Modulation method, device and equipment of dual active converter and storage medium

Abstract

The application belongs to the field of dual active converters, and discloses a modulation method, device and equipment of a dual active converter and a storage medium. The application collects the output voltage of the dual active converter, then determines the phase control quantity of the dual active converter according to the output voltage, and controls the switching time sequence of the dual active converter according to the phase control quantity to modulate the dual active converter. The application controls the switching time sequence of the dual active converter according to the phase control quantity. Compared with the existing transformer, all switching tubes of the primary and secondary sides are turned on with a 50% duty ratio. The above-mentioned method of the application can change the phase control quantity with the change of the output voltage of the dual active converter, and control the switching time sequence of the dual active converter according to the phase control quantity, thereby effectively improving the switching characteristics of the switching tube, effectively modulating the switching characteristics of the switching tube in the dual active converter, and making the converter have a wider soft switching working area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, and particularly relates to a modulation method, device and equipment of a dual active bridge converter and a storage medium. BACKGROUND

[0002] In a dual active bridge converter of an existing electric vehicle on-board charger, when the output voltage has a wide variation range, a traditional modulation method is that all the switching tubes of the primary side and the secondary side of the transformer are turned on with a duty cycle of 50% (without considering the dead time), and by adjusting the phase shift between the four switching tubes of the primary side of the transformer and the four switching tubes of the secondary side of the transformer, different transmission powers of the dual active bridge converter can be achieved. When the output voltage has a wide variation range, this modulation method will make the dual active bridge converter work in a hard switching condition, which affects the conversion efficiency. Therefore, how to effectively modulate the switching characteristics of the switching tubes in the dual active bridge converter to improve the transmission efficiency of the dual active bridge converter has become a problem to be solved.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The main purpose of the present application is to provide a modulation method, device and equipment of a dual active bridge converter and a storage medium, which aims to solve the technical problem of how to effectively modulate the switching characteristics of the switching tubes in the dual active bridge converter to improve the transmission efficiency of the dual active bridge converter.

[0005] To achieve the above purpose, the present application provides a modulation method of a dual active bridge converter, which comprises the following steps:

[0006] Collecting an output voltage of the dual active bridge converter;

[0007] Determining a phase control amount of the dual active bridge converter according to the output voltage;

[0008] Controlling the switching time sequence of the dual active bridge converter according to the phase control amount to modulate the dual active bridge converter.

[0009] Optionally, the step of determining the phase control amount of the dual active bridge converter according to the output voltage specifically comprises:

[0010] Inputting the output voltage and a reference voltage into an error amplifier to make the error amplifier determine an error signal according to the output voltage and the reference voltage when the output voltage is greater than the reference voltage;

[0011] inputting the error signal into a proportional integrator, so that the proportional integrator determines a phase control quantity of the dual active bridge converter according to the error signal.

[0012] Optionally, the dual active bridge converter comprises: first to eighth switches, a first DC filter capacitor, a second DC filter capacitor, a first DC blocking capacitor, a second DC blocking capacitor, a first inductor, and a first transformer.

[0013] The positive pole of the first DC filter capacitor, the drain of the first switch, and the drain of the third switch are connected to the positive pole of an input power supply; the negative pole of the first DC filter capacitor, the source of the second switch, and the source of the fourth switch are connected to the negative pole of the input power supply; the source of the third switch and the drain of the fourth switch are connected; the positive pole of the first DC blocking capacitor is connected to the source of the first switch and the drain of the second switch respectively; the negative pole of the first DC blocking capacitor is connected to the first end of the first inductor; the second end of the first inductor and the drain of the fourth switch are connected to the primary coil of the first transformer; the secondary coil of the first transformer is connected to the positive pole of the second DC blocking capacitor, the source of the seventh switch, and the drain of the eighth switch; the drain of the fifth switch, the drain of the seventh switch, and the positive pole of the second DC filter capacitor are connected to the positive pole of an output power supply; the source of the fifth switch is connected to the negative pole of the second DC blocking capacitor and the drain of the sixth switch respectively; the source of the sixth switch, the source of the eighth switch, and the negative pole of the second DC filter capacitor are connected to the negative pole of the output power supply.

[0014] Optionally, the step of controlling the switching sequence of the dual active bridge converter according to the phase control quantity to modulate the dual active bridge converter specifically comprises:

[0015] controlling the turning on and turning off of the first to eighth switches according to the phase control quantity to modulate the dual active bridge converter.

[0016] Optionally, the step of controlling the turning on and turning off of the first to eighth switches according to the phase control quantity to modulate the dual active bridge converter specifically comprises:

[0017] determining a preset time length according to the phase control quantity;

[0018] after the sixth switch is turned off for the preset time length, the seventh switch is turned off, and the fifth switch and the eighth switch are turned on;

[0019] after the eighth switch is turned off for the preset time length, the sixth switch and the seventh switch are turned on, and the fifth switch is turned off;

[0020] The fifth switch is turned off after the preset time length, the sixth switch and the seventh switch are turned on, and the eighth switch is turned off.

[0021] The fifth switch is turned off after the preset time length, the sixth switch and the seventh switch are turned on, and the eighth switch is turned off.

[0022] Optionally, the dual active bridge converter comprises a ninth switch to a fourteenth switch, a third DC filter capacitor, a fourth DC filter capacitor, a third DC blocking capacitor, a fourth DC blocking capacitor, a fifth DC blocking capacitor, a second inductor and a second transformer.

[0023] The positive pole of the third DC filter capacitor, the drain of the ninth switch and the positive pole of the third DC blocking capacitor are connected to the positive pole of an input power supply, the negative pole of the third DC filter capacitor, the source of the tenth switch and the negative pole of the fourth DC blocking capacitor are connected to the negative pole of the input power supply, the source of the ninth switch and the drain of the tenth switch are connected to the first end of the second inductor, the second end of the second inductor, the negative pole of the third DC blocking capacitor and the positive pole of the fourth DC blocking capacitor are connected to the primary coil of the second transformer, the secondary coil of the second transformer is connected to the positive pole of the fifth DC blocking capacitor, the source of the thirteenth switch and the drain of the fourteenth switch, the drain of the eleventh switch, the drain of the thirteenth switch and the positive pole of the fourth DC filter capacitor are connected to the positive pole of an output power supply, the source of the eleventh switch is connected to the negative pole of the fifth DC blocking capacitor and the drain of the twelfth switch respectively, the source of the twelfth switch, the source of the fourteenth switch and the negative pole of the fourth DC filter capacitor are connected to the negative pole of the output power supply.

[0024] Optionally, the dual active bridge converter comprises a ninth switch to a fourteenth switch, a third DC filter capacitor, a fourth DC filter capacitor, a third DC blocking capacitor, a fourth DC blocking capacitor, a fifth DC blocking capacitor, a second inductor and a second transformer.

[0025] The positive electrode of the fifth direct current filtering capacitor, the drain electrode of the fifteenth switch and the positive electrode of an input power source are connected, the negative electrode of the fifth direct current filtering capacitor, the source electrode of the sixteenth switch, the negative electrode of the sixth direct current filtering capacitor and the negative electrode of an input power source are connected, the source electrode of the fifteenth switch and the drain electrode of the sixteenth switch are connected with the first end of the third inductor, the second end of the third inductor and the positive electrode of the sixth direct current filtering capacitor are connected with the primary coil of the third transformer, the secondary coil of the third transformer is connected with the positive electrode of the seventh direct current filtering capacitor, the source electrode of the nineteenth switch and the drain electrode of the twentieth switch, the drain electrode of the seventeenth switch, the drain electrode of the nineteenth switch and the positive electrode of the sixth direct current filtering capacitor are connected with the positive electrode of an output power source, the source electrode of the seventeenth switch is connected with the negative electrode of the seventh direct current filtering capacitor and the drain electrode of the eighteenth switch respectively, the source electrode of the eighteenth switch, the source electrode of the twentieth switch and the negative electrode of the sixth direct current filtering capacitor are connected with the negative electrode of an output power source.

[0026] In addition, to achieve the above object, the present application also provides a modulation device of a dual active bridge converter, which comprises:

[0027] a voltage acquisition module, configured to acquire an output voltage of the dual active bridge converter;

[0028] a control quantity determination module, configured to determine a phase control quantity of the dual active bridge converter according to the output voltage;

[0029] a modulation module, configured to control a switching time sequence of the dual active bridge converter according to the phase control quantity, so as to modulate the dual active bridge converter.

[0030] In addition, to achieve the above object, the present application also provides a modulation device of a dual active bridge converter, which comprises a memory, a processor and a dual active bridge converter modulation program stored in the memory and executable on the processor, and the dual active bridge converter modulation program is configured to implement the steps of the dual active bridge converter modulation method.

[0031] In addition, to achieve the above object, the present application also provides a storage medium, and a dual active bridge converter modulation program is stored on the storage medium, and the dual active bridge converter modulation program is executed by a processor to implement the steps of the dual active bridge converter modulation method.

[0032] The application collects the output voltage of the dual active converter, then determines the phase control quantity of the dual active converter according to the output voltage, and then controls the switching time sequence of the dual active converter according to the phase control quantity, so as to modulate the dual active converter. Compared with the existing transformer, all the switching tubes of the primary and secondary sides are turned on with a duty cycle of 50%. The above-mentioned method of the application can change the phase control quantity with the change of the output voltage of the dual active converter, and control the switching time sequence of the dual active converter according to the phase control quantity, so as to effectively improve the switching characteristics of the switching tube, effectively modulate the switching characteristics of the switching tube in the dual active converter, make the converter have a wider soft switching working area, and improve the charging efficiency of the vehicle-mounted charger. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A circuit structure schematic diagram of a dual active converter for an embodiment of the modulation method of the dual active converter of the application;

[0034] Figure 2 Another circuit structure schematic diagram of a dual active converter for an embodiment of the modulation method of the dual active converter of the application;

[0035] Figure 3 Another circuit structure schematic diagram of a dual active converter for an embodiment of the modulation method of the dual active converter of the application;

[0036] Figure 4 A flowchart of the first embodiment of the modulation method of the dual active converter of the application;

[0037] Figure 5 A schematic diagram of a loop controller for an embodiment of the modulation method of the dual active converter of the application;

[0038] Figure 6 A flowchart of the second embodiment of the modulation method of the dual active converter of the application;

[0039] Figure 7 A switching time sequence diagram for an embodiment of the modulation method of the dual active converter of the application;

[0040] Figure 8 A structure block diagram of the first embodiment of the modulation device of the dual active converter of the application;

[0041] Figure 9 A structure schematic diagram of the modulation device of the dual active converter of the hardware running environment related to the embodiment scheme of the application.

[0042] The objectives, functional characteristics and advantages of the present application will be further illustrated in conjunction with the embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the present application.

[0044] The present application is applied to the on-board charger of the electric vehicle. When the high-voltage isolation DC-DC in the rear stage of the on-board charger adopts the dual-active topology, the modulation method described in the present application can effectively improve the switching characteristics of the switching tube, so that the dual-active converter has a wider soft switching working area, thereby improving the charging efficiency of the on-board charger.

[0045] As shown in Figure 1 , Fig. 1 is a circuit structure schematic diagram of a dual-active converter according to an embodiment of the modulation method of the dual-active converter of the present application. Figure 1 As shown in , Fig. 1 is a circuit structure schematic diagram of a dual-active converter according to an embodiment of the modulation method of the dual-active converter of the present application.

[0046] The dual-active converter comprises: first to eighth switches Q1 to Q8, a first DC filter capacitor C1, a second DC filter capacitor C2, a first DC blocking capacitor Cr1, a second DC blocking capacitor Cr2, a first inductor L1 and a first transformer t1.

[0047] The positive pole of the first DC filter capacitor C1, the drain pole of the first switch Q1 and the drain pole of the third switch Q3 are connected with the positive pole of the input power supply V1, the negative pole of the first DC filter capacitor C1, the source pole of the second switch Q2 and the source pole of the fourth switch Q4 are connected with the negative pole of the input power supply V1, the source pole of the third switch Q3 is connected with the drain pole of the fourth switch Q4, the positive pole of the first DC blocking capacitor Cr1 is connected with the source pole of the first switch Q1 and the drain pole of the second switch Q2 respectively, the negative pole of the first DC blocking capacitor Cr1 is connected with the first end of the first inductor L1, the second end of the first inductor L1 and the drain pole of the fourth switch Q4 are connected with the primary coil of the first transformer T1, the secondary coil of the first transformer T1 is connected with the positive pole of the second DC blocking capacitor Cr2, the source pole of the seventh switch Q7 and the drain pole of the eighth switch Q8, the drain pole of the fifth switch Q5, the drain pole of the seventh switch Q7 and the positive pole of the second DC filter capacitor C2 are connected with the positive pole of the output power supply V2, the source pole of the fifth switch Q5 is connected with the negative pole of the second DC blocking capacitor Cr2 and the drain pole of the sixth switch Q6 respectively, the source pole of the sixth switch Q6, the source pole of the eighth switch Q8 and the negative pole of the second DC filter capacitor C2 are connected with the negative pole of the output power supply V2.

[0048] It should be understood that Figure 1 the topology structure of the dual-active converter in Fig. 1 is the structure of the conventional dual-active converter, and the specific circuit principle can refer to the prior art, and the present embodiment will not be described in more detail.

[0049] As shown inFigure 2 As shown in Figure 2 FIG. 2 is a schematic diagram of another circuit structure of a dual active bridge for an embodiment of the modulation method of the dual active bridge of the present application.

[0050] The dual active bridge comprises a ninth switch Q9 to a fourteenth switch Q14, a third DC filter capacitor C3, a fourth DC filter capacitor C4, a third DC blocking capacitor Cr3, a fourth DC blocking capacitor Cr4, a fifth DC blocking capacitor Cr5, a second inductor L2 and a second transformer t2.

[0051] The positive pole of the third DC filter capacitor C3, the drain of the ninth switch Q9 and the positive pole of the third DC blocking capacitor Cr3 are connected to the positive pole of the input power supply VI, the negative pole of the third DC filter capacitor C3, the source of the tenth switch Q10 and the negative pole of the fourth DC blocking capacitor Cr4 are connected to the negative pole of the input power supply VI, the source of the ninth switch Q9 and the drain of the tenth switch Q10 are connected to the first end of the second inductor L2, the second end of the second inductor L2, the negative pole of the third DC blocking capacitor Cr3 and the positive pole of the fourth DC blocking capacitor Cr4 are connected to the primary coil of the second transformer t2, the secondary coil of the second transformer t2 is connected to the positive pole of the fifth DC blocking capacitor Cr5, the source of the thirteenth switch Q13 and the drain of the fourteenth switch Q14, the drain of the eleventh switch Q11, the drain of the thirteenth switch Q13 and the positive pole of the fourth DC filter capacitor C4 are connected to the positive pole of the output power supply V2, the source of the eleventh switch Q11 is connected to the negative pole of the fifth DC blocking capacitor Cr5 and the drain of the twelfth switch Q12 respectively, the source of the twelfth switch Q12, the source of the fourteenth switch Q14 and the negative pole of the fourth DC filter capacitor C4 are connected to the negative pole of the output power supply V2.

[0052] It can be understood that Figure 2 The topology structure of the dual active bridge in the present application is a symmetrical half-bridge topology structure.

[0053] Further, referring to Figure 3 , Figure 3 FIG. 2 is a schematic diagram of another circuit structure of a dual active bridge for an embodiment of the modulation method of the dual active bridge of the present application.

[0054] As shown in Figure 3 FIG. 2 is a schematic diagram of another circuit structure of a dual active bridge for an embodiment of the modulation method of the dual active bridge of the present application.

[0055] The positive pole of the fifth DC filtering capacitor C5, the drain of the fifteenth switch Q15 and the positive pole of the input power supply V1 are connected, the negative pole of the fifth DC filtering capacitor C5, the source of the sixteenth switch Q16, the negative pole of the sixth DC blocking capacitor Cr6 and the negative pole of the input power supply V1 are connected, the source of the fifteenth switch Q15 and the drain of the sixteenth switch Q16 are connected with the first end of the third inductor L3, the second end of the third inductor L3 and the positive pole of the sixth DC blocking capacitor Cr6 are connected with the primary coil of the third transformer T3, the secondary coil of the third transformer T3 is connected with the positive pole of the seventh DC blocking capacitor Cr7, the source of the nineteenth switch Q19 and the drain of the twentieth switch Q20, the drain of the seventeenth switch Q17, the drain of the nineteenth switch Q19 and the positive pole of the sixth DC filtering capacitor C6 are connected with the positive pole of the output power supply V2, the source of the seventeenth switch Q17 is connected with the negative pole of the seventh DC blocking capacitor Cr7 and the drain of the eighteenth switch Q18 respectively, the source of the eighteenth switch Q18, the source of the twentieth switch Q20 and the negative pole of the sixth DC filtering capacitor C6 are connected with the negative pole of the output power supply V2.

[0056] It can be understood that, Figure 3 The topology structure of the dual active converter in the above formula is also a symmetrical half-bridge topology structure.

[0057] Based on the dual active converter, the embodiment of the application provides a modulation method of the dual active converter. Figure 4 , Figure 4 FIG. 1 is a flow diagram of a first embodiment of the modulation method of the dual active converter.

[0058] In the embodiment, the modulation method of the dual active converter comprises the following steps:

[0059] Step S10: collecting an output voltage of the dual active converter;

[0060] It should be noted that the dual active converter can be used for electric vehicle on-board chargers and the like, and when a dual active topology is used in a high-voltage isolation DC-DC of a rear stage of the on-board charger, the modulation method of the embodiment can effectively improve the switching characteristics of the switch tube.

[0061] It can be understood that the output voltage of the dual active converter refers to an output voltage obtained after a certain voltage is input to the dual active converter for conversion, which can be collected in real time, and can be collected by a voltage collection device, a voltage dividing resistor and the like, which is not limited in the embodiment.

[0062] Step S20: determining a phase control amount of the dual active converter according to the output voltage;

[0063] It should be noted that the phase control quantity of a dual active converter refers to the control variable of the power transmission of the dual active converter. When the phase control quantity increases, the power transmission increases, but if it is too large, the power transmission will decrease.

[0064] Furthermore, in order to accurately determine the phase control quantity, in this embodiment, step S20 includes: inputting the output voltage and the reference voltage to an error amplifier, so that the error amplifier determines an error signal based on the output voltage and the reference voltage when the output voltage is greater than the reference voltage; and inputting the error signal to a proportional-integral converter, so that the proportional-integral converter determines the phase control quantity of the dual active converter based on the error signal.

[0065] Understandably, reference Figure 5 , Figure 5 This is a schematic diagram of the loop controller of an embodiment of the modulation method for a dual active converter according to the present invention. Figure 5 As shown, the error amplifier receives the output voltage and reference voltage of the dual active converter. The reference voltage refers to the output voltage required by the dual active converter, such as 3V, 6V, etc. It can be set according to the user's actual needs. This embodiment does not impose specific restrictions on this.

[0066] In practical implementation, when the output voltage received by the error amplifier is greater than the reference voltage, the error amplifier will generate an error signal. Figure 5 The error signal (indicated by the difference between the output voltage and the reference voltage) is related to the magnitude of the error signal, which can be found in existing technology and will not be elaborated upon in this embodiment. After obtaining the error signal, it is sent to the proportional-integral converter (PIC). Figure 5 The phase control quantity φ is generated after the PI controller in the middle. The specific method of determining the phase control quantity through the proportional integrator can be referred to the existing technology, and this embodiment will not elaborate on it.

[0067] Step S30: Control the switching timing of the dual active converter according to the phase control quantity to modulate the dual active converter.

[0068] Understandably, the switching timing of all transistors in a dual active converter can be controlled based on the phase control quantity to modulate the dual active converter. This embodiment utilizes a phase control quantity proportional to the transmitted power to control the dual active converter.

[0069] The embodiment collects the output voltage of the dual active converter, and then determines the phase control quantity of the dual active converter according to the output voltage, and controls the switching time sequence of the dual active converter according to the phase control quantity, so as to modulate the dual active converter. Compared with the existing transformer in which all the switching tubes of the primary side and the secondary side are turned on with a duty cycle of 50%, the above-mentioned mode of the embodiment can change the phase control quantity with the change of the output voltage of the dual active converter, and control the switching time sequence of the dual active converter according to the phase control quantity, so as to effectively improve the switching characteristics of the switching tube, effectively modulate the switching characteristics of the switching tube in the dual active converter, make the converter have a wider soft switching working area, and thus improve the charging efficiency of the vehicle-mounted charger.

[0070] Reference Figure 6 , Figure 6 FIG. 2 is a flowchart of a second embodiment of the modulation method of the dual active converter.

[0071] Based on the first embodiment, in the embodiment, the step S30 comprises:

[0072] Step S301: controlling the turning on and turning off of the first switching tube to the eighth switching tube according to the phase control quantity, so as to modulate the dual active converter.

[0073] Further, in the embodiment, the step S301 comprises: determining a preset time length according to the phase control quantity; after the sixth switching tube is turned off for the preset time length, the seventh switching tube is turned off, and the fifth switching tube and the eighth switching tube are turned on; after the eighth switching tube is turned off for the preset time length, the sixth switching tube and the seventh switching tube are turned on, and the fifth switching tube is turned off; after the seventh switching tube is turned off for the preset time length, the fifth switching tube and the eighth switching tube are turned on, and the sixth switching tube is turned off; and after the fifth switching tube is turned off for the preset time length, the sixth switching tube and the seventh switching tube are turned on, and the eighth switching tube is turned off.

[0074] It can be understood that, with reference to Figure 7 , Figure 7 FIG. 3 is a switching time sequence diagram of a first embodiment of the modulation method of the dual active converter. Figure 7 The switching time sequence diagram in FIG. 3 is based on Figure 1The topology of the dual active transformer is proposed, assuming that t1-t2 is a first preset time period, t2-t3 is a second preset time period, t3-t4 is a third preset time period, t4-t5 is a fourth preset time period, t5-t6 is a fifth preset time period, t6-t7 is a sixth preset time period, t7-t8 is a seventh preset time period, and t8-t9 is an eighth preset time period. t1-t9 is a modulation period.

[0075] It should be understood that, in the t1-t2 time period, Q7 is turned on, and Q5 / Q6 / Q8 is turned off; in the t2-t3 time period, Q5 / Q8 is turned on, and Q6 / Q7 is turned off; in the t3-t4 time period, Q5 is turned on, and Q6 / Q7 / Q8 is turned off; in the t4-t5 time period, Q6 / Q7 is turned on, and Q5 / Q8 is turned off; in the t5-t6 time period, Q6 is turned on, and Q5 / Q7 / Q8 is turned off; in the t6-t7 time period, Q5 / Q8 is turned on, and Q6 / Q7 is turned off; in the t7-t8 time period, Q8 is turned on, and Q5 / Q6 / Q7 is turned off; and in the t8-t9 time period, Q6 / Q7 is turned on, and Q5 / Q8 is turned off.

[0076] In a specific implementation, the preset time length can be determined according to the phase control amount, that is, the phase control amount is equal to the preset time length, t2-t1, t4-t3, t6-t5, and t8-t7 are the preset time length, and t2-t1=t4-t3=t6-t5=t8-t7=φ. φ represents the phase control amount.

[0077] It can be understood that, Figure 2 The modulation mode of the corresponding dual active transformer topology is the same as described above, and the phase control amount also needs to be determined first, Figure 2 the switching sequence of the ninth switch Q9 is the same as that of the first switch Q1, the switching sequence of the tenth switch Q10 is the same as that of the second switch Q2, and the switching sequences of the eleventh switch Q9 to the fourteenth switch Q14 are the same as those of the fifth switch Q5 to the eighth switch Q8.

[0078] It should be understood that, Figure 3 The modulation mode of the corresponding dual active transformer topology is the same as described above, and the phase control amount also needs to be determined first, Figure 3 the switching sequence of the fifteenth switch Q15 is the same as that of the first switch Q1, the switching sequence of the sixteenth switch Q16 is the same as that of the second switch Q2, and the switching sequences of the seventeenth switch Q17 to the twentieth switch Q20 are the same as those of the fifth switch Q5 to the eighth switch Q8.

[0079] The embodiment controls the opening and closing of the first switch to the eighth switch according to the phase control quantity to modulate the dual active transformer. The embodiment controls the switching sequence of the first switch to the eighth switch of the dual active transformer according to the phase control quantity, so that the switching characteristics of the switching tube can be effectively improved, and the switching characteristics of the switching tube in the dual active transformer can be effectively modulated.

[0080] Referring to Figure 8 , Figure 8 The figure is a structural block diagram of the modulation device of the dual active transformer of the first embodiment of the application.

[0081] As Figure 8 shown, the modulation device of the dual active transformer provided by the embodiment of the application comprises:

[0082] The voltage acquisition module 10 is configured to acquire the output voltage of the dual active transformer.

[0083] The control quantity determination module 20 is configured to determine the phase control quantity of the dual active transformer according to the output voltage.

[0084] The modulation module 30 is configured to control the switching sequence of the dual active transformer according to the phase control quantity to modulate the dual active transformer.

[0085] The embodiment acquires the output voltage of the dual active transformer, then determines the phase control quantity of the dual active transformer according to the output voltage, and controls the switching sequence of the dual active transformer according to the phase control quantity to modulate the dual active transformer. The embodiment determines the phase control quantity of the dual active transformer according to the output voltage, and controls the switching sequence of the dual active transformer according to the phase control quantity. Compared with the prior art in which all the switching tubes of the primary side and the secondary side of the transformer are opened with a duty cycle of 50%, the above-mentioned manner of the embodiment can change the phase control quantity with the change of the output voltage of the dual active transformer, and control the switching sequence of the dual active transformer according to the phase control quantity, so that the switching characteristics of the switching tube can be effectively improved, the switching characteristics of the switching tube in the dual active transformer can be effectively modulated, the transformer has a wider soft switching working area, and the charging efficiency of the vehicle-mounted charger is improved.

[0086] It should be noted that the above-described workflow is only illustrative and does not limit the protection scope of the application. In actual application, a person skilled in the art can select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited here.

[0087] In addition, technical details not described in detail in the embodiment can be referred to the modulation method of the dual active transformer provided by any embodiment of the application, which will not be described here.

[0088] Based on the first embodiment of the modulation device of the dual active bridge converter, the second embodiment of the modulation device of the dual active bridge converter is provided.

[0089] In the embodiment, the control quantity determination module 20 is further configured to input the output voltage and the reference voltage into an error amplifier, so that the error amplifier determines an error signal according to the output voltage and the reference voltage when the output voltage is greater than the reference voltage; and input the error signal into a proportional integrator, so that the proportional integrator determines the phase control quantity of the dual active bridge converter according to the error signal.

[0090] Further, the dual active bridge converter comprises a first switch to an eighth switch, a first DC filter capacitor, a second DC filter capacitor, a first DC blocking capacitor, a second DC blocking capacitor, a first inductor and a first transformer; a positive electrode of the first DC filter capacitor, a drain electrode of the first switch and a drain electrode of the third switch are connected to a positive electrode of an input power supply, a negative electrode of the first DC filter capacitor, a source electrode of the second switch and a source electrode of the fourth switch are connected to a negative electrode of the input power supply, a source electrode of the third switch and a drain electrode of the fourth switch are connected, positive electrodes of the first DC blocking capacitor are connected to a source electrode of the first switch and a drain electrode of the second switch respectively, a negative electrode of the first DC blocking capacitor is connected to a first end of the first inductor, a second end of the first inductor and a drain electrode of the fourth switch are connected to a primary coil of the first transformer, a secondary coil of the first transformer is connected to a positive electrode of the second DC blocking capacitor, a source electrode of the seventh switch and a drain electrode of the eighth switch, a drain electrode of the fifth switch, a drain electrode of the seventh switch and a positive electrode of the second DC filter capacitor are connected to a positive electrode of an output power supply, a source electrode of the fifth switch is connected to a negative electrode of the second DC blocking capacitor and a drain electrode of the sixth switch respectively, a source electrode of the sixth switch, a source electrode of the eighth switch and a negative electrode of the second DC filter capacitor are connected to a negative electrode of the output power supply.

[0091] Further, the modulation module 30 is further configured to control the opening and closing of the first switch to the eighth switch according to the phase control quantity, so as to modulate the dual active bridge converter.

[0092] Further, the modulation module 30 is further configured to: in a first preset time period, turn on the first switch, the fourth switch and the seventh switch, and turn off the second switch, the third switch, the fifth switch, the sixth switch and the eighth switch; in a second preset time period, turn on the first switch, the fourth switch, the fifth switch and the eighth switch, and turn off the second switch, the third switch, the sixth switch and the seventh switch; in a third preset time period, turn on the second switch, the third switch and the fifth switch, and turn off the first switch, the fourth switch, the sixth switch, the seventh switch and the eighth switch; in a fourth preset time period, turn on the second switch, the third switch, the sixth switch and the seventh switch, and turn off the first switch, the fourth switch, the fifth switch and the eighth switch; in a fifth preset time period, turn on the first switch, the fourth switch and the sixth switch, and turn off the second switch, the third switch, the fifth switch, the seventh switch and the eighth switch; in a sixth preset time period, turn on the first switch, the fourth switch, the fifth switch and the eighth switch, and turn off the second switch, the third switch, the sixth switch and the seventh switch; in a seventh preset time period, turn on the second switch, the third switch and the eighth switch, and turn off the first switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch; and in an eighth preset time period, turn on the second switch, the third switch, the sixth switch and the seventh switch, and turn off the first switch, the fourth switch, the fifth switch and the eighth switch; wherein the first preset time period, the second preset time period, the third preset time period, the fourth preset time period, the fifth preset time period, the sixth preset time period, the seventh preset time period and the eighth preset time period are one modulation period; and the first preset time period, the third preset time period, the fourth preset time period and the seventh preset time period are the phase control quantity.

[0093] Further, the dual active bridge converter comprises a ninth switch to a fourteenth switch, a third DC filter capacitor, a fourth DC filter capacitor, a third DC blocking capacitor, a fourth DC blocking capacitor, a fifth DC blocking capacitor, a second inductor and a second transformer; a positive electrode of the third DC filter capacitor, a drain electrode of the ninth switch and a positive electrode of the third DC blocking capacitor are connected with a positive electrode of an input power supply, a negative electrode of the third DC filter capacitor, a source electrode of the tenth switch and a negative electrode of the fourth DC blocking capacitor are connected with a negative electrode of the input power supply, a source electrode of the ninth switch and a drain electrode of the tenth switch are connected with a first end of the second inductor, a second end of the second inductor, a negative electrode of the third DC blocking capacitor and a positive electrode of the fourth DC blocking capacitor are connected with a primary coil of the second transformer, a secondary coil of the second transformer is connected with a positive electrode of the fifth DC blocking capacitor, a source electrode of the thirteenth switch and a drain electrode of the fourteenth switch, a drain electrode of the eleventh switch, a drain electrode of the thirteenth switch and a positive electrode of the fourth DC filter capacitor are connected with a positive electrode of an output power supply, a source electrode of the eleventh switch is connected with a negative electrode of the fifth DC blocking capacitor and a drain electrode of the twelfth switch respectively, a source electrode of the twelfth switch, a source electrode of the fourteenth switch and a negative electrode of the fourth DC filter capacitor are connected with a negative electrode of the output power supply.

[0094] Further, the dual active bridge converter comprises a ninth switch to a fourteenth switch, a third DC filter capacitor, a fourth DC filter capacitor, a third DC blocking capacitor, a fourth DC blocking capacitor, a fifth DC blocking capacitor, a second inductor and a second transformer; a positive electrode of the third DC filter capacitor, a drain electrode of the ninth switch and a positive electrode of the third DC blocking capacitor are connected with a positive electrode of an input power supply, a negative electrode of the third DC filter capacitor, a source electrode of the tenth switch and a negative electrode of the fourth DC blocking capacitor are connected with a negative electrode of the input power supply, a source electrode of the ninth switch and a drain electrode of the tenth switch are connected with a first end of the second inductor, a second end of the second inductor, a negative electrode of the third DC blocking capacitor and a positive electrode of the fourth DC blocking capacitor are connected with a primary coil of the second transformer, a secondary coil of the second transformer is connected with a positive electrode of the fifth DC blocking capacitor, a source electrode of the thirteenth switch and a drain electrode of the fourteenth switch, a drain electrode of the eleventh switch, a drain electrode of the thirteenth switch and a positive electrode of the fourth DC filter capacitor are connected with a positive electrode of an output power supply, a source electrode of the eleventh switch is connected with a negative electrode of the fifth DC blocking capacitor and a drain electrode of the twelfth switch respectively, a source electrode of the twelfth switch, a source electrode of the fourteenth switch and a negative electrode of the fourth DC filter capacitor are connected with a negative electrode of the output power supply.

[0095] Other embodiments or specific implementations of the modulation device of the dual active bridge converter can refer to the above-mentioned method embodiments, which will not be described here.

[0096] Reference Figure 9 , Figure 9This is a schematic diagram of the modulation device structure of a dual active converter in the hardware operating environment involved in the embodiments of this application.

[0097] like Figure 9 As shown, the modulation device of the dual active converter may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0098] Those skilled in the art will understand that Figure 9 The structure shown does not constitute a limitation on the modulation device of the dual active converter, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0099] like Figure 9 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a modulation program for a dual active converter.

[0100] exist Figure 9 In the modulation device of the dual active converter shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the modulation device of the dual active converter of this application can be set in the modulation device of the dual active converter. The modulation device of the dual active converter calls the modulation program of the dual active converter stored in the memory 1005 through the processor 1001 and executes the modulation method of the dual active converter provided in the embodiment of this application.

[0101] In addition, the embodiment of the present application further provides a storage medium, and the storage medium stores a modulation program of the dual active converter. The modulation program of the dual active converter is executed by a processor to implement the steps of the modulation method of the dual active converter.

[0102] It should be noted that, in this document, the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusion, so that a process, method, article, or system that comprises a list of elements does not only include those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article, or system. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or system that includes the element.

[0103] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0104] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and necessary general hardware platforms, and of course, they can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, an optical disk), and includes a plurality of instructions for making a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in various embodiments of the present application.

[0105] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A modulation method of a dual active converter, characterized by, The modulation method of the dual active converter comprises the following steps: Collecting an output voltage of the dual active converter; Determining a phase control quantity of the dual active converter according to the output voltage; Controlling a switch timing of a secondary side circuit of the dual active converter according to the phase control quantity to modulate the dual active converter, wherein the secondary side circuit comprises a fifth switch to an eighth switch, a second DC filter capacitor and a second DC blocking capacitor, a secondary coil of a transformer is connected with a positive electrode of the second DC blocking capacitor, a source electrode of the seventh switch and a drain electrode of the eighth switch, a drain electrode of the fifth switch, the drain electrode of the seventh switch and a positive electrode of the second DC filter capacitor are connected with a positive electrode of an output power supply, a source electrode of the fifth switch is connected with a negative electrode of the second DC blocking capacitor and a drain electrode of the sixth switch respectively, a source electrode of the sixth switch, a source electrode of the eighth switch and a negative electrode of the second DC filter capacitor are connected with a negative electrode of the output power supply; The step of controlling the switch timing of the secondary side circuit of the dual active converter according to the phase control quantity to modulate the dual active converter specifically comprises: Determining a preset time length according to the phase control quantity; After the sixth switch is turned off for the preset time length, the seventh switch is turned off, and the fifth switch and the eighth switch are turned on; After the eighth switch is turned off for the preset time length, the sixth switch and the seventh switch are turned on, and the fifth switch is turned off; After the seventh switch is turned off for the preset time length, the fifth switch and the eighth switch are turned on, and the sixth switch is turned off; After the fifth switch is turned off for the preset time length, the sixth switch and the seventh switch are turned on, and the eighth switch is turned off.

2. The modulation method of a dual active bridge according to claim 1, wherein, The step of determining the phase control quantity of the dual active converter according to the output voltage specifically comprises: Inputting the output voltage and a reference voltage into an error amplifier to make the error amplifier determine an error signal according to the output voltage and the reference voltage when the output voltage is greater than the reference voltage; Inputting the error signal into a proportional integrator to make the proportional integrator determine the phase control quantity of the dual active converter according to the error signal.

3. The modulation method of a dual active bridge according to any one of claims 1-2, wherein, The dual active converter further comprises a first switch to a fourth switch, a first DC filter capacitor, a first DC blocking capacitor, a first inductor and a first transformer; A positive electrode of the first DC filter capacitor, a drain electrode of the first switch and a drain electrode of the third switch are connected with a positive electrode of an input power supply, a negative electrode of the first DC filter capacitor, a source electrode of the second switch and a source electrode of the fourth switch are connected with a negative electrode of the input power supply, a source electrode of the third switch is connected with a drain electrode of the fourth switch, a positive electrode of the first DC blocking capacitor is connected with a source electrode of the first switch and a drain electrode of the second switch respectively, a negative electrode of the first DC blocking capacitor is connected with a first end of the first inductor, a second end of the first inductor and a drain electrode of the fourth switch are connected with a primary coil of the first transformer.

4. The modulation method of a dual active bridge according to any one of claims 1 to 2, wherein, The dual active converter further comprises a ninth switch and a tenth switch, a third DC filter capacitor, a third DC blocking capacitor, a fourth DC blocking capacitor, a second inductor and a second transformer; a positive electrode of the third DC filter capacitor, a drain electrode of the ninth switch and a positive electrode of the third DC blocking capacitor are connected with a positive electrode of an input power supply, a negative electrode of the third DC filter capacitor, a source electrode of the tenth switch and a negative electrode of the fourth DC blocking capacitor are connected with a negative electrode of the input power supply, a source electrode of the ninth switch and a drain electrode of the tenth switch are connected with a first end of the second inductor, a second end of the second inductor, a negative electrode of the third DC blocking capacitor and a positive electrode of the fourth DC blocking capacitor are connected with a primary coil of the second transformer.

5. The modulation method of a dual active bridge according to any one of claims 1-2, wherein, The dual active converter further comprises a fifteenth switch and a sixteenth switch, a fifth DC filter capacitor, a sixth DC blocking capacitor, a third inductor and a third transformer; a positive electrode of the fifth DC filter capacitor and a drain electrode of the fifteenth switch are connected with a positive electrode of an input power supply, a negative electrode of the fifth DC filter capacitor, a source electrode of the sixteenth switch and a negative electrode of the sixth DC blocking capacitor are connected with a negative electrode of the input power supply, a source electrode of the fifteenth switch and a drain electrode of the sixteenth switch are connected with a first end of the third inductor, a second end of the third inductor and a positive electrode of the sixth DC blocking capacitor are connected with a primary coil of the third transformer.

6. A modulation apparatus of a dual active bridge, characterized by, The modulation device of the dual active converter comprises: a voltage acquisition module configured to acquire an output voltage of the dual active converter; a control quantity determination module configured to determine a phase control quantity of the dual active converter according to the output voltage; a modulation module configured to control a switching time sequence of a secondary side circuit of the dual active converter according to the phase control quantity, so as to modulate the dual active converter, wherein the secondary side circuit comprises a fifth switch to an eighth switch, a second DC filter capacitor and a second DC blocking capacitor, a secondary coil of a transformer is connected with a positive electrode of the second DC blocking capacitor, a source electrode of the seventh switch and a drain electrode of the eighth switch, a drain electrode of the fifth switch, a drain electrode of the seventh switch and a positive electrode of the second DC filter capacitor are connected with a positive electrode of an output power supply, a source electrode of the fifth switch is connected with a negative electrode of the second DC blocking capacitor and a drain electrode of the sixth switch respectively, a source electrode of the sixth switch, a source electrode of the eighth switch and a negative electrode of the second DC filter capacitor are connected with a negative electrode of the output power supply; the modulation module is further configured to determine a preset time length according to the phase control quantity; after the sixth switch is turned off for the preset time length, the seventh switch is turned off and the fifth switch and the eighth switch are turned on; after the eighth switch is turned off for the preset time length, the sixth switch and the seventh switch are turned on and the fifth switch is turned off; after the seventh switch is turned off for the preset time length, the fifth switch and the eighth switch are turned on and the sixth switch is turned off; and after the fifth switch is turned off for the preset time length, the sixth switch and the seventh switch are turned on and the eighth switch is turned off.

7. A modulation device for a dual active bridge, characterized in that The device comprises a memory, a processor and a dual active transformer modulation program stored on the memory and executable on the processor, the dual active transformer modulation program being configured to implement the steps of the dual active transformer modulation method according to any one of claims 1 to 5.

8. A storage medium, characterized by The storage medium stores a dual active transformer modulation program, the dual active transformer modulation program implementing the steps of the dual active transformer modulation method according to any one of claims 1 to 5 when executed by a processor.

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