CN109177780B - Charging control method and device and electric automobile - Google Patents

Charging control method and device and electric automobile Download PDF

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Publication number
CN109177780B
CN109177780B CN201811148922.1A CN201811148922A CN109177780B CN 109177780 B CN109177780 B CN 109177780B CN 201811148922 A CN201811148922 A CN 201811148922A CN 109177780 B CN109177780 B CN 109177780B
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voltage
value
working frequency
direct current
conversion unit
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CN109177780A (en
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孟江涛
蒋荣勋
苏伟
刘立志
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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    • H02J7/045—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the invention provides a charging control method and device and an electric automobile. The charging control method comprises the following steps: the charging control module determines a first working frequency value according to a difference value between a voltage set value and a voltage feedback value of the high-voltage battery; the charging control module determines a second working frequency value according to the difference value between the voltage set value and the voltage feedback value of the input voltage of the voltage reduction unit; the charging control module determines a third working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery; and the charging control module determines the working frequency of the components in the direct current/direct current conversion unit according to the first working frequency value, the second working frequency value and the third working frequency value, and controls the components in the direct current/direct current conversion unit to work according to the working frequency. In the embodiment of the invention, the normal charging of the high-voltage battery is ensured, and the normal charging of the low-voltage battery is also ensured.

Description

Charging control method and device and electric automobile
Technical Field
The embodiment of the invention relates to the technical field of automobiles, in particular to a charging control method and device and an electric automobile.
Background
At present, a vehicle-mounted power supply of an electric vehicle mainly comprises a vehicle-mounted charger power supply module and a vehicle-mounted direct-current voltage conversion module. However, with the increasingly strict requirements on the weight, cost and space of the electric automobile, the integrated vehicle-mounted power supply is produced. As shown in fig. 1, for the integrated vehicle-mounted power supply, a single transformer (i.e., transformer T1 in the figure) is used to charge the high-voltage battery and the low-voltage battery simultaneously. When the high-voltage battery and the low-voltage battery are charged by the unified vehicle-mounted power supply, the switching tubes M5-M8 are turned on, and energy is transmitted to the high-voltage battery and the low-voltage battery through the transformer TI. The high-voltage side winding of the transformer is used as a main output, and the low-voltage side winding of the transformer is used as an auxiliary output. However, the conventional integrated vehicle-mounted power supply has a problem that when the high-voltage battery is fully charged, the switching tubes M5-M8 are closed, so that the low-voltage battery cannot be normally charged.
Disclosure of Invention
The embodiment of the invention provides a charging control method and device and an electric automobile, and aims to solve the problem that an integrated vehicle-mounted power supply in the prior art cannot continue to charge a low-voltage battery normally after a high-voltage battery is charged.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to an aspect of the embodiments of the present invention, there is provided a charging control method applied to an integrated vehicle-mounted power supply, where the integrated vehicle-mounted power supply includes: the charging circuit is electrically connected with the charging control module;
wherein the charging circuit comprises: a power factor correction unit; the direct current/direct current conversion unit is electrically connected with the power factor correction unit, and a high-voltage output end of the direct current/direct current conversion unit is electrically connected with a high-voltage battery of the automobile; the voltage reduction unit is electrically connected with the low-voltage output end of the direct current/direct current conversion unit, and the output end of the voltage reduction unit is electrically connected with a low-voltage battery of the automobile;
wherein the charging control module is electrically connected with the power factor correction unit, the DC/DC conversion unit, the voltage reduction unit, the high-voltage battery and the low-voltage battery, respectively;
the charging control method comprises the following steps:
the charging control module determines a first working frequency value according to the difference value between the voltage set value and the voltage feedback value of the high-voltage battery;
the charging control module determines a second working frequency value according to the difference value between the voltage set value and the voltage feedback value of the input voltage of the voltage reduction unit;
the charging control module determines a third working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery;
and the charging control module determines the working frequency of the components in the DC/DC conversion unit according to the first working frequency value, the second working frequency value and the third working frequency value, and controls the components in the DC/DC conversion unit to work according to the working frequency.
Further, determining the operating frequency of the component in the dc/dc conversion unit according to the first operating frequency value, the second operating frequency value, and the third operating frequency value, includes:
taking the working frequency value with the larger value of the first working frequency value and the second working frequency value as a reference working frequency;
and determining the working frequency value with a smaller value in the reference working frequency and the third working frequency value as the working frequency of the component in the direct current/direct current conversion unit.
Further, the voltage setting value of the input voltage of the voltage reduction unit is less than or equal to the voltage value calculated by the lowest voltage of the high-voltage battery according to the transformation ratio value of the transformer in the direct current/direct current conversion unit.
According to another aspect of the embodiments of the present invention, there is provided a charging control device applied to an integrated vehicle-mounted power supply, including: the charging circuit is electrically connected with the charging control module;
wherein the charging circuit comprises: a power factor correction unit; the direct current/direct current conversion unit is electrically connected with the power factor correction unit, and a high-voltage output end of the direct current/direct current conversion unit is electrically connected with a high-voltage battery of the automobile; the voltage reduction unit is electrically connected with the low-voltage output end of the direct current/direct current conversion unit, and the output end of the voltage reduction unit is electrically connected with a low-voltage battery of the automobile;
wherein the charging control module is electrically connected with the power factor correction unit, the DC/DC conversion unit, the voltage reduction unit, the high-voltage battery and the low-voltage battery, respectively;
wherein the charge control device includes:
the first adjusting module is used for determining a first working frequency value according to the difference value between the voltage set value and the voltage feedback value of the high-voltage battery by the charging control module;
the second adjusting module is used for determining a second working frequency value according to the difference value between the voltage set value and the voltage feedback value of the input voltage of the voltage reduction unit by the charging control module;
the third adjusting module is used for determining a third working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery by the charging control module;
and the control module is used for determining the working frequency of the components in the direct current/direct current conversion unit according to the first working frequency value, the second working frequency value and the third working frequency value and controlling the components in the direct current/direct current conversion unit to work according to the working frequency.
Further, the control module includes:
the first control unit is used for taking the working frequency value with the larger value of the first working frequency value and the second working frequency value as a reference working frequency;
and the second control unit is used for determining the working frequency value with the smaller value of the reference working frequency and the third working frequency value as the working frequency of the component in the direct current/direct current conversion unit.
Further, the voltage setting value of the input voltage of the voltage reduction unit is less than or equal to the voltage value calculated by the lowest voltage of the high-voltage battery according to the transformation ratio value of the transformer in the direct current/direct current conversion unit.
According to another aspect of an embodiment of the present invention, there is provided a microcontroller including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the charging control method as described above.
According to another aspect of the embodiments of the present invention, there is provided an electric vehicle including the charge control device as described above.
The invention has the beneficial effects that:
in the embodiment of the invention, the loop regulation strategy is arranged on the high-voltage side and the loop regulation strategy is arranged on the low-voltage side, and the charging condition of the high-voltage side and the charging condition of the low-voltage side are considered, so that the normal charging of the high-voltage battery can be ensured, and the normal charging of the low-voltage battery can also be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 shows a circuit topology diagram of an integrated vehicle power supply according to an embodiment of the invention;
fig. 2 is a flowchart illustrating a charging control method according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a charging control method according to an embodiment of the present invention;
fig. 4 is a block diagram of a charge control device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to an aspect of the embodiment of the invention, a charging control method is provided, which is applied to an integrated vehicle-mounted power supply.
Wherein, this integration vehicle mounted power includes: the charging circuit and be used for controlling the charging control module that the charging circuit charges. The charging control module is electrically connected with the charging circuit.
Specifically, as shown in fig. 1, the charging circuit includes: a power factor correction unit (i.e., a PFC (power factor correction) unit), a DC/DC conversion unit (i.e., a DC/DC conversion unit) electrically connected to the PFC unit, and a voltage reduction unit (i.e., a BUCK unit) electrically connected to a low voltage output terminal of the DC/DC conversion unit. The charging control module is respectively electrically connected with the PFC unit, the DC/DC conversion unit, the BUCK unit, the high-voltage battery E1 of the automobile and the low-voltage battery E2 of the automobile so as to control the charging circuit to charge the high-voltage battery and the low-voltage battery.
The PFC unit is used for converting alternating-current voltage input by a live wire (L) and a zero wire (N) into stable direct-current voltage and providing stable direct-current voltage for the DC/DC conversion unit.
The DC/DC conversion unit is used for converting the direct-current voltage output by the PFC unit into adjustable direct-current voltage, charging the high-voltage battery and providing input voltage for the BUCK unit. The input end of the DC/DC conversion unit is electrically connected with the output end of the PFC unit, the high-voltage output end of the DC/DC conversion unit is electrically connected with the high-voltage battery, and the low-voltage output end of the DC/DC conversion unit is electrically connected with the BUCK unit.
The BUCK unit is used for reducing voltage, charging a low-voltage battery and supplying power to a low-voltage system. The input end of the BUCK unit is electrically connected with the low-voltage output end of the DC/DC conversion unit, and the output end of the BUCK unit is electrically connected with the low-voltage battery.
Specifically, as shown in fig. 1, in the embodiment of the present invention, the DC/DC conversion unit includes:
the circuit comprises a first switch tube M1, a second switch tube M2, a third switch tube M3, a fourth switch tube M4, a fifth switch tube M5, a sixth switch tube M6, a seventh switch tube M7, an eighth switch tube M8, a first inductor L1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first diode D1, a second diode D2D2 and a transformer T1.
The drain of the first switch tube M1 is electrically connected to the positive output terminal of the PFC unit, and the source of the first switch tube M1 is electrically connected to the drain of the second switch tube M2. The source electrode of the second switching tube M2 is electrically connected with the negative output end of the PFC unit. The drain of the third switching tube M3 is electrically connected to the drain of the first switching tube M1, and the source of the third switching tube M3 is electrically connected to the drain of the fourth switching tube M4. The source of the fourth switching tube M4 is electrically connected to the source of the second switching tube M2. A first end of the first inductor L1 is electrically connected to the source of the third switching tube M3 and the drain of the fourth switching tube M4, respectively, and a second end of the first inductor L1 is electrically connected to the transformer T1. The first end of the first capacitor is electrically connected to the source of the first switch transistor M1 and the drain of the second switch transistor M2, respectively, and the second end of the first capacitor C1 is electrically connected to the transformer T1. The high-voltage side winding of the transformer T1 is electrically connected to the source of the fifth switching tube M5 and the drain of the sixth switching tube M6, respectively. The source of the fifth switch tube M5 is electrically connected to the drain of the sixth switch tube M6, and the drain of the fifth switch tube M5 is electrically connected to the drain of the seventh switch tube M7. The source of the sixth switching tube M6 is electrically connected to the source of the eighth switching tube M8. The drain of the seventh switching tube M7 is further connected to the high-voltage positive output terminal of the DC/DC conversion unit, and the source of the seventh switching tube M7 is electrically connected to the drain of the eighth switching tube M8. The source of the eighth switching tube M8 is also electrically connected to the high voltage negative output terminal of the DC/DC conversion unit. A first end of the second capacitor C2 is connected to the high-voltage winding of the transformer T1, and a second end of the second capacitor C2 is electrically connected to the source of the seventh switch tube M7 and the drain of the eighth switch tube M8, respectively. The cathode of the first diode D1 is electrically connected to the low-voltage winding of the transformer T1, and the anode of the first diode D1 is electrically connected to the second end of the third capacitor C3. The cathode of the second diode D2 is electrically connected to the low-voltage winding of the transformer T1, and the anode of the second diode D2 is electrically connected to the second end of the third capacitor C3. The low side winding of transformer T1 is also electrically connected to a first terminal of a third capacitor C3. The first end of the third capacitor C3 is also electrically connected to the low voltage positive input of the DC/DC conversion unit, and the second end of the third capacitor C3 is also electrically connected to the low voltage negative input of the DC/DC conversion unit.
An embodiment of the present invention provides a charging control method for the integrated vehicle-mounted power supply, as shown in fig. 2, the charging control method includes:
step 201, the charging control module determines a first working frequency value according to a difference between a voltage set value and a voltage feedback value of the high-voltage battery.
The voltage setting value of the high-voltage battery described herein is a preset voltage value, and is generally equal to the highest voltage value of the high-voltage battery. The voltage feedback value of the high-voltage battery described herein is an actual voltage value of the high-voltage battery.
The charging condition of the high-voltage battery can be reflected through the difference value between the voltage set value and the voltage feedback value of the high-voltage battery. For example, if the difference between the voltage setting value and the voltage feedback value of the high-voltage battery is greater than 0 (i.e., the voltage feedback value is less than the voltage setting value), it indicates that the high-voltage battery is not fully charged, and at this time, the charging control module outputs a working frequency value having a value greater than 0 according to the loop regulation strategy and according to the difference between the voltage setting value and the voltage feedback value of the high-voltage battery, so as to control the charging circuit to continue to charge the high-voltage battery; if the difference value between the voltage set value and the voltage feedback value of the high-voltage battery is equal to 0 (namely, the voltage feedback value is equal to the voltage set value), the high-voltage battery is fully charged, and at this moment, the charging control module outputs a working frequency value with a value equal to 0 according to the loop regulation strategy and the difference value between the voltage set value and the voltage feedback value of the high-voltage battery, so as to control the charging circuit to stop charging the high-voltage battery.
The first working frequency value may be used to adjust the working frequency of the components in the DC/DC conversion unit, so that the components in the DC/DC conversion unit perform charging operation according to the first working frequency.
Step 202, the charging control module determines a second working frequency value according to a difference value between a voltage set value and a voltage feedback value of the input voltage of the BUCK unit.
The input voltage of the BUCK unit (hereinafter, referred to as voltage V1) is calculated by a transformation ratio of a transformer in the DC/DC conversion unit, and for example, if the high-side battery voltage is 300V and the number of turns of a high-side winding and a low-side winding of the transformer (i.e., transformation ratio) is 20:1, the voltage V1 is 15V.
The voltage set value of the voltage V1 is a preset voltage value, and is generally smaller than a voltage value calculated from a transformation ratio value of a transformer in the DC/DC conversion unit based on the maximum voltage of the high-voltage battery and larger than the maximum voltage value of the low-voltage battery. The voltage feedback value of the voltage V1 described herein is the actual voltage value of the voltage V1.
If the difference between the voltage setting value and the voltage feedback value of the voltage V1 is greater than 0 (i.e., the voltage feedback value is less than the voltage setting value), the charging control module outputs a working frequency value having a value greater than 0 according to the loop regulation strategy and the difference between the voltage setting value and the voltage feedback value of the voltage V1, so as to control the charging circuit to continue charging the low-voltage battery. If the difference between the voltage setting value and the voltage feedback value of the voltage V1 is equal to 0 (i.e., the voltage feedback value is equal to the voltage setting value), the charging control module outputs a working frequency value with a value equal to 0 according to the loop regulation strategy and the difference between the voltage setting value and the voltage feedback value of the voltage V1, so as to control the charging circuit to stop charging the low-voltage battery.
The second operating frequency value may also be used to adjust the operating frequency of the components in the DC/DC conversion unit, so that the components in the DC/DC conversion unit perform charging operation according to the second operating frequency.
And 203, the charging control module determines a third working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery.
The current setting value of the high-voltage battery is a preset current value, and is generally equal to the highest current value of the high-voltage battery. The current feedback value of the high-voltage battery described herein is an actual current value of the high-voltage battery. The charging control module can determine a working frequency value according to a loop regulation strategy and a difference value between a current set value and a current feedback value of the high-voltage battery, and the charging current of the high-voltage battery is limited through the working frequency value.
The third operating frequency value may also be used to adjust the operating frequency of the components in the DC/DC conversion unit, so that the components in the DC/DC conversion unit perform charging operation according to the third operating frequency.
And 204, the charging control module determines the working frequency of the components in the DC/DC conversion unit according to the first working frequency value, the second working frequency value and the third working frequency value, and controls the components in the DC/DC conversion unit to work according to the working frequency.
In the embodiment of the invention, according to a loop regulation strategy, a working frequency value (namely, a first working frequency value) is determined according to a difference value between a voltage set value and a voltage feedback value of a high-voltage battery, a working frequency value (namely, a second working frequency value) is determined according to a difference value between a voltage set value and a voltage feedback value of a voltage VI, a working frequency value (namely, a third working frequency value) is determined according to a difference value between a current set value and a current feedback value of the high-voltage battery, then, according to the three determined working frequency values, the working frequency of components in the DC/DC conversion unit is determined, and the components in the DC/DC conversion unit are controlled to perform charging operation according to the working frequency.
In the embodiment of the invention, not only is a loop regulation strategy arranged on the high-voltage side (namely, a working frequency value is determined according to the difference value between the voltage set value and the voltage feedback value of the high-voltage battery and a working frequency value is determined according to the difference value between the current set value and the current feedback value of the high-voltage battery), but also a loop regulation strategy is arranged on the low-voltage side (namely, a working frequency value is determined according to the difference value between the voltage set value and the voltage feedback value of the input voltage of the BUCK unit).
It should be noted that, for the step 201 to the step 203, the steps are not necessarily executed in sequence in the specific implementation, and the three steps may be executed in sequence or simultaneously according to the actual requirement, and the specific situation may be designed according to the actual situation, which is not limited in the embodiment of the present invention.
It should be further noted that, for the loop regulation strategy described in the embodiment of the present invention, the larger the difference between the voltage (current) set value and the voltage (current) feedback value is, the larger the output working frequency value is, and conversely, the smaller the output working frequency value is.
Further, in the embodiment of the present invention, determining the operating frequency of the component in the dc/dc conversion unit according to the first operating frequency value, the second operating frequency value, and the third operating frequency value includes:
taking the working frequency value with the larger value of the first working frequency value and the second working frequency value as the reference working frequency; and determining the working frequency value with a smaller value in the reference working frequency and the third working frequency value as the working frequency of the component in the direct current/direct current conversion unit.
For a better understanding of the foregoing, reference is made to FIG. 3 as an example.
In the embodiment of the invention, three loop regulation strategies are provided, namely loop1, loop2 and loop 3. The loop1 is used for outputting a working frequency value according to the difference between the voltage set value and the voltage feedback value of the high-voltage battery. The loop2 is used for outputting a working frequency value according to the difference between the voltage set value and the voltage feedback value of the voltage V1. The loop3 is used for outputting a working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery.
It is assumed that the minimum voltage of the high-voltage battery is 300V, the maximum voltage is 400V, and the voltage setting value is 400V. The ratio of the number of turns of the high-voltage side winding to the low-voltage side winding (i.e., the transformation ratio) of the transformer in the DC/DC conversion unit is 20: 1. The voltage setting of the voltage V1 was 15V. The maximum voltage of the low-voltage battery is 14V.
When the high-voltage battery is charged, the voltage feedback value of the voltage V1 is larger than or equal to 15V, and the BUCK unit can charge the 14V low-voltage battery. At this time, since the voltage feedback value of the voltage V1 is greater than or equal to the voltage set value, the operating frequency value output by the loop2 is the smallest (generally 0). And the voltage set value of the high-voltage battery is greater than the voltage feedback value, so the working frequency value output by the loop1 is not 0. After the working frequency values output by the loop1 and the loop2 are increased, the working frequency value output by the loop1 is selected.
In order to limit the charging current of the high-voltage battery, the working frequency value output by the selected loop1 and the working frequency value (not 0) output by the loop3 according to the difference value between the current set value and the current feedback value of the high-voltage battery are smaller, and the finally selected working frequency value is used as the working frequency of the components in the DC/DC conversion unit. Because the last selected working frequency value is not 0, the switching tubes M5-M8 are in an open state, and the charging circuit can charge the high-voltage battery and the low-voltage battery.
When the high-voltage battery is fully charged, the voltage set value of the high-voltage battery is equal to the voltage feedback value, and the working frequency value output by the loop1 is adjusted to be minimum (generally 0). At this time, the voltage setting value of the voltage V1 is smaller than the voltage feedback value (the voltage feedback value is 20V at this time according to the transformation ratio), so the working frequency value output by the loop2 is also adjusted to be minimum (generally 0). After the working frequency values output by the loop1 and the loop2 are increased, the selected working frequency value is 0, and when the working frequency value output by the loop3 is decreased, and the selected working frequency value is 0 finally, the switching tubes M5-M8 are closed, and energy cannot be transmitted. The voltage of the transformer drops due to the energy being unable to be transmitted, and the voltage value of the voltage V1 also drops along with the voltage drop of the transformer. When the voltage value of the voltage V1 is reduced to be smaller than the voltage set value of the voltage V1, the working frequency value output by the loop2 is larger than 0, and after the working frequency values output by the loop1 and the loop2 are increased, the working frequency value output by the loop2 is selected. After the working frequency values (not 0) output by the selected loop2 and the loop3 are continuously reduced, the finally selected working frequency value is used as the working frequency of the components in the DC/DC conversion unit, and the switching tubes M5-M8 are in an open state because the finally selected working frequency value is not 0, and the charging circuit can continuously charge the low-voltage battery.
Preferably, since the high-voltage battery is fully charged at this time, there is no need to continue charging, and therefore, in order to avoid continuing charging the high-voltage battery at this time, the voltage setting value of the voltage V1 may be set to be less than or equal to the voltage value calculated from the transformation ratio value of the transformer in the DC/DC conversion unit for the lowest voltage of the high-voltage battery. Since the voltage feedback value of the voltage V1 is 15V at maximum, the voltage of the transformer is 300V at maximum, and the voltage of the high-voltage battery is greater than 300V, so that the high-voltage battery is not charged.
In summary, in the embodiment of the present invention, the loop regulation strategy is set on both the high-voltage side and the low-voltage side, and both the charging condition of the high-voltage side and the charging condition of the low-voltage side are considered, so that not only the normal charging of the high-voltage battery but also the normal charging of the low-voltage battery can be ensured.
According to another aspect of the embodiment of the invention, a charging control device is provided and applied to an integrated vehicle-mounted power supply. The charging control device can realize the details of the charging control method and achieve the same effect.
Wherein, this integration vehicle mounted power includes: the charging circuit and the charging control module are electrically connected with the charging circuit.
Wherein, the charging circuit includes: a power factor correction unit; the high-voltage output end of the direct current/direct current conversion unit is electrically connected with a high-voltage battery of the automobile; and the output end of the voltage reduction unit is electrically connected with a low-voltage battery of the automobile.
The charging control module is respectively electrically connected with the power factor correction unit, the direct current/direct current conversion unit, the voltage reduction unit, the high-voltage battery and the low-voltage battery.
As shown in fig. 4, the charge control device includes:
the first adjusting module 401 is configured to determine a first working frequency value according to a difference between a voltage setting value and a voltage feedback value of the high-voltage battery.
The second adjusting module 402 is configured to determine a second working frequency value according to a difference between a voltage setting value and a voltage feedback value of the input voltage of the voltage dropping unit.
And a third adjusting module 403, configured to determine a third working frequency value according to a difference between the current set value and the current feedback value of the high-voltage battery.
And the control module 404 is configured to determine a working frequency of the component in the dc/dc conversion unit according to the first working frequency value, the second working frequency value, and the third working frequency value, and control the component in the dc/dc conversion unit to work according to the working frequency.
Further, the control module 404 includes:
and the first control unit is used for taking the working frequency value with the larger value of the first working frequency value and the second working frequency value as the reference working frequency.
And the second control unit is used for determining the working frequency value with a smaller value in the reference working frequency and the third working frequency value as the working frequency of the component in the direct current/direct current conversion unit.
Further, the voltage setting value of the input voltage of the voltage reducing unit is less than or equal to the voltage value calculated by the lowest voltage of the high-voltage battery according to the transformation ratio value of the transformer in the DC/DC conversion unit.
In summary, in the embodiment of the present invention, the loop regulation strategy is set on both the high-voltage side and the low-voltage side, and both the charging condition of the high-voltage side and the charging condition of the low-voltage side are considered, so that not only the normal charging of the high-voltage battery but also the normal charging of the low-voltage battery can be ensured.
According to another aspect of an embodiment of the present invention, there is provided a microcontroller including: a memory, a processor, and a computer program stored on the memory and executable on the processor. Which computer program, when being executed by a processor, carries out the steps of the charging control method as described above.
According to another aspect of an embodiment of the present invention, there is provided a computer-readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the charging control method as described above.
According to another aspect of the embodiments of the present invention, there is provided an electric vehicle including the charge control device as described above.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (6)

1. A charging control method is applied to an integrated vehicle-mounted power supply, and the integrated vehicle-mounted power supply comprises the following steps: the charging circuit is electrically connected with the charging control module;
wherein the charging circuit comprises: a power factor correction unit; the direct current/direct current conversion unit is electrically connected with the power factor correction unit, and a high-voltage output end of the direct current/direct current conversion unit is electrically connected with a high-voltage battery of the automobile; the voltage reduction unit is electrically connected with the low-voltage output end of the direct current/direct current conversion unit, and the output end of the voltage reduction unit is electrically connected with a low-voltage battery of the automobile;
wherein the charging control module is electrically connected with the power factor correction unit, the DC/DC conversion unit, the voltage reduction unit, the high-voltage battery and the low-voltage battery, respectively;
the charging control method is characterized by comprising the following steps:
the charging control module determines a first working frequency value according to the difference value between the voltage set value and the voltage feedback value of the high-voltage battery;
the charging control module determines a second working frequency value according to the difference value between the voltage set value and the voltage feedback value of the input voltage of the voltage reduction unit;
the charging control module determines a third working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery;
the charging control module determines the working frequency of the components in the DC/DC conversion unit according to the first working frequency value, the second working frequency value and the third working frequency value, and controls the components in the DC/DC conversion unit to work according to the working frequency;
wherein, the working frequency value with the larger value in the first working frequency value and the second working frequency value is used as the reference working frequency;
and determining the working frequency value with a smaller value in the reference working frequency and the third working frequency value as the working frequency of the component in the direct current/direct current conversion unit.
2. The method according to claim 1, wherein the voltage setting value of the input voltage of the voltage reducing unit is less than or equal to a voltage value calculated from a transformation ratio value of a transformer in the dc/dc conversion unit for the lowest voltage of the high voltage battery.
3. The utility model provides a charge control device, is applied to integration vehicle mounted power supply, integration vehicle mounted power supply includes: the charging circuit is electrically connected with the charging control module;
wherein the charging circuit comprises: a power factor correction unit; the direct current/direct current conversion unit is electrically connected with the power factor correction unit, and a high-voltage output end of the direct current/direct current conversion unit is electrically connected with a high-voltage battery of the automobile; the voltage reduction unit is electrically connected with the low-voltage output end of the direct current/direct current conversion unit, and the output end of the voltage reduction unit is electrically connected with a low-voltage battery of the automobile;
wherein the charging control module is electrically connected with the power factor correction unit, the DC/DC conversion unit, the voltage reduction unit, the high-voltage battery and the low-voltage battery, respectively;
characterized in that, the charge control device includes:
the first adjusting module is used for determining a first working frequency value according to the difference value between the voltage set value and the voltage feedback value of the high-voltage battery by the charging control module;
the second adjusting module is used for determining a second working frequency value according to the difference value between the voltage set value and the voltage feedback value of the input voltage of the voltage reduction unit by the charging control module;
the third adjusting module is used for determining a third working frequency value according to the difference value between the current set value and the current feedback value of the high-voltage battery by the charging control module;
the control module is used for determining the working frequency of the components in the direct current/direct current conversion unit according to the first working frequency value, the second working frequency value and the third working frequency value and controlling the components in the direct current/direct current conversion unit to work according to the working frequency; wherein the control module comprises:
the first control unit is used for taking the working frequency value with the larger value of the first working frequency value and the second working frequency value as a reference working frequency;
and the second control unit is used for determining the working frequency value with the smaller value of the reference working frequency and the third working frequency value as the working frequency of the component in the direct current/direct current conversion unit.
4. The apparatus according to claim 3, wherein the voltage setting value of the input voltage of the voltage reducing unit is less than or equal to a voltage value calculated from a transformation ratio value of a transformer in the DC/DC converting unit, the lowest voltage of the high voltage battery.
5. A microcontroller, characterized by a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the charge control method according to any one of claims 1 to 2.
6. An electric vehicle characterized by comprising the charge control device according to any one of claims 3 to 4.
CN201811148922.1A 2018-09-29 2018-09-29 Charging control method and device and electric automobile Active CN109177780B (en)

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