Magnetic integration device, magnetic integration device control method and vehicle

Abstract

The invention provides a magnetic integration device, a magnetic integration device control method and a vehicle. The magnetic integration device comprises a primary side circuit, a transformer, a secondary side circuit and a control circuit. The control circuit is used for receiving a detection signal with a first duty ratio and determining a first detection voltage of the primary side circuit based on the detection signal; the control circuit is also used for obtaining a second detection voltage of the secondary circuit. The control circuit is also used for configuring the first detection voltage as a first preset voltage when the first duty ratio is out of a first preset range and the second detection voltage is in a preset voltage range; the duty ratio corresponding to the first preset voltage is within a first preset range. According to the invention, the voltage sampling abnormity of the primary side circuit is determined by analyzing the voltage of the primary side circuit and the voltage of the secondary side circuit, and the detection voltage of the primary side circuit is set to be the fixed value which does not trigger the overvoltage fault, so that the overvoltage fault of the primary side circuit is prevented from being triggered by the sampling abnormity, and the stability of the magnetic integration device is improved.

Description

Technical Field

[0001] This application relates to the field of vehicles, and particularly to a magnetic integration device, a control method for the magnetic integration device, and a vehicle. Background Art

[0002] Magnetic integration technology optimizes the design of transformers to reduce the volume and weight of transformers and improve the power density and efficiency of the system. Specifically, magnetic integration technology integrates multiple transformers on one magnetic circuit, and reduces the number and volume of magnetic cores by sharing magnetic cores, thereby reducing the cost and weight of the system. For example, in a magnetic integrated on-vehicle charger, the on-vehicle charger and the voltage conversion circuit share a magnetic core, thereby reducing the volume of the charger. However, since the on-vehicle charger and the voltage conversion circuit share a magnetic core, the change in the electrical signal on the charger side will affect the electrical signal of the voltage conversion circuit. When a failure occurs in the charger, it will also affect the normal operation of the voltage conversion circuit, and even cause the vehicle to be unable to drive normally. Summary of the Invention

[0003] In order to solve the problems in the prior art, this application provides a magnetic integration device, a control method for the magnetic integration device, and a vehicle, so as to improve the stability of the magnetic integration device.

[0004] This application provides a magnetic integration device, which includes a primary circuit, a transformer, a secondary circuit, and a control circuit; the transformer is used to transfer voltage between the primary circuit and the secondary circuit; the control circuit is used to receive a detection signal with a first duty ratio and determine a first detection voltage of the primary circuit based on the detection signal; the control circuit is further used to obtain a second detection voltage of the secondary circuit; The control circuit is further used to configure the first detection voltage as a first preset voltage when the first duty ratio is outside a first preset range and the second detection voltage is within a preset voltage range; the duty ratio corresponding to the first preset voltage is within the first preset range.

[0005] In one embodiment, the primary circuit includes a voltage conversion module and a bus capacitor; the bus capacitor is connected in parallel with the voltage conversion module; a first end of the voltage conversion module is used to access a first voltage; the voltage conversion module is used to convert the first voltage into a second voltage and output it; The control circuit is used to output a first control signal with a preset duty ratio, and the first control signal is used to control the operation of the voltage conversion module to form a discharge loop with the bus capacitor; The control circuit is further configured to increase the duty cycle of the first control signal when the first duty cycle is within a second preset range and the second detection voltage is within a preset voltage range; the first preset range is greater than the second preset range; the duty cycle corresponding to the first preset voltage is less than the second preset range.

[0006] In one embodiment, the voltage conversion module includes a power factor correction circuit and a first voltage conversion circuit; A first end of the power factor correction circuit is configured to be connected to the first voltage, a second end of the power factor correction circuit is electrically connected to the bus capacitor, a first end of the first voltage conversion circuit is electrically connected to the bus capacitor, and a second end of the first voltage conversion circuit is electrically connected to a primary side of the transformer; The power factor correction circuit is configured to adjust the power factor of the first voltage; the first voltage conversion circuit is configured to convert the first voltage output by the power factor correction circuit into the second voltage; The first control signal is configured to control the operation of the first voltage conversion circuit to form a discharge loop with the bus voltage.

[0007] In one embodiment, the first voltage conversion circuit includes a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube; A first end of the first switching tube is electrically connected to the power factor correction circuit, a second end of the first switching tube is electrically connected to a first end of the second switching tube, and a second end of the second switching tube is electrically connected to the power factor correction circuit; a first end of the third switching tube is electrically connected to the first end of the first switching tube, a second end of the third switching tube is electrically connected to a first end of the fourth switching tube, and a second end of the fourth switching tube is electrically connected to the second end of the second switching tube; a third end of the first switching tube, a third end of the second switching tube, a third end of the third switching tube, and a third end of the fourth switching tube are respectively electrically connected to the control circuit; The first control signal is configured to control the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube to be all turned on to form a discharge loop with the bus capacitor.

[0008] In one embodiment, the secondary side circuit includes a second voltage conversion circuit; The second voltage conversion circuit is electrically connected to a secondary side of the transformer; the second voltage conversion circuit is configured to convert the second voltage into the third voltage and output the third voltage; When the secondary circuit is in the working state, the control circuit is further configured to obtain the current of the second voltage conversion circuit, and control the second voltage conversion circuit to stop working when the current of the second voltage conversion circuit is greater than a preset current.

[0009] In one embodiment, the control circuit is further configured to increase the preset current when the first detection voltage is less than a second preset voltage; the second preset voltage is less than the first preset voltage.

[0010] In one embodiment, the secondary circuit further includes a third voltage conversion circuit; The second voltage conversion circuit and the third voltage conversion circuit are respectively electrically connected to the secondary side of the transformer; The third voltage conversion circuit is configured to convert the third voltage into a fourth voltage and output it; the third voltage is less than the fourth voltage.

[0011] The present application also provides a method for controlling a magnetic integration device, where the magnetic integration device includes a primary circuit, a transformer, and a secondary circuit; the method includes: Receiving a detection signal with a first duty cycle, and determining a first detection voltage of the primary circuit based on the detection signal; Obtaining a second detection voltage of the secondary circuit; If the first duty cycle is outside a first preset range and the second detection voltage is within a preset voltage range, configuring the first detection voltage as a first preset voltage; the duty cycle corresponding to the first preset voltage is within the first preset range.

[0012] In one embodiment, the primary circuit includes a voltage conversion module and a bus capacitor, the voltage conversion module is configured to receive a first control signal with a preset duty cycle, and the first control signal is used to control the operation of the voltage conversion module to form a discharge loop with the bus capacitor; the method for controlling the magnetic integration device further includes: If the first duty cycle is within a second preset range and the second detection voltage is within a preset voltage range, increasing the duty cycle of the first control signal; the first preset range is greater than the second preset range; the duty cycle corresponding to the first preset voltage is less than the second preset range.

[0013] The present application also provides a vehicle, including the above magnetic integration device.

[0014] This application determines that the voltage sampling of the primary circuit is abnormal by analyzing the voltage of the primary circuit and the voltage of the secondary circuit, and sets the detected voltage of the primary circuit to a fixed value that will not trigger an overvoltage fault, so as to avoid the overvoltage fault of the primary circuit triggered by sampling abnormality, thereby preventing the primary circuit and the secondary circuit from stopping working during sampling abnormality and improving the stability of the magnetic integration device. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the module structure of an embodiment of the magnetic integration device of this application.

[0016] Figure 2 It is a schematic diagram of the circuit structure of an embodiment of the magnetic integration device of this application.

[0017] Figure 3 It is a schematic diagram of the discharge circuit when the third switching tube of this application is open.

[0018] Figure 4 It is a schematic diagram of the discharge circuit when the second switching tube of this application is open.

[0019] Figure 5 It is a schematic diagram of the discharge circuit when the second and third switching tubes of this application are open.

[0020] Figure 6 It is a schematic diagram of the discharge circuit when the first switching tube of this application is open.

[0021] Figure 7 It is a schematic diagram of the discharge circuit when the fourth switching tube of this application is open.

[0022] Figure 8 It is a schematic diagram of the discharge circuit when the first and fourth switching tubes of this application are open.

[0023] Figure 9 It is a schematic diagram of the circuit structure of an embodiment of the voltage conversion module of this application.

[0024] Figure 10 It is a schematic diagram of the circuit structure of an embodiment of the secondary circuit of this application.

[0025] Figure 11 It is a flowchart of an embodiment of the control method of the magnetic integration device of this application.

[0026] Figure 12 It is a flowchart of another embodiment of the control method of the magnetic integration device of this application.

[0027] Description of main component symbols: Magnetic integration device - 100; Primary circuit - 110; Transformer - 120; Secondary circuit - 130; Control circuit - 140; Voltage conversion module - 111; Bus capacitor - C0; Resonant circuit - 112; Sampling circuit - 150; Voltage detection circuit - 151; Signal transmission circuit - 152; Power factor correction circuit - 111a; First voltage conversion circuit - 111b; First switching transistor - Q1; Second switching transistor - Q2; Third switching transistor - Q3; Fourth switching transistor - Q4; Second voltage conversion circuit - 131; Current detection circuit - 153; Third voltage conversion circuit - 132.

[0028] The following specific embodiments will further illustrate the present application in conjunction with the above - mentioned drawings. Specific embodiments

[0029] The following description will refer to the drawings to more comprehensively describe the content of the present application. The exemplary embodiments shown in the drawings are of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0030] The terms used herein are for the purpose of describing particular exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. Further, when used herein, "comprises" and / or "comprising" and / or "has", integers, steps, operations, components and / or components, but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or their groups.

[0031] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Further, terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the relevant art and the content of this application, and will not be interpreted as idealized or overly formal meanings.

[0032] The following content will describe the exemplary embodiments in conjunction with the drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0033] Refer to Figure 1 and Figure 2, this application proposes a magnetic integration device 100, which includes a primary circuit 110, a transformer 120, a secondary circuit 130, and a control circuit 140. The transformer 120 is used to transfer voltage between the primary circuit 110 and the secondary circuit 130.

[0034] In one embodiment, the first end of the primary circuit 110 is used to connect to a first voltage; the primary circuit 110 is used to convert the first voltage into a second voltage and output it; the second voltage is less than or equal to the first voltage. The primary side of the transformer 120 is electrically connected to the second end of the primary circuit 110. The second end of the secondary circuit 130 is used to be electrically connected to an electrical device, and the third end of the secondary circuit 130 is used to connect to a supply voltage; the secondary circuit 130 is used to convert the second voltage into a third voltage and output it; the third voltage is less than the second voltage. The control circuit 140 is electrically connected to the primary circuit 110 and the secondary circuit 130 respectively.

[0035] In this embodiment, the magnetic integration device 100 can be an inverter, a charger, etc. The first end of the primary circuit 110 can be connected to an AC voltage or a DC voltage. The control circuit 140 can control the primary circuit 110 to perform operations such as rectification, filtering, step-up / step-down on the AC voltage, convert the AC voltage into a second voltage, and transmit the second voltage to the secondary circuit 130 through the electromagnetic induction of the transformer 120. Alternatively, the control circuit 140 can control the primary circuit 110 to perform operations such as filtering, step-up / step-down on the DC voltage, convert the DC voltage into a second voltage, and transmit the second voltage to the secondary circuit 130 through the transformer 120. The control circuit 140 can control the secondary circuit 130 to perform step-up / step-down on the second voltage, convert the second voltage into a third voltage required by the subsequent electrical device, so as to supply power to the electrical device. The first end of the secondary circuit 130 can also be connected to a supply voltage (for example, the voltage output by a battery module), and the control circuit 140 can also control the secondary circuit 130 to convert the supply voltage into a third voltage required by the subsequent electrical device, so as to supply power to the electrical device. Among them, the magnetic integration device 100 can be applied to vehicles, ships and other means of transportation, or home appliances such as sweeping robots and electric fans. The electrical device can be a drive motor, a communication device, a battery module, etc.

[0036] In one embodiment, when the magnetic integration device 100 is applied to a vehicle, the electrical device can include a battery pack. The primary circuit 110 can convert an AC voltage or a DC voltage into a second voltage, and then convert it into a third voltage through the secondary circuit 130 to charge the battery module. When the charger is not working, the battery module can output a supply voltage, and the secondary circuit 130 can convert the supply voltage into a third voltage to supply power to other electrical devices.

[0037] In one embodiment, the primary circuit 110 further includes a resonant circuit 112. The resonant circuit 112 may include an inductor, a capacitor, etc. The first end of the resonant circuit 112 is electrically connected to the second end of the primary circuit 110, and the second end of the resonant circuit 112 is connected to the primary side of the transformer 120. When the inductor and capacitor in the resonant circuit 112 are connected in series, resonance occurs at a specific frequency, which can reduce the impedance in the circuit and increase the current in the circuit. In this state, the electric field energy in the capacitor and the magnetic field energy in the inductor are converted and compensated for each other, and the power supply only needs to supply the electric energy consumed by the resistor in the circuit, thereby reducing the reactive power and improving the circuit efficiency.

[0038] In one embodiment, the magnetic integration device 100 further includes a sampling circuit 150. The sampling circuit 150 can detect the voltage of the primary circuit 110 and output a detection signal with a first duty cycle based on the collected voltage. The control circuit 140 can determine the voltage of the primary circuit 110 according to the first duty cycle. For example, a first duty cycle of 10% - 90% corresponds to the voltage of the primary circuit 110 of 0V - 500V. When the duty cycle is 10%, the voltage of the primary circuit 110 is 0V; when the duty cycle is 30%, the voltage of the primary circuit 110 is 200V; when the duty cycle is 75%, the voltage of the primary circuit 110 is 430V.

[0039] In one embodiment, the control circuit 140 is further configured to configure the first detection voltage as a first preset voltage when the first duty cycle is outside a first preset range and the second detection voltage is within a preset voltage range; the first preset range is greater than the second preset range. The first preset voltage and the first preset range can be set according to actual applications. For example, the first preset voltage can be set as the voltage threshold for triggering an overvoltage fault in the secondary circuit 130.

[0040] In this embodiment, when the secondary circuit 130 is operating normally, the first detection voltage of the primary circuit 110 should be within the normal range, that is, the first duty cycle should be within the first preset range, and the second detection voltage of the secondary circuit 130 should be within the preset voltage range. The preset voltage range can be set as the voltage range for the normal operation of the secondary circuit 130.

[0041] If the first duty cycle is outside the first preset range and the second detected voltage is within the preset voltage range, it indicates that the detection signal is abnormal, which may trigger an overvoltage fault in the primary circuit 110, causing the secondary circuit 130 to stop working. At this time, the control circuit 140 configures the first detected voltage to the first preset voltage. That is to say, in the case of an abnormal detection signal, the first preset voltage is used as the first detected voltage, so that the first preset voltage is less than the voltage that triggers the overvoltage fault and is within the normal voltage range of the primary circuit 110. In this way, it is possible to avoid the overvoltage fault of the primary circuit 110 triggered by abnormal sampling, thereby preventing the primary circuit 110 and the secondary circuit 130 from stopping working during abnormal sampling and improving the stability of the magnetic integration device 100.

[0042] For example, when the primary circuit 110 is working and the secondary circuit 130 is also in the working state, if the detection signal output by the sampling circuit 150 is outside the first preset range and the second detected voltage is within the preset voltage range, it indicates that the sampling of the primary circuit 110 by the sampling circuit 150 is abnormal. At this time, the control circuit 140 configures the first detected voltage to the first preset voltage.

[0043] When the primary circuit 110 is not working and the secondary circuit 130 is in the working state, since the transformer 120 transmits electrical energy through electromagnetic induction, when the secondary circuit 130 is working and the primary circuit 110 is not working, the transformer 120 will also transmit electrical energy to the primary circuit 110 through electromagnetic induction. If the detection signal output by the sampling circuit 150 is outside the first preset range and the second detected voltage is within the preset voltage range, it indicates that the sampling of the primary circuit 110 by the sampling circuit 150 is abnormal. At this time, the control circuit 140 configures the first detected voltage to the first preset voltage. Among them, the first preset range can be set according to actual applications. For example, it is set to 10~90%. If the first duty cycle is less than 10% or greater than 90%, it means that the first duty cycle is abnormal, that is, the detection signal is abnormal.

[0044] In an embodiment, the control circuit 140 is further configured to configure the first detected voltage to the first preset voltage within the first preset duration when the first duty cycle is outside the first preset range and the second detected voltage is within the preset voltage range.

[0045] Among them, the first preset duration can be set according to actual applications. For example, it is set to 100ms, 150ms, 200ms, etc., and this application does not limit it. In this way, it is possible to avoid misjudgment by the control circuit 140 caused by short-term voltage fluctuations.

[0046] This application determines that the voltage sampling of the primary circuit 110 is abnormal by analyzing the voltage of the primary circuit 110 and the voltage of the secondary circuit 130, and sets the detected voltage of the primary circuit 110 to a fixed value that will not trigger an overvoltage fault, so as to avoid the overvoltage fault of the primary circuit 110 triggered by sampling abnormality, thereby preventing the primary circuit 110 and the secondary circuit 130 from stopping working during sampling abnormality and improving the stability of the magnetic integration device 100.

[0047] In one embodiment, the primary circuit 110 includes a voltage conversion module 111 and a bus capacitor C0. The bus capacitor C0 is connected in parallel with the voltage conversion module 111; the first end of the voltage conversion module 111 is used to connect to a first voltage; the voltage conversion module 111 is used to convert the first voltage into a second voltage and output it. The bus capacitor C0 can absorb voltage fluctuations and make the voltage more stable. The control circuit 140 is used to output a first control signal with a preset duty ratio, and the first control signal is used to control the operation of the voltage conversion module 111 to form a discharge loop with the bus capacitor C0.

[0048] It can be understood that the transformer 120 transmits power through electromagnetic induction. When the voltage conversion module 111 is working, the transformer 120 transmits the second voltage output by the voltage conversion module 111 to the secondary circuit 130 through electromagnetic induction. When the secondary circuit 130 is working and the primary circuit 110 is not working, the transformer 120 will also transmit electrical energy to the voltage conversion module 111 through electromagnetic induction. The voltage conversion module 111 includes devices such as multiple MOS transistors (Metal-Oxide-Semiconductor Field Effect Transistor), capacitors, and inductors. The MOS transistor can form a loop with the bus capacitor C0 through the body diode. As the secondary circuit 130 continuously works and transmits electrical energy to the primary circuit 110, the voltage on the bus capacitor C0 becomes larger and larger. If the voltage of the bus capacitor C0 is too large, it may damage circuit devices or trigger a protection mechanism. Therefore, when the secondary circuit 130 is working and the primary circuit 110 is not working, the control circuit 140 can output a first control signal to control the MOS transistors in the voltage conversion module 111 to conduct according to a preset duty ratio, form a discharge circuit with the bus capacitor C0, and thus discharge the electrical energy in the bus capacitor C0 to reduce the voltage of the bus capacitor C0.

[0049] The control circuit 140 is further configured to increase the duty ratio of the first control signal when the first duty ratio is within a second preset range and the second detected voltage is within a preset voltage range; the first preset range is greater than the second preset range; the duty ratio corresponding to the first preset voltage is less than the second preset range.

[0050] Under normal circumstances, the control circuit 140 controls the MOS transistor in the voltage conversion module 111 to conduct according to a preset duty ratio, so that the voltage of the bus capacitor C0 can be maintained within a range less than the first preset voltage. However, if one of the MOS transistors or electronic devices in the discharge circuit is open, it may cause the voltage of the bus capacitor C0 to be discharged untimely, and the voltage of the bus capacitor C0 accumulates and increases, thereby triggering an overvoltage fault in the primary circuit 110, causing the control circuit 140 to control the secondary circuit 130 to stop working according to the overvoltage fault.

[0051] Therefore, when the first duty ratio is within the second preset range and the second detected voltage is within the preset voltage range, it indicates that the voltage of the bus capacitor C0 corresponding to the first duty ratio is too high and the secondary circuit 130 is not overvoltage. At this time, the control circuit 140 increases the duty ratio of the first control signal, increases the voltage that the MOS transistor can pass through per unit time, thereby increasing the voltage discharged per unit time and reducing the voltage of the bus capacitor C0 to prevent the overvoltage fault caused by the excessive voltage of the bus capacitor C0. Among them, the second preset range and the preset duty ratio can be set according to actual applications.

[0052] For example, when the overvoltage fault is triggered, the voltage of the bus capacitor C0 is 500V. The second preset range can be set to 75% - 90%, corresponding to the voltage of the bus capacitor C0 being greater than 430V. The preset duty ratio of the first control signal can be set to 10%, and the increased duty ratio of the first control signal can be set to 30%. When the first duty ratio is less than 75%, the control circuit 140 can control the voltage conversion module 111 to stop working to reduce energy consumption.

[0053] In an embodiment, the control circuit 140 can also increase the duty ratio of the first control signal when the first duty ratio continuously remains within the second preset range and the second detected voltage continuously remains less than the first preset voltage within the second preset duration. Among them, the second preset duration can be set according to actual applications. For example, under normal circumstances, the time required for the voltage of the bus capacitor C0 to drop from 500V to 400V through the discharge circuit is 150ms, then the second preset duration can be set to 200ms. In addition, the second preset duration can also be set to other values, and this application does not limit this. In this way, it is possible to avoid misjudgment of the control circuit 140 caused by short-term voltage fluctuations.

[0054] In one embodiment, the sampling circuit 150 includes a voltage detection circuit 151 and a signal transmission circuit 152. The first end of the voltage detection circuit 151 is electrically connected to the bus capacitor C0. The second end of the voltage detection circuit 151 is electrically connected to the first end of the signal transmission circuit 152. The second end of the signal transmission circuit 152 is electrically connected to the control circuit 140. The voltage detection circuit 151 is configured to detect the voltage of the bus capacitor C0. The signal transmission circuit 152 is configured to output a voltage signal with a first duty cycle to the control circuit 140 based on the voltage of the bus capacitor C0.

[0055] In this embodiment, the voltage detection circuit 151 can be implemented by using a voltage-dividing resistor, and the signal transmission circuit 152 can be implemented by using a DSP (Digital Signal Processing) chip, an isolation chip, etc. The voltage detection circuit 151 divides the voltage of the bus capacitor C0. The signal transmission circuit 152 outputs a voltage signal with a first duty cycle to the control circuit 140 based on the voltage of the bus capacitor C0 after voltage division. The first duty cycle refers to the ratio of the width of the voltage signal to the period. The voltage signal can transmit information through the change of the duty cycle. In this way, the control circuit 140 can determine the first detected voltage of the bus capacitor C0 according to the first duty cycle.

[0056] In one embodiment, please refer to Figure 9 , the voltage conversion module 111 includes a power factor correction circuit 111a and a first voltage conversion circuit 111b. The first end of the power factor correction circuit 111a is configured to connect to a first voltage. The second end of the power factor correction circuit 111a is electrically connected to the bus capacitor C0. The first end of the first voltage conversion circuit 111b is electrically connected to the bus capacitor C0. The second end of the first voltage conversion circuit 111b is electrically connected to the primary side of the transformer 120. The power factor correction circuit 111a is configured to adjust the power factor of the first voltage. The first voltage conversion circuit 111b is configured to convert the first voltage output by the power factor correction circuit 111a into a second voltage. The first control signal is used to control the operation of the first voltage conversion circuit 111b to form a discharge loop with the bus voltage.

[0057] In this embodiment, the power factor correction circuit 111a can be implemented by using a switching transistor, a capacitor, an inductor, etc. The power factor correction circuit 111a controls the switching transistor to work, makes the input current continuous, and as close as possible to the voltage waveform (sine wave), or makes the harmonic components of the input current as small as possible, thereby improving the power factor.

[0058] In one embodiment, the first voltage conversion circuit 111b includes a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, and a fourth switching transistor Q4. A first end of the first switching transistor Q1 is electrically connected to the power factor correction circuit 111a, a second end of the first switching transistor Q1 is electrically connected to a first end of the second switching transistor Q2, and a second end of the second switching transistor Q2 is electrically connected to the power factor correction circuit 111a; a first end of the third switching transistor Q3 is electrically connected to the first end of the first switching transistor Q1, a second end of the third switching transistor Q3 is electrically connected to a first end of the fourth switching transistor Q4, and a second end of the fourth switching transistor Q4 is electrically connected to the second end of the second switching transistor Q2; a third end of the first switching transistor Q1, a third end of the second switching transistor Q2, a third end of the third switching transistor Q3, and a third end of the fourth switching transistor Q4 are respectively electrically connected to the control circuit 140. The first control signal is used to control the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 to be all turned on to form a discharge loop with the bus capacitor C0.

[0059] In this embodiment, under normal circumstances, when the secondary circuit 130 is operating, the control circuit 140 can control the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 to be all turned on to form a discharge loop with the bus capacitor C0.

[0060] If the first detected voltage is greater than or equal to the first preset voltage, it indicates that there is an open or drive-failed switching transistor among the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4. At this time, the control circuit 140 increases the duty cycle of the first control signal to control the normal switching transistors to operate with a larger duty cycle to increase the discharge speed of the voltage of the bus capacitor C0. Figures 3 to 8 It is a discharge loop when one or two of the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 fail.

[0061] In one embodiment, please refer to Figure 10 , the secondary circuit 130 includes a second voltage conversion circuit 131. The second voltage conversion circuit 131 is electrically connected to the secondary side of the transformer 120; the second voltage conversion circuit 131 is used to convert the second voltage into the third voltage and output it. When the secondary circuit 130 is in an operating state, the control circuit 140 is further used to obtain the current of the second voltage conversion circuit 131, and in the case where the current of the second voltage conversion circuit 131 is greater than the preset current, control the second voltage conversion circuit 131 to stop operating.

[0062] In this embodiment, the circuit for the second voltage conversion can be implemented using MOS transistors, capacitors, etc. The control circuit 140 can output a PWM signal to control the conduction / disconnection of the MOS transistor in the second voltage conversion circuit 131, and convert the second voltage or the supply voltage into the third voltage required by the electrical device.

[0063] The sampling circuit 150 may further include a current detection circuit 153. The current detection circuit 153 can be implemented using a detection circuit, a current detection chip, etc. The current detection circuit 153 is used to detect the current of the second voltage conversion circuit 131. If the detected current of the current detection circuit 153 is greater than the preset current, it indicates that the current in the second voltage conversion circuit 131 is too large. At this time, the control circuit 140 controls the second voltage conversion circuit 131 to stop working to avoid damage to the device due to excessive current.

[0064] In one embodiment, the control circuit 140 is further configured to increase the preset current when the first detected voltage is less than the second preset voltage.

[0065] In this embodiment, if the voltage of the bus capacitor C0 is less than the second preset voltage, it indicates that there is a short circuit in the devices of the first voltage conversion circuit 111b. The short circuit of the devices in the first voltage conversion circuit 111b will cause an increase in the current of the first voltage conversion circuit 111b, and further cause an increase in the current of the second voltage conversion circuit 131, even exceeding the preset current and triggering an overcurrent fault. Therefore, when the voltage of the bus capacitor C0 is less than the second preset voltage, the control circuit 140 increases the preset current to increase the threshold for the second voltage conversion circuit 131 to trigger an overcurrent fault, so as to ensure the stable operation of the second voltage conversion circuit 131. Among them, the second preset voltage and the preset current can be set according to actual applications. For example, the second preset voltage can be set to 30V, and the preset current can be set to 120A. If the voltage of the bus capacitor C0 is less than the second preset voltage, the preset current is increased to 150A. In addition, the second preset voltage and the preset current can also be set to other values, which are not limited here.

[0066] In one embodiment, the control circuit 140 is further configured to increase the preset current when the first detected voltage is less than the second preset voltage and the current of the second voltage conversion circuit 131 is greater than the preset current. If the short circuit fault in the first voltage conversion circuit 111b causes the current of the second voltage conversion circuit 131 to be greater than the preset current, the preset current is increased. If the short circuit fault in the first voltage conversion circuit 111b has little impact on the second voltage conversion circuit 131, the control circuit 140 may not respond.

[0067] In one embodiment, the control circuit 140 is further configured to increase the preset current when the first detected voltage is continuously less than the second preset voltage within a third preset duration. The third preset duration can be set according to actual applications. For example, it can be set to 100 ms, 150 ms, 200 ms, etc., and the present application does not limit this. In this way, it is possible to avoid misjudgment of the control circuit 140 caused by short-term duty cycle fluctuations.

[0068] In one embodiment, please refer to Figure 10 , the secondary circuit 130 further includes a third voltage conversion circuit 132. The second voltage conversion circuit 131 and the third voltage conversion circuit 132 are respectively electrically connected to the secondary side of the transformer 120. The third voltage conversion circuit 132 is configured to convert the third voltage into a fourth voltage and output it; the third voltage is less than the fourth voltage.

[0069] In this embodiment, the third voltage conversion circuit 132 can be implemented by a buck circuit. The second voltage output by the second voltage conversion circuit 131 can be transmitted to the third voltage conversion circuit 132 through the transformer 120, and then converted into a fourth voltage by the third voltage conversion circuit 132 and output to the electrical device. In this way, the second voltage conversion circuit 131 and the third voltage conversion circuit 132 can respectively output different magnitudes of voltages to supply power to electrical devices with different voltage requirements.

[0070] The present application also provides a vehicle, including the above-mentioned magnetic integration device 100. Among them, the vehicle can be an electric vehicle or a hybrid vehicle.

[0071] The detailed structure of the magnetic integration device 100 can refer to the above embodiment and will not be elaborated here; it can be understood that since the above-mentioned magnetic integration device 100 is used in the vehicle of the present application, the embodiments of the vehicle of the present application include all the technical solutions of all the embodiments of the above-mentioned magnetic integration device 100, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0072] Refer to Figure 11 , the present application also provides a method for controlling a magnetic integration device 100, which can be applied to the control circuit 140 of the magnetic integration device 100. The magnetic integration device 100 further includes a primary circuit 110, a transformer 120, and a secondary circuit 130; the primary circuit 110 is configured to receive a first control signal and form a discharge loop based on the first control signal; the method includes: S1: Receive a detection signal with a first duty cycle and determine a first detected voltage of the bus capacitor C0 based on the detection signal.

[0073] S2: Obtain a second detected voltage of the secondary circuit 130.

[0074] S3: If the first duty ratio is outside the first preset range and the second detected voltage is within the preset voltage range, configure the first detected voltage as the first preset voltage; the duty ratio corresponding to the first preset voltage is within the first preset range.

[0075] In this embodiment, the magnetic integration device 100 can be an inverter, a charger, etc. The first end of the primary circuit 110 can be connected to an AC voltage or a DC voltage. The control circuit 140 can control the primary circuit 110 to rectify, filter, step up / down, etc. the AC voltage, convert the AC voltage into a second voltage, and transmit the second voltage to the secondary circuit 130 through the electromagnetic induction of the transformer 120. Alternatively, the control circuit 140 can control the primary circuit 110 to filter, step up / down, etc. the DC voltage, convert the DC voltage into a second voltage, and transmit the second voltage to the secondary circuit 130 through the transformer 120. The bus capacitor C0 can absorb voltage fluctuations to make the voltage more stable. The control circuit 140 can control the secondary circuit 130 to step up / down the second voltage and convert the second voltage into a third voltage required by the subsequent electrical equipment to supply power to the electrical equipment. The first end of the secondary circuit 130 can also be connected to a supply voltage (for example, the voltage output by the battery module), and the control circuit 140 can also control the secondary circuit 130 to convert the supply voltage into a third voltage required by the subsequent electrical equipment to supply power to the electrical equipment. Among them, the magnetic integration device 100 can be applied to vehicles, ships and other transportation tools, or household devices such as sweeping robots and electric fans. For example, when the magnetic integration device 100 is applied to a vehicle, the electrical equipment can be a drive motor, an in-vehicle communication device, a battery pack, etc.

[0076] When the secondary circuit 130 is operating normally, the first detected voltage of the primary circuit 110 should be within the normal range, that is, the first duty ratio should be within the first preset range, and the second detected voltage of the secondary circuit 130 should be within the preset voltage range. Among them, the preset voltage range can be set as the voltage range for the secondary circuit 130 to operate normally.

[0077] If the first duty ratio is outside the first preset range and the second detected voltage is within the preset voltage range, it indicates that the detection signal is abnormal, which may trigger an overvoltage fault in the primary circuit 110, resulting in the secondary circuit 130 stopping working. At this time, the control circuit 140 configures the first detected voltage as the first preset voltage. That is to say, in the case of an abnormal detection signal, the first preset voltage is used as the first detected voltage, so that the first preset voltage is less than the voltage that triggers the overvoltage fault and is within the normal voltage range of the primary circuit 110. In this way, it is possible to avoid the overvoltage fault of the primary circuit 110 triggered by abnormal sampling, thereby avoiding the primary circuit 110 and the secondary circuit 130 from stopping working during abnormal sampling and improving the stability of the magnetic integration device 100.

[0078] For example, when the primary circuit 110 is operating and the secondary circuit 130 is also in an operating state, if the detection signal output by the sampling circuit 150 is outside the first preset range and the second detection voltage is within the preset voltage range, it indicates that the sampling of the primary circuit 110 by the sampling circuit 150 is abnormal. At this time, the first detection voltage is configured as the first preset voltage.

[0079] When the primary circuit 110 is not operating and the secondary circuit 130 is in an operating state, since the transformer 120 transmits electrical energy through electromagnetic induction, when the secondary circuit 130 is operating and the primary circuit 110 is not operating, the transformer 120 will also transmit electrical energy to the primary circuit 110 through electromagnetic induction. If the detection signal output by the sampling circuit 150 is outside the first preset range and the second detection voltage is within the preset voltage range, it indicates that the sampling of the primary circuit 110 by the sampling circuit 150 is abnormal. At this time, the first detection voltage is configured as the first preset voltage. Among them, the first preset range can be set according to actual applications, for example, set to 10% - 90%. If the first duty cycle is less than 10% or greater than 90%, it indicates that the first duty cycle is abnormal, that is, the detection signal is abnormal.

[0080] In an embodiment, the control circuit 140 is further configured to, within a first preset duration, when the first duty cycle is outside the first preset range and the second detection voltage is within the preset voltage range, configure the first detection voltage as the first preset voltage.

[0081] Among them, the first preset duration can be set according to actual applications, for example, set to 100ms, 150ms, 200ms, etc., and the present application does not limit this. In this way, it is possible to avoid misjudgment by the control circuit 140 caused by short - time voltage fluctuations.

[0082] The present application determines that the voltage sampling of the primary circuit 110 is abnormal by analyzing the voltage of the primary circuit 110 and the voltage of the secondary circuit 130, and sets the detection voltage of the primary circuit 110 to a fixed value that will not trigger an over - voltage fault, so as to avoid the over - voltage fault of the primary circuit 110 triggered by sampling abnormality, thereby preventing the primary circuit 110 and the secondary circuit 130 from stopping working during sampling abnormality and improving the stability of the magnetic integration device 100.

[0083] Refer to Figure 12 , in an embodiment, the primary circuit 110 includes a voltage conversion module 111 and a bus capacitor C0. The voltage conversion module 111 is configured to receive a first control signal with a preset duty cycle, and the first control signal is used to control the operation of the voltage conversion module 111 to form a discharge loop with the bus capacitor C0; the control method of the magnetic integration device 100 further includes: S4: When the first duty cycle is within the second preset range and the second detected voltage is within the preset voltage range, increase the duty cycle of the first control signal; the first preset range is greater than the second preset range; the duty cycle corresponding to the first preset voltage is less than the second preset range.

[0084] In this embodiment, under normal circumstances, the control circuit 140 controls the MOS transistor in the voltage conversion module 111 to conduct according to a preset duty cycle, so that the voltage of the bus capacitor C0 can be maintained within a range less than the first preset voltage. However, if one of the MOS transistors or electronic devices in the discharge circuit is open, it may cause the voltage of the bus capacitor C0 to be discharged untimely, and the voltage of the bus capacitor C0 accumulates and increases, thereby triggering an overvoltage fault in the primary circuit 110, causing the control circuit 140 to control the secondary circuit 130 to stop working according to this overvoltage fault.

[0085] Therefore, when the first duty cycle is within the second preset range and the second detected voltage is within the preset voltage range, it indicates that the voltage of the bus capacitor C0 corresponding to the first duty cycle is too high and the secondary circuit 130 is not overvoltage. At this time, the control circuit 140 increases the duty cycle of the first control signal, increases the voltage that the MOS transistor can pass through per unit time, thereby increasing the voltage discharged per unit time and reducing the voltage of the bus capacitor C0 to prevent the voltage of the bus capacitor C0 from being too high and triggering an overvoltage fault. Among them, the second preset range and the preset duty cycle can be set according to actual applications.

[0086] For example, when the voltage of the bus capacitor C0 at the time of triggering the overvoltage fault is 500V, the second preset range can be set to 75% - 90%, corresponding to the voltage of the bus capacitor C0 being greater than 430V. The preset duty cycle of the first control signal can be set to 10%, and the increased duty cycle of the first control signal can be set to 30%. When the first duty cycle is less than 75%, the control circuit 140 can control the voltage conversion module 111 to stop working to reduce energy consumption.

[0087] In the above text, the specific embodiments of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. A magnetic integration device, characterized in that, The magnetic integration device includes a primary circuit, a transformer, a secondary circuit, and a control circuit; the transformer is used to transfer voltage between the primary circuit and the secondary circuit; The control circuit is used to receive a detection signal with a first duty cycle and determine a first detection voltage of the primary circuit based on the detection signal; the control circuit is further used to obtain a second detection voltage of the secondary circuit; The control circuit is further used to configure the first detection voltage as a first preset voltage when the first duty cycle is outside a first preset range and the second detection voltage is within a preset voltage range; the duty cycle corresponding to the first preset voltage is within the first preset range.

2. The magnetic integration device according to claim 1, wherein The primary circuit includes a voltage conversion module and a bus capacitor; the bus capacitor is connected in parallel with the voltage conversion module; a first end of the voltage conversion module is used to connect to a first voltage; the voltage conversion module is used to convert the first voltage into a second voltage and output it; The control circuit is used to output a first control signal with a preset duty cycle, and the first control signal is used to control the operation of the voltage conversion module to form a discharge loop with the bus capacitor; The control circuit is further used to increase the duty cycle of the first control signal when the first duty cycle is within a second preset range and the second detection voltage is within a preset voltage range; The first preset range is greater than the second preset range; the duty cycle corresponding to the first preset voltage is less than the second preset range.

3. The magnetic integration device according to claim 2, wherein The voltage conversion module includes a power factor correction circuit and a first voltage conversion circuit; A first end of the power factor correction circuit is used to connect to the first voltage, a second end of the power factor correction circuit is electrically connected to the bus capacitor, a first end of the first voltage conversion circuit is electrically connected to the bus capacitor, and a second end of the first voltage conversion circuit is electrically connected to the primary side of the transformer; The power factor correction circuit is used to adjust the power factor of the first voltage; the first voltage conversion circuit is used to convert the first voltage output by the power factor correction circuit into the second voltage; The first control signal is used to control the operation of the first voltage conversion circuit to form a discharge loop with the bus capacitor.

4. The magnetic integration device according to claim 3, wherein, The first voltage conversion circuit includes a first switch tube, a second switch tube, a third switch tube, and a fourth switch tube; A first end of the first switch tube is electrically connected to the power factor correction circuit, a second end of the first switch tube is electrically connected to a first end of the second switch tube, and a second end of the second switch tube is electrically connected to the power factor correction circuit; a first end of the third switch tube is electrically connected to the first end of the first switch tube, a second end of the third switch tube is electrically connected to a first end of the fourth switch tube, and a second end of the fourth switch tube is electrically connected to the second end of the second switch tube; a third end of the first switch tube, a third end of the second switch tube, a third end of the third switch tube, and a third end of the fourth switch tube are respectively electrically connected to the control circuit; The first control signal is used to control the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor to be all turned on, so as to form a discharge loop with the bus capacitor.

5. The magnetic integration device according to claim 3, wherein The secondary circuit includes a second voltage conversion circuit; The second voltage conversion circuit is electrically connected to the secondary side of the transformer; the second voltage conversion circuit is used to convert the second voltage into a third voltage and output it; When the secondary circuit is in the working state, the control circuit is further used to obtain the current of the second voltage conversion circuit, and in the case where the current of the second voltage conversion circuit is greater than a preset current, control the second voltage conversion circuit to stop working.

6. The magnetic integration device according to claim 5, wherein The control circuit is further used to increase the preset current in the case where the first detection voltage is less than a second preset voltage; the second preset voltage is less than the first preset voltage.

7. The magnetic integration device according to claim 5, wherein The secondary circuit further includes a third voltage conversion circuit; The second voltage conversion circuit and the third voltage conversion circuit are respectively electrically connected to the secondary side of the transformer; The third voltage conversion circuit is used to convert the third voltage into a fourth voltage and output it; the third voltage is less than the fourth voltage.

8. A control method for a magnetic integration device, the magnetic integration device comprising a primary circuit, a transformer, and a secondary circuit; characterized in that, The method includes: Receiving a detection signal with a first duty cycle, and determining a first detection voltage of the primary circuit based on the detection signal; Obtaining a second detection voltage of the secondary circuit; If the first duty cycle is outside a first preset range and the second detection voltage is within a preset voltage range, configuring the first detection voltage as a first preset voltage; the duty cycle corresponding to the first preset voltage is within the first preset range.

9. The control method of the magnetic integration device according to claim 8, characterized in that, The primary circuit includes a voltage conversion module and a bus capacitor. The voltage conversion module is used to receive a first control signal with a preset duty cycle. The first control signal is used to control the voltage conversion module to work, so as to form a discharge loop with the bus capacitor; The control method of the magnetic integration device further includes: If the first duty cycle is within a second preset range and the second detection voltage is within a preset voltage range, increasing the duty cycle of the first control signal; The first preset range is greater than the second preset range; the duty cycle corresponding to the first preset voltage is less than the second preset range.

10. A vehicle, characterized in that, Including the magnetic integration device according to any one of claims 1 to 7.

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