CN115774144A - Zero-crossing detection signal adjusting method, zero-crossing detection signal adjusting device, terminal equipment and medium - Google Patents
Zero-crossing detection signal adjusting method, zero-crossing detection signal adjusting device, terminal equipment and medium Download PDFInfo
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Abstract
The invention discloses a zero-crossing detection signal adjusting method, a zero-crossing detection signal adjusting device, terminal equipment and a medium. The method comprises the following steps: acquiring a zero-crossing detection signal detected and output by a zero-crossing detection circuit; when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse; the pulse width of the active pulse is saved for use in adjusting the position of the next active pulse. By using the method, the position of the next effective pulse can be effectively adjusted based on the pulse width of the effective pulse, the technical problem that the zero point represented by the zero-crossing detection signal detected by the zero-crossing detection circuit is delayed or advanced from the actual alternating current zero point is solved, the accuracy of zero-crossing detection is improved, and the anti-interference capability in zero-crossing detection is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of circuits, in particular to a zero-crossing detection signal adjusting method, a zero-crossing detection signal adjusting device, terminal equipment and a medium.
Background
The PG motor is one of main motors used in the field of industrial production, is a motor combining a single-phase alternating current motor and a speed sensor, and is mainly used for predicting the running speed of the motor and detecting a zero-crossing signal of a power supply for chopping by using a feedback signal sent by a PG motor feedback circuit when the motor works normally, and then realizing the effective control of the rotating speed of the motor. In the air-conditioning industry, the indoor unit uses a PG motor to realize stable adjustment of the wind speed.
However, when the double-edge detection scheme in the prior art is used for detecting the zero-crossing detection signal, the detected zero-crossing detection signal is advanced or delayed for a certain time compared with the actual zero-crossing point of the alternating current, and the advanced or delayed time is influenced by temperature and fluctuates, so that the accuracy of the zero-crossing detection cannot be controlled.
Disclosure of Invention
The embodiment of the invention provides a zero-crossing detection signal adjusting method, a zero-crossing detection signal adjusting device, terminal equipment and a medium, effectively improves the accuracy of zero-crossing detection, and improves the anti-interference capability during zero-crossing detection.
In a first aspect, an embodiment of the present invention provides a zero-crossing detection signal adjusting method, including:
acquiring a zero-crossing detection signal detected and output by a zero-crossing detection circuit;
when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse;
the pulse width of an active pulse is saved for use in adjusting the position of the next active pulse.
In a second aspect, an embodiment of the present invention further provides a zero-crossing detection signal adjusting apparatus, including:
the acquisition module is used for acquiring a zero-crossing detection signal output by the zero-crossing detection circuit;
the adjusting module is used for adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse when the current pulse of the zero-crossing detection signal is the effective pulse;
and the saving module is used for saving the pulse width of the effective pulse so as to adjust the position of the next effective pulse.
In a third aspect, an embodiment of the present invention further provides a terminal device, including:
one or more processors;
storage means for storing one or more programs;
the one or more programs are executed by the one or more processors to cause the one or more processors to implement the zero crossing detection signal adjustment method provided by the embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the zero-crossing detection signal adjusting method provided in the embodiment of the present invention.
The embodiment of the invention provides a zero-crossing detection signal adjusting method, a zero-crossing detection signal adjusting device, terminal equipment and a medium, wherein a zero-crossing detection signal output by a zero-crossing detection circuit is obtained; then when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse; finally, the pulse width of the effective pulse is saved for adjusting the position of the next effective pulse. The scheme can effectively adjust the position of the next effective pulse based on the pulse width of the effective pulse, solves the technical problem that the zero point represented by the zero-crossing detection signal detected by the zero-crossing detection circuit is delayed or advanced from the actual alternating current zero point, improves the accuracy of zero-crossing detection, and improves the anti-interference capability during zero-crossing detection.
Drawings
Fig. 1 is a schematic flowchart of a zero-crossing detection signal adjusting method according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a PG motor control of an air conditioner indoor unit in the related art;
FIG. 3 is a schematic waveform diagram illustrating a PG motor control of an indoor unit of an air conditioner according to the related art;
FIG. 4 is a schematic diagram of a double edge detection circuit provided in the related art;
fig. 5 is a schematic structural diagram of a zero-crossing detection circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a key waveform of a zero-crossing detection circuit according to an embodiment of the present invention;
fig. 7 is a schematic waveform diagram illustrating a dual edge detection circuit according to an embodiment of the present invention when detecting an anomaly;
fig. 8 is a schematic flowchart of a zero-crossing detection signal adjusting method according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a zero-crossing detection signal adjusting apparatus according to a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of a terminal device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
Before discussing exemplary embodiments in greater detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
The term "include" and variations thereof as used herein are intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment".
It should be noted that the terms "first", "second", etc. mentioned in the present invention are only used for distinguishing the corresponding contents, and are not used for limiting the order or interdependence relationship.
It is noted that references to "a", "an", and "the" modifications in the present invention are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that reference to "one or more" unless the context clearly dictates otherwise.
Example one
Fig. 1 is a flowchart of a zero-crossing detection signal adjusting method according to an embodiment of the present invention, where the method is applicable to a condition of adjusting a zero-crossing detection signal of a PG motor, and the method may be executed by a zero-crossing detection signal adjusting apparatus, where the apparatus may be implemented by software and/or hardware and is generally integrated on a terminal device, where in this embodiment, the terminal device includes but is not limited to: and (4) a computer.
Fig. 2 is a schematic block diagram of a PG motor control principle of an air-conditioning indoor unit in the related art, and as shown in fig. 2, the PG motor is controlled by changing the waveform of the motor terminal voltage by changing the conduction angle of a bidirectional thyristor in a PG motor control circuit, so that the effective value of the motor terminal voltage is changed, and the purpose of speed regulation is achieved. The PG motor feedback circuit sends a feedback signal to predict the running speed of the motor, so that the effective control of the rotating speed of the motor is realized. The zero-crossing sampling circuit is used for detecting a zero-crossing signal of the PG motor to obtain a zero-crossing detection signal. The zero-crossing signal can represent a signal of the theoretical zero-crossing time of the PG motor. The zero-cross detection signal can be considered as a signal representing the zero-cross point timing actually detected by the PG motor.
The rotating speed of the PG motor can be controlled by the conduction angle of the silicon controlled rectifier, and the power supply voltage of the motor is controlled by the silicon controlled rectifier to realize the conversion of the rotating speed.
Fig. 3 is a waveform diagram illustrating control of a PG motor of an air conditioner indoor unit in the related art. As shown in fig. 3, when the thyristor conduction angle α 1 is not less than 180 °, the voltage waveform at the motor end is a sine wave, i.e., a fully-on state; when the silicon controlled rectifier conduction angle alpha 1 is covered to 180 degrees, the voltage waveform of the motor end is shown as a solid line in the figure, namely, the motor end is in a non-full conduction state, and the effective value is reduced; the smaller the alpha 1 is, the smaller the conducting state is, the smaller the effective value of the voltage is, the smaller the torque of the generated magnetic field is, the lower the rotating speed of the motor is, and the thyristor is cut off after the voltages at two ends of T1 and T2 are reversed in the alternating current input bidirectional thyristor application circuit, so that a signal needs to be driven to the G pole of the bidirectional thyristor after each alternating current AC zero crossing, and the bidirectional thyristor can continuously run. Therefore, zero-crossing signals of the AC must be detected, zero-crossing detection of the PG motor includes single-edge detection and double-edge detection, and single-edge detection leads to unbalanced positive and negative half-cycle control to influence the stable rotating speed of PG control due to the fact that the positive half-cycle detection leads the zero-crossing point and the negative half-cycle detection lags the zero-crossing point, so that sampling double-edge detection in the general industry is widely applied.
Fig. 4 is a schematic diagram of a double-edge detection circuit provided IN the related art, as shown IN fig. 4, the double-edge detection circuit outputs a sinusoidal envelope waveform through full-wave rectification of D1 and D2, controls the light emitting intensity of the internal light emitting diode of the TC through R3 and R4 voltage division and current limiting, and controls the operating state of the internal phototransistor, that is, when the LN voltage Vac is greater than a certain value Von, the generated current enables the light emitting intensity of the internal light emitting diode of the TC to maintain the internal phototransistor on, so that the IQ1_ b current is generated on the Q1 to be greater than the on current, the CE pole of the Q1 is on, a low level is generated on the ZERO _ IN, and when the LN voltage Vac is less than a certain value (close to the AC ZERO), the generated current enables the light emitting intensity of the internal light emitting diode of the TC to maintain the off, so that the IQ1_ b current is generated on the Q1 to be less than the on current, the CE pole of the ZERO is off, a high level is generated on the ro _ zen _ IN, and a rising low level is a ZERO-crossing detection signal.
The commonly used double-edge detection needs to be stopped when the LN voltage Vac is smaller than a certain value Von, so that a zero-crossing detection rising edge signal ZER _ IN is advanced by t0 time compared with an actual AC zero crossing point, and t0 fluctuates under the influence of temperature, so that the zero-crossing detection accuracy cannot be controlled.
In order to solve the technical problem, as shown in fig. 1, a zero-crossing detection signal adjusting method provided by an embodiment of the present invention includes the following steps:
and S110, acquiring a zero-crossing detection signal detected and output by the zero-crossing detection circuit.
In the present embodiment, the zero-cross detection circuit can be regarded as a circuit that performs zero-point detection on alternating current. The detection output of the zero-crossing detection circuit is a zero-crossing detection signal. The zero-crossing detection circuit may be a double-edge detection circuit, i.e., a circuit that performs double-edge detection. The zero-crossing detection circuit may be any zero-crossing detection circuit in the related art, and the zero-crossing detection circuit is not limited herein.
The zero-crossing signal in fig. 3 can be regarded as a signal characterizing the instant of the zero-crossing of the alternating current. The high level position of the zero-crossing signal indicates the zero-crossing point of the alternating current. The driving angle may be determined by the falling edge of the zero-crossing signal, as shown in fig. 3, or by the rising edge of the zero-crossing signal.
The zero-cross detection signal may be a rectangular wave composed of a high level and a low level. Specific values of the high level and the low level are not limited, for example, a voltage value of 0 corresponds to the low level, a voltage value greater than a certain value corresponds to the high level, and the certain value may be determined based on an actual scene without limitation. The current pulse may comprise a signal of one period in the zero crossing detection signal. Illustratively, the zero-crossing detection signal is a rectangular wave, and the zero-crossing detection signal includes a plurality of periodically occurring high levels. The present invention can analyze the high level in the current pulse.
The terminal device can acquire the zero-crossing detection signal output by the zero-crossing detection circuit, and the zero-crossing detection signal is analyzed to realize the adjustment of the zero-crossing detection signal.
And S120, when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse.
In this embodiment, when the zero-crossing detection signal is adjusted, the adjusted zero-crossing detection signal may be obtained in real time. When detecting each pulse of the zero-crossing detection signal, the detection is performed pulse by pulse. The current pulse is a pulse of one cycle currently detected. The effective pulse can be considered as the pulse corresponding to the actual zero crossing of the alternating current. The last valid pulse may be considered to be the last valid pulse of the current pulse.
In this step, it may be determined whether the current pulse of the zero-crossing detection signal is an effective pulse, and if so, the position of the current pulse is adjusted according to the pulse width of the last effective pulse. The present embodiment does not limit how to determine whether the current pulse is a valid pulse, and for example, the present step may trigger the detection of the current pulse at the time of a rising edge or a falling edge of the zero-crossing detection signal, where the current pulse may be regarded as a pulse occurring after the rising edge or the falling edge. At the time of rising edge triggering, whether the current pulse is an effective pulse is determined by detecting the duration of the high level. At the time of a falling edge trigger, it is determined whether the current pulse is an active pulse by detecting the duration of the low level.
This step first determines whether the current pulse is a valid pulse that can filter out interfering signals.
After the current pulse is determined to be an effective pulse, in order to solve the problem that the zero point detected by the current pulse is earlier than the actual alternating current zero-crossing point, the pulse width of the last effective pulse can be used for adjusting the position of the current pulse of the zero-crossing detection signal. Specifically, the position of the current pulse is shifted by 1/n of the pulse width of the previous effective pulse, where the shifting includes forward shifting and backward shifting, for example, the shift is shifted by 1/n of the pulse width of the previous effective pulse backward, that is, the time of the rising edge and the falling edge of the current pulse is delayed by 1/n of the pulse width of the previous effective pulse, and the value of n is not limited, for example, 2.
It should be noted that when determining that the current pulse of the zero-crossing detection signal is a valid pulse, the pulse width of the current pulse may be determined. When the current pulse is an effective pulse, the pulse width of the current pulse is saved for adjusting the position of the next effective pulse.
And S130, saving the pulse width of the effective pulse to adjust the position of the next effective pulse.
After the current pulse of the zero-crossing detection signal is an effective pulse, the pulse width of the current pulse may be saved for adjusting the position of the next effective pulse, and the method for adjusting the position of the next effective pulse is the same as the method for adjusting the position of the current pulse, which is not limited herein. The next effective pulse is the next effective pulse of the current pulse when the current pulse is the effective pulse.
The embodiment of the invention provides a zero-crossing detection signal adjusting method, which comprises the steps of firstly obtaining a zero-crossing detection signal output by a zero-crossing detection circuit; then when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse; finally, the pulse width of the effective pulse is saved for adjusting the position of the next effective pulse. By utilizing the technical scheme, the position of the next effective pulse can be effectively adjusted based on the pulse width of the effective pulse, the technical problem that the zero point represented by the zero-crossing detection signal detected by the zero-crossing detection circuit is delayed or advanced from the actual alternating current zero point is solved, the accuracy of zero-crossing detection is improved, and the anti-interference capability in zero-crossing detection is improved.
On the basis of the above-described embodiment, a modified embodiment of the above-described embodiment is proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the modified embodiment.
In one embodiment, the zero-crossing detection circuit includes: the device comprises a rectification module and a zero-crossing detection module;
the rectification output end of the rectification module is connected with the zero-crossing detection end of the zero-crossing detection circuit;
the rectification module is used for rectifying an alternating current signal input by the rectification input end of the rectification module to obtain a rectified voltage signal;
the zero-crossing detection module is used for carrying out zero-crossing detection on the rectified voltage signal through the optocoupler to obtain a zero-crossing detection signal.
And the rectification output end of the rectification module is used for inputting the rectified voltage signal into the zero-crossing detection module. After acquiring the rectified voltage signal, a zero-crossing detection end of the zero-crossing detection module performs zero-crossing detection, namely zero-crossing detection, so as to obtain a zero-crossing detection signal. The invention can adopt the zero-crossing detection signal provided by the embodiment to detect the zero-crossing detection signal. And then, the zero-crossing detection signal is adjusted by the zero-crossing detection signal adjusting method provided by the embodiment of the invention.
In one embodiment, the zero-crossing detection module includes a voltage dividing unit, the voltage dividing unit is connected to the optocoupler, a voltage drop of the voltage dividing unit is associated with a target voltage value, and the target voltage value is a voltage value for controlling the optocoupler to be switched from a conducting state to a cut-off state.
The zero-crossing detection module comprises a voltage division unit which can divide the rectified voltage signal. The specific circuit of the voltage dividing unit is not limited herein as long as voltage division can be achieved, for example, the voltage dividing unit includes a voltage dividing resistor. The divider resistor can be an adjustable resistor or a resistor with a fixed resistance value. The target voltage value is adjusted by adjusting the resistance value of the divider resistor.
One end of the voltage division unit can be used as a zero-crossing detection end, and the other end of the voltage division unit can be connected to a first input end of the optocoupler. The voltage division unit can play a role in voltage division in the zero-crossing detection module.
In one embodiment, one end of the voltage dividing unit is a zero-crossing detection end, the other end of the voltage dividing unit is respectively connected with one end of a first current-limiting resistor and a first input end of the optocoupler, a second input end of the optocoupler and the other end of the first current-limiting resistor are connected to the ground, a first output end of the optocoupler is connected to one end of a second current-limiting resistor and one end of a filter resistor, the other end of the second current-limiting resistor is connected to a power supply, the other end of the filter resistor is connected with a filter capacitor, the other end of the filter capacitor is connected to the ground and a second output end of the optocoupler, and a connecting end of the filter resistor and the filter capacitor is an output end of the zero-crossing detection module.
Fig. 5 is a schematic structural diagram of a zero-cross detection circuit provided in an embodiment of the present application, referring to fig. 5, taking that a voltage dividing unit only includes a voltage dividing resistor R1 as an example, one end of the voltage dividing resistor R1 included in a zero-cross detection module is used as a zero-cross detection end of the zero-cross detection module, and the other end is respectively connected to a first current limiting resistor R2 and a first input end of an optical coupler U1. The second input end of the optical coupler U1 is respectively connected with the other end of the first current-limiting resistor R2 and the ground, the first output end of the optical coupler U1 is connected with one end of the second current-limiting resistor R3 and the filter resistor R4, the other end of the second current-limiting resistor R3 is connected to the power supply V2, the other end of the filter resistor R4 is connected with one end of the filter capacitor C2, and the other end of the filter capacitor C2 is respectively connected with the second output end of the optical coupler and the ground. The other end of the filter resistor R4 is used as the output end of the zero-crossing detection circuit and is used for outputting a zero-crossing detection signal.
The zero-crossing detection circuit shown in fig. 5 can be regarded as a double-edge detection circuit, and mainly comprises a full-wave rectifier bridge D1-D4, a rectifier diode D5 and a power supply filter capacitor C1, and the zero-crossing detection optocoupler circuit is also called a zero-crossing detection module. An alternating current power supply V1 input by the zero-crossing detection circuit is rectified by rectifier diodes D1-D4 and then stored for a power supply filter capacitor C1 through a diode D5 to form stable direct current voltage for the switching power supply. Due to the unidirectional conduction effect of the rectifier diode, the direct-current voltage of the anode of the power supply filter capacitor C1 and the voltage of the sinusoidal envelope rectified by the rectifier diodes D1-D4 can be separated, so that the rectified voltage signal V _ Rectify is the voltage of the full-wave rectified sinusoidal envelope. The rectified voltage signal V _ Rectify is subjected to voltage division and current limitation through a voltage division resistor R1 and a first current limiting resistor R2, and the current I _ tc generating the sine half-wave envelope flows into a light emitting diode inside the optical coupler U1 to generate corresponding light intensity, so that a phototriode inside the optical coupler U1 is conducted, and a low level is generated on a Zero-crossing detection signal V _ Zero. When the rectified voltage signal V _ Rectify gradually drops to a V _ Rectify _ OFF value, i.e. a target voltage value, from a peak, I _ tc flowing through the optical coupler U1 also drops to a value that cannot maintain the conduction of the light emitting diode, i.e. the light emitting diode is cut OFF so that the I _ tc approaches Zero, at this time, the phototriode of the optical coupler U1 is switched from conduction to cut-OFF, a high level is generated in the Zero-crossing detection signal V _ Zero, the process of the alternating current AC voltage changing from peak to Zero can be detected by the process of the Zero-crossing detection signal V _ Zero changing from low level to high level, the process of the AC voltage changing from Zero to peak can be detected by the process of the Zero-crossing detection signal V _ Zero changing from high level to low level, and the continuous process of the high level of the Zero-crossing detection signal V _ Zero is the process of the AC voltage Zero-crossing commutation. The value of V _ recovery _ OFF can be determined by adjusting the voltage dividing resistor R1 according to application requirements, and the smaller the voltage dividing resistor R1, the closer the corresponding V _ recovery _ OFF is to zero voltage, but considering power consumption, the voltage dividing resistor R1 cannot be selected to be too small. The filter resistor R4 and the filter capacitor C2 are used for filtering collector signals of the photosensitive triode in the optocoupler U1, so that the anti-interference capability is improved.
The continuous high level of the zero-crossing detection signal detected by the related technology is narrower, when the AC power grid has distortion or the zero crossing point is interfered, similar high-level pulse width signals are easily generated, and the error control of the zero-crossing detection is caused, the phenomenon that the motor stops rotating or the rotating speed is suddenly high or suddenly low can be caused by the influence, the stable work of the system can be seriously influenced, and the use comfort of the product is influenced. The zero-crossing detection circuit provided by the invention can correspondingly adjust the high-level pulse width by arranging the voltage division unit, and judges whether the current pulse is an effective pulse by combining a zero-crossing detection signal adjusting method, thereby solving the technical problem.
Compared with the zero-crossing detection circuit in the related art, the zero-crossing detection circuit provided by the invention has the advantages of simple circuit, easy PCB design and low cost. It should be noted that, in the related art, a rectifying module is also required to be provided to implement the zero-crossing detection, and the complexity of the rectifying module in the related art is greater than or equal to that of the rectifying module of the present invention.
Fig. 6 is a schematic diagram of a key waveform of a zero-crossing detection circuit according to an embodiment of the present invention. Fig. 6 shows a full-wave rectified sinusoidal envelope voltage signal, i.e. the rectified voltage signal V _ Rectify, the sinusoidal envelope current I _ tc and the Zero crossing detection signal V _ Zero.
Because a certain current is needed for the conduction of the optocoupler U1, a Zero-crossing detection signal V _ Zero edge signal can have time advance and lag with an actual AC Zero crossing point, if the Zero-crossing detection signal V _ Zero edge signal is not processed, the Zero-crossing control of the PG motor is directly carried out by using a rising edge or a falling edge, so that the control precision is not high, and the PG motor cannot be suitable for the change of different input voltages and temperatures when the fixed time length t _ delay is used for compensation and control. According to the waveform characteristics of the Zero-crossing detection circuit, the AC voltages corresponding to the rising edge and the falling edge of the Zero-crossing detection signal V _ ZREO are symmetrical, so that the scheme adopts software to calculate the high-level pulse width of the Zero-crossing detection signal V _ Zero signal, and half of the pulse width time is compensated into the driving signal, so that the accurate Zero-crossing detection point, namely the adjusted Zero-crossing detection signal, can be obtained. Meanwhile, in order to prevent narrow pulse width interference of a Zero-crossing detection signal V _ Zero signal caused by AC voltage abnormity, a state judgment is carried out on a V _ Zero high level at a timing t _ Filter after the rising edge of the Zero-crossing detection signal is detected, if the V _ Zero high level is high level, control processing is continued, and if not, the signal is removed to wait for triggering of the next rising edge.
Fig. 7 is a schematic waveform diagram of the double-edge detection circuit according to the embodiment of the present invention when detecting an abnormality, see fig. 7, when an ac voltage is abnormal, the rectified voltage signal V _ Rectify is abnormal, and the zero-crossing detection signal V _ ZREO erroneously detects a zero point at the abnormal position, such as the zero point detected between the abscissa 4-6 in fig. 7, where the high pulse may be regarded as a narrow pulse width interference.
Example two
Fig. 8 is a schematic flowchart of a zero-crossing detection signal adjusting method according to a second embodiment of the present invention, and the second embodiment is optimized based on the foregoing embodiments. In this embodiment, determining that the current pulse is a valid pulse further embodies the following operations:
when the rising edge of a zero-crossing detection signal is detected, starting a timer and determining the pulse width of the current pulse of the zero-crossing detection signal;
after the timer finishes timing, if the zero-crossing detection signal is at a high level, determining that the current pulse of the zero-crossing detection signal is an effective pulse.
Further, the method specifically includes clearing timing and clearing the pulse width of the current pulse of the zero-crossing detection signal if the zero-crossing detection signal is at a low level after the timing of the timer is finished. The current pulse of the zero-crossing detection signal is an invalid pulse.
Further, this embodiment further adjusts the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last valid pulse, and further embodies that:
and shifting the current pulse of the zero-crossing detection signal by a target time length, wherein the target time length is half of the pulse width of the last effective pulse.
Please refer to the first embodiment for a detailed description of the present embodiment.
As shown in fig. 8, a zero-crossing detection signal adjusting method provided in the second embodiment of the present invention includes the following steps:
and S210, acquiring a zero-crossing detection signal output by the zero-crossing detection circuit.
And S220, starting a timer and determining the pulse width of the current pulse of the zero-crossing detection signal when the rising edge of the zero-crossing detection signal is detected.
In this embodiment, the detection of the effective pulse may be performed by triggering a rising edge of the zero-crossing detection signal, and when performing side detection, a timer may be started to determine whether a high level after the rising edge can be maintained for a set time. The setting of the set time length is not limited and can be determined based on practical application scenarios, such as pulse width determination based on alternating current and narrow pulse width interference.
The timing manner of the timer is not limited herein as long as the timer can time.
After the rising edge of the zero-crossing detection signal is detected, the pulse width of the current pulse of the zero-crossing detection signal may be determined, and the technical means for determining the pulse width is not limited herein, such as determining the pulse width of the current pulse by the time corresponding to the rising edge and the falling edge of the current pulse.
The invention can determine whether the pulse width of the current pulse is effective or not by timing judgment through the timer, and can also judge whether the rising edge of the current pulse is effective or not. The drive conduction angle or the drive signal of the PG motor can be calculated and controlled in real time at each rising edge time of the zero-crossing detection signal, that is, based on the rising edge of the zero-crossing detection signal.
S230, after the timer finishes timing, determining whether the zero-crossing detection signal is at a high level, if so, executing S240; otherwise, S250 is executed.
After the timer is timed, also called as timing, it may be determined whether the current zero-crossing detection signal is at a high level, if so, the current pulse may be considered as a valid pulse, that is, S240 is performed. If not, the current pulse may be considered as an interference pulse, and S250 is performed.
The set time duration corresponding to the timer may be less than the pulse width of the effective pulse corresponding to the zero-crossing point of the alternating current, and the specific value is not limited here.
The timer is set to filter out narrow pulse interference by judging whether the zero-crossing detection signal is in a high level after the timer finishes timing.
S240, determining the current pulse of the zero-crossing detection signal as an effective pulse, and executing S260.
And S250, clearing timing and the pulse width of the current pulse of the zero-crossing detection signal, and returning to execute S220.
When the zero-crossing detection signal is at a low level after the timing is finished, the current pulse can be regarded as an interference pulse, namely an invalid pulse, the timing can be cleared, the pulse width of the current pulse of the zero-crossing detection signal is cleared, namely the pulse width of the current pulse is not stored, the next rising edge is continuously triggered, and the step returns to S220 to use the next pulse corresponding to the next rising edge of the zero-crossing detection signal as the current pulse to continuously adjust the zero-crossing detection signal.
The current pulse of the zero-crossing detection signal is an invalid pulse.
And S260, translating the current pulse of the zero-crossing detection signal by a target time length, wherein the target time length is half of the pulse width of the last effective pulse.
This step may shift the current pulse by the target duration while adjusting the position of the current pulse. Such as delaying the current pulse by the target duration.
The zero point of the common alternating current appears at the midpoint position of the high pulse in the zero-crossing detection signal, and when the current pulse is adjusted, the invention can set half of the pulse width of the last effective pulse as the target duration.
And S270, saving the pulse width of the effective pulse to adjust the position of the next effective pulse.
The present invention can continuously adjust each pulse of the zero crossing detection signal.
An example of this embodiment is described below:
acquiring a real-time zero-crossing detection signal, waiting for the triggering of a rising edge of the zero-crossing detection signal when the zero-crossing detection signal is regulated, starting a timer after the rising edge is detected, determining the high-level pulse width, detecting whether the zero-crossing detection signal is at the high level after the time of the timer is up, and if not, clearing the timing and the pulse width, namely the pulse width is not stored; if yes, compensating half of the last saved pulse width into the conduction angle of the bidirectional controllable silicon controlled rectifier driven and controlled by the PG motor, namely adjusting the position of the current pulse based on half of the pulse width of the last effective pulse so as to further adjust the time when the rising edge of the driving signal occurs. The precision of zero-crossing detection is improved, meanwhile, interference signals are eliminated by judging the high level of the zero-crossing detection signals, and the stability of PG motor control is improved.
In addition, the calculated pulse width is saved for adjustment of the next effective pulse position.
The zero-crossing detection signal adjusting method provided by the second embodiment of the invention embodies the operation of determining the effective pulse and the operation of adjusting the position of the current pulse. By the method, the effectiveness of the current pulse can be effectively verified, and when the current pulse is an effective pulse, the current pulse is accurately adjusted based on the target duration, so that the accuracy of zero point detection is improved.
EXAMPLE III
Fig. 9 is a schematic structural diagram of a zero-crossing detection signal adjusting apparatus according to a third embodiment of the present invention, where the apparatus is applicable to a case where zero-crossing detection signals of a PG motor are adjusted, where the apparatus can be implemented by software and/or hardware and is generally integrated on a terminal device.
As shown in fig. 9, the apparatus includes:
the acquiring module 91 is configured to acquire a zero-crossing detection signal output by the zero-crossing detection circuit;
the adjusting module 92 is configured to adjust a position of the current pulse of the zero-crossing detection signal according to a pulse width of a previous effective pulse when the current pulse of the zero-crossing detection signal is an effective pulse;
a saving module 93 for saving the pulse width of the effective pulse for adjusting the position of the next effective pulse.
In this embodiment, the apparatus first obtains a zero-crossing detection signal output by the zero-crossing detection circuit through the obtaining module 91; then, when the current pulse of the zero-crossing detection signal is an effective pulse, the position of the current pulse of the zero-crossing detection signal is adjusted through the adjusting module 92 according to the pulse width of the last effective pulse; finally, the pulse width of the active pulse is saved by the saving module 93 for adjusting the position of the next active pulse.
The embodiment provides a zero-crossing detection signal adjusting device, which can effectively adjust the position of the next effective pulse based on the pulse width of the effective pulse, solves the technical problem that the zero point represented by the zero-crossing detection signal detected by a zero-crossing detection circuit is delayed or advanced from the actual alternating current zero point, improves the accuracy of zero-crossing detection, and improves the anti-interference capability during zero-crossing detection.
In one embodiment, the adjustment module 92, when determining the valid pulse, determines that the current pulse is the valid pulse by:
when the rising edge of a zero-crossing detection signal is detected, starting a timer and determining the pulse width of the current pulse of the zero-crossing detection signal;
after the timer finishes timing, if the zero-crossing detection signal is at a high level, determining that the current pulse of the zero-crossing detection signal is an effective pulse.
In one embodiment, the apparatus further comprises a purge module to:
and after the timer finishes timing, if the zero-crossing detection signal is at a low level, timing is cleared and the pulse width of the current pulse of the zero-crossing detection signal is cleared.
In one embodiment, the adjusting module 92 adjusts the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last valid pulse, including:
and translating the current pulse of the zero-crossing detection signal by a target time length, wherein the target time length is half of the pulse width of the last effective pulse.
In one embodiment, the zero-crossing detection circuit includes: the device comprises a rectification module and a zero-crossing detection module;
the rectification output end of the rectification module is connected with the zero-crossing detection end of the zero-crossing detection circuit;
the rectification module is used for rectifying an alternating current signal input by the rectification input end of the rectification module to obtain a rectified voltage signal;
the zero-crossing detection module is used for carrying out zero-crossing detection on the rectified voltage signal through the optocoupler to obtain a zero-crossing detection signal.
In one embodiment, the zero-crossing detection module includes a voltage dividing unit, the voltage dividing unit is connected to the optocoupler, a voltage drop of the voltage dividing unit is associated with a target voltage value, and the target voltage value is a voltage value for controlling the optocoupler to be switched from a conducting state to a cut-off state.
In one embodiment, one end of the voltage division unit is a zero-crossing detection end, the other end of the voltage division unit is respectively connected with one end of a first current-limiting resistor and a first input end of an optical coupler, a second input end of the optical coupler and the other end of the first current-limiting resistor are connected to the ground, a first output end of the optical coupler is respectively connected to one end of a second current-limiting resistor and one end of a filter resistor, the other end of the second current-limiting resistor is connected to a power supply, the other end of the filter resistor is connected with a filter capacitor, the other end of the filter capacitor is connected to the ground and a second output end of the optical coupler, and the connecting end of the filter resistor and the filter capacitor is an output end of the zero-crossing detection module.
The zero-crossing detection signal adjusting device can execute the zero-crossing detection signal adjusting method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 10 is a schematic structural diagram of a terminal device according to a fourth embodiment of the present invention. As shown in fig. 10, a terminal device provided in the fourth embodiment of the present invention includes: one or more processors 41 and storage 42; the processor 41 in the terminal device may be one or more, and one processor 41 is taken as an example in fig. 4; storage 42 is used to store one or more programs; the one or more programs are executed by the one or more processors 41 such that the one or more processors 41 implement a method as in any of the embodiments of the invention.
The terminal device may further include: an input device 43 and an output device 44.
The processor 41, the storage device 42, the input device 43 and the output device 44 in the terminal equipment may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 4.
The storage device 42 in the terminal device serves as a computer-readable storage medium, and may be used to store one or more programs, which may be software programs, computer-executable programs, and modules, and program instructions/modules corresponding to the zero-crossing detection signal adjusting method according to the embodiment of the present invention (for example, the modules in the zero-crossing detection signal adjusting device shown in fig. 9 include an obtaining module 91, an adjusting module 92, and a saving module 93). The processor 41 executes various functional applications and data processing of the terminal device by running software programs, instructions and modules stored in the storage device 42, namely, the zero-crossing detection signal adjusting method in the above method embodiment is realized.
The storage device 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the storage 42 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, storage 42 may further include memory located remotely from processor 41, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 43 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal device. The output device 44 may include a display device such as a display screen.
And, when the one or more programs included in the above-mentioned terminal device are executed by the one or more processors 41, the programs perform the following operations:
acquiring a zero-crossing detection signal detected and output by a zero-crossing detection circuit;
when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse;
the pulse width of an active pulse is saved for use in adjusting the position of the next active pulse.
EXAMPLE five
An embodiment five of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, is configured to execute a zero-crossing detection signal adjusting method, where the method includes:
acquiring a zero-crossing detection signal detected and output by a zero-crossing detection circuit;
when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse;
the pulse width of an active pulse is saved for adjusting the position of the next active pulse.
Optionally, the program may be further configured to perform the zero crossing detection signal adjusting method provided in any embodiment of the present invention when executed by the processor.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. A zero crossing detection signal conditioning method, the method comprising:
acquiring a zero-crossing detection signal detected and output by a zero-crossing detection circuit;
when the current pulse of the zero-crossing detection signal is an effective pulse, adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse;
the pulse width of the active pulse is saved for use in adjusting the position of the next active pulse.
2. The method of claim 1, wherein determining that the current pulse is a valid pulse comprises:
when the rising edge of the zero-crossing detection signal is detected, starting a timer and determining the pulse width of the current pulse of the zero-crossing detection signal;
and after the timer finishes timing, if the zero-crossing detection signal is at a high level, determining that the current pulse of the zero-crossing detection signal is an effective pulse.
3. The method of claim 2, further comprising:
and after the timer finishes timing, if the zero-crossing detection signal is at a low level, timing is cleared and the pulse width of the current pulse of the zero-crossing detection signal is cleared.
4. The method of claim 1, wherein the adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last valid pulse comprises:
and translating the current pulse of the zero-crossing detection signal by a target time length, wherein the target time length is half of the pulse width of the last effective pulse.
5. The method of claim 1, wherein the zero crossing detection circuit comprises: the device comprises a rectification module and a zero-crossing detection module;
the rectification output end of the rectification module is connected with the zero-crossing detection end of the zero-crossing detection circuit;
the rectification module is used for rectifying an alternating current signal input by the rectification input end of the rectification module to obtain a rectified voltage signal;
the zero-crossing detection module is used for carrying out zero-crossing detection on the rectified voltage signal through an optocoupler to obtain a zero-crossing detection signal.
6. The method according to claim 5, wherein the zero-crossing detection module comprises a voltage dividing unit, the voltage dividing unit is connected with the optical coupler, a voltage drop of the voltage dividing unit is associated with a target voltage value, and the target voltage value is a voltage value for controlling the optical coupler to be changed from an on state to an off state.
7. The method according to claim 6, wherein one end of the voltage dividing unit is the zero-crossing detection end, the other end of the voltage dividing unit is respectively connected with one end of a first current-limiting resistor and a first input end of the optical coupler, a second input end of the optical coupler and the other end of the first current-limiting resistor are connected to ground, a first output end of the optical coupler is respectively connected with one end of a second current-limiting resistor and one end of a filter resistor, the other end of the second current-limiting resistor is connected to a power supply, the other end of the filter resistor is connected with a filter capacitor, the other end of the filter capacitor is connected to ground and a second output end of the optical coupler, and a connection end of the filter resistor and the filter capacitor is an output end of the zero-crossing detection module.
8. A zero-crossing detection signal adjusting apparatus, comprising:
the acquisition module is used for acquiring a zero-crossing detection signal output by the zero-crossing detection circuit;
the adjusting module is used for adjusting the position of the current pulse of the zero-crossing detection signal according to the pulse width of the last effective pulse when the current pulse of the zero-crossing detection signal is the effective pulse;
and the saving module is used for saving the pulse width of the effective pulse so as to adjust the position of the next effective pulse.
9. A terminal device, comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the zero crossing detection signal adjustment method of any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a zero-crossing detection signal adjustment method as claimed in any one of claims 1 to 7.
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