Boost converter circuit and its control method, boost converter and vehicle

Abstract

This invention discloses a boost converter circuit and its control method, a boost converter, and a vehicle. The boost converter circuit includes: a first circuit for boosting the input voltage, comprising: a first energy storage device, a second energy storage device, a first capacitor, a second capacitor, a third capacitor, a first unidirectional conducting device, a second unidirectional conducting device, an electronically controlled switch, an AC power supply, and a load; and a second circuit connected to the first circuit, which controls the electronically controlled switch to control the output voltage of the first circuit. This invention solves the technical problem of low efficiency in boost converters caused by conduction losses of switching devices and diodes.

Description

Technical Field

[0001] This invention relates to the field of boost converters, and more specifically, to a boost converter circuit and its control method, a boost converter, and a vehicle. Background Technology

[0002] With the rapid development of new energy technologies, the number of electric vehicles is increasing year by year, and their proportion is becoming increasingly higher. Electric vehicles use high-voltage power batteries to store electrical energy and require chargers for charging. Electric vehicle chargers are divided into two types: on-board chargers and external chargers. Chargers can convert alternating current (AC) to direct current (DC) to charge the power battery.

[0003] Existing electric vehicle chargers generally use AC-DC converters to boost the input voltage. However, in existing boost circuits, the switching devices and diodes have significant conduction losses, which leads to low converter efficiency. Summary of the Invention

[0004] This invention provides a boost converter circuit and its control method, a boost converter, and a vehicle, to at least solve the technical problem of low efficiency of boost converters caused by conduction losses of switching devices and diodes.

[0005] According to a first aspect of the present invention, a boost converter circuit is provided for use in an electric vehicle, comprising:

[0006] A first circuit, used to boost the input voltage, includes: a first energy storage device, a second energy storage device, a first capacitor, a second capacitor, a third capacitor, a first unidirectional conductor, a second unidirectional conductor, an electronically controlled switch, an AC power supply, and a load. The first terminal of the first energy storage device is connected to the first terminal of the AC power supply; the second terminal of the first energy storage device is connected to the first terminal of the first capacitor; the first terminal of the electronically controlled switch is connected to the second terminal of the first energy storage device; the second terminal of the electronically controlled switch is connected to the second terminal of the AC power supply; the second terminal of the first capacitor is connected to the first terminal of the first unidirectional conductor; and the first terminal of the second energy storage device is connected to the second terminal of the first capacitor. The second end of the second energy storage device is connected to the second end of the electronic control switch; the second end of the first unidirectional conductor is connected to the first end of the second capacitor; the second end of the second capacitor is connected to the second end of the second energy storage device; the second end of the second unidirectional conductor is connected to the second end of the first capacitor; the first end of the second unidirectional conductor is connected to the first end of the third capacitor; the second end of the third capacitor is connected to the second end of the second energy storage device; the first end of the load is connected to the first end of the second capacitor; the second end of the load is connected to the first end of the third capacitor; a second circuit is connected to the first circuit and is used to control the electronic control switch to control the output voltage of the first circuit.

[0007] Optionally, the second circuit includes a voltage sampling module, a difference calculation module, a voltage supply module, a linear controller, a limiter, a comparator, and a carrier generator. The voltage sampling module samples the output voltage of the first circuit, the difference calculation module calculates the difference between the output voltage of the first circuit and the target voltage, the first output terminal of the voltage sampling module is connected to the first terminal of the load, the second input terminal of the voltage sampling module is connected to the second terminal of the load, the output terminal of the voltage sampling module is connected to the first output terminal of the difference calculation module, the second input terminal of the difference calculation module is connected to the output terminal of the voltage supply module, the output terminal of the difference calculation module is connected to the input terminal of the linear controller, the output terminal of the linear controller is connected to the input terminal of the limiter, the output terminal of the limiter is connected to the first input terminal of the comparator, the second input terminal of the comparator is connected to the output terminal of the carrier generator, and the output terminal of the comparator is connected to an electronically controlled switch.

[0008] Optionally, the electronically controlled switch includes a first switch and a second switch, the first switch and the second switch being field-effect transistors, the drain of the first switch being connected to the second terminal of the first energy storage device, the source of the first switch being connected to the source of the second switch, the drain of the second switch being connected to the second terminal of the AC power supply, and the gates of the first switch and the second switch being connected to the second circuit.

[0009] Optionally, the first circuit further includes a fourth capacitor, with a first terminal connected to a first terminal of the load and a second terminal connected to a second terminal of the load.

[0010] Optionally, the first energy storage device and / or the second energy storage device are inductors.

[0011] Optionally, the first unidirectional conductor and / or the second unidirectional conductor are diodes.

[0012] According to a second aspect of the present invention, a boost converter circuit control method is also provided, for controlling the boost converter circuit of any one of the first aspects of the present invention, comprising:

[0013] Obtain the output voltage by acquiring the voltage across the load terminals; determine the difference between the output voltage and the preset target voltage; determine the pulse width modulation signal based on the difference; compare the pulse width modulation signal with the preset sawtooth wave to obtain the target control signal; control the electronic switch according to the target control signal.

[0014] Optionally, determining the pulse width modulation signal based on the difference includes: determining the pulse width modulation signal using a linear controller based on the difference.

[0015] According to a third aspect of the present invention, a boost converter is also provided, including any of the boost converter circuits provided in the first aspect of the present invention.

[0016] According to a fourth aspect of the present invention, a vehicle is also provided, the vehicle including the boost converter provided in the third aspect of the present invention.

[0017] In this embodiment of the invention, the boost converter circuit includes a first circuit and a second circuit. The first circuit is used to boost the input voltage. The first circuit includes: a first energy storage device, a second energy storage device, a first capacitor, a second capacitor, a third capacitor, a first unidirectional conductor, a second unidirectional conductor, an electronically controlled switch, an AC power supply, and a load. The first terminal of the first energy storage device is connected to the first terminal of the AC power supply, the second terminal of the first energy storage device is connected to the first terminal of the first capacitor, the first terminal of the electronically controlled switch is connected to the second terminal of the first energy storage device, the second terminal of the electronically controlled switch is connected to the second terminal of the AC power supply, and the second terminal of the first capacitor is connected to the first terminal of the second capacitor. A first unidirectional conducting element is connected to the first terminal of a first capacitor, a second energy storage element is connected to the first terminal of a first capacitor, a second energy storage element is connected to the second terminal of an electronically controlled switch, a first unidirectional conducting element is connected to the first terminal of a second capacitor, a second capacitor is connected to the second terminal of a second energy storage element, a second unidirectional conducting element is connected to the second terminal of a first capacitor, a second unidirectional conducting element is connected to the first terminal of a third capacitor, a third capacitor is connected to the second terminal of a second energy storage element, a load is connected to the first terminal of a second capacitor, and a load is connected to the first terminal of a third capacitor. A second circuit is connected to the first circuit and is used to control the electronically controlled switch to control the output voltage of the first circuit. By controlling the electronically controlled switch in the first circuit through the second circuit, the electronically controlled switch can be kept in operation only at certain times during the entire operation of the boost converter. At any given time, at most one of the first and second unidirectional conducting elements is in operation, thus solving the technical problem of low efficiency in boost converters caused by the conduction losses of switching devices and diodes. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a circuit diagram of a boost converter circuit according to one embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the first circuit in the boost converter circuit according to one embodiment of the present invention, in the first stage of the positive half-cycle of the AC power supply.

[0021] Figure 3 This is a schematic diagram of the first circuit in the boost converter circuit according to one embodiment of the present invention, in the second stage of the positive half-cycle of the AC power supply.

[0022] Figure 4 This is a schematic diagram of the first circuit in the boost converter circuit according to one embodiment of the present invention, in the third stage of the positive half-cycle of the AC power supply.

[0023] Figure 5 This is a schematic diagram of the first circuit in the boost converter circuit according to one embodiment of the present invention, in the first stage of the negative half-cycle of the AC power supply.

[0024] Figure 6 This is a schematic diagram of the first circuit in the boost converter circuit according to one embodiment of the present invention, in the second stage of the negative half-cycle of the AC power supply.

[0025] Figure 7 This is a schematic flowchart of a boost converter circuit control method according to one embodiment of the present invention.

[0026] Figure reference numerals: AC power supply Vin; first energy storage device Lin; second energy storage device Lo; first capacitor Ct; second capacitor C1; third capacitor C2; fourth capacitor Co; load R; first switch S1; second switch S2; first unidirectional conduction device D1; second unidirectional conduction device D2; voltage sampling module 1; difference calculation module 2; voltage supply module 3; linear controller 4; limiter 5; comparator 6; carrier generator 7; drive circuit 8. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Reference Figure 1 , Figure 1 This is a circuit diagram of a boost converter circuit according to one embodiment of the present invention. The boost converter circuit provided in this embodiment is applied to an electric vehicle and includes: a first circuit for boosting the input voltage. The first circuit includes: a first energy storage device Lin, a second energy storage device Lo, a first capacitor Ct, a second capacitor C1, a third capacitor C2, a first unidirectional conductor D1, a second unidirectional conductor D2, an electronic control switch, an AC power supply Vin, and a load R. The first terminal of the first energy storage device Lin is connected to the first terminal of the AC power supply Vin, the second terminal of the first energy storage device Lin is connected to the first terminal of the first capacitor Ct, the first terminal of the electronic control switch is connected to the second terminal of the first energy storage device Lin, the second terminal of the electronic control switch is connected to the second terminal of the AC power supply Vin, and the second terminal of the first capacitor Ct is connected to the first unidirectional conductor D2. The first end of component D1 is connected to the first terminal of the second energy storage component Lo, which is connected to the second terminal of the first capacitor Ct. The second terminal of the second energy storage component Lo is connected to the second terminal of the electronic control switch. The second terminal of the first unidirectional conductor D1 is connected to the first terminal of the second capacitor C1, which is connected to the second terminal of the second energy storage component Lo. The second terminal of the second unidirectional conductor D2 is connected to the second terminal of the first capacitor Ct. The first terminal of the second unidirectional conductor D2 is connected to the first terminal of the third capacitor C2, which is connected to the second terminal of the second energy storage component Lo. The first terminal of the load R is connected to the first terminal of the second capacitor C1, which is connected to the first terminal of the third capacitor C2. A second circuit is connected to the first circuit and is used to control the electronic control switch to control the output voltage of the first circuit.

[0030] Specifically, the current in the first unidirectional conductor D1 and the second unidirectional conductor D2 can only flow from the first terminal to the second terminal. The electronically controlled switch can achieve forward and reverse conduction under the control of the second circuit.

[0031] It should be noted that the second circuit controls the electronic switch to control the output voltage of the first circuit by controlling the duty cycle of the electronic switch. Different duty cycles of the electronic switch output by the second circuit will result in different output voltages of the first circuit.

[0032] It should be noted that the electronically controlled switch can achieve both bidirectional conduction and blocking.

[0033] In this embodiment of the invention, the boost converter circuit includes a first circuit and a second circuit. The first circuit is used to boost the input voltage. The first circuit includes: a first energy storage device Lin, a second energy storage device Lo, a first capacitor Ct, a second capacitor C1, a third capacitor C2, a first unidirectional conductor D1, a second unidirectional conductor D2, an electronically controlled switch, an AC power supply Vin, and a load R. The first terminal of the first energy storage device Lin is connected to the first terminal of the AC power supply Vin, the second terminal of the first energy storage device Lin is connected to the first terminal of the first capacitor Ct, the first terminal of the electronically controlled switch is connected to the second terminal of the first energy storage device Lin, and the second terminal of the electronically controlled switch is connected to the second terminal of the AC power supply Vin. The second terminal of the first capacitor Ct... The first circuit is connected to the first terminal of the first unidirectional conductor D1; the first terminal of the second energy storage component Lo is connected to the second terminal of the first capacitor Ct; the second terminal of the second energy storage component Lo is connected to the second terminal of the electronic control switch; the second terminal of the first unidirectional conductor D1 is connected to the first terminal of the second capacitor C1; the second terminal of the second capacitor C1 is connected to the second terminal of the second energy storage component Lo; the second terminal of the second unidirectional conductor D2 is connected to the second terminal of the first capacitor Ct; the first terminal of the second unidirectional conductor D2 is connected to the first terminal of the third capacitor C2; the second terminal of the third capacitor C2 is connected to the second terminal of the second energy storage component Lo; the first terminal of the load R is connected to the first terminal of the second capacitor C1; and the second terminal of the load R is connected to the first terminal of the third capacitor C2. The second circuit is connected to the first circuit and is used to control the electronic control switch to control the output voltage of the first circuit. By controlling the electronically controlled switch in the first circuit through the second circuit, the electronically controlled switch can be made to be in working state only at part of the entire operation of the boost converter. At any given time, at most one of the first unidirectional conducting element D1 and the second unidirectional conducting element D2 is in working state, thereby solving the technical problem of low efficiency of boost converter caused by the conduction loss of switching devices and diodes.

[0034] Optionally, the second circuit includes a voltage sampling module 1, a difference calculation module 2, a voltage supply module 3, a linear controller 4, a limiter 5, a comparator 6, and a carrier generator 7. The voltage sampling module 1 samples the output voltage of the first circuit, the difference calculation module 2 calculates the difference between the output voltage of the first circuit and the target voltage, the first output terminal of the voltage sampling module 1 is connected to the first terminal of the load R, the second input terminal of the voltage sampling module 1 is connected to the second terminal of the load R, the output terminal of the voltage sampling module 1 is connected to the first output terminal of the difference calculation module 2, the second input terminal of the difference calculation module 2 is connected to the output terminal of the voltage supply module 3, the output terminal of the difference calculation module 2 is connected to the input terminal of the linear controller 4, the output terminal of the linear controller 4 is connected to the input terminal of the limiter 5, the output terminal of the limiter 5 is connected to the first input terminal of the comparator 6, the second input terminal of the comparator 6 is connected to the output terminal of the carrier generator 7, and the output terminal of the comparator 6 is connected to an electronically controlled switch.

[0035] Specifically, voltage sampling module 1 includes a voltage sampling circuit that can sample the voltage across the load R in real time. Difference calculation module 2 includes a difference calculation circuit with two inputs: one is the voltage across the load R obtained by the voltage sampling circuit, reduced by a preset ratio; the other is the voltage provided by the voltage supply module 3, which outputs the target voltage to be achieved by the first circuit, reduced by a preset ratio. The difference calculation circuit can output the difference between the two input voltages.

[0036] Linear controller 4 can be a PI (Proportional Integral) controller. The PI controller calculates the control deviation based on the given value and the actual output value, and then linearly combines the proportional and integral values ​​of the deviation to form the control quantity, thereby controlling the controlled object. In the second circuit of this invention, linear controller 4 takes the difference output by difference calculation module 2 as its output, processes it through the PI controller, and outputs a control signal.

[0037] Limiter 5 is a circuit that can flatten the amplitude of signal voltage within a defined range. The function of the limiting circuit is to limit the amplitude of the output signal within a certain range; that is, when the output voltage exceeds or falls below a certain reference value, the output voltage will be limited to the limiting level and will no longer change with voltage. In this invention, the limiter 5 of the second circuit is used to limit the amplitude of the control signal output by the linear controller 4.

[0038] Comparator 6 is a circuit that compares an analog voltage signal with a reference voltage signal. The two inputs of comparator 6 are analog signals, and the output is a binary signal of 0 or 1. In this invention, comparator 6 in the second circuit is used to process the control signal from the amplitude converter and the carrier signal generated by the carrier generator 7, thereby outputting a binary signal.

[0039] It should be noted that at the end of the second circuit, a drive circuit 8 is also provided. The drive circuit 8 is used to control the electronically controlled switch according to the binary signal output by the comparator 6.

[0040] Optionally, the electronically controlled switch includes a first switch S1 and a second switch S2. The first switch S1 and the second switch S2 are field-effect transistors. The drain of the first switch S1 is connected to the second terminal of the first energy storage device Lin. The source of the first switch S1 is connected to the source of the second switch S2. The drain of the second switch S2 is connected to the second terminal of the AC power supply Vin. The gates of the first switch S1 and the second switch S2 are connected to the second circuit.

[0041] Specifically, the electronic control switch uses two field-effect transistor switches with opposite wiring methods, thereby achieving bidirectional blocking of the entire electronic control switch.

[0042] Optionally, the first circuit further includes a fourth capacitor Co, with the first terminal of the fourth capacitor Co connected to the first terminal of the load R, and the second terminal of the fourth capacitor Co connected to the second terminal of the load R.

[0043] Specifically, the fourth capacitor Co, connected in parallel across the load R, is used to reduce the AC ripple coefficient. The fourth capacitor Co in this invention is an electrolytic capacitor with a relatively large capacitance.

[0044] Optionally, the first energy storage device Lin and / or the second energy storage device Lo are inductors.

[0045] An inductor can convert electrical energy into magnetic energy and store it. In the first circuit, the inductor can store and release energy. When releasing energy, it can increase the voltage across the load R, giving the first circuit a boosting effect.

[0046] Optionally, the first unidirectional conductor D1 and / or the second unidirectional conductor D2 are diodes.

[0047] Specifically, a diode is an electronic device made of semiconductor material that has the characteristic of unidirectional conductivity.

[0048] It should be noted that the boost converter circuit provided by this invention includes a first stage, a second stage, and a third stage in both the positive and negative half-cycles of the AC power supply Vin, with each stage corresponding to a different operating state of the circuit. It is important to note that the positive or negative half-cycle of the AC power supply Vin includes multiple first, second, and third stages.

[0049] Reference Figure 2 , Figure 2 This is a schematic diagram of the first circuit in a boost converter circuit according to one embodiment of the present invention, operating in the first stage of the positive half-cycle of the AC power supply Vin. Specifically, when the AC power supply Vin is in the positive half-cycle, the circuit state corresponding to the first stage is that the first switch S1 and the second switch S2 receive high-level signals and are turned on. The AC power supply Vin provides energy to the first energy storage device Lin, and the first capacitor Ct provides energy to the second energy storage device Lo. In this stage, current flows through the first unidirectional conductor D1, and no current flows through the second unidirectional conductor D2.

[0050] Reference Figure 3 , Figure 3This is a schematic diagram of the first circuit in a boost converter circuit according to one embodiment of the present invention, operating in the second stage of the positive half-cycle of the AC power supply Vin. Specifically, when the AC power supply Vin is in the positive half-cycle, the circuit state corresponding to the second stage is that the first switch S1 and the second switch S2 are turned off upon receiving a low-level signal. The energy stored in the first energy storage device Lin and the second energy storage device Lo is provided to the load R through the first unidirectional conductor D1, while the first capacitor Ct and the second capacitor C1 are charged. In this stage, current flows through the first unidirectional conductor D1, while no current flows through the second unidirectional conductor D2.

[0051] Reference Figure 4 , Figure 4 This is a schematic diagram of the first circuit in a boost converter circuit according to one embodiment of the present invention, operating in the third stage of the positive half-cycle of the AC power supply Vin. Specifically, when the AC power supply Vin is in the positive half-cycle, the circuit state corresponding to the third stage is as follows: the first switch S1 and the second switch S2 are turned off upon receiving a low-level signal; after the energy stored in the first energy storage device Lin and the second energy storage device Lo is released, the second capacitor C1 provides energy to the load R; and the fourth capacitor Co is used to stabilize the output voltage of the first circuit. During this stage, no current flows through the first unidirectional conductor D1 and the second unidirectional conductor D2.

[0052] Reference Figure 5 , Figure 5 This is a schematic diagram of the first circuit in a boost converter circuit according to one embodiment of the present invention, operating in the first stage of the negative half-cycle of the AC power supply Vin. Specifically, when the AC power supply Vin is in the negative half-cycle, the circuit state corresponding to the first stage is that the first switch S1 and the second switch S2 receive high-level signals and are turned on. The AC power supply Vin provides energy to the first energy storage device Lin, and the first capacitor Ct provides energy to the second energy storage device Lo. In this stage, the second unidirectional conductor D2 has current flowing through it, while the first unidirectional conductor D1 has no current flowing through it.

[0053] Reference Figure 6 , Figure 6 This is a schematic diagram of the first circuit in a boost converter circuit according to one embodiment of the present invention, operating in the second stage of the negative half-cycle of the AC power supply Vin. Specifically, when the AC power supply Vin is in the negative half-cycle, the circuit state corresponding to the second stage is that the first switch S1 and the second switch S2 are turned off upon receiving a low-level signal. The energy stored in the first energy storage device Lin and the second energy storage device Lo is provided to the load R through the second unidirectional conductor D2, while the first capacitor Ct and the third capacitor C2 are charged. In this stage, current flows through the second unidirectional conductor D2, and no current flows through the first unidirectional conductor D1.

[0054] Reference Figure 4The schematic diagram of the first circuit operating in the third stage of the negative half-cycle of the AC power supply Vin is the same as that of the first circuit operating in the third stage of the positive half-cycle of the AC power supply Vin. Specifically, when the AC power supply Vin is in the negative half-cycle, the circuit state corresponding to the third stage is as follows: the first switch S1 and the second switch S2 are turned off upon receiving a low-level signal; after the energy stored in the first energy storage device Lin and the second energy storage device Lo is released, the third capacitor C2 provides energy to the load R; and the fourth capacitor Co is used to stabilize the output voltage of the first circuit. During this stage, no current flows through the first unidirectional conductor D1 and the second unidirectional conductor D2.

[0055] It should be noted that, in the above appendix Figure 2 To be continued Figure 6 In the corresponding first circuit, the first unidirectional conductor D1, the second unidirectional conductor D2, the first switch S1 and the second switch S2, which have no current flowing through them, are equivalent to not being connected to the circuit, and are not shown in the attached figure.

[0056] According to an embodiment of the present invention, an embodiment of a boost converter circuit control method is provided, referring to... Figure 7 , Figure 7 This is a schematic flowchart of a boost converter circuit control method according to one embodiment of the present invention, as shown below. Figure 7 As shown, this method is used to control the boost converter circuit provided in any embodiment of the present invention, and specifically includes the following steps:

[0057] It should be noted that, in this invention, the following specific control steps are executed based on the second circuit in the boost converter circuit.

[0058] Step S101: Obtain the voltage across the load R to get the output voltage.

[0059] Specifically, the voltage sampling module 1 in the second circuit constantly collects the voltage across the load R to obtain the output voltage of the first circuit.

[0060] Step S102: Determine the difference between the output voltage and the preset target voltage.

[0061] Specifically, the difference calculation module 2 in the second circuit calculates the difference between the output voltage and the preset target voltage, wherein the preset target voltage is provided by the voltage supply module 3 in the second circuit.

[0062] It should be noted that the output voltage is the voltage across the load R reduced according to a preset ratio.

[0063] Step S103: Determine the pulse width modulation signal based on the difference.

[0064] Specifically, in some embodiments of the present invention, the pulse width modulation signal is determined by the linear controller 4, and the difference is used as the input of the linear controller 4. The linear controller 4 can perform a series of processes based on the difference to obtain the pulse width modulation signal.

[0065] It is understandable that the pulse width modulation signal is the same signal as the control signal output by the PI regulator mentioned above.

[0066] Step S104: Compare the pulse width modulation signal with the preset sawtooth wave to obtain the target control signal.

[0067] Specifically, the pulse width modulation signal is reduced in amplitude by an amplitude demultiplexer and then compared with a preset sawtooth wave by comparator 6 to obtain the target control signal. The preset sawtooth wave is output from carrier generator 7 to comparator 6, and the target control signal is a binary signal of 0 or 1.

[0068] Step S105: Control the electronic switch according to the target control signal.

[0069] Specifically, the drive circuit 8 in the second circuit controls the on / off state of the electronically controlled switch according to the target control signal.

[0070] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0071] Embodiments of the present invention also provide a boost converter, including the boost converter circuit provided in any embodiment of the present invention.

[0072] Optionally, in some embodiments, a boost converter including the boost converter circuit provided by the present invention can perform the following steps:

[0073] Step S101: Obtain the voltage across the load R to get the output voltage.

[0074] Step S102: Determine the difference between the output voltage and the preset target voltage.

[0075] Step S103: Determine the pulse width modulation signal based on the difference.

[0076] Step S104: Compare the pulse width modulation signal with the preset sawtooth wave to obtain the target control signal.

[0077] Step S105: Control the electronic switch according to the target control signal.

[0078] Embodiments of the present invention also provide a vehicle that includes the boost converter provided in the above embodiments.

[0079] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0080] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0081] In some embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The circuit embodiments described above are merely illustrative; for example, the division of modules can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be indirect couplings or communication connections through interfaces, units, or modules, and may be electrical or other forms.

[0082] The modules described as separate components may or may not be physically separate. Similarly, the components shown may or may not be physical units; they may be located in one place or distributed across multiple modules. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0083] In addition, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0084] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0085] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A boost converter circuit for use in electric vehicles, characterized in that, include: A first circuit, used to boost the input voltage, includes: a first energy storage device, a second energy storage device, a first capacitor, a second capacitor, a third capacitor, a first unidirectional conductor, a second unidirectional conductor, an electronically controlled switch, an AC power supply, and a load. The first terminal of the first energy storage device is connected to the first terminal of the AC power supply; the second terminal of the first energy storage device is connected to the first terminal of the first capacitor; the first terminal of the electronically controlled switch is connected to the second terminal of the first energy storage device; the second terminal of the electronically controlled switch is connected to the second terminal of the AC power supply; the second terminal of the first capacitor is connected to the first terminal of the first unidirectional conductor; and the second... The first end of the energy storage device is connected to the second end of the first capacitor, the second end of the second energy storage device is connected to the second end of the electronic control switch, the second end of the first unidirectional conduction device is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the second end of the second energy storage device, the second end of the second unidirectional conduction device is connected to the second end of the first capacitor, the first end of the second unidirectional conduction device is connected to the first end of the third capacitor, the second end of the third capacitor is connected to the second end of the second energy storage device, the first end of the load is connected to the first end of the second capacitor, and the second end of the load is connected to the first end of the third capacitor. A second circuit is connected to the first circuit, and the second circuit is used to control the electronically controlled switch to control the output voltage of the first circuit.

2. The boost converter circuit according to claim 1, characterized in that, The second circuit includes a voltage sampling module, a difference calculation module, a voltage supply module, a linear controller, a limiter, a comparator, and a carrier generator. The voltage sampling module samples the output voltage of the first circuit. The difference calculation module calculates the difference between the output voltage of the first circuit and a target voltage. The first input terminal of the voltage sampling module is connected to the first terminal of the load, and the second input terminal is connected to the second terminal of the load. The output terminal of the voltage sampling module is connected to the first input terminal of the difference calculation module, the second input terminal of the difference calculation module is connected to the output terminal of the voltage supply module, the output terminal of the difference calculation module is connected to the input terminal of the linear controller, the output terminal of the linear controller is connected to the input terminal of the limiter, the output terminal of the limiter is connected to the first input terminal of the comparator, the second input terminal of the comparator is connected to the output terminal of the carrier generator, and the output terminal of the comparator is connected to the electronically controlled switch.

3. The boost converter circuit according to claim 1, characterized in that, The electronically controlled switch includes a first switch and a second switch, both of which are field-effect transistors. The drain of the first switch is connected to the second terminal of the first energy storage device, the source of the first switch is connected to the source of the second switch, the drain of the second switch is connected to the second terminal of the AC power supply, and the gates of the first and second switches are connected to the second circuit.

4. The boost converter circuit according to claim 1, characterized in that, The first circuit further includes a fourth capacitor, the first end of which is connected to the first end of the load, and the second end of which is connected to the second end of the load.

5. The boost converter circuit according to claim 1, characterized in that, The first energy storage device and / or the second energy storage device are inductors.

6. The boost converter circuit according to claim 1, characterized in that, The first unidirectional conductor and / or the second unidirectional conductor are diodes.

7. A method for controlling a boost converter circuit, characterized in that, For controlling the boost converter circuit according to any one of claims 1 to 6, comprising: The output voltage is obtained by measuring the voltage across the load. Determine the difference between the output voltage and the preset target voltage; Based on the difference, the pulse width modulation signal is determined; The target control signal is obtained by comparing the pulse width modulation signal with a preset sawtooth wave. The electronically controlled switch is controlled according to the target control signal.

8. The boost converter circuit control method according to claim 7, characterized in that, Determining the pulse width modulation signal based on the difference includes: determining the pulse width modulation signal using a linear controller based on the difference.

9. A boost converter, characterized in that, The boost converter circuit includes any one of claims 1 to 6.

10. A vehicle, characterized in that, Includes the boost converter as described in claim 9.

Images