CN105958433B - A relay zero-crossing detection and calibration method and device - Google Patents

Abstract

The invention discloses a kind of detection of relay zero-crossing, calibration method and devices.Wherein, relay zero-crossing detection method, comprising: in relay conducting, the voltage-phase of control relay controlled terminal；Obtain the time interval of the adjacent zero passage twice of voltage-phase；The zero passage that time interval is sent to relay is calibrated into side.The present invention detects relay by the way that individual zero crossing detection device is arranged, and product circuit itself is not required, while without screening again to relay, can effectively save the research and development time of product, reduce the production cost of product.

Description

A relay zero-crossing detection and calibration method and device

technical field

The invention relates to the technical field of relay control, in particular to a relay zero-crossing detection and calibration method and device.

Background technique

With the development of the smart home industry, home smart products are becoming more and more diverse. Controlling lights and curtains through mobile phones has appeared in ordinary people's homes. Ordinary mechanical switches for controlling lights can no longer meet the requirements, so smart switches have emerged. Intelligent switch control loads generally use relays as switches to control their on-off. Ordinary resistive or inductive loads such as light bulbs, energy-saving lamps, and curtain motors are no problem. But now that LED energy-saving lamps appear, because they are capacitive loads, when the load is turned on, the surge current has a very large impact on the relay contacts. After switching several times, the relay contacts will be damaged, causing the relay to stick and fail to switch normally. lights or curtains.

At present, most of the relays are added by adding a zero-crossing detection circuit. By detecting the zero-crossing point, the relay is turned on at the zero-crossing point, so as to prevent the relay contact from being damaged by a large current impact. However, the existing zero-crossing detection methods have certain limitations: first, the product circuit itself has errors, resulting in inaccurate detection; second, the action time of the relay conduction is different, and the zero-crossing conduction time cannot be accurately determined. Therefore, if the zero-crossing detection circuit wants to reduce the error of zero-crossing detection, one needs to improve the accuracy of the product circuit, and the other is to accurately screen the relay. However, these two methods are difficult to operate in practice, are very time-consuming and lead to a significant increase in the production cost of the product. Therefore, the use of the zero-crossing detection circuit cannot effectively solve the problem of the current impact of the conduction on the relay.

Contents of the invention

The technical problem to be solved by the present invention is to provide a relay zero-crossing detection and calibration method and device to solve the problem in the prior art that the relay is easily damaged by surge current when it is turned on.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions.

According to one aspect of the present invention, a relay zero-crossing detection method is provided, which is used in the zero-crossing detection side, including:

When the relay is turned on, detecting the voltage phase of the controlled terminal of the relay;

Obtain the time interval between two adjacent zero-crossings of the voltage phase;

The time interval is sent to the zero-crossing calibration side of the relay.

Further, the zigbee wireless communication protocol is used to send the time interval to the zero-crossing calibration side of the relay.

According to one aspect of the present invention, a relay zero-crossing calibration method is provided, which is used on the zero-crossing calibration side, including:

The time interval between two adjacent zero-crossing phases of the voltage phase of the controlled terminal when the relay sent by the zero-crossing detection side is turned on;

The time interval is compared with a preset threshold, and the zero-crossing time of the relay is calibrated according to the comparison result.

Further, the zigbee wireless communication protocol is used to receive the time interval between two adjacent zero-crossing phases of the controlled terminal voltage.

Further, the calibration of the zero-crossing time of the relay according to the comparison result includes:

calculating the difference between the time interval and the preset threshold;

When the time interval is greater than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, advance the time point when the second voltage phase of the relay is zero by the difference value ;

When the time interval is less than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, delaying the time point when the second voltage phase of the relay is zero by the difference value .

Further, when calibrating the zero-crossing time of the relay according to the comparison result, the method further includes: storing the time interval when the time interval is equal to the preset threshold.

According to one aspect of the present invention, a relay zero-crossing detection device is provided, including:

a detection unit, configured to detect the voltage phase of the controlled terminal of the relay when the relay is turned on;

An acquisition unit, configured to acquire the time interval between two adjacent zero-crossings of the voltage phase;

A sending unit, configured to send the time interval to the zero-crossing calibration side of the relay.

Further, the sending unit uses the zigbee wireless communication protocol to send the time interval to the zero-crossing calibration side of the relay.

According to one aspect of the present invention, a relay zero-crossing calibration device is provided, including:

The receiving unit is used to receive the time interval between two adjacent zero-crossing voltage phases of the controlled terminal when the relay sent by the zero-crossing detection side is turned on;

a comparison unit, configured to compare the time interval with a preset threshold;

The calibration unit is used to calibrate the zero-crossing time of the relay according to the comparison result.

Further, the receiving unit adopts the zigbee wireless communication protocol to receive the time interval between two adjacent zero crossings of the voltage phase of the controlled terminal.

Further, the calibration unit is specifically used for:

calculating the difference between the time interval and the preset threshold;

When the time interval is greater than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, advance the time point when the second voltage phase of the relay is zero by the difference value ;

When the time interval is less than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, delaying the time point when the second voltage phase of the relay is zero by the difference value .

Further, the device further includes a storage unit, configured to store the time interval when the time interval is equal to the preset threshold.

The present invention has the following beneficial effects:

The relay zero-crossing detection and calibration method and device provided by the embodiments of the present invention only need to add a zero-crossing detection device to detect the zero-crossing time of each load when the relay operates through the zero-crossing detection device; The time interval between two adjacent voltage phases being zero is sent to the smart electronic product through the zigbee wireless communication protocol; the smart electronic product judges whether the zero-crossing time is accurate according to the zero-crossing time interval, and adjusts to the accurate zero-crossing point. The invention can effectively avoid the surge current of the relay contact without improving the circuit precision and screening the relay, so that the relay is protected and its service life is increased; by configuring an independent detection circuit, the production of the product can be effectively reduced cost.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the specific embodiments of the present invention are enumerated below.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the flow chart of relay zero-crossing detection method in the embodiment of the present invention;

Fig. 2 is the flow chart of the relay zero-crossing calibration method in the embodiment of the present invention;

Fig. 3 is the structural block diagram of relay zero-crossing detection device in the embodiment of the present invention;

4 is a schematic diagram of a circuit structure of a relay zero-crossing detection device in an embodiment of the present invention;

Fig. 5 is the schematic diagram of the circuit structure of the relay in the product in the embodiment of the present invention;

Fig. 6 is a structural block diagram of a relay zero-crossing calibration device in an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

An embodiment of the present invention provides a relay zero-crossing detection method for the zero-crossing detection side, see Figure 1, which specifically includes the following steps:

Step 101, when the relay is turned on, detect the voltage phase of the controlled terminal of the relay;

In this step, the zero-crossing detection side detects the voltage at both ends of the controlled terminal (that is, the output terminal) of the relay, which can effectively avoid errors caused by the delay of the relay itself. Therefore, by detecting the voltage phase of the controlled terminal of the relay, it is not necessary to consider the delay of the relay itself, and only need to obtain the voltage of the output terminal of the relay.

Step 102, acquiring the time interval between two adjacent zero crossings of the voltage phase.

In this step, when obtaining the zero-crossing time interval, first when receiving the relay on-off control command (that is, when the switch is turned on), detect the zero time t0 when the voltage phase of the relay is zero; then detect when the relay is turned on, The zero-crossing time t1 at which the voltage phase is zero. Calculate the zero-crossing time interval T=t1-t0.

Step 103, sending the time interval to the zero-crossing calibration side of the relay.

In this step, the zero-cross detection side is an independent device. After the zero-crossing detection side obtains the time interval between two adjacent zero-crossings of the voltage phase, the time interval is sent to the zero-crossing calibration side of the relay, and the detection of the zero-crossing time point when the subsequent relay is turned on is stopped.

Usually the zero-crossing calibration side is located in the smart electronics. At present, smart electronic products can usually realize wireless control, so the zero-crossing detection side also adopts a wireless method to send the time interval to the zero-crossing calibration side. Specifically, bluetooth, wifi, zigbee, etc. can be used. In the embodiment of the present invention, the zigbee wireless communication protocol is preferably adopted. The Zigbee protocol has short propagation distance, low power consumption, low cost, and simple protocol, which can effectively reduce the cost of the zero-crossing detection side and ensure reliable data transmission.

The relay zero-crossing detection method provided by the embodiment of the present invention detects the voltage phase of the controlled terminal of the relay without considering the action time of the relay itself being turned on. According to the time interval between two zero-crossings, the zero-crossing calibration side can realize the Zero calibration. Therefore, the embodiment of the present invention detects the relay by setting a separate zero-crossing detection device, which does not require the product circuit itself, and does not need to screen the relay, which can effectively save product development time and reduce product production costs.

Example 2

The embodiment of the present invention also provides a relay zero-crossing calibration method for the zero-crossing calibration side, see Figure 2, which specifically includes the following steps:

Step 201 , receiving the time interval between two adjacent zero-crossing phases of the voltage phase of the controlled terminal when the relay is turned on from the zero-crossing detection side.

In this step, wireless communication protocols such as bluetooth, wifi, and zigbee can be used on the zero-crossing calibration side. The zigbee wireless communication protocol is preferably used to reduce product costs and ensure reliable data transmission. Smart electronic products through the zigbee communication protocol make the product not limited by the number of live wires, neutral wires, and channels, and the remote control of the product can be realized through smart devices, which is convenient for realizing home intelligence.

Step 202, comparing the time interval with a preset threshold, and calibrating the zero-crossing time of the relay according to the comparison result.

In the embodiment of the present invention, a standard 50HZ AC waveform is usually used, the full-wave period is 20ms, and the half-wave period is 10ms. That is, the time interval between two zero-crossing points is 10ms. Therefore, in the embodiment of the present invention, the preset threshold is 10 ms, and the zero-crossing time interval is compared with 10 ms. Based on the compared difference, the zero-crossing time of the relay is calibrated.

When calibrating the zero-crossing time of the relay according to the comparison result, the specific steps are as follows:

Calculate the difference between the zero-crossing time interval and the preset time threshold;

When the time interval is greater than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, advance the time point when the second voltage phase of the relay is zero by the corresponding difference;

When the time interval is less than the preset threshold, after detecting the time point when the relay voltage phase is zero for the first time, delay the time point when the relay voltage phase is zero for the second time by a corresponding difference;

When the time interval is equal to the preset threshold value, the time interval is stored in the electronic product as the time interval of the zero crossing when the relay is turned on, and at the same time, it prompts that the calibration is successful.

The zero-crossing detection and calibration method provided by the embodiment of the present invention uses a zero-crossing detection device to detect the zero-crossing time of each load when the relay operates; The zigbee wireless communication protocol will be sent to the smart electronic product; the smart electronic product judges whether the zero-crossing time is accurate according to the zero-crossing time interval, and adjusts to the accurate zero-crossing point. The invention can effectively avoid the surge current of the relay contacts without improving the circuit precision and screening the relays, so that the relays are protected. In addition, the present invention does not need to change the design of the hardware circuit, thereby reducing the hardware cost.

Example 3

Referring to Fig. 3, the embodiment of the present invention also provides a relay zero-crossing detection device, including:

The detection unit is used to detect the voltage phase of the controlled terminal of the relay when the relay is turned on;

An acquisition unit, configured to acquire the time interval between two adjacent zero-crossings of the voltage phase;

Sending unit for sending the time interval to the zero-crossing calibration side of the relay.

Further, the sending unit uses the zigbee wireless communication protocol to send the time interval to the zero-crossing calibration side of the relay. In the embodiment of the present invention, the zigbee wireless communication protocol is preferably adopted. The Zigbee protocol has short propagation distance, low power consumption, low cost, and simple protocol, which can effectively reduce the cost of the zero-crossing detection side and ensure reliable data transmission.

Further, the circuit diagram of the relay zero-crossing detection device is shown in FIG. 4 , which can realize the zero-crossing detection of the relays K1 and K2 in the product in FIG. 5 . In Fig. 4, the zero-crossing detection of two relays can be realized, and the zero-crossing detection of relay K1 is taken as an example for illustration. Among them, photocoupler IC6 is connected in series with resistor R110, resistor R117, and resistor R118 to isolate 220V strong and weak current signals; resistor R110, resistor R117, and resistor R118 are 220V circuit current limiting resistors; resistor R119 is the optocoupler conduction The current limiting resistor is grounded through the photocoupler IC6; the connection point of the resistor R119 and the photocoupler IC6 is connected to the base of the transistor N115 through the resistor R141; the base of N115 is connected to the ground through the resistor R143; the resistor R143 is the conduction of the photocoupler Voltage divider resistor, capacitor C126 connected in parallel at both ends; capacitor C126 is a filter capacitor to filter out power supply interference glitches; triode N115 is for waveform shaping, emitter is grounded, and collector is connected to +5V power supply through resistor R142 to improve anti-interference; resistor R142 and Capacitor C21 is the filtering power of the signal collected by the MCU.

The relay zero-crossing detection device provided by the embodiment of the present invention detects the time interval between two adjacent voltage phases of the controlled terminal of the relay being zero, and sends it to the zero-crossing calibration side through a wireless communication protocol, and the zero-crossing calibration side realizes the zero-crossing calibration. Zero calibration. By setting a separate zero-crossing detection device to detect the relay, there is no need to configure a zero-crossing detection circuit in the electronic product, which can effectively reduce the production cost of the product.

Example 4

Referring to Figure 6, the embodiment of the present invention also provides a relay zero-crossing calibration device, including:

The receiving unit is used to receive the time interval between two adjacent zero-crossing voltage phases of the controlled terminal when the relay sent by the zero-crossing detection side is turned on;

a comparison unit, configured to compare the time interval with a preset threshold;

The calibration unit is used for calibrating the zero-crossing time of the relay according to the comparison result.

Further, the receiving unit adopts the zigbee wireless communication protocol to receive the time interval between two adjacent zero-crossing voltage phases of the controlled terminal.

Further, the calibration unit is specifically used for:

Calculate the difference between the time interval and the preset threshold;

When the time interval is greater than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, advance the time point when the second voltage phase of the relay is zero;

When the time interval is less than the preset threshold, after detecting the time point when the relay voltage phase is zero for the first time, delay the time point when the relay voltage phase is zero for the second time by a difference value.

Further, the device further includes a storage unit, configured to store the time interval when the time interval is equal to a preset threshold.

In the zero-crossing detection and calibration device provided by the embodiment of the present invention, the CPU of the intelligent electronic product itself judges whether the zero-crossing time of the relay is accurate according to the zero-crossing time interval, and adjusts to the accurate zero-crossing point. The invention can effectively avoid the surge current of the relay contacts without improving the circuit precision and screening the relays, so that the relays are protected.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the related parts, please refer to the part of the description of the method embodiment. And, as used herein, the terms "comprises," "comprising," or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, article, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element. In addition, those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium , the storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

Although the present application has been described by way of example, those skilled in the art will appreciate that there are many variations and changes in the present application without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (12)

1. A relay zero-crossing detection method, used in the zero-crossing detection side, is characterized in that, comprising: When the relay is turned on, detecting the voltage phase of the controlled terminal of the relay; Obtain the time interval between two adjacent zero-crossings of the voltage phase, including: When receiving the relay on-off control command, detect the zero time t0 when the voltage phase of the relay is zero, detect the zero-crossing time tl when the voltage phase is zero when the relay is turned on, and calculate the zero-crossing time interval T, T=t1-t0 ; The time interval is sent to the zero-crossing calibration side of the relay. 2. The method according to claim 1, characterized in that, adopting the zigbee wireless communication protocol, the time interval is sent to the zero-crossing calibration side of the relay. 3. A relay zero-crossing calibration method for the zero-crossing calibration side, characterized in that, comprising: receiving the time interval according to claim 1 sent by the zero-crossing detection side; The time interval is compared with a preset threshold, and the zero-crossing time of the relay is calibrated according to the comparison result. 4. The method according to claim 3, wherein the zigbee wireless communication protocol is used to receive the time interval between two adjacent zero-crossing phases of the controlled terminal voltage. 5. The method according to claim 3, wherein the calibration of the zero-crossing time of the relay according to the comparison result comprises: calculating the difference between the time interval and the preset threshold; When the time interval is greater than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, advance the time point when the second voltage phase of the relay is zero by the difference value ; When the time interval is less than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, delaying the time point when the second voltage phase of the relay is zero by the difference value . 6. The method according to claim 3, wherein, when calibrating the zero-crossing time of the relay according to the comparison result, further comprising: when the time interval is equal to the preset threshold, setting the The above time intervals are stored. 7. A relay zero-crossing detection device, characterized in that it comprises: a detection unit, configured to detect the voltage phase of the controlled terminal of the relay when the relay is turned on; The acquisition unit is used to acquire the time interval between two adjacent zero crossings of the voltage phase, specifically for: When receiving the relay on-off control command, detect the zero-point time t0 when the voltage phase of the relay is zero, detect the zero-crossing time tl when the voltage phase is zero when the relay is turned on, and calculate the zero-crossing time interval T, T=t1-t0 ; A sending unit, configured to send the time interval to the zero-crossing calibration side of the relay. 8. The device according to claim 7, wherein the sending unit uses the zigbee wireless communication protocol to send the time interval to the zero-crossing calibration side of the relay. 9. A relay zero-crossing calibration device, characterized in that it comprises: A receiving unit, configured to receive the time interval according to claim 7 sent by the zero-crossing detection side; a comparison unit, configured to compare the time interval with a preset threshold; The calibration unit is used to calibrate the zero-crossing time of the relay according to the comparison result. 10 . The device according to claim 9 , wherein the receiving unit uses the zigbee wireless communication protocol to receive the time interval between two adjacent zero-crossing phases of the controlled terminal voltage. 11 . 11. The device according to claim 9, wherein the calibration unit is specifically used for: calculating the difference between the time interval and the preset threshold; When the time interval is greater than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, advance the time point when the second voltage phase of the relay is zero by the difference value ; When the time interval is less than the preset threshold, after detecting the time point when the first voltage phase of the relay is zero, delaying the time point when the second voltage phase of the relay is zero by the difference value . 12. The device according to claim 9, further comprising a storage unit, configured to store the time interval when the time interval is equal to the preset threshold.