Voltage conversion device, DC-DC converter and vehicle

Abstract

The utility model discloses a voltage conversion device, a DC-DC converter and a vehicle. The voltage conversion device firstly converts high-voltage direct current output by a power supply into high-voltage alternating current through an input module; the converted high-voltage alternating current is subjected to different-degree voltage reduction through a voltage reduction module, and a plurality of low-voltage alternating currents subjected to different-degree voltage reduction are output; and finally, the plurality of low-voltage alternating currents are converted into low-voltage direct currents with different voltage values through the output module. Therefore, a vehicle only needs to be equipped with the voltage conversion device, high-voltage direct current output by a power supply such as a power battery can be converted into multiple paths of low-voltage direct current with different voltage values, and the low-voltage direct current is correspondingly supplied to different electric appliances of the vehicle, so that the problem that the vehicle needs to carry a plurality of direct current-direct current converters to supply power to the different electric appliances is solved; therefore, the voltage conversion device not only can effectively reduce the vehicle weight and avoid occupying extra vehicle space, but also can effectively reduce the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a voltage conversion device, a DC-DC converter and a vehicle. Background Art

[0002] The power battery is a key component of the vehicle. Its output voltage is typically 100V to 400V or even 800V, which cannot be directly used by the vehicle's electrical appliances. Therefore, a step-down DC / DC converter is needed to convert the high-voltage DC power into a constant low-voltage DC power to power 12V, 24V or 48V systems, including lighting, power windows, wipers, defrosters, instrument systems, entertainment systems, battery management systems, driving controls, power seats, speakers and other electrical appliances or to charge the battery.

[0003] Because different electrical appliances in a vehicle may require different input voltages, the vehicle needs to be equipped with multiple DC / DC converters to convert the high-voltage DC power of the power battery into different low-voltage DC power for use by different electrical appliances in the vehicle or to charge the battery. However, installing multiple DC / DC converters on a vehicle not only increases vehicle weight and occupies additional vehicle space, but also increases costs. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, one purpose of the present invention is to propose a voltage conversion device, which can convert high-voltage direct current into multiple low-voltage direct currents with different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. This can not only effectively reduce the weight of the vehicle and avoid additional space occupation in the vehicle, but also effectively reduce costs.

[0006] Therefore, a second object of the present invention is to provide a DC-DC converter.

[0007] Therefore, the third object of the present invention is to provide a vehicle.

[0008] To achieve the above-mentioned objectives, the first aspect of the present invention discloses a voltage conversion device, comprising: an input module, the input module being connected to a power supply, the input module being used to convert the high-voltage direct current output by the power supply into high-voltage alternating current; a step-down module, the step-down module being connected to the input module, the step-down module being used to step down the high-voltage alternating current to different degrees, and correspondingly outputting a plurality of low-voltage alternating currents with different voltage values; an output module, the output module being connected to the step-down module, the output module being used to convert the low-voltage alternating currents with a plurality of different voltage values ​​into low-voltage direct currents respectively.

[0009] According to the voltage conversion device of the present invention, the high-voltage direct current output by the power supply is first converted into high-voltage alternating current through the input module; the converted high-voltage alternating current is then stepped down to different degrees through the step-down module, and multiple low-voltage alternating currents after being stepped down to different degrees are output; finally, the multiple low-voltage alternating currents are respectively converted into low-voltage direct currents with different voltage values ​​through the output module; thus, the vehicle only needs to be equipped with one such voltage conversion device to convert the high-voltage direct current output by a power supply such as a power battery into multiple low-voltage direct currents with different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid occupying additional vehicle space, but also effectively reduce costs.

[0010] In addition, the DC-DC converter of the present invention may also have the following additional technical features:

[0011] In some examples, the input module includes a first phase bridge circuit, which includes: two first phase bridge arms connected in parallel, one end of each first phase bridge arm is connected to the positive pole of the power supply, and the other end of each first phase bridge arm is connected to the negative pole of the power supply, and each first phase bridge arm includes two first switching tubes connected in series.

[0012] In some examples, the step-down module includes multiple step-down circuits, which are connected in series. One end of the multiple step-down circuits connected in series is connected to one first-phase bridge arm, and the other end of the multiple step-down circuits connected in series is connected to another first-phase bridge arm. Each step-down circuit steps down the high-voltage alternating current to a different degree to output low-voltage alternating current with different voltage values.

[0013] In some examples, each of the step-down circuits includes: a transformer, the primary coils of the transformers of multiple step-down circuits are connected in series, one end of the primary coils of the multiple transformers connected in series is connected to one first-phase bridge arm, the other end of the primary coils of the multiple transformers connected in series is connected to another first-phase bridge arm, and the secondary coil of the transformer is connected to the output module; wherein the winding ratio of the transformer in each step-down circuit is different.

[0014] In some examples, the output module includes multiple second-phase bridge circuits, which are connected one-to-one to multiple step-down circuits, and the multiple second-phase bridge circuits are used to convert the low-voltage alternating currents of multiple different voltage values ​​into low-voltage direct currents one-to-one.

[0015] In some examples, each second-phase bridge circuit includes: a second-phase bridge arm, wherein the two ends of the second-phase bridge arm are respectively connected to the two ends of the secondary coil of the corresponding connected transformer, and the second-phase bridge arm includes two second switching tubes connected in series; an output unit, wherein one end of the output unit is connected to the two second switching tubes of the second-phase bridge arm, and the other end of the output unit is connected to the corresponding secondary coil of the transformer, and the output unit is used to output corresponding low-voltage direct current.

[0016] In some examples, the input module further includes a first filtering circuit, which is connected to the power supply and configured to filter the high-voltage direct current.

[0017] In some examples, the first filtering circuit includes: a first capacitor, one end of which is connected to the positive electrode of the power supply, and the other end of which is connected to the negative electrode of the power supply; a first inductor, one end of which is connected to one of the first phase bridge arms, and the other end of which is connected to one end of the primary coils of the multiple transformers connected in series.

[0018] In some examples, each second-phase bridge circuit further includes a second filtering circuit connected to the output unit, and the second filtering circuit is configured to filter the low-voltage direct current.

[0019] In some examples, the second filtering circuit includes: a second capacitor, one end of the second capacitor is connected to one end of the output unit, and the other end of the second capacitor is connected to the other end of the output unit; a second inductor, one end of the second inductor is connected to one end of the output unit, and the other end of the second inductor is connected to the secondary coil of the corresponding transformer.

[0020] To achieve the above-mentioned object, the second aspect of the present invention discloses a DC-DC converter, comprising the voltage conversion device described in the first aspect of the present invention.

[0021] According to the DC-DC converter of the present invention, its voltage conversion device first converts the high-voltage DC power output by the power supply into high-voltage AC power through the input module; then the converted high-voltage AC power is reduced to different degrees through the step-down module, and multiple low-voltage AC power after being reduced to different degrees is output; finally, the multiple low-voltage AC power is converted into low-voltage DC power of different voltage values ​​through the output module; thus, the vehicle only needs to be equipped with one such voltage conversion device to convert the high-voltage DC power output by a power source such as a power battery into multiple low-voltage DC power of different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid additional occupation of vehicle space, but also effectively reduce costs.

[0022] To achieve the above-mentioned object, the third aspect of the present invention discloses a vehicle, comprising the voltage conversion device described in the first aspect of the present invention or the DC-DC converter described in the second aspect of the present invention.

[0023] According to the vehicle of the present invention, its voltage conversion device first converts the high-voltage direct current output by the power supply into high-voltage alternating current through the input module; then reduces the converted high-voltage alternating current to different degrees through the step-down module, and outputs multiple low-voltage alternating currents after being reduced to different degrees; finally, the multiple low-voltage alternating currents are respectively converted into low-voltage direct currents with different voltage values ​​through the output module; thus, the vehicle only needs to be equipped with one such voltage conversion device to convert the high-voltage direct current output by a power supply such as a power battery into multiple low-voltage direct currents with different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid occupying additional vehicle space, but also effectively reduce costs.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 1 is a schematic structural diagram of a voltage conversion device according to an embodiment of the present utility model;

[0027] Figure 2 is a detailed circuit diagram of a voltage conversion device according to an embodiment of the present utility model;

[0028] Figure 3 It is a detailed circuit diagram of a voltage conversion device according to a specific embodiment of the utility model.

[0029] Reference numerals:

[0030] Voltage conversion device 100; input module 110; step-down module 120; output module 130; power supply HV_IN; output unit LV_OUT; battery V; electrical appliance R; first switch D1; second switch D2; first inductor L1; second inductor L2; first capacitor C1; second capacitor C2. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0032] Reference below Figure 1-Figure 3 A voltage conversion device, a DC-DC converter, and a vehicle according to embodiments of the present invention are described.

[0033] Figure 1 FIG. 1 is a schematic diagram of a voltage conversion device according to an embodiment of the present invention. The voltage conversion device can be applied to DC-DC converters and vehicles, for example. Figure 1 As shown, the voltage conversion device 100 includes an input module 110 , a voltage reduction module 120 and an output module 130 .

[0034] The input module 110 is connected to the power supply, and is used to convert the high-voltage direct current output by the power supply into high-voltage alternating current.

[0035] The step-down module 120 is connected to the input module 110 . The step-down module 120 is used to step down the high-voltage alternating current to different degrees, and accordingly output a plurality of low-voltage alternating currents with different voltage values.

[0036] The output module 130 is connected to the step-down module 120 , and is used to convert low-voltage alternating currents of multiple different voltage values ​​into low-voltage direct currents.

[0037] First, the input module 110 and the output module 130 are electrically isolated by the step-down module 120. Electrical isolation is the process of isolating the power supply from the power-consuming circuit. This isolates the low-voltage branch circuit from the entire high-voltage electrical system, creating an electrically isolated, independent, and safe system. This prevents the risk of indirect electric shock in the event of a faulty exposed conductor. By isolating the input module 110 and the output module 130 by the step-down module 120, there is no direct electrical connection between the two circuits, ensuring that they are insulated from each other while also maintaining energy transfer between them. The primary function of electrical isolation is to reduce mutual interference and noise between the two circuits.

[0038] Specifically, the voltage conversion device 100 includes three functional modules. The input module 110 is an inverter circuit that converts the high-voltage direct current output of the power supply into high-voltage alternating current; the step-down module 120 is a step-down circuit that reduces the voltage of the high-voltage alternating current to different degrees and outputs multiple low-voltage alternating currents after being reduced to different degrees; the output module 130 is a rectifier circuit that converts multiple low-voltage alternating currents into low-voltage direct currents of different voltage values.

[0039] Specifically, the power source may be a vehicle power battery, which has a relatively high output voltage, typically 100V to 400V or even 800V, and cannot be directly used by electrical appliances in the vehicle. The input module 110 is first used to convert the high-voltage direct current output by the power source into high-voltage alternating current. The step-down module 120 is then used to step down the high-voltage alternating current to varying degrees, outputting multiple low-voltage alternating currents after varying degrees of step-down. Finally, the output module 130 is used as a rectifier circuit to convert the multiple low-voltage alternating currents into low-voltage direct currents of different voltage values. Thus, the vehicle can use only one voltage conversion device 100 to convert the high-voltage direct current output by the vehicle power battery into a constant low-voltage direct current through multiple outputs, such as 14V, 28V, or 56V low-voltage direct current, to power 12V, 24V, or 48V systems, including lighting, power windows, wipers, defrosters, instrument systems, entertainment systems, battery management systems, driving controls, power seats, speakers, and other electrical appliances, or to charge the battery.

[0040] Therefore, the voltage conversion device 100 first converts the high-voltage direct current output by the power supply into high-voltage alternating current through the input module 110; then the converted high-voltage alternating current is subjected to different degrees of voltage reduction through the step-down module 120, and multiple low-voltage alternating currents after being reduced to different degrees are output; finally, the multiple low-voltage alternating currents are respectively converted into low-voltage direct currents with different voltage values ​​through the output module 130; thus, the vehicle only needs to be equipped with one such voltage conversion device 100 to convert the high-voltage direct current output by a power supply such as a power battery into multiple low-voltage direct currents with different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid occupying additional vehicle space, but also effectively reduce costs.

[0041] Figure 2 Detailed circuit diagram of a voltage conversion device according to an embodiment of the present invention. In an embodiment of the present invention, Figure 2 As shown, the input module 110 includes a first-phase bridge circuit, which includes: two first-phase bridge arms connected in parallel, one end of each first-phase bridge arm is connected to the positive pole of the power supply HV_IN, and the other end of each first-phase bridge arm is connected to the negative pole of the power supply HV_IN, and each first-phase bridge arm includes two first switching tubes D1 connected in series.

[0042] Specifically, the input module 110 adopts a full-bridge circuit. The full-bridge switching power supply has higher power output and better stability, and is usually used in ultra-high power switching power supply circuits above 1KW.

[0043] Specifically, the input module 110 includes a first-phase bridge circuit, which includes: two first-phase bridge arms connected in parallel, one end of each first-phase bridge arm is connected to the positive pole of the power supply HV_IN, and the other end is connected to the negative pole of the power supply HV_IN, each first-phase bridge arm includes two first switching tubes D1 connected in series, and the first switching tube D1 can be a MOSFET tube. The controller modulates the PWM wave with a specific duty cycle to drive the four MOSFET tubes to open and close in a predetermined order and time, thereby realizing the current inversion process, modulating the input current into a pulsed rectangular wave, and converting the high-voltage direct current into high-voltage alternating current.

[0044] In one embodiment of the present invention, Figure 2 As shown, the step-down module 120 includes multiple step-down circuits, which are connected in series. One end of the multiple step-down circuits connected in series is connected to a first-phase bridge arm, and the other end of the multiple step-down circuits connected in series is connected to another first-phase bridge arm. Each step-down circuit steps down the high-voltage alternating current to a different extent to output low-voltage alternating current with different voltage values.

[0045] Specifically, the step-down module 120 steps down the high-voltage AC power converted by the input module 110 through multiple step-down circuits connected in series. Since the degree of step-down of each step-down circuit is different, the step-down module 120 can output multiple low-voltage AC power with different degrees of step-down through multiple step-down circuits.

[0046] In one embodiment of the present invention, Figure 2 As shown, the step-down circuit includes: a transformer T, the primary coils of the transformers T of multiple step-down circuits are connected in series, one end of the primary coils of the multiple transformers T connected in series is connected to a first-phase bridge arm, the other end of the primary coils of the multiple transformers T connected in series is connected to another first-phase bridge arm, and the secondary coil of the transformer T is connected to the output module; wherein the winding ratio of the transformer T in each step-down circuit is different.

[0047] Specifically, the step-down circuit uses a transformer to achieve electrical isolation. The windings in the transformer completely isolate the input power supply from the output load, avoiding the transmission of electrical interference. Under the control of a regulating device such as a MOSFET tube, the transformer input is a pulsed rectangular wave obtained by inversion of a full-bridge circuit. The input voltage passes through the winding of the transformer and is converted into an output voltage through electromagnetic induction. It is transmitted to the secondary side of the transformer, and the result is an AC sine wave of another voltage amplitude.

[0048] Specifically, the step-down module 120 is connected through multiple step-down circuits in series, and the step-down circuit includes: a transformer T, the primary coils of the transformers T of the multiple step-down circuits are connected in series, one end of the primary coils of the multiple transformers T after being connected in series is connected to a first-phase bridge arm, the other end of the primary coils of the multiple transformers T after being connected in series is connected to another first-phase bridge arm, and the secondary coil of the transformer T is connected to the output module; since the winding ratio of the transformer T in each step-down circuit is different, the ratio of the output voltage to the input voltage in each step-down circuit is different, so that the step-down module 120 can output multiple low-voltage alternating currents after being stepped down to different degrees through multiple step-down circuits.

[0049] In one embodiment of the present invention, Figure 2 As shown, the output module 130 includes a plurality of second-phase bridge circuits, and the plurality of second-phase bridge circuits are connected to the plurality of step-down circuits in a one-to-one correspondence. The plurality of second-phase bridge circuits are used to convert the low-voltage alternating currents of a plurality of different voltage values ​​into low-voltage direct currents in a one-to-one correspondence.

[0050] Specifically, the multiple second-phase bridge circuits of the output module 130 are respectively connected to the multiple step-down circuits of the step-down module 120, and the multiple low-voltage alternating currents that have been stepped down to different degrees are converted into low-voltage direct currents with different voltage values ​​through the multiple second-phase bridge circuits of the output module 130.

[0051] In one embodiment of the present invention, Figure 2 As shown, each second-phase bridge circuit includes: a second-phase bridge arm, wherein the two ends of the second-phase bridge arm are respectively connected to the two ends of the secondary coil of the corresponding transformer T, and the second-phase bridge arm includes two second switching tubes D2 connected in series; an output unit LV_OUT, wherein one end of the output unit LV_OUT is connected to the two second switching tubes D2 of the second-phase bridge arm, and the other end of the output unit LV_OUT is connected to the secondary coil of the corresponding transformer T, and the output unit LV_OUT is used to output low-voltage direct current.

[0052] Specifically, the second-phase bridge circuit adopts a push-type circuit with low loss and simple driving. The push-type circuit has a small number of components and a relatively low cost. The second-phase bridge circuit includes: a second-phase bridge arm, wherein both ends of the second-phase bridge arm are respectively connected to the secondary coil of the transformer T, and the first-phase bridge arm includes two second switching tubes D2 connected in series. The first switching tube D2 can be a MOSFET tube. The two second switching tubes D2 rectify the AC sine wave output from the secondary side of the transformer T; an output unit LV_OUT, wherein one end of the output unit LV_OUT is connected to the second-phase bridge arm, and the other end of the output unit LV_OUT is connected to the secondary coil of the transformer T for outputting low-voltage direct current.

[0053] Specifically, the output module 130 converts the multiple low-voltage alternating currents into low-voltage direct currents with different voltage values ​​through the multiple second-phase bridge circuits, thereby meeting the needs of different electrical appliances in the vehicle.

[0054] In one embodiment of the present invention, the output unit LV_OUT is connected to the electrical appliance R and / or the battery V. The output unit LV_OUT is used to supply power to the electrical appliance R and / or charge the battery V.

[0055] In a specific embodiment, the electrical appliances R include, but are not limited to, lighting, power windows, wipers, defrosters, instrument systems, entertainment systems, battery management systems, driving controls, power seats, and speakers, and the battery V includes, but is not limited to, a vehicle battery.

[0056] Specifically, the output module 130 converts multiple low-voltage alternating currents into low-voltage direct currents with different voltage values ​​through multiple second-phase bridge circuits. Multiple output units LV_OUT are connected to electrical appliances R and / or batteries V, and transmit the low-voltage direct current to electrical appliances R and / or batteries V, supplying power to electrical appliances R and / or charging batteries V, thereby meeting the needs of different electrical appliances in the vehicle.

[0057] In one embodiment of the present invention, Figure 2 As shown, the input module 110 further includes a first filtering circuit, which is connected to the power supply and is used to filter the high-voltage direct current.

[0058] Specifically, after the input module 110 converts the high-voltage direct current output by the power supply HV_IN into high-voltage alternating current through the first phase bridge circuit, it also filters the high-voltage direct current through the first filtering circuit to ensure the stability of the input power supply and the low level of ripple.

[0059] In one embodiment of the present invention, Figure 2 As shown, the first filtering circuit includes: a first capacitor C1, one end of the first capacitor C1 is connected to the positive electrode of the power supply HV_IN, and the other end of the first capacitor C1 is connected to the negative electrode of the power supply HV_IN; a first inductor L1, one end of the first inductor L1 is connected to a first phase bridge arm, and the other end of the first inductor L1 is connected to one end of the primary coils of multiple transformers T connected in series.

[0060] Specifically, after the input module 110 converts the high-voltage direct current output by the power supply HV_IN into high-voltage alternating current through the first phase bridge circuit, it also performs filtering processing through the first capacitor C1 and the first inductor L1 in the first filtering circuit to remove the ripple component in the DC power supply to ensure the stability of the input power supply and the low level of ripple.

[0061] In one embodiment of the present invention, Figure 2 As shown, each second-phase bridge circuit further includes a second filtering circuit connected to the output unit, and the second filtering circuit is used to filter the low-voltage direct current.

[0062] Specifically, the converted output voltage usually has a certain ripple component. In order to reduce the level of ripple, the output module 130 adds a second filtering circuit to each second-phase bridge circuit, which can not only convert multiple low-voltage AC powers that have been reduced to different degrees into low-voltage DC powers with different voltage values, but also filter multiple low-voltage DC powers with different voltage values ​​to make the output voltage more stable.

[0063] In one embodiment of the present invention, Figure 2As shown, the second filtering circuit includes: a second capacitor C2, one end of the second capacitor C2 is connected to one end of the output unit LV_OUT, and the other end of the second capacitor C2 is connected to the other end of the output unit LV_OUT; a second inductor L2, one end of the second inductor L2 is connected to one end of the output unit, and the other end of the second inductor L2 is connected to the secondary coil of the corresponding transformer T.

[0064] Specifically, the converted output voltage usually has a certain ripple component. In order to reduce the level of ripple, the output module 130 adds a second filtering circuit to each second-phase bridge circuit. The second capacitor C2 and the second inductor L2 in the second filtering circuit can effectively remove the ripple component in the output voltage, so that the output module 130 can not only convert multiple low-voltage alternating currents that have been reduced to different degrees into low-voltage direct currents with different voltage values, but also filter multiple low-voltage direct currents with different voltage values ​​to make the output voltage more stable.

[0065] Figure 3 This is a detailed circuit diagram of a voltage conversion device according to a specific embodiment of the present utility model. Figure 3 In the specific embodiment shown, specifically, combined with Figure 3 As shown, the structure and working principle of the voltage conversion device 100 can be summarized as follows:

[0066] The input module 110 includes a first phase bridge circuit and a first filter circuit.

[0067] The first-phase bridge circuit includes: two first-phase bridge arms connected in parallel, one end of each first-phase bridge arm is connected to the positive electrode of the power supply HV_IN, and the other end is connected to the negative electrode of the power supply HV_IN. Each first-phase bridge arm includes two first switching tubes D1 connected in series. The first switching tube D1 can be a MOSFET tube. The controller modulates the PWM wave with a specific duty cycle to drive the four MOSFET tubes to open and close in a predetermined sequence and time, thereby realizing the current inversion process, modulating the input current into a pulsed rectangular wave, and thus converting high-voltage direct current into high-voltage alternating current.

[0068] The first filtering circuit includes: a first capacitor C1, one end of the first capacitor C1 is connected to the positive electrode of the power supply HV_IN, and the other end of the first capacitor C1 is connected to the negative electrode of the power supply HV_IN; a first inductor L1, one end of the first inductor L1 is connected to a first phase bridge arm, and the other end of the first inductor L1 is connected to one end of the primary coils of multiple transformers T connected in series. The first capacitor C1 and the first inductor L1 in the first filtering circuit perform filtering processing to remove ripple components in the DC power supply, thereby ensuring the stability of the input power supply and a low level of ripple.

[0069] The step-down module 120 includes two step-down circuits connected in series, each step-down circuit including: a transformer T, one end of the primary coil of the transformer T is connected to a first-phase bridge arm, the other end of the primary coil of the transformer T is connected to the primary coil of an adjacent transformer T, and the secondary coil of the transformer T is connected to the output module; wherein the winding ratios of the transformer T in the two step-down circuits are different.

[0070] The input of the transformer T is a pulsed rectangular wave obtained by inversion of the full-bridge circuit. The input voltage passes through the winding of the transformer and is converted into an output voltage by electromagnetic induction. It is transmitted to the secondary side of the transformer T, and an AC sine wave of another voltage amplitude is obtained. Since the winding ratio of the transformer T in each step-down circuit is different, the ratio of the output voltage to the input voltage in each step-down circuit is different. Therefore, the step-down module 120 can output two low-voltage AC powers after being stepped down to different degrees through two step-down circuits.

[0071] The output module 130 includes two second-phase bridge circuits, and each of the two second-phase bridge circuits includes a second filtering circuit.

[0072] The second-phase bridge circuit includes: a second-phase bridge arm, wherein both ends of the second-phase bridge arm are respectively connected to the secondary coil of the transformer T; a first-phase bridge arm including two second switching tubes D2 connected in series, wherein the first switching tube D2 can be a MOSFET tube; and the two second switching tubes D2 rectify the AC sine wave output from the secondary side of the transformer T; an output unit LV_OUT, wherein one end of the output unit LV_OUT is connected to the second-phase bridge arm, and the other end of the output unit LV_OUT is connected to the secondary coil of the transformer T; the output unit LV_OUT is connected to the electrical appliance R and / or the battery V, and the output unit LV_OUT is used to supply power to the electrical appliance R and / or charge the battery V.

[0073] The second filtering circuit includes: a second capacitor C2, one end of the second capacitor C2 is connected to one end of the output unit LV_OUT, and the other end of the second capacitor C2 is connected to the other end of the output unit LV_OUT; a second inductor L2, one end of the second inductor L2 is connected to one end of the output unit, and the other end of the second inductor L2 is connected to the secondary coil of the corresponding transformer T.

[0074] Therefore, the output module 130 adds a second filtering circuit to each second-phase bridge circuit. The second capacitor C2 and the second inductor L2 in the second filtering circuit can effectively remove the ripple component in the output voltage, so that the output module 130 can not only convert two low-voltage alternating currents that have been reduced to different degrees into low-voltage direct currents of different voltage values ​​(such as 14V and 28V), but also filter the two low-voltage direct currents with different voltage values ​​to make the output voltage more stable.

[0075] In summary, the voltage conversion device 100 first converts the high-voltage direct current output by the power supply into high-voltage alternating current through the input module 110; then the converted high-voltage alternating current is subjected to different degrees of voltage reduction through the step-down module 120, and multiple low-voltage alternating currents after being reduced in different degrees are output; finally, the multiple low-voltage alternating currents are respectively converted into low-voltage direct currents of different voltage values ​​through the output module 130; thus, the vehicle only needs to be equipped with one such voltage conversion device 100 to convert the high-voltage direct current output by a power supply such as a power battery into multiple low-voltage direct currents of different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid occupying additional vehicle space, but also effectively reduce costs.

[0076] The embodiment of the present invention further provides a DC-DC converter, which includes the voltage conversion device described in any one of the above embodiments of the present invention.

[0077] The specific implementation method of this DC-DC converter is similar to the specific implementation method of the above-mentioned voltage conversion device. Therefore, the specific implementation details of the DC-DC converter can be found in the above-mentioned specific implementation method of the voltage conversion device. To reduce redundancy, it will not be repeated here.

[0078] According to the DC-DC converter of the embodiment of the present invention, its voltage conversion device first converts the high-voltage DC power output by the power supply into high-voltage AC power through the input module; then the converted high-voltage AC power is reduced to different degrees through the step-down module, and multiple low-voltage AC power after being reduced to different degrees is output; finally, the multiple low-voltage AC power is converted into low-voltage DC power of different voltage values ​​through the output module; thus, the vehicle only needs to be equipped with one such voltage conversion device to convert the high-voltage DC power output by a power source such as a power battery into multiple low-voltage DC power of different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid additional occupation of vehicle space, but also effectively reduce costs.

[0079] In addition, other structures and functions of the DC-DC converter according to the above embodiments of the present invention are well known to those skilled in the art and are not described in detail to reduce redundancy.

[0080] An embodiment of the present invention further provides a vehicle, which includes the voltage conversion device described in any one of the above embodiments of the present invention or the DC-DC converter described in any one of the above embodiments of the present invention.

[0081] The specific implementation method of the vehicle is similar to the specific implementation method of the above-mentioned voltage conversion device or the specific implementation method of the above-mentioned DC-DC converter. Therefore, the specific implementation details of the vehicle can be found in the above-mentioned specific implementation method of the voltage conversion device or DC-DC converter. To reduce redundancy, they will not be repeated here.

[0082] According to the vehicle of the embodiment of the present invention, its voltage conversion device first converts the high-voltage direct current output by the power supply into high-voltage alternating current through the input module; then the converted high-voltage alternating current is reduced in voltage to different degrees through the step-down module, and multiple low-voltage alternating currents after being reduced in voltage to different degrees are output; finally, the multiple low-voltage alternating currents are respectively converted into low-voltage direct currents with different voltage values ​​through the output module; thus, the vehicle only needs to be equipped with one such voltage conversion device to convert the high-voltage direct current output by a power source such as a power battery into multiple low-voltage direct currents with different voltage values, which are correspondingly supplied to different electrical appliances in the vehicle, thereby avoiding the problem that the vehicle needs to carry multiple DC-DC converters to power different electrical appliances. Therefore, this voltage conversion device can not only effectively reduce the weight of the vehicle and avoid occupying additional vehicle space, but also effectively reduce costs.

[0083] In addition, other structures and functions of the vehicle according to the above embodiments of the present invention are well known to ordinary technicians in this field and will not be described in detail to reduce redundancy.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0085] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0086] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A voltage conversion device, characterized in that: include: An input module, connected to a power supply, configured to convert the high-voltage direct current output by the power supply into high-voltage alternating current. The input module comprises a first-phase bridge circuit, wherein the first-phase bridge circuit comprises two first-phase bridge arms connected in parallel, one end of each first-phase bridge arm being connected to the positive electrode of the power supply, and the other end of each first-phase bridge arm being connected to the negative electrode of the power supply, and each first-phase bridge arm comprising two first switching tubes connected in series; a step-down module connected to the input module, configured to step down the high-voltage alternating current to varying degrees, thereby correspondingly outputting a plurality of low-voltage alternating currents with different voltage values; the step-down module comprising a plurality of step-down circuits, wherein the plurality of step-down circuits are connected in series, one end of the plurality of step-down circuits connected in series is connected to one first-phase bridge arm, and the other end of the plurality of step-down circuits connected in series is connected to another first-phase bridge arm; each step-down circuit steps down the high-voltage alternating current to varying degrees, thereby correspondingly outputting a low-voltage alternating current with a different voltage value; An output module is connected to the step-down module, and is used to convert the low-voltage alternating currents of multiple different voltage values ​​into low-voltage direct currents.

2. The voltage conversion device according to claim 1, wherein: Each of the step-down circuits comprises: A transformer, wherein the primary coils of the transformers of the multiple step-down circuits are connected in series, one end of the multiple primary coils of the transformers connected in series is connected to one first-phase bridge arm, the other end of the multiple primary coils of the transformers connected in series is connected to another first-phase bridge arm, and the secondary coil of the transformer is connected to the output module; The winding ratio of the transformer in each step-down circuit is different.

3. The voltage conversion device according to claim 2, wherein: The output module includes multiple second-phase bridge circuits, which are connected to the multiple step-down circuits in a one-to-one correspondence. The multiple second-phase bridge circuits are used to convert the low-voltage alternating currents of multiple different voltage values ​​into low-voltage direct currents in a one-to-one correspondence.

4. The voltage conversion device according to claim 3, wherein: Each of the second phase bridge circuits comprises: A second phase bridge arm, wherein two ends of the second phase bridge arm are respectively connected to two ends of the secondary coil of the corresponding transformer, and the second phase bridge arm includes two second switching tubes connected in series; An output unit, one end of which is connected to the two second switching tubes of the second phase bridge arm, and the other end of which is connected to the corresponding secondary coil of the transformer, and the output unit is used to output corresponding low-voltage direct current.

5. The voltage conversion device according to claim 2, wherein: The input module further includes a first filtering circuit connected to the power supply, and the first filtering circuit is used to filter the high-voltage direct current.

6. The voltage conversion device according to claim 4, wherein: Each second-phase bridge circuit further includes a second filtering circuit connected to the output unit, and the second filtering circuit is configured to filter the low-voltage direct current.

7. A DC-DC converter, characterized in that: The device comprises a voltage conversion device as claimed in any one of claims 1 to 6.

8. A vehicle, characterized in that: comprising the DC-DC converter as claimed in claim 7.

Images