Novel vehicle-mounted high-voltage inverter power supply system

Abstract

The invention discloses a novel vehicle-mounted high-voltage inverter power supply system, which is characterized by comprising a bidirectional DC / DC module, a bidirectional DC / AC inverter, a control unit and a filtering unit, the control unit is connected with the filtering unit through the bidirectional DC / DC module. The control unit is connected with the filtering unit through the bidirectional DC / AC inverter. And the bidirectional DC / DC module is electrically connected with the bidirectional DC / AC inverter.

Description

Technical Field

[0001] This invention belongs to the field of commercial vehicle electrical systems, specifically relating to a novel on-board high-voltage inverter power supply system and control method. Background Technology

[0002] Currently, in the commercial vehicle sector, on-board inverters typically convert 24V DC power from the battery to 220V AC power. Their operation involves a two-stage conversion: DC / DC boost and DC / AC inversion, to achieve the conversion from low-voltage DC to high-voltage AC. However, with the increasing prevalence of 800V high-voltage platforms in new energy vehicles, the performance requirements for inverters have significantly increased. Traditional inverters are struggling to meet the high power density and high efficiency demands of these 800V platforms.

[0003] The following problems exist in the existing technology:

[0004] 1. The power is generally small, and can only meet the needs of some low-power electrical equipment.

[0005] 2. Large size and heavy weight of power supplies of equivalent power: Low-voltage 24V systems require a large current to meet power requirements, resulting in large size of passive components such as inductors and capacitors, which are difficult to integrate.

[0006] 3. Low efficiency: Silicon-based IGBTs have high switching losses, and the system efficiency is usually below 90%.

[0007] 4. It has a single function, with only unidirectional discharge capability.

[0008] 5. Low power density, currently around 2kW / L.

[0009] 6. High heat dissipation requirements.

[0010] 7. Prolonged use can easily cause low-voltage batteries to run out of power. Summary of the Invention

[0011] The purpose of this invention is to provide a novel vehicle-mounted high-voltage inverter power supply system and control method. It takes 800V high-voltage DC power as input, passes it through an input filter, a rectifier circuit, and an inverter circuit, and then filters it again to output 220V AC power. It can also achieve bidirectional conversion, taking 220V AC power as input and outputting 800V high-voltage DC power.

[0012] To address the aforementioned problems in the existing technology, the technical solution adopted by this invention is as follows:

[0013] A novel vehicle-mounted high-voltage inverter power supply system includes: a bidirectional DC / DC module, a bidirectional DC / AC inverter, a control unit, and a filtering unit;

[0014] The control unit is connected to the filter unit via a bidirectional DC / DC module, and the control unit is also connected to the filter unit via a bidirectional DC / AC inverter.

[0015] The bidirectional DC / DC module is electrically connected to the bidirectional DC / AC inverter.

[0016] Integrating a bidirectional DC / DC module with a bidirectional DC / AC inverter enables the power system to convert AC to DC while simultaneously boosting and bucking voltage, thus expanding its applicability.

[0017] 1. Bidirectional DC / DC converter: A multi-output DC / DC module that enables the boost conversion of the output voltage from the solar panel and the buck conversion of 800V high-voltage DC to low-voltage DC;

[0018] 2. Bidirectional DC / AC Inverter: Enables bidirectional conversion between 800V high-voltage DC and 220V AC power;

[0019] 3. Control Unit: Responsible for system control, protection, and communication;

[0020] 4. Filtering circuit: Filters out electromagnetic interference to ensure the quality of output power;

[0021] Furthermore, the control unit is electrically connected to the input side, which includes a solar panel, a 24V low-voltage system, an 800V high-voltage power battery, and 220VAC; the filter unit is electrically connected to the output side, which includes a 24V low-voltage system, an 800V high-voltage power battery, and 220VAC.

[0022] The main circuit unit of the vehicle-mounted high-voltage inverter power supply system described in this invention is connected to the vehicle's power battery distribution box. It takes 800V high-voltage DC power as input, which passes through an input filter, rectifier circuit, and inverter circuit, and then is filtered to output 220V AC power. It can also achieve bidirectional conversion, taking 220V AC power as input and outputting 800V high-voltage DC power.

[0023] This invention can detect the load connection status of the output port before the power supply is turned on or starts working, and then proceed to the next step of work determination. This can effectively avoid the inverter power supply running under no-load and the loss of components when the load is not connected or working, improve the control accuracy of the inverter power supply, reduce the working loss of the inverter power supply and extend the application cycle of the inverter power supply.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. This vehicle-mounted high-voltage inverter power supply solution uses SiC power modules. SiC MOSFETs have faster switching speeds and no tail current, so their switching losses have a significant advantage over IGBTs, with an efficiency of up to 98% and a reduction in losses of 8% to 13%.

[0026] 2. This vehicle-mounted high-voltage inverter power supply solution can reduce module size and increase power density to 6kW / L, which is 3 times higher than existing products.

[0027] 3. This vehicle-mounted high-voltage inverter power supply solution supports bidirectional function and can reverse to replenish the vehicle's power battery, which can be used in emergency situations when the battery is low.

[0028] 4. This vehicle-mounted high-voltage inverter power supply solution is compatible with solar photovoltaic input interfaces, has a wide input high-voltage DC voltage range, and can support DC voltage input from 400V to 1000V.

[0029] 5. Solar energy input can be used to charge the entire vehicle, increasing the driving range of electric vehicles, reducing carbon emissions, and conforming to the concept of environmental protection. Attached Figure Description

[0030] Figure 1 This is a structural connection block diagram of the present invention;

[0031] Figure 2 This describes the actual working principle of the present invention. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and reference numerals.

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] Example 1:

[0038] like Figure 1 As shown, a novel vehicle-mounted high-voltage inverter power supply system includes: a bidirectional DC / DC module, a bidirectional DC / AC inverter, a control unit, and a filtering unit;

[0039] The control unit is connected to the filter unit via a bidirectional DC / DC module, and the control unit is also connected to the filter unit via a bidirectional DC / AC inverter.

[0040] The bidirectional DC / DC module is electrically connected to the bidirectional DC / AC inverter.

[0041] Integrating a bidirectional DC / DC module with a bidirectional DC / AC inverter enables the power system to convert AC to DC while simultaneously boosting and bucking voltage, thus expanding its applicability.

[0042] Example 2:

[0043] Based on Example 1, such as Figure 2 As shown, the control unit is electrically connected to the input side, which includes a solar panel, a 24V low-voltage system, an 800V high-voltage power battery, and 220VAC.

[0044] The filter unit is electrically connected to the output side, which includes a 24V low-voltage system, an 800V high-voltage power battery, and 220VAC.

[0045] The input side and output side are special definitions. In actual operation, the side that inputs current into the inverter power supply system is the input side, and the side that receives current output from the inverter power supply system is the output side. The input side and output side are relative. The same module can be either the input side or the output side depending on the usage environment.

[0046] 1. The vehicle-mounted high-voltage inverter designed in this solution has bidirectional energy conversion capabilities and can meet various application scenarios:

[0047] Serial Number Input end Output 1 High voltage DC power battery 220V AC power 2 220V AC power High voltage DC power battery 3 High voltage DC power battery 24V low voltage DC power 4 24V low voltage DC power High voltage DC power battery 5 24V low voltage DC power 220V AC power 6 Solar panels High voltage DC power battery

[0048] For example, in applications where a real vehicle requires both 24V low-voltage DC power and 220V AC power, this on-board high-voltage inverter can take the 800V DC power from the power battery, pass it through a DC-DC module, step down one path to directly output 24V DC power, and step down the other path to a DC-AC module, where it is then inverted to output 220V AC power.

[0049] 2. During operation, the on-board high-voltage inverter power supply designed in this scheme can monitor the input and output voltage and current values ​​in real time through voltage and current sensors in the circuit, and report the fault status to the vehicle at the same time.

[0050] 3. The MOSFETs of the vehicle-mounted high-voltage inverter power switching module designed in this scheme are made of silicon carbide, achieving a high-efficiency and high-power-density system.

[0051] 4. The vehicle-mounted high-voltage inverter power supply designed in this scheme adopts SPWM control technology, which can identify the load type, dynamically adjust the output power, and provide a stable sinusoidal output voltage.

[0052] 5. The vehicle-mounted high-voltage inverter designed in this solution has overvoltage protection, undervoltage protection, overtemperature protection, short circuit protection, and overload protection, providing high safety and ensuring user safety.

[0053] 6. The vehicle-mounted high-voltage inverter designed in this solution supports OTA function, which can remotely update data and improve the efficiency of problem handling.

[0054] Specific working principle:

[0055] Scenario 1: The input side receives 800V high-voltage DC power, which is first stepped down by a bidirectional DC / DC module, and then converted into AC power by a bidirectional DC / AC inverter. The output side outputs 220V AC power.

[0056] Scenario 2: The input side receives 220V AC power, which is first converted into DC power by a bidirectional DC / AC inverter, and then boosted by a DC / DC module to output 800V high-voltage DC power.

[0057] Scenario 3: The input side receives 800V high-voltage DC power, which is stepped down by a bidirectional DC / DC module, and the output side outputs 24V low-voltage DC power.

[0058] Scenario 4: Input 24V low-voltage DC power, boosted by bidirectional DC / DC module, output 800V high-voltage DC power.

[0059] Scenario 5: The input side receives 24V low-voltage DC power, which is first boosted by a bidirectional DC / DC module, and then converted into AC power by a bidirectional DC / AC inverter, outputting 220V AC power on the output side.

[0060] Scenario 6: The input side is powered by a solar panel, which first boosts the voltage through a bidirectional DC / DC module, and then converts it into AC power through a bidirectional DC / AC inverter. The output side outputs 220V AC power.

[0061] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A novel vehicle-mounted high-voltage inverter power supply system, characterized in that, include: Bidirectional DC / DC module, bidirectional DC / AC inverter, control unit and filter unit; The control unit is connected to the filter unit via a bidirectional DC / DC module, and the control unit is also connected to the filter unit via a bidirectional DC / AC inverter. The bidirectional DC / DC module is electrically connected to the bidirectional DC / AC inverter.

2. The novel vehicle-mounted high-voltage inverter power supply system according to claim 1, characterized in that, The control unit is electrically connected to the input side, which includes a solar panel, a 24V low-voltage system, an 800V high-voltage power battery, and 220VAC.

3. The novel vehicle-mounted high-voltage inverter power supply system according to claim 1, characterized in that, The filter unit is electrically connected to the output side, which includes a 24V low-voltage system, an 800V high-voltage power battery, and 220VAC.

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