CN113612266A - Constant power control circuit, constant power control method and electric appliance - Google Patents
Constant power control circuit, constant power control method and electric appliance Download PDFInfo
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- CN113612266A CN113612266A CN202110701452.2A CN202110701452A CN113612266A CN 113612266 A CN113612266 A CN 113612266A CN 202110701452 A CN202110701452 A CN 202110701452A CN 113612266 A CN113612266 A CN 113612266A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 10
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 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
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- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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Abstract
The invention relates to a constant power control circuit, a constant power control method and an electric appliance. The power supply battery in the constant power control circuit is connected with the control chip through the battery management system, and the battery management system collects the real-time battery voltage of the power supply battery and sends the real-time battery voltage to the control chip; the power supply battery is connected with the load through the load driving circuit and supplies power to the load through the load driving circuit; the control chip is connected with the load driving circuit and used for adjusting the power supply current of the load driving circuit to the load; the control chip is connected with the load through the current sampling circuit, the current sampling circuit collects real-time working current of the load and transmits the real-time working current to the control chip, and the control chip adjusts power supply current of the load driving circuit according to real-time battery voltage so that power obtained by the real-time battery voltage and the real-time working current is kept constant. According to the invention, after a bus voltage detection circuit is removed, the hardware cost can be reduced, the voltage detection precision is improved, the peripheral resources of the MCU are reduced, and the code amount is reduced.
Description
Technical Field
The invention relates to the field of power control of electric appliances, in particular to a constant power control circuit, a constant power control method and an electric appliance.
Background
Constant power control is a common control function in an electrical appliance control system, and in the prior art, a resistance voltage division mode is used for obtaining the bus power supply voltage, and then the controller MCU detects the bus power supply voltage. According to the method, an independent voltage detection circuit is needed to collect the bus voltage, so that the hardware cost of the circuit is increased; meanwhile, the voltage division circuit is easy to be interfered by the outside, the higher the bus voltage is, the larger the voltage division ratio is, and the lower the MCU detection precision is; in addition, the method also needs to occupy an ADC port of the controller MCU, and the software code amount is also increased.
Disclosure of Invention
The present invention provides a constant power control circuit, a constant power control method and an electrical appliance, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the constant power control circuit is constructed and comprises a control chip, a battery management system, a load driving circuit, a power supply battery, a load and a current sampling circuit;
the power supply battery is connected with the control chip through the battery management system, and the battery management system collects the real-time battery voltage of the power supply battery and sends the real-time battery voltage to the control chip; the power supply battery is connected with the load through the load driving circuit, and the power supply battery supplies power to the load through the load driving circuit; the control chip is connected with the load driving circuit and adjusts the power supply current of the load driving circuit to the load;
the control chip is connected with the load through the current sampling circuit, the current sampling circuit collects real-time working current of the load and transmits the real-time working current to the control chip, and the control chip adjusts the power supply current of the load driving circuit according to the real-time battery voltage so that the real-time battery voltage and the power obtained by the real-time working current are kept constant.
Further, in the constant power control circuit of the present invention, the power supply battery includes at least two battery cells, and the battery management system collects a real-time battery cell voltage of each battery cell;
calculating the sum of the real-time cell voltages of all the cells by the battery management system to obtain the real-time battery voltage; or, the battery management system sends the real-time cell voltages of all the cells to the control chip, and the control chip calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
Further, in the constant power control circuit of the present invention, the power supply battery includes at least two battery cell groups, the battery management system includes at least two battery management modules, and each battery cell group is connected to the control chip through a corresponding battery management module;
the battery management module collects the real-time voltage of the electric core groups and sends the real-time voltage to the control chip, and the control chip calculates the sum of the real-time voltage of the electric core groups to obtain the real-time battery voltage.
Further, in the constant power control circuit of the present invention, each of the electric core groups includes at least two electric cores, the battery management module collects real-time electric core voltages corresponding to all the electric cores in the electric core group, and the real-time electric core group voltage of the electric core group is obtained from a sum of the real-time electric core voltages of all the electric cores in the electric core group.
Further, in the constant power control circuit of the present invention, the load is a motor, and the load driving circuit is a motor driving circuit.
Further, in the constant power control circuit of the present invention, the model of the control chip is STSPIN32F 0B;
the battery management system comprises a battery management chip with the model number OZ 3708.
In addition, the invention also provides a constant power control method, which is applied to the constant power control circuit and comprises the following steps:
s1, the battery management system collects the real-time battery voltage of the power supply battery and sends the real-time battery voltage to the control chip; the control chip acquires the real-time working current of the load through the current acquisition circuit;
and S2, the control chip adjusts the power supply current of the load driving circuit according to the real-time battery voltage so as to keep the power obtained by the real-time battery voltage and the real-time working current constant.
Further, in the constant power control method of the present invention, the power supply battery includes at least two battery cells, and the step S1 of acquiring the real-time battery voltage of the power supply battery by the battery management system includes:
the battery management system collects the real-time cell voltage of each cell, and the battery management system calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
Further, in the constant power control method of the present invention, the power supply battery includes at least two battery cells, and the step S1 of acquiring the real-time battery voltage of the power supply battery by the battery management system includes: the battery management system collects real-time cell voltage of each cell;
the step S1 of sending the real-time battery voltage to a control chip includes: and the battery management system sends the real-time cell voltages of all the cells to the control chip, and the control chip calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
Further, in the constant power control method of the present invention, the power supply battery includes at least two battery cell groups, the battery management system includes at least two battery management modules, and each battery cell group is connected to the control chip through one battery management module; the step S1 of the battery management system acquiring the real-time battery voltage of the power supply battery includes:
the battery management module collects the real-time voltage of the electric core groups and sends the real-time voltage to the control chip, and the control chip calculates the sum of the real-time voltage of the electric core groups to obtain the real-time battery voltage.
In addition, the invention also provides an electric appliance which comprises the constant power control circuit.
The constant power control circuit, the constant power control method and the electric appliance have the following beneficial effects that: according to the invention, after a bus voltage detection circuit is removed, the hardware cost can be reduced, the voltage detection precision is improved, the peripheral resources of the MCU are reduced, and the code amount is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a constant power control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of the control chip 10 according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a battery management system 20 according to an embodiment of the present invention;
fig. 4 is a circuit diagram of the load driving circuit 30 according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a current sampling circuit 60 according to an embodiment of the present invention;
fig. 6 is a flowchart of a constant power control method according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the constant power control circuit of this embodiment includes a control chip 10, a battery management system 20, a load driving circuit 30, a power supply battery 40, a load 50, and a current sampling circuit 60, where the power supply battery 40 is connected to the control chip 10 through the battery management system 20, and the battery management system 20 collects a real-time battery voltage of the power supply battery 40 and sends the real-time battery voltage to the control chip 10. The power supply battery 40 is connected to the load 50 through the load driving circuit 30, and the power supply battery 40 supplies power to the load 50 through the load driving circuit 30. The control chip 10 is connected to the load driving circuit 30, and can adjust a supply current of the load driving circuit 30 to the load 50. The control chip 10 is connected to the load 50 through the current sampling circuit 60, and the current sampling circuit 60 collects the real-time working current of the load 50 and transmits the real-time working current to the control chip 10. The control chip 10 calculates the real-time power according to the real-time battery voltage and the real-time working current, because the real-time battery voltage is the attribute of the power supply battery 40, the control chip 10 cannot control the real-time battery voltage output value, but the real-time battery voltage output by the power supply battery 40 is continuously changed, and in order to maintain the real-time power fixed at a certain power value, the control chip 10 needs to adjust the power supply current of the load driving circuit 30 according to the real-time battery voltage, so that the power obtained by the real-time battery voltage and the real-time working current is kept constant. It can be understood that the real-time battery voltage is a primary variable, the real-time working current is a secondary variable, and the control chip 10 adjusts the real-time working current according to the variation of the real-time battery voltage.
Alternatively, the load 50 is a motor and the load driving circuit 30 is a motor driving circuit.
According to the embodiment, after the bus voltage detection circuit is removed, the hardware cost can be reduced, the voltage detection precision is improved, the peripheral resources of the MCU are reduced, and the code amount is reduced.
In the constant power control circuit of some embodiments, the power supply battery 40 is a single-package battery, that is, the power supply battery 40 includes at least two battery cells, the battery management system 20 is connected to each battery cell, and the battery management system 20 collects a real-time cell voltage of each battery cell. The present embodiment provides two ways to calculate the real-time battery voltage:
the first calculation method: after the battery management system 20 obtains the real-time cell voltage of each cell, the battery management system 20 calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage, and then the battery management system 20 sends the real-time battery voltage to the control chip 10. In the calculation method, the battery management system 20 is used for calculating the battery voltage in real time, so that the data processing amount of the control chip 10 can be reduced.
The second calculation method: the battery management system 20 does not perform calculation after obtaining the real-time cell voltage of each cell, the battery management system 20 sends the real-time cell voltages of all the cells to the control chip 10, and the control chip 10 calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage. The calculation method is used for finishing the real-time battery voltage calculation by the control chip 10, and the data processing amount of the battery management system 20 can be reduced.
This embodiment provides two real-time battery voltage calculation methods for a single-package battery, and a preferred embodiment can be selected according to system settings or hardware parameters.
In the constant power control circuit of some embodiments, the power supply battery 40 is a multi-pack battery, that is, the power supply battery 40 includes at least two battery cell groups 401, the battery management system 20 includes at least two battery management modules 201, each battery cell group 401 is connected to the control chip 10 through a corresponding battery management module 201, that is, the number of the battery cell groups 401 and the number of the battery management modules 201 are the same, and each battery cell group 401 corresponds to one battery management module 201. Each electric core group 401 comprises at least two electric cores, the battery management module 201 collects real-time electric core voltages of all the electric cores in the corresponding electric core group 401, and the real-time electric core group voltage of the electric core group 401 is obtained by the sum of the real-time electric core voltages of all the electric cores in the electric core group 401. Then, the battery management module 201 collects the real-time electric core group voltages corresponding to the electric core groups 401 and sends the real-time electric core group voltages to the control chip 10, and the control chip 10 calculates the sum of the real-time electric core group voltages of all the electric core groups 401 to obtain the real-time battery voltage.
In some embodiments of the constant power control circuit, the control chip 10 is model number ststspin 32F0B, and referring to fig. 2, is STSPIN32F0B chip and its peripheral circuits. Referring to fig. 3, the battery management system 20 includes a battery management chip having a model OZ3708 and peripheral circuits thereof, the battery management chip OZ3708 may connect a plurality of battery cells, and a circuit diagram of the battery management chip OZ3708 connecting the plurality of battery cells is shown in fig. 3. Referring to fig. 4, a circuit diagram of the load driving circuit 30 is shown. Referring to fig. 5, a circuit diagram of the current sampling circuit 60 is shown.
In a preferred embodiment, referring to fig. 6, the constant power control method of the present embodiment is applied to the constant power control circuit of the above-mentioned embodiment, and includes the following steps:
s1, the battery management system 20 collects the real-time battery voltage of the power supply battery 40, and sends the real-time battery voltage to the control chip 10; the control chip 10 collects the real-time operating current of the load 50 through the current collecting circuit 60.
S2, the control chip 10 adjusts the supply current of the load driving circuit 30 according to the real-time battery voltage, so that the power obtained by the real-time battery voltage and the real-time operating current is kept constant. Because the real-time battery voltage is the attribute of the power supply battery 40, the control chip 10 cannot control the real-time battery voltage output value, but the real-time battery voltage output by the power supply battery 40 is constantly changed, and in order to maintain the real-time power fixed at a certain power value, the control chip 10 needs to adjust the power supply current of the load driving circuit 30 according to the real-time battery voltage, so that the power obtained by the real-time battery voltage and the real-time working current is kept constant. It can be understood that the real-time battery voltage is a primary variable, the real-time working current is a secondary variable, and the control chip 10 adjusts the real-time working current according to the variation of the real-time battery voltage.
According to the embodiment, after the bus voltage detection circuit is removed, the hardware cost can be reduced, the voltage detection precision is improved, the peripheral resources of the MCU are reduced, and the code amount is reduced.
In the constant power control method of some embodiments, the power supply battery 40 includes at least two battery cells, and the step S1 of the battery management system 20 acquiring the real-time battery voltage of the power supply battery 40 includes: the battery management system 20 collects the real-time cell voltages of each cell, and the battery management system 20 calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
In the constant power control method of some embodiments, the power supply battery 40 includes at least two battery cells, and the step S1 of the battery management system 20 acquiring the real-time battery voltage of the power supply battery 40 includes: the battery management system 20 collects the real-time cell voltage of each cell. The step S1 of sending the real-time battery voltage to the control chip 10 includes: the battery management system 20 sends the real-time cell voltages of all the cells to the control chip 10, and the control chip 10 calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
In the constant power control method of some embodiments, the power supply battery 40 includes at least two battery packs 401, the battery management system 20 includes at least two battery management modules 201, and each battery pack 401 is connected to the control chip 10 through one battery management module 201. The step S1 in which the battery management system 20 collects the real-time battery voltage of the power supply battery 40 includes: the battery management module 201 collects the real-time cell group voltage of the corresponding cell group 401 and sends the real-time cell group voltage to the control chip 10, and the control chip 10 calculates the sum of the real-time cell group voltages of all the cell groups 401 to obtain the real-time battery voltage.
In a preferred embodiment, the electric appliance of the present embodiment includes the constant power control circuit as in the above embodiments, and the electric appliance of the present embodiment is powered by a battery.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (11)
1. The constant-power control circuit is characterized by comprising a control chip (10), a battery management system (20), a load driving circuit (30), a power supply battery (40), a load (50) and a current sampling circuit (60);
the power supply battery (40) is connected with the control chip (10) through the battery management system (20), and the battery management system (20) collects the real-time battery voltage of the power supply battery (40) and sends the real-time battery voltage to the control chip (10); the power supply battery (40) is connected with the load (50) through the load driving circuit (30), and the power supply battery (40) supplies power to the load (50) through the load driving circuit (30); the control chip (10) is connected with the load driving circuit (30) and adjusts the power supply current of the load driving circuit (30) to the load (50);
the control chip (10) is connected with the load (50) through the current sampling circuit (60), the current sampling circuit (60) collects the real-time working current of the load (50) and transmits the real-time working current to the control chip (10), and the control chip (10) adjusts the power supply current of the load driving circuit (30) according to the real-time battery voltage so as to maintain the power obtained by the real-time battery voltage and the real-time working current constant.
2. The constant power control circuit according to claim 1, wherein the power supply battery (40) comprises at least two cells, and the battery management system (20) collects a real-time cell voltage of each of the cells;
calculating the sum of the real-time cell voltages of all the cells by the battery management system (20) to obtain the real-time battery voltage; or the battery management system (20) sends the real-time cell voltages of all the cells to the control chip (10), and the control chip (10) calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
3. The constant-power control circuit according to claim 1, wherein the power supply battery (40) comprises at least two battery pack groups (401), the battery management system (20) comprises at least two battery management modules (201), and each battery pack group (401) is connected to the control chip (10) through a corresponding battery management module (201);
the battery management module (201) collects the real-time electric core group voltage corresponding to the electric core group (401) and sends the real-time electric core group voltage to the control chip (10), and the control chip (10) calculates the sum of the real-time electric core group voltage of all the electric core groups (401) to obtain the real-time battery voltage.
4. The constant power control circuit according to claim 3, wherein each of the cell packs (401) comprises at least two cells, the battery management module (201) collects real-time cell voltages corresponding to all the cells in the cell pack (401), and the real-time cell pack voltage of the cell pack (401) is obtained by the sum of the real-time cell voltages of all the cells in the cell pack (401).
5. The constant power control circuit according to claim 1, wherein the load (50) is a motor and the load driving circuit (30) is a motor driving circuit.
6. The constant power control circuit according to claim 1, wherein the control chip (10) is of a type STSPIN32F 0B;
the battery management system (20) includes a battery management chip model OZ 3708.
7. A constant power control method applied to the constant power control circuit according to any one of claims 1 to 6, the method comprising the steps of:
s1, the battery management system (20) collects the real-time battery voltage of the power supply battery (40) and sends the real-time battery voltage to the control chip (10); the control chip (10) collects the real-time working current of the load (50) through a current collecting circuit (60);
s2, the control chip (10) adjusts the power supply current of the load driving circuit (30) according to the real-time battery voltage, so that the power obtained by the real-time battery voltage and the real-time working current is kept constant.
8. The constant-power control method according to claim 7, wherein the power supply battery (40) comprises at least two battery cells, and the step S1 of the battery management system (20) acquiring the real-time battery voltage of the power supply battery (40) comprises:
the battery management system (20) collects the real-time cell voltage of each cell, and the battery management system (20) calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
9. The constant-power control method according to claim 7, wherein the power supply battery (40) comprises at least two battery cells, and the step S1 of the battery management system (20) acquiring the real-time battery voltage of the power supply battery (40) comprises: the battery management system (20) collects a real-time cell voltage for each of the cells;
the step S1 of sending the real-time battery voltage to a control chip (10) includes: the battery management system (20) sends the real-time cell voltages of all the cells to the control chip (10), and the control chip (10) calculates the sum of the real-time cell voltages of all the cells to obtain the real-time battery voltage.
10. The constant power control method according to claim 7, wherein the power supply battery (40) comprises at least two battery pack groups (401), the battery management system (20) comprises at least two battery management modules (201), and each battery pack group (401) is connected with the control chip (10) through one battery management module (201); the step S1 in which the battery management system (20) collects the real-time battery voltage of the power supply battery (40) includes:
the battery management module (201) collects the real-time electric core group voltage corresponding to the electric core group (401) and sends the real-time electric core group voltage to the control chip (10), and the control chip (10) calculates the sum of the real-time electric core group voltage of all the electric core groups (401) to obtain the real-time battery voltage.
11. An electrical appliance, characterized in that the electrical appliance comprises a constant power control circuit according to any of claims 1 to 6.
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| CN202110701452.2A CN113612266A (en) | 2021-06-23 | 2021-06-23 | Constant power control circuit, constant power control method and electric appliance |
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| CN202110701452.2A CN113612266A (en) | 2021-06-23 | 2021-06-23 | Constant power control circuit, constant power control method and electric appliance |
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| CN115635851A (en) * | 2022-10-31 | 2023-01-24 | 重庆长安新能源汽车科技有限公司 | Vehicle-mounted intelligent power distribution system, control method and storage medium |
| CN115635851B (en) * | 2022-10-31 | 2024-06-04 | 深蓝汽车科技有限公司 | Vehicle-mounted intelligent power distribution system, control method and storage medium |
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