CN114301288A - Three-way direct-current electric energy conversion circuit and three-way direct-current electric energy conversion device - Google Patents
Three-way direct-current electric energy conversion circuit and three-way direct-current electric energy conversion device Download PDFInfo
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Abstract
The invention is suitable for the technical field of switching power supplies, and particularly relates to a three-way direct-current electric energy conversion circuit and a three-way direct-current electric energy conversion device, wherein the three-way direct-current electric energy conversion circuit comprises a first bidirectional power conversion circuit, a second bidirectional power conversion circuit, a third bidirectional power conversion circuit and a controller, the controller outputs switch control signals to the first bidirectional power conversion circuit, the second bidirectional power conversion circuit and the third bidirectional power conversion circuit to realize bidirectional charging and discharging of a first battery pack, a second battery pack and a high-voltage power module in pairs, when one power module is out of power, the power module can be charged through any one of the other two power modules, and therefore energy flowing and sharing between high voltage and low voltage and between low voltage and high voltage are realized.
Description
Technical Field
The invention belongs to the technical field of switching power supplies, and particularly relates to a three-way direct-current electric energy conversion circuit and a three-way direct-current electric energy conversion device.
Background
At present, two paths of direct current energy conversion circuits are formed by a traditional battery (low voltage) through a high voltage power module (a charging and discharging circuit or a bidirectional AC/DC module and the like) to perform bidirectional charging or discharging, for example, a charging pile charges the battery, but the charging and discharging energy conversion between low voltage and low voltage is difficult to directly satisfy through circuit conversion, for example, an electric automobile can only charge through the charging pile, and can not perform bidirectional charging and discharging through a battery on another electric automobile, and the energy sharing can not be achieved.
Disclosure of Invention
The invention aims to provide a three-way direct current power conversion circuit, and aims to solve the problem that the traditional two-way direct current power conversion circuit has abnormal load operation caused by the abnormal operation of one power module.
A first aspect of an embodiment of the present invention provides a three-way dc power conversion circuit, where the three-way dc power conversion circuit includes a first bidirectional power conversion circuit, a second bidirectional power conversion circuit, a third bidirectional power conversion circuit, and a controller;
the first bidirectional power conversion circuit is respectively connected with the second bidirectional power conversion circuit and the third bidirectional power conversion circuit and used for connecting a first battery pack, the second bidirectional power conversion circuit is also connected with the third bidirectional power conversion circuit and used for connecting a second battery pack, the third bidirectional power conversion circuit is also used for connecting a high-voltage power supply module, and the controller is respectively electrically connected with the first bidirectional power conversion circuit, the second bidirectional power conversion circuit and the third bidirectional power conversion circuit;
the controller is configured to output a switch control signal to the first bidirectional power conversion circuit, the second bidirectional power conversion circuit, and the third bidirectional power conversion circuit, so that the first battery pack, the second battery pack, and the high-voltage power module are charged and/or discharged correspondingly between each two of the first battery pack, the second battery pack, and the high-voltage power module.
In one embodiment, the first bidirectional power conversion circuit includes a first switch circuit, a second switch circuit, a third switch circuit, and a first buck-boost circuit;
a first terminal of the first switching circuit is for connecting the positive electrode of the first battery pack, a second terminal of the first switching circuit, a first terminal of the second switching circuit, and a first power supply terminal of the first buck-boost circuit are interconnected, a second terminal of the second switching circuit, a second power supply terminal of the first buck-boost circuit and a first power supply terminal of the third bidirectional power conversion circuit are interconnected, a first terminal of the third switching circuit is for connection to a negative electrode of the first battery pack, a second terminal of the third switching circuit, a third power supply terminal of the first buck-boost circuit, and a second power supply terminal of the third bidirectional power conversion circuit are interconnected, the controlled end of the first switch circuit, the controlled end of the second switch circuit, the controlled end of the third switch circuit and the controlled end of the first buck-boost circuit are also respectively connected with the signal end of the controller.
In one embodiment, the second bidirectional power conversion circuit includes a fourth switching circuit, a fifth switching circuit, a sixth switching circuit, and a second buck-boost circuit;
a first terminal of the fourth switching circuit is used for connecting the anode of the second battery pack, a second terminal of the fourth switching circuit, a first terminal of the fifth switching circuit and a first power supply terminal of the second buck-boost circuit are interconnected, a second terminal of the fifth switching circuit, a second power supply terminal of the second buck-boost circuit, and a first power supply terminal of the third bidirectional power conversion circuit are interconnected, a first terminal of the sixth switching circuit is used for connecting a negative electrode of the second battery pack, a second terminal of the sixth switching circuit, a third power supply terminal of the second buck-boost circuit and a second power supply terminal of the third bidirectional power conversion circuit are interconnected, the controlled end of the fourth switch circuit, the controlled end of the fifth switch circuit, the controlled end of the sixth switch circuit and the controlled end of the second buck-boost circuit are also respectively connected with the signal end of the controller.
In one embodiment, the first bidirectional power conversion circuit further includes a first pre-charge circuit and a seventh switch circuit;
the first power end of the first pre-charge circuit, the first end of the seventh switch circuit and the first end of the first switch circuit are interconnected, the second power end of the first pre-charge circuit, the second end of the seventh switch circuit and the second end of the second switch circuit are interconnected, and the controlled end of the first pre-charge circuit and the controlled end of the seventh switch circuit are further respectively connected with the signal end of the controller.
In one embodiment, the second bidirectional power conversion circuit further includes a second precharge circuit and an eighth switch circuit;
the first power end of the second pre-charge circuit, the first end of the eighth switch circuit and the first end of the fifth switch circuit are interconnected, the second power end of the second pre-charge circuit, the second end of the eighth switch circuit and the second end of the sixth switch circuit are interconnected, and the controlled end of the second pre-charge circuit and the controlled end of the eighth switch circuit are further respectively connected with the signal end of the controller.
In one embodiment, the first buck-boost circuit comprises a first inductor, a first capacitor, a first MOS transistor and a second MOS transistor;
the first end of the first inductor and the first end of the first capacitor are connected in common to form a first power supply end of the first boost-buck circuit, the second end of the first inductor, the output end of the first MOS transistor and the input end of the second MOS transistor are interconnected, the input end of the first MOS transistor forms a second power supply end of the first boost-buck circuit, the second end of the first capacitor and the output end of the second MOS transistor are connected in common to form a third power supply end of the first boost-buck circuit, and the controlled end of the first MOS transistor and the controlled end of the second MOS transistor are further connected with a signal end of the controller respectively.
In one embodiment, the second buck-boost circuit comprises a second inductor, a second capacitor, a third MOS transistor and a fourth MOS transistor;
the first end of the second inductor and the first end of the second capacitor are connected in common to form a first power supply end of the second buck-boost circuit, the second end of the second inductor, the output end of the third MOS transistor and the input end of the fourth MOS transistor are interconnected, the input end of the third MOS transistor forms a second power supply end of the second buck-boost circuit, the second end of the second capacitor and the output end of the fourth MOS transistor are connected in common to form a third power supply end of the second buck-boost circuit, and the controlled end of the third MOS transistor and the controlled end of the fourth MOS transistor are further connected with a signal end of the controller respectively.
In one embodiment, the first precharge circuit includes a first resistor and a ninth switch;
a first end of the first resistor is connected with a first end of the seventh switch circuit, a second end of the first resistor is connected with a first end of the ninth switch, and a second end of the ninth switch is connected with a second end of the seventh switch circuit;
the second pre-charge circuit comprises a second resistor and a tenth switch;
a first end of the second resistor is connected with a first end of the eighth switch circuit, a second end of the second resistor is connected with a first end of the tenth switch, and a second end of the tenth switch is connected with a second end of the eighth switch circuit;
the controlled end of the ninth switch and the controlled end of the tenth switch are further connected with the signal end of the controller respectively.
In one embodiment, the third bidirectional power conversion circuit includes an eleventh switch and a twelfth switch;
a first end of the eleventh switch forms a first power end of the third bidirectional power conversion circuit, a first end of the twelfth switch forms a second power end of the third bidirectional power conversion circuit, and a second end of the eleventh switch and a second end of the twelfth switch are respectively connected with the power ends of the high-voltage power supply modules.
A second aspect of the embodiments of the present invention provides a three-way dc power conversion apparatus, which includes the three-way dc power conversion circuit as described above.
In the embodiment of the invention, the first bidirectional power conversion circuit, the second bidirectional power conversion circuit, the third bidirectional power conversion circuit and the controller form the three paths of direct current electric energy conversion circuits, the controller outputs the switch control signals to the first bidirectional power conversion circuit, the second bidirectional power conversion circuit and the third bidirectional power conversion circuit to realize bidirectional charging and discharging of the first battery pack, the second battery pack and the high-voltage power module in pairs, and when one power module is out of power, the power module can be charged through any power module in the other two power modules, so that energy flowing and sharing between high voltage and low voltage and between low voltage and low voltage are realized.
Drawings
Fig. 1 is a schematic diagram of a first structure of a three-way dc power conversion circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of the three-way dc power conversion circuit according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of a three-way dc power conversion circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a three-way dc power conversion circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
A first aspect of the embodiments of the present invention provides a three-way dc power conversion circuit 100.
As shown in fig. 1, fig. 1 is a first structural schematic diagram of a three-way dc power conversion circuit 100 according to an embodiment of the present invention, in this embodiment, the three-way dc power conversion circuit 100 includes a first bidirectional power conversion circuit 10, a second bidirectional power conversion circuit 20, a third bidirectional power conversion circuit 30, and a controller 40;
the first bidirectional power conversion circuit 10 is respectively connected with the second bidirectional power conversion circuit 20 and the third bidirectional power conversion circuit 30 and used for connecting the first battery pack 200, the second bidirectional power conversion circuit 20 is also connected with the third bidirectional power conversion circuit 30 and used for connecting the second battery pack 300, the third bidirectional power conversion circuit 30 is also used for connecting the high-voltage power module 400, and the controller 40 is respectively electrically connected with the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20 and the third bidirectional power conversion circuit 30;
the controller 40 is configured to output a switching control signal to the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20, and the third bidirectional power conversion circuit 30, so that the first battery pack 200, the second battery pack 300, and the high-voltage power module 400 are charged and/or discharged correspondingly between each two battery packs.
In this embodiment, the high voltage power module 400 may be a charging module, a bidirectional AC/DC conversion module, a power grid, etc., the controller 40 correspondingly outputs a switch control signal to the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20, and the third bidirectional power conversion circuit 30 according to an enable signal or a touch command, the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20, and the third bidirectional power conversion circuit 30 are correspondingly turned on and perform power conversion according to the switch control signal, thereby, charge and discharge between the first battery pack 200 and the second battery pack 300, charge and discharge between the first battery pack 200 and the high voltage power module 400, and charge and discharge between the second battery pack 300 and the high voltage power module 400 are realized, and energy flow and sharing between high voltage and low voltage, and energy flow and sharing between low voltage and low voltage are realized.
For example, when the first battery pack 200 is charged between the second battery packs 300 and the voltage of the first battery pack 200 is greater than the voltage of the second battery pack 300, the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 are turned on, the third bidirectional power conversion circuit 30 is turned off, at least one of the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 performs a step-down conversion and outputs a charging voltage close to the rated charging voltage of the second battery pack 300 to the second battery pack 300, when the voltage of the first battery pack 200 is close to the voltage of the second battery pack 300, at least one of the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 performs a step-up conversion and outputs a charging voltage close to the rated charging voltage of the second battery pack 300 to the second battery pack 300, which is similarly obtained, when the second battery pack 300 is charged between the first battery packs 200, and when the voltage of the second battery pack 300 is greater than the voltage of the first battery pack 200, the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 are turned on, the third bidirectional power conversion circuit 30 is turned off, at least one of the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 performs a step-down conversion and outputs a charging voltage close to the rated charging voltage of the first battery pack 200 to the first battery pack 200, when the voltage of the first battery pack 200 is close to the voltage of the second battery pack 300, at least one of the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 performs a step-up conversion and outputs a charging voltage close to the rated charging voltage of the first battery pack 200 to the first battery pack 200, and, in order to avoid an instantaneous large current at the time of initial power-up, the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 may further be provided with a pre-charge circuit and/or a soft start circuit, the specific structure is correspondingly arranged according to the voltage requirement so as to avoid generating large current during initial electrification.
Meanwhile, when charging and discharging are performed between the first battery pack 200 and the high voltage power module 400, the first bidirectional power conversion circuit 10 and the third bidirectional power conversion circuit 30 are conducted and perform corresponding voltage conversion, and similarly, when charging and discharging are performed between the second battery pack 300 and the high voltage power module 400, the second bidirectional power conversion circuit 20 and the third bidirectional power conversion circuit 30 are conducted and perform corresponding voltage conversion, and charging and discharging between the first battery pack 200, the second battery pack 300 and the high voltage power module 400 can be performed synchronously or in a time-sharing manner, specifically, the charging and discharging requirements are set correspondingly.
Therefore, when one of the first battery pack 200, the second battery pack 300 and the high voltage power module 400 is dead, power can be supplied through any one of the other two power modules, according to the practical scenario, for example, when the first battery pack 200 is an internal power module of the electric vehicle a, the second battery pack 300 is an internal power module of the electric vehicle B, and the high voltage power module 400 is a charging pile, when the electric vehicle a is dead, the electric vehicle a can be connected to the first battery pack 200 by connecting the first bidirectional power conversion circuit 10, when the other electric vehicle B is selected to provide charging power, the second bidirectional power conversion circuit 20 is connected to the second battery pack 300, when charging is selected by the charging pile, the third bidirectional power conversion circuit 30 is connected, and the charging pile and the second battery pack 200 can both realize charging functions, thereby realizing energy flow and sharing between low voltage and low voltage, the same principle is followed between low pressure and high pressure and will not be described in detail here.
The circuit structures of the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20, and the third bidirectional power conversion circuit 30 may be set according to power supply requirements, and may include structures such as a pre-charge circuit, a soft start circuit, and a buck-boost circuit.
The three-way dc power conversion circuit 100 can be independently configured as an assembly, or directly connected to one of the power modules, and connected to other power modules during use, so as to implement bidirectional charging and discharging, and the specific configuration is not limited.
In the embodiment of the invention, the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20, the third bidirectional power conversion circuit 30 and the controller 40 are adopted to form the three-way direct-current electric energy conversion circuit 100, and the controller 40 outputs the switch control signal to the first bidirectional power conversion circuit 10, the second bidirectional power conversion circuit 20 and the third bidirectional power conversion circuit 30, so that the first battery pack 200, the second battery pack 300 and the high-voltage power module 400 are charged and discharged in two directions.
As shown in fig. 2, in one embodiment, the first bidirectional power conversion circuit 10 includes a first switch circuit 11, a second switch circuit 12, a third switch circuit 13, and a first buck-boost circuit 14;
the first terminal of the first switch circuit 11 is used for connecting the positive electrode of the first battery pack 200, the second terminal of the first switch circuit 11, the first terminal of the second switch circuit 12 and the first power terminal of the first step-up/down circuit 14 are interconnected, the second terminal of the second switch circuit 12, the second power terminal of the first step-up/down circuit 14 and the first power terminal of the third bidirectional power conversion circuit 30 are interconnected, the first terminal of the third switch circuit 13 is used for connecting the negative electrode of the first battery pack 200, the second terminal of the third switch circuit 13, the third power terminal of the first step-up/down circuit 14 and the second power terminal of the third bidirectional power conversion circuit 30 are interconnected, and the controlled terminal of the first switch circuit 11, the controlled terminal of the second switch circuit 12, the controlled terminal of the third switch circuit 13 and the controlled terminal of the first step-up/down circuit 14 are further connected with the signal terminals of the controller 40, respectively.
The second bidirectional power conversion circuit 20 includes a fourth switch circuit 21, a fifth switch circuit 22, a sixth switch circuit 23, and a second buck-boost circuit 24;
the first terminal of the fourth switch circuit 21 is used for connecting the anode of the second battery pack 300, the second terminal of the fourth switch circuit 21, the first terminal of the fifth switch circuit 22 and the first power terminal of the second buck-boost circuit 24 are interconnected, the second terminal of the fifth switch circuit 22, the second power terminal of the second buck-boost circuit 24 and the first power terminal of the third bidirectional power conversion circuit 30 are interconnected, the first terminal of the sixth switch circuit 23 is used for connecting the cathode of the second battery pack 300, the second terminal of the sixth switch circuit 23, the third power terminal of the second buck-boost circuit 24 and the second power terminal of the third bidirectional power conversion circuit 30 are interconnected, and the controlled terminal of the fourth switch circuit 21, the controlled terminal of the fifth switch circuit 22, the controlled terminal of the sixth switch circuit 23 and the controlled terminal of the second buck-boost circuit 24 are further connected with the signal terminal of the controller 40 respectively.
In this embodiment, the controller 40 correspondingly outputs the switch control signals to the first switch circuit 11, the second switch circuit 12, the third switch circuit 13, the first boost/buck circuit 14, the fourth switch circuit 21, the fifth switch circuit 22, the sixth switch circuit 23, and the second boost/buck circuit 24 according to the charging/discharging requirement and the touch instruction, so as to implement direct charging/discharging, boost/buck charging/discharging, and the like.
When direct charging and discharging are needed, the first switch circuit 11, the second switch circuit 12, the fifth switch circuit 22, the fourth switch circuit 21, the sixth switch circuit 23 and the third switch circuit 13 are turned on, and the first battery pack 200 and the second battery pack 300 are communicated through the first switch circuit 11, the second switch circuit 12, the fifth switch circuit 22, the fourth switch circuit 21, the sixth switch circuit 23 and the third switch circuit 13 to directly charge and discharge.
When the boost/buck charging/discharging is required, multiple circuits are included, for example, the first switch circuit 11, the second switch circuit 12, the second boost/buck circuit 24, the fourth switch circuit 21, the sixth switch circuit 23, and the third switch circuit 13 are controlled to be turned on, the first boost/buck circuit 14 and the fifth switch circuit 22 are turned off, the first battery pack 200 performs boost/buck conversion and charging/discharging between the second boost/buck circuit 24 and the second battery pack 300, and the second boost/buck circuit 24 can perform bidirectional boost/buck conversion according to the charging/discharging requirement.
The first switch circuit 11, the first boost-buck circuit 14, the fifth switch circuit 22, the fourth switch circuit 21, the sixth switch circuit 23 and the third switch circuit 13 can also be controlled to be turned on, the second switch circuit 12 and the second boost-buck circuit 24 are turned off, the first battery pack 200 performs boost-buck conversion and charge-discharge between the first boost-buck circuit 14 and the second battery pack 300, and the first boost-buck circuit 14 can perform bidirectional boost-buck conversion according to charge-discharge requirements.
And the first switch circuit 11, the first boost-buck circuit 14, the second boost-buck circuit 24, the fourth switch circuit 21, the sixth switch circuit 23 and the third switch circuit 13 can also be controlled to be turned on, the second switch circuit 12 and the fifth switch circuit 22 are turned off, the first battery pack 200 performs boost-buck conversion and charge-discharge between the first boost-buck circuit 14, the second boost-buck circuit 24 and the second battery pack 300, the first boost-buck circuit 14 and the second boost-buck circuit 24 can perform bidirectional boost or buck conversion according to charge-discharge requirements, such as twice boost, twice buck, once boost and once buck, once buck and once boost, and the like, and the specific communication mode and the boost-buck conversion can be selected according to requirements.
Meanwhile, when charging and discharging between the first battery pack 200 and the high voltage power module 400, charging and discharging may be performed through the first switch circuit 11, the second switch circuit 12, and the third bidirectional power conversion circuit 30, and also charging and discharging may be performed through the first switch circuit 11, the first boost/buck circuit 14, and the third bidirectional power conversion circuit 30, and similarly, when charging and discharging between the second battery pack 300 and the high voltage power module 400, charging and discharging may be performed through the fourth switch circuit 21, the fifth switch circuit 22, and the third bidirectional power conversion circuit 30, and also charging and discharging may be performed through the fourth switch circuit 21, the second boost/buck circuit 24, and the third bidirectional power conversion circuit 30.
Each switching circuit can adopt a switching device with controlled on-off capability, such as a switching tube, a relay, a circuit breaker and the like, and the specific structure is not limited.
Each BUCK-BOOST circuit can adopt structures such as a BUCK-BOOST circuit, a voltage stabilizer and the like, and the specific structure is not limited.
As shown in fig. 3, in one embodiment, the first bidirectional power conversion circuit 10 further includes a first precharge circuit 15 and a seventh switch circuit 16;
the first power supply terminal of the first precharge circuit 15, the first terminal of the seventh switch circuit 16 and the first terminal of the first switch circuit 11 are interconnected, the second power supply terminal of the first precharge circuit 15, the second terminal of the seventh switch circuit 16 and the second terminal of the second switch circuit 12 are interconnected, and the controlled terminal of the first precharge circuit 15 and the controlled terminal of the seventh switch circuit 16 are also respectively connected to the signal terminals of the controller 40.
The second bidirectional power conversion circuit 20 further includes a second precharge circuit 25 and an eighth switch circuit 26;
the first power supply terminal of the second precharge circuit 25, the first terminal of the eighth switch circuit 26 and the first terminal of the fifth switch circuit 22 are interconnected, the second power supply terminal of the second precharge circuit 25, the second terminal of the eighth switch circuit 26 and the second terminal of the sixth switch circuit 23 are interconnected, and the controlled terminal of the second precharge circuit 25 and the controlled terminal of the eighth switch circuit 26 are also respectively connected to the signal terminals of the controller 40.
In this embodiment, when the first battery pack 200 discharges the second battery pack 300 or the high-voltage power supply module 400, in order to avoid generating a large current at the moment of power-on, the controller 40 firstly controls the first pre-charge circuit 15 and the third switch circuit 13 to be turned on, the first pre-charge circuit 15 plays a role of current limiting, the first pre-charge circuit 15 is controlled to be turned off after pre-charge is completed, and the switch circuits in the seventh switch circuit 16, the first switch circuit 11 and the second switch circuit 12 are controlled to be turned on correspondingly, so that direct charge and discharge or buck-boost conversion charge and discharge are realized.
Similarly, when the second battery pack 300 discharges the first battery pack 200 or the high-voltage power supply module 400, in order to avoid generating a large current at the moment of energization, the controller 40 firstly controls the second pre-charge circuit 25 and the sixth switch circuit 23 to be turned on, the second pre-charge circuit 25 plays a role in limiting current, the second pre-charge circuit 25 is controlled to be turned off after pre-charging is completed, and the switch circuits in the eighth switch circuit 26, the fourth switch circuit 21 and the fifth switch circuit 22 are controlled to be correspondingly turned on, so that direct charging and discharging or buck-boost conversion charging and discharging are realized.
The first pre-charge circuit 15 and the second pre-charge circuit 25 may include a current-limiting resistor and a corresponding switch component, and the specific structure is not limited.
As shown in fig. 4, in one embodiment, the first boost circuit 14 includes a first inductor L1, a first capacitor C1, a first MOS transistor Q1, and a second MOS transistor Q2;
a first end of the first inductor L1 and a first end of the first capacitor C1 are commonly connected to form a first power supply terminal of the first boost-down circuit 14, a second end of the first inductor L1, an output terminal of the first MOS transistor Q1 and an input terminal of the second MOS transistor Q2 are interconnected, an input terminal of the first MOS transistor Q1 forms a second power supply terminal of the first boost-down circuit 14, a second end of the first capacitor C1 and an output terminal of the second MOS transistor Q2 are commonly connected to form a third power supply terminal of the first boost-down circuit 14, and a controlled terminal of the first MOS transistor Q1 and a controlled terminal of the second MOS transistor Q2 are further respectively connected to a signal terminal of the controller 40.
The second buck-boost circuit 24 includes a second inductor L2, a second capacitor C2, a third MOS transistor Q3, and a fourth MOS transistor Q4;
a first terminal of the second inductor L2 and a first terminal of the second capacitor C2 are commonly connected to form a first power supply terminal of the second boost-down circuit 24, a second terminal of the second inductor L2, an output terminal of the third MOS transistor Q3 and an input terminal of the fourth MOS transistor Q4 are interconnected, an input terminal of the third MOS transistor Q3 forms a second power supply terminal of the second boost-down circuit 24, a second terminal of the second capacitor C2 and an output terminal of the fourth MOS transistor Q4 are commonly connected to form a third power supply terminal of the second boost-down circuit 24, and a controlled terminal of the third MOS transistor Q3 and a controlled terminal of the fourth MOS transistor Q4 are further respectively connected to a signal terminal of the controller 40.
The first precharge circuit 15 includes a first resistor R1 and a ninth switch K9;
a first end of the first resistor R1 is connected to a first end of the seventh switch circuit 16, a second end of the first resistor R1 is connected to a first end of the ninth switch K9, and a second end of the ninth switch K9 is connected to a second end of the seventh switch circuit 16;
the second precharge circuit 25 includes a second resistor R2 and a tenth switch K10;
a first end of the second resistor R2 is connected to a first end of the eighth switch circuit 26, a second end of the second resistor R2 is connected to a first end of the tenth switch K10, and a second end of the tenth switch K10 is connected to a second end of the eighth switch circuit 26;
the controlled terminal of the ninth switch K9 and the controlled terminal of the tenth switch K10 are also connected to the signal terminal of the controller 40, respectively.
The first to eighth switch circuits 11 to 26 are respectively the first to eighth switches K1 to K8.
In this embodiment, the first capacitor C1, the first inductor L1, the first MOS transistor Q1, and the second MOS transistor Q2 form the first buck-boost circuit 14, and the second capacitor C2, the second inductor L2, the third MOS transistor Q3, and the fourth MOS transistor form the second buck-boost circuit 24, which has the following working processes:
taking the first battery pack 200 to charge the second battery pack 300 as an example:
if the voltage of the first battery pack 200 is greater than that of the second battery pack 300, the seventh switch K7 is directly closed after the precharge of the third bidirectional power conversion circuit 30 and the first capacitor C1 is completed by the first resistor R1, the ninth switch K9 and the second switch K2, the third MOS transistor Q3, the parasitic diode D4 of the fourth MOS transistor Q4, the second inductor L2 and the second capacitor C2 form a BUCK circuit, the voltage is softly started to the voltage of the second battery pack 300, then the fourth switch K4 and the sixth switch K6 are closed, and the constant-current charging of the second battery pack 300 is realized by controlling the duty ratio of the third MOS transistor Q3.
During charging, when the voltage of the first battery pack 200 drops to be close to the voltage of the second battery pack 300, the seventh switch K7 is opened, the first switch K1 is closed, the second switch K2 is opened, the second MOS transistor Q2, the parasitic diode D1 of the first MOS transistor Q1, the first inductor L1 and the first capacitor C1 form a BOOST circuit, and the output voltage of the BOOST circuit is controlled to be constant at a fixed value, so that the second battery pack 300 is continuously charged.
If the first battery pack 200 is lower than the second battery pack 300 or has a small difference, the ninth switch K9 and the second switch K2 are first closed, the bus capacitors C3 and C4 and the first capacitor C1 are precharged through the first resistor R1, after the precharging is completed, the ninth switch K9 and the second switch K2 are opened, the second MOS transistor Q2, the parasitic diode D1 of the first MOS transistor Q1, the first inductor L1 and the first capacitor C1 form a BOOST circuit, the output voltage of the BOOST circuit is kept constant at a fixed value, and then the second battery pack 300 is charged through a BUCK circuit formed by the third MOS transistor Q3, the parasitic diode D4 of the fourth MOS transistor Q4, the second inductor L2 and the second capacitor C2.
The charging principle of the first battery pack 200 by the second battery pack 300 is the same, and is not described in detail herein.
By arranging the switches, the first buck-boost circuit 14 and the second buck-boost circuit 24, the compatible battery range is wide, and the energy flow efficiency is high.
With continued reference to fig. 4, in one embodiment, the third bidirectional power conversion circuit 30 includes an eleventh switch K11 and a twelfth switch K12;
a first terminal of the eleventh switch K11 forms a first power terminal of the third bidirectional power conversion circuit 30, a first terminal of the twelfth switch K12 forms a second power terminal of the third bidirectional power conversion circuit 30, and a second terminal of the eleventh switch K11 and a second terminal of the twelfth switch K12 are respectively connected to the power terminals of the high-voltage power module 400.
In this embodiment, the high voltage power module 400 is connected to the first bidirectional power conversion circuit 10 and the second bidirectional power conversion circuit 20 through the eleventh switch K11 and the twelfth switch K12, so as to realize charging and discharging between the first battery pack 200 and/or the second battery pack 300 and the high voltage power module 400, when the high voltage power module 400 is a charging module, the first battery pack 200 and the second battery pack 300 can be charged, when the high voltage power module 400 is a bidirectional AC/DC conversion module, the AC/DC conversion module is connected to a power grid, and the first battery pack 200 and/or the second battery pack 300 can be charged or fed by the power grid through the AC/DC conversion module.
Meanwhile, in order to avoid the generation of an initial large current during the charging and discharging between the high voltage power module 400 and the battery pack, the eleventh switch K11 is provided with a third pre-charging circuit in parallel, the third pre-charging circuit comprises a third resistor R3 and a thirteenth switch K13, and the third resistor R3 plays a role in limiting the current.
The present invention further provides a three-way dc power conversion apparatus, which includes a three-way dc power conversion circuit, and the specific structure of the three-way dc power conversion circuit refers to the above embodiments, and since the three-way dc power conversion apparatus adopts all the technical solutions of all the above embodiments, the three-way dc power conversion apparatus at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details thereof are not repeated herein.
In this embodiment, the three-way dc power conversion device may be correspondingly connected to the first battery pack 200, the second battery pack 300, and the high-voltage power module 400 to perform bidirectional charging and discharging of three-way power supplies, so as to realize the flowing and sharing of energy between high voltage and low voltage, and the flowing and sharing of energy between low voltage and low voltage.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A three-way direct current electric energy conversion circuit is characterized by comprising a first bidirectional power supply conversion circuit, a second bidirectional power supply conversion circuit, a third bidirectional power supply conversion circuit and a controller;
the first bidirectional power conversion circuit is respectively connected with the second bidirectional power conversion circuit and the third bidirectional power conversion circuit and used for connecting a first battery pack, the second bidirectional power conversion circuit is also connected with the third bidirectional power conversion circuit and used for connecting a second battery pack, the third bidirectional power conversion circuit is also used for connecting a high-voltage power supply module, and the controller is respectively electrically connected with the first bidirectional power conversion circuit, the second bidirectional power conversion circuit and the third bidirectional power conversion circuit;
the controller is configured to output a switch control signal to the first bidirectional power conversion circuit, the second bidirectional power conversion circuit, and the third bidirectional power conversion circuit, so that the first battery pack, the second battery pack, and the high-voltage power module are charged and/or discharged correspondingly between each two of the first battery pack, the second battery pack, and the high-voltage power module.
2. A three-way dc power conversion circuit according to claim 1, wherein the first bi-directional power conversion circuit comprises a first switching circuit, a second switching circuit, a third switching circuit, and a first boost circuit;
a first terminal of the first switching circuit is for connecting the positive electrode of the first battery pack, a second terminal of the first switching circuit, a first terminal of the second switching circuit, and a first power supply terminal of the first buck-boost circuit are interconnected, a second terminal of the second switching circuit, a second power supply terminal of the first buck-boost circuit and a first power supply terminal of the third bidirectional power conversion circuit are interconnected, a first terminal of the third switching circuit is for connection to a negative electrode of the first battery pack, a second terminal of the third switching circuit, a third power supply terminal of the first buck-boost circuit, and a second power supply terminal of the third bidirectional power conversion circuit are interconnected, the controlled end of the first switch circuit, the controlled end of the second switch circuit, the controlled end of the third switch circuit and the controlled end of the first buck-boost circuit are also respectively connected with the signal end of the controller.
3. A three-way dc power conversion circuit according to claim 2, wherein said second bi-directional power conversion circuit comprises a fourth switching circuit, a fifth switching circuit, a sixth switching circuit, and a second buck-boost circuit;
a first terminal of the fourth switching circuit is used for connecting the anode of the second battery pack, a second terminal of the fourth switching circuit, a first terminal of the fifth switching circuit and a first power supply terminal of the second buck-boost circuit are interconnected, a second terminal of the fifth switching circuit, a second power supply terminal of the second buck-boost circuit, and a first power supply terminal of the third bidirectional power conversion circuit are interconnected, a first terminal of the sixth switching circuit is used for connecting a negative electrode of the second battery pack, a second terminal of the sixth switching circuit, a third power supply terminal of the second buck-boost circuit and a second power supply terminal of the third bidirectional power conversion circuit are interconnected, the controlled end of the fourth switch circuit, the controlled end of the fifth switch circuit, the controlled end of the sixth switch circuit and the controlled end of the second buck-boost circuit are also respectively connected with the signal end of the controller.
4. A three-way dc power conversion circuit according to claim 3, wherein said first bi-directional power conversion circuit further comprises a first pre-charge circuit and a seventh switch circuit;
the first power end of the first pre-charge circuit, the first end of the seventh switch circuit and the first end of the first switch circuit are interconnected, the second power end of the first pre-charge circuit, the second end of the seventh switch circuit and the second end of the second switch circuit are interconnected, and the controlled end of the first pre-charge circuit and the controlled end of the seventh switch circuit are further respectively connected with the signal end of the controller.
5. A three-way DC power conversion circuit according to claim 4 wherein said second bidirectional power conversion circuit further comprises a second precharge circuit and an eighth switching circuit;
the first power end of the second pre-charge circuit, the first end of the eighth switch circuit and the first end of the fifth switch circuit are interconnected, the second power end of the second pre-charge circuit, the second end of the eighth switch circuit and the second end of the sixth switch circuit are interconnected, and the controlled end of the second pre-charge circuit and the controlled end of the eighth switch circuit are further respectively connected with the signal end of the controller.
6. A three-way DC power conversion circuit according to claim 5, wherein said first buck-boost circuit comprises a first inductor, a first capacitor, a first MOS transistor and a second MOS transistor;
the first end of the first inductor and the first end of the first capacitor are connected in common to form a first power supply end of the first boost-buck circuit, the second end of the first inductor, the output end of the first MOS transistor and the input end of the second MOS transistor are interconnected, the input end of the first MOS transistor forms a second power supply end of the first boost-buck circuit, the second end of the first capacitor and the output end of the second MOS transistor are connected in common to form a third power supply end of the first boost-buck circuit, and the controlled end of the first MOS transistor and the controlled end of the second MOS transistor are further connected with a signal end of the controller respectively.
7. A three-way DC power conversion circuit according to claim 6, wherein said second buck-boost circuit comprises a second inductor, a second capacitor, a third MOS transistor and a fourth MOS transistor;
the first end of the second inductor and the first end of the second capacitor are connected in common to form a first power supply end of the second buck-boost circuit, the second end of the second inductor, the output end of the third MOS transistor and the input end of the fourth MOS transistor are interconnected, the input end of the third MOS transistor forms a second power supply end of the second buck-boost circuit, the second end of the second capacitor and the output end of the fourth MOS transistor are connected in common to form a third power supply end of the second buck-boost circuit, and the controlled end of the third MOS transistor and the controlled end of the fourth MOS transistor are further connected with a signal end of the controller respectively.
8. A three-way dc power conversion circuit according to claim 7, wherein said first pre-charge circuit comprises a first resistor and a ninth switch;
a first end of the first resistor is connected with a first end of the seventh switch circuit, a second end of the first resistor is connected with a first end of the ninth switch, and a second end of the ninth switch is connected with a second end of the seventh switch circuit;
the second pre-charge circuit comprises a second resistor and a tenth switch;
a first end of the second resistor is connected with a first end of the eighth switch circuit, a second end of the second resistor is connected with a first end of the tenth switch, and a second end of the tenth switch is connected with a second end of the eighth switch circuit;
the controlled end of the ninth switch and the controlled end of the tenth switch are further connected with the signal end of the controller respectively.
9. A three-way dc power conversion circuit according to claim 8, wherein the third bi-directional power conversion circuit includes an eleventh switch and a twelfth switch;
a first end of the eleventh switch forms a first power end of the third bidirectional power conversion circuit, a first end of the twelfth switch forms a second power end of the third bidirectional power conversion circuit, and a second end of the eleventh switch and a second end of the twelfth switch are respectively connected with the power ends of the high-voltage power supply modules.
10. A three-way dc power conversion apparatus comprising the three-way dc power conversion circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011013941.0A CN114301288A (en) | 2020-09-24 | 2020-09-24 | Three-way direct-current electric energy conversion circuit and three-way direct-current electric energy conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011013941.0A CN114301288A (en) | 2020-09-24 | 2020-09-24 | Three-way direct-current electric energy conversion circuit and three-way direct-current electric energy conversion device |
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| CN114301288A true CN114301288A (en) | 2022-04-08 |
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| CN202011013941.0A Pending CN114301288A (en) | 2020-09-24 | 2020-09-24 | Three-way direct-current electric energy conversion circuit and three-way direct-current electric energy conversion device |
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| CN (1) | CN114301288A (en) |
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- 2020-09-24 CN CN202011013941.0A patent/CN114301288A/en active Pending
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