CN-121663735-B - Inductive energy recovery method, energy recovery control method, energy recovery system, and storage medium

CN121663735BCN 121663735 BCN121663735 BCN 121663735BCN-121663735-B

Abstract

The embodiment of the invention relates to the technical field of energy recovery, in particular to an inductive energy recovery method, an energy recovery control method, an energy recovery system and a storage medium. According to the embodiment of the invention, the heating film absorbs the inductance energy storage and can be used for heating the battery, so that the inductance energy storage is not dissipated without any reason, the energy utilization rate is improved, and the embodiment of the invention does not need to additionally design a transformer to recover the inductance energy storage, and the existing heating film of the energy recovery system is used for absorbing the inductance energy storage, so that the system volume is not increased, and the system cost is reduced.

Inventors

MA HUI
QIN GENG
LIN ZIHAN
LIN CHENGHUI
WANG YOUMING

Assignees

深圳市德兰明海新能源股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260204

Claims (9)

1. An inductive energy recovery method applied to an energy recovery system, the energy recovery system including a charging circuit for charging a battery and controlling a switch of a charging loop of the battery by a first switching tube, and an energy absorption circuit including a heating film attached to the battery and a second switching tube connecting the heating film and the charging circuit, the method comprising: determining the inductance energy storage energy of a target inductance when the battery stops charging based on the target inductance and a target current, wherein the target inductance is an equivalent inductance on the charging loop when the battery stops charging, and the target current is a charging instantaneous current of the charging loop at the moment of pre-turn-off of the first switching tube; Determining an energy absorption time of the second switching tube based on the inductance stored energy, the energy conversion efficiency of the energy recovery system and a time adjustment term, including determining the time adjustment term according to a maximum safe temperature of the heating film and an actual temperature of the heating film when the charging loop is pre-turned off, determining a time reference term according to the inductance stored energy, the energy conversion efficiency and the maximum safe power of the heating film, determining the energy absorption time according to the time adjustment term and the time reference term, the time adjustment term characterizing an effect of the actual temperature of the heating film on the energy absorption time; Determining an absorbable energy per unit time of the heating film based on the inductive stored energy, the energy conversion efficiency, and the energy absorption time; Based on the absorbable energy, a duty cycle of a PWM signal controlling the second switching tube of the energy absorbing circuit is determined.
2. The inductive energy recovery method according to claim 1, wherein said determining said time adjustment term based on a maximum safe temperature of said heating film and an actual temperature of said heating film at a time of pre-turn off of said charging loop comprises: determining a temperature difference based on the maximum safe temperature and the actual temperature; Determining a temperature occupancy value based on a quotient of the temperature difference and the maximum safe temperature; and determining the time adjustment item based on the product of the temperature occupation ratio and a preset adjustment weight.
3. The inductive energy recovery method of claim 1, wherein said determining a time reference based on said inductive stored energy, said energy conversion efficiency, and said heating film maximum safe power comprises: Determining a maximum actual absorbed power of the heating film based on a product of the energy conversion efficiency and the maximum safe power; the time reference term is determined based on a quotient of the inductive stored energy and the maximum actual absorbed power.
4. The inductive energy recovery method of claim 1, wherein said determining said energy absorption time from said time adjustment term and said time reference term comprises: Determining a time adjustment amount based on a product of the time adjustment term and the time reference 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, wherein said determining an absorbable energy per unit time of said heating film based on said inductive stored energy, said energy conversion efficiency, and said energy absorption time, comprises: Determining an absorbable total energy of the heating film according to a quotient of the inductive stored energy and the energy conversion efficiency; Determining said absorbable energy per unit time of said heating film based on the quotient of said absorbable total energy and said energy absorption time.
6. The inductive energy recovery method according to any one of claims 1-5, wherein said determining a duty cycle of a PWM signal controlling said second switching tube of said energy absorbing circuit based on said absorbable energy comprises: determining an operating power of the heating film based on a voltage of the battery and a 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 by being applied to the inductive energy recovery method according to any one of claims 1 to 6, comprising: Detecting voltage change of a control end of the first switching tube; When the voltage of the control end of the first switching tube reaches a pre-turn-off threshold, acquiring the charging instantaneous current of the charging loop, and acquiring the inductance energy storage, the duty ratio and the energy absorption time through the inductance energy recovery method; and controlling the second switching tube to operate at the duty cycle and the energy absorption time so that the energy absorption circuit absorbs the inductance energy.
8. An energy recovery system, characterized by being applied to the energy recovery control method according to claim 7, comprising: the charging circuit comprises a battery and a first switching tube, wherein the first switching tube is used for connecting the battery and a target device for providing charging electric energy for the battery; The energy absorption circuit comprises a second switching tube and a heating film attached to the battery, the second switching tube is used for connecting the heating film and the charging circuit, and the second switching tube is used for switching on the charging circuit and the energy absorption circuit when the battery is pre-switched off; The main control unit is connected with the first switching tube and the second switching tube, is used for detecting voltage change of a control end of the first switching tube and controlling on-off of the second switching tube, is also used for detecting temperature of the heating film, and is also used for executing the energy recovery control method when the voltage of the control end of the first switching tube reaches the pre-turn-off threshold value so as to obtain a driving signal sent to the control end of the second switching tube, wherein the driving signal is a PWM signal of the duty ratio running in the energy absorption time.
9. A computer readable storage medium storing computer program instructions executable by a processor, which when executed by the processor, cause the computer to perform the inductive energy recovery method of any one of claims 1-6 or the energy recovery control method of claim 7.

Description

Inductive energy recovery method, energy recovery control method, energy recovery system, and storage medium Technical Field The embodiment of the invention relates to the technical field of energy recovery, in particular to an inductive energy recovery method, an energy recovery control method, an energy recovery system and a storage medium. Background In a truck engine charging system, a high-power generator charges a storage battery pack through a charging MOS tube. The charging system comprises a generator, a charging MOS tube, an inductor, a storage battery and the like. Because of the distributed inductance and the cable inductance in the charging loop, when the charging process is suddenly interrupted (such as the turn-off of a charging MOS tube, the fusing of a fuse or the failure of a line, etc.), an extremely high reverse electromotive force is induced according to the characteristic that the inductance current cannot be suddenly changed. In the related art, an RC buffer circuit or a TVS tube is connected in parallel between the drain and the source of the charging MOS tube, and the energy of the distributed inductor and the cable inductor is dissipated in a heat form through the RC buffer circuit or the TVS tube, so that the inductive energy is dissipated in a heat form by the conventional RC buffer circuit and the TVS tube, the inductive energy cannot be effectively utilized, and the problem of large heat productivity is easily caused. In addition, in the related art, there is a problem that the transformer is easy to increase the system volume due to the fact that the inductive energy is recovered by using the polar energy of the transformer. Disclosure of Invention In view of the foregoing, an object of an embodiment of the present invention is to provide an inductive energy recovery method, an energy recovery control method, an energy recovery system and a storage medium, so as to improve the situations of low inductive energy utilization and increased system volume when recovering energy in the related art. In a first aspect, an embodiment of the invention provides an inductive energy recovery method, which is applied to an energy recovery system, wherein the energy recovery system comprises a charging circuit and an energy absorption circuit, the charging circuit is used for charging a battery, a first switching tube is used for controlling a switch of a charging loop of the battery, the energy absorption circuit comprises a heating film attached to the battery and a second switching tube connected with the heating film and the charging circuit, the inductive energy storage of the target inductor when the battery stops charging is determined based on a target inductor and a target current, the target inductor is an equivalent inductor on the charging loop when the battery stops charging, the target current is a charging instantaneous current of the charging loop at a pre-turn-off moment of the first switching tube, an energy absorption time of the second switching tube is determined based on the inductive energy storage and the energy conversion efficiency and the time adjustment term, the time adjustment term characterizes the influence of the actual temperature of the heating film on the energy absorption time, the possible energy absorption time of the heating film is determined based on the inductive energy storage, the energy conversion efficiency and the energy absorption time, and the PWM (pulse width modulation) signal duty ratio of the second switching tube is determined based on the possible absorption energy. In some embodiments, determining the energy absorption time for the second switching tube based on the inductive stored energy, the energy conversion efficiency of the energy recovery system, and the time adjustment term includes determining a time adjustment term based on a maximum safe temperature of the heating film and an actual temperature of the heating film when the charging loop is pre-turned off, determining a time reference term based on the inductive 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. In some embodiments, 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-turned off includes determining a temperature difference based on the maximum safe temperature and the actual temperature, determining a temperature occupancy value based on a quotient of the temperature difference and the maximum safe temperature, and determining the time adjustment term based on a product of the temperature occupancy value and a preset adjustment weight. In some embodiments, determining the time reference term from the inductive energy storage, the energy conversion efficiency, and the maximum safe power of