CN110768254A

CN110768254A - Power supply circuit, control method and device of power supply circuit and air conditioner

Info

Publication number: CN110768254A
Application number: CN201911124933.0A
Authority: CN
Inventors: 钱雄; 吴田; 刘国峰; 温永和
Original assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Heating and Ventilating Equipment Co Ltd; Guangdong Midea HVAC Equipment Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-02-07
Anticipated expiration: 2039-11-18
Also published as: CN110768254B

Abstract

The invention provides a power supply circuit, a control method and a control device of the power supply circuit and an air conditioner, wherein the power supply circuit comprises: a first control circuit; the first power supply circuit is connected with the first control circuit; the second power supply circuit is connected with the first power supply circuit; the second control circuit is connected with the second power supply circuit and is configured to control the second power supply circuit to supply power to the first power supply circuit according to the abnormal judgment result of the power supply signal output by the second power supply circuit, so that the first power supply circuit and the first control circuit are prevented from being damaged due to power failure, and the reliability of the power supply circuit is improved.

Description

Power supply circuit, control method and device of power supply circuit and air conditioner

Technical Field

The invention relates to the technical field of circuit control, in particular to a power supply circuit, a control method of the power supply circuit, a control device of the power supply circuit and an air conditioner.

Background

In the related technical scheme, in a three-phase power supply system, a board assembly has a 380VAC and 220VAC mixed power supply form.

Those skilled in the art find that in practical engineering debugging, there may be power-up faults, which may cause the power supply interface that originally receives 220VAC to receive abnormally high voltage, resulting in damage to the power supply system.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the invention provides a supply circuit.

In a second aspect of the present invention, a method for controlling a power supply circuit is provided.

A third aspect of the present invention is to provide a control apparatus for a power supply circuit.

A fourth aspect of the present invention is to provide an air conditioner.

In view of the above, according to a first aspect of the present invention, there is provided a power supply circuit including: a first control circuit; the first power supply circuit is connected with the first control circuit; the second power supply circuit is connected with the first power supply circuit; and the second control circuit is connected with the second power supply circuit and is configured to control the second power supply circuit to supply power to the first power supply circuit according to the abnormal judgment result of the power supply signal output by the second power supply circuit.

The invention provides a power supply circuit, wherein the power supply circuit comprises a first control circuit, a first power supply circuit, a second power supply circuit and a second control circuit, wherein the second control circuit determines whether the second power supply circuit supplies power to the first power supply circuit and the first control circuit by detecting a judgment result of whether a power supply signal output by the second power supply circuit is abnormal, so that the first power supply circuit and the first control circuit are prevented from being damaged due to power failure, and the reliability of the power supply circuit is improved.

In addition, the power supply circuit in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the power circuit is further included, and the power circuit is connected with the second power circuit and the first control circuit.

In the technical scheme, the power supply circuit further comprises a power circuit, wherein the power circuit is connected with the second power circuit and supplies power to the load according to a power supply signal output by the second power circuit, and in the process, the power supply of the power circuit to the load is controlled by the first control circuit based on the connection relation between the power circuit and the first control circuit, so that the first control circuit can be powered on preferentially, therefore, the power circuit can be powered on again after the first control circuit works stably, and the power circuit is prevented from being damaged due to the fact that the first control circuit is unstable at the moment of power-on.

In any of the above technical solutions, the power circuit includes: a capacitor; a rectifying circuit; the input end of the pre-charging circuit is connected with the output end of the rectifying circuit, and the output end of the pre-charging circuit is connected with the capacitor; and the first end of the first switching device is connected with the input end of the pre-charging circuit, the second end of the first switching device is connected with the output end of the pre-charging circuit, and the first switching device is configured to control the pre-charging circuit to charge the capacitor.

In the technical scheme, the power circuit comprises a capacitor, a rectifying circuit, a pre-charging circuit and a first switch device, wherein the pre-charging circuit is connected between the rectifying circuit and the capacitor in series and charges the capacitor according to a received power supply signal so that the capacitor supplies power to a load, and the capacitor is prevented from being damaged due to overlarge charging current in the electrifying process of the capacitor; through setting up first switching device, can realize pre-charge circuit's on-off control, after the pre-charge is ended, close through the first switching device that sets up to reduce power circuit's consumption.

In any of the above solutions, the second control circuit is further configured to control a power supply state of the second power supply circuit to the first power supply circuit according to a demand signal of the load.

In the technical scheme, the power supply state of the second power supply circuit to the first power supply circuit is controlled by the demand signal of the load, so that the problem that the power consumption of the power supply circuit is high due to the fact that the second power supply circuit supplies power to the first power supply circuit all the time under the condition that the power supply signal is normal is solved.

In any of the above technical solutions, the second control circuit is connected to the first control circuit, and the second control circuit is further configured to control an open/close state of the first switching device according to a demand signal of the load.

In this technical scheme, the second control circuit controls the on-off state of first switching device according to the demand signal of load, and then whether control precharge circuit carries out the precharge to the electric capacity, because whether work of precharge circuit receives the demand signal control of load, consequently, when the demand signal of load is zero, can understand that, when the load need not supply power, precharge circuit is out of operation, and then reduces power circuit's consumption.

In any of the above technical solutions, the first control circuit is connected to the first switching device, and the first control circuit is configured to determine a start-stop signal of the load according to a demand signal of the load; and controlling the on-off state of the first switching device and the first switching device of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at the two ends of the capacitor and the specified threshold value.

In the technical scheme, a first control circuit is connected with a first switch device, the first control circuit determines a start-stop signal of a load according to a demand signal of the load, and then controls the on-off state of the first switch device according to the start-stop signal of the load and a comparison result of a voltage value at two ends of a capacitor and a specified threshold value.

In any of the above technical solutions, the method further includes: the input end of the first inverter circuit is connected with the capacitor, and the output end of the inverter circuit is configured to output a first operating voltage.

In the technical scheme, the arranged first inverter circuit can output a first operating voltage so as to operate a load such as a compressor or a fan.

In any of the above technical solutions, the method further includes: the input ends of the two inverter circuits are connected with the capacitor; and the third control circuit is connected with the first power supply circuit, the second control circuit and the second inverter circuit and is configured to control the second inverter circuit to output the second operating voltage.

In the technical scheme, the input end of the second inverter circuit is connected with the capacitor, namely, power is taken through the capacitor, so that the second inverter circuit can output a second operating voltage, and the second inverter circuit is also connected with the third control circuit, so that when a demand signal of a load is zero, the third control circuit can control the operating state of the load connected with the second inverter circuit in a mode of controlling the output of the second operating voltage.

In a second aspect of the present invention, a control method of a power supply circuit is provided, for use in any one of the above power supply circuits, wherein the control method of the power supply circuit includes: and controlling the second power supply circuit to supply power to the first power supply circuit according to the abnormal judgment result of the power supply signal output by the second power supply circuit.

The invention provides a control method of a power supply circuit, which determines whether a second power supply circuit supplies power to a first power supply circuit and a first control circuit by detecting a judgment result of whether a power supply signal output by the second power supply circuit is abnormal or not, so that the first power supply circuit and the first control circuit are prevented from being damaged due to power failure, and the reliability of the power supply circuit is improved.

In addition, the control method of the power supply circuit in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the step of controlling the second power supply circuit to supply power to the first power supply circuit according to the abnormal determination result of the power supply signal output by the second power supply circuit specifically includes: determining that the power supply signal meets an abnormal condition, and controlling the second power supply circuit to stop supplying power to the first power supply circuit; or determining that the power supply signal does not meet the abnormal condition, and controlling the second power supply circuit to supply power to the first power supply circuit.

In the technical scheme, when the power supply signal is detected to meet the abnormal condition, the second power supply circuit is controlled to stop supplying power to the first power supply circuit, and only when the power supply signal does not meet the abnormal condition, the second power supply circuit is controlled to supply power to the first power supply circuit.

In any of the above solutions, the abnormal condition includes one or more of a phase error, a phase loss, an overvoltage, and an undervoltage.

In any of the above technical solutions, the method further includes: and controlling the power supply state of the second power supply circuit to the first power supply circuit according to the demand signal of the load.

In any of the above technical solutions, the step of controlling the power supply state of the second power supply circuit to the first power supply circuit according to the demand signal of the load specifically includes: determining that a demand signal of a load is not zero, and controlling a second power supply circuit to supply power to a first power supply circuit; or determining that the demand signal of the load is zero, and controlling the second power supply circuit to stop supplying power to the first power supply circuit.

In the technical scheme, when the condition that a demand signal of the load is not zero is determined, the second power supply circuit is controlled to supply power to the first control circuit through the first power supply circuit, and at the moment, the first control circuit can control the on-off state of a first switch device of the power circuit, so that the pre-charging control of the capacitor is realized, and the power circuit can supply power to the load; when the demand signal of the load is zero, the power supply circuit enters a standby state, and the first power supply circuit and the first control circuit are not powered on, so that the power consumption of the power supply circuit is effectively reduced.

In any of the above technical solutions, the step of controlling the second power supply circuit to supply power to the first power supply circuit according to the demand signal of the load further includes: and controlling the opening and closing state of the first switching device according to the demand signal of the load.

In any of the above technical solutions, the step of controlling the on-off state of the first switching device according to the demand signal of the load specifically includes: determining a start-stop signal of the load according to the demand signal of the load; and controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at the two ends of the capacitor and the specified threshold value.

In the technical scheme, the on-off state of the first switch device is influenced by the comparison result of the voltage value at the two ends of the capacitor and the specified threshold value, the capacitor is ensured not to be damaged due to overlarge charging current when being charged, meanwhile, the on-off state of the first switch device is also influenced by the start-stop signal for determining the load according to the demand signal of the load, and the power consumption of the capacitor and the pre-charging circuit in the charging state can not be generated due to the fact that the first switch device can not be opened when the load is not needed to be started, and therefore the standby power consumption of the power supply circuit is effectively reduced.

In any of the above technical solutions, the step of determining the start-stop signal of the load according to the demand signal of the load specifically includes: determining that a demand signal of a load is not zero, and generating a starting signal of the load; or determining that the demand signal of the load is zero, and generating a shutdown signal of the load.

In the technical scheme, the requirement signal of the load is determined to be not zero, namely the load needs to be started, and at the moment, a starting signal of the load is generated so that the first switching device can act to pre-charge the capacitor, so that the capacitor is prevented from being damaged due to overlarge charging current during charging; and determining that the demand signal of the load is zero, and generating a shutdown signal of the load so that the first switching device shields the pre-charging circuit and simultaneously controls the pre-charging circuit to be switched off to reduce the power consumption of the power circuit.

In any of the above technical solutions, the step of controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result between the voltage value at the two ends of the capacitor and the specified threshold specifically includes: determining that a starting signal of a load is received and the voltage value of two ends of a capacitor is greater than or equal to a specified threshold value, and controlling a first switching device to be closed; or determining that the voltage value at the two ends of the capacitor is smaller than a specified threshold value and/or receiving a stop signal of the load, and controlling the first switching device to be opened.

In the technical scheme, when the fact that the starting signal of the load is received is detected and determined, and the voltage value of the two ends of the capacitor is larger than or equal to the specified threshold value, namely the load is required to be started and the pre-charging circuit is used for charging the capacitor to be finished, the first switching device is controlled to be closed, the pre-charging circuit is shielded by the first switching device, and the pre-charging circuit does not work, so that power consumption of the power supply circuit can be reduced. And when the voltage value at the two ends of the capacitor is determined to be smaller than the designated threshold value, namely the pre-charging of the capacitor is not finished, the first switch device is controlled to be opened, so that the pre-charging circuit can continuously charge the capacitor, and the capacitor is further ensured not to be damaged due to overlarge charging current during charging. And when a shutdown signal of the load is received, the first switch device is controlled to be opened so as to further control the second switch device in the pre-charging circuit to be opened, when the second switch device is opened, the pre-charging circuit does not work, and because the shutdown signal of the load is generated when the demand signal of the load is zero, the second power supply circuit does not supply power to the first power supply circuit, so that only the second control circuit of the power supply circuit is in a power-on state, and the standby power consumption of the power supply circuit is effectively reduced.

In a third aspect of the present invention, a control device of a power supply circuit is provided, including: a controller; a memory for storing a computer program; the controller executes a computer program stored in the memory to implement, for example, a step of controlling the second power supply circuit to supply power to the first power supply circuit in accordance with the abnormality judgment result of the power supply signal output from the second power supply circuit.

The control device of the power supply circuit provided by the invention comprises: a controller; a memory for storing a computer program; the controller executes the computer program stored in the memory to realize, for example, determination of whether the second power supply circuit supplies power to the first power supply circuit and the first control circuit by detecting a judgment result of whether the power supply signal output from the second power supply circuit is abnormal, and therefore, the first power supply circuit and the first control circuit are prevented from being damaged due to power-up failure, and therefore, the reliability of the power supply circuit is improved.

In addition, the control device of the power supply circuit in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, the controller executes a computer program stored in the memory to implement controlling the second power supply circuit to stop supplying power to the first power supply circuit if it is determined that the power supply signal satisfies the abnormal condition; or determining that the power supply signal does not meet the abnormal condition, and controlling the second power supply circuit to supply power to the first power supply circuit.

In any of the above solutions, the controller executes the computer program stored in the memory to implement the state of controlling the power supply of the second power circuit to the first power circuit according to the demand signal of the load.

In any of the above solutions, the controller executes the computer program stored in the memory to implement, for example, determining that the demand signal of the load is not zero, controlling the second power supply circuit to supply power to the first power supply circuit; or determining that the demand signal of the load is zero, and controlling the second power supply circuit to stop supplying power to the first power supply circuit.

In any of the above solutions, the controller executes a computer program stored in the memory to implement, for example, controlling the on/off state of the first switching device according to the demand signal of the load.

In any of the above technical solutions, the controller executes a computer program stored in the memory to implement, for example, determining a start-stop signal of the load according to a demand signal of the load; and controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at the two ends of the capacitor and the specified threshold value.

In any of the above solutions, the controller executes the computer program stored in the memory to implement, for example, determining that the demand signal of the load is not zero, generating a turn-on signal of the load; or determining that the demand signal of the load is zero, and generating a shutdown signal of the load.

In any of the above technical solutions, the controller executes a computer program stored in the memory to implement, for example, determining that a turn-on signal of the load is received and a voltage value across the capacitor is greater than or equal to a specified threshold value, controlling the first switching device to be closed; or determining that the voltage value at the two ends of the capacitor is smaller than a specified threshold value and/or receiving a stop signal of the load, and controlling the first switching device to be opened.

In a fourth aspect of the present invention, an air conditioner is provided, including the power supply circuit according to any one of the above technical solutions; and/or a control device of the power supply circuit according to any one of the above-mentioned technical solutions.

The air conditioner provided by the invention comprises the power supply circuit of any one of the technical schemes; and/or a control device for a power supply circuit according to any of the above-mentioned claims, and therefore, a power supply circuit according to any of the above-mentioned claims; and/or any of the above technical solutions, and are not described herein again.

In the above technical solution, the demand signal of the load of the control device of the power supply circuit includes at least one of a cooling demand, a heating demand, and a wind speed demand.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 shows a schematic block diagram of a power supply circuit according to one embodiment of the present invention;

FIG. 2 shows a schematic block diagram of a power supply circuit according to one embodiment of the invention;

FIG. 3 shows a schematic block diagram of a power circuit according to one embodiment of the invention;

FIG. 4 shows a schematic block diagram of a power circuit according to one embodiment of the invention;

FIG. 5 shows a flow diagram of a control method of a power supply circuit according to one embodiment of the invention;

FIG. 6 shows a flow diagram of a method of controlling a power supply circuit according to one embodiment of the invention;

FIG. 7 shows a flow diagram of a method of controlling a power supply circuit according to one embodiment of the invention;

FIG. 8 shows a flow diagram of a method of controlling a power supply circuit according to one embodiment of the invention;

FIG. 9 shows a schematic block diagram of a control device of a power supply circuit according to one embodiment of the present invention;

FIG. 10 illustrates a schematic block diagram of an air conditioner according to an embodiment of the present invention;

fig. 11 shows a schematic diagram of power supply of an air conditioner according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 10 is:

102 a first control circuit, 104 a first power supply circuit, 106 a second power supply circuit, 108 a second control circuit, 110 a power circuit, 1102 a capacitor, 1104 a rectifying circuit, 1106 a pre-charging circuit, 1108 a first switching device, 112 a first inverter circuit, 114 a second inverter circuit, 116 a third control circuit.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Example one

In one embodiment of the present invention, as shown in fig. 1, 2 and 4, there is provided a power supply circuit 100 including: a first control circuit 102; a first power supply circuit 104, the first power supply circuit 104 being connected to the first control circuit 102; a second power supply circuit 106, the second power supply circuit 106 being connected to the first power supply circuit 104; and a second control circuit 108, wherein the second control circuit 108 is connected to the second power supply circuit 106, and the second control circuit 108 is configured to control the second power supply circuit 106 to supply power to the first power supply circuit 104 according to the abnormality determination result of the power supply signal output by the second power supply circuit 106.

The invention provides a power supply circuit 100, wherein the power supply circuit 100 comprises a first control circuit 102, a first power supply circuit 104, a second power supply circuit 106 and a second control circuit 108, wherein the second control circuit 108 determines whether the second power supply circuit 106 supplies power to the first power supply circuit 104 and the first control circuit 102 by detecting a judgment result of whether a power supply signal output by the second power supply circuit 106 is abnormal, so that the first power supply circuit 104 and the first control circuit 102 are prevented from being damaged due to power-up error, and therefore, the reliability of the power supply circuit 100 is improved.

In an embodiment of the present invention, as shown in fig. 2 and fig. 4, the power supply circuit 100 further includes a power circuit 110, where the power circuit 110 is connected to the second power circuit 106 and the first control circuit 102, that is, the second power circuit 106 supplies power to the first power circuit 104 and also supplies power to the power circuit 110, and based on the connection relationship between the power circuit 110 and the first control circuit 102, the power supply from the power circuit 110 to the load may be controlled by the first control circuit 102, that is, the power circuit 110 is controlled to be powered on after the first control circuit 102 is powered on, so that it is ensured that the power circuit 110 is powered on again after the first control circuit 102 operates stably, and the power circuit 110 is prevented from being damaged due to the instability of the first control circuit 102 at the time of powering on.

In one embodiment, as shown in fig. 3, the power circuit 110 includes: a capacitor 1102; a rectifier circuit 1104; the input end of the pre-charging circuit 1106 is connected with the output end of the rectifying circuit 1104, and the output end of the pre-charging circuit 1106 is connected with the capacitor 1102; a first switching device 1108, a first terminal of the first switching device 1108 being connected to an input terminal of the pre-charge circuit 1106, a second terminal of the first switching device 1108 being connected to an output terminal of the pre-charge circuit 1106, the first switching device 1108 being configured to control the pre-charge circuit 1106 to charge the capacitor 1102.

In this embodiment, the power circuit 110 includes a capacitor 1102, a rectifying circuit 1104, a pre-charging circuit 1106, and a first switch device 1108, where the pre-charging circuit 1106 is connected in series between the rectifying circuit 1104 and the capacitor 1102, and charges the capacitor 1102 according to a received power supply signal, so that the capacitor 1102 supplies power to a load, and the capacitor 1102 is prevented from being damaged due to an excessive charging current in a power-on process of the capacitor 1102; the on-off control of the pre-charging circuit 1106 can be realized by setting the first switch device 1108, and after the pre-charging is finished, the set first switch device 1108 is closed to reduce the power consumption of the power circuit 110.

In one embodiment, the second control circuit 108 is further configured to control a power supply state of the second power circuit 106 to the first power circuit 104 according to the demand signal of the load.

In this embodiment, the power supply state of the second power circuit 106 to the first power circuit 104 is also controlled by the demand signal of the load, so as to avoid the problem that the power consumption of the power supply circuit 100 is high when the second power circuit 106 always supplies power to the first power circuit 104 under the condition that the power supply signal is normal.

Specifically, when the demand signal of the load is zero, the second power supply circuit 106 may be controlled to stop supplying power to the first power supply circuit 104, that is, the power circuit 110, the first power circuit 104, and the first control circuit 102 in the power supply circuit 100 are not powered, only the second control circuit 108 is powered, therefore, power consumption and heat generation during standby of the power circuit 110, the first power circuit 104 and the first control circuit 102 are reduced, and the load non-operation can be reduced, the potential for damage to components in the power circuit 110 from surges between the power circuit 110 and the first power supply circuit 104 and the first control circuit 102 and the load, meanwhile, the influence of other devices in the power grid where the second power supply circuit 106 is located during switching execution and surge signals in the power grid on the power circuit 110, the first control circuit 102 and the first power supply circuit 104 can be avoided, and therefore the reliability and the service life of the power circuit 110 during operation are improved.

In one embodiment, the second control circuit 108 is connected to the first control circuit 102, and the second control circuit 108 is further configured to control the on/off state of the first switching device 1108 according to the demand signal of the load.

In this embodiment, the second control circuit 108 controls the on/off state of the first switch device 1108 according to the demand signal of the load, and further controls whether the precharge circuit 1106 precharges the capacitor, and since whether the precharge circuit 1106 operates is controlled by the demand signal of the load, when the demand signal of the load is zero, it can be understood that the precharge circuit 1106 does not operate when the load does not need to be supplied with power, and further the power consumption of the power circuit 110 is reduced.

In an embodiment thereof, the first control circuit 102 is connected to the first switching device 1108, and the first control circuit 102 is configured to determine a start-stop signal of the load according to a demand signal of the load; and controlling the on-off state of the first switch device and the first switch device 1108 according to the on-off signal of the load, the comparison result of the voltage value at the two ends of the capacitor and the specified threshold value.

In this embodiment, the first control circuit 102 is connected to the first switch device 1108, the first control circuit 102 determines a start-stop signal of the load according to a demand signal of the load, and further controls an on-off state of the first switch device 1108 according to the start-stop signal of the load, a comparison result of a voltage value at two ends of the capacitor and a specified threshold, specifically, when the demand signal of the load is not zero, a start signal of the load is generated, that is, the load needs to be controlled to operate, the first switch is controlled to be opened, so that the pre-charge circuit 1106 pre-charges the capacitor, the current magnitude in the charging process of the capacitor is reduced, and the capacitor is prevented from being damaged due to overcurrent, and when the voltage at two ends of the charged capacitor reaches the specified threshold, the first switch device 1108 is controlled to be closed, the pre-charge circuit 1106 is shielded, and the power consumption.

In one embodiment, the pre-charge circuit 1106 includes at least one resistor and a second switch device connected in series, wherein a first terminal of the second switch device is connected to a first terminal of the first switch device 1108, a second terminal of the second switch device is connected to a first terminal of the at least one resistor, and a second terminal of the at least one resistor is connected to a second terminal of the first switch device 1108, when it is determined that the demand signal of the load is zero, i.e. the load does not need to work, after controlling the load to stop running, the first switch device 1108 is turned on, and then the second switch device is turned on, and then the second power circuit 106 is controlled to stop supplying power to the first power circuit 104, and at this time, only the second control circuit 108 is running under the power of the second power circuit 106, and the power circuit 110, the first power circuit 104 and the first control circuit 102 are not powered, to reduce power consumption of the power supply circuit 100.

Example two

In any of the above embodiments, as shown in fig. 4, the power supply circuit 100 further includes: the input end of the first inverter circuit is connected with the capacitor, and the output end of the inverter circuit is configured to output a first operating voltage.

In this embodiment, a first inverter circuit may be provided to output a first operating voltage for operation of a load such as a compressor or a fan.

In an embodiment of the present invention, the first inverter circuit is connected to the first control circuit 102, wherein the first control circuit 102 controls the first inverter circuit to stop outputting or output the first operating voltage according to a start-stop signal of the load, so as to access the compression stop operation or operation of the first operating voltage, thereby implementing the control of the operating state of the load.

Specifically, when the demand signal of the load is zero, a shutdown signal of the load is generated, the first inverter circuit is controlled to control the load to stop running, and when the voltage value at the two ends of the capacitor is detected to be smaller than the safe voltage, the second power circuit 106 is controlled to stop supplying power to the first power circuit 104, so as to ensure that the power supply circuit 100 is reliably powered off.

In one embodiment, the method further comprises: the input ends of the two inverter circuits are connected with the capacitor; and a third control circuit connected to the first power circuit 104, the second control circuit 108 and the second inverter circuit, the third control circuit being configured to control the second inverter circuit to output the second operating voltage.

In this embodiment, the input terminal of the second inverter circuit is connected to the capacitor, i.e. the capacitor is used to get power, so that the second inverter circuit can output the second operating voltage, and since the second inverter circuit is also connected to the third control circuit, therefore, when the demand signal of the load is zero, the third control circuit may control the operation state of the load to which the second inverter circuit is connected by controlling to output the second operation voltage, and is connected to the first power circuit 104, and thus, when it is detected that the power supply signal output from the second power supply circuit 106 is abnormal or the demand signal of the load is zero, the third control circuit will stop the second power circuit 106 from supplying power to the first power circuit 104, the power supply circuit 100 is not powered on to work, and the power consumption is effectively reduced because the third control circuit is not powered on.

EXAMPLE III

In an example of the present invention, as shown in fig. 5, a control method for a power supply circuit of the above power supply circuit is proposed, wherein the method includes:

step 502, controlling the second power supply circuit to supply power to the first power supply circuit according to the abnormal judgment result of the power supply signal output by the second power supply circuit.

In an embodiment of the present invention, step 502, controlling the second power supply circuit to supply power to the first power supply circuit according to the abnormal determination result of the power supply signal output by the second power supply circuit specifically includes: determining that the power supply signal meets an abnormal condition, and controlling the second power supply circuit to stop supplying power to the first power supply circuit; or determining that the power supply signal does not meet the abnormal condition, and controlling the second power supply circuit to supply power to the first power supply circuit.

In the embodiment, when the power supply signal is detected to meet the abnormal condition, the second power supply circuit is controlled to stop supplying power to the first power supply circuit, and only when the power supply signal does not meet the abnormal condition, the second power supply circuit is controlled to supply power to the first power supply circuit.

In one embodiment thereof, the abnormal condition includes one or more of a phase error, a phase loss, an over-voltage, an under-voltage.

In one example of the present invention, as shown in fig. 6, a control method of a power supply circuit includes:

step 602, determining that the power supply signal does not meet an abnormal condition;

and step 604, controlling the power supply state of the second power supply circuit to the first power supply circuit according to the demand signal of the load.

In this embodiment, the power supply state of the second power supply circuit to the first power supply circuit is also controlled by the demand signal of the load, so that the problem that the power consumption of the power supply circuit is high due to the fact that the second power supply circuit always supplies power to the first power supply circuit under the condition that the power supply signal is normal is avoided.

In an embodiment, as shown in fig. 7, the method for controlling the power supply circuit includes:

step 702, determining that the power supply signal does not meet an abnormal condition;

step 704, determining that the demand signal of the load is not zero, and controlling a second power supply circuit to supply power to a first power supply circuit; or determining that the demand signal of the load is zero, and controlling the second power supply circuit to stop supplying power to the first power supply circuit.

In this embodiment, when it is determined that the demand signal of the load is not zero, the second power supply circuit is controlled to supply power to the first control circuit through the first power supply circuit, and at this time, the first control circuit may control an on/off state of the first switching device of the power circuit, thereby implementing control of pre-charging of the capacitor, so that the power circuit may supply power to the load; when the demand signal of the load is zero, the power supply circuit enters a standby state, and the first power supply circuit and the first control circuit are not powered on, so that the power consumption of the power supply circuit is effectively reduced.

Example four

In the above embodiment, as shown in fig. 8, the control method of the power supply circuit includes:

step 802, determining that the power supply signal does not meet an abnormal condition;

step 804, controlling the on-off state of the first switch device according to the demand signal of the load;

and step 806, controlling the power supply state of the second power supply circuit to the first power supply circuit according to the demand signal of the load.

In this embodiment, the second control circuit controls the on/off state of the first switch device according to the demand signal of the load, and then controls whether the precharge circuit precharges the capacitor, and since whether the precharge circuit operates is controlled by the demand signal of the load, when the demand signal of the load is zero, it can be understood that the precharge circuit does not operate when the load does not need to supply power, and then the power consumption of the power circuit is reduced.

In an embodiment of the present invention, the step of controlling the on/off state of the first switching device according to the demand signal of the load specifically includes: determining a start-stop signal of the load according to the demand signal of the load; and controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at the two ends of the capacitor and the specified threshold value.

In this embodiment, the on-off state of the first switch device is affected by the comparison result between the voltage value at the two ends of the capacitor and the specified threshold, so as to ensure that the capacitor is not damaged due to an excessive charging current when charging, and meanwhile, the on-off state of the first switch device is also affected by the on-off signal determining the load according to the demand signal of the load.

In an embodiment of the present invention, the step of determining a start-stop signal of a load according to a demand signal of the load specifically includes: determining that a demand signal of a load is not zero, and generating a starting signal of the load; or determining that the demand signal of the load is zero, and generating a shutdown signal of the load.

In the embodiment, it is determined that the demand signal of the load is not zero, that is, the load needs to be started, and at this time, a start signal of the load is generated, so that the first switching device acts to pre-charge the capacitor, thereby ensuring that the capacitor is not damaged due to an excessive charging current when being charged; and determining that the demand signal of the load is zero, and generating a shutdown signal of the load so that the first switching device shields the pre-charging circuit and simultaneously controls the pre-charging circuit to be switched off to reduce the power consumption of the power circuit.

In an embodiment of the present invention, the step of controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result between the voltage value at the two ends of the capacitor and the specified threshold specifically includes: determining that a starting signal of a load is received and the voltage value of two ends of a capacitor is greater than or equal to a specified threshold value, and controlling a first switching device to be closed; or determining that the voltage value at the two ends of the capacitor is smaller than a specified threshold value and/or receiving a stop signal of the load, and controlling the first switching device to be opened.

In this embodiment, when it is detected that it is determined that the start signal of the load is received and the voltage value across the capacitor is greater than or equal to the specified threshold value, that is, the load is required to start and the precharge circuit is used to charge the capacitor, the first switch device is controlled to be closed, and the precharge circuit is shielded by using the first switch device. And when the voltage value at the two ends of the capacitor is determined to be smaller than the designated threshold value, namely the pre-charging of the capacitor is not finished, the first switch device is controlled to be opened, so that the pre-charging circuit can continuously charge the capacitor, and the capacitor is further ensured not to be damaged due to overlarge charging current during charging. And when a shutdown signal of the load is received, the first switch device is controlled to be opened so as to further control the second switch device in the pre-charging circuit to be opened, when the second switch device is opened, the pre-charging circuit does not work, and because the shutdown signal of the load is generated when the demand signal of the load is zero, the second power supply circuit does not supply power to the first power supply circuit, so that only the second control circuit of the power supply circuit is in a power-on state, and the standby power consumption of the power supply circuit is effectively reduced.

In one embodiment, after only receiving a shutdown signal of the load and controlling the first switch device to open, the second switch device in the pre-charging circuit is controlled to open, so that the power circuit, the first power circuit and the first control circuit in the power supply circuit are not powered on, and the second control circuit in the power supply circuit is powered on, thereby forming a standby state of the power supply circuit to reduce standby energy consumption.

EXAMPLE five

In one embodiment of the present invention, as shown in fig. 9, a control device 900 of a power supply circuit is provided, including: a controller 902; a memory 904 for storing a computer program; the controller 902 executes a computer program stored in the memory 904 to implement, for example, a step of controlling the second power supply circuit to supply power to the first power supply circuit in accordance with the abnormality judgment result of the power supply signal output from the second power supply circuit.

The control device 900 of the power supply circuit according to the present invention includes: a controller 902; a memory 904 for storing a computer program; the controller 902 executes a computer program stored in the memory 904 to realize, for example, determination of whether or not the second power supply circuit supplies power to the first power supply circuit and the first control circuit by detecting a determination result of detecting whether or not the power supply signal output from the second power supply circuit is abnormal, and therefore, the first power supply circuit and the first control circuit are prevented from being damaged due to power-up failure, and therefore, the reliability of the power supply circuit is improved.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to implement, if it is determined that the power supply signal satisfies the abnormal condition, controlling the second power supply circuit to stop supplying power to the first power supply circuit; or determining that the power supply signal does not meet the abnormal condition, and controlling the second power supply circuit to supply power to the first power supply circuit.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to implement a state of controlling the supply of power from the second power supply circuit to the first power supply circuit, e.g., in accordance with a demand signal of a load.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to effect, for example, determining that the demand signal of the load is not zero, controlling the second power supply circuit to supply power to the first power supply circuit; or determining that the demand signal of the load is zero, and controlling the second power supply circuit to stop supplying power to the first power supply circuit.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to effect, for example, controlling the on and off states of the first switching device in accordance with a demand signal of the load.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to implement, for example, determining a start-stop signal for a load based on a demand signal for the load; and controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at the two ends of the capacitor and the specified threshold value.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to perform the actions of, for example, determining that the demand signal of the load is not zero, generating a turn-on signal for the load; or determining that the demand signal of the load is zero, and generating a shutdown signal of the load.

In one embodiment thereof, the controller 902 executes a computer program stored in the memory 904 to effect, for example, determining that a turn-on signal is received for the load and that the voltage value across the capacitor is greater than or equal to a specified threshold, controlling the first switching device to close; or determining that the voltage value at the two ends of the capacitor is smaller than a specified threshold value and/or receiving a stop signal of the load, and controlling the first switching device to be opened.

EXAMPLE six

In an embodiment of the present invention, an air conditioner is provided, including the power supply circuit according to any one of the above embodiments; and/or a control device of the power supply circuit as in any of the embodiments described above.

The air conditioner provided by the invention comprises the power supply circuit of any one of the embodiments; and/or a control device for a supply circuit as in any one of the above embodiments, thus having a supply circuit as in any one of the above embodiments; and/or any of the above embodiments, and the detailed description thereof is omitted here.

In an embodiment of the present invention, as shown in fig. 10, the air conditioner includes a power filter board, a main control board, a compressor variable frequency driving board, and a fan variable frequency driving board, and the power filter board is provided with a filter circuit and a second power circuit 106, wherein the filter circuit can suppress electromagnetic interference at the grid end and reduce the influence of the electromagnetic interference at the grid end on the stability of the power supply circuit.

Be provided with the Power interface on the main control board, can receive the Power supply signal of Power filter board output, and supply Power for self according to this Power supply signal, supply Power for second control circuit 108 simultaneously, concretely, be provided with first switching device SMPS1 on the main control board, wherein, whether Power up of main control board can be controlled to first switching device SMPS1, second control circuit 108 includes first Controller MCU (Micro Controller Unit) 1 and the Power Ctr port of output control signal, whether Power is supplied Power for compressor frequency conversion drive plate and fan frequency conversion drive plate through Power1 port to second Power circuit 106 that sets up on the Power filter board through Power Ctr port control.

The compressor variable frequency driving board is provided with a first power circuit 104, a power circuit 110, a first control circuit 102 and a first inverter circuit 112, wherein the first power circuit 104 comprises a second switching device SMPS2 which can control whether the compressor variable frequency driving board is powered on or not, when the first power circuit 104 is powered on, power can be supplied to the first control circuit 102, at this time, a second controller MCU2 in the first control circuit 102 is powered on to work, so as to control a pre-charging circuit 1106 of the power circuit 110 and the switching state of a first switching device of the power circuit 110, wherein the power circuit 110 further comprises a capacitor 1102 and a rectifying circuit 1104, the first switching device 1108 is a relay, and the capacitor 1102 is an electrolytic capacitor.

The fan variable-frequency driving board is provided with a second inverter circuit 114 and a third control circuit 116, wherein the third control circuit 116 is powered from the first Power circuit 104 through a Power2 port, and at the moment, a third controller MCU3 in the third control circuit 116 is powered to work.

As shown in fig. 11, when the second control circuit 108 detects that the Power supply signal output by the second Power circuit 106 is abnormal, such as phase loss and phase error, the main board can detect corresponding Power supply voltage and Power phase sequence abnormality, Power _ Ctr control signal output can be stopped, Power1 can not output to the compressor variable frequency drive board, thereby avoiding the damage of the compressor variable frequency drive board caused by abnormal high Power1 voltage due to phase error high voltage, further, the first control circuit 102 can not work to enable the Power circuit 110 not to be electrified, thereby cutting off the whole compressor variable frequency drive board and the fan variable frequency drive board, effectively controlling the damage of the Power supply abnormality to the compressor variable frequency drive board and the fan variable frequency drive board, and improving the stability and reliability of the system. In this case, Power1 will not supply Power to the compressor inverter drive and the fan inverter drive plates even if the demand signal for the load is not zero.

When the input Power is normal, that is, the Power supply signal output by the second Power circuit 106 is not abnormal, each part of the main control board normally works, when the demand signal of the load is zero, the main control board transmits the instruction to the first control circuit 102 and the third control circuit 116 through the Comm1 port and the Comm2 port, and simultaneously the Power _ Ctr stops outputting, and the output of the Power1 is cut off, at this time, the first controller MCU1, the second controller MCU2 and the third controller MCU3 do not work because of no Power supply, only the main control board is in a working state to consume Power at this time, so that the standby Power consumption of the whole machine is greatly reduced, the heating of the components in the first control circuit 102, the third control circuit 116, the Power circuit 110, the first inverter circuit 112 and the second inverter circuit 114 caused by standby is avoided, and the service life and reliability of the electronic components are improved; meanwhile, as the power circuit 110 is in a disconnected state, a loop cannot be formed between the power grid and the load, and the situation that each component in the power supply circuit is impacted by input surge in a standby state and further damaged can be avoided, and the service life and the stability and the reliability of the component are effectively prolonged.

When the input Power is normal, that is, when the Power supply signal output by the second Power circuit 106 is not abnormal, and the demand signal of the load is not zero, the second control circuit 108 outputs a Power _ Ctr signal, at this time, the first Power circuit 104 is powered, the first control circuit 102 and the third control circuit 116 operate, and after the Power supply signal is received by the second control circuit 108, the first inverter circuit 112 and the second inverter circuit 114 are respectively controlled to supply Power through a Comm1 port and a Comm2 port, specifically, after the first control circuit 102 and the third control circuit 116 are ensured to operate stably, the first inverter circuit 112 and the second inverter circuit 114 are controlled to operate, so that the situation that the first control circuit 102, the third control circuit 116, the first inverter circuit 112 and the second inverter circuit 114 are powered on and unstable at the same time to cause abnormal control is avoided, and the stability and reliability of the system are further improved.

Under the condition that an input Power supply is normal, namely under the condition that a Power supply signal output by the second Power supply circuit 106 is not abnormal, a demand signal of a load becomes zero, the second control circuit 108 controls the first inverter circuit 112 and the second inverter circuit 114 to stop supplying Power through a Comm1 port and a Comm2 port respectively, at the moment, the first switch device 1108 is controlled to be turned on, then the second switch device in the pre-charging circuit 1106 is turned on, the Power supply of the compressor variable-frequency drive board and the fan variable-frequency drive board is cut off, after the voltage value at the two ends of the capacitor 1102 is reduced to a safe voltage, the second control circuit 108 outputs a Power _ Ctr closing instruction, at the moment, the compressor variable-frequency drive board and the fan variable-frequency drive board are in a non-working and non-powered state, and therefore the Power consumption of the Power supply circuit.

In the above embodiment, the demand signal of the load of the control device of the power supply circuit includes at least one of a cooling demand, a heating demand, and a wind speed demand.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply circuit, comprising:

a first control circuit;

the first power supply circuit is connected with the first control circuit;

a second power supply circuit connected to the first power supply circuit;

a second control circuit connected to the second power supply circuit, the second control circuit being configured to control the second power supply circuit to supply power to the first power supply circuit according to an abnormality determination result of a power supply signal output by the second power supply circuit.

2. The power supply circuit of claim 1, further comprising:

a power circuit connected with the second power circuit and the first control circuit.

3. The power supply circuit of claim 2, wherein the power circuit comprises:

a capacitor;

a rectifying circuit;

the input end of the pre-charging circuit is connected with the output end of the rectifying circuit, and the output end of the pre-charging circuit is connected with the capacitor;

a first switch device having a first terminal connected to the input of the pre-charge circuit and a second terminal connected to the output of the pre-charge circuit, the first switch device being configured to control the pre-charge circuit to charge the capacitor.

4. The power supply circuit of claim 3, wherein the second control circuit is further configured to control a power supply state of the second power supply circuit to the first power supply circuit according to a demand signal of the load.

5. The power supply circuit of claim 4, wherein the second control circuit is coupled to the first control circuit, the second control circuit further configured to control the on/off state of the first switching device according to a demand signal of the load.

6. The power supply circuit of claim 5, wherein the first control circuit is connected to the first switching device, and the first control circuit is configured to determine a start-stop signal of a load according to a demand signal of the load; and

and controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at the two ends of the capacitor and the specified threshold value.

7. The power supply circuit according to any one of claims 3 to 6, further comprising:

the input end of the first inverter circuit is connected with the capacitor, and the output end of the inverter circuit is configured to output a first operating voltage.

8. The power supply circuit of claim 7, further comprising:

the input ends of the two inverter circuits are connected with the capacitor;

a third control circuit connected with the first power circuit, the second control circuit, and the second inverter circuit, the third control circuit configured to control the second inverter circuit to output a second operating voltage.

9. A control method of a power supply circuit, for use in the power supply circuit according to any one of claims 1 to 8, characterized in that the control method of the power supply circuit comprises:

and controlling the second power supply circuit to supply power to the first power supply circuit according to the abnormal judgment result of the power supply signal output by the second power supply circuit.

10. The method according to claim 9, wherein the step of controlling the second power supply circuit to supply power to the first power supply circuit according to the abnormality determination result of the power supply signal output by the second power supply circuit specifically includes:

determining that the power supply signal meets an abnormal condition, and controlling the second power supply circuit to stop supplying power to the first power supply circuit; or

And determining that the power supply signal does not meet an abnormal condition, and controlling the second power supply circuit to supply power to the first power supply circuit.

11. The method according to claim 10, wherein the abnormal condition comprises one or more of a phase error, a phase loss, an overvoltage, and an undervoltage.

12. The method for controlling a power supply circuit according to claim 9, further comprising:

and controlling the power supply state of the second power supply circuit to the first power supply circuit according to the demand signal of the load.

13. The method according to claim 12, wherein the step of controlling the power supply state of the second power supply circuit to the first power supply circuit according to the demand signal of the load specifically includes:

determining that a demand signal of the load is not zero, and controlling the second power supply circuit to supply power to the first power supply circuit; or

And determining that the demand signal of the load is zero, and controlling the second power supply circuit to stop supplying power to the first power supply circuit.

14. The method of claim 12, wherein the step of controlling the second power supply circuit to supply power to the first power supply circuit according to the demand signal of the load further comprises:

and controlling the opening and closing state of the first switching device according to the demand signal of the load.

15. The method according to claim 14, wherein the step of controlling the on/off state of the first switching device according to the demand signal of the load specifically comprises:

determining a start-stop signal of the load according to the demand signal of the load; and

and controlling the on-off state of the first switching device according to the start-stop signal of the load, the comparison result of the voltage values at two ends of the capacitor and the specified threshold value.

16. The method according to claim 15, wherein the step of determining the start-stop signal of the load according to the demand signal of the load specifically includes:

determining that a demand signal of the load is not zero, and generating a starting signal of the load; or

And determining that the demand signal of the load is zero, and generating a shutdown signal of the load.

17. The method according to claim 15, wherein the step of controlling the on/off state of the first switching device according to the start/stop signal of the load, the comparison result of the voltage value across the capacitor and the specified threshold specifically comprises:

determining that a starting signal of a load is received, and the voltage value of two ends of the capacitor is greater than or equal to a specified threshold value, and controlling the first switch device to be closed; or

And determining that the voltage value of the two ends of the capacitor is smaller than the specified threshold value and/or receiving a stop signal of the load, and controlling the first switch device to be opened.

18. A control device for a power supply circuit, comprising:

a controller;

a memory for storing a computer program;

the controller executes a computer program stored in the memory to implement the steps of the control method of the power supply circuit according to any one of claims 9 to 17.

19. An air conditioner, characterized in that the air conditioner comprises:

the power supply circuit of any one of claims 1 to 8; and/or

Control means for a power supply circuit as claimed in claim 18.

20. The air conditioner of claim 19, wherein the demand signal of the load of the control device of the power supply circuit comprises at least one of a cooling demand, a heating demand, and a wind speed demand.