A low-power power supply system and an air conditioner

Abstract

The present invention provides a low-power power supply system and an air conditioner. The low-power power supply system includes an indoor unit and an outdoor unit. The indoor unit includes a first power module, a first control module, and a first switch module connected to each other. The outdoor unit includes a second switch module and a connected wake-up circuit, a second power module, and a second control module. The second switch module is connected in parallel with the wake-up circuit. The first power module is electrically connected to the first switch module and the wake-up circuit in sequence. The second control module is electrically connected to the second switch module and the wake-up circuit respectively. The low-power power supply system of the present invention adds a new wake-up circuit based on capacitive voltage step-down, which can effectively step down the voltage, avoid the impact of strong electricity on the wake-up circuit directly, and is safer and more reliable, especially in the case of unstable voltage; the on-off of the live wire of the outdoor unit is controlled by a relay to achieve low-power standby, wake-up, and communication functions.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more particularly, to a low-power power supply system and an air conditioner. Background Art

[0002] With the improvement of living standards, air conditioners have entered thousands of households, office places and public places, and are even applied to various means of transportation, becoming a necessity in modern daily life, which can prevent heatstroke and provide a comfortable rest and working environment. In order to meet the needs of the times and promote technological progress, the country has put forward higher requirements for the energy efficiency standards of electrical equipment; the energy consumption indicators of air conditioners have received more attention.

[0003] At present, when ordinary air conditioners are in standby, the circuits of the indoor unit and the outdoor unit are both powered on, and the voltage conversion circuit therein still continues to work, generating additional power consumption, resulting in some energy waste and high energy consumption. In response to the country's energy-saving requirements, many air-conditioning enterprises have changed the linear power supply of the indoor unit circuit to a switching power supply to reduce the standby power of the power supply module of the indoor unit. However, this only reduces the standby power consumption of the indoor unit circuit, while the power supply of the outdoor unit circuit and the power consumption of other working modules are very large. On the other hand, the external machine wake-up power supply used in the current air-conditioning standby power consumption control circuit directly leads alternating current from the indoor unit to the outdoor unit through a communication line, and the circuit structure is complex; at the same time, the electrical stress borne by the components used in the communication circuit is relatively large, and the requirements for the components are high; the requirements for electrical safety are relatively high, and there are potential safety hazards.

[0004] In view of the problem that the electrical stress borne by the components used in the communication circuit is relatively large and the wake-up circuit is prone to failure, the current air-conditioning industry has not proposed an effective solution. Summary of the Invention

[0005] The present invention aims to solve the above problems. Under the architecture of the existing live-neutral communication circuit, a wake-up circuit using a resistor-capacitor step-down method is adopted to achieve low-power standby, wake-up and communication functions, improve the ability of the communication power supply itself, and be compatible with indoor and outdoor unit power supply models, which is safer and more reliable.

[0006] To solve the above problems, the present invention provides a low-power power supply system, including an indoor unit and an outdoor unit, characterized in that the indoor unit includes a first power module, a first control module and a first switch module connected in sequence, the outdoor unit includes a second switch module and a wake-up circuit, a second power module and a second control module connected in sequence, the second switch module is connected in parallel with the wake-up circuit, the first power module is electrically connected to the first switch module and the wake-up circuit in sequence, and the second control module is electrically connected to the second switch module and the wake-up circuit respectively. Preferably, the second switch module includes a relay. The first power module and the second power module are prior arts and will not be described in detail herein.

[0007] The first control module is used to control the state of the first switch module; the wake-up circuit includes a voltage step-down module and a relay connected to each other. The first switch module is electrically connected to the second power module in series with the normally open contact of the relay. The relay is used to close in response to the wake-up signal to wake up the second control module; the second control module is used to control the second switch module to close after being woken up so that the outdoor unit works normally.

[0008] Generally, the power supply mode of an air conditioner can be divided into indoor unit power supply and outdoor unit power supply. For an air conditioner with outdoor unit power supply, its main control board is located in the outdoor unit, and the indoor unit only includes a relatively simple indoor unit circuit board. Moreover, most outdoor unit power supplies use 380V three-phase electricity; while for an air conditioner with indoor unit power supply, its main control board is installed in the indoor unit. When receiving a startup instruction, the first control module of the indoor unit controls the first switch to switch to the second state so that the first control module is electrically connected to the wake-up circuit, and transmits the generated wake-up signal to the wake-up circuit through the first switch module and the first communication circuit to wake up the second control module. At the same time, the second control module controls the second switch module to close and controls the wake-up circuit to disconnect after being woken up so that the outdoor unit works normally; at other times, due to the existence of the first switch module and the wake-up circuit, the first power module cannot be directly connected to the second power module and supply power to the second control module, making both the indoor unit loop and the outdoor unit loop in an open circuit state, which can effectively reduce the power consumption of the power supply system during standby. An optocoupler is provided in the wake-up circuit and is directly connected to the emphasis, with high voltage requirements; by setting a voltage step-down module, effective voltage reduction can be achieved to avoid the impact of strong electricity on the wake-up circuit directly.

[0009] Preferably, the wake-up circuit further includes a first optocoupler, a first switching tube, and a second switching tube. The first end of the first optocoupler electrically connects the first switch module to the emitter and base electrode of the second switching tube respectively. The collector of the second switching tube is connected to one end of the relay. At the same time, the collector of the second switching tube is connected to the N terminal of the electrical power module; the second end of the first optocoupler electrically connects the voltage step-down module to the collector and base electrode of the first switching tube respectively. The emitter of the first switching tube is connected to the other end of the relay.

[0010] The first switching tube is used to cooperate with the voltage step-down module to adjust the voltage and current of the relay; the second switching tube is used to conduct in response to the wake-up signal to power on the relay; the relay is used to control the normally open contact of the relay to close after being powered on so that the first power module is electrically connected to the second power module, and the second control module is powered by the second power module to wake up the second control module.

[0011] When receiving the power-on instruction, the first control module controls the first switch module to switch to the second state, and successively closes the switch of the relay through the first diode, the third resistor, the first optocoupler, and the second switching tube, and finally conducts the first power module and the second power module to supply power to the second control module to wake up the second control module. However, when the wake-up circuit structure is relatively complex, it is unstable during long-term power-on and consumes a large amount of power. To ensure the normal operation of the outdoor unit, the second control module is also used to control the second switch module to close after being woken up, so that the first power module can continuously supply power to the second control module through the second power module to ensure the normal operation of the outdoor unit. The method of waking up the outdoor unit only when starting up can effectively reduce the power consumption of the power supply system during standby.

[0012] Preferably, the wake-up circuit further includes a second resistor, a second diode, and a first voltage regulator. One end of the second resistor is connected to the first optocoupler, and the other end of the second resistor is disposed between the base electrode of the first switching tube and the second diode. The second diode is respectively connected to the base electrode of the first switching tube and one end of the relay. The first voltage regulator is respectively connected to one end of the second diode close to the relay and the emitter of the first switching tube. At the same time, the second diode and the first voltage regulator are respectively connected to the N terminal of the first power module. By setting the second diode, the current at the N terminal of the first power module or the current in the relay loop can be prevented from flowing to the base electrode of the first switching tube. By setting the first voltage regulator and the second resistor, the voltage value output by the second switching tube to the relay can be effectively stabilized, so as to ensure that the relay can be powered on stably and at the same time ensure the minimum drive current of the relay to avoid overcurrent. In addition, the first voltage regulator can also prevent the first switching tube from being damaged by large current when the power distribution line is reversely connected.

[0013] Preferably, the wake-up circuit further includes a second optocoupler. The second control module is connected to the first end of the second optocoupler and controls its on / off. The second end of the second optocoupler connects the first switch module and the base electrode of the second switching tube. This setting enables the wake-up signal generated by the first control module and the exit wake-up signal generated by the second control module to be controlled separately, avoiding interference and having a clear control logic.

[0014] Preferably, an eighth resistor is further provided between the base electrode of the second switching transistor and the second optocoupler, a fourth resistor is provided between the first optocoupler and the base electrode of the second switching transistor, and a seventh resistor is further provided between the second optocoupler and the collector electrode of the second switching transistor. That is to say: the emitter of the second switching transistor is arranged between the fourth resistor and the first optocoupler, and the seventh resistor is connected to the N terminal of the first power supply module. This setting can prevent the currents of the base electrode, collector electrode, and emitter of the second switching transistor from reaching the required values and thus not conducting when the second optocoupler is conducting, ensuring that the first optocoupler cannot conduct to disconnect the relay.

[0015] Preferably, the buck module includes a resistor-capacitor buck circuit formed by a first resistor and a first capacitor connected in parallel. This setting effectively stabilizes the voltage value of the wake-up circuit, avoids strong current impact on the wake-up circuit, and ensures that the relay can be powered on stably.

[0016] Preferably, the indoor unit further includes a first communication circuit, and the outdoor unit further includes a second communication circuit. The first switch module, the first communication circuit, and the wake-up circuit are electrically connected in sequence. The second communication circuit is connected to the second control module and is used to control the on / off of the wake-up circuit and the second switch module after being woken up; the first control module is further used to control the first switch module to switch to the first state after the second control module is woken up. When the second control module is woken up, by controlling the disconnection of the wake-up circuit, the wake-up circuit can be made open circuit to avoid the wake-up circuit affecting the data transmission of the outdoor unit; at the same time, the first switch module is switched to the first state, so that the first power supply module is directly connected to the second power supply module without passing through the first communication module, and the first communication module only plays the role of data transmission between the indoor unit and the outdoor unit.

[0017] Preferably, the second control module is further used to control the disconnection of the second switch module to stop transmitting operation data to the first control module when receiving a shutdown instruction; the first control module is further used to control the first switch module to switch to the third state when the operation data transmitted from the outdoor unit is not received within a preset time. After receiving the shutdown instruction, the second switch module is controlled to disconnect, causing the second control module to lose power and the outdoor unit to malfunction, ensuring low power consumption when the outdoor unit is on standby; at the same time, when the first control module does not receive operation data within a certain time, it controls the switch module to switch to the third state to make the indoor unit in an open circuit state, thereby reducing the power consumption of the indoor unit when on standby.

[0018] Preferably, the first switch module includes a single-pole double-throw switch. The movable end of the single-pole double-throw switch is electrically connected between the wake-up circuit and the L terminal of the first power supply module. The first fixed end of the single-pole double-throw switch is electrically connected to the N terminal of the first power supply module through a voltage stabilizing circuit. The second fixed end of the single-pole double-throw switch is electrically connected to the other end of the first communication circuit. Wherein, when the movable end of the single-pole double-throw switch is connected to the second fixed end, the first switch module is in the second state. When the movable end of the single-pole double-throw switch is connected to the first fixed end, the first switch module is in the first state. Preferably, one end of the voltage stabilizing circuit is electrically connected to the N terminal of the first power supply module, and the other end of the voltage stabilizing circuit is electrically connected to the first switch module. This setting can effectively stabilize the voltage between the N terminal and the L terminal of the first power supply module.

[0019] Compared with the prior art, the low-power power supply system of the present invention has the following beneficial effects: (1) The low-power power supply system of the present invention adds a new wake-up circuit based on capacitive voltage reduction to judge the voltage, and controls the on-off of the external machine live wire through a relay to achieve low-power standby, wake-up and communication functions, protect the communication circuit, and reserve jumpers and change the wiring on the circuit. Without re-designing or changing the board, it can be compatible with the models of external machine power supply and internal machine power supply; (2) The live wire is connected to the wake-up circuit through the capacitive voltage reduction method, which can effectively step down the voltage and avoid the impact of strong electricity on the wake-up circuit directly, making it safer and more reliable, especially in the case of unstable voltage; (3) Two optocouplers are used to control the wake-up and wake-up exit signals respectively to avoid interference and make the control logic clear; (4) The combination of the second resistor, the first switch tube, the second diode, and the first voltage stabilizing tube accurately stabilizes the voltage across the relay to the working voltage, ensures the minimum drive current of the relay, and will not cause overcurrent, thus improving the service life.

[0020] The present invention also provides an air conditioner, and the air conditioner includes the above-mentioned low-power power supply system. The air conditioner has the same beneficial effects as the low-power power supply system, which will not be elaborated here. Description of the Drawings

[0021] Figure 1 It is a circuit structure block diagram of the low-power power supply system described in the embodiment of the present invention;

[0022] Figure 2 It is the circuit diagram of the low-power power supply system described in the embodiment of the present invention;

[0023] Figure 3 It is another circuit structure block diagram of the low-power power supply system described in the embodiment of the present invention;

[0024] Figure 4This is the circuit diagram of the low-power power supply system according to the embodiments of the present invention.

[0025] Description of reference numerals:

[0026] 1 - Indoor unit; 11 - First control module; 12 - First power module; 13 - First switch module; 14 - Voltage stabilizing circuit; 15 - First communication circuit; 2 - Outdoor unit; 21 - Wake-up circuit; 22 - Second communication circuit; 23 - Second power module; 24 - Second control module; 25 - Second switch module; 26 - Voltage stabilizing module; K1 - Single-pole double-throw switch; C1 - First capacitor; C5 - Fifth capacitor; Q1 - First switch tube; Q2 - Second switch tube; RY1 - Relay; D1 - First diode; D2 - Second diode; D4 - Fourth diode; D5 - Fifth diode; ZD1 - First voltage stabilizing tube; ZD2 - Second voltage stabilizing tube; U1 - First optocoupler; U2 - Second optocoupler; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; R6 - Sixth resistor; R7 - Seventh resistor; R8 - Eighth resistor; R9 - Ninth resistor. Detailed implementation manners

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] As Figure 1 shown, a low-power power supply system includes an indoor unit 1 and an outdoor unit 2. The indoor unit 1 includes a connected first power module 12, a first control module 11, and a first switch module 13. The outdoor unit 2 includes a second switch module 25 and connected wake-up circuit 21, second power module 23, and second control module 24. The second switch module 25 is connected in parallel with the wake-up circuit 21. The first power module 12 is electrically connected to the first switch module 13 and the wake-up circuit 21 in sequence. Preferably, the indoor unit 1 further includes a first communication circuit 15 and a voltage stabilizing circuit 14. The first power module 12, the voltage stabilizing circuit 14, the first communication circuit 15, and the first switch module 13 are electrically connected in sequence. One end of the voltage stabilizing circuit 14 is electrically connected to the first power module 12, and the other end of the voltage stabilizing circuit 14 is electrically connected to the first switch module 13. The outdoor unit 2 further includes a second communication circuit 22. The second control module 24 is electrically connected to the second switch module 25 and the wake-up circuit 21 respectively through the second communication circuit 22.

[0030] The output terminals of the first power supply module 12 include an L terminal and an N terminal, and can provide operating voltage for the first control module 11. As an example of the present invention, the first power supply module 12 includes a power supply, a rectifier bridge, and a transformer, which are electrically connected in sequence. Among them, the rectifier bridge is used to convert the alternating current input by the power supply into direct current, and the transformer is used to adjust the voltage value output by the rectifier bridge to other modules. The first control module 11 can control the switching state of the first switch module 13. Preferably, the first switch module 13 has first, second, and third states. When in standby or shutdown, the first switch module 13 is in the third state, disconnecting the communication network, and the whole machine enters the low-power standby energy-saving state; when the outdoor unit 2 is started through the wake-up circuit 21 when powered on, the first switch module 13 is in the second state, generating a wake-up signal through the first communication circuit 15 and finally powering the second control module 24 to wake up the outdoor unit 2; during normal operation, the first switch module 13 is in the first state, and the first power supply module 12 is directly connected to the second power supply module 23 through the voltage stabilizing circuit 14 to short-circuit the wake-up circuit 21. As Figure 2 shown, preferably, the first switch module 13 includes a single-pole double-throw switch K1. The movable end of the single-pole double-throw switch K1 is electrically connected between the wake-up circuit 21 and the L terminal of the first power supply module 12. The first fixed end of the single-pole double-throw switch K1 is electrically connected to the voltage stabilizing circuit 14, and the second fixed end of the single-pole double-throw switch K1 is electrically connected to the other end of the first communication circuit 15. Preferably, the first switch module 13 further includes a fourth diode D4. The second fixed end of the single-pole double-throw switch K1 is connected in series with the anode and cathode of the fourth diode D4 and then electrically connected to the first communication circuit 15.

[0031] One end of the voltage stabilizing circuit 14 is connected to the N terminal of the first power supply module 12, and the other end is electrically connected to the first switch module 13. When the first switch module 13 is in the first state, the other end of the voltage stabilizing circuit 14 is connected to the L terminal of the first power supply module 12; when in the second state, the other end of the voltage stabilizing circuit 14 is connected to the L terminal of the first power supply module 12 after passing through the first communication circuit 15. Preferably, the voltage stabilizing circuit 14 includes a second voltage stabilizing diode ZD2, a fifth resistor R5 and a fifth capacitor C5 connected in parallel. The anode of the second voltage stabilizing diode ZD2 is electrically connected to the N terminal of the first power supply module 12, and the cathode of the second voltage stabilizing diode ZD2 is electrically connected between the first communication circuit 15 and the first fixed terminal of the single-pole double-throw switch K1. This setting can ensure that there is always a voltage drop between the N terminal and the L terminal of the first switch module 13, avoiding a short circuit caused by the direct connection between the N terminal and the L terminal of the first switch module 13. The first communication circuit 15 is used to send a wake-up signal to the outdoor unit 2 during startup and perform data exchange between the indoor unit 1 and the outdoor unit 2 during operation. Preferably, the first communication circuit 15 further includes a fifth diode D5. The anode of the fifth diode D5 is electrically connected to the first communication circuit 15, and the cathode of the fifth diode D5 is electrically connected between the second fixed terminal of the single-pole double-throw switch K1 and the wake-up circuit 21. This setting ensures that the wake-up circuit 21 does not affect the first communication circuit 15. Preferably, the first communication circuit 15 further includes a sixth resistor R6. The sixth resistor R6 is arranged between the anode of the fifth diode D5 and the first communication circuit 15 and is used to adjust the voltage of the first communication circuit 15.

[0032] The first control module 11 is used to control the state of the first switch module 13. When receiving a startup instruction, the first control module 11 generates a control signal, and the control signal can instruct the first switch module 13 to switch from the third state to the second state; when the second control module 24 is woken up, the first control module 11 can control the first switch module 13 to switch from the second state to the first state, and can control the first switch module 13 to switch to the third state again if the operation data transmitted from the outdoor unit 2 is not received within a preset time. By controlling the first switch module 13 to switch to the second state, the wake-up signal of the first communication circuit 15 can be transmitted to the wake-up circuit 21, and finally the second power supply module 23 can be connected to start the outdoor unit 2; when the outdoor unit 2 starts, it switches to the first state to protect the first communication circuit 15 and operate according to the normal logic, which is more power-saving; by controlling the first switch module 13 to switch to the third state, the loop of the indoor unit 1 can be disconnected, avoiding power consumption of the loop of the indoor unit 1.

[0033] The wake-up circuit 21 is used to close in response to the wake-up signal transmitted by the first control module 11, and is used to disconnect under the control of the second control module 24 after the second control module 24 is woken up. After the wake-up circuit 21 is closed, the first power supply module 12 is connected to the second power supply module 23 and supplies power to the second control module 24 to wake up the second control module 24; after the second control module 24 is woken up, the power-on of the wake-up circuit 21 will increase the energy consumption. Therefore, the second control module 24 sends a disconnection signal to the wake-up circuit 21 through the second communication circuit 22, and at the same time connects the second switch module 25.

[0034] The wake-up circuit 21 further includes a step-down module 26, a relay RY1, a first optocoupler U1, a first switching transistor Q1, and a second switching transistor Q2. The first switch module 13 is electrically connected to the second power supply module 23 in series with the normally open contact of the relay RY1. The first end of the first optocoupler U1 electrically connects the first switch module 13 to the emitter and base electrode of the second switching transistor Q2 respectively. The collector of the second switching transistor Q2 is electrically connected to the other end of the relay RY1; the step-down module 26 is located between the first switch module 13 and the first optocoupler U1; preferably, the step-down module 26 includes a first resistor R1 and a first capacitor C1 which are arranged in parallel. This setting effectively stabilizes the voltage value of the wake-up circuit 21, avoids the impact of strong current on the wake-up circuit 21, and ensures that the relay RY1 can be powered on stably. The second end of the first optocoupler U1 electrically connects the step-down module 26 to the collector and base electrode of the first switching transistor Q1 respectively. The emitter of the first switching transistor Q1 is connected to the other end of the relay RY1; the first switching transistor Q1 is used to cooperate with the step-down module 26 to adjust the voltage and current of the relay RY1; the second switching transistor Q2 is used to conduct in response to the wake-up signal to power on the relay RY1. After receiving the wake-up signal, the wake-up circuit 21 controls the normally open contact of the relay RY1 to close, so that the first power supply module 12 is electrically connected to the second power supply module 23, and supplies power to the second control module 24 through the second power supply module 23 to wake up the second control module 24. Preferably, the first switching transistor Q1 and the second switching transistor Q2 are triodes, and thyristors, relays, MOS transistors and other switching devices can also be used.

[0035] Preferably, the wake-up circuit 21 further includes a second resistor R2, a second diode D2, and a first voltage regulator ZD1. The second resistor R2 is disposed between the base electrode of the first switching transistor Q1 and the first optocoupler U1. The second diode D2 is respectively connected to the base electrode of the first switching transistor Q1 and the relay RY1. The first voltage regulator ZD1 is respectively connected to one end of the second diode D2 close to the relay RY1 and the emitter of the first switching transistor Q1. The second diode D2 is reversely connected to the L terminal of the first power supply module 12, which can also prevent the signals inside the wake-up circuit 21 from affecting the power supply signal. By setting the second resistor R2, the output voltage of the first switching transistor Q1 can be adjusted to ensure that the voltage and current of the relay RY1 meet the startup requirements but do not exceed the current. Preferably, the wake-up circuit 21 further includes a first diode D1. The first switching module 13 is connected to the first end of the first optocoupler U1 after being connected in series with the anode and cathode of the first diode D1. Since the first diode D1 is reversely connected to the first communication circuit 22, the signals inside the wake-up circuit 21 will not affect the normal operation of the first communication circuit 15.

[0036] Preferably, the wake-up circuit 21 further includes a second optocoupler U2. The second control module 24 is connected to the first end of the second optocoupler U2 and controls its on / off. A ninth resistor R9 is serially disposed at the first end of the second optocoupler U2. The second end of the second optocoupler U2 connects the first switching module 13 to the base electrode of the second switching transistor Q2. This setting enables the wake-up signal generated by the first control module 11 and the exit wake-up signal generated by the second control module 24 to be controlled separately, avoiding interference and having a clear control logic. Preferably, an eighth resistor R8 is further disposed between the base electrode of the second switching transistor Q2 and the second optocoupler U2. A fourth resistor R4 is disposed between the first optocoupler U1 and the emitter of the second switching transistor Q2. A seventh resistor R7 is further disposed between the first optocoupler U1 and the collector of the second switching transistor Q2. This setting can adjust the currents of the base electrode, collector, and emitter of the second switching transistor Q2 to meet the requirements, ensuring that the first optocoupler U1 cannot conduct when receiving the exit wake-up signal, so that the relay RY1 is disconnected.

[0037] When the indoor unit 1 is powered on and in standby, the contact of the relay RY1 of the outdoor unit 2 is not connected to AC-L, and the outdoor unit 2 is not powered on. When a startup instruction is received, the first control unit 11 controls the single-pole double-throw switch K1 to switch to the second state, and is connected to the second power module 23 of the outdoor unit 2 through the fourth diode D4 and the relay RY1. The first communication circuit 15 generates a wake-up signal and acts on the wake-up circuit 21, and is electrically connected to AC-L through the first end of the first optocoupler U1 and the second switching transistor Q2, so that the first optocoupler U1 is turned on and conducts. The resistance-capacitance step-down module C1 / R1 of AC-L ensures the voltage and current for driving the relay RY1 through the first optocoupler U1 and the loop, controls RY1 to close, conducts AC-L, so that the first power module 12 is connected to the second power module 23, and the second power module 23 supplies power to the second control module 24 to wake up the outdoor unit 2.

[0038] After successful wake-up, the second control module 24 controls the second switch module 25 to close through the second communication circuit 22, and at the same time sends an exit wake-up signal to the second optocoupler U2 of the wake-up circuit 21. The exit wake-up signal connects the first end of the second optocoupler U2 to make it work and conduct. The second end of the second optocoupler U2 connects the first diode D1, the eighth resistor R8 and AC-L. At this time, the second switching transistor Q2 does not work, and the current passing through the third resistor R3, the first optocoupler U1 and the fourth resistor R4 is not enough to turn on the first optocoupler U1, so the relay RY1 is disconnected. At the same time, the first control module 11 controls the single-pole double-throw switch K1 to switch to the second state and is directly connected to the voltage stabilizing circuit 14, and then exits the wake-up state, and the whole machine works normally, and the communication circuit will operate according to the normal logic.

[0039] When in standby or shutdown, the control signal generated by the second control module 24 controls the second switch module 25 to disconnect from AC-L through the second communication circuit 22. Further, the outdoor unit 2 is not powered on. After all the loads of the indoor unit 1 stop running, the first control module 11 controls the single-pole double-throw switch K1 to switch to the third state, disconnects the communication network, and the whole machine enters the low-power standby energy-saving state. When the wake-up signal connects AC-L to the outdoor unit 2 through the single-pole double-throw switch K1, due to the reverse bias of the fifth diode D5, there will be no circuit safety problem for the first communication circuit 15 of the indoor unit 1.

[0040] Embodiment 2

[0041] In order to further increase the application scenarios of the low-power power supply system, the applicant further improves the above solution. By reserving JMP1 and changing the wiring, that is, changing the outdoor unit power supply from AC-L in the existing solution to OUTDR and installing JMP1 to be compatible with the low-power application scenarios under the indoor unit power supply.

[0042] As Figure 3 、 Figure 4As shown, a low-power power supply system changes the AC-L line in Figure 2 to the OUTDR line and changes the connection method; at the same time, a jumper JUMP1 is connected in parallel to the original wake-up circuit 21 so that the wake-up circuit 21 is short-circuited. The basic principle and the resulting technical effects are the same as those of the above embodiments. For the sake of brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding content in the above embodiments. The low-power power supply system can adapt to air conditioners of different power supply types, has strong adaptability, and saves development costs and time costs.

[0043] When the indoor unit 1 is on standby, the single-pole double-throw switch K1 is in the third state, and at this time, the outdoor unit 2 is not powered on; the first control module 11 sends a wake-up signal to the wake-up circuit 21, activates the relay RY1, and determines whether the wake-up function is executed according to whether the operation data of the outdoor unit 2 is received; if the indoor unit 1 receives the operation data of the outdoor unit 2, it executes according to the normal communication protocol logic; if the operation data of the outdoor unit 2 is not received continuously for N seconds, it is considered that the outdoor unit 2 is not powered on, the wake-up relay RY1 is disconnected, and the reception is blocked to cut off the power supply of the outdoor unit 2 for 1 s, 5 s, 10 s, etc.; then the relay RY1 is turned on again, and after a period of time, it waits to receive, such as 1 s, 2 s, 5 s. If the outdoor unit data is not received within the established time, this step is executed again. After turning on the power for a certain number of times, such as 1 time, 2 times, 3 times, 5 times, etc. or after turning on the power for a period of time, the wake-up function is exited; the indoor unit 1 controls the relay RY1 on the wake-up circuit 21 of the outdoor unit 2 through communication to realize the on-off of the wake-up circuit.

[0044] The present invention also provides an air conditioner, which can be a cabinet air conditioner, a wall-mounted air conditioner, a ceiling-mounted air conditioner, etc., preferably a cabinet air conditioner; in addition to the above low-power control system, the air conditioner is also provided with components such as an evaporator, a condenser, a compressor, and a fan. Since the above structure and assembly relationship are prior art, they will not be described in detail here.

[0045] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the claims.

Claims

1. A low-power power supply system, comprising an indoor unit (1) and an outdoor unit (2), characterized in that, The indoor unit (1) includes a first power module (12), a first control module (11), and a first switch module (13) connected to each other. The outdoor unit (2) includes a second switch module (25), and a wake-up circuit (21), a second power module (23), and a second control module (24) connected to each other. The second switch module (25) is connected in parallel with the wake-up circuit (21). The first power module (12) is electrically connected to the first switch module (13) and the wake-up circuit (21) in sequence. The second control module (24) is electrically connected to the second switch module (25) and the wake-up circuit (21) respectively; The first control module (11) is used to control the state of the first switch module (13); the wake-up circuit (21) includes a voltage reduction module (26) and a relay (RY1) connected to each other. The first switch module (13) is electrically connected to the second power module (23) after being connected in series with the normally open contact of the relay (RY1). The relay (RY1) is used to close in response to a wake-up signal to wake up the second control module (24); the second control module (24) is used to control the second switch module (25) to close after being woken up so that the outdoor unit (2) works normally; the voltage reduction module (26) is a resistor-capacitor voltage reduction circuit composed of a first resistor (R1) and a first capacitor (C1) connected in parallel; Wherein, the wake-up circuit (21) further includes a first optocoupler (U1), a first switching transistor (Q1), and a second switching transistor (Q2). The first end of the first optocoupler (U1) electrically connects the first switch module (13) to the emitter and base electrode of the second switching transistor (Q2) respectively. The collector of the second switching transistor (Q2) is connected to one end of the relay (RY1). The second end of the first optocoupler (U1) electrically connects the voltage reduction module (26) to the collector and base electrode of the first switching transistor (Q1) respectively. The emitter of the first switching transistor (Q1) is connected to the other end of the relay (RY1); The wake-up circuit (21) further includes a second resistor (R2), a second diode (D2), and a first voltage regulator diode (ZD1). One end of the second resistor (R2) is connected to the first optocoupler (U1). The other end of the second resistor (R2) is disposed between the base electrode of the first switching transistor (Q1) and the second diode (D2). The second diode (D2) is connected to the base electrode of the first switching transistor (Q1) and one end of the relay (RY1) respectively. The first voltage regulator diode (ZD1) is connected to one end of the second diode (D2) close to the relay (RY1) and the emitter of the first switching transistor (Q1) respectively; The indoor unit (1) further includes a first communication circuit (15). The first switch module (13), the first communication circuit (15), and the wake-up circuit (21) are electrically connected in sequence.

2. The low-power power supply system according to claim 1, characterized in that The first switching transistor (Q1) is used to cooperate with the voltage reduction module (26) to adjust the voltage and current of the relay (RY1); The second switching transistor (Q2) is used to conduct in response to the wake-up signal to power on the relay (RY1). The relay (RY1) is used to control the normally open contact of the relay (RY1) to close after being powered on, so that the first power supply module (12) is electrically connected to the second power supply module (23), and the second power supply module (23) supplies power to the second control module (24) to wake up the second control module (24).

3. The low-power power supply system according to claim 2, wherein, The wake-up circuit (21) further includes a second optocoupler (U2); the second control module (24) is connected to the first end of the second optocoupler (U2) and controls its on / off, and the second end of the second optocoupler (U2) connects the first switching module (13) to the base electrode of the second switching transistor (Q2).

4. The low-power power supply system according to claim 3, wherein, An eighth resistor (R8) is further provided between the base electrode of the second switching transistor (Q2) and the second optocoupler (U2), a fourth resistor (R4) is provided between the first optocoupler (U1) and the base electrode of the second switching transistor (Q2), and a seventh resistor (R7) is further provided between the second optocoupler (U2) and the collector of the second switching transistor (Q2).

5. The low-power power supply system according to claim 1, characterized in that, The outdoor unit (2) further includes a second communication circuit (22), the second communication circuit (22) is connected to the second control module (24), and is used to control the on / off of the wake-up circuit (21) and the second switching module (25) after being woken up; the first control module (11) is further used to control the first switching module (13) to switch to the first state after the second control module (24) is woken up.

6. The low-power power supply system according to claim 5, wherein, The second control module (24) is further used to control the second switching module (25) to disconnect when receiving a shutdown instruction to stop transmitting operation data to the first control module (11); the first control module (11) is further used to control the first switching module (13) to switch to the third state when operation data transmitted from the outdoor unit (2) is not received within a preset time.

7. The low-power power supply system according to claim 6, wherein The first switching module (13) includes a single-pole double-throw switch (K1), the movable end of the single-pole double-throw switch (K1) is electrically connected between the wake-up circuit (21) and the L terminal of the first power supply module (12), the first fixed end of the single-pole double-throw switch (K1) is electrically connected to the N terminal of the first power supply module (12) through a voltage stabilizing circuit (14), and the second fixed end of the single-pole double-throw switch (K1) is electrically connected to the other end of the first communication circuit (15); wherein, when the movable end of the single-pole double-throw switch (K1) is connected to the second fixed end, the first switching module (13) is in the second state, and when the movable end of the single-pole double-throw switch (K1) is connected to the first fixed end, the first switching module (13) is in the first state.

8. An air conditioner, characterized in that, The air conditioner includes the low-power supply system according to any one of claims 1-7.

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