CN209911520U - Power state detection system for power switching device - Google Patents
Power state detection system for power switching device Download PDFInfo
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Abstract
The utility model relates to a power supply state detecting system for power switching device, it includes a transition circuit, an acquisition module, a reference module and a calculation module, wherein the transition circuit changes a power supply's real-time input voltage into an output voltage wave unanimous with the phase place and the frequency of a standard voltage wave of a standard power supply, wherein acquisition module acquires the sampling voltage value of an at least discrete point of this output voltage wave of this power supply, wherein reference module acquires the standard voltage value of an at least matching point of this standard voltage wave of this standard power supply, wherein the matching point with discrete point one-to-one, based on the sampling voltage value with the standard voltage value, wherein calculation module obtains a testing result.
Description
Technical Field
The utility model relates to a power state detection area further relates to a power state detecting system who is used for power switching device.
Background
At present, a power supply switching device (ATS) has been widely used in industries such as power plants, rail transit, data centers, etc., wherein the working process of the power supply switching device is to detect whether there is an abnormality in the voltages of at least two connected power supplies in real time through a power supply state detection system, and when the power supply state detection system detects that there is an abnormality in the voltages of the power supplies on the common side, the ATS can quickly switch a power switch to supply power from the power supply on the standby side, so as to ensure the power utilization safety of loads in the power system. Generally, the detection mechanism of the power state detection system is to determine whether the voltage of the power supply is abnormal based on a set of instantaneous voltage values of the power supply in the real-time acquisition circuit. Therefore, the shorter the detection time required by the detection mechanism of the power state detection system, the faster the ATS can switch the power switch to ensure the safety of the load. In other words, the shorter the detection time of the power detection method of the power state detection system is, the faster the ATS can switch the power switch, thereby maximally shortening the load power-down time caused by the power supply abnormality and ensuring the load power supply safety.
In the conventional power switching device, the specific principle of the power state detection system is to acquire instantaneous voltage values of a plurality of discrete points of the voltage of a power supply of a circuit within a cycle, and then process each instantaneous voltage value by utilizing a root mean square value algorithm to obtain a detection result. The RMS algorithm is to square the instantaneous voltage value of each discrete point to obtain a set of square values, then add the square values of all the instantaneous voltage values, divide the sum by the total number of the discrete points, and then square the sum to obtain a detection value, and then based on the detection value, the power state detection system determines whether the power voltage is abnormal.
Therefore, the conventional power state detection system of the power switching device needs a time window with a certain length of time to collect the instantaneous voltage values of a set of necessary sampling points, and in order to ensure that the detection value obtained by the root-mean-square algorithm can accurately indicate the state of the power supply, the time window must satisfy the length of at least one-quarter cycle (i.e. 5ms), so that the problem is that the time for switching the power switch of the ATS is passively prolonged, which is very unfavorable for the power supply stability of the load.
In other words, the power state detection system of the current power switching device collects the instantaneous voltage value of each sampling point based on the time length of at least 5ms, and then can detect whether the power supply state of the power supply is abnormal, which further causes the switching time of the power switch of the ATS to be long, which is not favorable for the power supply safety of the load.
Therefore, how to further shorten the detection time of the power state detection system, so that the power switching device can switch the power switch more quickly to ensure the safety of the load power supply is a problem that needs to be solved at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power state detecting system for power switching device, compare in traditional power state detecting system, it can shorten the check-out time that detects power state, and then detects out a power supply fast and whether unusual to reduce switch power switch's time by a wide margin, in order to ensure load power supply safety.
Another object of the present invention is to provide a power state detection system for power switching device, which can detect the state of the power supply in the circuit based on the sampling voltage value of a set of discrete points collected in the collection time window less than 5 ms.
Another object of the present invention is to provide a power state detection system for power switching device, which is capable of determining whether the state of the power supply is abnormal or not by collecting the comparison between the sampling voltage value of the discrete point and the standard voltage value of the corresponding matching point of a standard power supply, so as to reduce the detection time.
Another object of the present invention is to provide a power state detection system for a power switching device, which provides a reference database, wherein the reference database is used for storing a standard voltage wave of a standard power source after being recorded in advance.
Another object of the present invention is to provide a power state detection system for a power switching device, which can perform anti-interference processing on the real-time input voltage of the power supply.
Another object of the present invention is to provide a power state detection system for a power switching device, which can ensure real-time performance and reliability of power state detection.
According to the utility model discloses an aspect, the utility model discloses a one-by-one power state detection system is further provided, it includes:
a transition circuit:
an acquisition module:
a reference module; and
the conversion circuit converts real-time input voltage of a power supply into an output voltage wave consistent with the phase and frequency of a standard voltage wave of a standard power supply, the acquisition module acquires a sampling voltage value of at least one discrete point of the output voltage wave of the power supply, the reference module acquires a standard voltage value of at least one matching point of the standard voltage wave of the standard power supply, the matching points are in one-to-one correspondence with the discrete points, and the calculation module acquires a detection result based on the sampling voltage value and the standard voltage value.
In some embodiments, the converting circuit comprises a phase converting circuit, a zero crossing detecting circuit and an operational amplifier circuit, wherein the phase converting circuit converts the real-time input voltage of the power supply into a converted voltage, wherein the converted voltage is equal in phase magnitude to the standard voltage wave, wherein the zero crossing detecting circuit detects a zero crossing of the real-time input voltage based on the converted voltage and the zero crossing, and wherein the operational amplifier circuit outputs the output voltage wave.
In some embodiments, the acquiring module acquires a sampled voltage value of one discrete point at a predetermined interval time within a predetermined acquisition time window, and the reference module acquires a standard voltage value of one matching point at the same predetermined interval time within the same acquisition time window.
In some embodiments, wherein the acquisition module comprises timing sampling from a 0 degree point of one cycle of the output voltage wave.
In some embodiments, wherein the preset acquisition time window is less than 5 ms.
In some embodiments, the calculating module obtains a first calculation result based on whether a difference between a first sampling voltage value and a first standard voltage value is within a reasonable range, and the calculating module obtains the detection result based on the first calculation result.
In some embodiments, the calculating module further comprises obtaining a second calculation result based on whether a difference between a second sampled voltage value and a second standard voltage value is within a reasonable range, wherein the calculating module obtains the detection structure based on the first calculation result and the second calculation result.
In some embodiments, the system further comprises an anti-interference processing module, wherein the anti-interference processing module performs digital filtering processing on the real-time input voltage of the power supply.
In some embodiments, it further comprises a reference database, wherein the standard voltage of the standard power supply
The waves are stored in the reference database after being recorded in advance.
Drawings
Fig. 1 is a block diagram of a power status detection system according to a preferred embodiment of the present invention.
Fig. 2 is a circuit schematic diagram of a transition circuit of the power state detection system according to the above preferred embodiment of the present invention.
Fig. 3 is a schematic waveform diagram of the zero-crossing detection wave and the input voltage wave of the zero-crossing detection circuit of the power state detection system according to the preferred embodiment of the present invention.
Fig. 4 is a waveform diagram of a standard voltage wave pre-stored in the base database of the power status detection system according to the preferred embodiment of the present invention.
Fig. 5 is a schematic flow chart of the calculation detection result of the power state detection system according to the above preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 to 5 show a power state detection system 100 according to a preferred embodiment of the present invention, which is used for a power switching device 200 of a power system 800, wherein the power system 800 includes at least two power sources 810 and 820 and at least one load 830, and the power switching device 200 is operably installed between each of the power sources and the load for switching different power sources to supply power to the load. The power supply state detection system 100 is configured to detect whether an abnormality, such as a voltage loss, a current overload, or a circuit short circuit, occurs in a current power supply state of the power supply of the power system 800 in real time. When the power state detection system detects that the power supply state of the power supply is abnormal, the power switching device 200 can switch the power switch in time, so that the power supply disconnects the circuit, and other power supplies such as a standby power supply access circuit, and further, reliable power is continuously provided for the load.
For example, the power system 800 is implemented as a dual power system, i.e. dual power sources include a power supply 810 and a backup power source 820, wherein the power supply 810 provides normal power to the load on a daily basis, and when the power state detection system 100 detects that the state of the power supply 810 is abnormal, the power switching device 200 disconnects the power switch of the power supply 810 and simultaneously connects the power switch of the backup power source 820, so that the backup power source 820 continues to provide reliable power to the load 830.
It is noted that the real-time input voltage of the power supply 810 is represented in this embodiment as being composed of a set of ac input voltages that vary with time, and thus, the implementation input voltage may also be an input voltage wave.
In this embodiment, the power state detection system 100 detects whether the voltage state of the power supply 810 is abnormal, and further, the power state detection system 100 detects whether the voltage of the power supply 810 is lost in real time to determine whether the power supply state of the power supply 810 is abnormal. It should be understood by those skilled in the art that the power state detection system 100 may also determine whether the power supply state of the power supply 810 is abnormal by detecting whether the current or power of the power supply 810 is abnormal in real time, which is not limited herein.
As shown in fig. 1, the power state detection system 100 preferably includes a conversion circuit 10, an acquisition module 20, a reference module 30, a calculation module 40 and a reference database 50, wherein the conversion circuit 10 is electrically connected to the power supply 810, wherein the conversion circuit 10 converts a real-time input voltage of the power supply 810 into an output voltage wave in accordance with a phase and a frequency of a standard voltage wave of a standard power supply 300 in real time. The collection module 20 is configured to collect sampled voltage values of a set of discrete points of the output power wave of the power supply 810. The reference module 30 is configured to obtain a standard voltage value of a set of matching points of the standard voltage wave of the standard power supply 300, where the matching points have a physical one-to-one correspondence relationship with the discrete points. Based on the sampling voltage value and the standard voltage value, the calculating module 40 obtains a detection result for the power switching apparatus 200 to switch the power switch. The reference database 50 is used for storing the standard voltage waves of the standard power supply 300 which have been recorded.
Further, a power state detection method includes:
converting a real-time input voltage of the power supply 810 into the output voltage wave in accordance with a phase and a frequency of a standard voltage wave of the standard power supply 300;
acquiring a sampled voltage value of at least one discrete point of the output power wave of the power supply 810;
acquiring a standard voltage value of at least one matching point of the standard voltage wave of the standard power supply 300, wherein the matching point corresponds to the discrete point one to one; and
and obtaining the detection result based on the sampling voltage value and the standard voltage value.
As shown in fig. 4, it is worth mentioning that the standard power supply 300 is preferably a three-phase power supply of AC380V, wherein the real-time input voltage of the standard power supply 300 is converted into a three-phase voltage wave through the converting circuit 10, and after the conversion is completed, the three-phase voltage wave is recorded and stored in the reference database 50 as the standard voltage wave. That is, the real-time input voltages of the standard power supply 300 and the power supply 810 are converted into voltage waves of the same phase and frequency by the same conversion circuit 10. In other words, the standard power wave of the standard power supply 300 is used as a reference wave, and the output voltage wave of the power supply 810 is used as a comparison wave, and the power state detection system 100 obtains a detection result of whether the power supply state of the power supply 810 is abnormal or not through comparison calculation.
It is understood that the standard voltage wave of the standard power supply 300 may be stored in the reference database 50 after being recorded in advance. Therefore, the reliability of the standard voltage wave can be secured. Preferably, the reference database 50 is implemented as a memory of the power switching device.
Specifically, the standard voltage wave of the standard power supply 300 is implemented as a sine wave of a sine waveform, wherein the output voltage wave of the power supply 810 is implemented as a pulse wave matched to a pulse waveform of the sine wave. In other words, the phase and frequency of the pulse wave are equal to the phase and frequency of the sine wave.
Further, the transition circuit 10 includes a phase conversion circuit 11, a zero crossing detection circuit 12 and an operational amplifier circuit 13, wherein the phase conversion circuit 11 is configured to convert a real-time input voltage of the power supply 810 into a converted voltage having a phase equal to that of the standard voltage wave, wherein the zero crossing detection circuit 12 is configured to detect a zero crossing of the real-time input voltage of the power supply 810, and based on the zero crossing, the operational amplifier circuit 13 operates to amplify the converted voltage to obtain the output voltage. In other words, the input voltage is converted in real time via the phase conversion circuit 11 to obtain the converted voltage varying with time, and after the operational amplifier circuit 13 operates, the conversion circuit 10 obtains a set of the output voltages varying with time, wherein the output voltages form the output voltage wave.
In the step of converting the real-time input voltage of the power supply 810 into an output voltage wave in accordance with the phase and frequency of the standard voltage wave of the standard power supply 300, the power state detection method includes:
converting the real-time input voltage of the power supply 810 into the converted voltage, wherein the converted voltage is equal in phase magnitude to the standard voltage wave;
detecting a zero crossing point of the real-time input voltage; and
based on the converted voltage and the zero crossing point, the operational amplifier outputs the output voltage wave.
Typically, the power system 800 comprises a low voltage, a medium voltage or a high voltage system, wherein the voltage values of the input voltage of the power supply 810 are different for different voltages of the power system 800. For example, for a medium voltage power system, the voltage application range is 3.6KV-20KV, wherein the input voltage of the power supply 810 is larger. Therefore, in order to prevent the voltage of the input voltage of the power supply 810 from being too large and damaging the components of the operational amplifier circuit 13, the phase conversion circuit 11 is configured to convert the input voltage of the power supply 810 into the low-voltage converted voltage, and then the operational amplifier circuit 13 operates and amplifies the converted voltage to obtain the output voltage wave.
Preferably, the phase converting circuit 11 is implemented as a voltage transformer (PT), wherein the converted voltage converted by the phase converting circuit 11 is V _ N _ AB shown in fig. 2, wherein the magnitude of the converted voltage is a peak value including 1.5VAC, and contains a dc bias voltage of 1.65 VDC. Therefore, the maximum voltage value of the conversion voltage is low, and the components of the operational amplifier circuit 13 can not be damaged.
It should be noted that, after the input voltage of the power supply 810 is converted by the phase conversion circuit 11, the phase changes, and the phase of the converted voltage V _ N _ AB can be adjusted to be the same as the phase of the standard voltage wave according to the type or conversion efficiency of the phase conversion circuit 11.
As shown in fig. 2, the transition circuit 10 further includes a filter capacitor C39, an input matching resistor R42, an amplifier U5B, and a single power supply VCC, wherein the input matching resistor R42 is connected in series with the phase converting circuit 11 to form a first circuit 131, wherein the filter capacitor C39 is connected in series with the single power supply VCC to form a second circuit 132, and wherein the second circuit 132 is connected in parallel with the input matching resistor R42 of the first circuit 131 to form the zero crossing point detecting circuit 12. The first circuit 131 and the second circuit 132 are both connected in series to the op-amp U5B to form the op-amp circuit 13, and output the output voltage wave as FRQ _ N _ AB shown in the figure after passing through the op-amp of the op-amp U5B. That is, the conversion voltage V _ N _ AB varying with time is subjected to the operational amplifier processing of the operational amplifier circuit 13, and then the output voltage wave FRQ _ N _ AB is output.
Preferably, the filter capacitor C39 is a 100nF capacitor, the input matching resistor R42 is a 1.00K Ω resistor, the single power source VCC is a 3.3VDC dc power source, and the operational amplifier U5B is a conventional operational amplifier.
Specifically, the zero-crossing detecting circuit 12 is configured to determine a zero-crossing point of an input voltage waveform of the converted voltage V _ N _ AB, wherein the op amp U5B of the operational amplifier circuit 13 calculates a frequency of the converted voltage V _ N _ AB based on the zero-crossing point of the input voltage waveform, and then outputs the output voltage wave matched with the standard voltage wave through the op amp. In other words, the operational amplifier circuit 13 can detect the zero-crossing points of the input voltage waveform that determines the converted voltage V _ N _ AB and calculate the frequency of the input voltage waveform that obtains the converted voltage V _ N _ AB. That is, the operational amplifier circuit 13 outputs the output voltage wave having a frequency equal to the frequency of the standard voltage wave based on the zero-crossing point of the input voltage waveform of the converted voltage.
Further, based on the zero-crossing point of the input voltage wave of the converted voltage V _ N _ AB, the zero-crossing point detection circuit 12 forms a zero-crossing point detection wave, as shown in fig. 3, the zero-crossing point detection wave formed by the zero-crossing point detection circuit 12 and the input voltage wave of the converted voltage V _ N _ AB, wherein the zero-crossing point detection wave is a square wave, and wherein the input voltage wave is a sine wave. Based on the zero-crossing point detection waveform, the zero-crossing point detection circuit 12 obtains the zero-crossing point of the input voltage waveform of the converted voltage V _ N _ AB, thereby confirming the initial detection phase of the input voltage waveform.
Correspondingly, based on the zero crossing point of the standard voltage wave, the zero crossing point detection circuit 12 can also form a standard voltage zero crossing point detection waveform, and based on the standard voltage zero crossing point detection waveform, the zero crossing point detection circuit 12 obtains the zero crossing point of the standard voltage wave, so as to confirm the initial phase of the standard voltage wave, and further realize recording in advance and storing, so that the subsequent operational amplifier circuit 13 can output the output voltage wave with the same frequency and phase as the standard voltage wave. That is, with the standard voltage wave as the input voltage wave, the zero-crossing point detecting circuit 12 detects a zero-crossing point at which the standard voltage wave is obtained based on the zero-crossing point detecting wave, thereby confirming the initial phase of the standard voltage wave.
It is worth mentioning that the phase of the output voltage wave FRQ _ N _ AB output by the operational amplifier circuit 13 is just opposite to the phase of the converted voltage V _ N _ AB. That is, the phase of the output voltage wave output by the operational amplifier circuit 13 is equal to the phase of the standard voltage wave by the conversion of the phase conversion circuit 11.
It will be understood by those skilled in the art that the transition circuit 10 is capable of determining the zero crossings of the input voltage waveform of the converted voltage V _ N _ AB and calculating the frequency of the input voltage waveform of the converted voltage V _ N _ AB, and after having been amplified by the circuit, outputting the output voltage wave that closely matches the standard voltage wave. Therefore, the purpose of the transition circuit 10 is not changed, and the transition circuit 10 may be implemented as other modified circuits, which is not limited herein. In other words, the number of components of the conversion circuit 10 and the series or parallel connection between the components may be changed within a reasonable range as corresponding changes.
Further, on the basis that the real-time input voltage of the power supply 810 is converted by the conversion circuit 10 to form the output voltage wave, the acquisition module 20 sequentially acquires the sampling voltage values of a group of discrete points of the output voltage wave according to a certain sampling time interval.
Preferably, the acquisition module 20 starts to perform timing sampling from a preset point of each cycle of the output voltage wave, acquires a sampled voltage value of one discrete point every time T0, and sequentially acquires sampled voltage values of N discrete points (Ni, where i ═ 1, 2, and 3.). The preset point is preferably implemented as a 0 degree point of each cycle of the output voltage wave, in other words, the acquisition module 20 acquires the sampled voltage values of the discrete points sequentially from 0 degree of each cycle.
Further, the acquisition module 20 sequentially acquires 64 discrete points of sampled voltage values within each cycle of the output voltage wave. That is, the acquisition module 20 sequentially acquires the sampled voltage values of 64 discrete points at intervals of the time T0 from 0 degrees in each cycle of the output voltage wave within a preset acquisition time window. Therefore, the positions of the discrete points of each cycle of the output voltage wave are separated by a certain time interval from the preset point. In other words, the acquiring module 20 acquires the adopted voltage values of the discrete points at positions n time intervals T0 away from the preset point.
Based on the standard voltage wave stored in the reference database 50, the reference module 30 sequentially obtains the standard voltage values (Mi, where i is 1, 2, and 3.) of N matching points at intervals of the time T0 within the same sampling time window from the preset point of one cycle of the standard voltage wave. In other words, the reference module 30 sequentially acquires the standard voltage values of the matching points of N standard voltage waves every the time interval T0 from 0 degrees of the standard voltage waves. That is, the reference module 30 obtains the standard voltage value of the matching point at a position n time intervals T0 away from the preset point.
In the power state detection method, the step of obtaining a sampled voltage value of at least one discrete point of the output power wave of the power supply includes:
starting timing sampling from a preset point of one cycle of the output voltage wave; and
acquiring a sampling voltage value of one discrete point at certain interval time in the preset acquisition time window;
wherein, in the step of obtaining the standard voltage value of at least one matching point of the standard voltage wave of the standard power supply, the step comprises:
starting timing sampling from the same preset point of one cycle of the standard voltage wave; and
and acquiring a standard voltage value of one matching point at the same interval time within the same acquisition time window.
Wherein the time-counting sampling is started from a 0 degree point of one cycle of the output voltage wave.
Wherein the preset acquisition time window is less than 5 ms.
It can be seen that the matching points have a physical one-to-one correspondence with the discrete points. In other words, since the standard voltage wave and the output voltage wave are consistent in phase and frequency, and 0 degree of the standard voltage wave and 0 degree of the output voltage wave have a physical one-to-one correspondence relationship, every time interval T0, the corresponding discrete point and the corresponding matching point also have a physical one-to-one correspondence relationship. That is, the sampled voltage value N1 of the discrete point corresponds to the standard voltage value M1 of the matching point, wherein the sampled voltage value N2 of the discrete point corresponds to the standard voltage value M2 of the matching point, the sampled voltage value N3 of the discrete point corresponds to the standard voltage value M3 of the matching point, and so on.
Theoretically, when the collecting module 40 collects the sampling voltage value of the discrete point once, the calculating module 40 obtains a difference D between the sampling voltage value of the discrete point and a standard voltage value of a corresponding matching point through calculation, and then determines whether the difference D is within a reasonable range, if so, the detection result is output that the power supply state of the power supply 810 is normal, and if not, the detection result is output that the power supply state of the power supply 810 is abnormal, and a power switch switching flow of the power switching device needs to be started. It can be seen that, by acquiring the real-time property and the continuity of the sampled voltage value of the output voltage wave of the power supply 810 by the acquisition module 40, the calculation module 40 can obtain the detection result of whether the power supply state of the power supply 810 is abnormal in real time or continuously, thereby ensuring the real-time property or the continuity of the actual detection of the power state detection system 100.
It is understood that the reasonable range value may be set manually according to the model or type of the power supply 810, or the reasonable range value may be preset by the user for different types or models of the power supply 810.
In practical applications, data acquisition may be interfered by the outside or the inside, so that data of some sampling voltage values acquired by the acquisition module 20 is interfered, and further, an error occurs in a detection result of the power state detection system 100. Therefore, the accuracy and reliability of the detection result of the power state detection system 100 are improved.
Further, the power state detection system 100 further includes an anti-interference processing module 60, and the sampling module 20 increases the sampling number of the discrete points for acquiring the output voltage wave, wherein the anti-interference module 60 performs anti-interference processing on the sampling voltage converted by the phase conversion circuit 11 of the conversion circuit 10 by using a digital filtering manner. That is to say, the real-time input voltage of the power supply 810 is converted by the phase conversion circuit 11, further processed by the anti-interference processing module 60, and then input to the operational amplifier circuit 13 for operational amplification, and then converted into the output voltage wave. Therefore, the sampling voltage value of the output voltage wave acquired by the acquisition module 20 is more accurate.
Further, the calculating module 40 obtains the detection result by continuously comparing a set of the sampling voltage values with a corresponding standard voltage value. That is, the calculating module 40 obtains a plurality of calculation results by calculating whether the difference between the sampling voltage values of a plurality of discrete points and the standard voltage values of the corresponding matching voltages is within the reasonable range, and the calculating module 40 obtains the detection result according to the calculation results. That is, the calculation module 40 comprehensively determines whether the power supply state of the power supply 810 is abnormal or not by detecting and comparing data of a plurality of points, thereby improving the reliability of the detection result of the power supply state detection system 100.
Preferably, the calculation module 40 obtains the detection result based on comparison between the sampled voltage values of 8 consecutive discrete points and the standard voltage values of the corresponding matching points. In other words, the calculation module 40 obtains a first calculation result based on the first sampled voltage value of the first discrete point and the first standard voltage value of the first matching point, and obtains a second calculation result based on the second sampled voltage value of the second discrete point and the second standard voltage value of the second matching point. The calculation module 40 obtains the detection result based on the first calculation result, the second calculation result,. and the eighth calculation result.
In the power state detection method, wherein in the step of obtaining a detection result based on the sampled voltage value and the standard voltage value, the step of obtaining a detection result comprises:
obtaining a first calculation result based on whether the difference value of a first sampling voltage value and a first standard voltage value is in a reasonable range; and
obtaining the detection result based on the first calculation result.
Wherein, in the step of obtaining a detection result based on the sampling voltage value and the standard voltage value, the method further comprises:
obtaining a second calculation result based on whether the difference value of a second sampling voltage value and a second standard voltage value is in a reasonable range; and
wherein in the step of obtaining the detection result based on the first calculation result, it includes:
obtaining the detection result based on the first calculation result and the second calculation result.
Wherein before the obtaining of the sampled voltage value of at least one discrete point of the output power wave of the power supply, the method further comprises:
the real-time input voltage of the power supply 810 is digitally filtered.
For example, the calculation module 40 may determine to obtain the detection result according to a relative number of normal results and abnormal results in the first calculation result, the second calculation result,. and the eighth calculation result. For example, if the number of the normal results is greater than or equal to a reasonable value, the detection result obtained by the calculation module 40 is that the power supply state of the power supply 810 is normal, otherwise, the detection result is that the power supply state of the power supply 810 is abnormal, where the reasonable value may be preset to any one of 1, 2, 3, 4, 5, 6, 7, or 8, or the reasonable value may also be implemented as a ratio, which is not limited herein.
As shown in fig. 5, it is worth mentioning that the acquiring module 20 acquires the sampled voltage values of 64 discrete points sequentially within one cycle of the output voltage wave, wherein the calculating module 40 obtains the detection result based on the sampled voltage values of 8 consecutive discrete points and the corresponding standard voltage values of the matching points. That is to say, the collecting module 20 only needs to collect the sampling voltage values of the discrete points of the output voltage waves of 8 power supplies in sequence, and the calculating module 40 can obtain the detection result once, thereby completing the detection of the power supply state of the power supply 810 once.
It can be seen that, in order to ensure that the sampled voltage values at each of the discrete points within one cycle of the output voltage wave are valid, the total time T for the acquisition module 20 to acquire 64 of the discrete points within one cycle is preset to 20ms, every time interval T0, where T0 is equal to T divided by N to 0.3125ms, and the acquisition time window for the acquisition module 20 to sequentially acquire the sampled voltage values at the discrete points of the output voltage wave of 8 of the power supply is 8T0, i.e., 2.5 ms. That is to say, the power state detection system 100 can complete the detection of the power supply state of the power supply 810 only by collecting a set of the adopted voltage values in the collection time window of 2.5ms, and further considers the reliability of the detection result and the rapidity of the detection time.
It should be understood by those skilled in the art that the acquisition module 20 may acquire other numbers of the sampled voltage values for the calculation module 40 to obtain the detection result. In other words, according to the number of the sampling voltage values collected by the collection module 20, the collection time window for the power status detection system 100 to collect data can be freely adjusted, so as to change the detection time. That is, the preset time of the acquisition time window can be adjusted to less than 5 ms. For example, when the number of the sampled voltage values acquired by the acquisition module 20 is 12, the time length of the acquisition time window is 3.75ms, and so on, which is not limited herein. Therefore, compare in traditional power state detecting system, power state detecting system 100 can be based on gather in the acquisition time window that is less than 5ms the sampling voltage value of a set of discrete point of power supply detects out in the circuit whether power supply's state is unusual, and then more quick.
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (10)
1. A power state detection system for a power switching device, comprising:
a transition circuit:
an acquisition module:
a reference module; and
the conversion circuit converts real-time input voltage of a power supply into an output voltage wave consistent with the phase and frequency of a standard voltage wave of a standard power supply, the acquisition module acquires a sampling voltage value of at least one discrete point of the output voltage wave of the power supply, the reference module acquires a standard voltage value of at least one matching point of the standard voltage wave of the standard power supply, the matching points are in one-to-one correspondence with the discrete points, and the calculation module acquires a detection result based on the sampling voltage value and the standard voltage value.
2. The power state detection system for a power switching device of claim 1, wherein the transition circuit comprises a phase conversion circuit, a zero crossing detection circuit and an operational amplifier circuit, wherein the phase conversion circuit converts the real-time input voltage of the power supply into a converted voltage, wherein the converted voltage is equal in phase magnitude to the standard voltage wave, wherein the zero crossing detection circuit detects a zero crossing of the real-time input voltage based on the converted voltage and the zero crossing, and wherein the operational amplifier circuit outputs the output voltage wave.
3. The power supply status detecting system according to claim 2, wherein the collecting module includes a sampling module for sampling at a preset time from a cycle of the output voltage wave, the collecting module collects a sampled voltage value at a discrete point at intervals within a preset collecting time window, and the reference module includes a sampling module for sampling at a preset time from a cycle of the reference voltage wave, and the reference module collects a reference voltage value at a matching point at the same interval within the same collecting time window.
4. The power state detection system according to any one of claims 1 to 3, wherein the conversion circuit comprises a voltage transformer, a filter capacitor, an input matching resistor, an op amp, and a single power supply, wherein the voltage transformer is connected in series with the input matching resistor to form a first circuit, wherein the filter capacitor is connected in series with the single power supply to form a second circuit, wherein the second circuit is connected in parallel with the input matching resistor, and wherein the first circuit and the second circuit are connected in series with the op amp.
5. The power state detection system for a power switching device of claim 3, wherein the collection module collects 8 of the sampled voltage values.
6. The power state detection system for a power switching device of claim 3, wherein the preset acquisition time window is less than 5 ms.
7. The power state detection system for a power switching device of claim 1, further comprising an anti-jamming processing module, wherein said anti-jamming processing module is configured to digitally filter said real-time input voltage of said power supply.
8. The power state detection system of claim 4, further comprising an anti-jamming processing module, wherein the anti-jamming processing module is configured to digitally filter the real-time input voltage of the power supply.
9. The system according to claim 1, further comprising a reference database, wherein the standard voltage wave of the standard power source is stored in the reference database after being pre-recorded.
10. The system according to claim 8, further comprising a reference database, wherein the standard voltage wave of the standard power source is stored in the reference database after being pre-recorded.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109752670A (en) * | 2019-02-26 | 2019-05-14 | 美登思电气（上海）有限公司 | Power state detection system and its detection method for power transfer device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109752670A (en) * | 2019-02-26 | 2019-05-14 | 美登思电气（上海）有限公司 | Power state detection system and its detection method for power transfer device |
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