CN113161999B - New energy automobile relay abnormity protection circuit - Google Patents
New energy automobile relay abnormity protection circuit Download PDFInfo
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- CN113161999B CN113161999B CN202110707416.7A CN202110707416A CN113161999B CN 113161999 B CN113161999 B CN 113161999B CN 202110707416 A CN202110707416 A CN 202110707416A CN 113161999 B CN113161999 B CN 113161999B
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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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—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 distribution gear, e.g. bus-bar systems; for switching devices for switches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a new energy automobile relay abnormity protection circuit which comprises a buck-boost chip, a buck chip, a high-side driving chip, a D-type trigger, an MCU main control chip, an ADC chip and an isolation chip, wherein a KL30 normal electric power supply is connected with the buck-boost chip, a 12V output of a VOUT pin is connected with the buck chip and the high-side driving chip, a 5V output of the VOUT pin is connected with the D-type trigger, the isolation chip and the ADC chip, and the MCU chip is connected with the D-type trigger.
Description
Technical Field
The invention relates to the technical field of new energy automobile battery management systems, in particular to a new energy automobile relay abnormity protection circuit.
Background
At present, most of existing new energy automobiles are driven by batteries, and the relays are used for controlling input and output of the batteries, so that control and detection of relay states are indispensable. The existing control and detection of the state of the relay are mostly realized by the following modes: firstly, judging the state of a relay by detecting the voltage at two ends of a relay coil; secondly, judging the state of the relay by detecting a high-voltage value at the rear end of the relay; thirdly, comprehensively judging by combining the voltages at two ends of the relay coil and the high voltage value at the rear end of the relay; although the relay state can be effectively controlled and detected by the above methods, when the voltage at two ends of the relay is unstable, the relay may be frequently closed or opened; in addition, when the chip for controlling the relay is abnormally reset and the like, the relay can be abnormally disconnected; in order to solve the problems, a novel relay abnormal protection circuit is provided, the circuit can control and detect the state of a relay, the possibility of abnormal disconnection and pull-in of the relay is effectively reduced through circuit design, and the harm caused by the abnormal disconnection and pull-in of the relay is reduced.
Disclosure of Invention
For solving above-mentioned problem, a new energy automobile relay is unusual protection circuit, the circuit includes buck-boost chip, buck chip, high limit driver chip, D type trigger, MCU master control chip, ADC chip and isolation chip, KL30 normal electric power connects buck-boost chip, 12V output connection buck chip and high limit driver chip of buck-boost chip VOUT pin, the stable 5V of VOUT pin output of buck chip, 5V output connection D type trigger, the isolation chip, MCU master control chip connects D type trigger.
As an improvement of the invention, a KL30 constant power supply is connected with the VINP and VINL pins of the TPS55165-Q1 chip, the PGND and GND pins are grounded, and the VOUT pin can output stable 12V.
As an improvement of the invention, a 12V OUTPUT is connected with a VCC pin of a high-side drive, an INPUT pin of a high-side drive chip is connected with a Q pin of a D-type trigger, a MultiSense pin of the high-side drive chip is connected with an ETPUA15 pin of an MCU, an OUTPUT pin of the high-side drive chip is connected with one end of a relay coil, and the other end of the relay coil is grounded.
As an improvement of the invention, when the output pin is at high level, the relay is closed, when the output pin is at low level, the relay is opened, the MultiSense pin of the high-side driving chip supports the diagnosis of the output voltage, whether 12V is output or not is judged, and the MCU collects information through the ETPUA15 pin.
As an improvement of the invention, the 5V output is connected with VCC, PRE and CLR pins of a D-type flip-flop, GND of the D-type flip-flop is grounded, CLK pin of the D-type flip-flop is connected with EMIOS30 pin of the MCU, and D pin of the D-type flip-flop is connected with EMIOS31 pin of the MCU.
As an improvement of the invention, the isolation chip is an ADUM5401W chip, the 5V output is connected with a VDD1 pin of the ADUM5401W chip, a GND1 pin is grounded, a VIA pin is connected with a PCSB2 pin of the MCU, a VIB pin is connected with a PCSB4 pin of the MCU, a VIC pin is connected with a PCSB1 pin of the MCU, a VOD pin is connected with a PCSB pin of the MCU, the isolation chip is communicated with the isolation SPI of the MCU, and the VSEL and the VISO are connected in parallel to output an isolated 5V power supply.
As an improvement of the invention, a 5V power supply of the isolation chip is connected with a VDD pin of the ADC chip, a GND pin is grounded, an SCLK pin is connected with a VOB pin of the isolation chip, and a CS pin is connected with a VOC pin of the isolation chip.
As an improvement of the invention, a DOUT/DRDY pin of an ADC chip is connected with a VID pin of an isolation chip, a DIN pin is connected with a VOA pin of the isolation chip to form SPI communication between the isolation chip and the ADC, and the MCU acquires a voltage value of a pair of negative electrodes through the SPI communication to judge whether the relay is adhered.
As an improvement of the invention, the MCU master control chip controls the CLK and the D pins of the D type flip-flop SN74LVC2G74-Q1, and the CLK is set at 5744P by software to keep high level during normal operation.
The invention has the beneficial effects that: the invention discloses a new energy automobile relay abnormal protection circuit, when the voltage at two ends of a relay coil is unstable in the running process of an automobile, a TPS55165-Q1 chip is added at the control front end of the relay coil, the chip can convert 2V-36V input voltage into 12V output to reduce the condition that the relay is disconnected due to the unstable input voltage, when MCU is abnormally reset, the coil voltage of the relay is kept in the last moment state through a D-type trigger to protect the circuit, when the state of the relay is detected, the relay is also protected, in the normal running process of the whole automobile, the condition that the relay is frequently attracted and disconnected due to the unstable power supply of a storage battery of the automobile is reduced, the condition that the relay is unexpectedly disconnected due to the abnormal reset of the MCU can also be reduced, thereby reducing the conditions of power interruption, vehicle body shake and the like in the running process of the vehicle; on the other hand, reducing the abnormal operation of the relay also prolongs the life of the relay.
Drawings
Fig. 1 is a block diagram of a protection circuit system according to the present invention.
FIG. 2 is a control flow chart of the protection circuit of the present invention.
FIG. 3 is a schematic diagram of AIN0 and point A circuit design according to the present invention.
Detailed Description
The present invention will be further illustrated with reference to the accompanying figures 1-3 and the following detailed description, which should be understood to illustrate the invention only and not to limit the scope of the invention.
Example (b): as shown in FIG. 1, the circuit comprises a buck-boost chip, a buck chip, a high-side driving chip, a D-type trigger, an MCU main control chip, an ADC chip and an isolation chip, wherein the buck-boost chip adopts TPS55165-Q1, the buck chip adopts TPS7B8150QDRVRQ1, the isolation chip adopts ADUM5401W, the high-side driving chip adopts VN7040AJ, the D-type trigger adopts SN74LVC2G74-Q1, the MCU main control chip adopts MPC5744P, the ADC chip adopts ADS1118-Q1, a KL30 constant power supply is connected with the buck-boost chip, the 12V output of a VOUT pin of the buck-boost chip is connected with the buck chip and the high-side driving chip, the VOUT pin of the buck chip outputs 5V, the 5V output of the buck chip is connected with the D-type chip and the main control chip is connected with the D chip.
The KL30 constant power supply is connected with the VINP and the VINL pins of the TPS55165-Q1 chip, the PGND and the GND pin are grounded, and the VOUT pin can output stable 12V.
The 12V OUTPUT of the buck-boost chip is connected with a VCC pin of a high-side driver, an INPUT pin of the high-side driver chip is connected with a Q pin of a D-type trigger, an ETPUA15 pin of the MCU is connected with a MultiSense pin of the high-side driver chip, an OUTPUT pin of the high-side driver chip is connected with one end of a relay coil, and the other end of the relay coil is grounded.
When the output pin is at high level, the relay is closed, when the output pin is at low level, the relay is opened, the MultiSense pin of the high-side driving VN7040AJ supports diagnosis of output voltage, whether 12V is output or not is judged, and the MCU acquires information through the ETPUA15 pin.
The 5V output of the buck chip is connected with pins VCC, PRE and CLR of the D-type flip-flop, the GND of the D-type flip-flop is grounded, the CLK pin of the D-type flip-flop is connected to the EMIOS30 pin of the MCU, and the D pin of the D-type flip-flop is connected to the EMIOS31 pin of the MCU.
The isolation chip is an ADUM5401W chip, the 5V output of the buck chip is connected with a VDD1 pin of the ADUM5401W chip, a GND1 pin is grounded, a VIA pin is connected with a PCSB2 pin of the MCU, a VIB pin is connected with a PCSB4 pin of the MCU, a VIC pin is connected with a PCSB1 pin of the MCU, a VOD pin is connected with a PCSB pin of the MCU, the isolation chip is communicated with the isolation SPI of the MCU to form an isolation SPI, and the VSEL and the VISO are connected in parallel to output an isolated 5V power supply.
The 5V power supply of the isolation chip is connected with a VDD pin of the ADC chip, a GND pin is grounded, an SCLK pin is connected with a VOB pin of the isolation chip, and a CS pin is connected with a VOC pin of the isolation chip.
The DOUT/DRDY pin of the ADC chip is connected with the VID pin of the isolation chip, the DIN pin is connected with the VOA pin of the isolation chip, and the isolation chip is communicated with the SPI of the ADC; the AIN0 and point A circuit design is shown in FIG. 3, wherein R3 and R4 type selection requires reference battery voltage U and sampling precision, the formula is that U × R4/(R3+ R4) is less than or equal to 5V, R3: R4 is more than or equal to (U-5):5, then R3 and R4 resistance values are selected to require reference sampling precision, and if the sampling precision is 0.001, R3 and R4 need to select k Ω -level resistance values.
The MCU master chip controls the CLK and D pins of the D-type flip-flop SN74LVC2G74-Q1, the CLK is set to be kept at a high level when the MPC5744P normally works through software, when the MPC5744P normally works, the level of the Q pin can be controlled by controlling the level of the D pin, when the MPC5744P abnormally resets and other faults occur, the CLK can be changed into a low level, a trigger truth table is inquired, as can be known from the following table 1, and at the moment, the Q output can be kept in a last time Q0 state.
TABLE 1
The working principle is as follows: when the vehicle is started, the TPS55165-Q1 chip converts the constant-current KL30 of the storage battery into stable 12V output through the buck-boost chip, and the possibility of abnormal action of the relay caused by instability of KL30 is reduced; after the high-side driver normally works, the output voltage is diagnosed through MultiSense, the MCU acquires a MultiSense voltage value U through AD and judges the working state of VN7040 AJ; after the isolation chip works normally, an isolated 5V power supply is output to work for the ADC, the ADC acquires A pair of negative electrode voltages, the isolation chip transmits information acquired by the ADC to the MCU through SPI communication, the MCU acquires the A pair of negative electrode voltages V and judges the state of the relay, the MCU outputs a high-voltage power-on and power-off instruction depending on a vehicle for a pin D, and the high-voltage power-on and power-off instruction is output by controlling Q so as to control high-side drive output and drive the relay to act; when the MCU is abnormally reset and other faults, the CLK pin is set to be at a low level due to the reset reason, the truth table of the D-type trigger is inquired, the Q can be obtained to maintain the state Q0 at the previous moment, the high-side driving state is unchanged, and the relay cannot be abnormally disconnected, so that the safety of the vehicle is ensured.
As shown in fig. 2, specifically, when the vehicle starts, the BMS operates normally, the MCU obtains the voltage V between a and the negative electrode of the battery, when V is greater than or equal to 20V, the BMS reports an error, when V is less than 20V, the MCU obtains MultiSense pin voltage U, when U is greater than or equal to 0.5V, the BMS reports an error, when U is less than 0.5V, the relay state is normal, the high-side drive output is normal, high-voltage is allowed to be applied, when a high-voltage instruction is received, the MCU gives a high level to the D pin of the D-type flip-flop, the high-side drive output is 12V, the relay operates in a closed state, and if the MCU resets abnormally, the relay maintains the previous state, and the vehicle operates normally.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various modifications can be made to the embodiments described in the foregoing embodiments, or some or all of the technical features of the embodiments can be equivalently replaced, and the modifications or the replacements do not make the essence of the corresponding technical solutions depart from the scope of the embodiments of the present invention.
Claims (5)
1. A novel energy automobile relay abnormity protection circuit is characterized by comprising a buck-boost chip, a buck chip, a high-side driving chip, a D-type trigger, an MCU master control chip, an ADC chip and an isolation chip, wherein a KL30 normal electric power supply is connected with the buck-boost chip, the 12V output of a VOUT pin of the buck-boost chip is connected with the buck chip and the high-side driving chip, the VOUT pin of the buck chip outputs 5V stably, the 5V output is connected with the D-type trigger and the isolation chip, the MCU master control chip is connected with the D-type trigger, a KL30 normal electric power supply is connected with the VINP and VINL pins of the buck-boost chip, PGND and GND are grounded, the VOUT pin outputs 12V stably, the 12V output of the buck-boost chip is connected with a VCC pin of the high-side driving chip, an INPUT pin of the high-side driving chip is connected with a Q pin of the D-type trigger, and a high-side driving MUETSENSe pin is connected with a PUA15 pin, the high-side driven OUTPUT is connected with one end of a relay coil, the other end of the relay coil is grounded, a 5V power supply of the isolation chip is connected with a VDD pin and a GND pin of an ADC chip, a SCLK pin is connected with a VOB pin of the isolation chip, a CS pin is connected with a VOC pin of the isolation chip, a DOUT/DRDY pin of the ADC chip is connected with a VID pin of the isolation chip, a DIN pin is connected with a VOA pin of the isolation chip, and SPI communication between the isolation chip and the ADC chip is formed.
2. The new energy automobile relay abnormity protection circuit is characterized in that when an output pin is at a high level, a relay is closed, when the output pin is at a low level, the relay is opened, a MultiSense pin of a high-side driving chip supports diagnosis of output voltage, whether 12V is output or not is judged, and an MCU acquires information through an ETPUA15 pin.
3. The relay abnormality protection circuit of the new energy automobile is characterized in that the 5V output of the buck chip is connected with VCC, PRE and CLR pins of the D-type flip-flop, GND of the D-type flip-flop is grounded, CLK pin of the D-type flip-flop is connected with EMIOS30 pin of the MCU, and D pin of the D-type flip-flop is connected with EMIOS31 pin of the MCU main control chip.
4. The new energy automobile relay abnormity protection circuit is characterized in that the isolation chip is an ADUM5401W chip, the 5V output of the buck chip is connected with a VDD1 pin of the ADUM5401W chip, the GND1 pin is grounded, the VIA pin is connected with a PCSB2 pin of the MCU main control chip, the VIB pin is connected with a PCSB4 pin of the MCU main control chip, the VIC pin is connected with a PCSB1 pin of the MCU main control chip, the VOD pin is connected with a PCSB pin of the MCU main control chip to form isolation SPI communication between the isolation chip and the MCU main control chip, and the VSEL and VISO output an isolated 5V power supply in parallel.
5. The new energy automobile relay abnormity protection circuit is characterized in that the MCU main control chip controls CLK and D pins of a D-type flip-flop, and the CLK is set to be kept at a high level when the MCU main control chip works normally through software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110707416.7A CN113161999B (en) | 2021-06-25 | 2021-06-25 | New energy automobile relay abnormity protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110707416.7A CN113161999B (en) | 2021-06-25 | 2021-06-25 | New energy automobile relay abnormity protection circuit |
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| CN113161999A CN113161999A (en) | 2021-07-23 |
| CN113161999B true CN113161999B (en) | 2021-10-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7742317B2 (en) * | 2007-12-19 | 2010-06-22 | Gm Global Technology Operations, Inc. | Precharging boost converters in DC to DC power converters |
| CN207603599U (en) * | 2017-12-15 | 2018-07-10 | 科博达技术股份有限公司 | Vehicle-mounted high side switches with defencive function |
| CN112398340B (en) * | 2020-10-27 | 2022-01-04 | 浙江大学 | Switching frequency switching and data modulation method and control system for peak current control mode |
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