CN214591355U - PWM control system based on phase sequence offset for rail transit - Google Patents
PWM control system based on phase sequence offset for rail transit Download PDFInfo
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- CN214591355U CN214591355U CN202120271300.9U CN202120271300U CN214591355U CN 214591355 U CN214591355 U CN 214591355U CN 202120271300 U CN202120271300 U CN 202120271300U CN 214591355 U CN214591355 U CN 214591355U
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Abstract
The utility model discloses a track traffic is with PWM control system based on phase sequence skew, include: the phase sequence deviation control circuit comprises an MCU unit, a GPIO/PWM control port, a phase sequence deviation unit and an output unit, wherein the MCU unit is in signal connection with one end of the phase sequence deviation unit through the GPIO/PWM control port, the other end of the phase sequence deviation unit is in signal connection with the output unit, the phase sequence deviation unit sets corresponding parameters according to actual requirements and staggers PWM output peak values of all paths at an initial position, then the signals are transmitted to an output module, and the output module outputs corresponding PWM waves. In this way, the utility model discloses transfinite phenomenon when the PWM control system for the track traffic based on phase sequence skew can avoid multichannel PWM output has greatly improved the stability and the life-span of product, improves the utilization efficiency of full period power.
Description
Technical Field
The utility model relates to a track traffic electrical technology field especially relates to a track traffic is with PWM control system based on phase sequence skew.
Background
At present, in many aspects of rail transit, such as illumination and the like, multiple paths of PWM (pulse width modulation) are required to be output simultaneously so as to achieve the aim of diversified control.
However, in the process of simultaneously starting multiple paths of loads, particularly in the peak stage of a PWM control loop, there are phenomena such as overload and overcurrent caused by instantaneous power consumption exceeding the rated design due to the simultaneous starting of multiple paths of PWM peaks.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a PWM control system based on phase sequence skew for track traffic, transfinites the phenomenon when can evading multichannel PWM output, has greatly improved the stability and the life-span of product, improves the utilization efficiency of full period power.
In order to solve the technical problem, the utility model discloses a technical scheme be: provided is a phase sequence offset-based PWM control system for rail transit, comprising: MCU unit, GPIO/PWM control port, phase sequence offset unit and output unit,
the MCU unit is in signal connection with one end of the phase sequence deviation unit through the GPIO/PWM control port, the other end of the phase sequence deviation unit is in signal connection with the output unit,
the phase sequence offset unit sets corresponding parameters according to actual requirements, staggers each path of PWM output peak values at the initial position, then transmits signals to the output module, and the output module outputs corresponding PWM waves.
In a preferred embodiment of the present invention, the phase sequence deviation unit comprises a phase sequence judging module and a PWM algorithm module, the MCU unit is connected to the input of the phase sequence judging module, the output of the phase sequence judging module is connected to the input of the PWM algorithm module, and the output of the PWM algorithm module is connected to the output unit.
In a preferred embodiment of the present invention, the PWM output peak is PWM duty cycle data.
In a preferred embodiment of the present invention, the PWM algorithm module employs a periodic algorithm.
In a preferred embodiment of the present invention, the PWM algorithm module sets the corresponding parameters according to the phase sequence offset of each channel initialized in the phase sequence offset unit and the duty ratio of 100% of each channel initialized.
In a preferred embodiment of the present invention, the output module outputs the corresponding PWM wave according to the required duty ratio.
The utility model has the advantages that: the utility model discloses transfinite phenomenon when the PWM control system based on phase sequence skew for the track traffic can avoid multichannel PWM output has greatly improved the stability and the life-span of product, improves the utilization efficiency of full period power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings 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 invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
fig. 1 is a schematic structural diagram of a preferred embodiment of a phase sequence offset-based PWM control system for rail transit according to the present invention;
fig. 2 is a diagram of the non-phase-shifted PWM control peak in practical application of the present invention;
fig. 3 is a diagram of the PWM control peak after the two-way phase shift in practical application of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 to 3, an embodiment of the present invention includes:
the utility model provides a PWM control system based on phase sequence skew for track traffic, includes MCU unit, GPIO/PWM control port, phase sequence skew unit and output unit, and the MCU unit passes through GPIO/PWM control port and phase sequence skew unit's one end signal connection, and phase sequence skew unit's the other end and output unit signal connection.
The phase sequence offset unit sets corresponding parameters according to actual requirements, staggers each path of PWM output peak values at an initial position, then transmits signals to the output module, and the output module outputs corresponding PWM waves according to the required duty ratio. And the PWM output peak value is PWM duty ratio data.
Furthermore, the phase sequence deviation unit comprises a phase sequence judgment module and a PWM algorithm module, the MCU unit is connected with the input end of the phase sequence judgment module, the output end of the phase sequence judgment module is connected with the input end of the PWM algorithm module, and the output end of the PWM algorithm module is connected with the output unit.
The PWM algorithm module is formed by combining PMV parameter equations, and sets corresponding parameters according to the phase sequence offset for initializing each channel in the phase sequence offset unit and the 100% duty ratio for initializing each channel.
Under normal conditions, two paths of PWM are simultaneously output, and the total power can exceed 100% within 0-1/4T, which can cause circuit overload;
adopt the utility model discloses a track traffic is with PWM control system based on phase sequence skew, second way PWM is 180 degrees mutually partially, then in whole cycle, total power all probably not exceed 100%, reaches protection circuit's effect.
The utility model discloses track traffic is with PWM control system based on phase sequence skew's beneficial effect is:
the original circuit with the MCU can be modified without new manufacture, so that the cost is reduced;
the phenomenon of overrun during multi-path PWM output can be avoided, the stability and the service life of a product are greatly improved, and the utilization efficiency of a full-time power supply is improved;
the power supply has been successfully applied to the centralized power supply of E55 and E43A train platforms.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.
Claims (6)
1. A phase sequence offset based PWM control system for rail traffic, comprising: MCU unit, GPIO/PWM control port, phase sequence offset unit and output unit,
the MCU unit is in signal connection with one end of the phase sequence deviation unit through the GPIO/PWM control port, the other end of the phase sequence deviation unit is in signal connection with the output unit,
the phase sequence offset unit sets corresponding parameters according to actual requirements, staggers each path of PWM output peak values at the initial position, then transmits signals to the output module, and the output module outputs corresponding PWM waves.
2. The phase sequence offset-based PWM control system for rail transit according to claim 1, wherein the phase sequence offset unit comprises a phase sequence judgment module and a PWM algorithm module, the MCU unit is connected with an input end of the phase sequence judgment module, an output end of the phase sequence judgment module is connected with an input end of the PWM algorithm module, and an output end of the PWM algorithm module is connected with the output unit.
3. The phase sequence offset based PWM control system for rail transit of claim 2, wherein the PWM output peak value is PWM duty cycle data.
4. The phase sequence offset based PWM control system for rail transit of claim 3, wherein the PWM algorithm module employs a periodic algorithm.
5. The phase sequence offset-based PWM control system for rail transit according to claim 4, wherein the PWM algorithm module sets corresponding parameters according to the phase sequence offset for initializing each channel in the phase sequence offset unit and the duty ratio of 100% for initializing each channel.
6. The phase sequence offset-based PWM control system for rail transit of claim 1, wherein the output module outputs the corresponding PWM wave according to a desired duty ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120271300.9U CN214591355U (en) | 2021-02-01 | 2021-02-01 | PWM control system based on phase sequence offset for rail transit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120271300.9U CN214591355U (en) | 2021-02-01 | 2021-02-01 | PWM control system based on phase sequence offset for rail transit |
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| CN214591355U true CN214591355U (en) | 2021-11-02 |
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| CN202120271300.9U Active CN214591355U (en) | 2021-02-01 | 2021-02-01 | PWM control system based on phase sequence offset for rail transit |
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2021
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