High-voltage inverter for new energy electric vehicle

Abstract

The utility model relates to a high-voltage inverter for a new energy electric vehicle, which comprises a direct-current input interface, an alternating-current output interface, an IGBT inverter bridge, an IGBT driving module, an input voltage sampling circuit, an output voltage sampling circuit, a current sampling circuit, a first singlechip, an isolation power supply module and a first voltage stabilizing module, the input end of the input voltage sampling circuit is connected with the DC input interface, and the output end of the input voltage sampling circuit is connected with the sampling port of the first single-chip microcomputer. The input end of the output voltage sampling circuit is connected with the AC output interface, and the output end of the output voltage sampling circuit is connected with the sampling port of the first single-chip microcomputer. The input end of the current sampling circuit is connected with the emitting electrode of the IGBT inverter bridge, and the output end of the current sampling circuit is connected with the sampling port of the first single-chip microcomputer. The high-voltage inverter has a wide voltage input range, can take a battery pack of a new energy automobile as an input power supply, can output higher power, and meets the requirement that various electric appliances are used at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle-mounted inverters, and in particular to a high-voltage inverter for new energy electric vehicles. Background Art

[0002] As people's requirements for travel comfort and convenience increase, vehicle inverters come into being.

[0003] A car inverter is a device that converts the direct current of a car battery into alternating current for use in various household appliances such as laptops, fans, vacuum cleaners, etc. The car inverter has become one of the important devices necessary for these household appliances to work properly in the car.

[0004] At present, new energy electric vehicles are favored by more and more people, and new energy electric vehicles are likely to replace traditional fuel vehicles. The battery technology of new energy electric vehicles has made rapid progress, and the voltage level has become higher and higher, even developing to the 800V voltage platform.

[0005] Compared with storage batteries, battery packs can provide greater electrical power. Obviously, the reverse output of the battery pack's electrical energy can meet the needs of more electrical devices at the same time.

[0006] The input voltage of traditional vehicle inverters is generally 9-36V, which is too low and not suitable for new energy electric vehicles. Utility Model Content

[0007] Based on the above description, the utility model provides a new energy electric vehicle high-voltage inverter, which has a higher input voltage level and can be suitable for new energy electric vehicles.

[0008] The technical solution of the utility model to solve the above technical problems is as follows:

[0009] A high-voltage inverter for a new energy electric vehicle comprises a DC input interface, an AC output interface, an IGBT inverter bridge, an IGBT drive module, an input voltage sampling circuit, an output voltage sampling circuit, a current sampling circuit, a first single-chip microcomputer, an isolated power supply module and a first voltage stabilizing module; the DC input interface is connected to the input end of the IGBT inverter bridge, and the output end of the IGBT inverter bridge is connected to the AC output interface; the control signal output end of the first single-chip microcomputer is connected to the control signal input end of the IGBT drive module, and the drive signal output end of the IGBT drive module is connected to the control end of the IGBT inverter bridge; the input end of the input voltage sampling circuit is connected to the DC input interface, and the output end of the input voltage sampling circuit is connected to the sampling port of the first single-chip microcomputer; the input end of the output voltage sampling circuit is connected to the AC output interface, and the output end of the output voltage sampling circuit is connected to the sampling port of the first single-chip microcomputer; the input end of the current sampling circuit is connected to the emitter of the IGBT inverter bridge, and the output end of the current sampling circuit is connected to the sampling port of the first single-chip microcomputer.

[0010] As a preferred solution: it also includes a temperature detection module, which is in contact with the circuit board where the IGBT inverter bridge is located and is used to detect the temperature of the IGBT inverter bridge; the temperature detection module is connected to the sampling port of the first single-chip microcomputer.

[0011] As a preferred solution: the output end of the isolated power supply module is connected to the input end of the first voltage stabilizing module, and the output end of the first voltage stabilizing module is connected to the power port of the first single-chip microcomputer; the isolated power supply module outputs DC15V direct current, and the first voltage stabilizing module converts the DC15V direct current into DC5V direct current, thereby powering the first single-chip microcomputer.

[0012] As a preferred solution: it also includes a digital isolation module, a second single-chip microcomputer, a CAN transceiver and a signal interface; the signal acquisition end of the digital isolation module is connected to the signal output end of the first single-chip microcomputer, the signal output end of the digital isolation module is connected to the signal input end of the second single-chip microcomputer, the communication port of the second single-chip microcomputer is connected to the receiving end of the CAN transceiver, and the transmitting end of the CAN transceiver is connected to the signal interface.

[0013] As a preferred solution: it also includes a second voltage stabilizing module and a third voltage stabilizing module, the input end of the second voltage stabilizing module is connected to the output end of the isolation power supply module, the output end of the second voltage stabilizing module is connected to the input end of the third voltage stabilizing module, the output end of the third voltage stabilizing module is connected to the power interface of the second single-chip microcomputer and the digital isolation module, the power interface of the CAN transceiver is connected to the output end of the second voltage stabilizing module, and the output end of the first voltage stabilizing module is connected to the power interface of the digital isolation module; the second voltage stabilizing module converts the DC15V power supply into a DC5V power supply, and the second voltage stabilizing module provides the DC5V power supply to the CAN transceiver; the third voltage stabilizing module converts the DC5V power supply into a DC3.3V power supply, and the third voltage stabilizing module provides the DC3.3V power supply to the second single-chip microcomputer and the digital isolation module.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0015] The high-voltage inverter has a high input voltage and is suitable for use scenarios with high-voltage power input. The high-voltage inverter has a wide voltage input range, supporting an input voltage of DC400V to DC800V, enabling it to use the battery pack of a new energy vehicle as an input power source and output greater power, meeting the needs of using multiple electrical appliances at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a circuit principle block diagram of the high voltage inverter in the first embodiment;

[0017] Figure 2 This is a circuit principle block diagram of the high voltage inverter in the second embodiment. DETAILED DESCRIPTION

[0018] Embodiment 1:

[0019] Reference Figure 1 A high-voltage inverter for a new energy electric vehicle includes a DC input interface, an AC output interface, an IGBT inverter bridge, an IGBT drive module, an input voltage sampling circuit, an output voltage sampling circuit, a current sampling circuit, a first single-chip microcomputer, an isolation power supply module and a first voltage stabilization module.

[0020] Among them, the DC input interface is connected to the input end of the IGBT inverter bridge, and the output end of the IGBT inverter bridge is connected to the AC output interface; the control signal output end of the first single-chip microcomputer is connected to the control signal input end of the IGBT drive module, and the drive signal output end of the IGBT drive module is connected to the control end of the IGBT inverter bridge; the input end of the input voltage sampling circuit is connected to the DC input interface, and the output end of the input voltage sampling circuit is connected to the sampling port of the first single-chip microcomputer; the input end of the output voltage sampling circuit is connected to the AC output interface, and the output end of the output voltage sampling circuit is connected to the sampling port of the first single-chip microcomputer; the input end of the current sampling circuit is connected to the emitter of the IGBT inverter bridge, and the output end of the current sampling circuit is connected to the sampling port of the first single-chip microcomputer.

[0021] The working principle of the high voltage inverter is:

[0022] Connect the DC input interface to the charging socket outside the new energy electric vehicle, and the battery pack of the new energy electric vehicle will output electric energy in reverse. The battery pack outputs high-voltage DC to the inverter, and the input voltage sampling circuit collects the input voltage on the DC input interface and feeds back the detected input voltage value to the first single-chip microcomputer. The first single-chip microcomputer sends a control instruction to the IGBT drive module according to the input voltage value. After receiving the control instruction, the IGBT drive module outputs a PWM drive signal to the IGBT inverter bridge, so that the IGBT inverter bridge performs switching actions at the corresponding frequency, so that the IGBT inverter bridge outputs 220V AC. In this way, the high-voltage DC output of the battery pack can be converted into the 220V AC required for the operation of various electrical appliances.

[0023] In addition, during the operation of the high-voltage inverter, the output voltage sampling circuit collects the AC voltage value on the AC output interface in real time, and feeds back the detected output voltage value to the first single-chip microcomputer. The first single-chip microcomputer sends a control instruction to the IGBT drive module according to the output voltage value, thereby realizing feedback adjustment of the PWM signal output by the IGBT drive module.

[0024] During the operation of the high-voltage inverter, the current sampling circuit collects the emitter current of the IGBT inverter bridge and feeds the collected current value back to the first single-chip microcomputer.

[0025] The high-voltage inverter has a high input voltage and is suitable for use scenarios with high-voltage power input. The high-voltage inverter has a wide voltage input range, supporting an input voltage of DC400V to DC800V, enabling it to use the battery pack of a new energy vehicle as an input power source and output greater power, meeting the needs of using multiple electrical appliances at the same time.

[0026] The high-voltage inverter in this embodiment also includes a temperature detection module, which is in contact with the circuit board where the IGBT inverter bridge is located, and is used to detect the temperature of the IGBT inverter bridge. The temperature detection module is connected to the sampling port of the first single-chip microcomputer. During the operation of the inverter, the temperature detection module detects the temperature of the IGBT inverter bridge and feeds back the detected temperature value to the first single-chip microcomputer. The first single-chip microcomputer compares the detected temperature value with the preset temperature value. When the former is greater than the latter, the first single-chip microcomputer sends a "stop" command to the IGBT drive module. After receiving the "stop" command, the IGBT drive module stops sending a drive signal to the IGBT inverter bridge. At this time, the IGBT inverter bridge stops working, which plays an emergency protection role to prevent the inverter from being damaged by high temperature.

[0027] In this embodiment, the input end of the isolated power supply module can be connected to the car cigarette lighter, and the car cigarette lighter interface outputs DC12V or DC24V power to the isolated power supply module, and the isolated power supply module converts the input power into DC15V direct current. The isolated power supply module directly provides 15V direct current to the IGBT drive module; the output end of the isolated power supply module is connected to the input end of the first voltage stabilizing module, and the output end of the first voltage stabilizing module is connected to the power port of the first single-chip microcomputer. The first voltage stabilizing module converts DC15V direct current into DC5V direct current, thereby powering the first single-chip microcomputer.

[0028] Embodiment 2:

[0029] Reference Figure 2 This embodiment adds a digital isolation module, a second single-chip microcomputer, a CAN transceiver and a signal interface on the basis of the first embodiment, wherein the signal acquisition end of the digital isolation module is connected to the signal output end of the first single-chip microcomputer, the signal output end of the digital isolation module is connected to the signal input end of the second single-chip microcomputer, the communication port of the second single-chip microcomputer is connected to the receiving end of the CAN transceiver, and the transmitting end of the CAN transceiver is connected to the signal interface.

[0030] Since the first single-chip microcomputer works in a high-voltage environment, a digital isolation module is required to isolate the high voltage and realize the transmission of information collection.

[0031] During the operation of the high-voltage inverter, the first single-chip microcomputer transmits the collected high-voltage DC voltage signal, temperature signal, AC output voltage and current signal to the second single-chip microcomputer through the digital isolation module. The second single-chip microcomputer processes and converts the received signal to obtain the working status information of the high-voltage inverter. The second single-chip microcomputer sends the working status information to the CAN transceiver, and the CAN transceiver transmits the information to the external device through the signal interface, thereby realizing the monitoring of the working status of the high-voltage inverter.

[0032] The high-voltage inverter in this embodiment also includes a second voltage stabilizing module and a third voltage stabilizing module, wherein the input end of the second voltage stabilizing module is connected to the output end of the isolation power supply module, the output end of the second voltage stabilizing module is connected to the input end of the third voltage stabilizing module, the output end of the third voltage stabilizing module is connected to the second single-chip microcomputer and the power interface of the digital isolation module, and the power interface of the CAN transceiver is connected to the output end of the second voltage stabilizing module.

[0033] In addition, the output end of the first voltage stabilizing module is connected to the power interface of the digital isolation module.

[0034] The isolation power supply module outputs DC15V power to the second voltage stabilizing module, the second voltage stabilizing module converts the DC15V power into DC5V power, and the second voltage stabilizing module provides DC5V power to the CAN transceiver; the third voltage stabilizing module converts the DC5V power into DC3.3V power, and the third voltage stabilizing module provides DC3.3V power to the second single-chip microcomputer and the digital isolation module.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage inverter for new energy electric vehicles, including a DC input interface, an AC output interface, an IGBT inverter bridge, and an IGBT drive module, characterized in that: It also includes an input voltage sampling circuit, an output voltage sampling circuit, a current sampling circuit, a first single-chip microcomputer, an isolation power supply module and a first voltage stabilizing module; the DC input interface is connected to the input end of the IGBT inverter bridge, and the output end of the IGBT inverter bridge is connected to the AC output interface; the control signal output end of the first single-chip microcomputer is connected to the control signal input end of the IGBT drive module, and the drive signal output end of the IGBT drive module is connected to the control end of the IGBT inverter bridge; the input end of the input voltage sampling circuit is connected to the DC input interface, and the output end of the input voltage sampling circuit is connected to the sampling port of the first single-chip microcomputer; the input end of the output voltage sampling circuit is connected to the AC output interface, and the output end of the output voltage sampling circuit is connected to the sampling port of the first single-chip microcomputer; the input end of the current sampling circuit is connected to the emitter of the IGBT inverter bridge, and the output end of the current sampling circuit is connected to the sampling port of the first single-chip microcomputer.

2. The high-voltage inverter for new energy electric vehicles according to claim 1 is characterized in that: It also includes a temperature detection module, which is in contact with the circuit board where the IGBT inverter bridge is located and is used to detect the temperature of the IGBT inverter bridge; the temperature detection module is connected to the sampling port of the first single-chip microcomputer.

3. The high-voltage inverter for new energy electric vehicles according to claim 1 is characterized in that: The output end of the isolated power supply module is connected to the input end of the first voltage stabilizing module, and the output end of the first voltage stabilizing module is connected to the power port of the first single-chip microcomputer; the isolated power supply module outputs DC15V direct current, and the first voltage stabilizing module converts the DC15V direct current into DC5V direct current, thereby powering the first single-chip microcomputer.

4. The high-voltage inverter for new energy electric vehicles according to claim 1 is characterized in that: It also includes a digital isolation module, a second single-chip microcomputer, a CAN transceiver and a signal interface; the signal acquisition end of the digital isolation module is connected to the signal output end of the first single-chip microcomputer, the signal output end of the digital isolation module is connected to the signal input end of the second single-chip microcomputer, the communication port of the second single-chip microcomputer is connected to the receiving end of the CAN transceiver, and the transmitting end of the CAN transceiver is connected to the signal interface.

5. The high-voltage inverter for new energy electric vehicles according to claim 4 is characterized in that: It also includes a second voltage stabilizing module and a third voltage stabilizing module, the input end of the second voltage stabilizing module is connected to the output end of the isolation power supply module, the output end of the second voltage stabilizing module is connected to the input end of the third voltage stabilizing module, the output end of the third voltage stabilizing module is connected to the power interface of the second single-chip microcomputer and the digital isolation module, the power interface of the CAN transceiver is connected to the output end of the second voltage stabilizing module, and the output end of the first voltage stabilizing module is connected to the power interface of the digital isolation module; the second voltage stabilizing module converts the DC15V power supply into a DC5V power supply, and the second voltage stabilizing module provides the DC5V power supply to the CAN transceiver; the third voltage stabilizing module converts the DC5V power supply into a DC3.3V power supply, and the third voltage stabilizing module provides the DC3.3V power supply to the second single-chip microcomputer and the digital isolation module.

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