CN110780126B - Phase sequence detection device and method and air conditioning equipment - Google Patents
Phase sequence detection device and method and air conditioning equipment Download PDFInfo
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- CN110780126B CN110780126B CN201911136736.0A CN201911136736A CN110780126B CN 110780126 B CN110780126 B CN 110780126B CN 201911136736 A CN201911136736 A CN 201911136736A CN 110780126 B CN110780126 B CN 110780126B
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- 238000001514 detection method Methods 0.000 title claims abstract description 118
- 238000000819 phase cycle Methods 0.000 title claims abstract description 81
- 238000004378 air conditioning Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 37
- 230000003287 optical effect Effects 0.000 claims description 21
- 238000003860 storage Methods 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
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- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
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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
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- 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
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Abstract
The invention discloses a phase sequence detection device, a phase sequence detection method and air conditioning equipment. Wherein the device includes: the detection circuit and the MCU; the detection circuit includes: the indication unit is connected between a first phase of the three-phase power supply and a zero line of the three-phase power supply and is used for indicating the conduction condition of the first phase; the input end of the first detection unit is connected between the second phase of the three-phase power supply and the zero line; the input end of the second detection unit is connected between a third phase of the three-phase power supply and the zero line; one of the input ends of the first detection unit and the second detection unit is also connected with a first phase of a three-phase power supply; and the input end of the MCU is respectively connected with the output ends of the first detection unit and the second detection unit. The invention realizes the phase sequence detection of the three-phase power supply, has simple circuit structure and simple control, and can solve the problem of large circuit occupation area.
Description
Technical Field
The invention relates to the technical field of alternating current, in particular to a phase sequence detection device and method and air conditioning equipment.
Background
According to the development situation of the current society, the air conditioner field is continuously expanded, the user demand is also continuously improved, the market competitiveness is increased to adapt to the market demand, the market development is satisfied, and some special adjustment needs to be made to the air conditioner.
When the air conditioner has a requirement on the phase sequence of the power supply, the phase sequence needs to be detected, so that abnormal operation of the air conditioner is avoided, but the current circuit with the function has fewer types, faces various bottleneck problems, is difficult in circuit design and is complex in implementation process;
aiming at the problems of difficult design and complex implementation process of a phase sequence detection circuit in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides a phase sequence detection device, a phase sequence detection method and air conditioning equipment, which are used for solving the problems of difficult circuit design and complex implementation process in the prior art.
In order to solve the technical problems, the present invention provides a phase sequence detection device, wherein the device includes: the detection circuit and the MCU; wherein,
The detection circuit includes:
The indication unit is connected between a first phase of the three-phase power supply and a zero line of the three-phase power supply and is used for indicating the conduction condition of the first phase;
the first connecting end of the input end of the first detection unit is connected with the second phase of the three-phase power supply;
the first connecting end of the input end of the second detection unit is connected with a third phase of the three-phase power supply; the first end of the connecting bus is connected with a zero line of the three-phase power supply, and the second end of the connecting bus is connected with a first phase of the three-phase power supply through an indicating unit;
The input end of the MCU is respectively connected with the output ends of the first detection unit and the second detection unit, and the MCU is used for receiving detection signals of the first detection unit and the second detection unit so as to judge whether the phase sequence of the three-phase power supply is normal.
Further, the indication unit comprises a first indication element and a second indication element which are connected in parallel in an anti-direction, wherein the anode of the first indication element is connected with the first phase of the three-phase power supply, the cathode of the first indication element is connected with the zero line of the three-phase power supply, the anode of the second indication element is connected with the zero line of the three-phase power supply, and the cathode of the second indication element is connected with the first phase of the three-phase power supply.
Further, the first detection unit is a first optocoupler, the anode of a diode at the input end of the first optocoupler is connected with the second phase of the three-phase power supply, the cathode of the diode at the input end of the first optocoupler is connected with the zero line of the three-phase power supply, the cathode of the diode at the input end of the first optocoupler is also connected with the first phase of the three-phase power supply through the indication unit, and the output end of the first optocoupler is connected with the MCU;
the second detection unit is a second optocoupler, the anode of a diode at the input end of the second optocoupler is connected with a third phase of the three-phase power supply, the cathode of the diode at the input end of the second optocoupler is connected with a zero line of the three-phase power supply, the cathode of the diode at the input end of the second optocoupler is also connected with a first phase of the three-phase power supply through the indication unit, and the output end of the second optocoupler is connected with the MCU.
Further, a first rectifying element is connected between a first connecting end and a second connecting end of the input end of the first optocoupler, and the directions of the first rectifying element and a diode of the input end of the first optocoupler are opposite; and/or the number of the groups of groups,
And a second rectifying element is connected between the first connecting end and the second connecting end of the input end of the second optocoupler, and the direction of the second rectifying element is opposite to that of a diode of the input end of the second optocoupler.
Further, the apparatus further comprises:
a controllable switch module comprising:
the input end of the first switch unit is connected with the MCU, and the output end of the first switch unit is connected with a first phase of the three-phase power supply;
the input end of the second switch unit is connected with the MCU, and the output end of the second switch unit is connected with a second phase of the three-phase power supply;
and the input end of the third switch unit is connected with the MCU, and the output end of the third switch unit is connected with a third phase of the three-phase power supply.
Further, the first switch unit comprises a first switch tube and a third optical coupler, the input end of the first switch tube is connected with the MCU, the input end of the third optical coupler is connected with the output end of the first switch tube, the first connection end of the output end of the third optical coupler is connected with a first phase of the three-phase power supply, and the second connection end of the output end is connected with a zero line of the three-phase power supply through the indication unit; and/or the number of the groups of groups,
The second switch unit comprises a second switch tube and a fourth optical coupler, the input end of the second switch tube is connected with the MCU, the input end of the fourth optical coupler is connected with the output end of the second switch tube, the first connecting end of the output end of the fourth optical coupler is connected with the second phase of the three-phase power supply, and the second connecting end of the output end is connected with the first connecting end of the input end of the first detection unit; and/or the number of the groups of groups,
The third switch unit comprises a third switch tube and a fifth optical coupler, the input end of the third switch tube is connected with the MCU, the input end of the fifth optical coupler is connected with the output end of the third switch tube, the first connecting end of the output end of the fifth optical coupler is connected with the third phase of the three-phase power supply, and the second connecting end of the output end is connected with the first connecting end of the input end of the second detection unit.
Further, a first resistor is connected between a first connection end of the third optocoupler output end and a first phase of the three-phase power supply; and/or a second resistor is connected between the first connecting end of the fourth optical coupler output end and the second phase of the three-phase power supply; and/or a third resistor is connected between the first connecting end of the fifth optocoupler output end and a third phase of the three-phase power supply.
The invention also provides air conditioning equipment, which comprises a three-phase power supply and the phase sequence detection device.
The invention also provides a phase sequence detection method which is applied to the phase sequence detection device, wherein the method comprises the following steps:
after the first signal of the three-phase power supply is obtained, detecting a second signal and a third signal; the first signal is used for representing whether the first phase is conducted forward, the second signal is used for representing whether the second phase is conducted forward, and the third signal is used for representing whether the third phase is conducted forward;
and judging whether the phase sequence of the three-phase power supply is normal, phase failure or reverse according to the time interval and sequence of the acquired first signal, the second signal and the third signal.
Further, judging whether the phase sequence of the three-phase power supply is normal, phase failure or reverse according to the time interval and sequence of the first signal, the second signal and the third signal, including:
Judging whether a second signal is acquired after the preset time for acquiring the first signal;
if so, judging whether the three-phase voltage is normal in phase sequence or is a third phase loss according to whether a third signal can be obtained after the preset time is further elapsed;
if not, judging whether the three-phase power supply is a second phase failure or a first phase and a second phase opposite phase according to the signals obtained after the preset time.
Further, if yes, further according to whether the third signal can be obtained after the preset time, judging that the three-phase voltage is normal in phase sequence or that the third phase is out of phase, including:
judging whether a third signal is acquired after the preset time for acquiring the second signal;
if yes, judging that the three-phase voltage phase sequence is normal;
If not, judging that the third phase of the three-phase power supply is out of phase.
Further, if not, judging whether the three-phase power supply is a second phase failure or a first phase and a second phase opposite phase according to the signal obtained after the preset time, including:
After judging that the preset time passes, acquiring a second signal or a third signal;
if the third signal is obtained, judging that the second phase of the three-phase power supply is out of phase;
and if the second signal is acquired, judging the first phase and the second phase opposite phases of the three-phase power supply.
Further, after determining the first phase and the second phase of the three-phase power supply, the method further includes:
Continuing to acquire the third signal;
And if the interval between the time when the third signal is acquired and the time when the second signal is acquired is twice the preset time, judging the second phase and the third phase as the reverse phase.
Further, judging whether the phase sequence of the three-phase power supply is normal, phase failure or reverse according to the time interval and sequence of the first signal, the second signal and the third signal, and further comprising:
And if the third signal is obtained after the preset time of the first signal is obtained and the second signal is detected after the preset time is further elapsed, judging the second phase and the third reverse phase of the three-phase power supply.
Further, the first signal is generated when a first indicating element is lighted, wherein an anode of the first indicating element is connected with a first phase of the three-phase power supply, and a cathode of the first indicating element is connected with a zero line of the three-phase power supply;
the second signal is generated when the first optocoupler is in forward conduction and outputs a low level, wherein the anode of a diode at the input end of the first optocoupler is connected with the second phase of the three-phase power supply, the cathode of the diode is connected with the first phase of the three-phase power supply, and the output end of the first optocoupler is connected with the MCU;
The third signal is generated when the second optocoupler is in forward conduction and outputs a low level, wherein the anode of a diode at the input end of the second optocoupler is connected with a third phase of the three-phase power supply, the cathode of the diode is connected with a first phase of the three-phase power supply, and the output end of the second optocoupler is connected with the MCU.
Further, after judging that the phase sequence of the three-phase power supply is normal, phase failure or phase reversal according to the time interval and sequence of the first signal, the second signal and the third signal, the method further comprises:
The first switch unit, the second switch unit and the third switch unit are controlled to be turned off, and then the detection circuit is controlled to be turned off.
Further, the method further comprises:
Judging whether the air conditioner has operation requirements or not;
If so, controlling the first switch unit, the second switch unit and the third switch unit to be conducted so as to control the first phase of the three-phase power supply, the third phase of the three-phase power supply and the third phase of the three-phase power supply to be conducted;
If not, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off so as to control the first phase of the three-phase power supply, the third phase of the three-phase power supply and the third phase of the three-phase power supply to be turned off.
The present invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the above method.
By applying the technical scheme of the invention, the conduction condition of the first phase of the three-phase power supply is indicated through the indication unit, the conduction condition of the second phase of the three-phase power supply is detected through the first detection unit, the conduction condition of the third phase of the three-phase power supply is detected through the second detection unit, the conduction conditions of the first phase, the second phase and the third phase of the three-phase power supply are synthesized, whether the three-phase power supply is in phase failure or in reverse phase is judged, the circuit structure is simple, the control is simple and easy, and meanwhile, the problem of large circuit occupation area can be solved.
Drawings
Fig. 1 is a structural diagram of a phase sequence detecting device according to an embodiment of the present invention;
fig. 2 is a block diagram of a phase sequence detecting apparatus according to another embodiment of the present invention;
FIG. 3 is a block diagram of a phase sequence detection apparatus according to yet another embodiment of the present invention;
fig. 4 is a flowchart of a phase sequence detection method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the detection units in the embodiments of the present invention, these detection units should not be limited to these terms. These terms are only used to distinguish between detection units that perform different functions. For example, a first detection unit may also be referred to as a second detection unit, and similarly, a second detection unit may also be referred to as a first detection unit, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such elements.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
This embodiment provides a phase sequence detecting device, fig. 1 is a structural diagram of the phase sequence detecting device according to an embodiment of the present invention, as shown in fig. 1, the device includes: a detection circuit 11 and an MCU12; wherein the detection circuit 11 includes: an indication unit 111, connected between the first phase L1 of the three-phase power supply and the zero line N of the three-phase power supply 13, for indicating the conduction condition of the first phase L1; the first detection unit 112, the first connection end of the input end is connected with the second phase L2 of the three-phase power supply 13; a second detection unit 113, the first connection end of the input end is connected with a third phase L3 of the three-phase power supply 13; the second connection end of the input end of the first detection unit 112 is connected with the second connection end of the input end of the second detection unit 113 to form a connection bus, the first end of the connection bus is connected with the zero line of the three-phase power supply 13, and the second end of the connection bus is connected with the first phase L1 of the three-phase power supply 13 through an indication unit; the input end of the MCU12 is connected to the output ends of the first detection unit 112 and the second detection unit 113, respectively, and is configured to receive detection signals of the first detection unit 112 and the second detection unit 113, so as to determine whether the phase sequence of the three-phase power supply 13 is normal.
According to the phase sequence detection device, the indication unit 111 is used for indicating the conduction condition of the first phase L1 of the three-phase power supply, the first detection unit 112 is used for detecting the conduction condition of the second phase L2 of the three-phase power supply 13, the second detection unit 113 is used for detecting the conduction condition of the third phase L3 of the three-phase power supply 13, and the conduction conditions of the first phase L1, the second phase L2 and the third phase L3 of the three-phase power supply 13 are combined to judge whether the three-phase power supply 13 is in a phase failure or not.
Example 2
Fig. 2 is a block diagram of a phase sequence detecting device according to another embodiment of the present invention, in order to determine whether the first phase L1 of the three-phase unit 13 is conducting and the conducting direction, as shown in fig. 2, on the basis of the above embodiment, the indicating unit 111 includes a first indicating element 111a and a second indicating element 111b connected in reverse parallel, where the anode of the first indicating element 111a is connected to the first phase L1 of the three-phase power supply 13, the cathode is connected to the zero line N of the three-phase power supply 13, the anode of the second indicating element 111b is connected to the zero line N of the three-phase power supply, the cathode is connected to the first phase L1 of the three-phase power supply 13, the first indicating element 111a indicates forward conduction of the first phase L1, and the second indicating element 111b indicates reverse conduction of the first phase L1, where the forward conduction indicates that the current flows from the first phase L1 to the zero line N, and the reverse conduction indicates that the current flows from the zero line N to the first phase L1, specifically, the first indicating element 111a and the second indicating element 111b have a unidirectional conduction characteristic.
In order to isolate the input signal from the output signal when the second phase L2 and the third phase L3 of the three-phase power supply 13 are in the on state, as shown in fig. 2, the first detection unit 112 is a first optocoupler, the diode anode at the input end of the first optocoupler is connected with the second phase L2 of the three-phase power supply 13, the cathode is connected with the zero line N of the three-phase power supply 13, the output end of the first optocoupler is connected with the MCU12, the second detection unit 113 is a second optocoupler, the diode anode at the input end of the second optocoupler is connected with the third phase L3 of the three-phase power supply 13, the cathode is connected with the zero line N of the three-phase power supply 13, the output end of the second optocoupler is connected with the MCU12, the isolation between the strong electric signal input by the electric signal and the output side signal can be realized, in order to realize the zero loss of the three-phase power supply, the second phase L2 and the third phase L3 of the three-phase power supply 13 can still be respectively conducted with the first phase L1, and the first detection unit 112 and the second detection unit 113 are further connected with the first phase L1 through the diode anode 111, and the weak point of the first phase power supply is further connected with the first phase power supply 1 through the diode 111.
In order to reversely conduct the zero line L of the three-phase power supply 13 with the second phase L2, that is, conduct the current flowing from the zero line L to the second phase L2, as shown in fig. 2, on the basis of the above embodiment, a first rectifying element D1 is further connected between the first connection end and the second connection end of the first optocoupler input end, the first rectifying element is a diode, the direction of the first rectifying element is opposite to that of the diode of the input end of the first optocoupler, specifically, the anode of the first rectifying element D1 is connected with the zero line N of the three-phase power supply 13, and the cathode is connected with the second phase L2;
In order to make the zero line L of the three-phase power supply 13 and the third phase L3 conduct reversely, that is, the current flowing from the zero line L to the third phase L3 conducts, as shown in fig. 2, on the basis of the above embodiment, a second rectifying element D2 is connected between the first connection end and the second connection end of the second optocoupler input end, the second rectifying element is a diode, and the direction of the second rectifying element is opposite to that of the diode of the input end of the second optocoupler, specifically, the anode of the first rectifying element D1 is connected with the zero line N of the three-phase power supply 13, and the cathode is connected with the third phase L3.
In order to make the on state of the detection circuit controllable, when the phase sequence is not needed to be detected, the detection circuit can be controlled to be turned off in time, as shown in fig. 2, and on the basis of the embodiment, the device further includes: a controllable switch module 14 comprising: a first switch unit 141, an input end of which is connected to the MCU12, and an output end of which is connected to the first phase L1 of the three-phase power supply 13; a second switch unit 142, an input end of which is connected to the MCU12, and an output end of which is connected to the second phase L2 of the three-phase power supply 13; and the input end of the third switching unit 143 is connected to the MCU12, the output end of the third switching unit 143 is connected to the third phase L3 of the three-phase power supply 13, wherein the first switching unit 141 is used for controlling the on or off of the first phase L1 of the three-phase power supply 13, the second switching unit 142 is used for controlling the on or off of the second phase L2 of the three-phase power supply 13, and the third switching unit 143 is used for controlling the on or off of the third phase L3 of the three-phase power supply 13.
In order to control the on or off of the first phase L1, the second phase L2, and the third phase L3 of the three-phase power supply 13, as shown in fig. 2, on the basis of the above embodiment, the first switching unit 141 includes a first switching tube 141a and a third optocoupler 141b, the input end of the first switching tube 141a is connected to the MCU12, the input end of the third optocoupler 141b is connected to the first switching tube 141a, the first connection end of the output end is connected to the first phase L1 of the three-phase power supply 13, the second connection end of the output end is connected to the zero line N of the three-phase power supply 13 through the indicating unit, when the phase sequence needs to be detected, the MCU12 controls the first switching tube 141a to be turned on, and then controls the third optocoupler 141b to be turned on, and when the phase sequence needs to be detected to be stopped, the MCU12 controls the first switching tube 141a to be turned off, and then controls the third optocoupler 141b to be turned off, so as to control the first phase L1 to be turned off; the second switching unit 142 includes a second switching tube 142a and a fourth optocoupler 142b, where an input end of the second switching tube 142a is connected to the MCU12, an input end of the fourth optocoupler 142b is connected to the second switching tube 142a, a first connection end of an output end is connected to a second phase of the three-phase power supply, a second connection end of an output end is connected to a first connection end of an input end of the first detection unit 112, when a phase sequence needs to be detected, the MCU12 controls the second switching tube 142a to be turned on, and further controls the fourth optocoupler 142b to be turned on, so as to control the second phase L2 to be turned on, and if the phase sequence needs to be stopped, the MCU12 controls the second switching tube 142a to be turned off, and further controls the fourth optocoupler 142b to be turned off, so as to control the second phase L2 to be stopped from being turned on; the third switch unit 143 includes a third switch tube 143a and a fifth optocoupler 143b, the input end of the third switch tube 143a is connected to the MCU12, the input end of the fifth optocoupler 143b is connected to the second switch tube 143a, the first connection end of the output end is connected to the third phase of the three-phase power supply, the second connection end of the output end is connected to the first connection end of the input end of the second detection unit 113, when the phase sequence needs to be detected, the MCU12 controls the third switch tube 143a to be turned on, and then controls the fifth optocoupler 143b to be turned on, so as to control the third phase L3 to be turned on, and if the phase sequence needs to be detected, the MCU12 controls the third switch tube 143a to be turned off, and then controls the fifth optocoupler 143b to be turned off, so as to control the third phase L3 to be turned off.
In order to prevent the device from being damaged and affecting the safety due to the excessive current input into the detection circuit, as shown in fig. 2, on the basis of the above embodiment, a first resistor R1 is connected between the first connection end of the output end of the third optocoupler 141b and the first phase L1 of the three-phase power supply 13; a second resistor R2 is connected between the first connection end of the output end of the fourth optocoupler 142b and the second phase L2 of the three-phase power supply 13; a third resistor R3 is connected between the first connection end of the output end of the fifth optocoupler 143b and the third phase L3 of the three-phase power supply 13, and the first resistor R1 and the second resistor R2 are current limiting resistors, and are used for limiting the current in the detection circuit.
Example 3
The embodiment provides a phase sequence detecting device, fig. 3 is a structural diagram of the phase sequence detecting device according to still another embodiment of the present invention, as shown in fig. 3: the phase sequence detection device consists of a resistor, a detection optocoupler and an MCU, wherein the resistor comprises a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1, the second resistor R2 and the third resistor R3 are limiting resistors, the optocoupler is prevented from being damaged by overlarge voltage, the power consumption is controlled, when the low power consumption is entered, the detection optocoupler is closed, the energy consumption of the limiting resistors is also broken, the circuit 0W loss is realized, and the detection optocoupler comprises: the voltage is limited through a first resistor R1, a second resistor R2 and a third resistor R3, the first optocoupler and the second optocoupler are respectively conducted, and an MCU collects the conducting time of the first optocoupler OC1 and the second optocoupler OC2 to judge whether the phase sequence is correct or not; most of the existing phase sequence detection circuits and phase sequence protection circuits are controlled by using relays, and the problems of power consumption, large circuit occupation space and the like are not solved.
Specifically, in the phase sequence detection device of the embodiment, three phase lines L1, L2 and L3 are respectively connected through three current limiting resistors of a first resistor R1, a second resistor R2 and a third resistor R3, wherein L1 and a zero line N are power supply lines of a main board of the unit, an independent detection loop is not needed, L2 is connected across the two ends of a first optocoupler through R2 and N, L3 is connected across the two ends of a second optocoupler through R3 and N, and an MCU detects whether the optocoupler is conducted or not and the conduction time difference to judge whether the phase sequence is normal or not. When the phase is out, the optocouplers are not conducted, when the phase is in reverse, the conduction time difference of the two optocouplers is wrong, and the specific principle of the phase sequence detection device is as follows:
Taking 50HZ alternating current input electricity as an example, taking L1 as a voltage reference point, when the phase sequence is normal, after L1 is positively conducted for 120 degrees, namely 7MS, L2 is positively conducted, so that a first optocoupler is conducted, an MCU detects that the level is changed from high to low, after 120 degrees are passed, L3 is positively conducted, a second optocoupler is conducted, the MCU detects that the level is changed from high to low, and whether the phase sequence is correct or not is judged through the sequence of the low levels of the two optocouplers and the arrival time difference of the low levels. When L2 or L3 phase failure occurs, the MCU can only detect one low level, and does not detect a second low level in the preset time interval 7MS, at this time, the MCU judges that the phase failure occurs, and when L1 phase failure occurs, the MCU indicates that the power supply lamp is not on because the MCU uses the first phase line L1 and the zero line N for power supply; when the reverse phase occurs, if the L2 reverse phase and the L3 reverse phase are detected, the waveform time sequences of the low levels are different, at the moment, the second optocoupler outputs the low level firstly, the first optocoupler outputs the low level, the two low levels differ by 7MS, and if the L1 reverse phase and the L2 reverse phase or the L1 reverse phase and the L3 reverse phase are detected by the MCU, the time intervals of the two low levels are not the preset time interval 7MS, but 14MS.
In addition, the phase sequence detection device of the embodiment further comprises a power consumption control module;
The power consumption control module consists of a resistor, a control optocoupler, a triode and an MCU, wherein the control optocoupler comprises a third optocoupler OC3, a fourth optocoupler OC4 and a fifth optocoupler OC5; the triode comprises a triode Q1, a triode Q2 and a triode Q3, three phase lines L1, L2 and L3 pass through a first resistor R1, a second resistor R2 and a third resistor R3, current is controlled within the range of maximum current born by the optocouplers, then the current returns to N through the output ends of the third optocoupler OC3, the fourth optocoupler OC4 and the fifth optocoupler OC5, and the MCU drives the triode to control the third optocoupler OC3, the fourth optocoupler OC4 and the fifth optocoupler OC5 to be turned off and on by judging whether the air conditioner is in a standby state or not, so that the three-phase electricity is turned off and on, and low power consumption is realized.
The principle of power consumption control is as follows: firstly judging whether the unit has operation requirements, if so, normally operating, otherwise, entering a sleep mode, wherein the low-power-consumption actions performed when entering the sleep mode not only comprise operations such as controlling all loads of a main board and an expansion board to be powered off, but also comprise operations such as not detecting phase sequence control, and particularly cutting off a phase sequence detection circuit to ensure power reduction. And when any indoor unit starting signal is received, the indoor unit exits from the sleep mode, load control and phase sequence detection are carried out again, and the process is repeated.
Compared with the prior art, the phase sequence detection device of the embodiment has the following characteristics:
1. The optocoupler is used as strong and weak electric isolation, and the current limiting resistors R1, R2 and R3 are arranged, so that the problem of overlarge current of the optocoupler is solved, the phase sequence detection function is realized, the low power consumption function is realized, the power consumption is greatly reduced in a standby state, and the problem of large standby power consumption can be solved;
2. Compared with the prior art, the optocoupler and triode control are used for greatly reducing the problem that components occupy a large area, reducing the design cost, and the optocoupler and triode control circuit has the advantages of strong practicability, high reliability and simple circuit design;
3. the MCU module is used for collecting analog signals of the optocouplers and processing the signals so as to judge whether the power supply lacks phases and is equal to the power supply in inverse phases, so that a phase sequence detection process is realized, the control is simple and efficient, and the control of whether the detection device is electrified or not can be realized through controlling the triodes Q1, Q2 and Q3, the third optocoupler OC3, the fourth optocoupler OC4 and the fifth optocoupler OC5, so that the energy consumption is reduced.
Example 4
The embodiment provides a phase sequence detection method, and fig. 4 is a flowchart of a phase sequence detection method according to an embodiment of the invention, as shown in fig. 4, where the method includes:
s101, after a first signal of a three-phase power supply is obtained, detecting a second signal and a third signal; the first signal is used for representing whether the first phase is conducted forward, the second signal is used for representing whether the second phase is conducted forward, and the third signal is used for representing whether the third phase is conducted forward;
in the implementation, after the first signal, the second signal and the third signal are detected and generated through an indicating unit, a first detecting unit and a second detecting unit respectively, wherein the first signal is connected between a first phase of the three-phase power supply and a zero line of the three-phase power supply and is used for indicating the forward conduction condition of the first phase; a first connecting end of the input end of the first detection unit is connected with a second phase of the three-phase power supply; the first connecting end of the input end of the second detection unit is connected with a third phase of the three-phase power supply; the second connecting end of the input end of the first detection unit is connected with the second connecting end of the input end of the second detection unit to form a connecting bus, the first end of the connecting bus is connected with the zero line of the three-phase power supply, and the second end of the connecting bus is connected with the first phase of the three-phase power supply through an indicating unit.
Specifically, the present invention relates to a method for manufacturing a semiconductor device; the first signal is generated when a first indicating element is lightened, wherein the anode of the first indicating element is connected with a first phase of the three-phase power supply, the cathode of the first indicating element is connected with a zero line of the three-phase power supply, and the first indicating element is lightened to indicate that the first phase of the three-phase power supply is positively conducted; the second signal is generated when the first optocoupler is in forward conduction and outputs a low level, wherein the anode of a diode at the input end of the first optocoupler is connected with the second phase of the three-phase power supply, the cathode of the diode is connected with the first phase of the three-phase power supply, the output end of the first optocoupler is connected with the MCU, and the MCU receives the second signal to indicate that the second phase of the three-phase power supply is in forward conduction; the third signal is generated when the second optocoupler is in forward conduction and outputs a low level, wherein the anode of a diode at the input end of the second optocoupler is connected with a third phase of the three-phase power supply, the cathode of the diode is connected with a first phase of the three-phase power supply, the output end of the second optocoupler is connected with the MCU, and the MCU receives the third signal to indicate that the third phase of the three-phase power supply is in forward conduction.
S102, judging whether the phase sequence of the three-phase power supply is normal, phase failure or reverse according to the time interval and sequence of the first signal, the second signal and the third signal.
For a three-phase power supply, the phase difference between each phase is 120 °, so under normal conditions, the interval time of forward conduction of the first phase, the second phase and the third phase should be equal and constant, and the conduction sequence is as follows: the first phase is conducted, the second phase is conducted, and the third phase is conducted, so that in order to realize accurate judgment of the phase sequence of the three-phase power supply, when the method is implemented, the normal phase sequence, the open phase sequence or the reverse phase of the three-phase power supply are judged according to the time interval and the sequence of the first signal, the second signal and the third signal, and the method comprises the following steps: judging whether a second signal is acquired after the preset time for acquiring the first signal; if so, the sequence and the interval time of the three phases are normal, so that the three-phase voltage phase sequence is judged to be normal; if not, the third phase is not conducted according to the preset interval time, and therefore the third phase loss of the three-phase power supply is judged.
If the second signal is not acquired after the preset time of acquiring the first signal and other signals are not acquired, the phase sequence is abnormal from the second phase, and the second signal or the third signal is acquired after the preset time is further judged; if a third signal is acquired, indicating that the sequence and time interval of the third signal are normal, and therefore judging that the second phase of the three-phase power supply is out of phase; if a second signal is obtained, it is stated that the phase of the second phase lags the first phase by 240 °, in other words that the second phase is 120 ° earlier than the first phase, thus determining the first phase and the second phase opposite phase of the three-phase power supply.
In a specific implementation process, in order to determine the sequential condition of each phase of the three-phase power supply, therefore, on the basis of the above embodiment, after determining the first phase and the second phase of the three-phase power supply, the method further includes: continuing to acquire a third signal; if the time when the third signal is acquired and the time when the second signal is acquired are spaced by twice the preset time, the second phase and the third phase reverse phase are judged, and the third phase is delayed by 240 degrees relative to the second phase, in other words, the third phase is advanced by 120 degrees relative to the second phase, so that the second phase and the third phase reverse phase are judged.
In the implementation process, since the third signal may be obtained after the preset time of the first signal is obtained, it is necessary to determine the situation again, and if the third signal is obtained after the preset time of the first signal is obtained and the second signal is detected after the preset time is further elapsed, the second phase and the third phase opposite of the three-phase power supply are determined.
In order to enable the conduction state of the detection circuit to be controllable, when the detection phase sequence is completed, the detection circuit can be controlled to be closed in time, and after the phase sequence of the three-phase power supply is judged to be normal, phase failure or reverse phase step is finished according to the time interval and sequence of the acquired first signal, the second signal and the third signal, the method further comprises: the first switch unit, the second switch unit and the third switch unit are controlled to be closed, and then the detection circuit is controlled to be closed; the input end of the first switch unit is connected with the MCU, and the output end of the first switch unit is connected with a first phase of the three-phase power supply; the input end of the second switch unit is connected with the MCU, and the output end of the second switch unit is connected with a second phase of the three-phase power supply; the input end of the third switch unit is connected with the MCU, the output end of the third switch unit is connected with a third phase of the three-phase power supply, and the purpose of reducing power consumption is achieved by timely closing a first phase, a second phase and the third phase of the three-phase power supply.
In order to achieve low power consumption control of the detection circuit, the method further comprises: judging whether the air conditioner has operation requirements or not; if so, controlling the first switch unit, the second switch unit and the third switch unit to be conducted so as to control the first phase of the three-phase power supply, the third phase of the three-phase power supply and the third phase of the three-phase power supply to be conducted; if not, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off so as to control the first phase of the three-phase power supply, the third phase of the three-phase power supply and the third phase of the three-phase power supply to be turned off.
According to the phase sequence detection method, the conduction condition of the three phases of the three-phase power supply is judged by detecting the first signal, the second signal and the third signal, and further whether the three-phase power supply is in open phase or reverse phase is judged.
Example 5
The embodiment provides air conditioning equipment, which comprises a three-phase power supply and the phase sequence detection device.
Example 6
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described method.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (17)
1. A phase sequence detection apparatus, the apparatus comprising: the detection circuit and the MCU; wherein,
The detection circuit includes:
The indication unit is connected between a first phase of the three-phase power supply and a zero line of the three-phase power supply and is used for indicating the conduction condition of the first phase; the indication unit comprises a first indication element and a second indication element which are connected in parallel in an opposite direction, wherein the anode of the first indication element is connected with a first phase of the three-phase power supply, the cathode of the first indication element is connected with a zero line of the three-phase power supply, the anode of the second indication element is connected with the zero line of the three-phase power supply, and the cathode of the second indication element is connected with the first phase of the three-phase power supply;
the first connecting end of the input end of the first detection unit is connected with the second phase of the three-phase power supply;
the first connecting end of the input end of the second detection unit is connected with a third phase of the three-phase power supply; the first end of the connecting bus is connected with a zero line of the three-phase power supply, and the second end of the connecting bus is connected with a first phase of the three-phase power supply through an indicating unit;
The input end of the MCU is respectively connected with the output ends of the first detection unit and the second detection unit, and the MCU is used for receiving detection signals of the first detection unit and the second detection unit so as to judge whether the phase sequence of the three-phase power supply is normal.
2. The apparatus of claim 1, wherein the device comprises a plurality of sensors,
The first detection unit is a first optocoupler, the anode of a diode at the input end of the first optocoupler is connected with the second phase of the three-phase power supply, the cathode of the diode at the input end of the first optocoupler is connected with the zero line of the three-phase power supply, the cathode of the diode at the input end of the first optocoupler is also connected with the first phase of the three-phase power supply through the indication unit, and the output end of the first optocoupler is connected with the MCU;
the second detection unit is a second optocoupler, the anode of a diode at the input end of the second optocoupler is connected with a third phase of the three-phase power supply, the cathode of the diode at the input end of the second optocoupler is connected with a zero line of the three-phase power supply, the cathode of the diode at the input end of the second optocoupler is also connected with a first phase of the three-phase power supply through the indication unit, and the output end of the second optocoupler is connected with the MCU.
3. The apparatus of claim 2, wherein the device comprises a plurality of sensors,
A first rectifying element is connected between a first connecting end and a second connecting end of the input end of the first optocoupler, and the direction of a diode of the first rectifying element is opposite to that of the input end of the first optocoupler; and/or the number of the groups of groups,
And a second rectifying element is connected between the first connecting end and the second connecting end of the input end of the second optocoupler, and the direction of the second rectifying element is opposite to that of a diode of the input end of the second optocoupler.
4. The apparatus of claim 1, wherein the apparatus further comprises:
a controllable switch module comprising:
the input end of the first switch unit is connected with the MCU, and the output end of the first switch unit is connected with a first phase of the three-phase power supply;
the input end of the second switch unit is connected with the MCU, and the output end of the second switch unit is connected with a second phase of the three-phase power supply;
and the input end of the third switch unit is connected with the MCU, and the output end of the third switch unit is connected with a third phase of the three-phase power supply.
5. The apparatus of claim 4, wherein the device comprises a plurality of sensors,
The first switch unit comprises a first switch tube and a third optical coupler, the input end of the first switch tube is connected with the MCU, the input end of the third optical coupler is connected with the output end of the first switch tube, the first connection end of the output end of the third optical coupler is connected with a first phase of the three-phase power supply, and the second connection end of the output end is connected with a zero line of the three-phase power supply through the indication unit; and/or the number of the groups of groups,
The second switch unit comprises a second switch tube and a fourth optical coupler, the input end of the second switch tube is connected with the MCU, the input end of the fourth optical coupler is connected with the output end of the second switch tube, the first connecting end of the output end of the fourth optical coupler is connected with the second phase of the three-phase power supply, and the second connecting end of the output end is connected with the first connecting end of the input end of the first detection unit; and/or the number of the groups of groups,
The third switch unit comprises a third switch tube and a fifth optical coupler, the input end of the third switch tube is connected with the MCU, the input end of the fifth optical coupler is connected with the output end of the third switch tube, the first connecting end of the output end of the fifth optical coupler is connected with the third phase of the three-phase power supply, and the second connecting end of the output end is connected with the first connecting end of the input end of the second detection unit.
6. The apparatus of claim 5, wherein a first resistor is connected between the first connection terminal of the third optocoupler output terminal and the first phase of the three-phase power supply; and/or a second resistor is connected between the first connecting end of the fourth optical coupler output end and the second phase of the three-phase power supply; and/or a third resistor is connected between the first connecting end of the fifth optocoupler output end and a third phase of the three-phase power supply.
7. An air conditioning apparatus comprising a three-phase power supply, characterized by further comprising the phase sequence detection device according to any one of claims 1 to 6.
8. A phase sequence detection method applied to the phase sequence detection device according to any one of claims 1 to 6, characterized in that the method comprises:
After the first signal of the three-phase power supply is obtained, detecting a second signal and a third signal; the first signal is used for representing whether the first phase is conducted forward, the second signal is used for representing whether the second phase is conducted forward, and the third signal is used for representing whether the third phase is conducted forward; the first phase forward conduction means that the current direction is from the first phase flow to a zero line of the three-phase power supply; the second phase forward conduction means that the current direction flows from the second phase to a zero line of a three-phase power supply; the third phase forward conduction means that the current direction flows from the third phase to a zero line of a three-phase power supply;
and judging whether the phase sequence of the three-phase power supply is normal, phase failure or reverse according to the time interval and sequence of the acquired first signal, the second signal and the third signal.
9. The method of claim 8, wherein determining whether the phase sequence of the three-phase power supply is normal, open-phase, or reverse-phase based on the time interval and sequence in which the first signal, the second signal, and the third signal are acquired, comprises:
Judging whether a second signal is acquired after the preset time for acquiring the first signal;
if so, judging whether the three-phase voltage is normal in phase sequence or is a third phase loss according to whether a third signal can be obtained after the preset time is further elapsed;
if not, judging whether the three-phase power supply is a second phase failure or a first phase and a second phase opposite phase according to the signals obtained after the preset time.
10. The method of claim 9, wherein if so, further determining whether the three-phase voltage is normal in phase sequence or is a third phase loss based on whether a third signal can be obtained after a predetermined time has elapsed, comprising:
judging whether a third signal is acquired after the preset time for acquiring the second signal;
if yes, judging that the three-phase voltage phase sequence is normal;
If not, judging that the third phase of the three-phase power supply is out of phase.
11. The method of claim 9, wherein if not, further determining that the three-phase power source is a second phase-missing phase or is a first phase and a second phase-inverted phase based on the signal obtained after the lapse of the preset time, comprising:
After judging that the preset time passes, acquiring a second signal or a third signal;
if the third signal is obtained, judging that the second phase of the three-phase power supply is out of phase;
and if the second signal is acquired, judging the first phase and the second phase opposite phases of the three-phase power supply.
12. The method of claim 11, wherein after determining the first phase and the second phase of the three-phase power supply, the method further comprises:
Continuing to acquire the third signal;
And if the interval between the time when the third signal is acquired and the time when the second signal is acquired is twice the preset time, judging the second phase and the third phase as the reverse phase.
13. The method of claim 8, wherein determining whether the phase sequence of the three-phase power supply is normal, open-phase, or reverse-phase based on the time interval and sequence in which the first signal, the second signal, and the third signal are acquired, further comprises:
And if the third signal is obtained after the preset time of the first signal is obtained and the second signal is detected after the preset time is further elapsed, judging the second phase and the third reverse phase of the three-phase power supply.
14. The method of claim 8, wherein the step of determining the position of the first electrode is performed,
The first signal is generated when a first indicating element is lightened, wherein the anode of the first indicating element is connected with a first phase of the three-phase power supply, and the cathode of the first indicating element is connected with a zero line of the three-phase power supply;
the second signal is generated when the first optocoupler is in forward conduction and outputs a low level, wherein the anode of a diode at the input end of the first optocoupler is connected with the second phase of the three-phase power supply, the cathode of the diode is connected with the first phase of the three-phase power supply, and the output end of the first optocoupler is connected with the MCU;
The third signal is generated when the second optocoupler is in forward conduction and outputs a low level, wherein the anode of a diode at the input end of the second optocoupler is connected with a third phase of the three-phase power supply, the cathode of the diode is connected with a first phase of the three-phase power supply, and the output end of the second optocoupler is connected with the MCU.
15. The method of claim 8, wherein after determining that the phase sequence of the three-phase power supply is normal, phase loss, or phase inversion according to the time interval and sequence in which the first signal, the second signal, and the third signal are acquired, the method further comprises:
The first switch unit, the second switch unit and the third switch unit are controlled to be turned off, and then the detection circuit is controlled to be turned off.
16. The method of claim 8, wherein the method further comprises:
Judging whether the air conditioner has operation requirements or not;
If so, controlling the first switch unit, the second switch unit and the third switch unit to be conducted so as to control the first phase of the three-phase power supply, the third phase of the three-phase power supply and the third phase of the three-phase power supply to be conducted;
If not, the first switch unit, the second switch unit and the third switch unit are controlled to be turned off so as to control the first phase of the three-phase power supply, the third phase of the three-phase power supply and the third phase of the three-phase power supply to be turned off.
17. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the method of any one of claims 8 to 16.
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| CN111521886B (en) * | 2020-04-28 | 2021-07-16 | 美的集团股份有限公司 | Phase-loss detection circuit and air conditioner |
| CN111577586B (en) * | 2020-05-15 | 2021-04-23 | 珠海格力电器股份有限公司 | Compressor, operation control method, device and system thereof and air conditioner |
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| CN110780126A (en) | 2020-02-11 |
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