CN115085338A - Charging circuit, control method thereof, air conditioner and computer readable storage medium - Google Patents

Charging circuit, control method thereof, air conditioner and computer readable storage medium Download PDF

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Publication number
CN115085338A
CN115085338A CN202210927901.XA CN202210927901A CN115085338A CN 115085338 A CN115085338 A CN 115085338A CN 202210927901 A CN202210927901 A CN 202210927901A CN 115085338 A CN115085338 A CN 115085338A
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China
Prior art keywords
charging
preset
charging circuit
temperature
thermistor
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Pending
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CN202210927901.XA
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Chinese (zh)
Inventor
李佳秋
刘志辉
李洋
范晓坤
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202210927901.XA priority Critical patent/CN115085338A/en
Publication of CN115085338A publication Critical patent/CN115085338A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a charging circuit and a control method thereof, an air conditioner and a computer readable storage medium, wherein the control method comprises the following steps: establishing a relation curve of the resistance value and the temperature of a thermistor in a charging circuit; acquiring the resistance value of the thermistor at the current outdoor temperature according to the relation curve; calculating the charging time when the electric quantity of the equipment to be charged reaches the preset electric quantity at the outdoor temperature according to the resistance value of the thermistor and the electric parameters of the charging circuit; and adjusting the total resistance value of the charging circuit according to the comparison relation between the outdoor temperature and the preset temperature, and between the charging time and the preset charging time. The scheme provided by the invention comprehensively considers the comparison relation between the current outdoor temperature and the judgment temperature of the low-temperature working condition, the actual charging time of the equipment to be charged and the preset charging time set by the program, adjusts the total resistance value of the charging circuit when the resistance value change of the thermistor influences the charging reliability, and solves the influence of the resistance value change of the thermistor on the charging reliability under the low-temperature working condition.

Description

Charging circuit, control method thereof, air conditioner and computer readable storage medium
Technical Field
The present invention relates to the field of energy transmission, and in particular, to a charging circuit, a control method thereof, an air conditioner, and a computer-readable storage medium.
Background
Electrolytic capacitors are currently widely used in various fields. At present, there are two charging modes for the electrolytic capacitor, one is to use a charging circuit with a reasonable design of the PTC resistor for charging, and the other is to use a charging circuit with a reasonable design of the common current-limiting resistor for charging.
The PTC resistor is a positive temperature coefficient resistor, the resistance value of which is affected by the temperature of the resistor body, and when the temperature exceeds a certain temperature, the resistance value of which increases in a step-like manner along with the increase of the temperature. The resistance value is not directly proportional to its bulk temperature before the curie temperature.
As can be seen from fig. 1, the resistance of the PTC resistor decreases as the temperature increases under normal temperature conditions. Therefore, compared with a charging circuit using a common current limiting resistor, the charging circuit using the PTC resistor can reduce power consumption and shorten charging time when used in a normal temperature state. Meanwhile, in a charging circuit using a common current-limiting resistor, excessive circuit current and temperature rise are likely to occur, so that charging failure is caused. However, in the charging circuit using the PTC resistor, if the circuit current is too large and the temperature rises, the resistance value of the PTC resistor becomes larger and larger, and the PTC resistor can form an open circuit effect after the temperature reaches a certain point, so that the charging fault cannot be caused.
A charging circuit using a PTC resistor has been widely used because of the above-described advantages. However, as shown in fig. 1, according to the temperature curve of the resistor, the resistance value at a low temperature is larger than the resistance value at a normal temperature, and when the circuit operates, the PTC resistor under the low temperature condition will divide a larger voltage, and at this time, if the divided voltage reaches a voltage determination point set by a program, the charging time exceeds the charging time set by the program, so that the charging circuit is determined as a charging failure. Therefore, the outdoor unit of the air conditioner including the PTC resistor operates under a low temperature condition, so that it is necessary to solve the problem of the influence of the resistance change of the PTC resistor on the reliability of the charging of the bus capacitor and the continuity of the system operation.
Disclosure of Invention
The invention provides a charging circuit, a control method thereof, an air conditioner and a computer readable storage medium, aiming at solving the technical problem that the charging reliability is influenced by the resistance value change of a PTC resistor in the charging circuit under the low-temperature working condition in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a charging circuit and a control method thereof, an air conditioner and a computer readable storage medium, wherein the control method of the charging circuit comprises the following steps:
establishing a relation curve of the resistance value and the temperature of the thermistor in the charging circuit;
acquiring the resistance value of the thermistor at the current outdoor temperature according to the relation curve;
calculating the charging time when the electric quantity of the equipment to be charged reaches the preset electric quantity at the outdoor temperature according to the resistance value of the thermistor and the electric parameter of the charging circuit;
and adjusting the total resistance value of the charging circuit according to the comparison relation between the outdoor temperature and the preset temperature and between the charging time and the preset charging time.
Further, adjusting the total resistance of the charging circuit according to the comparison relationship between the outdoor temperature and the preset temperature and between the charging time and the preset charging time specifically comprises the steps of:
and when the outdoor temperature is greater than or equal to the preset temperature or the outdoor temperature is less than the preset temperature and the charging time is less than or equal to the preset charging time, keeping the total resistance value of the charging circuit unchanged and directly charging the equipment to be charged.
Further, adjusting the total resistance of the charging circuit according to the comparison relationship between the outdoor temperature and the preset temperature and between the charging time and the preset charging time specifically comprises the steps of:
when the outdoor temperature is lower than the preset temperature and the charging time is longer than the preset charging time, the external resistor reduces the total resistance value in the charging circuit and then charges the equipment to be charged.
Further, the method also comprises the following steps:
when the charging time of the equipment to be charged is greater than or equal to the preset charging time, judging whether the electric quantity of the equipment to be charged reaches the preset electric quantity;
if yes, adjusting the total resistance value of the charging circuit to be zero after the buffering time length is preset, and finishing charging;
if not, the charging fault is warned.
In one embodiment, the thermistor is a PTC resistor.
A charging circuit, a control method using the charging circuit described above.
Furthermore, the charging circuit comprises a power supply, equipment to be charged, a plurality of thermistors and a plurality of control switches for controlling the total resistance value of the thermistors connected into the charging circuit.
In an embodiment, the charging device comprises a first thermistor, a second thermistor, a first control switch, a second control switch and a third control switch, wherein the power supply, the first control switch, the first thermistor and the device to be charged are sequentially connected in series, the second control switch is connected in parallel to two ends of the first thermistor, and the third control switch is connected in parallel to two ends of the first thermistor after being connected in series with the second thermistor.
Further, when the outdoor temperature is greater than or equal to the preset temperature or the outdoor temperature is less than the preset temperature and the charging time is less than or equal to the preset charging time, the first control switch is closed, and the second control switch and the third control switch are opened.
Further, when the outdoor temperature is lower than the preset temperature and the charging time is longer than the preset charging time, the first control switch and the third control switch are closed, and the second control switch is opened.
Further, when the charging time of the device to be charged is greater than or equal to the preset charging time and the electric quantity of the device to be charged reaches the preset electric quantity, the second control switch is closed after the preset buffering time is reached.
The air conditioner comprises a bus capacitor and further charges the bus capacitor by using the charging circuit.
A computer-readable storage medium for storing a computer program which, when executed, performs the control method of the charging circuit described above.
Compared with the prior art, the scheme provided by the invention combines the comparison relationship between the current outdoor temperature and the judgment temperature of the low-temperature working condition, and the comparison relationship between the actual charging time of the equipment to be charged and the preset charging time set by the program for comprehensive consideration, thereby judging whether the resistance value change of the thermistor in the charging circuit influences the charging reliability. If the influence is generated, the total resistance value of the charging circuit is adjusted in time. The control method is thorough in consideration and easy to realize, and perfectly solves the problem that the resistance value change of the thermistor under the low-temperature working condition has influence on the charging reliability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.
FIG. 1 is a graph of resistance versus temperature for a thermistor;
FIG. 2 is a schematic diagram of a charging circuit according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method for a charging circuit according to an embodiment of the present invention;
fig. 4 is a timing chart of a charging circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Electrolytic capacitors are currently widely used in various fields. At present, there are two charging modes for the electrolytic capacitor, one is to use a charging circuit with a reasonable design of the PTC resistor for charging, and the other is to use a charging circuit with a reasonable design of the common current-limiting resistor for charging. Among them, a charging circuit using a PTC resistor is widely used because of its various advantages.
For example, as shown in fig. 1, the resistance of the PTC resistor decreases with increasing temperature under normal temperature conditions. Therefore, compared with a charging circuit using a common current limiting resistor, the charging circuit using the PTC resistor can reduce power consumption and shorten charging time when used in a normal temperature state. Meanwhile, in a charging circuit using a common current-limiting resistor, excessive circuit current and temperature rise are likely to occur, so that charging faults are caused. However, in the charging circuit using the PTC resistor, if the circuit current is too large and the temperature rises, the resistance value of the PTC resistor becomes larger and larger, and the PTC resistor can form an open circuit effect after the temperature reaches a certain point, so that the charging fault cannot be caused.
However, it is not negligible that, according to the temperature curve of the resistor, the resistance value at low temperature is larger than the resistance at normal temperature, and the PTC resistor at low temperature will divide a larger voltage at normal temperature during the operation of the circuit, and at this time, if the divided voltage reaches the programmed voltage determination point, and the charging time exceeds the programmed charging time, the charging circuit will be determined as a charging fault. Therefore, the outdoor unit of the air conditioner including the PTC resistor operates under a low temperature condition, so that it is necessary to solve the problem of the influence of the resistance change of the PTC resistor on the reliability of the charging of the bus capacitor and the continuity of the system operation.
Therefore, in order to solve the problem that the resistance value change of the PTC resistor in the charging circuit under the low-temperature working condition affects the charging reliability, the invention provides a control method of the charging circuit, which specifically comprises the following steps:
establishing a relation curve of the resistance value and the temperature of a thermistor in a charging circuit;
acquiring the resistance value corresponding to the thermistor at the current outdoor temperature according to the relation curve;
calculating the charging time when the electric quantity of the equipment to be charged reaches the preset electric quantity at the current outdoor temperature according to the corresponding resistance value of the thermistor and the electric parameter of the charging circuit;
and adjusting the total resistance value of the charging circuit according to the comparison relation between the current outdoor temperature and the preset temperature, and between the charging time and the preset charging time.
The preset temperature is represented as a judgment temperature of a low-temperature working condition, that is, when the current outdoor temperature is lower than the preset temperature, the charging circuit works under the low-temperature working condition, at the moment, it needs to be considered that the voltage division of a thermistor in the charging circuit is more due to the resistance value change, so that the divided voltage is too large, the actual charging time of the device to be charged is longer than the preset charging time set by a program, and the charging circuit is judged to be a charging fault; when the current outdoor temperature is greater than or equal to the preset temperature, the influence caused by the resistance change of the thermistor in the charging circuit does not need to be considered, because it can be seen from fig. 1 that the resistance change of the thermistor under the normal-temperature working condition is small, and the change of the voltage division caused by the resistance change does not enable the actual charging time to exceed the preset charging time.
Therefore, it is only insufficient to determine whether the current outdoor temperature is in the low-temperature working condition, and it is also necessary to determine whether the change in the resistance value of the thermistor at the current outdoor temperature will cause the actual charging time of the device to be charged to exceed the preset charging time set by the program, where the charging time calculated in the control method when the device to be charged reaches the preset electric quantity at the current outdoor temperature is the actual charging time of the device to be charged, and the preset charging time is the preset charging time set by the program. The resistance value change of the thermistor can be accurately judged whether the charging reliability is influenced or not by combining the thermistor and the charging voltage, if so, the total resistance value of the charging circuit needs to be adjusted in time, and if not, the charging device to be charged is directly charged without adjusting the total resistance value of the charging circuit.
In summary, the scheme provided by the invention combines the comparison relationship between the current outdoor temperature and the judgment temperature of the low-temperature working condition, and the comparison relationship between the actual charging time of the device to be charged and the preset charging time set by the program for comprehensive consideration, so as to judge whether the resistance value change of the thermistor in the charging circuit influences the charging reliability. If the influence is generated, the total resistance value of the charging circuit is adjusted in time. The control method is thorough in consideration and easy to realize, and perfectly solves the problem of influence of resistance change of the thermistor under the low-temperature working condition on charging reliability.
Furthermore, if the current outdoor temperature is greater than or equal to the preset temperature, the total resistance value of the charging circuit is kept unchanged, and the equipment to be charged is directly charged. Or when the current outdoor temperature is lower than the preset temperature and the charging time is less than or equal to the preset charging time, the total resistance value of the charging circuit is kept unchanged, and the charging is directly carried out on the equipment to be charged. This means that the change in the resistance of the thermistor under low temperature conditions does not affect the reliability of charging, and the charging circuit does not need to be adjusted, and the charging device to be charged can be directly charged.
Further, if the current outdoor temperature is lower than the preset temperature and the charging time is longer than the preset charging time, the external resistor reduces the total resistance of the charging circuit and then charges the device to be charged. This indicates that the change in the resistance of the thermistor under low temperature conditions affects the charging reliability, resulting in the actual charging duration of the device to be charged at the current room temperature exceeding the preset charging duration set by the program. Therefore, the external resistor is needed to reduce the total resistance of the charging circuit, and the actual charging time of the device to be charged is shortened to be not more than the preset charging time set by the program.
Further, after the charging circuit starts to charge the device to be charged, whether the electric quantity of the device to be charged reaches the preset electric quantity is judged when the charging time of the device to be charged is equal to or longer than the preset charging time; if so, adjusting the total resistance value of the charging circuit to be zero after the preset buffering time length, and finishing charging; if not, alarming the charging fault of the charging circuit, and adjusting the total resistance value of the charging circuit to zero after the preset buffering time so as to enable the capacitor voltage to be more stable.
In one embodiment, the external thermistor is also a thermistor, and the external thermistor and the original thermistor in the charging circuit are PTC resistors.
In addition, the invention also provides a charging circuit which uses the control method of the charging circuit.
Furthermore, the charging circuit comprises a power supply, equipment to be charged, a plurality of thermistors and a plurality of control switches for controlling the total resistance value of the thermistors connected into the charging circuit.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 2, in this embodiment, an ac power supply supplies power to a device to be charged, a rectifier bridge is connected to the ac power supply, a fuse is connected between the rectifier bridge and the ac power supply, the rectifier bridge converts ac power into dc power to supply to the device to be charged, and the fuse plays a role in protecting from overcurrent and fusing. The output end of the rectifier bridge is connected with a first control switch K1, the other end of the first control switch K1 is connected with a first thermistor R1, the two ends of the first thermistor R1 are connected with a second control switch K2 in parallel, and a third control switch K3 and a second thermistor R2 are connected with the two ends of the first thermistor R1 in parallel after being connected in series. The equipment to be charged is connected between the other end of the first thermistor R1 and the input end of the rectifier bridge, and the equipment to be charged is specifically a bus capacitor C1 and a bus capacitor C2 which are arranged in parallel. The two ends of the bus capacitor C1 are connected with the IPM module, and the IPM module converts direct current into alternating current to be supplied to a load. In order to correct the power factor, a PFC module is connected in parallel to both ends of the bus capacitor C1.
The specific charging circuit shown in fig. 2 illustrates the specific steps and the operation principle of the control method of the charging circuit proposed by the present invention.
First, the first thermistor R1 is connected in the initial state of the charging circuit, the second thermistor R2 is an externally connected resistor, and whether or not the charging circuit is connected is controlled by the third control switch K3. The relationship between the resistance and temperature of the first thermistor R1 is established prior to charging the bus capacitor C1 and the bus capacitor C2.
Then, the current outdoor temperature T is obtained, and whether the current outdoor temperature T is smaller than the preset temperature T or not is judged 0 ；
If not, the charging circuit does not work under the low-temperature working condition, only the first control switch K1 needs to be directly controlled to be closed, the first thermistor R1 is connected into the charging circuit, and the charging circuit charges the bus capacitor C1 and the bus capacitor C2.
If yes, the charging circuit works under the low-temperature working condition at the moment, and the charging reliability is influenced. Therefore, it is determined whether the actual charging time of the bus capacitor C1 and the bus capacitor C2 exceeds the preset charging time set by the program due to the resistance change of the corresponding first thermistor R1 at the current outdoor temperature. Specifically, the resistance value corresponding to the first thermistor R1 at the current outdoor temperature is obtained according to the established relationship curve, and then the charging time t required for charging the voltages of the bus capacitor C1 and the bus capacitor C2 to the V1 is calculated according to the capacitance value electrical parameters of the total voltage, the total resistance, the bus capacitor C1 and the bus capacitor C2 of the charging circuit cg . Then charging time t cg And programmed with a preset charging time t 0 A comparison is made. When charging time t cg Less than or equal to the preset charging time t 0 When the actual charging time of the equipment to be charged at the front temperature does not exceed the preset charging time set by the program, the first control switch K1 is only required to be directly controlled to be closed to charge the bus capacitor C1 and the bus capacitor C2. When charging time t cg Greater than the preset charging time t 0 When the charging is finished, the resistance value of the thermistor changes under the low-temperature working condition, so that the actual charging time of the device to be charged at the current room temperature exceeds the preset charging time set by the program, at this time, the third control switch K3 and the first control switch K1 need to be controlled to be closed at the same time, the second thermistor R2 is connected to the charging circuit, and therefore the charging time of the bus capacitor C1 and the bus capacitor C2 is reduced.
Waiting bus capacitor C1 and bus capacitor C2 the total charging time is greater than or equal to the preset charging time t 0 It is determined whether the voltages of the bus capacitor C1 and the bus capacitor C2 reach V1. That is, when the time at which the bus capacitor C1 and the bus capacitor C2 start charging is zero seconds as shown in fig. 3, the time t is t 0 And (4) judging whether the voltages of the bus capacitor C1 and the bus capacitor C2 reach V1 at the moment.
If so, controlling the second control switch K2 to be closed after the preset buffering time length to adjust the total resistance value in the charging circuit to 0, finishing charging the bus capacitor in the preset time set by the program in the charging circuit, and then directly supplying power to the bus capacitor and the load through a path formed by the first control switch K1 and the second control switch K2 by the alternating current power supply. That is, as shown in FIG. 3, at t 1 The second control switch K2 is closed at the moment, and the preset buffering time length is equal to t 1 Time t and 0 time difference between moments, t 1 After the moment, the first thermistor R1 and the second thermistor R2 are both short-circuited, the ac power supply directly supplies power to the bus capacitor C1 and the load through a path formed by the first control switch K1 and the second control switch K2, and the second control switch K2 is closed after a preset buffer duration is left in order to close the second control switch K2 when the capacitor voltage is more stable.
If not, directly closing the PWM signal of the IPM module to stop supplying power to the load, and alarming the charging circuit to have charging faults.
Furthermore, V1 is less than the rated voltage of the bus capacitor C1 and the bus capacitor C2, so that the charging time of the bus capacitor C1 and the bus capacitor C2 meets the preset charging time t 0 The reason that the rear voltage reaches V1 is to pre-charge the bus capacitor, which can reduce the impact current generated when the second control switch K2 is closed and the AC power supply directly supplies power to the bus capacitor C1, so that the current generated in the process that the AC power supply directly supplies power to the bus capacitor C1 through the first control switch K1 and the second control switch K2 can be ensured not to be larger than the peak current of the first control switch K1 and the second control switch K2, and the fuse and the rectifier bridge can also be protected.
Specifically, the first control switch K1, the second control switch K2, and the third control switch K3 are relays driven by a driver in the present embodiment. And V1 is 53% of the rated voltage of bus capacitor C1 in this embodiment. In other embodiments, the first control switch K1, the second control switch K2, and the third control switch K3 may also be other controllable switching devices such as MOS transistors, and the specific value of V1 is also not limited, and may be set according to actual needs. In addition, in this embodiment, whether the electric quantity of the device to be charged reaches the preset electric quantity is judged through the voltage, and in other embodiments, the electric quantity can be judged through the current.
In addition, the invention also provides an air conditioner, which comprises a bus capacitor arranged in an outdoor unit of the air conditioner, wherein the bus capacitor is charged by using the charging circuit. The main chip of the air conditioner stores the relation curve of the resistance value and the temperature of the thermistor in advance, and can also run the program corresponding to the control method of the charging circuit, and the outdoor unit of the air conditioner is provided with a temperature sensing bulb for detecting the outdoor temperature. Therefore, when the outdoor unit of the air conditioner starts to be powered on, the main chip receives the outdoor temperature detected by the temperature sensing bulb and executes the program corresponding to the control method of the charging circuit.
Furthermore, the present invention also proposes a computer storage medium for storing a computer program which, when running, executes the above proposed control method for a charging circuit.
It is noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (13)

1. A method of controlling a charging circuit, comprising the steps of:
establishing a relation curve of the resistance value and the temperature of the thermistor in the charging circuit;
acquiring the resistance value of the thermistor at the current outdoor temperature according to the relation curve;
calculating the charging time when the electric quantity of the equipment to be charged reaches the preset electric quantity at the outdoor temperature according to the resistance value of the thermistor and the electric parameter of the charging circuit;
and adjusting the total resistance value of the charging circuit according to the comparison relation between the outdoor temperature and the preset temperature and between the charging time and the preset charging time.
2. The method for controlling a charging circuit according to claim 1, wherein the step of adjusting the total resistance of the charging circuit according to the comparison relationship between the outdoor temperature and the preset temperature, and between the charging time and the preset charging time specifically comprises the steps of:
and when the outdoor temperature is greater than or equal to the preset temperature or the outdoor temperature is less than the preset temperature and the charging time is less than or equal to the preset charging time, keeping the total resistance value of the charging circuit unchanged and directly charging the equipment to be charged.
3. The method for controlling a charging circuit according to claim 1, wherein the step of adjusting the total resistance of the charging circuit according to the comparison relationship between the outdoor temperature and the preset temperature, and between the charging time and the preset charging time specifically comprises the steps of:
when the outdoor temperature is lower than the preset temperature and the charging time is longer than the preset charging time, the external resistor reduces the total resistance value in the charging circuit and then charges the equipment to be charged.
4. A control method of a charging circuit according to claim 2 or 3, characterized by further comprising the steps of:
when the charging time of the equipment to be charged is greater than or equal to the preset charging time, judging whether the electric quantity of the equipment to be charged reaches the preset electric quantity;
if yes, adjusting the total resistance value of the charging circuit to be zero after the buffering time length is preset, and finishing charging;
if not, the charging fault is warned.
5. The control method of a charging circuit according to claim 1, wherein the thermistor is a PTC resistor.
6. A charging circuit, characterized by using the control method of the charging circuit according to any one of claims 1 to 5.
7. The charging circuit of claim 6, comprising a power source, a device to be charged, a plurality of thermistors, and a plurality of control switches to control the total resistance of said thermistors incorporated into said charging circuit.
8. The charging circuit according to claim 7, comprising a first thermistor, a second thermistor, a first control switch, a second control switch and a third control switch, wherein the power source, the first control switch, the first thermistor and the device to be charged are connected in series in sequence, the second control switch is connected in parallel to both ends of the first thermistor, and the third control switch is connected in parallel to both ends of the first thermistor after being connected in series with the second thermistor.
9. The charging circuit according to claim 8, wherein when the outdoor temperature is greater than or equal to the preset temperature or the outdoor temperature is less than the preset temperature and the charging time is less than or equal to the preset charging time, the first control switch is closed, and the second control switch and the third control switch are opened.
10. The charging circuit according to claim 8, wherein when the outdoor temperature is less than the preset temperature and the charging time is greater than the preset charging time, the first control switch and the third control switch are closed and the second control switch is opened.
11. The charging circuit according to claim 9 or 10, wherein when the charging time period of the device to be charged is greater than or equal to a preset charging time and the electric quantity of the device to be charged reaches a preset electric quantity, the second control switch is closed after a preset buffer time period.
12. Air conditioner, including bus-bar capacitance, characterized in that, still use the charging circuit of any one of claims 6-11 to charge the bus-bar capacitance.
13. Computer-readable storage medium for storing a computer program, characterized in that the computer program is operative to perform a method of controlling a charging circuit according to any of claims 1-5.
CN202210927901.XA 2022-08-03 2022-08-03 Charging circuit, control method thereof, air conditioner and computer readable storage medium Pending CN115085338A (en)

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CN202210927901.XA CN115085338A (en) 2022-08-03 2022-08-03 Charging circuit, control method thereof, air conditioner and computer readable storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210927901.XA CN115085338A (en) 2022-08-03 2022-08-03 Charging circuit, control method thereof, air conditioner and computer readable storage medium

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Publication Number Publication Date
CN115085338A true CN115085338A (en) 2022-09-20

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CN (1) CN115085338A (en)

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