Electric power energy recovery method, energy recovery control method, energy recovery system, and storage medium

Abstract

The embodiment of the present application relates to the technical field of energy recovery, in particular to an electric energy recovery method, an energy recovery control method, an energy recovery system and a storage medium, wherein the embodiment of the present application enables the heating film to absorb inductive storage energy, and the heating film can be used to heat the battery, so that the inductive storage energy is not wasted, the energy utilization rate is improved, and the embodiment of the present application does not need to additionally design a transformer to recover the inductive storage energy, the existing heating film of the energy recovery system is used to absorb the inductive storage energy, so that the system size is not increased, and the system cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of energy recovery technology, and in particular to an inductive energy recovery method, an energy recovery control method, an energy recovery system, and a storage medium. Background Technology

[0002] In a truck engine charging system, a high-power generator charges the battery pack via a charging MOSFET. The charging system includes the generator, charging MOSFET, inductor, and battery. Due to the presence of distributed inductance and cable inductance in the charging circuit, when the charging process is suddenly interrupted (such as when the charging MOSFET turns off, the fuse blows, or a circuit fault occurs), a very high back electromotive force will be induced, based on the characteristic that inductor current cannot change abruptly.

[0003] In related technologies, an RC snubber circuit or TVS diode is connected in parallel between the drain and source of the charging MOSFET. The RC snubber circuit or TVS diode dissipates the energy of the distributed inductance and cable inductance as heat. Traditional RC snubber circuits and TVS diodes simply dissipate the induced energy as heat, failing to effectively utilize the inductor energy and easily causing excessive heat generation. Furthermore, some related technologies utilize the polarity energy of a transformer to recover inductor energy, but transformers can easily increase the system size. Summary of the Invention

[0004] In view of this, one objective of the embodiments of the present invention is to provide an inductor energy recovery method, an energy recovery control method, an energy recovery system, and a storage medium to improve the low inductor energy utilization rate and the increased system volume caused by energy recovery in the related art.

[0005] In a first aspect, embodiments of the present invention provide an inductive energy recovery method applied to an energy recovery system. The energy recovery system includes a charging circuit and an energy absorption circuit. The charging circuit is used to charge a battery and a first switching transistor controls the switching of the battery's charging circuit. The energy absorption circuit includes a heating film attached to the battery and a second switching transistor connecting the heating film and the charging circuit. The method includes: determining the inductively stored energy of the target inductor when the battery stops charging, based on a target inductance and a target current, wherein the target inductance is the equivalent inductance on the charging circuit when the battery stops charging, and the target current is the instantaneous charging current of the charging circuit at the moment the first switching transistor is pre-turned off; determining the energy absorption time of the second switching transistor based on the inductively stored energy, the energy conversion efficiency of the energy recovery system, and a time adjustment term, wherein the time adjustment term characterizes the influence of the actual temperature of the heating film on the energy absorption time; determining the absorbable energy of the heating film per unit time based on the inductively stored energy, the energy conversion efficiency, and the energy absorption time; and determining the duty cycle of the PWM signal controlling the second switching transistor of the energy absorption circuit based on the absorbable energy.

[0006] In some embodiments, determining the energy absorption time of the second switch based on the inductor stored energy, the energy conversion efficiency of the energy recovery system, and a time adjustment term includes: determining a time adjustment term based on the maximum safe temperature of the heating film and the actual temperature of the heating film when the charging circuit is pre-off; determining a time reference term based on the inductor stored energy, the energy conversion efficiency, and the maximum safe power of the heating film; and determining the energy absorption time based on the time adjustment term and the time reference term.

[0007] In some embodiments, determining a time adjustment term based on the maximum safe temperature of the heating film and the actual temperature of the heating film when the charging circuit is pre-shutdown includes: determining a temperature difference based on the maximum safe temperature and the actual temperature; determining a temperature percentage based on the quotient of the temperature difference and the maximum safe temperature; and determining a time adjustment term based on the product of the temperature percentage and a preset adjustment weight.

[0008] In some embodiments, determining a time reference term based on inductor stored energy, energy conversion efficiency, and the maximum safe power of the heating film includes: determining the maximum actual absorbed power of the heating film based on the product of energy conversion efficiency and maximum safe power; and determining the time reference term based on the quotient of inductor stored energy and maximum actual absorbed power.

[0009] In some embodiments, determining the energy absorption time based on a time adjustment term and a time reference term includes: determining a time adjustment amount based on the product of the time adjustment term and the time reference term; and determining the energy absorption time based on the sum of the time adjustment amount and the time reference term.

[0010] In some embodiments, determining the absorbable energy of the heating film per unit time based on inductor stored energy, energy conversion efficiency, and energy absorption time includes: determining the total absorbable energy of the heating film based on the quotient of inductor stored energy and energy conversion efficiency; and determining the absorbable energy of the heating film per unit time based on the quotient of the total absorbable energy and energy absorption time.

[0011] In some embodiments, determining the duty cycle of the PWM signal of the second switch of the energy absorption circuit based on the absorbable energy includes: determining the operating power of the heating film based on the battery voltage and the maximum safe current of the heating film; and determining the duty cycle based on the absorbable energy and the operating power of the heating film.

[0012] In a second aspect, embodiments of the present invention provide an energy recovery control method, applied to any of the inductor energy recovery methods provided in the first aspect, comprising: detecting voltage changes at the control terminal of a first switching transistor; when the voltage at the control terminal of the first switching transistor reaches a pre-turn-off threshold, acquiring the instantaneous charging current of the charging circuit, and obtaining the inductor stored energy, duty cycle, and energy absorption time through the inductor energy recovery method; controlling a second switching transistor to operate with a duty cycle and energy absorption time, so that the energy absorption circuit absorbs the inductor stored energy.

[0013] In a third aspect, embodiments of the present invention provide an energy recovery system applied to the energy recovery control method provided in the second aspect, comprising: a charging circuit including a battery and a first switching transistor, the first switching transistor being used to connect the battery and a target device for providing charging energy to the battery; an energy absorption circuit including a second switching transistor and a heating film attached to the battery, the second switching transistor being used to connect the heating film and the charging circuit, the second switching transistor being used to conduct the charging circuit and the energy absorption circuit during pre-shutdown; and a main control unit connected to the first switching transistor and the second switching transistor, the main control unit being used to detect voltage changes at the control terminal of the first switching transistor and to control the on / off state of the second switching transistor, the main control unit being also used to detect the temperature of the heating film, and the main control unit being also used to execute the energy recovery control method when the voltage at the control terminal of the first switching transistor reaches a pre-shutdown threshold, so as to obtain a drive signal sent to the control terminal of the second switching transistor, the drive signal being a PWM signal with a duty cycle running during the energy absorption time.

[0014] In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium storing processor-executable computer program instructions, which, when executed by a processor, cause the computer to perform any of the inductor energy recovery methods provided in the first aspect, or to perform the energy recovery control method provided in the second aspect.

[0015] The embodiments of the present invention have the following beneficial effects: Unlike related technologies, the embodiments of the present invention calculate the inductance stored energy based on the instantaneous charging current of the charging circuit at the moment the first switch is pre-turned off and the equivalent inductance of the charging circuit when the battery stops charging. The energy absorption time is calculated based on the inductance stored energy, energy conversion efficiency, and the influence of the actual temperature of the heating film on the energy absorption time. The absorbable energy per unit time of the heating film is calculated based on the inductance stored energy, energy conversion efficiency, and energy absorption time. Thus, the duty cycle of the PWM signal of the second switch can be calculated based on the absorbable energy, and the operation of the second switch can be controlled according to the duty cycle of the PWM signal, enabling the heating film to absorb the inductance stored energy and heat the battery. The inductance stored energy is not dissipated unnecessarily, improving energy utilization. Furthermore, the embodiments of the present invention do not require additional transformer design to recover the inductance stored energy; they utilize the existing heating film of the energy recovery system to absorb the inductance stored energy, thereby not increasing the system size and reducing system cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the accompanying drawings used in the description of the related technologies or embodiments will be briefly introduced below. Obviously, the drawings described below only show some embodiments of the present invention and should not be considered as limiting the scope of protection. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 These are schematic diagrams of the energy recovery system provided in some embodiments of the present invention;

[0018] Figure 2 This is a schematic diagram illustrating application scenarios of the inductor energy recovery method provided in some embodiments of the present invention;

[0019] Figure 3 This is a schematic flowchart of an inductor energy recovery method provided in some embodiments of the present invention;

[0020] Figure 4 This is a schematic diagram of a sub-process of step S32 in the inductor energy recovery method provided in some embodiments of the present invention;

[0021] Figure 5 This is a schematic flowchart of an energy recovery control method provided in some embodiments of the present invention. Detailed Implementation

[0022] To make the objectives and advantages of the embodiments of the present invention more readily understood, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The detailed description of the embodiments of the present invention in the accompanying drawings is not intended to limit the scope of protection claimed by the present invention, but only to illustrate selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that, unless there is a conflict, the various technical features involved in the embodiments of the present invention described below can be combined with each other, and all are within the protection scope of the present invention. Furthermore, although functional modules are divided in the device or structural schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. In addition, the terms "first," "second," "third," and other similar expressions used herein do not limit the data or execution order, but are only for illustrative purposes and to distinguish identical or similar items with substantially the same function and effect, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features.

[0024] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. It should be understood that the term "and / or" as used herein includes any and all combinations of one or more of the listed items.

[0025] In a truck engine charging system, a high-power generator charges the battery pack via a charging MOSFET. The charging system includes the generator, charging MOSFET, inductor, and battery. Due to the presence of distributed inductance and cable inductance in the charging circuit, when the charging process is suddenly interrupted (such as when the charging MOSFET turns off, the fuse blows, or a circuit fault occurs), a very high back electromotive force will be induced, based on the characteristic that inductor current cannot change abruptly.

[0026] In related technologies, an RC snubber circuit or a TVS diode is connected in parallel between the drain and source of the charging MOSFET. The inductor energy is dissipated as heat through the RC snubber circuit or TVS diode to suppress voltage spikes in the system. However, this approach cannot effectively utilize inductor energy and has problems such as low energy utilization, large heat generation, and large size in high-current applications.

[0027] The inventors also discovered that in related technologies, the primary winding of a transformer is used as the main circuit inductor, and the secondary winding is used as the energy feedback winding. The energy feedback winding charges the battery and absorbs the energy of the main circuit. Although this scheme can reduce the energy and reverse voltage borne by the MOSFET in the switching module, it still has the following limitations: (1) It requires the design of an additional transformer, which increases the system size and cost; (2) The energy is ultimately fed back to the battery, which may cause overcharging risk when the battery is fully charged or nearly fully charged.

[0028] In view of this, embodiments of the present invention provide an inductor energy recovery method. The inductor stored energy is calculated based on the instantaneous charging current of the charging circuit at the moment the first switch is pre-turned off and the equivalent inductance of the charging circuit when the battery stops charging. The energy absorption time is calculated based on the inductor stored energy, energy conversion efficiency, and the influence of the actual temperature of the heating film on the energy absorption time. The absorbable energy per unit time of the heating film is calculated based on the inductor stored energy, energy conversion efficiency, and energy absorption time. Thus, the duty cycle of the PWM signal of the second switch can be calculated based on the absorbable energy, and the operation of the second switch can be controlled according to the duty cycle of the PWM signal, allowing the heating film to absorb the inductor stored energy. This enables the heating film to heat the battery, preventing the inductor stored energy from being dissipated unnecessarily and improving energy utilization. Furthermore, embodiments of the present invention do not require the additional design of a transformer to recover the inductor stored energy. Utilizing the existing heating film in the energy recovery system to absorb the inductor stored energy reduces system size and cost. Simultaneously, the inductor stored energy is not fed back to the battery, avoiding the risk of overcharging.

[0029] Please see Figure 1 , Figure 1 The schematic diagram illustrates the structure of an energy recovery system provided in some embodiments of the present invention.

[0030] like Figure 1 As shown, the energy recovery system 100 is used to execute the energy recovery control method. The energy recovery system 100 includes a charging circuit 110, an energy absorption circuit 120, and a main control unit 130. The main control unit 130 is connected to the charging circuit 110 and the energy absorption circuit 120.

[0031] The charging circuit 110 includes a battery 111 and a first switching transistor Q1. The first switching transistor Q1 is used to connect the battery 111 and the target device 200 (such as the aforementioned generator) that provides charging power to the battery 111.

[0032] The energy absorption circuit 120 includes a second switch Q2 and a heating film 121 attached to the battery 111. The second switch Q2 is used to connect the heating film 121 and the charging circuit 110. Specifically, the second switch Q2 connects the heating film 121 and the battery 111. The second switch Q2 is also used to turn on the energy absorption circuit 120 and the charging circuit during pre-off.

[0033] The main control unit 130 is connected to the first switching transistor Q1, the second switching transistor Q2, the battery 111, the heating film 121, and the target device 200. Specifically, the main control unit 130 includes a first control pin GATE1, a second control pin GATE2, a voltage detection module 131, and a current detection module 132. The main control unit 130 can be any suitable type of electronic component, such as a microcontroller, FPGA chip, or a single-chip microcomputer.

[0034] In this configuration, the gate (G) of the first switching transistor Q1 is connected to the first control pin GATE1 and the first terminal of the voltage detection module 131. The drain (D) of the first switching transistor Q1 is connected to the target device 200, and the source (S) of the first switching transistor Q1 is connected to the positive terminal of the battery 111 and the second terminal of the voltage detection module 131. The target device 200 is connected to the first terminal of the current detection module 132, and the negative terminal of the battery 111 and the first terminal of the heating film 121 are connected to the second terminal of the current detection module 132. The drain (D) of the second switching transistor Q2 is connected to the positive terminal of the battery 111, the second terminal of the voltage detection module 131, and the source (S) of the first switching transistor Q1. The gate (G) of the second switching transistor Q2 is connected to the second control pin GATE2, and the source (S) of the second switching transistor Q2 is connected to the second terminal of the heating film 121.

[0035] The main control unit 130 detects the change in voltage at the control terminal (i.e., the gate and source of the first switching transistor Q1) through the voltage detection module 131 to determine whether the first switching transistor Q1 has entered a pre-off state and whether it has been turned off. The main control unit 130 is also used to control the turn-on and turn-off of the second switching transistor Q2. Specifically, when the main control unit 130 detects that the first switching transistor Q1 is in a pre-off state, it executes the energy recovery control method in this embodiment of the invention to obtain a drive signal for driving the second switching transistor Q2. The main control unit 130 sends the drive signal to the control terminal (i.e., the gate of the second switching transistor Q2) through the second control pin GATE2.

[0036] The main control unit 130 is also used to detect the temperature of the heating film 121, wherein the heating film 121 is provided with a temperature sensor connected to the main control unit 130. Figure 1 (Not shown in the image), the temperature sensor detects and collects the temperature of the heating film 121 in real time and transmits the temperature of the heating film 121 to the main control unit 130.

[0037] Specifically, the charging circuit 110 is used to charge the battery 111, and the first switching transistor Q1 controls the switching of the charging circuit of the battery 111. When the target device 200 is running, the main control unit 130 applies a conduction signal to the control terminal of the first switching transistor Q1 through the first control pin GATE1 to control the first switching transistor Q1 to conduct. At this time, the target device 200, the first switching transistor Q1, the battery 111, and the main control unit 130 form a charging circuit. The current direction of the charging circuit is: target device 200 → first switching transistor Q1 → battery 111 → main control unit 130 → target device 200. The target device 200 provides charging energy to the battery 111 through the charging circuit, thereby charging the battery 111. During the process of the target device 200 charging the battery 111 through the charging circuit, the second switch Q2 is continuously turned off. The main control unit 130 uses the voltage detection module 131 to detect the voltage at the control terminal (i.e., the gate and source of the first switch Q1) in real time, and uses the current detection module 132 to detect the current of the charging circuit in real time.

[0038] In this embodiment of the invention, the voltage detection module 131 of the main control unit 130 can be any existing voltage detection circuit, and can be, but is not limited to, a voltage detection circuit composed of resistors. The current detection module 132 of the main control unit 130 can be any existing current detection circuit, such as a Hall element detection circuit.

[0039] Please see Figure 2 For example, at the instant when the target device 200 stops providing charging power to the battery 111, the target device 200 and the line in the charging circuit 110 will form an equivalent inductance L. When the target device 200 stops running, the equivalent inductance L will store energy. For example, when the target device 200 is a generator, when the generator stops running, the generator winding and the equivalent inductance L formed by the generator and the connection line between the generator and the charging circuit 110 will store energy.

[0040] At the instant the target device 200 stops supplying charging power to the battery, the main control unit 130 simultaneously monitors the turn-off status of the first switch Q1, that is, whether the voltage at the control terminal of the first switch Q1 reaches the pre-turn-off threshold. When the pre-turn-off threshold is reached, a drive signal needs to be provided to the second switch Q2 in a short time so that the energy stored in the equivalent inductance L can be absorbed by the heating film 121 in the energy absorption circuit 120. Figure 2 As shown, at the instant when the target device 200 stops supplying charging power to the battery 111, the following circuit connection relationship is formed:

[0041] The gate (G) of the first switching transistor Q1 is connected to the first control pin GATE1 and the first terminal of the voltage detection module 131. The drain (D) of the first switching transistor Q1 is connected to the first terminal of the equivalent inductance L. The source (S) of the first switching transistor Q1 is connected to the positive terminal of the battery 111 and the second terminal of the voltage detection module 131. The second terminal of the equivalent inductance L is connected to the first terminal of the current detection module 132. The negative terminal of the battery 111 and the first terminal of the heating film 121 are connected to the second terminal of the current detection module 132. The drain (D) of the second switching transistor Q2 is connected to the positive terminal of the battery 111, the second terminal of the voltage detection module 131, and the source (S) of the first switching transistor Q1. The gate (G) of the second switching transistor Q2 is connected to the second control pin GATE2. The source (S) of the second switching transistor Q2 is connected to the second terminal of the heating film 121.

[0042] When the voltage at the control terminal of the first switch Q1 reaches the pre-shutdown threshold and is in the pre-shutdown state, the second switch Q2 is activated, thereby forming an energy recovery loop from the equivalent inductance L to the heating film 121: equivalent inductance L → first switch Q1 → second switch Q2 → heating film 121.

[0043] The pre-turn-off state refers to the state in which the first switch Q1 is about to turn off when the voltage at the control terminal of the first switch Q1 reaches the pre-turn-off threshold. For example, if the pre-turn-off threshold is 4V, the first switch Q1 will enter the pre-turn-off state when the voltage at the control terminal of the first switch Q1 drops to the pre-turn-off threshold of 4V. The first switch Q1 needs a certain reaction time from the moment it enters the pre-turn-off state to complete turn-off. The reaction time can be called the time required for predicted turn-off.

[0044] Among them, the time required for prediction shutdown Calculation formula: . In the formula, This represents the reaction time of the first switch Q1 from the moment it enters the pre-turn-off state to the moment it is fully turned off. This is the voltage difference between the gate and source terminals of the first switch Q1 at the instant it enters the pre-off state. This is the voltage difference between the gate and source terminals when the first switch Q1 is completely turned off. To determine the rate of voltage drop at the control terminal of the first switching transistor Q1, it is necessary to... Take the absolute value before performing subsequent calculations.

[0045] For example, the energy absorption time of the second switch Q2 is determined based on the energy stored in the inductor, the energy conversion efficiency of the energy recovery system 100, and a time adjustment term. The time adjustment term characterizes the effect of the actual temperature of the heating film 121 on the energy absorption time.

[0046] For example, the absorbable energy of the heating film 121 per unit time is determined based on the energy stored in the inductor, the energy conversion efficiency of the energy recovery system 100, and the energy absorption time. The duty cycle D of the PWM signal of the second switch Q2 of the energy absorption circuit 120 is then determined based on the absorbable energy.

[0047] In this embodiment of the invention, the aforementioned drive signal sent by the main control unit 130 to the second switch Q2 is a pulse signal (PWM signal) with a duty cycle D that operates during the energy absorption time.

[0048] As can be understood from the above, the implementing entity of the inductor energy recovery method and energy recovery control method provided in the embodiments of the present invention can be any suitable type of main control unit processor with certain computing and control capabilities, such as the main control unit 130 mentioned above.

[0049] The following will describe in detail the inductive energy recovery method and energy recovery control method provided by the embodiments of the present invention, with reference to exemplary applications and implementations of the energy recovery system provided in the embodiments of the present invention.

[0050] The following describes in detail the inductor energy recovery method provided by the embodiments of the present invention.

[0051] Understandably, the inductor energy recovery method provided in this embodiment of the invention can be applied to the aforementioned main control unit (e.g., the main control unit 130 of the energy recovery system 100). Specifically, the main control unit of the energy recovery system is the executing entity of the inductor energy recovery method.

[0052] See Figure 3 As shown, the embodiment of the present invention realizes the inductor energy recovery method through steps S31 to S34.

[0053] S31: Based on the target inductance and target current, determine the inductance stored energy of the target inductance when the battery stops charging.

[0054] Wherein, the target inductance is the equivalent inductance of the charging circuit when the battery stops charging, and the target current is the instantaneous charging current of the charging circuit at the moment when the first switch is pre-turned off.

[0055] In this embodiment, at the instant the target device stops supplying charging power to the battery, an equivalent inductance is formed between the target device and the circuit in the charging circuit. When the target device stops operating, this equivalent inductance stores energy. For example, when the target device is a generator, the equivalent inductance formed by the generator windings and the connection lines between the generator and the charging circuit when the generator stops operating. At the instant the target device stops supplying charging power to the battery, the main control unit simultaneously monitors the turn-off status of the first switching transistor, i.e., whether the voltage at the control terminal of the first switching transistor reaches the pre-turn-off threshold. When the pre-turn-off threshold is reached, a drive signal needs to be provided to the second switching transistor within a short time so that the energy stored in the equivalent inductance can be absorbed by the heating film in the energy absorption circuit. At the instant the target device stops supplying charging power to the battery, an equivalent inductance is formed... Figure 2 The circuit connection is shown. When the voltage at the control terminal of the first switch reaches the pre-turn-off threshold and is in the pre-turn-off state, this embodiment of the invention obtains the equivalent inductance of the charging circuit when the battery stops charging as the target inductance, and obtains the instantaneous charging current of the charging circuit at the moment the first switch is pre-turned off as the target current. After obtaining the target inductance and target current, the inductance stored energy of the target inductance when the battery stops charging is calculated based on the target inductance and target current.

[0056] In some embodiments, the specific process of determining the inductance stored energy of the target inductor when the battery stops charging, based on the target inductance and the target current, is as follows:

[0057] According to the energy calculation formula: Substitute the target inductance and target current into the energy calculation formula to calculate the energy stored in the inductor. To store energy in an inductor For target inductance / equivalent inductance, Target current / instantaneous charging current.

[0058] S32: Determine the energy absorption time of the second switch based on the energy stored in the inductor, the energy conversion efficiency of the energy recovery system, and the time adjustment term.

[0059] Among them, the time adjustment term characterizes the influence of the actual temperature of the heating film on the energy absorption time. The energy absorption time of the second switch is the working time of the second switch, that is, the time it takes for the energy absorption circuit to transfer the energy stored in the inductor to the heating film, which is also the time interval from detecting the first switch's turn-off intention to the voltage spike falling back to the safety threshold.

[0060] For example, in this embodiment of the invention, a time adjustment term is calculated based on the actual temperature of the heating film when the charging circuit is pre-off and the maximum safe temperature. A time reference term is calculated based on the energy stored in the inductor, the energy conversion efficiency, and the maximum safe power of the heating film. The energy absorption time of the second switching transistor is calculated based on the time adjustment term and the time reference term.

[0061] Specifically, embodiments of the present invention obtain the actual temperature of the heating film when the charging circuit is pre-shutdown, as well as the maximum safe temperature and maximum safe power of the heating film. The maximum safe temperature refers to the highest temperature the heating film itself can withstand, and this maximum safe temperature depends on the material and structure of the heating film. The maximum safe power refers to the highest power the heating film itself can withstand over a long period, and this maximum safe power depends on the material and heat dissipation conditions of the heating film. In some embodiments, the maximum safe temperature and maximum safe power of the heating film are stored in the local storage of the energy recovery system (e.g., the storage module of the main control unit), and embodiments of the present invention obtain the maximum safe temperature and maximum safe power of the heating film from the local storage of the energy recovery system. In other embodiments, embodiments of the present invention read the actual temperature of the heating film detected and collected by a temperature sensor equipped on the heating film when the charging circuit is pre-shutdown, thereby obtaining the actual temperature of the heating film when the charging circuit is pre-shutdown.

[0062] In some embodiments, the energy conversion efficiency of an energy recovery system refers to the overall efficiency of converting inductively stored energy into thermal energy. This energy conversion efficiency includes the conversion efficiency of the energy absorption circuit, the thermal energy conversion efficiency of the heating film, etc. It is understood that in any electrical-to-thermal energy conversion system, the energy conversion efficiency cannot reach 100%. The energy conversion efficiency within the range of [0.7, 0.9] is an empirical value in power electronics design. In this embodiment of the invention, engineers preset the energy conversion efficiency of the energy recovery system to 0.9 and store it in the local storage of the energy recovery system (e.g., the storage module of the main control unit). This embodiment of the invention obtains the energy conversion efficiency of the energy recovery system from its local storage. It should be understood that in other systems, engineers set the energy conversion efficiency to any suitable value based on experimental data and empirical data.

[0063] See Figure 4 As shown, in this embodiment of the invention, steps S321 to S323 are used to realize the energy conversion efficiency and time adjustment item based on the inductor energy storage and energy recovery system, and to determine the energy absorption time of the second switch.

[0064] S321: Determine the time adjustment item based on the maximum safe temperature of the heating film and the actual temperature of the heating film when the charging circuit is pre-shutdown.

[0065] In some embodiments, the specific process for determining the time adjustment term based on the maximum safe temperature of the heating film and the actual temperature of the heating film when the charging circuit is pre-shutdown is as follows:

[0066] The temperature difference is determined based on the maximum safe temperature and the actual temperature.

[0067] The temperature percentage is determined based on the quotient of the temperature difference and the maximum safe temperature.

[0068] The time adjustment item is determined by multiplying the temperature percentage value and the preset adjustment weight.

[0069] In this embodiment of the invention, the temperature difference is equal to the difference between the maximum safe temperature and the actual temperature. The calculation method is as follows: ,in, This is the temperature difference value. For the maximum safe temperature, This is the actual temperature.

[0070] In this embodiment of the invention, the temperature percentage is equal to the ratio of the temperature difference to the maximum safe temperature, that is: , This represents the temperature percentage.

[0071] In this embodiment of the invention, the time adjustment term is equal to the product of the temperature percentage and the preset adjustment weight, that is: , To preset the adjustment weights, This is a time adjustment item.

[0072] in, is a weighting factor for temperature, which is a configurable dimensionless parameter used to adjust the weight of the influence of the heating film temperature state on the energy absorption time. The typical value range is 0.3 to 0.8. In this embodiment of the invention, it is set to... The preset weight of 0.5 controls the degree to which the actual temperature of the heating film affects the energy absorption time.

[0073] S322: Determine the time reference term based on the energy stored in the inductor, the energy conversion efficiency, and the maximum safe power of the heating film.

[0074] In some embodiments, the specific process for determining the time reference term based on the inductor stored energy, energy conversion efficiency, and the maximum safe power of the heating film is as follows:

[0075] The maximum actual absorbed power of the heating film is determined by multiplying the energy conversion efficiency and the maximum safe power.

[0076] The time reference term is determined based on the quotient of the energy stored in the inductor and the maximum actual absorbed power.

[0077] In this embodiment, the maximum actual absorbed power of the heating film is equal to the product of the energy conversion efficiency and the maximum safe power, that is: , For the maximum actual absorbed power, For energy conversion efficiency, This is the maximum safe power.

[0078] In this embodiment of the invention, the time reference term is equal to the ratio of the inductor's stored energy to the maximum actual absorbed power, that is: , To store energy in an inductor This is a time reference item.

[0079] S323: Determine the energy absorption time based on the time adjustment term and the time reference term.

[0080] For example, in some embodiments, the specific process of determining the energy absorption time based on the time adjustment term and the time reference term is as follows:

[0081] The time adjustment amount is determined based on the product of the time adjustment term and the time base term;

[0082] The energy absorption time is determined based on the sum of the time adjustment and the time reference term.

[0083] In this embodiment of the invention, the time adjustment amount is equal to the product of the time adjustment term and the time base term, that is: , Adjustment amount for time.

[0084] In this embodiment of the invention, the energy absorption time is equal to the sum of the time adjustment amount and the time reference term, that is: .

[0085] S33: Determine the absorbable energy of the heating film per unit time based on the energy stored in the inductor, the energy conversion efficiency, and the energy absorption time.

[0086] For example, in some embodiments, the specific process of determining the absorbable energy of the heating film per unit time based on inductor stored energy, energy conversion efficiency, and energy absorption time is as follows:

[0087] The total absorbable energy of the heating film is determined by the quotient of the energy stored in the inductor and the energy conversion efficiency.

[0088] The absorbable energy per unit time of the heating film is determined by the quotient of the total absorbable energy and the energy absorption time.

[0089] In this embodiment, the total absorbable energy of the heating film is obtained in the following way: ,in, To store energy in an inductor Energy conversion efficiency.

[0090] In this embodiment, the method by which the heating film can absorb energy per unit time is as follows: , It represents the absorbable energy per unit time.

[0091] S34: Based on the absorbable energy, determine the duty cycle of the PWM signal of the second switch of the energy absorption circuit.

[0092] For example, in this embodiment of the invention, the battery voltage (i.e., the voltage across the battery when the energy absorption circuit recovers energy stored in the inductor) and the maximum safe current of the heating film are obtained. The maximum safe current refers to the highest current that the heating film itself can withstand, and the maximum safe current depends on the material and structure of the heating film, etc.

[0093] In some embodiments, the maximum safe current of the heating film is stored in the local storage of the energy recovery system (e.g., the storage module of the main control unit). In this embodiment, the maximum safe current of the heating film is obtained from the local storage of the energy recovery system. In other embodiments, the maximum safe current of the heating film can be calculated based on the maximum safe power of the heating film and the battery voltage; that is, the maximum safe current of the heating film is equal to the quotient of the maximum safe power of the heating film and the battery voltage.

[0094] For example, in this embodiment of the invention, the operating power of the heating film is calculated based on the battery voltage and the maximum safe current of the heating film, and the duty cycle of the PWM signal of the second switching transistor is calculated based on the absorbable energy and the operating power of the heating film.

[0095] For example, in some embodiments, the specific process of determining the duty cycle of the PWM signal of the second switch transistor controlling the energy absorption circuit based on the absorbable energy is as follows:

[0096] The operating power of the heating film is determined based on the battery voltage and the maximum safe current of the heating film.

[0097] The duty cycle is determined based on the absorbable energy and the operating power of the heating film.

[0098] In this embodiment, the operating power of the heating film is equal to the product of the battery voltage and the maximum safe current of the heating film, that is: , The operating power of the heating film, This refers to the battery voltage. This is the maximum safe current for the heating film.

[0099] In this embodiment, the duty cycle of the PWM signal is equal to the product of the quotient of the absorbable energy and the operating power of the heating film, and a preset percentage, that is: , For preset percentages, This refers to the duty cycle of the PWM signal. It is capable of absorbing energy.

[0100] The energy recovery control method provided by the embodiments of the present invention will be described in detail below.

[0101] Understandably, the energy recovery control method provided in this embodiment of the invention can be applied to the aforementioned main control unit (e.g., the main control unit 130 of the energy recovery system 100). Specifically, the main control unit of the energy recovery control method is the executing entity of the energy recovery system.

[0102] See Figure 5 As shown, the energy recovery control method is implemented through steps S41 to S43 in this embodiment of the invention.

[0103] S41: Detects the voltage change at the control terminal of the first switching transistor.

[0104] S42: When the voltage at the control terminal of the first switching transistor reaches the pre-turn-off threshold, the instantaneous charging current of the charging circuit is obtained, and the inductor stored energy, duty cycle and energy absorption time are obtained through the inductor energy recovery method.

[0105] S43: Controls the second switch to operate with a duty cycle and energy absorption time so that the energy absorption circuit absorbs energy stored in the inductor.

[0106] For example, in this embodiment of the invention, the voltage change at the control terminal of the first switching transistor is detected in real time by a voltage detection module, and the voltage at the control terminal of the first switching transistor is obtained in real time. When the voltage at the control terminal of the first switching transistor reaches the pre-turn-off threshold and is in a pre-turn-off state, it indicates that the first switching transistor is about to turn off. The instantaneous charging current of the charging circuit at the moment of pre-turn-off of the first switching transistor is obtained, and the inductance stored energy of the target inductor, the duty cycle of the PWM signal of the second switching transistor, and the energy absorption time of the second switching transistor are obtained through the inductance energy recovery method provided in the aforementioned embodiment of the invention. In this embodiment of the invention, the second switching transistor is controlled to turn on according to the duty cycle of the PWM signal of the second switching transistor and the energy absorption time of the second switching transistor. That is, a PWM signal is generated with the calculated duty cycle D, and a PWM signal with duty cycle D is continuously output to the second switching transistor, so that the second switching transistor operates with duty cycle D and energy absorption time, thereby utilizing the heating film in the energy absorption circuit to absorb the inductance stored energy.

[0107] The following sections will use several typical scenarios to demonstrate in detail the logic of the inductor energy recovery method and energy recovery control method provided in the embodiments of the present invention.

[0108] Common parameter settings:

[0109] Equivalent Inductance Battery voltage Maximum safe current of the heating film Energy conversion efficiency of energy recovery system Maximum safe temperature of heating film ℃, temperature weighting coefficient .

[0110] Scenario 1: Verification under typical operating conditions (normal temperature, medium current)

[0111] Operating parameters:

[0112] Target current / Instantaneous charging current: The actual temperature of the heating film: ℃.

[0113] Verification calculation:

[0114] 1. The energy stored in the inductor is calculated using the energy calculation formula, i.e.: J stands for Joule.

[0115] 2. The energy absorption time is calculated using the energy absorption time calculation formula, i.e.: ,in, .

[0116] 3. The absorbable energy per unit time can be calculated using the energy absorption calculation formula, i.e.: .

[0117] 4. The duty cycle of the PWM signal is calculated using the duty cycle calculation formula, i.e.: .

[0118] Verification conclusion: Under typical operating conditions, controlling the second switch transistor to operate at a duty cycle of 70.57% results in a value of 254.05. The heating film can absorb all the energy stored by the inductor.

[0119] Scenario 2: High-current impact verification (room temperature, high current)

[0120] Operating parameters:

[0121] Target current / Instantaneous charging current: The actual temperature of the heating film: ℃.

[0122] Verification calculation:

[0123] 1. The energy stored in the inductor is calculated using the energy calculation formula, i.e.: J stands for Joule.

[0124] 2. The energy absorption time is calculated using the energy absorption time calculation formula, i.e.: ,in, .

[0125] 3. The absorbable energy per unit time can be calculated using the energy absorption calculation formula, i.e.: .

[0126] 4. The duty cycle of the PWM signal is calculated using the duty cycle calculation formula, i.e.: .

[0127] Verification conclusion: Under normal temperature and high current conditions, controlling the second switching transistor to operate at a duty cycle of 70.59% for 1093... The heating film can absorb all the energy stored in the inductor and maintain the same power level, demonstrating excellent self-adaptive capability.

[0128] Scenario 3: High Temperature Protection Verification (High Temperature, Medium Current)

[0129] Operating parameters:

[0130] Target current / Instantaneous charging current: The actual temperature of the heating film: ℃.

[0131] Verification calculation:

[0132] 1. The energy stored in the inductor is calculated using the energy calculation formula, i.e.: J stands for Joule.

[0133] 2. The energy absorption time is calculated using the energy absorption time calculation formula, i.e.: ,in, .

[0134] 3. The absorbable energy per unit time can be calculated using the energy absorption calculation formula, i.e.: .

[0135] 4. The duty cycle of the PWM signal is calculated using the duty cycle calculation formula, i.e.: .

[0136] Verification conclusion: Under high temperature and medium current conditions, controlling the second switching transistor to operate at a duty cycle of 96.77% yields 199.3. The heating film can absorb all the energy stored in the inductor, increasing the absorbable energy to near the maximum safe power, thus prioritizing the safety of the heating film.

[0137] Scenario 4: Extreme boundary verification (high temperature, high current)

[0138] Operating parameters:

[0139] Target current / Instantaneous charging current: The actual temperature of the heating film: ℃.

[0140] Verification calculation:

[0141] 1. The energy stored in the inductor is calculated using the energy calculation formula, i.e.: J stands for Joule.

[0142] 2. The energy absorption time is calculated using the energy absorption time calculation formula, i.e.: ,in, .

[0143] 3. The absorbable energy per unit time can be calculated using the energy absorption calculation formula, i.e.: .

[0144] 4. The duty cycle of the PWM signal is calculated using the duty cycle calculation formula, i.e.: .

[0145] Verification conclusion: Under high temperature and high current conditions, controlling the second switching transistor to operate at a duty cycle of 98.36% for 1130... The heating film can absorb all the energy stored in the inductor, increasing the absorbable energy to near the maximum safe power, thus prioritizing the safety of the heating film.

[0146] The voltage spike suppression effect of the energy recovery system in the embodiments of the present invention will be described in detail below.

[0147] To quantitatively evaluate the protective effect of the heating film absorbing inductor-stored energy to suppress voltage spikes, this invention establishes a voltage spike theoretical model based on the law of conservation of energy. This voltage spike theoretical model demonstrates that the inductor stores energy... The power is redistributed at the moment of pre-turn-off of the first switch:

[0148] A portion of the energy (i.e.: The remaining energy (i.e., energy absorbed by the heating film) is effectively absorbed by the heating film. The parasitic capacitance transferred to the energy recovery system .

[0149] According to the capacitor energy storage formula The remaining energy will cause the voltage across the capacitor to rise, which will be superimposed on the voltage of the battery. Above, forming peak voltage Therefore, the final formula for calculating the peak voltage is derived as follows:

[0150] .

[0151] Parasitic capacitance As an inherent buffering capacity of energy recovery systems, and as a passive energy absorption pathway, For the battery voltage, The energy conversion efficiency of the parasitic capacitance.

[0152] Example of actual engineering calculation:

[0153] Given: Battery voltage Target current / instantaneous charging current Target inductance / equivalent inductance Parasitic capacitance of energy recovery system .

[0154] Scenario 1: Unprotected Scenario

[0155] The energy stored in the inductor is calculated using the energy calculation formula, namely: J stands for Joule.

[0156] Because there is no heating film to absorb inductor-stored energy to suppress voltage spikes, all the inductor-stored energy impacts the capacitor, thus affecting the energy conversion efficiency of the energy recovery system. In this state, the energy stored in the inductor is released only through the parasitic capacitance path of the energy recovery system, resulting in high energy conversion efficiency. The energy conversion efficiency of an ideal lossless path (i.e., parasitic capacitance) is characterized. To simplify calculations and reflect common estimations, the embodiments of this invention use... .

[0157] The peak voltage is calculated using the peak voltage calculation formula, namely: .

[0158] Conclusion: Without a heating film to absorb and store energy in the inductor to suppress voltage spikes, the system will generate a peak voltage of 337.553V, which is very likely to damage the device.

[0159] Scenario 2: Protection scenario using embodiments of the present invention

[0160] The energy stored in the inductor is calculated using the energy calculation formula, namely: J stands for Joule.

[0161] At this point, the heating film absorbs more inductive energy for storage. For example, if the heating film absorbs 90% of the inductive energy for storage, then... The heating film, as a highly lossy purely resistive load, is actively connected to the energy absorption circuit. Its resistive characteristics provide a highly damped, highly dissipative path for the release of residual energy, significantly reducing energy conversion efficiency. To simplify calculations and reflect common estimations, this embodiment of the invention uses... .

[0162] The peak voltage is calculated using the peak voltage calculation formula, namely: .

[0163] Conclusion: It is evident that by using a heating film to absorb and store energy in an inductor, the voltage spike of the energy recovery system is significantly suppressed to 29.59V, demonstrating a significant suppression effect. Furthermore, the spike voltage value is close to the battery voltage, which will not cause damage to the device.

[0164] In general, the embodiments of the present invention have at least the following beneficial effects:

[0165] 1. Energy recovery and utilization to improve system energy efficiency: The inductive energy stored in the inductor, which was originally dissipated as heat through RC buffer circuits or TVS tubes, is transferred to actual heating needs (such as battery heating, cab preheating, windshield defrosting, etc.), realizing the effective utilization of inductive energy storage, improving energy utilization rate, and the contribution of inductive energy storage is considerable, thus improving system energy efficiency.

[0166] 2. System cost optimization and integration: By using the heating film configured in the battery in the energy recovery system as an energy discharge unit, there is no need to add expensive TVS tubes, complex RC snubber circuits, or additional transformer designs, which saves costs and space, conforms to the trend of system integration, and avoids the situation where the use of transformers in the design leads to an increase in system size and cost, thus significantly reducing system size and cost.

[0167] 3. Intelligence and Adaptability Enhance Reliability: The inductive energy recovery method and energy recovery control method provided in this embodiment of the invention achieve intelligent control of energy recovery and utilization, ensuring a smooth and controllable energy recovery and utilization process. It also optimizes itself according to the system status (such as charging current and heating film temperature) to adapt to different system operating conditions (such as light load, heavy load, cold start, hot state, etc.), combining safety and intelligence.

[0168] 4. Extend the lifespan of related components: By reducing the impact of voltage spikes in the energy recovery system on the battery and other system components, the lifespan of these components is indirectly extended, reducing the maintenance cost of the energy recovery system throughout its entire life cycle.

[0169] This invention provides a computer-readable storage medium storing processor-executable computer program instructions. When executed by the processor, the computer program instructions cause the computer to perform the inductor energy recovery method or energy recovery control method provided in this invention.

[0170] In some embodiments, the storage medium may be a flash memory, a hard disk, an optical disk, a register, a magnetic surface memory, a removable disk, a CD-ROM, a random access memory (RAM), a read-only memory (ROM), an electrically programmable ROM, and an electrically erasable programmable ROM, or any other form of storage medium known in the art, or various devices including one or any combination of the above storage media.

[0171] In some embodiments, computer program instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0172] As an example, computer program instructions may, but do not necessarily, correspond to files in a file system, and may be stored as part of a file that holds other programs or data, for example, in one or more scripts in an HTML (Hypertext Markup Language) document, or in a single file dedicated to the program in question, or in multiple collaborative files (e.g., a file that stores one or more modules, subroutines, or code sections).

[0173] As an example, computer program instructions can be deployed to execute on a single computing device (including devices such as smart terminals and servers), or on multiple computing devices located in one location, or on multiple computing devices distributed across multiple locations and interconnected via a communication network. It is readily understood that all or part of the steps of the methods described in the embodiments of the present invention above can be implemented directly using electronic hardware or processor-executable computer program instructions, or a combination of both.

[0174] Those skilled in the art will understand that the embodiments provided by this invention are merely illustrative. The order in which the steps in the methods of the embodiments are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The order can be adjusted, merged, and deleted according to actual needs. Modules or sub-modules, units or sub-units in the apparatus or system of the embodiments can be merged, divided, and deleted according to actual needs. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0175] 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, it can be implemented using hardware. Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods.

[0176] It should be noted that the above embodiments are for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiments can be implemented by modifying the technical solutions described in the embodiments of the present invention, or by making equivalent substitutions for some of the technical features. It is understood that these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should be considered as equivalent changes and modifications made based on the embodiments of the present invention, all of which should fall within the scope of the claims of the present invention.

Claims

1. An inductive energy recovery method, applied to an energy recovery system, characterized in that, The energy recovery system includes a charging circuit and an energy absorption circuit. The charging circuit is used to charge the battery and a first switching transistor controls the switching of the battery's charging circuit. The energy absorption circuit includes a heating film attached to the battery and a second switching transistor connecting the heating film and the charging circuit. The method includes: Based on the target inductance and the target current, the inductance stored energy of the target inductance when the battery stops charging is determined. The target inductance is the equivalent inductance on the charging circuit when the battery stops charging, and the target current is the instantaneous charging current of the charging circuit at the moment when the first switch is pre-turned off. Based on the inductor's stored energy, the energy conversion efficiency of the energy recovery system, and a time adjustment term, the energy absorption time of the second switching transistor is determined, including: determining the time adjustment term based on the maximum safe temperature of the heating film and the actual temperature of the heating film when the charging circuit is pre-shutdown; determining a time reference term based on the inductor's stored energy, the energy conversion efficiency, and the maximum safe power of the heating film; and determining the energy absorption time based on the time adjustment term and the time reference term; the time adjustment term characterizes the influence of the actual temperature of the heating film on the energy absorption time. Based on the inductor's stored energy, the energy conversion efficiency, and the energy absorption time, the absorbable energy of the heating film per unit time is determined. Based on the absorbable energy, the duty cycle of the PWM signal controlling the second switch of the energy absorption circuit is determined.

2. The inductive energy recovery method according to claim 1, characterized in that, The step of determining the time adjustment item based on the maximum safe temperature of the heating film and the actual temperature of the heating film when the charging circuit is pre-shutdown includes: The temperature difference is determined based on the maximum safe temperature and the actual temperature; The temperature percentage is determined based on the quotient of the temperature difference and the maximum safe temperature. The time adjustment item is determined based on the product of the temperature percentage and the preset adjustment weight.

3. The inductive energy recovery method according to claim 1, characterized in that, The step of determining the time reference item based on the energy stored in the inductor, the energy conversion efficiency, and the maximum safe power of the heating film includes: The maximum actual absorbed power of the heating film is determined based on the product of the energy conversion efficiency and the maximum safe power. The time reference term is determined based on the quotient of the energy stored in the inductor and the maximum actual absorbed power.

4. The inductive energy recovery method according to claim 1, characterized in that, Determining the energy absorption time based on the time adjustment term and the time reference term includes: The time adjustment amount is determined based on the product of the time adjustment term and the time base term; The energy absorption time is determined based on the sum of the time adjustment amount and the time reference term.

5. The inductive energy recovery method according to claim 1, characterized in that, Determining the absorbable energy of the heating film per unit time based on the inductor's stored energy, the energy conversion efficiency, and the energy absorption time includes: The total absorbable energy of the heating film is determined based on the quotient of the energy stored in the inductor and the energy conversion efficiency. The absorbable energy per unit time of the heating film is determined based on the quotient of the total absorbable energy and the energy absorption time.

6. The inductive energy recovery method according to any one of claims 1-5, characterized in that, Determining the duty cycle of the PWM signal controlling the second switch of the energy absorption circuit based on the absorbable energy includes: The operating power of the heating film is determined based on the voltage of the battery and the maximum safe current of the heating film. The duty cycle is determined based on the absorbable energy and the operating power of the heating film.

7. An energy recovery control method, characterized in that, The method for inductor energy recovery as described in any one of claims 1 to 6 includes: Detect the voltage change at the control terminal of the first switching transistor; When the voltage at the control terminal of the first switch reaches the pre-turn-off threshold, the instantaneous charging current of the charging circuit is obtained, and the inductor stored energy, the duty cycle, and the energy absorption time are obtained through the inductor energy recovery method. The second switch is controlled to operate with the duty cycle and the energy absorption time so that the energy absorption circuit absorbs the energy stored in the inductor.

8. An energy recovery system, characterized in that, The method for energy recovery control as described in claim 7 includes: A charging circuit includes a battery and a first switching transistor, wherein the first switching transistor is used to connect the battery and a target device that provides charging power to the battery; An energy absorption circuit includes a second switching transistor and a heating film attached to the battery. The second switching transistor is used to connect the heating film and the charging circuit. The second switching transistor is used to turn on the charging circuit and the energy absorption circuit when the circuit is pre-off. The main control unit is connected to the first switch and the second switch. The main control unit is used to detect the voltage change at the control terminal of the first switch and to control the on / off state of the second switch. The main control unit is also used to detect the temperature of the heating film. The main control unit is also used to execute the energy recovery control method when the voltage at the control terminal of the first switch reaches the pre-shutdown threshold to obtain a drive signal sent to the control terminal of the second switch. The drive signal is a PWM signal with the duty cycle running during the energy absorption time.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores processor-executable computer program instructions, which, when executed by the processor, cause the computer to perform the inductor energy recovery method as described in any one of claims 1-6 or the energy recovery control method as described in claim 7.

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