Air conditioning unit voltage abnormity detection alarm circuit

Abstract

The invention discloses an air conditioning unit voltage abnormity detection alarm circuit, and relates to the technical field of air conditioning unit detection, and the circuit comprises an air conditioning unit control module which is used for carrying out rectification and three-phase inversion on AC electric energy and controlling an air conditioning unit to work; the central module is used for signal receiving and module control; the three-phase isolation detection module is used for isolating three-phase voltage detection; the first change control module is used for performing phase shift processing on the signal output by the three-phase isolation detection module; the second change control module is used for performing phase shift processing; the voltage comparison module is used for carrying out voltage comparison on the first change control module, the second change detection module and the three-phase isolation detection module; the first alarm module and the second alarm module are both used for voltage abnormity alarm; and the data transmission module is used for data transmission. The air conditioning unit voltage abnormity detection alarm circuit can timely and effectively judge whether the voltage fails or not and reduce the energy consumption and the data processing amount of the central module.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning unit detection, in particular to an abnormal voltage detection alarm circuit for an air conditioning unit. Background Art

[0002] The air conditioning unit is a centralized air handling system, which originated from a centralized equipment setting. It is a forced hot air heating and ventilation system that distributes heated air through air ducts and is powered by three-phase electricity. In order to avoid three-phase imbalance or phase failure, the air conditioning unit in the prior art generally uses an isolated voltage detection circuit composed of a photocoupler to perform isolated voltage detection on the three-phase electricity, which is received by a microcontroller and determined through a set software program. The microcontroller needs to receive the sampled voltage data at all times and make abnormal judgments on the voltage data, so that the microcontroller needs to process more data and the processing means are more complicated. In addition, the microcontroller cannot quickly detect the voltage state of the three-phase electricity at the same time, resulting in the inability to timely determine whether the voltage is faulty. Therefore, there is room for improvement. Summary of the invention

[0003] The embodiment of the present invention provides an abnormal voltage detection alarm circuit for an air-conditioning unit to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, there is provided an air conditioning unit voltage anomaly detection alarm circuit, comprising: an air conditioning unit control module, a central module, a three-phase isolation detection module, a first change control module, a second change control module, a voltage comparison module, a first alarm module, a second alarm module and a data transmission module;

[0005] The air conditioning unit control module is connected to the central module and is used to receive and rectify the AC power. When receiving the first pulse signal output by the central module, the rectified power is subjected to three-phase inversion and output three-phase power to control the operation of the air conditioning unit.

[0006] The central module is connected to the data transmission module, the first change control module and the second change control module, and is used to output a first pulse signal, output a second pulse signal and a third pulse signal according to the phase value of the three-phase electric energy, and respectively control the phase shifting operation of the first change control module and the second change control module, and receive the first detection signal, the second detection signal and the third detection signal transmitted by the data transmission module;

[0007] A three-phase isolation detection module, connected to the air conditioning unit control module, for performing isolation voltage detection on the three-phase electric energy and outputting a first detection signal, a second detection signal and a third detection signal respectively, performing voltage drop processing on the second detection signal and outputting a first voltage signal;

[0008] A first change control module is connected to the three-phase isolation detection module and is used to perform phase shift processing on the first detection signal and output a second voltage signal when receiving the second pulse signal;

[0009] A second change control module is connected to the three-phase isolation detection module and is used to perform phase shift processing on the third detection signal and output a third voltage signal when receiving a third pulse signal;

[0010] a voltage comparison module, connected to the first change control module, the second change control module and the three-phase isolation detection module, and configured to perform voltage comparison processing on the first voltage signal and the second voltage signal and output a first level signal, perform voltage comparison processing on the third voltage signal and the second voltage signal and output a second level signal, and perform voltage comparison processing on the first voltage signal and the third voltage signal and output a third level signal;

[0011] A first alarm module, connected to the voltage comparison module, for receiving the first level signal, the second level signal and the third level signal and performing an alarm when the first level signal, the second level signal or the third level signal is in a high level state;

[0012] A second alarm module is connected to the voltage comparison module, and is used to invert the first level signal, the second level signal and the third level signal, and to perform an alarm when the inverted first level signal, the inverted second level signal or the inverted third level signal is in a high level state;

[0013] The data transmission module is connected to the three-phase isolation detection module, the first alarm module and the second alarm module, and is used to transmit the first detection signal, the second detection signal and the third detection signal to the central module when receiving the first level signal, the second level signal, the third level signal, the inverted first voltage signal, the inverted second level signal or the inverted third level signal in a high level state.

[0014] As a further solution of the present invention: the air conditioning unit control module includes a power access port, a full-wave rectifier, a three-phase inverter and an air conditioning fan; the central module includes a first processor;

[0015] Preferably, the first end and the second end of the power access port are respectively connected to the first end and the second end of the full-wave rectifier, the third end and the fourth end of the full-wave rectifier are respectively connected to the first input end and the second input end of the three-phase inverter, the first output end, the second output end and the third output end of the three-phase inverter are respectively connected to the first end, the second end and the third end of the air-conditioning fan, and the control end of the three-phase inverter is connected to the IO1 end of the first processor.

[0016] As a further solution of the present invention: the three-phase isolation detection module includes a first fuse, a thirteenth diode, a first coupler, a first resistor, a first DC source, a first detection device, a second detection device, a second diode and a third diode;

[0017] Preferably, the IN1 end of the first coupler is connected to the cathode of the thirteenth diode and is connected to the first output end of the three-phase inverter through the first fuse, the first end of the first detection device is connected to the second output end of the three-phase inverter, the first end of the second detection device is connected to the third output end of the three-phase inverter, the IN2 end of the first coupler is connected to the anode of the thirteenth diode, the second end of the first detection device, the second end of the second detection device and the second input end of the three-phase inverter, the third end of the first detection device, the third end of the second detection device and the VCC end of the first coupler are all connected to the first DC source, the OUT end of the first coupler is connected to the first change control module and is grounded through the first resistor, the fourth end of the first detection device is connected to the anode of the second diode and the anode of the third diode, the cathode of the second diode and the cathode of the third diode are connected to the voltage comparison module, and the fourth end of the second detection device is connected to the second change control module.

[0018] As a further solution of the present invention: the first change control module includes a second resistor, a third resistor, a fourth resistor, a first capacitor, a first operational amplifier, a first field effect transistor and a first diode;

[0019] Preferably, the drain of the first field effect transistor is connected to one end of the third resistor and the OUT end of the first coupler through the second resistor, the source of the first field effect transistor is connected to the in-phase end of the first operational amplifier and grounded through the first capacitor, the inverting end of the first operational amplifier is connected to the other end of the third resistor and connected to the output end of the first operational amplifier and the anode of the first diode through the fourth resistor, the cathode of the first diode is connected to the voltage comparison module, and the gate of the first field effect transistor is connected to the IO5 end of the first processor.

[0020] As a further solution of the present invention: the second change control module includes a fifth resistor, a second capacitor, a sixth resistor, a seventh resistor, a second field effect transistor, a second operational amplifier and a fourth diode;

[0021] Preferably, the in-phase end of the second operational amplifier is connected to one end of the seventh resistor and to one end of the second capacitor through a fifth resistor and to the fourth end of the second detection device, the inverting end of the second operational amplifier is connected to the other end of the second capacitor and to the drain of the second field effect transistor through a sixth resistor, the source of the second field effect transistor is grounded, the output end of the second operational amplifier is connected to the other end of the seventh resistor and to the anode of the fourth diode, the cathode of the fourth diode is connected to the voltage comparison module, and the gate of the second field effect transistor is connected to the IO6 end of the first processor.

[0022] As a further solution of the present invention: the voltage comparison module includes a first comparison device, a second comparison device and a third comparison device;

[0023] Preferably, the in-phase end of the first comparison device is connected to the inverting end of the third comparison device and the cathode of the first diode, the inverting end of the first comparison device and the inverting end of the second comparison device are respectively connected to the cathode of the second diode and the cathode of the third diode, the in-phase end of the second comparison device is connected to the in-phase end of the third comparison device and the cathode of the fourth diode, and the output end of the first comparison device, the output end of the second comparison device and the output end of the third comparison device are connected to the first alarm module and the second alarm module.

[0024] As a further solution of the present invention: the first alarm module includes a fifth diode, a sixth diode, a seventh diode, an eighth resistor, a first triode, a first alarm device and a second DC source;

[0025] Preferably, the anode of the fifth diode, the anode of the sixth diode and the anode of the seventh diode are respectively connected to the output end of the first comparison device, the output end of the second comparison device and the output end of the third comparison device, the cathode of the fifth diode is connected to the cathode of the sixth diode and the cathode of the seventh diode and is connected to the base of the first transistor through the eighth resistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected to one end of the first alarm device, and the other end of the first alarm device is connected to the second DC source.

[0026] As a further solution of the present invention: the second alarm module includes a first inverter, a second inverter, a third inverter, an eighth diode, a ninth diode, a tenth diode, a ninth resistor, a second triode, a second alarm device and a third DC source;

[0027] Preferably, the input end of the first inverter, the input end of the second inverter and the input end of the third inverter are respectively connected to the output end of the first comparison device, the output end of the second comparison device and the output end of the third comparison device, the output end of the first inverting end, the output end of the second inverter and the output end of the third inverter are respectively connected to the anode of the eighth diode, the anode of the ninth diode and the anode of the tenth diode, the cathode of the eighth diode is connected to the cathode of the ninth diode and the cathode of the tenth diode and is connected to the base of the second triode through the ninth resistor, the emitter of the second triode is grounded, the collector of the second triode is connected to one end of the second alarm device, and the second end of the second alarm device is connected to the third DC source.

[0028] As a further solution of the present invention: the data transmission module includes a signal transmission device, an eleventh diode and a twelfth diode;

[0029] Preferably, the CTRL1, CTRL2 and CTRL3 terminals of the signal transmission device are connected to the cathode of the eleventh diode and the cathode of the twelfth diode, the anode of the eleventh diode and the anode of the twelfth diode are connected to the cathode of the fifth diode and the cathode of the eighth diode respectively, the IN1, IN2 and IN3 terminals of the signal transmission device are connected to the OUT terminal of the first coupler, the fourth terminal of the first detection device and the fourth terminal of the second detection device respectively, and the OUT1, OUT2 and OUT3 terminals of the signal transmission device are connected to the IO2, IO3 and IO4 terminals of the first processor respectively.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: the voltage anomaly detection alarm circuit of the air-conditioning unit of the present invention performs isolated three-phase voltage detection on the air-conditioning unit control module by the three-phase isolation detection module, adjusts the phase shift range of the first change control module and the second change control module by the central module, controls the first change control module and the second change control module to perform phase shift processing on the signal output by the three-phase isolation detection module, compares the voltage magnitude relationship between the signal output by the first change control module, the signal output by the second change control module and the signal after the voltage drop of the three-phase isolation detection module by the voltage comparison module, and then performs a voltage anomaly alarm by the first alarm module and the second alarm module, which can timely determine whether the voltage is faulty, and at the same time controls the data transmission module to transmit the signal detected by the three-phase isolation detection module to the central module, thereby reducing the energy consumption and data processing amount of the central module and improving the voltage detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0032] Figure 1 A schematic block diagram of a voltage anomaly detection and alarm circuit for an air-conditioning unit provided by an embodiment of the present invention.

[0033] Figure 2 A circuit diagram of an abnormal voltage detection and alarm circuit for an air-conditioning unit provided by an embodiment of the present invention.

[0034] Figure 3 A circuit diagram of a first alarm module provided in an embodiment of the present invention.

[0035] Figure 4 This is a circuit diagram of a second alarm module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In one embodiment, see Figure 1 , an air conditioning unit voltage anomaly detection alarm circuit, comprising: an air conditioning unit control module 1, a central module 2, a three-phase isolation detection module 3, a first change control module 4, a second change control module 5, a voltage comparison module 6, a first alarm module 7, a second alarm module 8 and a data transmission module 9;

[0038] Specifically, the air conditioning unit control module 1 is connected to the central module 2, and is used to receive the AC power and rectify the AC power. When receiving the first pulse signal output by the central module 2, the rectified power is subjected to three-phase inversion and outputs the three-phase power.

[0039] The central module 2 is connected with the data transmission module 9, the first change control module 4 and the second change control module 5, and is used to output a first pulse signal, output a second pulse signal and a third pulse signal according to the phase angle of the three-phase electric energy, and respectively control the phase shifting operation of the first change control module 4 and the second change control module 5, and receive the first detection signal, the second detection signal and the third detection signal transmitted by the data transmission module 9;

[0040] The three-phase isolation detection module 3 is connected to the air conditioning unit control module 1, and is used to perform isolation voltage detection on the three-phase electric energy and output a first detection signal, a second detection signal and a third detection signal respectively, and perform voltage drop processing on the second detection signal and output a first voltage signal;

[0041] The first change control module 4 is connected to the three-phase isolation detection module 3 and is used to perform phase shift processing on the first detection signal and output a second voltage signal when receiving the second pulse signal;

[0042] The second change control module 5 is connected to the three-phase isolation detection module 3 and is used for performing phase shift processing on the third detection signal and outputting a third voltage signal when receiving the third pulse signal;

[0043] a voltage comparison module 6, connected to the first change control module 4, the second change control module 5 and the three-phase isolation detection module 3, for performing voltage comparison processing on the first voltage signal and the second voltage signal and outputting a first level signal, performing voltage comparison processing on the third voltage signal and the second voltage signal and outputting a second level signal, and performing voltage comparison processing on the first voltage signal and the third voltage signal and outputting a third level signal;

[0044] A first alarm module 7, connected to the voltage comparison module 6, for receiving the first level signal, the second level signal and the third level signal and performing an alarm when the first level signal, the second level signal or the third level signal is in a high level state;

[0045] A second alarm module 8, connected to the voltage comparison module 6, is used to invert the first level signal, the second level signal and the third level signal and to perform an alarm when the inverted first level signal, the inverted second level signal or the inverted third level signal is in a high level state;

[0046] The data transmission module 9 is connected to the three-phase isolation detection module 3, the first alarm module 7 and the second alarm module 8, and is used to transmit the first detection signal, the second detection signal and the third detection signal to the central module 2 when receiving the first level signal, the second level signal, the third level signal, the inverted first voltage signal, the inverted second level signal or the inverted third level signal in a high level state.

[0047] In a specific embodiment, the air conditioning unit control module 1, the central module 2, the three-phase isolation detection module 3, the first change control module 4, the second change control module 5, the voltage comparison module 6, the first alarm module 7, the second alarm module 8 and the data transmission module 9

[0048] In another embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 , the air conditioning unit control module 1 includes a power access port, a full-wave rectifier T1, a three-phase inverter T2 and an air conditioning fan; the central module 2 includes a first processor U1;

[0049] Specifically, the first end and the second end of the power access port are respectively connected to the first end and the second end of the full-wave rectifier T1, the third end and the fourth end of the full-wave rectifier T1 are respectively connected to the first input end and the second input end of the three-phase inverter T2, the first output end, the second output end and the third output end of the three-phase inverter T2 are respectively connected to the first end, the second end and the third end of the air-conditioning fan, and the control end of the three-phase inverter T2 is connected to the IO1 end of the first processor U1.

[0050] In a specific embodiment, the three-phase inverter T2 may be composed of six groups of IGBTs to perform three-phase inverter work; the first processor U1 may use an STM32 single-chip microcomputer to receive and process signals and control modules.

[0051] Further, the three-phase isolation detection module 3 includes a first fuse FU1, a thirteenth diode D13, a first coupler U2, a first resistor R1, a first DC source VCC1, a first detection device, a second detection device, a second diode D2 and a third diode D3;

[0052] Specifically, the IN1 end of the first coupler U2 is connected to the cathode of the thirteenth diode D13 and is connected to the first output end of the three-phase inverter T2 through the first fuse FU1, the first end of the first detection device is connected to the second output end of the three-phase inverter T2, the first end of the second detection device is connected to the third output end of the three-phase inverter T2, the IN2 end of the first coupler U2 is connected to the anode of the thirteenth diode D13, the second end of the first detection device, the second end of the second detection device and the second input end of the three-phase inverter T2, the third end of the first detection device, the third end of the second detection device and the VCC end of the first coupler U2 are all connected to the first DC source VCC1, the OUT end of the first coupler U2 is connected to the first change control module 4 and is grounded through the first resistor R1, the fourth end of the first detection device is connected to the anode of the second diode D2 and the anode of the third diode D3, the cathode of the second diode D2 and the cathode of the third diode D3 are connected to the voltage comparison module 6, and the fourth end of the second detection device is connected to the second change control module 5.

[0053] In a specific embodiment, the first coupler U2 may be a PC817 photoelectric coupler. When electric energy is input to the IN1 terminal of the first coupler U2, the VCC terminal and the OUT terminal of the first coupler U2 are turned on, and then a high-level signal is output from the OUT terminal. The circuit composition structure of the first detection device and the circuit composition structure of the second detection device are the same as the circuit composition structure of the first fuse FU1, the thirteenth diode D13, the first coupler U2, the first resistor R1 and the first DC source VCC1.

[0054] Further, the first change control module 4 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a first operational amplifier OP1, a first field effect transistor Q1 and a first diode D1;

[0055] Specifically, the drain of the first field effect transistor Q1 is connected to one end of the third resistor R3 and the OUT end of the first coupler U2 through the second resistor R2, the source of the first field effect transistor Q1 is connected to the in-phase end of the first operational amplifier OP1 and is grounded through the first capacitor C1, the inverting end of the first operational amplifier OP1 is connected to the other end of the third resistor R3 and is connected to the output end of the first operational amplifier OP1 and the anode of the first diode D1 through the fourth resistor R4, the cathode of the first diode D1 is connected to the voltage comparison module 6, and the gate of the first field effect transistor Q1 is connected to the IO5 end of the first processor U1.

[0056] In a specific embodiment, the first operational amplifier OP1 can select an OP07 operational amplifier, and cooperate with the second resistor R2, the third resistor R3, the fourth resistor R4, the first capacitor C1, the first operational amplifier OP1 and the first field effect transistor Q1 to perform phase lag processing, and the phase angle is adjusted by the first field effect transistor Q1, wherein the first field effect transistor Q1 can select an N-channel field effect transistor with a body diode; the first diode D1 performs voltage drop processing.

[0057] Further, the second change control module 5 includes a fifth resistor R5, a second capacitor C2, a sixth resistor R6, a seventh resistor R7, a second field effect transistor Q2, a second operational amplifier OP2 and a fourth diode D4;

[0058] Specifically, the in-phase end of the second operational amplifier OP2 is connected to one end of the seventh resistor R7 and is connected to one end of the second capacitor C2 through the fifth resistor R5 and the fourth end of the second detection device, the inverting end of the second operational amplifier OP2 is connected to the other end of the second capacitor C2 and is connected to the drain of the second field effect transistor Q2 through the sixth resistor R6, the source of the second field effect transistor Q2 is grounded, the output end of the second operational amplifier OP2 is connected to the other end of the seventh resistor R7 and the anode of the fourth diode D4, the cathode of the fourth diode D4 is connected to the voltage comparison module 6, and the gate of the second field effect transistor Q2 is connected to the IO6 end of the first processor U1.

[0059] In a specific embodiment, the second operational amplifier OP2 can select an OP07 operational amplifier, and cooperate with the fifth resistor R5, the second capacitor C2, the sixth resistor R6, the seventh resistor R7 and the second field effect transistor Q2 to perform phase advance processing. The phase angle is adjusted by the second field effect transistor Q2, and the phase angle is the same as the phase angle of the first change control module 4. The second field effect transistor Q2 can select an N-channel field effect transistor with a body diode; the fourth diode D4 performs voltage drop processing.

[0060] Further, the voltage comparison module 6 comprises a first comparison device A1, a second comparison device A2 and a third comparison device A3;

[0061] Specifically, the in-phase end of the first comparison device A1 is connected to the inverting end of the third comparison device A3 and the cathode of the first diode D1, the inverting end of the first comparison device A1 and the inverting end of the second comparison device A2 are respectively connected to the cathode of the second diode D2 and the cathode of the third diode D3, the in-phase end of the second comparison device A2 is connected to the in-phase end of the third comparison device A3 and the cathode of the fourth diode D4, and the output end of the first comparison device A1, the output end of the second comparison device A2 and the output end of the third comparison device A3 are connected to the first alarm module 7 and the second alarm module 8.

[0062] In a specific embodiment, the first comparison device A1, the second comparison device A2 and the third comparison device A3 can all use LM385 comparators. When the voltages of the in-phase terminals and the inverters of the first comparison device A1, the second comparison device A2 and the third comparison device A3 are the same, a 0V voltage is output. The positive voltage and the negative voltage of the first comparison device A1, the second comparison device A2 and the third comparison device A3 are the same, and the high-level potential output by the first comparison device A1, the second comparison device A2 and the third comparison device A3 is determined by the positive voltage, and the low-level potential is determined by the negative voltage.

[0063] Further, the first alarm module 7 includes a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth resistor R8, a first transistor V1, a first alarm device and a second DC source VCC2;

[0064] Specifically, the anode of the fifth diode D5, the anode of the sixth diode D6 and the anode of the seventh diode D7 are respectively connected to the output end of the first comparison device A1, the output end of the second comparison device A2 and the output end of the third comparison device A3, the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6 and the cathode of the seventh diode D7 and is connected to the base of the first transistor V1 through the eighth resistor R8, the emitter of the first transistor V1 is grounded, the collector of the first transistor V1 is connected to one end of the first alarm device, and the other end of the first alarm device is connected to the second DC source VCC2.

[0065] In a specific embodiment, the first transistor V1 may be an NPN transistor; and the first alarm device may be a loudspeaker.

[0066] Further, the second alarm module 8 includes a first inverter J1, a second inverter J2, a third inverter J3, an eighth diode D8, a ninth diode D9, a tenth diode D10, a ninth resistor R9, a second triode V2, a second alarm device and a third DC source VCC3;

[0067] Specifically, the input end of the first inverter J1, the input end of the second inverter J2 and the input end of the third inverter J3 are respectively connected to the output end of the first comparison device A1, the output end of the second comparison device A2 and the output end of the third comparison device A3, the output end of the first inverting end, the output end of the second inverter J2 and the output end of the third inverter J3 are respectively connected to the anode of the eighth diode D8, the anode of the ninth diode D9 and the anode of the tenth diode D10, the cathode of the eighth diode D8 is connected to the cathode of the ninth diode D9 and the cathode of the tenth diode D10 and is connected to the base of the second triode V2 through the ninth resistor R9, the emitter of the second triode V2 is grounded, the collector of the second triode V2 is connected to one end of the second alarm device, and the second end of the second alarm device is connected to the third DC source VCC3.

[0068] In a specific embodiment, the first inverter J1, the second inverter J2 and the third inverter J3 can all use NOT gate signals; the second transistor V2 can use an NPN transistor; and the second alarm device can use a loudspeaker.

[0069] Further, the data transmission module 9 includes a signal transmission device U3, an eleventh diode D11 and a twelfth diode D12;

[0070] Specifically, the CTRL1, CTRL2 and CTRL3 terminals of the signal transmission device U3 are connected to the cathode of the eleventh diode D11 and the cathode of the twelfth diode D12, the anode of the eleventh diode D11 and the anode of the twelfth diode D12 are respectively connected to the cathode of the fifth diode D5 and the cathode of the eighth diode D8, the IN1, IN2 and IN3 terminals of the signal transmission device U3 are respectively connected to the OUT terminal of the first coupler U2, the fourth terminal of the first detection device and the fourth terminal of the second detection device, and the OUT1, OUT2 and OUT3 terminals of the signal transmission device U3 are respectively connected to the IO2, IO3 and IO4 terminals of the first processor U1.

[0071] In a specific embodiment, the signal transmission device U3 may use a CD4066 chip.

[0072] In a voltage anomaly detection alarm circuit for an air-conditioning unit in the present embodiment, AC power is connected to a power access port, a full-wave rectifier T1 performs rectification, an IO1 terminal of a first processor U1 controls a three-phase inverter T2 to perform three-phase inversion and output three-phase power, and a phase difference of the three-phase power is 120 degrees, and at the same time, a first coupler U2, a first detection device and a second detection device respectively isolate and detect a voltage of a first phase line, a voltage of a second phase line and a voltage of a third phase line, and respectively output a first detection signal, a second detection signal and a third detection signal, and an IO5 terminal and an IO6 terminal of the first processor U1 respectively control a conduction degree of a first field effect transistor Q1 and a second field effect transistor Q2, and the first field effect transistor Q1 cooperates with a second resistor to generate a three-phase power. R2, the third resistor R3, the first capacitor C1, the fourth resistor R4 and the first operational amplifier OP1 perform a 120-degree delayed phase shift on the first detection signal, and the second field effect transistor Q2 cooperates with the second capacitor C2, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the second operational amplifier OP2 to perform a 120-degree advanced phase shift on the third detection signal. Here, the advanced phase shift angle and the delayed phase shift angle are the same as the phase difference of the three-phase electric energy, and change with the phase difference of the three-phase electric energy. At the same time, the first diode D1 performs a voltage drop processing on the signal output by the first operational amplifier OP1, the fourth diode D4 performs a voltage drop processing on the signal output by the second operational amplifier OP2, and the second diode D2 and the third diode D3 perform voltage drop processing on the second detection signal output by the first detection device. When the voltage output by the first diode D1 is greater than the voltage output by the second diode D2, the first comparison device A1 outputs a high level. When the voltage output by the fourth diode D4 is greater than the voltage output by the third diode D3, the second comparison device A2 outputs a high level. When the voltage output by the fourth diode D4 is greater than the voltage output by the first diode D1, the third comparison device A3 outputs a high level. At this time, the second phase line voltage is used as the comparison object, that is, the first phase line voltage is greater than the second phase line voltage or the third phase line voltage is greater than the second phase line voltage. When the third phase line voltage is greater than the first phase line voltage, the first transistor V1 is turned on, and the first alarm device is turned on. The first inverter J1, the second inverter J2 and the third inverter J3 respectively invert the low level signals output by the first comparison device A1, the second comparison device A2 and the third comparison device A3, that is, when the second phase line voltage is greater than the first phase line voltage or greater than the third phase line voltage, and the first phase line voltage is greater than the third phase line voltage, the second triode V2 is turned on, and the second alarm device alarms, and when the first triode V1 or the second triode V2 is turned on, the CTRL1 terminal, the CTRL2 terminal and the CTRL3 terminal of the signal transmission device U3 are all high level, the signal transmission device U3 will transmit the first detection signal, the second detection signal and the third detection signal, and are received and processed by the first processor U1.

[0073] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0074] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An abnormal voltage detection alarm circuit for an air conditioning unit, characterized in that: The voltage anomaly detection and alarm circuit of the air-conditioning unit comprises: an air-conditioning unit control module, a central module, a three-phase isolation detection module, a first change control module, a second change control module, a voltage comparison module, a first alarm module, a second alarm module and a data transmission module; The air conditioning unit control module is connected to the central module and is used to receive AC power and rectify the AC power. When receiving the first pulse signal output by the central module, the rectified power is subjected to three-phase inversion and output three-phase power to control the operation of the air conditioning unit. The central module is connected to the data transmission module, the first change control module and the second change control module, and is used to output a first pulse signal, output a second pulse signal and a third pulse signal according to the phase value of the three-phase electric energy, and respectively control the phase shifting operation of the first change control module and the second change control module, and receive a first detection signal, a second detection signal and a third detection signal transmitted by the data transmission module; The three-phase isolation detection module is connected to the air conditioning unit control module, and is used to perform isolation voltage detection on the three-phase electric energy and output a first detection signal, a second detection signal and a third detection signal respectively, and perform voltage drop processing on the second detection signal and output a first voltage signal; The first change control module is connected to the three-phase isolation detection module and is used to perform phase shift processing on the first detection signal and output a second voltage signal when receiving the second pulse signal; The second change control module is connected to the three-phase isolation detection module, and is used to perform phase shift processing on the third detection signal and output a third voltage signal when receiving the third pulse signal; The voltage comparison module is connected to the first change control module, the second change control module and the three-phase isolation detection module, and is used to perform voltage comparison processing on the first voltage signal and the second voltage signal and output a first level signal, perform voltage comparison processing on the third voltage signal and the second voltage signal and output a second level signal, and perform voltage comparison processing on the first voltage signal and the third voltage signal and output a third level signal; The first alarm module is connected to the voltage comparison module, and is used to receive the first level signal, the second level signal and the third level signal, and to perform an alarm when the first level signal, the second level signal or the third level signal is in a high level state; The second alarm module is connected to the voltage comparison module, and is used to invert the first level signal, the second level signal and the third level signal, and to perform an alarm when the inverted first level signal, the inverted second level signal or the inverted third level signal is in a high level state; The data transmission module is connected to the three-phase isolation detection module, the first alarm module and the second alarm module, and is used to transmit the first detection signal, the second detection signal and the third detection signal to the central module when receiving the first level signal, the second level signal, the third level signal, the inverted first voltage signal, the inverted second level signal or the inverted third level signal in a high level state.

2. The voltage abnormality detection alarm circuit of an air conditioning unit according to claim 1, characterized in that: The air conditioning unit control module includes a power access port, a full-wave rectifier, a three-phase inverter and an air conditioning fan; the central module includes a first processor; The first end and the second end of the power access port are respectively connected to the first end and the second end of the full-wave rectifier, the third end and the fourth end of the full-wave rectifier are respectively connected to the first input end and the second input end of the three-phase inverter, the first output end, the second output end and the third output end of the three-phase inverter are respectively connected to the first end, the second end and the third end of the air-conditioning fan, and the control end of the three-phase inverter is connected to the IO1 end of the first processor.

3. The voltage anomaly detection alarm circuit for an air conditioner unit according to claim 2, characterized in that: The three-phase isolation detection module includes a first fuse, a thirteenth diode, a first coupler, a first resistor, a first DC source, a first detection device, a second detection device, a second diode and a third diode; The IN1 end of the first coupler is connected to the cathode of the thirteenth diode and is connected to the first output end of the three-phase inverter through the first fuse, the first end of the first detection device is connected to the second output end of the three-phase inverter, the first end of the second detection device is connected to the third output end of the three-phase inverter, the IN2 end of the first coupler is connected to the anode of the thirteenth diode, the second end of the first detection device, the second end of the second detection device and the second input end of the three-phase inverter, the third end of the first detection device, the third end of the second detection device and the VCC end of the first coupler are all connected to the first DC source, the OUT end of the first coupler is connected to the first change control module and is grounded through the first resistor, the fourth end of the first detection device is connected to the anode of the second diode and the anode of the third diode, the cathode of the second diode and the cathode of the third diode are connected to the voltage comparison module, and the fourth end of the second detection device is connected to the second change control module.

4. The voltage anomaly detection alarm circuit for an air conditioning unit according to claim 3, characterized in that: The first change control module includes a second resistor, a third resistor, a fourth resistor, a first capacitor, a first operational amplifier, a first field effect transistor and a first diode; The drain of the first field effect transistor is connected to one end of the third resistor and the OUT end of the first coupler through the second resistor, the source of the first field effect transistor is connected to the in-phase end of the first operational amplifier and is grounded through the first capacitor, the inverting end of the first operational amplifier is connected to the other end of the third resistor and is connected to the output end of the first operational amplifier and the anode of the first diode through the fourth resistor, the cathode of the first diode is connected to the voltage comparison module, and the gate of the first field effect transistor is connected to the IO5 end of the first processor.

5. The voltage anomaly detection alarm circuit for an air conditioning unit according to claim 4, characterized in that: The second change control module includes a fifth resistor, a second capacitor, a sixth resistor, a seventh resistor, a second field effect transistor, a second operational amplifier and a fourth diode; The in-phase end of the second operational amplifier is connected to one end of the seventh resistor and to one end of the second capacitor through the fifth resistor and to the fourth end of the second detection device, the inverting end of the second operational amplifier is connected to the other end of the second capacitor and to the drain of the second field effect transistor through the sixth resistor, the source of the second field effect transistor is grounded, the output end of the second operational amplifier is connected to the other end of the seventh resistor and the anode of the fourth diode, the cathode of the fourth diode is connected to the voltage comparison module, and the gate of the second field effect transistor is connected to the IO6 end of the first processor.

6. The voltage anomaly detection alarm circuit for an air conditioning unit according to claim 5, characterized in that: The voltage comparison module includes a first comparison device, a second comparison device and a third comparison device; The non-inverting end of the first comparison device is connected to the inverting end of the third comparison device and the cathode of the first diode, the inverting end of the first comparison device and the inverting end of the second comparison device are respectively connected to the cathode of the second diode and the cathode of the third diode, the non-inverting end of the second comparison device is connected to the non-inverting end of the third comparison device and the cathode of the fourth diode, and the output end of the first comparison device, the output end of the second comparison device and the output end of the third comparison device are connected to the first alarm module and the second alarm module.

7. The voltage anomaly detection alarm circuit for an air conditioner unit according to claim 6, characterized in that: The first alarm module includes a fifth diode, a sixth diode, a seventh diode, an eighth resistor, a first triode, a first alarm device and a second DC source; The anodes of the fifth diode, the sixth diode and the seventh diode are respectively connected to the output end of the first comparison device, the output end of the second comparison device and the output end of the third comparison device, the cathode of the fifth diode is connected to the cathode of the sixth diode and the cathode of the seventh diode and is connected to the base of the first transistor through the eighth resistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected to one end of the first alarm device, and the other end of the first alarm device is connected to the second DC source.

8. The voltage anomaly detection alarm circuit for an air conditioner unit according to claim 7, characterized in that: The second alarm module includes a first inverter, a second inverter, a third inverter, an eighth diode, a ninth diode, a tenth diode, a ninth resistor, a second triode, a second alarm device and a third DC source; The input end of the first inverter, the input end of the second inverter and the input end of the third inverter are respectively connected to the output end of the first comparison device, the output end of the second comparison device and the output end of the third comparison device, the output end of the first inverting end, the output end of the second inverter and the output end of the third inverter are respectively connected to the anode of the eighth diode, the anode of the ninth diode and the anode of the tenth diode, the cathode of the eighth diode is connected to the cathode of the ninth diode and the cathode of the tenth diode and is connected to the base of the second triode through the ninth resistor, the emitter of the second triode is grounded, the collector of the second triode is connected to one end of the second alarm device, and the second end of the second alarm device is connected to the third DC source.

9. The voltage anomaly detection alarm circuit for an air conditioning unit according to claim 8, characterized in that: The data transmission module includes a signal transmission device, an eleventh diode and a twelfth diode; The CTRL1, CTRL2 and CTRL3 terminals of the signal transmission device are connected to the cathode of the eleventh diode and the cathode of the twelfth diode, the anode of the eleventh diode and the anode of the twelfth diode are connected to the cathode of the fifth diode and the cathode of the eighth diode respectively, the IN1, IN2 and IN3 terminals of the signal transmission device are connected to the OUT terminal of the first coupler, the fourth terminal of the first detection device and the fourth terminal of the second detection device respectively, and the OUT1, OUT2 and OUT3 terminals of the signal transmission device are connected to the IO2, IO3 and IO4 terminals of the first processor respectively.

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