CN111147049B

CN111147049B - Pulse stopping method for avoiding spike pulse

Info

Publication number: CN111147049B
Application number: CN201911317539.9A
Authority: CN
Inventors: 宋斌; 胡伟
Original assignee: Shenzhen Samkoon Technology Corp ltd
Current assignee: Shenzhen Samkoon Technology Corp ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2023-10-27
Anticipated expiration: 2039-12-19
Also published as: CN111147049A

Abstract

The invention discloses a pulse stopping method for avoiding spike pulse, and relates to the field of pulse signals. The method comprises the following steps: setting a safety interval and a dangerous interval of a single pulse, wherein the dangerous interval is a time interval containing a falling edge; and prohibiting the stop of sending the pulse in the dangerous interval. The invention avoids the generation of spike pulse by the pulse stopping mechanism of the pulse sending end, thereby solving the problem of accumulated error caused by spike pulse in the prior art. And the pulse stopping mechanism can be adjusted according to the receiving performance of the pulse receiving end without improving the receiving performance of the pulse receiving end, so that the pulse stopping mechanism can adapt to the pulse receiving end with any performance.

Description

Pulse stopping method for avoiding spike pulse

Technical Field

The invention relates to the field of pulse signals, in particular to a pulse stopping method for avoiding spike pulses.

Background

In the manufacturing industry, stepper motors and servo motors are widely used as basic elements of numerical control machine tools, industrial robots, special equipment and the like, and a PLC, a motion controller, a numerical control system and the like are used for controlling the stepper motors and the servo motors in a pulse mode. The frequency of the pulses controls the rotation speed of the motor, and the number of the pulses controls the rotation quantity, so that the running speed and the position of the equipment are controlled. Taking a PLC as an example, the PLC is taken as a pulse sending end, a pulse is sent to an input end of a motor driver through an output pin, the input end of the motor driver judges the number of the pulse by detecting the edge of the pulse, a pulse receiving end usually detects the falling edge of the pulse, when the pulse receiving end detects a falling edge, the pulse receiving end considers that one pulse is received, and the driver drives the motor to rotate by an angle corresponding to the pulse. The pulse high and low levels respectively account for 50% in normal transmission.

In an ideal case, the pulse frequency transmitted by the pulse transmitting end is guaranteed to be lower than the highest receiving frequency of the pulse receiving end. However, in practice, the pulse transmitted by the transmitting end is controlled by a program, and there are various special cases in which when the transmitting end needs to stop the pulse transmission immediately, the pulse waveform is stopped immediately, and the stopping position is random, as shown in fig. 1, the pulse transmission is stopped immediately at the moment when the falling edge just occurs, and the level is pulled up automatically, so that a spike pulse W may be generated, and the pulse receiving end cannot receive the pulse due to the receiving characteristic of the hardware circuit, and the spike pulse which cannot be received is ignored. And even if a spike, the transmitting end considers that a pulse has been transmitted as long as it has transmitted a falling edge. This causes an error between the actual running distance of the motor and the actual transmission of the PLC, and a long running time causes an accumulated error.

In the prior art, at the pulse receiving end, no better way is provided in the industry at present to deal with the spike problem caused by the sudden stop of the pulse transmitting end. In theory, the receiving performance of the pulse receiving end is improved, and the spike pulse with the effective level width in a certain range can be received, but due to the uncertainty of the pulse stopping time, the effective level width of the spike pulse can be infinitely small, and the pulse receiving end cannot infinitely improve the receiving performance of the spike pulse due to the limitation of cost and hardware, and the improvement of the receiving performance of the pulse receiving end can also cause the reduction of anti-interference capability and the increase of cost in practical application. On the pulse transmitting side, when the pulse stop command is generated, the pulse transmitting is completed, and the pulse transmitting is not stopped immediately, so that the spike pulse is avoided. When the frequency is high, the processing mode is effective, and the time of stopping pulse lag has little influence on the system. However, when the pulse frequency is low, there is also a spike problem, and this is not applicable, for example, the pulse frequency is 1Hz, and waiting for the pulse transmission to be completed may take up to 1 second, and in pulse control, this waiting is unacceptable.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a pulse stopping method for avoiding spike pulse, which can avoid the generation of spike pulse through a pulse stopping mechanism of a pulse transmitting end.

One embodiment of the present invention provides a pulse stopping method for avoiding spike pulses, the method comprising the steps of:

setting a safety interval and a dangerous interval of a single pulse, wherein the dangerous interval is a time interval containing a falling edge;

and prohibiting the stop of sending the pulse in the dangerous interval.

The pulse stopping method for avoiding spike pulse has the following advantages: the generation of spike pulse is avoided through a pulse stopping mechanism of the pulse sending end, so that the problem of accumulated error caused by spike pulse in the prior art is solved. And the pulse stopping mechanism can be adjusted according to the receiving performance of the pulse receiving end without improving the receiving performance of the pulse receiving end, so that the pulse stopping mechanism can adapt to the pulse receiving end with any performance.

According to other embodiments of the present invention, a pulse stopping method for avoiding spike pulse, wherein the step is set in the dangerous interval to prohibit stopping of sending pulse, specifically includes:

when receiving a command for stopping sending the pulse, the pulse sending end judges the section where the current pulse is sent;

if the current pulse is in the safety interval, stopping sending the pulse;

and if the current pulse is in the dangerous interval, continuing to send the pulse until the pulse is in the safe interval, and stopping sending.

According to still further embodiments of the present invention, the safety interval includes a first safety interval and a second safety interval, and the dangerous interval is located between the first safety interval and the second safety interval.

According to other embodiments of the present invention, a pulse stopping method for avoiding spike pulse, the steps set a dangerous interval of a single pulse, specifically includes:

comparing the highest sending frequency of the pulse sending end with the highest receiving frequency of the pulse receiving end;

taking one pulse width of the smaller one to determine the width of the dangerous interval.

Drawings

FIG. 1 is a schematic diagram of a spike;

FIG. 2 is a flow chart of an embodiment of a method for pulse stopping to avoid spikes in accordance with the present invention;

fig. 3 is a schematic flow chart of step S200 in fig. 2;

fig. 4 is a schematic diagram of intervals of a single pulse at the pulse transmitting end in an embodiment of the present invention.

Detailed Description

The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" on another feature, it can be directly disposed, secured, or connected to the other feature or be indirectly disposed, secured, connected, or mounted on the other feature.

In the description of the embodiments of the present invention, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

Example 1

Referring to fig. 2, a flow chart of a pulse stopping method for avoiding spike in the present embodiment is shown.

The method comprises the following steps:

s100, setting a safety interval and a dangerous interval of a single pulse, wherein the dangerous interval is a time interval containing a falling edge;

s200, prohibiting to stop sending the pulse in the dangerous interval.

Referring to fig. 3, step S200 specifically includes:

s210, when a pulse transmission stopping request is received, the pulse transmitting end judges the interval where the current pulse is transmitted;

s220, if the current pulse is in a safe interval, stopping sending the pulse;

s230, if the current pulse is in a dangerous interval, continuing to send the pulse until the pulse is in a safe interval, and stopping sending.

In this embodiment, the safety zone includes a first safety zone and a second safety zone, and the dangerous zone is located between the first safety zone and the second safety zone.

Referring to fig. 4, a schematic diagram of intervals of a single pulse at the pulse transmitting end in the present embodiment is shown. Wherein S1 is a first safety zone, D is a dangerous zone, and S2 is a second safety zone. The dangerous section D is located between the first safe section S1 and the second safe section S2, and the first safe section S1, the dangerous section D and the second safe section S2 together form a single pulse section.

The above steps are described using the single pulse example shown in fig. 4:

step S100: setting safety intervals S1 and S2 of a single pulse and a dangerous interval D, wherein the dangerous interval D is a time interval comprising partial areas on the left side and the right side of a falling edge;

step S200: at the pulse transmitting end, the stop of transmitting the pulse, that is, the stop of the pulse, is prohibited in the dangerous section D.

Since there is a period of time for the CPU to process from the receipt of the pulse stop command to the stop of the transmission of the pulse, there may be a pulse to the left of the falling edge when the pulse stop command is received, and a pulse to the right of the falling edge when the transmission is actually stopped, which may also cause a spike. Based on this, step S200 specifically includes:

step S210: when the pulse transmitting end receives a pulse stopping instruction (or a pulse stopping instruction), the pulse transmitting end judges the section where the current pulse is transmitted;

step S220: if the current pulse is in the safety interval S1 or S2, stopping sending the pulse;

step S230: if the current pulse is in the dangerous interval D, continuing to send the pulse until the pulse is in the second safe interval S2, and stopping sending.

In this embodiment, the width of the dangerous interval D is determined by the smaller of the highest sending frequency of the pulse sending end and the highest receiving frequency of the pulse receiving end, and can be dynamically adjusted according to the performance of the dangerous interval D, i.e. the width of the dangerous interval D is a pulse width of the smaller, i.e. after the falling edge, the effective low level is ensured to be kept for a period of time, so that the pulse is prevented from being made into a spike pulse.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims

1. A pulse stopping method for avoiding spike pulse, which is applied to a pulse transmitting end, characterized in that the method comprises the following steps:

the pulse transmission is forbidden to be stopped in the dangerous interval;

the safety interval comprises a first safety interval and a second safety interval, the dangerous interval is positioned between the first safety interval and the second safety interval, and the first safety interval, the dangerous interval and the second safety interval jointly form a single pulse interval;

the step of setting a dangerous interval of a single pulse specifically comprises the following steps: comparing the highest sending frequency of the pulse sending end with the highest receiving frequency of the pulse receiving end; taking one pulse width of the smaller one to determine the width of the dangerous interval.

2. The pulse stopping method for avoiding spike pulse according to claim 1, wherein said step of prohibiting stopping of sending pulse in said dangerous interval comprises:

if the current pulse is in the safety interval, stopping sending the pulse;