CN104360144A - Method for determining zero crossing point of alternating current signal and system for determining zero crossing point of alternating current signal - Google Patents

Method for determining zero crossing point of alternating current signal and system for determining zero crossing point of alternating current signal Download PDF

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CN104360144A
CN104360144A CN201410746237.4A CN201410746237A CN104360144A CN 104360144 A CN104360144 A CN 104360144A CN 201410746237 A CN201410746237 A CN 201410746237A CN 104360144 A CN104360144 A CN 104360144A
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signal
zero
zero crossing
time
moment
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CN201410746237.4A
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Chinese (zh)
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CN104360144B (en
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樊非
车玉明
刘鑫
聂军健
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广东美的环境电器制造有限公司
美的集团股份有限公司
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Abstract

The invention provides a method for determining a zero crossing point of an alternating current signal and a system for determining the zero crossing point of the alternating current signal. The method for determining the zero crossing point of the alternating current signal comprises the following steps: recording lasting time of the output zero crossing point of the alternating current signal, which is detected last time; calculating according to the lasting time and determining reference time of a next-time zero crossing point moment of the alternating current signal; and when a zero crossing signal is detected next time, determining the moment of the next-time zero crossing point moment of the alternating current signal according to the moment of the zero crossing signal detected next time and the reference time. According to the technical scheme, the detection precision of the zero crossing point is effectively improved under the precondition that hardware cost is not increased.

Description

Determine the method and system of AC signal zero crossing point

Technical field

The present invention relates to zero passage detection technical field, determine the method for AC signal zero crossing point and a kind of system determining AC signal zero crossing point in particular to a kind of.

Background technology

In alternating circuit, detect voltage waveform and change through the moment of zero-bit from positive axis to negative semiaxis (or from negative half axial positive axis), be called zero passage detection; At the electric signal that voltage waveform exports through zero-bit, be then referred to as zero cross signal.Zero passage detection is mainly used as the frequency detecting of power supply, also can do synchronizing signal in voltage regulation circuit of chopping.

But the reasons such as the voltage standard difference used due to voltage fluctuation, different regions or the Accuracy of device, zero cross signal also there are differences.Particularly, as when input voltage raises or input divider resistance is less than normal, the zero cross signal duration is longer; Otherwise the duration of over-current signal can be shorter, and then program being caused when processing zero cross signal, occurring that due to the difference of zero cross signal zero crossing judges inaccurate situation.

For the problems referred to above, in correlation technique, mainly propose the accurate detection ensureing zero crossing by software algorithm (namely adopting after postponing a period of time fixed after zero cross signal being detected as zero crossing) and hardware handles two schemes.

But the scheme of zero crossing cannot the change of automatic adapting voltage to adopt constant time lag to judge, needs could determine delay time according to after the test of input voltage difference, and when resistance error is larger, zero crossing can be caused to judge to be forbidden.Although the scheme adopting hardware to improve zero cross signal precision can improve the accuracy judged zero crossing, because needs increase device, add the production cost of product, and reliability and the interference free performance of system can be reduced.

Therefore, how can under the prerequisite not increasing hardware cost, the precision effectively improved the zero crossing of AC signal detects becomes technical matters urgently to be resolved hurrily.

Summary of the invention

The present invention is intended at least to solve one of technical matters existed in prior art or correlation technique.

For this reason, the object of the invention is to propose and a kind ofly under the prerequisite not increasing hardware cost, can effectively improve the method and system of the determination AC signal zero crossing point of zero-crossing examination precision.

For achieving the above object, embodiment according to a first aspect of the present invention, proposes a kind of method determining AC signal zero crossing point, comprising: once detect before record that described AC signal exports the duration of zero cross signal; The reference time for determining a zero crossing moment after described AC signal is calculated according to described duration; When rear one-time detection is to described zero cross signal, the moment of a zero crossing after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time.

Determine the method for AC signal zero crossing point according to an embodiment of the invention, by calculating the reference time for determining a rear zero crossing moment according to the duration of the front zero cross signal once detected, with the moment of a zero crossing after determining AC signal according to rear one-time detection to the moment of zero cross signal and this reference time, make when needing the zero crossing detecting AC signal at every turn, can determine according to the duration before zero cross signal, namely parameter for determining the zero crossing moment can automatically be adjusted according to the situation of change of AC signal, and then ensure that when fluctuation occurs for the voltage of AC signal and frequency, also can the delay time of automatic calibration determination zero crossing, effectively improve the precision being detected zero point, avoid in correlation technique adopt the scheme of fixing delay time determination zero crossing cause cannot automatic adapting voltage and frequency change and cause zero crossing to judge inaccurate problem.Meanwhile, because technical scheme of the present invention is without the need to increasing any hardware, therefore, compared to the scheme adopting hardware to improve zero cross signal precision in correlation technique, the production cost of product is significantly reduced.

In addition, the method for determination AC signal zero crossing point according to the abovementioned embodiments of the present invention, can also have following additional technical characteristic:

According to one embodiment of present invention, calculate the step of described reference time according to the described duration to be specially: using the half the time of described duration as the described reference time.

Determine the method for AC signal zero crossing point according to an embodiment of the invention, due to after zero cross signal being detected, time delay a period of time is just the zero crossing of AC signal, after AC signal zero crossing point, zero cross signal still needs time delay a period of time just to disappear, and the delay time before and after zero crossing is usually identical, therefore can using the half of a front zero cross signal duration as the above-mentioned reference time.Certainly, if the delay time of zero cross signal before and after zero crossing is different, then determine that the method for above-mentioned reference signal also needs suitably to adjust.

According to one embodiment of present invention, after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time, the step in the moment of a zero crossing is specially: rear one-time detection is increased the moment of the moment after the described reference time as a zero crossing after described AC signal to moment of described zero cross signal.

According to one embodiment of present invention, by the duration described in counter records, specifically comprise: by the counts of described zero cross signal once being detected before described counter records; According to count cycle and the described counts calculating described duration of described counter.

Particularly, in the application process of reality, the counter that typically uses chip internal carrys out timing, therefore can the duration to zero cross signal calculates by the counts of counter and count cycle.

According to one embodiment of present invention, the described reference time is calculated according to the described duration, and moment of a zero crossing after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time, specifically comprise: when rear one-time detection is to described zero cross signal, counting is started by described counter, reach a half of described counts in the count value of described counter, determine a zero crossing after described AC signal.

In this embodiment, if above-mentioned counts is odd number, then needs to select counts to be added the value calculating half after 1 according to the situation of side circuit, or counts is subtracted the value calculating half after 1.Particularly, if counts to be added the value calculating half after 1, the zero crossing then determined can move forward, and counts is subtracted the value calculating half after 1, the zero crossing then determined moves after the meeting, therefore need to determine according to the situation of side circuit, with by zero crossing reach or after the impact moved measurement result causes drop to minimum.

Embodiment according to a second aspect of the present invention, also proposed a kind of system determining AC signal zero crossing point, comprising: detecting unit, for detecting the zero cross signal that described AC signal exports; Record cell, for once detecting the duration of described zero cross signal before recording described detecting unit; First computing unit, for calculating the reference time for determining a zero crossing moment after described AC signal according to described duration of described recording unit records; Processing unit, for when after described detecting unit, one-time detection is to described zero cross signal, the moment of a zero crossing after determining described AC signal according to one-time detection after described detecting unit to moment of described zero cross signal and described reference time.

Determine the system of AC signal zero crossing point according to an embodiment of the invention, by calculating the reference time for determining a rear zero crossing moment according to the duration of the front zero cross signal once detected, with the moment of a zero crossing after determining AC signal according to rear one-time detection to the moment of zero cross signal and this reference time, make when needing the zero crossing detecting AC signal at every turn, can determine according to the duration before zero cross signal, namely parameter for determining the zero crossing moment can automatically be adjusted according to the situation of change of AC signal, and then ensure that when fluctuation occurs for the voltage of AC signal and frequency, also can the delay time of automatic calibration determination zero crossing, effectively improve the precision being detected zero point, avoid in correlation technique adopt the scheme of fixing delay time determination zero crossing cause cannot automatic adapting voltage and frequency change and cause zero crossing to judge inaccurate problem.Meanwhile, because technical scheme of the present invention is without the need to increasing any hardware, therefore, compared to the scheme adopting hardware to improve zero cross signal precision in correlation technique, the production cost of product is significantly reduced.

In addition, the system of determination AC signal zero crossing point according to the abovementioned embodiments of the present invention, can also have following additional technical characteristic:

According to one embodiment of present invention, described first computing unit specifically for: using the half the time of described duration as the described reference time.

Determine the system of AC signal zero crossing point according to an embodiment of the invention, due to after zero cross signal being detected, time delay a period of time is just the zero crossing of AC signal, after AC signal zero crossing point, zero cross signal still needs time delay a period of time just to disappear, and the delay time before and after zero crossing is usually identical, therefore can using the half of a front zero cross signal duration as the above-mentioned reference time.Certainly, if the delay time of zero cross signal before and after zero crossing is different, then determine that the method for above-mentioned reference signal also needs suitably to adjust.

According to one embodiment of present invention, described processing unit specifically for: one-time detection after described detecting unit is increased the moment of the moment after the described reference time as a zero crossing after described AC signal to moment of described zero cross signal.

According to one embodiment of present invention, described record cell comprises: counting unit, for the counts by described zero cross signal once being detected before detecting unit described in counter records; Second computing unit, for calculating the described duration according to count cycle of described counter and described counts.

Particularly, in the application process of reality, the counter that typically uses chip internal carrys out timing, therefore can the duration to zero cross signal calculates by the counts of counter and count cycle.

According to one embodiment of present invention, described first computing unit specifically for, calculate a demidegree of described counts; Described processing unit specifically for, when after described detecting unit, one-time detection is to described zero cross signal, start counting by described counter, reach a half of described counts in the count value of described counter, determine a zero crossing after described AC signal.

In this embodiment, if above-mentioned counts is odd number, then needs to select counts to be added the value calculating half after 1 according to the situation of side circuit, or counts is subtracted the value calculating half after 1.Particularly, if counts to be added the value calculating half after 1, the zero crossing then determined can move forward, and counts is subtracted the value calculating half after 1, the zero crossing then determined moves after the meeting, therefore need to determine according to the situation of side circuit, with by zero crossing reach or after the impact moved measurement result causes drop to minimum.

Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:

Fig. 1 shows the schematic flow diagram of the method determining AC signal zero crossing point according to an embodiment of the invention;

Fig. 2 shows the schematic block diagram of the system determining AC signal zero crossing point according to an embodiment of the invention;

Fig. 3 shows the structural representation of zero cross detection circuit according to an embodiment of the invention;

Fig. 4 shows the structural representation of zero cross detection circuit according to another embodiment of the invention;

Fig. 5 shows the schematic flow diagram crossing the method that zero propagation calculates according to an embodiment of the invention;

Fig. 6 shows the schematic flow diagram of the method for zero passage detection according to an embodiment of the invention.

Embodiment

In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.

Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.

Fig. 1 shows the schematic flow diagram of the method determining AC signal zero crossing point according to an embodiment of the invention.

As shown in Figure 1, determine the method for AC signal zero crossing point according to an embodiment of the invention, comprising: step 102, before record, once detect that described AC signal exports the duration of zero cross signal; Step 104, calculates the reference time for determining a zero crossing moment after described AC signal according to described duration; Step 106, when rear one-time detection is to described zero cross signal, the moment of a zero crossing after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time.

By calculating the reference time for determining a rear zero crossing moment according to the duration of the front zero cross signal once detected, with the moment of a zero crossing after determining AC signal according to rear one-time detection to the moment of zero cross signal and this reference time, make when needing the zero crossing detecting AC signal at every turn, can determine according to the duration before zero cross signal, namely parameter for determining the zero crossing moment can automatically be adjusted according to the situation of change of AC signal, and then ensure that when fluctuation occurs for the voltage of AC signal and frequency, also can the delay time of automatic calibration determination zero crossing, effectively improve the precision being detected zero point, avoid in correlation technique adopt the scheme of fixing delay time determination zero crossing cause cannot automatic adapting voltage and frequency change and cause zero crossing to judge inaccurate problem.Meanwhile, because technical scheme of the present invention is without the need to increasing any hardware, therefore, compared to the scheme adopting hardware to improve zero cross signal precision in correlation technique, the production cost of product is significantly reduced.

In addition, the method for determination AC signal zero crossing point according to the abovementioned embodiments of the present invention, can also have following additional technical characteristic:

According to one embodiment of present invention, calculate the step of described reference time according to the described duration to be specially: using the half the time of described duration as the described reference time.

Due to after zero cross signal being detected, time delay a period of time is just the zero crossing of AC signal, after AC signal zero crossing point, zero cross signal still needs time delay a period of time just to disappear, and the delay time before and after zero crossing is usually identical, therefore can using the half of a front zero cross signal duration as the above-mentioned reference time.Certainly, if the delay time of zero cross signal before and after zero crossing is different, then determine that the method for above-mentioned reference signal also needs suitably to adjust.

According to one embodiment of present invention, after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time, the step in the moment of a zero crossing is specially: rear one-time detection is increased the moment of the moment after the described reference time as a zero crossing after described AC signal to moment of described zero cross signal.

According to one embodiment of present invention, by the duration described in counter records, specifically comprise: by the counts of described zero cross signal once being detected before described counter records; According to count cycle and the described counts calculating described duration of described counter.

Particularly, in the application process of reality, the counter that typically uses chip internal carrys out timing, therefore can the duration to zero cross signal calculates by the counts of counter and count cycle.

According to one embodiment of present invention, the described reference time is calculated according to the described duration, and moment of a zero crossing after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time, specifically comprise: when rear one-time detection is to described zero cross signal, counting is started by described counter, reach a half of described counts in the count value of described counter, determine a zero crossing after described AC signal.

In this embodiment, if above-mentioned counts is odd number, then needs to select counts to be added the value calculating half after 1 according to the situation of side circuit, or counts is subtracted the value calculating half after 1.Particularly, if counts to be added the value calculating half after 1, the zero crossing then determined can move forward, and counts is subtracted the value calculating half after 1, the zero crossing then determined moves after the meeting, therefore need to determine according to the situation of side circuit, with by zero crossing reach or after the impact moved measurement result causes drop to minimum.

Fig. 2 shows the schematic block diagram of the system determining AC signal zero crossing point according to an embodiment of the invention.

As shown in Figure 2, determine the system 200 of AC signal zero crossing point according to an embodiment of the invention, comprising: detecting unit 202, for detecting the zero cross signal that described AC signal exports; Record cell 204, for once detecting the duration of described zero cross signal before recording described detecting unit 202; First computing unit 206, the described duration for recording according to described record cell 204 calculates the reference time for determining a zero crossing moment after described AC signal; Processing unit 208, during for one-time detection after the described detecting unit 202 to described zero cross signal, the moment of a zero crossing after one-time detection determines described AC signal to moment of described zero cross signal and described reference time afterwards according to described detecting unit 202.

By calculating the reference time for determining a rear zero crossing moment according to the duration of the front zero cross signal once detected, with the moment of a zero crossing after determining AC signal according to rear one-time detection to the moment of zero cross signal and this reference time, make when needing the zero crossing detecting AC signal at every turn, can determine according to the duration before zero cross signal, namely parameter for determining the zero crossing moment can automatically be adjusted according to the situation of change of AC signal, and then ensure that when fluctuation occurs for the voltage of AC signal and frequency, also can the delay time of automatic calibration determination zero crossing, effectively improve the precision being detected zero point, avoid in correlation technique adopt the scheme of fixing delay time determination zero crossing cause cannot automatic adapting voltage and frequency change and cause zero crossing to judge inaccurate problem.Meanwhile, because technical scheme of the present invention is without the need to increasing any hardware, therefore, compared to the scheme adopting hardware to improve zero cross signal precision in correlation technique, the production cost of product is significantly reduced.

In addition, the system 200 of determination AC signal zero crossing point according to the abovementioned embodiments of the present invention, can also have following additional technical characteristic:

According to one embodiment of present invention, described first computing unit 206 specifically for: using the half the time of described duration as the described reference time.

Due to after zero cross signal being detected, time delay a period of time is just the zero crossing of AC signal, after AC signal zero crossing point, zero cross signal still needs time delay a period of time just to disappear, and the delay time before and after zero crossing is usually identical, therefore can using the half of a front zero cross signal duration as the above-mentioned reference time.Certainly, if the delay time of zero cross signal before and after zero crossing is different, then determine that the method for above-mentioned reference signal also needs suitably to adjust.

According to one embodiment of present invention, described processing unit 208 specifically for: using the moment of the moment after one-time detection after described detecting unit 202 to the increase described reference time in moment of described zero cross signal as a zero crossing after described AC signal.

According to one embodiment of present invention, described record cell 204 comprises: counting unit 2042, for the counts by described zero cross signal once being detected before detecting unit described in counter records 202; Second computing unit 2044, for calculating the described duration according to count cycle of described counter and described counts.

Particularly, in the application process of reality, the counter that typically uses chip internal carrys out timing, therefore can the duration to zero cross signal calculates by the counts of counter and count cycle.

According to one embodiment of present invention, described first computing unit 206 specifically for, calculate a demidegree of described counts; Described processing unit 208 specifically for, when after described detecting unit 202, one-time detection is to described zero cross signal, start counting by described counter, reach a half of described counts in the count value of described counter, determine a zero crossing after described AC signal.

In this embodiment, if above-mentioned counts is odd number, then needs to select counts to be added the value calculating half after 1 according to the situation of side circuit, or counts is subtracted the value calculating half after 1.Particularly, if counts to be added the value calculating half after 1, the zero crossing then determined can move forward, and counts is subtracted the value calculating half after 1, the zero crossing then determined moves after the meeting, therefore need to determine according to the situation of side circuit, with by zero crossing reach or after the impact moved measurement result causes drop to minimum.

The scheme of the determination AC signal zero crossing point that the present invention proposes realizes on the basis of zero cross detection circuit, and wherein zero cross detection circuit can as shown in Figure 3, be made up of triode; Also can as shown in Figure 4, be made up of optocoupler and commutation diode.

Technical scheme of the present invention was mainly divided into zero propagation calculating section and zero passage detection part.

Cross the process flow diagram of zero propagation calculating section as shown in Figure 5.

As shown in Figure 5, cross the method that zero propagation calculates according to an embodiment of the invention, comprising:

Step 502, preserves previous over-zero counting.

Step 504, judges whether over-zero counting is odd number, if so, then performs step 506; Otherwise, perform step 508.

Step 506, when judging over-zero counting as odd number, calculated zero propagation=(over-zero counting+1)/2.In another embodiment of the present invention, also can cross zero propagation by following formulae discovery, namely cross zero propagation=(over-zero counting-1)/2.

Step 508, when judging over-zero counting as even number, calculated zero propagation=over-zero counting/2.

The process flow diagram of zero passage detection part as shown in Figure 6.

As shown in Figure 6, the method for zero passage detection according to an embodiment of the invention, comprising:

Step 602, has judged whether zero cross signal, if so, then performs step 604; Otherwise, terminate.

Step 604, when being determined with zero cross signal, carries out over-zero counting.

Step 606, judges whether over-zero counting equals the zero propagation excessively obtained in Fig. 5, if so, then performs step 608; Otherwise, return step 604, continue counting.

Step 608, if judge, over-zero counting equaled zero propagation, then zero crossing mark is set to 1, namely determines AC signal zero crossing point.

Particularly, suppose that the duration of a front zero cross signal is 2.5 milliseconds, and the time of program loop is 100 microseconds, then over-zero counting is 25, and the zero propagation excessively calculated is 13.

If 8.5 milliseconds time, zero cross signal detected, now count by counter, namely often cross 100 microseconds, zero cross signal counting adds one, when zero cross signal counting is increased to 13 (arriving 9.8 milliseconds), then thinking to be now zero crossing, being set up crossing zero flag.

If when the time arrives 11.5 milliseconds, zero cross signal disappears, then obtaining new over-zero counting is 30, and it is 15 that program starts to calculate next time zero propagation.

When zero cross signal occurs again, circulation performs above-mentioned steps.

Technical scheme of the present invention when not changing program and hardware, can detect the zero crossing of the alternating current of different voltage and frequency automatically.And when voltage and frequency fluctuation, can automatic calibration time delay after zero-crossing, reduce the error of calculation of zero crossing.

More than be described with reference to the accompanying drawings technical scheme of the present invention, the present invention proposes a kind of scheme of new determination AC signal zero crossing point, under the prerequisite not increasing hardware cost, can effectively improve the accuracy of detection of zero crossing.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. determine a method for AC signal zero crossing point, it is characterized in that, comprising:
Once detect before record that described AC signal exports the duration of zero cross signal;
The reference time for determining a zero crossing moment after described AC signal is calculated according to described duration;
When rear one-time detection is to described zero cross signal, the moment of a zero crossing after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time.
2. the method determining AC signal zero crossing point according to claim 1, is characterized in that, the step calculating the described reference time according to the described duration is specially:
Using the half the time of described duration as the described reference time.
3. the method determining AC signal zero crossing point according to claim 1, is characterized in that, after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time, the step in the moment of a zero crossing is specially:
Rear one-time detection is increased the moment of the moment after the described reference time as a zero crossing after described AC signal to moment of described zero cross signal.
4. the method determining AC signal zero crossing point according to any one of claim 1 to 3, is characterized in that, by the duration described in counter records, specifically comprises:
By the counts of described zero cross signal once being detected before described counter records;
According to count cycle and the described counts calculating described duration of described counter.
5. the method determining AC signal zero crossing point according to claim 4, it is characterized in that, the described reference time is calculated according to the described duration, and moment of a zero crossing after determining described AC signal according to rear one-time detection to moment of described zero cross signal and described reference time, specifically comprise:
When rear one-time detection is to described zero cross signal, starts counting by described counter, reach a half of described counts in the count value of described counter, determine a zero crossing after described AC signal.
6. determine a system for AC signal zero crossing point, it is characterized in that, comprising:
Detecting unit, for detecting the zero cross signal that described AC signal exports;
Record cell, for once detecting the duration of described zero cross signal before recording described detecting unit;
First computing unit, for calculating the reference time for determining a zero crossing moment after described AC signal according to described duration of described recording unit records;
Processing unit, for when after described detecting unit, one-time detection is to described zero cross signal, the moment of a zero crossing after determining described AC signal according to one-time detection after described detecting unit to moment of described zero cross signal and described reference time.
7. the system determining AC signal zero crossing point according to claim 6, is characterized in that, described first computing unit specifically for:
Using the half the time of described duration as the described reference time.
8. the system determining AC signal zero crossing point according to claim 6, is characterized in that, described processing unit specifically for:
One-time detection after described detecting unit is increased the moment of the moment after the described reference time as a zero crossing after described AC signal to moment of described zero cross signal.
9. the system of the determination AC signal zero crossing point according to any one of claim 6 to 8, it is characterized in that, described record cell comprises:
Counting unit, for the counts by described zero cross signal once being detected before detecting unit described in counter records;
Second computing unit, for calculating the described duration according to count cycle of described counter and described counts.
10. the system determining AC signal zero crossing point according to claim 9, is characterized in that, described first computing unit specifically for, calculate a demidegree of described counts;
Described processing unit specifically for, when after described detecting unit, one-time detection is to described zero cross signal, start counting by described counter, reach a half of described counts in the count value of described counter, determine a zero crossing after described AC signal.
CN201410746237.4A 2014-12-08 2014-12-08 Determine the method and system of AC signal zero crossing point CN104360144B (en)

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CN105259409A (en) * 2015-10-13 2016-01-20 安徽节源环保科技有限公司 Power signal frequency calculating method based on zero-crossing time-domain characteristic
CN105259409B (en) * 2015-10-13 2017-11-28 安徽节源环保科技有限公司 A kind of frequency power signal computational methods based on zero passage time domain specification
CN107367633A (en) * 2016-05-11 2017-11-21 佛山市顺德区美的电热电器制造有限公司 Zero-cross processing method, device and equipment for voltage zero-crossing detection circuit
CN107367633B (en) * 2016-05-11 2019-08-27 佛山市顺德区美的电热电器制造有限公司 Zero-cross processing method, device and equipment for voltage zero-crossing detection circuit
CN106383264A (en) * 2016-06-08 2017-02-08 江苏现代电力科技股份有限公司 Anti-interference high-precision zero-crossing detection method
CN106383264B (en) * 2016-06-08 2019-06-14 江苏现代电力科技股份有限公司 Anti-interference high-precision zero passage detection method
CN106054712A (en) * 2016-06-20 2016-10-26 福州台江区超人电子有限公司 Intelligent control system for electric appliance in community service
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CN106094620A (en) * 2016-06-20 2016-11-09 福州台江区超人电子有限公司 Remote analog amount gathers warning system
CN106102225A (en) * 2016-06-20 2016-11-09 福州台江区超人电子有限公司 Bridge guardrail pipe control system of lamp decoration
CN106125594A (en) * 2016-06-20 2016-11-16 福州台江区超人电子有限公司 Hotel intelligence control system
CN106227078A (en) * 2016-06-20 2016-12-14 福州台江区超人电子有限公司 A kind of Rainstorm Flood discharge record system
CN106061017A (en) * 2016-06-20 2016-10-26 福州台江区超人电子有限公司 Building LED guardrail tube contour lamp decoration system
CN105960060A (en) * 2016-06-20 2016-09-21 福州台江区超人电子有限公司 Control system for LED landscape lamp posts in park
CN105955222A (en) * 2016-06-20 2016-09-21 福州台江区超人电子有限公司 Household remote intelligence control system
CN105848371A (en) * 2016-06-20 2016-08-10 福州台江区超人电子有限公司 Household wiring-free LED decorative lighting controller
CN105960060B (en) * 2016-06-20 2018-05-22 福州准点信息科技有限公司 Park LED landscape lamp column control system
CN105929748B (en) * 2016-06-20 2018-05-22 福州准点信息科技有限公司 Traditional Chinese medicine decocting room intelligence control system
CN105955222B (en) * 2016-06-20 2018-08-14 福州准点信息科技有限公司 Household remote intelligent control system
CN106125594B (en) * 2016-06-20 2018-08-17 福州准点信息科技有限公司 Hotel intelligence control system
CN106054712B (en) * 2016-06-20 2018-08-17 福州准点信息科技有限公司 Electrical device intelligent control system in community service
CN106094620B (en) * 2016-06-20 2018-08-17 福州准点信息科技有限公司 Remote analog amount acquires alarm system
CN106227078B (en) * 2016-06-20 2018-09-11 福州准点信息科技有限公司 A kind of Rainstorm Flood discharge record system
CN106054710A (en) * 2016-06-20 2016-10-26 福州台江区超人电子有限公司 Intelligent control system for eating house
CN106054711B (en) * 2016-06-20 2018-12-04 福州准点信息科技有限公司 Eating and drinking establishment's intelligent control system
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