A DC / DC converter, output reverse connection detection method and device

Abstract

The embodiments of the present invention disclose a DC / DC converter, an output reverse connection detection method, and an apparatus. The method includes: obtaining a voltage signal at the positive output terminal of the DC / DC converter; determining an output reverse connection detection result of the DC / DC converter based on the obtained voltage signal; and controlling the DC / DC converter to turn on or off based on the output reverse connection detection result. By obtaining the voltage signal at the positive output terminal of the DC / DC converter, determining the output connection status of the DC / DC converter, and controlling the DC / DC converter to turn on or off based on the output connection status of the DC / DC converter, the reverse connection of the DC / DC converter can be detected in a timely manner when the output terminal of the DC / DC converter is reversed, and the DC / DC converter can be controlled to stop working, thereby preventing an external low-voltage power supply from damaging the internal power devices of the DC / DC converter and avoiding damage to the DC / DC converter due to improper operation.

Description

Technical Field

[0001] The embodiments of the present invention relate to DC / DC converter technology, and in particular to a DC / DC converter, an output reverse connection detection method and a device. Background Art

[0002] With the continuous growth in production and sales of electric vehicles in my country, and the increasing number of electric vehicles on the road, after-sales maintenance tasks are becoming increasingly demanding. The DC / DC converter is a key component that converts the high-voltage DC power from the power battery into low-voltage DC power to power the 12V system. Prolonged use of the in-vehicle entertainment system when the DC / DC converter is not operating, or a DC / DC converter failure while the vehicle is operating, can lead to a depleted 12V battery.

[0003] When the 12V battery is low, it's necessary to connect the positive and negative terminals of an external 12V power supply to the positive and negative terminals of the faulty vehicle's battery, then start the vehicle and allow the DC / DC converter to work again and charge the 12V battery. Due to various factors such as unskilled operation or poor lighting, the external 12V power supply may be connected in reverse polarity. The vehicle's 12V battery has a reverse polarity protection function to protect the 12V battery from damage in the event of reverse polarity. However, DC / DC converters generally lack reverse polarity protection. Reverse polarity of the external 12V power supply can damage the power devices within the DC / DC converter, and even cause faults such as short circuits and burnout. Furthermore, when the external 12V power supply is connected in reverse polarity, the DC / DC converter lacks reverse polarity protection, resulting in no electrical signal inside the DC / DC converter. This makes it impossible to detect and record the reverse output, causing significant trouble for after-sales repairs. Summary of the Invention

[0004] The embodiments of the present invention provide a DC / DC converter, an output reverse connection detection method and a device, which can prevent the DC / DC converter from being damaged when the positive and negative polarity of an external power supply are reversed and detect and record the reverse connection fault in a timely manner.

[0005] In a first aspect, an embodiment of the present invention provides a method for detecting reverse connection of a DC / DC converter output, wherein the DC / DC converter includes a main control unit, an output terminal, and a low-voltage power supply terminal. The method includes:

[0006] Acquiring a voltage signal at the positive output terminal of the DC / DC converter;

[0007] determining an output reverse connection detection result of the DC / DC converter according to the acquired voltage signal;

[0008] Based on the output reverse connection detection result, the DC / DC converter is controlled to be turned on or off.

[0009] Optionally, the DC / DC converter further includes a bus interface terminal; before obtaining the voltage signal of the positive output terminal of the DC / DC converter, the method includes:

[0010] The message information sent by the vehicle controller is obtained through the bus interface end; wherein the message information includes a start-up instruction of the DC / DC converter.

[0011] Optionally, before obtaining the voltage signal of the positive output terminal of the DC / DC converter, the method includes:

[0012] The low-voltage power supply end of the DC / DC converter is powered on.

[0013] Optionally, determining an output reverse connection detection result of the DC / DC converter according to the acquired voltage signal includes:

[0014] Determining whether the acquired voltage signal is less than zero;

[0015] If the voltage signal is less than zero, determining that the output terminal of the DC / DC converter is reversely connected;

[0016] If the voltage signal is greater than or equal to zero, it is determined that the output terminal of the DC / DC converter is connected normally.

[0017] Optionally, controlling the DC / DC converter to be turned on or off based on the output reverse connection detection result includes:

[0018] If the output terminal of the DC / DC converter is reversely connected, the DC / DC converter is controlled to stop working;

[0019] If the output end of the DC / DC converter is connected normally, the DC / DC converter is controlled to operate normally.

[0020] Optionally, controlling the DC / DC converter to be turned on or off based on the output reverse connection detection result includes:

[0021] If the output terminal of the DC / DC converter is reversely connected, controlling the DC / DC converter to stop working and storing information that the output terminal of the DC / DC converter is reversely connected;

[0022] Return to the step of determining whether the acquired voltage signal is less than zero.

[0023] In a second aspect, an embodiment of the present invention further provides a DC / DC converter output reverse connection detection device, the device comprising:

[0024] A voltage acquisition module, configured to acquire a voltage signal at the positive output terminal of the DC / DC converter;

[0025] a result analysis module, configured to determine an output reverse connection detection result of the DC / DC converter according to the acquired voltage signal;

[0026] A control module is used to control the DC / DC converter to be turned on or off based on the output reverse connection detection result.

[0027] In a third aspect, an embodiment of the present invention further provides a DC / DC converter, comprising: a main control unit, an isolation power conversion unit, a voltage sampling unit, a high-voltage input terminal, an output terminal, and a low-voltage power supply terminal;

[0028] The main control unit is connected to the isolated power conversion unit, the voltage sampling unit and the low-voltage power supply end respectively; the isolated power conversion unit is connected to the high-voltage input end and the output end;

[0029] The output end includes a positive output end and a negative output end, the positive output end is connected to the voltage sampling unit; the voltage sampling unit is connected to the low-voltage power supply end;

[0030] The main control unit implements the DC / DC converter output reverse connection detection method according to the embodiment of the present invention.

[0031] Optionally, it also includes: a positive and negative voltage power supply unit;

[0032] The input end of the positive and negative voltage power supply unit is connected to the low voltage power supply end, and the main control unit and the voltage sampling unit are both connected to the output end of the positive and negative voltage power supply unit;

[0033] The positive and negative voltage power supply unit is used to receive the electrical signal provided by the low voltage power supply end and supply power to the main control unit and the voltage sampling unit.

[0034] Optionally, it also includes: a transceiver unit and a bus interface terminal;

[0035] The transceiver unit is connected to the main control unit, the positive and negative voltage power supply unit and the bus interface terminal respectively;

[0036] The positive and negative voltage power supply unit is also used to supply power to the transceiver unit; the message information between the bus interface end and the main control unit is exchanged via the transceiver unit.

[0037] An embodiment of the present invention provides a method for detecting reverse connection of a DC / DC converter output. By acquiring a voltage signal at the positive output terminal of the DC / DC converter, the connection status of the output terminal of the DC / DC converter is determined, and the DC / DC converter is controlled to be turned on or off according to the connection status of the output terminal of the DC / DC converter. When the output terminal of the DC / DC converter is reverse connected, the reverse connection of the output terminal of the DC / DC converter can be detected in a timely manner and the DC / DC converter can be controlled to stop operation, thereby preventing an external low-voltage power supply from damaging the internal power devices of the DC / DC converter and avoiding damage to the DC / DC converter due to improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a flow chart of a method for detecting reverse connection of a DC / DC converter output provided by an embodiment of the present invention;

[0039] Figure 2 This is a flow chart of another method for detecting reverse connection of a DC / DC converter output provided by an embodiment of the present invention;

[0040] Figure 3 This is a flow chart of another method for detecting reverse connection of a DC / DC converter output provided by an embodiment of the present invention;

[0041] Figure 4 This is a structural block diagram of a DC / DC converter output reverse connection detection device provided by an embodiment of the present invention;

[0042] Figure 5 This is a system block diagram of a DC / DC converter provided by an embodiment of the present invention;

[0043] Figure 6 This is a system block diagram of another DC / DC converter provided by an embodiment of the present invention;

[0044] Figure 7 This is a schematic diagram of the circuit structure of a positive and negative voltage power supply unit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0046] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the steps as sequential processes, many of the steps can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the steps can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0047] The embodiment of the present invention provides a method for detecting reverse connection of a DC / DC converter output. Figure 1 This is a flow chart of a method for detecting reverse connection of a DC / DC converter output provided by an embodiment of the present invention. This embodiment is applicable to detecting reverse connection of a DC / DC converter output. This method can be performed by a DC / DC converter output reverse connection detection device, which can be implemented by software and / or hardware. Figure 1 As shown, the method includes:

[0048] S110 , obtaining a voltage signal at the positive output terminal of the DC / DC converter.

[0049] A DC / DC converter is a voltage converter that transforms input voltage and effectively outputs a fixed voltage. A DC / DC converter includes an input terminal and an output terminal. The DC / DC converter converts the input voltage into a stable output voltage, where the output terminal includes a positive output terminal and a negative output terminal. The DC / DC converter also includes a low-voltage power supply terminal. The low-voltage power supply terminal of the DC / DC converter is connected to a low-voltage power supply to power the DC / DC converter, enabling the DC / DC converter to perform voltage conversion. The voltage at the low-voltage power supply terminal is generally 12V. The DC / DC converter also includes a main control unit, which can control the normal operation of the DC / DC converter and convert the input voltage into a stable output voltage.

[0050] S120 : Determine an output reverse connection detection result of the DC / DC converter according to the acquired voltage signal.

[0051] Specifically, the voltage signal at the positive output terminal of the DC / DC converter can be used to determine whether the output terminal of the DC / DC converter is reversely connected, thereby obtaining a detection result. The output reverse connection detection result includes whether the output terminal of the DC / DC converter is reversely connected or whether the output terminal of the DC / DC converter is normally connected.

[0052] S130 : Controlling the DC / DC converter to be turned on or off based on the output reverse connection detection result.

[0053] Specifically, when the output reverse connection detection result shows that the output terminal of the DC / DC converter is reversely connected, the DC / DC converter is controlled to be turned off, that is, the DC / DC converter is controlled to stop working, and the DC / DC converter no longer converts the voltage at the input terminal into a stable voltage at the output terminal; when the output reverse connection detection result shows that the output terminal of the DC / DC converter is connected normally, the DC / DC converter is controlled to be turned on, that is, the DC / DC converter is controlled to work normally.

[0054] For example, a DC / DC converter can convert the high voltage electricity (generally 380V-400V) of the power battery pack in an electric vehicle into low voltage electricity (generally 11V-13V) to power the various module circuits inside the electric vehicle. It can also power the low-voltage battery of the electric vehicle. The positive output terminal of the DC / DC converter is connected to the positive pole of the low-voltage battery, and the negative output terminal of the DC / DC converter is connected to the negative pole of the low-voltage battery or the vehicle body ground; the DC / DC converter also requires electricity, and the power demand of the DC / DC converter is provided by the low-voltage battery. When the DC / DC converter fails or the DC / DC converter is not enabled and the in-vehicle entertainment system is used for a long time, causing the low-voltage battery to be depleted, an external low-voltage power supply needs to be connected to the output end of the DC / DC converter (that is, connected to the low-voltage battery). If the external low-voltage power supply is reversely connected to the output end of the DC / DC converter, the output connection status of the DC / DC converter can be judged by obtaining the voltage signal of the positive output end of the DC / DC converter. If the output end of the DC / DC converter is reversed, the DC / DC converter is controlled to stop working to prevent the external low-voltage power supply from damaging the internal power devices of the DC / DC converter; if the output end of the DC / DC converter is connected normally, the DC / DC converter is controlled to operate normally.

[0055] An embodiment of the present invention provides a method for detecting reverse connection of a DC / DC converter output. By acquiring a voltage signal at the positive output terminal of the DC / DC converter, the connection status of the output terminal of the DC / DC converter is determined, and the DC / DC converter is controlled to be turned on or off according to the connection status of the output terminal of the DC / DC converter. When the output terminal of the DC / DC converter is reverse connected, the reverse connection of the output terminal of the DC / DC converter can be detected in a timely manner and the DC / DC converter can be controlled to stop operation, thereby preventing an external low-voltage power supply from damaging the internal power devices of the DC / DC converter and avoiding damage to the DC / DC converter due to improper operation.

[0056] Optionally, the DC / DC converter further includes a bus interface terminal; and before obtaining the voltage signal at the positive output terminal of the DC / DC converter, the method includes obtaining message information sent by the vehicle controller through the bus interface terminal, wherein the message information includes a start-up instruction for the DC / DC converter.

[0057] Exemplarily, the bus interface is connected to a vehicle controller via a vehicle bus, which can transmit message information. After the vehicle controller receives a vehicle driving instruction from an operator, it issues a start instruction to turn on the DC / DC converter. The DC / DC converter output reverse connection detection device then obtains a voltage signal at the positive output terminal of the DC / DC converter, determines the connection status of the DC / DC converter's output terminal, and controls the DC / DC converter's on / off state.

[0058] It should be noted that the DC / DC converter does not perform voltage conversion until it is determined that the output terminal of the DC / DC converter is properly connected. However, the DC / DC converter can internally perform reverse polarity detection of the DC / DC converter output. When the DC / DC converter output terminal is detected to be properly connected, the DC / DC converter begins normal operation, converting the input voltage to a stable output voltage. If the output terminal of the DC / DC converter is reversed, the DC / DC converter does not proceed with the normal operation process, that is, it does not perform voltage conversion. However, the DC / DC converter can still internally perform reverse polarity detection of the DC / DC converter output. The reverse polarity of the DC / DC converter output does not affect the DC / DC converter output reverse polarity detection.

[0059] Optionally, before obtaining the voltage signal of the positive output terminal of the DC / DC converter, the low-voltage power supply terminal of the DC / DC converter is powered on.

[0060] Specifically, when the low-voltage power supply end is powered on, the electrical signal of the low-voltage power supply end can be provided to the DC / DC converter output reverse connection detection device, and the DC / DC converter output reverse connection detection device can perform DC / DC converter output reverse connection detection after being powered on.

[0061] Optional, Figure 2 FIG. 1 is a flow chart of another method for detecting reverse connection of a DC / DC converter output provided by an embodiment of the present invention. Figure 2 As shown, the method includes:

[0062] S210 : Acquire a voltage signal at the positive output terminal of the DC / DC converter.

[0063] S220: Determine whether the acquired voltage signal is less than zero. If so, execute S230; if not, execute S250.

[0064] S230 , determining whether the output terminal of the DC / DC converter is reversely connected.

[0065] S240: Control the DC / DC converter to stop working.

[0066] S250: Determine whether the output terminal of the DC / DC converter is connected normally.

[0067] S260, controlling the DC / DC converter to operate normally.

[0068] For example, when the voltage signal at the positive output terminal of the DC / DC converter is less than zero, it can be determined that the output terminal of the DC / DC converter is reversely connected. At this time, the working circuit inside the DC / DC converter is controlled to remain in a disconnected state, and the power devices inside the DC / DC converter can refuse to receive electrical signals from the external power supply, thereby protecting the DC / DC converter from damage; when the voltage signal at the positive output terminal of the DC / DC converter is greater than or equal to zero, it can be determined that the output terminal of the DC / DC converter is normally connected. At this time, the working circuit inside the DC / DC converter can be controlled from a disconnected state to a conductive state, and the DC / DC converter can operate normally and convert the voltage at the input terminal into a stable voltage at the output terminal.

[0069] Optional, Figure 3 FIG. 1 is a flow chart of another method for detecting reverse connection of a DC / DC converter output provided by an embodiment of the present invention. Figure 3 As shown, the method includes:

[0070] S310 : Acquire a voltage signal at the positive output terminal of the DC / DC converter.

[0071] S320: Determine whether the acquired voltage signal is less than zero. If so, execute S330; if not, execute S350.

[0072] S330, determining whether the output terminal of the DC / DC converter is reversely connected;

[0073] S340: Control the DC / DC converter to stop working, and store the information that the output terminal of the DC / DC converter is reversely connected. Return to S320.

[0074] Exemplarily, when it is determined that the output terminal of a DC / DC converter is reversely connected, the operating circuit inside the DC / DC converter is controlled to remain disconnected, so that the power devices inside the DC / DC converter can refuse to receive electrical signals from the external power supply, thereby protecting the DC / DC converter from damage. Simultaneously, information about the reverse connection of the output terminal of the DC / DC converter is stored, and / or information about the reverse connection of the output terminal of the DC / DC converter is promptly uploaded, so that when the DC / DC converter is not working, the operator can promptly learn the reason why the DC / DC converter is not working. After storing and / or uploading the information about the reverse connection of the output terminal of the DC / DC converter, the operator returns to the step of determining whether the acquired voltage signal is less than zero. After discovering the reason why the DC / DC converter is not working, the operator connects the output terminal of the DC / DC converter in a positive direction. At this time, the voltage signal at the positive output terminal of the DC / DC converter is greater than zero, confirming that the output terminal of the DC / DC converter is properly connected, and controlling the DC / DC converter to operate normally. There is no need to restart the DC / DC converter output reverse connection detection device, resulting in high detection efficiency.

[0075] In an embodiment of the present invention, by acquiring a voltage signal at the positive output terminal of a DC / DC converter, the connection status of the output terminal of the DC / DC converter is determined, and the DC / DC converter is controlled to be turned on or off according to the connection status of the output terminal of the DC / DC converter. When the output terminal of the DC / DC converter is reversely connected, the reverse connection of the output terminal of the DC / DC converter can be detected in a timely manner and the DC / DC converter can be controlled to stop working, thereby preventing an external low-voltage power supply from damaging power devices inside the DC / DC converter and protecting the DC / DC converter from damage during improper operation. Furthermore, when the output terminal of the DC / DC converter is reversely connected, the information of the reverse connection of the output terminal of the DC / DC converter is stored, so that an operator can quickly locate the cause of the DC / DC converter failure when the DC / DC converter does not work, which greatly helps after-sales maintenance, problem location, and the like.

[0076] Based on the same inventive concept, an embodiment of the present invention further provides a DC / DC converter output reverse connection detection device. Figure 4 This is a structural block diagram of a DC / DC converter output reverse connection detection device provided by an embodiment of the present invention. The device can be implemented by software and / or hardware and is generally integrated in a mobile terminal. Figure 4 As shown, the device may include:

[0077] A voltage acquisition module 410 is configured to acquire a voltage signal at the positive output terminal of the DC / DC converter;

[0078] A result analysis module 420 is configured to determine an output reverse connection detection result of the DC / DC converter based on the acquired voltage signal;

[0079] The control module 430 is configured to control the DC / DC converter to be turned on or off based on the output reverse connection detection result.

[0080] An embodiment of the present invention provides a DC / DC converter output reverse connection detection device, which can prevent the DC / DC converter from being damaged due to improper operation; and can enable operators to quickly locate the cause of the DC / DC converter failure when the DC / DC converter is not working, which greatly helps after-sales maintenance, problem location, etc.

[0081] Of course, the modules included in the DC / DC converter output reverse connection detection device provided in the embodiment of the present invention are not limited to the modules of the DC / DC converter output reverse connection detection device described above, and may also include the relevant device structures in the DC / DC converter output reverse connection detection method provided in any embodiment of the present invention.

[0082] Based on the same inventive concept, an embodiment of the present invention further provides a DC / DC converter, Figure 5 This is a system block diagram of a DC / DC converter provided by an embodiment of the present invention. Figure 5 As shown, the DC / DC converter 500 includes a main control unit 510, an isolated power conversion unit 520, a voltage sampling unit 530, a high-voltage input terminal 501, an output terminal 502, and a low-voltage power supply terminal 503. The output terminal 502 includes a positive output terminal 5021 and a negative output terminal 5022. The main control unit 510 can implement any of the DC / DC converter output reverse connection detection methods of the embodiments of the present invention.

[0083] Continue to refer Figure 5 The main control unit 510 is connected to the isolated power conversion unit 520, the voltage sampling unit 530 and the low-voltage power supply terminal 503 respectively; the isolated power conversion unit 520 is connected to the high-voltage input terminal 501 and the output terminal 502. Specifically, the first input terminal of the main control unit 510 is connected to the low-voltage power supply terminal 503, and the low-voltage power supply terminal 503 is also connected to the voltage sampling unit 530. The low-voltage power supply terminal 503 provides an electrical signal to the main control unit 510 and the voltage sampling unit 530; the first output terminal of the main control unit 510 is connected to the isolated power conversion unit 520, and the main control unit 510 outputs a control signal to the isolated power conversion unit 520; the second input terminal of the main control unit 510 is connected to the voltage sampling unit 530, and the voltage sampling unit 530 is connected to the positive output terminal 5021. The voltage sampling unit 530 can collect the voltage signal of the positive output terminal 5021 and transmit the collected voltage signal to the main control unit 510.

[0084] Exemplarily, the high-voltage input terminal 501 can be connected to the power battery of an electric vehicle, and the DC / DC converter 500 can convert the high-voltage electricity input from the power battery into low-voltage electricity, which is output from the output terminal 502. The output terminal 502 can be connected to the battery of an electric vehicle, and the low-voltage electricity output by the output terminal 502 can be provided to the battery for charging. The low-voltage power supply terminal 503 can be connected to the battery, and the low-voltage electricity in the battery can be provided to the main control unit 510 and the voltage sampling unit 530 in the DC / DC converter 500. It should be noted that the low-voltage power supply terminal 503 is not limited to being connected only to the battery. When the battery is low on power or fails, the low-voltage power supply terminal 50 can also be connected to other low-voltage power sources to ensure the power demand of the DC / DC converter 500.

[0085] In an embodiment of the present invention, a main control unit, an isolated power conversion unit, a voltage sampling unit, a high-voltage input terminal, an output terminal, and a low-voltage power supply terminal are provided in a DC / DC converter, so that high voltage electricity at the high-voltage input terminal can be converted into low voltage electricity at the output terminal, and the voltage sampling unit can collect the voltage signal of the positive output terminal of the DC / DC converter. The main control unit can determine the connection status of the output terminal based on the voltage signal of the positive output terminal collected by the voltage sampling unit, and control whether the isolated power conversion unit works or not based on the connection status of the output terminal. The main control unit can also record and upload status information of the output terminal, so that the operator can quickly locate the cause of the DC / DC converter failure when the DC / DC converter does not work, which provides great help for after-sales maintenance, problem location, and the like.

[0086] Optional, Figure 6 This is another system block diagram of a DC / DC converter provided by an embodiment of the present invention. Figure 6 As shown, the DC / DC converter 500 further includes a positive and negative voltage power supply unit 540. The input terminals of the positive and negative voltage power supply unit 540 are connected to the low-voltage power supply terminal 503, and the main control unit 510 and the voltage sampling unit 530 are both connected to the output terminals of the positive and negative voltage power supply unit 540. The positive and negative voltage power supply unit 540 is used to receive the electrical signal provided by the low-voltage power supply terminal 503 and to supply power to the main control unit 510 and the voltage sampling unit 530.

[0087] Specifically, the electrical signal from the low-voltage power supply terminal 503 is provided to the main control unit 510 and the voltage sampling unit 530 after passing through the positive and negative voltage power supply unit 540. When the electrical signal from the low-voltage power supply terminal 503 is positive, the positive and negative voltage power supply unit 540 can provide a positive electrical signal to the main control unit 510 and the voltage sampling unit 530; when the electrical signal from the low-voltage power supply terminal 503 is negative, the positive and negative voltage power supply unit 540 can convert the electrical signal from the low-voltage power supply terminal 503 into a positive electrical signal and still provide a positive electrical signal to the main control unit 510 and the voltage sampling unit 530.

[0088] Exemplarily, the output terminal 502 is connected to the battery, and the low-voltage power supply terminal 503 is also connected to the battery. When the DC / DC converter 500 fails or the battery is low on power, the external low-voltage power supply is connected to the output terminal 502 of the DC / DC converter 500 (i.e., connected to the low-voltage battery). If the external low-voltage power supply is reversely connected to the output terminal of the DC / DC converter, the low-voltage power supply terminal 503 is also reversely connected, and the electrical signal provided by the low-voltage power supply terminal 503 is negative. By setting a positive and negative voltage power supply unit 540 in the DC / DC converter 500, the positive and negative voltage power supply unit 540 always outputs a positive electrical signal. When the external low-voltage power supply is reversely connected to the output terminal 502 of the DC / DC converter 500, the power demand of the DC / DC converter 500 can still be guaranteed, and the connection status of the output terminal 502 of the DC / DC converter 500 can still be detected when the low-voltage power supply port is reversed.

[0089] Optional, Figure 7 FIG. 1 is a schematic diagram of a circuit structure of a positive and negative voltage power supply unit provided by an embodiment of the present invention. Figure 7 As shown, the positive and negative voltage power supply unit includes a single-phase bridge rectifier circuit. The positive and negative voltage power supply unit also includes an input terminal 541 and an output terminal 542. The input terminal 541 is connected to the low-voltage power supply terminal 503, and the output terminal 542 is connected to the main control unit 510 and the voltage sampling unit 530. Regardless of whether the electrical signal at the input terminal 541 is positive or negative, the electrical signal at the output terminal 542 is always positive. It should be noted that the circuit structure of the positive and negative voltage power supply unit is not limited to a single-phase bridge rectifier circuit and can also include other components to achieve the same function.

[0090] Continue to refer Figure 6 The DC / DC converter 500 further includes a transceiver unit 550 and a bus interface terminal 504. The transceiver unit 550 is connected to the main control unit 510, the positive and negative voltage supply unit 540, and the bus interface terminal 504 respectively; the positive and negative voltage supply unit 540 is also used to supply power to the transceiver unit 550; and message information between the bus interface terminal 505 and the main control unit 510 is exchanged via the transceiver unit 550.

[0091] For example, the vehicle controller of the car can send a message information of the start-up instruction of the DC / DC converter 500, and the message information is transmitted to the bus interface terminal 504 via the vehicle bus. The DC / DC converter 500 is internally provided with a transceiver unit 550, which can receive and parse the message information of the bus interface terminal 504, and then pass it to the main control unit 510; the information stored in the main control unit 510 can be converted into message information via the transceiver unit 550, output via the bus interface terminal 504, and then transmitted to the vehicle controller or display and other devices of the car via the vehicle bus.

[0092] It should be understood that the illustrated DC / DC converter 500 is merely an example, and the DC / DC converter 500 may have more or fewer components than shown in the figure, may combine two or more components, or may have different component configurations. The various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application specific integrated circuits.

[0093] The DC / DC converter provided by the embodiments of the present invention can protect the DC / DC converter from damage during improper operation and can enable operators to quickly locate the cause of the DC / DC converter failure when the DC / DC converter is not working, which greatly helps after-sales maintenance, problem location, and other work.

[0094] The DC / DC converter output reverse connection detection device and DC / DC converter provided in the above embodiments can implement the DC / DC converter output reverse connection detection method provided in any embodiment of the present invention, and have the corresponding functional modules and beneficial effects of executing the method. For technical details not fully described in the above embodiments, please refer to the DC / DC converter output reverse connection detection method provided in any embodiment of the present invention.

[0095] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for detecting reverse connection of a DC / DC converter output, wherein the DC / DC converter comprises a main control unit, an output terminal, and a low-voltage power supply terminal, characterized in that: include: Acquiring a voltage signal at the positive output terminal of the DC / DC converter; determining an output reverse connection detection result of the DC / DC converter according to the acquired voltage signal; Based on the output reverse connection detection result, controlling the DC / DC converter to be turned on or off; Wherein, determining the output reverse connection detection result of the DC / DC converter according to the acquired voltage signal includes: Determining whether the acquired voltage signal is less than zero; If the voltage signal is less than zero, determining that the output terminal of the DC / DC converter is reversely connected; If the voltage signal is greater than or equal to zero, it is determined that the output terminal of the DC / DC converter is connected normally; Wherein, when the output terminal of the DC / DC converter is reversely connected, the DC / DC converter continues to perform the DC / DC converter output reverse connection detection inside the DC / DC converter; The DC / DC converter further includes a positive and negative voltage power supply unit and a voltage sampling unit. The positive and negative voltage power supply unit is used to receive the electrical signal from the low voltage power supply end and always provide a positive electrical signal to the main control unit and the voltage sampling unit.

2. The DC / DC converter output reverse connection detection method according to claim 1, characterized in that: The DC / DC converter further includes a bus interface terminal; before obtaining the voltage signal of the positive output terminal of the DC / DC converter, the method includes: The message information sent by the vehicle controller is obtained through the bus interface end; wherein the message information includes a start-up instruction of the DC / DC converter.

3. The DC / DC converter output reverse connection detection method according to claim 1, characterized in that: Before obtaining the voltage signal of the positive output terminal of the DC / DC converter, the method includes: The low-voltage power supply end of the DC / DC converter is powered on.

4. The DC / DC converter output reverse connection detection method according to claim 1, characterized in that: Controlling the DC / DC converter to be turned on or off based on the output reverse connection detection result includes: If the output terminal of the DC / DC converter is reversely connected, the DC / DC converter is controlled to stop working; If the output end of the DC / DC converter is connected normally, the DC / DC converter is controlled to operate normally.

5. The DC / DC converter output reverse connection detection method according to claim 1, characterized in that: Controlling the DC / DC converter to be turned on or off based on the output reverse connection detection result includes: If the output terminal of the DC / DC converter is reversely connected, controlling the DC / DC converter to stop working and storing information that the output terminal of the DC / DC converter is reversely connected; Return to the step of determining whether the acquired voltage signal is less than zero.

6. A DC / DC converter output reverse connection detection device, characterized in that: include: A voltage acquisition module, configured to acquire a voltage signal at the positive output terminal of the DC / DC converter; a result analysis module, configured to determine an output reverse connection detection result of the DC / DC converter according to the acquired voltage signal; A control module, configured to control the DC / DC converter to be turned on or off based on the output reverse connection detection result; The result analysis module is further configured to determine whether the obtained voltage signal is less than zero; if the voltage signal is less than zero, determining that the output terminal of the DC / DC converter is reversely connected; If the voltage signal is greater than or equal to zero, it is determined that the output terminal of the DC / DC converter is connected normally. When the output terminal of the DC / DC converter is reversely connected, the DC / DC converter continues to perform the DC / DC converter output reverse connection detection inside.

7. A DC / DC converter, characterized in that: include: Main control unit, isolated power conversion unit, voltage sampling unit, high voltage input terminal, output terminal and low voltage power supply terminal; The main control unit is connected to the isolated power conversion unit, the voltage sampling unit and the low-voltage power supply end respectively; the isolated power conversion unit is connected to the high-voltage input end and the output end; The output end includes a positive output end and a negative output end, the positive output end is connected to the voltage sampling unit; the voltage sampling unit is connected to the low-voltage power supply end; The main control unit implements the DC / DC converter output reverse connection detection method according to any one of claims 1 to 5.

8. The DC / DC converter according to claim 7, characterized in that: Also included: a positive and negative voltage power supply unit; The input end of the positive and negative voltage power supply unit is connected to the low voltage power supply end, and the main control unit and the voltage sampling unit are both connected to the output end of the positive and negative voltage power supply unit; The positive and negative voltage power supply unit is used to receive the electrical signal provided by the low voltage power supply end and supply power to the main control unit and the voltage sampling unit.

9. The DC / DC converter according to claim 8, characterized in that: Also includes: transceiver unit and bus interface end; The transceiver unit is connected to the main control unit, the positive and negative voltage power supply unit and the bus interface terminal respectively; The positive and negative voltage power supply unit is also used to supply power to the transceiver unit; the message information between the bus interface end and the main control unit is exchanged via the transceiver unit.

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