CN111711346B - Drive signal updating method applied to switching tube control circuit and related device - Google Patents
Drive signal updating method applied to switching tube control circuit and related device Download PDFInfo
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- CN111711346B CN111711346B CN202010566962.9A CN202010566962A CN111711346B CN 111711346 B CN111711346 B CN 111711346B CN 202010566962 A CN202010566962 A CN 202010566962A CN 111711346 B CN111711346 B CN 111711346B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
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Abstract
The application provides a driving signal updating method applied to a switching tube control circuit and a related device, and relates to the technical field of circuit control. The drive signal updating method comprises the steps of respectively obtaining the current frequency, the expected signal frequency and the expected signal duty ratio of a drive signal corresponding to each of more than two switching tubes; respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency; based on the comparison result, the first type of driving signal and the second type of driving signal in each driving signal are determined, and the first type of driving signal and the second type of driving signal are updated respectively in different modes, so that the situation that the dead time preset on the driving signals is shortened temporarily when the driving signals are updated is prevented, the control on the switching tube is improved, and the reliability of the switching tube control circuit is effectively improved.
Description
Technical Field
The present disclosure relates to circuit control technologies, and in particular, to a method and a related apparatus for updating a driving signal applied to a switching tube control circuit.
Background
With the development of the times, people have higher and higher requirements on the fineness of circuit control, and therefore, how to better control a circuit with a plurality of switching tubes has become one of the important research points in the field.
In the existing circuit control technology for a plurality of switching tubes, in order to prevent some two or more switching tubes (for example, two switching tubes connected in a push-pull circuit in a push-pull connection) which cannot be conducted simultaneously from being conducted simultaneously, a dead time is usually set between driving signals of the switching tubes which cannot be conducted simultaneously.
The prior art has the defect that even if all the switching tube driving signals in the circuit are updated at the same time, the preset dead time is reduced briefly, so that the switching tubes which cannot be conducted at the same time are conducted at the same time in a certain period, thereby causing abnormal circuit operation or damage to circuit devices and reducing the reliability of the circuit.
Disclosure of Invention
The application provides a driving signal updating method and a related device applied to a switching tube control circuit, which can effectively improve the reliability of the switching tube control circuit.
In order to achieve the above technical effect, a first aspect of the present application provides a driving signal updating method applied to a switching tube control circuit, where the switching tube control circuit includes: the method for updating the driving signal comprises the following steps that more than two switching tubes are arranged, and the on or off of each switching tube is controlled by the driving signal, and the method for updating the driving signal comprises the following steps:
respectively acquiring the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each switching tube in the more than two switching tubes;
respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency;
if the first type of driving signal exists, updating the current frequency of the first type of driving signal to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signal to the corresponding expected signal duty ratio;
if a second type of driving signal exists, updating the current duty ratio of the second type of driving signal to the corresponding duty ratio of the expected signal, and then updating the current frequency of the driving signal to the corresponding frequency of the expected signal;
the first type of driving signal is a driving signal with a current frequency greater than a corresponding expected signal frequency, and the second type of driving signal is a driving signal with a current frequency less than a corresponding expected signal frequency.
Based on the first aspect of the present application, in a first possible implementation manner, after the obtaining the current frequency, the expected signal frequency, and the expected signal duty ratio of the driving signal corresponding to each of the two or more switching tubes, respectively, the method for updating the driving signal further includes:
respectively acquiring the switching characteristics of each switching tube in the more than two switching tubes;
determining a frequency threshold of a driving signal corresponding to each switching tube based on the switching characteristics of each switching tube;
comparing the magnitude relation between the expected signal frequency of each driving signal and the corresponding frequency threshold value;
and if the expected signal frequency of the driving signal is greater than the corresponding frequency threshold, outputting a first alarm signal.
Based on the first aspect of the present application, in a second possible implementation manner, after the obtaining the current frequency, the expected signal frequency, and the expected signal duty ratio of the driving signal corresponding to each of the two or more switching tubes, respectively, the method for updating the driving signal further includes:
respectively acquiring the switching characteristics of each switching tube in the more than two switching tubes;
determining duty ratio threshold values of driving signals corresponding to the switching tubes based on the switching characteristics of the switching tubes;
comparing the magnitude relation between the expected signal duty ratio of each driving signal and the corresponding duty ratio threshold value;
and if the expected signal duty ratio of the driving signal is larger than the corresponding duty ratio threshold value, outputting a second alarm signal.
Based on the first aspect of the present application or the first or second possible implementation manner of the first aspect of the present application, in a third possible implementation manner, the switch tube is an IGBT tube or an MOS tube.
The second aspect of the present application provides a driving signal updating apparatus applied to a switching tube control circuit, where the switching tube control circuit includes: the more than two switch tubes, and the switch-on or switch-off of each switch tube is controlled by the driving signal, the above-mentioned driving signal updating device includes:
the acquisition unit is used for respectively acquiring the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each switching tube in the more than two switching tubes;
a comparison unit, for comparing the magnitude relationship between the current frequency of each driving signal and the corresponding expected signal frequency;
a processing unit to: when a first type of driving signal exists, updating the current frequency of the first type of driving signal to a corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signal to a corresponding expected signal duty ratio; when a second type of driving signal exists, updating the current duty ratio of the second type of driving signal to the corresponding expected signal duty ratio, and then updating the current frequency of the driving signal to the corresponding expected signal frequency; the first type of driving signal is a driving signal with a current frequency greater than a corresponding expected signal frequency, and the second type of driving signal is a driving signal with a current frequency less than a corresponding expected signal frequency.
Based on the second aspect of the present application, in a first possible implementation manner, the driving signal updating apparatus further includes:
the acquiring unit is further configured to acquire switching characteristics of each of the two or more switching tubes, respectively;
a frequency threshold value determining unit for determining a frequency threshold value of the driving signal corresponding to each switching tube based on the switching characteristics of each switching tube;
the comparison unit is further configured to compare magnitude relationships between the expected signal frequencies of the driving signals and the corresponding frequency thresholds respectively;
the processing unit is further configured to: when the expected signal frequency of the driving signal is larger than the corresponding frequency threshold value, a first alarm signal is output.
Based on the second aspect of the present application, in a second possible implementation manner, the driving signal updating apparatus further includes:
the acquiring unit is further configured to acquire switching characteristics of each of the two or more switching tubes, respectively;
a duty threshold determination unit configured to determine a duty threshold of a driving signal corresponding to each of the switching tubes based on switching characteristics of each of the switching tubes;
the comparison unit is further configured to compare magnitude relationships between expected signal duty ratios of the driving signals and corresponding duty ratio thresholds respectively;
the processing unit is further configured to: and outputting a second alarm signal when the expected signal duty ratio of the driving signal is larger than the corresponding duty ratio threshold value.
Based on the second aspect of the present application or the first or second possible implementation manner of the second aspect of the present application, in a third possible implementation manner, the switch tube is an IGBT tube or an MOS tube.
The third aspect of the present application provides another driving signal updating apparatus applied to a switching tube control circuit, where the switching tube control circuit includes: the driving signal updating device includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the driving signal updating method mentioned in the first aspect or any possible implementation manner of the first aspect when executing the computer program.
A fourth aspect of the present application provides a computer-readable storage medium, which stores a computer program, where the computer program, when executed by a processor, implements the steps of the drive signal updating method mentioned in the first aspect or any possible implementation manner of the first aspect.
As can be seen from the above, in the technical scheme of the application, the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the more than two switching tubes are respectively obtained; respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency; if the first type of driving signals exist, updating the current frequency of the first type of driving signals to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signals to the corresponding expected signal duty ratio; if the second type of driving signal exists, the current duty ratio of the second type of driving signal is updated to be the corresponding expected signal duty ratio, and then the current frequency of the driving signal is updated to be the corresponding expected signal frequency, so that the situation that the dead time preset on the driving signal is shortened temporarily when the driving signal is updated is prevented, the control on the switching tube is improved, and the reliability of the control circuit of the switching tube is improved.
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 embodiments or the prior art descriptions will be briefly described 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 inventive exercise.
Fig. 1 is a schematic flowchart of an embodiment of a driving signal updating method applied to a switching tube control circuit according to the present application;
fig. 2 is a schematic structural diagram of an embodiment of a switching tube control circuit provided in the present application;
FIG. 3 is a waveform diagram illustrating an example of a first waveform and a second waveform provided herein;
FIG. 4 is a schematic structural diagram of an embodiment of a driving signal updating apparatus applied to a switching tube control circuit according to the present disclosure;
fig. 5 is a schematic structural diagram of another embodiment of a driving signal updating apparatus applied to a switching tube control circuit according to the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited by the specific embodiments disclosed below.
Example one
The application provides a drive signal updating method applied to a switching tube control circuit, wherein the switching tube control circuit comprises: as shown in fig. 1, the method for updating the driving signal includes:
in the embodiment of the present application, a current frequency of a driving signal for controlling on/off of each switching tube, an expected signal frequency for serving as an updated frequency of the driving signal, and an expected signal duty ratio for serving as an updated duty ratio of the driving signal in the switching tube control circuit are respectively obtained.
102, respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency;
in the embodiment of the present application, it is determined whether the current frequency of each of the driving signals is greater than the corresponding expected signal frequency, and whether the current frequency of each of the driving signals is less than the corresponding expected signal frequency.
In step 102, based on the comparison result, all the first-type driving signals and the second-type driving signals in the driving signals are determined, wherein the first-type driving signals are driving signals with current frequency greater than the frequency of the corresponding expected signals, and the second-type driving signals are driving signals with current frequency less than the frequency of the corresponding expected signals; triggering the execution of step 103 when the first type of drive signal is present; when the second type of drive signal is present, execution of step 104 is triggered.
in this embodiment, as shown in fig. 2, the switching tube control circuit may include: a half-bridge resonant circuit 201 and a synchronous rectification circuit 202;
the half-bridge resonant circuit 201 includes: a first switching tube 2011 and a second switching tube 2012;
the synchronous rectification circuit 202 includes: a third switching tube 2021 and a fourth switching tube 2022;
based on the circuit structure and functional requirements of the half-bridge resonant circuit 201 and the synchronous rectification circuit 202, the relationship existing between the switching tubes can be as follows: the first switch tube 2011 and the second switch tube 2012 can only be conducted one at a time, the third switch tube 2021 and the fourth switch tube 2022 can only be conducted one at a time, the third switch tube 2021 can be conducted after the first switch tube 2011 is conducted, and the fourth switch tube 2022 can be conducted after the second switch tube 2012 is conducted;
since the first switch tube 2011, the second switch tube 2012, the third switch tube 2021 and the fourth switch tube 2022 still need to be turned on or off completely after receiving the rising edge or the falling edge of the corresponding driving signal, based on the relationship among the switch tubes and the time required for the switch tubes to be turned on or off completely, a proper dead time needs to be set on the driving signal corresponding to the first switch tube 2011, the second switch tube 2012, the third switch tube 2021 and the fourth switch tube 2022 to prevent one of the switch tubes from being turned on or off completely before another switch tube which cannot be turned on simultaneously is turned on;
as can be seen from the above, for the switching tube control circuit, a proper dead time needs to be set on each driving signal, and it is ensured that the set dead time is not reduced in any case, so the present application provides the driving signal updating method, based on the step 101 and 104, all driving signals in the switching tube control circuit are updated simultaneously, that is, the dead time is prevented from being reduced in the updating process (when the dead time set on the driving signal is reduced to be smaller than the time required for the corresponding switching tube to be completely turned on or completely turned off, the dead time will be lost, so that the switching tube control circuit fails).
The following are also exemplified:
as shown in fig. 2 and 3, in this example, 301 is a waveform of one cycle of the driving signal corresponding to the first switching tube 2011, which is referred to as a first waveform; 302 is a waveform of one period of the driving signal corresponding to the second switching tube 2012, which is called as a second waveform; 303 is a dead time set for both the first waveform 301 and the second waveform 302 in the same period, that is, in the dead time, both the first waveform 301 and the second waveform 302 are at a low level;
if the driving signals corresponding to the first switch 2011 and the second switch 2012 are not updated by the method of steps 101-104 (hereinafter, the driving signal corresponding to the first switch 2011 is referred to as a first signal, and the driving signal corresponding to the second switch 2012 is referred to as a second signal), the following situations may occur:
generally, if it is necessary to keep the dead time set on the driving signal unchanged after the driving signal is updated, when the current frequency of the driving signal is updated from a high frequency to a low frequency, the current duty ratio of the driving signal is updated from a low duty ratio to a high duty ratio, that is, the desired signal duty ratio needs to be larger than the current duty ratio (when the frequency of the driving signal is reduced, the period is increased, and when the duty ratio is unchanged, the dead time set on the driving signal is also increased along with the increase of the period, so that when the frequency of the driving signal is reduced, the duty ratio needs to be increased to a certain extent, and the dead time may be kept unchanged);
if the dead time set on the driving signal needs to be kept unchanged after the driving signal is updated, the current duty ratio of the driving signal needs to be updated from a high duty ratio to a low duty ratio when the current frequency of the driving signal is updated from a low frequency to a high frequency, that is, the duty ratio of the desired signal needs to be smaller than the current duty ratio (the period is reduced when the frequency of the driving signal is increased, and if the duty ratio is not changed, the dead time set on the driving signal is also reduced along with the reduction of the period, so that the duty ratio needs to be reduced to a certain extent when the frequency of the driving signal is increased, and the dead time can be kept unchanged).
When updating the current frequencies of the first signal and the second signal from a high frequency to a low frequency, updating the current duty ratios of the first signal and the second signal to corresponding desired signal duty ratios, respectively, and then updating the current frequencies of the first signal and the second signal to corresponding desired signal frequencies, respectively, then:
since the current frequency of the driving signal is updated from a high frequency to a low frequency in the current update, on the premise that the duty ratio of the desired signal is larger than the current duty ratio, the dead time of the first signal and the second signal is reduced when the current duty ratio is updated and the current frequency is not updated.
When updating the current frequencies of the first signal and the second signal from a low frequency to a high frequency, updating the current frequencies of the first signal and the second signal to corresponding desired signal frequencies, respectively, and then updating the current duty ratios of the first signal and the second signal to corresponding desired signal duty ratios, respectively, then:
since the current frequency of the driving signal is updated from a low frequency to a high frequency in the current update, on the premise that the duty ratio of the desired signal is smaller than the current duty ratio, the dead time of the first signal and the second signal is reduced when the current frequency is updated but the current duty ratio is not updated.
Optionally, the method for updating the driving signal further includes:
after the above step 101 is executed, the execution of step 105 is triggered.
And 105, respectively acquiring the switching characteristics of each of the more than two switching tubes.
And 106, determining a frequency threshold of the driving signal corresponding to each switching tube based on the switching characteristics of each switching tube.
Step 107, comparing the magnitude relationship between the expected signal frequency of each driving signal and the corresponding frequency threshold value.
In step 107, it is determined whether there is a desired signal frequency of the driving signal greater than a corresponding frequency threshold based on the comparison result, and if so, execution of step 108 is triggered.
And step 108, outputting a first alarm signal.
Optionally, the method for updating the driving signal further includes:
after the above step 101 is executed, the execution of step 109 is triggered.
And step 109, respectively acquiring the switching characteristics of each of the more than two switching tubes.
And step 110, determining duty ratio threshold values of the driving signals corresponding to the switching tubes based on the switching characteristics of the switching tubes.
And step 111, comparing the magnitude relation between the expected signal duty ratio of each driving signal and the corresponding duty ratio threshold value.
In step 111, it is determined whether there is a desired signal duty ratio of the driving signal greater than a corresponding duty ratio threshold based on the comparison result, and if so, execution of step 112 is triggered.
And step 112, outputting a second alarm signal.
It should be noted that the different kinds of switching tubes have different switching characteristics, that is, the different kinds of switching tubes have different times to be completely turned on or completely turned off after receiving the corresponding rising edge or falling edge of the driving signal; if the expected signal frequency is too high, so that the length of one period after the corresponding driving signal is updated is smaller than the length of the set dead time, no matter how the duty ratio is adjusted, the result that the dead time is reduced cannot be avoided finally; if the duty cycle of the desired signal is too high and the corresponding drive signal has the lowest frequency (in practice, the drive signal is generally set to the lowest frequency), there is a possibility that the dead time of the drive signal will be reduced even if the frequency of the drive signal is reduced to the lowest frequency.
Optionally, the switching tube is an IGBT tube or an MOS tube.
Optionally, the driving signal is one of a square wave, a triangular wave or other waveforms.
Optionally, the driving signal is a PWM signal.
As can be seen from the above, in the technical scheme of the application, the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the more than two switching tubes are respectively obtained; respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency; if the first type of driving signals exist, updating the current frequency of the first type of driving signals to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signals to the corresponding expected signal duty ratio; if the second type of driving signal exists, the current duty ratio of the second type of driving signal is updated to be the corresponding expected signal duty ratio, and then the current frequency of the driving signal is updated to be the corresponding expected signal frequency, so that the situation that the dead time preset on the driving signal is shortened temporarily when the driving signal is updated is prevented, the control on the switching tube is improved, and the reliability of the control circuit of the switching tube is improved.
Example two
The present application further provides a driving signal updating apparatus applied to the switching tube control circuit, which corresponds to the above driving signal updating method in the first embodiment. Fig. 4 shows a driving signal updating apparatus applied to a switching tube control circuit according to the second embodiment of the present application. For convenience of explanation, only the portions related to the present embodiment are shown. Unless the present embodiment clearly indicates otherwise, the parts not specifically described in the present embodiment correspond to the driving signal updating method in the first embodiment.
As shown in fig. 4, the drive signal update apparatus 40 includes:
an obtaining unit 401, configured to obtain a current frequency, an expected signal frequency, and an expected signal duty ratio of a driving signal corresponding to each of the two or more switching tubes, respectively;
a comparing unit 402, configured to compare magnitude relationships between current frequencies of the driving signals and corresponding expected signal frequencies respectively;
a processing unit 403 for: when a first type of driving signal exists, updating the current frequency of the first type of driving signal to a corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signal to a corresponding expected signal duty ratio; when a second type of driving signal exists, updating the current duty ratio of the second type of driving signal to the corresponding expected signal duty ratio, and then updating the current frequency of the driving signal to the corresponding expected signal frequency; the first type of driving signal is a driving signal with a current frequency greater than a corresponding expected signal frequency, and the second type of driving signal is a driving signal with a current frequency less than a corresponding expected signal frequency.
Optionally, the driving signal updating apparatus 40 further includes:
a frequency threshold determining unit 404, configured to determine a frequency threshold of the driving signal corresponding to each of the switching tubes based on a switching characteristic of each of the switching tubes;
the obtaining unit 401 is further configured to obtain switching characteristics of each of the two or more switching tubes;
the comparing unit 402 is further configured to compare magnitude relationships between the expected signal frequencies of the driving signals and the corresponding frequency thresholds respectively;
the processing unit 403 is further configured to: when the expected signal frequency of the driving signal is larger than the corresponding frequency threshold value, a first alarm signal is output.
Optionally, the driving signal updating apparatus 40 further includes:
a duty threshold determination unit 405 configured to determine a duty threshold of a driving signal corresponding to each of the switching tubes based on switching characteristics of each of the switching tubes;
the obtaining unit 401 is further configured to obtain switching characteristics of each of the two or more switching tubes;
the comparing unit 402 is further configured to compare magnitude relationships between the duty ratios of the expected signals of the driving signals and the corresponding duty ratio thresholds respectively;
the processing unit 403 is further configured to: and outputting a second alarm signal when the expected signal duty ratio of the driving signal is larger than the corresponding duty ratio threshold value.
Optionally, the switching tube is an IGBT tube or an MOS tube.
Optionally, the driving signal is one of a square wave, a triangular wave or other waveforms.
Optionally, the driving signal is a PWM signal.
As can be seen from the above, in the technical scheme of the application, the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the more than two switching tubes are respectively obtained; respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency; if the first type of driving signals exist, updating the current frequency of the first type of driving signals to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signals to the corresponding expected signal duty ratio; if the second type of driving signal exists, the current duty ratio of the second type of driving signal is updated to be the corresponding expected signal duty ratio, and then the current frequency of the driving signal is updated to be the corresponding expected signal frequency, so that the situation that the dead time preset on the driving signal is shortened temporarily when the driving signal is updated is prevented, the control on the switching tube is improved, and the reliability of the control circuit of the switching tube is improved.
EXAMPLE III
The present application further provides a driving signal updating apparatus applied to a switching tube control circuit, where the switching tube control circuit includes: as shown in fig. 5, the driving signal updating apparatus in the embodiment of the present application includes: a memory 501, a processor 502, and a computer program stored in the memory 501 and executable on the processor 502, wherein: the memory 501 is used to store software programs and modules, the processor 502 executes various functional applications and data processing by running the software programs and modules stored in the memory 501, and the memory 501 and the processor 502 are connected by a bus 503.
Specifically, the processor 502 implements the following steps by running the above-mentioned computer program stored in the memory 501:
respectively acquiring the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each switching tube in the more than two switching tubes;
respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency;
if the first type of driving signal exists, updating the current frequency of the first type of driving signal to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signal to the corresponding expected signal duty ratio;
if a second type of driving signal exists, updating the current duty ratio of the second type of driving signal to the corresponding duty ratio of the expected signal, and then updating the current frequency of the driving signal to the corresponding frequency of the expected signal;
the first type of driving signal is a driving signal with a current frequency greater than a corresponding expected signal frequency, and the second type of driving signal is a driving signal with a current frequency less than a corresponding expected signal frequency.
Assuming that the above is the first possible implementation manner, in a second possible implementation manner based on the first possible implementation manner, after the obtaining of the current frequency, the desired signal frequency, and the desired signal duty ratio of the driving signal corresponding to each of the two or more switching tubes, respectively, the driving signal updating method further includes:
respectively acquiring the switching characteristics of each switching tube in the more than two switching tubes;
determining a frequency threshold of a driving signal corresponding to each switching tube based on the switching characteristics of each switching tube;
comparing the magnitude relation between the expected signal frequency of each driving signal and the corresponding frequency threshold value;
and if the expected signal frequency of the driving signal is greater than the corresponding frequency threshold, outputting a first alarm signal.
In a third possible implementation manner based on the first possible implementation manner, after the obtaining of the current frequency, the desired signal frequency, and the desired signal duty ratio of the driving signal corresponding to each of the two or more switching tubes, respectively, the driving signal updating method further includes:
respectively acquiring the switching characteristics of each switching tube in the more than two switching tubes;
determining duty ratio threshold values of driving signals corresponding to the switching tubes based on the switching characteristics of the switching tubes;
comparing the magnitude relation between the expected signal duty ratio of each driving signal and the corresponding duty ratio threshold value;
and if the expected signal duty ratio of the driving signal is larger than the corresponding duty ratio threshold value, outputting a second alarm signal.
As can be seen from the above, in the technical scheme of the application, the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the more than two switching tubes are respectively obtained; respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency; if the first type of driving signals exist, updating the current frequency of the first type of driving signals to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signals to the corresponding expected signal duty ratio; if the second type of driving signal exists, the current duty ratio of the second type of driving signal is updated to be the corresponding expected signal duty ratio, and then the current frequency of the driving signal is updated to be the corresponding expected signal frequency, so that the situation that the dead time preset on the driving signal is shortened temporarily when the driving signal is updated is prevented, the control on the switching tube is improved, and the reliability of the control circuit of the switching tube is improved.
Example four
The present application also provides a computer readable storage medium having stored thereon a computer program which, when executed, may implement the steps provided by the above-described embodiments. Specifically, the computer program includes computer program code, which may be in one of a source code form, an object code form, an executable file or some intermediate form, and is not limited herein; the computer readable storage medium can be any entity or device capable of carrying the computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-only memory (ROM), Random Access Memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, and is not limited herein. It should be noted that the contents contained in the computer-readable storage medium can be increased or decreased as required by legislation and patent practice in the jurisdiction.
As can be seen from the above, in the technical scheme of the application, the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the more than two switching tubes are respectively obtained; respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency; if the first type of driving signals exist, updating the current frequency of the first type of driving signals to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signals to the corresponding expected signal duty ratio; if the second type of driving signal exists, the current duty ratio of the second type of driving signal is updated to be the corresponding expected signal duty ratio, and then the current frequency of the driving signal is updated to be the corresponding expected signal frequency, so that the situation that the dead time preset on the driving signal is shortened temporarily when the driving signal is updated is prevented, the control on the switching tube is improved, and the reliability of the control circuit of the switching tube is improved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned functions may be distributed as different functional units and modules according to needs, that is, the internal structure of the apparatus may be divided into different functional units or modules to implement all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
It should be noted that, the methods and the details thereof provided by the foregoing embodiments may be combined with the apparatuses and devices provided by the embodiments, which are referred to each other and are not described again.
Those of ordinary skill in the art would appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described apparatus/device embodiments are merely illustrative, and for example, the division of the above-described modules or units is only one logical functional division, and the actual implementation may be implemented by another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A driving signal updating method applied to a switching tube control circuit, wherein the switching tube control circuit comprises the following steps: the method for updating the driving signal comprises the following steps that more than two switching tubes are arranged, and the on or off of each switching tube is controlled by the driving signal, and the method for updating the driving signal comprises the following steps:
respectively acquiring the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each switching tube in the more than two switching tubes;
respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency;
if the first type of driving signals exist, updating the current frequency of the first type of driving signals to the corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signals to the corresponding expected signal duty ratio;
if the second type of driving signal exists, updating the current duty ratio of the second type of driving signal to the corresponding duty ratio of the expected signal, and then updating the current frequency of the second type of driving signal to the corresponding frequency of the expected signal;
the first type of driving signal is a driving signal with the current frequency greater than the frequency of the corresponding expected signal, and the second type of driving signal is a driving signal with the current frequency less than the frequency of the corresponding expected signal.
2. The method for updating driving signal according to claim 1, wherein after the obtaining the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the two or more switching tubes, respectively, the method further comprises:
respectively acquiring the switching characteristics of each switching tube in the more than two switching tubes;
determining a frequency threshold of a driving signal corresponding to each switching tube based on the switching characteristics of each switching tube;
respectively comparing the magnitude relation between the expected signal frequency of each driving signal and the corresponding frequency threshold;
and if the expected signal frequency of the driving signal is greater than the corresponding frequency threshold, outputting a first alarm signal.
3. The method for updating driving signal according to claim 1, wherein after the obtaining the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each of the two or more switching tubes, respectively, the method further comprises:
respectively acquiring the switching characteristics of each switching tube in the more than two switching tubes;
determining a duty ratio threshold of a driving signal corresponding to each switching tube based on the switching characteristics of each switching tube;
respectively comparing the magnitude relation between the expected signal duty ratio of each driving signal and the corresponding duty ratio threshold value;
and if the expected signal duty ratio of the driving signal is larger than the corresponding duty ratio threshold value, outputting a second alarm signal.
4. The method for updating the driving signal according to any one of claims 1 to 3, wherein the switching tube is an IGBT tube or an MOS tube.
5. A driving signal updating device applied to a switching tube control circuit, wherein the switching tube control circuit comprises: the drive signal updating device comprises more than two switch tubes, and the on or off of each switch tube is controlled by a drive signal, and is characterized in that the drive signal updating device comprises:
the acquisition unit is used for respectively acquiring the current frequency, the expected signal frequency and the expected signal duty ratio of the driving signal corresponding to each switching tube in the more than two switching tubes;
the comparison unit is used for respectively comparing the magnitude relation between the current frequency of each driving signal and the corresponding expected signal frequency;
a processing unit to: when a first type of driving signal exists, updating the current frequency of the first type of driving signal to a corresponding expected signal frequency, and then updating the current duty ratio of the first type of driving signal to a corresponding expected signal duty ratio; when a second type of driving signal exists, updating the current duty ratio of the second type of driving signal to the corresponding expected signal duty ratio, and then updating the current frequency of the second type of driving signal to the corresponding expected signal frequency; the first type of driving signal is a driving signal with the current frequency greater than the frequency of the corresponding expected signal, and the second type of driving signal is a driving signal with the current frequency less than the frequency of the corresponding expected signal.
6. The drive signal updating apparatus according to claim 5, further comprising:
the acquisition unit is further used for respectively acquiring the switching characteristics of each of the more than two switching tubes;
a frequency threshold value determining unit, configured to determine a frequency threshold value of a driving signal corresponding to each switching tube based on a switching characteristic of each switching tube;
the comparison unit is further used for comparing the magnitude relation between the expected signal frequency of each driving signal and the corresponding frequency threshold value;
the processing unit is further to: when the expected signal frequency of the driving signal is larger than the corresponding frequency threshold value, a first alarm signal is output.
7. The drive signal updating apparatus according to claim 5, further comprising:
the acquisition unit is further used for respectively acquiring the switching characteristics of each of the more than two switching tubes;
a duty ratio threshold value determining unit, configured to determine a duty ratio threshold value of a driving signal corresponding to each switching tube based on switching characteristics of each switching tube;
the comparison unit is further used for comparing the magnitude relation between the expected signal duty ratio of each driving signal and the corresponding duty ratio threshold value;
the processing unit is further to: and outputting a second alarm signal when the expected signal duty ratio of the driving signal is larger than the corresponding duty ratio threshold value.
8. The driving signal updating device according to any one of claims 5 to 7, wherein the switching tube is an IGBT tube or an MOS tube.
9. A driving signal updating device applied to a switching tube control circuit, wherein the switching tube control circuit comprises: more than two switching tubes, and the on or off of each switching tube is controlled by the driving signal, characterized in that the driving signal updating device comprises a memory and a processor, the memory stores a computer program, and the processor implements the steps of the method according to any one of claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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| JP5375781B2 (en) * | 2010-09-13 | 2013-12-25 | オムロン株式会社 | Inverter |
| DE112012001746T5 (en) * | 2011-04-18 | 2014-01-23 | Mitsubishi Electric Corp. | Power conversion device and equipped with such a power supply device in a vehicle |
| CN102820767B (en) * | 2012-08-21 | 2015-04-15 | 深圳市英威腾电气股份有限公司 | Power unit board and method for driving switching tube of power unit board |
| CN110323927B (en) * | 2018-12-14 | 2024-06-14 | 特变电工西安电气科技有限公司 | Narrow pulse suppression method and device for three-level inverter |
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