Boosting and bucking device and system

Abstract

The application discloses a voltage boosting and reducing device and system, which comprises a voltage boosting and reducing circuit configured to output a first output voltage under a first control of a transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of an external power battery; the first output voltage is used for supplying power to a vehicle motor inverter; the transistor controller is configured to output the first control to the voltage boosting and reducing circuit when the vehicle is in a driving mode; the first control refers to on and off control of controllable devices of the voltage boosting and reducing circuit itself.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more particularly to a step-up / step-down device and system. Background Technology

[0002] In power electronic devices, there are some components that achieve specific functions by boosting or reducing the input voltage. These components are commonly referred to as boost converters or buck converters. In new energy vehicles, these components manifest as BOOST (boost voltage) and BUCK (buck voltage). However, currently, only boost discharge or buck discharge functions can be implemented within the same device. Summary of the Invention

[0003] This application provides a voltage boosting and bucking device and system that can realize both voltage boosting and voltage bucking discharge functions in the same device.

[0004] This application provides a boost / buck converter for use in new energy vehicles, the boost / buck converter including a boost / buck circuit and a transistor controller;

[0005] The boost / buck circuit is configured to output a first output voltage under the first control of the transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of an external power battery; the first output voltage is used to power the vehicle motor inverter.

[0006] The transistor controller is configured to output a first control to the boost / buck circuit when the vehicle is in driving mode; the first control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

[0007] In one exemplary embodiment, the boost / buck circuit is further configured to output a second output voltage under the second control of the transistor controller, the second output voltage being greater than the second input voltage; the second input voltage is the voltage of the external charging pile; the second output voltage is used to charge the external power battery.

[0008] The transistor controller is further configured to output a second control to the boost / buck circuit when the vehicle is in charging mode; the second control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

[0009] In one exemplary embodiment, the boost / buck circuit includes a first capacitor, an inductor, a diode, a first transistor, a second transistor, a third transistor, and a second capacitor.

[0010] The first terminal of the first capacitor serves as the first negative terminal of the boost / buck device; the second terminal of the first capacitor serves as the first positive terminal of the boost / buck device; the first terminal of the second capacitor serves as the second positive terminal of the boost / buck device; and the second terminal of the second capacitor serves as the second negative terminal of the boost / buck device.

[0011] The first terminal of the first capacitor is connected to the anode of the diode and the first terminal of the second transistor, respectively; the second terminal of the second transistor is connected to the first terminal of the inductor and the first terminal of the second capacitor, respectively; the second terminal of the first capacitor is connected to the first terminal of the third transistor, respectively; the second terminal of the third transistor is connected to the first terminal of the first transistor and the second terminal of the inductor, respectively; the second terminal of the first transistor is connected to the cathode of the diode and the second terminal of the second capacitor, respectively.

[0012] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in driving mode, i.e., after the first positive terminal and the first negative terminal of the boost / buck converter are connected to the positive and negative terminals of the power battery respectively, control the first transistor to turn off, the second transistor to turn on, and the third transistor to turn on, and control a first conduction coefficient; such that when the first conduction coefficient is less than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is less than the voltage of the power battery; and when the first conduction coefficient is greater than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is greater than the voltage of the power battery.

[0013] The first conduction coefficient refers to the ratio of the conduction time of the second transistor and the third transistor to the sum of the conduction time of the second transistor and the third transistor and the turn-off time of the second transistor and the third transistor.

[0014] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in charging mode, i.e., when the second positive terminal and the second negative terminal of the boost / buck converter are connected to the positive and negative terminals of the charging pile respectively, control the second transistor to turn off, and the first transistor and the third transistor to turn on alternately, and control the second conduction coefficient; such that when the second conduction coefficient is greater than zero, the voltage between the first positive terminal and the first negative terminal of the boost / buck converter is greater than the voltage of the charging pile;

[0015] The second conduction coefficient is the ratio of the conduction time of the first transistor to the sum of the conduction time of the first transistor and the turn-off time of the first transistor.

[0016] This application provides a boost / buck system for use in new energy vehicles, including:

[0017] The system includes a boost / buck converter, a switching switch, an inverter, a charging pile, a power battery, and a switching switch controller; the boost / buck converter includes a boost / buck circuit and a transistor controller.

[0018] The boost / buck circuit is configured to output a first output voltage under the first control of the transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of the power battery; the first output voltage is used to power the inverter of the vehicle motor.

[0019] The transistor controller is configured to output a first control to the boost / buck circuit when the vehicle is in driving mode; the first control refers to controlling the turn-on and turn-off of the controllable devices of the boost / buck circuit itself.

[0020] The switching controller is configured to switch the switching switch to the inverter side when the vehicle is in driving mode, so that the boost / buck device is connected to the inverter; and to switch the switching switch to the charging pile side when the vehicle is in charging mode, so that the boost / buck device is connected to the charging pile.

[0021] In one exemplary embodiment, the boost / buck circuit is further configured to output a second output voltage under the second control of the transistor controller, the second output voltage being greater than the second input voltage; the second input voltage is the voltage of the charging pile; the second output voltage is used to charge the power battery;

[0022] The transistor controller is further configured to output a second control to the boost / buck circuit when the vehicle is in charging mode; the second control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

[0023] In one exemplary embodiment, the boost / buck circuit includes a first capacitor, an inductor, a diode, a first transistor, a second transistor, a third transistor, and a second capacitor.

[0024] The first terminal of the first capacitor serves as the first negative terminal of the boost / buck device; the second terminal of the first capacitor serves as the first positive terminal of the boost / buck device; the first terminal of the second capacitor serves as the second positive terminal of the boost / buck device; and the second terminal of the second capacitor serves as the second negative terminal of the boost / buck device.

[0025] The first terminal of the first capacitor is connected to the anode of the diode and the first terminal of the second transistor, respectively; the second terminal of the second transistor is connected to the first terminal of the inductor and the first terminal of the second capacitor, respectively; the second terminal of the first capacitor is connected to the first terminal of the third transistor, respectively; the second terminal of the third transistor is connected to the first terminal of the first transistor and the second terminal of the inductor, respectively; the second terminal of the first transistor is connected to the cathode of the diode and the second terminal of the second capacitor, respectively.

[0026] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in driving mode, i.e., after the first positive terminal and the first negative terminal of the boost / buck converter are connected to the positive and negative terminals of the power battery respectively, control the first transistor to turn off, the second transistor to turn on, and the third transistor to turn on, and control a first conduction coefficient; such that when the first conduction coefficient is less than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is less than the voltage of the power battery; and when the first conduction coefficient is greater than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is greater than the voltage of the power battery.

[0027] The first conduction coefficient refers to the ratio of the conduction time of the second transistor and the third transistor to the sum of the conduction time of the second transistor and the third transistor and the turn-off time of the second transistor and the third transistor.

[0028] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in charging mode, i.e., when the second positive terminal and the second negative terminal of the boost / buck converter are connected to the positive and negative terminals of the charging pile respectively, control the second transistor to turn off, and the first transistor and the third transistor to turn on alternately, and control the second conduction coefficient; such that when the second conduction coefficient is greater than zero, the voltage between the first positive terminal and the first negative terminal of the boost / buck converter is greater than the voltage of the charging pile;

[0029] The second conduction coefficient is the ratio of the conduction time of the first transistor to the sum of the conduction time of the first transistor and the turn-off time of the first transistor.

[0030] In one exemplary embodiment, the switching switch includes two switching switches: a first switching switch and a second switching switch; each switching switch includes a stationary terminal, a first moving terminal, and a second moving terminal;

[0031] The stationary terminal of the first switching switch is connected to the second positive terminal of the boost / buck converter; the first moving terminal of the first switching switch is connected to the positive terminal of the charging pile; and the second moving terminal of the first switching switch is connected to the positive input terminal of the inverter.

[0032] The stationary terminal of the second switching switch is connected to the second negative terminal of the boost / buck device; the first moving terminal of the second switching switch is connected to the negative terminal of the charging pile; and the second moving terminal of the second switching switch is connected to the negative input terminal of the inverter.

[0033] In one exemplary embodiment, the switching controller is configured to connect the stationary terminal of the first switching switch to the second moving terminal of the first switching switch and the stationary terminal of the second switching switch to the second moving terminal of the second switching switch when the vehicle is in driving mode; and to connect the stationary terminal of the first switching switch to the first moving terminal of the first switching switch and the stationary terminal of the second switching switch to the first moving terminal of the second switching switch when the vehicle is in charging mode.

[0034] This application has the following advantages:

[0035] At least one embodiment of this application can realize both boost discharge function and buck discharge function in the same device.

[0036] In one implementation of this application, an external lower-voltage charger can be used to charge a higher-voltage battery pack.

[0037] Of course, any product implementing this application does not necessarily need to achieve all of the advantages described above at the same time.

[0038] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the solutions described in the description and the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0040] Figure 1 This is a schematic diagram of the boost / buck device according to an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of a boost / buck system according to an embodiment of this application;

[0042] Figure 3This is a schematic diagram of another boost / buck system according to an embodiment of this application;

[0043] Figure 4 for Figure 3 The diagram shows the structure of the booster / puller device in the system shown.

[0044] Figure 5 for Figure 3 The conduction in the system shown Turn off Circuit diagram;

[0045] Figure 6 for Figure 3 Shutdown in the system shown Conductivity Circuit diagram;

[0046] Figure 7 for Figure 3 Shutdown in the system shown Conductivity Circuit diagram;

[0047] Figure 8 for Figure 3 Shutdown in the system shown Conductivity The circuit diagram. Detailed Implementation

[0048] Figure 1 This is a schematic diagram of the boost / buck device according to an embodiment of this application, as shown below. Figure 1 As shown, the boost / buck converter of this embodiment is applied to new energy vehicles. The boost / buck converter includes a boost / buck circuit and a transistor controller;

[0049] The boost / buck circuit is configured to output a first output voltage under the first control of the transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of an external power battery; the first output voltage is used to power the vehicle motor inverter.

[0050] The transistor controller is configured to output a first control to the boost / buck circuit when the vehicle is in driving mode; the first control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

[0051] In one exemplary embodiment, the boost / buck circuit is further configured to output a second output voltage under the second control of the transistor controller, the second output voltage being greater than the second input voltage; the second input voltage is the voltage of the external charging pile; the second output voltage is used to charge the external power battery.

[0052] The transistor controller is further configured to output a second control to the boost / buck circuit when the vehicle is in charging mode; the second control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

[0053] In one exemplary embodiment, the boost / buck circuit includes a first capacitor, an inductor, a diode, a first transistor, a second transistor, a third transistor, and a second capacitor.

[0054] The first terminal of the first capacitor serves as the first negative terminal of the boost / buck device; the second terminal of the first capacitor serves as the first positive terminal of the boost / buck device; the first terminal of the second capacitor serves as the second positive terminal of the boost / buck device; and the second terminal of the second capacitor serves as the second negative terminal of the boost / buck device.

[0055] The first terminal of the first capacitor is connected to the anode of the diode and the first terminal of the second transistor, respectively; the second terminal of the second transistor is connected to the first terminal of the inductor and the first terminal of the second capacitor, respectively; the second terminal of the first capacitor is connected to the first terminal of the third transistor, respectively; the second terminal of the third transistor is connected to the first terminal of the first transistor and the second terminal of the inductor, respectively; the second terminal of the first transistor is connected to the cathode of the diode and the second terminal of the second capacitor, respectively.

[0056] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in driving mode, i.e., after the first positive terminal and the first negative terminal of the boost / buck converter are connected to the positive and negative terminals of the power battery respectively, control the first transistor to turn off, the second transistor to turn on, and the third transistor to turn on, and control a first conduction coefficient; such that when the first conduction coefficient is less than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is less than the voltage of the power battery; and when the first conduction coefficient is greater than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is greater than the voltage of the power battery.

[0057] The first conduction coefficient refers to the ratio of the conduction time of the second transistor and the third transistor to the sum of the conduction time of the second transistor and the third transistor and the turn-off time of the second transistor and the third transistor.

[0058] In one exemplary embodiment, the first transistor, the second transistor, and the third transistor can be silicon carbide thyristors. In this case, the first terminal of the transistor can be the anode of the silicon carbide thyristor, the second terminal can be the cathode of the silicon carbide thyristor, and the gate of the silicon carbide thyristor serves as the control electrode.

[0059] In one exemplary embodiment, the first transistor, the second transistor, and the third transistor can be silicon carbide transistors. In this case, the first terminal of the transistor can be the source / drain of the silicon carbide transistor, the second terminal can be the drain / source of the silicon carbide transistor, and the gate of the silicon carbide transistor serves as the control electrode.

[0060] For example, the first conduction coefficient is ,in, The on-time of the third transistor and the second transistor. The time during which the third transistor and the second transistor are turned off. The third transistor and the second transistor are simultaneously turned on and off. The voltage between the second positive terminal and the second negative terminal of the boost / buck converter. The voltage between the first positive terminal and the first negative terminal of the boost / buck device The relationship is as follows: .

[0061] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in charging mode, i.e., when the second positive terminal and the second negative terminal of the boost / buck converter are connected to the positive and negative terminals of the charging pile respectively, control the second transistor to turn off, and the first transistor and the third transistor to turn on alternately, and control the second conduction coefficient; such that when the second conduction coefficient is greater than zero, the voltage between the first positive terminal and the first negative terminal of the boost / buck converter is greater than the voltage of the charging pile;

[0062] The second conduction coefficient is the ratio of the conduction time of the first transistor to the sum of the conduction time of the first transistor and the turn-off time of the first transistor.

[0063] For example, the second conduction coefficient is , in, It is the time when the first transistor is turned on. This refers to the time when the first transistor is turned off. The voltage between the second positive and second negative terminals of the boost / buck converter. The voltage between the first positive terminal and the first negative terminal of the boost / buck device The relationship is as follows: .

[0064] The boost and buck device of this application embodiment can realize both boost discharge function and buck discharge function in the same device.

[0065] Figure 2 This is a schematic diagram of the boost / buck system according to an embodiment of this application, as shown below. Figure 2As shown, the boost / buck system includes a boost / buck device, a switching switch, an inverter, a charging pile, a power battery, and a switching switch controller; the boost / buck device includes a boost / buck circuit and the transistor controller.

[0066] The boost / buck circuit is configured to output a first output voltage under the first control of the transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of the power battery; the first output voltage is used to power the inverter of the vehicle motor.

[0067] The transistor controller is configured to output a first control to the boost / buck circuit when the vehicle is in driving mode; the first control refers to controlling the turn-on and turn-off of the controllable devices of the boost / buck circuit itself.

[0068] The switching controller is configured to switch the switching switch to the inverter side when the vehicle is in driving mode, so that the boost / buck device is connected to the inverter; and to switch the switching switch to the charging pile side when the vehicle is in charging mode, so that the boost / buck device is connected to the charging pile.

[0069] In one exemplary embodiment, the boost / buck circuit is further configured to output a second output voltage under the second control of the transistor controller, the second output voltage being greater than the second input voltage; the second input voltage is the voltage of the charging pile; the second output voltage is used to charge the power battery;

[0070] The transistor controller is further configured to output a second control to the boost / buck circuit when the vehicle is in charging mode; the second control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

[0071] In one exemplary embodiment, the boost / buck circuit includes a first capacitor, an inductor, a diode, a first transistor, a second transistor, a third transistor, and a second capacitor.

[0072] The first terminal of the first capacitor serves as the first negative terminal of the boost / buck device; the second terminal of the first capacitor serves as the first positive terminal of the boost / buck device; the first terminal of the second capacitor serves as the second positive terminal of the boost / buck device; and the second terminal of the second capacitor serves as the second negative terminal of the boost / buck device.

[0073] The first terminal of the first capacitor is connected to the anode of the diode and the first terminal of the second transistor, respectively; the second terminal of the second transistor is connected to the first terminal of the inductor and the first terminal of the second capacitor, respectively; the second terminal of the first capacitor is connected to the first terminal of the third transistor, respectively; the second terminal of the third transistor is connected to the first terminal of the first transistor and the second terminal of the inductor, respectively; the second terminal of the first transistor is connected to the cathode of the diode and the second terminal of the second capacitor, respectively.

[0074] In one exemplary embodiment, the first transistor, the second transistor, and the third transistor can be silicon carbide thyristors. In this case, the first terminal of the transistor can be the anode of the silicon carbide thyristor, the second terminal can be the cathode of the silicon carbide thyristor, and the gate of the silicon carbide thyristor serves as the control electrode.

[0075] In one exemplary embodiment, the first transistor, the second transistor, and the third transistor can be silicon carbide transistors. In this case, the first terminal of the transistor can be the source / drain of the silicon carbide transistor, the second terminal can be the drain / source of the silicon carbide transistor, and the gate of the silicon carbide transistor serves as the control electrode.

[0076] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in driving mode, i.e., after the first positive terminal and the first negative terminal of the boost / buck converter are connected to the positive and negative terminals of the power battery respectively, control the first transistor to turn off, the second transistor to turn on, and the third transistor to turn on, and control a first conduction coefficient; such that when the first conduction coefficient is less than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is less than the voltage of the power battery; and when the first conduction coefficient is greater than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is greater than the voltage of the power battery.

[0077] The first conduction coefficient refers to the ratio of the conduction time of the second transistor and the third transistor to the sum of the conduction time of the second transistor and the third transistor and the turn-off time of the second transistor and the third transistor.

[0078] In one exemplary embodiment, the transistor controller is specifically configured to, when the vehicle is in charging mode, i.e., when the second positive terminal and the second negative terminal of the boost / buck converter are connected to the positive and negative terminals of the charging pile respectively, control the second transistor to turn off, and the first transistor and the third transistor to turn on alternately, and control the second conduction coefficient; such that when the second conduction coefficient is greater than zero, the voltage between the first positive terminal and the first negative terminal of the boost / buck converter is greater than the voltage of the charging pile;

[0079] The second conduction coefficient is the ratio of the conduction time of the first transistor to the sum of the conduction time of the first transistor and the turn-off time of the first transistor.

[0080] In one exemplary embodiment, the switching switch includes two switching switches: a first switching switch and a second switching switch; each switching switch includes a stationary terminal, a first moving terminal, and a second moving terminal;

[0081] The stationary terminal of the first switching switch is connected to the second positive terminal of the boost / buck converter; the first moving terminal of the first switching switch is connected to the positive terminal of the charging pile; and the second moving terminal of the first switching switch is connected to the positive input terminal of the inverter.

[0082] The stationary terminal of the second switching switch is connected to the second negative terminal of the boost / buck device; the first moving terminal of the second switching switch is connected to the negative terminal of the charging pile; and the second moving terminal of the second switching switch is connected to the negative input terminal of the inverter.

[0083] In one exemplary embodiment, the switching controller is configured to connect the stationary terminal of the first switching switch to the second moving terminal of the first switching switch and the stationary terminal of the second switching switch to the second moving terminal of the second switching switch when the vehicle is in driving mode; and to connect the stationary terminal of the first switching switch to the first moving terminal of the first switching switch and the stationary terminal of the second switching switch to the first moving terminal of the second switching switch when the vehicle is in charging mode.

[0084] Figure 3 This is a schematic diagram of another boost / buck system according to an embodiment of this application; as shown Figure 3 As shown, This refers to the input voltage in drive mode (i.e., the output voltage of the power battery). For output voltage, It is a diode. It is a silicon carbide (SiC) thyristor (SiC can conduct in both directions). L For inductance, For automotive film capacitors, For the two IGBT groups on the half-bridge corresponding to phase A of the three-phase motor, similarly, Corresponding to phase B, Corresponding to phase C; the stator windings of the three-phase motor M are in a star connection, where... N Point 1 is the neutral point of the three-phase winding; SW1 and SW2 are switching switches. When SW1 is on, the vehicle is in charging mode and connected to a charging pile to charge the power battery; when SW2 is off, the vehicle is in driving mode and connected to the motor inverter to supply voltage to the motor.

[0085] Figure 4 The boost / buck circuit shown includes capacitor C1, capacitor C2, thyristors S1, S2, and S3, diode D1, and inductor L. The voltage across capacitor C2 is... .

[0086] In driver mode, the BOOST / BUCK function is described as follows:

[0087] At this time, the power battery Output voltage after step-up and step-down , The control method is as follows:

[0088] When conduction , turn off Energy storage in inductor L is as follows: Figure 5 As shown in the figure, the direction of current I is marked:

[0089] When turned off Conductive Inductor L releases energy, and the circuit is as follows: Figure 6 As shown:

[0090] The control method is described as follows:

[0091] Three silicon carbide thyristors The switching frequencies are the same, that is, the switching cycles are... They are the same (d represents Driving), let The control duty cycle is , The duty cycle is (1- That is to say, when and When conducting, Just shut it off; when and When shut down, They are complementary in that they conduct electricity.

[0092] Voltage and The calculation relationships are as follows:

[0093] when Conductive, When turned off, inductor L stores data from... The energy of L, and the current flowing through L are:

[0094] ;

[0095] when Turn off, When the circuit is turned on, the inductor L releases the stored energy, and the current flowing through L is:

[0096] ;

[0097] According to the principle of continuity of electric current,

[0098]

[0099] but,

[0100] ;

[0101]

[0102] make in for Conduction time, for The shutdown time is...

[0103] ;

[0104] (1);

[0105] Thus, when hour, This enables the Buck buck function;

[0106] when hour, This enables the Boost function.

[0107] In charging or energy recovery mode, the Boost function is described as follows:

[0108] In this mode, As an energy input terminal for the battery pack Charge, Normally off, The control method is as follows:

[0109] When turned off Conductive Energy is stored in inductor L, as shown in the schematic diagram. Figure 7 As shown:

[0110] When turned off Conductive ,Give Charging, as shown in the diagram. Figure 8 As shown:

[0111] Control method description:

[0112] Among the three silicon carbide thyristors In this mode, it is always off. The switching frequencies are the same, that is, the switching cycles are... They are the same (g means Generating), let The duty cycle is , The duty cycle is (1- That is to say, when When conducting, Just shut it off; when When shut down, They are complementary in that they conduct electricity.

[0113] Voltage and The calculation relationships are as follows:

[0114] when Conductive, When turned off, inductor L stores power. The energy of L, and the current flowing through L are:

[0115] ;

[0116] when Turn off, When the circuit is turned on, the inductor L releases the stored energy, and the current flowing through L is:

[0117] ;

[0118] According to the principle of continuity of electric current,

[0119] ;

[0120] but,

[0121] ;

[0122] ;

[0123] ;

[0124] make , in yes Conduction time, yes The shutdown time is as follows:

[0125] (2);

[0126] From the above formula, we can see that... Under certain circumstances, along with It increases as it increases.

[0127] As can be seen from the above, when the car equipped with this device is in driving mode, the bus voltage of the input inverter can be boosted and bucked by controlling the duty cycle of a specific SiC in the buck-boost device. The target value of buck-boost is calculated according to formula (1).

[0128] When a car equipped with this device is in charging or energy recovery mode, the voltage of the input power battery can be boosted by controlling the duty cycle of a specific SiC in the boost converter, and the target value of boosting is calculated according to formula (2).

[0129] This application describes several embodiments, but these descriptions are exemplary and not restrictive, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0130] Any feature shown and / or discussed in this application may be implemented individually or in any suitable combination.

[0131] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. Other sequences of steps are possible, as will be understood by those skilled in the art.

[0132] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

Claims

1. A voltage boosting / buckling device for use in new energy vehicles, characterized in that, The boost / buck device includes a boost / buck circuit and a transistor controller; The boost / buck circuit is configured to output a first output voltage under the first control of the transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of an external power battery; the first output voltage is used to power the vehicle motor inverter. The transistor controller is configured to output a first control to the boost / buck circuit when the vehicle is in driving mode; the first control refers to controlling the turn-on and turn-off of the controllable devices of the boost / buck circuit itself. The boost / buck circuit includes a first capacitor, an inductor, a diode, a first transistor, a second transistor, a third transistor, and a second capacitor. The first terminal of the first capacitor serves as the first negative terminal of the boost / buck device; the second terminal of the first capacitor serves as the first positive terminal of the boost / buck device; the first terminal of the second capacitor serves as the second positive terminal of the boost / buck device; and the second terminal of the second capacitor serves as the second negative terminal of the boost / buck device. The first terminal of the first capacitor is connected to the anode of the diode and the first terminal of the second transistor, respectively; the second terminal of the second transistor is connected to the first terminal of the inductor and the first terminal of the second capacitor, respectively; the second terminal of the first capacitor is connected to the first terminal of the third transistor, respectively; the second terminal of the third transistor is connected to the first terminal of the first transistor and the second terminal of the inductor, respectively; the second terminal of the first transistor is connected to the cathode of the diode and the second terminal of the second capacitor, respectively.

2. The boost / deboss device as described in claim 1, characterized in that, The boost / buck circuit is further configured to output a second output voltage under the second control of the transistor controller, the second output voltage being greater than the second input voltage; the second input voltage is the voltage of the external charging pile; the second output voltage is used to charge the external power battery. The transistor controller is further configured to output a second control to the boost / buck circuit when the vehicle is in charging mode; the second control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

3. The boost / deboss device as described in claim 1, characterized in that, The transistor controller is specifically configured to, when the vehicle is in driving mode, i.e., when the first positive terminal and the first negative terminal of the boost / buck converter are connected to the positive and negative terminals of the power battery respectively, control the first transistor to turn off, the second transistor to turn on, and the third transistor to turn on, and control the first conduction coefficient; such that when the first conduction coefficient is less than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is less than the voltage of the power battery; and when the first conduction coefficient is greater than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is greater than the voltage of the power battery. The first conduction coefficient refers to the ratio of the conduction time of the second transistor and the third transistor to the sum of the conduction time of the second transistor and the third transistor and the turn-off time of the second transistor and the third transistor.

4. The boost / deboss device as described in claim 2, characterized in that, The transistor controller is specifically configured to, when the vehicle is in charging mode, i.e., when the second positive terminal and the second negative terminal of the boost / buck converter are connected to the positive and negative terminals of the charging pile respectively, control the second transistor to turn off, and the first transistor and the third transistor to turn on alternately, and control the second conduction coefficient; such that when the second conduction coefficient is greater than zero, the voltage between the first positive terminal and the first negative terminal of the boost / buck converter is greater than the voltage of the charging pile. The second conduction coefficient is the ratio of the conduction time of the first transistor to the sum of the conduction time of the first transistor and the turn-off time of the first transistor.

5. A boost / buck system for use in new energy vehicles, characterized in that, include: The system includes a boost / buck converter, a switching switch, an inverter, a charging pile, a power battery, and a switching switch controller; the boost / buck converter includes a boost / buck circuit and a transistor controller. The boost / buck circuit is configured to output a first output voltage under the first control of the transistor controller, the first output voltage being greater than or less than a first input voltage; the first input voltage is the voltage of the power battery; the first output voltage is used to power the inverter of the vehicle motor. The transistor controller is configured to output a first control to the boost / buck circuit when the vehicle is in driving mode; the first control refers to controlling the turn-on and turn-off of the controllable devices of the boost / buck circuit itself. The switching controller is configured to switch the switching switch to the inverter side when the vehicle is in driving mode, so that the boost / buck device is connected to the inverter; and to switch the switching switch to the charging pile side when the vehicle is in charging mode, so that the boost / buck device is connected to the charging pile. The boost / buck circuit includes a first capacitor, an inductor, a diode, a first transistor, a second transistor, a third transistor, and a second capacitor. The first terminal of the first capacitor serves as the first negative terminal of the boost / buck device; the second terminal of the first capacitor serves as the first positive terminal of the boost / buck device; the first terminal of the second capacitor serves as the second positive terminal of the boost / buck device; and the second terminal of the second capacitor serves as the second negative terminal of the boost / buck device. The first terminal of the first capacitor is connected to the anode of the diode and the first terminal of the second transistor, respectively; the second terminal of the second transistor is connected to the first terminal of the inductor and the first terminal of the second capacitor, respectively; the second terminal of the first capacitor is connected to the first terminal of the third transistor, respectively; the second terminal of the third transistor is connected to the first terminal of the first transistor and the second terminal of the inductor, respectively; the second terminal of the first transistor is connected to the cathode of the diode and the second terminal of the second capacitor, respectively.

6. The boost / buck system as described in claim 5, characterized in that, The boost / buck circuit is further configured to output a second output voltage under the second control of the transistor controller, the second output voltage being greater than the second input voltage; the second input voltage is the voltage of the charging pile; the second output voltage is used to charge the power battery. The transistor controller is further configured to output a second control to the boost / buck circuit when the vehicle is in charging mode; the second control refers to the on and off control of the controllable devices of the boost / buck circuit itself.

7. The boost / buck system as described in claim 6, characterized in that, The transistor controller is specifically configured to, when the vehicle is in driving mode, i.e., when the first positive terminal and the first negative terminal of the boost / buck converter are connected to the positive and negative terminals of the power battery respectively, control the first transistor to turn off, the second transistor to turn on, and the third transistor to turn on, and control the first conduction coefficient; such that when the first conduction coefficient is less than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is less than the voltage of the power battery; and when the first conduction coefficient is greater than 1 / 2, the voltage between the second positive terminal and the second negative terminal of the boost / buck converter is greater than the voltage of the power battery. The first conduction coefficient refers to the ratio of the conduction time of the second transistor and the third transistor to the sum of the conduction time of the second transistor and the third transistor and the turn-off time of the second transistor and the third transistor.

8. The boost / buck system as described in claim 6, characterized in that, The transistor controller is specifically configured to, when the vehicle is in charging mode, i.e., when the second positive terminal and the second negative terminal of the boost / buck converter are connected to the positive and negative terminals of the charging pile respectively, control the second transistor to turn off, and the first transistor and the third transistor to turn on alternately, and control the second conduction coefficient; such that when the second conduction coefficient is greater than zero, the voltage between the first positive terminal and the first negative terminal of the boost / buck converter is greater than the voltage of the charging pile. The second conduction coefficient is the ratio of the conduction time of the first transistor to the sum of the conduction time of the first transistor and the turn-off time of the first transistor.

9. The boost / buck system as described in claim 5, characterized in that, The switching switch includes two switching switches: a first switching switch and a second switching switch; each switching switch includes a stationary terminal, a first moving terminal, and a second moving terminal; The stationary terminal of the first switching switch is connected to the second positive terminal of the boost / buck converter; the first moving terminal of the first switching switch is connected to the positive terminal of the charging pile; and the second moving terminal of the first switching switch is connected to the positive input terminal of the inverter. The stationary terminal of the second switching switch is connected to the second negative terminal of the boost / buck device; the first moving terminal of the second switching switch is connected to the negative terminal of the charging pile; and the second moving terminal of the second switching switch is connected to the negative input terminal of the inverter.

10. The boost / buck system as described in claim 9, characterized in that, The switching controller is configured such that when the vehicle is in driving mode, the stationary terminal of the first switching switch is connected to the second moving terminal of the first switching switch, and the stationary terminal of the second switching switch is connected to the second moving terminal of the second switching switch; when the vehicle is in charging mode, the stationary terminal of the first switching switch is connected to the first moving terminal of the first switching switch, and the stationary terminal of the second switching switch is connected to the first moving terminal of the second switching switch.

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