CN107769756B - Control method and device for narrow pulse filtering, storage equipment and filtering equipment - Google Patents
Control method and device for narrow pulse filtering, storage equipment and filtering equipment Download PDFInfo
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Abstract
The invention discloses a control method and a control device for narrow pulse filtering, a storage device and a narrow pulse filtering device, wherein the method comprises the following steps: receiving a pulse signal for driving a switching tube of a switching circuit; detecting the level state of the received pulse signal; when the level of the received pulse signal is detected to be high level or low level, outputting the corresponding high level or low level to the switching tube; when the level of the received pulse signal is detected to enter a rising edge state, the level detection state is suspended and timing is started, and when a timing value is within a first pulse width limit threshold value, a low level is output to the switching tube; when the level of the received pulse signal is detected to enter a state of falling edge, the level detection state is suspended and timing is started, and when the timing value is within a second pulse width limit threshold value, a high level is output to the switching tube. By adopting the embodiment of the invention, the dissipation power of the switching tube is reduced, the overall working efficiency of the circuit is improved, and the output pulse width is adjusted.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a control method and device for narrow pulse filtering, storage equipment and narrow pulse filtering equipment.
Background
For an ideal PWM (Pulse Width Modulation) signal, a duty ratio D of Ton/T, i.e. the proportion of the on-time to the entire PWM waveform period, is provided as shown in fig. 1. The actual PWM signal waveform is shown in fig. 1, and there are rising and falling edges during the on period.
In the switching tube of the switching tube driving circuit, the switching tube is a semiconductor device, and usually includes a triode, a field effect transistor, an IGBT tube, a GTO, a GTR, and the like, and the dissipated power of the switching tube is P ═ U × I, U is a voltage across the switching tube, and I is a current flowing through the switching tube. When the switch tube is cut off, I is about zero, so P is approximately zero; when the switching tube is in saturated conduction, the voltage U at the two ends of the switching tube is very small, so that P is very small at the moment; when the switch tube is in a linear state, the voltage U across the switch tube is larger, and generally I is also larger at this time, so P is larger at this time.
A typical switching tube driving circuit is shown in fig. 2, where the PWM signal controls the switching tube to turn on and off, and the inductive device is a driving load of the switching tube, and includes, but is not limited to, an inductor and a transformer. Because the PWM signal for controlling the switch tube has narrow pulse, the duty ratio of the narrow pulse is relatively small, and the switch tube is in a linear state when the PWM signal is in a rising edge and a falling edge, the proportion of the time of the switch tube in a linear area to the total on-time of the switch tube is higher, and because the dissipation power P of the switch tube in the linear state is higher, the temperature of the switch tube is higher, the total dissipation power of the switch tube is further increased when the number of the narrow pulse is more, the working efficiency of the whole circuit is reduced, and if the temperature of the switch tube exceeds a rated value, the switch tube may be damaged.
Disclosure of Invention
The control method and device for narrow pulse filtering, the storage device and the narrow pulse filtering device provided by the embodiment of the invention can reduce the dissipation power of the switching tube, improve the overall working efficiency of the circuit and adjust the effective pulse width of the output.
In a first aspect, an embodiment of the present invention provides a control method for narrow pulse filtering, including:
receiving a pulse signal for driving a switching tube of a switching circuit;
detecting the level state of the received pulse signal;
when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube;
when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube;
when the level of the received pulse signal is detected to enter a rising edge state, the level detection state is suspended and timing is started, and when a timing value is within a first pulse width limit threshold value, a low level is output to the switching tube;
when the level of the received pulse signal is detected to enter a state of a falling edge, the level detection state is suspended and timing is started, and when a timing value is within a second pulse width limit threshold value, a high level is output to the switching tube;
wherein the first pulse width limiting threshold is greater than a pulse width of a narrow pulse in a high state, the first pulse width limiting threshold being the same as the second pulse width limiting threshold.
As a further improvement of the embodiment of the present invention, when it is detected that the received pulse signal enters a state of a rising edge, the detecting of the level state is suspended and the timing is started, and when the timing value is within the first pulse width limit threshold, a low level is output to the switching tube, specifically:
when the level of the received pulse signal jumps upwards relative to the level of the pulse signal received at the previous moment and the level of the pulse signal received at the previous moment is low, triggering a timer to start timing and suspending the detection of the level state of the received pulse signal;
if the timing value does not reach the first pulse width limiting threshold value, outputting a low level to the switching tube;
and if the timing value reaches the first pulse width limit threshold value, suspending the timing of the timer and detecting the level state of the received pulse signal again.
As a further improvement of the embodiment of the present invention, when it is detected that the level of the received pulse signal enters a state of a falling edge, the detecting of the level state is suspended and timing is started, and when the timing value is within a second pulse width limit threshold, a high level is output to the switching tube, specifically:
when the level of the received pulse signal jumps downwards relative to the level of the pulse signal received at the previous moment and the level of the pulse signal at the previous moment is high, triggering a timer to start timing and suspending the detection of the level state of the received pulse signal;
if the timing value does not reach the second pulse width limiting threshold value, outputting a high level to the switching tube;
and if the timing value reaches the second pulse width limit threshold value, suspending the timing of the timer and resetting the timing value, and detecting the level state of the received pulse signal again.
Preferably, the first pulse width limiting threshold is the same as the second pulse width limiting threshold.
In a second aspect, an embodiment of the present invention provides a control method for narrow pulse filtering, including:
receiving a pulse signal for driving a switching tube of a switching circuit;
detecting the level state of the received pulse signal;
when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube;
when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube;
when the level of the received pulse signal is detected to enter a rising edge state, starting a first timer to start timing, and when the timing value of the first timer is within a first pulse width limit threshold value and the level of the received pulse signal is not detected to enter a falling edge state, shielding the detected level of the pulse signal and outputting a low level to the switching tube; when the timing value of the first timer is within the first pulse width limit threshold value and the level of the received pulse signal is detected to enter a falling edge state, starting a second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a high level to the switching tube;
when the level of the received pulse signal is detected to enter a state of falling edge, starting the second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is not detected to enter a state of rising edge, shielding the level of the detected pulse signal and outputting a high level to the switching tube; when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is detected to enter a state of rising edge, starting the first timer to start timing, and when the timing value of the first timer is within the first pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a low level to the switching tube.
In a third aspect, an embodiment of the present invention further provides a control device for narrow pulse filtering, including:
the signal receiving module is used for receiving a pulse signal for driving a switching tube of the switching circuit;
the level detection module is used for detecting the level state of the received pulse signal;
the first level output module is used for outputting a high level to the switching tube when detecting that the level of the received pulse signal is the high level;
the second level output module is used for outputting a low level to the switching tube when the level of the received pulse signal is detected to be the low level;
the third level output module is used for suspending the detection of the level state and starting timing when detecting that the level of the received pulse signal enters the state of rising edge, and outputting low level to the switching tube when the timing value is within the first pulse width limit threshold value;
and the fourth level output module is used for suspending the detection of the level state and starting timing when the level of the received pulse signal is detected to enter the state of a falling edge, and outputting a high level to the switching tube when the timing value is within the second pulse width limit threshold value.
In a fourth aspect, embodiments of the present invention further provide a storage device, where a plurality of instructions are stored, and when executed by a processor, the storage device implements any embodiment of the control method for narrow pulse filtering provided in the first aspect.
In a fifth aspect, an embodiment of the present invention further provides a narrow pulse filtering apparatus, including a storage device, a processor, and a plurality of instructions stored on the storage device and executable on the processor, where the processor executes the instructions to implement any embodiment of the control method for narrow pulse filtering provided in the first aspect.
In a sixth aspect, an embodiment of the present invention further provides a control device for narrow pulse filtering, including:
the signal receiving module is used for receiving a pulse signal for driving a switching tube of the switching circuit;
the level detection module is used for detecting the level state of the received pulse signal;
the first level output module is used for outputting a high level to the switching tube when detecting that the level of the received pulse signal is the high level;
the second level output module is used for outputting a low level to the switching tube when the level of the received pulse signal is detected to be the low level;
the third level output module is used for starting a first timer to start timing when the level of the received pulse signal is detected to enter a rising edge state, shielding the detected level of the pulse signal and outputting a low level to the switching tube when the timing value of the first timer is within a first pulse width limit threshold value and the level of the received pulse signal is not detected to enter a falling edge state; when the timing value of the first timer is within the first pulse width limit threshold value and the level of the received pulse signal is detected to enter a falling edge state, starting a second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a high level to the switching tube;
the fourth level output module is used for starting the second timer to start timing when the level of the received pulse signal is detected to enter a falling edge state, shielding the detected level of the pulse signal and outputting a high level to the switching tube when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is not detected to enter a rising edge state; when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is detected to enter a state of rising edge, starting the first timer to start timing, and when the timing value of the first timer is within the first pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a low level to the switching tube.
In a seventh aspect, an embodiment of the present invention further provides a storage device, where multiple instructions are stored, and when executed by a processor, the control method for narrow pulse filtering provided in the second aspect is implemented.
In an eighth aspect, an embodiment of the present invention further provides a narrow pulse filtering device, which includes a storage device, a processor, and a plurality of instructions stored on the storage device and executable on the processor, where the processor executes the instructions to implement the control method for narrow pulse filtering provided in the second aspect.
The embodiment of the invention has the following beneficial effects:
the control method and the device for narrow pulse filtering, the storage equipment and the narrow pulse filtering equipment provided by the embodiment of the invention carry out real-time level detection on the received pulse signal for driving the switching tube of the switching circuit; when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube; when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube; when the level of the received pulse signal is detected to be in a rising edge state, the level detection state is suspended and timing is started, and when the timing value is within a first pulse width limit threshold value, a low level is output to the switching tube, so that narrow pulses which are at a high level and have pulse widths smaller than the first pulse width limit threshold value can be filtered; when the level of the received pulse signal is detected to be in a state of falling edge, the detection level state is suspended to start timing, when the timing value is in a second pulse width limit threshold value, a high level is output to the switching tube, narrow pulses which are in a low level and have pulse widths smaller than the second pulse width limit threshold value can be filtered, and after timing is finished, corresponding high and low levels are output according to the detected high and low levels, so that normal pulses in the pulse signal are normally output. Therefore, narrow pulses are filtered, the output pulse signals reduce the dissipation power caused by the narrow pulses to the switching tube, and the overall working efficiency of the switching tube circuit is improved.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a PWM signal provided by the present invention;
FIG. 2 is a schematic diagram of another embodiment of a PWM signal provided by the present invention;
FIG. 3 is a schematic flow chart diagram illustrating an embodiment of a method for controlling narrow pulse filtering provided by the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a narrow pulse filtering control device provided by the present invention;
FIG. 5 is a schematic structural diagram of a third level output module of the control apparatus for narrow pulse filtering according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a fourth level output module of the control apparatus for narrow pulse filtering according to an embodiment of the present invention;
FIG. 7 is a schematic flow chart diagram illustrating another embodiment of a method for controlling narrow pulse filtering provided by the present invention;
FIG. 8 is a schematic diagram illustrating an embodiment of a timing of an input pulse signal and a timing of an output pulse signal processed by the control method for narrow pulse filtering provided in the present invention;
FIG. 9 is a schematic diagram comparing the input pulse signal timing and the output pulse signal timing processed by the control method for narrow pulse filtering provided by the present invention;
fig. 10 is a schematic structural diagram of an embodiment of a control device for narrow pulse filtering provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Example one
Fig. 3 is a schematic flow chart of an embodiment of a control method for narrow-pulse filtering provided by the present invention; the control method of the narrow pulse filtering, executed by the control processor, includes steps S1 to S6, as follows:
and S1, receiving a pulse signal for driving a switching tube of the switching circuit. The pulse signal is generated by the signal generator, and the pulse signal received in step S1 is a signal received at a moment of the current time, and the control processor continues to receive the pulse signal at each moment, so that the received pulse signal varies with time as shown in fig. 1 and 2, and the input pulse timing signal may include a narrow pulse at a high level and a narrow pulse at a low level. The pulse time sequence signal is used for driving the switch tube, when the pulse signal is in a state of rising edge and falling edge, the switch tube is in a linear area, and when the quantity proportion of narrow pulses is higher, the proportion of the time of the switch tube in the linear area to the total on-time of the switch tube is higher, so that the dissipation power of the switch tube is increased, the working efficiency of a circuit is reduced, and even the switch tube is damaged.
S2, the level state of the received pulse signal is detected. It should be noted that, in step S2, the pulse signal received at each time is detected.
S3, when the level of the received pulse signal is detected to be high level, outputting high level to the switch tube;
s4, when the level of the received pulse signal is detected to be low level, outputting the low level to the switch tube;
s5, when detecting that the level of the received pulse signal enters the state of rising edge, suspending the detection of the level state and starting timing, and when the timing value is within the first pulse width limit threshold value, outputting low level to the switch tube;
and S6, when the level of the received pulse signal is detected to enter a state of falling edge, suspending the detection of the level state and starting timing, and when the timing value is within the second pulse width limit threshold value, outputting a high level to the switch tube.
It should be noted that, steps S3 to S4 are executed only after step S2 by selecting one of them. Steps S3 and S4 can ensure that the normal pulse signal keeps outputting, steps S5 and S6 can enable the narrow pulses in the pulse signal timing to be filtered out, and the magnitudes of the first and second pulse width limiting thresholds can be adjusted to adjust the duty ratio of the output pulse timing signal.
As a further improvement of the embodiment of the present invention, the specific implementation process of step S5 is as follows:
when the level of the received pulse signal jumps upwards relative to the level of the pulse signal received at the previous moment and the level of the pulse signal received at the previous moment is low, triggering a timer to start timing and suspending the detection of the level state of the received pulse signal;
if the timing value does not reach the first pulse width limiting threshold value, outputting a low level to the switching tube;
and if the timing value reaches the first pulse width limit threshold value, suspending the timing of the timer and resetting the timing value, and detecting the level state of the received pulse signal again. After the time count is completed, the above step S2 is continued, and then step S3 or S4 should be performed next.
In the embodiment of resetting the count time value, the timer may be reset before the timer is triggered to start counting. It is only necessary to ensure that the reset is performed before the trigger timer starts to count, and the present invention is not limited to the above embodiment. And, the first pulse width limiting threshold should be larger than the pulse width of the narrow pulse in the high state.
In addition, since the timer is started to time after the moment that the pulse signal jumps upwards is captured, when the timing value does not reach the pulse width limit threshold value, no matter how the level of the received pulse signal is, the low level is continuously output to the switching tube, and therefore the signal of the narrow pulse can be filtered.
As a further improvement of the embodiment of the present invention, the specific implementation process of step S6 is as follows:
when the level of the received pulse signal jumps downwards relative to the level of the pulse signal received at the previous moment and the level of the pulse signal at the previous moment is high, triggering a timer to start timing and suspending the detection of the level state of the received pulse signal;
if the timing value does not reach the second pulse width limiting threshold value, outputting a high level to the switching tube;
and if the timing value reaches the second pulse width limit threshold value, suspending the timing of the timer and resetting the timing value, and detecting the level state of the received pulse signal again. After the time count is completed, the above step S2 is continued, and then step S3 or S4 should be performed next.
In the embodiment where the timer value is reset, the timer may be reset before the timer is triggered to start counting. It is only necessary to ensure that the reset is performed before the trigger timer starts to count, and the present invention is not limited to the above embodiment.
In addition, since the timer is started to time after the moment that the pulse signal jumps downwards is captured, when the timing value does not reach the pulse width limit threshold value, no matter how the level of the received pulse signal is, a high level is continuously output to the switching tube, and therefore the signal of the narrow pulse can be filtered.
Preferably, the first pulse width limiting threshold is the same as the second pulse width limiting threshold. In this way, the pulse width of the output pulse timing signal can be made to coincide with the pulse width of the input pulse timing signal, and the pulse width of the output pulse timing signal can be adjusted by making the first pulse width limiting threshold different from the second pulse width limiting threshold.
The control method for narrow pulse filtering provided by the embodiment of the invention carries out real-time level detection on the received pulse signal for driving the switching tube of the switching circuit; when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube; when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube; when the level of the received pulse signal is detected to be in a rising edge state, the level detection state is suspended and timing is started, and when the timing value is within a first pulse width limit threshold value, a low level is output to the switching tube, so that narrow pulses which are at a high level and have pulse widths smaller than the first pulse width limit threshold value can be filtered; when the level of the received pulse signal is detected to be in a state of falling edge, the detection level state is suspended to start timing, when the timing value is in a second pulse width limit threshold value, a high level is output to the switching tube, narrow pulses which are in a low level and have pulse widths smaller than the second pulse width limit threshold value can be filtered, and after timing is finished, corresponding high and low levels are output according to the detected high and low levels, so that normal pulses in the pulse signal are normally output. Therefore, narrow pulses are filtered, the output pulse signals reduce the dissipation power caused by the narrow pulses to the switching tube, and the overall working efficiency of the switching tube circuit is improved.
Example two
Fig. 4 is a schematic structural diagram of an embodiment of the control device for narrow pulse filtering provided by the present invention; the embodiment of the present invention provides a control device for narrow pulse filtering, which can implement all the processes of the control method for narrow pulse filtering provided in the above embodiment, and specifically includes:
the signal receiving module 10 is used for receiving a pulse signal for driving a switching tube of the switching circuit;
a level detection module 20, configured to detect a level state of the received pulse signal;
a first level output module 30, configured to output a high level to the switching tube when detecting that the level of the received pulse signal is the high level;
the second level output module 40 is configured to output a low level to the switching tube when detecting that the level of the received pulse signal is a low level;
a third level output module 50, configured to suspend the detection of the level state and start timing when detecting that the level of the received pulse signal enters a state of a rising edge, and output a low level to the switching tube when the timing value is within the first pulse width limit threshold;
and a fourth level output module 60, configured to, when it is detected that the level of the received pulse signal enters a state of a falling edge, suspend detecting the level state and start timing, and when the timing value is within the second pulse width limit threshold, output a high level to the switch tube.
As a further improvement of the embodiment of the present invention, as shown in fig. 5, fig. 5 is a schematic structural diagram of an embodiment of a third level output module of the control apparatus for narrow pulse filtering provided by the present invention; the third level output module 50 specifically includes:
a first trigger timing unit 51, configured to trigger a timer to start timing and suspend detecting a level state of a received pulse signal when a received pulse signal jumps upwards relative to a level of a pulse signal received at a previous time and the level of the pulse signal received at the previous time is a low level;
the first timing operation unit 52 is used for outputting a low level to the switch tube if the timing value does not reach the first pulse width limit threshold value;
and a second timing operation unit 53, configured to suspend timing of the timer and reset the timing value if the timing value reaches the first pulse width limitation threshold, and detect the level state of the received pulse signal again.
As a further improvement of the embodiment of the present invention, as shown in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a fourth level output module of the control apparatus for narrow pulse filtering provided by the present invention; the fourth level output module 60 specifically includes:
the second trigger timing unit 61 is configured to trigger the timer to start timing and suspend detecting the level state of the received pulse signal when the received pulse signal makes a downward jump relative to the level of the pulse signal received at the previous time and the level of the pulse signal at the previous time is a high level;
a third timing operation unit 62, configured to output a high level to the switch tube if the timing value does not reach the second pulse width limit threshold;
and a fourth timing operation unit 63, configured to suspend the timer and reset the timing value if the timing value reaches the second pulse width limitation threshold, and detect the level state of the received pulse signal again.
Preferably, the first pulse width limiting threshold is the same as the second pulse width limiting threshold.
The embodiment of the invention has the following beneficial effects:
the narrow pulse filtering control device provided by the embodiment of the invention carries out real-time level detection on the received pulse signal for driving the switching tube of the switching circuit; when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube; when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube; when the level of the received pulse signal is detected to be in a rising edge state, the level detection state is suspended and timing is started, and when the timing value is within a first pulse width limit threshold value, a low level is output to the switching tube, so that narrow pulses which are at a high level and have pulse widths smaller than the first pulse width limit threshold value can be filtered; when the level of the received pulse signal is detected to be in a state of falling edge, the detection level state is suspended to start timing, when the timing value is in a second pulse width limit threshold value, a high level is output to the switching tube, narrow pulses which are in a low level and have pulse widths smaller than the second pulse width limit threshold value can be filtered, and after timing is finished, corresponding high and low levels are output according to the detected high and low levels, so that normal pulses in the pulse signal are normally output. Therefore, narrow pulses are filtered, the output pulse signals reduce the dissipation power caused by the narrow pulses to the switching tube, and the overall working efficiency of the switching tube circuit is improved.
In addition, an embodiment of the present invention further provides a storage device, where multiple instructions are stored, and when the instructions are executed by a processor, any technical solution of the control method for narrow pulse filtering provided in the first embodiment is implemented.
Further, an embodiment of the present invention further provides a narrow pulse filtering device, including a storage device, a processor, and a plurality of instructions stored on the storage device and executable on the processor, where when the processor executes the instructions, any technical solution of the control method for narrow pulse filtering provided in the first embodiment is implemented.
EXAMPLE III
Fig. 7 is a schematic flow chart of another embodiment of the control method for narrow-pulse filtering provided by the present invention; the control method of the narrow pulse filtering, executed by the control processor, includes steps S11 to S17, as follows:
s11, receiving a pulse signal for driving a switching tube of the switching circuit;
s12, detecting the level state of the received pulse signal;
s13, when the level of the received pulse signal is detected to be high level, outputting high level to the switch tube;
s14, when the level of the received pulse signal is detected to be low level, outputting the low level to the switch tube;
s15, when the level of the received pulse signal is detected to enter the state of rising edge, starting a first timer to start timing, and when the timing value of the first timer is within a first pulse width limit threshold value and the level of the received pulse signal is not detected to enter the state of falling edge, shielding the level of the detected pulse signal and outputting low level to the switching tube; when the timing value of the first timer is within the first pulse width limit threshold value and the level of the received pulse signal is detected to enter a falling edge state, starting a second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a high level to the switching tube;
s16, when the level of the received pulse signal is detected to enter a state of falling edge, starting the second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold and the level of the received pulse signal is not detected to enter a state of rising edge, shielding the detected level of the pulse signal and outputting a high level to the switching tube; when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is detected to enter a state of rising edge, the first timer is started to time, and when the timing value of the first timer is within the first pulse width limit threshold value, the level of the detected pulse signal is shielded, and a low level is output to the switching tube.
It should be noted that, steps S13 to S16 are executed only after step S12 by selecting one of them. Steps S13 and S14 can ensure that the normal pulse signal keeps outputting, steps S15 and S16 can enable the narrow pulses in the pulse signal timing to be filtered out, and the magnitudes of the first and second pulse width limiting thresholds can be adjusted to adjust the duty ratio of the output pulse timing signal. And resetting the timer before the timer is started again.
In addition, referring to fig. 8, fig. 8 is a schematic diagram comparing an input pulse signal timing and an output pulse signal timing processed by the control method for narrow pulse filtering according to the present invention, where the input pulse signal timing of fig. 8 is a pulse signal timing effective for a low level of a switching tube and a special narrow pulse exists, according to the method provided in step S5 provided in the first embodiment, when a level of the pulse signal is detected to enter a rising edge, a timer starts to time, when a timing value is within a first pulse threshold, a falling edge comes earlier or a low level is output, so if a following pulse signal is also a similar signal, a low level is continuously output, so that the switching tube is always turned on, and the probability of the switching tube being damaged is very high, thus implementing the S15 scheme provided in three aspects, the pulse width of the special narrow pulse shown in fig. 8 can be expanded, specifically, as shown in the output pulse signal timing sequence of fig. 8, the special narrow pulse filtering effect is realized, and the switch tube is prevented from being damaged.
And, referring to fig. 9, fig. 9 is a schematic diagram comparing the input pulse signal timing and the output pulse signal timing processed by the control method for narrow pulse filtering according to another embodiment of the present invention, where the input pulse signal timing of fig. 9 is a pulse signal timing effective for the high level of the switch tube and there exists a special narrow pulse, according to the method provided in step S6 provided in the second embodiment, when the level of the pulse signal is detected to enter into the falling edge, the timer starts to time, when the timing value is within the second pulse threshold, the rising edge is advanced or the high level is output, so if the following pulse signal is also similar to such a signal, the high level is continuously output, so that the switch tube is always on, the probability of the switch tube being damaged is very high, thus implementing the S16 scheme provided in the third embodiment, the pulse width of the special narrow pulse shown in fig. 9 can be expanded, specifically, as shown in the output pulse signal timing sequence of fig. 9, the special narrow pulse filtering effect is realized, and the switch tube is prevented from being damaged.
According to the control method for narrow pulse filtering provided by the embodiment of the invention, on the premise of realizing common pulse filtering, the pulse width of the detected special narrow pulse is expanded by combining the timing of the first timer and the timing of the second timer, so that the narrow pulse is not narrow, the effect of filtering the special narrow pulse is realized, and the switch tube is prevented from being damaged.
Example four
Fig. 10 is a schematic structural diagram of an embodiment of the control device for narrow pulse filtering provided by the present invention; the invention provides a control device for narrow pulse filtering, which can realize all the processes of the method provided by the third embodiment, and specifically comprises the following steps:
the signal receiving module 100 is used for driving a pulse signal of a switching tube of the switching circuit;
a level detection module 200, configured to detect a level state of the received pulse signal;
a first level output module 300, configured to output a high level to the switching tube when detecting that the level of the received pulse signal is a high level;
a second level output module 400, configured to output a low level to the switching tube when it is detected that the level of the received pulse signal is a low level;
a third level output module 500, configured to start a first timer to start timing when it is detected that the level of the received pulse signal enters a state of a rising edge, shield the level of the detected pulse signal when a timing value of the first timer is within a first pulse width limiting threshold and it is not detected that the level of the received pulse signal enters a state of a falling edge, and output a low level to the switching tube; when the timing value of the first timer is within the first pulse width limit threshold value and the level of the received pulse signal is detected to enter a falling edge state, starting a second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a high level to the switching tube;
a fourth level output module 600, configured to start the second timer to start timing when it is detected that the level of the received pulse signal enters a state of a falling edge, and shield the level of the detected pulse signal and output a high level to the switching tube when a timing value of the second timer is within the second pulse width limiting threshold and the level of the received pulse signal is not detected to enter a state of a rising edge; when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is detected to enter a state of rising edge, starting the first timer to start timing, and when the timing value of the first timer is within the first pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a low level to the switching tube.
In addition, an embodiment of the present invention further provides a storage device, where multiple instructions are stored, and when the instructions are executed by a processor, any technical solution of the control method for narrow pulse filtering provided in the third embodiment is implemented.
Further, an embodiment of the present invention further provides a narrow pulse filtering device, including a storage device, a processor, and a plurality of instructions that are stored on the storage device and can be executed on the processor, where when the processor executes the instructions, any technical solution of the control method for narrow pulse filtering provided in the third embodiment is implemented.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method of controlling narrow pulse filtering, comprising:
receiving a pulse signal for driving a switching tube of a switching circuit;
detecting the level state of the received pulse signal;
when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube;
when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube;
when the level of the received pulse signal is detected to enter a rising edge state, the level detection state is suspended and timing is started, and when a timing value is within a first pulse width limit threshold value, a low level is output to the switching tube;
when the level of the received pulse signal is detected to enter a state of a falling edge, the level detection state is suspended and timing is started, and when a timing value is within a second pulse width limit threshold value, a high level is output to the switching tube;
wherein the first pulse width limiting threshold is greater than a pulse width of a narrow pulse in a high state, the first pulse width limiting threshold being the same as the second pulse width limiting threshold.
2. The control method of narrow pulse filtering according to claim 1, characterized by: when detecting that the received pulse signal enters a rising edge state, suspending detection of a level state and starting timing, and when a timing value is within a first pulse width limit threshold value, outputting a low level to the switching tube, specifically:
when the level of the received pulse signal jumps upwards relative to the level of the pulse signal received at the previous moment and the level of the pulse signal received at the previous moment is low, triggering a timer to start timing and suspending the detection of the level state of the received pulse signal;
if the timing value does not reach the first pulse width limiting threshold value, outputting a low level to the switching tube;
and if the timing value reaches the first pulse width limit threshold value, suspending the timing of the timer and detecting the level state of the received pulse signal again.
3. The control method of narrow pulse filtering according to claim 2, characterized by: when the level of the received pulse signal is detected to enter a falling edge state, the level detection state is suspended and timing is started, and when a timing value is within a second pulse width limit threshold value, a high level is output to the switching tube, specifically:
when the level of the received pulse signal jumps downwards relative to the level of the pulse signal received at the previous moment and the level of the pulse signal at the previous moment is high, triggering a timer to start timing and suspending the detection of the level state of the received pulse signal;
if the timing value does not reach the second pulse width limiting threshold value, outputting a high level to the switching tube;
and if the timing value reaches the second pulse width limit threshold value, suspending the timing of the timer and detecting the level state of the received pulse signal again.
4. A method of controlling narrow pulse filtering, comprising:
receiving a pulse signal for driving a switching tube of a switching circuit;
detecting the level state of the received pulse signal;
when the level of the received pulse signal is detected to be high level, outputting the high level to the switching tube;
when the level of the received pulse signal is detected to be low level, outputting the low level to the switching tube;
when the level of the received pulse signal is detected to enter a rising edge state, starting a first timer to start timing, and when the timing value of the first timer is within a first pulse width limit threshold value and the level of the received pulse signal is not detected to enter a falling edge state, shielding the detected level of the pulse signal and outputting a low level to the switching tube; when the timing value of the first timer is within the first pulse width limit threshold value and the level of the received pulse signal is detected to enter a falling edge state, starting a second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a high level to the switching tube;
when the level of the received pulse signal is detected to enter a state of falling edge, starting the second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is not detected to enter a state of rising edge, shielding the level of the detected pulse signal and outputting a high level to the switching tube; when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is detected to enter a state of rising edge, starting the first timer to start timing, and when the timing value of the first timer is within the first pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a low level to the switching tube.
5. A control device for narrow pulse filtering, comprising:
the signal receiving module is used for receiving a pulse signal for driving a switching tube of the switching circuit;
the level detection module is used for detecting the level state of the received pulse signal;
the first level output module is used for outputting a high level to the switching tube when detecting that the level of the received pulse signal is the high level;
the second level output module is used for outputting a low level to the switching tube when the level of the received pulse signal is detected to be the low level;
the third level output module is used for suspending the detection of the level state and starting timing when detecting that the level of the received pulse signal enters the state of rising edge, and outputting low level to the switching tube when the timing value is within the first pulse width limit threshold value;
and the fourth level output module is used for suspending the detection of the level state and starting timing when the level of the received pulse signal is detected to enter the state of a falling edge, and outputting a high level to the switching tube when the timing value is within the second pulse width limit threshold value.
6. A storage device having stored therein a plurality of instructions, wherein said instructions when executed by a processor implement the method of controlling narrow pulse filtering according to any one of claims 1 to 3.
7. A narrow pulse filtering device, comprising a storage device, a processor, and a plurality of instructions stored on the storage device and executable on the processor, wherein the processor executes the instructions to implement the control method of narrow pulse filtering according to any one of claims 1 to 3.
8. A control device for narrow pulse filtering, comprising:
the signal receiving module is used for receiving a pulse signal for driving a switching tube of the switching circuit;
the level detection module is used for detecting the level state of the received pulse signal;
the first level output module is used for outputting a high level to the switching tube when detecting that the level of the received pulse signal is the high level;
the second level output module is used for outputting a low level to the switching tube when the level of the received pulse signal is detected to be the low level;
the third level output module is used for starting a first timer to start timing when the level of the received pulse signal is detected to enter a rising edge state, shielding the detected level of the pulse signal and outputting a low level to the switching tube when the timing value of the first timer is within a first pulse width limit threshold value and the level of the received pulse signal is not detected to enter a falling edge state; when the timing value of the first timer is within the first pulse width limit threshold value and the level of the received pulse signal is detected to enter a falling edge state, starting a second timer to start timing, and when the timing value of the second timer is within the second pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a high level to the switching tube;
the fourth level output module is used for starting the second timer to start timing when the level of the received pulse signal is detected to enter a falling edge state, shielding the detected level of the pulse signal and outputting a high level to the switching tube when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is not detected to enter a rising edge state; when the timing value of the second timer is within the second pulse width limit threshold value and the level of the received pulse signal is detected to enter a state of rising edge, starting the first timer to start timing, and when the timing value of the first timer is within the first pulse width limit threshold value, shielding the level of the detected pulse signal and outputting a low level to the switching tube.
9. A storage device having stored therein a plurality of instructions, wherein said instructions when executed by a processor implement the method of controlling narrow pulse filtering of claim 4.
10. A narrow pulse filtering device comprising a storage device, a processor, and a plurality of instructions stored on the storage device and executable on the processor, wherein the processor implements the control method of narrow pulse filtering according to claim 4 when executing the instructions.
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| CN111766452A (en) * | 2020-07-28 | 2020-10-13 | 哈尔滨工业大学 | Transient high-frequency pulse waveform capturing system and method |
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