CN110829818A - Power supply circuit, control method and device of power supply circuit and air conditioner - Google Patents
Power supply circuit, control method and device of power supply circuit and air conditioner Download PDFInfo
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- CN110829818A CN110829818A CN201911125079.XA CN201911125079A CN110829818A CN 110829818 A CN110829818 A CN 110829818A CN 201911125079 A CN201911125079 A CN 201911125079A CN 110829818 A CN110829818 A CN 110829818A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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 capacitor; the input end of the pre-charging circuit is connected with a power supply of the power supply circuit, and the output end of the pre-charging circuit is connected with the first capacitor; a first end of the switching device is connected with the input end of the pre-charging circuit, a second end of the switching device is connected with the output end of the pre-charging circuit, and the switching device is configured to control the pre-charging circuit to charge the first capacitor; the input end of the first switching power supply is connected with the power supply, the output end of the first switching power supply is connected with the power supply end of the switching device, and the first switching power supply is configured to provide working voltage for the power supply end of the switching device according to a power supply signal output by the power supply, so that the influence of the abnormal power supply signal on the operation of the switching device is eliminated.
Description
Technical Field
The invention relates to the technical field of power supply control, in particular to a power supply circuit, a control method of the power supply circuit, a control device of the power supply circuit, an air conditioner and a computer readable storage medium.
Background
In the related technical scheme, a pre-charging circuit is arranged in a power circuit of the air conditioner, the pre-charging circuit is used for limiting the magnitude of charging current in an electrolytic capacitor in the power circuit so as to protect components in the power circuit, and a switch device is also required to be arranged in the pre-charging circuit in the using process, and the switch device is used for controlling whether the pre-charging circuit operates or not.
Those skilled in the art find that when the voltage of a power supply for supplying power to a power circuit of an air conditioner drops or is interrupted briefly, insufficient power supply occurs to a coil in a switching device, so that contact adhesion occurs to the switching device, and therefore, components in the power circuit are easily damaged.
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.
A fifth aspect of the present invention is to provide a computer-readable storage medium.
In view of the above, according to a first aspect of the present invention, there is provided a power supply circuit including: a first capacitor; the input end of the pre-charging circuit is connected with a power supply of the power supply circuit, and the output end of the pre-charging circuit is connected with the first capacitor; a first end of the switching device is connected with the input end of the pre-charging circuit, a second end of the switching device is connected with the output end of the pre-charging circuit, and the switching device is configured to control the pre-charging circuit to charge the first capacitor; the input end of the first switching power supply is connected with the power supply, the output end of the first switching power supply is connected with the power supply end of the switching device, and the first switching power supply is configured to provide working voltage for the power supply end of the switching device according to a power supply signal output by the power supply.
The power supply circuit provided by the invention comprises a first capacitor, a pre-charging circuit, a switch device and a first switch power supply, wherein the input end of the first switch power supply is connected with the power supply, the output end of the first switch power supply is connected with the power supply end of the switch device, and a power supply signal output by the power supply is converted into a working voltage when the switch device operates through the arranged first switch power supply, so that the influence on the operation of the switch device caused by the abnormal power supply signal output by the power supply when the power supply is directly used for supplying power to the switch device is eliminated, the problem of contact adhesion of the switch device caused by insufficient power supply of a coil in the switch device in a related technical scheme is avoided, the probability of misoperation of the switch device is reduced, and the stability 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 technical scheme, the voltage value of the power supply signal is smaller than the first voltage value, and the switching device is turned off; and/or the voltage value of the power supply signal is greater than the second voltage value, and the switching device is turned off; wherein the first voltage value is less than or equal to the second voltage value.
In the technical scheme, a first switching power supply is formed and has a wider input voltage range, and if the voltage value of a power supply signal is smaller than a first voltage value, the first switching power supply stops supplying power to a switching device, or the voltage of the first switching power supply for increasing the switching voltage is smaller than the working voltage, at the moment, the switching device stops supplying power due to insufficient power supply and is in a turn-off state; when the voltage value of the power supply signal is greater than the second voltage value, in order to avoid the damage of the switching device, the first switching power supply stops supplying power to the switching device, and at the moment, the switching device is in an off state because the switching device does not supply power, so that the operation reliability of the power supply circuit is improved.
In any one of the above technical solutions, the first switching power supply includes: the input end of the first rectifying circuit is connected with a power supply, and the first rectifying circuit is configured to charge the second capacitor according to a power supply signal; the second capacitor is connected with the output end of the first rectifying circuit and is configured to supply power to the voltage transformation device; and the input end of the transformation device is connected with the second capacitor, the output end of the transformation device is connected with the power supply end of the switching device, and the transformation device is configured to provide working voltage for the power supply end of the switching device.
In the technical scheme, the first switch circuit comprises a first rectifying circuit, a second capacitor and a transformation device, wherein the first rectifying circuit converts a power supply signal into a corresponding direct current signal and inputs the direct current signal into the second capacitor, so that the second capacitor supplies power to the transformation device, the influence of the power supply signal on the power supply of the switch device can be reduced by using the set second capacitor, and meanwhile, the switch device is provided with electric energy under the condition that the power supply is abnormal, so that when the power supply is powered off, the switch device can execute opening and closing actions to improve the reliability of the power supply circuit.
The voltage transformation device can convert the voltage at two ends of the second capacitor into the supply voltage when the switch device operates, so that the switch device can be electrified and operated conveniently.
In any of the above technical solutions, the first switching power supply further includes: and the first end of the first controller is connected with the second capacitor, the second end of the first controller is connected with the transformation device, and the first controller is configured to control the second capacitor to supply power to the transformation device.
In the technical scheme, the first controller is arranged, and the second capacitor is controlled by the first controller to supply power to the transformation device, so that when a power supply signal output by the power supply is abnormal, the first controller realizes stable output of power supply voltage by the transformation device by controlling the second capacitor to supply power to the transformation device, and further, stable operation of the switching device is ensured.
In any of the above technical solutions, the precharge circuit includes: the first end of the first resistor is connected with the power supply, the second end of the first resistor is connected with the first capacitor, and the first resistor is configured to limit the current of the power supply for charging the first capacitor.
In the technical scheme, the pre-charging circuit comprises the first resistor, wherein when the pre-charging circuit works, the first resistor can limit the current flowing through the first capacitor, the probability that the first capacitor is damaged due to overlarge charging current in the charging process is reduced, and the reliability of the power supply circuit is further improved.
In any of the above technical solutions, the switching device is a general electromagnetic relay.
In the technical scheme, the universal electromagnetic relay is used, so that the cost and the size are reduced, and meanwhile, due to the characteristic of long service life, the reliability of the power supply circuit is improved.
In any of the above technical solutions, the method further includes: and the second controller is connected with the control end of the switching device and is configured to control the on-off state of the switching device and/or the running state of the load of the power supply circuit according to the comparison result of the voltage value at the two ends of the first capacitor and the voltage threshold.
In the technical scheme, the state of a power supply signal of a power supply source is represented by using the voltage value at two ends of a first capacitor, whether the power supply signal is abnormal or not is determined according to the comparison result of the voltage value at two ends of the first capacitor and a voltage threshold, and the on-off state of a switching device and/or the operation state of a load of a power supply circuit is controlled according to the comparison result, so that the pre-charge control of the first capacitor and the power supply control of the load are realized by controlling the on-off state of the switching device and/or the operation state of the load of the power supply circuit, meanwhile, the zero current control of the switching device is realized, and the risk of damage of the switching device is reduced.
In any of the above technical solutions, the method further includes: and the input end of the second switching power supply is connected with the power supply, the output end of the second switching power supply is connected with the power supply end of the second controller, and the second switching power supply is configured to supply power to the second controller.
In the technical scheme, the power supply system further comprises a second switching power supply, wherein an input end of the second switching power supply is connected with an output end of the power supply, an output end of the second switching power supply is connected with a power supply end of the second controller, and the second switching power supply is configured to supply power to the second controller, so that the second controller provides power supply voltage to the power supply end of the second controller according to a power supply signal output by the power supply, and when the power supply signal is abnormal, the second controller has a stable working voltage and performs the function of controlling the operation states of the switching device and the load, the probability of misoperation of the second controller due to the abnormal power supply signal is reduced, and the stability of the power supply circuit is improved.
In any of the above technical solutions, the method further includes: the inverter circuit is connected between the first capacitor and the load in series and is configured to supply power to the load.
In this technical solution, the power supply circuit further includes an inverter circuit, wherein the inverter circuit is connected in series between the first capacitor and the load, and the inverter circuit is configured to supply power to the load, wherein an output terminal of the second controller is connected to the inverter circuit, and the control of the operating state of the load is realized by controlling a conduction state of a power switch in the inverter circuit.
In any of the above technical solutions, the method further includes: and the input end of the second rectifying circuit is connected with the power supply, the output end of the second rectifying circuit is connected with the input end of the pre-charging circuit, and the second rectifying circuit is configured to output a direct current power supply signal to the pre-charging circuit.
In the technical scheme, the power supply circuit further comprises a second rectifying circuit, wherein an input end of the second rectifying circuit is connected with the power supply, an output end of the second rectifying circuit is connected with an input end of the pre-charging circuit, and a power supply signal input by the power supply is converted into a direct current power supply signal, so that the first capacitor is charged under the action of the direct current power supply signal.
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 on-off state of the switching device according to the comparison result of the voltage value at the two ends of the first capacitor and the first voltage threshold.
According to the control method of the power supply circuit, the voltage values at the two ends of the first capacitor are detected, the detected voltage value is compared with the first voltage threshold, and the on-off state of the switch device is determined according to the comparison result, so that whether the pre-charging is finished or not is judged, the possibility that elements in the power supply circuit are damaged due to overlarge current on the first capacitor caused by errors of the on-off time of the switch device is reduced, and the running stability 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 on-off state of the switching device according to the comparison result between the voltage value at the two ends of the first capacitor and the first voltage threshold specifically includes: determining that the voltage value at two ends of the first capacitor is greater than or equal to a first voltage threshold value, and controlling the switching device to be switched on; or determining that the voltage value at the two ends of the first capacitor is smaller than the first voltage threshold value, and controlling the switching device to be switched off.
In the technical scheme, when the voltage value of the two ends of the first capacitor is detected to be larger than or equal to the first voltage threshold, the switching device is controlled to be switched on, and when the voltage value of the two ends of the first capacitor is detected to be smaller than the first voltage threshold, the switching device is controlled to be switched off, namely, an accurate switching control logic of the switching device is given, so that the possibility that elements in the power supply circuit are damaged due to overlarge current on the first capacitor caused by errors of the switching on or switching off of the switching device is reduced, and the running stability of the power supply circuit is improved.
In any of the above technical solutions, before the step of controlling the switching device to turn off, the method further includes: controlling the load to stop running; and/or after the step of controlling the switching device to be turned on, further comprising: and controlling the load operation.
In this technical solution, before the step of controlling the switching device to turn off, the method further includes: after the step of controlling the load to stop operating and/or controlling the switching device to be turned on, the method further comprises the following steps: the load operation is controlled to realize that the current flowing through the switching device is small and almost zero before the switching device acts, so that the risk of damage of the switching device is reduced, and the operation stability of the power supply circuit is improved.
In any of the above technical solutions, the step of controlling the load to stop operating or controlling the load to operate specifically includes: determining that the voltage value at two ends of the first capacitor is greater than or equal to a second voltage threshold value, and controlling the load to operate; or determining that the voltage value at the two ends of the first capacitor is smaller than the second voltage threshold value, and controlling the load to stop running.
In the technical scheme, the relation between the voltage values at the two ends of the first capacitor and the second voltage threshold is compared, so that the under-voltage protection of the power supply circuit is realized, the probability that the load works under the condition of insufficient voltage supply and is damaged is reduced, and meanwhile, the service life of the load is prolonged.
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 effect, for example, controlling the on-off state of the switching device in accordance with a comparison of a voltage value across the first capacitor to a voltage threshold.
The control device of the power supply circuit comprises a controller and a memory, wherein the controller executes a computer program stored in the memory to realize that the pre-charging is judged to be finished or not by detecting the voltage values at the two ends of the first capacitor and comparing the detected voltage value with a voltage threshold value, and then determining the on-off state of the switch device according to the comparison result, so that the possibility of damage of the element in the power supply circuit due to overlarge current on the first capacitor caused by error on or off time of the switch device is reduced, and the operation stability 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, for example, determining that a voltage value across the first capacitor is greater than or equal to a voltage threshold, controlling the switching device to turn on; or determining that the voltage value at the two ends of the first capacitor is smaller than the voltage threshold value, and controlling the switching device to be switched off.
In the technical scheme, when the voltage value of the two ends of the first capacitor is detected to be larger than or equal to the voltage threshold, the switching device is controlled to be switched on, and when the voltage value of the two ends of the first capacitor is detected to be smaller than the voltage threshold, the switching device is controlled to be switched off, namely, an accurate switching control logic of the switching device is given, so that the possibility that the element in the power supply circuit is damaged due to overlarge current on the first capacitor caused by the error of the switching-on or switching-off time of the switching device is reduced, and the running stability of the power supply circuit is improved.
In any of the above solutions, before the controller executes the computer program stored in the memory to implement the step of controlling the switching device to turn off, the method further includes: controlling the load to stop running; and/or after the step of controlling the switching device to be turned on, further comprising: and controlling the load operation.
In this technical solution, before the step of controlling the switching device to turn off, the method further includes: after the step of controlling the load to stop operating and/or controlling the switching device to be turned on, the method further comprises the following steps: the load operation is controlled to realize that the current flowing through the switching device is small and almost zero before the switching device acts, so that the risk of damage of the switching device is reduced, and the operation stability of the power supply circuit is improved.
In any of the above solutions, the controller executes a computer program stored in the memory to implement, for example, determining that the voltage value across the first capacitor is greater than or equal to the second voltage threshold, controlling the load to operate; or determining that the voltage value at the two ends of the first capacitor is smaller than the second voltage threshold value, and controlling the load to stop running.
In the technical scheme, the relation between the voltage values at the two ends of the first capacitor and the second voltage threshold is compared, so that the under-voltage protection of the power supply circuit is realized, the probability that the load works under the condition of insufficient voltage supply and is damaged is reduced, and meanwhile, the service life of the load is prolonged.
In a fourth aspect of the invention, an air conditioner is proposed, comprising a supply circuit according to any of the above and/or a control device of a supply circuit according to any of the above.
The air conditioner provided by the invention comprises the power supply circuit and/or the control device of the power supply circuit, so that all the beneficial technical effects of the control device of the power supply circuit and/or the power supply circuit are achieved, and the description is omitted.
In the above technical solution, the power supply circuit and/or the control device of the power supply circuit is/are disposed on an outdoor unit of the air conditioner.
In a fifth aspect of the invention, a computer-readable storage medium is proposed, on which a computer program is stored, which, when executed, implements the steps of the control method of the power supply circuit as defined in any one of the above.
The computer-readable storage medium provided by the present invention stores thereon a computer program, and when the computer program is executed, the steps of the method for controlling a power supply circuit according to any of the above embodiments are implemented, so that all the advantageous technical effects of the method for controlling a power supply circuit according to any of the above embodiments are achieved, and are not described herein again.
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 first switching power supply according to one embodiment of the invention;
FIG. 3 shows a flow diagram of a control method of a power supply circuit according to one embodiment of the invention;
FIG. 4 shows a flow diagram of a method of controlling a power supply circuit according to another embodiment of the invention;
FIG. 5 shows a flow diagram of a control method of a power supply circuit according to yet another embodiment of the invention;
fig. 6 shows a schematic block diagram of a control device of a supply circuit according to an embodiment of the invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
100 power supply circuit, 102 first capacitor, 104 pre-charge circuit, 106 switching device, 108 first switching power supply, 1082 first rectifying circuit, 1084 second capacitor, 1086 transformer, 1088 first controller, 110 inverter circuit, 112 second rectifying 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, there is provided a power supply circuit 100 including: a first capacitor 102; the input end of the pre-charging circuit 104 is connected with the power supply of the power supply circuit 100, and the output end of the pre-charging circuit 104 is connected with the first capacitor 102; a switching device 106, a first terminal of the switching device 106 is connected to the input terminal of the pre-charge circuit 104, a second terminal of the switching device 106 is connected to the output terminal of the pre-charge circuit 104, the switching device 106 is configured to control the pre-charge circuit 104 to charge the first capacitor 102; a first switching power supply 108, an input terminal of the first switching power supply 108 is connected to the power supply, an output terminal of the first switching power supply 108 is connected to the power supply terminal of the switching device 106, and the first switching power supply 108 is configured to provide an operating voltage to the power supply terminal of the switching device 106 according to a power supply signal output by the power supply.
The power supply circuit 100 provided by the present invention includes a first capacitor 102, a pre-charge circuit 104, a switching device 106 and a first switching power supply 108, wherein an input terminal of the first switching power supply 108 is connected to a power supply, an output terminal of the first switching power supply 108 is connected to a power supply terminal of the switching device 106, and a power supply signal output by the power supply is converted into a working voltage when the switching device 106 operates by the first switching power supply 108.
In one embodiment, the voltage value of the power supply signal is less than the first voltage value, and the switching device 106 is turned off; and/or the voltage value of the power supply signal is greater than the second voltage value, the switching device 106 is turned off; wherein the first voltage value is less than or equal to the second voltage value.
Specifically, when the power supply signal output by the power supply is abnormal, where the abnormality may be a voltage sag, a short interruption, a voltage change, or a disconnection state of the power supply from the power supply circuit 100, the voltage input to the first switching power supply 108 may change, and the power supply formed by the set first switching power supply 108 and having a wide input voltage range and a stable voltage output, if the voltage value of the power supply signal is smaller than the first voltage value, the first switching power supply 108 stops supplying power to the switching device 106, or the voltage increased by the first switching power supply 108 to the switching voltage is smaller than the operating voltage, and at this time, the switching device 106 stops supplying power due to insufficient power supply, and is in an off state; when the voltage value of the power supply signal is greater than the second voltage value, in order to avoid the switch device 106 from being damaged, the first switch power supply 108 stops supplying power to the switch device 106, and at this time, the switch device 106 is in an off state because the power supply is not supplied, and it can be further understood that, when the power supply is abnormal, because the first switch power supply 108 is provided, the voltage supplied to the switch device 106 is still maintained at the value of the working voltage, and therefore. The influence of abnormal power supply signals output by the power supply on the operation of the switching device 106 when the power supply is directly used for supplying power to the switching device 106 can be avoided, the problem that the contact adhesion of the switching device 106 is caused by insufficient power supply of a coil in the switching device 106 in related embodiments is avoided, the probability of misoperation of the switching device 106 is reduced, and the stability of the power supply circuit 100 is improved.
In one embodiment, the precharge circuit 104 includes: the first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the first capacitor 102, and the first resistor is configured to limit the amount of current that the power supply charges the first capacitor 102.
In this embodiment, the pre-charge circuit 104 includes a first resistor, wherein when the pre-charge circuit 104 operates, the first resistor can limit the current flowing through the first capacitor 102, so as to reduce the probability of damage to the first capacitor 102 due to an excessive charging current during the charging process, thereby improving the reliability of the power supply circuit 100.
In one embodiment, the switching device 106 is a general purpose electromagnetic relay.
In this embodiment, the use of a general electromagnetic relay reduces the cost and size, while improving the reliability of the power supply circuit 100 due to its long life.
In one embodiment, the method further comprises: a second controller (not shown) connected to the control terminal of the switching device 106, the second controller being configured to control the on-off state of the switching device 106 and/or the operating state of the load of the power supply circuit 100 according to a comparison result of the voltage value across the first capacitor 102 and the voltage threshold.
In this embodiment, the voltage value across the first capacitor 102 is used to represent the state of the power supply signal of the power supply source, and whether the power supply signal is abnormal is determined according to the comparison result between the voltage value across the first capacitor 102 and the voltage threshold, and the on-off state of the switching device 106 and/or the operating state of the load of the power supply circuit 100 is controlled according to the comparison result, so that the pre-charge control of the first capacitor 102 and the power supply control of the load are realized by controlling the on-off state of the switching device 106 and/or the operating state of the load of the power supply circuit 100, and meanwhile, the zero-current control of the switching device 106 is realized, and the risk of damage to the switching device 106 is reduced.
In one embodiment, the method further comprises: and a second switching power supply (not shown), an input terminal of which is connected with the power supply, and an output terminal of which is connected with a power supply terminal of the second controller, the second switching power supply being configured to supply power to the second controller.
In this embodiment, the power supply further includes a second switching power supply, where an input terminal of the second switching power supply is connected to an output terminal of the power supply, an output terminal of the second switching power supply is connected to a power supply terminal of the second controller, and the second switching power supply is configured to supply power to the second controller, so that the second controller provides a power supply voltage to the power supply terminal of the second controller according to a power supply signal output by the power supply, so that when the power supply signal is abnormal, the second controller has a stable working voltage and performs an operation state control function of the switching device 106 and the load, thereby reducing a probability of a malfunction of the second controller due to the abnormal power supply signal, and improving stability of the power supply circuit 100.
In one embodiment, as shown in fig. 2, the second switching power supply is the same as the first switching power supply 108, e.g., supplied via VCC1 or VCC 2.
In one embodiment, the second switching power supply and the first switching power supply 108 are connected to the same winding of the power supply, or may be connected to different windings.
In one embodiment, the method further comprises: the inverter circuit 110, the inverter circuit 110 is connected in series between the first capacitor 102 and the load, and the inverter circuit 110 is configured to supply power to the load.
In this embodiment, the power supply circuit 100 further includes an inverter circuit 110, wherein the inverter circuit 110 is connected in series between the first capacitor 102 and the load, and the inverter circuit 110 is configured to supply power to the load, wherein an output end of the second controller is connected to the inverter circuit 110, and the control of the operating state of the load is realized by controlling a conducting state of a power switch in the inverter circuit 110.
In one embodiment, the inverter circuit 110 includes a power switch, wherein the second controller is connected to the power switch of the inverter circuit 110 and controls the operating state of the load by controlling the on state of the power switch.
In one embodiment, the method further comprises: and a second rectifying circuit 112, an input end of the second rectifying circuit 112 is connected with the power supply, an output end of the second rectifying circuit 112 is connected with an input end of the pre-charging circuit 104, and the second rectifying circuit 112 is configured to output a direct current power supply signal to the pre-charging circuit 104.
In this embodiment, the power supply circuit 100 further includes a second rectification circuit 112, wherein an input terminal of the second rectification circuit 112 is connected to the power supply, and an output terminal of the second rectification circuit 112 is connected to an input terminal of the pre-charge circuit 104, so as to convert the power supply signal input by the power supply into the dc power supply signal, so that the first capacitor 102 is charged under the action of the dc power supply signal.
The second rectifying circuit 112 is a bridge circuit or a bridge stack including diodes.
In one embodiment, the first capacitor 102 includes an electrolytic capacitor E1 and an electrolytic capacitor E2, and a second resistor R2 and a third resistor R3 are provided to provide a stable voltage to the inverter circuit 110.
Example two
In any of the above embodiments, as shown in fig. 2, the first switching power supply 108 includes: a first rectifying circuit 1082, an input end of the first rectifying circuit 1082 being connected to a power supply source, the first rectifying circuit 1082 being configured to charge a second capacitor 1084 according to a power supply signal; a second capacitor 1084, the second capacitor 1084 being connected to the output of the first rectifier circuit 1082, the second capacitor 1084 being configured to supply power to the transforming device 1086; the transformer 1086, an input terminal of the transformer 1086 is connected to the second capacitor 1084, an output terminal of the transformer 1086 is connected to a power supply terminal of the switching device 106, and the transformer 1086 is configured to provide the operating voltage to the power supply terminal of the switching device 106.
In this embodiment, the first switch circuit includes a first rectifying circuit 1082, a second capacitor 1084 and a transforming device 1086, wherein the first rectifying circuit 1082 converts the power supply signal into a corresponding dc signal, and inputs the dc signal to the second capacitor 1084, so that the second capacitor 1084 supplies power to the transforming device 1086, and the second capacitor 1084 is disposed to reduce the influence of the power supply signal on the power supply of the switch device 106, and meanwhile, in case of an abnormal power supply, the switch device 106 is supplied with power, so that when the power supply is powered off, the switch device 106 can perform an opening and closing action to improve the reliability of the power supply circuit 100.
The first rectifier circuit 1082 is a bridge circuit (or bridge stack) including diodes.
In one embodiment, the second capacitor 1084 is an electrolytic capacitor, and the capacitance thereof determines the ripple voltage of the voltage value across the first resistor, and also affects the duration of the operation of the switching device 106 provided by the first switching power supply 108 when the power supply signal is abnormal. The larger the capacity of the second capacitor 1084, the more energy is stored, and the less the operating voltage provided by the first switching power supply 108 is affected by the power supply abnormality. The larger the capacity of the electrolytic capacitor, the longer the first switching power supply 108 operates to provide the switching device 106 when the power supply is disconnected from the power supply circuit 100.
The transformer 1086 is configured to transform the voltage across the second capacitor 1084 into a supply voltage for the switching device during operation, so that the switching device 106 can be powered.
In one embodiment, the transformer 1086 is a transformer, which specifically includes a primary coil and a secondary coil, wherein one end of the primary coil is connected to a first end of a second capacitor 1084, the other end of the primary coil is connected to a second end of the second capacitor 1084 through a first controller 1088, the first end of the secondary coil is grounded, and the second end of the secondary coil is connected to the coil of the switching device 106.
In an embodiment of the invention, the first switching power supply 108 includes a fourth resistor R4, a third capacitor C1, and a first diode D1, wherein a first end of the fourth resistor is connected to a first end of the third capacitor and then connected to a first end of the second capacitor 1084, a second end of the fourth resistor is connected to a second end of the third capacitor and then connected to a cathode of the first diode, an anode of the first diode is connected to the first controller 1088, and the fourth resistor, the third capacitor, and the first diode are arranged to filter a high voltage spike existing when the second capacitor 1084 supplies power to the transformer 1086, thereby improving stability of the operating voltage.
In any of the above embodiments, the first switching power supply 108 further comprises: a first controller 1088, a first end of the first controller 1088 coupled to the second capacitor 1084, a second end of the first controller 1088 coupled to the voltage transformation device 1086, the first controller 1088 configured to control the second capacitor 1084 to supply power to the voltage transformation device 1086.
In this embodiment, the first controller 1088 is provided, and the second capacitor 1084 is controlled by the first controller 1088 to supply power to the voltage transformation device 1086, so that when an abnormal power supply signal output by the power supply occurs, the first controller 1088 controls the second capacitor 1084 to supply power to the voltage transformation device 1086, so as to achieve stable output of the voltage transformation device 1086, and thus ensure stable operation of the switching device 106.
Specifically, the first controller 1088 has a first port 1, a second port 2, a third port 3, a fourth port 4, a fifth port 5, a sixth port 6, a seventh port 7, and an eighth port 8, where the fifth port 5, the sixth port 6, the seventh port 7, and the eighth port 8 are respectively connected to the second end of the second capacitor 1084 and then grounded, the first port 1 is an EN/UV port, the second port 2 is a BP/M port, the third port 3 does not show a pin, and the fourth port 4 is connected to the second end of the primary coil, where when the EN/UV port is configured to detect the operating voltage output to the switching device 106, and control the conduction state of the primary coil according to the detection result, thereby implementing feedback control of the operating voltage output by the switching device 106. The BP/M port, when detecting that the current flowing therethrough exceeds the off-current, an internal latch shutdown circuit provided in the first controller 1088 is activated to protect the switching device 106.
EXAMPLE III
In an embodiment of the present invention, as shown in fig. 3, a control method for the power supply circuit of any one of the above embodiments is provided, where the control method for the power supply circuit includes:
step 302: and controlling the on-off state of the switching device according to the comparison result of the voltage value at the two ends of the first capacitor and the first voltage threshold.
According to the control method of the power supply circuit, the voltage values at the two ends of the first capacitor are detected, the detected voltage value is compared with the first voltage threshold, and the on-off state of the switch device is determined according to the comparison result, so that whether the pre-charging is finished or not is judged, the possibility that elements in the power supply circuit are damaged due to overlarge current on the first capacitor caused by errors of the on-off time of the switch device is reduced, and the running stability of the power supply circuit is improved.
In one embodiment of the present invention, as shown in fig. 4, a control method of a power supply circuit includes:
step 402: determining that the voltage value at two ends of the first capacitor is greater than or equal to a first voltage threshold value, and controlling the switching device to be switched on; or determining that the voltage value at the two ends of the first capacitor is smaller than the first voltage threshold value, and controlling the switching device to be switched off.
In this embodiment, when it is detected that the voltage value across the first capacitor is greater than or equal to the first voltage threshold, the switching device is controlled to be turned on, and when it is detected that the voltage value across the first capacitor is determined to be less than the first voltage threshold, the switching device is controlled to be turned off, that is, an accurate switching control logic is given to the switching device, so that the possibility of component damage in the power supply circuit due to an excessive current on the first capacitor caused by an error in the timing of turning on or off the switching device is reduced, and the stability of the operation of the power supply circuit is improved.
In one embodiment of the present invention, as shown in fig. 5, a control method of a power supply circuit includes:
step 502: determining that the voltage value at two ends of the first capacitor is greater than or equal to a first voltage threshold, controlling the switching device to be switched on, and controlling the load to run; or determining that the voltage value at the two ends of the first capacitor is smaller than the first voltage threshold, and controlling the switching device to be switched off after the load stops running.
In this embodiment, before the step of controlling the switching device to be turned off, the method further includes: after the step of controlling the load to stop operating and/or controlling the switching device to be turned on, the method further comprises the following steps: the load operation is controlled to realize that the current flowing through the switching device is small and almost zero before the switching device acts, so that the risk of damage of the switching device is reduced, and the operation stability of the power supply circuit is improved.
In any of the above embodiments, the step of controlling the load to stop operating or controlling the load to operate specifically includes: determining that the voltage value at two ends of the first capacitor is greater than or equal to a second voltage threshold value, and controlling the load to operate; or determining that the voltage value at the two ends of the first capacitor is smaller than the second voltage threshold value, and controlling the load to stop running.
In the embodiment, the relation between the voltage value at the two ends of the first capacitor and the second voltage threshold is compared, so that the undervoltage protection of the power supply circuit is realized, the probability that the load works under the condition of insufficient supply voltage and is damaged is reduced, and meanwhile, the service life of the load is prolonged.
In one embodiment, when the power supply signal output by the power supply is detected to be abnormal, the under-voltage protection of the power supply circuit is started, the load is controlled to stop running, when the voltage at two ends of the second capacitor drops below the second voltage value, the voltage output by the first switching power supply is smaller than the working voltage of the switching device, and at the moment, the switching device is turned off due to insufficient power supply.
In an embodiment of the invention, the voltage across the second capacitor does not drop below the second voltage value, and at this time, the voltage output by the first switching power supply is not less than the operating voltage of the switching device, that is, the switching device is not turned off due to insufficient power supply.
Example four
In one embodiment of the present invention, as shown in fig. 6, a control device 600 of a power supply circuit is provided, including: a controller 602; a memory 604 for storing a computer program; the controller 602 executes a computer program stored in the memory 604 to enable controlling the on-off state of the switching device, e.g. in dependence of a comparison of a voltage value across the first capacitor with a voltage threshold.
The control device 600 of the power supply circuit provided by the invention comprises a controller 602 and a memory 604, wherein the controller 602 executes a computer program stored in the memory 604 to realize that the pre-charging is judged to be finished or not by detecting the voltage value at two ends of the first capacitor, comparing the detected voltage value with a voltage threshold value and then determining the on-off state of the switch device according to the comparison result, so that the possibility that the element in the power supply circuit is damaged due to overlarge current on the first capacitor caused by the error on or off time of the switch device is reduced, and the operation stability of the power supply circuit is improved.
In addition, the control device 600 of the power supply circuit in the above embodiment of the present invention may further have the following additional technical features:
in the above embodiments, the controller 602 executes the computer program stored in the memory 604 to implement, for example, determining that the voltage value across the first capacitor is greater than or equal to the voltage threshold, controlling the switching device to turn on; or determining that the voltage value at the two ends of the first capacitor is smaller than the voltage threshold value, and controlling the switching device to be switched off.
In this embodiment, when it is detected that the voltage value at the two ends of the first capacitor is greater than or equal to the voltage threshold, the switching device is controlled to be turned on, and when it is detected that the voltage value at the two ends of the first capacitor is determined to be less than the voltage threshold, the switching device is controlled to be turned off, that is, an accurate switching control logic is given to the switching device, so that the possibility that the component in the power supply circuit is damaged due to an excessive current on the first capacitor caused by an error in the timing of turning on or off the switching device is reduced, and the stability of the operation of the power supply circuit is improved.
In any of the above embodiments, before the controller 602 executes the computer program stored in the memory 604 to implement the steps of, for example, controlling the switching device to be turned off, the method further includes: controlling the load to stop running; and/or after the step of controlling the switching device to be turned on, further comprising: and controlling the load operation.
In this embodiment, before the step of controlling the switching device to be turned off, the method further includes: after the step of controlling the load to stop operating and/or controlling the switching device to be turned on, the method further comprises the following steps: the load operation is controlled to realize that the current flowing through the switching device is small and almost zero before the switching device acts, so that the risk of damage of the switching device is reduced, and the operation stability of the power supply circuit is improved.
In any of the above embodiments, the controller 602 executes a computer program stored in the memory 604 to implement, for example, determining that the voltage value across the first capacitor is greater than or equal to the second voltage threshold, controlling the load to operate; or determining that the voltage value at the two ends of the first capacitor is smaller than the second voltage threshold value, and controlling the load to stop running.
In the embodiment, the relation between the voltage value at the two ends of the first capacitor and the second voltage threshold is compared, so that the undervoltage protection of the power supply circuit is realized, the probability that the load works under the condition of insufficient supply voltage and is damaged is reduced, and meanwhile, the service life of the load is prolonged.
EXAMPLE five
In an embodiment of the invention, an air conditioner is provided, comprising the power supply circuit of any one of the above and/or a control device of the power supply circuit of any one of the above.
The air conditioner provided by the invention comprises the power supply circuit and/or the control device of the power supply circuit, wherein the power supply circuit and/or the control device of the power supply circuit are connected with a load of the air conditioner to drive the load to operate, so that the air conditioner has all the beneficial technical effects of the power supply circuit and/or the control device of the power supply circuit, and the description is omitted.
Wherein, the load can be a compressor and also can be a fan.
In the above embodiments, the power supply circuit and/or the control device of the power supply circuit is provided in the outdoor unit of the air conditioner.
EXAMPLE six
In an embodiment of the invention, a computer-readable storage medium is proposed, on which a computer program is stored, which, when executed, carries out the steps of the control method of the power supply circuit as defined in any one of the above.
The computer-readable storage medium provided by the present invention stores thereon a computer program, and when the computer program is executed, the steps of the method for controlling a power supply circuit according to any of the above embodiments are implemented, so that all the advantageous technical effects of the method for controlling a power supply circuit according to any of the above embodiments are achieved, and are not described herein again.
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 (17)
1. A power supply circuit, comprising:
a first capacitor;
the input end of the pre-charging circuit is connected with a power supply of the power supply circuit, and the output end of the pre-charging circuit is connected with the first capacitor;
a switching device, a first terminal of the switching device being connected to an input terminal of the pre-charge circuit, a second terminal of the switching device being connected to an output terminal of the pre-charge circuit, the switching device being configured to control the pre-charge circuit to charge the first capacitor;
the input end of the first switching power supply is connected with the power supply, the output end of the first switching power supply is connected with the power supply end of the switching device, and the first switching power supply is configured to provide working voltage for the power supply end of the switching device according to a power supply signal output by the power supply.
2. The power supply circuit of claim 1,
the voltage value of the power supply signal is smaller than a first voltage value, and the switching device is turned off; and/or
The voltage value of the power supply signal is greater than a second voltage value, and the switching device is turned off;
wherein the first voltage value is less than or equal to the second voltage value.
3. The power supply circuit according to claim 1, wherein the first switching power supply comprises:
a first rectifying circuit, an input end of which is connected with the power supply, the first rectifying circuit being configured to charge a second capacitor according to the power supply signal;
the second capacitor is connected with the output end of the first rectifying circuit, and the second capacitor is configured to supply power to a voltage transformation device;
the input end of the transformation device is connected with the second capacitor, the output end of the transformation device is connected with the power supply end of the switch device, and the transformation device is configured to provide working voltage for the power supply end of the switch device.
4. The power supply circuit of claim 3, wherein the first switching power supply further comprises:
a first controller, a first end of the first controller being connected to the second capacitor, a second end of the first controller being connected to the transforming device, the first controller being configured to control the second capacitor to supply power to the transforming device.
5. The power supply circuit according to any one of claims 1 to 4, wherein the precharge circuit includes:
the first end of the first resistor is connected with the power supply, the second end of the first resistor is connected with the first capacitor, and the first resistor is configured to limit the current of the power supply for charging the first capacitor.
6. Supply circuit according to any of claims 1 to 4, characterized in that the switching device is a general-purpose electromagnetic relay.
7. The power supply circuit according to any one of claims 1 to 4, further comprising:
a second controller connected to the control terminal of the switching device, the second controller configured to control an on/off state of the switching device and/or an operation state of a load of the power supply circuit according to a comparison result of a voltage value across the first capacitor and a voltage threshold.
8. The power supply circuit of claim 7, further comprising:
a second switching power supply, an input terminal of the second switching power supply being connected with the power supply, an output terminal of the second switching power supply being connected with a power supply terminal of the second controller, the second switching power supply being configured to supply power to the second controller.
9. The power supply circuit of claim 7, further comprising:
an inverter circuit connected in series between the first capacitance and the load, the inverter circuit configured to supply power to the load.
10. The power supply circuit of claim 7, further comprising:
the input end of the second rectifying circuit is connected with the power supply, the output end of the second rectifying circuit is connected with the input end of the pre-charging circuit, and the second rectifying circuit is configured to output a direct current power supply signal to the pre-charging circuit.
11. A control method of a power supply circuit for the power supply circuit according to any one of claims 7 to 10, characterized by comprising:
and controlling the on-off state of the switching device according to the comparison result of the voltage value at the two ends of the first capacitor and the first voltage threshold.
12. The method according to claim 11, wherein the step of controlling the on/off state of the switching device according to the comparison result between the voltage value across the first capacitor and the first voltage threshold specifically comprises:
determining that the voltage value at two ends of the first capacitor is greater than or equal to the first voltage threshold value, and controlling the switching device to be switched on; or
And determining that the voltage value at two ends of the first capacitor is smaller than the first voltage threshold value, and controlling the switching device to be switched off.
13. The control method of a power supply circuit according to claim 12,
before the step of controlling the switching device to be turned off, the method further includes:
controlling the load to stop running; and/or
After the step of controlling the switching device to be turned on, the method further includes: and controlling the load to operate.
14. The control method of a power supply circuit according to claim 13,
the step of controlling the load to stop operating or controlling the load to operate specifically includes:
determining that the voltage value at two ends of the first capacitor is greater than or equal to a second voltage threshold value, and controlling the load to operate; or
And determining that the voltage value at two ends of the first capacitor is smaller than a second voltage threshold value, and controlling the load to stop running.
15. 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 11 to 14.
16. An air conditioner, comprising:
the power supply circuit according to any one of claims 1 to 10; and/or
Control means for a power supply circuit as claimed in claim 15.
17. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed, implements the steps of the control method of the power supply circuit according to any one of claims 11 to 14.
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| CN201911125079.XA CN110829818A (en) | 2019-11-18 | 2019-11-18 | Power supply circuit, control method and device of power supply circuit and air conditioner |
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| CN201911125079.XA CN110829818A (en) | 2019-11-18 | 2019-11-18 | Power supply circuit, control method and device of power supply circuit and air conditioner |
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