CN110829817B - Control circuit, control method and device of control circuit and air conditioner - Google Patents
Control circuit, control method and device of control circuit and air conditioner Download PDFInfo
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- CN110829817B CN110829817B CN201911124932.6A CN201911124932A CN110829817B CN 110829817 B CN110829817 B CN 110829817B CN 201911124932 A CN201911124932 A CN 201911124932A CN 110829817 B CN110829817 B CN 110829817B
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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
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention provides a control circuit, a control method of the control circuit, a control device of the control circuit and an air conditioner. Wherein, the control circuit includes: a capacitor configured to supply power to a load; the pre-charging circuit is configured to charge the capacitor, a first end of the pre-charging circuit is connected with the bus line, and a second end of the pre-charging circuit is connected with the capacitor; the first switching device is connected between the first end of the pre-charging circuit and a bus line or between the second end of the pre-charging circuit and the capacitor in series; and the control device is connected with the control end of the first switching device and is configured to control the conducting state of the first switching device according to the load demand information, and when no load demand exists, the first switching device is controlled to be switched off, namely the pre-charging circuit stops charging the capacitor, so that the circuit where the capacitor is located cannot be electrified, and the power consumption of the control circuit is further reduced.
Description
Technical Field
The invention relates to the technical field of electric appliance control, in particular to a control circuit, a control method of the control circuit, a control device of the control circuit and an air conditioner.
Background
In the related technical scheme, no matter the air conditioner is in a working state or a standby state, a frequency conversion main loop of the air conditioner is always in a power-on state, devices such as an electrolytic capacitor and a voltage-sharing resistor in the frequency conversion main loop can generate certain power consumption and heat, the temperature in an electric control cavity can be increased due to the emitted heat, the working stability of the frequency conversion main loop is affected, meanwhile, the frequency conversion main loop can form a loop when being powered on, and components of the frequency conversion main loop can be damaged when other devices in the frequency conversion main loop are switched or surges are generated in a power grid.
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 control circuit.
In a second aspect of the present invention, a control method of a control circuit is provided.
A third aspect of the present invention is to provide a control apparatus for a control 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 control circuit comprising: a capacitor configured to supply power to a load; the pre-charging circuit is configured to charge the capacitor, a first end of the pre-charging circuit is connected with the bus line, and a second end of the pre-charging circuit is connected with the capacitor; the first switching device is connected between the first end of the pre-charging circuit and a bus line or between the second end of the pre-charging circuit and the capacitor in series; and the control device is connected with the control end of the first switching device and is configured to control the conducting state of the first switching device according to the load demand information.
The invention provides a control circuit, which comprises a capacitor, a pre-charging circuit, a first switching device and a control device, wherein the pre-charging circuit is configured to charge the capacitor, the pre-charging circuit is arranged to effectively limit the current flowing through the capacitor so as to protect the safety of other devices in a loop of the capacitor, and reduce the occurrence of situations such as overcurrent burnout, and the like, the technical scheme of the application is that the first switching device is arranged between the first end of the pre-charging circuit and a bus line or between the second end of the pre-charging circuit and the capacitor, and the pre-charging circuit is controlled to charge the capacitor according to load demand information, specifically, when no load demand exists, the first switching device is controlled to be cut off, namely the pre-charging circuit stops charging the capacitor, therefore, the circuit of the capacitor cannot be electrified, and the circuit of the capacitor does not consume power, therefore, the defects existing in the prior stage can be overcome, and meanwhile, the service life of each component in the circuit where the capacitor is located is prolonged.
In addition, the control 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 precharge circuit includes: a first resistor configured to limit current flowing through the capacitor.
In the technical scheme, the first resistor is arranged in the pre-charging circuit, wherein the first resistor can limit the current flowing from the pre-charging circuit to the capacitor for charging, and further ensures that each component in the circuit where the pre-charging circuit and the capacitor are located cannot be damaged due to overcurrent when the capacitor is charged, so that the reliability of the control circuit is improved.
In any of the above technical solutions, the control circuit further includes: the first end of the second switching device is connected with the bus line, and the second end of the second switching device is connected with the capacitor; the control device is further configured to: and controlling the conduction state of the second switching device according to the comparison result of the bus voltage and the voltage threshold.
In this technical solution, the control circuit further includes a second switching device, wherein a first end of the second switching device is connected to the bus line, and a second end of the second switching device is connected to the capacitor, that is, the precharge circuit and the first switching device connected in series and the second switching device form a parallel relationship, and whether the precharge circuit finishes charging the capacitor can be controlled according to a conduction state of the second switching device, specifically, the control device is further configured to: and controlling the conduction state of the second switching device according to the comparison result of the bus voltage and the voltage threshold, namely determining whether to finish pre-charging according to the comparison result of the bus voltage and the voltage threshold so as to reduce the risk of damage to each component in the circuit where the capacitor is positioned due to overcurrent.
In any of the above technical solutions, the method further includes: and the inverter circuit is arranged between the capacitor and the load, the input end of the inverter circuit is connected with the capacitor, and the output end of the inverter circuit is connected with the load.
In this technical scheme, the control circuit still includes inverter circuit, and wherein, inverter circuit sets up between electric capacity and load to supply power to the load, wherein, the load can be three-phase motor.
In any of the above technical solutions, the method further includes: the rectifier circuit is configured to output a direct current power supply signal, an input end of the rectifier circuit is configured to receive an alternating current power supply signal, and an output end of the rectifier circuit is connected with the bus line.
In the technical scheme, the control circuit further comprises a rectifying circuit, wherein the rectifying circuit rectifies the alternating current power supply signal after receiving the alternating current power supply signal, and outputs the direct current power supply signal through a bus line, so that the pre-charging circuit charges the capacitor according to the direct current power supply signal, and meanwhile, after the pre-charging circuit is charged, the direct current power supply signal can directly charge the capacitor, so that the capacitor supplies power to the load.
In a second aspect of the present invention, a control method of a control circuit is presented for controlling the control circuit according to any one of the above, wherein the control method of the control circuit comprises: and determining that the load demand information is larger than a specified value, and controlling the conduction of the first switching device so as to enable the pre-charging circuit to output the direct current power supply signal to the capacitor.
In the control method of the control circuit provided by the invention, when the load demand information is detected to be larger than a specified value, the conduction of the first switch device is controlled, at the moment, the pre-charging circuit pre-charges the capacitor, so that the control circuit supplies power to the load and outputs power corresponding to the load demand information, wherein the designated value is zero, namely, when the load output power is judged to be needed, the pre-charging circuit is controlled to charge the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charging circuit and the circuit where the capacitor is located when the load output power is not needed, further, the temperature in the electric control cavity is increased due to the heat dissipated by the capacitor, the working stability of the frequency conversion main loop is affected, and the frequency conversion main loop forms a loop when being electrified, when other equipment of the frequency conversion main loop is switched or surges are generated in a power grid, the conditions of damage to components of the frequency conversion main loop and the like can be caused.
In addition, the control method of the control 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 method further comprises: and determining that the bus voltage is greater than or equal to the voltage threshold value, and controlling the second switching device to be conducted.
In the technical scheme, the conducting state of the second switching device is controlled by detecting the size relation between the bus voltage and the voltage threshold, specifically, when the bus voltage is determined to be greater than or equal to the voltage threshold, the second switching device is controlled to be conducted to finish the charging of the capacitor by the pre-charging circuit, the damage of the circuit where the capacitor is located due to overcurrent caused by the fact that the time for charging the capacitor by the pre-charging circuit is too short is avoided, and the reliability of the control circuit is effectively improved through the scheme of the application.
In any of the above technical solutions, the method further includes: and determining that the load demand information is less than or equal to a specified value, controlling the second switching device to be switched off, and controlling the first switching device to be switched off so as to stop the direct current power supply signal output to the capacitor by the pre-charging circuit.
In the technical scheme, when it is determined that the load demand information is less than or equal to a specified value, wherein the specified value is zero, that is, it is determined that there is no load demand currently, at this time, the first switching device is controlled to be turned off, so as to control the pre-charging circuit to stop charging the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charging circuit and the circuit where the capacitor is located when the load output power is not needed, and further, the temperature in the electric control cavity is increased due to heat dissipated by the capacitor, which affects the working stability of the frequency conversion main loop, and the frequency conversion main loop can form a loop when being powered on, and when other devices in the frequency conversion main loop are switched or surge is generated in a power grid, the situations such as component damage of the frequency conversion main loop can be caused.
Meanwhile, before the first switching device is controlled, the second switching device is controlled to be cut off, the current in the loop of the capacitor is controlled by the first resistor arranged in the pre-charging circuit, the risk that all components in the control circuit are damaged due to overcurrent is reduced, and the conditions that the components of the frequency conversion main loop are damaged when other equipment of the frequency conversion main loop is switched or surges are generated in a power grid are avoided, so that the reliability of circuit control is improved.
In any of the above technical solutions, the load demand information includes one or more of the following: starting signals of the compressor and the fan.
In the technical scheme, the starting signal of the compressor is set to be 1500 rpm and 5000 rpm, and the starting signal of the fan is set to be 1500 rpm and 5000 rpm similarly.
In a third aspect of the present invention, a control device of a control 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 the steps of the control method of the control circuit as in any one of the above.
Specifically, the controller executes a computer program stored in the memory to perform the step of controlling the conduction of the first switching device to cause the precharge circuit to output the dc supply signal to the capacitor if it is determined that the load demand information is greater than the specified value.
The invention provides a control device of a control circuit, a controller executes a computer program stored in a memory to realize that when load demand information is detected to be larger than a specified value, the conduction of a first switch device is controlled, at the moment, a pre-charging circuit pre-charges a capacitor so that the control circuit supplies power to the load and outputs power corresponding to the load demand information, wherein the specified value is zero, namely when the load output power is judged to be needed, the pre-charging circuit is controlled to charge the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charging circuit and a circuit where the capacitor is positioned when the load output power is not needed, further avoiding the temperature rise in an electric control cavity caused by heat dissipated by the capacitor and influencing the working stability of a frequency conversion main loop, and forming a loop when the frequency conversion main loop is electrified and generating surge in the switching of other equipment of the frequency conversion main loop or in an electric network, the component damage of the frequency conversion main loop and other conditions can be caused.
In addition, the control device of the control 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 is further configured to execute a computer program stored in the memory to implement the step of controlling the second switching device to be turned on, for example, when it is determined that the bus voltage is greater than or equal to the voltage threshold.
In the technical scheme, the conducting state of the second switching device is controlled by detecting the size relation between the bus voltage and the voltage threshold, specifically, when the bus voltage is determined to be greater than or equal to the voltage threshold, the second switching device is controlled to be conducted to finish the charging of the capacitor by the pre-charging circuit, the damage of the circuit where the capacitor is located due to overcurrent caused by the fact that the time for charging the capacitor by the pre-charging circuit is too short is avoided, and the reliability of the control circuit is effectively improved through the scheme of the application.
In any of the above solutions, the controller is further configured to execute a computer program stored in the memory to implement the steps of determining that the load demand information is less than or equal to a specified value, controlling the second switching device to be turned off, and controlling the first switching device to be turned off to stop the dc power supply signal output from the precharge circuit to the capacitor.
In the technical scheme, when it is determined that the load demand information is less than or equal to a specified value, wherein the specified value is zero, that is, it is determined that there is no load demand currently, at this time, the first switching device is controlled to be turned off, so as to control the pre-charging circuit to stop charging the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charging circuit and the circuit where the capacitor is located when the load output power is not needed, and further, the temperature in the electric control cavity is increased due to heat dissipated by the capacitor, which affects the working stability of the frequency conversion main loop, and the frequency conversion main loop can form a loop when being powered on, and when other devices in the frequency conversion main loop are switched or surge is generated in a power grid, the situations such as component damage of the frequency conversion main loop can be caused.
Meanwhile, before the first switching device is controlled, the second switching device is controlled to be cut off, the current in the loop of the capacitor is controlled by the first resistor arranged in the pre-charging circuit, the risk that all components in the control circuit are damaged due to overcurrent is reduced, and the conditions that the components of the frequency conversion main loop are damaged when other equipment of the frequency conversion main loop is switched or surges are generated in a power grid are avoided, so that the reliability of circuit control is improved.
In any of the above technical solutions, the load demand information includes one or more of the following: starting signals of the compressor and the fan.
In the technical scheme, the starting signal of the compressor is set to be 1500 rpm and 5000 rpm, and the starting signal of the fan is set to be 1500 rpm and 5000 rpm similarly.
In a fourth aspect of the present invention, an air conditioner is provided, which includes any one of the control circuits described above and/or the control device of the control circuit described above.
The air conditioner provided by the invention comprises any one of the control circuits and/or the control device of the control circuit, so that the air conditioner has all the beneficial technical effects of any one of the control circuits and/or the control device of the control circuit, and the description is omitted.
In the above technical solution, the air conditioner includes an indoor unit, and the load demand information includes: and starting up signals of the indoor unit.
In the technical scheme, under a normal condition, when a refrigeration demand, a heating demand or a ventilation demand exists, a user can start the air conditioner, so that when a starting signal of the indoor unit is detected, the load demand information is judged to exist, and then the air conditioner executes the control logic of the application.
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 control circuit according to one embodiment of the present invention;
fig. 2 is a flow chart showing a flow executed by the control apparatus according to an embodiment of the present invention;
FIG. 3 shows a flow diagram of a control method of the control circuit according to one embodiment of the invention;
FIG. 4 shows a flow diagram of a control method of a control circuit according to another embodiment of the invention;
FIG. 5 shows a flow diagram of a method of controlling a refrigeration system according to yet another embodiment of the present invention;
fig. 6 shows a schematic block diagram of a control arrangement of the control circuit according to an embodiment of the invention.
Wherein, the corresponding relationship between the reference numbers and the component names in fig. 1 is:
the circuit comprises a control circuit 100, a capacitor 102, a precharge circuit 104, a first switching device 106, a control device 108, an inverter circuit 110, a rectifying circuit 112, a second switching device 114, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor E1 and a second capacitor E2.
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, the control circuit 100 includes a capacitor 102, the capacitor 102 being configured to supply power to a load; a precharge circuit 104, the precharge circuit 104 being configured to charge the capacitor 102, a first end of the precharge circuit 104 being connected to the bus line, a second end of the precharge circuit 104 being connected to the capacitor 102; a first switching device 106, wherein the first switching device 106 is connected in series between the first end of the pre-charge circuit 104 and the bus line or between the second end of the pre-charge circuit 104 and the capacitor 102; and a control device 108, wherein the control device 108 is connected to the control terminal of the first switching device 106, and the control device 108 is configured to control the conducting state of the first switching device 106 according to the load demand information.
The control circuit 100 of the present invention, wherein the pre-charge circuit 104 is configured to charge the capacitor 102, and the pre-charge circuit 104 is arranged to effectively limit the magnitude of the current flowing through the capacitor 102, so as to protect the safety of other devices in the circuit where the capacitor 102 is located, and reduce the occurrence of situations such as over-current burning, and the like, in the embodiments of the present invention, the first switching device 106 is arranged between the first end of the pre-charge circuit 104 and the bus line or between the second end of the pre-charge circuit 104 and the capacitor 102, and the pre-charge circuit 104 is controlled to switch off the capacitor 102 according to the load requirement information, specifically, when there is no load requirement, the first switching device 106 is controlled to switch off, that is, the pre-charge circuit 104 stops charging the capacitor 102, so that the circuit where the capacitor 102 is located cannot be powered on, it can be understood that the circuit where the capacitor 102 is located has no power consumption, and therefore, disadvantages existing in the present stage can be eliminated, meanwhile, the service life of each component in the circuit where the capacitor 102 is located is prolonged.
In one embodiment, the bus circuit includes a first dc bus and a second dc bus, wherein a first end of the pre-charge circuit 104 is connected to the first dc bus, a second end of the pre-charge circuit is connected to a first end of the capacitor 102, a second end of the capacitor 102 is connected to the second dc bus to form a loop, and the first switching device 106 is connected in series between the first end of the pre-charge circuit 104 and the first dc bus or between the second end of the pre-charge circuit 104 and the first end of the capacitor 102.
The first direct current bus is a high-voltage bus, and the second direct current bus is a low-voltage bus.
In one embodiment, the precharge circuit 104 includes: a first resistor R1, the first resistor R1 configured to limit current flowing through the capacitor 102.
In this embodiment, the precharge circuit 104 is provided with the first resistor R1, wherein the first resistor R1 can limit the amount of current flowing through the precharge circuit 104 to charge the capacitor 102, and further ensure that each component in the circuit where the precharge circuit 104 and the capacitor 102 are located is not damaged by an overcurrent when the capacitor 102 is charged, thereby improving the reliability of the control circuit 100.
In an embodiment of the invention, the capacitor 102 includes a first capacitor E1 and a second capacitor E2 connected in series, specifically, a first end of the first capacitor E1 is connected to a first dc bus, a second end of the first capacitor E1 is connected to a first end of the second capacitor E2, a second end of the second capacitor E2 is connected to a second dc bus, the control circuit 100 further includes a second resistor R2 and a third resistor, wherein the first end of the second resistor R2 is connected to the first end of the first capacitor E1, the second end of the second resistor R2 is connected to the first end of the third resistor and then connected to the second end of the first capacitor E1, and the second end of the third resistor is connected to the second dc bus, wherein the second resistor R2 and the third resistor are voltage sharing resistors, so as to ensure that the first capacitor E1 and the second capacitor E2 output stable voltage to the load.
In one embodiment, the control circuit 100 further includes: the inverter circuit 110 is disposed between the capacitor 102 and the load, an input end of the inverter circuit 110 is connected to the capacitor 102, and an output end of the inverter circuit 110 is connected to the load.
In this embodiment, the control circuit 100 further includes an inverter circuit 110, wherein the inverter circuit 110 is disposed between the capacitor 102 and a load to supply power to the load, wherein the load may be a three-phase motor.
Specifically, a first terminal of the first capacitor E1 is connected to a first input terminal of the inverter circuit 110, and a second terminal of the second capacitor E2 is connected to a second input terminal of the inverter circuit 110, wherein the inverter circuit 110 includes a plurality of power switches.
In one embodiment, the control circuit 100 further includes: a rectifying circuit 112, the rectifying circuit 112 configured to output a dc power supply signal, an input terminal of the rectifying circuit 112 configured to receive an ac power supply signal, and an output terminal of the rectifying circuit 112 connected to the bus line.
In this embodiment, the control circuit 100 further includes a rectifying circuit 112, wherein the rectifying circuit 112 rectifies the ac power supply signal after receiving the ac power supply signal, and outputs the dc power supply signal through the bus line, so that the pre-charging circuit 104 charges the capacitor 102 according to the dc power supply signal, and meanwhile, after the pre-charging circuit 104 is charged, the dc power supply signal may directly charge the capacitor 102, so that the capacitor 102 supplies power to the load.
Specifically, the rectifier circuit 112 is constituted by a bridge circuit (or bridge stack) constituted by using diodes.
In one embodiment thereof, the first switching device 106 is an electromagnetic relay.
Example two
In the above embodiment, the control circuit 100 further includes: a second switching device 114, a first terminal of the second switching device 114 is connected to the bus line, and a second terminal of the second switching device 114 is connected to the capacitor 102; the control means 108 are also adapted to: the conductive state of the second switching device 114 is controlled according to the comparison of the bus voltage with the voltage threshold.
In this embodiment, the control circuit 100 further includes a second switching device 114, wherein a first end of the second switching device 114 is connected to the bus line, and a second end of the second switching device 114 is connected to the capacitor 102, that is, the series connection of the pre-charge circuit 104 and the first switching device 106 forms a parallel connection relationship with the second switching device 114, and whether the pre-charge circuit 104 finishes charging the capacitor 102 can be controlled according to a conducting state of the second switching device 114, and specifically, the control device 108 is further configured to: the conducting state of the second switching device 114 is controlled according to the comparison result of the bus voltage and the voltage threshold, that is, whether to finish the pre-charging is determined according to the comparison result of the bus voltage and the voltage threshold, so as to reduce the risk that each component in the circuit where the capacitor 102 is located is damaged due to overcurrent, wherein the bus voltage is a voltage value between the first direct current bus and the second direct current bus.
In one embodiment thereof, the second switching device 114 is an electromagnetic relay.
EXAMPLE III
In any of the above embodiments, taking an air conditioner including an indoor unit and an outdoor unit as an example, the control circuit is disposed in the outdoor unit, and a controller is disposed in the indoor unit, wherein the controller is in communication with the control device, and when the indoor unit and the outdoor unit are powered by a driving power supply, as shown in fig. 1 and fig. 2, the control device 108 disposed in the outdoor unit specifically performs the following steps:
s202, judging whether the starting-up requirement is zero, if so, executing S204, and if not, executing S210;
s204, the first switching device is cut off;
s206, the second switching device is cut off;
s208, disconnecting the driving power supply;
s210, conducting a first switching device;
s212, judging that the bus voltage Vdc reaches a voltage threshold value, if the judgment result is yes, executing S214, and if the judgment result is no, executing S210;
s214, the second switching device is conducted;
and S216, normally supplying power to the driving power supply.
In this embodiment, the pre-charge circuit 104 operates when the first switch device 106 is turned on, the power supply pre-charges the first capacitor E1 and the second capacitor E2, and the second switch device 114 is turned on when the pre-charge voltage (bus voltage Vdc) reaches a voltage threshold, so that the second switch device 114 has a smaller current after being turned on.
After the indoor unit and the outdoor unit are powered on, when the indoor unit does not have a starting signal, the outdoor unit controls the first switching device 106 and the second switching device 114 to be turned off, at this time, the inverter circuit 110, the first capacitor E1 and the second capacitor E2 do not have voltage, so that power consumption and heating are not generated, and meanwhile, a circuit where the capacitors are located does not form a loop, so that the influence of standby surge is effectively suppressed.
When the internal unit has a power-on signal, the external unit receives the command and transmits the command to the control device 108 (such as a compressor variable frequency driving module) to control the first switching device 106 to be switched on, the power supply charges the rear stage through the first switching device 106 and the first resistor R1, when the bus voltage Vdc reaches a voltage threshold value, the second switching device 114 is switched on, and the control circuit supplies power to the load through the inverter circuit 110.
When the load demand signal of the outdoor unit becomes zero and the load is controlled to stop working, the second switching device 114 and the first switching device 106 are sequentially controlled to be turned off.
In the above embodiment, when the air conditioning equipment is in a standby state, the power supply at the rear stage of the rectification circuit 112 is cut off, so that the capacitor 102 and the inverter circuit 110 are not electrified in the standby process, the problems of standby power consumption of the control circuit and temperature rise of the electric control cavity caused by heating of the device are solved, meanwhile, the control circuit does not form a loop, the introduction of a surge signal can be effectively avoided, and the service life and the reliability of a power device of the inverter circuit 110 are ensured.
Example four
In one embodiment of the present invention, as shown in fig. 3, a control method of a control circuit includes:
and S302, determining that the load demand information is larger than a specified value, and controlling the conduction of the first switching device so as to enable the pre-charging circuit to output the direct current power supply signal to the capacitor.
In the control method of the control circuit provided by the invention, when the load demand information is detected to be larger than a specified value, the conduction of the first switch device is controlled, at the moment, the pre-charging circuit pre-charges the capacitor, so that the control circuit supplies power to the load and outputs power corresponding to the load demand information, wherein the designated value is zero, namely, when the load output power is judged to be needed, the pre-charging circuit is controlled to charge the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charging circuit and the circuit where the capacitor is located when the load output power is not needed, further, the temperature in the electric control cavity is increased due to the heat dissipated by the capacitor, the working stability of the frequency conversion main loop is affected, and the frequency conversion main loop forms a loop when being electrified, when other equipment of the frequency conversion main loop is switched or surges are generated in a power grid, the conditions of damage to components of the frequency conversion main loop and the like can be caused.
In one embodiment of the present invention, as shown in fig. 4, a control method of a control circuit includes:
s402, determining that the load demand information is larger than a specified value, and controlling the conduction of a first switching device to enable a pre-charging circuit to output a direct current power supply signal to a capacitor;
and S404, determining that the bus voltage is greater than or equal to the voltage threshold, and controlling the second switching device to be conducted.
In this embodiment, the conducting state of the second switching device is controlled by detecting the relationship between the bus voltage and the voltage threshold, specifically, when it is determined that the bus voltage is greater than or equal to the voltage threshold, the second switching device is controlled to be conducting to end the charging of the capacitor by the pre-charging circuit, so that the damage of the circuit where the capacitor is located due to overcurrent caused by the excessively short time for the pre-charging circuit to charge the capacitor is avoided, and the reliability of the control circuit is effectively improved by the above scheme of the present application.
In one embodiment of the present invention, as shown in fig. 5, a control method of a control circuit includes:
s502, determining that the load demand information is larger than a specified value, and controlling the conduction of a first switching device so as to enable a pre-charging circuit to output a direct current power supply signal to a capacitor;
s504, determining that the bus voltage is greater than or equal to a voltage threshold value, and controlling the second switching device to be conducted;
and S506, determining that the load demand information is smaller than or equal to a specified value, controlling the second switching device to be switched off, and controlling the first switching device to be switched off so as to stop the direct current power supply signal output by the pre-charging circuit to the capacitor.
In this embodiment, when it is determined that the load demand information is less than or equal to a specified value, where the specified value is zero, that is, it is determined that there is no load demand currently, at this time, the first switching device is controlled to be turned off to control the pre-charge circuit to stop charging the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charge circuit and the circuit where the capacitor is located when no load output power is needed, and further, the temperature in the electric control cavity is increased due to heat dissipated by the capacitor, which affects the stability of the operation of the frequency conversion main loop, and the frequency conversion main loop forms a loop when being powered on, and when switching other devices of the frequency conversion main loop or generating a surge in the power grid, the situations such as component damage of the frequency conversion main loop occur.
Meanwhile, before the first switching device is controlled, the second switching device is controlled to be cut off, the current in the loop of the capacitor is controlled by the first resistor arranged in the pre-charging circuit, the risk that all components in the control circuit are damaged due to overcurrent is reduced, and the conditions that the components of the frequency conversion main loop are damaged when other equipment of the frequency conversion main loop is switched or surges are generated in a power grid are avoided, so that the reliability of circuit control is improved.
In one embodiment, the load demand information includes one or more of: starting signals of the compressor and the fan.
In this embodiment, the compressor start signal is set to 1500 rpm, or 5000 rpm, and similarly, the fan start signal is set to 1500 rpm, or 5000 rpm.
EXAMPLE five
In one embodiment of the present invention, as shown in fig. 6, a control device 600 of a control circuit is proposed, comprising: a controller 602; a memory 604 for storing a computer program; the controller 602 executes a computer program stored in the memory 604 to implement the steps of the control method of the control circuit as in any one of the above.
Specifically, the controller 602 executes a computer program stored in the memory 604 to implement the steps of controlling the conduction of the first switching device to cause the precharge circuit to output the dc supply signal to the capacitor if it is determined that the load demand information is greater than the specified value.
In the control device 600 of the control circuit according to the present invention, the controller 602 executes a computer program stored in the memory 604 to control the conduction of the first switching device when detecting that the load demand information is greater than a specified value, and at this time, the pre-charging circuit pre-charges the capacitor so that the control circuit supplies power to the load and outputs power corresponding to the load demand information, wherein the specified value is zero, that is, when it is determined that the load output power is required, the pre-charging circuit is controlled to charge the capacitor, thereby effectively avoiding unnecessary power consumption of the pre-charging circuit and the circuit where the capacitor is located when the load output power is not required, further avoiding the temperature rise in the electric control cavity caused by the heat dissipated by the capacitor, which affects the stability of the operation of the frequency conversion main circuit, and when the frequency conversion main circuit is powered on, a circuit is formed, and when other devices of the frequency conversion main circuit are switched or a surge is generated in the power grid, the component damage of the frequency conversion main loop and other conditions can be caused.
In one embodiment, the controller 602 is further configured to execute a computer program stored in the memory 604 to perform the step of controlling the second switching device to conduct, for example, if the bus voltage is determined to be greater than or equal to the voltage threshold.
In this embodiment, the conducting state of the second switching device is controlled by detecting the relationship between the bus voltage and the voltage threshold, specifically, when it is determined that the bus voltage is greater than or equal to the voltage threshold, the second switching device is controlled to be conducting to end the charging of the capacitor by the pre-charging circuit, so that the damage of the circuit where the capacitor is located due to overcurrent caused by the excessively short time for the pre-charging circuit to charge the capacitor is avoided, and the reliability of the control circuit is effectively improved by the above scheme of the present application.
In one embodiment, the controller 602 is further configured to execute a computer program stored in the memory 604 to perform the steps of determining that the load demand information is less than or equal to a specified value, controlling the second switching device to be turned off, and controlling the first switching device to be turned off to stop the dc power supply signal output by the pre-charge circuit to the capacitor.
In this embodiment, when it is determined that the load demand information is less than or equal to a specified value, where the specified value is zero, that is, it is determined that there is no load demand currently, at this time, the first switching device is controlled to be turned off to control the pre-charge circuit to stop charging the capacitor, thereby effectively avoiding unnecessary power consumption generated by the pre-charge circuit and the circuit where the capacitor is located when no load output power is needed, and further, the temperature in the electric control cavity is increased due to heat dissipated by the capacitor, which affects the stability of the operation of the frequency conversion main loop, and the frequency conversion main loop forms a loop when being powered on, and when switching other devices of the frequency conversion main loop or generating a surge in the power grid, the situations such as component damage of the frequency conversion main loop occur.
Meanwhile, before the first switching device is controlled, the second switching device is controlled to be cut off, the current in the loop of the capacitor is controlled by the first resistor arranged in the pre-charging circuit, the risk that all components in the control circuit are damaged due to overcurrent is reduced, and the conditions that the components of the frequency conversion main loop are damaged when other equipment of the frequency conversion main loop is switched or surges are generated in a power grid are avoided, so that the reliability of circuit control is improved.
In one embodiment, the load demand information includes one or more of: starting signals of the compressor and the fan.
In this embodiment, the compressor start signal is set to 1500 rpm, or 5000 rpm, and similarly, the fan start signal is set to 1500 rpm, or 5000 rpm.
EXAMPLE six
In an embodiment of the present invention, an air conditioner is provided, which includes any one of the control circuits described above and/or the control device of the control circuit described above.
The air conditioner provided by the invention comprises any one of the control circuits and/or the control device of the control circuit, so that the air conditioner has all the beneficial technical effects of any one of the control circuits and/or the control device of the control circuit, and the description is omitted.
In the above embodiment, the air conditioner includes an indoor unit, and the load demand information includes: and starting up signals of the indoor unit.
In this embodiment, in a normal case, when there is a cooling demand, a heating demand, or a ventilation demand, a user may turn on the air conditioner, and therefore, when a start signal of the indoor unit is detected, it is determined that there is load demand information, and the air conditioner executes the control logic of the present application.
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 (10)
1. A control circuit, comprising:
a capacitance configured to supply power to a load;
a pre-charge circuit configured to charge the capacitor, a first end of the pre-charge circuit being connected to a bus line, a second end of the pre-charge circuit being connected to the capacitor;
the first switching device is connected between the first end of the pre-charging circuit and a bus line or between the second end of the pre-charging circuit and the capacitor in series;
a control device connected to a control terminal of the first switching device, the control device configured to control a conduction state of the first switching device according to load demand information;
determining that the load demand information is larger than a specified value, and controlling the conduction of a first switching device so as to enable the pre-charging circuit to output a direct current power supply signal to the capacitor;
wherein the specified value is zero;
the bus line comprises a first direct current bus and a second direct current bus, wherein the first end of the pre-charging circuit is connected with the first direct current bus, the second end of the pre-charging circuit is connected with the first end of the capacitor, and the second end of the capacitor is connected with the second direct current bus;
the capacitor comprises a first capacitor and a second capacitor which are connected in series, wherein a first end of the first capacitor is connected with the first direct current bus, a second end of the first capacitor is connected with a first end of the second capacitor, and a second end of the second capacitor is connected with the second direct current bus;
the first end of the second resistor is connected with the first end of the first capacitor, the second end of the second resistor is connected with the first end of the third resistor and then connected with the second end of the first capacitor, the second end of the third resistor is connected with the second direct current bus, and the second resistor and the third resistor are voltage-sharing resistors;
the control circuit further includes:
a rectifying circuit configured to output a direct current supply signal, an input end of the rectifying circuit configured to receive an alternating current supply signal, and an output end of the rectifying circuit connected to the bus line;
when a starting signal of the indoor unit is detected, the load demand information is determined to exist, and the load demand information comprises one or more of the following: starting signals of the compressor and the fan.
2. The control circuit of claim 1, wherein the pre-charge circuit comprises:
a first resistance configured to limit current flowing through the capacitance.
3. The control circuit according to claim 1 or 2, wherein the control circuit further comprises:
a second switching device, a first end of the second switching device being connected to the bus line, and a second end of the second switching device being connected to the capacitor;
the control device is further configured to:
and controlling the conduction state of the second switching device according to the comparison result of the bus voltage and the voltage threshold.
4. The control circuit of claim 1, further comprising:
the inverter circuit is arranged between the capacitor and the load, the input end of the inverter circuit is connected with the capacitor, and the output end of the inverter circuit is connected with the load.
5. A control method of a control circuit for the control circuit according to any one of claims 1 to 4, characterized by comprising:
determining that the load demand information is larger than a specified value, and controlling the conduction of a first switching device so as to enable the pre-charging circuit to output a direct current power supply signal to the capacitor;
the specified value is zero, and when a starting signal of the indoor unit is detected, the load demand information is determined to exist, and the load demand information comprises one or more of the following: starting signals of the compressor and the fan.
6. The control circuit of claim 5, further comprising:
and determining that the bus voltage is greater than or equal to the voltage threshold value, and controlling the second switching device to be conducted.
7. The control circuit of claim 6, further comprising:
and determining that the load demand information is less than or equal to the designated value, controlling the second switching device to be switched off, and controlling the first switching device to be switched off so as to stop the direct current power supply signal output to the capacitor by the pre-charging circuit.
8. A control device for a control 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 control circuit according to any one of claims 5 to 7.
9. An air conditioner, characterized in that the air conditioner comprises:
the control circuit of any one of claims 1 to 4; and/or
Control means for a control circuit as claimed in claim 8.
10. The air conditioner of claim 9, wherein the air conditioner comprises an indoor unit, and the load demand information comprises: and starting up signals of the indoor unit.
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| CN201911124932.6A CN110829817B (en) | 2019-11-18 | 2019-11-18 | Control circuit, control method and device of control circuit and air conditioner |
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