CN115275961A - Three-phase power supply misconnection protection circuit and air conditioner - Google Patents
Three-phase power supply misconnection protection circuit and air conditioner Download PDFInfo
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- CN115275961A CN115275961A CN202210994022.9A CN202210994022A CN115275961A CN 115275961 A CN115275961 A CN 115275961A CN 202210994022 A CN202210994022 A CN 202210994022A CN 115275961 A CN115275961 A CN 115275961A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/004—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of incorrect phase sequence; with switching for obtaining correct phase sequence
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Abstract
The invention provides a three-phase power supply misconnection protection circuit and an air conditioner, and relates to the technical field of misconnection protection. The circuit comprises a main circuit switch, a power supply module, a half-wave rectification module, a driving module and a switching tube, wherein the power supply module is used for getting power from a second phase line and a third phase line and supplying power to the switching tube and the driving module; the half-wave rectification module is used for acquiring line voltages between the first phase line and the third phase line and between the second phase line and the third phase line so as to determine the electric connection state of the three-phase power supply line; when the three-phase power supply line is positively connected, the driving module drives the switching tube to be conducted so as to control the main circuit switch to be closed; when the three-phase power supply line is in wrong connection, the switching tube is cut off, and the main circuit switch is disconnected. The three-phase power supply misconnection protection circuit and the air conditioner have the advantage that the device controller is not damaged when misconnection occurs.
Description
Technical Field
The invention relates to the technical field of misconnection protection, in particular to a three-phase power supply misconnection protection circuit and an air conditioner.
Background
Most of the world currently supplies power in a single-phase power supply mode and a three-phase power supply mode. The three-phase power supply is adopted in China, and the three-phase power supply is generally in a three-phase four-wire system, namely four power wires, namely three live wires and one zero wire, are supplied to a user home.
When some consumer line, like the air conditioner line, can only connect three live wires when inserting the house power, however, because live wire and zero line need professional instrument just can discern, can appear wrong zero line as the condition that the live wire connects, wrong equipment power becomes two live wires and a zero line behind the zero line, can lead to equipment to lack the operation of looks under this kind of condition, causes the equipment controller to damage.
In conclusion, the problem that the device controller is damaged due to the fact that the live wire and the zero line are connected in a wrong mode exists in the prior art.
Disclosure of Invention
An object of this application is to provide a three-phase power supply misconnection protection circuit and air conditioner to solve the problem that exists among the prior art misconnects live wire and zero line, leads to equipment controller damage.
In order to solve the problems, the following technical scheme is adopted in the application:
on one hand, the embodiment of the application provides a three-phase power supply misconnection protection circuit, the circuit includes a main circuit switch, a power module, a half-wave rectification module, a driving module and a switch tube, the main circuit switch is respectively electrically connected with at least two phase lines in a three-phase power supply line, the three-phase power supply line includes a first phase line, a second phase line and a third phase line, the main circuit switch is further electrically connected with the switch tube and the third phase line, the power module is respectively electrically connected with the second phase line, the third phase line, the switch tube and the driving module, the driving module is further electrically connected with a control end of the switch tube, and the half-wave rectification module is respectively electrically connected with the first phase line, the second phase line, the third phase line and the driving module; wherein the content of the first and second substances,
the power supply module is used for getting power from the second phase line and the third phase line and supplying power to the switching tube and the driving module;
the half-wave rectification module is used for acquiring line voltages between the first phase line and the third phase line and between the second phase line and the third phase line so as to determine the electric connection state of the three-phase power supply circuit;
when the three-phase power supply line is connected positively, the driving module drives the switching tube to be conducted so as to control the main circuit switch to be closed;
when the three-phase power supply line is in misconnection, the switch tube is cut off, and the main circuit switch is disconnected.
In the three-phase power supply misconnection protection circuit provided by the application, the line voltages between the first phase line and the third phase line and between the second phase line and the third phase line can be obtained by arranging the half-wave rectification module so as to determine the electric connection state of the three-phase power supply line, and when the three-phase power supply line is in positive connection, the driving module drives the switching tube to be conducted so as to control the main circuit switch to be closed; and when the three-phase power supply line misconnection, the switch tube is cut off, and the main circuit switch is disconnected, so when misconnection appears, equipment can't normally work, and then guaranteed that equipment can not move under the open-phase condition, guaranteed that the equipment controller can not damage.
Optionally, the half-wave rectification module includes a first half-wave rectification module, a second half-wave rectification module and a first resistor, the first half-wave rectification module is respectively electrically connected with the second phase line and the third phase line, the second half-wave rectification module is respectively electrically connected with the first phase line and the third phase line, the first half-wave rectification module, the second half-wave rectification module and one end of the first resistor are electrically connected to a common node, the common node is further electrically connected to the driving module, and the other end of the first resistor is further electrically connected to the third phase line.
Optionally, the first half-wave rectification module includes a first diode, a first capacitor, and a second resistor, an anode of the first diode is electrically connected to the second phase line, a cathode of the first diode is electrically connected to one end of the first capacitor and one end of the second resistor, respectively, the other end of the first capacitor is electrically connected to the third phase line, and the other end of the second resistor is electrically connected to the common node;
the second half-wave rectification module comprises a second diode, a second capacitor and a third resistor, wherein the anode of the second diode is electrically connected with the first phase line, the cathode of the second diode is respectively electrically connected with the second capacitor and one end of the third resistor, the other end of the second capacitor is electrically connected with the third phase line, and the other end of the third resistor is electrically connected with the common node.
Optionally, the voltage of the common node satisfies the formula:
where Vs3 represents the voltage of the common node, vs1 represents the voltage of one terminal of the second resistor, vs2 represents the voltage of one terminal of the third resistor, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, and R3 represents the resistance value of the third resistor.
Optionally, the driving module includes a fourth resistor, a fifth resistor, and a controllable precise voltage regulator, one end of the fourth resistor connected in series with the fifth resistor is electrically connected to the power module, the other end of the fourth resistor is electrically connected to a cathode of the controllable precise voltage regulator, a control end of the switching tube is electrically connected between the fourth resistor and the fifth resistor, a reference electrode of the controllable precise voltage regulator is electrically connected to the half-wave rectification module, and an anode of the controllable precise voltage regulator is electrically connected to the third phase line.
Optionally, the power module includes a third capacitor, a third diode, an electrolytic capacitor, and a voltage regulator tube, one end of the third capacitor is electrically connected to the second phase line, the other end of the third capacitor is electrically connected to an anode of the third diode, a cathode of the third diode is respectively electrically connected to the first end of the switch tube, an anode of the electrolytic capacitor, and a cathode of the voltage regulator tube, and a cathode of the electrolytic capacitor and an anode of the voltage regulator tube are both electrically connected to the third phase line.
Optionally, the power supply module further includes a fourth diode, a cathode of the fourth diode is electrically connected between the third capacitor and the third diode, and an anode of the fourth diode is electrically connected to the third phase line.
Optionally, the switching tube includes a PNP transistor, an emitter of the transistor is electrically connected to the power module, a base of the transistor is electrically connected to the driving module, and a collector of the transistor is electrically connected to the main circuit switch.
Optionally, the main circuit switch includes a relay, the relay includes a coil and a contact switch, the contact switch is electrically connected to at least two phase lines in a three-phase power supply line, and the coil is electrically connected to the switching tube and the third phase line, respectively; wherein, the first and the second end of the pipe are connected with each other,
when the switch tube is conducted, the contact switch is closed;
when the switch tube is cut off, the contact switch is disconnected.
In a second aspect, an embodiment of the present application further provides an air conditioner, where the air conditioner includes the three-phase power supply misconnection protection circuit.
Drawings
Fig. 1 is a block diagram of a three-phase power supply misconnection protection circuit according to an embodiment of the present disclosure.
Fig. 2 is a circuit schematic diagram of a three-phase power supply misconnection protection circuit according to an embodiment of the present application.
Description of reference numerals:
100-three-phase power supply misconnection protection circuit; 110-main path switch; 120-a power module; 130-half-wave rectification module; 140-a drive module; 150-switching tube.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Just as in the background art, only three live wires can be connected when the three-phase power supply air conditioner is connected to the household power supply, and in the actual after-sale installation process, because the live wire and the zero line can be identified by professional instruments, the condition that the zero line is connected as the live wire in a wrong way can occur, and the air conditioner power supply is changed into two live wires and one zero line after the zero line is connected in a wrong way, so that the air conditioner runs in a phase-lacking manner under the condition, and the air conditioner controller is damaged.
In view of this, the embodiment of the present application provides a three-phase power supply misconnection protection circuit, and through a mode that when a three-phase power supply line misconnects, a control device cannot supply power, and only when the control device is in a positive connection, the device can normally supply power, so that a situation that a device controller is damaged due to operation of the device under a phase-lacking condition is avoided.
The following provides an exemplary description of the three-phase power supply misconnection protection circuit provided by the present application:
as an optional implementation manner, please refer to fig. 1, the three-phase power supply misconnection protection circuit 100 includes a main switch 110, a power module 120, a half-wave rectification module 130, a driving module 140 and a switching tube 150, where the main switch 110 is electrically connected to at least two phase lines of a three-phase power supply line, the three-phase power supply line includes a first phase line, a second phase line and a third phase line, the main switch 110 is further electrically connected to the switching tube 150 and the third phase line, the power module 120 is electrically connected to the second phase line, the third phase line, the switching tube 150 and the driving module 140, the driving module 140 is further electrically connected to a control end of the switching tube 150, and the half-wave rectification module 130 is electrically connected to the first phase line, the second phase line, the third phase line and the driving module 140; the power module 120 is configured to obtain power from the second phase line and the third phase line, and supply power to the switching tube 150 and the driving module 140; the half-wave rectification module 130 is configured to obtain line voltages between the first phase line and the third phase line, and between the second phase line and the third phase line, so as to determine an electrical connection state of the three-phase power supply line; when the three-phase power supply line is connected positively, the driving module 140 drives the switching tube 150 to be conducted so as to control the main circuit switch 110 to be closed; when the three-phase power supply line is misconnected, the switching tube 150 is cut off, and the main switch 110 is disconnected.
It can be understood that the three-phase power supply misconnection protection circuit 100 provided in the present application can obtain power from the three-phase power supply line through the power module 120 to supply power to the switching tube 150 and the driving module 140, so that no additional power is required. Moreover, the three-phase power supply misconnection protection circuit 100 provided by the application has a simple and reliable circuit structure, does not need AD conversion and independent chip logic judgment for a sampling signal, and is high in response speed.
Referring to fig. 2, as an implementation manner, the switching tube 150 provided by the present application adopts a triode, and the main circuit switch 110 includes a relay, but naturally, in other implementation manners, other devices may also be adopted, for example, the switching tube 150 may also adopt a MOS tube, an IGBT tube, and the like. When the switch tube 150 is a triode, the switch tube 150 may be a PNP triode, an emitter of the triode is electrically connected to the power module 120, a base of the triode is electrically connected to the driving module 140, and a collector of the triode is electrically connected to the main switch 110.
In addition, in the main circuit switch 110, the relay includes a coil and a contact switch, the contact switch is electrically connected to at least two phase lines of the three-phase power supply line, for example, the contact switch is electrically connected to only the second phase line and the third phase line, of course, the contact switch may also be electrically connected to the first phase line, the second phase line and the third phase line, and the coil is electrically connected to the switching tube 150 and the third phase line respectively; when the switch tube 150 is turned on, the contact switch is turned on, and when the switch tube 150 is turned off, the contact switch is turned off.
On this basis, it can be understood that the working principle of the misconnection protection of the present application is as follows: the driving module 140 controls the on and off of the triode, and further controls the attraction and disconnection of the three-phase power supply controller relay, so that the protection of the three-phase load is realized, and the specific principle is as follows:
1. when the three-phase load input power supply is respectively connected with the first phase line, the second phase line and the third phase line, the triode is conducted, the relay is closed, and the three-phase power supply load is electrified and works normally;
2. when one of the first phase line, the second phase line and the third phase line of the three-phase load input power supply is mistakenly connected with the zero line, the triode is not conducted, the relay is not attracted, the three-phase power supply load is not powered, and therefore the fact that the load end equipment cannot work under the condition of mistaken connection is guaranteed, and the effect of protecting the equipment controller is achieved.
Optionally, the half-wave rectification module 130 includes a first half-wave rectification module, a second half-wave rectification module, and a first resistor, the first half-wave rectification module is electrically connected to the second phase line and the third phase line, the second half-wave rectification module is electrically connected to the first phase line and the third phase line, one end of each of the first half-wave rectification module, the second half-wave rectification module, and the first resistor is electrically connected to a common node, the common node is further electrically connected to the driving module 140, and the other end of the first resistor is further electrically connected to the third phase line.
The first half-wave rectification module comprises a first diode, a first capacitor and a second resistor, wherein the anode of the first diode is electrically connected with the second phase line, the cathode of the first diode is respectively electrically connected with one ends of the first capacitor and the second resistor, the other end of the first capacitor is electrically connected with the third phase line, and the other end of the second resistor is electrically connected with the common node;
the second half-wave rectification module comprises a second diode, a second capacitor and a third resistor, wherein the anode of the second diode is electrically connected with the first phase line, the cathode of the second diode is respectively electrically connected with one end of the second capacitor and one end of the third resistor, the other end of the second capacitor is electrically connected with the third phase line, and the other end of the third resistor is electrically connected with the common node.
It is understood that the first diode and the first capacitor perform half-wave rectification of the line voltages of the second phase line and the third phase line, the second diode and the second capacitor perform half-wave rectification of the line voltages of the first phase line and the third phase line,
under normal conditions, the effective value Vin =380V of the voltage among the three phase lines, the frequency is 50Hz, the voltage is converted into direct-current voltage after half-wave rectification, and the voltage is as follows:
when the first phase line, the second phase line and the third phase line are normally connected, the voltage of one end of the second resistor and the voltage of one end of the third resistor meet the formula:
furthermore, from kirchhoff's current law:
where Vs3 denotes a voltage of the common node, vs1 denotes a voltage of one terminal of the second resistor, vs2 denotes a voltage of one terminal of the third resistor, R1 denotes a resistance value of the first resistor, R2 denotes a resistance value of the second resistor, and R3 denotes a resistance value of the third resistor.
Based on the above formula, the voltage of the common node satisfies the formula:
according to the formula, under the condition that the resistance values of the first resistor, the second resistor and the third resistor are fixed, if a wrong junction occurs in a three-phase power supply line, the voltage of the common node is changed. Meanwhile, the common node is also electrically connected with the driving module 140, so that when the voltage of the common node changes, the conduction state of the driving module 140 changes, and further the on-off state of the triode changes, and finally the on-off state of the relay is influenced.
As an optional implementation manner, the driving module 140 includes a fourth resistor, a fifth resistor, and a controllable precise voltage regulator, one end of the fourth resistor connected in series with the fifth resistor is electrically connected to the power module 120, the other end of the fourth resistor is electrically connected to a cathode of the controllable precise voltage regulator, a control end of the switching tube 150 is electrically connected between the fourth resistor and the fifth resistor, a reference electrode of the controllable precise voltage regulator is electrically connected to the half-wave rectification module 130, and an anode of the controllable precise voltage regulator is electrically connected to the third phase line.
Namely, the reference voltage of the control precision voltage-stabilizing source is equal to the voltage of the common node, thereby influencing the on-off state of the control precision voltage-stabilizing source. For example, the model of the precision control voltage regulator provided by the application selects TL431, and the conduction threshold value is 2.5V, that is, when the voltage of the reference electrode is greater than 2.5V, the reference electrode is turned on, and when the voltage of the reference electrode is less than 2.5V, the reference electrode is turned off.
In order to ensure that the TL431 cathode and the TL431 anode can be completely switched on/off, the resistances of the first resistor, the second resistor and the third resistor are reasonably selected, so that when the first phase line, the second phase line and the third phase line are correctly connected, vs3 is more than 2.5V, and the relay is attracted; and when any one of the first phase line, the second phase line and the third phase line is mistakenly connected with the zero line, the relay with the voltage Vs3 less than 2.5V is not attracted.
As an implementation manner, the power module 120 includes a third capacitor, a third diode, an electrolytic capacitor, and a voltage regulator tube, one end of the third capacitor is electrically connected to the second phase line, the other end of the third capacitor is electrically connected to an anode of the third diode, a cathode of the third diode is respectively connected to the first end of the switch tube 150, an anode of the electrolytic capacitor, and a cathode of the voltage regulator tube, and a cathode of the electrolytic capacitor and an anode of the voltage regulator tube are both electrically connected to the third phase line.
The power module 120 comprises a 380V/50Hz alternating current composed of a second phase line and a third phase line, a third capacitor for voltage reduction, a third diode for half-wave rectification, and an electrolytic capacitor and a voltage regulator tube for voltage regulation to obtain a power supply, wherein the voltage regulator tube adopts a 12V voltage regulator tube, so that a 12V power supply can be obtained, and the power supply is used as a relay coil power supply and a triode base signal power supply; the power module 120 further includes a fourth diode, a cathode of the fourth diode is electrically connected between the third capacitor and the third diode, and an anode of the fourth diode is electrically connected to the third phase line. The fourth diode is used for providing a discharge path for the third capacitor when the line voltage of the second phase line and the third phase line is in a negative half cycle.
Combining the driving module 140, the 12V power is divided by the fourth resistor and the fifth resistor and then output as the base signal of the triode, and the signal is controlled by the controllable precision voltage regulator, and according to the characteristics of the controllable precision voltage regulator:
when the reference voltage Vs3 of the controllable precise voltage-stabilizing source is more than 2.5V, the cathode and the anode are conducted, the partial pressure signals of the fourth resistor and the fifth resistor are input into the base electrode of the triode, and the emitting electrode of the triode is reversely biased, so that the triode is conducted, the coil of the relay is electrified and attracted, and the three-phase power supply load is electrified;
when the reference voltage Vs3 of the controllable precise voltage-stabilizing source is less than 2.5V, the cathode and the anode are in a high-resistance disconnection state, the emitting electrode of the triode is zero-offset, the triode is cut off, the coil of the relay is not electrified and is not attracted, and the three-phase power supply load is not electrified.
The following explains the principle of the three-phase power supply misconnection protection circuit 100 provided by the present application, taking the resistance of the first resistor =18K Ω, and the resistances of the second resistor and the third resistor are 7000K Ω as an example:
when the first phase line, the second phase line and the third phase line are correctly wired:
from equation 1:
from equation 2:
and 2.7V is more than 2.5V,
therefore, the relay is closed, and the load works normally.
(2) When the first phase line in the wrong wiring is connected with the zero line, and the second phase line and the third phase line are correctly connected:
the phase voltage between L1 and L3 is changed from 380V to 220V,
the equation 2 calculates that Vs3=2.17V < 2.5V, the relay is not closed, and the load does not work.
(3) When the wrong wiring third phase line is connected with the zero line and the second phase line is correctly connected with the first phase line:
at this time
The equation 2 calculates that Vs3=1.59V < 2.5V, the relay is not attracted, and the load does not work.
(4) When the second phase line of the wrong wiring is connected with the zero line and the third phase line is correctly connected with the first phase line:
the phase voltage between L2 and L3 is changed from 380V to 220V,
the equation 2 calculates that Vs3=2.17V < 2.5V, the relay is not attracted, and the load does not work.
It is thus clear that in all possible connection modes described above, a three-phase load can be protected against electrical faults when connecting the wrong line.
Of course, when different controllable precision voltage regulators are used, the conduction threshold may be different, for example, the conduction threshold of a certain type of controllable precision voltage regulator may be 3.5V, and then the resistance values of the first resistor, the second resistor, and the third resistor may be adjusted accordingly.
In summary, the present application provides a three-phase power supply misconnection protection circuit 100, which includes a main circuit switch 110, a power module 120, a half-wave rectification module 130, a driving module 140 and a switching tube 150, wherein the main circuit switch 110 is electrically connected to at least two phase lines of a three-phase power supply line respectively, the three-phase power supply line includes a first phase line, a second phase line and a third phase line, the main circuit switch 110 is further electrically connected to the switching tube 150 and the third phase line, the power module 120 is electrically connected to the second phase line, the third phase line, the switching tube 150 and the driving module 140 respectively, the driving module 140 is further electrically connected to a control terminal of the switching tube 150, and the half-wave rectification module 130 is electrically connected to the first phase line, the second phase line, the third phase line and the driving module 140 respectively; the power module 120 is configured to obtain power from the second phase line and the third phase line, and supply power to the switching tube 150 and the driving module 140; the half-wave rectification module 130 is configured to obtain line voltages between the first phase line and the third phase line, and between the second phase line and the third phase line, so as to determine an electrical connection state of the three-phase power supply line; when the three-phase power supply line is connected positively, the driving module 140 drives the switching tube 150 to be conducted so as to control the main circuit switch 110 to be closed; when the three-phase power supply line is misconnected, the switching tube 150 is cut off, and the main switch 110 is disconnected. In the three-phase power supply misconnection protection circuit 100 provided by the present application, the line voltages between the first phase line and the third phase line, and between the second phase line and the third phase line can be obtained by setting the half-wave rectification module 130, so as to determine the electrical connection state of the three-phase power supply line, and when the three-phase power supply line is in positive connection, the driving module 140 drives the switching tube 150 to be conducted, so as to control the main switch 110 to be closed; when the three-phase power supply line is in wrong connection, the switching tube 150 is cut off, and the main switch 110 is switched off, so that when the wrong connection occurs, the equipment cannot normally work, the equipment cannot run under the condition of phase failure, and the equipment controller cannot be damaged.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A three-phase power supply misconnection protection circuit (100) is characterized by comprising a main circuit switch (110), a power module (120), a half-wave rectification module (130), a driving module (140) and a switching tube (150), wherein the main circuit switch (110) is respectively and electrically connected with at least two phase lines in a three-phase power supply line, the three-phase power supply line comprises a first phase line, a second phase line and a third phase line, the main circuit switch (110) is also electrically connected with the switching tube (150) and the third phase line, the power module (120) is respectively and electrically connected with the second phase line, the third phase line, the switching tube (150) and the driving module (140), the driving module (140) is also electrically connected with a control end of the switching tube (150), and the half-wave rectification module (130) is respectively and electrically connected with the first phase line, the second phase line, the third phase line and the driving module (140); wherein the content of the first and second substances,
the power supply module (120) is used for getting electricity from the second phase line and the third phase line and supplying power to the switching tube (150) and the driving module (140);
the half-wave rectification module (130) is used for acquiring line voltages between the first phase line and the third phase line and between the second phase line and the third phase line so as to determine the electric connection state of the three-phase power supply line;
when the three-phase power supply line is positively connected, the driving module (140) drives the switching tube (150) to be conducted so as to control the main circuit switch (110) to be closed;
when the three-phase power supply line is in fault connection, the switch tube (150) is cut off, and the main circuit switch (110) is disconnected.
2. The three-phase power supply misconnection protection circuit (100) of claim 1, wherein the half-wave rectification module (130) comprises a first half-wave rectification module (130), a second half-wave rectification module (130) and a first resistor, the first half-wave rectification module (130) is electrically connected to the second phase line and the third phase line respectively, the second half-wave rectification module (130) is electrically connected to the first phase line and the third phase line respectively, one end of the first half-wave rectification module (130), one end of the second half-wave rectification module (130) and one end of the first resistor are electrically connected to a common node, the common node is further electrically connected to the driving module (140), and the other end of the first resistor is further electrically connected to the third phase line.
3. The three-phase power supply misconnection protection circuit (100) according to claim 2, wherein the first half-wave rectification module (130) comprises a first diode, a first capacitor, and a second resistor, wherein an anode of the first diode is electrically connected to the second phase line, a cathode of the first diode is electrically connected to one end of the first capacitor and one end of the second resistor, respectively, another end of the first capacitor is electrically connected to the third phase line, and another end of the second resistor is electrically connected to the common node;
the second half-wave rectification module (130) comprises a second diode, a second capacitor and a third resistor, wherein the anode of the second diode is electrically connected with the first phase line, the cathode of the second diode is respectively electrically connected with the second capacitor and one end of the third resistor, the other end of the second capacitor is electrically connected with the third phase line, and the other end of the third resistor is electrically connected with the common node.
4. The three-phase power supply misconnection protection circuit (100) of claim 3, wherein the voltage at the common node satisfies the formula:
where Vs3 denotes a voltage of the common node, vs1 denotes a voltage of one terminal of the second resistor, vs2 denotes a voltage of one terminal of the third resistor, R1 denotes a resistance value of the first resistor, R2 denotes a resistance value of the second resistor, and R3 denotes a resistance value of the third resistor.
5. The three-phase power supply misconnection protection circuit (100) according to claim 1, wherein the driving module (140) comprises a fourth resistor, a fifth resistor and a controllable precise voltage-stabilizing source, one end of the fourth resistor and the fifth resistor after being connected in series is electrically connected with the power module (120), the other end of the fourth resistor and the fifth resistor is electrically connected with the cathode of the controllable precise voltage-stabilizing source, the control end of the switching tube (150) is electrically connected between the fourth resistor and the fifth resistor, the reference electrode of the controllable precise voltage-stabilizing source is electrically connected with the half-wave rectification module (130), and the anode of the controllable precise voltage-stabilizing source is electrically connected with the third phase line.
6. The three-phase power supply misconnection protection circuit (100) according to claim 1, wherein the power module (120) comprises a third capacitor, a third diode, an electrolytic capacitor and a voltage regulator tube, one end of the third capacitor is electrically connected to the second phase line, the other end of the third capacitor is electrically connected to an anode of the third diode, a cathode of the third diode is respectively connected to the first end of the switch tube (150), an anode of the electrolytic capacitor and a cathode of the voltage regulator tube, and a cathode of the electrolytic capacitor and an anode of the voltage regulator tube are both electrically connected to the third phase line.
7. The three-phase power supply misconnection protection circuit (100) of claim 6, wherein the power module (120) further comprises a fourth diode, a cathode of the fourth diode is electrically connected between the third capacitor and the third diode, and an anode of the fourth diode is electrically connected to the third phase line.
8. The three-phase power supply misconnection protection circuit (100) of claim 1, wherein the switching transistor (150) comprises a PNP transistor, an emitter of the transistor is electrically connected to the power module (120), a base of the transistor is electrically connected to the driving module (140), and a collector of the transistor is electrically connected to the main switch (110).
9. The three-phase power misconnection protection circuit (100) of claim 1, wherein the main circuit switch (110) comprises a relay comprising a coil and a contact switch, the contact switch being electrically connected to at least two phases of a three-phase power supply line, the coil being electrically connected to the switching tube (150) and the third phase, respectively; wherein the content of the first and second substances,
when the switch tube (150) is conducted, the contact switch is closed;
when the switch tube (150) is cut off, the contact switch is opened.
10. An air conditioner, characterized in that it comprises a three-phase supply misconnection protection circuit (100) according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994022.9A CN115275961A (en) | 2022-08-18 | 2022-08-18 | Three-phase power supply misconnection protection circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210994022.9A CN115275961A (en) | 2022-08-18 | 2022-08-18 | Three-phase power supply misconnection protection circuit and air conditioner |
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