Winding power supply circuit and control method and device thereof, compressor and storage medium

Abstract

The application relates to a winding power supply circuit and a control method and device thereof, a compressor and a storage medium, which comprises the following steps: connecting the positive electrode of a power supply module to the input end of a winding power supply module; connecting the output end of the winding power supply module to the input end of a winding load; connecting the output end of the winding load to the input end of a current sampling module; connecting the output end of the current sampling module to the input end of a current limiting module; connecting the output end of the current limiting module to the negative electrode of the power supply module; connecting the first signal output end of a control module to the control end of the current limiting module, so as to control the access or bypass state of the current limiting module; connecting the second signal output end of the control module to the control end of the winding power supply module; and connecting the signal output end of the current sampling module to the signal input end of the control module, so as to feed back the sampled current signal to the control module. Therefore, the pursuit of maximum heating power in an extremely low temperature environment and the safety requirement of IPM overcurrent protection can be considered when the winding is heated, and the heating efficiency of the winding is improved.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to a winding power supply circuit and its control method, device, compressor and storage medium. Background Technology

[0002] When a compressor starts in a low-temperature environment, the viscosity of the lubricating oil increases, which can easily lead to starting difficulties or even damage to the compressor due to liquid buildup. To address this, existing technologies typically employ winding heating to preheat the compressor—by injecting current into the compressor stator windings, the resistance of the windings themselves heats the lubricating oil and refrigerant, thereby improving low-temperature starting performance. Winding heating is widely used in air conditioners, especially inverter air conditioners, due to its advantages such as eliminating the need for additional heating elements, lower cost, and more uniform heating.

[0003] In existing winding heating technologies, the heating current is typically set to a fixed value. However, winding resistance is significantly affected by temperature—the lower the ambient temperature, the lower the winding resistance. If heating is performed using a fixed current value calibrated at a certain temperature (e.g., -10℃), under extremely cold conditions (e.g., -40℃), the decrease in winding load resistance will cause the actual current to rise sharply, potentially exceeding the overcurrent protection threshold of the IPM (Intelligent Power Module), triggering IPM overcurrent protection and causing shutdown. To avoid this problem, some solutions reduce the winding heating current, but this results in insufficient heating power, failing to quickly raise the refrigerant temperature and affecting the unit's low-temperature heating capacity.

[0004] Therefore, when heating the windings with current in extremely low temperature environments, how to avoid the current surge that triggers the IPM overcurrent protection due to the decrease in winding resistance, while maintaining the maximum possible heating power to achieve rapid heating of the refrigerant, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This application provides a winding power supply circuit and its control method, device, compressor and storage medium to solve the technical problem in the prior art of how to avoid the current surge that triggers IPM overcurrent protection when heating the winding load with current in an extremely low temperature environment, while maintaining the maximum possible heating power to achieve rapid heating of the refrigerant.

[0006] In a first aspect, this application provides a winding power supply circuit, including: a power supply module, a control module, a current limiting module, a current sampling module, a winding power supply module, and a winding load; The positive terminal of the power supply module is connected to the input terminal of the winding power supply module, and the output terminal of the winding power supply module is connected to the input terminal of the winding load; the output terminal of the winding load is connected to the input terminal of the current sampling module, the output terminal of the current sampling module is connected to the input terminal of the current limiting module, and the output terminal of the current limiting module is connected to the negative terminal of the power supply module. The first signal output terminal of the control module is connected to the control terminal of the current limiting module and is used to control the access or bypass state of the current limiting module; the second signal output terminal of the control module is connected to the control terminal of the winding power supply module and is used to control the magnitude of the heating current output by the winding power supply module to the winding load. The signal output terminal of the current sampling module is connected to the signal input terminal of the control module, and is used to feed back the sampled current signal to the control module.

[0007] As an optional implementation, the current limiting module includes: a current limiting resistor, a relay, and a switching transistor; The control terminal of the switching transistor is connected to the first signal output terminal of the control module. The relay is driven by the switching transistor, and the normally open contact of the relay is connected in parallel with the current limiting resistor. When the relay is open, the current limiting resistor is connected in series to the power circuit. When the relay is closed, the current limiting resistor is bypassed by the normally open contact.

[0008] Secondly, this application provides a control method for a winding power supply circuit, applied to a control module of any of the winding power supply circuits described in the first aspect, the method comprising: When an overcurrent protection signal is detected and it is determined that the preset current limiting conditions are met, the current limiting module is connected in series to the winding power supply circuit. Determine the new heating current after connecting the current-limiting module in series, and determine the module power generated by the current-limiting module under the new heating current; The new heating current is adjusted according to the module power to obtain the target heating current; the target heating current is then supplied to the winding load.

[0009] As an optional implementation, before determining that the preset current limiting condition is met, or when determining that the preset current limiting condition is not met, the method further includes: During the process of providing the initial heating current to the winding load, if an overcurrent protection signal is detected, the historical increase state of the initial heating current is determined. Based on the historical increase status, determine the target current reduction step size for performing current reduction operation on the initial heating current; According to the target current reduction step size, a current reduction operation is performed on the initial heating current to obtain the initial target heating current, and the initial target heating current is provided to the winding load.

[0010] As an optional implementation, the method further includes: If the overcurrent protection signal is not detected, the current increase step size is determined based on the initial heating current; The initial heating current is boosted according to the boosting step size, and the current increase state value is set to a first preset value.

[0011] As an optional implementation, determining the historical increase states of the initial heating current includes: If the current increase state value is determined to be a first preset value, the historical increase state of the initial heating current is determined to be an initial heating current increase. If the current increase state value is determined to be the second preset value, the historical increase state of the initial heating current is determined to be that the initial heating current has not increased; the first preset value is different from the second preset value; When the historical increase state characterizes an increase in the initial heating current, after determining the target current reduction step size for performing a current reduction operation on the initial heating current, the method further includes: The current increase state value is updated from the first preset value to the second preset value.

[0012] As an optional implementation, determining the target current reduction step size for performing the current reduction operation on the initial heating current based on the historical increase state includes: Obtain the adjustment ratio corresponding to the historical increase state, and the maximum number of adjustments to perform the current reduction operation; Based on the adjustment ratio and the maximum number of adjustments, the initial heating current is preset and calculated to obtain the target current reduction step size.

[0013] As an optional implementation, the initial heating current is determined in the following way: Obtain the standard heating current supplied to the winding load under a preset standard environment; The standard heating current is determined as the initial heating current.

[0014] As an optional implementation, determining the target current reduction step size for performing the current reduction operation on the initial heating current based on the historical increase state includes: When the historical increase state characterizes an increase in the initial heating current, a first current reduction step size is determined based on the initial heating current, and the first current reduction step size is determined as the target current reduction step size; When the historical increase state indicates that the initial heating current has not increased, a second current reduction step size is determined based on the initial heating current, and the second current reduction step size is determined as the target current reduction step size; the second current reduction step size is greater than the first current reduction step size.

[0015] As an optional implementation, determining whether the preset rate limiting condition is currently met includes: Determine the number of times the current reduction operation is performed on the initial heating current according to the second current reduction step size, and the current heating current; If the current reduction number is greater than or equal to a preset number threshold, and / or the current heating current is less than a preset current limiting threshold, determine whether the power generated by the current limiting module under the current heating current is less than or equal to the rated power of the current limiting module. If it is determined that the power generated by the current limiting module under the current heating current is less than or equal to the rated power, then the current current limiting condition is currently satisfied.

[0016] As an optional implementation, before determining the new heating current after connecting the current-limiting module in series, the method further includes: Determine if an overcurrent protection signal has been detected; Upon detecting the overcurrent protection signal, a preset fault warning message is output; If the overcurrent protection signal is not detected, the step of determining the new heating current after the current limiting module is connected in series is performed.

[0017] As an optional implementation, adjusting the new heating current according to the module power to obtain the target heating current includes: Determine whether the power of the module is less than a first rated power threshold; the first rated power threshold is a first ratio of the rated power of the current-limiting module. If it is determined that the module power is less than the first rated power threshold, at least one current boosting operation is performed on the new heating current according to the fourth adjustment step size until the overcurrent protection signal is detected, and the first new heating current is obtained. According to the fifth adjustment step, a current reduction operation is performed on the first new heating current to obtain the target heating current; the fourth adjustment step is smaller than the fifth adjustment step, and both the fourth and fifth adjustment steps are based on the initial heating current provided to the winding load.

[0018] As an optional implementation, the method further includes: If it is determined that the module power is greater than the first rated power threshold and less than the second rated power threshold, the new heating current is kept unchanged; the second rated power threshold is a second ratio of the rated power of the current-limiting module, and the second ratio is greater than the first ratio; If the module power is determined to be greater than the second rated power threshold, at least one current reduction operation is performed on the new heating current according to the fifth adjustment step size to obtain the target heating current.

[0019] Thirdly, this application provides a control device for a winding power supply circuit, applied to a control module of any of the winding power supply circuits described in the first aspect, the device comprising: The module control module is used to control the current limiting module to be connected in series to the winding power supply circuit when an overcurrent protection signal is detected and it is determined that the preset current limiting conditions are met. The module power determination module is used to determine the new heating current after the current limiting module is connected in series, and to determine the module power generated by the current limiting module under the new heating current. A current adjustment module is used to adjust the new heating current according to the module power to obtain the target heating current; A current supply module is used to supply the target heating current to the winding load.

[0020] Fourthly, this application provides a compressor, including: a winding power supply circuit, a processor, a communication interface, a memory, and a communication bus; Wherein, the winding power supply circuit is any of the winding power supply circuits described in the first aspect; The processor, communication interface, and memory communicate with each other via a communication bus; the memory is used to store computer programs; the processor, when executing the computer program, implements the control method of the winding power supply circuit according to any one of claims 3-13.

[0021] Fifthly, this application provides a storage medium storing a computer program thereon, characterized in that, when the computer program is executed by a processor, it implements the control method for the winding power supply circuit described in any of the second aspects.

[0022] Compared with the prior art, the technical solution provided in this application has the following advantages: The winding power supply circuit provided in this application, by constructing a series control architecture of "real-time current monitoring - signal feedback - active adjustment - hardware protection", accurately solves the contradiction between winding heating efficiency and IPM overcurrent protection in extremely low temperature environments; specifically, the current sampling module is connected in series in the winding circuit, which can collect the actual current flowing through the winding load in real time and feed it back to the control module, ensuring that the control module obtains accurate current data, thereby providing an accurate basis for adjusting the heating current; the control module sends adjustment commands to the winding power supply module through the second signal output terminal to realize the dynamic adjustment of the heating current for active intervention at the software level, and through the first A signal output terminal controls the current limiting module to switch between bypass and series connection states. When the current limiting module is in bypass state, it does not affect the heating current output, ensuring that the heating power can be maximized to quickly heat up the refrigerant. When the current limiting module is switched to series connection state, it can introduce impedance for physical current limiting, forcibly suppressing current surges, and ensuring that the IPM module is not affected by overcurrent from the hardware level. This circuit structure provides a hardware foundation for achieving adaptive current regulation over a wide temperature range through the state switching mechanism of "normal bypass to ensure efficiency and abnormal connection to ensure safety". This allows for the pursuit of maximum heating power in extremely low temperature environments and the safety requirements of IPM overcurrent protection when heating the windings, thereby improving the heating efficiency of the windings. Attached Figure Description

[0023] 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.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0026] Figure 1 This is a schematic diagram of a winding power supply circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of another winding power supply circuit provided in an embodiment of this application; Figure 3A flowchart illustrating an embodiment of a control method for a winding power supply circuit provided in this application; Figure 4 A flowchart illustrating an embodiment of a control method for a winding power supply circuit provided in this application. Figure 5 A flowchart illustrating an embodiment of a control method for a winding power supply circuit provided in this application; Figure 6 A block diagram illustrating an embodiment of a control device for a winding power supply circuit provided in this application; Figure 7 This is a schematic diagram of the structure of a compressor provided in an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0029] To address the technical challenge of simultaneously preventing current surges that trigger IPM overcurrent protection due to reduced winding load resistance while maintaining maximum heating power for rapid refrigerant temperature rise during current heating of winding loads in extremely low-temperature environments, this application provides a winding power supply circuit. This circuit employs a series control architecture of "real-time current monitoring—signal feedback—active adjustment—hardware protection" to precisely resolve the conflict between winding load heating efficiency and IPM overcurrent protection in extremely low-temperature environments. Specifically, a current sampling module is connected in series in the winding load circuit, enabling real-time acquisition of the actual current flowing through the winding load and feedback to the control module. This ensures the control module obtains accurate current data, providing a precise basis for adjusting the heating current. The control module sends adjustment signals to the winding power supply module via a second signal output terminal. The circuit structure employs a software-level active intervention mechanism to dynamically adjust the heating current, and controls the current limiting module to switch between bypass and series connection states via the first signal output. When the current limiting module is in bypass state, it does not affect the heating current output, ensuring that the heating power can be maximized to quickly heat the refrigerant. When the current limiting module switches to series connection state, it can introduce impedance for physical current limiting, forcibly suppressing current surges and ensuring that the IPM module is not affected by overcurrent from a hardware perspective. This circuit structure provides a hardware foundation for adaptive current regulation over a wide temperature range through the state switching mechanism of "normal bypass to ensure efficiency and abnormal connection to ensure safety". This allows for the balance between maximizing heating power in extremely low temperature environments and meeting the safety requirements of IPM overcurrent protection when heating the windings, thereby improving the heating efficiency of the windings.

[0030] The winding power supply circuit provided in this application will be further explained and described below with reference to the accompanying drawings and specific embodiments. The embodiments do not constitute a limitation on the embodiments of this application.

[0031] See Figure 1 This is a schematic diagram of a winding power supply circuit provided in an embodiment of this application. Figure 1 As shown, the winding power supply circuit 100 may include: a power supply module 10, a control module 20, a current limiting module 30, a current sampling module 40, a winding power supply module 50, and a winding load 60.

[0032] The aforementioned power supply module 10 is the energy source of the winding power supply circuit 100, providing working voltage and current for the entire circuit system. It is usually composed of the DC bus voltage output after rectification and filtering of AC power supply, and can provide a stable power supply for heating the winding load 60 and various functional units such as the control module 20 and the current limiting module 30.

[0033] The aforementioned control module 20 is the control core of the winding power supply circuit 100, and is typically composed of a digital signal processor (DSP) or a microcontroller (MCU) and its peripheral circuits.

[0034] The aforementioned current limiting module 30 is a hardware protection execution unit in the winding power supply circuit 100, connected in series in the return path of the winding load current, i.e., at the output terminal O of the current sampling module 40. 40 With the negative terminal N of power module 11 11 between.

[0035] The aforementioned current sampling module 40 is a current detection unit in the winding power supply circuit 100, connected in series at the output terminal O of the winding load 60. 60 With the input terminal I of the current limiting module 30 30 Between these components, the actual current flowing through the winding load 60 is collected in real time. This module typically consists of components such as a sampling resistor, a current transformer, or a Hall current sensor, and its detection accuracy directly affects the accuracy of the control module's judgment of the current state and its regulation effect.

[0036] The winding power supply module 50 is the power output unit in the winding power supply circuit 100. Driven by the control module 20, this module converts the electrical energy provided by the power supply module 10 into a current suitable for heating the winding load 60 and outputs it to the winding load 60. According to the current adjustment command sent by the control module 20, the winding power supply module 50 can dynamically adjust the magnitude of its output heating current, thereby realizing software-level closed-loop current regulation to adapt to changes in heating power requirements under different ambient temperatures.

[0037] The aforementioned winding load 60 is a heating actuator in the winding power supply circuit 100, namely the stator winding load coil of the compressor motor. When the winding power supply module 50 injects current into it, the winding load 60 uses its own DC resistance to convert electrical energy into heat energy, heating the lubricating oil and refrigerant inside the compressor, thereby improving the compressor's starting performance in low-temperature environments. The winding load 60 serves as both an electromagnetic conversion component during normal motor operation and a heating element in this application. Its resistance decreases as the ambient temperature decreases, which is the root cause of the current surge under extremely cold conditions.

[0038] In the embodiments of this application, Figure 1 In the winding power supply circuit 100 shown, the positive terminal P of the power supply module 10 is... 10 The input terminal I of the winding power supply module 50 can be connected. 50 The output terminal O of the winding power supply module 50 50Connect the input terminal I of the winding load 60 60 The output terminal O of the winding load 60 60 Connect the input terminal I of the current sampling module 40 40 The output terminal O of the current sampling module 40 40 Connect to the input terminal I of the current limiting module 30 30 The output terminal O of the current limiting module 30 30 Connect the negative terminal N of power module 10 11 .

[0039] The first signal output terminal O of the aforementioned control module 20 201 The control terminal 301 of the current limiting module 30 is used to control the switching of the current limiting module 30 between the access state and the bypass state; the second signal output terminal O of the control module 20 202 The control terminal 501 connected to the winding power supply module 50 is used to send a current regulation command to the winding power supply module 50 to control the magnitude of the heating current it outputs to the winding load 60.

[0040] In the bypass state, the current limiting module 30 does not participate in the circuit operation and does not introduce additional impedance, ensuring that the winding load 60 can obtain the maximum heating current to achieve rapid heating. In the series connection state, the current limiting module 30 inserts its own impedance into the power circuit to forcibly limit the peak current flowing through the winding load, physically blocking the overcurrent path and preventing the IPM module from being damaged due to excessive current.

[0041] Meanwhile, the signal output terminal O of the current sampling module 40 40 Signal input terminal I connected to control module 20 20 This is used to feed back the sampled current signal to the control module 20. Therefore, the control module 20 can transmit the signal through the signal input terminal I. 20 The current signal fed back by the current sampling module 40 is received to realize real-time monitoring of the actual current of the winding load 60, providing a basis for current regulation decision-making and state switching of the current limiting module.

[0042] The winding power supply circuit provided in this application embodiment, by constructing a series control architecture of "real-time current monitoring - signal feedback - active adjustment - hardware protection," precisely resolves the contradiction between winding load heating efficiency and IPM overcurrent protection in extremely low temperature environments. Specifically, the current sampling module is connected in series in the winding load circuit, enabling it to collect the actual current flowing through the winding load in real time and feed it back to the control module, ensuring that the control module obtains accurate current data, thereby providing a precise basis for adjusting the heating current. The control module sends adjustment commands to the winding power supply module through the second signal output terminal to achieve dynamic adjustment of the heating current for active intervention at the software level, and controls the current limiting module through the first signal output terminal. The circuit switches between two states: when the current limiting module is in bypass mode, it does not affect the heating current output, ensuring that the heating power can be maximized to quickly heat up the refrigerant; when the current limiting module is switched to series connection mode, it can introduce impedance for physical current limiting, forcibly suppressing current surges, and ensuring that the IPM module is not affected by overcurrent from the hardware level. This circuit structure provides a hardware foundation for achieving adaptive current regulation over a wide temperature range through the state switching mechanism of "normal bypass to ensure efficiency and abnormal connection to ensure safety". This allows for the pursuit of maximum heating power in extremely low temperature environments and the safety requirements of IPM overcurrent protection when heating winding loads, thereby improving the heating efficiency of winding loads.

[0043] Furthermore, the aforementioned current limiting module 30 may include a current limiting resistor, a relay, and a switching transistor. Based on this, the control terminal of the aforementioned switching transistor can be connected to the first signal output terminal O of the control module 20. 201 The aforementioned relay can be driven by a switching transistor, and its normally open contact is connected in parallel with a current-limiting resistor. Based on this structure, when the relay is open, the current-limiting resistor is connected in series in the power circuit; when the relay is energized, the current-limiting resistor is bypassed by the normally open contact.

[0044] Furthermore, the aforementioned current sampling module 40 can be a current sensor, or it can be a... Figure 2 The current sampling resistor shown is used in conjunction with operational amplifier U1, but this embodiment of the application does not limit this.

[0045] To facilitate understanding of the composition and implementation principle of each module in the winding power supply circuit 100 provided in this application, the following is a brief explanation. Figure 2 The structure shown is illustrated with an example: See Figure 2 This is a schematic diagram of another winding power supply circuit provided in an embodiment of this application. Figure 2As shown, the winding power supply circuit 100 may include: an AC mains input unit, a rectifier bridge, a bus capacitor (the AC mains input unit, the rectifier bridge, and the bus capacitor together constitute the power supply module 10), a three-phase IGBT (Insulated-Gate Bipolar Transistor) inverter bridge (IGBT1~6) (the three-phase IGBT inverter bridge constitutes the winding power supply module 50), a motor load M (constituting the winding load 60), a controller (constituting the control module 20), a current limiting resistor switching branch (constituting the current limiting module 30), and a current sampling circuit (constituting the current sampling module 40).

[0046] The AC mains power is rectified by the rectifier bridge, and the bus capacitor acts as a voltage regulator and filter to provide DC bus voltage for the three-phase inverter circuit. Six IGBTs form a three-phase full-bridge inverter topology, and the output drives the motor M. The current limiting switching branch includes transistor Q1 (i.e., the switching transistor included in the current limiting module 30), relay K1 (i.e., the relay included in the current limiting module 30), and current limiting resistor (i.e., the current limiting resistor included in the current limiting module 30), which is controlled by the controller. The current sampling resistor, together with the operational amplifier U1, forms a current sampling circuit to sample the main circuit current and feed it back to the controller. The controller, as the core of the system, outputs a PWM signal to control the operation of the IGBT inverter bridge on the one hand, and outputs a level signal to control transistor Q1 to realize the connection and disconnection of the current limiting resistor on the other hand, while receiving the current feedback signal from the sampling circuit.

[0047] based on Figure 2 The winding power supply circuit shown works as follows: AC mains power is input to the rectifier bridge and converted to DC power. The bus capacitor filters and stabilizes the DC voltage, generating a stable DC bus voltage to supply the three-phase IGBT inverter circuit. The controller outputs a drive signal to control the orderly switching of the six IGBTs, inverting the DC voltage into three-phase AC power to drive the motor M. The sampling resistor collects the loop current signal, which is then conditioned and amplified by the operational amplifier U1 and sent to the controller to achieve real-time monitoring of the loop current. When the loop current is too high and current limiting is required, the controller outputs a level that turns on transistor Q1, energizes the coil of relay K1, opens the relay contacts, and connects the current-limiting resistor in series to the main circuit. The resistor increases the loop impedance and suppresses the maximum loop current. When current limiting is not required, the controller turns off Q1, the relay coil is de-energized and resets, the contacts close, and the current-limiting resistor is bypassed and no longer participates in the loop operation. The controller combines the real-time current value obtained from sampling to continuously adjust the IGBT drive waveform. In conjunction with the switching of the current-limiting resistor branch, it realizes closed-loop current control during motor operation. Under extreme conditions, it relies on the current-limiting resistor to achieve hardware current-limiting protection to prevent the loop current from exceeding the tolerance range of the power devices.

[0048] based on Figure 1 or Figure 2 The present application provides a control method for the winding power supply circuit to control the winding power supply circuit to provide current to the winding load, thereby realizing current heating of the winding load.

[0049] The control method of the winding power supply circuit provided in this application will be further explained below with reference to the accompanying drawings and specific embodiments. The embodiments do not constitute a limitation on the embodiments of this application.

[0050] See Figure 3 This is a flowchart illustrating an embodiment of a control method for a winding power supply circuit provided in this application. As one embodiment, Figure 3 The process shown can be applied to Figure 1 or Figure 2 Any of the winding power supply circuits shown. For example... Figure 3 As shown, the process may include the following steps: Step 301: When an overcurrent protection signal is detected and it is determined that the preset current limiting conditions are met, the current limiting module is connected in series to the winding power supply circuit.

[0051] The aforementioned overcurrent protection signal refers to a fault trigger signal generated by the IPM module or control module when the control module detects that the actual current of the winding load exceeds the preset safety threshold of the IPM through the current sampling module. This signal is used to indicate that the current state is in danger of overcurrent.

[0052] The aforementioned current limiting conditions refer to the preset judgment criteria used by the control module to determine whether to switch the current limiting module from bypass to series connection. These criteria may include, but are not limited to: the number of current reductions reaching or exceeding a preset threshold, and the power generated by the current heating current on the current limiting module not exceeding its rated power, and / or, the current heating current being lower than a preset current limiting threshold, and the power generated by the current heating current on the current limiting module not exceeding its rated power.

[0053] The aforementioned current limiting module refers to a hardware protection unit consisting of a current limiting resistor and a controllable switching circuit, which is connected in series in the winding load current loop. It is driven by the control module to switch between bypass state and series connection state, so as to introduce impedance for physical current limiting when needed.

[0054] The aforementioned series connection refers to the working state in which the controllable switching circuit in the current limiting module switches from the on state to the off state, so that the current limiting resistor is connected in series in the winding load power supply current loop, thereby physically limiting the loop current.

[0055] The above-mentioned winding power supply circuit refers to Figure 1 or Figure 2The complete electrical circuit shown consists of a power supply module, a control module, a current limiting module, a current sampling module, a winding power supply module, and a winding load, and is used to provide controlled heating current to the winding load.

[0056] In this embodiment of the application, the execution subject may be the control module of the winding power supply circuit.

[0057] In this step, if the execution subject of this application embodiment detects an overcurrent protection signal during the process of the winding power supply circuit supplying power to the winding load, it indicates that the current supplied to the winding load is too large. Therefore, in order to prevent the triggering of IPM overcurrent protection, the execution subject of this application embodiment can determine whether the preset current limiting condition is met.

[0058] In one embodiment, when the executing entity of this application determines that the preset current limiting conditions are met, it can control the current limiting module to be connected in series to the winding power supply circuit so as to limit the current supplied to the winding load from the hardware level, thereby preventing the current supplied to the winding load from being too large.

[0059] In another embodiment, when the executing entity of this application determines that the preset current limiting condition is not met, it can directly reduce the current supplied to the winding load. This can be specifically described below. Figure 4 The process shown will be described in detail here.

[0060] In one embodiment, when the execution subject of this application detects an overcurrent protection signal for the first time, it can first reduce the heating current currently supplied to the winding load. For details, please refer to... Figure 4 The process is shown below. Based on this, when determining whether the preset current limiting condition is met, the number of times the current is reduced during the current reduction operation for the heating current, as well as the current heating current, can be obtained.

[0061] Then, based on the above-mentioned number of current reductions and the current heating current, it can be determined whether the initial current limiting condition is met.

[0062] As an optional implementation, it can be determined whether the number of rate reduction attempts is greater than or equal to a preset threshold. Optionally, if the number of rate reduction attempts is greater than or equal to the threshold, then it is determined that the initial rate limiting condition is met.

[0063] As an alternative implementation, it can be determined whether the current heating current is less than or equal to a preset current limiting threshold. Optionally, if the current heating current is less than or equal to the current limiting threshold, it is determined that the initial current limiting condition is met. The current limiting threshold can be a preset proportion of the IPM's rated current, such as one-tenth.

[0064] As another optional implementation, it can be determined whether the aforementioned number of current reductions is greater than or equal to a preset number threshold, and whether the current heating current is less than or equal to a preset current limiting threshold. Optionally, if it is determined that the aforementioned number of current reductions is greater than or equal to the number threshold, and the current heating current is less than or equal to the current limiting threshold, it can be determined that the initial current limiting condition is met.

[0065] Finally, if it is determined that the initial current limiting condition is met, then it is determined whether the power generated by the current limiting module under the current heating current is less than or equal to the rated power of the current limiting module. If it is determined that the power generated by the current limiting module under the current heating current is less than or equal to the rated power, then it is determined that the preset current limiting condition is met.

[0066] In one embodiment, the current limiting module may include a current limiting resistor, a relay, and a switching transistor. The control terminal of the switching transistor is connected to the first signal output terminal of the control module. The relay can be driven by the switching transistor. The normally open contact of the relay is connected in parallel with the current limiting resistor. When the relay is open, the current limiting resistor can be connected in series to the power circuit. When the relay is energized, the current limiting resistor can be bypassed by the normally open contact.

[0067] Based on this, when the executing entity of this application controls the current limiting module to be connected in series to the winding power supply circuit, it can control the above-mentioned relay to be disconnected so that the current limiting resistor can be connected in series to the power circuit of the winding power supply circuit.

[0068] Step 302: Determine the new heating current after connecting the current limiting module in series, and determine the module power generated by the current limiting module under the new heating current.

[0069] Step 303: Adjust the new heating current according to the above module power to obtain the target heating current.

[0070] Step 304: Provide the target heating current to the winding load.

[0071] The following provides a unified explanation of steps 302 to 304: The aforementioned new heating current refers to the actual operating current value flowing through the winding load after the current limiting module is connected in series to the winding power supply circuit, which is obtained by resampling by the current sampling module.

[0072] The module power mentioned above refers to the actual heating power generated by the current-limiting resistor in the current-limiting module when a new heating current passes through it.

[0073] The aforementioned target heating current refers to the safest and largest possible heating current value that the control module ultimately determines, under the current operating conditions, by performing current boosting, current maintenance, or current reduction operations based on the module power.

[0074] In this step, after the executing entity of this application connects the current-limiting module in series to the winding power supply circuit, in order to output a safe and as large a heating current as possible to the winding load, thereby improving the current heating efficiency of the winding load, it can determine the new heating current after connecting the current-limiting module in series, and determine the module power generated by the current-limiting module under the new heating current. Then, based on the module power, the new heating current can be adjusted to obtain a safe and efficient target heating current, and the target heating current can be provided to the winding load.

[0075] In one embodiment, the executing entity of this application embodiment can collect the new heating current after the series current limiting module through the current sampling module in the winding power supply circuit.

[0076] In one embodiment, after the executing entity of this application receives the new heating current, it can determine the module power generated by the current-limiting module under the new heating current using the following formula (a): Formula (1) Among them, the above For module power, the above For the new heating current, the above This is the resistance value of the current-limiting module.

[0077] In addition, in one embodiment, in order to eliminate the fault of the hardware itself, after the execution subject of this application embodiment controls the current limiting module to be connected in series to the winding power supply circuit, it can first determine whether an overcurrent protection signal is detected before determining the new heating current after the series current limiting module is connected in series.

[0078] Optionally, if an overcurrent protection signal is detected, it indicates that there is a fault in the IPM itself or a fault in the peripheral circuit. Therefore, a preset fault warning message can be output.

[0079] Optionally, if no overcurrent protection signal is detected, it indicates that there is no fault at this time, and therefore, the step of determining the new heating current after the series current limiting module can continue.

[0080] In one embodiment, when the executing entity of this application adjusts the new heating current according to the module power, it can compare the module power with a first rated power threshold and a second rated power threshold, and adjust the new heating current according to the comparison result. The first rated power threshold is a first ratio of the rated power of the current-limiting module, that is, the first rated power threshold is the product of the rated power of the current-limiting module and the first ratio. The second rated power threshold is a second ratio of the rated power of the current-limiting module, that is, the second rated power threshold is the product of the rated power of the current-limiting module and the second ratio. The second ratio is greater than the first ratio, for example, the second ratio is 0.9 and the first ratio is 0.7.

[0081] As an optional implementation, it can be first determined whether the module power is less than the first rated power threshold. If it is determined that the module power is less than the first rated power threshold, at least one current boosting operation is performed on the new heating current according to the fourth adjustment step size until an overcurrent protection signal is detected, and the first new heating current is obtained.

[0082] Then, according to the fifth adjustment step, a current reduction operation can be performed on the first new heating current to obtain the target heating current. The fourth adjustment step is smaller than the fifth adjustment step, and both the fourth and fifth adjustment steps are based on the initial heating current provided to the winding load. This initial heating current can be the heating current provided to the winding load under normal low temperature conditions.

[0083] As another alternative implementation, if the module power is determined to be greater than the first rated power threshold and less than the second rated power threshold, it indicates that the new heating current is relatively safe and efficient for the winding load. Therefore, the new heating current can be kept constant.

[0084] As another alternative implementation, if the module power is determined to be greater than the second rated power threshold, it indicates that the new heating current may trigger an overcurrent protection signal. Therefore, at least one current reduction operation can be performed on the new heating current according to the fifth adjustment step to obtain the target heating current.

[0085] In one embodiment, the execution subject of this application embodiment can be a control module. Based on this, after determining the target heating current, the control module can send a current adjustment command to the winding power supply module through the second signal output terminal, driving the winding power supply module to output the target heating current to the winding load. The winding load uses its own DC resistance to convert electrical energy into heat energy to heat the lubricating oil and refrigerant inside the compressor.

[0086] The technical solution provided in this application embodiment controls the current limiting module to be connected in series to the winding power supply circuit when an overcurrent protection signal is detected and it is determined that the current limiting condition is currently met. The new heating current after the current limiting module is connected in series is determined, and the module power generated by the current limiting module under the new heating current is determined. Based on the module power, the new heating current is adjusted to obtain the target heating current and the target heating current is provided to the winding load. This technical solution, by switching the current-limiting module from bypass to series connection after the software adaptive adjustment fails, forcibly introduces impedance at the physical level to clamp the current peak, providing the system with a final safety barrier that surpasses software closed-loop regulation. On this basis, the new heating current after the series current-limiting module is determined and the actual heating power of the current-limiting resistor is calculated in real time. The new heating current is finely adjusted according to the power level, realizing refined power management under the hardware current-limiting platform. This ensures the absolute safety of the IPM module under extreme conditions, while maintaining the heating power to the maximum extent within the safety boundary to ensure rapid refrigerant heating. Thus, it systematically solves the technical problem of the incompatibility between "efficiency" and "safety" in winding heating under extremely cold environments.

[0087] See Figure 4 This is a flowchart illustrating an embodiment of a control method for a winding power supply circuit provided in this application. Figure 4 The process shown is in Figure 3 Based on the illustrated process, this paper describes how the heating current of the winding load is adjusted via software if an overcurrent protection signal is detected, either before the preset current limiting condition is met, or when the preset current limiting condition is not met. Figure 4 As shown, the process may include the following steps: Step 401: During the process of providing the initial heating current to the winding load, if an overcurrent protection signal is detected, determine the historical increase status of the initial heating current.

[0088] The aforementioned initial heating current refers to the initial heating current value output by the control module to the winding power supply module when the winding load heating function is started. It is usually the reference current calibrated under normal low temperature conditions.

[0089] The aforementioned overcurrent protection signal refers to a fault trigger signal generated by the IPM module or control module when the actual winding load current fed back by the current sampling module exceeds the preset safe current threshold of the IPM module. This signal is used to indicate that the current state is in an overcurrent danger state.

[0090] The aforementioned historical increase status refers to the number of current-increasing operations or the cumulative total current increase performed by the control module within the current adjustment cycle. It is used to quantify the total increase in heating current from its initial value or the lowest value after the previous current-reducing operation to the current overcurrent trigger. It is a record of the adjustment history of "how far it has approached the target through small-step current increases".

[0091] In this step, when initially providing heating current to the winding load, in order to provide a relatively standard heating current to the winding load, the executing entity of this application embodiment can first determine the initial heating current to be provided to the winding load, and then provide the initial heating current to the winding load. During this process, if an overcurrent protection signal is detected, the historical increase state of the current initial heating current is determined.

[0092] In one embodiment, the executing entity of this application can obtain a standard heating current provided to the winding load under a preset standard environment, and determine the standard heating current as the initial heating current. The preset standard environment can be a pre-set conventional low-temperature environment, such as -10°C.

[0093] In one embodiment, if no overcurrent protection signal is detected during the process of providing initial heating current to the winding load, the executing entity of this application can determine the current increase step size based on the initial heating current in order to improve the current heating efficiency of the winding load, and perform a current increase operation on the initial heating current according to the current increase step size. Then, the current increase state value can be set to a first preset value, such as 1.

[0094] As an optional implementation, a pre-set threshold for the number of current reductions is obtained, and this threshold is multiplied by a first threshold factor (e.g., 4) to obtain the first threshold. Then, the initial heating current can be divided by the first threshold to obtain the current increase step size.

[0095] Based on this, when determining the historical increase state of the initial heating current, if the current increase state value is determined to be a first preset value (e.g., 1), the historical increase state of the initial heating current can be determined to be an increase in the initial heating current; if the current increase state value is determined to be a second preset value (e.g., 0), the historical increase state of the initial heating current can be determined to be no increase in the initial heating current. The first preset value and the second preset value are different.

[0096] Based on this, if the historical increase state indicates an increase in the initial heating current, after executing steps 402 and 403, the current increase state value can be updated from the first preset value to the second preset value.

[0097] Furthermore, the aforementioned historical increase states also include the increase in flow step size.

[0098] Step 402: Based on the above historical increase status, determine the target current reduction step size for performing current reduction operation on the initial heating current.

[0099] The aforementioned target current reduction step size refers to the specific current reduction magnitude that the control module calculates based on historical increase states, indicating the current reduction operation that needs to be performed at present. This step size is positively correlated with historical increase states—the larger the historical increase (i.e., the more small steps are accumulated), the larger the reduction magnitude, ensuring that the current reduction returns to within the safety margin in one operation.

[0100] In this step, after determining the historical increase state, the execution subject of this application embodiment can determine the target current reduction step size for performing current reduction operation on the initial heating current based on the aforementioned historical increase state.

[0101] In one embodiment, the executing entity of this application can obtain the adjustment ratio corresponding to the aforementioned historical increase state, as well as the maximum number of adjustments to perform the current reduction operation. Then, based on the aforementioned adjustment ratio and the maximum number of adjustments, a preset calculation can be performed on the initial heating current to obtain the target current reduction step size.

[0102] As an optional implementation, the historical increase state includes an initial heating current increase state and an initial heating current no increase state. The initial heating current increase state corresponds to a first adjustment ratio, and the initial heating current no increase state corresponds to a second adjustment ratio, wherein the first adjustment ratio is less than the second adjustment ratio.

[0103] As an exemplary implementation, the target current reduction step size can be obtained by performing the preset calculation shown in Equation (ii) on the above-mentioned adjustment ratio, maximum number of adjustments, and initial heating current: Formula (II) The above To reduce the target flow step size, the above For the initial heating current, the above To adjust the ratio, the above This represents the maximum number of adjustments.

[0104] It should be noted that when the historical increase state is an increase in the initial heating current, the above-mentioned target current reduction step size can be greater than the current increase step size of the historical time for increasing the initial heating current.

[0105] In another embodiment, the execution subject of this application embodiment can determine the target current reduction step size for performing the current reduction operation based on the historical increase state and the initial heating current.

[0106] As an alternative implementation, when the historical increase state characterizes an increase in the initial heating current, the first current reduction step size can be determined based on the initial heating current, and the first current reduction step size can be determined as the target current reduction step size.

[0107] As an alternative implementation, if the historical increase in state indicates that the initial heating current has not increased, the second current reduction step size can be determined based on the initial heating current, and this second current reduction step size can be set as the target current reduction step size. The second current reduction step size is larger than the first current reduction step size.

[0108] As an exemplary implementation, the executing entity of this application embodiment can obtain the adjustment ratio corresponding to the aforementioned historical increase state, as well as the maximum number of adjustments to perform the current reduction operation. Then, based on the aforementioned adjustment ratio and the maximum number of adjustments, a preset calculation can be performed on the initial heating current to obtain the target current reduction step size.

[0109] In one implementation, the state of increased initial heating current corresponds to a first adjustment ratio, and the state of no increase in initial heating current corresponds to a second adjustment ratio, wherein the first adjustment ratio is less than the second adjustment ratio.

[0110] Optionally, the above adjustment ratio, maximum number of adjustments, and initial heating current can be preset and calculated as shown in Equation (II) to obtain the target current reduction step size.

[0111] In another embodiment, the aforementioned historical increase states include whether the initial heating current has increased, and the specific amount of increase. Based on this, when determining the target current reduction step size for performing a current reduction operation on the initial heating current according to the historical increase states, it can be determined whether the historical increase states characterize an increase in the initial heating current.

[0112] As an optional implementation, if the historical increase state indicates an increase in the initial heating current, and the increase is a first increase, then a preset third current reduction step size greater than the first increase size is determined as the target current reduction step size.

[0113] As an alternative implementation, if the historical increase in state indicates that the initial heating current has not increased, then a preset fourth current reduction step size can be determined as the target current reduction step size. Optionally, the third current reduction step size can be smaller than the fourth current reduction step size.

[0114] Based on the above embodiments, when determining whether the preset current limiting condition is met in step 301, the number of times the current reduction operation is performed on the initial heating current according to the second current reduction step size (or the fourth current reduction step size, that is, when the initial heating current is increased in the historical increase state), and the current heating current can be determined.

[0115] Optionally, if the number of current reduction cycles is greater than or equal to a preset threshold, and / or the current heating current is less than a preset current limiting threshold, it can be determined whether the power generated by the current limiting module under the current heating current is less than or equal to the rated power of the current limiting module. Then, if it is determined that the power generated by the current limiting module under the current heating current is less than or equal to the aforementioned rated power, it is determined that the preset current limiting condition is met. The aforementioned current limiting threshold can be a preset proportion of the IPM rated current, for example, one-tenth.

[0116] Step 403: According to the target current reduction step size mentioned above, perform a current reduction operation on the initial heating current to obtain the initial target heating current, and provide the initial target heating current to the winding load.

[0117] Current reduction operation refers to the action of the control module sending a current reduction command to the winding power supply module, so that the output heating current is reduced according to the target current reduction step size, which is used to quickly pull the current under the overcurrent state back to the safe area.

[0118] In this step, after determining the target current reduction step size, the execution entity of this application embodiment can perform a current reduction operation on the initial heating current to obtain the initial target heating current. Then, this initial target heating current can be provided to the winding load.

[0119] The technical solution provided in this application, during the process of providing initial heating current to the winding load, determines the historical increase state of the initial heating current when an overcurrent protection signal is detected. Based on the historical increase state, it determines the target current reduction step size for performing current reduction operation on the initial heating current. Based on the target current reduction step size, it performs current reduction operation on the initial heating current to obtain the initial target heating current, and then provides the initial target heating current to the winding load. This technical solution, by introducing the historical increase state as the decision basis for the current reduction magnitude, achieves a leapfrog optimization from "fixed step current reduction" to "dynamic adaptive current reduction"—when an overcurrent is triggered, the control module does not mechanically use a preset fixed step size for current reduction, but rather backtracks to the total amount accumulated through small step current increases, and determines the target current reduction step size based on the principle of "the more it increases, the greater the current reduction," thereby ensuring that the current reduction returns to within the safety margin in one operation. This avoids inefficient oscillations caused by repeated overcurrent and repeated current reduction due to insufficient fixed current reduction, and also avoids excessive reduction of heating power due to excessive fixed current reduction, which would affect the refrigerant heating rate. Meanwhile, the control module does not need to pre-set multiple fixed step size parameters, nor does it need to rely on a large number of experimental calibrations. It can autonomously determine the current reduction range based solely on historical state data generated during the actual adjustment process. This simplifies the configuration of control parameters and enables adaptive matching of appropriate current reduction strategies under different ambient temperatures, different machine models, and different operating conditions. This allows for an intelligent decision-making mechanism that dynamically determines the current reduction step size based on historical states. Under the premise of ensuring that the risk of overcurrent can be eliminated with a single current reduction, the heating power gain previously obtained through small-step current increase is preserved to the maximum extent. This achieves the optimal synergy between overcurrent response speed, system safety, and heating efficiency.

[0120] See Figure 5 This is a flowchart illustrating an embodiment of a control method for a winding power supply circuit provided in this application. Figure 5 The process shown is in Figure 1 or Figure 2 Based on the structure shown, the specific method for controlling the winding load supply current is described. For example... Figure 5 As shown, the process may include: 1. Reference Calibration: By using the winding load heating current Ibase, which is confirmed under mild and low temperature conditions, as an initial reference, we can avoid starting from scratch and shorten the winding load heating time. 2. Adaptive: Heating is performed at the current operating temperature, using Ibase as the initial reference value.

[0121] If an IPM overcurrent protection signal is detected, a current reduction operation is performed: the current is reduced by ΔI1, where ΔI1 = Ibase / 2Nmax. After clearing the fault, the winding load heating continues.

[0122] If no overcurrent protection signal is detected, a current increase operation is performed: the winding load heating current increases by ΔI2 each time, ΔI2=Ibase / 4Nmax; until the IPM overcurrent protection signal is detected again, a final current decrease operation is performed: the current decreases by ΔI3, where ΔI3=Ibase / 3Nmax. The final step of decreasing ΔI3 (ΔI3>ΔI2) ensures a safety margin, prevents false IPM protection alarms, and sets the current winding load heating current to the target heating current at the current temperature.

[0123] 3. Hardware backup: If the number of current drops exceeds the threshold Nmax or the winding load heating current is lower than the preset lower limit Imin, Imin = IPM rated current / 10, and the power verification is satisfied: Rlim's rated power must meet the requirement that rated Rlim power ≥ Imin. 2 If ×Rlim is reached, hardware impedance switching is executed: the DSP sends a high level to transistor Q1, driving relay K1 to charge the excitation winding load, the normally closed switch opens, and the current-limiting resistor Rlim is connected in series in the circuit. After heating is complete and the winding load heating is removed, the DSP sends a low level to transistor Q1, immediately disconnecting the current-limiting resistor Rlim. If the power verification is not met, it is directly determined that there is a fault in the IPM itself or a fault in the peripheral circuit.

[0124] Adaptive winding load heating is performed again after Rlim is connected in series; If the overcurrent protection is still triggered, it is determined to be a fault in the IPM itself or a fault in the peripheral circuit. If overcurrent protection is not triggered, the DSP first calculates the power of the current-limiting resistor Rlim based on the sampled current. If the calculated I... 2 If ×Rlim < 0.7 of the rated Rlim power, then the following procedure will be executed: Re-execute the adaptive step (gradually increasing the current in small steps ΔI2) until overcurrent protection is triggered again, then reduce the current ΔI3 to confirm the final winding load heating current. If the calculated PRlim power > 0.7 of the rated Rlim power and < 0.9 of the rated Rlim power, maintain the current winding load heating current. If the calculated PRlim power > 0.9 of the rated Rlim power, directly reduce the winding load heating current ΔI3, and then perform a power judgment.

[0125] The technical solution provided in this application embodiment dynamically changes the maximum current of the winding load heating in extremely cold environments by adaptively increasing or decreasing the heating current of the winding load with variable step size, combined with the hardware fallback mechanism of the relay series current limiting resistor. This reduces the probability of IPM overcurrent protection during the heating process of the winding load in extremely low temperature environments, while ensuring rapid heating of the refrigerant.

[0126] See Figure 6 This is a block diagram illustrating an embodiment of a control device for a winding power supply circuit provided in this application. As one embodiment, this device can be applied to... Figure 1 or Figure 2 A power supply circuit for any winding. For example... Figure 6 As shown, the device may include: The module control module 61 is used to control the current limiting module to be connected in series to the winding power supply circuit when an overcurrent protection signal is detected and it is determined that the current current limiting condition is met. The module power determination module 62 is used to determine the new heating current after the current limiting module is connected in series, and to determine the module power generated by the current limiting module under the new heating current. The current adjustment module 63 is used to adjust the new heating current according to the module power to obtain the target heating current; The current supply module 64 is used to supply the target heating current to the winding load.

[0127] like Figure 7 The diagram shown is a schematic representation of a compressor according to an embodiment of this application. It includes a processor 71, a communication interface 72, a memory 73, a communication bus 74, and a winding power supply circuit 100. The processor 71, communication interface 72, and memory 73 communicate with each other via the communication bus 74. Memory 73 is used to store computer programs; Winding power supply circuit 100, is Figure 1 or Figure 2 The winding power supply circuit 100 is described above.

[0128] In one embodiment of this application, when the processor 71 executes the program stored in the memory 73, it implements the control method for the winding power supply circuit provided in any of the foregoing method embodiments, including: When an overcurrent protection signal is detected and it is determined that the preset current limiting conditions are met, the current limiting module is connected in series to the winding power supply circuit. Determine the new heating current after connecting the current-limiting module in series, and determine the module power generated by the current-limiting module under the new heating current; The new heating current is adjusted according to the module power to obtain the target heating current; the target heating current is then supplied to the winding load.

[0129] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for the winding power supply circuit provided in any of the foregoing method embodiments.

[0130] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0131] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0132] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0133] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A winding power supply circuit, characterized in that, include: Power supply module, control module, current limiting module, current sampling module, winding power supply module, winding load; The positive terminal of the power supply module is connected to the input terminal of the winding power supply module, and the output terminal of the winding power supply module is connected to the input terminal of the winding load; the output terminal of the winding load is connected to the input terminal of the current sampling module, the output terminal of the current sampling module is connected to the input terminal of the current limiting module, and the output terminal of the current limiting module is connected to the negative terminal of the power supply module. The first signal output terminal of the control module is connected to the control terminal of the current limiting module and is used to control the access or bypass state of the current limiting module; the second signal output terminal of the control module is connected to the control terminal of the winding power supply module and is used to control the magnitude of the heating current output by the winding power supply module to the winding load. The signal output terminal of the current sampling module is connected to the signal input terminal of the control module, and is used to feed back the sampled current signal to the control module.

2. The winding power supply circuit according to claim 1, characterized in that, The current limiting module includes: a current limiting resistor, a relay, and a switching transistor; The control terminal of the switching transistor is connected to the first signal output terminal of the control module. The relay is driven by the switching transistor, and the normally open contact of the relay is connected in parallel with the current limiting resistor. When the relay is open, the current limiting resistor is connected in series to the power circuit. When the relay is closed, the current limiting resistor is bypassed by the normally open contact.

3. A control method for a winding power supply circuit, characterized in that, The method, applied to the control module of the winding power supply circuit according to any one of claims 1 to 2, comprises: When an overcurrent protection signal is detected and it is determined that the preset current limiting conditions are met, the current limiting module is connected in series to the winding power supply circuit. Determine the new heating current after connecting the current-limiting module in series, and determine the module power generated by the current-limiting module under the new heating current; The new heating current is adjusted according to the module power to obtain the target heating current; the target heating current is then supplied to the winding load.

4. The method according to claim 3, characterized in that, Before determining that the preset current limiting condition is met, or when determining that the preset current limiting condition is not met, the method further includes: During the process of providing the initial heating current to the winding load, if an overcurrent protection signal is detected, the historical increase state of the initial heating current is determined. Based on the historical increase status, determine the target current reduction step size for performing current reduction operation on the initial heating current; According to the target current reduction step size, a current reduction operation is performed on the initial heating current to obtain the initial target heating current, and the initial target heating current is provided to the winding load.

5. The method according to claim 4, characterized in that, The method further includes: If the overcurrent protection signal is not detected, the current increase step size is determined based on the initial heating current; The initial heating current is boosted according to the boosting step size, and the current increase state value is set to a first preset value.

6. The method according to claim 5, characterized in that, The determination of the historical increase states of the initial heating current includes: If the current increase state value is determined to be a first preset value, the historical increase state of the initial heating current is determined to be an initial heating current increase. If the current increase state value is determined to be the second preset value, the historical increase state of the initial heating current is determined to be that the initial heating current has not increased; the first preset value is different from the second preset value; When the historical increase state characterizes an increase in the initial heating current, after determining the target current reduction step size for performing a current reduction operation on the initial heating current, the method further includes: The current increase state value is updated from the first preset value to the second preset value.

7. The method according to claim 4, characterized in that, Determining the target current reduction step size for performing current reduction operation on the initial heating current based on the historical increase state includes: Obtain the adjustment ratio corresponding to the historical increase state, and the maximum number of adjustments to perform the current reduction operation; Based on the adjustment ratio and the maximum number of adjustments, the initial heating current is preset and calculated to obtain the target current reduction step size.

8. The method according to claim 4, characterized in that, The initial heating current is determined in the following manner: Obtain the standard heating current supplied to the winding load under a preset standard environment; The standard heating current is determined as the initial heating current.

9. The method according to claim 4, characterized in that, Determining the target current reduction step size for performing current reduction operation on the initial heating current based on the historical increase state includes: When the historical increase state characterizes an increase in the initial heating current, a first current reduction step size is determined based on the initial heating current, and the first current reduction step size is determined as the target current reduction step size; When the historical increase state indicates that the initial heating current has not increased, a second current reduction step size is determined based on the initial heating current, and the second current reduction step size is determined as the target current reduction step size; the second current reduction step size is greater than the first current reduction step size.

10. The method according to claim 9, characterized in that, The process of determining whether the preset rate limiting conditions are met includes: Determine the number of times the current reduction operation is performed on the initial heating current according to the second current reduction step size, and the current heating current; If the current reduction number is greater than or equal to a preset number threshold, and / or the current heating current is less than a preset current limiting threshold, determine whether the power generated by the current limiting module under the current heating current is less than or equal to the rated power of the current limiting module. If it is determined that the power generated by the current limiting module under the current heating current is less than or equal to the rated power, then the current current limiting condition is currently satisfied.

11. The method according to claim 3, characterized in that, Before determining the new heating current after connecting the current-limiting module in series, the method further includes: Determine if an overcurrent protection signal has been detected; Upon detecting the overcurrent protection signal, a preset fault warning message is output; If the overcurrent protection signal is not detected, the step of determining the new heating current after the current limiting module is connected in series is performed.

12. The method according to claim 3 or 11, characterized in that, The step of adjusting the new heating current according to the module power to obtain the target heating current includes: Determine whether the power of the module is less than a first rated power threshold; the first rated power threshold is a first ratio of the rated power of the current-limiting module. If it is determined that the module power is less than the first rated power threshold, at least one current boosting operation is performed on the new heating current according to the fourth adjustment step size until the overcurrent protection signal is detected, and the first new heating current is obtained. According to the fifth adjustment step, a current reduction operation is performed on the first new heating current to obtain the target heating current; the fourth adjustment step is smaller than the fifth adjustment step, and both the fourth and fifth adjustment steps are based on the initial heating current provided to the winding load.

13. The method according to claim 12, characterized in that, The method further includes: If it is determined that the module power is greater than the first rated power threshold and less than the second rated power threshold, the new heating current is kept unchanged; the second rated power threshold is a second ratio of the rated power of the current-limiting module, and the second ratio is greater than the first ratio; If the module power is determined to be greater than the second rated power threshold, at least one current reduction operation is performed on the new heating current according to the fifth adjustment step size to obtain the target heating current.

14. A control device for a winding power supply circuit, characterized in that, The control module applied to the winding power supply circuit of any one of claims 1 to 2, the device comprising: The module control module is used to control the current limiting module to be connected in series to the winding power supply circuit when an overcurrent protection signal is detected and it is determined that the preset current limiting conditions are met. The module power determination module is used to determine the new heating current after the current limiting module is connected in series, and to determine the module power generated by the current limiting module under the new heating current. A current adjustment module is used to adjust the new heating current according to the module power to obtain the target heating current; A current supply module is used to supply the target heating current to the winding load.

15. A compressor, characterized in that, include: Winding power supply circuit, processor, communication interface, memory, and communication bus; Wherein, the winding power supply circuit is the winding power supply circuit according to any one of claims 1 to 2; The processor, communication interface, and memory communicate with each other via a communication bus; the memory is used to store computer programs; the processor, when executing the computer program, implements the control method of the winding power supply circuit according to any one of claims 3-13.

16. A storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the control method for the winding power supply circuit according to any one of claims 3-13.

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