An ultra-low power monostable relay control method

Abstract

The application discloses a monostable relay control method with ultra-low power consumption, relates to the technical field of fire linkage control, and solves the technical problems that the relay in the prior art has high energy consumption in the working process and has the hidden danger of relay tripping; in the application, a control module controls a relay by controlling the output voltage of a voltage regulating module, so that the output voltage of the voltage regulating module can be set by controlling the voltage regulating module; even if the voltage fluctuation of a fire line is relatively large, the output voltage of a fire circuit is unstable, but the feedback of an input signal can still ensure the normal working of the relay and minimize the power consumption; meanwhile, the control module judges the working state of the relay through the input signal, so that a feedback system is formed to prevent the tripping of the relay caused by abnormal conditions, and the working mode of the control module is determined based on the feedback condition, so that the relay failure caused by abnormal conditions is effectively avoided, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire linkage control, and particularly relates to a single-stable relay control method with ultra-low power consumption. BACKGROUND

[0002] In a fire linkage control system, it is necessary to realize the start-stop control of facilities such as fans, roller shutter doors, electric window openers and the like, which is usually controlled by an output module to control the relay output contact signal. The controlled relay includes a magnetic holding relay and a single-stable relay. The magnetic holding relay has low power consumption, but is prone to output state change caused by vibration and has high cost. The single-stable relay has high power consumption, and in a two-wire fire linkage control system, the number of loop loads is limited.

[0003] The existing technology directly controls the relay through a PWM signal, which has certain safety hazards when the fire voltage fluctuates greatly. For example, if the output voltage of the fire circuit is lower than the starting voltage of the relay, the relay cannot be started; if the output voltage of the fire circuit is too high, the relay coil may be damaged, thereby shortening the service life. At the same time, the existing technology uses a PWM signal and a capacitor to maintain, which has low voltage reduction efficiency and limited energy consumption reduction.

[0004] The present application provides a single-stable relay control method with ultra-low power consumption to solve the above technical problems. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art; for this purpose, the present application provides a single-stable relay control method with ultra-low power consumption, which is used to solve the technical problems of high energy consumption of the relay in the working process and the risk of relay tripping in the prior art. The present application reduces the power consumption of the relay by controlling the relay to maintain the voltage in the working process, and at the same time, forms a closed-loop control through the input signal, so that the relay is in a low-voltage stable state and maintains the attracted state to solve the above problems.

[0006] To achieve the above purpose, the first aspect of the present application provides a single-stable relay control method with ultra-low power consumption, comprising:

[0007] After the control module receives the control instruction, the input signal generated by the sampling module is matched and operated to generate a signal PWM1, and the relay is started by controlling the voltage regulating module through the signal PWM1; wherein the control instruction includes a start instruction and a relay contact disconnection signal when the control module is in a start state, and the input signal includes a voltage regulating module input voltage, a voltage regulating module output voltage and a relay contact state;

[0008] The control module judges whether the starting time of the relay exceeds the time threshold value; if yes, a signal PWM2 is generated to control the voltage regulating module to reduce the output voltage of the voltage regulating module to the maintenance voltage; wherein the relay is a multi-pole multi-throw relay, and the time threshold value refers to the time required for the relay to complete the attraction action.

[0009] The control module collects the input voltage and output voltage of the voltage regulating module through the sampling module, generates a signal PWM3 based on the input voltage and the maintenance voltage of the voltage regulating module, and controls the voltage regulating module to keep the relay working through the signal PWM3.

[0010] The control module controls the relay by controlling the output voltage of the voltage regulating module instead of directly using PWM to control the relay, so that the output voltage of the voltage regulating module can be set according to the input voltage of the voltage regulating module. Since the voltage of the fire-fighting circuit fluctuates greatly, the output voltage of the fire-fighting circuit is unstable. If the output voltage of the fire-fighting circuit is lower than the starting voltage of the relay, the relay cannot be started, which may cause safety hazards; if the output voltage of the fire-fighting circuit is too high, the relay coil may be damaged directly using the PWM method, which may shorten the service life.

[0011] The control module judges whether the relay is in the working state by collecting the state of the relay contact, which constitutes a feedback system to prevent abnormal conditions from causing the relay to trip, and the control module determines the working mode based on the feedback system. At the same time, the monitoring of the input signal can determine when the output voltage of the voltage regulating module controls the relay to be safe and low in power consumption.

[0012] In summary, the application can eliminate the influence of the fire-fighting circuit fluctuation on the relay, determine the working mode of the control module through the feedback system, and keep the relay in a safe and low-power-consumption state.

[0013] Preferably, when the input voltage of the voltage regulating module is within the rated range, the minimum output voltage of the voltage regulating module is less than the release voltage of the relay, and the maximum output voltage is greater than the rated working voltage of the relay.

[0014] The output voltage of the voltage regulating module is set according to the input voltage of the voltage regulating module. According to the fluctuation value of the fire-fighting voltage, the maximum output voltage of the voltage regulating module is calculated according to the minimum value of the fire-fighting circuit voltage, so that the relay can be started when the voltage of the fire-fighting circuit is at the minimum. This can effectively prevent safety accidents caused by the failure of the fire-fighting relay to work normally due to low voltage of the fire-fighting circuit when an emergency occurs.

[0015] The output voltage of the voltage regulating module is set according to the input voltage of the voltage regulating module, and the minimum output voltage of the voltage regulating module is calculated according to the fluctuation value of the fire-fighting voltage and the maximum value of the fire-fighting circuit voltage, so as to ensure that the relay can be reduced to the maintaining voltage when the fire-fighting circuit has the maximum voltage, and the relay can keep the working state and maintain low energy consumption.

[0016] Preferably, the maintaining voltage of the relay is greater than the releasing voltage of the relay.

[0017] The releasing voltage refers to that the voltage applied on the coil of the relay is reduced to a certain critical value, and the voltage value is low enough to maintain the electromagnetic attraction of the relay, and the maintaining voltage is just greater than the voltage, so as to maintain the electromagnetic attraction of the relay and keep the working state of the relay. When the relay completes the attraction action, the maintaining voltage of the relay in the maintaining working state can effectively reduce the power of the coil of the relay and reduce the energy consumption.

[0018] The V VD ≥0.4V GD , and V VD is the maintaining voltage of the relay, V GD is the working voltage of the relay. According to the calculation of the maintaining voltage equal to 0.4 times the working voltage, the power calculation formula P=U2 / R is used to calculate that P VD =0.16P GD , P VD is the power of the maintaining voltage, and P GD is the power of the working voltage.

[0019] Therefore, by using the voltage regulating module, the energy consumption can be greatly reduced after the relay works and the working state of the relay is maintained.

[0020] Preferably, the signal PWM3 is generated based on the input voltage and the maintaining voltage of the relay, and the signal PWM3 comprises:

[0021] It is judged whether the output voltage is consistent with the maintaining voltage. If yes, no processing is performed. If no, the input voltage of the voltage regulating module and the maintaining voltage of the relay are extracted.

[0022] The input voltage of the voltage regulating module and the maintaining voltage of the relay are matched to generate the signal PWM3. The matching operation is used to adjust the duty cycle of the signal PWM3.

[0023] Preferably, the matching operation is used to adjust the duty cycle of the PWM signal by the control module, and the matching operation comprises:

[0024] A preset voltage duty cycle table is extracted. The voltage duty cycle table comprises the input voltage, the output voltage of the voltage regulating module and the duty cycle of the PWM signal.

[0025] The voltage duty cycle table is used to match the duty cycle of the PWM signal corresponding to the input voltage and the output voltage of the voltage regulating module, and the PWM signal is generated according to the duty cycle of the PWM signal corresponding to the output voltage.

[0026] Preferably, the manufacturing process of the voltage duty cycle table comprises:

[0027] The input voltage of the voltage regulating module is divided into a plurality of input sub-voltages according to a set voltage step, and the PWM signal of the control module is divided into a plurality of PWM sub-signals according to a set duty cycle step.

[0028] The plurality of input sub-voltages and the plurality of PWM sub-signals are arranged and combined to generate a plurality of data groups, wherein each data group comprises one input sub-voltage and one PWM sub-signal.

[0029] The output voltage of the voltage regulating module corresponding to the plurality of data groups is simulated, and the voltage duty cycle table is generated according to the plurality of data groups and the corresponding output voltage of the voltage regulating module.

[0030] When the input voltage is determined, the corresponding output voltage can be matched by sending a specified PWM signal. Through this table, even if the input voltage fluctuates, the desired output voltage can still be obtained by adjusting the duty cycle of the output PWM signal. At the same time, when the output voltage is collected, the duty cycle of the PWM signal can be adjusted according to the input voltage to adjust the output voltage of the voltage regulating module in time, thereby ensuring the stability of the output voltage.

[0031] Compared with the prior art, the beneficial effects of the present application are: in the present application, the control module controls the relay by controlling the output voltage of the voltage regulating module, so that the output voltage of the voltage regulating module can be set by controlling the voltage regulating module. Even if the voltage of the fire-fighting circuit fluctuates greatly, resulting in unstable output voltage of the fire-fighting circuit, the relay can still work normally through the feedback of the input signal, and the power consumption is minimized. At the same time, the control module determines the working state of the relay through the input signal, so as to form a feedback system to prevent the relay from tripping due to abnormal conditions, and to determine the working mode of the control module based on the feedback. In this way, the relay failure caused by abnormal conditions is effectively avoided, and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1A method flowchart of an embodiment of the present application is shown in the figure.

[0034] Figure 2 A voltage duty cycle table making flowchart of an embodiment of the present application is shown in the figure.

[0035] Figure 3 A system principle schematic diagram of an embodiment of the present application is shown in the figure.

[0036] Figure 4 A relay action schematic diagram of an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described in detail below with reference to the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0038] Please refer to Figure 1 The first aspect embodiment of the present application provides a monostable relay control method with ultra-low power consumption, comprising:

[0039] Step S1: After the control module receives the control instruction, it performs matching operation according to the input signal and sends out signal PWM1, which controls the voltage regulating module to start the relay through signal PWM1.

[0040] The input signal includes the input voltage of the voltage regulating module, the output voltage of the voltage regulating module and the relay contact state. The relay refers to a multi-pole multi-throw relay. The control instruction includes the start instruction and the relay contact disconnection signal when the control module is in the start state.

[0041] For example, the relay selects a double-pole double-throw relay. One group of contacts controls the fire-fighting equipment, and one group of contacts feeds back the relay working state.

[0042] The output of the voltage regulating module is connected to the control coil of the relay, i.e. the output voltage of the voltage regulating module and the coil voltage of the relay are the same. One of the contacts of the relay controls the fire-fighting equipment, and the other contact is connected to the controller as a feedback signal; in this way, the relay controls the fire-fighting equipment, and the control module can monitor the working state of the relay at any time, ensuring the normal use of the fire-fighting equipment.

[0043] The generation of PWM1 is first determined by the relay specification manual, i.e. the working voltage of the relay is determined, i.e. the output voltage of the voltage regulating module is determined; secondly, the input voltage of the voltage regulating module is collected. According to the determined output voltage and input voltage of the input module, signal PWM1 is obtained through matching operation. The matching operation is determined by the voltage duty cycle table.

[0044] If the manual cannot find the working voltage of the relay, the working voltage can be obtained by testing.

[0045] Step S2: After the relay startup duration exceeds the duration threshold, the control module sends out signal PWM2, which controls the voltage regulating module to make the voltage regulating module output voltage decrease to the maintenance voltage.

[0046] The maintenance voltage refers to the voltage that keeps the relay in the working state after the relay is in the working state.

[0047] The duration threshold refers to the time for the relay to complete the attraction action.

[0048] For example: If the action time for the relay to start attraction to the working state is 0.1S, the duration threshold is 0.1S. That is, when the relay startup time exceeds 0.1S, the control module sends out signal PWM2.

[0049] The generation of signal PWM2 first determines the maintenance voltage of the relay through the relay instruction manual, that is, the output voltage of the voltage regulating module; secondly, the input voltage of the voltage regulating module is collected. Signal PWM2 is obtained by matching operation according to the output voltage and input voltage of the voltage regulating module. The matching operation is determined by the voltage duty cycle table.

[0050] If the manual cannot find the maintenance voltage of the relay, the maintenance voltage can be obtained by testing.

[0051] The relay maintenance voltage is greater than the relay release voltage.

[0052] For example: The maintenance voltage of the relay is ≥1.2 times the release voltage of the relay. Under this maintenance voltage of the relay, the relay can effectively maintain the working state of the relay and eliminate the tripping problem caused by the vibration factor.

[0053] When the input voltage of the voltage regulating module is within the rated range, the minimum output voltage of the voltage regulating module is less than the release voltage of the relay, and the maximum output voltage is greater than the rated working voltage of the relay.

[0054] For example: The input voltage range of the voltage regulating module is 10V to 60V. When the input voltage fluctuates between 10V and 60V, the minimum output voltage of the voltage regulating module is less than the release voltage of the relay, and the maximum output voltage is greater than the rated working voltage of the relay after adjusting the duty cycle.

[0055] The voltage of the fire circuit usually fluctuates in the range of 14V to 48V. The minimum output voltage of the voltage regulating module is less than the release voltage of the relay, and the maximum output voltage is greater than the rated working voltage of the relay after adjusting the duty cycle. This can ensure the stable working of the relay.

[0056] Step S3: The control module sends a signal PWM3 to control the voltage regulating module to keep the relay working after matching the input voltage and the output voltage of the voltage regulating module.

[0057] The signal PWM1, the signal PWM2 and the signal PWM3 are PWM signals sent by the same PWM port of the control module.

[0058] The signal PWM1 is used to control the output voltage of the voltage regulating module to reach the working voltage of the relay by collecting the input voltage of the voltage regulating module through the collection module.

[0059] The signal PWM2 is used to control the output voltage of the voltage regulating module to convert to the maintaining voltage of the relay by collecting the input voltage of the voltage regulating module through the collection module.

[0060] The signal PWM3 is used to control the output voltage of the voltage regulating module by collecting the input voltage of the voltage regulating module through the collection module, and the control module determines the control precision according to the output voltage of the voltage regulating module, and adjusts the duty cycle of the output PWM signal to adjust the output voltage. Through closed-loop control, the output voltage of the voltage regulating module is kept at a high-precision value.

[0061] Referring to Figure 2 The voltage duty cycle table making process of the embodiment is as follows:

[0062] Step S11: The input voltage JR of the voltage regulating module is divided into i input voltages JRi according to a specified voltage step, and the PWM output signal KZ of the controller is divided into j PWM output signals KZj according to a specified duty cycle step; wherein i is the input voltage number and is a positive integer, and j is the PWM output signal number and is a positive integer.

[0063] Step S12: The corresponding output voltage JCij of the voltage regulating module is recorded when the input voltage JRi of the voltage regulating module and the PWM output signal KZj are determined.

[0064] Step S13: The corresponding relationship between the output voltage JCij of the voltage regulating module, the input voltage JRi of the voltage regulating module and the PWM output signal KZj is obtained by recording data and statistics.

[0065] Step S14: The statistical data is divided and made into a voltage duty cycle table according to the output voltage JCij of the voltage regulating module, the input voltage JRi of the voltage regulating module and the PWM output signal KZj.

[0066] For example: test group 1. The input voltage of the voltage regulating module is 100V, the duty cycle of the PWM signal of the control module is 60%, and the output voltage of the voltage regulating module is 60V.

[0067] Test group 2. The input voltage of the voltage regulating module is 150V, the duty ratio of the PWM signal of the control module is 40%, and the output voltage of the voltage regulating module is 60V.

[0068] Therefore, when the output voltage of the voltage regulating module needs to be 60V, the input voltage of the voltage regulating module is collected to be 100V, and the duty ratio of the PWM signal output by the control module is 60%;

[0069] When the input voltage of the voltage regulating module is collected to be 150V, the duty ratio of the PWM signal output by the control module is 40%.

[0070] Please refer to Figure 3 , the system principle of the embodiment of the application is as follows:

[0071] The control module: sends a PWM signal to control the relay through the voltage regulating module; and collects the relay and voltage regulating module information through the sampling module.

[0072] The sampling module collects the relay contact state information, the input voltage of the voltage regulating module, and the output voltage signal of the voltage regulating module.

[0073] Please refer to Figure 4 , the relay action of the embodiment of the application is as follows:

[0074] When the control module receives a control instruction, the relay coil voltage changes according to the output voltage of the voltage regulating module.

[0075] The control module first controls the output voltage of the voltage regulating module to reach the working voltage of the relay to make the relay attract.

[0076] After the relay attraction action is completed, the control module controls the voltage regulating module to reduce the voltage to the maintenance voltage, and the relay coil voltage changes from the working voltage to the maintenance voltage to maintain the working state.

[0077] When the control module receives the contact opening signal of the relay, the control module controls the output voltage of the voltage regulating module to reach the working voltage to make the relay attract.

[0078] After the relay attraction action is completed, the maintenance voltage output by the voltage regulating module is received, the relay coil voltage changes to the maintenance voltage, and the working state is maintained.

[0079] Among them, the maintenance voltage of the relay coil ≥ 0.4 times the working voltage of the relay coil.

[0080] Some data in the above formula are removed from the dimension to calculate the numerical value, and the formula is obtained by software simulation of a large amount of collected data to obtain a formula closest to the real situation; the preset parameters and the preset threshold in the formula are set by the person skilled in the art according to the actual situation or obtained by a large amount of data simulation.

[0081] Part of the data in the above formula is calculated by removing the dimension, and the formula is obtained by software simulation of a large amount of collected data to be closest to the real situation; the preset parameters and the preset threshold in the formula are set by the person skilled in the art according to the actual situation or obtained by a large amount of data simulation.

[0082] The working principle of the present application is as follows: firstly, the working voltage, the holding voltage of the relay and the time length of the relay completing the attraction action are obtained according to the relay specification or experimental test; at the same time, the voltage duty cycle table is obtained through the experiment, which is used to determine the relationship between the input voltage of the voltage regulating module, the output voltage of the voltage regulating module and the duty cycle of the output PWM signal of the control module. Secondly, the control module collects the input voltage of the voltage regulating module, the output voltage of the voltage regulating module and the relay contact state through the acquisition module, determines the duty cycle of the output PWM signal of the control module, controls the output voltage of the voltage regulating module through the PWM signal to make the relay complete the starting and after completing the starting, the relay is kept in the holding voltage to keep the relay in the working state and save the energy consumption.

[0083] The above embodiments are only used to illustrate the technical method of the present application and are not limited. Although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical method of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical method of the present application.

Claims

1. A monostable relay control method with ultra-low power consumption, characterized in that, after the control module receives a control instruction, a signal PWM1 is generated by matching the input signal sent by the sampling module, and the relay is started by controlling the voltage regulating module through the signal PWM1; wherein the control instruction includes a start instruction and a relay contact opening signal when the control module is in a start state, and the input signal includes the input voltage of the voltage regulating module, the output voltage of the voltage regulating module and the state of the relay contact; the control module determines whether the relay start duration exceeds a duration threshold; if yes, a signal PWM2 is generated to control the voltage regulating module to reduce the output voltage of the voltage regulating module to a maintenance voltage; wherein the relay is a multi-pole multi-throw relay, and the duration threshold refers to the time required for the relay to complete the attraction action; the control module collects the input voltage and output voltage of the voltage regulating module through the sampling module, generates a signal PWM3 based on the input voltage and the maintenance voltage of the voltage regulating module, and controls the voltage regulating module to keep the relay working through the signal PWM3; the generation of the signal PWM3 based on the input voltage and the maintenance voltage of the voltage regulating module includes: determining whether the output voltage is consistent with the maintenance voltage; if yes, no processing is performed; if no, the input voltage of the voltage regulating module and the maintenance voltage of the relay are extracted; matching operation is performed based on the input voltage of the voltage regulating module and the maintenance voltage of the relay to generate the signal PWM3; wherein the matching operation is used to adjust the duty cycle of the signal PWM3; the matching operation is to adjust the duty cycle of the PWM signal through the control module, including: extracting a preset voltage duty cycle table; wherein the voltage duty cycle table includes the input voltage, output voltage and duty cycle of the PWM signal of the voltage regulating module; matching the duty cycle of the PWM signal corresponding to the input voltage and output voltage of the voltage regulating module based on the voltage duty cycle table; and generating the PWM signal according to the duty cycle of the PWM signal corresponding to the output voltage.

2. The method of claim 1, wherein the method is a monostable relay control method with ultra-low power consumption, characterized in that, When the input voltage of the voltage regulating module is within the rated range, the minimum output voltage of the voltage regulating module is less than the release voltage of the relay, and the maximum output voltage is greater than the rated working voltage of the relay.

3. The method of claim 1, wherein the method is a monostable relay control method with ultra-low power consumption, characterized in that, The maintenance voltage of the relay is greater than the release voltage of the relay.

4. The method of claim 1, wherein the method is a monostable relay control method with ultra-low power consumption, characterized in that, The manufacturing process of the voltage duty cycle table includes: dividing the input voltage of the voltage regulating module into several input sub-voltages according to a set voltage step; and dividing the PWM signal of the control module into several PWM sub-signals according to a set duty cycle step; arranging and combining the several input sub-voltages and the several PWM sub-signals to generate several data groups; wherein a data group includes an input sub-voltage and a PWM sub-signal; simulating the output voltage of the voltage regulating module corresponding to the several data groups, and generating a voltage duty cycle table according to the several data groups and the corresponding output voltage of the voltage regulating module.

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