CN214412619U - Controller and air conditioning device - Google Patents

Abstract

The embodiment of the application provides a controller and an air conditioning device, wherein the controller comprises a first input terminal, a second input terminal, a third input terminal, a zero line input terminal, a three-phase rectifier bridge, a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a first resistor and a control unit; the three-phase rectifier bridge comprises a first input terminal, a second input terminal, a third input terminal, a first output terminal and a second output terminal; the control signal output end of the control unit is electrically connected to the control ends of the first switching tube, the second switching tube and the third switching tube; and the first power supply terminal of the control unit is electrically connected with the third input terminal, and the second power supply terminal of the control unit is electrically connected with the zero line input terminal. The controller has the characteristics of safety and high efficiency.

Description

Controller and air conditioning device

The present application claims priority from a domestic application filed on 14/12/2020, having application number 202023003644.6 and entitled "a controller and air conditioner", the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to a motor control technical field, in particular to electric protection's controller and air conditioning equipment on relevant bus-bar capacitance.

Background

In an electrical apparatus, such as an air conditioner, a washing machine, a refrigerator, etc., a control circuit of a controller of the electrical apparatus is often provided with a rectifier bridge, and a dc side behind the rectifier bridge is often provided with a bus capacitor, as shown in fig. 1, in order to protect the bus capacitor, a circuit topology as shown in fig. 1 is provided, when the electrical apparatus is powered on, a resistor R11 is switched on, and a resistor R11 is used to prevent a rush current during power on from damaging the bus capacitor. When the bus capacitor is charged, the resistor R11 is switched off, the switch tube K11 is closed, and the controller works normally.

SUMMERY OF THE UTILITY MODEL

Based on this, the embodiment of the application provides a controller and air conditioning equipment, can realize the protection to bus capacitance.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

a controller comprises a first input terminal, a second input terminal, a third input terminal, a zero line input terminal, a three-phase rectifier bridge, a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a first resistor and a control unit;

the three-phase rectifier bridge comprises a first input terminal, a second input terminal, a third input terminal, a first output terminal and a second output terminal; the first input terminal is electrically connected with a first end of the first switch tube, and a second end of the first switch tube is electrically connected with the first input terminal; the second input terminal is electrically connected with a first end of the second switch tube, and a second end of the second switch tube is electrically connected with the second input terminal; the third input terminal is electrically connected to the third input terminal;

a first end of the first capacitor is electrically connected with the first output terminal, a second end of the first capacitor is electrically connected with a first end of the second capacitor, and a second end of the second capacitor is electrically connected with the second output terminal; the zero line input terminal is electrically connected with a first end of the third switching tube, a second end of the third switching tube is electrically connected with a first end of the first resistor, and a second end of the first resistor is electrically connected with a second end of the first capacitor; the control signal output end of the control unit is electrically connected to the control ends of the first switching tube, the second switching tube and the third switching tube; and the first power supply terminal of the control unit is electrically connected with the third input terminal, and the second power supply terminal of the control unit is electrically connected with the zero line input terminal.

In one embodiment, the controller further comprises a voltage detection unit, an input end of the voltage detection unit is electrically connected with the first end of the first capacitor or the first end of the second capacitor, the voltage detection unit can detect the voltage of the first end of the first capacitor or the voltage of the first end of the second capacitor and send a detection signal to the control unit, and the control unit can control the first switch tube, the second switch tube and the third switch tube to work at least according to the detection signal.

In one embodiment, the control unit is preset with a voltage threshold, and the control unit can determine whether the detection signal is greater than or equal to the voltage threshold; and when the detection signal is greater than or equal to the voltage threshold, the first capacitor and/or the second capacitor is characterized to be charged completely.

In one embodiment, the controller further comprises a timing unit, a time threshold is set in the timing unit or the control unit, and the timing unit starts timing from the time when the controller is powered on; and when the timing duration reaches the time threshold, representing that the charging of the first capacitor and/or the second capacitor is completed.

In one embodiment, the controller further comprises a single-phase load unit, wherein a first power supply terminal of the single-phase load unit is electrically connected with the second end of the first switching tube or the second end of the second switching tube; the second power supply terminal of the single-phase load unit is electrically connected with the zero line input terminal; the single-phase load unit can control the working state of a valve device of an air conditioning system or a heating bag of a compressor.

In one embodiment, the controller further comprises a single-phase load unit, wherein the first power supply terminal of the single-phase load unit is electrically connected with the third input terminal, the second power supply terminal of the single-phase load unit is electrically connected with the zero line input terminal, and the single-phase load unit can control the working state of a valve device or a compressor heating bag of an air conditioning system.

In one embodiment, the controller is capable of controlling an air conditioning compressor; the controller further comprises an inversion unit, wherein the input terminal of the inversion unit is electrically connected with the first output terminal and the second output terminal respectively, and the output end of the inversion unit can be electrically connected with the air conditioner compressor.

In one embodiment, the control unit has at least two control signal output terminals, one of the control signal output terminals is electrically connected to the control terminals of the first switch tube and the second switch tube, and the other control signal output terminal is electrically connected to the control terminal of the third switch tube.

In one embodiment, the first switch tube is a contactor, a relay, an IGBT (Insulated Gate Bipolar Transistor) or a thyristor; the second switch tube is a contactor, a relay, an IGBT or a thyristor; the third switching tube is a contactor, a relay, an IGBT or a thyristor.

The embodiment of the application also provides an air conditioning device, which comprises an outdoor unit, wherein the outdoor unit comprises the controller and the air conditioning compressor, the controller comprises an inverter unit, and the output end of the inverter unit is electrically connected with the air conditioning compressor.

The embodiment of the application provides a controller and an air conditioner device, which are suitable for an input power supply comprising three-phase input alternating current and a zero line, and comprise a first input terminal, a second input terminal, a third input terminal, a zero line input terminal, a three-phase rectifier bridge, a first capacitor, a second capacitor, a first switch tube, a second switch tube, a third switch tube, a first resistor and a control unit; a first end of a first capacitor is electrically connected with the first output terminal, a second end of the first capacitor is electrically connected with a first end of a second capacitor, a second end of the second capacitor is electrically connected with the second output terminal, and the first capacitor and the second capacitor are called as bus capacitors; the first switch tube and the second switch tube are connected between any two-phase electricity (called as a first phase and a second phase) and the three-phase rectifier bridge, the third switch tube and the first resistor are connected between the third phase and the bus capacitor, after the controller is powered on and before the first capacitor and/or the second capacitor are charged, the third phase electricity charges the bus capacitor through the third switch tube and the first resistor, the bus capacitor can be protected, and after the bus capacitor is charged, the first switch tube and the second switch tube are controlled to be closed and the third switch tube is controlled to be opened, so that the working efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present invention, the drawings required to be used in the description of the embodiments or the background art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a block circuit diagram of a controller disclosed herein;

FIG. 2 is a schematic circuit diagram of a controller according to an embodiment of the present disclosure;

FIG. 3 is a schematic circuit diagram of a controller according to another embodiment of the present disclosure;

FIG. 4 is a schematic circuit diagram of a controller according to another embodiment of the present disclosure;

fig. 5 is a schematic circuit diagram of a controller according to another embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

With the improvement of energy-saving and environment-friendly requirements, the requirements for standby power consumption of each electrical device are higher and higher, and people expect low standby power consumption to realize energy conservation and emission reduction, fig. 1 is a control circuit disclosed in the present application, and is applicable to a three-phase power supply, in the circuit, a first capacitor C1 and a second capacitor C2 are arranged behind a three-phase rectifier bridge 10, the first capacitor C1 and the second capacitor C2 are connected in series at the output end of the three-phase rectifier bridge 10, the first capacitor C1 and the second capacitor C2 are also called as bus capacitors or direct current capacitors, in order to protect the bus capacitors, a pre-charging circuit needs to be arranged, after power is turned on, the bus capacitors are firstly charged through the pre-charging circuit, and damage to a rear-stage circuit or a rear-stage load or a direct current capacitor caused by strong impact current after power is turned on is avoided. In fig. 1, the precharge circuit includes a resistor R11 and a switch tube K12 connected in series. However, with the requirement of standby power consumption of electrical equipment in various countries, the whole circuit also needs to have standby power consumption as low as possible; therefore, the switching tube K11 is connected in parallel to the series branch of the resistor R11 and the switching tube K12. After electrification and before the bus capacitor is charged, the switching tube K12 is controlled to be closed, and the output voltage of the three-phase rectifier bridge DB charges the bus capacitor through the resistor R11; after charging is finished, the switch tube K12 is controlled to be disconnected, the switch tube K11 is controlled to be closed, and the controller works normally; and when the controller is in standby, the switch tube K12 is controlled to be opened and the switch tube K11 is controlled to be closed, so that the requirement of low standby power consumption is met. However, in such a low power consumption circuit design, since a current path still exists between the three-phase power supply, the three-phase rectifier bridge DB, the switching tube K11, and the bus capacitor, there is still high standby power consumption.

Based on this, the embodiment of the present application provides a controller, which is different from the circuit topology described in the background art, and is capable of protecting a bus capacitor when being powered on, and is particularly suitable for a three-phase four-wire system input power supply, as shown in fig. 2, the controller includes a first input terminal R, a second input terminal S, a third input terminal T, a zero-line input terminal N, a three-phase rectifier bridge 10, a first capacitor C1, a second capacitor C2, a first switch tube SW1, a second switch tube SW2, a third switch tube SW3, a first resistor R1, and a control unit 11; when the controller is powered on or in standby, the first input terminal R, the second input terminal S and the third input terminal T are respectively and electrically connected with a three-phase power supply one by one.

The three-phase rectifier bridge 10 is a common device or consists of 6 discrete diodes D1, D2, D3, D4, D5 and D6, the input side of the three-phase rectifier bridge 10 comprises a first input terminal B1, a second input terminal B2 and a third input terminal B3, and the output side of the three-phase rectifier bridge 10 comprises a first output terminal A and a second output terminal B; the first input terminal R is electrically connected to a first end of the first switch tube SW1, and a second end of the first switch tube SW1 is electrically connected to the first input terminal B1; the second input terminal S is electrically connected to the first end of the second switch tube SW2, and the second end of the second switch tube SW2 is electrically connected to the second input terminal B2; the third input terminal T is electrically connected to the third input terminal B3; that is, any two phases of the three-phase power may be electrically connected to any two input terminals of the three-phase rectifier bridge through the first switching tube SW1 and the second switching tube SW2, respectively, and the other phase of the three-phase power may be directly electrically connected to the other input terminal of the three-phase rectifier bridge.

A first end of the first capacitor C1 is electrically connected to the first output terminal a, a second end of the first capacitor C1 is electrically connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is electrically connected to the second output terminal B; the first capacitor C1 and the second capacitor C2 are also referred to as bus capacitors; specifically, the first output terminal a may be an output high-voltage end of a three-phase rectifier bridge, the second output terminal B may be an output low-voltage end of the three-phase rectifier bridge, the first capacitor and the second capacitor may be electrolytic capacitors, first ends of the first capacitor and the second capacitor are positive polarity ends of the electrolytic capacitors, and second ends of the first capacitor and the second capacitor are negative polarity ends of the electrolytic capacitors; the neutral line input terminal N is electrically connected with a first end of a third switching tube SW3, a second end of the third switching tube SW3 is electrically connected with a first end of a first resistor R1, and a second end of a first resistor R1 is electrically connected with a second end of the first capacitor C1;

the control signal output end of the control unit 11 is electrically connected to the control ends of the first switch tube SW1, the second switch tube SW2 and the third switch tube SW 3; specifically, after the controller is powered on, the control unit 11 can at least control the third switching tube SW3 to be closed and the first switching tube SW1 and the second switching tube SW2 to be opened in advance until the first capacitor C1 and/or the second capacitor C2 are charged; after the first capacitor C1 and/or the second capacitor C2 are charged, the control unit 11 can at least control the third switch tube SW3 to be opened, the first switch tube SW1 and the second switch tube SW2 to be closed, and the controller works normally. That is, after the controller is powered on, the control unit 11 sends a close control signal to the third switching tube SW3 to control the third switching tube SW3 to close, and sends an open control signal to the first switching tube SW1 and the second switching tube SW2 to control the first switching tube SW1 and the second switching tube SW2 to open, until the charging of the first capacitor C1 and/or the second capacitor C2 is completed; after the first capacitor C1 and/or the second capacitor C2 are charged, the control unit 11 sends an open control signal to the third switch tube SW3 to control the third switch tube SW3 to open, and sends a close control signal to the first switch tube SW1 and the second switch tube SW2 to control the first switch tube SW1 and the second switch tube SW2 to close. Specifically, the control unit may include a control chip, such as an MCU, and the control chip may output a close control signal or a close control signal to each switching tube, where the close control signal and the close control signal may be high and low level signals. The power-on means that the controller is connected to an input power supply, that is, the first input terminal R, the second input terminal S, the third input terminal T and the zero line input terminal N of the controller are electrically connected to the three-phase input line and the zero line, respectively.

In this embodiment, after power-on, the third switch tube SW3 is closed, the first switch tube SW1 and the second switch tube SW2 are opened until the bus capacitor is charged and the controller works normally, and in this process, when the T-phase voltage accessed by the third input terminal T is in a positive half cycle, the T-phase voltage passes through the diode D3, and a path is formed between the first capacitor C1, the first resistor R1, the third switch tube SW3 and the zero line input terminal N to charge the first capacitor C1; when the T-phase voltage is at a negative half cycle, a path is formed between the neutral line input terminal N → SW3 → R1 → the second capacitor → D4 → the third input terminal T to charge the second capacitor; due to the existence of the resistor R1, the bus capacitor can be protected, and therefore damage to a rear-stage circuit or a rear-stage load or the bus capacitor caused by strong impact current during electrification is avoided. After the first capacitor and/or the second capacitor are charged, the SW3 is opened, the SW1 and the SW2 are closed, the controller works normally, and the working efficiency of the controller can be improved by cutting off the first resistor R1. Specifically, the control Unit may include an MCU (Microcontroller Unit), i.e., the control signal output from the control signal output terminal of the MCU is used to control the operating states of SW1, SW2 and SW 3.

Further, as shown in fig. 3, the power supply of the control unit is from the third input terminal T, no switching tube is connected between the third input terminal T and the third input terminal B3 of the three-phase rectifier bridge 10, and when the controller is in the standby state, the phase voltage connected to the third input terminal T is charged, and the arrangement is such that the control unit 11 does not power down in the standby state; in particular, it may be provided that the first power supply terminal of the control unit is electrically connected to the third input terminal, and the second power supply terminal of the control unit is electrically connected to the neutral input terminal, i.e. the power supply of the control unit is derived from the voltage difference between the phase voltage and the neutral voltage connected to the third input terminal. When the controller is in the standby state, the control unit 11 is still in the charged state, and at this time, the control unit 11 can control the first switching tube SW1, the second switching tube SW2 and the third switching tube SW3 to be turned off; the standby state means that the controller is electrically connected to the input power source, but the controller is not operated. In this embodiment, in the standby state, SW1/SW2/SW3 are all turned off, no current flows through the main loop, and the standby power consumption is very low. When the controller is switched from the standby state to the operating state, the control unit 11 is not powered down, so that the control function can be implemented, specifically, when receiving an instruction to switch from the standby state to the operating state, the control unit 11 can control the third switching tube SW3 to be closed in advance, and control the first switching tube SW1 and the second switching tube SW2 to be still open until the charging of the first capacitor C1 and/or the second capacitor C2 is completed; after the first capacitor C1 and/or the second capacitor C2 are charged, the control unit 11 controls the third switching tube SW3 to be open, the first switching tube SW1 and the second switching tube SW2 to be closed, and the controller enters a working state and works normally.

In one embodiment, in order to determine whether the bus capacitor is completely charged, a voltage detection unit 12 is further disposed in the controller, as shown in fig. 4, an input end of the voltage detection unit 12 is electrically connected to the first end of the first capacitor C1 or the first end of the second capacitor C2, the voltage detection unit can detect the voltage of the first end of the first capacitor C1 or the voltage of the first end of the second capacitor C2, and send a detection signal to the control unit 11, and the control unit 11 can control the first switch tube SW1, the second switch tube SW2, and the third switch tube SW3 to operate at least according to the detection signal. In this embodiment, the voltage detection unit may be a common voltage sampling unit, such as a voltage division sampling unit through a resistor, or may be another voltage sampling method, so as to obtain a detection signal; the first capacitor and/or the second capacitor are connected in series, and whether the bus capacitor is charged or not can be judged by using the voltage at the first end of the first capacitor or the voltage at the first end of the second capacitor, so that the control unit 11 can control the working states of the SW1, the SW2 and the SW3 according to a detection signal representing the voltage signal. Further, the control unit 11 is preset with a voltage threshold, and the control unit 11 can determine whether the detection signal is greater than or equal to the voltage threshold; when the detection signal is greater than or equal to a voltage threshold, it is characterized that the charging of the first capacitor C1 and the second capacitor C2 is completed. The voltage detection unit 12 may be provided integrally with the control unit 11.

In this embodiment, after power-on and before charging of the bus capacitor is completed, the detection signal is smaller than the preset voltage threshold, at this time, the control unit 11 controls the SW3 to be closed and the SW1 and SW2 to be opened, and the T-phase power supply charges the bus capacitor through the resistor R1; and when the bus capacitor is charged, the detection signal is greater than the preset voltage threshold, the control unit controls the SW3 to be switched off, and the SW1 and the SW2 to be switched on, and the controller works normally. When the controller is in the standby state, the control unit 11 controls the SW1, the SW2 and the SW3 to be in the off state, and at this time, the main loop is in the off state, no current flows, and the standby power consumption is extremely low.

In another embodiment, in order to ensure that the bus capacitor is charged completely, the time parameter can be directly used for judging, and the bus capacitor is charged completely within a certain time period T1 after the controller is powered on, that is, the bus capacitor is charged completely; and duration T1 can be obtained by experiment or calculation, and its size is relevant with bus capacitance size, the resistance of first resistance R1, and the concrete calculation of duration T1 can be obtained according to the charge formula of electric capacity, and this application is not repeated here. Based on this, as shown in fig. 5, in the present embodiment, a timing unit 13 is provided, a time threshold is provided in the timing unit 13 or the control unit 11, and the timing unit 13 starts timing from the time when the controller is powered on; when the timing duration reaches the time threshold, the first capacitor C1 and the second capacitor C2 are characterized to be charged completely. Specifically, when the power-on time of the controller does not reach the time threshold, the bus capacitor is represented to be not charged completely, at this time, the control unit controls the switch SW3 to be switched on and the switch SW1 and the switch SW2 to be switched off, and the T-phase power supply charges the bus capacitor through the resistor R1; when the power-on time of the controller reaches the time threshold, the control unit controls the SW3 to be opened and the SW1 and the SW2 to be closed, and the controller works normally. When the controller is in the standby state, the control unit 11 controls the SW1, the SW2 and the SW3 to be in the off state, and at this time, the main loop is in the off state, no current flows, and the standby power consumption is extremely low. In this embodiment, the timing unit and the control unit may be integrated in the MCU.

The controller provided by any one of the above embodiments can be used for controlling an air conditioner, specifically, at least an air conditioner compressor; this air conditioner belongs to the three-phase four-wire system input, and at this moment, as shown in fig. 5, the controller still includes inverter unit 14, inverter unit 14's input terminal is connected electrically respectively first output terminal A, second output terminal B, inverter unit 14's output can be connected electrically air condition compressor, and this application does not do the restriction to the concrete control mode of compressor, specifically can be common control, for example Space Vector Pulse Width Modulation (SVPWM) control etc..

Further, when the controller is used for controlling an air conditioner, the controller may further be provided with a single-phase load unit 15, as shown in fig. 4 or 5, in fig. 4, the power supply of the control unit 11 is directly from the voltage between the third input terminal T and the zero line, and when the controller is in standby, the voltage exists between the third input terminal T and the zero line, that is, when the controller is in standby, the control unit 11 is electrified. At this time, in order to further reduce the power consumption of the controller, the first power supply terminal of the single-phase load unit 15 may be electrically connected to the second terminal of the first switching tube SW1 or the second terminal of the second switching tube SW 2; the second power supply terminal of the single-phase load unit 15 is electrically connected to the neutral input terminal N. The single-phase load unit 15 can control the operation state of a valve-like device of an air conditioning system or a compressor heating bag. The air conditioning system not only includes an air conditioning compressor, but also includes valve devices, such as an electronic expansion valve, a reversing valve, etc., which also need to be controlled, and in this embodiment, the single-phase load unit 15 is used to control and supply power to the valve devices. In some air conditioning systems, the air conditioning compressor may further be provided with a heating bag, and when the temperature is low, the heating bag is required to be used for heating the air conditioning compressor and then controlling the compressor, and in this embodiment, the control on the heating bag may also be controlled and powered by the single-phase load unit 15.

In this embodiment, the single-phase load unit 15 is powered by a single-phase power supply, and is powered by the voltage of the first switching tube SW1 or the second switching tube SW 2; since both SW1 and SW2 are turned off during standby, the single-phase load power supply is also in a power-off state during standby, and the standby power consumption of the single-phase load power supply can be further reduced, thereby reducing the standby power consumption of the entire controller.

Further, as shown in fig. 5, when the controller is provided with the single-phase load unit 15, the control unit 11 may be provided to be supplied with power from the single-phase load unit 15; at this time, in order to satisfy the requirement that the control unit 11 is charged in the standby state, it is necessary to provide: the first power supply terminal of the single-phase load unit 15 is electrically connected to the third input terminal, and the second power supply terminal of the single-phase load unit is electrically connected to the zero line input terminal, that is, the power of the single-phase load unit 15 is directly derived from the voltage between the third input terminal T and the zero line, but no switching tube is arranged between the third input terminal and the three-phase rectifier bridge; in standby mode, a voltage exists between the third input terminal T and the zero line, and at this time, the single-phase load unit is also charged, so that the control unit 11 is also charged. Therefore, when the controller is switched from the standby state to the working state, because the control unit 11 is not powered down, the control function can be implemented, specifically, when receiving an instruction to switch from the standby state to the working state, the control unit 11 can control the third switching tube SW3 to be closed in advance, and control the first switching tube SW1 and the second switching tube SW2 to be still opened until the charging of the first capacitor C1 and/or the second capacitor C2 is completed; after the first capacitor C1 and/or the second capacitor C2 are charged, the control unit 11 controls the third switching tube SW3 to be open, the first switching tube SW1 and the second switching tube SW2 to be closed, and the controller enters a working state and works normally. Also, the single-phase load unit 15 is provided to be able to control the operation state of a valve-like device of an air conditioning system or a compressor heating bag.

In one embodiment, the power supply terminals of the control unit and the single-phase load unit are both connected to the third input terminal and the zero line input terminal, which indicates that the power supplies of the control unit and the single-phase load unit are both from the voltage between the third input terminal T and the zero line; of course, if the circuit has an adapted voltage available for the control unit, the voltage is only required to be input to the control unit, and a secondary winding is not required to be led out for supplying power.

Further, the timing unit 14 needs a weak power supply to be operable. The voltage detection unit 12 may also use an active device to perform voltage detection, and the power supply of the voltage detection unit 12 and the control unit 11 may sample the same power supply, and specifically, the required working voltage may also be obtained by performing a flyback voltage reduction design on the bus voltage or the power supply voltage of the single-phase load unit.

In the above embodiment, the operation states of SW1 and SW2 are always the same, and the operation state of SW3 is sometimes the same and sometimes opposite, so in one embodiment, the control unit 11 may be provided with at least 2 control signal output terminals, wherein one of the control signal output terminals is electrically connected to the control terminals of the first switch tube SW1 and the second switch tube SW2, and the other control signal output terminal is electrically connected to the control terminal of the third switch tube SW 3. Of course, the control unit 11 may also have 3 control signal output terminals, and the 3 control signal output terminals are electrically connected to the control terminals of the first switch tube SW1, the second switch tube SW2 and the third switch tube SW3, respectively, to control them.

In this embodiment, the first switch SW1 may be configured as a contactor, a relay, an IGBT (Insulated Gate Bipolar Transistor) or a thyristor; likewise, the second switch tube SW2 may also be configured as a contactor, a relay, an IGBT or a thyristor; likewise, the third switching tube SW3 may also be provided as a contactor, a relay, an IGBT or a thyristor. In one embodiment, when the control unit 11 outputs a high level signal to the first/second/third switch tubes, the first/second/third switch tubes are closed, that is, the close control signal is a high level signal, and the close control signal is a low level control signal. According to the driving type or circuit design of the switching tube, the condition that the closing control signal is a low-level signal and the closing control signal is a high-level control signal also exists; that is, the specific turn-off control signal and turn-on control signal are determined by the switching characteristics of each switching tube, and this is not specifically limited in the present application.

It should be noted that the electrical connection in this document includes a direct electrical connection and also includes an indirect electrical connection, that is, there are other electrical devices, such as a resistor, between the two.

Based on the controller, the embodiment of the present application further provides an air conditioning apparatus, the air conditioning apparatus includes an outdoor unit, the outdoor unit further includes the controller and the air conditioning compressor as described above, as shown in fig. 5, the controller includes an inverter unit 111, and an output end (U/V/W) of the inverter unit 111 is electrically connected to the air conditioning compressor, so as to control the air conditioning compressor.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A controller is characterized by comprising a first input terminal, a second input terminal, a third input terminal, a zero line input terminal, a three-phase rectifier bridge, a first capacitor, a second capacitor, a first switching tube, a second switching tube, a third switching tube, a first resistor and a control unit;

the three-phase rectifier bridge comprises a first input terminal, a second input terminal, a third input terminal, a first output terminal and a second output terminal; the first input terminal is electrically connected with a first end of the first switch tube, and a second end of the first switch tube is electrically connected with the first input terminal; the second input terminal is electrically connected with a first end of the second switch tube, and a second end of the second switch tube is electrically connected with the second input terminal; the third input terminal is electrically connected to the third input terminal;

a first end of the first capacitor is electrically connected with the first output terminal, a second end of the first capacitor is electrically connected with a first end of the second capacitor, and a second end of the second capacitor is electrically connected with the second output terminal; the zero line input terminal is electrically connected with a first end of the third switching tube, a second end of the third switching tube is electrically connected with a first end of the first resistor, and a second end of the first resistor is electrically connected with a second end of the first capacitor; the control signal output end of the control unit is electrically connected to the control ends of the first switching tube, the second switching tube and the third switching tube; and the first power supply terminal of the control unit is electrically connected with the third input terminal, and the second power supply terminal of the control unit is electrically connected with the zero line input terminal.

2. The controller according to claim 1, further comprising a voltage detection unit, wherein an input end of the voltage detection unit is electrically connected to the first end of the first capacitor or the first end of the second capacitor, and is capable of detecting a voltage of the first end of the first capacitor or a voltage of the first end of the second capacitor and sending a detection signal to the control unit, and the control unit is capable of controlling the first switch tube, the second switch tube and the third switch tube to operate at least according to the detection signal.

3. The controller according to claim 2, wherein a voltage threshold is preset in the control unit, and the control unit is capable of determining whether the detection signal is greater than or equal to the voltage threshold; and when the detection signal is greater than or equal to the voltage threshold, the first capacitor and/or the second capacitor is characterized to be charged completely.

4. The controller according to claim 1, further comprising a timing unit, wherein a time threshold is set in the timing unit or the control unit, and the timing unit starts timing from the time when the controller is powered on; and when the timing duration reaches the time threshold, representing that the charging of the first capacitor and/or the second capacitor is completed.

5. The controller of claim 1, further comprising a single-phase load unit, wherein a first power supply terminal of the single-phase load unit is electrically connected to the second end of the first switching tube or the second end of the second switching tube; the second power supply terminal of the single-phase load unit is electrically connected with the zero line input terminal; the single-phase load unit can control the working state of a valve device of an air conditioning system or a heating bag of a compressor.

6. The controller according to claim 1, further comprising a single-phase load unit, wherein the first power supply terminal of the single-phase load unit is electrically connected to the third input terminal, the second power supply terminal of the single-phase load unit is electrically connected to the neutral input terminal, and the single-phase load unit is capable of controlling the operation state of a valve device of an air conditioning system or a compressor heating bag.

7. The controller of any one of claims 1-6, wherein the controller is capable of controlling an air conditioning compressor; the controller further comprises an inversion unit, wherein the input terminal of the inversion unit is electrically connected with the first output terminal and the second output terminal respectively, and the output end of the inversion unit can be electrically connected with the air conditioner compressor.

8. The controller according to claim 1, wherein the control unit has at least 2 control signal output terminals, one of the control signal output terminals is electrically connected to the control terminals of the first switch tube and the second switch tube, and the other control signal output terminal is electrically connected to the control terminal of the third switch tube.

9. The controller of claim 8, wherein the first switch tube is a contactor, a relay, an insulated gate bipolar transistor, or a thyristor; the second switch tube is a contactor, a relay, an IGBT or a thyristor; the third switching tube is a contactor, a relay, an IGBT or a thyristor.

10. An air conditioning apparatus, comprising an outdoor unit, wherein the outdoor unit comprises the controller of any one of claims 1 to 6 or claim 8 or claim 9 and an air conditioning compressor, the controller comprises an inverter unit, and an output end of the inverter unit is electrically connected to the air conditioning compressor.

11. An air conditioning apparatus comprising an outdoor unit including the controller of claim 7 and an air conditioning compressor.

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