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CN112234819B - Low-voltage power supply method and device based on DC-DC and electronic equipment - Google Patents

Low-voltage power supply method and device based on DC-DC and electronic equipment Download PDF

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Publication number
CN112234819B
CN112234819B CN202011095532.XA CN202011095532A CN112234819B CN 112234819 B CN112234819 B CN 112234819B CN 202011095532 A CN202011095532 A CN 202011095532A CN 112234819 B CN112234819 B CN 112234819B
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low
voltage
power
actual
preset
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CN112234819A (en
Inventor
张彬彬
王世蒙
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Ruichi Dianzhuang Dalian Electric System Co ltd
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Ruichi Dianzhuang Dalian Electric System Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a low-voltage power supply method and device based on DC-DC and electronic equipment, relates to the technical field of power supply, and solves the technical problem of low electric energy conversion efficiency in the low-voltage power supply process. The method comprises the following steps: calculating the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load; calculating the actual SOC value of the low-voltage battery by an ampere-hour method according to the current of the low-voltage battery; adjusting an operating state of the DC-DC based on the actual power and the actual SOC value.

Description

Low-voltage power supply method and device based on DC-DC and electronic equipment
Technical Field
The present disclosure relates to the field of power supply technologies, and in particular, to a DC-DC based low-voltage power supply method and apparatus, and an electronic device.
Background
Currently, many low-voltage systems require power supply through a DC-DC voltage converter (DC-DC for short). For example, for an electric automobile, after the high voltage on the whole automobile, the power supply of the low-voltage system is switched to DC-DC by the low-voltage storage battery, and after the high voltage on the whole automobile, the low-voltage system is always powered by the DC-DC. Under the condition that electric devices such as vehicle video entertainment, air conditioners and the like which are not necessary for running are turned off, the power of a low-voltage system is low, and the DC-DC works in a low-efficiency area in the state, so that the electric energy conversion efficiency in the low-voltage power supply process is low.
Disclosure of Invention
The invention aims to provide a low-voltage power supply method and device based on DC-DC and electronic equipment, so as to relieve the technical problem of low electric energy conversion efficiency in the low-voltage power supply process.
In a first aspect, embodiments of the present application provide a low-voltage power supply method based on DC-DC, where the DC-DC is used to convert high-voltage electric energy into low-voltage electric energy and supply power to a low-voltage battery and/or a low-voltage load through the low-voltage electric energy; the method comprises the following steps:
calculating the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load;
calculating the actual SOC value of the low-voltage battery by an ampere-hour method according to the current of the low-voltage battery;
adjusting an operating state of the DC-DC based on the actual power and the actual SOC value.
In one possible implementation, the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value includes:
judging the power supply state of the low-voltage system based on the actual power and the actual SOC value;
and adjusting the working state of the DC-DC according to the power supply state of the low-voltage system.
In one possible implementation, the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value includes:
when the actual power is lower than a preset power threshold value and the actual SOC value is higher than a first preset SOC threshold value, adjusting the output voltage of the DC-DC to be lower than the voltage of the low-voltage battery so that the low-voltage battery supplies power to the low-voltage load;
wherein the first preset SOC threshold value is a value determined according to the charging efficiency of the low-voltage battery; the preset power threshold is a value determined according to the operating efficiency of the DC-DC.
In one possible implementation, the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value includes:
and when the actual power is lower than the preset power threshold value and the actual SOC value is lower than the first preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load.
In one possible implementation, the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value includes:
when the actual power is higher than the preset power threshold value and the actual SOC value is lower than a second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load;
wherein the second preset SOC threshold is a value determined according to the charging efficiency of the low-voltage battery, and the second preset SOC threshold is higher than the first preset SOC threshold.
In one possible implementation, the step of adjusting the operating state of the DC-DC based on the power and the SOC value includes:
and when the actual power is higher than the preset power threshold value and the actual SOC value is higher than the second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 12.7V-13.5V so that the current of the low-voltage battery is zero and the DC-DC supplies power to the low-voltage load.
In one possible implementation, the DC-DC is connected in parallel with a voltage sensor, one end of the low-voltage battery is connected in series with a first current sensor, and one end of the low-voltage load is connected in series with a second current sensor; the method further comprises the following steps:
acquiring the voltage of the DC-DC through the voltage sensor;
acquiring the current of the low-voltage load through the first current sensor;
and acquiring the current of the low-voltage battery through the second current sensor.
In a second aspect, a DC-DC based low voltage power supply device is provided, the DC-DC being used for converting high voltage electric energy into low voltage electric energy and supplying power to a low voltage battery and/or a low voltage load by the low voltage electric energy; the device comprises:
the first calculation module is used for calculating the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load;
the second calculation module is used for calculating the actual SOC value of the low-voltage battery through an ampere-hour method according to the current of the low-voltage battery;
and the adjusting module is used for adjusting the working state of the DC-DC based on the actual power and the actual SOC value.
In a third aspect, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and the processor implements the method of the first aspect when executing the computer program.
In a fourth aspect, this embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions, which, when invoked and executed by a processor, cause the processor to perform the method of the first aspect.
The embodiment of the application brings the following beneficial effects:
the embodiment of the application provides a low-voltage power supply method, a device and an electronic device based on a direct current-direct current voltage converter (DC-DC), wherein the DC-DC is used for converting high-voltage electric energy into low-voltage electric energy and supplying power to a low-voltage battery and/or a low-voltage load through the low-voltage electric energy, the method can calculate the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load, further calculate the actual SOC value of the low-voltage battery through an ampere-hour method according to the current of the low-voltage battery, and then adjust the working state of the DC-DC based on the actual power and the actual SOC value, in the scheme, the working state of the DC-DC is adjusted according to the actual power of the low-voltage load and the actual SOC value of the low-voltage battery, so that the efficiency of the DC-DC can be changed along with the power requirement of a low-voltage system, therefore, the conversion efficiency of the DC-DC can be maintained in a high-efficiency area, the working efficiency of the DC-DC is improved, the electric energy conversion efficiency in the low-voltage power supply process is improved, and the technical problem that the electric energy conversion efficiency in the low-voltage power supply process is low is solved.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a graph illustrating efficiency curves of a conventional low voltage power supply;
fig. 2 is a schematic flow chart of a DC-DC based low-voltage power supply method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a DC-DC based low-voltage power supply circuit provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a DC-DC based low-voltage power supply circuit provided in an embodiment of the present application;
FIG. 5 is a graphical illustration of the operating efficiency of DC-DC;
FIG. 6 is a graph illustrating the charging efficiency of a low-voltage battery;
fig. 7 is a schematic structural diagram of a DC-DC based low-voltage power supply circuit provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of a DC-DC based low-voltage power supply circuit provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of a DC-DC based low-voltage power supply circuit provided in an embodiment of the present application;
fig. 10 is a schematic structural diagram of a DC-DC based low-voltage power supply device according to an embodiment of the present application;
fig. 11 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprising" and "having," and any variations thereof, as referred to in the embodiments of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
At present, for an electric automobile, after the high voltage on the whole automobile, a power supply of a low-voltage system is switched to DC-DC by a low-voltage storage battery, and after the high voltage on the whole automobile, the low-voltage system is always powered by the DC-DC. Under the condition that electric devices such as vehicle video entertainment, air conditioning and the like which are not necessary for driving are turned off, as shown in fig. 1, the power of a low-voltage system is low, about 200 to 400W, and the DC-DC in the state works in a low-efficiency area, so that the electric energy conversion efficiency in the low-voltage power supply process is low.
Based on this, the embodiment of the application provides a low-voltage power supply method and device based on DC-DC, and an electronic device, and by the method, the technical problem of low electric energy conversion efficiency in the low-voltage power supply process can be solved.
Embodiments of the present invention are further described below with reference to the accompanying drawings.
Fig. 2 is a schematic flowchart of a low-voltage power supply method based on DC-DC according to an embodiment of the present disclosure. The device can be applied to an electronic control unit, such as a Vehicle Control Unit (VCU) capable of realizing Vehicle control decision. The DC-DC is used to convert high voltage electrical energy into low voltage electrical energy and to power a low voltage battery and/or a low voltage load with the low voltage electrical energy. As shown in fig. 2, the method includes:
and step S210, calculating the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load.
The DC-DC can be used for converting electric energy generated by a power battery or an inverter into 12V low-voltage electric energy and used for charging a low-voltage 12V storage battery or supplying power to vehicle body electrical equipment. And the DC-DC conversion efficiency is defined by the ratio of the DC-DC output power (low side) to the DC-DC input power (high side). The low voltage load may consist of a 12V battery or a DC-DC powered electrical device.
In this step, the VCU may calculate the actual power of the low-voltage load from the voltage sensor and the current sensor at the low-voltage load end, for example, the actual power of the low-voltage load is equal to the voltage value V of the voltage sensor × the current value L2 of the current sensor at the low-voltage load end.
And step S220, calculating the actual SOC value of the low-voltage battery by an ampere-hour method according to the current of the low-voltage battery.
It should be noted that the State of charge (SOC) can be used to reflect the remaining capacity of the battery, and is numerically defined as the ratio of the remaining capacity to the battery capacity, and is usually expressed as a percentage.
In this step, the VCU may calculate the SOC value of the low-voltage battery according to the value of the current sensor at the end of the low-voltage battery and the ampere-hour method.
And step S230, adjusting the working state of the DC-DC based on the actual power and the actual SOC value.
The working state of the DC-DC is adjusted according to the actual power of the low-voltage load and the actual SOC value of the low-voltage battery, and the efficiency of the DC-DC can change along with the power requirement of a low-voltage system during running of a vehicle, so that the conversion efficiency of the DC-DC can be maintained in a high-efficiency area all the time, the working efficiency of the DC-DC is improved, and the high-efficiency working control of the DCDC is realized.
The above steps are described in detail below.
In some embodiments, the DC-DC is connected in parallel with a voltage sensor, one end of the low-voltage battery is connected in series with a first current sensor, and one end of the low-voltage load is connected in series with a second current sensor; the method may further comprise the steps of:
step g), acquiring the voltage of the DC-DC through a voltage sensor;
step h), acquiring the current of the low-voltage load through the first current sensor;
and step i), acquiring the current of the low-voltage battery through a second current sensor.
For example, as shown in FIG. 3, V is a voltage sensor, I1Is a low-voltage battery-side current sensor, i.e. a first current sensor, I2Is a low-voltage load-side current sensor, i.e., a second current sensor. The voltage of the DC-DC, the current of the low-voltage load and the low-voltage battery can be more accurately and conveniently determined through the voltage sensor, the first current sensor and the second current sensor.
In some embodiments, the step S230 may include the following steps:
step a), judging the power supply state of the low-voltage system based on the actual power and the actual SOC value;
and b), adjusting the working state of the DC-DC according to the power supply state of the low-voltage system.
In the embodiment of the present application, the VCU may determine the state of the low-voltage system according to the power of the low-voltage load and the SOC value of the low-voltage battery, and then the VCU may adjust the operating state of the DC-DC according to the state of the low-voltage system. Through the determination of the low-voltage system state, the working state of the DC-DC can be adjusted more accurately.
In some embodiments, the step S230 may include the following steps:
and c), when the actual power is lower than the preset power threshold and the actual SOC value is higher than the first preset SOC threshold, adjusting the output voltage of the DC-DC to be lower than the voltage of the low-voltage battery so as to enable the low-voltage battery to supply power for the low-voltage load.
Wherein the first preset SOC threshold value is a value determined according to the charging efficiency of the low-voltage battery; the preset power threshold is a value determined according to the operating efficiency of DC-DC.
For example, as shown in fig. 4, in the state where the low-voltage load power is lower than P1 and the low-voltage battery SOC is higher than S1, the DC-DC output voltage may be adjusted to a voltage slightly lower than the low-voltage battery (where DC-DC is connected in parallel with the low-voltage battery), so that the low-voltage battery supplies power to the low-voltage system.
Further, for the determination of the preset power threshold, as shown in fig. 5, the low-voltage load power threshold P1 may be determined according to the efficiency curve of DC-DC. In the embodiment of the application, the threshold value can be determined in advance according to the characteristics of different DC-DC devices.
For the determination of the first preset SOC threshold, as shown in fig. 6, a threshold point S1 of the low-voltage battery SOC is determined according to the charging efficiency of the low-voltage lead-acid battery. In the embodiment of the present application, the threshold value may be determined in advance according to the characteristics of different storage batteries.
In the embodiment of the application, the conversion efficiency of the DC-DC can be improved through the power supply switching between the DC-DC and the low-voltage storage battery.
In some embodiments, the step S230 may include the following steps:
and d), when the actual power is lower than the preset power threshold value and the actual SOC value is lower than the first preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load.
For example, as shown in fig. 7, in the second state, when the low-voltage load power is lower than P1 and the low-voltage battery SOC is lower than S1, the DC-DC output voltage is adjusted to 14.5V, so that the DC-DC simultaneously supplies power to the low-voltage system and the low-voltage battery. In the embodiment of the application, the conversion efficiency of the DC-DC can be improved through the power supply switching between the DC-DC and the low-voltage storage battery.
In some embodiments, the step S230 may include the following steps:
step e), when the actual power is higher than the preset power threshold value and the actual SOC value is lower than a second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load;
wherein the second preset SOC threshold is a value determined according to the charging efficiency of the low-voltage battery, and the second preset SOC threshold is higher than the first preset SOC threshold.
For example, as shown in fig. 8, in the third state, when the low-voltage load power is higher than P1 and the low-voltage battery SOC is lower than S2, the DC-DC output voltage is adjusted to 14.5V, so that the DC-DC simultaneously supplies power to the low-voltage system and the low-voltage battery. The conversion efficiency of the DC-DC can be improved through the power supply switching between the DC-DC and the low-voltage storage battery.
Further, for the determination of the second preset SOC threshold, as shown in fig. 6, the threshold point S2 of the low-voltage battery SOC is determined in accordance with the charging efficiency of the low-voltage lead-acid battery. In the embodiment of the present application, the threshold value may be determined in advance according to the characteristics of different storage batteries.
In some embodiments, the step S230 may include the following steps:
and f), when the actual power is higher than the preset power threshold value and the actual SOC value is higher than a second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 12.7V-13.5V so that the current of the low-voltage battery is zero and the DC-DC supplies power to the low-voltage load.
For example, as shown in fig. 9, in the state three, when the low-voltage load power is higher than P1 and the low-voltage battery SOC is higher than S2, the DC-DC output voltage is adjusted to 12.7 to 13.5V, I1 at the battery terminal is 0, and DC-DC supplies power to the low-voltage load.
In the third state, as shown in fig. 8, when the low-voltage load power is higher than P1 and the low-voltage battery SOC is lower than S2, the DC-DC output voltage is adjusted to 14.5V, so that the DC-DC simultaneously supplies power to the low-voltage system and the low-voltage battery. The power supply switching between the DC-DC and the low-voltage storage battery can improve the conversion efficiency of the DC-DC.
Fig. 10 provides a schematic diagram of a DC-DC based low voltage power supply. The device can be applied to VCUs, and the DC-DC is used for converting high-voltage electric energy into low-voltage electric energy and supplying power to a low-voltage battery and/or a low-voltage load through the low-voltage electric energy. As shown in fig. 10, the DC-DC based low voltage power supply apparatus 1000 includes:
a first calculating module 1001, configured to calculate an actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load;
the second calculating module 1002 is configured to calculate an actual SOC value of the low-voltage battery by an ampere-hour method according to the current of the low-voltage battery;
an adjusting module 1003, configured to adjust an operating state of the DC-DC based on the actual power and the actual SOC value.
In some embodiments, the adjusting module 1003 is specifically configured to:
judging the power supply state of the low-voltage system based on the actual power and the actual SOC value;
and adjusting the working state of the DC-DC according to the power supply state of the low-voltage system.
In some embodiments, the adjusting module 1003 is specifically configured to:
when the actual power is lower than a preset power threshold value and the actual SOC value is higher than a first preset SOC threshold value, adjusting the output voltage of the DC-DC to be lower than the voltage of the low-voltage battery so that the low-voltage battery supplies power to the low-voltage load;
wherein the first preset SOC threshold value is a value determined according to the charging efficiency of the low-voltage battery; the preset power threshold is a value determined according to the operating efficiency of the DC-DC.
In some embodiments, the adjusting module 1003 is specifically configured to:
and when the actual power is lower than the preset power threshold value and the actual SOC value is lower than the first preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load.
In some embodiments, the adjusting module 1003 is specifically configured to:
when the actual power is higher than the preset power threshold value and the actual SOC value is lower than a second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load;
wherein the second preset SOC threshold is a value determined according to the charging efficiency of the low-voltage battery, and the second preset SOC threshold is higher than the first preset SOC threshold.
In some embodiments, the adjusting module 1003 is specifically configured to:
and when the actual power is higher than the preset power threshold value and the actual SOC value is higher than the second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 12.7V-13.5V so that the current of the low-voltage battery is zero and the DC-DC supplies power to the low-voltage load.
In some embodiments, the DC-DC is connected in parallel with a voltage sensor, one end of the low-voltage battery is connected in series with a first current sensor, and one end of the low-voltage load is connected in series with a second current sensor; the device also includes:
the acquisition module is used for acquiring the voltage of the DC-DC through the voltage sensor; acquiring the current of the low-voltage load through the first current sensor; and acquiring the current of the low-voltage battery through the second current sensor.
The DC-DC based low voltage power supply device provided by the embodiment of the present application has the same technical features as the DC-DC based low voltage power supply method provided by the above embodiment, so the same technical problems can be solved, and the same technical effects can be achieved.
As shown in fig. 11, an electronic device 1100 according to an embodiment of the present application includes a processor 1102 and a memory 1101, where the memory stores a computer program that is executable on the processor, and the processor implements the steps of the method according to the foregoing embodiment when executing the computer program.
Referring to fig. 11, the electronic device further includes: a bus 1103 and a communication interface 1104, the processor 1102, the communication interface 1104, and the memory 1101 being connected by the bus 1103; the processor 1102 is operable to execute executable modules, such as computer programs, stored in the memory 1101.
The Memory 1101 may include a Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is implemented through at least one communication interface 1104 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like may be used.
The bus 1103 may be an ISA bus, PCI bus, EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 11, but that does not indicate only one bus or one type of bus.
The memory 1101 is used for storing a program, and the processor 1102 executes the program after receiving an execution instruction, and the method performed by the apparatus defined by the process disclosed in any of the foregoing embodiments of the present application may be applied to the processor 1102, or implemented by the processor 1102.
The processor 1102 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1102. The Processor 1102 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1101, and the processor 1102 reads the information in the memory 1101, and completes the steps of the above method in combination with the hardware thereof.
Corresponding to the DC-DC based low voltage power supply method, an embodiment of the present application further provides a computer readable storage medium, which stores computer executable instructions, and when the computer executable instructions are called and executed by a processor, the computer executable instructions cause the processor to execute the steps of the DC-DC based low voltage power supply method.
The DC-DC based low voltage power supply apparatus provided by the embodiment of the present application may be specific hardware on a device, or software or firmware installed on the device, etc. The device provided by the embodiment of the present application has the same implementation principle and technical effect as the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments where no part of the device embodiments is mentioned. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
For another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the DC-DC based low voltage power supply method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the scope of the embodiments of the present application. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (8)

1. The DC-based low-voltage power supply method is characterized in that the DC-DC is used for converting high-voltage electric energy into low-voltage electric energy and supplying power to a low-voltage battery and/or a low-voltage load through the low-voltage electric energy; the method comprises the following steps:
calculating the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load;
calculating the actual SOC value of the low-voltage battery by an ampere-hour method according to the current of the low-voltage battery;
adjusting an operating state of the DC-DC based on the actual power and the actual SOC value;
the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value includes:
when the actual power is lower than a preset power threshold value and the actual SOC value is higher than a first preset SOC threshold value, adjusting the output voltage of the DC-DC to be lower than the voltage of the low-voltage battery so that the low-voltage battery supplies power to the low-voltage load;
wherein the first preset SOC threshold value is a value determined according to the charging efficiency of the low-voltage battery; the preset power threshold is a value determined according to the working efficiency of the DC-DC;
the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value includes:
when the actual power is higher than the preset power threshold value and the actual SOC value is lower than a second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load;
wherein the second preset SOC threshold is a value determined according to the charging efficiency of the low-voltage battery, and the second preset SOC threshold is higher than the first preset SOC threshold.
2. The DC-DC based low voltage power supply method of claim 1, wherein the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value comprises:
judging the power supply state of the low-voltage system based on the actual power and the actual SOC value;
and adjusting the working state of the DC-DC according to the power supply state of the low-voltage system.
3. The DC-DC based low voltage power supply method of claim 1, wherein the step of adjusting the operating state of the DC-DC based on the actual power and the actual SOC value comprises:
and when the actual power is lower than the preset power threshold value and the actual SOC value is lower than the first preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load.
4. The DC-DC based low voltage power supply method of claim 1, wherein said step of adjusting the operating state of said DC-DC based on said power and said SOC value comprises:
and when the actual power is higher than the preset power threshold value and the actual SOC value is higher than the second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 12.7V-13.5V so that the current of the low-voltage battery is zero and the DC-DC supplies power to the low-voltage load.
5. The DC-based low voltage power supply method according to claim 1, wherein the DC-DC is connected in parallel with a voltage sensor, one end of the low voltage battery is connected in series with a first current sensor, and one end of the low voltage load is connected in series with a second current sensor; the method further comprises the following steps:
acquiring the voltage of the DC-DC through the voltage sensor;
acquiring the current of the low-voltage load through the second current sensor;
and acquiring the current of the low-voltage battery through the first current sensor.
6. A DC-based low-voltage power supply device, wherein the DC-DC is configured to convert high-voltage electric energy into low-voltage electric energy and supply power to a low-voltage battery and/or a low-voltage load through the low-voltage electric energy; the device comprises:
the first calculation module is used for calculating the actual power of the low-voltage load according to the voltage of the DC-DC and the current of the low-voltage load;
the second calculation module is used for calculating the actual SOC value of the low-voltage battery through an ampere-hour method according to the current of the low-voltage battery;
an adjustment module for adjusting the operating state of the DC-DC based on the actual power and the actual SOC value;
the adjustment module is specifically configured to:
when the actual power is lower than a preset power threshold value and the actual SOC value is higher than a first preset SOC threshold value, adjusting the output voltage of the DC-DC to be lower than the voltage of the low-voltage battery so that the low-voltage battery supplies power to the low-voltage load;
wherein the first preset SOC threshold value is a value determined according to the charging efficiency of the low-voltage battery; the preset power threshold is a value determined according to the working efficiency of the DC-DC;
the adjustment module is further configured to:
when the actual power is higher than the preset power threshold value and the actual SOC value is lower than a second preset SOC threshold value, adjusting the output voltage of the DC-DC to be 14.5V so that the DC-DC can simultaneously supply power for the low-voltage battery and the low-voltage load;
wherein the second preset SOC threshold is a value determined according to the charging efficiency of the low-voltage battery, and the second preset SOC threshold is higher than the first preset SOC threshold.
7. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 5 when executing the computer program.
8. A computer readable storage medium having stored thereon computer executable instructions which, when invoked and executed by a processor, cause the processor to execute the method of any of claims 1 to 5.
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