CN113965093A - DC-DC converter circuit and operating method - Google Patents
DC-DC converter circuit and operating method Download PDFInfo
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- CN113965093A CN113965093A CN202111567049.1A CN202111567049A CN113965093A CN 113965093 A CN113965093 A CN 113965093A CN 202111567049 A CN202111567049 A CN 202111567049A CN 113965093 A CN113965093 A CN 113965093A
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- power supply
- voltage
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- vehicle
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Embodiments of the present disclosure provide a DC-DC converter circuit and method of operation. The circuit comprises a high-voltage battery, a charging relay, a DC-DC vehicle-mounted charging power supply, a low-voltage battery and a control module; the high-voltage battery is connected with the input end of the DC-DC vehicle-mounted charging power supply through the charging relay; the low-voltage battery is connected with the output end of the DC-DC vehicle-mounted charging power supply; the control module is used for controlling the running mode of the DC-DC vehicle-mounted charging power supply; the operation modes include a forward operation mode and a reverse operation mode. In this way, the current surge caused by the charging relay closing is reduced without adding an additional pre-charging circuit.
Description
Technical Field
Embodiments of the present disclosure relate generally to the field of electronics, and more particularly, to DC-DC conversion circuits and methods of operation.
Background
In new energy vehicles, DC-DC is a device that converts high voltage DC power to low voltage DC power. The new energy automobile is not provided with an engine, and the power source of the whole automobile is not a generator or a storage battery, but a power battery or a storage battery. Because the rated voltage of the electric appliances of the whole vehicle is low voltage, a DC-DC device is needed to convert high-voltage direct current into low-voltage direct current, so that the electric balance of the whole vehicle can be kept.
The DC-DC vehicle-mounted charging power supply module is a key component for converting high voltage electricity into low voltage electricity in the new energy automobile, wherein the high-voltage battery provides input for the operation of the DC-DC vehicle-mounted charging power supply module. Before the DC-DC vehicle-mounted charging power supply module operates every time, a charging relay between the high-voltage battery and the DC-DC vehicle-mounted charging power supply module needs to be closed first, and due to the fact that the voltage difference between the two sides of the charging relay is extremely large and basically is the voltage of the high-voltage battery, the charging relay can be directly closed to generate large impact current, and although the duration time is extremely short, certain risk can still be generated.
To solve the problem, in the prior art, an additional pre-charging circuit is added as shown in fig. 1, the circuit and a main loop charging relay are used in a time-sharing manner, before a DC-DC vehicle-mounted charging power supply module operates, the pre-charging circuit works first, and after voltage at an input side of the DC-DC vehicle-mounted charging power supply module is established, the charging relay of the main loop is closed and the pre-charging circuit is opened.
Disclosure of Invention
In a first aspect of the present disclosure, a DC-DC conversion circuit is provided. The circuit includes:
the system comprises a high-voltage battery, a charging relay, a DC-DC vehicle-mounted charging power supply, a low-voltage battery and a control module;
the high-voltage battery is connected with the input end of the DC-DC vehicle-mounted charging power supply through the charging relay; the low-voltage battery is connected with the output end of the DC-DC vehicle-mounted charging power supply;
the control module is used for controlling the running mode of the DC-DC vehicle-mounted charging power supply; the operation modes include a forward operation mode and a reverse operation mode.
Further, the DC-DC vehicle-mounted charging power supply is an LLC circuit and comprises a primary side, a first isolation transformer, a second isolation transformer and a secondary side; wherein the content of the first and second substances,
the primary is a full bridge circuit, including: the direct current input source comprises a direct current input source, a first bridge arm switching tube consisting of PWM2A and PWM2B, a second bridge arm switching tube consisting of PWM3A and PWM3B, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor;
the primary sides of the first isolation transformer and the second isolation transformer are connected in series, and the secondary sides are connected in parallel;
the secondary is a rectifying circuit consisting of PWM4A, PWM5A and an output filter capacitor;
PWM2A, PWM2B, PWM3A, PWM3B, PWM4A, and PWM5A are MOSFETs.
And further, the working state of the secondary rectification circuit is controlled by a driving control chip according to a comparison result of the secondary current/primary current of the transformer flowing through 0 and the on-off state of the MOSFET of the primary full-bridge circuit, and a driving signal is generated according to a preset rule to control, and the driving signal is used for switching on and/or off the secondary MOSFET of the LLC circuit through the driving circuit.
Further, the DC-DC vehicle-mounted charging power supply comprises a voltage detection module used for detecting the input side voltage of the DC-DC vehicle-mounted charging power supply.
In a second aspect of the present disclosure, a method of operating a DC-DC conversion circuit is provided. The method comprises the following steps:
the control module receives a starting-up instruction, starts a reverse running mode of the DC-DC vehicle-mounted charging power supply, and establishes an input side voltage at an input end of the DC-DC vehicle-mounted charging power supply;
and after the voltage at the input side is established, the charging relay is closed, the forward operation mode of the DC-DC vehicle-mounted charging power supply is started through the control module, and the high-voltage battery charges the low-voltage battery.
Further, the establishing the input side voltage at the input terminal of the DC-DC vehicle charging power supply comprises:
and establishing an input side voltage at the input end of the DC-DC vehicle charging power supply through the electric energy of the low-voltage battery.
Further, after the input side voltage is established, closing the charging relay includes:
after the input side voltage is established, detecting the input side voltage through a voltage detection module in the DC-DC vehicle-mounted charging power supply;
and if the difference value between the voltage of the input side and the voltage of the high-voltage battery is smaller than a threshold value, closing the charging relay.
Further, if the value of the input side voltage is 0, the low-voltage battery is judged to be in fault, and the operation of the DC-DC vehicle-mounted charging power supply is stopped.
According to the DC-DC conversion circuit and the working method provided by the embodiment of the application, a control module receives a starting-up instruction, a reverse running mode of the DC-DC vehicle-mounted charging power supply is started, and an input side voltage is established at the input end of the DC-DC vehicle-mounted charging power supply; after the input side voltage is established, the charging relay is closed, the forward operation mode of the DC-DC vehicle-mounted charging power supply is started through the control module, the high-voltage battery charges the low-voltage battery, and current impact caused by closing of the charging relay is reduced under the condition that an additional pre-charging circuit is not added.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 shows a prior art DC-DC converter circuit schematic;
FIG. 2 shows a DC-DC conversion circuit schematic according to an embodiment of the disclosure;
FIG. 3 is a block diagram of an LLC circuit of an embodiment of the disclosure;
fig. 4 shows a flow chart of a method of operation of a DC-DC conversion circuit according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Fig. 2 shows a DC-DC conversion circuit schematic according to an embodiment of the disclosure.
In some embodiments, the DC-DC conversion circuit comprises a high voltage battery, a charging relay, a DC-DC onboard charging power supply, a low voltage battery, and a control module;
the high-voltage battery is connected with the input end of the DC-DC vehicle-mounted charging power supply through the charging relay; the low-voltage battery is connected with the output end of the DC-DC vehicle-mounted charging power supply;
the control module is used for controlling the running mode of the DC-DC vehicle-mounted charging power supply; the operation modes comprise a forward operation mode and a reverse operation mode;
the forward running mode is that the voltage of a high-voltage battery is converted into the voltage of a low-voltage battery through the DC-DC vehicle-mounted charging power supply, and the low-voltage battery is charged;
the reverse operation mode is that the voltage of the low-voltage battery is converted into the voltage of the high-voltage battery through the DC-DC vehicle-mounted charging power supply.
In some embodiments, the DC-DC onboard charging power supply is an LLC circuit, and includes a primary, a first isolation transformer, a second isolation transformer, and a secondary. Wherein the content of the first and second substances,
the primary is a full bridge circuit, mainly includes: the direct current input source comprises a first bridge arm switching tube consisting of PWM2A and PWM2B, a second bridge arm switching tube consisting of PWM3A and PWM3B, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor.
The primary sides of the first isolation transformer and the second isolation transformer are connected in series, and the secondary sides are connected in parallel.
And the secondary side is a rectifying circuit consisting of PWM4A, PWM5A and an output filter capacitor.
In some embodiments, drains of the PWM2A and the PWM3B are connected to an anode of the input dc source, sources of the PWM2A and the PWM3B are connected to drains of the PWM2B and the PWM3A, respectively, sources of the PWM2B and the PWM3A are connected to a cathode of the input dc source, one end of the resonant inductor Lr is connected to the source of the PWM2A and the drain of the PWM2B, and the other end of the resonant inductor Lr is connected to one end of the excitation inductor Lm and the first isolation transformer T1And a second isolation transformer T2One end of the primary side of the resonant capacitor Cr is connected with the source electrode of PWM3B and the drain electrode of PWM3A after being connected in series, and the other end of the resonant capacitor Cr is connected with the other end of the excitation inductor and the other end of the primary side of the first isolation transformer and the other end of the secondary side of the second isolation transformer after being connected in series.
In some embodiments, the first isolation transformer is connected in parallel with the secondary side of the second isolation transformer, one end of the secondary side of the first isolation transformer is connected to the drain of the PWM4A, and one end of the secondary side of the first isolation transformer is connected to one end of the secondary side of the second isolation transformer and to one end of the output filter capacitor Co; the other end of the secondary side of the second isolation transformer is connected with the drain electrode of the PWM 5A; the source of PWM4A is connected to the source of PWM5A and to the other end of the output filter capacitor.
In some embodiments, PWM2A, PWM2B, PWM3A, PWM3B, PWM4A, PWM5A are MOSFETs.
In some embodiments, the operating state of the secondary rectification circuit is controlled by a driving control chip according to the comparison result of the secondary side current/primary side current of the transformer flowing through 0 and the on and off states of the MOSFET of the primary full bridge circuit, and a driving signal is generated according to a preset rule to control, and the driving signal turns on and/or off the secondary MOSFET of the LLC circuit via the driving circuit.
In some embodiments, the DC-DC onboard charging power supply comprises a voltage detection module for detecting an input side voltage of the DC-DC onboard charging power supply, i.e. detecting an input side voltage generated at the input of the DC-DC onboard charging power supply by a low voltage battery.
As shown in fig. 4, the present application also discloses a method of operating by the above DC-DC conversion circuit, including:
s401, a control module receives a starting instruction, starts a reverse running mode of the DC-DC vehicle-mounted charging power supply, and establishes input side voltage at an input end of the DC-DC vehicle-mounted charging power supply.
Receiving a starting-up instruction through a control module;
and after receiving a starting instruction, the control module starts a reverse operation mode of the DC-DC vehicle-mounted charging power supply, and establishes an input side voltage at an input end of the DC-DC vehicle-mounted charging power supply through the electric energy of the low-voltage battery, namely, the control module starts the reverse operation mode of the DC-DC vehicle-mounted charging power supply and converts the voltage of the low-voltage battery into the voltage of the high-voltage battery.
S402, after the input side voltage is built, a charging relay is closed, a control module is used for starting a forward running mode of the DC-DC vehicle-mounted charging power supply, and a high-voltage battery is used for charging a low-voltage battery.
Detecting the value of the input side voltage through a voltage detection module in the DC-DC vehicle-mounted charging power supply, closing the charging relay if the difference value between the value of the input side voltage and the voltage of the high-voltage battery is smaller than a threshold value, starting a forward operation mode of the DC-DC vehicle-mounted charging power supply through a control module, and charging the low-voltage battery through the high-voltage battery; the threshold value can be determined according to the rated input voltage and the rated output voltage of the DC-DC vehicle-mounted charging power supply, for example, 2, and the threshold value is optimal when being equal to 0, namely, the value of the input side voltage is equal to the voltage value of the high-voltage battery, and the current impact caused by the closing of the charging relay is approximately equal to 0 and can be ignored;
and if the value of the input side voltage is 0, judging that the low-voltage battery has a fault, and stopping the operation of the DC-DC vehicle-mounted charging power supply.
According to the embodiment of the disclosure, the following technical effects are achieved:
to the impulse current problem that the charging relay closure leads to on the circuit between high-voltage battery and the on-vehicle charging power module of DCDC, traditional scheme of increasing other extra hardware circuit (pre-charge circuit) has been abandoned to this application, has designed the reverse operation mode of the on-vehicle charging power module of DCDC, under the condition that does not increase extra pre-charge circuit, has reduced the electric current impact that the charging relay closure arouses.
It is noted that while for simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present disclosure is not limited by the order of acts, as some steps may, in accordance with the present disclosure, occur in other orders and concurrently. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that acts and modules referred to are not necessarily required by the disclosure.
Further, while operations are depicted in a particular order, this should be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (8)
1. A DC-DC conversion circuit is characterized by comprising a high-voltage battery, a charging relay, a DC-DC vehicle-mounted charging power supply, a low-voltage battery and a control module;
the high-voltage battery is connected with the input end of the DC-DC vehicle-mounted charging power supply through the charging relay; the low-voltage battery is connected with the output end of the DC-DC vehicle-mounted charging power supply;
the control module is used for controlling the running mode of the DC-DC vehicle-mounted charging power supply; the operation modes include a forward operation mode and a reverse operation mode.
2. The circuit of claim 1, wherein the DC-DC onboard charging power supply is an LLC circuit comprising a primary, a first and a second isolation transformer, a secondary; wherein the content of the first and second substances,
the primary is a full bridge circuit, including: the direct current input source comprises a direct current input source, a first bridge arm switching tube consisting of PWM2A and PWM2B, a second bridge arm switching tube consisting of PWM3A and PWM3B, and an LLC resonance tank consisting of a resonance capacitor, a resonance inductor and an excitation inductor;
the primary sides of the first isolation transformer and the second isolation transformer are connected in series, and the secondary sides are connected in parallel;
the secondary is a rectifying circuit consisting of PWM4A, PWM5A and an output filter capacitor;
PWM2A, PWM2B, PWM3A, PWM3B, PWM4A, and PWM5A are MOSFETs.
3. The circuit of claim 2, wherein the operating state of the secondary rectifying circuit is controlled by a driving control chip according to the comparison result of the secondary current/primary current of the transformer flowing through 0 and the on and off states of the MOSFETs of the primary full bridge circuit, and a driving signal is generated according to a predetermined rule, and the driving signal is used to turn on and/or off the secondary MOSFET of the LLC circuit via the driving circuit.
4. The circuit of claim 3, wherein the DC-DC onboard charging power supply further comprises a voltage detection module configured to detect an input side voltage of the DC-DC onboard charging power supply.
5. A method of operating a DC-DC converter circuit according to any of claims 1 to 4, comprising:
the control module receives a starting-up instruction, starts a reverse running mode of the DC-DC vehicle-mounted charging power supply, and establishes an input side voltage at an input end of the DC-DC vehicle-mounted charging power supply;
and after the voltage at the input side is established, the charging relay is closed, the forward operation mode of the DC-DC vehicle-mounted charging power supply is started through the control module, and the high-voltage battery charges the low-voltage battery.
6. The method of claim 5, wherein establishing the input side voltage at the input of the DC-DC onboard charging power supply comprises:
and establishing an input side voltage at the input end of the DC-DC vehicle charging power supply through the electric energy of the low-voltage battery.
7. The method of claim 6, wherein closing the charging relay after the input side voltage build-up is complete comprises:
after the input side voltage is established, detecting the input side voltage through a voltage detection module in the DC-DC vehicle-mounted charging power supply;
and if the difference value between the voltage of the input side and the voltage of the high-voltage battery is smaller than a threshold value, closing the charging relay.
8. The method according to claim 7, wherein if the value of the input-side voltage is 0, it is determined that the low-voltage battery is faulty, and the operation of the DC-DC vehicle-mounted charging power supply is stopped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111567049.1A CN113965093A (en) | 2021-12-21 | 2021-12-21 | DC-DC converter circuit and operating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111567049.1A CN113965093A (en) | 2021-12-21 | 2021-12-21 | DC-DC converter circuit and operating method |
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| CN202111567049.1A Pending CN113965093A (en) | 2021-12-21 | 2021-12-21 | DC-DC converter circuit and operating method |
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Cited By (1)
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| CN114268213A (en) * | 2022-03-01 | 2022-04-01 | 常州索维尔电子科技有限公司 | Soft switching circuit based on LLC circuit, control method and control device |
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Application publication date: 20220121 |