger delay time of the delay relay through the delay adjustment module, so that the cycle period output module outputs a cycle period control signal. Then, the processor detects the electrical parameters of the adaptive adjustment circuit through the electrical parameter detection module; among them, the electrical parameters at least include the output current value, that is, the current value at the output control terminal, and the temperature value of the adaptive adjustment circuit. Finally, the processor adjusts the configuration parameters of the delay adjustment module to achieve the adjustment of the cycle period control signal.

[0025] As Figure 2 shown, Figure 2 It shows the operation logic timing diagram of the adaptive adjustment circuit for the cycle period based on the dual delay relays provided by the embodiment of the present invention. K1 represents the working state of the first delay relay, and K2 represents the working state of the second delay relay; NC indicates that the normally closed switch of the delay relay is in the conducting state, NO indicates that the normally open switch of the delay relay is in the conducting state, and S indicates that the delay relay is in the power-off switching state. L1 represents the conducting state of the control coil of the first delay relay, L2 represents the conducting state of the control coil of the second delay relay, and OUT represents the conducting state of the output control terminal; the low level indicates the power-off state, and the high level indicates the power-on state. T1 represents the trigger delay time of the first delay relay, and T2 represents the trigger delay time of the second delay relay, where the trigger delay time represents the duration between the power-on of the delay relay and the completion of the switching action of the switch; △t1 represents the switching delay time of the first delay relay, and △t2 represents the switching delay time of the second delay relay, where the switching delay time represents the duration between the power-off of the delay relay and the completion of the switching. The operation logic of the cycle period based on the dual delay relays includes 4 stages: P_OFF power-off stage, P_S startup stage, P_L output low level stage, and P_H output high level stage.

[0026] P_OFF power-off stage: K1 and K2 are in the state where the normally closed switches are conducting, and L1, L2, and OUT are not powered on.

[0027] P_S startup stage: After power-on, K1 is in the NC state. At this time, the output control power supply supplies power to OUT through K1, so OUT is powered on and L2 is powered off; K2 is in the NC state, and the output control power supply supplies power to L1 through K2, so L1 is powered on and K1 starts the delay trigger; After a time T1, the first delay relay triggers a power-on switching operation. K1 is in the NO state. The output control power supply supplies power to L2 through K1, so OUT is powered off and L2 is powered on, and K2 starts a delayed trigger. Since the second delay relay needs to be triggered with a delay, K2 is still in the NC state. The output control power supply supplies power to L1 through K2, so L1 is powered on. Enter the P_L stage.

[0028] The P_L output low-level stage, that is, the low-level stage of the cycle period: After a time T2, the second delay relay triggers a power-on switching operation. K2 is in the NO state, so L1 is powered off. Since the first delay relay has a power-off switching delay, at this time, K1 is still in the NO state, so L2 is powered on and OUT is powered off. After a time Δt1, K1 switches to the NC state, so OUT is powered on and L2 is powered off. Since the second delay relay has a power-off switching delay, K2 is still in the NO state, that is, L1 is powered off. Enter the P_H stage.

[0029] The P_H output high-level stage, that is, the high-level stage of the cycle period: After a time Δt2, K2 switches to the NC state, so L1 is powered on and K1 starts a delayed trigger. K1 remains in the NC state, so OUT is powered on and L2 is powered off. After a time T1, the first delay relay triggers a power-on switching operation. K1 switches to the NO state, so OUT is powered off and L2 is powered on, and K2 starts a delayed trigger. Since the second delay relay needs to be triggered with a delay, K2 is still in the NC state. The output control power supply supplies power to L1 through K2, so L1 is powered on. Enter the P_L stage.

[0030] In summary, after the P_S start-up stage, the double delay relays cycle and switch between the P_L output low-level stage and the P_H output high-level stage to achieve the output of the cycle period control signal. Among them, the duration of the low level of the cycle period control signal is T2 + Δt1; the duration of the high level of the cycle period control signal is T1 + Δt2. The duty cycle calculation formula is: .

[0031] Please refer to Figure 3 , Figure 3 which shows the circuit connection schematic diagram of the homologous single-pole double-throw switch provided by the embodiment of the present invention.

[0032] According to the embodiment of the present invention, as Figure 3 shown, it further includes that the first delay relay includes a homologous single-pole double-throw switch, specifically: The common terminal Dcom of the homologous single-pole double-throw switch K301 is connected to the positive pole L of the output control power supply; The normally-closed terminal Dnc of the homologous single-pole double-throw switch K301 is connected to the output control terminal OUT, and then connected to the negative pole N of the output control power supply; The normally-open terminal Dno of the homologous single-pole double-throw switch K301 is connected to the control coil L302 of the second delay relay, and then connected to the negative pole N of the output control power supply.

[0033] It should be noted that the switch K302 of the second delay relay and the control coil L301 of the first delay relay. When the voltage of the output control signal is the same as the control voltage of the delay relay, the switch of the first delay relay can be a homologous single-pole double-throw switch. That is to say, the output control power supply supplies power to both the delay relay and the output control terminal at the same time.

[0034] Please refer to Figure 4 , Figure 4 which shows the circuit connection schematic diagram of the heterologous double-pole double-throw switch provided by the embodiment of the present invention.

[0035] According to the embodiment of the present invention, as Figure 4 shown, it further includes that the first delay relay includes a heterologous double-pole double-throw switch, specifically: The normally-closed switch of the heterologous double-pole double-throw switch K401 includes a first terminal D1 and a second terminal D2; The first terminal D1 is connected to the positive pole L of the output control power supply; The second terminal D2 is connected to the output control terminal OUT, and then connected to the negative pole N of the output control power supply; The normally-open switch of the heterologous double-pole double-throw switch K401 includes a third terminal D3 and a fourth terminal D4; The third terminal D3 is connected to the positive pole L` of the coil control power supply; The fourth terminal D4 is connected to the control coil L402 of the second delay relay, and then connected to the negative pole N` of the output control power supply.

[0036] It should be noted that the switch K402 of the second delay relay and the control coil L401 of the first delay relay. When the voltage of the output control signal is the same as the control voltage of the delay relay, the switch of the first delay relay can be a heterologous double-pole double-throw switch; that is to say, the relay control power supply and the output control power supply use different power supplies, so as to realize the control between different voltages. In practical applications, a low-voltage control high-voltage scheme is usually adopted. For example, a 12V DC voltage is used to supply power to the relay to control the output of 36V DC voltage or 220V AC voltage.

[0037] According to the embodiment of the present invention, the delay adjustment module specifically includes: A first delay adjustment unit and a second delay adjustment unit; Both the first delay adjustment unit and the second delay adjustment unit are provided with adjustable rheostats for adjusting the trigger delay time of the delay relay. The first delay adjustment unit is used to adjust the trigger delay time of the first delay relay. The second delay adjustment unit is used to adjust the trigger delay time of the second delay relay.

[0038] It should be noted that the delay adjustment module includes two delay adjustment units, which are respectively used to adjust the trigger delay times of the first delay relay and the second delay relay. The delay adjustment unit adjusts the digital adjustable rheostat to achieve the purpose of adjusting the trigger delay time. As an implementation method, an RCL delay circuit is formed by connecting a resistor in series with a coil and then connecting a capacitor in parallel to achieve the effect of adjusting the delay.

[0039] Please refer to Figure 5 , Figure 5 which shows a flowchart of an adaptive adjustment method for the cycle period based on a dual-delay relay.

[0040] As Figure 5 shown, in the second aspect of the present invention, the adaptive adjustment method for the cycle period based on the dual-delay relay is disclosed, and the method includes: S502, obtaining first current information of the output control end and first temperature information of the adjustment circuit; S504, estimating a preset first adjustment amount algorithm, and obtaining a first time adjustment amount and a second time adjustment amount according to the first current information and the first temperature information; S506, obtaining first time information of the first delay relay and second time information of the second delay relay; S508, updating the first time information according to the first time adjustment amount, and updating the second time information according to the second time adjustment amount; S510, obtaining target duty cycle information according to the first time information and the second time information; S512, based on preset target frequency information, adjusting the first time information and the second time information according to the target duty cycle information; S514, adjusting the first delay adjustment unit of the delay adjustment module according to the first time information; S516, adjusting the second delay adjustment unit of the delay adjustment module according to the second time information.

[0041] It should be noted that the first current information is the output current of the adjustment circuit, that is, the current value provided to the load; the first temperature information is the temperature value of the adjustment circuit; the first time adjustment amount is the adjustment amount of the trigger delay time of the first delay relay; the second time adjustment amount is the adjustment amount of the trigger delay time of the second delay relay; the first time information is the trigger delay time of the first delay relay; the second time information is the trigger delay time of the second delay relay; the target duty cycle information is the target duty cycle of the cycle period control signal; the target frequency information is the target frequency of the cycle period control signal.

[0042] In this embodiment, an adaptive adjustment process for the cycle period is provided. According to the electrical parameters of the adjustment circuit, the delay time of the delay relay is adaptively adjusted, so as to achieve the purpose of adjusting the frequency and duty cycle of the cycle period control signal. First, the current signal at the output control end is collected in real time through a Hall sensor, and the temperature of the adjustment circuit is measured through a temperature sensor or a thermistor circuit. Secondly, based on a preset fuzzy logic control algorithm or feedback control algorithm, according to the real-time value and rated value of the electrical parameters, the adjustment amount of the trigger delay time of the delay relay is calculated. Then, the trigger delay time of the delay relay is updated according to the adjustment amount of the trigger delay time, and based on the updated first time information and second time information, the target duty cycle of the cycle period control signal is calculated. Finally, according to the target frequency and target duty cycle of the cycle period control signal, the first time information and the second time information are adjusted again, and based on the adjusted first time information and second time information, the digital adjustable resistor in the delay adjustment unit is adjusted according to a preset communication instruction, so as to achieve the effect of adjusting the trigger delay time of the delay relay.

[0043] Please refer to Figure 6 , Figure 6 which shows the execution flowchart of the fuzzy logic control algorithm provided by the embodiment of the present invention.

[0044] In the embodiment of the present invention, as Figure 6 shown, it further includes that the first adjustment amount algorithm is a fuzzy logic control algorithm, specifically: S602, obtain the rated current information and the rated temperature information; S604, based on the rated current information, obtain a five-level current interval set; S606, based on the rated temperature information, obtain a five-level temperature interval set; S608, based on the five-level current interval set, obtain the current adjustment level according to the first current information; S610, based on the five-level temperature interval set, obtain the temperature adjustment level according to the first temperature information; S612. According to the current adjustment level and the temperature adjustment level, look up a preset adjustment correspondence table to obtain a first time adjustment amount and a second time adjustment amount.

[0045] It should be noted that the rated current information is the target output current value of the adjustment circuit; the rated temperature information is the target operating temperature value of the adjustment circuit; the five - level current interval set is 5 current intervals divided according to the rated current information; the five - level temperature interval set is 5 temperature intervals divided according to the rated temperature information.

[0046] As an implementation manner, this embodiment provides a fuzzy logic control algorithm for the first time adjustment amount and the second time adjustment amount. Specifically: Obtain the rated current information and the rated temperature information to respectively obtain a five - level current interval set and a five - level temperature interval set; Combine the first current information and the first temperature information to respectively obtain a current adjustment level and a temperature adjustment level; According to the current adjustment level and the temperature adjustment level, look up a preset adjustment correspondence table to obtain a first time adjustment amount and a second time adjustment amount.

[0047] In this embodiment, first, according to the rated current and the rated temperature, obtain the corresponding current interval set and temperature interval set. For example, the 1 - level interval is less than 70% of the rated value, the 2 - level interval is from 70% to 90% of the rated value, the 3 - level interval is from 90% to 110% of the rated value, the 4 - level interval is from 110% to 130% of the rated value, and the 5 - level interval is greater than 130% of the rated value. Then, check the first current information and the first temperature information to obtain the serial numbers of the corresponding intervals, denoted as the adjustment level. Finally, according to the current adjustment level and the temperature adjustment level, look up a preset adjustment correspondence table to obtain the adjustment ratio of the first time information and the adjustment ratio of the second time, and further determine the first time adjustment amount and the second time adjustment amount.

[0048] Please refer to Figure 7 , Figure 7 which shows the execution flowchart of the feedback control algorithm provided by the embodiment of the present invention.

[0049] In the embodiment of the present invention, as Figure 7 shown, it further includes that the first adjustment amount algorithm is a first feedback control algorithm, specifically: S702. Obtain the rated current information and the rated temperature information; S704. Calculate the difference between the first current information and the rated current information to obtain current deviation information; S706. Calculate the difference between the first temperature information and the rated temperature information to obtain temperature deviation information; S708. According to the current deviation information and the temperature deviation information, obtain a proportional control amount according to the proportional weight value; S710. Obtain an integral control quantity according to the integral value of the current deviation information and the integral value of the temperature deviation information according to the integral weight. S712. Obtain a feedback control quantity according to the proportional control quantity and the integral control quantity, for obtaining a first time adjustment quantity and a second time adjustment quantity.

[0050] It should be noted that, as an implementation manner, this embodiment provides a first feedback control algorithm for a first time adjustment quantity and a second time adjustment quantity, specifically: obtain rated current information and rated temperature information, respectively calculate the differences from the first current information and the first temperature information to obtain current deviation information and temperature deviation information; obtain a proportional control quantity and an integral control quantity according to the current deviation information and the temperature deviation information for calculating a feedback control quantity; obtain a first time adjustment quantity and a second time adjustment quantity according to the feedback control quantity.

[0051] In this embodiment, a first time adjustment quantity and a second time adjustment quantity are obtained through a feedback control algorithm. First, calculate the difference between the real-time value and the rated value to obtain a deviation value. Then, calculate a proportional control quantity based on the deviation value and the proportional weight; calculate an integral control quantity based on the integral value of the deviation value and the integral weight. Finally, calculate the sum of the proportional control quantity and the integral weight to obtain a feedback control quantity; wherein, the feedback control quantity includes a first time adjustment quantity and a second time adjustment quantity.

[0052] In the embodiment of the present invention, it further includes: Based on the discrete Fourier transform, obtain current fluctuation frequency information according to the first current information; Judge whether the current fluctuation frequency information is greater than a preset first fluctuation frequency threshold; If so, downwardly adjust the integral weight; If not, judge whether the current fluctuation frequency information is less than a preset second fluctuation frequency threshold; If so, upwardly adjust the integral weight.

[0053] It should be noted that in this embodiment, an adaptive adjustment mechanism for the integral weight of a first feedback control algorithm is provided. First, based on the current value collected in real time and the discrete Fourier transform (DFT, by transforming the signal from the time domain to the frequency domain to study the spectral structure and variation law of the signal), the main frequency of the current fluctuation, that is, the current fluctuation frequency information, is obtained. Among them, if the main frequency of the current fluctuation is too high, it means that the current fluctuates frequently, which may be caused by overshoot of the feedback control; if the main frequency of the current fluctuation is too low, it means that the current fluctuation is too slow, and there is a risk of steady-state error superposition. Therefore, if the current fluctuation is greater than a preset first fluctuation frequency threshold, the integral weight is adjusted downward according to a preset adjustment relation to avoid overshoot; otherwise, it is judged whether the main frequency of the current fluctuation is less than a preset second fluctuation frequency threshold. If so, the integral weight is adjusted upward according to the preset adjustment relation to reduce the risk of steady-state error superposition. If the main frequency of the current fluctuation is within the range of the first fluctuation frequency threshold and the second fluctuation frequency threshold, no adjustment is required.

[0054] In the embodiment of the present invention, a temperature compensation mechanism is further included, specifically: When the first temperature information is greater than a preset first temperature threshold, temperature compensation is triggered; Judge whether the first temperature information is lower than a preset second temperature threshold; If so, the preset piecewise linear interpolation method is used to perform interpolation compensation on the first time adjustment amount and the second time adjustment amount; If not, the first time adjustment amount and the second time adjustment amount are adjusted according to a preset dynamic compensation relation.

[0055] It should be noted that the control coil of the delay relay is affected by temperature. As the temperature rises, the problem of inaccurate trigger delay time will occur. In this embodiment, when the real-time temperature of the adjustment circuit exceeds the preset first temperature threshold, the temperature compensation mechanism is triggered, so as to compensate the first time adjustment amount and the second time adjustment amount to improve the accuracy of the trigger delay time. If the real-time temperature value is lower than the second temperature threshold, the preset piecewise linear interpolation method is used for compensation of the adjustment amount; for example, for every 5°C increase in temperature, the delay time increases by 0.1 ms. If the real-time temperature value is not lower than the second temperature threshold, the first time adjustment amount and the second time adjustment amount are adjusted according to the preset dynamic compensation relation, reducing the adjustment step to improve the sensitivity to temperature response.

[0056] In the embodiment of the present invention, it further includes: If the first current information is greater than the overcurrent threshold or the first temperature information is greater than the overtemperature threshold, enter the protection mode; The first time information is set to the minimum reference value; The second time information is set to the maximum reference value; If the duration of the protection mode exceeds the preset safety time threshold; Then disconnect the output control power supply and send a fault code.

[0057] It should be noted that in this embodiment, a running protection mechanism is set. When the real-time current is greater than the overcurrent threshold or the real-time temperature exceeds the over-temperature threshold, the protection mode is entered. By setting the first time information to the minimum reference value and the second time information to the maximum reference value, and setting the cycle period control signal to the lowest duty cycle, the purpose of output current is achieved. In addition, if the duration of the protection mode exceeds the preset safety time threshold, the output power supply is disconnected, and a fault code is generated and sent to the background to improve the maintenance efficiency.

[0058] It is worth mentioning that it also includes: Obtain the energization time of the time-delay relay; When the energization time reaches the first time information or the second time information, collect and obtain the second current information of the time-delay relay; Determine the second current threshold according to the rated current of the coil; Judge whether the second current information is lower than the second current threshold; If not, trigger a contact sticking warning, including an indicator light, a buzzer or sending a warning instruction.

[0059] It should be noted that in this embodiment, by detecting the working current of the control coil of the time-delay relay, a contact sticking warning is triggered. Taking the first time-delay relay as an example: when the energization duration of the control coil reaches the first time information, the working current of the control coil, that is, the second current information, is collected in real time. Then, based on the rated working current of the control coil, the second current threshold is obtained; in practical applications, the second current threshold is 80% of the rated working current. Finally, if the working current of the control coil is less than the second current threshold, it is determined that there is a risk of contact sticking of the switch contacts of the time-delay relay; at this time, a contact sticking warning is issued through an indicator light, a buzzer or a warning instruction.

[0060] It is worth mentioning that it also includes: Obtain the most recent preset number of first current information, first time information and second time information from the historical records; Use the least squares method to fit to obtain the first time relationship formula and the second time relationship formula; When the adjustment circuit starts, obtain the first start time according to the first time relationship formula and the second start time according to the second time relationship formula.

[0061] It should be noted that in this embodiment, data fitting is performed based on the most recent first current information, first time information, and second time information as historical records. For example, based on the most recent 20 sets of information history records, the least squares method is used for fitting to obtain the first time relationship formula and the second time relationship formula. When the adaptive adjustment circuit is powered on and started next time, the first start time and the second start time are respectively calculated based on the first time relationship formula and the second time relationship formula to improve the adjustment efficiency of the cycle period control signal.

[0062] In summary, the present invention provides an adaptive adjustment circuit and method for the cycle period based on a double-delay relay. The adaptive adjustment circuit takes two delay relays as the core, constructs an interlock control logic, and forms a closed-loop trigger mechanism; a cycle period control signal is output through a low-cost circuit. The adaptive adjustment method dynamically monitors the load current and ambient temperature, and based on the preset fuzzy logic control or feedback control, calculates the delay time adjustment amount of the delay relay in real time, and then determines the delay time of the delay relay in combination with the target output frequency; according to the delay time of the delay relay, the adjustable resistor set by the delay adjustment unit is automatically adjusted to achieve the adaptive adjustment of the frequency and duty cycle of the cycle period. In addition, the accuracy of intelligent control is improved through a temperature compensation mechanism; the reliability of intelligent control is improved through an abnormal detection and protection mechanism.

[0063] In addition, in each embodiment of the present invention, the various functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0064] If the above functions are implemented in the form of software function modules and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adaptive adjustment circuit for the cycle period based on a double-delay relay, characterized in that, The circuit includes: a processor, a cycle period output module, an electrical parameter detection module, and a delay adjustment module; The cycle period output module includes a first delay relay and a second delay relay; The normally closed switch of the first delay relay is connected to the output control terminal, the normally open switch of the first delay relay is connected to the control coil of the second delay relay, and the normally closed switch of the second delay relay is connected to the control coil of the first delay relay; The electrical parameter detection module is used to detect the electrical parameters of the adjustment circuit, at least including the current value of the output control terminal and the temperature value of the adjustment circuit; The delay adjustment module is used to adjust the trigger delay time of the first delay relay and the second delay relay; The processor collects the electrical parameters of the circuit through the electrical parameter detection module and adjusts the trigger delay time of the delay relay through the delay adjustment module.

2. The adaptive adjustment circuit for the cycle period based on a double-delay relay according to claim 1, wherein It further includes that the first delay relay includes a homologous single-pole double-throw switch, specifically: The common terminal of the homologous single-pole double-throw switch is connected to the positive pole of the output control power supply; The normally closed terminal of the homologous single-pole double-throw switch is connected to the output control terminal and then to the negative pole of the output control power supply; The normally open terminal of the homologous single-pole double-throw switch is connected to the control coil of the second delay relay and then to the negative pole of the output control power supply.

3. The adaptive adjustment circuit for the cycle period based on a double-delay relay according to claim 1, wherein It further includes that the first delay relay includes a heterologous double-pole double-throw switch, specifically: The normally closed switch of the heterologous double-pole double-throw switch includes a first end and a second end; The first end is connected to the positive pole of the output control power supply; The second end is connected to the output control terminal and then to the negative pole of the output control power supply; The normally open switch of the heterologous double-pole double-throw switch includes a third end and a fourth end; The third end is connected to the positive pole of the coil control power supply; The fourth end is connected to the control coil of the second delay relay and then to the negative pole of the output control power supply.

4. The adaptive regulation circuit for the cycle period based on a double-delay relay according to claim 1, wherein The delay adjustment module specifically includes: a first delay adjustment unit and a second delay adjustment unit; Both the first delay adjustment unit and the second delay adjustment unit are provided with adjustable rheostats for adjusting the trigger delay time of the delay relay; The first delay adjustment unit is used to adjust the trigger delay time of the first delay relay; The second delay adjustment unit is used to adjust the trigger delay time of the second delay relay.

5. An adaptive adjustment method for the cycle period based on a double-delay relay, which is applied to the adaptive adjustment circuit for the cycle period based on a double-delay relay according to any one of claims 1-4, and is characterized in that, The method includes: obtaining the first current information of the output control terminal and the first temperature information of the adjustment circuit; estimating a preset first adjustment amount algorithm, and obtaining a first time adjustment amount and a second time adjustment amount according to the first current information and the first temperature information; obtaining the first time information of the first delay relay and the second time information of the second delay relay; updating the first time information according to the first time adjustment amount and updating the second time information according to the second time adjustment amount; obtaining target duty cycle information according to the first time information and the second time information; adjusting the first time information and the second time information based on the preset target frequency information according to the target duty cycle information; adjusting the first delay adjustment unit of the delay adjustment module according to the first time information; Adjust the second delay adjustment unit of the delay adjustment module according to the second time information.

6. The adaptive adjustment method for the cycle period based on a double-delay relay according to claim 5, wherein It further includes that the first adjustment amount algorithm is a fuzzy logic control algorithm, specifically: Obtain the rated current information and the rated temperature information; Based on the rated current information, obtain a five-level current interval set; Based on the rated temperature information, obtain a five-level temperature interval set; Based on the five-level current interval set, obtain the current adjustment level according to the first current information; Based on the five-level temperature interval set, obtain the temperature adjustment level according to the first temperature information; According to the current adjustment level and the temperature adjustment level, look up a preset adjustment correspondence table to obtain the first time adjustment amount and the second time adjustment amount.

7. An adaptive adjustment method for the cycle period based on a double-delay relay according to claim 5, characterized in that, It further includes that the first adjustment amount algorithm is a first feedback control algorithm, specifically: Obtain the rated current information and the rated temperature information; Calculate the difference between the first current information and the rated current information to obtain the current deviation information; Calculate the difference between the first temperature information and the rated temperature information to obtain the temperature deviation information; According to the current deviation information and the temperature deviation information, obtain the proportional control amount according to the proportional weight value; According to the integral value of the current deviation information and the integral value of the temperature deviation information, obtain the integral control amount according to the integral weight value; According to the proportional control amount and the integral control amount, obtain the feedback control amount for obtaining the first time adjustment amount and the second time adjustment amount.

8. An adaptive adjustment method for the cycle period based on a double-delay relay according to claim 7, characterized in that, It further includes: Based on the discrete Fourier transform, obtain the current fluctuation frequency information according to the first current information; Judge whether the current fluctuation frequency information is greater than a preset first fluctuation frequency threshold; If so, adjust the integral weight value downward; If not, judge whether the current fluctuation frequency information is less than a preset second fluctuation frequency threshold; If so, adjust the integral weight value upward.

9. An adaptive adjustment method for the cycle period based on a double-delay relay according to claim 5, characterized in that It further includes a temperature compensation mechanism, specifically: When the first temperature information is greater than a preset first temperature threshold, trigger temperature compensation; Judge whether the first temperature information is lower than a preset second temperature threshold; If so, use a preset piecewise linear interpolation method to perform interpolation compensation on the first time adjustment amount and the second time adjustment amount; If not, adjust the first time adjustment amount and the second time adjustment amount according to a preset dynamic compensation relational expression.

10. An adaptive adjustment method for the cycle period based on a double-delay relay according to claim 5, characterized in that, It further includes: If the first current information is greater than the overcurrent threshold or the first temperature information is greater than the overtemperature threshold, enter the protection mode; Set the first time information to the minimum reference value; Set the second time information to the maximum reference value; If the protection mode duration exceeds a preset safety time threshold; Then disconnect the output control power supply and send a fault code.

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