Multifunctional wiring mainboard, multifunctional wiring terminal board and air conditioner

Abstract

The application discloses a multifunctional wiring mainboard, a multifunctional wiring terminal board and an air conditioner. The multifunctional wiring mainboard comprises a first detection circuit connected with a three-phase power supply and used for detecting phase loss or phase sequence imbalance of the three-phase power supply; a second detection circuit connected with the three-phase power supply and used for detecting reverse phase of the three-phase power supply; a power supply circuit connected with the three-phase power supply and used for supplying power for other circuits in the multifunctional wiring mainboard; and a control circuit connected with the first detection circuit and the second detection circuit and used for controlling operation of a load of the three-phase power supply according to detection results of the first detection circuit and the second detection circuit. The application solves the technical problem of single function of the wiring terminal board.

Description

Technical Field

[0001] This application relates to the field of control, and more specifically, to a multi-functional wiring main board, a multi-functional terminal block, and an air conditioner. Background Technology

[0002] Terminal blocks make electrical wiring connections more convenient and faster. With the changing needs of circuit development, different types of terminal blocks have been introduced to the market, including single-layer, double-layer, current-type, and voltage-type. In circuits, terminal blocks not only serve a connection function but also provide signal isolation, circuit power supply, circuit protection, and signal conversion. As circuit systems evolve, the function of terminal blocks can no longer be limited to wire connection.

[0003] In three-phase power supplies, abnormal load operation often occurs due to phase loss, reverse phase, and other reasons, with unpredictable impacts on electrical equipment. Currently, the main solution to this problem is to add phase sequence protectors. However, phase sequence protectors are relatively large and require separate wiring for secondary conversion, making them less suitable for applications such as air conditioning systems, and they are also more expensive.

[0004] There is currently no effective solution to the problem of the terminal block board having limited functionality. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a multi-functional wiring main board, a multi-functional wiring terminal board, and an air conditioner, so as to at least solve the technical problem of the single function of the wiring terminal board.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] According to one aspect of the embodiments of this application, a multifunctional wiring main board is provided, comprising: a first detection circuit connected to a three-phase power supply for detecting phase loss or phase sequence imbalance of the three-phase power supply; a second detection circuit connected to the three-phase power supply for detecting reverse phase of the three-phase power supply; a power supply circuit connected to the three-phase power supply for supplying power to other circuits in the multifunctional wiring main board; and a control circuit connected to the first detection circuit and the second detection circuit for controlling the operation of the load of the three-phase power supply according to the detection results of the first detection circuit and the second detection circuit.

[0008] Optionally, the first detection circuit includes three voltage comparators, each with its input terminal connected to two phases of the three-phase power supply and its output terminal connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has experienced a phase loss or phase sequence imbalance.

[0009] Optionally, the first detection circuit includes: three step-down rectifier circuits and three step-down circuits. One end of each step-down rectifier circuit is connected to one phase of the three-phase power supply, and the other end is connected to one of the step-down circuits. One phase of the three-phase power supply is rectified by one of the step-down rectifier circuits, and the other phase is rectified by another step-down rectifier circuit and then stepped down by another step-down circuit before entering the two input terminals of the same voltage comparator.

[0010] Optionally, the three voltage comparators are used to output a high level when there is no phase loss and no phase sequence imbalance in the three-phase power supply.

[0011] Optionally, the second detection circuit includes: a conversion circuit, one end of which is connected to the three-phase power supply, for converting the phase sequence of the three-phase power supply into two voltages; and a voltage comparison circuit, the input end of which is connected to the other end of the conversion circuit and the output end of which is connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has reversed phase based on the voltage values ​​of the two voltages.

[0012] Optionally, the conversion circuit includes: a first resistor, one end of which is connected to the first phase of the three-phase power supply; a capacitor, one end of which is connected to the second phase of the three-phase power supply; a second resistor, one end of which is connected to the third phase of the three-phase power supply; a third resistor, one end of which is connected to the other end of the first resistor, and the other end of the third resistor outputs a voltage; a fourth resistor, one end of which is connected to the other end of the second resistor, and the other end of the fourth resistor outputs a voltage; a fifth resistor and a sixth resistor, one end of which is connected to the other end of the first resistor, one end of which is connected to the other end of the second resistor, and the other ends of the fifth resistor, the sixth resistor, and the capacitor are connected together.

[0013] Optionally, the voltage comparison circuit includes: a filter sub-circuit connected to the conversion circuit for filtering the two voltages output by the conversion circuit; and a voltage comparator, with its input connected to the filter sub-circuit and its output connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has reversed phase based on the voltage values ​​of the two voltages.

[0014] Optionally, the voltage comparator is configured to output a high level when the three-phase power supply is not reversed.

[0015] Optionally, the control circuit includes a relay, the power supply terminal of which is connected to the power supply circuit, and the input terminal of which is connected to three voltage comparators of the first detection circuit and one voltage comparator of the second detection circuit, respectively, for closing when the outputs of the four voltage comparators are all high, to indicate that the load has started to run.

[0016] According to another aspect of the embodiments of this application, a multi-functional terminal block is also provided, including: the aforementioned multi-functional terminal block and a housing, wherein the housing is provided with the interfaces required by the multi-functional terminal block.

[0017] According to another aspect of the embodiments of this application, an air conditioner is also provided, wherein the motor or compressor of the air conditioner uses the aforementioned multi-functional terminal block.

[0018] In this embodiment, the system includes: a first detection circuit connected to the three-phase power supply for detecting phase loss or phase sequence imbalance in the three-phase power supply; a second detection circuit connected to the three-phase power supply for detecting reverse phase in the three-phase power supply; a power supply circuit connected to the three-phase power supply for supplying power to other circuits in the multi-functional terminal block; and a control circuit connected to the first and second detection circuits for controlling the operation of the load of the three-phase power supply based on the detection results of the first and second detection circuits. While terminal blocks in related technologies only have power line transfer functions, this application adds three-phase phase sequence identification and phase sequence protection functions. By using the phase sequence protection terminal block of this application, problems such as incorrect phase sequence, phase loss, and phase sequence imbalance in the three-phase power supply can be quickly identified at the power input end, and corresponding protection actions can be taken. This solves the technical problem of the single function of the terminal block, simplifies the power supply system for electrical equipment, ensures the safe and reliable operation of three-phase electrical equipment, and saves development costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an optional multi-functional wiring mainboard according to an embodiment of this application;

[0020] Figure 2 This is a top view of an optional terminal block according to an embodiment of this application;

[0021] Figure 3 This is a front view of an optional terminal block according to an embodiment of this application; and,

[0022] Figure 4 This is a cross-sectional view of an optional terminal block according to an embodiment of this application. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0025] In three-phase air conditioning systems, the compressor and motor are critical components, and the reliability and safety requirements for their power supply are extremely stringent. However, three-phase power supplies may experience phase loss, phase sequence imbalance, and reverse phase issues. Once these occur, they can reduce the power supply efficiency of the system, increase system energy consumption, or even damage important loads such as the compressor and motor in the air conditioning system.

[0026] According to one aspect of the embodiments of this application, an embodiment of a multi-functional wiring motherboard is provided. Figure 1 This is a schematic diagram of an optional multi-functional wiring mainboard according to an embodiment of this application, such as... Figure 1 As shown:

[0027] The first detection circuit 11 (i.e., the phase loss and phase sequence imbalance detection part) is connected to the three-phase power supply and is used to detect the phase loss or phase sequence imbalance that occurs in the three-phase power supply.

[0028] Optionally, the first detection circuit includes: three voltage comparators, the input of each voltage comparator being connected to two phases of the three-phase power supply respectively (at least one phase of the power supply connected to any two voltage comparators is different), and the output being connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has experienced a phase loss or phase sequence imbalance.

[0029] Optionally, the first detection circuit includes: three step-down rectifier circuits and three step-down circuits. One end of each step-down rectifier circuit is connected to one phase of the three-phase power supply (i.e., the three step-down rectifier circuits and the three-phase power supply are in a one-to-one correspondence), and the other end is connected to one of the step-down circuits (i.e., the three step-down rectifier circuits and the three step-down circuits are in a one-to-one correspondence). After one phase of the three-phase power supply is rectified by one step-down rectifier circuit, and the other phase is rectified by another step-down rectifier circuit and then stepped down by another step-down circuit, the two voltages enter the two input terminals of the same voltage comparator.

[0030] Optionally, the three voltage comparators are configured to output a high level when there is no phase loss and no phase sequence imbalance in the three-phase power supply.

[0031] The second detection circuit 12 (i.e., the reverse phase detection section) is connected to the three-phase power supply and is used to detect the reverse phase of the three-phase power supply.

[0032] Optionally, the second detection circuit includes: a conversion circuit, one end of which is connected to the three-phase power supply, for converting the phase sequence of the three-phase power supply into two voltages; and a voltage comparison circuit, the input end of which is connected to the other end of the conversion circuit and the output end of which is connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has reversed phase based on the voltage values ​​of the two voltages.

[0033] Optionally, the conversion circuit includes: a first resistor, one end of which is connected to the first phase of the three-phase power supply; a capacitor, one end of which is connected to the second phase of the three-phase power supply; a second resistor, one end of which is connected to the third phase of the three-phase power supply; a third resistor, one end of which is connected to the other end of the first resistor, and the other end of the third resistor outputs a voltage; a fourth resistor, one end of which is connected to the other end of the second resistor, and the other end of the fourth resistor outputs a voltage; a fifth resistor and a sixth resistor, one end of which is connected to the other end of the first resistor, one end of which is connected to the other end of the second resistor, and the other ends of the fifth resistor, the sixth resistor, and the capacitor are connected together.

[0034] Optionally, the voltage comparison circuit includes: a filter sub-circuit connected to the conversion circuit for filtering the two voltages output by the conversion circuit; and a voltage comparator, with its input connected to the filter sub-circuit and its output connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has reversed phase based on the voltage values ​​of the two voltages.

[0035] Optionally, the voltage comparator is configured to output a high level when the three-phase power supply is not reversed.

[0036] The power supply circuit 13 (i.e. the motherboard power supply section) is connected to the three-phase power supply and is used to supply power to other circuits in the multi-functional wiring motherboard.

[0037] The control circuit 14 (i.e., the relay control section) is connected to the first detection circuit and the second detection circuit, and is used to control the operation of the load of the three-phase power supply according to the detection results of the first detection circuit and the second detection circuit.

[0038] Optionally, the control circuit includes a relay, the power supply terminal of which is connected to the power supply circuit, and the input terminal of which is connected to three voltage comparators of the first detection circuit and one voltage comparator of the second detection circuit, respectively, for closing when the outputs of the four voltage comparators are all high, to indicate that the load has started to run.

[0039] The multi-functional terminal block of this application includes: a first detection circuit connected to the three-phase power supply for detecting phase loss or phase sequence imbalance of the three-phase power supply; a second detection circuit connected to the three-phase power supply for detecting reverse phase of the three-phase power supply; a power supply circuit connected to the three-phase power supply for supplying power to other circuits in the multi-functional terminal block; and a control circuit connected to the first and second detection circuits for controlling the operation of the load of the three-phase power supply according to the detection results of the first and second detection circuits. While terminal blocks in related technologies only have power line transfer functions, this application adds three-phase phase sequence identification and phase sequence protection functions. By using the phase sequence protection terminal block of this application, problems such as phase sequence errors, phase loss, and phase sequence imbalance of the three-phase power supply can be quickly identified at the power input end, and corresponding protection actions can be taken. This solves the technical problem of the single function of the terminal block, simplifies the power supply system for electrical equipment, ensures the safe and reliable operation of three-phase electrical equipment, and saves development costs.

[0040] According to another aspect of the embodiments of this application, an embodiment of a multi-functional terminal block is also provided. This terminal block with phase sequence protection includes: the aforementioned multi-functional terminal block and a housing, wherein the housing is provided with the interface required by the multi-functional terminal block.

[0041] This solution, building upon the traditional terminal block's function of connecting electrical equipment wires, develops a three-phase protection function, fundamentally changing the terminal block's functionality. It can directly identify three-phase power sequence issues at the power input end and quickly initiate protective action, eliminating the need for secondary transfer to a phase sequence protector. It can replace the phase sequence protector and the wiring used for its transfer. Furthermore, this terminal block reduces the number of protective devices used in electrical equipment, facilitating miniaturization of electrical equipment design. For example, reducing the number of internal components in an air conditioning system's electrical box not only improves internal wiring design but also promotes miniaturization of the electrical box itself.

[0042] like Figure 2 The diagram shows a top view of the phase sequence protection terminal block of this application. 1 and 6 are terminal block mounting holes; 2 is a 250mm conductive connecting piece for the output terminal (brass is recommended); 3 is a phase loss indicator light (three in total, L1, L2, and L3); 4 is silkscreen markings, labeled according to actual requirements (this application uses L1, L2, L3, N, PE as an example); and 5 is a metal screw for the input terminal. Figure 3 The image shown is a front view of the phase sequence protection terminal block of this application, where 5 are metal screws at the input terminals. (As shown...) Figure 4 The diagram shown is a cross-sectional view of the phase sequence protection terminal block of this application. 2 is the output terminal 250 conductive connector, 3 is the phase loss indicator light, 7 is the 250 conductive connector pin, 8 is the main board (the control chip can be an LM239, etc.), 9 and 10 are the main board limit latches, 11 is the input terminal metal connector pin, 12 is the input terminal metal nut, and 13 is the phase loss indicator light pin.

[0043] like Figure 1 The diagram shown is a schematic of a terminal block. The schematic can be divided into four parts: phase loss and phase sequence imbalance detection section 11; reverse phase detection section 12; main board power supply section 13; and relay control section 14.

[0044] The phase loss and phase sequence imbalance detection section mainly consists of three voltage comparators in the LM239 chip. L1, L2, and L3 are stepped down by resistors and capacitors, rectified, and input to the "+" terminals of the three voltage comparators. L1, L2, and L3 are then stepped down again and input to the "-" terminals of the three voltage comparators. Specifically, comparator 1's "+" terminal is connected to L1, and its "-" terminal is connected to L2 (which has undergone a secondary step-down); comparator 2's "+" terminal is connected to L2, and its "-" terminal is connected to L3 (which has undergone a secondary step-down); comparator 3's "+" terminal is connected to L3, and its "-" terminal is connected to L1 (which has undergone a secondary step-down). If the "+" voltage is greater than the "-" voltage, the comparator outputs a high level; if the "+" voltage is less than the "-" voltage, the comparator outputs a low level. This signal is transmitted to control the opening and closing of the relay. If all three voltage comparators output a high level, it indicates that the phase sequence is balanced and there is no phase loss. The relay closes, and the load operates normally.

[0045] In the reverse phase detection section, L1, L2, and L3 are converted to A and B voltage values ​​through RC conversion. The A and B voltage signals are input to the fourth voltage comparator of the LM239 chip for comparison. If the phase sequence is correct, that is, the voltage at the "+" terminal of comparator 4 is greater than the voltage at the "-" terminal, the comparator outputs a high level, causing the relay control section to operate.

[0046] In the motherboard power supply section, L1, L2, and L3 are rectified and stepped down to a 5V voltage level. The 5V voltage can supply the motherboard chip Vcc and the relay coil.

[0047] In the relay control section, the coil voltage is 5V. When the circuit simultaneously meets the requirements, i.e., the phase sequence is correct, the phase sequence is balanced, and there is no phase loss, the relay will operate and the load will work.

[0048] This phase sequence protection terminal block is a three-phase five-wire terminal block. The input end has five screw terminals, and the output end has five double 250mm conductive tabs. The three live wires are L1, L2, and L3, the neutral wire is N, and the ground wire is PE. When wiring, ensure the terminals are securely tightened and the crimping area is effective.

[0049] After the electrical equipment wires are effectively and reliably connected to the terminal block, the power is turned on. The three-phase power flows to the main board 8 through terminals L1, L2, and L3 respectively. The main board 8 is designed to distribute the input three-phase power. There are three branches. The first branch supplies power to the main chip of the terminal block. The three-phase power flows to the main board, and after filtering, rectification, and step-down, a 5V voltage is obtained to provide operating power to the main chip and simultaneously provide the operating voltage to the main circuit relay coil. If there is a misconnection between the live and neutral phases, the main circuit relay of the phase sequence protection terminal block will not operate, and the main circuit cannot be connected.

[0050] The second branch circuit, with three-phase power L1, L2, and L3, flows to the main board through the input metal connection pin 11. After analog information conversion by the main board hardware components, the corresponding high and low level digital signals are acquired and transmitted to the main chip. The voltage comparator inside the main board chip performs phase-to-phase comparison to determine if the three-phase sequence is correct. If the phase sequence is correct, the normally open contact relay on the phase sequence protection terminal block of the main board activates, and current flows through the output 250 conductive connection piece 2 to power the electrical equipment. If the phase sequence is incorrect, the relay does not activate, and an alarm is set on the main board. Once a phase sequence error occurs, the alarm sounds to remind the user that the phase sequence is incorrect and needs to be adjusted.

[0051] The third branch circuit, with three-phase power L1, L2, and L3, flows to the main board via the input metal connection pin 11. Hardware components on the main board process the signals from L1, L2, and L3, transmitting them to the chip voltage comparator for phase-to-phase comparison. If one phase is missing, the corresponding phase-loss indicator 3 illuminates, and the main circuit relay remains inactive. Phase-loss protection and reverse-phase protection use a single relay to control the power supply circuit, thus requiring interlocking. The power supply circuit is only operational and the electrical equipment functions normally when the circuit phase sequence is correct and there are no missing phases.

[0052] In the technical solution of this application, a terminal block can be used to identify phase sequence problems and protect the operating load; the terminal block is designed with a control main board and uses insulating plastic as a supporting shell; a phase loss indicator light is set through the three-phase L1, L2, L3 control circuit to quickly identify the phase loss circuit condition.

[0053] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A multi-functional wiring main board, characterized by, The utility model relates to a three-phase power supply detection and control circuit, comprising: a first detection circuit connected to a three-phase power supply for detecting open-phase or phase sequence imbalance of the three-phase power supply; a second detection circuit connected to the three-phase power supply for detecting reverse-phase of the three-phase power supply; a power supply circuit connected to the three-phase power supply for supplying power to other circuits in the multifunctional wiring mainboard; a control circuit connected to the first detection circuit and the second detection circuit for controlling operation of a load of the three-phase power supply according to detection results of the first detection circuit and the second detection circuit; the first detection circuit comprises: three voltage comparators, each of which has two input terminals connected to two phases of the three-phase power supply and an output terminal connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has open-phase or phase sequence imbalance; the second detection circuit comprises: a conversion circuit having one end connected to the three-phase power supply for converting phase sequence of the three-phase power supply into two voltages; a voltage comparison circuit having an input terminal connected to the other end of the conversion circuit and an output terminal connected to the control circuit, for outputting a detection result indicating whether the three-phase power supply has reverse-phase according to voltage values of the two voltages; the control circuit comprises: a relay having a power supply terminal connected to the power supply circuit and input terminals connected to the three voltage comparators of the first detection circuit and one voltage comparator of the second detection circuit, for closing when output terminals of the four voltage comparators are all high to indicate that the load starts to operate.

2. The multi-functional wiring main board according to claim 1, characterized by, the first detection circuit comprises: three voltage reduction rectifier circuits and three voltage reduction circuits, each of the voltage reduction rectifier circuits having one end connected to one phase of the three-phase power supply and the other end connected to one of the voltage reduction circuits; one phase of two adjacent phases of the three-phase power supply passes through one of the voltage reduction rectifier circuits for voltage reduction rectification, the other phase passes through another of the voltage reduction rectifier circuits for voltage reduction rectification and then passes through one of the voltage reduction circuits for voltage reduction before entering two input terminals of the same voltage comparator.

3. The multi-functional wiring main board according to claim 1, wherein the three voltage comparators are configured to output high when the three-phase power supply does not have open-phase and does not have phase sequence imbalance.

4. The multi-functional wiring main board according to claim 1, wherein the conversion circuit comprises: a first resistor having one end connected to a first phase of the three-phase power supply; a capacitor having one end connected to a second phase of the three-phase power supply; a second resistor having one end connected to a third phase of the three-phase power supply; a third resistor having one end connected to the other end of the first resistor and the other end outputting one of the two voltages; a fourth resistor having one end connected to the other end of the second resistor and the other end outputting the other of the two voltages. A fifth resistor and a sixth resistor, one end of the fifth resistor is connected with the other end of the first resistor, one end of the sixth resistor is connected with the other end of the second resistor, the other end of the fifth resistor, the other end of the sixth resistor and the other end of the capacitor are connected.

5. The multi-functional wiring main board according to claim 1, wherein The voltage comparison circuit comprises: A filtering sub-circuit connected with the conversion circuit, used for filtering two-way voltage output by the conversion circuit; A voltage comparator with an input end connected with the filtering sub-circuit and an output end connected with the control circuit, used for outputting a detection result indicating whether the three-phase power supply has a reverse phase according to voltage values of the two-way voltage.

6. The multi-functional wiring main board according to claim 5, wherein The voltage comparator is used for outputting a high level when the three-phase power supply does not have a reverse phase.

7. A multi-functional terminal block, characterized by comprising: The multifunctional wiring mainboard comprises: The multifunctional wiring mainboard according to any one of claims 1 to 6; A shell with interfaces required by the multifunctional wiring mainboard.

8. An air conditioner characterized by comprising: The multifunctional wiring terminal plate is used for a motor or a compressor of the air conditioner.

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