Bus voltage control method and device of converter, related equipment and medium

Abstract

The invention relates to a bus voltage control method and device of a converter, related equipment and a medium. The converter is used for converting an input alternating-current electric signal into a direct-current electric signal and comprises a high-frequency bridge arm, a power-frequency bridge arm, a filter capacitor, a transformer unit and a rectifying circuit unit, and the method comprises the following steps: determining a first reference carrier signal; according to the peak voltage of the alternating current signal and a preset voltage threshold value, the duty ratio of a driving signal used for controlling the high-frequency bridge arm to work is determined, and the voltage threshold value is smaller than or equal to the withstand voltage value of a power device included in the converter; and generating a first driving signal for controlling the high-frequency bridge arm to work according to the first reference carrier signal and the duty ratio, and controlling the high-frequency bridge arm to work by using the first driving signal, so that the bus voltage is smaller than or equal to the voltage threshold. Therefore, the bus voltage of the converter is controlled to be lower than the preset voltage threshold value through software, and the service life and the safety of the converter are not affected. In addition, a device with a high withstand voltage value does not need to be replaced, and hardware cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a bus voltage control method, apparatus, related equipment, and medium of a converter. Background Art

[0002] An electric vehicle's onboard charger (OBC) converts AC power to DC power to charge the vehicle's power battery. The OBC has a built-in converter for converting AC power to DC power. Currently, isolated AC-DC converters typically use a two-stage structure, consisting of a first-stage power factor correction topology and a second-stage resonant topology. The presence of a busbar electrolytic capacitor between the first-stage power factor correction topology and the second-stage resonant topology limits power density improvements.

[0003] To find a more efficient topology, a single-stage topology can be designed to eliminate the electrolytic capacitors in the busbar. However, a single-stage topology boosts the voltage from the AC input to the busbar. For example, in a dual-active-bridge (DAB) topology, the high-frequency bridge arm transmits the maximum power when operating at a fixed duty cycle of 0.5. However, the high busbar voltage in this case can damage the power devices, affecting the lifespan and safety of the converter. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a bus voltage control method, apparatus, related equipment and medium of a converter.

[0005] According to a first aspect of an embodiment of the present disclosure, a bus voltage control method for a converter is provided. The converter is configured to convert an input AC power signal into a DC power signal for charging a battery. The converter includes a high-frequency bridge arm, an industrial frequency bridge arm, a filter capacitor, a transformer unit, and a rectifier circuit unit. The method includes:

[0006] determining a first reference carrier signal;

[0007] Determining a duty cycle of a drive signal for controlling the operation of the high-frequency bridge arm based on a peak voltage of the alternating current signal and a preset voltage threshold, wherein the voltage threshold is less than or equal to a withstand voltage of a power device included in the converter;

[0008] A first drive signal for controlling the operation of the high-frequency bridge arm is generated according to the first reference carrier signal and the duty cycle, and the operation of the high-frequency bridge arm is controlled by using the first drive signal so that the bus voltage is less than or equal to the voltage threshold.

[0009] Optionally, generating a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the duty cycle includes:

[0010] generating a reference signal according to the duty cycle and the first reference carrier signal, wherein the amplitude of the reference signal does not change with time;

[0011] A first driving signal for controlling the operation of the high-frequency bridge arm is generated according to the first reference carrier signal and the reference signal.

[0012] Optionally, the high-frequency bridge arm includes a first bridge arm and a second bridge arm; the first bridge arm includes a first power device and a second power device, the first power device is located in the upper bridge arm of the first bridge arm, and the second power device is located in the lower bridge arm of the first bridge arm; the second bridge arm includes a third power device and a fourth power device, the third power device is located in the upper bridge arm of the second bridge arm, and the fourth power device is located in the lower bridge arm of the second bridge arm;

[0013] Generating a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the reference signal includes:

[0014] Inputting the first reference carrier signal into a negative input terminal of a first comparator and inputting the reference signal into a positive input terminal of the first comparator to obtain a first sub-driving signal output by the first comparator for driving the first power device and the fourth power device;

[0015] The first sub-driving signal is input into a first inverter to obtain a second sub-driving signal output by the first inverter for driving the second power device and the third power device.

[0016] Optionally, the cycle of the AC signal includes a positive half-cycle and a negative half-cycle; the power frequency bridge arm includes a fifth power device and a sixth power device, the fifth power device is located in an upper bridge arm of the power frequency bridge arm, and the sixth power device is located in a lower bridge arm of the power frequency bridge arm; the method further includes:

[0017] In the positive half cycle, controlling the sixth power device to be turned on and the fifth power device to be turned off;

[0018] In the negative half cycle, the sixth power device is controlled to be turned off and the fifth power device is controlled to be turned on.

[0019] Optionally, when the transformer unit includes a phase-shifting inductor and a transformer, determining the first reference carrier signal includes:

[0020] A first reference carrier signal is determined according to a preset pulse width modulation duty cycle and a count value.

[0021] Optionally, the method further includes:

[0022] Acquiring electrical parameters of the converter, the electrical parameters including a current voltage value of the battery, a target voltage value of the battery, a phase angle of the AC signal, and a current value of the AC signal input to the converter;

[0023] generating a second reference carrier signal according to the electrical parameter and the first reference carrier signal, wherein the second reference carrier signal is phase delayed with respect to the first reference carrier signal;

[0024] Generate a modulation signal according to the phase angle of the AC signal and a preset coefficient, where the preset coefficient has a value range of [0, 0.5];

[0025] A second driving signal for controlling the operation of the rectifier circuit unit is generated according to the second reference carrier signal and the modulation signal.

[0026] Optionally, the rectifier circuit unit includes a third bridge arm and a fourth bridge arm, the third bridge arm includes a seventh power device and an eighth power device, the seventh power device is located in an upper bridge arm of the third bridge arm, and the eighth power device is located in a lower bridge arm of the third bridge arm, the fourth bridge arm includes a ninth power device and a tenth power device, the ninth power device is located in an upper bridge arm of the fourth bridge arm, and the tenth power device is located in a lower bridge arm of the fourth bridge arm;

[0027] Generating a second drive signal for controlling the operation of the rectifier circuit unit according to the second reference carrier signal and the modulation signal includes:

[0028] Inputting the second reference carrier signal into the negative input terminal of the second comparator and inputting the modulated signal into the positive input terminal of the second comparator to obtain a third sub-driving signal output by the second comparator for driving the seventh power device;

[0029] inputting the third sub-driving signal into the second inverter to obtain a fourth sub-driving signal output by the second inverter for driving the eighth power device;

[0030] Input the modulated signal to the positive input terminal of the third comparator, shift the second reference carrier signal by 180 degrees and input it to the negative input terminal of the third comparator, to obtain a fifth sub-driving signal output by the third comparator for driving the ninth power device;

[0031] The fifth sub-driving signal is input into the third inverter to obtain a sixth sub-driving signal output by the third inverter and used for driving the tenth power device.

[0032] Optionally, generating a second reference carrier signal according to the electrical parameter and the first reference carrier signal includes:

[0033] determining a target current value of a power factor correction circuit according to a current voltage value of the battery, a target voltage value of the battery, and a sine value of a phase angle of the alternating current signal, wherein the power factor correction circuit includes the high-frequency bridge arm and the power-frequency bridge arm;

[0034] determining a phase shift of a reference carrier signal according to the target current value and the current value of the AC signal;

[0035] A second reference carrier signal is generated according to the shifted phase of the reference carrier signal and the first reference carrier signal.

[0036] Optionally, when the transformer unit includes a resonant inductor, a transformer primary resonant capacitor, a transformer secondary resonant capacitor, and a transformer, determining the first reference carrier signal includes:

[0037] Obtaining a first current value according to a current voltage value of the battery and a target voltage value of the battery;

[0038] Obtaining a frequency control parameter according to the first current value and the current value of the alternating current signal, wherein the frequency control parameter can indicate the frequency of a first reference carrier signal to be generated;

[0039] The first reference carrier signal is generated according to the frequency control parameter, and the frequency of the first reference carrier signal changes with the current value of the alternating current signal.

[0040] Optionally, the method further includes:

[0041] A third driving signal for controlling the operation of the rectifier circuit unit is generated according to the phase angle of the AC signal and the first driving signal.

[0042] According to a second aspect of an embodiment of the present disclosure, a bus voltage control device for a converter is provided. The converter is configured to convert an input AC power signal into a DC power signal for charging a battery. The converter includes a high-frequency bridge arm, an industrial frequency bridge arm, a filter capacitor, a transformer unit, and a rectifier circuit unit. The device includes:

[0043] A first determining module is configured to determine a first reference carrier signal;

[0044] a second determining module configured to determine a duty cycle of a driving signal for controlling the operation of the high-frequency bridge arm based on a peak voltage of the alternating current signal and a preset voltage threshold, wherein the voltage threshold is less than or equal to a withstand voltage value of a power device included in the converter;

[0045] The first generating module is configured to generate a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the duty cycle, and use the first driving signal to control the operation of the high-frequency bridge arm so that the bus voltage is less than or equal to the voltage threshold.

[0046] According to a third aspect of an embodiment of the present disclosure, there is provided a control device, including:

[0047] processor;

[0048] a memory for storing processor-executable instructions;

[0049] The processor is configured to execute the instructions to implement the steps of the bus voltage control method of the converter described in the first aspect of the embodiment of the present disclosure.

[0050] According to a fourth aspect of the embodiments of the present disclosure, there is provided a vehicle-mounted charger, comprising: a converter and the control device according to the first aspect of the embodiments of the present disclosure.

[0051] According to a fifth aspect of the embodiments of the present disclosure, a vehicle is provided, comprising: a battery and the on-board charger according to the fourth aspect of the embodiments of the present disclosure, wherein the on-board charger is used to charge the battery.

[0052] According to the sixth aspect of the embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the bus voltage control method of the converter provided by the first aspect of the embodiment of the present disclosure are implemented.

[0053] Using the above technical solution, the duty cycle is determined based on the peak voltage of the AC signal and a preset voltage threshold, and a first drive signal is generated based on the duty cycle and a first reference carrier signal. Thus, when the first drive signal is used to control the operation of the high-frequency bridge arm, the bus voltage of the converter is less than or equal to the withstand voltage of the power devices included in the converter. In this way, the bus voltage of the converter can be controlled by software to be lower than the preset voltage threshold without affecting the service life and safety of the converter. Furthermore, because the bus voltage is lower than the preset voltage threshold, power devices with lower withstand voltages can be used, eliminating the need to select power devices with higher withstand voltages, thereby reducing the hardware cost of the converter.

[0054] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0056] Figure 1 Schematic diagram of a driving signal with a duty cycle of 0.5.

[0057] Figure 2 is a block diagram of a converter according to an exemplary embodiment.

[0058] Figure 3 The figure is a flow chart showing a bus voltage control method of a converter according to an exemplary embodiment.

[0059] Figure 4 is a circuit diagram of a converter according to an exemplary embodiment.

[0060] Figure 5 is a circuit diagram of another converter according to an exemplary embodiment.

[0061] Figure 6 The diagram is a schematic diagram showing a method of generating a first reference carrier signal according to an exemplary embodiment.

[0062] Figure 7 is a schematic diagram showing a method of generating a first driving signal according to an exemplary embodiment.

[0063] Figure 8A is a waveform diagram of a driving signal according to an exemplary embodiment.

[0064] Figure 8B is a waveform diagram of a bus voltage according to an exemplary embodiment.

[0065] Figure 8C FIG. 4 is a waveform diagram of a charging current for charging a battery according to an exemplary embodiment.

[0066] Figure 9 FIG. 1 is a diagram showing a voltage waveform and a current waveform of an alternating current signal according to an exemplary embodiment.

[0067] Figure 10 is a schematic diagram showing a method of generating a second driving signal according to an exemplary embodiment.

[0068] Figure 11 The figure is a block diagram of a bus voltage control device of a converter according to an exemplary embodiment.

[0069] Figure 12 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0070] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0071] It should be noted that all actions of acquiring signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0072] In the related art, to maximize the transmitted power, the power devices in the high-frequency bridge arm typically operate at a duty cycle of 0.5. Assuming the high-frequency bridge arm includes power devices S1, S2, S3, and S4, if power devices S1 and S4 form a pair of transistors, and power devices S2 and S3 form a pair of transistors, then power devices S1 and S4 are turned on and off simultaneously, and power devices S2 and S3 are turned on and off simultaneously. Furthermore, the drive signals used to drive power devices S1 and S4 are 180° out of phase with the drive signals used to drive power devices S2 and S3.

[0073] Figure 1 This is a schematic diagram of a driving signal with a duty cycle of 0.5. Figure 1 As shown, the solid line represents the driving signal for driving the power device S1 and the power device S4, and the dotted line represents the driving signal for driving the power device S2 and the power device S3. The conduction time of the power device S1, the power device S2, the power device S3 and the power device S4 is 0.5T. s , where T s Characterizes the period of the driving signal.

[0074] Referring to the topology of the converter in the related art, when the duty cycle of the driving signal for controlling the high-frequency bridge arm is 0.5, the bus voltage across the capacitor can be calculated, that is, the peak voltage across the filter capacitor Cc Among them, |V g This represents the absolute value of the AC peak voltage. Considering a ±20% fluctuation in grid voltage, the bus voltage peak can reach 746V, which can damage 650V power devices and affect the converter's lifespan and safety. To ensure circuit safety, power devices with higher withstand voltages are required, such as 1200V silicon carbide MOSFETs. This increases the converter's hardware cost.

[0075] In view of this, the present disclosure provides a bus voltage control method, device, related equipment and medium for a converter, which can control the bus voltage to be lower than a preset voltage threshold through software without affecting the service life and safety of the converter. In addition, since the bus voltage is lower than the preset voltage threshold, power devices with smaller withstand voltage values ​​can be used without selecting power devices with higher withstand voltage values, which can reduce the hardware cost of the converter.

[0076] First, the converter will be described.

[0077] Figure 2 FIG. 1 is a block diagram of a converter according to an exemplary embodiment. Figure 2 As shown, converter 1 is used to convert an input AC power signal into a DC power signal for charging battery 2. Converter 1 may include a high-frequency bridge arm 10, a power-frequency bridge arm 20, a filter capacitor 30, a transformer unit 40, and a rectifier circuit unit 50. For example, high-frequency bridge arm 10 may be a full-bridge circuit, and power-frequency bridge arm 20 may be a half-bridge circuit. High-frequency bridge arm 10 and power-frequency bridge arm 20 may form a power factor correction (PFC) circuit unit. For example, the high-frequency bridge arm and power-frequency bridge arm form a single-phase interleaved totem-pole PFC topology.

[0078] The filter capacitor 30 can be an electrolyte capacitor or a film capacitor. Among them, the electrolyte capacitor can ripple the voltage signal output by the high-frequency bridge arm and control the bus voltage. For example, the bus voltage is controlled to be less than 400V so that the bus voltage is less than the withstand voltage value of the power device. However, the electrolyte capacitor is large in size and occupies a large space. In the present disclosure, since the bus voltage can be controlled to be less than the voltage threshold by software, the bus voltage can be controlled without using an electrolyte capacitor, that is, the filter capacitor 30 can be a film capacitor Cp. Among them, the film capacitor is small in size, thereby effectively improving the power density.

[0079] In addition, if Figure 2 As shown, converter 1 is also connected to an AC power transmission port 3, which is connected to a high-frequency bridge arm 10 and a power-frequency bridge arm 20, respectively, for providing AC power signals to the high-frequency bridge arm 10 and the power-frequency bridge arm 20. The high-frequency bridge arm 10, the power-frequency bridge arm 20, and the filter capacitor 30 are connected in parallel. A transformer unit 40 is connected to the high-frequency bridge arm 10 and the rectifier circuit unit 50, respectively.

[0080] Figure 3 FIG. 1 is a flow chart showing a method for controlling the bus voltage of a converter according to an exemplary embodiment. Figure 3 As shown, the bus voltage control method may include the following steps.

[0081] In step S51 , a first reference carrier signal is determined.

[0082] In step S52 , the duty cycle of the driving signal for controlling the operation of the high-frequency bridge arm is determined according to the peak voltage of the alternating current signal and a preset voltage threshold.

[0083] In the present disclosure, the voltage threshold may be less than or equal to the withstand voltage of the power devices included in the converter. However, considering fluctuations and errors in grid voltage, to further extend the service life of the converter and ensure its electrical safety, the voltage threshold may be significantly lower than the withstand voltage of the power devices included in the converter. For example, if the withstand voltage of the power devices is 650V, the voltage threshold may be 400V.

[0084] Assuming that the duty cycle of the driving signal used to drive the high-frequency bridge arm is D, the bus peak voltage |V g | is the absolute value of the peak voltage of the AC power. Here, the duty cycle D ranges from [0,1]. According to the formula The value range of D can be further obtained, where Vo is the preset voltage threshold. Referring to the above content, when the duty cycle is 0.5, the bus voltage can reach a maximum of 746V, which will damage the power device with a withstand voltage of 650V. Therefore, when the withstand voltage of the power device is 650V, the value range of the duty cycle D obtained by referring to the above method is (0, 0.5). Figure 3 In the example, the duty cycle D can be any value in the range of (0, 0.5).

[0085] In the present disclosure, when the preset voltage threshold changes, the determined duty cycle will also change accordingly.

[0086] It should be understood that the present disclosure does not specifically limit the execution order of step S51 and step S52. Figure 3 As shown, step S51 is performed first and then step S52. Alternatively, step S52 may be performed first and then step S51. Alternatively, step S51 and step S52 may be performed simultaneously.

[0087] In step S53, a first drive signal for controlling the operation of the high-frequency bridge arm is generated according to the first reference carrier signal and the duty cycle, and the high-frequency bridge arm is controlled by the first drive signal so that the bus voltage is less than or equal to the voltage threshold.

[0088] In the present disclosure, since the duty cycle is determined according to a preset voltage threshold, and a first drive signal is generated according to the duty cycle to control the operation of the high-frequency bridge arm, when the operation of the high-frequency bridge arm is controlled according to the first drive signal, it can be ensured that the bus voltage of the converter is less than or equal to the voltage threshold, thereby realizing control of the bus voltage.

[0089] Using the above technical solution, the duty cycle is determined based on the peak voltage of the AC signal and a preset voltage threshold, and a first drive signal is generated based on the duty cycle and a first reference carrier signal. Thus, when the first drive signal is used to control the operation of the high-frequency bridge arm, the bus voltage of the converter is less than or equal to the withstand voltage of the power devices included in the converter. In this way, the bus voltage of the converter can be controlled by software to be lower than the preset voltage threshold without affecting the service life and safety of the converter. Furthermore, because the bus voltage is lower than the preset voltage threshold, power devices with lower withstand voltages can be used, eliminating the need to select power devices with higher withstand voltages, thereby reducing the hardware cost of the converter.

[0090] First, a specific implementation of determining the first reference carrier signal is described.

[0091] For converters with different topologies, the first reference carrier signal is determined in different ways.

[0092] In one embodiment, the converter has a dual active bridge (DAB) topology structure, that is, the transformer unit includes a phase-shifting inductor and a transformer. Figure 4 FIG. 1 is a circuit diagram of a converter according to an exemplary embodiment. Figure 4 In the figure, the transformer unit includes a phase-shifting inductor Lrp and a transformer T, wherein the phase-shifting inductor Lrp is connected to the high-frequency bridge arm 10 and one end of the primary side of the transformer T respectively, the other end of the primary side of the transformer T is connected to the high-frequency bridge arm 10, and the secondary side of the transformer T is connected to the rectifier circuit unit 50.

[0093] In this embodiment, a specific implementation of determining the first reference carrier signal is: determining the first reference carrier signal according to a preset pulse width modulation duty cycle and a count value.

[0094] The duty cycle and count value of the pulse width modulation can be pre-configured in an EPWM (Enhanced Pulse Width Moducation) register. Furthermore, determining the first reference carrier signal based on the duty cycle and count value of the pulse width modulation is a relatively mature technology and is not specifically limited in this disclosure.

[0095] In another embodiment, the converter structure is a resonant LLC topology structure, that is, the transformer unit includes a resonant inductor, a transformer primary resonant capacitor, a transformer secondary resonant capacitor, and a transformer. Figure 5 FIG. 1 is a circuit diagram of another converter according to an exemplary embodiment. Figure 5In the figure, the transformer unit includes a resonant inductor LS, a transformer primary resonant capacitor Cr, a transformer secondary resonant capacitor Cs, and a transformer T. One end of the resonant inductor LS is connected to the high-frequency bridge arm 10, and the other end is connected to the high-frequency bridge arm 10 via the primary side of the transformer T and the transformer primary resonant capacitor Cr. The secondary side of the transformer T is connected to the rectifier circuit unit 50 via the transformer secondary resonant capacitor Cs.

[0096] In this embodiment, the specific implementation method of determining the first reference carrier signal is: obtaining a first current value based on the current voltage value of the battery and the target voltage value of the battery; obtaining a frequency control parameter based on the first current value and the current value of the AC signal, and the frequency control parameter can indicate the frequency of the first reference carrier signal to be generated; generating the first reference carrier signal based on the frequency control parameter, and the frequency of the first reference carrier signal changes with the change of the current value of the AC signal.

[0097] Figure 6 FIG. 1 is a schematic diagram showing a method of generating a first reference carrier signal according to an exemplary embodiment. Figure 6 As shown, first, the current voltage value of the battery V bat and the target voltage value V bat * Input voltage control loop, get the first current value i output by voltage control loop gd * The target voltage value refers to the target value of battery charging, which can be obtained from the charging instruction. In addition, according to the AC signal i currently input to the AC transmission port g The current signal output after passing through the high-frequency bridge arm and the power frequency bridge arm and the AC signal i g , using the rotating coordinate transformation of the αβ AC current component to the dq DC component, the AC signal i is obtained g The corresponding current follows the value i gd After that, the first current value i gd * and current following value i gd The difference is input into the current control loop to obtain the frequency control parameter output by the current control loop. Finally, the frequency control parameter is input into the carrier generator, which generates and outputs a first reference carrier signal based on the frequency control parameter. The frequency of the first reference carrier signal corresponds to the frequency control parameter.

[0098] By adopting the above technical solution, the first reference carrier signal is obtained in different ways according to different topological structures of the converter, thereby improving the reliability of the determined first reference carrier signal.

[0099] After obtaining the first reference carrier signals of different converters in the above manner, the first drive signals can be generated for different converters in the following manner.

[0100] In one embodiment, step S52 generates a first drive signal for controlling the operation of the high-frequency bridge arm based on the first reference carrier signal and the duty cycle, which may include: generating a reference signal based on the duty cycle and the first reference carrier signal, wherein the amplitude of the reference signal does not change with time; and generating the first drive signal for controlling the operation of the high-frequency bridge arm based on the first reference carrier signal and the reference signal.

[0101] For example, the product of the duty cycle and the maximum amplitude of the first reference carrier signal can be used to determine the reference signal. The reference signal is a fixed value that does not change over time. For example, assuming the duty cycle is 0.4 and the maximum amplitude of the first reference carrier signal is 1, the reference signal is y = 0.4. If the maximum amplitude of the first reference carrier signal is 100, the reference signal is y = 40.

[0102] After the reference signal is determined, a first driving signal for controlling the operation of the high-frequency bridge arm is generated according to the first reference carrier signal and the reference signal.

[0103] For example, during the duration when the amplitude is less than the reference signal, the level of the first drive signal is set to a low level, and during the duration when the amplitude is greater than or equal to the reference signal, the level of the first drive signal is set to a high level. A high level can drive the power device to conduct, while a low level cannot drive the power device to conduct.

[0104] In one embodiment, the high-frequency bridge arm includes a first bridge arm and a second bridge arm; the first bridge arm includes a first power device and a second power device, the first power device is located at the upper bridge arm of the first bridge arm, and the second power device is located at the lower bridge arm of the first bridge arm; the second bridge arm includes a third power device and a fourth power device, the third power device is located at the upper bridge arm of the second bridge arm, and the fourth power device is located at the lower bridge arm of the second bridge arm.

[0105] like Figure 4 and Figure 5 As shown, the high-frequency bridge arm 10 includes a first bridge arm 101 and a second bridge arm 102 connected in parallel. The first bridge arm 101 includes a first power device S1 and a second power device S2 connected in series. The source of the first power device S1 is connected to the drain of the second power device S2, and the connection point between the first power device S1 and the second power device S2 is the midpoint a of the first bridge arm 101. The second bridge arm 102 includes a third power device S3 and a fourth power device S4 connected in series. The source of the third power device S3 is connected to the drain of the fourth power device S4, and the connection point between the third power device S3 and the fourth power device S4 is the midpoint b of the second bridge arm 102. Figure 4In the figure, one end of the phase-shifting inductor Lrp is connected to the midpoint a, and the other end of the primary side of the transformer T is connected to the midpoint b. Figure 5 In the figure, one end of the resonant inductor Ls is connected to the midpoint a, and the other end of the primary side of the transformer T is connected to the midpoint b via the primary side resonant capacitor Cr of the transformer.

[0106] In addition, Figure 4 and Figure 5 In the example, the AC power transmission port 3 may include an AC power source v g And boost inductor, wherein the boost inductor can be two independent inductors denoted as L1 and L2, wherein one end of L1 and L2 are connected to the AC power supply v g The positive terminal of L1 and L2 are connected to midpoints a and b, respectively. Furthermore, the boost inductor can be a coupled inductor, formed by two coils wound around a magnet in opposite directions. This reduces the space occupied by the boost inductor.

[0107] Correspondingly, the above-mentioned generation of the first drive signal for controlling the operation of the high-frequency bridge arm based on the first reference carrier signal and the reference signal can be: inputting the first reference carrier signal into the negative input terminal of the first comparator, inputting the reference signal into the positive input terminal of the first comparator, and obtaining a first sub-drive signal output by the first comparator for driving the first power device and the fourth power device; inputting the first sub-drive signal into the first inverter, and obtaining a second sub-drive signal output by the first inverter for driving the second power device and the third power device.

[0108] In the present disclosure, the first driving signal includes a first sub-driving signal and a second sub-driving signal, wherein the first sub-driving signal is used to drive the first power device S1 and the fourth power device S4, and the second sub-driving signal is used to drive the second power device S2 and the third power device S3. Figure 7 FIG. 1 is a schematic diagram showing a method of generating a first driving signal according to an exemplary embodiment. Figure 7 As shown, assuming that the duty cycle of the drive signals for the first power device S1 to the fourth power device S4 is D, and the reference signal is b, where the reference signal b is the product of the duty cycle D and the maximum amplitude of the first reference carrier signal. The first reference carrier signal is input into the negative input terminal of the first comparator A1, and the reference signal b is input into the positive input terminal of the first comparator A1 to obtain a first sub-drive signal for driving the first power device S1 and the fourth power device S4. Subsequently, the output terminal of the first comparator A1 is connected to the first inverter F1. That is, the first sub-drive signal is input into the first inverter F1 to obtain a second sub-drive signal, which is used to drive the second power device S2 and the third power device S3.

[0109] For example, the first drive signal drives the first power device S1 to the fourth power device S4 to be turned on or off, thereby controlling the high-frequency bridge arm to operate in the following two modes: Mode 1: when the first power device S1 and the fourth power device S4 are in the on state, the second power device S2 and the third power device S3 are in the off state; Mode 2: when the second power device S2 and the third power device S3 are in the on state, the first power device S1 and the fourth power device S4 are in the off state.

[0110] The duty cycle of the driving signal of the first power device S1 to the fourth power device S4 is D. At the same time, only one of the two power devices in the same bridge arm is in the on state. Mode 1 and Mode 2 are executed once in each PWM signal cycle, and the duration is D*T respectively. s .

[0111] In this manner, the first and second sub-drive signals are obtained, and the first sub-drive signal is used to drive the first and fourth power devices, while the second sub-drive signal is used to control the second and third power devices, so that the bus voltage is less than or equal to the voltage threshold. This eliminates the need to select power devices with higher withstand voltages, reducing the hardware cost of the converter without compromising its service life or safety.

[0112] Figure 8A FIG. 1 is a waveform diagram of a driving signal according to an exemplary embodiment. Figure 8A As shown, assuming the duty cycle D is 0.3, T s The solid line represents the waveform of the first sub-drive signal for controlling the first power device S1 and the fourth control device S4, and the dotted line represents the waveform of the second sub-drive signal for controlling the second power device S2 and the third control device S3. As shown in the figure, in a period T s The duration of the high level of the first sub-driving signal and the second sub-driving signal is 0.3T. s .

[0113] Figure 8B FIG. 1 is a waveform diagram of a bus voltage according to an exemplary embodiment. Figure 8B As shown, the solid line represents the waveform of the bus voltage when the duty cycle D is 0.5, and the dotted line represents the waveform of the bus voltage when the duty cycle D is 0.3. It can be seen that when the duty cycle D is 0.3, the maximum amplitude of the bus voltage is 1.4 times the absolute value of the AC peak voltage, that is, 1.4|V g |, when the duty cycle D is 0.5, the maximum amplitude of the bus voltage is twice the absolute value of the AC peak voltage, that is, 2|V gIn addition, the frequency of the bus voltage is twice the frequency of the AC signal, that is, the bus voltage period T2 is 0.5 times the period T1 of the AC signal.

[0114] In this way, by adopting the above technical solution and reducing the duty cycle, the bus voltage can be effectively reduced, power devices with low withstand voltage values ​​can be selected, and hardware costs can be reduced.

[0115] Figure 8C FIG. 1 is a waveform diagram of a charging current for charging a battery according to an exemplary embodiment. Figure 8C In the embodiment, the period T3 of the charging current for charging the battery is also 0.5 times the period T1 of the AC signal.

[0116] In one embodiment, the operation of the power frequency bridge arm in the converter can also be controlled. For example, the operation of the power frequency bridge arm can be controlled according to the AC signal. The cycle of the AC signal includes a positive half cycle and a negative half cycle; the power frequency bridge arm includes a fifth power device and a sixth power device, the fifth power device is located in the upper bridge arm of the power frequency bridge arm, and the sixth power device is located in the lower bridge arm of the power frequency bridge arm. Figure 4 and Figure 5 As shown, the power frequency bridge arm 20 includes a fifth power device S5 and a sixth power device S6 connected in series, wherein the source of the fifth power device S5 is connected to the drain of the sixth power device S6, and the connection point between the fifth power device S5 and the sixth power device S6 serves as the midpoint e of the power frequency bridge arm 20.

[0117] In addition, Figure 4 and Figure 5 In the middle, AC power supply v g The negative terminal of is connected to the midpoint e of the power frequency bridge arm 20. The first bridge arm, the second bridge arm, and the power frequency bridge arm form a single-phase interleaved totem pole PFC topology, which can improve conversion efficiency, reduce current ripple of the input AC power, and improve the quality of the input AC power.

[0118] In this embodiment, controlling the operation of the industrial frequency bridge arm according to the AC signal may include: controlling the sixth power device S6 to be turned on and the fifth power device S5 to be turned off during the positive half cycle of the AC signal; and controlling the sixth power device S6 to be turned off and the fifth power device S5 to be turned on during the negative half cycle of the AC signal.

[0119] It should be understood that for Figure 4 and Figure 5 The converters shown can all control the operation of the high-frequency bridge arm and the industrial frequency bridge arm in the above manner.

[0120] The control method of the rectifier circuit unit is described below.

[0121] In one embodiment, the transformer unit includes a phase-shifting inductor and a transformer, that is, Figure 4 The converter shown. The bus voltage control method of the converter may also include:

[0122] Acquiring electrical parameters of the converter, the electrical parameters including a current voltage value of the battery, a target voltage value of the battery, a phase angle of the AC signal, and a current value of the AC signal input to the converter;

[0123] generating a second reference carrier signal according to the electrical parameter and the first reference carrier signal, wherein the second reference carrier signal is phase delayed with respect to the first reference carrier signal;

[0124] Generate a modulation signal based on the phase angle of the AC signal and a preset coefficient. The preset coefficient ranges from [0, 0.5].

[0125] A second driving signal for controlling the operation of the rectifier circuit unit is generated according to the second reference carrier signal and the modulation signal.

[0126] The target battery voltage refers to the target battery charging value, which can be obtained from the charging instruction. The phase angle of the AC signal refers to the phase angle of the AC power grid. The current value of the AC signal input to the converter can be detected in real time by a current detection device.

[0127] The specific implementation method of generating the second reference carrier signal based on the electrical parameters and the first reference carrier signal can be: determining the target current value of the power factor correction circuit based on the current voltage value of the battery, the target voltage value of the battery and the sine value of the phase angle of the AC signal, the power factor correction circuit includes a high-frequency bridge arm and an industrial frequency bridge arm; determining the phase shift of the reference carrier signal based on the target current value and the current value of the AC signal; generating the second reference carrier signal based on the phase shift phase of the reference carrier signal and the first reference carrier signal.

[0128] Among them, the specific method of generating the phase shift phase is the same as Figure 6 The method of generating the frequency control parameter is similar to that shown in FIG. For example, first, the current voltage value V bat and the target voltage value V bat * Input the voltage control loop to obtain the variable output by the voltage control loop, and multiply the variable by the sine value sinθ of the phase angle of the AC signal to obtain the target current value i of the power factor correction circuit. g * Next, the target current value i g * and the current value i of the detected AC signal gThe difference between the two is input into the current control loop to obtain the phase shift output by the current control loop. Finally, the phase shift of the reference carrier signal and the first reference carrier signal are input into a carrier generator to generate a second reference carrier signal. For example, the second reference carrier signal is obtained by shifting the first reference carrier signal by the phase shift phase. In this way, the phase delay between the second reference carrier signal and the first reference carrier signal is equal to the phase shift phase determined above. For example, if the phase shift phase is a, the second reference carrier signal is obtained by shifting the phase of the first reference carrier signal by a.

[0129] It should be understood that the parameters in the voltage control loop, current control loop and carrier generator used in generating the phase shift are different from those in the Figure 6 The parameters in the voltage control loop, current control loop, and carrier generator used in the process of generating the frequency control parameters shown may be different.

[0130] Figure 9 The voltage waveform and current waveform of an AC signal are shown according to an exemplary embodiment. The target current value i of the power factor correction circuit is obtained by multiplying the variable output by the voltage control loop with the sine value of the phase angle of the AC signal. g * , there is no phase difference between the AC current signal and the AC voltage signal. Figure 9 As shown, the phases of the voltage waveform and the current waveform of the AC signal are the same, that is, the power factor correction coefficient PF=1.

[0131] Furthermore, a modulation signal can be generated based on the phase angle of the AC signal and a preset coefficient. For example, the product of the preset coefficient and the absolute value of the sine value of the AC signal's phase angle is used to determine the modulation signal d. That is, d = k*|sinθ|. Here, k represents the preset coefficient. The preset coefficient can be the same as or different from the duty cycle, and this disclosure does not impose any specific limitations on this.

[0132] After the second reference carrier signal and the modulation signal are obtained in the above manner, a second driving signal for controlling the operation of the rectifier circuit unit is generated according to the second reference carrier signal and the modulation signal.

[0133] The specific implementation of generating the second driving signal is described below.

[0134] First, the specific structure of the rectifier circuit unit 50 is described. Figure 4 and Figure 5As shown, the rectifier circuit unit 50 may include a third bridge arm 501 and a fourth bridge arm 502. The third bridge arm 501 includes a seventh power device S7 and an eighth power device S8, wherein the seventh power device S7 is located at the upper bridge arm of the third bridge arm 501, and the eighth power device S8 is located at the lower bridge arm of the third bridge arm 501. The fourth bridge arm 502 includes a ninth power device S9 and a tenth power device S10, wherein the ninth power device S9 is located at the upper bridge arm of the fourth bridge arm 502, and the tenth power device S10 is located at the lower bridge arm of the fourth bridge arm 502.

[0135] In addition, Figure 4 and Figure 5 In the embodiment, the source of the seventh power device S7 is connected to the drain of the eighth power device S8, and the connection point between the two is the midpoint c of the third bridge arm 501. The source of the ninth power device S9 is connected to the drain of the tenth power device S10, and the connection point between the two is the midpoint d of the fourth bridge arm 502. The two ends of the secondary side of the transformer T are respectively connected to the midpoint c of the third bridge arm 501 and the midpoint d of the fourth bridge arm 502.

[0136] Accordingly, for Figure 4 The converter shown generates a second driving signal for controlling the operation of the rectifier circuit unit according to the second reference carrier signal and the modulation signal, which may include:

[0137] Inputting the second reference carrier signal into the negative input terminal of the second comparator and inputting the modulated signal into the positive input terminal of the second comparator to obtain a third sub-driving signal output by the second comparator for driving the seventh power device;

[0138] inputting the third sub-driving signal into the second inverter to obtain a fourth sub-driving signal output by the second inverter for driving the eighth power device;

[0139] Input the modulated signal to the positive input terminal of the third comparator, shift the second reference carrier signal by 180 degrees and input it to the negative input terminal of the third comparator, to obtain a fifth sub-driving signal output by the third comparator for driving the ninth power device;

[0140] The fifth sub-driving signal is input into the third inverter to obtain a sixth sub-driving signal output by the third inverter and used for driving the tenth power device.

[0141] For example, Figure 10 FIG. 1 is a schematic diagram showing a method for generating a second driving signal according to an exemplary embodiment. The second driving signal includes a third sub-driving signal, a fourth sub-driving signal, a fifth sub-driving signal and a sixth sub-driving signal. Figure 10As shown, the second reference carrier signal is input to the negative input of the second comparator A2, and the modulation signal d is input to the positive input of the second comparator A2, resulting in a third sub-drive signal output by the second comparator A2 for driving the seventh power device S7. The output of the second comparator A2 is connected to the second inverter F2, that is, the third sub-drive signal is input to the second inverter F2, resulting in a fourth sub-drive signal output by the second inverter F2 for driving the eighth power device S8. The modulation signal d is input to the positive input of the third comparator A3, and the second reference carrier signal is phase-shifted by 180° and input to the negative input of the third comparator A3, resulting in a fifth sub-drive signal output by the third comparator A3 for driving the ninth power device S9. The output of the third comparator A3 is connected to the third inverter F3, that is, the fifth sub-drive signal is input to the third inverter F3, resulting in a sixth sub-drive signal output by the third inverter F3 for driving the tenth power device S10.

[0142] In another embodiment, the transformer unit includes a resonant inductor, a transformer primary resonant capacitor, a transformer secondary resonant capacitor and a transformer, that is, Figure 5 The converter shown. The bus voltage control method of the converter may also include:

[0143] A third driving signal for controlling the operation of the rectifier circuit unit is generated according to the phase angle of the AC signal and the first driving signal.

[0144] It should be understood that for Figure 5 The converter shown needs to be Figure 6 The first reference carrier signal is generated in the manner shown, and then, according to the first reference carrier signal, reference is made to Figure 7 The first driving signal is generated in the manner shown, and finally, a third driving signal for controlling the operation of the rectifier circuit unit is generated according to the phase angle of the AC signal and the first driving signal.

[0145] For example, the first drive signal includes a first sub-drive signal for driving the first power device S1 and the fourth power device S4, and a second sub-drive signal for driving the second power device S2 and the third power device S3. Correspondingly, the third drive signal may include a seventh sub-drive signal for driving the seventh power device S7 and the tenth power device S10, and an eighth sub-drive signal for driving the eighth power device S8 and the ninth power device S9.

[0146] The seventh sub-drive signal can be generated based on the phase angle of the AC signal and the first sub-drive signal, and the eighth sub-drive signal can be generated based on the phase angle of the AC signal and the second sub-drive signal. For example, the correspondence between the phase angle of the AC signal and the offset phase can be pre-calibrated based on experiments. Thus, the offset phase corresponding to the phase angle of the AC signal can be determined based on this correspondence. Subsequently, the first sub-drive signal is phase-shifted by the offset phase to obtain the seventh sub-drive signal. Similarly, the second sub-drive signal is phase-shifted by the offset phase to obtain the eighth sub-drive signal.

[0147] Thus, according to the above method, a driving signal for driving each power device can be obtained, and then the power devices are controlled to be turned on or off according to the respective driving signals, so that the converter converts the AC signal into a DC signal.

[0148] Based on the same inventive concept, the present disclosure also provides a bus voltage control device for a converter. Figure 11 This is a block diagram of a bus voltage control device for a converter according to an exemplary embodiment. The converter is used to convert an input AC signal into a DC signal to charge a battery. The converter includes a high-frequency bridge arm, an industrial frequency bridge arm, a filter capacitor, a transformer unit, and a rectifier circuit unit. Figure 11 The bus voltage control device 1300 of the converter may include:

[0149] A first determining module 1301 is configured to determine a first reference carrier signal;

[0150] a second determining module 1302 configured to determine a duty cycle of a driving signal for controlling the operation of the high-frequency bridge arm based on a peak voltage of the AC signal and a preset voltage threshold, wherein the voltage threshold is less than or equal to a withstand voltage value of a power device included in the converter;

[0151] The first generating module 1303 is configured to generate a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the duty cycle, and use the first driving signal to control the operation of the high-frequency bridge arm so that the bus voltage is less than or equal to the voltage threshold.

[0152] Optionally, the first generating module 1303 includes:

[0153] a first generating submodule, configured to generate a reference signal according to the duty cycle and the first reference carrier signal, wherein the amplitude of the reference signal does not change with time;

[0154] The second generating submodule is configured to generate a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the reference signal.

[0155] Optionally, the high-frequency bridge arm includes a first bridge arm and a second bridge arm; the first bridge arm includes a first power device and a second power device, the first power device is located in the upper bridge arm of the first bridge arm, and the second power device is located in the lower bridge arm of the first bridge arm; the second bridge arm includes a third power device and a fourth power device, the third power device is located in the upper bridge arm of the second bridge arm, and the fourth power device is located in the lower bridge arm of the second bridge arm;

[0156] The second generation submodule is configured as follows:

[0157] Inputting the first reference carrier signal into a negative input terminal of a first comparator and inputting the reference signal into a positive input terminal of the first comparator to obtain a first sub-driving signal output by the first comparator for driving the first power device and the fourth power device;

[0158] The first sub-driving signal is input into a first inverter to obtain a second sub-driving signal output by the first inverter for driving the second power device and the third power device.

[0159] Optionally, the cycle of the AC power signal includes a positive half-cycle and a negative half-cycle; the power frequency bridge arm includes a fifth power device and a sixth power device, the fifth power device is located in the upper bridge arm of the power frequency bridge arm, and the sixth power device is located in the lower bridge arm of the power frequency bridge arm; the bus voltage control device 1300 of the converter may further include:

[0160] a first control module, configured to control the sixth power device to be turned on and the fifth power device to be turned off during the positive half cycle;

[0161] The second control module is configured to control the sixth power device to be turned off and the fifth power device to be turned on during the negative half cycle.

[0162] Optionally, when the transformer unit includes a phase-shift inductor and a transformer, the first determining module 1301 is configured to determine the first reference carrier signal according to a preset pulse width modulation duty cycle and a count value.

[0163] Optionally, the bus voltage control device 1300 of the converter may further include:

[0164] an acquisition module configured to acquire electrical parameters of the converter, the electrical parameters including a current voltage value of the battery, a target voltage value of the battery, a phase angle of the AC signal, and a current value of the AC signal input to the converter;

[0165] a second generating module configured to generate a second reference carrier signal according to the electrical parameter and the first reference carrier signal, wherein the second reference carrier signal is phase delayed with respect to the first reference carrier signal;

[0166] a third generating module configured to generate a modulation signal according to the phase angle of the alternating current signal and a preset coefficient, wherein the preset coefficient has a value range of [0, 0.5];

[0167] The fourth generating module is configured to generate a second driving signal for controlling the operation of the rectifier circuit unit according to the second reference carrier signal and the modulation signal.

[0168] Optionally, the rectifier circuit unit includes a third bridge arm and a fourth bridge arm, the third bridge arm includes a seventh power device and an eighth power device, the seventh power device is located in an upper bridge arm of the third bridge arm, and the eighth power device is located in a lower bridge arm of the third bridge arm, the fourth bridge arm includes a ninth power device and a tenth power device, the ninth power device is located in an upper bridge arm of the fourth bridge arm, and the tenth power device is located in a lower bridge arm of the fourth bridge arm; the fourth generation module is configured to:

[0169] Inputting the second reference carrier signal into the negative input terminal of the second comparator and inputting the modulated signal into the positive input terminal of the second comparator to obtain a third sub-driving signal output by the second comparator for driving the seventh power device;

[0170] inputting the third sub-driving signal into the second inverter to obtain a fourth sub-driving signal output by the second inverter for driving the eighth power device;

[0171] Input the modulated signal to the positive input terminal of the third comparator, shift the second reference carrier signal by 180 degrees and input it to the negative input terminal of the third comparator, to obtain a fifth sub-driving signal output by the third comparator for driving the ninth power device;

[0172] The fifth sub-driving signal is input into the third inverter to obtain a sixth sub-driving signal output by the third inverter and used for driving the tenth power device.

[0173] Optionally, the second generating module is configured to:

[0174] determining a target current value of a power factor correction circuit according to a current voltage value of the battery, a target voltage value of the battery, and a sine value of a phase angle of the alternating current signal, wherein the power factor correction circuit includes the high-frequency bridge arm and the power-frequency bridge arm;

[0175] determining a phase shift of a reference carrier signal according to the target current value and the current value of the AC signal;

[0176] A second reference carrier signal is generated according to the shifted phase of the reference carrier signal and the first reference carrier signal.

[0177] Optionally, when the transformer unit includes a resonant inductor, a transformer primary resonant capacitor, a transformer secondary resonant capacitor, and a transformer, the first determining module 1301 is configured to:

[0178] Obtaining a first current value according to a current voltage value of the battery and a target voltage value of the battery;

[0179] Obtaining a frequency control parameter according to the first current value and the current value of the alternating current signal, wherein the frequency control parameter can indicate the frequency of a first reference carrier signal to be generated;

[0180] The first reference carrier signal is generated according to the frequency control parameter, and the frequency of the first reference carrier signal changes with the current value of the alternating current signal.

[0181] Optionally, the bus voltage control device 1300 of the converter may further include:

[0182] The fifth generating module is configured to generate a third driving signal for controlling the operation of the rectifier circuit unit according to the phase angle of the alternating current signal and the first driving signal.

[0183] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0184] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon. When the program instructions are executed by a processor, the steps of the bus voltage control method of the converter provided by the present disclosure are implemented.

[0185] The present disclosure also provides a control device, comprising: a processor;

[0186] a memory for storing processor-executable instructions;

[0187] The processor is configured to execute the instructions to implement the steps of the bus voltage control method of the converter provided by the present disclosure.

[0188] For example, the control device may be a controller.

[0189] The present disclosure also provides an on-vehicle charger, comprising: a converter and the control device provided by the present disclosure.

[0190] The present disclosure also provides a vehicle, comprising an on-board charger and a battery, wherein the on-board charger is used to charge the battery.

[0191] For example, Figure 12 6 is a block diagram illustrating a vehicle according to an exemplary embodiment. For example, vehicle 600 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or another type of vehicle. Vehicle 600 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0192] Reference Figure 12 Vehicle 600 may include various subsystems, such as an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. Vehicle 600 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of vehicle 600 may be interconnected via wired or wireless means.

[0193] In some embodiments, the infotainment system 610 may include a communication system, an entertainment system, a navigation system, and the like.

[0194] The perception system 620 may include several sensors for sensing information about the environment surrounding the vehicle 600. For example, the perception system 620 may include a global positioning system (which may be a GPS system, a BeiDou system, or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter-wave radar, an ultrasonic radar, and a camera.

[0195] The decision control system 630 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0196] The drive system 640 may include components that provide power to the vehicle 600. In one embodiment, the drive system 640 may include an engine, an energy source, a transmission system, and wheels. The engine may be an internal combustion engine, an electric motor, an air compression engine, or a combination thereof. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0197] Some or all functions of the vehicle 600 are controlled by a computing platform 650. The computing platform 650 may include at least one processor 651 and a memory 652. The processor 651 may execute instructions 653 stored in the memory 652.

[0198] The processor 651 can be any conventional processor, such as a commercially available CPU. The processor can also include a graphics processor (GPU), a field programmable gate array (FPGA), a system on chip (SOC), an application specific integrated circuit (ASIC), or a combination thereof.

[0199] The memory 652 may be implemented by any type of volatile or non-volatile memory device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0200] In addition to instructions 653 , memory 652 may also store data, such as road maps, route information, and vehicle location, direction, speed, etc. The data stored in memory 652 may be used by computing platform 650 .

[0201] In the embodiment of the present disclosure, the processor 651 may execute the instruction 653 to complete all or part of the steps of the above-mentioned bus voltage control method of the converter.

[0202] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device, and has a code portion for executing the bus voltage control method of the converter when executed by the programmable device.

[0203] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0204] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A bus voltage control method for a converter, characterized in that: The converter is used to convert an input AC signal into a DC signal to charge the battery. The converter includes a high-frequency bridge arm, an industrial frequency bridge arm, a filter capacitor, a transformer unit, and a rectifier circuit unit. The method includes: determining a first reference carrier signal; Determining a duty cycle of a drive signal for controlling the operation of the high-frequency bridge arm based on a peak voltage of the alternating current signal and a preset voltage threshold, wherein the voltage threshold is less than or equal to a withstand voltage of a power device included in the converter; A first drive signal for controlling the operation of the high-frequency bridge arm is generated according to the first reference carrier signal and the duty cycle, and the operation of the high-frequency bridge arm is controlled by using the first drive signal so that the bus voltage is less than or equal to the voltage threshold.

2. The method according to claim 1, characterized in that Generating a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the duty cycle includes: generating a reference signal according to the duty cycle and the first reference carrier signal, wherein the amplitude of the reference signal does not change with time; A first driving signal for controlling the operation of the high-frequency bridge arm is generated according to the first reference carrier signal and the reference signal.

3. The method according to claim 2, characterized in that The high-frequency bridge arm includes a first bridge arm and a second bridge arm; the first bridge arm includes a first power device and a second power device, the first power device is located in the upper bridge arm of the first bridge arm, and the second power device is located in the lower bridge arm of the first bridge arm; the second bridge arm includes a third power device and a fourth power device, the third power device is located in the upper bridge arm of the second bridge arm, and the fourth power device is located in the lower bridge arm of the second bridge arm; Generating a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the reference signal includes: Inputting the first reference carrier signal into a negative input terminal of a first comparator and inputting the reference signal into a positive input terminal of the first comparator to obtain a first sub-driving signal output by the first comparator for driving the first power device and the fourth power device; The first sub-driving signal is input into a first inverter to obtain a second sub-driving signal output by the first inverter for driving the second power device and the third power device.

4. The method according to claim 1, wherein The cycle of the AC signal includes a positive half-cycle and a negative half-cycle; the power frequency bridge arm includes a fifth power device and a sixth power device, the fifth power device is located in an upper bridge arm of the power frequency bridge arm, and the sixth power device is located in a lower bridge arm of the power frequency bridge arm; the method further includes: In the positive half cycle, controlling the sixth power device to be turned on and the fifth power device to be turned off; In the negative half cycle, the sixth power device is controlled to be turned off and the fifth power device is controlled to be turned on.

5. The method according to any one of claims 1 to 4, characterized in that When the transformer unit includes a phase-shifting inductor and a transformer, determining the first reference carrier signal includes: A first reference carrier signal is determined according to a preset pulse width modulation duty cycle and a count value.

6. The method according to claim 5, characterized in that The method further comprises: Acquiring electrical parameters of the converter, the electrical parameters including a current voltage value of the battery, a target voltage value of the battery, a phase angle of the AC signal, and a current value of the AC signal input to the converter; generating a second reference carrier signal according to the electrical parameter and the first reference carrier signal, wherein the second reference carrier signal is phase delayed with respect to the first reference carrier signal; Generate a modulation signal according to the phase angle of the AC signal and a preset coefficient, where the preset coefficient has a value range of [0, 0.5]; A second driving signal for controlling the operation of the rectifier circuit unit is generated according to the second reference carrier signal and the modulation signal.

7. The method according to claim 6, characterized in that The rectifier circuit unit includes a third bridge arm and a fourth bridge arm, the third bridge arm includes a seventh power device and an eighth power device, the seventh power device is located in the upper bridge arm of the third bridge arm, and the eighth power device is located in the lower bridge arm of the third bridge arm, the fourth bridge arm includes a ninth power device and a tenth power device, the ninth power device is located in the upper bridge arm of the fourth bridge arm, and the tenth power device is located in the lower bridge arm of the fourth bridge arm; Generating a second drive signal for controlling the operation of the rectifier circuit unit according to the second reference carrier signal and the modulation signal includes: Inputting the second reference carrier signal into the negative input terminal of the second comparator and inputting the modulated signal into the positive input terminal of the second comparator to obtain a third sub-driving signal output by the second comparator for driving the seventh power device; inputting the third sub-driving signal into the second inverter to obtain a fourth sub-driving signal output by the second inverter for driving the eighth power device; Input the modulated signal to the positive input terminal of the third comparator, shift the second reference carrier signal by 180 degrees and input it to the negative input terminal of the third comparator, to obtain a fifth sub-driving signal output by the third comparator for driving the ninth power device; The fifth sub-driving signal is input into the third inverter to obtain a sixth sub-driving signal output by the third inverter and used for driving the tenth power device.

8. The method according to claim 6, characterized in that Generating a second reference carrier signal according to the electrical parameter and the first reference carrier signal includes: determining a target current value of a power factor correction circuit according to a current voltage value of the battery, a target voltage value of the battery, and a sine value of a phase angle of the alternating current signal, wherein the power factor correction circuit includes the high-frequency bridge arm and the power-frequency bridge arm; determining a phase shift of a reference carrier signal according to the target current value and the current value of the AC signal; A second reference carrier signal is generated according to the shifted phase of the reference carrier signal and the first reference carrier signal.

9. The method according to any one of claims 1 to 4, characterized in that When the transformer unit includes a resonant inductor, a transformer primary resonant capacitor, a transformer secondary resonant capacitor, and a transformer, determining the first reference carrier signal includes: Obtaining a first current value according to a current voltage value of the battery and a target voltage value of the battery; Obtaining a frequency control parameter according to the first current value and the current value of the alternating current signal, wherein the frequency control parameter can indicate the frequency of a first reference carrier signal to be generated; The first reference carrier signal is generated according to the frequency control parameter, and the frequency of the first reference carrier signal changes with the current value of the alternating current signal.

10. The method according to claim 9, characterized in that The method further comprises: A third driving signal for controlling the operation of the rectifier circuit unit is generated according to the phase angle of the AC signal and the first driving signal.

11. A bus voltage control device for a converter, characterized in that: The converter is used to convert an input AC signal into a DC signal to charge the battery. The converter includes a high-frequency bridge arm, an industrial frequency bridge arm, a filter capacitor, a transformer unit, and a rectifier circuit unit. The device includes: A first determining module is configured to determine a first reference carrier signal; a second determining module configured to determine a duty cycle of a driving signal for controlling the operation of the high-frequency bridge arm based on a peak voltage of the alternating current signal and a preset voltage threshold, wherein the voltage threshold is less than or equal to a withstand voltage value of a power device included in the converter; The first generating module is configured to generate a first driving signal for controlling the operation of the high-frequency bridge arm according to the first reference carrier signal and the duty cycle, and use the first driving signal to control the operation of the high-frequency bridge arm so that the bus voltage is less than or equal to the voltage threshold.

12. A control device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to execute the instructions to implement the steps of the bus voltage control method of the converter according to any one of claims 1 to 10.

13. A vehicle-mounted charger, characterized in that: include: A converter and a control device as claimed in claim 11.

14. A vehicle, characterized in that: include: A battery and the on-board charger as claimed in claim 13, wherein the on-board charger is used to charge the battery.

15. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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