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

Abstract

The application discloses a charging circuit and a control method thereof, an air conditioner and a computer readable storage medium. The control method comprises the following steps: establishing a relationship curve between the resistance value of a thermistor in the charging circuit and the temperature; obtaining the resistance value of the thermistor at the current outdoor temperature according to the relationship curve; calculating the charging time of the equipment to be charged at the outdoor temperature to reach the preset electric quantity 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 relationship between the outdoor temperature and the preset temperature, the charging time and the preset charging time. The scheme provided by the application comprehensively considers the comparison relationship 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 affects the reliability of charging, and solves the influence of the resistance value change of the thermistor on the charging reliability under the low-temperature working condition.

Description

Technical Field

[0001] This invention relates to the field of energy transmission, and in particular to a charging circuit and its control method, an air conditioner, and a computer-readable storage medium. Background Technology

[0002] Currently, electrolytic capacitors are widely used in various fields. There are two charging methods for electrolytic capacitors: one is to use a PTC resistor in a reasonably designed charging circuit, and the other is to use a common current-limiting resistor in a reasonably designed charging circuit.

[0003] PTC resistors are positive temperature coefficient resistors, meaning their resistance is affected by the temperature of the resistor itself. Above a certain temperature, their resistance increases in a stepwise manner with increasing temperature. Before the Curie temperature, the resistance value is not directly proportional to the temperature of the resistor itself.

[0004] from Figure 1 As can be seen, under normal operating conditions, the resistance of the PTC resistor decreases as the temperature rises. Therefore, compared to charging circuits using ordinary current-limiting resistors, charging circuits using PTC resistors can reduce power consumption and shorten charging time when used at normal temperatures. Meanwhile, charging circuits using ordinary current-limiting resistors are highly susceptible to excessive current and temperature rise, leading to charging failures. However, in charging circuits using PTC resistors, if the circuit current is too high and the temperature rises, the resistance of the PTC resistor will also increase. When the temperature reaches a certain point, the PTC resistor will effectively open the circuit, preventing charging failures.

[0005] Because charging circuits using PTC resistors have the aforementioned advantages, they are widely used. However, it is important to note that... Figure 1 As shown, according to the temperature curve of the resistor, the resistance value is larger at low temperatures than at room temperature. During circuit operation, the PTC resistor at low temperatures will draw a larger voltage than the PTC resistor at room temperature. If this drawn voltage reaches the voltage threshold set by the program, the charging time will exceed the program's preset charging time, leading to a charging circuit malfunction. Therefore, air conditioner outdoor units containing PTC resistors, which operate under low-temperature conditions, need to address the impact of PTC resistor resistance changes on the reliability of bus capacitor charging and the continuity of system operation. Summary of the Invention

[0006] In order to solve the technical problem that the change in the resistance value of the PTC resistor in the charging circuit under low temperature conditions affects the charging reliability in the prior art, the present invention proposes a charging circuit and its control method, an air conditioner, and a computer-readable storage medium.

[0007] The technical solution adopted in this invention is:

[0008] This invention proposes a charging circuit and its control method, an air conditioner, and a computer-readable storage medium, wherein the control method of the charging circuit includes the following steps:

[0009] Establish the relationship curve between the resistance value and temperature of the thermistor in the charging circuit;

[0010] The resistance value of the thermistor at the current outdoor temperature is obtained based on the relationship curve.

[0011] The charging time required for the device to reach a preset charge level under outdoor temperature is calculated based on the resistance value of the thermistor and the electrical parameters of the charging circuit.

[0012] The total resistance of the charging circuit is adjusted based on the comparison between the outdoor temperature and the preset temperature, the charging time and the preset charging time.

[0013] Furthermore, adjusting the total resistance of the charging circuit based on the comparison between the outdoor temperature and the preset temperature, the charging time, and the preset charging time specifically includes the following steps:

[0014] When the outdoor temperature is greater than or equal to the preset temperature, or when the outdoor temperature is less than the preset temperature and the charging time is less than or equal to the preset charging time, the total resistance of the charging circuit remains unchanged and the device to be charged is charged directly.

[0015] Furthermore, adjusting the total resistance of the charging circuit based on the comparison between the outdoor temperature and the preset temperature, the charging time, and the preset charging time specifically includes the following steps:

[0016] 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 in the charging circuit before charging the device to be charged.

[0017] Furthermore, it also includes the following steps:

[0018] When the charging time of the device to be charged is greater than or equal to the preset charging time, it is determined whether the power of the device to be charged has reached the preset power.

[0019] If so, after a preset buffer time, adjust the total resistance of the charging circuit to zero, and charging is complete;

[0020] If not, an alarm will sound for a charging malfunction.

[0021] In one embodiment, the thermistor is a PTC resistor.

[0022] The charging circuit uses the control method described above.

[0023] Furthermore, the charging circuit includes a power supply, a device to be charged, multiple thermistors, and multiple control switches that control the total resistance of the thermistors connected in the charging circuit.

[0024] In one embodiment, the device includes a first thermistor, a second thermistor, a first control switch, a second control switch, and a third control switch. The power supply, the first control switch, the first thermistor, and the device to be charged are connected in series. The second control switch is connected in parallel across the first thermistor. The third control switch is connected in series with the second thermistor and then in parallel across the first thermistor.

[0025] Furthermore, when the outdoor temperature is greater than or equal to the preset temperature, or when 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 open.

[0026] Furthermore, when the outdoor temperature is lower 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.

[0027] Furthermore, when the charging time of the device to be charged is greater than or equal to the preset charging time and the power of the device to be charged reaches the preset power, the second control switch is closed after a preset buffer time.

[0028] The air conditioner includes a bus capacitor, and the bus capacitor is charged using the charging circuit described above.

[0029] A computer-readable storage medium for storing a computer program that, when executed, performs the control method of the charging circuit described above.

[0030] Compared with existing technologies, the solution proposed in this invention comprehensively considers the comparison between the current outdoor temperature and the judgment temperature under low-temperature conditions, as well as the comparison between the actual charging time of the device to be charged and the preset charging time set in the program, to determine whether the resistance change of the thermistor in the charging circuit affects the reliability of charging. If it does, the total resistance of the charging circuit is adjusted in a timely manner. This control method is comprehensive, easy to implement, and perfectly solves the problem of the impact of thermistor resistance change on charging reliability under low-temperature conditions. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a curve showing the relationship between the resistance of a thermistor and temperature.

[0033] Figure 2 This is a schematic diagram of the charging circuit in an embodiment of the present invention;

[0034] Figure 3 This is a flowchart illustrating the control method for the charging circuit proposed in this invention, as described in an embodiment of the invention.

[0035] Figure 4 This is a timing diagram of the control method for the charging circuit proposed in this invention, used in an embodiment of the invention. Detailed Implementation

[0036] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be 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 present invention and are not intended to limit the present invention.

[0037] Electrolytic capacitors are currently widely used in various fields. There are two main charging methods for electrolytic capacitors: one uses a properly designed charging circuit with a PTC resistor, and the other uses a properly designed charging circuit with a common current-limiting resistor. The charging circuit using a PTC resistor is more widely used due to its numerous advantages.

[0038] For example, from Figure 1 As can be seen, under normal operating conditions, the resistance of the PTC resistor decreases as the temperature rises. Therefore, compared to charging circuits using ordinary current-limiting resistors, charging circuits using PTC resistors can reduce power consumption and shorten charging time when used at normal temperatures. Meanwhile, charging circuits using ordinary current-limiting resistors are highly susceptible to excessive current and temperature rise, leading to charging failures. However, in charging circuits using PTC resistors, if the circuit current is too high and the temperature rises, the resistance of the PTC resistor will also increase. When the temperature reaches a certain point, the PTC resistor will effectively open the circuit, preventing charging failures.

[0039] However, it's important to note that, according to the temperature curve of the resistor, the resistance value is higher at low temperatures than at room temperature. During circuit operation, the PTC resistor at low temperatures will draw a greater voltage than the PTC resistor at room temperature. If this drawn voltage reaches the voltage threshold set by the program, causing the charging time to exceed the program's preset charging time, the charging circuit will be judged as a charging fault. Therefore, for air conditioner outdoor units containing PTC resistors, which operate under low-temperature conditions, it is necessary to address the impact of PTC resistor value changes on the reliability of bus capacitor charging and the continuity of system operation.

[0040] Therefore, in order to address the impact of PTC resistor value changes on charging reliability under low-temperature conditions, this invention proposes a control method for a charging circuit, specifically including the following steps:

[0041] Establish the relationship curve between the resistance of the thermistor and temperature in the charging circuit;

[0042] Obtain the resistance value of the thermistor at the current outdoor temperature based on the relationship curve;

[0043] Calculate the charging time for the device to reach the preset charge level under the current outdoor temperature based on the resistance value of the thermistor and the electrical parameters of the charging circuit.

[0044] The total resistance of the charging circuit is adjusted based on a comparison between the current outdoor temperature and the preset temperature, as well as the charging time and the preset charging time.

[0045] The preset temperature refers to the temperature at which low-temperature conditions are judged. When the current outdoor temperature is lower than the preset temperature, it indicates that the charging circuit is operating under low-temperature conditions. In this case, it's necessary to consider that the thermistor in the charging circuit will experience a larger voltage drop due to resistance changes, resulting in excessive voltage draw and causing the actual charging time of the device to exceed the preset charging time. This leads to the charging circuit being judged as having a charging fault. When the current outdoor temperature is greater than or equal to the preset temperature, the effect of resistance changes in the thermistor in the charging circuit does not need to be considered, because... Figure 1 It can be seen that the resistance of the thermistor changes little under normal operating conditions, and the change in voltage drop caused by the change in resistance will not cause the actual charging time to exceed the preset charging time.

[0046] Therefore, simply determining whether the current outdoor temperature is low is insufficient. It is also necessary to determine whether the change in the thermistor's resistance under the current outdoor temperature would cause the actual charging time of the device to exceed the preset charging time set in the program. In this control method, the charging time required for the device to reach the preset charge level under the current outdoor temperature is the actual charging time of the device, and the preset charging time is the preset charging time set in the program. Only by combining these two factors can we accurately determine whether the change in the thermistor's resistance affects the reliability of charging. If it does, the total resistance of the charging circuit needs to be adjusted promptly; if it does not, there is no need to adjust the total resistance of the charging circuit, and the device can be charged directly.

[0047] In summary, the proposed solution comprehensively considers the comparison between the current outdoor temperature and the judgment temperature under low-temperature conditions, as well as the comparison between the actual charging time of the device to be charged and the preset charging time set in the program, to determine whether the resistance change of the thermistor in the charging circuit affects the reliability of charging. If it does, the total resistance of the charging circuit is adjusted in a timely manner. This control method is comprehensive, easy to implement, and perfectly solves the problem of the impact of thermistor resistance change on charging reliability under low-temperature conditions.

[0048] Furthermore, if the current outdoor temperature is greater than or equal to the preset temperature, the total resistance of the charging circuit remains constant while directly charging the device. Alternatively, if 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 of the charging circuit remains constant while directly charging the device. This means that the change in the thermistor's resistance under low-temperature conditions does not affect the reliability of charging, so there is no need to adjust the charging circuit; the device can be charged directly.

[0049] Furthermore, if the current outdoor temperature is lower than the preset temperature and the charging time is longer than the preset charging time, an external resistor is used to reduce the total resistance of the charging circuit before charging the device. This indicates that under low-temperature conditions, the resistance change of the thermistor affects the reliability of charging, causing the actual charging time of the device to exceed the preset charging time at the current room temperature. Therefore, an external resistor is needed to reduce the total resistance of the charging circuit and shorten the actual charging time of the device to be charged so that it does not exceed the preset charging time.

[0050] Furthermore, after the charging circuit starts charging the device to be charged, it is necessary to determine whether the power of the device to be charged has reached the preset power when the charging time of the device to be charged is equal to or greater than the preset charging time. If yes, after the preset buffer time, the total resistance of the charging circuit is adjusted to zero, and the charging is completed. If no, an alarm is triggered to indicate a charging circuit failure. After the preset buffer time, adjusting the total resistance of the charging circuit to zero can make the capacitor voltage more stable.

[0051] In one embodiment, the resistor in the external charging circuit is also a thermistor, and both the external thermistor and the original thermistor in the charging circuit are PTC resistors.

[0052] In addition, the present invention also proposes a charging circuit that uses the control method for the charging circuit described above.

[0053] Furthermore, the charging circuit includes a power supply, a device to be charged, multiple thermistors, and multiple control switches that control the total resistance of the thermistors connected to the charging circuit.

[0054] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0055] like Figure 2 As shown, in this embodiment, an AC power supply powers the device to be charged. Specifically, the AC power supply is connected to a rectifier bridge, and a fuse is connected between the rectifier bridge and the AC power supply. The rectifier bridge converts the AC power into DC power to supply the device to be charged, and the fuse provides overcurrent protection. The output terminal of the rectifier bridge is connected to a first control switch K1, and the other end of the first control switch K1 is connected to a first thermistor R1. A second control switch K2 is connected in parallel across the first thermistor R1, and a third control switch K3 is connected in series with the second thermistor R2 and then in parallel across the first thermistor R1. The other end of the first thermistor R1 and the input terminal of the rectifier bridge are connected to the device to be charged, specifically the parallel bus capacitors C1 and C2. The two ends of the bus capacitor C1 are connected to an IPM module, which converts the DC power into AC power to supply the load. Furthermore, to correct the power factor, a PFC module is also connected in parallel across the bus capacitor C1.

[0056] by Figure 2 The specific charging circuit shown illustrates the specific steps and working principle of the control method for the charging circuit proposed in this invention.

[0057] First, the first thermistor R1 is connected in the initial state of the charging circuit, while the second thermistor R2 is an external resistor, and whether it is connected to the charging circuit is controlled by the third control switch K3. Before charging the bus capacitors C1 and C2, a curve showing the relationship between the resistance of the first thermistor R1 and temperature needs to be established.

[0058] Then obtain the current outdoor temperature T and determine whether the current outdoor temperature T is less than the preset temperature T0;

[0059] If not, it means that the charging circuit is not operating under low temperature conditions. In this case, it is only necessary to directly control the first control switch K1 to close. At this time, the first thermistor R1 is connected to the charging circuit, and the charging circuit charges the bus capacitor C1 and the bus capacitor C2.

[0060] If so, it indicates that the charging circuit is operating under low-temperature conditions, which may affect charging reliability. Therefore, it is necessary to further determine whether the change in the resistance of the first thermistor R1 at the current outdoor temperature will cause the actual charging time of bus capacitors C1 and C2 to exceed the preset charging time set by the program. Specifically, the resistance value of the first thermistor R1 at the current outdoor temperature is obtained based on the established relationship curve. Then, based on the total voltage, total resistance, and capacitance values ​​of bus capacitors C1 and C2, the charging time t required for the voltage of bus capacitors C1 and C2 to reach V1 is calculated. cg Then the charging time t cg Compare with the preset charging time t0 set in the program. When the charging time t0... cg When the charging time is less than or equal to the preset charging time t0, it indicates that the resistance change of the thermistor under low-temperature conditions has not affected the charging reliability, and the actual charging time of the device to be charged at the current room temperature has not exceeded the preset charging time set by the program. At this time, it is only necessary to directly control the first control switch K1 to close to charge the bus capacitor C1 and the bus capacitor C2. When the charging time t cg When the charging time is greater than the preset charging time t0, it indicates that the resistance change of the thermistor under low temperature conditions affects the reliability of charging, causing the actual charging time of the device to be charged at the current room temperature to exceed the preset charging time set by the program. At this time, it is necessary to simultaneously control the third control switch K3 and the first control switch K1 to close, so that the second thermistor R2 is also connected to the charging circuit, thereby reducing the charging time of the bus capacitor C1 and the bus capacitor C2.

[0061] When the total charging time of bus capacitor C1 and bus capacitor C2 is greater than or equal to the preset charging time t0, determine whether the voltage of bus capacitor C1 and bus capacitor C2 has reached V1. That is, if... Figure 3 As shown, if the moment when bus capacitor C1 and bus capacitor C2 start charging is recorded as the zero-second moment, then at time t0, it is determined whether the voltage of bus capacitor C1 and bus capacitor C2 has reached V1.

[0062] If so, after a preset buffer time, the second control switch K2 is closed to adjust the total resistance in the charging circuit to 0. At this time, the bus capacitor completes charging within the preset time set by the program. Afterward, the AC power supply directly supplies power to the bus capacitor and the load through the path formed by the first control switch K1 and the second control switch K2. That is, if... Figure 3 As shown, the second control switch K2 is closed at time t1. The preset buffer time is equal to the time difference between time t1 and time t0. After time t1, both the first thermistor R1 and the second thermistor R2 are short-circuited. The AC power supply directly supplies power to the bus capacitor C1 and the load through the path formed by the first control switch K1 and the second control switch K2. The preset buffer time is left before closing the second control switch K2 so that the second control switch K2 can be closed when the capacitor voltage is more stable.

[0063] If not, directly shut down the PWM signal of the IPM module to stop supplying power to the load and trigger an alarm indicating a charging circuit failure.

[0064] Furthermore, since V1 is less than the rated voltage of bus capacitors C1 and C2, the voltage of bus capacitors C1 and C2 reaches V1 after the charging time meets the preset charging time t0. This is to pre-charge the bus capacitors, which will reduce the inrush current generated when the second control switch K2 is closed and the AC power supply directly supplies power to the bus capacitor C1. Therefore, it can be ensured that the current generated during the process of the AC power supply directly supplying power to the bus capacitor C1 through the first control switch K1 and the second control switch K2 will not exceed the peak current of the first control switch K1 and the second control switch K2, and can also protect the fuse and rectifier bridge.

[0065] Specifically, in this embodiment, the first control switch K1, the second control switch K2, and the third control switch K3 are relays driven by a driver. Furthermore, in this embodiment, V1 is 53% of the rated voltage of the bus capacitor C1. In other embodiments, the first control switch K1, the second control switch K2, and the third control switch K3 can also be other controllable switching devices such as MOSFETs, and the specific value of V1 is not limited and can be set according to actual needs. In addition, in this embodiment, the voltage is used to determine whether the power level of the device to be charged has reached the preset power level; in other embodiments, the current can also be used to determine this.

[0066] Furthermore, this invention also proposes an air conditioner, including a bus capacitor disposed in the outdoor unit of the air conditioner, which is charged using the charging circuit described above. The main chip of the air conditioner pre-stores the relationship curve between the resistance value of a thermistor and temperature, and can also run the program corresponding to the control method of the charging circuit described above. The outdoor unit of the air conditioner is equipped with a temperature sensor to detect the outdoor temperature. Therefore, when the outdoor unit of the air conditioner is powered on, the main chip receives the outdoor temperature detected by the temperature sensor and executes the program corresponding to the control method of the charging circuit described above.

[0067] In addition, the present invention also proposes a computer storage medium for storing a computer program, which executes the control method of the charging circuit proposed above when running.

[0068] It should be noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0070] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for a charging circuit, characterized in that, Including the following steps: Establish the relationship curve between the resistance value and temperature of the thermistor in the charging circuit; The resistance value of the thermistor at the current outdoor temperature is obtained based on the relationship curve. The charging time required for the device to reach a preset charge level under outdoor temperature is calculated based on the resistance value of the thermistor and the electrical parameters of the charging circuit. The total resistance of the charging circuit is adjusted according to the comparison between the outdoor temperature and the preset temperature, the charging time and the preset charging time. Adjusting the total resistance of the charging circuit based on the comparison between the outdoor temperature and the preset temperature, the charging time, and the preset charging time specifically includes the following steps: When the outdoor temperature is greater than or equal to the preset temperature, or when the outdoor temperature is less than the preset temperature and the charging time is less than or equal to the preset charging time, the total resistance of the charging circuit remains unchanged and the device to be charged is charged directly. 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 in the charging circuit before charging the device to be charged.

2. The control method for the charging circuit as described in claim 1, characterized in that, It also includes the following steps: When the charging time of the device to be charged is greater than or equal to the preset charging time, it is determined whether the power of the device to be charged has reached the preset power. If so, after a preset buffer time, adjust the total resistance of the charging circuit to zero, and charging is complete; If not, an alarm will sound for a charging malfunction.

3. The control method for the charging circuit as described in claim 1, characterized in that, The thermistor is a PTC resistor.

4. A charging circuit, characterized in that, The control method of the charging circuit according to any one of claims 1-3.

5. The charging circuit as described in claim 4, characterized in that, It includes a power supply, a device to be charged, multiple thermistors, and a control switch that controls the total resistance of the thermistors connected in the charging circuit.

6. The charging circuit as described in claim 5, characterized in that, It includes a first thermistor, a second thermistor, a first control switch, a second control switch, and a third control switch. The power supply, the first control switch, the first thermistor, and the device to be charged are connected in series. The second control switch is connected in parallel across the first thermistor. The third control switch is connected in series with the second thermistor and then in parallel across the first thermistor.

7. The charging circuit as described in claim 6, characterized in that, When the outdoor temperature is greater than or equal to the preset temperature, or when 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 and third control switches are open.

8. The charging circuit as described in claim 6, characterized in that, When the outdoor temperature is lower 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.

9. The charging circuit as described in claim 7 or 8, characterized in that, When the charging time of the device to be charged is greater than or equal to the preset charging time and the power of the device to be charged reaches the preset power, the second control switch is closed after a preset buffer time.

10. An air conditioner, including a bus capacitor, characterized in that, The bus capacitor is also charged using the charging circuit described in any one of claims 4-9.

11. A computer-readable storage medium for storing a computer program, characterized in that, When the computer program is executed, it performs the control method of the charging circuit as described in any one of claims 1-3.

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