CN113267685A - Phase sequence detection device and method and electrical equipment - Google Patents

Phase sequence detection device and method and electrical equipment Download PDF

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Publication number
CN113267685A
CN113267685A CN202110758258.8A CN202110758258A CN113267685A CN 113267685 A CN113267685 A CN 113267685A CN 202110758258 A CN202110758258 A CN 202110758258A CN 113267685 A CN113267685 A CN 113267685A
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CN
China
Prior art keywords
phase sequence
power supply
phase
module
electrical equipment
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Pending
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CN202110758258.8A
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Chinese (zh)
Inventor
金国华
叶唤涛
黄强
王文灿
马翠明
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202110758258.8A priority Critical patent/CN113267685A/en
Publication of CN113267685A publication Critical patent/CN113267685A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/18—Indicating phase sequence; Indicating synchronism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/16—Measuring asymmetry of polyphase networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies

Abstract

The invention discloses a phase sequence detection device, a phase sequence detection method and electrical equipment, wherein the device comprises: the switching unit is used for connecting a power supply of the electrical equipment with the phase sequence detection unit; the phase sequence detection unit is used for detecting phase sequence parameters of the power supply after the electrical equipment is powered on under the condition that the phase sequence detection unit is connected with the power supply; the control unit is used for determining whether the phase sequence of the power supply is abnormal or not according to the phase sequence parameters; if the phase sequence is abnormal, initiating a reminding message that the phase sequence is abnormal; if the phase sequence is not abnormal, a normal phase sequence instruction is sent out; and the switching unit is also used for disconnecting the power supply from the phase sequence detection unit under the condition of receiving the normal phase sequence instruction. According to the scheme, the fault reminding is carried out when the three-phase alternating current power supply of the electrical equipment is in phase failure or reverse phase, so that the electrical equipment is prevented from being abnormal and low in power consumption when the three-phase alternating current power supply is in phase failure or reverse phase and continues to work.

Description

Phase sequence detection device and method and electrical equipment
Technical Field
The invention belongs to the technical field of power supplies, particularly relates to a phase sequence detection device, a phase sequence detection method and electrical equipment, and particularly relates to a low-power-consumption phase sequence detection circuit, a low-power-consumption phase sequence detection method and electrical equipment (such as a multi-split air conditioner outdoor unit).
Background
Electrical equipment (such as a multi-split outdoor unit) mostly adopts a three-phase alternating current power supply as a power supply input. In the actual engineering installation process, the phenomena of phase loss or phase inversion of a three-phase alternating-current power supply and the like often occur due to the problems of irregular operation and the like. When a three-phase alternating current power supply is in a phase failure or reverse phase, the multi-connected external unit often has abnormal operation. When the phase sequence of the air conditioner is abnormal (such as the phase loss or the reverse phase of a three-phase alternating-current power supply), the phase sequence abnormality can be detected by the phase sequence detection circuit through the main control board of the multi-connected external unit; however, when the phase sequence of the air conditioner is normal, the external unit of the air conditioner can work normally, and then if the phase sequence detection circuit works all the time, the energy consumption is increased.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a phase sequence detection device, a phase sequence detection method and electrical equipment, and aims to solve the problems that the electrical equipment (such as an outdoor unit of a multi-split air conditioner) adopts a three-phase alternating-current power supply for power supply, and the electrical equipment (such as the outdoor unit of the multi-split air conditioner) works abnormally when the three-phase alternating-current power supply is in a phase failure or in a reverse phase; the phase sequence detection circuit can be used for detecting the phase sequence abnormal condition of the phase loss or the reverse phase of the three-phase alternating-current power supply, but when the phase sequence of electrical equipment (such as a multi-split external machine) is normal, if the phase sequence detection circuit works all the time, the energy consumption is increased; the fault reminding function is achieved when the three-phase alternating current power supply of the electrical equipment (such as an outdoor unit of the multi-split air conditioner) is in phase failure or reversed phase, so that the electrical equipment (such as the outdoor unit of the multi-split air conditioner) is prevented from being abnormal due to continuous work when the three-phase alternating current power supply is in phase failure or reversed phase; and when the phase sequence of the electrical equipment (such as a multi-split outdoor unit) is normal, the phase sequence detection circuit is controlled to stop working, so that the effect of reducing power consumption can be achieved.
The invention provides a phase sequence detection device, comprising: the phase sequence detection unit, the switch unit and the control unit; wherein the switching unit is configured to turn on a power supply path between a power supply source of an electrical appliance and the phase sequence detection unit; the phase sequence detection unit is configured to detect a phase sequence parameter of a power supply source of an electrical apparatus after the electrical apparatus is powered on under the condition that a power supply path between the phase sequence detection unit and the power supply source of the electrical apparatus is connected; the control unit is configured to determine whether the phase sequence of the power supply of the electrical equipment is abnormal or not according to the phase sequence parameter; if the phase sequence of the power supply of the electrical equipment is abnormal, initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal; if the phase sequence of the power supply of the electrical equipment is not abnormal, sending a normal phase sequence instruction; the switch unit is further configured to disconnect a power supply path between a power supply of an electrical device and the phase sequence detection unit when the phase sequence normal instruction is received.
In some embodiments, the switching unit, which switches on a power supply path between a power supply of an electrical appliance and the phase sequence detection unit, includes: under the condition that the switch unit is not electrified, a power supply path between a power supply of electrical equipment and the phase sequence detection unit is switched on; the switching unit, under the condition that receives the normal instruction of phase sequence, make the power supply route disconnection between electrical equipment's power supply and the phase sequence detecting element, include: and under the condition of receiving the normal phase sequence instruction, the switch unit is electrified, so that a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is disconnected.
In some embodiments, the phase sequence detecting unit detects a phase sequence parameter of a power supply of the electrical device, and includes: the method comprises the steps of working in a half alternating current period of a power supply of the electrical equipment to detect phase sequence parameters of the power supply of the electrical equipment.
In some embodiments, the power supply of the electrical device comprises: a three-phase AC power supply; the phase sequence parameters comprise: the time difference between two adjacent phase lines of the three-phase alternating-current power supply; the phase sequence detection unit includes: the device comprises a first detection module, a second detection module and a third detection module; the first detection module is arranged between a first phase line and a zero line of the three-phase alternating-current power supply; in the positive half period of the second phase line of the three-phase alternating-current power supply, the second phase line of the three-phase alternating-current power supply passes through the second detection module and the switch unit and then is communicated to the zero line of the three-phase alternating-current power supply; in the positive half period of the third phase line of the three-phase alternating-current power supply, the third phase line of the three-phase alternating-current power supply passes through the third detection module and the switch unit and then is communicated to the zero line of the three-phase alternating-current power supply; the second detection module is arranged between a second phase line and a zero line of the three-phase alternating-current power supply and can output a time difference between the first phase line and the second phase line of the three-phase alternating-current power supply; the third detection module is arranged between a third phase line and a zero line of the three-phase alternating-current power supply and can output a time difference between the first phase line and the second phase line of the three-phase alternating-current power supply.
In some embodiments, the first detection module comprises: the first diode module and the first current limiting module; the first phase line of the three-phase alternating current power supply is connected to the cathode of the first diode module; the anode of the first diode module is connected to a zero line of the three-phase alternating current power supply after passing through the first current limiting module; the second detection module includes: the second diode module, the second current limiting module and the first optical coupling module; the second phase line of the three-phase alternating current power supply is connected to the anode of the second diode module; the cathode of the second diode module is connected to the anode of the diode side of the first optocoupler module after passing through the second current limiting module; the cathode of the diode side of the first optocoupler module is connected to a zero line of the three-phase alternating-current power supply after passing through the switch unit; a collector electrode at the transistor side of the first optocoupler module can output a time difference between a first phase line and a second phase line of the three-phase alternating-current power supply; the third detection module includes: the third diode module, the third current limiting module and the second optical coupling module; the third phase line of the three-phase alternating current power supply is connected to the anode of the third diode module; the cathode of the third diode module is connected to the anode of the diode side of the first optocoupler module after passing through the third current limiting module; a cathode at the diode side of the second optocoupler module is connected to a zero line of the three-phase alternating-current power supply after passing through the switch unit; and a collector electrode at the transistor side of the second optocoupler module can output the time difference between a second phase line and a third phase line of the three-phase alternating-current power supply.
In some embodiments, the second detection module further comprises: a first shunting module; the first shunt module is arranged between the anode and the cathode of the diode side of the first optical coupling module; the third detection module further includes: a second shunting module; and the second shunt module is arranged between the anode and the cathode of the diode side of the second optical coupling module.
In some embodiments, the switching unit includes: the relay module, the switch tube module and the fourth current limiting module; the contact of the relay module includes: a first contact, a second contact, and a third contact; a third contact of the relay module is suspended; the second contact of the relay module is connected to a zero line of the three-phase alternating-current power supply; the first contact of the relay module is respectively connected to the second detection module and the third detection module; in the case of a connection of the second contact of the relay module and the first contact of the relay module, the switching unit itself is not energized; the switching unit is energized by itself when the third contact of the relay module is connected to the first contact of the relay module; the coil of the relay module is connected to the first connecting end of the switch tube module; the second connecting end of the switch tube module is grounded; a first contact of the relay module of the switching tube module is connected to the control unit after passing through the fourth current limiting module and is used for receiving the normal phase sequence instruction; under the condition that the first contact of the relay module of the switch tube module receives the normal instruction of the phase sequence, the second contact of the relay module is disconnected with the first contact of the relay module, and the third contact of the relay module is connected with the first contact of the relay module.
In some embodiments, the determining, by the control unit, whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter includes: determining whether the phase sequence parameter is within a set parameter range; if the phase sequence parameter is within the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is not abnormal; and if the phase sequence parameter is not in the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is abnormal.
In some embodiments, the control unit determines whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter, and further includes: under the condition that the phase sequence of the power supply of the electrical equipment is abnormal and a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is sent out, or under the condition that the phase sequence of the power supply of the electrical equipment is not abnormal, whether the phase sequence parameter is in a set parameter range or not is continuously determined within set time; if the phase sequence parameter is within the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is not abnormal, and if a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is initiated, stopping initiating the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal; and if the phase sequence parameter is not in the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is abnormal, and initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal.
In accordance with another aspect of the present invention, there is provided an electrical apparatus, including: the phase sequence detection device described above.
In another aspect, the invention provides a phase sequence detection method, which is matched with the electrical equipment, and includes: the power supply path between the power supply of the electrical equipment and the phase sequence detection unit is switched on through the switch unit; detecting, by a phase sequence detection unit, a phase sequence parameter of a power supply of an electrical apparatus after the electrical apparatus is powered on under a condition that a power supply path between the phase sequence detection unit itself and the power supply of the electrical apparatus is connected; determining whether the phase sequence of the power supply of the electrical equipment is abnormal or not according to the phase sequence parameter through a control unit; if the phase sequence of the power supply of the electrical equipment is abnormal, initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal; if the phase sequence of the power supply of the electrical equipment is not abnormal, sending a normal phase sequence instruction; and through the switch unit, under the condition of receiving the normal phase sequence instruction, disconnecting a power supply path between a power supply of the electrical equipment and the phase sequence detection unit.
In some embodiments, wherein the switching unit switches on a power supply path between a power supply of the electrical appliance and the phase sequence detection unit includes: under the condition that the switch unit is not electrified, a power supply path between a power supply of electrical equipment and the phase sequence detection unit is switched on; through the switch unit, under the condition that receives the normal instruction of phase sequence, make the power supply route disconnection between electrical equipment's power supply and the phase sequence detecting element, include: and under the condition of receiving the normal phase sequence instruction, the switch unit is electrified, so that a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is disconnected.
In some embodiments, detecting, by a phase sequence detection unit, a phase sequence parameter of a power supply of the electrical device includes: the method comprises the steps of working in a half alternating current period of a power supply of the electrical equipment to detect phase sequence parameters of the power supply of the electrical equipment.
In some embodiments, determining, by the control unit, whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter includes: determining whether the phase sequence parameter is within a set parameter range; if the phase sequence parameter is within the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is not abnormal; and if the phase sequence parameter is not in the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is abnormal.
In some embodiments, determining, by the control unit, whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter further includes: under the condition that the phase sequence of the power supply of the electrical equipment is abnormal and a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is sent out, or under the condition that the phase sequence of the power supply of the electrical equipment is not abnormal, whether the phase sequence parameter is in a set parameter range or not is continuously determined within set time; if the phase sequence parameter is within the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is not abnormal, and if a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is initiated, stopping initiating the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal; and if the phase sequence parameter is not in the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is abnormal, and initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal.
Therefore, according to the scheme of the invention, the phase sequence detection circuit is arranged and works only in a half alternating current period, so that when the three-phase alternating current power supply of the electrical equipment (such as an outdoor unit of a multi-split air conditioner) is in phase loss or reverse phase, after the main control board of the electrical equipment (such as an outdoor unit of the multi-split air conditioner) is electrified, the phase sequence fault is displayed through the phase sequence detection circuit, and therefore, fault reminding can be carried out when the three-phase alternating current power supply of the electrical equipment (such as an outdoor unit of the multi-split air conditioner) is in phase loss or reverse phase, so that the electrical equipment (such as an outdoor unit of the multi-split air conditioner) is prevented from continuously working and being abnormal when the three-phase alternating current power supply is in phase loss or reverse phase; in addition, since the phase sequence detection circuit operates only in a half ac cycle, power consumption can be reduced. In addition, when the phase sequence of the three-phase alternating-current power supply is normal, the phase sequence detection circuit is cut off, so that the power consumption can be further reduced; therefore, when the phase sequence of the electrical equipment (such as a multi-split outdoor unit) is normal, the phase sequence detection circuit is controlled to stop working, and the power consumption can be reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a phase sequence detecting apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of a low power phase sequence detection circuit;
FIG. 3 is a schematic diagram of one embodiment of a low power phase sequence detection circuit;
FIG. 4 is a flowchart illustrating a phase sequence detection method according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating an embodiment of a first process of determining whether the phase sequence of the power supply of the electrical device is abnormal according to the method of the present invention;
fig. 6 is a flowchart illustrating an embodiment of a second process for determining whether the phase sequence of the power supply of the electrical device is abnormal in the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
The main control board of the multi-split outdoor unit is damaged and cannot work due to long-time phase loss or reverse phase of the three-phase alternating-current power supply of the multi-split outdoor unit. In order to reduce the energy consumption of the multi-split air conditioner (such as an air conditioner), a low-power consumption function is often added in the development process of the air conditioner. When the phase sequence of the air conditioner is abnormal (such as a three-phase alternating current power supply is in a phase failure or in a reverse phase), the main control board of the multi-connected external unit needs to display a phase sequence fault code through a nixie tube. Wherein, the nixie tube can be a nixie tube on the main control panel of the outer machine. That is, when the phase sequence of the air conditioner is abnormal (such as the three-phase alternating current power supply is in phase failure or in reverse phase), the main control board of the multi-connected external unit displays the fault code and reports the abnormality. When the phase sequence of the air conditioner is normal, the air conditioner external unit can work normally, but then the phase sequence detection circuit is not needed to work all the time. Therefore, in order to solve the problems of the related art that the phase sequence detection circuit has high power consumption and does not have a low power consumption function, it is necessary to design a circuit that can detect a phase sequence fault and enter a low power consumption mode when the phase sequence is normal.
According to an embodiment of the present invention, there is provided a phase sequence detection apparatus. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The phase sequence detection apparatus may include: the phase sequence detection unit, the switch unit and the control unit. And the switch unit is arranged between a power supply of the electrical equipment and the phase sequence detection unit. And the control unit is respectively connected with the phase sequence detection unit and the switch unit. And a phase sequence detection unit, such as a phase sequence detection circuit. And the switch unit is a switch circuit formed by a direct current relay J1 and a triode Q1. The control unit may be an electrical device such as a main control board CPU of the multi-split air conditioner. Electrical equipment, such as multi-split outdoor units. After the phase sequence detection unit determines that the phase sequence of the power supply is normal, a circuit loop of the phase sequence detection unit is cut off through the switch unit, so that the power supply enters a low power consumption mode, and the power consumption of the control panel is reduced. That is to say, detect electrical equipment after three-phase alternating current power supply is normal, cut off the circuit return circuit of phase sequence detecting element to enter low-power consumption mode, reduce the control panel power consumption.
Wherein the switch unit is configured to be in a state capable of turning on a power supply path between a power supply of an electrical appliance and the phase sequence detection unit, so as to turn on the power supply path between the power supply of the electrical appliance and the phase sequence detection unit, that is, to electrify the phase sequence detection unit.
The phase sequence detection unit is configured to detect a phase sequence parameter of a power supply of an electrical apparatus after the electrical apparatus is powered on under the condition that a power supply path between the phase sequence detection unit itself and the power supply of the electrical apparatus is switched on.
In some embodiments, the phase sequence detecting unit detects a phase sequence parameter of a power supply of the electrical device, and includes: the phase sequence detection unit is specifically configured to operate within a half ac cycle of a power supply of an electrical device to detect a phase sequence parameter of the power supply of the electrical device. For example: the phase sequence detection circuit works only in half of the alternating current period, and power consumption can be reduced.
In some embodiments, the power supply of the electrical device comprises: a three-phase ac power supply. The phase line of the three-phase alternating current power supply comprises: the first phase line is L1, the second phase line is L2, and the third phase line is L3. The phase sequence parameters comprise: and the time difference between two adjacent phase lines of the three-phase alternating current power supply.
The phase sequence detection unit includes: the device comprises a first detection module, a second detection module and a third detection module.
The first detection module is arranged between a first phase line and a zero line of the three-phase alternating-current power supply. In the positive half period of the second phase line of the three-phase alternating-current power supply, the second phase line of the three-phase alternating-current power supply passes through the second detection module and the switch unit and then is communicated to the zero line of the three-phase alternating-current power supply; in the positive half period of the third phase line of the three-phase alternating current power supply, the third phase line of the three-phase alternating current power supply passes through the third detection module and the switch unit and then is communicated to the zero line of the three-phase alternating current power supply. For example: the positive half cycle of a second phase line L2 of the three-phase alternating current power supply flows into a zero line after passing through the diode D2, the resistor R2, the resistor R4 and the input end of the optocoupler U1. The positive half cycle of the third phase line L3 of the three-phase alternating current power supply flows into the zero line after passing through the input ends of the resistor diode D3, the resistor R3, the resistor R5 and the optocoupler U2.
The second detection module is arranged between the second phase line and the zero line of the three-phase alternating-current power supply and can output the time difference between the first phase line and the second phase line of the three-phase alternating-current power supply to the control unit.
The third detection module is arranged between a third phase line and a zero line of the three-phase alternating-current power supply and can output a time difference between the first phase line and the second phase line of the three-phase alternating-current power supply to the control unit.
In some embodiments, the first detection module comprises: the circuit comprises a first diode module and a first current limiting module. A first diode module, such as diode D1. A first current limiting module, such as resistor R1. And the first phase line of the three-phase alternating current power supply is connected to the cathode of the first diode module. And the anode of the first diode module is connected to a zero line of the three-phase alternating current power supply after passing through the first current limiting module.
The second detection module includes: the second diode module, the second current limiting module and the first optical coupling module. A second diode module, such as diode D2. A second current limiting module, such as resistor R2. And a first optical coupler module, such as an optical coupler U1. And the second phase line of the three-phase alternating current power supply is connected to the anode of the second diode module. And the cathode of the second diode module is connected to the anode of the diode side of the first optocoupler module after passing through the second current limiting module. And the cathode at the diode side of the first optocoupler module is connected to a zero line of the three-phase alternating-current power supply after passing through the switch unit. And the collector electrode at the transistor side of the first optocoupler module can output the time difference between a first phase line and a second phase line of the three-phase alternating-current power supply. And a first pull-up module such as a resistor R6 is further arranged between the collector of the first optical coupling module and the DC power supply VCC.
The third detection module includes: the third diode module, the third current limiting module and the second optical coupling module. And a third diode module, such as diode D3. And a third current limiting module, such as resistor R3. And a second optical coupler module, such as an optical coupler U2. And a third phase line of the three-phase alternating current power supply is connected to the anode of the third diode module. And the cathode of the third diode module is connected to the anode of the diode side of the first optocoupler module after passing through the third current limiting module. And the cathode at the diode side of the second optocoupler module is connected to a zero line of the three-phase alternating-current power supply after passing through the switch unit. And a collector electrode at the transistor side of the second optocoupler module can output the time difference between a second phase line and a third phase line of the three-phase alternating-current power supply. And a second pull-up module such as a resistor R7 is further arranged between the collector of the second optical coupling module and the DC power supply VCC.
Fig. 3 is a schematic diagram of an embodiment of a low power phase sequence detection circuit. As shown in fig. 3, a low power phase sequence detection circuit includes: the phase sequence detection circuit comprises a connecting terminal CN1, an optical coupler U1, an optical coupler U2, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7.
In the example shown in fig. 3, when the dc relay J1 is not operating, the contacts 3 and 4 of the dc relay J1 are kept in a normally closed state. When the coil of the dc relay J1 is energized, the contact 5 and the contact 3 of the dc relay J1 are closed.
In the example shown in fig. 3, pins 1, 2, 3, and 4 of a connection terminal CN1 of the phase sequence detection circuit are connected to a neutral line N of a three-phase ac power supply and three-phase live lines L1, L2, and L3, respectively. Pin1 of the connection terminal CN1 is connected to the contact 4 of the dc relay J1, and is also connected to the anode of the diode D1 through the resistor R1. The cathode of diode D1 is connected to pin2 of terminal CN 1. Pin3 of terminal CN1 is connected to the anode of diode D2. The cathode of the diode D2 is connected to the anode of the diode side of the optocoupler U1 (i.e., pin1 of the optocoupler U1) via the resistor R2. Pin 4 of terminal CN1 is connected to the anode of diode D3. The cathode of the diode D3 is connected to the anode of the diode side of the optocoupler U2 (i.e., pin1 of the optocoupler U2) via the resistor R3. Diode D1, diode D2, diode D3, as rectifier diode, mainly play single-phase conduction effect, namely can pass through in the alternating current only half cycle, like this, guarantee to detect L2 and L3 only in the positive half cycle of alternating current, opto-coupler U1 and opto-coupler U2 are nonconducting when the negative half cycle of alternating current, have reduced phase sequence detection circuit's the power consumption that generates heat promptly, therefore this phase sequence detection circuit possesses the low-power consumption and detects the function. The resistor R1, the resistor R2 and the resistor R3 mainly play a role in limiting current and dividing voltage.
In some embodiments, the second detection module further comprises: a first shunting module, such as resistor R4. The first shunt module is arranged between the anode and the cathode of the diode side of the first optical coupling module.
The third detection module further includes: a second shunt module, such as resistor R5. And the second shunt module is arranged between the anode and the cathode of the diode side of the second optical coupling module.
In the example shown in fig. 3, the cathode on the diode side of the optocoupler U1 (i.e., pin2 of the optocoupler U1) is connected to contact 3 of the dc relay J1. And the resistor R4 is connected between the pin1 and the pin2 of the optocoupler U1. The cathode of the diode side of the optocoupler U2 (i.e., pin2 of the optocoupler U2) is connected to contact 3 of the dc relay J1. And the resistor R5 is connected between the pin1 and the pin2 of the optocoupler U2. The resistor R4 and the resistor R5 are connected with the input ends of the optocoupler U1 and the optocoupler U2 in parallel, and are mainly used for shunting and rapidly discharging to adjust the current transmission ratio of the optocoupler U1 and the optocoupler U2.
In the example shown in fig. 3, the transistor-side collector of the optocoupler U1 (i.e., Pin3 of the optocoupler U1) serves as a port CPU _ Pin1, and is further connected to a dc power supply VCC via a resistor R6. The emitter of the transistor side of the optocoupler U1 (i.e., the 4-pin of the optocoupler U1) is grounded. The transistor-side collector of the optocoupler U2 (i.e., Pin3 of the optocoupler U2) serves as a port CPU _ Pin2, and is further connected to a dc power supply VCC via a resistor R76. The emitter of the transistor side of the optocoupler U2 (i.e., the 4-pin of the optocoupler U2) is grounded.
In some embodiments, the switching unit includes: the relay module, the switch tube module and the fourth current limiting module; the contact of the relay module includes: a first contact (e.g., contact 3 of relay J1), a second contact (e.g., contact 4 of relay J1), and a third contact (e.g., contact 5 of relay J1); and the third contact of the relay module is suspended. The relay module has a first contact, a second contact, and the first contact of the relay module. And the second contact of the relay module is connected to a zero line of the three-phase alternating-current power supply. And the first contact of the relay module is respectively connected to the second detection module and the third detection module. In the case of a connection of the second contact of the relay module and the first contact of the relay module, the switching unit itself is not energized. The switching unit is itself energized when the third contact of the relay module and the first contact of the relay module are connected.
And the first end of the coil of the relay module is connected with a direct current power supply. The second end of the coil of the relay module is connected to the first connection end of the switch tube module, such as the collector of a transistor Q1. And a second connection end of the switching tube module is grounded, such as an emitter electrode of a triode Q1. And a first contact of the relay module of the switching tube module, such as a base of a triode Q1, is connected to the control unit after passing through the fourth current limiting module and is used for receiving the normal phase sequence instruction. A fourth current limiting module such as resistor R8. And the resistor R9 is used for protecting the transistor Q1. The resistor R8 is connected in series with the base of the transistor Q1, and the resistor R9 is pulled down to the ground level, so that the base level of the transistor Q1 can be in a stable low level state when the first contact of the relay module of the transistor Q1 has no control signal.
Under the condition that the first contact of the relay module of the switch tube module receives the normal instruction of the phase sequence, the second contact of the relay module is disconnected with the first contact of the relay module, and the third contact of the relay module is connected with the first contact of the relay module.
For example: referring to the example shown in fig. 3, the phase sequence detection circuit further includes: direct current relay J1, triode Q1, resistor R8 and resistor R9. A first end of the coil of the dc relay J1 (i.e., pin1 of the dc relay J1) is connected to a dc power source VCC and also connected to the cathode of the diode D4. The second terminal of the coil of the dc relay J1 (i.e., pin2 of the dc relay J1) is connected to the anode of the diode D4, and is also connected to the collector of the transistor Q1. The emitter of transistor Q1 is connected to ground. The base of the transistor Q1 is grounded through a resistor R9 and is used as a port CPU _ Pin3 through a resistor R8.
The port CPU _ Pin1, the port CPU _ Pin2 and the port CPU _ Pin3 are respectively connected to pins 1, 2 and 3 of the main control board CPU, and are mainly used for detecting signal levels. The port CPU _ Pin1 is connected to the output port of the CPU and normally outputs a low level. The port CPU _ Pin2 and the port CPU _ Pin3 are connected to the input port of the CPU and normally configured in a floating input mode. The resistor R6 and the resistor R7 are pull-up resistors. The diode D4 is a freewheeling diode. The direct current supply voltage provided by the direct current power supply VCC can be selected according to actual conditions.
The control unit is configured to determine whether the phase sequence of the power supply of the electrical equipment is abnormal or not according to the phase sequence parameter. And the number of the first and second groups,
in some embodiments, the determining, by the control unit, whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter includes:
the control unit is specifically further configured to determine whether the phase sequence parameter is within a set parameter range.
The control unit is specifically configured to determine that the phase sequence of the power supply of the electrical equipment is not abnormal if the phase sequence parameter is within the set parameter range.
The control unit is specifically configured to determine that the phase sequence of the power supply of the electrical equipment is abnormal if the phase sequence parameter is not within the set parameter range.
Referring to the example shown in fig. 3, since the phase difference between two adjacent phase lines of the live lines L1, L2, and L3 of the three-phase alternating current is 120 °, the phase loss or the reverse phase can be detected by detecting the time difference between the phase lines. For example: when the conduction time of the end of the optocoupler triode is detected, the time difference of the phase line is obtained. In the related scheme, the power frequency alternating current is 50Hz, and the period is 1/50-20 ms. Since the phase difference between two adjacent phases is 120 °, the time difference between the waveforms of two adjacent phases is 20 × 120/360 — 6.67 ms. That is, L1 leads L2 by 6.67ms, and L2 leads L3 by 6.67 ms. When operating in a 60Hz AC grid, L1 leads L2 by 5.56ms, and L2 leads L3 by 5.56 ms.
When the phase sequence is normal, the negative half cycle of L1 flows into the neutral line through diode D1, resistor R1. The positive half cycle of the L2 flows into a neutral line through a diode D2, a resistor R2, a resistor R4 and the input end of an optical coupler U1. The positive half cycle of the L3 flows into a zero line through a diode D3, a resistor R3, a resistor R5 and the input end of an optical coupler U2. Therefore, the input ends of the optocoupler U1 and the optocoupler U2 are sequentially conducted, and the port CPU _ Pin1 and the port CPU _ Pin2 are sequentially changed from high level to low level. When the power is 50Hz, the main chip detects that the Pin low time of the port CPU _ Pin1 is about 6.67ms before the Pin low time of the port CPU _ Pin2, so that no phase sequence fault is judged.
The main control board takes the voltage of live line L1 and neutral line N. The main control board is not operated when L1 is out of phase. When the live wire L2 or the live wire L3 is out of phase, the corresponding port CPU _ Pin1 or the corresponding port CPU _ Pin2 has no signal output, and a phase sequence protection fault is reported. When the reverse phase condition occurs, the time difference between the port CPU _ Pin1 and the port CPU _ Pin2 is not within the normal range, and thus a phase sequence fault is reported.
In the example shown in fig. 3, since the dc relay J1, the transistor Q1, the resistor R8, the resistor R9, and the diode D4 are provided, the common terminal of the phase sequence detection circuit can be disconnected, and the standby power consumption of the main control board is reduced. Specifically, when the phase sequence needs to be detected, the coil of the direct current relay J1 is attracted, the contact is conducted, and the phase sequence detection circuit works. When the phase sequence detection is finished, the direct current relay J1 is switched off, no current flows through the phase sequence detection circuit, the power consumption can be effectively reduced, and the low-power-consumption phase sequence detection is realized.
In some embodiments, the control unit determines whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter, and further includes:
the control unit is specifically configured to, when the phase sequence of the power supply of the electrical equipment is abnormal, a warning message that the phase sequence of the power supply of the electrical equipment is abnormal has been initiated, or when the phase sequence of the power supply of the electrical equipment is not abnormal, continue to determine whether the phase sequence parameter is within a set parameter range within a set time.
The control unit is specifically configured to determine that the phase sequence of the power supply of the electrical equipment is not abnormal if the phase sequence parameter is within the set parameter range within a set time, and stop initiating the warning message that the phase sequence of the power supply of the electrical equipment is abnormal if the warning message that the phase sequence of the power supply of the electrical equipment is abnormal has been initiated.
The control unit is specifically configured to determine that the phase sequence of the power supply of the electrical equipment is abnormal if the phase sequence parameter is not within the set parameter range within the set time, and initiate a warning message that the phase sequence of the power supply of the electrical equipment is abnormal. Specifically, if a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal has been initiated, the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is continuously initiated. If the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is not initiated, the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is initiated.
Referring to the example shown in fig. 2, a workflow of a low power phase sequence detection circuit further includes: in order to prevent false alarm or failure, the phase sequence detection circuit will continue to detect for t time (t is selected according to practical application). If the phase sequence fault is still detected within the time t, the nixie tube always displays the phase sequence fault. If the phase sequence fault is recovered due to external factors or other factors within the time t, the nixie tube can normally display at the moment, the main control board normally works, and then the phase sequence detection circuit enters a low power consumption mode to stop detection. Therefore, the standby and operation of the unit in the lowest power consumption state are ensured while the phase sequence of the power supply is effectively monitored. That is, when the phase sequence is abnormal, the nixie tube reports the fault; when the phase sequence is normal, for safety, the phase sequence is delayed and then judged, and when the phase sequence is judged to be normal by delaying, the true normal of the phase sequence is determined. Thus, detection is cycled.
By using the low-power phase sequence detection circuit provided by the example shown in fig. 3, if a phase sequence fault is detected all the time within the power-on time t, the nixie tube reports the phase sequence protection fault. When the time for detecting that L2 leads L3 or L1 leads L2 is in the range of 5-8ms (5-8ms is selected according to practical application), the phase sequence time difference is considered to be in the normal range, the chip judges that the phase sequence is normal, otherwise, phase sequence protection is reported.
If the phase sequence is detected to be normal after electrifying for t time, at the moment, the nixie tube can normally display, the Pin3 of the CPU of the connection port CPU _ Pin3 outputs high level, the triode Q1 is conducted, the coil of the direct current relay J1 is electrified, the contact 3 and the contact 5 of the direct current relay J1 are conducted, and the phase sequence detection circuit stops working and enters a low power consumption mode. When the phase sequence is still normal after the time t, the direct current relay J1 cuts off the detection loops of L2 and L3 and enters a low power consumption mode, so that the phase sequence detection circuit has a low power consumption control function.
The disconnection between the contact 3 and the contact 4 of the relay J1 means that the diode end circuits of the optocoupler U1 and the optocoupler U2 in the detection circuit are disconnected, and at this time, the detection loops of the phase lines L2 and L3 are cut off.
The control unit is further configured to initiate a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal if the phase sequence of the power supply of the electrical equipment is abnormal. For example: and displaying the abnormal fault condition of the phase sequence through a digital tube of a main control board of an electrical device such as a multi-split outdoor unit.
Fig. 2 is a schematic diagram of a working flow of an embodiment of a low power consumption phase sequence detection circuit. As shown in fig. 2, a working flow of a low power consumption phase sequence detection circuit includes: after the power supply of the main control board of the multi-split outdoor unit is input, the phase sequence detection circuit starts to work. Then, the CPU of the main control board judges whether a phase sequence fault occurs through the phase sequence detection circuit. When the phase sequence is abnormal (such as phase loss or reverse phase), the nixie tube on the main control board can immediately report the phase sequence fault, namely the nixie tube can display letters or numbers to represent the phase sequence fault.
The control unit is also configured to send out a normal phase sequence command to control the switch unit to be powered on if the phase sequence of the power supply of the electrical equipment is not abnormal, so as to control the phase sequence detection unit to be powered off.
The switching unit is further configured to be in a state of being capable of disconnecting a power supply path between a power supply of the electrical equipment and the phase sequence detection unit under the condition that the normal phase sequence instruction is received, so that the power supply path between the power supply of the electrical equipment and the phase sequence detection unit is disconnected, that is, the phase sequence detection unit is powered off, and therefore the phase sequence detection unit stops detecting phase sequence parameters of the power supply of the electrical equipment, and energy consumption is saved. And under the condition that the electrical equipment is powered on again after being powered off, the power supply path between the power supply of the electrical equipment and the phase sequence detection unit is powered on again, namely, the phase sequence detection unit is powered on to detect whether the phase sequence of the power supply of the electrical equipment is abnormal or not again. Therefore, when the phase sequence is normal, the switching unit can cut off a loop of the phase sequence detection unit (such as a phase sequence detection circuit), so that the low power consumption mode is entered, and the power consumption is reduced.
In some embodiments, the switching unit that switches on a power supply path between a power supply of an electrical appliance and the phase sequence detection unit includes: and under the condition that the switch unit is not electrified, a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is switched on. Correspondingly, the switching unit, in case of receiving the normal phase sequence instruction, disconnects a power supply path between a power supply of the electrical equipment and the phase sequence detection unit, and includes: and under the condition of receiving the normal phase sequence instruction, the switch unit is electrified, so that a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is disconnected.
Therefore, the scheme of the invention provides a hardware circuit with low power consumption detection and control, namely a low power consumption phase sequence detection circuit, so that when the three-phase alternating current power supply of the multi-split external unit is in phase loss or reverse phase, after the main control board of the multi-split external unit is electrified, the phase sequence fault can be displayed through a nixie tube, and the multi-split external unit is prevented from being abnormal due to continuous work when the three-phase alternating current power supply is in phase loss or reverse phase. Furthermore, when the phase sequence is normal, the loop of the phase sequence detection circuit can be cut off, so that the low power consumption mode is entered, and the power consumption is further reduced.
Through a large number of tests, the technical scheme of the invention is adopted, and the phase sequence detection circuit is arranged and works only in a half alternating current period, so that when the three-phase alternating current power supply of the multi-connected outdoor unit is in phase loss or reverse phase, after the main control board of the multi-connected outdoor unit is electrified, the phase sequence fault is displayed through the phase sequence detection circuit, and therefore, fault reminding can be carried out when the three-phase alternating current power supply of the multi-connected outdoor unit is in phase loss or reverse phase, so that the multi-connected outdoor unit is prevented from continuously working and being abnormal when the three-phase alternating current power supply is in phase loss or reverse phase. In addition, since the phase sequence detection circuit operates only in a half ac cycle, power consumption can be reduced.
According to the embodiment of the invention, the electric equipment corresponding to the phase sequence detection device is also provided. The electric device may include: the phase sequence detection device described above.
Since the processes and functions implemented by the electrical apparatus of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
Through a large number of tests, the technical scheme of the invention is adopted, and the phase sequence detection circuit is arranged and works only in a half alternating current period, so that when the three-phase alternating current power supply of the multi-connected outdoor unit is in phase loss or reverse phase, after the main control board of the multi-connected outdoor unit is electrified, the phase sequence fault is displayed through the phase sequence detection circuit, and the power consumption is low.
According to an embodiment of the present invention, a phase sequence detection method corresponding to an electrical device is also provided, as shown in fig. 4, which is a schematic flow chart of an embodiment of the method of the present invention. The phase sequence detection method may include: step S110 to step S160.
At step S110, a state is placed in which a power supply path between the power supply source of the electrical appliance and the phase sequence detection unit can be turned on by the switch unit, so that the power supply path between the power supply source of the electrical appliance and the phase sequence detection unit is turned on, that is, the phase sequence detection unit is powered on.
At step S120, by the phase sequence detection unit, in a case where a power supply path between the phase sequence detection unit itself and a power supply source of an electrical apparatus is turned on, after the electrical apparatus is powered on, a phase sequence parameter of the power supply source of the electrical apparatus is detected.
In some embodiments, the step S120 of detecting, by a phase sequence detection unit, a phase sequence parameter of a power supply of the electrical device includes: the phase sequence detection unit works in a half alternating current period of a power supply of the electrical equipment to detect phase sequence parameters of the power supply of the electrical equipment. For example: the phase sequence detection circuit works only in half of the alternating current period, and power consumption can be reduced.
Fig. 3 is a schematic diagram of an embodiment of a low power phase sequence detection circuit. As shown in fig. 3, a low power phase sequence detection circuit includes: the phase sequence detection circuit comprises a connecting terminal CN1, an optical coupler U1, an optical coupler U2, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7.
In the example shown in fig. 3, when the dc relay J1 is not operating, the contacts 3 and 4 of the dc relay J1 are kept in a normally closed state. When the coil of the dc relay J1 is energized, the contact 5 and the contact 3 of the dc relay J1 are closed.
In the example shown in fig. 3, pins 1, 2, 3, and 4 of a connection terminal CN1 of the phase sequence detection circuit are connected to a neutral line N of a three-phase ac power supply and three-phase live lines L1, L2, and L3, respectively. Pin1 of the connection terminal CN1 is connected to the contact 4 of the dc relay J1, and is also connected to the anode of the diode D1 through the resistor R1. The cathode of diode D1 is connected to pin2 of terminal CN 1. Pin3 of terminal CN1 is connected to the anode of diode D2. The cathode of the diode D2 is connected to the anode of the diode side of the optocoupler U1 (i.e., pin1 of the optocoupler U1) via the resistor R2. Pin 4 of terminal CN1 is connected to the anode of diode D3. The cathode of the diode D3 is connected to the anode of the diode side of the optocoupler U2 (i.e., pin1 of the optocoupler U2) via the resistor R3. Diode D1, diode D2, diode D3, as rectifier diode, mainly play single-phase conduction effect, namely can pass through in the alternating current only half cycle, like this, guarantee to detect L2 and L3 only in the positive half cycle of alternating current, opto-coupler U1 and opto-coupler U2 are nonconducting when the negative half cycle of alternating current, have reduced phase sequence detection circuit's the power consumption that generates heat promptly, therefore this phase sequence detection circuit possesses the low-power consumption and detects the function. The resistor R1, the resistor R2 and the resistor R3 mainly play a role in limiting current and dividing voltage.
In the example shown in fig. 3, the cathode on the diode side of the optocoupler U1 (i.e., pin2 of the optocoupler U1) is connected to contact 3 of the dc relay J1. And the resistor R4 is connected between the pin1 and the pin2 of the optocoupler U1. The cathode of the diode side of the optocoupler U2 (i.e., pin2 of the optocoupler U2) is connected to contact 3 of the dc relay J1. And the resistor R5 is connected between the pin1 and the pin2 of the optocoupler U2. The resistor R4 and the resistor R5 are connected with the input ends of the optocoupler U1 and the optocoupler U2 in parallel, and are mainly used for shunting and rapidly discharging to adjust the current transmission ratio of the optocoupler U1 and the optocoupler U2.
In the example shown in fig. 3, the transistor-side collector of the optocoupler U1 (i.e., Pin3 of the optocoupler U1) serves as a port CPU _ Pin1, and is further connected to a dc power supply VCC via a resistor R6. The emitter of the transistor side of the optocoupler U1 (i.e., the 4-pin of the optocoupler U1) is grounded. The transistor-side collector of the optocoupler U2 (i.e., Pin3 of the optocoupler U2) serves as a port CPU _ Pin2, and is further connected to a dc power supply VCC via a resistor R76. The emitter of the transistor side of the optocoupler U2 (i.e., the 4-pin of the optocoupler U2) is grounded.
Referring to the example shown in fig. 3, the phase sequence detection circuit further includes: direct current relay J1, triode Q1, resistor R8 and resistor R9. A first end of the coil of the dc relay J1 (i.e., pin1 of the dc relay J1) is connected to a dc power source VCC and also connected to the cathode of the diode D4. The second terminal of the coil of the dc relay J1 (i.e., pin2 of the dc relay J1) is connected to the anode of the diode D4, and is also connected to the collector of the transistor Q1. The emitter of transistor Q1 is connected to ground. The base of the transistor Q1 is grounded through a resistor R9 and is used as a port CPU _ Pin3 through a resistor R8.
The port CPU _ Pin1, the port CPU _ Pin2 and the port CPU _ Pin3 are respectively connected to pins 1, 2 and 3 of the main control board CPU, and are mainly used for detecting signal levels. The port CPU _ Pin1 is connected to the output port of the CPU and normally outputs a low level. The port CPU _ Pin2 and the port CPU _ Pin3 are connected to the input port of the CPU and normally configured in a floating input mode. The resistor R6 and the resistor R7 are pull-up resistors. The diode D4 is a freewheeling diode. The direct current supply voltage provided by the direct current power supply VCC can be selected according to actual conditions.
At step S130, it is determined whether the phase sequence of the power supply of the electrical appliance is abnormal according to the phase sequence parameter through the control unit. And the number of the first and second groups,
in some embodiments, a specific process of determining whether the phase sequence of the power supply of the electrical device is abnormal or not according to the phase sequence parameter by the control unit in step S130 is described in the following exemplary description.
With reference to the flowchart of fig. 5, a specific process of the first process of determining whether the phase sequence of the power supply of the electrical equipment is abnormal in step S130 is further described, which includes: step S210 to step S230.
And step S210, determining whether the phase sequence parameter is in a set parameter range.
And step S220, if the phase sequence parameter is within the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is not abnormal.
And step S230, if the phase sequence parameter is not in the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is abnormal.
Referring to the example shown in fig. 3, since the phase difference between two adjacent phase lines of the live lines L1, L2, and L3 of the three-phase alternating current is 120 °, the phase loss or the reverse phase can be detected by detecting the time difference between the phase lines. In a related scheme, the power frequency alternating current is 50HZ, and the period is 1/50-20 ms. Since the phase difference between two adjacent phases is 120 °, the time difference between the waveforms of two adjacent phases is 20 × 120/360 — 6.67 ms. That is, L1 leads L2 by 6.67ms, and L2 leads L3 by 6.67 ms. When operating in a 60Hz AC grid, L1 leads L2 by 5.56ms, and L2 leads L3 by 5.56 ms.
When the phase sequence is normal, the negative half cycle of L1 flows into the neutral line through diode D1, resistor R1. The positive half cycle of the L2 flows into a zero line through a diode D2, a resistor R1, a resistor R2, a resistor R4 and the input end of an optical coupler U1. The positive half cycle of the L3 flows into a zero line through a diode D3, a resistor R3, a resistor R5 and the input end of an optical coupler U2. Therefore, the input ends of the optocoupler U1 and the optocoupler U2 are sequentially conducted, and the port CPU _ Pin1 and the port CPU _ Pin2 are sequentially changed from high level to low level. When the power is 50Hz, the main chip detects that the Pin low time of the port CPU _ Pin1 is about 6.67ms before the Pin low time of the port CPU _ Pin2, so that no phase sequence fault is judged.
The main control board takes the voltage of live line L1 and neutral line N. The main control board is not operated when L1 is out of phase. When the live wire L2 or the live wire L3 is out of phase, the corresponding port CPU _ Pin1 or the corresponding port CPU _ Pin2 has no signal output, and a phase sequence protection fault is reported. When the reverse phase condition occurs, the time difference between the port CPU _ Pin1 and the port CPU _ Pin2 is not within the normal range, and thus a phase sequence fault is reported.
In the example shown in fig. 3, since the dc relay J1, the transistor Q1, the resistor R8, the resistor R9, and the diode D4 are provided, the common terminal of the phase sequence detection circuit can be disconnected, and the standby power consumption of the main control board is reduced. Specifically, when the phase sequence needs to be detected, the coil of the direct current relay J1 is attracted, the contact is conducted, and the phase sequence detection circuit works. When the phase sequence detection is finished, the direct current relay J1 is switched off, no current flows through the phase sequence detection circuit, the power consumption can be effectively reduced, and the low-power-consumption phase sequence detection is realized.
In some embodiments, a specific process of determining whether the phase sequence of the power supply of the electrical device is abnormal or not according to the phase sequence parameter by the control unit in step S130 is also described in the following exemplary description.
With reference to the flowchart of fig. 6, a specific process of the second process for determining whether the phase sequence of the power supply of the electrical equipment is abnormal in step S130 is further described, which includes: step S310 to step S330.
Step S310, under the condition that the phase sequence of the power supply of the electrical equipment is abnormal and the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is already sent out, or under the condition that the phase sequence of the power supply of the electrical equipment is not abnormal, whether the phase sequence parameter is in the set parameter range is continuously determined within the set time.
Step S320, if the phase sequence parameter is within the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is not abnormal, and if a notification message that the phase sequence of the power supply of the electrical equipment is abnormal has been initiated, stopping initiating the notification message that the phase sequence of the power supply of the electrical equipment is abnormal.
Step S330, if the phase sequence parameter is not in the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is abnormal, and initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal. Specifically, if a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal has been initiated, the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is continuously initiated. If the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is not initiated, the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is initiated.
Referring to the example shown in fig. 2, a workflow of a low power phase sequence detection circuit further includes: in order to prevent false alarm or failure, the phase sequence detection circuit will continue to detect for t time (t is selected according to practical application). If the phase sequence fault is still detected within the time t, the nixie tube always displays the phase sequence fault. If the phase sequence fault is recovered due to external factors or other factors within the time t, the nixie tube can normally display at the moment, the main control board normally works, and then the phase sequence detection circuit enters a low power consumption mode to stop detection. Therefore, the standby and operation of the unit in the lowest power consumption state are ensured while the phase sequence of the power supply is effectively monitored.
By using the low-power phase sequence detection circuit provided by the example shown in fig. 3, if a phase sequence fault is detected all the time within the power-on time t, the nixie tube reports the phase sequence protection fault. When the time for detecting that L2 leads L3 or L1 leads L2 is in the range of 5-8ms (5-8ms is selected according to practical application), the phase sequence time difference is considered to be in the normal range, the chip judges that the phase sequence is normal, otherwise, phase sequence protection is reported.
If the phase sequence is detected to be normal after electrifying for t time, at the moment, the nixie tube can normally display, the Pin3 of the CPU of the connection port CPU _ Pin3 outputs high level, the triode Q1 is conducted, the coil of the direct current relay J1 is electrified, the contact 3 and the contact 5 of the direct current relay J1 are conducted, and the phase sequence detection circuit stops working and enters a low power consumption mode. When the phase sequence is still normal after the time t, the direct current relay J1 cuts off the detection loops of L2 and L3 and enters a low power consumption mode, so that the phase sequence detection circuit has a low power consumption control function.
In step S140, a control unit initiates a warning message that the phase sequence of the power supply of the electrical equipment is abnormal if the phase sequence of the power supply of the electrical equipment is abnormal. For example: and displaying the abnormal fault condition of the phase sequence through a digital tube of a main control board of an electrical device such as a multi-split outdoor unit.
Fig. 2 is a schematic diagram of a working flow of an embodiment of a low power consumption phase sequence detection circuit. As shown in fig. 2, a working flow of a low power consumption phase sequence detection circuit includes: after the power supply of the main control board of the multi-split outdoor unit is input, the phase sequence detection circuit starts to work. Then, the CPU of the main control board judges whether a phase sequence fault occurs through the phase sequence detection circuit. When the phase sequence is abnormal (such as phase loss or reverse phase), the nixie tube on the main control board can immediately report the phase sequence fault, namely the nixie tube can display letters or numbers to represent the phase sequence fault.
In step S150, if the phase sequence of the power supply of the electrical equipment is not abnormal, a phase sequence normal instruction is issued to control the switch unit to be powered on, so as to control the phase sequence detection unit to be powered off.
At step S160, when the phase sequence normal instruction is received, the switch unit is in a state of disconnecting the power supply path between the power supply of the electrical equipment and the phase sequence detection unit, so as to disconnect the power supply path between the power supply of the electrical equipment and the phase sequence detection unit, that is, to disconnect the power supply path between the power supply of the electrical equipment and the phase sequence detection unit, so that the phase sequence detection unit stops detecting the phase sequence parameter of the power supply of the electrical equipment, thereby saving energy consumption. And under the condition that the electrical equipment is powered on again after being powered off, the power supply path between the power supply of the electrical equipment and the phase sequence detection unit is powered on again, namely, the phase sequence detection unit is powered on to detect whether the phase sequence of the power supply of the electrical equipment is abnormal or not again.
In some embodiments, the step S110 of turning on a power supply path between a power supply of an electrical appliance and the phase sequence detection unit through a switch unit includes: and under the condition that the switch unit is not electrified, a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is switched on. Correspondingly, in step S160, in the case that the normal phase sequence command is received, disconnecting a power supply path between a power supply of the electrical equipment and the phase sequence detection unit by the switch unit includes: and under the condition of receiving the normal phase sequence instruction, the switch unit is electrified, so that a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is disconnected.
And the switch unit is arranged between a power supply of the electrical equipment and the phase sequence detection unit. And the control unit is respectively connected with the phase sequence detection unit and the switch unit. And a phase sequence detection unit, such as a phase sequence detection circuit. And the switch unit is a switch circuit formed by a direct current relay J1 and a triode Q1. The control unit may be an electrical device such as a main control board CPU of the multi-split air conditioner. Electrical equipment, such as multi-split outdoor units.
Therefore, the scheme of the invention provides a hardware circuit with low power consumption detection and control, namely a low power consumption phase sequence detection circuit, so that when the three-phase alternating current power supply of the multi-split external unit is in phase loss or reverse phase, after the main control board of the multi-split external unit is electrified, the phase sequence fault can be displayed through a nixie tube, and the multi-split external unit is prevented from being abnormal due to continuous work when the three-phase alternating current power supply is in phase loss or reverse phase. Furthermore, when the phase sequence is normal, the loop of the phase sequence detection circuit can be cut off, so that the low power consumption mode is entered, and the power consumption is further reduced.
Since the processes and functions implemented by the method of the present embodiment substantially correspond to the embodiments, principles, and examples of the electrical apparatus, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of the present embodiment.
After a large number of tests verify that the technical scheme of the embodiment is adopted, the phase sequence detection circuit is arranged and works only in a half alternating current period, so that when the three-phase alternating current power supply of the multi-connected external machine is in phase loss or reverse phase, after the main control board of the multi-connected external machine is electrified, the phase sequence fault is displayed through the phase sequence detection circuit, and the low-power-consumption phase sequence detection is realized.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (15)

1. A phase sequence detection apparatus, comprising: the phase sequence detection unit, the switch unit and the control unit; wherein the content of the first and second substances,
the switching unit is configured to turn on a power supply path between a power supply source of an electrical appliance and the phase sequence detection unit;
the phase sequence detection unit is configured to detect a phase sequence parameter of a power supply source of an electrical apparatus after the electrical apparatus is powered on under the condition that a power supply path between the phase sequence detection unit and the power supply source of the electrical apparatus is connected;
the control unit is configured to determine whether the phase sequence of the power supply of the electrical equipment is abnormal or not according to the phase sequence parameter; and the number of the first and second groups,
if the phase sequence of the power supply of the electrical equipment is abnormal, initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal;
if the phase sequence of the power supply of the electrical equipment is not abnormal, sending a normal phase sequence instruction;
the switch unit is further configured to disconnect a power supply path between a power supply of an electrical device and the phase sequence detection unit when the phase sequence normal instruction is received.
2. The phase sequence detecting apparatus according to claim 1, wherein,
the switching unit, make the power supply route switch on between electrical equipment's power supply and the phase sequence detecting element, include: under the condition that the switch unit is not electrified, a power supply path between a power supply of electrical equipment and the phase sequence detection unit is switched on;
the switching unit, under the condition that receives the normal instruction of phase sequence, make the power supply route disconnection between electrical equipment's power supply and the phase sequence detecting element, include: and under the condition of receiving the normal phase sequence instruction, the switch unit is electrified, so that a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is disconnected.
3. The phase sequence detection device according to claim 1, wherein the phase sequence detection unit detects a phase sequence parameter of a power supply of the electrical apparatus, and includes:
the method comprises the steps of working in a half alternating current period of a power supply of the electrical equipment to detect phase sequence parameters of the power supply of the electrical equipment.
4. The phase sequence detecting apparatus according to any one of claims 1 to 3, wherein the power supply source of the electrical appliance includes: a three-phase AC power supply; the phase sequence parameters comprise: the time difference between two adjacent phase lines of the three-phase alternating-current power supply;
the phase sequence detection unit includes: the device comprises a first detection module, a second detection module and a third detection module; wherein the content of the first and second substances,
the first detection module is arranged between a first phase line and a zero line of the three-phase alternating-current power supply; in the positive half period of the second phase line of the three-phase alternating-current power supply, the second phase line of the three-phase alternating-current power supply passes through the second detection module and the switch unit and then is communicated to the zero line of the three-phase alternating-current power supply; in the positive half period of the third phase line of the three-phase alternating-current power supply, the third phase line of the three-phase alternating-current power supply passes through the third detection module and the switch unit and then is communicated to the zero line of the three-phase alternating-current power supply;
the second detection module is arranged between a second phase line and a zero line of the three-phase alternating-current power supply and can output a time difference between the first phase line and the second phase line of the three-phase alternating-current power supply;
the third detection module is arranged between a third phase line and a zero line of the three-phase alternating-current power supply and can output a time difference between the first phase line and the second phase line of the three-phase alternating-current power supply.
5. The phase sequence detection apparatus of claim 4, wherein the first detection module comprises: the first diode module and the first current limiting module; the first phase line of the three-phase alternating current power supply is connected to the cathode of the first diode module; the anode of the first diode module is connected to a zero line of the three-phase alternating current power supply after passing through the first current limiting module;
the second detection module includes: the second diode module, the second current limiting module and the first optical coupling module; the second phase line of the three-phase alternating current power supply is connected to the anode of the second diode module; the cathode of the second diode module is connected to the anode of the diode side of the first optocoupler module after passing through the second current limiting module; the cathode of the diode side of the first optocoupler module is connected to a zero line of the three-phase alternating-current power supply after passing through the switch unit; a collector electrode at the transistor side of the first optocoupler module can output a time difference between a first phase line and a second phase line of the three-phase alternating-current power supply;
the third detection module includes: the third diode module, the third current limiting module and the second optical coupling module; the third phase line of the three-phase alternating current power supply is connected to the anode of the third diode module; the cathode of the third diode module is connected to the anode of the diode side of the first optocoupler module after passing through the third current limiting module; a cathode at the diode side of the second optocoupler module is connected to a zero line of the three-phase alternating-current power supply after passing through the switch unit; and a collector electrode at the transistor side of the second optocoupler module can output the time difference between a second phase line and a third phase line of the three-phase alternating-current power supply.
6. The phase sequence detection apparatus of claim 5, wherein the second detection module further comprises: a first shunting module; the first shunt module is arranged between the anode and the cathode of the diode side of the first optical coupling module;
the third detection module further includes: a second shunting module; and the second shunt module is arranged between the anode and the cathode of the diode side of the second optical coupling module.
7. The phase sequence detecting apparatus according to claim 4, wherein the switching unit includes: the relay module, the switch tube module and the fourth current limiting module; the contact of the relay module includes: a first contact, a second contact, and a third contact; a third contact of the relay module is suspended; the second contact of the relay module is connected to a zero line of the three-phase alternating-current power supply; the first contact of the relay module is respectively connected to the second detection module and the third detection module; in the case of a connection of the second contact of the relay module and the first contact of the relay module, the switching unit itself is not energized; the switching unit is energized by itself when the third contact of the relay module is connected to the first contact of the relay module;
the coil of the relay module is connected to the first connecting end of the switch tube module; the second connecting end of the switch tube module is grounded; a first contact of the relay module of the switching tube module is connected to the control unit after passing through the fourth current limiting module and is used for receiving the normal phase sequence instruction;
under the condition that the first contact of the relay module of the switch tube module receives the normal instruction of the phase sequence, the second contact of the relay module is disconnected with the first contact of the relay module, and the third contact of the relay module is connected with the first contact of the relay module.
8. The phase sequence detection device according to any one of claims 1 to 3, wherein the control unit determines whether the phase sequence of the power supply of the electrical equipment is abnormal according to the phase sequence parameter, and includes:
determining whether the phase sequence parameter is within a set parameter range;
if the phase sequence parameter is within the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is not abnormal;
and if the phase sequence parameter is not in the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is abnormal.
9. The phase sequence detection apparatus according to claim 8, wherein the control unit determines whether the phase sequence of the power supply of the electrical device is abnormal according to the phase sequence parameter, further comprising:
under the condition that the phase sequence of the power supply of the electrical equipment is abnormal and a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is sent out, or under the condition that the phase sequence of the power supply of the electrical equipment is not abnormal, whether the phase sequence parameter is in a set parameter range or not is continuously determined within set time;
if the phase sequence parameter is within the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is not abnormal, and if a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is initiated, stopping initiating the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal;
and if the phase sequence parameter is not in the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is abnormal, and initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal.
10. An electrical device, comprising: the phase sequence detection apparatus of any one of claims 1 to 9.
11. A method for phase sequence detection, comprising:
the power supply path between the power supply of the electrical equipment and the phase sequence detection unit is switched on through the switch unit;
detecting, by a phase sequence detection unit, a phase sequence parameter of a power supply of an electrical apparatus after the electrical apparatus is powered on under a condition that a power supply path between the phase sequence detection unit itself and the power supply of the electrical apparatus is connected;
determining whether the phase sequence of the power supply of the electrical equipment is abnormal or not according to the phase sequence parameter through a control unit; and the number of the first and second groups,
if the phase sequence of the power supply of the electrical equipment is abnormal, initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal;
if the phase sequence of the power supply of the electrical equipment is not abnormal, sending a normal phase sequence instruction;
and through the switch unit, under the condition of receiving the normal phase sequence instruction, disconnecting a power supply path between a power supply of the electrical equipment and the phase sequence detection unit.
12. The phase sequence detection method according to claim 11, wherein,
through the switch element, make the power supply route switch-on between electrical equipment's power supply and the phase sequence detecting element, include: under the condition that the switch unit is not electrified, a power supply path between a power supply of electrical equipment and the phase sequence detection unit is switched on;
through the switch unit, under the condition that receives the normal instruction of phase sequence, make the power supply route disconnection between electrical equipment's power supply and the phase sequence detecting element, include: and under the condition of receiving the normal phase sequence instruction, the switch unit is electrified, so that a power supply path between a power supply of the electrical equipment and the phase sequence detection unit is disconnected.
13. The phase sequence detection method according to claim 11, wherein detecting the phase sequence parameter of the power supply of the electrical equipment by a phase sequence detection unit comprises:
the method comprises the steps of working in a half alternating current period of a power supply of the electrical equipment to detect phase sequence parameters of the power supply of the electrical equipment.
14. The phase sequence detection method according to any one of claims 11 to 13, wherein determining, by a control unit, whether the phase sequence of the power supply of the electrical appliance is abnormal according to the phase sequence parameter comprises:
determining whether the phase sequence parameter is within a set parameter range;
if the phase sequence parameter is within the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is not abnormal;
and if the phase sequence parameter is not in the set parameter range, determining that the phase sequence of the power supply of the electrical equipment is abnormal.
15. The phase sequence detection method according to claim 14, wherein determining, by a control unit, whether a phase sequence of a power supply of the electrical appliance is abnormal according to the phase sequence parameter, further comprises:
under the condition that the phase sequence of the power supply of the electrical equipment is abnormal and a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is sent out, or under the condition that the phase sequence of the power supply of the electrical equipment is not abnormal, whether the phase sequence parameter is in a set parameter range or not is continuously determined within set time;
if the phase sequence parameter is within the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is not abnormal, and if a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal is initiated, stopping initiating the reminding message that the phase sequence of the power supply of the electrical equipment is abnormal;
and if the phase sequence parameter is not in the set parameter range within the set time, determining that the phase sequence of the power supply of the electrical equipment is abnormal, and initiating a reminding message that the phase sequence of the power supply of the electrical equipment is abnormal.
CN202110758258.8A 2021-07-05 2021-07-05 Phase sequence detection device and method and electrical equipment Pending CN113267685A (en)

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Application Number Priority Date Filing Date Title
CN202110758258.8A CN113267685A (en) 2021-07-05 2021-07-05 Phase sequence detection device and method and electrical equipment

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Application Number Priority Date Filing Date Title
CN202110758258.8A CN113267685A (en) 2021-07-05 2021-07-05 Phase sequence detection device and method and electrical equipment

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113866628A (en) * 2021-11-19 2021-12-31 国网辽宁省电力有限公司鞍山供电公司 Switch state analysis method based on current and voltage two-phase sequence comparison

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113866628A (en) * 2021-11-19 2021-12-31 国网辽宁省电力有限公司鞍山供电公司 Switch state analysis method based on current and voltage two-phase sequence comparison
CN113866628B (en) * 2021-11-19 2023-12-19 国网辽宁省电力有限公司鞍山供电公司 Switch state analysis method based on current and voltage double-phase sequence comparison

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