CN114280386A - Three-phase power-down phase-loss detection circuit and method and control cabinet - Google Patents
Three-phase power-down phase-loss detection circuit and method and control cabinet Download PDFInfo
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Abstract
The invention discloses a three-phase power-down phase-loss detection circuit, a method and a control cabinet, wherein the circuit comprises: the power supply system comprises at least two voltage detection signal generating circuits, wherein each voltage detection signal generating circuit is connected with two-phase power supply access ports in a three-phase power supply access port, and the two-phase power supply access ports connected among the voltage detection signal generating circuits are different; the voltage detection signal generating circuit is used for detecting the voltage of the accessed two-phase power access port and generating a pulse signal when the three-phase power access port has power access; when the three-phase power access port has a fault, at least one of the two voltage detection signal generation circuits stops outputting pulse signals. The invention solves the problem of larger time delay caused by the existence of three-phase line safety regulation capacitors at the time of power failure detection signals and actual power failure.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a three-phase power failure and phase loss detection circuit, a three-phase power failure and phase loss detection method and a control cabinet.
Background
With the progress of the times and the development of science and technology, many high-precision industries use machines to replace manual work, the working precision of the machines is higher, the working efficiency is higher, and the machines are called industrial robots. The industrial robot body is controlled and driven by a controller and a servo module in a control cabinet. Because the robot works in a complex working condition, the condition that a power supply is powered off or is in phase failure sometimes occurs, and if the condition does not timely store precious processing data and timely adopt protective measures, all aspects of equipment and modules of the industrial robot can be possibly damaged. The existing open-phase protection circuit has certain time delay in the aspect of defect detection due to the safety capacitor on the three-phase power line, so that power failure detection is not timely enough.
Disclosure of Invention
The invention mainly aims to provide a three-phase power failure phase loss detection circuit, a three-phase power failure phase loss detection method and a three-phase power failure phase loss detection control cabinet, and aims to solve the problem of large time delay caused by the existence of three-phase line safety capacitors at the time of power failure detection signals and actual power failure.
In order to achieve the above object, the present invention provides a three-phase power-down phase-loss detection circuit, which includes:
a three-phase power access port;
the power supply system comprises at least two voltage detection signal generating circuits, wherein each voltage detection signal generating circuit is connected with two power access ports in three-phase power access ports, and the two power access ports connected between the voltage detection signal generating circuits are different;
the voltage detection signal generating circuit is used for detecting the voltage of the two-phase power access port and generating a pulse signal when the three-phase power access port has power access; when the three-phase power access port has a fault, at least one of the two voltage detection signal generation circuits stops outputting pulse signals.
Optionally, the number of the voltage detection signal generation circuits is three;
the three-way voltage detection signal generation circuit is used for detecting the voltage of the two accessed power access ports and generating a pulse signal when the three-phase power access port has power access;
when the three-phase power access port is powered off, the three voltage detection signal generating circuits stop outputting pulse signals; alternatively, the first and second electrodes may be,
and when any one phase of the three phases of the power access ports is in phase failure, two voltage detection signal generation circuits connected with the power access ports in phase failure in the three voltage detection signal generation circuits stop outputting pulse signals.
Optionally, the three-phase power-down phase-loss detection circuit includes:
the signal processor is respectively connected with the outputs of the three voltage detection signal generating circuits and is used for generating a pulse signal when confirming that the three-phase power supply access port has power supply access when detecting that the three voltage detection signal generating circuits have pulse signal output in a preset period;
when detecting that the three voltage detection signal generation circuits have no pulse signal output in a preset period, confirming that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
and when two of the three voltage detection signal generation circuits are detected to have no pulse signal output in a preset period, determining that a power access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
Optionally, each of the voltage detection signal generating circuits includes a step-down output circuit, a rectification filter circuit, and a signal generating circuit, which are sequentially connected to the three-phase power access port.
Optionally, the step-down output circuit includes: the first step-down output branch circuit is serially connected between the power access port and the rectification filter circuit, and the second step-down output branch circuit is serially connected between the power access port and the rectification filter circuit.
Optionally, the rectifying and filtering circuit includes:
the input end of the first rectifier diode is connected with one phase of the power supply access port through the voltage reduction output circuit, the input end of the second rectifier diode is connected with the other phase of the power supply access port through the voltage reduction output circuit, the first capacitor is connected with the output end of the rectification filter circuit in parallel, and the voltage stabilizing diode and the third resistor are connected in series and arranged at the positive output end of the rectification filter circuit.
Optionally, the signal generating circuit comprises:
the light-emitting diode of the first optical coupler is connected with the output end of the rectifying and filtering circuit, the light-emitting diode triode of the first optical coupler is connected with a first direct current power supply through the pull-up resistor, and the second capacitor is connected with the light-emitting diode of the first optical coupler in parallel.
The invention also provides a control cabinet, which comprises a filter plate, a servo module and the three-phase power-down open-phase detection circuit, wherein the filter plate is serially connected between an alternating current power supply and the servo module, and the input end of the three-phase power-down open-phase detection circuit is connected with the output end of the filter plate.
The invention also provides a three-phase power failure and phase loss detection method, which is applied to the three-phase power failure and phase loss detection circuit, wherein the three-phase power failure and phase loss detection circuit comprises at least two voltage detection signal generation circuits; the three-phase power failure and phase loss detection method comprises the following steps:
acquiring a pulse signal output by the voltage detection signal generating circuit;
and determining whether the power supply has a fault according to the acquired pulse signal.
Optionally, the number of the voltage detection signal generation circuits is three, and the three-phase power-down and phase-loss detection method further includes the following steps:
detecting pulse signals of the three voltage detection signal generating circuits;
and triggering protection action when determining that the three-phase power access port is powered off or in phase failure according to the pulse signals of the three voltage detection signal generating circuits.
Optionally, the step of determining a power failure or a phase loss of the three-phase power access port according to the three pulse signals output by the voltage detection signal generating circuit specifically includes:
when detecting that the three voltage detection signal generating circuits output pulse signals, generating pulse signals when confirming that the three-phase power supply access port has power supply access;
when detecting that the three voltage detection signal generation circuits have no pulse signal output, determining that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
when detecting that two of the three voltage detection signal generation circuits have no pulse signal output, determining that a power supply access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
Optionally, the step of determining a power failure or a phase loss of the three-phase power access port according to the three pulse signals output by the voltage detection signal generating circuit specifically includes:
when detecting that the three voltage detection signal generating circuits output pulse signals within a preset period, generating pulse signals when confirming that the three-phase power supply access port has power supply access;
when detecting that the three voltage detection signal generation circuits have no pulse signal output in a preset period, confirming that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
and when two of the three voltage detection signal generation circuits are detected to have no pulse signal output in a preset period, determining that a power access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
The three-phase power-down phase-lack detection circuit is provided with at least two voltage detection signal generation circuits, wherein the voltage detection signal generation circuits are used for detecting the voltages of two accessed power access ports and generating pulse signals when a power access exists in a three-phase power access port UVW, and each voltage detection signal generation circuit stops outputting the pulse signals when the three-phase power access port is powered down, or two voltage detection signal generation circuits connected with the phase-lack power access port stop outputting the pulse signals when any one phase in the three-phase power access port UVW is in phase-lack state. The voltage detection signal generating circuit of the embodiment can immediately stop pulse output when power failure or phase failure and other power failures occur, can timely respond when power failure occurs, and timely detects power failure and phase failure through the combination of output signals, so that corresponding measures are timely taken for data storage and protection. The detection circuit of the invention can not be interfered by the delay of the safety capacitor, and can avoid the problem that the detection signal has larger delay with the actual power-down moment due to the existence of the safety capacitor on the three-phase line, thereby ensuring that the detection signal can be detected and responded in time when the power-down is carried out, taking measures to save and protect data, and avoiding economic losses such as equipment damage and even harm to personal safety possibly caused by the untimely power-down detection and protection in the aspect of production and manufacturing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a three-phase power-down phase-loss detection circuit according to an embodiment of the present invention;
FIG. 2 is a pulse waveform diagram output by the three-phase power-down phase-loss detection circuit when detecting that the three-phase power access port is normal;
FIG. 3 is a pulse waveform diagram output by the three-phase power-down open-phase detection circuit when detecting a power-down of the three-phase power access port;
FIG. 4 is a pulse waveform diagram outputted when the three-phase power-down open-phase detection circuit detects a phase-U open phase of a phase line of a three-phase power access port;
FIG. 5 is a schematic circuit diagram of a filter plate in a control cabinet according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart of an embodiment of a three-phase power-down phase-loss detection method of the present invention;
FIG. 7 is a schematic flow chart of another embodiment of a three-phase power-down phase-loss detection method according to the present invention;
FIG. 8 is a flowchart illustrating an embodiment of step S400 in FIG. 6;
fig. 9 is a flowchart illustrating an embodiment of step S400 in fig. 6.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides a three-phase power failure and phase loss detection circuit, which has the functions of power failure and phase loss detection, can be applied to robots, and is used for detecting abnormal conditions such as power failure, phase loss and the like in time and taking corresponding measures to protect the robots in time.
Referring to fig. 1, in an embodiment of the present invention, the three-phase power-down phase-loss detection circuit includes:
a three-phase power access port UVW;
at least two voltage detection signal generating circuits (10, 20, 30), wherein each voltage detection signal generating circuit is connected with two power access ports in the three-phase power access ports, and the two power access ports connected between the voltage detection signal generating circuits are different;
the voltage detection signal generating circuit is used for detecting the voltage of the two-phase power access port and generating a pulse signal when the three-phase power access port has power access; when the three-phase power access port has a fault, at least one of the two voltage detection signal generation circuits stops outputting pulse signals.
In this embodiment, the three-phase power access port UVW may access UVW three-phase power voltage. The number of the voltage detection signal generating circuits can be two or three, and when the voltage detection signal generating circuits are set to be two, the two voltage detection signal generating circuits can detect the voltage of the UV two-phase power access port and the voltage of the UW two-phase power access port. Or the two-way voltage detection signal generation circuit detects the voltage of the UV two-phase power access port and the voltage of the VW two-phase power access port. Or the two-way voltage detection signal generation circuit detects the voltage of the UW two-phase power access port and the voltage of the VW two-phase power access port. The two-path voltage detection signal generation circuit detects the voltage of any two-phase power access port of UVW, when a three-phase power access port has power access, a pulse signal is generated, namely the two-path voltage detection signal generation circuit can generate a pulse signal, when the three-phase power access port has a fault, at least one path of voltage detection signal generation circuit in the two-path voltage detection signal generation circuit stops outputting the pulse signal, for example, when the detected power access port has a phase failure, the corresponding path of voltage detection signal generation circuit stops outputting the pulse signal, and when the power access port has a power failure, the two-path voltage detection signal generation circuit stops outputting the pulse signal.
When the voltage detection signal generating circuit is set to be three paths, each path of voltage detection signal generating circuit is connected with any two power access ports in the three-phase power access ports, and the two power access ports connected with the three paths of voltage detection signal generating circuits are different; the three voltage detection signal generating circuits are used for detecting the voltages of the two accessed power access ports and generating pulse signals when the three-phase power access port UVW has power access;
when the three-phase power access port is powered off, the three voltage detection signal generating circuits stop outputting pulse signals; alternatively, the first and second electrodes may be,
and when any one phase of the three phases of the power access ports is in phase failure, two voltage detection signal generation circuits connected with the power access ports in phase failure in the three voltage detection signal generation circuits stop outputting pulse signals.
In order to better explain the concept of the present invention, the embodiment takes the example that the voltage detection signal generation circuit has three paths, and in the three paths of voltage detection signal generation circuits, two phases of each path of voltage detection signal generation circuit are combined two by two to detect so as to judge the phase loss and power failure of the system. One path is used for acquiring the power voltage of the UV two-phase power access port, and is hereinafter referred to as a UV phase voltage detection signal generation circuit 10, one path is used for acquiring the power voltage of the UW two-phase power access port, and is hereinafter referred to as a UW phase voltage detection signal generation circuit 20, and the other path is used for acquiring the power voltage of the VW two-phase power access port, and is hereinafter referred to as a VW phase voltage detection signal generation circuit 30. Specifically, the UV phase voltage detection signal generation circuit 10 is connected to a UV two-phase power access port and can be connected in series to the UV two-phase power access port to form a detection loop (i.e., the detection loop flows from a U-phase power access port and flows from a V-phase power access port, or the detection loop flows from a V-phase power access port and flows from a U-phase power access port). The UW phase voltage detection signal generating circuit 20 is connected to a UW two-phase power access port and can be connected in series to the UW two-phase power access port to form a detection loop (the detection loop flows in from the U-phase power access port and flows out from the W-phase power access port, or the detection loop flows in from the W-phase power access port and flows out from the U-phase power access port). The VW phase voltage detection signal generating circuit 30 is connected to a VW two-phase power access port and can be connected in series to the VW two-phase power access port to form a detection loop (the detection loop flows in from the V-phase power access port and flows out from the W-phase power access port, or flows in from the W-phase power access port and flows out from the V-phase power access port). Therefore, each path of voltage detection signal generation circuit can detect the power supply voltage accessed by the two-phase power supply access port so as to determine whether the three-phase power supply access port UVW is in phase failure or power failure.
Referring to fig. 2, fig. 2 is a pulse waveform diagram output by the three-phase power-down phase-loss detection circuit when detecting that the three-phase power access port is normal, and when the three-phase power access port UVW is normally connected with voltage, alternating currents flow through the UV two-phase power access port, the UW two-phase power access port and the VW two-phase power access port, so that the three-phase power access port UVW can be connected with alternating three-phase power voltage. The UV phase voltage detection signal generation circuit 10, the UW phase voltage detection signal generation circuit 20, and the VW phase voltage detection signal generation circuit 30 can generate pulse signals corresponding to the three-phase power supply voltage, respectively, following the change rule of the alternating three-phase power supply voltage, and the frequency and duty ratio of the pulse signals correspond to the frequency and duty ratio of the current of the three-phase power supply access port UVW.
Referring to fig. 3, fig. 3 is a pulse waveform diagram output by the three-phase power failure and phase loss detection circuit when detecting that the three-phase power access port is powered down, when both UVW of the UVW three-phase power access port is powered down, or any two phases of the UVW three-phase power access port are powered down, because the alternating current on the phase line accessed by the two-phase or three-phase power access port UVW is not changed, the UV phase voltage detection signal generation circuit 10, the UW phase voltage detection signal generation circuit 20, and the VW phase voltage detection signal generation circuit 30 cannot generate a pulse signal, so that the pulse output can be stopped immediately, the level at the pulse stopping time is slowly raised to the pull-up voltage, although the level is still delayed and slowly raised, the pulse is stopped immediately. Therefore, the later-stage circuit can avoid the delay problem caused by level delay rising by judging whether the pulse stops or not, and compared with the existing method of detecting whether the power is down or not by detecting the inversion of the detection signal, the method can realize the real-time judgment of the power failure detection by changing the type of the judgment detection signal.
Referring to fig. 4, fig. 4 is a pulse waveform diagram output by the three-phase power-down phase-loss detection circuit when detecting that the U-phase of the three-phase power access port is phase-lost, and when any one phase of the UVW three-phase power access port is power-down, that is, phase-lost, no current flows through the phase-lost power access port, so that a complete current loop cannot be formed with other two-phase power access ports, and in addition, current continues to flow through the phase-non-lost two-phase power access port, that is, the phase-non-lost two-phase power access port can continue to form a complete current loop. Because the alternating current on the phase line accessed by the phase-lacking power access port does not change any more, the voltage detection signal generating circuit accessed by the phase-lacking power access port in the UV phase voltage detection signal generating circuit 10, the UW phase voltage detection signal generating circuit 20 and the VW phase voltage detection signal generating circuit 30 cannot generate pulse signals, so that the pulse output can be stopped immediately, the level at the pulse stopping time is slowly raised to the pull-up voltage, although the level is still delayed and slowly raised, the pulse is stopped immediately. Therefore, the later-stage circuit can determine which phase is in phase failure by judging which two voltage detection signal generating circuits stop outputting pulse signals. In the present embodiment, the phase-missing U-phase current is taken as an example for explanation, when the phase-missing U-phase current is detected, no alternating current flows through the UW two-phase power access port and the UV two-phase power access port, and therefore, the UV phase voltage detection signal generation circuit 10 and the UW phase voltage detection signal generation circuit 20 cannot generate pulse signals, so that the pulse output can be immediately stopped. Since the current continues to flow through the VW two-phase power access port, the VW phase voltage detection signal generating circuit 30 can generate and output a pulse signal. The post-stage circuit can determine whether the phase line U accessed by the U-phase power supply access port is in a phase failure according to the existence of the pulse signals output by the UV phase voltage detection signal generating circuit 10, the UW phase voltage detection signal generating circuit 20 and the VW phase voltage detection signal generating circuit 30. Under the condition that the power failure detection can be realized on the upper path, two phases of three phases are respectively combined in pairs, and the real-time judgment of phase failure and power failure can be realized simultaneously by combining the signal output of three circuits.
The three-phase power-down phase-lack detection circuit is provided with at least two voltage detection signal generation circuits, wherein the voltage detection signal generation circuits are used for detecting the voltages of two accessed power access ports and generating pulse signals when a power access exists in a three-phase power access port UVW, and each voltage detection signal generation circuit stops outputting the pulse signals when the three-phase power access port is powered down, or two voltage detection signal generation circuits connected with the phase-lack power access port stop outputting the pulse signals when any one phase in the three-phase power access port UVW is in phase-lack state. The voltage detection signal generating circuit of the embodiment can immediately stop pulse output when power failure or phase failure and other power failures occur, can timely respond when power failure occurs, and timely detects power failure and phase failure through the combination of output signals, so that corresponding measures are timely taken for data storage and protection. The detection circuit of the invention can not be interfered by the delay of the safety capacitor, and can avoid the problem that the detection signal has larger delay with the actual power-down moment due to the existence of the safety capacitor on the three-phase line, thereby ensuring that the detection signal can be detected and responded in time when the power-down is carried out, taking measures to save and protect data, and avoiding economic losses such as equipment damage and even harm to personal safety possibly caused by the untimely power-down detection and protection in the aspect of production and manufacturing.
Referring to fig. 1, in an embodiment, the three-phase power-down and phase-loss detection circuit includes:
a signal processor (not shown in the figure) respectively connected to the outputs of the three voltage detection signal generation circuits, wherein the signal processor is configured to generate a pulse signal when confirming that the three-phase power access port UVW has power access when detecting that the three voltage detection signal generation circuits have pulse signal outputs within a preset period;
when detecting that the three voltage detection signal generation circuits have no pulse signal output in a preset period, confirming that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
and when two of the three voltage detection signal generation circuits are detected to have no pulse signal output in a preset period, determining that a power access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
In this embodiment, the signal processor may be implemented by a microprocessor such as a single chip, a DSP, or an FPGA, and the signal processor integrates a hardware circuit structure and a software program, and is capable of monitoring the pulse signals output by the three voltage detection signal generation circuits in real time, and determining whether a phase failure or a power failure occurs according to the presence or absence of the pulse signals output by the three voltage detection signal generation circuits. The signal processor can specifically avoid the delay problem caused by level delay rising by judging whether the pulse stops, namely, the type of the judgment detection signal is changed so as to realize the instant judgment of power failure detection. It can be understood that the frequency (cycle) of the pulse signal output by the three-way voltage detection signal generation circuit is identical to the alternating current frequency (cycle) of the phase lines U/V/W of the UVW three-phase power access port UVW, that is, each phase line U/V/W corresponds to an alternating current waveform of one cycle, and the three-way voltage detection signal generation circuit generates a pulse waveform identical to the frequency (cycle). Based on this, the preset period of the present embodiment may be set to be consistent with the frequency of the current flowing through the phase line U/V/W, and when the frequency of the current flowing through the phase line U/V/W is set to be 50Hz, the frequency of the preset period is also 50Hz, and when the frequency of the preset period is set to be 100Hz, the frequency of the preset period is also 100 Hz. Based on this, if the signal processor detects that the UV phase voltage detection signal generation circuit 10, the UW phase voltage detection signal generation circuit 20, and the VW phase voltage detection signal generation circuit 30 do not output pulse signals within a preset period, it indicates that no current flows through the phase line corresponding to the phase line U/V/W. The embodiment can detect whether the U/V/W three-phase line is in power failure or phase failure within a preset delay period at most, and compared with the method of determining whether the phase is in power failure (power failure) by means of signal inversion, the method is always in low level when the circuit works normally without phase failure, and is always in high level when the circuit is in power failure, and the voltage of the phase line is slowly reduced due to the existence of the capacitor on the three-phase line when the circuit is in power failure, so that the detection has time delay. In an embodiment, the signal processor may control the control cabinet to stop working or send an alarm prompt signal when determining that the three-phase power access port is powered down or open-phase according to the pulse signal output by the three-way voltage detection signal generating circuit.
Referring to fig. 1, in an embodiment, each of the voltage detection signal generation circuits 13 includes a buck output circuit 11, a rectifying and filtering circuit 12, and a signal generation circuit 13, which are sequentially connected to a three-phase power access port UVW.
It should be understood that each of the voltage detection signal generation circuits 13 is provided with the step-down output circuit 11, the rectifying and filtering circuit 12 and the signal generation circuit 13, and the circuit structures are the same, and the specific circuit structures of the step-down output circuit 11, the rectifying and filtering circuit 12 and the signal generation circuit 13 provided in the UV phase voltage detection signal generation circuit 13 are taken as an example for description in this embodiment.
Three voltage detection signal generating circuits 13, each voltage detection signal generating circuit 13 is provided with a step-down output circuit 11, a rectifying and filtering circuit 12 and a signal generating circuit 13, that is, the UV phase voltage detection signal generating circuit 13 is provided with the step-down output circuit 11, the rectifying and filtering circuit 12 and the signal generating circuit 13, the UW phase voltage detection signal generating circuit 13 is provided with the step-down output circuit 11, the rectifying and filtering circuit 12 and the signal generating circuit 13, and the VW phase voltage detection signal generating circuit 13 is provided with the step-down output circuit 11, the rectifying and filtering circuit 12 and the signal generating circuit 13. The voltage reduction output circuit 11 is used for reducing the voltage of a two-phase power access port connected with the voltage detection signal generation circuit 13, and the full-bridge rectification filter circuit 12 is used for rectifying and filtering the alternating current after being reduced by the voltage reduction output circuit 11 to output direct current; the signal generating circuit 13 is configured to generate a corresponding pulse signal according to the direct current output by the rectifying and filtering circuit 12, specifically, perform shaping processing on the direct current to obtain a pulse signal having the same frequency as the alternating current signal. The principle of the circuit for judging the phase loss of the three-phase power supply is as follows: when the power supply voltage that three-phase power access port UVW inserts is normal, step-down output circuit 11 steps down the power supply voltage after, the output is the alternating current signal that has complete cycle after stepping down, after rectifying and filtering circuit 12 carries out rectification and filtering, the output is full-bridge direct current, signal generation circuit 13 follows the change of full-bridge direct current, produces the pulse signal of high (around the crest of corresponding alternating current) low (around the trough of corresponding alternating current) level alternation.
When the three-phase power supply is in phase failure, two power access ports connected with the phase-failure phase line cannot be accessed by alternating current, namely, the voltage and the current accessed by the input end of the voltage-reduction output circuit 11 are both 0, and the rectifying and filtering circuit 12 does not work, so that the signal generating circuit cannot generate pulse signals. The step-down output circuit 11, the rectifying and filtering circuit 12 and the signal generating circuit 13 in the one-way voltage detection signal generating circuit 13 without phase loss can receive the alternating current and generate a pulse signal with high and low levels changing alternately along with the change of the alternating current.
When the three-phase power supply is powered down, three power access ports connected with the phase-lacking phase line are not connected with alternating current, namely, the voltage and the current accessed to the input end of the voltage-reducing output circuit 11 are 0, and the rectifying and filtering circuit 12 does not work, so that the three signal generating circuits can not generate pulse signals.
Referring to fig. 1, it can be understood that each of the voltage detection signal generation circuits is provided with a step-down output circuit, a rectifying and filtering circuit and a signal generation circuit, and the circuit structures are the same, and the specific circuit structures of the step-down output circuit, the rectifying and filtering circuit and the signal generation circuit provided in the UV phase voltage detection signal generation circuit 10 are taken as an example for the description in this embodiment.
The step-down output circuit includes: the first step-down output branch circuit is serially connected between the power access port and the rectification filter circuit, and the second step-down output branch circuit is serially connected between the power access port and the rectification filter circuit.
Further, the first step-down output branch comprises at least two first resistors R11 arranged in series, and two first resistors R11 are arranged in series between one phase of the power access port and the rectifying and filtering circuit; and/or the presence of a gas in the gas,
the second step-down output branch comprises at least two second resistors R21 arranged in series, and the two second resistors R21 are arranged in series between the power access port of the other phase and the rectifying and filtering circuit.
The rectification filter circuit includes:
the input end of the first rectifying diode D11 is connected with one phase of the power access port through the voltage reduction output circuit, the input end of the second rectifying diode D12 is connected with the other phase of the power access port through the voltage reduction output circuit, the first capacitor C11 is arranged in parallel with the output end of the rectifying and filtering circuit, and the stabilizing diode ZD1 and the third resistor R31 are arranged in series at the positive output end of the rectifying and filtering circuit.
The signal generation circuit includes:
first opto-coupler U1, pull-up resistance R41 and second electric capacity C21, the emitting diode of first opto-coupler U1 with the output of rectification filter circuit 11 is connected, the emitting diode triode of the first opto-coupler U1 of first opto-coupler is through pull-up resistance R41 is connected with first direct current power VCC1, second electric capacity C21 with the emitting diode parallel arrangement of the first opto-coupler U1 of first opto-coupler.
In this embodiment, a plurality of first resistors R11 are connected in series to the U-phase power access port, and a plurality of second resistors R21 are connected in series to the V-phase power access port, and step down the connected U-phase ac power and the V-phase power access port, respectively. The diodes D11 and D21 connected in parallel each have two diodes connected in series, respectively, the cathode of the diode connected in series is connected to the anode of the light emitting diode in the optical coupler through the third resistor R31 and the zener diode ZD1, and the anode of the diode connected in series is connected to the cathode of the light emitting diode in the optical coupler. Wherein, the common terminal of a pair of diodes arranged in series is connected with a first resistor R11, the common terminal of the other pair of diodes arranged in series is connected with a second resistor R21, the diodes D11 and D21 connected in parallel realize that the accessed UV two-phase power supply is rectified into direct current, a first capacitor C11 is connected in parallel with the output end of a full-bridge rectification filter circuit, therefore, when the voltage fluctuation of the power grid is large, the spike high voltage can be effectively eliminated, but because of the existence of the first capacitor C11, taking power frequency electricity as an example, the maximum amplitude of bridge rectification output is 540V, the minimum amplitude of actual voltage is 150V, therefore, the fluctuation range of rectified voltage is 150V-540V, when the voltage is higher than 250V, the working current triggers the voltage stabilizing diode ZD1 to normally work, the switch element ZD1 is conducted in the forward direction, the chip of the first optical coupler U1 is conducted, the voltage of the first optical coupler U1 and the common pull-down voltage of the pull-up resistor R41, the output is low. When the voltage is lower than 250V, the working current is not enough to enable the zener diode ZD1 to work normally, the zener diode ZD1 is cut off in the reverse direction, the optical coupler chip U1 is not conducted, and the voltage of the common terminal of the first optical coupler U1 and the pull-up resistor R41 is pulled up by the pull-up resistor R41 to output high level. Therefore, when the UVW phase line voltage accessed to the three-phase power supply access port UVW is normal, the pulse signal with the same frequency as the alternating current and the opposite phase is generated by controlling the on/off frequency of the first optocoupler U1 along with the change of the alternating current.
When the U-phase power supply is in a phase failure and the minimum value of the bridge rectifier output is 150V, the current on the full-bridge rectifier filter circuit in the UV phase and the UW phase is not enough to trigger the voltage stabilizing diode ZD1 to be switched on, namely the voltage stabilizing diode ZD1 is reversely cut off, and the first optical coupler U1 is cut off. The voltage at the common end of the first optical coupler U1 and the pull-up resistor R41 is pulled up by the pull-up resistor R41, and the high-level output is continued without a high-level pulse signal inverted by the signal. And the full-bridge rectification filter circuit in the VW phase follows the change of the alternating current, and generates a pulse signal which has the same frequency as the alternating current and is opposite in phase by controlling the on/off frequency of the first optocoupler U1.
When the UVW phase power supply is in a phase failure and the bridge rectifier outputs the minimum value of 150V, the current on the full-bridge rectifier filter circuit in the UV phase, the UW phase and the VW phase is not enough to trigger the voltage stabilizing diode ZD1 to be conducted, namely the voltage stabilizing diode ZD1 is reversely cut off, and the first optocoupler U1 is cut off. The common end voltage of the first optical coupler U1 and the pull-up resistor R41 is pulled up by the pull-up resistor R41 and is continuously output at a high level, and the optical couplers in the three-phase signal generating circuit cannot be inverted by signals to form a high-level pulse signal.
Similarly, the step-down output circuit 21 in the UW phase voltage detection signal generation circuit 20 includes a first step-down output branch and a second step-down output branch, and the first step-down output branch includes at least two first resistors R21 arranged in series; and/or, the second step-down output branch comprises at least two second resistors R22 arranged in series. The rectifying-and-filtering circuit 22 includes: the first rectifying diode D21, the second rectifying diode D22, the zener diode ZD2, the third resistor R32, and the first capacitor C12, and the signal generating circuit 23 includes: the circuit comprises a first optical coupler U2, a pull-up resistor R42 and a second capacitor C22. The step-down output circuit 31 in the VW phase voltage detection signal generating circuit 30 includes a first step-down output branch, a second step-down output branch, and the first step-down output branch includes at least two first resistors R13 arranged in series; and/or, the second step-down output branch comprises at least two second resistors R23 arranged in series. The rectifying-filtering circuit 32 includes: the first rectifying diode D31, the second rectifying diode D32, the zener diode ZD3, the third resistor R33, and the first capacitor C13, and the signal generating circuit 23 includes: the circuit comprises a first optical coupler U3, a pull-up resistor R43 and a second capacitor C23. The circuit connection relationship and the operation principle between the UW phase voltage detection signal generation circuit 20 and the VW phase voltage detection signal generation circuit 30 may refer to the UV phase voltage detection signal generation circuit 10, and details thereof are omitted here.
The invention further provides a control cabinet which comprises a filter plate, a servo module and the three-phase power-down open-phase detection circuit, wherein the filter plate is arranged between the alternating current power supply and the servo module in series, and the input end of the three-phase power-down open-phase detection circuit is connected with the output end of the filter plate.
The detailed structure of the three-phase power-down open-phase detection circuit can refer to the above embodiments, and is not described herein again; it can be understood that, because the control cabinet of the present invention uses the three-phase power-down phase-loss detection circuit, embodiments of the control cabinet of the present invention include all technical solutions of all embodiments of the three-phase power-down phase-loss detection circuit, and the achieved technical effects are also completely the same, and are not described herein again.
Referring to fig. 5, in the present embodiment, a servo module is provided with a plurality of servo drivers, for example, a four-axis servo driver, a six-axis servo driver, and the like. Be provided with ann rule electric capacity (X electric capacity and Y electric capacity) on the filtering board, still be provided with the inductance, the filtering board sets up in the department of advancing the electricity of switch board for carry out the filtering to the three phase current who inserts. Because the three-phase power supply has the safety X capacitor and the safety Y capacitor in the circuit, the capacitors can cause the potential of the system to slowly drop when the system is powered down, so that a larger time delay exists between the actual power down moment and the moment of detecting a power down signal, wherein the time delay is hundreds of milliseconds in short, and the time delay can reach several seconds or even longer in long. The power of the industrial robot is high, the delay of an actually measured X capacitor is about 100ms when the X capacitor is 0.22uf, the total capacity of the X capacitor can reach 3s when the X capacitor is about 10uf, the delay between actual power failure and power failure delay detection is long, the power failure retention time is relatively short, so that a power failure detection signal needs to be obtained in time to take corresponding measures, and the power failure retention time of some hardware systems is not enough to support power failure related work, so that the power failure can be detected in time, and the method is particularly important. The three-phase power-down phase-loss detection circuit is provided with a three-path voltage detection signal generation circuit and is used for detecting the voltages of two accessed power access ports and generating a pulse signal when a power supply is accessed to the three-phase power access port, and the three-path voltage detection signal generation circuit stops outputting the pulse signal when the three-phase power access port is powered down, or two voltage detection signal generation circuits connected with the power access port with the phase loss in the three-phase power access port stop outputting the pulse signal when any one phase of the three-phase power access port has the phase loss. The three-way voltage detection signal generation circuit of this embodiment all can stop pulse output immediately when falling the power or lack the looks, can not receive the delay interference of ann rule electric capacity, can avoid the detection signal that the existence of ann rule electric capacity on the three-phase line leads to and actually fall the problem that there is great time delay constantly in the power to can in time detect and respond when having guaranteed to fall the power, take the measure to carry out data storage and protection, economic loss such as the equipment damage that has avoided the aspect of manufacturing to fall the power detection and the protection untimely bring is even the harm of personal safety.
The invention also provides a three-phase power failure and phase loss detection method which is applied to the three-phase power failure and phase loss detection circuit, wherein the three-phase power failure and phase loss detection circuit comprises at least two voltage detection signal generation circuits
Referring to fig. 6, the three-phase power-down phase-loss detection method includes the following steps:
step S100, acquiring a pulse signal output by the voltage detection signal generating circuit;
and step S200, determining whether the power supply has a fault according to the acquired pulse signal.
In this embodiment, the three-phase power-down phase-loss detection circuit includes at least two voltage detection signal generation circuits, and is configured to detect voltages of two accessed power access ports, and generate a pulse signal when a power access is provided to a three-phase power access port UVW, where each voltage detection signal generation circuit stops outputting the pulse signal when the three-phase power access port is powered down, or two voltage detection signal generation circuits, connected to the phase-loss power access port, of each voltage detection signal generation circuit stop outputting the pulse signal when any one phase of the three-phase power access port UVW is phase-loss. According to the characteristic that the pulse output can be immediately stopped when the voltage detection signal generating circuit has power failure or phase failure and other power failures, whether the power failure occurs or not can be determined according to the condition of the received pulse signal, and the power failure or phase failure can be responded in time, so that the power failure and the phase failure can be detected in time through the combination of output signals, and corresponding measures can be taken in time for data storage and protection. The detection circuit of the invention can not be interfered by the delay of the safety capacitor, and can avoid the problem that the detection signal has larger delay with the actual power-down moment due to the existence of the safety capacitor on the three-phase line, thereby ensuring that the detection signal can be detected and responded in time when the power-down is carried out, taking measures to save and protect data, and avoiding economic losses such as equipment damage and even harm to personal safety possibly caused by the untimely power-down detection and protection in the aspect of production and manufacturing.
Referring to fig. 7, in an embodiment, the number of the voltage detection signal generation circuits is three, and the three-phase power-down and phase-loss detection method further includes the following steps:
step S300, detecting pulse signals of the three voltage detection signal generating circuits;
and S400, according to the pulse signals of the three voltage detection signal generating circuits, when determining that the three-phase power access port is powered off or in phase failure, triggering a protection action.
The step of triggering the protection action when determining that the three-phase power access port is powered down or open-phase according to the three paths of pulse signals of the voltage detection signal generating circuit specifically comprises:
referring to fig. 8, in step S411, when it is detected that the three voltage detection signal generation circuits output pulse signals, a pulse signal is generated when it is determined that the three-phase power access port has a power access;
step S412, when detecting that the three voltage detection signal generation circuits have no pulse signal output, determining that the three-phase power access port is powered down; and/or the presence of a gas in the gas,
step S413, when detecting that two of the three voltage detection signal generation circuits have no pulse signal output, determining that a power access port simultaneously connected to both of the two voltage detection signal generation circuits is out of phase.
In this embodiment, when the three-phase power access port is normally connected with a voltage, alternating currents flow through the UV two-phase power access port, the UW two-phase power access port, and the VW two-phase power access port, so that the three-phase power access port can be connected with an alternating three-phase power voltage. The UV phase voltage detection signal generation circuit, the UW phase voltage detection signal generation circuit and the VW phase voltage detection signal generation circuit can respectively generate pulse signals corresponding to three-phase power supply voltage along with the change rule of the alternating three-phase power supply voltage, and the frequency and the duty ratio of the pulse signals correspond to the frequency and the duty ratio of the current of the three-phase power supply access port.
When the UVW three-phase power access port is powered off or any two phases of the UVW three-phase power access port are powered off, the alternating current on the phase lines accessed by the two-phase or three-phase power access port is not changed any more, the UV phase voltage detection signal generation circuit, the UW phase voltage detection signal generation circuit and the VW phase voltage detection signal generation circuit cannot generate pulse signals, and therefore pulse output can be stopped immediately. Therefore, the later-stage circuit can avoid the delay problem caused by level delay rising by judging whether the pulse stops or not, and compared with the existing method of detecting whether the power is down or not by detecting the inversion of the detection signal, the method can realize the real-time judgment of the power failure detection by changing the type of the judgment detection signal.
When any phase of the UVW three-phase power access port is powered off, namely, is in phase failure, no current flows through the power access port in the phase failure, so that a complete current loop cannot be formed with other two-phase power access ports, and in addition, current continues to flow through the two-phase power access port in the phase failure, namely, the two-phase power access port in the phase failure can continue to form a complete current loop. Because the alternating current on the phase line accessed by the phase-lacking power access port does not change any more, in the UV phase voltage detection signal generation circuit, the UW phase voltage detection signal generation circuit and the VW phase voltage detection signal generation circuit, the voltage detection signal generation circuit accessed by the phase-lacking power access port cannot generate pulse signals, so that the pulse output can be stopped immediately, the level at the pulse stopping time is slowly raised to the pull-up voltage, and although the level is still delayed and slowly raised, the pulse is stopped immediately. Therefore, the later-stage circuit can determine which phase is in phase failure by judging which two voltage detection signal generating circuits stop outputting pulse signals. In this embodiment, a U-phase current phase loss is taken as an example for explanation, and when a U-phase is in a phase loss state, alternating currents do not flow through the UW two-phase power access port and the UV two-phase power access port, so that the UV phase voltage detection signal generation circuit and the UW phase voltage detection signal generation circuit cannot generate pulse signals, and thus pulse output can be immediately stopped. And current can continuously flow on the VW two-phase power supply access port, so that the VW phase voltage detection signal generation circuit can technically generate and output a pulse signal. The post-stage circuit can confirm whether the phase line U accessed by the U-phase power supply access port is in phase failure according to the existence of pulse signals output by the UV phase voltage detection signal generating circuit, the UW phase voltage detection signal generating circuit and the VW phase voltage detection signal generating circuit. Under the condition that the power failure detection can be realized on the upper path, two phases of three phases are respectively combined in pairs, the real-time judgment of phase failure and power failure can be simultaneously realized by combining the signal output of three circuits, the response is carried out when the power failure is ensured, and the measures are taken for data storage and protection. And when determining that the three-phase power access port is powered off or in phase failure according to the pulse signals output by the three-way voltage detection signal generating circuit, controlling the control cabinet to stop working or sending an alarm prompt signal.
Referring to fig. 9, in an embodiment, when determining that the three-phase power access port is powered down or phase-loss according to the three pulse signals of the voltage detection signal generating circuit, the step of triggering a protection action specifically includes:
step S421, when detecting that the three voltage detection signal generating circuits output pulse signals in a preset period, generating pulse signals when confirming that the three-phase power supply access port has power supply access;
step S422, when detecting that the three voltage detection signal generation circuits have no pulse signal output in a preset period, confirming that the three-phase power access port is powered down; and/or the presence of a gas in the gas,
step S423, when it is detected that two of the three voltage detection signal generation circuits have no pulse signal output within a preset period, determining that the power access ports both connected to the two voltage detection signal generation circuits are out of phase.
It can be understood that the frequency (cycle) of the pulse signal output by the three-way voltage detection signal generation circuit is identical to the alternating current frequency (cycle) of the phase lines U/V/W of the UVW three-phase power access port, that is, each phase line U/V/W corresponds to an alternating current waveform of one cycle, and the three-way voltage detection signal generation circuit generates a pulse waveform identical to the frequency (cycle). Based on this, the preset period of the present embodiment may be set to be consistent with the frequency of the current flowing through the phase line U/V/W, and when the frequency of the current flowing through the phase line U/V/W is set to be 50Hz, the frequency of the preset period is also 50Hz, and when the frequency of the preset period is set to be 100Hz, the frequency of the preset period is also 100 Hz. Based on this, if it is detected that the UV phase voltage detection signal generation circuit, the UW phase voltage detection signal generation circuit, and the VW phase voltage detection signal generation circuit do not output pulse signals within a preset period, it indicates that no current flows through the phase line corresponding to the phase line U/V/W. The embodiment can detect whether the U/V/W three-phase line is in power failure or phase failure within a preset delay period at most, and compared with the method of determining whether the phase is in power failure (power failure) by means of signal inversion, the method is always in low level when the circuit works normally without phase failure, and is always in high level when the circuit is in power failure, and the voltage of the phase line is slowly reduced due to the existence of the capacitor on the three-phase line when the circuit is in power failure, so that the detection has time delay.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. The utility model provides a three-phase falls electric open-phase detection circuitry which characterized in that, three-phase falls electric open-phase detection circuitry includes:
a three-phase power access port;
the power supply system comprises at least two voltage detection signal generating circuits, wherein each voltage detection signal generating circuit is connected with two power access ports in three-phase power access ports, and the two power access ports connected between the voltage detection signal generating circuits are different;
the voltage detection signal generating circuit is used for detecting the voltage of the two-phase power access port and generating a pulse signal when the three-phase power access port has power access;
when the three-phase power access port has a fault, at least one of the two voltage detection signal generation circuits stops outputting pulse signals.
2. The three-phase power-down phase-loss detection circuit of claim 1, wherein the number of the voltage detection signal generation circuits is three;
the three-way voltage detection signal generation circuit is used for detecting the voltage of the two accessed power access ports and generating a pulse signal when the three-phase power access port has power access;
when the three-phase power access port is powered off, the three voltage detection signal generating circuits stop outputting pulse signals; alternatively, the first and second electrodes may be,
and when any one phase of the three phases of the power access ports is in phase failure, two voltage detection signal generation circuits connected with the power access ports in phase failure in the three voltage detection signal generation circuits stop outputting pulse signals.
3. The three-phase power-down phase-loss detection circuit of claim 2, wherein the three-phase power-down phase-loss detection circuit comprises:
the signal processor is respectively connected with the outputs of the three voltage detection signal generating circuits and is used for generating a pulse signal when confirming that the three-phase power supply access port has power supply access when detecting that the three voltage detection signal generating circuits have pulse signal output in a preset period;
when detecting that the three voltage detection signal generation circuits have no pulse signal output in a preset period, confirming that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
and when two of the three voltage detection signal generation circuits are detected to have no pulse signal output in a preset period, determining that a power access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
4. The three-phase power-down phase-loss detection circuit as claimed in claim 1, wherein each of the voltage detection signal generation circuits comprises a voltage-reduction output circuit, a rectification filter circuit and a signal generation circuit, which are sequentially connected to the three-phase power access port.
5. The three-phase power-down phase-loss detection circuit of claim 4, wherein the buck output circuit comprises: the first step-down output branch circuit is serially connected between the power access port and the rectification filter circuit, and the second step-down output branch circuit is serially connected between the power access port and the rectification filter circuit.
6. The three-phase power-down phase-loss detection circuit of claim 4, wherein the rectifying and filtering circuit comprises:
the input end of the first rectifier diode is connected with one phase of the power supply access port through the voltage reduction output circuit, the input end of the second rectifier diode is connected with the other phase of the power supply access port through the voltage reduction output circuit, the first capacitor is connected with the output end of the rectification filter circuit in parallel, and the voltage stabilizing diode and the third resistor are connected in series and arranged at the positive output end of the rectification filter circuit.
7. The three-phase power-down phase-loss detection circuit according to any one of claims 4 to 6, wherein the signal generation circuit comprises:
the light-emitting diode of the first optical coupler is connected with the output end of the rectifying and filtering circuit, the light-emitting diode triode of the first optical coupler is connected with a first direct current power supply through the pull-up resistor, and the second capacitor is connected with the light-emitting diode of the first optical coupler in parallel.
8. A control cabinet, characterized by, include filtering board, servo module and claim 1 to 7 any one the three-phase power down phase loss detection circuit, filtering board series connection set up in alternating current power supply with between the servo module, the three-phase power down phase loss detection circuit's input with filtering board's output is connected.
9. A three-phase power-down phase-loss detection method is applied to the three-phase power-down phase-loss detection circuit as claimed in any one of claims 1 to 7, wherein the three-phase power-down phase-loss detection circuit comprises at least two voltage detection signal generation circuits; the method is characterized by comprising the following steps:
acquiring a pulse signal output by the voltage detection signal generating circuit;
and determining whether the power supply has a fault according to the acquired pulse signal.
10. The method for detecting three-phase power failure and phase loss according to claim 9, wherein the number of the voltage detection signal generation circuits is three, and the method for detecting three-phase power failure and phase loss further comprises the following steps:
detecting pulse signals of the three voltage detection signal generating circuits;
and triggering protection action when determining that the three-phase power access port is powered off or in phase failure according to the pulse signals of the three voltage detection signal generating circuits.
11. The method for detecting power failure and phase loss of a three-phase power supply according to claim 10, wherein the step of triggering a protection action when determining that the three-phase power access port is powered down or phase loss according to the three pulse signals of the voltage detection signal generating circuit specifically includes:
when detecting that the three voltage detection signal generating circuits output pulse signals, generating pulse signals when confirming that the three-phase power supply access port has power supply access;
when detecting that the three voltage detection signal generation circuits have no pulse signal output, determining that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
when detecting that two of the three voltage detection signal generation circuits have no pulse signal output, determining that a power supply access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
12. The method for detecting power failure and phase loss of a three-phase power supply according to claim 10, wherein the step of triggering a protection action when determining that the three-phase power access port is powered down or phase loss according to the three pulse signals of the voltage detection signal generating circuit specifically includes:
when detecting that the three voltage detection signal generating circuits output pulse signals within a preset period, generating pulse signals when confirming that the three-phase power supply access port has power supply access;
when detecting that the three voltage detection signal generation circuits have no pulse signal output in a preset period, confirming that the three-phase power access port is powered down; alternatively, the first and second electrodes may be,
and when two of the three voltage detection signal generation circuits are detected to have no pulse signal output in a preset period, determining that a power access port simultaneously connected with the two voltage detection signal generation circuits is out of phase.
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