CN111490524A - DCDC converter with security level of ASI L B - Google Patents
DCDC converter with security level of ASI L B Download PDFInfo
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- CN111490524A CN111490524A CN202010431355.1A CN202010431355A CN111490524A CN 111490524 A CN111490524 A CN 111490524A CN 202010431355 A CN202010431355 A CN 202010431355A CN 111490524 A CN111490524 A CN 111490524A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Dc-Dc Converters (AREA)
Abstract
The invention provides a DCDC converter based on ASI L B with safety class, which comprises a high-voltage input processing module, a DCDC conversion module connection, an output processing module, an output fault diagnosis module, a safety control module conversion and MCU processing unit which are sequentially and electrically connected, wherein the MCU processing unit is also connected with a change-over switch control module, the output of the change-over switch control module is connected with the DCDC conversion module, and the output of the safety control module is also connected with the change-over switch control module.
Description
Technical Field
The invention belongs to the technical field of automotive electronics, and particularly relates to a DCDC converter with security level of ASI L B.
Background
With the development of new energy vehicles, pure electric vehicles are more and more popular for people, and the number of electronic control systems contained in the whole vehicle is rapidly increased, so that the functional safety of an electronic system of the vehicle is more and more critical. The DCDC converter is also the core in the low-voltage power supply system of the whole vehicle, and the functional safety of the DCDC converter is very important.
Aiming at a DCDC power supply system of a pure electric vehicle, when the output of the DCDC power supply system is in overvoltage, undervoltage or overcurrent, the low-voltage power supply of the whole vehicle is abnormal, and the whole vehicle is damaged by ASI L B (ASI L: automatic safety integrity level of the vehicle is divided into A, B, C and D).
Disclosure of Invention
To solve the above problem, a DCDC converter based on the safety class ASI L B is provided.
The object of the invention is achieved in the following way:
a DCDC converter with the safety level of ASI L B comprises a high-voltage input processing module, a DCDC conversion module connection, an output processing module, an output fault diagnosis module, a safety control module conversion and MCU processing unit which are sequentially and electrically connected, wherein the MCU processing unit is also connected with a change-over switch control module, the output of the change-over switch control module is connected to the DCDC conversion module, and the output of the safety control module is also connected with the change-over switch control module.
The DCDC converter further comprises an input fault diagnosis module, wherein the input of the input fault diagnosis module is connected with the high-voltage input processing module, and the output of the input fault diagnosis module is connected with the MCU processing unit; the input fault diagnosis module comprises a voltage detection circuit and a current detection circuit.
The high-voltage input processing module comprises an EMC filter circuit and is used for filtering and EMC processing the input high-voltage direct-current power supply.
And the output processing module outputs the low-voltage direct-current power supply converted by the DCDC conversion module to a whole vehicle low-voltage power supply network through an output port.
The output fault diagnosis module comprises a voltage detection circuit and a current detection circuit.
The conversion switch control module comprises a phase-shifted full-bridge control chip connected with the MCU processing unit, a primary side MOS drive chip and a secondary side MOS drive chip which are respectively connected with the output of the phase-shifted full-bridge control chip, wherein the output of the primary side MOS drive chip is respectively connected with the grid electrode of the primary side MOS tube and is used for driving the on-off of the switch of the primary side MOS tube of the transformer in the DCDC conversion module; and the output of the secondary side MOS driving chip is respectively connected with the grid electrode of the secondary side MOS tube and is used for driving the on-off of the switch of the secondary side MOS tube of the transformer in the DCDC conversion module.
The safety control module comprises an overcurrent comparison circuit, an overvoltage comparison circuit and an undervoltage comparison circuit, wherein the overvoltage comparison circuit and the undervoltage comparison circuit generate overvoltage detection signals and undervoltage detection signals and output control enabling signals for a primary side MOS driving chip and a secondary side MOS driving chip in the change-over switch control module; the over-current comparison circuit is used for generating an over-current detection signal and outputting and controlling the enabling of a primary side MOS driving chip and a secondary side MOS driving chip in the conversion switch control module of the safety control module.
The invention has the beneficial effects that: compared with the prior art, when the output of the DC power supply fails, the DCDC enters a safe state (non-working) through the fault diagnosis and safety control module, so that the influence of the DCDC on other power utilization systems is avoided, and the reliability is improved. The DCDC converter not only meets the requirement (independence) of ISO26262 on the safety level of the system, but also uses a complete hardware module to realize the safety mechanism part, so that the safety mechanism runs more quickly and reliably, and the system is safer.
Drawings
Fig. 1 is a schematic diagram of a DCDC converter system architecture according to the present invention.
Fig. 2 is a functional block diagram of the DCDC conversion system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As shown in FIG. 1, the DCDC converter based on the ASI L B with the safety level comprises a high-voltage input processing module, a DCDC conversion module connection, an output processing module, an output fault diagnosis module, a safety control module conversion unit and an MCU processing unit which are sequentially and electrically connected, wherein the MCU processing unit is also connected with a conversion switch control module, the output of the conversion switch control module is connected to the DCDC conversion module, and the output of the safety control module is also connected with the conversion switch control module.
As shown in fig. 2, the DCDC converter further includes an input fault diagnosis module, an input of the input fault diagnosis module is connected to the high voltage input processing module, and an output of the input fault diagnosis module is connected to the MCU processing unit; the input fault diagnosis module comprises a voltage detection circuit and a current detection circuit, and is used for collecting the current value of the input high-voltage power supply and transmitting the current value to the MCU processing unit. The voltage detection circuit and the current detection circuit in the high-voltage input fault diagnosis module are both circuits in the prior art.
The high-voltage input processing module comprises an EMC filter circuit, and the input high-voltage direct current power supply is filtered and EMC processed and then transmitted to the input end of the DCDC conversion module.
The DCDC conversion module is a full-bridge conversion module with synchronous rectification, and comprises a transformer, 4 power switch tubes on the primary side of the transformer and a MOSFET synchronous rectification circuit connected with the output of the secondary side of the transformer, wherein the MOSFET synchronous rectification circuit comprises six identical MOSFETs which are connected into a three-phase full-bridge rectification circuit, namely each MOSFET replaces a rectifier diode.
And the output processing module outputs the low-voltage direct-current power supply converted by the DCDC conversion module to a whole vehicle low-voltage power supply network through an output port.
The output fault diagnosis module comprises a voltage detection circuit and a current detection circuit.
The conversion switch control module comprises a phase-shifted full-bridge control chip connected with the MCU processing unit, a primary side MOS drive chip and a secondary side MOS drive chip which are respectively connected with the output of the phase-shifted full-bridge control chip, wherein the output of the primary side MOS drive chip is respectively connected with the grid electrode of the primary side MOS tube and is used for driving the on-off of the switch of the primary side MOS tube of the transformer in the DCDC conversion module; and the output of the secondary side MOS driving chip is respectively connected with the grid electrode of the secondary side MOS tube and is used for driving the on-off of the switch of the secondary side MOS tube of the transformer in the DCDC conversion module.
The safety control module comprises an overcurrent comparison circuit, an overvoltage comparison circuit and an undervoltage comparison circuit, wherein the overvoltage comparison circuit and the undervoltage comparison circuit generate overvoltage detection signals and undervoltage detection signals and output control enabling signals for a primary side MOS driving chip and a secondary side MOS driving chip in the change-over switch control module; the over-current comparison circuit is used for generating an over-current detection signal and outputting and controlling the enabling of a primary side MOS driving chip and a secondary side MOS driving chip in the change-over switch control module.
The over-current detection signal OCS, the over-voltage detection signal OVS and the under-voltage detection signal UVS output by the over-current comparison circuit, the over-voltage comparison circuit and the under-voltage comparison circuit are high-level signals, and can drive one switch control circuit, convert the high-level signals into low levels and transmit the low levels to an enable end of a primary side MOS drive chip and an enable end of a secondary side MOS drive chip in the control conversion switch control module. The switch control circuit converts three input signals into one output signal and controls the enabling of the MOS driving chip to be closed, the switch control circuit comprises three MOSFET power tubes which are connected in parallel, grid electrodes G of the three MOSFET power tubes are respectively connected with an overcurrent detection signal OCS, an overvoltage detection signal OVS and an undervoltage detection signal UVS, drain electrodes D of the three MOSFET power tubes are connected with a power supply through pull-up resistors, source electrodes S of the three MOSFET power tubes are grounded, and a resistor is connected in series between the grid electrodes G and the source electrodes S of the three MOSFET power tubes, so that the turn-on voltage is improved.
The working principle of the invention is that an input high-voltage direct current power supply is filtered and EMC processed by a high-voltage input processing module and then is sent to a DCDC conversion module to carry out conversion from high-voltage direct current to low-voltage direct current, a converted output power supply is processed by an output processing module and then is output to a low-voltage power supply network of the whole vehicle from an output port, an output fault diagnosis module carries out voltage and current detection on the output low-voltage power supply, a safety control module comprises an overcurrent comparison circuit, an overvoltage comparison circuit and an undervoltage comparison circuit to carry out overvoltage, undervoltage and overcurrent fault diagnosis on the output low-voltage power supply, once a fault occurs, the safety control module is triggered to work to send enabling closing signals to enabling ends of a primary side MOS drive chip and a secondary side MOS drive chip in a conversion switch control module to enable the DCDC converter to enter a safety state (non-working), a ⑧ input fault diagnosis module acquires voltage and current values of the input high-voltage power supply and inputs acquired AD values to a ⑤ MCU processing unit to judge whether the input undervoltage, overvoltage, if an undervoltage, ⑤ or overcurrent fault occurs, the conversion processing unit controls the switching module to enable the secondary side MOS drive the secondary side MOS chip to enable the secondary side to enable the MCU processing unit to enable the secondary side to enable the secondary.
When the output of the DC power supply fails, the DCDC enters a safe state (non-working) through the fault diagnosis and safety control module, so that the influence of the DCDC on other power utilization systems is avoided, and the reliability is improved. The DCDC converter not only meets the requirement of ISO26262 on the safety level of the system, but also uses a complete hardware module to realize the safety mechanism part, so that the safety mechanism runs more quickly and reliably, and the system is safer.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A DCDC converter with the safety level of ASI L B is characterized by comprising a high-voltage input processing module, a DCDC conversion module connection, an output processing module, an output fault diagnosis module, a safety control module conversion unit and an MCU processing unit which are sequentially and electrically connected, wherein the MCU processing unit is also connected with a conversion switch control module, the output of the conversion switch control module is connected to the DCDC conversion module, and the output of the safety control module is also connected with the conversion switch control module.
2. The DCDC converter based on the ASI L B with the safety level as claimed in claim 1, further comprising an input fault diagnosis module, wherein the input of the input fault diagnosis module is connected with the high voltage input processing module, the output of the input fault diagnosis module is connected with the MCU processing unit, and the input fault diagnosis module comprises a voltage detection circuit and a current detection circuit.
3. The DCDC converter based on ASI L B as claimed in claim 1, wherein the high voltage input processing module includes an EMC filter circuit for filtering and EMC processing the input high voltage DC power.
4. The DCDC converter based on the ASI L B with the safety level as claimed in claim 1, wherein the output processing module outputs the low-voltage DC power converted by the DCDC conversion module to the whole vehicle low-voltage power supply network through an output port.
5. The DCDC converter with safety level ASI L B as claimed in claim 1, wherein the output fault diagnosis module comprises a voltage detection circuit and a current detection circuit.
6. The DCDC converter based on the security class of ASI L B as claimed in claim 1, wherein the conversion switch control module comprises a phase-shifted full-bridge control chip connected to the MCU processing unit, a primary side MOS driver chip and a secondary side MOS driver chip respectively connected to the output of the phase-shifted full-bridge control chip, the output of the primary side MOS driver chip is respectively connected to the gate of the primary side MOS transistor for driving the on-off of the primary side MOS transistor switch of the transformer in the DCDC conversion module, and the output of the secondary side MOS driver chip is respectively connected to the gate of the secondary side MOS transistor for driving the on-off of the secondary side MOS transistor switch of the transformer in the DCDC conversion module.
7. The DCDC converter with the safety class of ASI L B as claimed in claim 1, wherein the safety control module comprises an over-current comparison circuit, an over-voltage comparison circuit and an under-voltage comparison circuit, the over-voltage comparison circuit and the under-voltage comparison circuit generate an over-voltage detection signal and an under-voltage detection signal to output the enable of the primary side MOS driving chip and the secondary side MOS driving chip in the change-over switch control module, and the over-current comparison circuit is used for generating an over-current detection signal to output the enable of the primary side MOS driving chip and the secondary side MOS driving chip in the change-over switch control module in the safety control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010431355.1A CN111490524A (en) | 2020-05-20 | 2020-05-20 | DCDC converter with security level of ASI L B |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010431355.1A CN111490524A (en) | 2020-05-20 | 2020-05-20 | DCDC converter with security level of ASI L B |
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| CN111490524A true CN111490524A (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010431355.1A Pending CN111490524A (en) | 2020-05-20 | 2020-05-20 | DCDC converter with security level of ASI L B |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295919A (en) * | 2021-05-11 | 2021-08-24 | 联合汽车电子有限公司 | Signal detection circuit, DC/DC converter, detection method, and storage medium |
| CN114655145A (en) * | 2020-12-24 | 2022-06-24 | 上海汽车集团股份有限公司 | Power supply method of domain controller and domain controller |
-
2020
- 2020-05-20 CN CN202010431355.1A patent/CN111490524A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114655145A (en) * | 2020-12-24 | 2022-06-24 | 上海汽车集团股份有限公司 | Power supply method of domain controller and domain controller |
| CN114655145B (en) * | 2020-12-24 | 2023-12-22 | 上海汽车集团股份有限公司 | Power supply method of domain controller and domain controller |
| CN113295919A (en) * | 2021-05-11 | 2021-08-24 | 联合汽车电子有限公司 | Signal detection circuit, DC/DC converter, detection method, and storage medium |
| CN113295919B (en) * | 2021-05-11 | 2024-04-16 | 联合汽车电子有限公司 | Signal detection circuit, DC/DC converter, detection method, and storage medium |
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Effective date of registration: 20220106 Address after: 450016 No. 9, Lanhu street, Jiulong office, economic and Technological Development Zone, Zhengzhou City, Henan Province Applicant after: ZHENGZHOU ZHIQU TECHNOLOGY Co.,Ltd. Address before: 450016 69 Eighth Avenue, Zhengzhou Economic and Technological Development Zone, Henan Province Applicant before: ZHENGZHOU JINGYIDA AUTO PARTS Co.,Ltd. |