Isolated DC-DC converter and charging device
By optimizing the arrangement of modules and the rational layout of components in the charging device, the problems of complex primary full-bridge circuit drive circuit and large space occupied by common-mode LC filter circuit were solved, achieving higher power density and lower device cost, and improving electromagnetic interference suppression capability.
Patent Information
- Application Number
- CN202521517761.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2035-07-21
AI Technical Summary
In existing charging devices, the MOS tube drive circuit of the primary full-bridge circuit is complex, occupying the main circuit wiring space and increasing the amount of electromagnetic interference emission. At the same time, the two-stage common-mode LC filter circuit occupies a large volume, making it difficult to increase the power density and increasing the cost.
The input module, output module, primary full-bridge module, resonant module and rectifier module are connected in sequence along the direction of cooling airflow. The power supply component and the isolation drive component are respectively arranged in different directions of the primary full-bridge module. The resonant module includes a magnetic integrated component and a resonant capacitor component to form a resonant cavity to reduce switching loss. The common-mode filter magnetic ring is connected to the secondary output end of the transformer. The anti-backflow device and the heat dissipation device are reasonably arranged to reduce wiring space and device costs.
On the basis of reducing circuit wiring space, the power density is improved, the device cost and loss are reduced, and a smaller size and higher electromagnetic interference suppression effect are achieved.
Smart Images
Figure CN223364043U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of charging, in particular to an isolated DC-DC converter and a charging device. Background Art
[0002] In existing technology, charging devices typically consist of a power factor corrector (PFC) pre-stage and an isolated DC-DC converter. The isolated DC-DC converter includes at least seven main circuit components: a DC bus capacitor, a primary full-bridge circuit, a resonant cavity circuit, a diode rectifier bridge, a series-parallel switching relay, a common-mode filter circuit, and an anti-backflow diode. To increase power density, these seven main circuit components must be tightly arranged.
[0003] However, taking the primary full-bridge circuit as an example, the MOS transistor drive circuit in the primary full-bridge circuit is complex, which takes up space in the main circuit wiring and increases the area of the main circuit commutation loop, thereby increasing electromagnetic interference emissions. To prevent electromagnetic interference output, technicians often configure a two-stage common-mode LC filter circuit on the output side. However, this two-stage common-mode LC filter circuit takes up a considerable amount of space, which is not conducive to reducing costs and improving power density.
[0004] Based on this, there is an urgent need for a new DC converter arrangement structure that can overcome the above technical problems and improve the power density of the charging module. Utility Model Content
[0005] The purpose of the present invention is to provide an isolated DC-DC converter and a charging device, which can improve power density and reduce device costs while reducing circuit wiring space.
[0006] In a first aspect, the present application provides an isolated DC-DC converter, comprising an input module, an output module, and a primary full-bridge module, a resonant module, and a rectifier module connected in sequence along a cooling airflow direction; the input module, the output module, the primary full-bridge module, the resonant module, and the rectifier module are all disposed on a PCB;
[0007] The input module includes a power supply component and an isolation drive component. The power supply component and the isolation drive component are respectively arranged in different directions of the PCB area where the primary full-bridge module is located. The power supply component is connected to the input end of the primary full-bridge module to receive an isolated DC signal. The isolation drive component is connected to the control end of the primary full-bridge module to provide a drive signal to each switch tube in the primary full-bridge module and adjust the on / off state of the corresponding switch tube.
[0008] The output module is set on the left side of the PCB area where the rectifier module is located;
[0009] The resonant module includes a magnetic integrated component and a resonant capacitor component. The input end of the resonant capacitor component is connected to the output end of the primary full-bridge module, and the output end of the resonant capacitor component is connected to the input end of the magnetic integrated component. The magnetic integrated component is used to represent an integrated structure including a transformer and a resonant inductor. The resonant capacitor component and the magnetic integrated component form a resonant cavity to reduce the switching loss of the isolated DC-DC converter.
[0010] In one possible implementation, the power supply component includes a bus interface and a DC bus capacitor, wherein the bus interface is connected to an input end of the DC bus capacitor and is configured to receive an isolated DC power signal;
[0011] Among them, the bus interface and DC bus capacitor are both set below the PCB area where the primary full-bridge module is located.
[0012] In one possible implementation, the isolation driver assembly includes an isolation driver power supply socket, which is connected to the primary side full-bridge module via a pin header;
[0013] The isolated driver power supply connector is located above the PCB area where the primary full-bridge module is located.
[0014] In a possible implementation, the magnetic integration component further includes a common-mode filter magnetic ring, which is connected to the secondary output terminal of the transformer.
[0015] In one possible implementation, the isolated DC-DC converter further includes an anti-backflow device, which includes a plurality of cascaded diodes; an output end of the anti-backflow device is connected to an input end of the output module; and an input end of the anti-backflow device is connected to an output end of the rectifier module;
[0016] The backflow prevention device is arranged below the PCB area where the output module is located.
[0017] In one possible implementation, the isolated DC-DC converter also includes a heat dissipation device, which includes a first heat dissipation component, a second heat dissipation component and a third heat dissipation component. The first heat dissipation component cover is arranged on the surface of the anti-backflow device; the second heat dissipation component cover is arranged on the surface of the rectifier module; and the third heat dissipation component cover is arranged on the surface of the primary full-bridge module.
[0018] In one possible implementation, the output module includes a quick-connect terminal and a capacitor assembly; the isolated DC-DC converter also includes a common-mode filter inductor assembly and an output filter assembly; the input end of the output filter assembly is connected to the output end of the rectifier module; the output end of the output filter assembly is sequentially connected to the common-mode filter inductor assembly, the backflow prevention device, the capacitor assembly, and the quick-connect terminal to form a common-mode filter circuit;
[0019] The output filter component is arranged below the PCB area where the rectifier module is located.
[0020] In one possible implementation, the isolated DC-DC converter also includes a control module, which is arranged on the left side of the PCB area where the isolation drive component is located; the control module is connected to the control end of the isolation drive component, and is used to send a first control signal to the isolation drive component to drive the isolation drive component to switch the conduction and disconnection states of each switch tube under the primary full-bridge module.
[0021] In one possible implementation, the isolated DC-DC converter further includes a series-parallel relay module, which is disposed on the left side of the PCB area where the output filter component is located; the control module is connected to a control terminal of the series-parallel relay module, and the series-parallel relay module is further connected to the rectifier module;
[0022] The control module is further configured to send a second control signal to the series-parallel relay module to drive the series-parallel relay module to adjust the on-off state of the diode in the rectifier module to change the voltage range of the isolated DC-DC converter.
[0023] In a second aspect, the present application further provides a charging device, comprising the isolated DC-DC converter provided in the first aspect above.
[0024] The isolated DC-DC converter and charging device provided by the utility model have the following beneficial effects:
[0025] The present application provides an isolated DC-DC converter, comprising an input module, an output module, and a primary full-bridge module, a resonant module, and a rectifier module connected in sequence along the direction of the cooling airflow; the input module, the output module, the primary full-bridge module, the resonant module, and the rectifier module are all arranged on a PCB; the input module includes a power supply component and an isolation drive component; the power supply component and the isolation drive component are respectively arranged in different directions of the PCB area where the primary full-bridge module is located; the power supply component is used to receive isolated DC signals; and the isolation drive component provides drive signals for each switch tube in the primary full-bridge module. The output module is arranged around the rectifier module. The resonant module includes a magnetic integrated component and a resonant capacitor component, and the magnetic integrated component is used to represent an integrated structure including a transformer and a resonant inductor; wherein the resonant capacitor component and the magnetic integrated component constitute a resonant cavity, which is used to reduce the switching loss of the isolated DC-DC converter. Based on this, the present application provides an isolated DC-DC converter and a charging device, which can improve power density and reduce device costs while reducing circuit wiring space. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0027] Figure 1 This is one of the structural diagrams of the isolated DC-DC converter in the embodiment of the present utility model;
[0028] Figure 2 This is a structural diagram of the magnetic integrated component in an embodiment of the present utility model;
[0029] Figure 3 This is a partial circuit schematic diagram of the primary side full-bridge module in an embodiment of the present utility model;
[0030] Figure 4 This is the second structural diagram of the isolated DC-DC converter in the embodiment of the present utility model;
[0031] Figure 5 This is the third structural diagram of the isolated DC-DC converter in the embodiment of the present utility model;
[0032] Figure 6 This is the fourth structural diagram of the isolated DC-DC converter in the embodiment of the present utility model;
[0033] Figure 7 This is the fifth structural diagram of the isolated DC-DC converter in the embodiment of the present utility model;
[0034] Figure 8 This is a schematic structural diagram of a heat dissipation device in an embodiment of the present utility model;
[0035] Figure 9 This is the sixth structural diagram of the isolated DC-DC converter in the embodiment of the present utility model;
[0036] Figure 10 This is the seventh structural diagram of the isolated DC-DC converter in the embodiment of the present utility model;
[0037] Figure 11 This is a PCB structure diagram of the isolated DC-DC converter in an embodiment of the present utility model.
[0038] Icons: 10-Isolated DC-DC Converter; 20-PCB; 101-Input Module; 102-Output Module; 103-Primary Full-Bridge Module; 104-Resonant Module; 105-Rectifier Module; 106-Backflow Prevention Device; 107-control module; 108-common-mode filter inductor assembly; 109-output filter assembly; 110-heat dissipation device; 111-series-parallel relay module; 201-power supply assembly; 202-isolation drive assembly; 203-magnetic integration assembly; 204-resonant capacitor assembly; 205-bus interface; 206-DC bus capacitor; 207-isolation drive power supply socket; 208-quick-plug terminal; 209-capacitor assembly; 210-film capacitor; 211-auxiliary power supply; 301-first heat dissipation assembly; 302-second heat dissipation assembly; 303-third heat dissipation assembly; Q1-first switch tube; Q2-second switch tube; C1-first capacitor; C2-second capacitor; C3-third capacitor; C4-fourth capacitor. DETAILED DESCRIPTION
[0039] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.
[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0042] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and should not be construed as indicating or implying relative importance.
[0043] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.
[0044] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.
[0045] Please refer to Figure 1 , Figure 1 A schematic structural diagram of the isolated DC-DC converter in this embodiment is shown; the isolated DC-DC converter 10 in this embodiment includes an input module 101, an output module 102, and a primary full-bridge module 103, a resonant module 104, and a rectifier module 105 connected in sequence along the direction of the cooling air flow; the input module 101, the output module 102, the primary full-bridge module 103, the resonant module 104, and the rectifier module 105 are all arranged on a PCB 20.
[0046] Among them, the input module 101 includes a power supply component 201 and an isolation drive component 202; the power supply component 201 and the isolation drive component 202 are arranged in different directions of the PCB area where the primary full-bridge module 103 is located; the power supply component 201 is connected to the input end of the primary full-bridge module 103 for receiving an isolated DC power signal; the isolation drive component 202 is connected to the control end of the primary full-bridge module 103 to provide a drive signal for each switch tube under the primary full-bridge module 103 to drive the loop of the resonant module 104 to work and transmit energy to the rectifier module 105.
[0047] The output module 102 is disposed on the left side of the PCB area where the rectifier module 105 is located.
[0048] The resonant module 104 includes a magnetic integrated component 203 and a resonant capacitor component 204. The magnetic integrated component 203 represents an integrated structure including a transformer and a resonant inductor. The resonant capacitor component 204 and the magnetic integrated component 203 form a resonant cavity to reduce switching losses of the isolated DC-DC converter 10.
[0049] Specifically, in this embodiment, the magnetic integrated component 203 is an integrated module that integrates a transformer and a resonant inductor, and is disposed near the PCB area where the resonant capacitor component 204 is located.
[0050] Please continue to refer to Figure 1 In this embodiment, the input end of the resonant capacitor component 204 is connected to the output end of the primary full-bridge module 103, and the output end of the resonant capacitor component 204 is connected to the input end of the magnetic integrated component 203. At the same time, the resonant capacitor component 204 is arranged on the right side of the PCB area where the magnetic integrated component 203 is located, and is located on the left side of the PCB area where the primary full-bridge module 103 is located.
[0051] In one possible implementation, the resonant capacitor component 204 includes multiple capacitors with a specification of 22uF / 1.6kV, wherein 10 capacitors with the above specifications are set on each phase of the circuit, and the capacitors are set in parallel to form the resonant capacitor component 204 described in this embodiment.
[0052] Based on this, the resonance module 104 can realize electrical isolation and power conversion based on the resonance cavity while forming resonance, optimizing the current peak and realizing soft switching.
[0053] In summary, the present application not only saves the layout space of the isolated DC-DC converter 10 by setting the input module 101, the output module 102, the primary full-bridge module 103, the resonant module 104, the rectifier module 105 and the arrangement positions of their respective modules, but also can reduce the size of the isolated DC-DC converter 10 on the basis of realizing the conversion function of the isolated DC-DC converter 10, reduce the circuit wiring space, improve the power density, reduce the device cost, and reduce the device loss.
[0054] In order to improve the common mode filtering function of the above-mentioned isolated DC-DC converter 10, reference is made to Figure 2 , Figure 2 A schematic diagram (side view) of the magnetic integrated assembly in this embodiment is shown. This embodiment also includes a common-mode filter magnetic ring connected to the secondary output terminal of the transformer. Based on this, the isolated DC-DC converter 10 provided in this application can achieve good common-mode filtering using only a single-stage filtering solution, while simultaneously reducing the layout space required for the common-mode filter circuit.
[0055] Furthermore, in order to enable the above-mentioned first-stage filtering solution to effectively reduce electromagnetic interference to below the standard index, in this embodiment, a high-voltage ceramic capacitor can be set between the drain and source of each switch tube under the primary full-bridge module 103. Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the primary full-bridge module in this embodiment is shown. It should be noted that the diagram only shows the structural relationship between any two switch tubes (the first switch tube Q1 and the second switch tube Q2), and does not limit the number of switch tubes in the primary full-bridge module.
[0056] Please continue to refer to Figure 3In this embodiment, the primary full-bridge module 103 includes at least a first switch tube Q1, a second switch tube Q2, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The drain of the first switch tube Q1 is connected to the drain of the second switch tube Q2, the first end of the first capacitor C1, and the first end of the second capacitor C2. The second end of the first capacitor C1 is connected to the second end of the second capacitor C2 and the first end of the third capacitor C3. The second end of the second capacitor C2 is also connected to the first end of the fourth capacitor C4. The control ends of the first switch tube Q1 and the second switch tube Q2 are used to receive the drive signal sent by the isolation drive component 202 and then adjust their own on-off states according to the drive signal.
[0057] In this embodiment, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are all high-voltage ceramic capacitors of the second switch tube Q2. Through the corresponding connection method, the voltage and current change rates of the corresponding switch tubes in the primary full-bridge module 103 at the time of operation can be greatly reduced, thereby reducing the demand for common-mode filtering on the output side, and then the electromagnetic interference can be effectively reduced to below the standard index through the first-level common-mode filtering.
[0058] In one possible implementation, the capacitance of the high-voltage ceramic capacitor may be 1.5 nF.
[0059] refer to Figure 4 , Figure 4 Another schematic diagram of the isolated DC-DC converter in this embodiment is shown. In this embodiment, the power supply assembly 201 includes a bus interface 205 and a DC bus capacitor 206. The bus interface 205 is connected to the input of the DC bus capacitor 206 to receive an isolated DC signal. The output of the DC bus capacitor 206 is connected to the input of the primary full-bridge module 103.
[0060] The bus interface 205 and the DC bus capacitor 206 are both arranged below the PCB area where the primary full-bridge module 103 is located; and the bus interface 205 is arranged on the right side of the PCB area where the DC bus capacitor 206 is located.
[0061] Based on this, this embodiment can place the switching tube under the primary full-bridge module 103 close to the bus interface 205 and the DC bus capacitor 206 by setting the bus interface 205 and the DC bus capacitor 206 below the PCB area where the primary full-bridge module 103 is located, thereby ensuring the integrity of the input isolation current by drawing power nearby.
[0062] In one possible implementation, reference Figure 5 , Figure 5Another structural diagram of the isolated DC-DC converter in this embodiment is shown; wherein, the isolated drive component 202 includes an isolated drive power supply socket 207, and the isolated drive power supply socket 207 is connected to the primary side full-bridge module 103 through a pin header.
[0063] The isolated driver power supply socket 207 is disposed above the PCB area where the primary full-bridge module 103 is located.
[0064] Please continue to refer to Figure 5 In this embodiment, the isolation drive component 202 also includes an auxiliary power supply 211, which is connected to the power supply end of the isolation drive power supply socket 207 and is used to power the isolation drive power supply socket 207, thereby driving the primary side full-bridge module 103 based on the control signal of the control module 107.
[0065] The auxiliary power supply 211 and the isolation driver power supply socket 207 are arranged on the same side of the PCB area where the primary full-bridge module 103 is located.
[0066] It should be noted that the output voltage of the auxiliary power supply 211 is not limited in this embodiment, as long as it can meet the power supply requirements of components such as the isolated driver power supply socket 207. In one possible implementation, the auxiliary power supply 211 can output at least two different voltages to meet the power supply requirements of corresponding components in the isolated DC-DC converter.
[0067] Based on this, the isolated driver power supply connector 207 in this embodiment, through its isolated drive and independent board design, saves wiring space for the primary full-bridge module 103, reduces the commutation loop area, and reduces device losses and electromagnetic interference. Furthermore, by being located near the PCB area where the primary full-bridge module 103 resides, the reliability of the driver power supply is ensured.
[0068] In one possible implementation, reference Figure 6 , Figure 6 Another structural schematic diagram of the isolated DC-DC converter in this embodiment is shown; wherein, the isolated DC-DC converter 10 also includes an anti-backflow device 106, and the anti-backflow device 106 includes a plurality of cascaded diodes; the output end of the anti-backflow device 106 is connected to the input end of the output module 102; the input end of the anti-backflow device 106 is connected to the output end of the rectifier module 105.
[0069] Please Figure 6 Based on the reference Figure 7 , Figure 7Another structural schematic diagram of the isolated DC-DC converter in this embodiment is shown. The output module 102 includes a quick-connect terminal 208 and a capacitor assembly 209. The isolated DC-DC converter 10 also includes a common-mode filter inductor assembly 108 and an output filter assembly 109. The input end of the output filter assembly 109 is connected to the output end of the rectifier module 105. The output end of the output filter assembly 109 is sequentially connected to the common-mode filter inductor assembly 108, the backflow prevention device 106, the capacitor assembly 209, and the quick-connect terminal 208 to form a common-mode filter circuit.
[0070] The output filter assembly 109 is disposed below the PCB area where the rectifier module 105 is located. The backflow prevention device 106 is disposed below the PCB area where the output module 102 is located. The common-mode filter inductor assembly 108 is disposed below the PCB area where the backflow prevention device 106 is located.
[0071] It should be noted that this embodiment does not limit the structures of the capacitor component 209, common-mode filter inductor component 108, and output filter component 109. In one possible implementation, the capacitor component 209 in this embodiment may include an X capacitor and a Y capacitor arranged in cascade. Correspondingly, the common-mode filter inductor component 108 may include a common-mode filter inductor and corresponding upstream and downstream capacitors, such as an X capacitor and a Y capacitor.
[0072] To reduce device power consumption and improve device heat dissipation performance, please refer to Figure 8 , Figure 8 A schematic diagram of the heat dissipation device in this embodiment is shown. In this embodiment, the isolated DC-DC converter 10 further includes a heat dissipation device 110. The heat dissipation device 110 includes a first heat dissipation component 301, a second heat dissipation component 302, and a third heat dissipation component 303. The first heat dissipation component 301 is disposed on the surface of the backflow prevention device 106; the second heat dissipation component 302 is disposed on the surface of the rectifier module 105; and the third heat dissipation component 303 is disposed on the surface of the primary full-bridge module 103. In one possible implementation, the size of the heat dissipation component is greater than or equal to the size of the corresponding module. Taking the first heat dissipation component 301 and the backflow prevention device 106 as an example, the size of the first heat dissipation component 301 is greater than or equal to the size of the backflow prevention device 106.
[0073] In this embodiment, an independent heat sink can be provided for the high-power module, which can reduce device costs and facilitate assembly.
[0074] Please refer to Figure 9 , Figure 9Another structural schematic diagram of the isolated DC-DC converter in this embodiment is shown. In this embodiment, the isolated DC-DC converter 10 further includes a control module 107, which is arranged on the left side of the PCB area where the isolation drive component 202 is located; the control module 107 is connected to the control end of the isolation drive component 202, and is used to send a first control signal to the isolation drive component 202 to drive the isolation drive component 202 to switch the conduction state of each switch tube under the primary full-bridge module 103.
[0075] In one possible implementation, the control module 107 includes a control board interface and a control board. The control board interface connects to the control board via a 2.54 mm pitch pin header, saving space while improving the control system's anti-interference performance. In this embodiment, the control board interface is also connected to the output module 102. Based on this, the control board can obtain current sampling signals, voltage sampling signals, and other signals from the output circuit of the output module 102 to facilitate accurate closed-loop control.
[0076] It should be noted that this embodiment does not limit the method for the control board to implement closed-loop control after acquiring signals such as current sampling signals and voltage sampling signals.
[0077] In one possible implementation, please refer to Figure 9 In this embodiment, the voltage and current sampling signals are sampled from the common-mode filter circuit and the output filter capacitor, respectively, and then transmitted to the pins on the left side of the control board interface for acquisition by the control board. Similarly, the drive signal can be output from the pins on the right side of the control board interface and routed from the outside of the primary full-bridge module 103, along the edge of the PCB area where the primary full-bridge module 103 is located, to connect to the primary full-bridge module 103 to adjust the on / off state of each switch.
[0078] In this embodiment, the closer the sampling position of the current sampling signal is to the output port of the output module 102, the more accurate the corresponding current sampling result; the closer the sampling position of the voltage sampling signal is to the rectifier module 105, the stronger the EMC capability of the control module 107 for the output port of the output module 102.
[0079] Please refer to Figure 10 , Figure 10 Another structural schematic diagram of the isolated DC-DC converter in this embodiment is shown. The isolated DC-DC converter 10 further includes a series-parallel relay module 111, which is disposed to the left of the PCB area where the output filter component 109 is located. The control module 107 is connected to a control terminal of the series-parallel relay module 111, and the series-parallel relay module 111 is also connected to a control terminal of the rectifier module 105.
[0080] The control module 107 is further configured to send a second control signal to the series-parallel relay module 111 to drive the series-parallel relay module 111 to adjust the on / off state of the diode in the rectifier module 105 to change the voltage range of the isolated DC-DC converter 10 .
[0081] This embodiment can adjust the working state of the rectifier module 105. For example, the corresponding rectifier outputs of the two windings of each phase are switched in series or parallel to expand the output voltage range of the charging device, coordinate the current stress, and achieve a full power output capability of 300V~1000V.
[0082] Please refer to Figure 11 , Figure 11 A schematic diagram of the PCB structure of the isolated DC-DC converter in this embodiment is shown. In one possible implementation, this embodiment may further provide a thin film capacitor 210 between the PCB area where the primary full-bridge module 103 is located and the PCB area where the isolated driver power supply socket 207 is located. The thin film capacitor 210 is an X capacitor on the DC bus and can absorb high-frequency interference.
[0083] Based on this, this embodiment can improve power density and reduce device costs while reducing circuit wiring space.
[0084] With the same idea as the previous embodiment, the present application further provides a charging device, comprising the isolated DC-DC converter described in the first aspect above.
[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An isolated DC-DC converter, characterized in that: It includes an input module, an output module, and a primary full-bridge module, a resonance module, and a rectifier module connected in sequence along the cooling airflow direction; the input module, the output module, the primary full-bridge module, the resonance module, and the rectifier module are all arranged on a PCB; The input module includes a power supply component and an isolation drive component; the power supply component and the isolation drive component are respectively arranged in different directions of the PCB area where the primary full-bridge module is located; the power supply component is connected to the input end of the primary full-bridge module for receiving an isolated DC power signal; the isolation drive component is connected to the control end of the primary full-bridge module for providing a drive signal to each switch tube in the primary full-bridge module to adjust the on / off state of the corresponding switch tube; The output module is arranged on the left side of the PCB area where the rectifier module is located; The resonant module includes a magnetic integrated component and a resonant capacitor component; the input end of the resonant capacitor component is connected to the output end of the primary full-bridge module, and the output end of the resonant capacitor component is connected to the input end of the magnetic integrated component; wherein the magnetic integrated component is used to represent an integrated structure including a transformer and a resonant inductor; the resonant capacitor component and the magnetic integrated component constitute a resonant cavity to reduce the switching loss of the isolated DC-DC converter.
2. The isolated DC-DC converter according to claim 1, characterized in that: The power supply component includes a bus interface and a DC bus capacitor, wherein the bus interface is connected to the input end of the DC bus capacitor and is used to receive an isolated DC signal; The bus interface and the DC bus capacitor are both arranged below the PCB area where the primary full-bridge module is located.
3. The isolated DC-DC converter according to claim 1, wherein: The isolation drive component includes an isolation drive power supply socket, and the isolation drive power supply socket is connected to the primary side full-bridge module through a pin header; The isolation driver power supply socket is arranged above the PCB area where the primary full-bridge module is located.
4. The isolated DC-DC converter according to claim 1, wherein: The magnetic integration component further includes a common-mode filter magnetic ring, which is connected to the secondary output end of the transformer.
5. The isolated DC-DC converter according to claim 1, wherein: The isolated DC-DC converter further includes an anti-backflow device, which includes a plurality of cascaded diodes; the output end of the anti-backflow device is connected to the input end of the output module; the input end of the anti-backflow device is connected to the output end of the rectifier module; Wherein, the anti-backflow device is arranged below the PCB area where the output module is located.
6. The isolated DC-DC converter according to claim 5, characterized in that: The isolated DC-DC converter also includes a heat dissipation device, which includes a first heat dissipation component, a second heat dissipation component and a third heat dissipation component. The first heat dissipation component cover is arranged on the surface of the anti-backflow device; the second heat dissipation component cover is arranged on the surface of the rectifier module; and the third heat dissipation component cover is arranged on the surface of the primary full-bridge module.
7. The isolated DC-DC converter according to claim 5, characterized in that: The output module includes a quick-connect terminal and a capacitor assembly; the isolated DC-DC converter also includes a common-mode filter inductor assembly and an output filter assembly; the input end of the output filter assembly is connected to the output end of the rectifier module; the output end of the output filter assembly is sequentially connected to the common-mode filter inductor assembly, the backflow prevention device, the capacitor assembly, and the quick-connect terminal to form a common-mode filter circuit; The output filter component is arranged below the PCB area where the rectifier module is located.
8. The isolated DC-DC converter according to claim 7, characterized in that: The isolated DC-DC converter also includes a control module, which is arranged on the left side of the PCB area where the isolated drive component is located; the control module is connected to the control end of the isolated drive component and is used to send a first control signal to the isolated drive component to drive the isolated drive component to switch the conduction and disconnection states of each switch tube under the primary full-bridge module.
9. The isolated DC-DC converter according to claim 8, characterized in that: The isolated DC-DC converter further includes a series-parallel relay module, which is arranged on the left side of the PCB area where the output filter component is located; the control module is connected to the control end of the series-parallel relay module, and the series-parallel relay module is also connected to the rectifier module; The control module is further configured to send a second control signal to the series-parallel relay module to drive the series-parallel relay module to adjust the on-off state of the diode in the rectifier module to change the voltage range of the isolated DC-DC converter.
10. A charging device, characterized in that: The isolated DC-DC converter comprises the isolated DC-DC converter according to any one of claims 1 to 9.