Charging control method, charging control device, and storage medium for power module

Abstract

The present disclosure provides a charging control method, a charging control device and a storage medium of a power module. The power module comprises at least one bootstrap capacitor; the method comprises: detecting a pre-charging requirement of the bootstrap capacitor; when the pre-charging requirement of the bootstrap capacitor is detected, gradually increasing the number of phases charging the bootstrap capacitor. The embodiment of the present disclosure can effectively reduce the impact current generated during charging by gradually increasing the number of phases charging the bootstrap capacitor when the pre-charging requirement of the bootstrap capacitor is detected.

Description

Technical Field

[0001] This disclosure relates to the field of circuit control technology, and in particular to a charging control method, charging control device, and storage medium for a power module. Background Technology

[0002] In related technologies, motor control systems typically include an IPM (Intelligent Power Module). The upper arm switching transistor in the IPM module requires an independent drive power supply. To reduce power supply complexity and cost, a bootstrap circuit (also known as a "boost circuit") is usually used to provide drive power to the upper arm.

[0003] However, when pre-charging the bootstrap capacitor in the bootstrap circuit, the charging method is usually to disconnect the upper bridge arm switch and simultaneously turn on the lower bridge arm switch. This charging method will bring a large inrush current. Summary of the Invention

[0004] This disclosure provides a charging control method, a charging control device, and a storage medium for a power module.

[0005] According to a first aspect of the present disclosure, a charging control method for a power module is provided, the power module comprising: at least one bootstrap capacitor; the method comprising:

[0006] Detect the pre-charge requirement of the bootstrap capacitor;

[0007] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased.

[0008] In some embodiments, the step of gradually increasing the number of phases charging the bootstrap capacitor when a pre-charge requirement for the bootstrap capacitor is detected includes:

[0009] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a pulse width modulation (PWM) signal is used to charge the bootstrap capacitor.

[0010] In some embodiments, when a pre-charging requirement for the bootstrap capacitor is detected, charging the bootstrap capacitor using a pulse width modulation (PWM) signal while gradually increasing the number of phases charging the bootstrap capacitor includes:

[0011] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor.

[0012] In some embodiments, charging the bootstrap capacitor using a PWM signal with a gradually increasing duty cycle includes:

[0013] The PWM signal with the duty cycle gradually increases by incrementing by Dmin% to charge the bootstrap capacitor; wherein, Dmin% is the minimum duty cycle of the PWM signal.

[0014] In some embodiments, the method further includes:

[0015] When the duty cycle of the PWM signal reaches Dmax%, the PWM signal is stopped from increasing; wherein, Dmax% is: the maximum duty cycle of the PWM signal, or an integer multiple of Dmin%.

[0016] In some embodiments, the step of gradually increasing the number of phases charging the bootstrap capacitor when a pre-charge requirement for the bootstrap capacitor is detected includes:

[0017] When initiating the pre-charging of the bootstrap capacitor, the bootstrap capacitor is charged in phase U;

[0018] When the charging state of the bootstrap capacitor reaches the first condition, the bootstrap capacitor is charged with the U phase and the V phase.

[0019] When the charging state of the bootstrap capacitor reaches the second condition, the bootstrap capacitor is charged with phases U, V, and W.

[0020] In some embodiments, the first condition is: the charging time of the bootstrap capacitor charged by the U phase reaches a first preset time; and / or,

[0021] The second condition is: the charging time for charging the bootstrap capacitor with the U phase and V phase reaches a second preset time.

[0022] In some embodiments, the first condition is: the current charge value of the bootstrap capacitor reaches a first preset charge value;

[0023] And / or, the second condition is: the current charge value of the bootstrap capacitor reaches the second preset charge value.

[0024] In some embodiments, the power module includes: a first bootstrap capacitor corresponding to U, a second bootstrap capacitor corresponding to V, and a third bootstrap capacitor corresponding to W.

[0025] The charging of the bootstrap capacitor with phase U includes:

[0026] The first bootstrap capacitor is charged through phase U;

[0027] The charging of the bootstrap capacitor using the U phase and V phase includes:

[0028] The first bootstrap capacitor is charged through phase U, while the second bootstrap capacitor is charged through phase V.

[0029] The charging of the bootstrap capacitor using the U-phase, V-phase, and W-phase includes:

[0030] The first bootstrap capacitor is charged through phase U, the second bootstrap capacitor is charged through phase V, and the third bootstrap capacitor is charged simultaneously through phase W.

[0031] In some embodiments, the method further includes:

[0032] Once the bootstrap capacitor is fully charged or exits the pre-charge state, the bootstrap capacitor is continuously charged using a PWM signal according to its charging state.

[0033] According to a second aspect of the present disclosure, a charging control device for a power module is provided, the power module comprising: at least one bootstrap capacitor; the device comprising:

[0034] A detection module is used to detect the pre-charge requirement of the bootstrap capacitor;

[0035] The charging module is used to gradually increase the number of phases charging the bootstrap capacitor when a pre-charging requirement of the bootstrap capacitor is detected.

[0036] In some embodiments, the charging module is used for:

[0037] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a pulse width modulation (PWM) signal is used to charge the bootstrap capacitor.

[0038] In some embodiments, the charging module is used for:

[0039] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor.

[0040] In some embodiments, the charging module is used for:

[0041] The PWM signal with the duty cycle gradually increases by incrementing by Dmin% to charge the bootstrap capacitor; wherein, Dmin% is the minimum duty cycle of the PWM signal.

[0042] In some embodiments, the charging module is further configured to:

[0043] When the duty cycle of the PWM signal reaches Dmax%, the PWM signal is stopped from increasing; wherein, Dmax% is: the maximum duty cycle of the PWM signal, or an integer multiple of Dmin%.

[0044] In some embodiments, the charging module is used for:

[0045] When initiating the pre-charging of the bootstrap capacitor, the bootstrap capacitor is charged in phase U;

[0046] When the charging state of the bootstrap capacitor reaches the first condition, the bootstrap capacitor is charged with the U phase and the V phase.

[0047] When the charging state of the bootstrap capacitor reaches the second condition, the bootstrap capacitor is charged with phases U, V, and W.

[0048] In some embodiments, the first condition is: the charging time of the bootstrap capacitor charged by the U phase reaches a first preset time; and / or,

[0049] The second condition is: the charging time for charging the bootstrap capacitor with the U phase and V phase reaches a second preset time.

[0050] In some embodiments, the first condition is: the current charge value of the bootstrap capacitor reaches a first preset charge value;

[0051] And / or, the second condition is: the current charge value of the bootstrap capacitor reaches the second preset charge value.

[0052] In some embodiments, the power module includes: a first bootstrap capacitor corresponding to U, a second bootstrap capacitor corresponding to V, and a third bootstrap capacitor corresponding to W.

[0053] The charging module is used to charge the first bootstrap capacitor through the U phase.

[0054] The charging module is used to charge the first bootstrap capacitor through the U phase and simultaneously charge the second bootstrap capacitor through the V phase.

[0055] The charging module is used to charge the first bootstrap capacitor through the U phase, charge the second bootstrap capacitor through the V phase, and simultaneously charge the third bootstrap capacitor through the W phase.

[0056] In some embodiments, the charging module is further configured to:

[0057] Once the bootstrap capacitor is fully charged or exits the pre-charge state, the bootstrap capacitor is continuously charged using a PWM signal according to its charging state.

[0058] According to a third aspect of the present disclosure, an electronic device is provided, including a processor, a memory, and an executable program stored in the memory and executable by the processor, wherein the processor executes the steps of a charging control method for a power module as described in any of the first aspects when running the executable program.

[0059] According to a fourth aspect of the present disclosure, a storage medium is provided having an executable program stored thereon, which, when executed by a processor, implements the steps of the charging control method for a power module as described in any of the first aspects.

[0060] This disclosure provides a charging control method, charging control device, and storage medium for a power module. The power module includes at least one bootstrap capacitor. The method includes: detecting a pre-charging demand of the bootstrap capacitor; and when the pre-charging demand is detected, gradually increasing the number of phases charging the bootstrap capacitor. Thus, by employing a charging method that gradually increases the number of phases charging the bootstrap capacitor, the impact caused by DC charging or using the maximum charging current at the start of pre-charging can be effectively reduced.

[0061] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0062] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0063] Figure 1 This is a schematic diagram of a bootstrap capacitor charging principle;

[0064] Figure 2 This is a flowchart illustrating a charging control method for a power module according to an embodiment of the present disclosure;

[0065] Figure 3 This is a flowchart illustrating another charging control method for a power module according to an embodiment of the present disclosure;

[0066] Figure 4 This is a flowchart illustrating another charging control method for a power module according to an embodiment of the present disclosure;

[0067] Figure 5 This is a topology schematic diagram of a charging control system according to an embodiment of the present disclosure;

[0068] Figure 6 This is a schematic diagram illustrating a PWM pulse group according to an embodiment of the present disclosure;

[0069] Figure 7This is a structural block diagram of a charging control device for a power module according to an embodiment of the present disclosure;

[0070] Figure 8 This is a structural block diagram of an electronic device according to an embodiment of the present disclosure. Detailed Implementation

[0071] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of the present invention as detailed in the appended claims.

[0072] The terminology used in this embodiment of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of the invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0073] It should be understood that although the terms "first," "second," etc., may be used in embodiments of the present invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of embodiments of the present invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if," as used herein, can be interpreted as "when," "in response to a determination," or "when," or "in the event of a determination."

[0074] Taking an air conditioner inverter motor as an example, the control system of an air conditioner inverter motor typically includes an IPM module circuit. The upper bridge drive of the six switching transistors in the IPM module is not at the same potential, requiring an independent drive power supply. To reduce power supply complexity and cost, a bootstrap circuit is usually used to provide drive power to the upper bridge. The bootstrap circuit, also called a boost circuit, uses electronic components such as bootstrap diodes and bootstrap capacitors to superimpose the capacitor discharge voltage and the power supply voltage, thereby increasing the voltage.

[0075] A bootstrap circuit typically consists of a bootstrap diode, a bootstrap capacitor, and a bootstrap resistor. During the operation of the load motor, the bootstrap circuit provides the bootstrap voltage for the normal operation of the upper arm switching transistor of the IPM module. Before the motor starts, to ensure the upper arm can operate normally, the bootstrap capacitor usually needs to be pre-charged to meet the operating voltage required for the upper arm to start normal operation.

[0076] Figure 1 This is a schematic diagram of a bootstrap capacitor charging principle, such as... Figure 1 As shown, taking phase U as an example, the upper bridge arm drive circuit HVIC (High Voltage Integrated Circuit) controls the conduction or disconnection of the upper bridge arm switching transistor P-IGBT (Insulated Gate Bipolar Transistor) of the IPM module, and the lower bridge arm drive circuit LVIC (Low Voltage Integrated Circuit) controls the conduction or disconnection of the lower bridge arm switching transistor N-IGBT of the IPM module. The bootstrap resistor, bootstrap diode, and bootstrap capacitor V... DB The bootstrap circuit that constitutes phase U has a power supply V. D The lower bridge arm drive circuit is powered by the LVIC, and the power supply V... D Lower bridge arm switching transistor, bootstrap resistor, bootstrap diode, bootstrap capacitor V DB It constitutes such as Figure 1 The charging circuit is shown by the dashed line. The bootstrap circuit works as follows: after inputting the control signal VIN(N) to the drive circuit LVIC, it controls the lower bridge arm drive circuit LVIC to turn on the lower bridge arm switching transistor N-side IGBT, controlling the power supply V. D The charging circuit, consisting of a bootstrap resistor, a bootstrap diode, and an N-side IGBT (lower bridge arm switch), supplies power to the bootstrap capacitor V. DB Charging. Due to the bootstrap capacitor V DB Connected to the upper bridge arm drive circuit HVIC, therefore, the bootstrap capacitor V DB It can provide power to the upper bridge arm drive circuit HVIC, so that the upper bridge arm drive circuit HVIC can drive the upper bridge arm switching transistor to work normally.

[0077] When pre-charging the bootstrap capacitor, a charging method can be adopted by disconnecting the three-phase upper bridge while simultaneously turning on the three-phase lower bridge. This charging method will bring a large inrush current. If the values ​​of the bootstrap resistor and the bootstrap capacitor are not selected appropriately, the current flowing through the sampling resistor can easily trigger the overcurrent protection value, resulting in a protection fault, or even damaging the bootstrap components.

[0078] Figure 2 This is a flowchart illustrating a charging control method for a power module according to an embodiment of the present disclosure. The power module includes: at least one bootstrap capacitor; such as Figure 2 As shown, the method may include the following steps:

[0079] S10 detects the pre-charge requirement of the bootstrap capacitor.

[0080] S20, when the pre-charging requirement of the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased.

[0081] The charging control method for the power module provided in this disclosure can be applied to a controller, which can be a microcontroller unit (MCU) or an embedded controller (EC). The power module can be an IPM module used to drive a motor to rotate, such as a compressor motor or a fan motor.

[0082] The power module may contain one or more bootstrap capacitors. Multiple bootstrap capacitors may be connected in parallel.

[0083] In step S10, the pre-charge requirement of the bootstrap capacitor can be detected based on whether the pre-charge entry condition is triggered. When the pre-charge entry condition is triggered, it is determined that the pre-charge requirement of the bootstrap capacitor has been detected; when the pre-charge entry condition is not triggered, it is determined that the pre-charge requirement of the bootstrap capacitor has not been detected.

[0084] In one example, the pre-charge entry condition may include receiving a motor start command. The motor start command is used to instruct the motor to start. The motor start command can be a level signal generated after the user manually triggers a switch, or it can be a start command issued by another control system via a communication connection; no specific limitation is made here.

[0085] In step S20, when the pre-charging requirement of the bootstrap capacitor is detected, the number of charging circuits with the corresponding number of phases are gradually increased to charge the bootstrap capacitor.

[0086] In this embodiment of the disclosure, the pre-charging of the bootstrap capacitor is multi-phase charging. Initially, charging can be performed using one phase or fewer than the total number of phases, and then the number of charging phases is gradually increased. Here, the maximum number of charging phases for the bootstrap capacitor can be two phases, three phases, or more than three phases.

[0087] In one embodiment, if the maximum number of charging phases of the bootstrap capacitor is three phases, then step S20 may include:

[0088] When a pre-charging requirement for the bootstrap capacitor is detected, one phase of the charging circuit is turned on to charge the bootstrap capacitor, then two phases of the charging circuit are turned on to charge the bootstrap capacitor, and finally all three phases of the charging circuit are turned on to charge the bootstrap capacitor.

[0089] Specifically, in the first stage, the controller can charge the bootstrap capacitor through the U-phase charging circuit. In the second stage, the bootstrap capacitor is charged through the U-phase charging circuit and the V-phase charging circuit respectively. In the third stage, the bootstrap capacitor is charged through the U-phase charging circuit, the V-phase charging circuit, and the W-phase charging circuit respectively.

[0090] Specifically, for any one of the three phases U, V, and W, the controller can control the lower bridge arm switch transistor of that phase to turn on by outputting a control signal to the lower bridge arm drive circuit of that phase, thereby forming a charging circuit for that phase to charge the bootstrap capacitor.

[0091] In one example, when the bootstrap capacitor is charged through the charging circuit of phase U, the controller can control the lower bridge arm switch of phase U to turn on through the lower bridge arm drive circuit of phase U, forming the charging circuit of phase U, and then charge the bootstrap capacitor through the charging circuit of phase U.

[0092] When the bootstrap capacitor is charged through the V-phase charging circuit, the controller can turn on the lower bridge arm switch of the V-phase through the lower bridge arm drive circuit of the V-phase to form the V-phase charging circuit, and then charge the bootstrap capacitor through the V-phase charging circuit.

[0093] When the bootstrap capacitor is charged through the charging circuit of phase W, the controller can control the lower bridge arm switch of phase W to be turned on through the lower bridge arm drive circuit of phase W, forming the charging circuit of phase W, and then charge the bootstrap capacitor through the charging circuit of phase W.

[0094] This disclosure provides a charging control method for a power module. By detecting the pre-charging demand of the bootstrap capacitor, when the pre-charging demand of the bootstrap capacitor is detected, the inrush current generated during pre-charging can be effectively reduced by adopting a charging method that gradually increases the number of phases charging the bootstrap capacitor.

[0095] In some embodiments, the step of gradually increasing the number of phases charging the bootstrap capacitor when a pre-charging requirement of the bootstrap capacitor is detected may include:

[0096] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a pulse width modulation (PWM) signal is used to charge the bootstrap capacitor.

[0097] Among them, the PWM signal is a pulse signal with a variable duty cycle. The duty cycle refers to the proportion of time that the high level of the PWM signal occupies within one cycle.

[0098] The controller may include a PWM unit for generating PWM control signals and outputting them to the power module.

[0099] For any one of the three phases, when the PWM signal is high, the lower bridge arm switch of that phase is turned on to form a charging circuit for that phase, thereby charging the bootstrap capacitor through that phase's charging circuit. When the PWM signal is low, the lower bridge arm switch of that phase is turned off to disconnect the charging circuit for that phase, thereby stopping the charging of the bootstrap capacitor through that phase. In this way, the bootstrap capacitor charging circuit is periodically turned on or off according to the PWM control signal, which also realizes the periodic on and off of the bootstrap capacitor charging in the time domain, thereby realizing PWM signal charging. Compared with DC charging at the beginning of precharging, this can reduce the current surge during the precharging of the bootstrap capacitor.

[0100] In one example, the implementation process of the above steps may include:

[0101] When the bootstrap capacitor is charged through the charging circuit of phase U, the control signal for the lower bridge arm switching transistor output by the lower bridge arm drive circuit of phase U is the PWM signal.

[0102] When the bootstrap capacitor is charged through the charging circuit of phase U and phase V, the control signals of the lower bridge arm switching transistors output by the lower bridge arm drive circuits of phase U and phase V are the PWM signals.

[0103] When the bootstrap capacitor is charged through the charging circuits of phase U, phase V, and phase W, the control signals for the lower bridge arm switching transistors output by the lower bridge arm drive circuits of phases U, V, and W are all the PWM signals.

[0104] For example, taking phase U as an example, when the PWM signal output by the lower bridge arm drive unit controlling phase U is at a high level, the lower bridge arm switch of phase U is turned on, thereby controlling the power supply to charge the bootstrap capacitor through the charging circuit of phase U; when the PWM signal output by the lower bridge arm drive unit controlling phase U is at a low level, the lower bridge arm switch of phase U is turned off, thereby disconnecting the charging circuit of phase U, at which point the power supply stops charging the bootstrap capacitor.

[0105] In this embodiment of the disclosure, when the pre-charging requirement of the bootstrap capacitor is detected, while gradually increasing the number of phases charging the bootstrap capacitor, the bootstrap capacitor is charged by using a pulse width modulation (PWM) signal. Compared with the charging method of using a single pulse to directly conduct, this can further reduce the inrush current generated during pre-charging.

[0106] In some embodiments, when a pre-charging requirement of the bootstrap capacitor is detected, charging the bootstrap capacitor using a pulse width modulation (PWM) signal while gradually increasing the number of phases charging the bootstrap capacitor may include:

[0107] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor.

[0108] Specifically, the PWM signal can be gradually increased from the initial duty cycle to the maximum duty cycle using either a linear or non-linear increase method, wherein the initial duty cycle is greater than 0 and the maximum duty cycle is less than or equal to 100%.

[0109] For example, the duty cycle of the PWM signal is gradually increased according to a preset step size. The preset step size can be set according to the actual situation and is not specifically limited here.

[0110] In this embodiment of the disclosure, while gradually increasing the number of phases charging the bootstrap capacitor, a PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor, which reduces the inrush current and speeds up the bootstrap charging time.

[0111] In some embodiments, charging the bootstrap capacitor using a PWM signal with a gradually increasing duty cycle includes:

[0112] The PWM signal with the duty cycle gradually increases by incrementing by Dmin% to charge the bootstrap capacitor; wherein, Dmin% is the minimum duty cycle of the PWM signal.

[0113] Where Dmin% is the increment step, that is, the duty cycle of the next PWM signal is equal to the duty cycle of the current PWM signal plus Dmin%, until the maximum duty cycle is reached. The maximum duty cycle of the PWM signal is less than or equal to 100%.

[0114] In one embodiment, the maximum duty cycle of the PWM signal is less than 100%, specifically 50%, 60%, or 70%.

[0115] Here, for any one of the three phases, the minimum duty cycle Dmin% of the PWM signal used to turn on the charging circuit of that phase to charge the bootstrap capacitor can be determined based on the minimum turn-on voltage of the lower bridge arm switch of that phase.

[0116] In some embodiments, Dmin% is any value between 5% and 25%, for example, Dmin% is 10% or 20%.

[0117] In this embodiment of the disclosure, by gradually increasing the duty cycle of the PWM signal to charge the bootstrap capacitor with Dmin% as the increment step, the situation where the inrush current of the charging circuit increases rapidly due to the rapid increase of the duty cycle of the PWM signal can be suppressed, thereby improving the stability of the bootstrap capacitor charging.

[0118] In some embodiments, the step size for increasing the duty cycle of the PWM signal is not limited to Dmin%, but can be 5% or 10% as an example.

[0119] In some embodiments, the method may further include:

[0120] When the duty cycle of the PWM signal reaches Dmax%, the PWM signal is stopped from increasing; wherein, Dmax% is: the maximum duty cycle of the PWM signal, or an integer multiple of Dmin%.

[0121] Specifically, the maximum duty cycle of the PWM signal can be set according to actual needs. Compared to DC charging at the beginning of pre-charging, this can reduce the current surge to the bootstrap capacitor.

[0122] In some embodiments, Dmax% is any value between 80% and 100%, for example, Dmax% is 80% or 90%, etc.

[0123] In this embodiment of the disclosure, by stopping the increase of the PWM signal when the duty cycle of the PWM signal reaches Dmax%, the situation where the inrush current of the charging circuit is too large due to the excessive duty cycle of the PWM signal can be suppressed, thereby improving the stability of the bootstrap capacitor charging.

[0124] In some embodiments, such as Figure 3 As shown, in step S20 above, the step of gradually increasing the number of phases charging the bootstrap capacitor when the pre-charging requirement of the bootstrap capacitor is detected may include:

[0125] S21, when initiating the pre-charging of the bootstrap capacitor, the bootstrap capacitor is charged in phase U;

[0126] S22, when the charging state of the bootstrap capacitor reaches the first condition, the bootstrap capacitor is charged with the U phase and the V phase.

[0127] S23, when the charging state of the bootstrap capacitor reaches the second condition, the bootstrap capacitor is charged with phases U, V and W.

[0128] The charging state of the bootstrap capacitor includes at least one of the following: the charging duration of the bootstrap capacitor, the charge of the bootstrap capacitor, and the charging current of the bootstrap capacitor.

[0129] Both the first and second conditions can be set according to actual application needs. For example,

[0130] In some embodiments, the first condition is: the current charge value of the bootstrap capacitor reaches a first preset charge value, and / or the second condition is: the current charge value of the bootstrap capacitor reaches a second preset charge value.

[0131] Here, the first preset battery level and the second preset battery level can be set according to actual application needs. For example, the first preset battery level can be any value between 30% and 50%, and the second preset battery level can be any value between 60% and 80%.

[0132] In some embodiments, the first condition is: the charging time of the bootstrap capacitor charged with the U phase reaches a first preset time; and / or, the second condition is: the charging time of the bootstrap capacitor charged with both the U phase and the V phase reaches a second preset time.

[0133] The first preset duration and the second preset duration can be set according to actual application needs. For example, the first preset duration is the charging time for the current charge of the bootstrap capacitor to reach the first preset charge value; the second preset duration is the charging time for the current charge of the bootstrap capacitor to reach the second preset charge value. This embodiment does not specifically limit these durations.

[0134] Here, the charging time for the bootstrap capacitor charged by the U phase and V phase is the interval between the current time point and the time point when the charging time for the bootstrap capacitor charged by the U phase reaches the first preset time.

[0135] For example, the first preset duration may be equal to the second preset duration, or the first preset duration may not be equal to the second preset duration.

[0136] In step S21, when starting the pre-charging of the bootstrap capacitor, a first PWM signal with a gradually increasing duty cycle can be used to charge the bootstrap capacitor in phase U.

[0137] In step S22, when the charging state of the bootstrap capacitor reaches the first condition, a second PWM signal with a fixed duty cycle can be used to charge the bootstrap capacitor in phase U, and at the same time, a first PWM signal with a gradually increasing duty cycle can be used to charge the bootstrap capacitor in phase V; wherein, the duty cycle of the second PWM signal is equal to the maximum duty cycle of the first PWM signal.

[0138] In step S23, when the charging state of the bootstrap capacitor reaches the second condition, a second PWM signal with a fixed duty cycle can be used to charge the bootstrap capacitor in phases U and V respectively, while a first PWM signal with a gradually increasing duty cycle can be used to charge the bootstrap capacitor in phase W.

[0139] In this embodiment of the disclosure, by gradually increasing the number of phases charging the bootstrap capacitor according to its charging state, the inrush current in the charging circuit can be effectively reduced.

[0140] In some embodiments, the power module includes: a first bootstrap capacitor corresponding to U, a second bootstrap capacitor corresponding to V, and a third bootstrap capacitor corresponding to W.

[0141] The step of charging the bootstrap capacitor via the U phase may include: charging the first bootstrap capacitor via the U phase.

[0142] Specifically, the controller can charge the first bootstrap capacitor through the charging circuit of phase U.

[0143] The charging of the bootstrap capacitor via the U phase and V phase may include: charging the first bootstrap capacitor via the U phase, and simultaneously charging the second bootstrap capacitor via the V phase.

[0144] Specifically, the controller can charge the first bootstrap capacitor through the U-phase charging circuit and simultaneously charge the second bootstrap capacitor through the V-phase charging circuit.

[0145] The charging of the bootstrap capacitor via the U phase, V phase, and W phase may include: charging the first bootstrap capacitor via the U phase, charging the second bootstrap capacitor via the V phase, and simultaneously charging the third bootstrap capacitor via the W phase.

[0146] Specifically, the controller can charge the first bootstrap capacitor through the U-phase charging circuit, charge the second bootstrap capacitor through the V-phase charging circuit, and simultaneously charge the third bootstrap capacitor through the W-phase charging circuit.

[0147] In some embodiments, the first condition is: the current charge value of the first bootstrap capacitor reaches a first preset charge value; the second condition is: the current charge value of the second bootstrap capacitor reaches a second preset charge value.

[0148] In one example, the first preset power level can be the power level when the first bootstrap capacitor is fully charged, i.e., the first preset power level is 100%; the second preset power level can be the power level when the second bootstrap capacitor is fully charged, i.e., the second preset power level is 100%.

[0149] In another example, the first preset battery level can be any value between 50% and 100%. The second preset battery level can also be any value between 50% and 100%.

[0150] In one example, the implementation process of step S20 above may include:

[0151] When the pre-charging requirement of the bootstrap capacitor is detected, a first PWM signal with a gradually increasing duty cycle can be used to charge the first bootstrap capacitor through the charging circuit of the U phase.

[0152] When the current charge value of the first bootstrap capacitor reaches the charge value when the first bootstrap capacitor is fully charged, a second PWM signal with a fixed duty cycle is used to charge the first bootstrap capacitor through the U-phase charging circuit, and at the same time, a first PWM signal with a gradually increasing duty cycle is used to charge the second bootstrap capacitor through the V-phase charging circuit, wherein the duty cycle of the second PWM signal is equal to the maximum duty cycle of the first PWM signal.

[0153] When the current charge value of the second bootstrap capacitor reaches the charge value when the second bootstrap capacitor is fully charged, a second PWM signal with a fixed duty cycle is used to charge the first bootstrap capacitor through the U-phase charging circuit and the second bootstrap capacitor through the V-phase charging circuit. At the same time, a first PWM signal with a gradually increasing duty cycle is used to charge the third bootstrap capacitor through the W-phase charging circuit.

[0154] Understandably, during the charging process, the first bootstrap capacitor is charged via phase U until it is fully charged, with only phase U generating charging current. When the first bootstrap capacitor is fully charged, it is charged again via phase U to prevent it from discharging. Simultaneously, the second bootstrap capacitor is charged via phase V until it is fully charged, again with only phase V generating charging current. Similarly, when the first bootstrap capacitor is fully charged, it continues to charge via phase U, and when the second bootstrap capacitor is fully charged, it continues to charge via phase V to prevent both from discharging. Then, the third bootstrap capacitor is charged via phase W until it is fully charged, again with only phase W generating charging current. This ensures that only one phase generates charging current throughout the entire charging process, effectively reducing the inrush current generated during pre-charging.

[0155] In some embodiments, such as Figure 4 As shown, based on Figure 1 The method may further include:

[0156] S30: After the bootstrap capacitor is fully charged or exits the pre-charge state, the bootstrap capacitor is continuously charged with a PWM signal according to its charging state.

[0157] In this embodiment, after the bootstrap capacitor is fully charged or exits the pre-charge state, bootstrap capacitor charging ceases, and the motor start-up control phase begins. At this time, based on the charging state of the bootstrap capacitor, charging is maintained using a PWM signal to the bootstrap capacitor. Thus, the bootstrap capacitor V... DB Power can be supplied to the upper arm drive circuit HVIC of the power module, enabling the power module to turn on or off each upper arm switch transistor in the power module according to a preset timing sequence, thereby supplying power to the U, V, and W three-phase circuits of the motor in sequence and ensuring the normal operation of the motor.

[0158] The charging control method for the power module provided in this disclosure will be further explained below with reference to specific embodiments.

[0159] Figure 5 This is a topology diagram of a charging control system according to an embodiment of the present disclosure. The entire control system includes: an MCU unit, a PWM drive unit (not shown in the figure), an IPM module unit, a current sampling unit (including a sampling resistor Rs and an operational amplifier circuit IC1), and a current protection unit (not shown in the figure).

[0160] MCU unit: used to provide PWM drive signals;

[0161] PWM drive unit: used to provide drive signals to the six switching transistors of the IPM module;

[0162] IPM Module Unit: Based on the drive signal from the PWM drive unit, the six switching transistors of the IPM module are controlled to operate, thereby driving the motor to rotate.

[0163] Current sampling unit: used to sample the current signal flowing through the sampling resistor and amplify the signal to the MCU unit and the current protection unit.

[0164] Current protection unit: When the current sampled by the current sampling unit exceeds the overcurrent protection setting value, it triggers the overcurrent protection signal output to the MCU.

[0165] The IPM module outputs three-phase current at its U, V, and W terminals. This means that the three output terminals of the IPM module can be connected to the air conditioner motor to provide three-phase current to the air conditioner motor.

[0166] When the IPM module controls the motor to work, the IPM module and the power supply V DCA current loop is formed between them. Since the sampling resistor Rs is connected in series within this current loop, the current in the current loop will pass through the sampling resistor Rs, ultimately forming a voltage divider, i.e., the sampling voltage, across the sampling resistor Rs. After obtaining the sampling voltage, the operational amplifier circuit IC1 can obtain the sampling current, i.e., the current current of the motor, through voltage-to-current conversion.

[0167] The charging control method for the power module provided in this disclosure embodiment may specifically include:

[0168] 1. Check whether the bootstrap capacitor charging entry condition is met. The bootstrap capacitor charging entry condition can be that the MCU receives a motor start command. When the MCU unit receives the motor start command, it immediately executes bootstrap capacitor charging.

[0169] 2. The bootstrap capacitor charging process is as follows:

[0170] (1) Time interval from 0 to t:

[0171] The bootstrap capacitor of phase U is charged, wherein...

[0172] The first PWM cycle: The U-phase lower bridge outputs a PWM signal with a duty cycle of 1*Dmin%.

[0173] The second PWM cycle: The U-phase lower bridge outputs a PWM signal with a duty cycle of 2*Dmin%.

[0174] ...

[0175] The nth PWM cycle: The U-phase lower bridge outputs a PWM signal with a duty cycle of n*Dmin%.

[0176] When n*Dmin%>Dmax%, the duty cycle of the PWM signal output by the U-phase lower bridge is Dmax%.

[0177] (2) Time period from t to 2t:

[0178] The bootstrap capacitors of phase U and phase V are charged, wherein:

[0179] The U-phase continuously maintains a PWM signal output with a duty cycle of Dmax%.

[0180] The first PWM cycle: The V-phase lower bridge outputs a PWM signal with a duty cycle of 1*Dmin%.

[0181] The second PWM cycle: The V-phase lower bridge outputs a PWM signal with a duty cycle of 2*Dmin%.

[0182] ...

[0183] The nth PWM cycle: The V-phase lower bridge outputs a PWM signal with a duty cycle of n*Dmin%.

[0184] When n*Dmin%>Dmax%, the duty cycle of the PWM signal output by the V-phase lower bridge is Dmax%.

[0185] (3) 2t to 3t time period

[0186] The bootstrap capacitors of phase U, phase V, and phase W are charged, wherein:

[0187] The U and V phases continuously maintain a PWM signal output with a duty cycle of Dmax%.

[0188] The first PWM cycle: The lower bridge of the W phase outputs a PWM signal with a duty cycle of 1*Dmin%.

[0189] The second PWM cycle: The lower bridge of the W phase outputs a PWM signal with a duty cycle of 2*Dmin%.

[0190] ...

[0191] The nth PWM cycle: The W-phase lower bridge outputs a PWM signal with a duty cycle of n*Dmin%.

[0192] When n*Dmin%>Dmax%, the duty cycle of the PWM signal output by the W-phase lower bridge is Dmax%.

[0193] In the above embodiments, both the first preset duration and the second preset duration can be equal to t.

[0194] The PWM pulse group for the bootstrap capacitor charging process described above can be referenced. Figure 6 As shown.

[0195] 3. Check whether the bootstrap capacitor charging exit condition is met. The bootstrap capacitor charging exit condition can be that the charging time reaches 3t. When the charging time reaches 3t, exit the bootstrap capacitor charging and enter the normal motor start control.

[0196] The charging control method for the power module in the above embodiments has at least the following beneficial effects:

[0197] 1) During bootstrap charging, the lower bridge uses a PWM pulse group instead of direct conduction to reduce inrush current.

[0198] 2) The three-phase U, V and W charging method is adopted, which reduces the inrush current compared to three-phase simultaneous charging.

[0199] 3) The duty cycle of the PWM pulse group gradually increases from the minimum duty cycle, which speeds up the bootstrap charging time.

[0200] Figure 7 This is a schematic diagram of a charging control device for a power module according to an embodiment of the present disclosure. The power module includes at least one bootstrap capacitor; the charging control device 700 includes:

[0201] The detection module 710 is used to detect the pre-charge requirement of the bootstrap capacitor;

[0202] The charging module 720 is used to gradually increase the number of phases charging the bootstrap capacitor when a pre-charging requirement of the bootstrap capacitor is detected.

[0203] In some embodiments, the charging module 720 is used for:

[0204] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a pulse width modulation (PWM) signal is used to charge the bootstrap capacitor.

[0205] In some embodiments, the charging module 720 is used for:

[0206] When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor.

[0207] In some embodiments, the charging module 720 is used for:

[0208] The PWM signal with the duty cycle gradually increases by incrementing by Dmin% to charge the bootstrap capacitor; wherein, Dmin% is the minimum duty cycle of the PWM signal.

[0209] In some embodiments, the charging module 720 is further configured to:

[0210] When the duty cycle of the PWM signal reaches Dmax%, the PWM signal is stopped from increasing; wherein, Dmax% is: the maximum duty cycle of the PWM signal, or an integer multiple of Dmin%.

[0211] In some embodiments, the charging module 720 is used for:

[0212] When initiating the pre-charging of the bootstrap capacitor, the bootstrap capacitor is charged in phase U;

[0213] When the charging state of the bootstrap capacitor reaches the first condition, the bootstrap capacitor is charged with the U phase and the V phase.

[0214] When the charging state of the bootstrap capacitor reaches the second condition, the bootstrap capacitor is charged with phases U, V, and W.

[0215] In some embodiments, the first condition is: the charging time of the bootstrap capacitor charged by the U phase reaches a first preset time; and / or,

[0216] The second condition is: the charging time for charging the bootstrap capacitor with the U phase and V phase reaches a second preset time.

[0217] In some embodiments, the first condition is: the current charge value of the bootstrap capacitor reaches a first preset charge value;

[0218] And / or, the second condition is: the current charge value of the bootstrap capacitor reaches the second preset charge value.

[0219] In some embodiments, the power module includes: a first bootstrap capacitor corresponding to U, a second bootstrap capacitor corresponding to V, and a third bootstrap capacitor corresponding to W.

[0220] The charging module 720 is used to charge the first bootstrap capacitor through the U phase;

[0221] The charging module 720 is used to charge the first bootstrap capacitor through the U phase and simultaneously charge the second bootstrap capacitor through the V phase.

[0222] The charging module 720 is used to charge the first bootstrap capacitor through the U phase, charge the second bootstrap capacitor through the V phase, and simultaneously charge the third bootstrap capacitor through the W phase.

[0223] In some embodiments, the charging module 720 is further configured to:

[0224] Once the bootstrap capacitor is fully charged or exits the pre-charge state, the bootstrap capacitor is continuously charged using a PWM signal according to its charging state.

[0225] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0226] In an exemplary embodiment, the detection module 710, charging module 720, etc., may be implemented by one or more central processing units (CPUs), graphics processing units (GPUs), baseband processors (BPs), application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to perform the aforementioned method.

[0227] Figure 8 This is a block diagram illustrating an electronic device 800 according to an exemplary embodiment. For example, the electronic device 800 may be an air conditioning device, etc.

[0228] Reference Figure 8 The electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0229] Processing component 802 typically controls the overall operation of electronic device 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0230] Memory 804 is configured to store various types of data to support the operation of electronic device 800. Examples of this data include instructions for any application or method operating on electronic device 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0231] Power supply component 806 provides power to various components of electronic device 800. Power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 800.

[0232] Multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the electronic device 800 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0233] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when electronic device 800 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0234] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0235] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of electronic device 800. For example, sensor assembly 814 can detect the on / off state of electronic device 800, the relative positioning of components such as the display and keypad of electronic device 800, changes in position of electronic device 800 or a component of electronic device 800, the presence or absence of user contact with electronic device 800, orientation or acceleration / deceleration of electronic device 800, and temperature changes of electronic device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0236] Communication component 816 is configured to facilitate wired or wireless communication between electronic device 800 and other devices. Electronic device 800 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0237] In an exemplary embodiment, the electronic device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0238] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 804 including instructions, which can be executed by a processor 820 of an electronic device 800 to perform the above-described method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0239] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0240] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A charging control method for a power module, characterized in that, The power module includes: at least one bootstrap capacitor; the method includes: Detect the pre-charge requirement of the bootstrap capacitor; When a pre-charge requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased, including: When initiating the pre-charging of the bootstrap capacitor, a first PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor in phase U. When the charging state of the bootstrap capacitor reaches the first condition, a second PWM signal with a fixed duty cycle is used to charge the bootstrap capacitor with the U phase and the V phase; the duty cycle of the second PWM signal is equal to the maximum duty cycle of the first PWM signal. When the charging state of the bootstrap capacitor reaches the second condition, a second PWM signal with a fixed duty cycle is used to charge the bootstrap capacitor with the U phase and V phase respectively, and to charge the bootstrap capacitor with the W phase respectively.

2. The method according to claim 1, characterized in that, When a pre-charge requirement for the bootstrap capacitor is detected, the number of phases for charging the bootstrap capacitor is gradually increased, including: When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a pulse width modulation (PWM) signal is used to charge the bootstrap capacitor.

3. The method according to claim 2, characterized in that, When a pre-charging requirement for the bootstrap capacitor is detected, the method of gradually increasing the number of phases charging the bootstrap capacitor while simultaneously charging the bootstrap capacitor using a pulse width modulation (PWM) signal includes: When a pre-charging requirement for the bootstrap capacitor is detected, the number of phases charging the bootstrap capacitor is gradually increased while a PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor.

4. The method according to claim 3, characterized in that, The method of charging the bootstrap capacitor using a PWM signal with a gradually increasing duty cycle includes: The PWM signal with the duty cycle gradually increases by incrementing by Dmin% to charge the bootstrap capacitor; wherein, Dmin% is the minimum duty cycle of the PWM signal.

5. The method according to claim 4, characterized in that, The method further includes: When the duty cycle of the PWM signal reaches Dmax%, the PWM signal is stopped from increasing; where Dmax% is: the maximum duty cycle of the PWM signal, or an integer multiple of Dmin%.

6. The method according to claim 1, characterized in that, The first condition is: the charging time of the bootstrap capacitor charged by phase U reaches a first preset time. And / or, The second condition is: the charging time for charging the bootstrap capacitor with the U phase and V phase reaches a second preset time.

7. The method according to claim 1, characterized in that, The first condition is: the current charge value of the bootstrap capacitor reaches a first preset charge value; And / or, The second condition is: the current charge value of the bootstrap capacitor reaches the second preset charge value.

8. The method according to claim 1, characterized in that, The power module includes: a first bootstrap capacitor corresponding to U, a second bootstrap capacitor corresponding to V, and a third bootstrap capacitor corresponding to W. The charging of the bootstrap capacitor with phase U includes: The first bootstrap capacitor is charged through phase U; The charging of the bootstrap capacitor using the U phase and V phase includes: The first bootstrap capacitor is charged through phase U, while the second bootstrap capacitor is charged through phase V. The charging of the bootstrap capacitor using the U-phase, V-phase, and W-phase includes: The first bootstrap capacitor is charged through phase U, the second bootstrap capacitor is charged through phase V, and the third bootstrap capacitor is charged simultaneously through phase W.

9. The method according to claim 1, characterized in that, The method further includes: Once the bootstrap capacitor is fully charged or exits the pre-charge state, the bootstrap capacitor is continuously charged using a PWM signal according to its charging state.

10. A charging control device for a power module, characterized in that, Performing the method according to any one of claims 1-9, the power module comprises: at least one bootstrap capacitor; the device comprises: A detection module is used to detect the pre-charge requirement of the bootstrap capacitor; A charging module, used to gradually increase the number of phases charging the bootstrap capacitor when a pre-charging requirement of the bootstrap capacitor is detected, including: When initiating the pre-charging of the bootstrap capacitor, a first PWM signal with a gradually increasing duty cycle is used to charge the bootstrap capacitor in phase U. When the charging state of the bootstrap capacitor reaches the first condition, a second PWM signal with a fixed duty cycle is used to charge the bootstrap capacitor with the U phase and the V phase; the duty cycle of the second PWM signal is equal to the maximum duty cycle of the first PWM signal. When the charging state of the bootstrap capacitor reaches the second condition, a second PWM signal with a fixed duty cycle is used to charge the bootstrap capacitor with the U phase and V phase respectively, and to charge the bootstrap capacitor with the W phase respectively.

11. An electronic device, characterized in that, It includes a processor, a memory, and an executable program stored in the memory and executable by the processor, wherein the processor executes the steps of the charging control method of the power module as described in any one of claims 1 to 9 when executing the executable program.

12. A storage medium, characterized in that, It stores an executable program, which, when executed by a processor, implements the steps of the charging control method of the power module as described in any one of claims 1 to 9.

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