CN113451076A - Voltage suppression device and method based on zero-crossing detection and storage medium - Google Patents
Voltage suppression device and method based on zero-crossing detection and storage medium Download PDFInfo
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- CN113451076A CN113451076A CN202010231865.4A CN202010231865A CN113451076A CN 113451076 A CN113451076 A CN 113451076A CN 202010231865 A CN202010231865 A CN 202010231865A CN 113451076 A CN113451076 A CN 113451076A
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- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
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Abstract
The embodiment of the application provides a voltage suppression device and method based on zero-crossing detection and a storage medium. The zero point detection circuit is used for detecting the zero point of the alternating current signal; the on-off detection circuit is used for detecting the on-off state of the on-off device and outputting an action signal of the on-off device; the control circuit is used for determining the zero point moment of the alternating current signal according to the zero point detection signal, determining the action time and the rebound time from the output of the control signal to the action of the on-off device according to the action signal, and determining the output moment of the control signal according to the action time, the rebound time and the zero point moment so as to enable the middle moment of the rebound time after the control signal is output next time to coincide with the zero point moment of the alternating current signal. The voltage suppression device provided by the embodiment of the application can effectively suppress the voltage when the contact of the on-off device is attracted, and the contact adhesion caused by the arc generated by the on-off device is avoided.
Description
Technical Field
The application relates to the technical field of automation control, in particular to a voltage suppression device and method based on zero-crossing detection and a storage medium.
Background
On-off devices (e.g., electromagnetic relays) are widely used in automated control. The contacts are the most important components of the switching device and are also the most vulnerable parts. Because the voltage difference exists at the two ends of the contact of the on-off device, the on-off device can generate electric arc when attracting or disconnecting, so that the contact is adhered. Therefore, how to avoid the arcing phenomenon of the switching device has been a research hotspot of those skilled in the art.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a voltage suppression device, a voltage suppression method, and a storage medium based on zero-cross detection, which can effectively suppress a voltage when contacts of an on-off device are attracted, thereby preventing the contacts from being stuck due to an arc generated by the on-off device.
In a first aspect, an embodiment of the present application provides a voltage suppression device based on zero-crossing detection, where the voltage suppression device includes: the device comprises a zero point detection circuit, an on-off detection circuit and a control circuit; the zero point detection circuit is used for detecting the zero point of the alternating current signal and outputting a zero point detection signal; the on-off detection circuit is used for connecting the on-off device, detecting the on-off state of the on-off device and outputting an action signal of the on-off device in the on-off state; and the control circuit is connected with the zero point detection circuit and the on-off detection circuit, the control circuit is used for connecting the on-off device and outputting a control signal to the on-off device, wherein the control circuit is used for: determining the zero point moment of the alternating current signal according to the zero point detection signal; determining action time and rebound time from the output of the control signal to the action of the on-off device according to the action signal; and determining the output time of the control signal according to the action time, the rebound time and the zero point time, so that the middle time of the rebound time after the next control signal output is coincident with the zero point time of the alternating current signal.
In a second aspect, an embodiment of the present application provides a voltage suppression method based on zero-crossing detection, where the method includes: determining the zero point moment of the alternating current signal; acquiring an action signal of the on-off device, and determining action time and rebound time from the output of the control signal to the action of the on-off module according to the action signal; and determining the output time of the control signal according to the action time, the rebound time and the zero point time, so that the middle time of the rebound time after the next control signal output is coincident with the zero point time of the alternating current signal.
In a third aspect, an embodiment of the present application provides a computer-readable storage medium storing program instructions, which when executed by a processor implement the above-mentioned method.
Compared with the prior art, the voltage suppression device based on the zero-crossing detection is provided with a zero-point detection circuit, an on-off detection circuit and a control circuit, and the zero point of the alternating current signal is detected through a part detection circuit; the on-off state of the on-off device is detected through the on-off detection circuit, so that the control circuit can calculate the zero point time of the alternating current point signal and the action time and the rebound time of the on-off device, and the control circuit determines the output time of the control signal according to the action time, the rebound time and the zero point time so as to enable the middle time of the rebound time after the control signal is output next time to coincide with the zero point time of the alternating current signal.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic connection diagram of a voltage suppression device and an on-off device provided in an embodiment of the present application.
Fig. 2 shows a schematic circuit diagram of a voltage suppression device and a switching device provided in an embodiment of the present application.
Fig. 3 shows another circuit schematic of the zero-point detection circuit of fig. 2.
Fig. 4 shows a further circuit schematic of the zero-point detection circuit of fig. 2.
Fig. 5 shows a schematic diagram of the output timing of the control signal in the embodiment of the present application.
Fig. 6 shows a schematic flowchart of a voltage suppression method according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
On-off devices (e.g., electromagnetic relays) are widely used in automated control. The contacts are the most important components of the switching device and are also the most vulnerable parts. At the moment of the action (attraction or disconnection) of the on-off device, due to the voltage difference between the two ends of the contact, electric arcs can be easily generated, and the contact is adhered. The person skilled in the art is constantly working on how to avoid arcing of the switching device. The existing method is to restrain the voltage at two ends of the contact at the moment of closing or opening the contact, so that the contact is closed when the alternating current crosses zero, and the voltage difference at the two ends of the contact is minimum at the moment, thereby avoiding the generation of electric arc when the on-off device acts. However, since the contact of the on-off device is usually a mechanical spring, after the contact is first attracted or disconnected, the spring contact will rebound many times, the contact will still be attracted and disconnected repeatedly, and the contact will cross the zero point of the alternating current after the first attraction or disconnection, so that a large arc may still be generated during the contact rebound process, resulting in the contact being stuck.
In order to solve the above problems, the inventors have made long-term studies and have proposed a voltage suppression device, a method, and a storage medium based on zero-crossing detection in the embodiments of the present application, which are provided with a zero-point detection circuit, an on-off detection circuit, and a control circuit, and detect a zero point of an ac electrical signal by the zero-point detection circuit; the on-off state of the on-off device is detected through the on-off detection circuit, so that the control circuit can calculate the zero point time of an alternating current point signal and the action time and the rebound time of the on-off device, and the control circuit determines the output time of a control signal according to the action time, the rebound time and the zero point time, so that the on-off device is overlapped with the next zero point time at the middle time of the rebound time, therefore, the average voltage difference of contacts of the on-off device in the rebound process can be minimized, the voltage of the on-off device during the action of the contacts is effectively restrained, and the contact adhesion caused by the generation of electric arcs by the on-off device is avoided.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, fig. 1 schematically shows a connection schematic diagram of a voltage suppression device 100 and an on-off device 110 provided in an embodiment of the present application. The switching device 110 includes, but is not limited to, a relay and a switch, and the switching device 110 in the embodiment of the present application is merely illustrated as a relay.
The voltage suppression device 100 includes a control circuit 10, an on/off detection circuit 20, and a zero point detection circuit 30. One end of the zero point detection circuit 30 is used for receiving the alternating current signal, and the other end is connected to the control circuit 10; the zero point detection circuit 30 is configured to detect a zero point of the ac electrical signal and output a zero point detection signal to the control circuit 10. The on-off detection circuit 20 is connected to the on-off device 110, detects an on-off state of the on-off device 110, and outputs an operation signal of the on-off device 110 in the on-off state. The control circuit 10 is used for connecting the on-off device 110 and outputting a control signal to the on-off device 110, the control circuit 10 is further connected to the zero point detection circuit 30 and the on-off detection circuit 20, and the control circuit 10 is further used for determining a zero point moment of the alternating current signal according to the zero point detection signal and determining an action time and a rebound time from the output of the control signal to the action of the on-off device 110 according to the action signal. The control circuit 10 is further configured to determine an output time of the control signal according to the operation time, the bounce time, and the zero point time, so that a middle time of the bounce time after the next output of the control signal coincides with the zero point time of the ac electrical signal. Therefore, the average voltage difference of the contacts of the on-off device 110 in the rebound process can be minimized, so that the voltage of the contacts of the on-off device 110 in the action process is effectively inhibited, and the contacts are prevented from being adhered due to the generation of electric arcs by the on-off device 110.
In this embodiment, the control circuit 10 may be a Micro Controller Unit (MCU). The control circuit 10 is used to control the on/off of the on/off device 110. Specifically, the control circuit 10 outputs a control signal to the on/off device 110 to operate (engage or disengage) the on/off device 110. Since the contacts of the on-off device 110 are mechanical spring pieces, and a process of a mechanical spring piece action is required from the time when the on-off device 110 receives the control signal to the time when the contacts are closed or opened, an action time exists between the time when the control signal is output from the control circuit 10 and the time when the on-off device 110 is closed or opened for the first time. When the control signal output by the control circuit 10 controls the on-off device 110 to be attracted, the action time is called attraction time; when the on-off device 110 is controlled to be turned off by the control signal output by the control circuit 10, the action time is called release time. After the on-off device 110 is first attracted or disconnected, the spring contact of the on-off device 110 will rebound for many times until the contact is stably attracted or stably disconnected, so that there is a rebound time from the first attraction to the complete attraction or from the first disconnection to the complete disconnection in the on-off device 110.
The on-off detection circuit 20 is used to detect the on-off state of the on-off device 110, that is, to detect the actions of the contacts of the on-off device 110 before the contacts are completely closed or completely opened, including the first action when the on-off device 110 is closed or opened for the first time and the bounce action when the on-off device is completely closed or opened for the second time. The on-off detection circuit 20 outputs an action signal corresponding to the action of the on-off device 110 to the control circuit 10, and the control circuit 10 can calculate the action time from the sending of the control signal to the first action of the on-off device 110 and the rebound time from the first action to the complete action of the on-off device 110 according to the time for receiving the action signal for the first time and the time for receiving the action signal for the last time. In some embodiments, when the on-off detection circuit 20 detects the motion of the on-off device 110, it can calculate the time interval of each motion and output the motion time signal to the control circuit 10, and the control circuit 10 can calculate the motion time and the bounce time of the on-off device 110 according to the received motion time signal.
The alternating current signal is a sine wave with two zero crossings per cycle. When the alternating current crosses zero, the zero point detection circuit 30 outputs a zero point detection signal to the control circuit 10, and the control circuit 10 can calculate each zero point time of the alternating current signal according to the zero point detection signal.
When the on-off device 110 needs to be controlled to operate next time, the control circuit 10 delays to output the control signal when the zero point time arrives according to the calculated operation time and the calculated rebound time of the on-off detection circuit 20, so that the middle time of the rebound time is exactly coincident with the next zero point time. Because the middle moment of contact point rebound is just zero-crossing point, the average voltage difference at two ends of the contact point can be minimum in the whole process of contact point rebound. It should be noted that, since the first time the contact is operated is the initial time of the bounce process, the average voltage difference is calculated to include the voltage difference at the first time the contact is operated. The average voltage difference of the contacts of the on-off device 110 in the whole action process can be minimized, thereby effectively inhibiting the voltage when the contacts of the on-off device 110 are attracted, and avoiding the contacts from being adhered due to the generation of electric arcs by the on-off device 110.
The voltage suppression device based on zero-crossing detection provided by the embodiment is provided with a zero-point detection circuit, an on-off detection circuit and a control circuit, and detects the zero point of an alternating current signal through a part detection circuit; the on-off state of the on-off device is detected through the on-off detection circuit, so that the control circuit can calculate the zero point time of an alternating current point signal and the action time and the rebound time of the on-off device, and the control circuit determines the output time of a control signal according to the action time, the rebound time and the zero point time, so that the on-off device is overlapped with the next zero point time at the middle time of the rebound time, therefore, the average voltage difference of contacts of the on-off device in the rebound process can be minimized, the voltage of the on-off device during the action of the contacts is effectively restrained, and the contact adhesion caused by the generation of electric arcs by the on-off device is avoided.
As shown in fig. 2, the embodiment of the present application further provides a circuit schematic diagram of the voltage suppressing device 200 and the on-off device 240. The switching device 240 may be connected to the load to control the electrical switching of the load. The on-off device 240 includes, but is not limited to, a switch and a relay, and the embodiment of the present application is only described by taking the relay as an example. Voltage suppression device 200 includes a zero point detection circuit 210, an on/off detection circuit 220, and a control circuit 230, which are substantially the same as those of voltage suppression device 100 described above, and achieves the same functions as those of voltage suppression device 100 described above. Wherein, one end of the zero point detection circuit 210 is used for receiving the ac electrical signal, and the other end is connected to the control circuit 230; the on-off detection circuit 220 is used for connecting the on-off device 240 and detecting the on-off state of the on-off device 240; the control circuit 230 is connected to the zero point detection circuit 210 and the on-off detection circuit 220, and is used to control the operation of the on-off device 240.
In this embodiment, the zero point detection circuit 210 includes a rectifier and a signal processing element, one end of the rectifier is used for receiving the ac electrical signal, one end of the rectifier is connected to the signal processing element, and the other end of the signal processing element is connected to the control circuit and outputs the zero point detection signal. The signal processing unit includes, but is not limited to, a triode, a MOS transistor, a thyristor, and an optical coupling element.
In some embodiments, the signal processing element is a light coupling element. Specifically, as shown in fig. 2, the zero point detection circuit 210 includes a rectifier, an optical coupling element U1, a resistor R1, and a resistor R2. One end of the rectifier is used for receiving alternating current signals, the other end of the rectifier is connected with the optical coupling element U1 through a resistor R1, the other end of the optical coupling element U1 is connected with the control circuit 230, and the other end of the optical coupling element U1 is connected with a VCC power supply through a resistor R2. When the alternating current crosses zero, the optocoupler outputs a pulse signal at the output to the control circuit 230. The control circuit 230 can calculate each zero point time and the zero point cycle of the zero point time of the ac electric signal based on the time and the interval time of receiving the pulse signal.
In some embodiments, the signal processing element is a triode. Specifically, as shown in fig. 3, the zero point detection circuit 210 includes a rectifier, a transistor Q1, a resistor R1, and a resistor R2. One end of the rectifier is used for receiving alternating current signals, the other end of the rectifier is connected with the base electrode of the triode Q1 through a resistor R1, the collector electrode of the triode Q1 is connected with the control circuit 230 and is connected with a VCC power supply through a resistor R2, and the emitting electrode of the triode Q1 is grounded. When the ac crosses zero, transistor Q1 outputs a pulse signal at the collector to control circuit 230.
In some embodiments, the signal processing element is a MOS transistor. Specifically, as shown in fig. 4, the zero point detection circuit 210 includes a rectifier, a MOS transistor Q2, a resistor R1, and a resistor R2. One end of the rectifier is used for receiving an alternating current signal, the other end of the rectifier is connected with the grid electrode of the MOS tube Q2 through a resistor R1, the drain electrode of the MOS tube Q2 is connected with the control circuit 230, the VCC power supply is connected through a resistor R2, and the source electrode of the MOS tube Q2 is grounded. When the alternating current crosses zero, the MOS transistor Q2 outputs a pulse signal at the drain to the control circuit 230.
In some embodiments, the zero point detecting circuit 210 further includes a voltage divider circuit and a comparator circuit, wherein one end of the voltage divider circuit is connected to the ac loop, the other end of the voltage divider circuit is connected to the comparator circuit, and the other end of the comparator circuit is connected to the control circuit. The voltage division circuit can be formed by connecting resistors in series, the zero point detection circuit divides voltage in the alternating current loop through the voltage division circuit and outputs a small signal after voltage division to the comparison circuit, and therefore the comparison circuit outputs a zero point detection signal to the control circuit. In some embodiments, the comparison circuit may be integrated in the control circuit.
Further, the on-off detection circuit 220 includes a sampling circuit and a load, the load is used for connecting the on-off device 240, the on-off device 240 is connected in a power supply loop of the load, one end of the sampling circuit is connected to the load, and the other end of the sampling circuit is connected to the control circuit 230, so as to sample a voltage signal of the load and output the voltage signal to the control circuit 230.
In this embodiment, the load may be an indicator light L1, which saves cost. The sampling circuit may actually be constituted by a voltage dividing circuit. In this embodiment, the sampling circuit includes a resistor R3 and a resistor R4. The two ends of the indicator light L1 are respectively connected to an interface of the control circuit 230, which may be an Analog-to-Digital Converter (Analog-to-Digital Converter) interface. The resistor R3 is connected between the indicator light L1 and the control circuit 230, and the resistor R4 is connected between the interfaces of the control circuit 230, and plays a role in voltage division and sampling. The indicator lamp L1 is also used to connect the on-off device 240, and the on-off device 240 is connected in the power supply loop of the indicator lamp L1. The voltage across the indicator light L1 changes each time the on-off device 240 is actuated (contact pull-in and off), so that the interface of the control circuit 230 can collect the corresponding voltage and calculate the actuation time, bounce time and zero point information of the on-off device 240. The on-off detection circuit 220 provided by the embodiment has a simple structure and low requirements on components, and can easily meet the design requirements of the circuit. In addition, because the current and voltage states at the closing and opening moments of the on-off device 240 are influenced by the load used by the user in actual conditions, the load in the on-off detection circuit 220 can simulate the opening and closing conditions of the on-off device 240 under the condition that the user actually demands the load, and the detection precision is improved. In some embodiments, the on-off detection circuit 220 may not include a load.
In some embodiments, the on-off detection circuit 220 may be an oscilloscope. The action time and the rebound time of the on-off device 240 can be calculated more accurately by the oscilloscope, and the oscilloscope can directly input the action time and the rebound time of the on-off device 240 to the control circuit 230.
In this embodiment, the control circuit 230 may be a Micro Controller Unit (MCU). The control circuit 230 has a plurality of I/O interfaces, and the on-off device 240, the zero point detection circuit 210, and the on-off detection circuit 220 are respectively connected to one or more I/O interfaces of the control circuit 230.
The control circuit 230 is used for controlling the on-off device 240 to perform a plurality of on-off tests, and counting a plurality of test action times in the plurality of on-off tests. The control circuit 230 calculates an average value of the plurality of test operation times, and uses the average value of the plurality of test operation times as a calculated value of the final operation time for determining the output timing of the control signal. Each on-off test of the on-off device 240 is controlled by a control signal of the control circuit 230, and each on-off test comprises a plurality of actions (pull-in or pull-off). Specifically, in order to make the finally calculated action time more accurate, the control circuit 230 controls the on-off device 240 to perform multiple on-off tests, and counts a plurality of test action times of the on-off device 240 for the multiple on-off tests according to the action signal output by the on-off detection circuit 220 in each on-off test of the on-off device 240, and calculates an average value of the plurality of test action times. Since the plurality of on-off tests are performed in a continuous time, there is not a large difference between the plurality of test operation times counted by the plurality of on-off tests, and therefore, the average value of the plurality of test operation times may be used as the calculated value of the final operation time. The average value of the action time obtained through multiple on-off tests can be more accurate than the action time obtained through a single on-off test.
Further, the control circuit 230 is further configured to count a plurality of bounce times in a plurality of on-off tests, calculate an average value of the bounce times, and use the average value of the bounce times as a calculated value of a final bounce time for determining an output time of the control signal. Specifically, in order to make the finally calculated rebound time more accurate, the control circuit 230 counts a plurality of test rebound times of the on-off device 240 for a plurality of on-off tests according to the action signal output by the on-off detection circuit 220 in each on-off test of the on-off device 240, and calculates an average value of the plurality of test rebound times. In fact, the bounce action of the on-off device 240 is affected by the elastic force of the mechanical spring, so that the counted test bounce times are different from the counted test bounce times. In general, since a plurality of test jump times counted in a continuous time are normally distributed, in order to accurately obtain a calculated value of a final jump time, the control circuit 230 may obtain a test jump time in the middle of the normal distribution among the plurality of normally distributed test jump times, and use the test jump time as the calculated value of the final jump time. The rebound time obtained through multiple on-off tests can be more accurate than that obtained through a single on-off test.
It should be noted that, in order to make the use of the user more convenient and experience better. The calculated value of the actuation time and the calculated value of the rebound time may be obtained by a worker performing an on-off test before the on-off device 240 leaves a factory. The calculated value of the operation time and the calculated value of the rebound time are acquired and stored in the control circuit 230. The control circuit 230 may be an MCU including a memory. When the user uses the on/off device 240, the control circuit 230 determines the output timing of the control signal for controlling the operation of the on/off device 240 based on the calculated value of the operation time and the calculated value of the bounce time.
Further, after determining the calculated value of the operation time and the calculated value of the bounce time, the control circuit 230 determines the output timing of the control signal according to the calculated value of the operation time, the calculated value of the bounce time, and the zero-point period of the ac power signal. Specifically, the control circuit 230 determines and stores the zero-point delay time according to the calculated value of the action time, the calculated value of the bounce time, and the zero-point period, and determines the output time of the control signal according to the zero-point time and the zero-point delay time, so that the middle time of the bounce time coincides with the next zero-point time.
The zero-point delay time represents a delay time during which the control circuit 230 starts delaying at the zero-point time of the ac electric signal. The control circuit 230 may store the calculated zero delay time in memory. And when the user uses the on-off device 240, delaying one zero-point delay time output control signal after the zero-point delay time of the alternating current signal. Wherein the zero-point delay time is obtained by the following formula:
Tzero point delay＝TZero point-(TMovement of+1/2TJump back)；
Wherein, TZero point delayZero delay time; t isZero pointIs a zero period; t isMovement ofThe calculated value of the action time; t isJump backCalculated as the bounce time.
After the control circuit 230 saves the zero-point delay time, when the user uses the on-off device 240, the control circuit 230 may output a control signal based on the zero-point delay time. As shown in fig. 5, a diagram illustrating the timing of the output of the control signal is shown. Wherein T1 represents a zero-point period; t2 represents the zero point delay time; t3 represents an action time; t4 denotes a jump back time; t1 is the output time of the control signal; t2 is the first action time of the on-off device 240; t0 and t3 are zero-point moments; t4 is the time of the complete operation of the on/off device 240. Since the control circuit 230 can calculate each zero point time of the alternating current based on the zero point detection signal, when the zero point time T0 of the alternating current signal is reached, the control circuit 230 starts delaying and outputs the control signal at T1 after the zero point delay time T2, and at this time, the on-off device 240 passes the next zero point time T3 of the alternating current signal just in the middle of the bounce time T4 after the operation time T3. The time t2 is the initial time of the rebound time due to the first action (first pull-in or pull-off) of the on-off device 240; the time T4 when the on/off device 240 is fully actuated (fully engaged or disengaged) is the end of the bounce time, so all the on/off actions of the on/off device 240 occur within the bounce time T4. And the middle moment of the rebound time of the on-off device 240 just passes through the zero point of the alternating current, so that the average voltage difference between two ends of the contact in the whole rebound process of the on-off device 240 is minimum, the voltage of the contact of the on-off device 240 is effectively inhibited, and the contact adhesion caused by the arc generated by the on-off device 240 is avoided.
In some embodiments, the actual actuation time and the actual bounce time of the on-off device 240 are affected with minor changes as the on-off device 240 ages gradually with increasing operating time. Therefore, the control circuit 230 may further re-determine the zero-point delay time according to the preset interval time, and replace the current zero-point delay time with the re-determined zero-point delay time. Specifically, the control circuit 230 re-determines the calculated value of the action time and the calculated value of the bounce time according to the preset interval time, and replaces the calculated value of the current action time and the calculated value of the current bounce time with the calculated value of the action time and the calculated value of the bounce time after re-determination.
Further, the control circuit 230 re-determines the zero point period of the ac electrical signal, re-determines the zero point delay time according to the re-determined zero point period, the calculated value of the re-determined action time, and the calculated value of the re-determined rebound time, and replaces the current zero point delay time with the re-determined zero point delay time for calibration. The specific calibration method is consistent with the above method, and is not described in detail.
The voltage suppression device based on the zero-crossing detection is provided with a zero-point detection circuit, an on-off detection circuit and a control circuit, and detects the zero point of an alternating current signal through a part detection circuit; the on-off state of the on-off device is detected through the on-off detection circuit, so that the control circuit can calculate the zero point time of an alternating current point signal and the action time and the rebound time of the on-off device, and the control circuit determines the output time of a control signal according to the action time, the rebound time and the zero point time, so that the on-off device is overlapped with the next zero point time at the middle time of the rebound time, therefore, the average voltage difference of contacts of the on-off device in the rebound process can be minimized, the voltage of the on-off device during the action of the contacts is effectively restrained, and the contact adhesion caused by the generation of electric arcs by the on-off device is avoided.
As shown in fig. 6, the embodiment of the present application further provides a voltage suppression method 300 based on zero-crossing detection. The voltage suppressing method 300 includes the following steps S1 to S3.
Step S1: the zero point time of the alternating current signal is determined.
In this embodiment, the zero point time of the alternating current signal can be determined by detecting the zero crossing point of the alternating current signal, and the zero point time of the next cycle of the alternating current signal is calculated.
Step S2: and acquiring an action signal of the on-off device, and determining action time and rebound time from the output of the control signal to the action of the on-off device according to the action signal.
In this embodiment, the on-off device is operated (closed or opened) by outputting a control signal to the on-off device. Because the contact of the on-off device is a mechanical elastic sheet, and the on-off device needs a process of action of the mechanical elastic sheet from receiving a control signal to attracting or disconnecting the contact, an action time exists between the output of the control signal and the first attracting or first disconnecting of the on-off device, and after the on-off device is attracted or disconnected for the first time, the elastic sheet contact of the on-off device can rebound for many times until the contact is stably attracted or stably disconnected, so that the on-off device has a rebound time from the first attracting to the complete attracting or from the first disconnecting to the complete disconnecting. The action time from the sending of the control signal to the first action of the on-off device and the rebound time from the first action to the complete action of the on-off device can be calculated according to the time for receiving the action signal for the first time and the time for receiving the action signal for the last time.
Step S3: and determining the output time of the control signal according to the action time, the rebound time and the zero time, so that the middle time of the rebound time after the control signal is output next time is coincided with the zero time of the alternating current signal.
In this embodiment, the control signal is output in a delayed manner when the zero point time arrives according to the action time and the rebound time, so that the middle time of the rebound time is exactly coincident with the next zero point time. Because the middle moment of contact point rebound is just zero-crossing point, the average voltage difference at two ends of the contact point can be minimum in the whole process of contact point rebound. It should be noted that, since the first time the contact is operated is the initial time of the bounce process, the average voltage difference is calculated to include the voltage difference at the first time the contact is operated. Therefore, the average voltage difference of the contacts of the on-off device in the whole action process can be minimized, so that the voltage of the on-off device when the contacts are attracted is effectively restrained, and the contact adhesion caused by electric arc generated by the on-off device is avoided.
According to the voltage suppression method based on the zero-crossing detection, the zero-point time of the alternating current signal is determined, the action signal of the on-off device is obtained, the action time and the rebound time from the output of the control signal to the action of the on-off device are determined according to the action signal, and the output time of the control signal is determined according to the action time, the rebound time and the zero-point time, so that the middle time of the rebound time is coincident with the next zero-point time. The average voltage difference of the contacts of the on-off device in the rebound process can be minimized, so that the voltage of the contacts of the on-off device during action is effectively restrained, and the contacts are prevented from being adhered due to electric arcs generated by the on-off device.
The embodiment of the present application further provides a computer-readable storage medium, in which a program code is stored, and the program code can be called by a processor to execute the method described in the above method embodiment.
The storage medium may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. Optionally, the storage medium comprises a non-transitory computer-readable storage medium REC medium. The storage medium has a storage space for program code for performing any of the method steps of the above-described method. The program code can be read from or written to one or more computer program products. The program code may be compressed, for example, in a suitable form.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A voltage suppression device based on zero-crossing detection, the voltage suppression device comprising:
a zero point detection circuit for detecting a zero point of the alternating current signal and outputting a zero point detection signal;
the on-off detection circuit is used for connecting the on-off device, detecting the on-off state of the on-off device and outputting an action signal of the on-off device in the on-off state; and
the control circuit is connected with the zero point detection circuit and the on-off detection circuit, the control circuit is used for connecting the on-off device and outputting a control signal to the on-off device, wherein the control circuit is used for:
determining the zero point moment of the alternating current signal according to the zero point detection signal;
determining action time and rebound time from the control signal output to the action of the on-off device according to the action signal; and
and determining the output time of the control signal according to the action time, the rebound time and the zero time, so that the middle time of the rebound time after the control signal is output next time is coincident with the zero time of the alternating current signal.
2. The voltage suppression device based on zero-crossing detection as claimed in claim 1, wherein the control circuit is configured to control the switching device to perform multiple switching tests, count multiple test action times in the multiple switching tests, and calculate an average value of the multiple test action times, and use the average value of the test action times as the action time for determining the output time of the control signal.
3. The voltage suppression device based on zero-crossing detection as claimed in claim 2, wherein the control circuit is configured to control the on-off device to perform a plurality of on-off tests, count a plurality of test bounce times in the plurality of on-off tests, calculate an average value of the plurality of test bounce times, and use the average value of the plurality of test bounce times as the bounce time for determining the output time of the control signal.
4. The zero-crossing detection based voltage suppression device of claim 3, wherein the control circuit is configured to determine a zero-point period of the zero-point time according to the zero-point detection signal, and determine and store a zero-point delay time according to the action time, the rebound time, and the zero-point period; the control circuit is also used for determining the output time of the control signal according to the zero time and the zero time delay time, so that the middle time of the rebound time after the control signal is output next time is coincident with the zero time of the alternating current signal.
5. The zero-crossing detection based voltage suppression apparatus of claim 4, wherein the control circuit outputs the control signal with a delay of one zero-point delay time after the zero-point time is passed; wherein the zero-point delay time may be determined by the following equation:
Tzero point delay＝TZero point-(TMovement of+1/2TJump back) (ii) a Wherein, TZero point delayThe zero point delay time is obtained; t isZero pointIs the zero period; is TMovement ofA calculated value of the action time; t isJump backIs the calculated value of the rebound time.
6. The zero-crossing detection based voltage suppression device of claim 5, wherein the control circuit is configured to re-determine the zero-point delay time according to a preset interval time, and replace the current zero-point delay time with the re-determined zero-point delay time.
7. A voltage suppression device based on zero-crossing detection according to any one of claims 1 to 6, wherein the zero-crossing detection circuit comprises a rectifier and a signal processing element, wherein one end of the rectifier is used for receiving an alternating current signal, one end of the rectifier is connected with the signal processing element, and the other end of the signal processing element is connected with the control circuit and outputs a zero-crossing detection signal.
8. The voltage suppression device based on zero-crossing detection as claimed in claim 7, wherein the signal processing element comprises any one or more combination of a triode, a MOS tube, a thyristor and an optical coupling element.
9. The voltage suppression device based on zero crossing detection according to any one of claims 1 to 6, wherein the zero point detection circuit comprises a voltage division circuit and a comparison circuit, one end of the voltage division circuit is connected to the AC loop, the other end of the voltage division circuit is connected to the comparison circuit, and the other end of the comparison circuit is connected to the control circuit.
10. The voltage suppression device based on zero crossing detection according to any one of claims 1 to 6, wherein the on-off detection circuit comprises a sampling circuit and a load, the load is used for connecting the on-off device, the on-off device is connected in a power supply loop of the load, one end of the sampling circuit is connected with the load, and the other end of the sampling circuit is connected with the control circuit, so as to sample a voltage signal of the load and output the voltage signal to the control circuit.
11. A method of voltage suppression based on zero crossing detection, the method comprising:
determining the zero point moment of the alternating current signal;
acquiring an action signal of the on-off device, and determining action time and rebound time from the output of a control signal to the action of the on-off device according to the action signal; and
and determining the output time of the control signal according to the action time, the rebound time and the zero time, so that the middle time of the rebound time after the control signal is output next time is coincident with the zero time of the alternating current signal.
12. A computer-readable storage medium storing program instructions, which when executed by a processor implement the method of claim 11.
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