CN111016664A - Relay control system and electric automobile's relay control system - Google Patents
Relay control system and electric automobile's relay control system Download PDFInfo
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- CN111016664A CN111016664A CN202010009408.0A CN202010009408A CN111016664A CN 111016664 A CN111016664 A CN 111016664A CN 202010009408 A CN202010009408 A CN 202010009408A CN 111016664 A CN111016664 A CN 111016664A
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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
- 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
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Abstract
The application provides a control system of relay and electric automobile's relay control system relates to circuit control technical field, can solve its technical problem that safe in utilization degree is lower under the more condition of high-voltage component. The control system of the relay includes: the analog-to-digital converter is used for acquiring the output voltage of the power supply equipment; the first switch circuit is respectively connected with the analog-to-digital converter and the power supply equipment and used for determining the abnormal condition of the output voltage according to the voltage difference between the local voltage of the power supply equipment and the output voltage; and the second switch circuit is respectively connected with the first switch circuit and the relay and is used for controlling the running state of the relay according to the abnormal condition.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a relay control system and a relay control system of an electric automobile.
Background
At present, electric automobiles are increasingly widely used. The main components of the electric automobile comprise a battery system, a motor system, an electric control system and the like, and all belong to high-voltage components.
In the electrical design process of the electric automobile, the relay is widely used. For an electric automobile, the design of a relay control circuit is important, and the design quality is high, so that the safety and the reliability of the whole automobile are directly influenced. However, the electric vehicle has many high-voltage components, and the circuit safety degree is low in the using process of the relay.
Disclosure of Invention
The invention aims to provide a relay control system and a relay control system of an electric automobile, which aim to solve the technical problem that the use safety degree is low under the condition that a large number of high-voltage components exist.
In a first aspect, an embodiment of the present invention provides a control system for a relay, including:
the analog-to-digital converter is used for acquiring the output voltage of the power supply equipment;
the first switch circuit is respectively connected with the analog-to-digital converter and the power supply equipment and used for determining the abnormal condition of the output voltage according to the voltage difference between the local voltage of the power supply equipment and the output voltage;
and the second switch circuit is respectively connected with the first switch circuit and the relay and is used for controlling the running state of the relay according to the abnormal condition.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the first switch circuit is controlled by a GPIO pin;
the first switch circuit is used for determining that the output voltage is abnormal when the voltage difference between the local voltage of the power supply equipment and the output voltage is larger than a preset threshold value, switching off the output of the power supply equipment, and reporting fault alarm information.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the first switch circuit is a PMOS high-side switch circuit or an intelligent MOS high-side switch circuit.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where if the first switch circuit is the intelligent MOS high-side switch circuit, the intelligent MOS high-side switch circuit is configured to detect a working current and a working voltage of the relay, so as to perform protection operation for an overvoltage, an undervoltage, or an overcurrent condition according to the working current and the working voltage.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the second switching circuit is any one of:
the intelligent MOS high-side switch circuit, the intelligent MOS low-side switch circuit and the PMOS high-side switch circuit.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where if the second switch circuit is the smart MOS low-side switch circuit, the smart MOS low-side switch circuit is configured to control a negative electrode of the relay, and the first switch circuit is configured to control a positive electrode of the relay.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where if the second switch circuit is the smart MOS high-side switch circuit, an operation mode of the smart MOS high-side switch circuit includes any one or more of the following:
normal mode, sleep mode, security failure mode.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where if the second switch circuit is the intelligent MOS high-side switch circuit, the intelligent MOS high-side switch circuit is further configured to perform a fault diagnosis operation; the fault diagnosis work comprises any one or more of the following:
the method aims at fault diagnosis work of overvoltage, undervoltage, overcurrent, overtemperature, load open circuit and load short circuit.
In a second aspect, an embodiment of the present invention further provides a relay control system for an electric vehicle, including: a control system of the power supply apparatus of the electric vehicle and the relay according to the first aspect;
the power supply equipment is respectively connected with the analog-to-digital converter and the first switch circuit in the control system of the relay.
In combination with the second aspect, the present invention provides a first possible implementation manner of the second aspect, wherein the power supply device is a lead-acid battery, and the lead-acid battery is used for supplying power to the high-voltage electric component of the electric vehicle.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the embodiment of the invention provides a relay control system and an electric automobile relay control system, which comprise: the high-voltage component comprises an analog-to-digital converter, a first switch circuit and a second switch circuit, wherein the analog-to-digital converter is used for collecting output voltage of power supply equipment, the first switch circuit is respectively connected with the analog-to-digital converter and the power supply equipment, the first switch circuit is used for determining abnormal conditions of the output voltage according to voltage difference between local voltage and the output voltage of the power supply equipment, the second switch circuit is respectively connected with the first switch circuit and a relay, the second switch circuit is used for controlling the running state of the relay according to the abnormal conditions, and a relay control redundant circuit is formed by series control of the two groups of switch circuits, namely the first switch circuit and the second switch circuit, so that the use safety of the high-voltage component is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram illustrating a control system of a relay according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a control system of a relay according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram illustrating a relay control system of an electric vehicle according to a second embodiment of the present invention;
fig. 4 shows another schematic structural diagram of a relay control system of an electric vehicle according to a second embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but rather covers any modification, replacement or improvement of elements, components or algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the description of the present application, the meaning of "at least one" means one or more than one unless otherwise stated. For example, at least one USB device refers to one USB device or more than one USB device.
Furthermore, the terms "comprising" and "having" and any variations thereof as referred to in the description of the invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
At present, the high-speed development of the automobile industry brings about a plurality of problems of energy crisis, environmental pollution and the like. The rapid development of new energy electric automobiles is an important way for realizing the transformation of traffic energy into sustainable development of the automobile industry. After various exploration periods, the mainstream technology of the new energy electric automobile is gradually clear, the power electrification of the automobile is realized, the new energy electric automobile is developed, and the consensus is achieved in various regions.
The most basic function of the current relay control circuit does not fully consider the safety of high-voltage components of the electric automobile. Furthermore, the relay control circuit fault diagnosis function is not provided. Moreover, the current relay control circuit is complex in design and high in cost.
Based on this, the relay control system and the relay control system of the electric automobile provided by the embodiment of the invention can solve the technical problem of low use safety degree under the condition that a large number of high-voltage components exist.
For the convenience of understanding the present embodiment, a detailed description will be given to a relay control system and a relay control system of an electric vehicle disclosed in the embodiments of the present invention.
The first embodiment is as follows:
as shown in fig. 1, a control system 1 of a relay according to an embodiment of the present invention includes:
the analog-to-digital converter 11 is used for acquiring the output voltage of the power supply equipment 12;
the first switch circuit 13 is respectively connected with the analog-to-digital converter and the power supply equipment and is used for determining the abnormal condition of the output voltage according to the voltage difference between the local voltage and the output voltage of the power supply equipment;
and the second switch circuit 14 is respectively connected with the first switch circuit and the relay 15 and is used for controlling the running state of the relay according to the abnormal condition.
Therefore, two groups of switch circuits are designed in the relay control circuit to be controlled in series, and a functional safety redundancy design circuit of the electric automobile is formed, so that the safety and the reliability of the electric automobile are ensured.
The redundant circuit is controlled through the relay, the fault diagnosis function is realized in consideration of the safety of the functions of the high-voltage components of the electric automobile, the design is simple, and the cost is low.
In some embodiments, the first switching circuit is controlled by a GPIO pin; the first switch circuit is used for determining that the output voltage is abnormal when the voltage difference between the local voltage and the output voltage of the power supply equipment is larger than a preset threshold value, turning off the output of the power supply equipment and reporting fault alarm information.
For example, as shown in fig. 2, the first switch circuit is controlled by a GPIO pin of the MCU, has an active high level, has output diagnosis, acquires an output voltage through the ADC, compares the output voltage with a voltage of the power supply device, and can determine that the output voltage is abnormal when a voltage difference is greater than 1V, report a fault alarm message, turn off the output, and improve the safety level.
In some embodiments, the first switch circuit is a PMOS high-side switch circuit or a smart MOS high-side switch circuit.
In the application of an electric automobile, short circuit to the ground is the most common failure phenomenon, and in a high-voltage component system, if fault report or failure occurs, a relay must be ensured to be in an off state, especially, the relay at an important position, such as the positive end and the negative end of a battery system, requires a complex chip protection control strategy and high reliability, so that a relay control circuit can select a high-side switch for output.
In some embodiments, if the first switch circuit is an intelligent MOS high-side switch circuit, the intelligent MOS high-side switch circuit is configured to detect a working current and a working voltage of the relay, so as to perform protection operation for overvoltage, undervoltage, or overcurrent conditions according to the working current and the working voltage.
The first switch circuit can be an intelligent MOS high-side switch circuit, two groups of intelligent MOS high-side switches are formed to be connected in series for output, the working current and the working voltage of a rear-stage load (relay) can be indirectly detected, and overvoltage, undervoltage and overcurrent protection can be directly judged.
In some embodiments, the second switching circuit is any one of:
the intelligent MOS high-side switch circuit, the intelligent MOS low-side switch circuit and the PMOS high-side switch circuit.
If the second switch circuit is the output of the common PMOS high-side switch, the second switch circuit is connected with the output of the first-stage common PMOS high-side switch in series to form electric quantity output by two groups of common PMOS high-side switches in series.
As shown in fig. 2, the High-side output of the smart MOS is controlled by an application-specific integrated chip, such as a High-side Driver (HSD). The chip power supply input is from the output of the upper-level PMOS high-side switch, but is not directly connected with the lead-acid battery of the whole automobile, and the output end directly controls the relay of the high-voltage component in the electric automobile. Therefore, two groups of high-side switches are designed in the relay control circuit for series control, the functional safety redundancy design of the electric automobile is formed, and the safety and the reliability of the electric automobile can be further ensured.
In some embodiments, if the second switch circuit is a smart MOS low side switch circuit, the smart MOS low side switch circuit is used to control the cathode of the relay, and the first switch circuit is used to control the anode of the relay.
If the second switch circuit is an intelligent MOS low-side switch circuit, the negative pole of the relay control output is grounded, and the positive pole output is output by a common PMOS high-side switch. Namely, a group of common PMOS high-side switches output control anodes, and a group of intelligent MOS low-side switches output control cathodes, thereby ensuring the safety of the circuit.
In some embodiments, if the second switching circuit is a smart MOS high-side switching circuit, the operating mode of the smart MOS high-side switching circuit includes any one or more of:
normal mode, sleep mode, security failure mode.
In practical application, the intelligent MOS high-side switch may have 3 operating modes, which are a normal mode, a sleep mode, and a security failure mode. The safety of the relay circuit can be improved through a plurality of working modes.
In some embodiments, if the second switching circuit is an intelligent MOS high-side switching circuit, the intelligent MOS high-side switching circuit is further configured to perform a fault diagnosis operation; the fault diagnosis work may include any one or more of:
the method aims at fault diagnosis work of overvoltage, undervoltage, overcurrent, overtemperature, load open circuit and load short circuit.
In practical application, the intelligent MOS high-side switch circuit may further have a plurality of fault diagnosis functions, such as overvoltage, undervoltage, overcurrent, overtemperature, load open circuit, load short circuit, etc., so as to improve the safety of the relay circuit.
Example two:
as shown in fig. 3, the relay control system 3 of the electric vehicle according to the embodiment of the present invention includes: a power supply device 31 of an electric vehicle and a control system of a relay provided in the first embodiment;
the power supply device 31 of the electric vehicle is connected to the analog-to-digital converter and the first switch circuit in the relay control system 1, respectively.
The relay control system of the electric automobile provided by the embodiment of the application can be applied to relay control redundant circuits of pure electric vehicles (BEV), plug-in hybrid electric vehicles (PHEV), Fuel Cell Vehicles (FCV) and 48V miniature hybrid electric vehicles.
The working principle of the relay control circuit of the electric automobile is as follows: when the whole vehicle is normally powered on, the system components start to carry out initialization self-checking, after no fault exists, the whole vehicle enters a power-on and power-off process, at the moment, the relay control circuit works, the relay is closed, and discharging is prepared.
In some embodiments, as shown in fig. 4, the power supply device of the electric vehicle is a lead-acid battery 32 for providing power to the high-voltage electrical components of the electric vehicle. The power input is provided for the lead-acid battery of the whole vehicle, so that the reverse connection protection function can be provided, and the circuit safety is improved.
The relay control system of the electric vehicle provided by the embodiment of the invention has the same technical characteristics as the relay control system provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
Unless specifically stated otherwise, the relative numerical expressions and values of the components set forth in these embodiments do not limit the scope of the present invention.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and computer program products according to various embodiments of the present invention. In this regard, each block in the block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams, and combinations of blocks in the block diagrams, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.
Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the functions provided by the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A control system for a relay, comprising:
the analog-to-digital converter is used for acquiring the output voltage of the power supply equipment;
the first switch circuit is respectively connected with the analog-to-digital converter and the power supply equipment and used for determining the abnormal condition of the output voltage according to the voltage difference between the local voltage of the power supply equipment and the output voltage;
and the second switch circuit is respectively connected with the first switch circuit and the relay and is used for controlling the running state of the relay according to the abnormal condition.
2. The system of claim 1, wherein the first switching circuit is controlled by a GPIO pin;
the first switch circuit is used for determining that the output voltage is abnormal when the voltage difference between the local voltage of the power supply equipment and the output voltage is larger than a preset threshold value, switching off the output of the power supply equipment, and reporting fault alarm information.
3. The system of claim 1, wherein the first switch circuit is a PMOS high-side switch circuit or a smart MOS high-side switch circuit.
4. The system of claim 3, wherein if the first switch circuit is the smart MOS high-side switch circuit, the smart MOS high-side switch circuit is configured to detect an operating current and an operating voltage of the relay, so as to perform protection operation for over-voltage, under-voltage or over-current conditions according to the operating current and the operating voltage.
5. The system of claim 1, wherein the second switching circuit is any one of:
the intelligent MOS high-side switch circuit, the intelligent MOS low-side switch circuit and the PMOS high-side switch circuit.
6. The system of claim 5, wherein if the second switch circuit is the smart MOS low side switch circuit, the smart MOS low side switch circuit is used to control the negative pole of the relay, and the first switch circuit is used to control the positive pole of the relay.
7. The system of claim 5, wherein if the second switching circuit is the smart MOS high-side switching circuit, the operating mode of the smart MOS high-side switching circuit comprises any one or more of:
normal mode, sleep mode, security failure mode.
8. The system of claim 5, wherein if the second switching circuit is the smart MOS high-side switching circuit, the smart MOS high-side switching circuit is further configured to perform fault diagnosis operations; the fault diagnosis work comprises any one or more of the following:
the method aims at fault diagnosis work of overvoltage, undervoltage, overcurrent, overtemperature, load open circuit and load short circuit.
9. A relay control system of an electric vehicle, characterized by comprising: a control system of the power supply apparatus of the electric vehicle and the relay according to any one of claims 1 to 8;
the power supply equipment is respectively connected with the analog-to-digital converter and the first switch circuit in the control system of the relay.
10. The system of claim 9, wherein the power device is a lead-acid battery configured to provide power to high-voltage electrical components of the electric vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010009408.0A CN111016664A (en) | 2020-01-03 | 2020-01-03 | Relay control system and electric automobile's relay control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010009408.0A CN111016664A (en) | 2020-01-03 | 2020-01-03 | Relay control system and electric automobile's relay control system |
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| CN111016664A true CN111016664A (en) | 2020-04-17 |
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| CN202010009408.0A Pending CN111016664A (en) | 2020-01-03 | 2020-01-03 | Relay control system and electric automobile's relay control system |
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| US6501196B1 (en) * | 2000-09-12 | 2002-12-31 | Storage Technology Corporation | Fault tolerant AC transfer switch |
| JP2010108129A (en) * | 2008-10-29 | 2010-05-13 | Yokogawa Electric Corp | Switching device |
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Application publication date: 20200417 |