CN112540219A - Zero-crossing detection circuit and control circuit - Google Patents
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Abstract
The application relates to a zero-crossing detection circuit and a control circuit. Wherein the zero-crossing detection circuit includes: filter circuit, phase place adjustment circuit, voltage follower circuit and voltage comparison circuit specifically do: on the basis of a conventional zero-crossing detection circuit, collected power grid signals are input into an additionally arranged filter circuit, and a phase adjusting circuit is arranged in front of a voltage following circuit, so that the oscillation of the signals at a zero-crossing point when the power grid is severe is suppressed through the filter circuit, and the phase delay is adjusted through the phase adjusting circuit. Therefore, the frequency of the power grid signal can be accurately detected and output to the corresponding controller, so that the accuracy of the subsequent output control signal of the controller is ensured.
Description
Technical Field
The application relates to the technical field of zero-crossing detection, in particular to a zero-crossing detection circuit and a control circuit.
Background
The zero-crossing detection technology is used for accurately detecting and indicating the position of a zero-crossing point of a signal by using a circuit. The crossing point of a sinusoidal signal and a horizontal axis is generally taken as a zero crossing point of the signal, 2 zero crossing points exist in the period of the sinusoidal signal, the signal reaches a positive value from a negative value through a zero point and is called a positive zero crossing, and the corresponding zero crossing time is called a positive zero crossing point; the zero-crossing point of the signal from positive to negative is called negative zero-crossing, and the corresponding zero-crossing time is called negative zero-crossing. Therefore, the zero-crossing detection technique can be classified into one-way zero-crossing detection and two-way zero-crossing detection. The principle of the zero-crossing sampling circuit is that a square wave is obtained through comparison of a power grid and a zero potential.
The existing zero-crossing detection circuit has the problems that when a power grid is severe, the adopted square wave can oscillate back and forth at the zero crossing point, and the output square wave signal has time delay, so that great negative effects are generated on the control of a frequency converter.
Disclosure of Invention
The application provides a zero-crossing detection circuit and a control circuit, which are used for solving the problems that the square wave adopted by the existing zero-crossing detection circuit can oscillate back and forth at the zero crossing point when the power grid is severe, and the output square wave signal has time delay.
The above object of the present application is achieved by the following technical solutions:
in a first aspect, the present application provides a zero-crossing detection circuit, comprising:
the circuit comprises a filter circuit, a phase adjusting circuit, a voltage following circuit and a voltage comparison circuit; wherein,
the first end of the filter circuit is the input end of the zero-crossing detection circuit, and the second end of the filter circuit is connected with the first end of the phase adjustment circuit and is used for acquiring a sampling signal of zero-crossing detection and inhibiting oscillation in the signal;
the second end of the phase adjusting circuit is connected with the first end of the voltage following circuit and is used for adjusting the phase of a signal;
and the second end of the voltage follower circuit is connected with the first end of the voltage comparison circuit, and the second end of the voltage comparison circuit is the output end of the zero-crossing detection circuit and is used for outputting a detection signal to a controller.
Optionally, the zero-crossing detection circuit further includes a voltage clamping circuit;
the voltage clamping circuit is connected between the second end of the filter circuit and the first end of the phase adjusting circuit in series and used for maintaining voltage stability; the first end of the voltage clamping circuit is connected with the second end of the filter circuit, and the second end of the voltage clamping circuit is connected with the first end of the phase adjusting circuit.
Optionally, the filter circuit is a second-order voltage-controlled filter circuit.
Optionally, the filter circuit introduces positive feedback and negative feedback at the same time.
Optionally, the filter circuit includes:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a first comparator; wherein,
the first end of the first resistor is the first end of the filter circuit, and the second end of the first resistor is respectively connected with the first end of the second resistor and the first end of the first capacitor;
a second end of the second resistor is connected with a first end of the second capacitor and a positive phase input end of the first comparator respectively;
the second end of the second capacitor is grounded;
the negative phase input end of the first comparator is respectively connected with the first end of the third resistor and the first end of the fourth resistor;
a second end of the fourth resistor is grounded;
and the second end of the third resistor, the output end of the first comparator and the second end of the first capacitor are connected to serve as the second end of the filter circuit.
Optionally, the phase adjustment circuit is a filter capacitor;
the first end of the filter capacitor is the first end of the phase adjusting circuit, and the second end of the filter capacitor is the second end of the phase adjusting circuit.
Optionally, the voltage follower circuit includes:
a seventh resistor, an eighth resistor and a second comparator; wherein,
a first end of the seventh resistor, a first end of the eighth resistor and a positive phase input end of the second comparator are connected to serve as a first end of the voltage follower circuit;
a second end of the seventh resistor is grounded;
the second end of the eighth resistor is connected with the anode of a voltage source;
and the negative phase input end of the second comparator is connected with the output end and is used as the second end of the voltage follower circuit.
Optionally, the voltage comparison circuit includes:
a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor and a third comparator; wherein,
the positive phase input end of the third comparator is the first end of the voltage comparison circuit, the negative phase input end of the third comparator is respectively connected with the first end of the ninth resistor and the first end of the tenth resistor, and the output end of the third comparator is connected with the first end of the eleventh resistor;
a second end of the ninth resistor is grounded;
the second end of the tenth resistor is connected with the positive electrode of the voltage source;
a second end of the eleventh resistor is a second end of the voltage comparison circuit;
the fourth capacitor is connected with the ninth resistor in parallel.
Optionally, the voltage clamping circuit includes:
the resistor comprises a fifth resistor, a sixth resistor, a first diode and a second diode; wherein,
a first end of the fifth resistor is a first end of the voltage clamping circuit, and a second end of the fifth resistor is respectively connected with a cathode of the first diode, an anode of the second diode and a first end of the sixth resistor and serves as a second end of the voltage clamping circuit;
the anode of the first diode and the second end of the sixth resistor are both grounded;
and the cathode of the second diode is connected with the anode of a voltage source.
In a second aspect, the present application also provides a control circuit, comprising:
a zero-crossing detection circuit as claimed in any one of the first aspect and a controller connected to an output of the zero-crossing detection circuit.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the technical scheme provided by the embodiment of the application provides a zero-crossing detection circuit, on the basis of a conventional zero-crossing detection circuit, collected power grid signals are input into an additionally arranged filter circuit, and a phase adjustment circuit is arranged in front of a voltage follower circuit, so that the oscillation of the signals at zero-crossing points when a power grid is severe is suppressed through the filter circuit, and the phase delay is adjusted through the phase adjustment circuit. Therefore, the frequency of the power grid signal can be accurately detected and output to the corresponding controller, so that the accuracy of the subsequent output control signal of the controller is ensured.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a zero-crossing detection circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a zero-crossing detection circuit according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a zero-crossing detection circuit according to another embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In view of the problems that the collected square wave signals may oscillate back and forth at the zero crossing point and the output square wave signals may have time delay when the zero crossing detection circuit in the related art is in a severe power grid environment, the present application provides a zero crossing detection circuit capable of adapting to a severe power grid environment, wherein oscillation is suppressed by arranging a filter circuit, and phase adjustment is performed through a phase adjustment circuit, so that an accurate detection signal is obtained, that is, the frequency of the power grid signal is accurately detected. The following examples are given for the purpose of illustration.
Examples
Referring to fig. 1, fig. 1 is a schematic structural diagram of a zero-crossing detection circuit according to an embodiment of the present application. As shown in fig. 1, the zero-crossing detection circuit includes at least: the circuit comprises a filter circuit 1, a phase adjusting circuit 3, a voltage follower circuit 4 and a voltage comparison circuit 5; the first end of the filter circuit 1 is an input end of the zero-crossing detection circuit, and the second end of the filter circuit is connected with the first end of the phase adjustment circuit 3 and used for acquiring a sampling signal of the zero-crossing detection and inhibiting oscillation in the signal; the second end of the phase adjusting circuit 3 is connected with the first end of the voltage follower circuit 4 and is used for adjusting the phase of the signal; the second end of the voltage follower circuit 4 is connected with the first end of the voltage comparison circuit 5, and the second end of the voltage comparison circuit 5 is the output end of the zero-crossing detection circuit and is used for outputting a detection signal to the controller.
That is, based on the above scheme, the collected power grid signal passes through the filter circuit 1, the phase adjustment circuit 3, the voltage follower circuit 4 and the voltage comparison circuit 5 in sequence and then is output to the controller, and the controller correspondingly controls the control target of the power grid signal based on the detected frequency of the power grid signal.
The voltage follower circuit 4 and the voltage comparator circuit 5 are conventional circuit structures in the existing zero-crossing detection circuit, the voltage follower circuit 4 is used for ensuring the stability of signals input into the zero-crossing detection circuit, the voltage comparator circuit 5 is used for outputting square wave signals, and on the basis of the conventional zero-crossing detection circuit, collected power grid signals (before the voltage follower circuit 4) are input into the additionally arranged filter circuit 1, and the phase adjusting circuit 3 is arranged before the voltage follower circuit 4, so that the oscillation of the signals at zero-crossing points during the power grid severe time is inhibited through the filter circuit 1, and the phase delay is adjusted through the phase adjusting circuit 3. Therefore, the frequency of the power grid signal can be accurately detected and output to the corresponding controller, so that the accuracy of the subsequent output control signal of the controller is ensured.
The filter circuit 1 may be implemented by a second-order voltage-controlled filter circuit (also referred to as a butterworth filter) or another circuit configuration as long as the corresponding function can be achieved. For example, oscillations at low and high frequencies can be suppressed separately by introducing both positive and negative feedback.
Of course, in order to make the zero-crossing detection circuit more stable, in a specific implementation, referring to fig. 2, the zero-crossing detection circuit may further include a voltage clamp circuit 2, as shown in fig. 2, where the voltage clamp circuit 2 is connected in series between the second end of the filter circuit 1 and the first end of the phase adjustment circuit 3 for maintaining the voltage stable. That is, unlike the zero-crossing detection circuit shown in fig. 1, the second terminal of the filter circuit 1 and the first terminal of the phase adjustment circuit 3 are not directly connected but connected through the voltage clamp circuit 2; the first end of the voltage clamp circuit 2 is connected to the second end of the filter circuit 1, and the second end is connected to the first end of the phase adjusting circuit 3. By providing the voltage clamp circuit 2, a part of the signal can be limited to a predetermined potential while maintaining the shape of the waveform of the signal.
For ease of understanding, the following is further illustrated by a specific example.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another zero-crossing detection circuit according to an embodiment of the present application.
As shown in fig. 3, the zero-cross detection circuit mainly includes: the circuit comprises a filter circuit 1, a voltage clamping circuit 2, a phase adjusting circuit 3, a voltage follower circuit 4 and a voltage comparison circuit 5;
in fig. 3, the filter circuit 1 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2 and a first comparator U1; a first end of the first resistor R1 is a first end of the filter circuit 1, and a second end of the first resistor R2 is connected to a first end of the first capacitor C1; a second end of the second resistor R2 is connected to the first end of the second capacitor C2 and the non-inverting input terminal of the first comparator U1, respectively; the second end of the second capacitor C2 is grounded; the negative phase input end of the first comparator U1 is respectively connected with the first end of the third resistor R3 and the first end of the fourth resistor R4; a second end of the fourth resistor R4 is grounded; a second terminal of the third resistor R3, an output terminal of the first comparator U1, and a second terminal of the first capacitor C1 are connected to serve as a second terminal of the filter circuit 1.
Specifically, this filter circuit 1 introduces both negative feedback and positive feedback, wherein if the signal oscillates, when the signal frequency tends to zero, the reactance of the first capacitor C1 as the feedback capacitor tends to infinity, and thus the positive feedback is very weak at this time; when the signal frequency tends to infinity, the electric potential up(s) at the point p tends to zero because the reactance of the second capacitor C2 tends to zero. It can be seen that, as long as the positive feedback is properly introduced, it is possible to increase the voltage amplification value when the signal frequency f is equal to the cut-off frequency f0, and the self-oscillation caused by the strong positive feedback will not occur.
Assuming that C1 ═ C2 ═ C, the current equation for point M is:
in the formula (1), Ui(s)、UM(s)、Uo(s) and Up(s) potentials at point i, point M, point o and point p in fig. 3, respectively; r is the resistance of the first resistor R1; c is the capacitance value of the first capacitor and the second capacitor; s is a pull transform factor.
The current equation at point P is:
in the formula (2), the symbols have the same meanings as in the formula (1).
By combining the equations (1) and (2), the transfer function is immediately solved as:
in the formula (3), Au(s) isThe ratio of (a) to (b), i.e. the circuit transfer function; a. theup(s) is when the input frequency f is equal to 0,the magnification of (a) is a constant;
in formula (3), only when AupWhen(s) is less than 3, namely the coefficient of the first term of s in the denominator is more than 0, the circuit can stably work without generating self-oscillation.
If s is jw and f0 is 1/2 pi RC, the simplified voltage amplification factor is:
further, the voltage clamp circuit 2 includes: a fifth resistor R5, a sixth resistor R6, a first diode D1, and a second diode D2; a first end of the fifth resistor R5 is a first end of the voltage clamp circuit 2, and a second end of the fifth resistor R5 is respectively connected to a cathode of the first diode D1, an anode of the second diode D2, and a first end of the sixth resistor R6, and serves as a second end of the voltage clamp circuit 2; the anode of the first diode D1 and the second end of the sixth resistor R6 are both grounded; the cathode of the second diode D2 is connected to the anode of the voltage source.
Specifically, in the voltage clamp circuit 2, the potential in the circuit is limited by using the clamping action of the diode, that is, the characteristic that the forward conduction voltage drop of the diode is relatively stable and the numerical value is small (sometimes, it may be approximately zero).
In addition, the phase adjusting circuit 3 is a filter capacitor, i.e., a third capacitor C3; the first terminal of the filter capacitor C3 is the first terminal of the phase adjustment circuit 3, and the second terminal is the second terminal of the phase adjustment circuit 3.
The third capacitor C3 mainly plays a role in adjusting the phase, when the phase of the output signal is not matched with that of the input signal, the value of the third capacitor C3 can be adjusted to change the phase of the output signal, and the phase of the signal can be adjusted by the method for sampling and frequency sampling with high requirements on signal delay.
Further, the voltage follower circuit 4 includes: a seventh resistor R7, an eighth resistor R8 and a second comparator U2; the first end of the seventh resistor R7, the first end of the eighth resistor R8 and the non-inverting input terminal of the second comparator U2 are connected to serve as the first end of the voltage follower circuit; a second end of the seventh resistor R7 is grounded; the second end of the eighth resistor R8 is connected with the anode of the voltage source; the negative phase input terminal of the second comparator U2 is connected to the output terminal as the second terminal of the voltage follower circuit.
Specifically, the voltage follower circuit 4 is directly connected with the phase adjusting circuit 3, so that the anti-interference capability and the loading capability of the circuit are effectively improved. In addition, the voltage of the input signal is also raised through the second comparator U2, and negative values are converted into positive values, so that the subsequent signals can be conveniently identified and read.
Further, the voltage comparison circuit 5 includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4 and a third comparator U3; the positive phase input end of the third comparator U3 is the first end of the voltage comparison circuit 5, the negative phase input end is respectively connected to the first end of the ninth resistor R9 and the first end of the tenth resistor R10, and the output end is connected to the first end of the eleventh resistor R11; a second end of the ninth resistor R9 is grounded; a second end of the tenth resistor R10 is connected to the positive electrode of the voltage source; a second end of the eleventh resistor R11 is a second end of the voltage comparison circuit 5; the fourth capacitor C4 is connected in parallel with the ninth resistor R9.
Specifically, since the voltage of the signal is raised in the voltage follower circuit 4, the signal is also raised in the circuit to maintain consistency, the raised voltage value is used as a comparison value to be input from the negative phase input terminal of the third comparator U3, the signal is input from the positive phase input terminal of the third comparator U3, the signal is output after passing through the third comparator U3, and then the signal is divided by the eleventh resistor R11 and then transmitted to the controller according to the fact that the signal input to the controller cannot exceed the supply voltage of the controller.
Therefore, in the zero-crossing detection circuit, the filter circuit 1 can effectively prevent the back-and-forth oscillation of the zero-crossing point, and the phase adjusting circuit 3 can effectively change the phase of the signal, so that the finally output detection signal has high precision, and after the detection signal is input into a subsequent controller, the subsequent controller can accurately control the object to be controlled.
It should be noted that the circuit structure shown in fig. 3 is only an example, and a person skilled in the art may modify or convert the circuit structure to obtain other circuit structures based on the operation principle and the application of each functional circuit (such as a filter circuit, a voltage follower circuit, a voltage comparator circuit, etc.).
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means 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 application. In this specification, the schematic representations of the terms used above do not necessarily 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.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A zero-crossing detection circuit, comprising:
the circuit comprises a filter circuit, a phase adjusting circuit, a voltage following circuit and a voltage comparison circuit; wherein,
the first end of the filter circuit is the input end of the zero-crossing detection circuit, and the second end of the filter circuit is connected with the first end of the phase adjustment circuit and is used for acquiring a sampling signal of zero-crossing detection and inhibiting oscillation in the signal;
the second end of the phase adjusting circuit is connected with the first end of the voltage following circuit and is used for adjusting the phase of a signal;
and the second end of the voltage follower circuit is connected with the first end of the voltage comparison circuit, and the second end of the voltage comparison circuit is the output end of the zero-crossing detection circuit and is used for outputting a detection signal to a controller.
2. A zero-crossing detection circuit as claimed in claim 1, further comprising a voltage clamp circuit;
the voltage clamping circuit is connected between the second end of the filter circuit and the first end of the phase adjusting circuit in series and used for maintaining voltage stability; the first end of the voltage clamping circuit is connected with the second end of the filter circuit, and the second end of the voltage clamping circuit is connected with the first end of the phase adjusting circuit.
3. A zero-crossing detection circuit as claimed in claim 1 or 2, wherein the filter circuit is a second order voltage controlled filter circuit.
4. A zero-crossing detection circuit as claimed in claim 3, wherein the filter circuit introduces both positive and negative feedback.
5. A zero-crossing detection circuit as claimed in claim 4, wherein the filtering circuit comprises:
the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a first comparator; wherein,
the first end of the first resistor is the first end of the filter circuit, and the second end of the first resistor is respectively connected with the first end of the second resistor and the first end of the first capacitor;
a second end of the second resistor is connected with a first end of the second capacitor and a positive phase input end of the first comparator respectively;
the second end of the second capacitor is grounded;
the negative phase input end of the first comparator is respectively connected with the first end of the third resistor and the first end of the fourth resistor;
a second end of the fourth resistor is grounded;
and the second end of the third resistor, the output end of the first comparator and the second end of the first capacitor are connected to serve as the second end of the filter circuit.
6. A zero-crossing detection circuit as claimed in claim 1 or 2, wherein the phase adjustment circuit is a filter capacitor;
the first end of the filter capacitor is the first end of the phase adjusting circuit, and the second end of the filter capacitor is the second end of the phase adjusting circuit.
7. A zero-crossing detection circuit as claimed in claim 1 or 2, wherein the voltage follower circuit comprises:
a seventh resistor, an eighth resistor and a second comparator; wherein,
a first end of the seventh resistor, a first end of the eighth resistor and a positive phase input end of the second comparator are connected to serve as a first end of the voltage follower circuit;
a second end of the seventh resistor is grounded;
the second end of the eighth resistor is connected with the anode of a voltage source;
and the negative phase input end of the second comparator is connected with the output end and is used as the second end of the voltage follower circuit.
8. A zero-crossing detection circuit as claimed in claim 1 or 2, wherein the voltage comparison circuit comprises:
a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor and a third comparator; wherein,
the positive phase input end of the third comparator is the first end of the voltage comparison circuit, the negative phase input end of the third comparator is respectively connected with the first end of the ninth resistor and the first end of the tenth resistor, and the output end of the third comparator is connected with the first end of the eleventh resistor;
a second end of the ninth resistor is grounded;
the second end of the tenth resistor is connected with the positive electrode of the voltage source;
a second end of the eleventh resistor is a second end of the voltage comparison circuit;
the fourth capacitor is connected with the ninth resistor in parallel.
9. A zero-crossing detection circuit as claimed in claim 2, wherein the voltage clamp circuit comprises:
the resistor comprises a fifth resistor, a sixth resistor, a first diode and a second diode; wherein,
a first end of the fifth resistor is a first end of the voltage clamping circuit, and a second end of the fifth resistor is respectively connected with a cathode of the first diode, an anode of the second diode and a first end of the sixth resistor and serves as a second end of the voltage clamping circuit;
the anode of the first diode and the second end of the sixth resistor are both grounded;
and the cathode of the second diode is connected with the anode of a voltage source.
10. A control circuit, comprising:
a zero-crossing detection circuit as claimed in any one of claims 1 to 9 and a controller connected to an output of the zero-crossing detection circuit.
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CN102707127A (en) * | 2012-05-29 | 2012-10-03 | 长沙奥托自动化技术有限公司 | Simplified type alternating-current zero-crossing detecting and amplitude value sampling unit |
CN202870157U (en) * | 2012-07-30 | 2013-04-10 | 北京英博电气股份有限公司 | Optical signal isolated high-tension and high-precision zero cross detection circuit |
CN103353558A (en) * | 2013-05-31 | 2013-10-16 | 深圳市康必达控制技术有限公司 | Power quality monitoring method |
CN105142260A (en) * | 2014-08-12 | 2015-12-09 | 杭州士兰微电子股份有限公司 | LED driving circuit applicable to silicon controlled rectifier light modulator, and control circuit thereof |
CN204595077U (en) * | 2015-05-06 | 2015-08-26 | 胡爽禄 | A kind of zero cross detection circuit with phase compensation |
CN106405205A (en) * | 2015-07-30 | 2017-02-15 | 钜泉光电科技(上海)股份有限公司 | Zero-crossing detection circuit |
CN205080188U (en) * | 2015-08-27 | 2016-03-09 | 上海象往电气科技有限公司 | Thyristor zero cross detection circuit |
CN204964613U (en) * | 2015-09-06 | 2016-01-13 | 艾德克斯电子(南京)有限公司 | Zero -cross detection circuit |
CN107643442A (en) * | 2016-07-22 | 2018-01-30 | 刘铮 | A kind of new high-precision zero passage detection method |
CN106646157A (en) * | 2016-12-07 | 2017-05-10 | 沈阳工程学院 | Series arc fault detection method for distribution line based on current zero-crossing features |
CN206848855U (en) * | 2017-02-10 | 2018-01-05 | 珠海凌达压缩机有限公司 | Power factor correction circuit structure and electric appliance with same |
CN107807273A (en) * | 2017-11-28 | 2018-03-16 | 韩璐 | A kind of zero-crossing detection circuit |
CN109946506A (en) * | 2019-04-16 | 2019-06-28 | 深圳市闿思科技有限公司 | Zero-crossing detection system |
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