CN116093879A - Overcurrent protection circuit and permanent magnet synchronous motor of electric automobile - Google Patents
Overcurrent protection circuit and permanent magnet synchronous motor of electric automobile Download PDFInfo
- Publication number
- CN116093879A CN116093879A CN202211688845.5A CN202211688845A CN116093879A CN 116093879 A CN116093879 A CN 116093879A CN 202211688845 A CN202211688845 A CN 202211688845A CN 116093879 A CN116093879 A CN 116093879A
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- comparator
- diode
- rectifier bridge
- overcurrent protection
- protection circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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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
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses an overcurrent protection circuit and an electric automobile permanent magnet synchronous motor, wherein the overcurrent protection circuit comprises a three-phase rectifier bridge, a first comparator, a second comparator and a third comparator, the three-phase rectifier bridge is respectively connected with the output end of a Hall current sampling signal three-phase alternating current, the non-inverting input ends of the first comparator, the second comparator and the third comparator are connected in series and then connected with a threshold voltage, the inverting input ends of the first comparator, the second comparator and the third comparator are connected with the output end of the three-phase rectifier bridge, and the output ends formed by connecting the output ends of the first comparator, the second comparator and the third comparator in series are singlechip ports. The overcurrent protection circuit provided by the application can output a low level to be judged as overcurrent as long as any phase of overcurrent, so that overcurrent protection is realized, the circuit design is simple and effective, and the realization cost is low.
Description
Technical Field
The invention relates to the technical field of circuit overcurrent protection, in particular to an overcurrent protection circuit and an electric automobile permanent magnet synchronous motor.
Background
With the continuous development of electric vehicles, people have higher requirements on the reliability of the electric vehicles. The motor controller of the electric automobile is used as a core safety component of the electric automobile, the overcurrent protection circuit of the existing permanent magnet synchronous motor has poor logic readability, and more circuit use elements. The input current signal is sine wave, the logic problem of signal positive and negative needs to be processed separately, and the circuit is complex.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides an overcurrent protection circuit and an electric automobile permanent magnet synchronous motor.
In a first aspect, the present application provides an overcurrent protection circuit, including three-phase rectifier bridge, first comparator, second comparator and third comparator, the three-phase rectifier bridge is connected with hall current sampling signal three-phase alternating current's output respectively, first comparator, second comparator with access threshold voltage after the homophase input of third comparator establishes ties, first comparator, second comparator with the inverting input of third comparator with the output of three-phase rectifier bridge is connected, first comparator, second comparator with the output that the output series formation of third comparator is the singlechip port.
In some embodiments, the three-phase rectifier bridge includes a first rectifier bridge, a second rectifier bridge, and a third rectifier bridge, where the first rectifier bridge is composed of a diode D1, a diode D2, a diode D3, and a diode D4 that are sequentially connected, the second rectifier bridge is composed of a diode D5, a diode D6, a diode D7, and a diode D8 that are sequentially connected, and the third rectifier bridge is composed of a diode D9, a diode D10, a diode D11, and a diode D12 that are sequentially connected.
In some embodiments, the diode D1 and the diode D2 of the first rectifier bridge are grounded, the diode D3 and the diode D4 are connected to the inverting input terminal of the first comparator, the diode D5 and the diode D6 of the second rectifier bridge are grounded, the diode D7 and the diode D8 are connected to the inverting input terminal of the second comparator, the diode D9 and the diode D10 of the third rectifier bridge are grounded, and the diode D11 and the diode D12 are connected to the inverting input terminal of the third comparator.
In some embodiments, when the voltage accessed by the negative phase input end of the first comparator, the second comparator or the third comparator exceeds a voltage threshold, the singlechip port outputs a low level.
In a second aspect, the application provides a permanent magnet synchronous motor of an electric automobile, which comprises a hall current sensor, an overcurrent protection circuit and a singlechip, wherein the three-phase current output end of the hall current sensor is respectively connected with the input end of a three-phase rectifier bridge, the output ends of a first comparator, a second comparator and a third comparator are connected in series and are used for being connected with a singlechip port, and the singlechip is used for judging whether the hall current sensor has an overcurrent working condition according to a received level signal.
Compared with the prior art, the invention has the following advantages:
according to the overcurrent protection circuit, the three-phase rectifier bridge and the three comparators are arranged, the output end of the acquired current sampling signal is connected into the corresponding rectifier bridge, the absolute value of the sinusoidal signal is directly acquired, the output ends of the three comparators are connected in series to share one port, and the output signal can output a low level and is judged to be overcurrent as long as any phase of overcurrent, so that overcurrent protection on the output signal is realized, the circuit design is simple and effective, and the realization cost is low.
Drawings
Fig. 1 is a circuit diagram of an overcurrent protection circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the described embodiments. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or arrangement of functions, and any functional block or arrangement of functions may be implemented as a physical entity or a logical entity, or a combination of both.
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to understand the invention better.
Note that: the examples to be described below are only one specific example, and not as limiting the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can, upon reading the present specification, make and use the concepts of the invention to construct further embodiments not mentioned in the specification.
The output current of the Hall current sampling signal output end is sine wave, the logic problem of signal positive and negative needs to be processed separately, and the circuit design is complex.
In view of this, the present application provides an overcurrent protection circuit, which effectively solves the technical problem that the sine wave current signal needs to separately process the logic problem of the positive and negative signals.
Referring to fig. 1, the overcurrent protection circuit provided by the application includes a three-phase rectifier bridge, a first comparator U1, a second comparator U2 and a third comparator U3, wherein the three-phase rectifier bridge is respectively connected with an output end of a three-phase alternating current of a current sampling signal, in-phase input ends of the first comparator U1, the second comparator U2 and the third comparator U3 are connected in series and then connected with a threshold voltage, inverting input ends of the first comparator U1, the second comparator U2 and the third comparator U3 are respectively connected with an output end of the three-phase rectifier bridge, and an output end formed by connecting the output ends of the first comparator U1, the second comparator U2 and the third comparator U3 in series is a singlechip port.
The overcurrent protection circuit provided by the application does not need to separate the current signals of sine waves to process the positive logic problem and the negative logic problem of the signals, the three-phase rectifier bridge is designed, the accessed sine wave signals are directly taken as absolute values, whether positive current or negative current is adopted, if the absolute values exceed a set voltage threshold value, the comparator outputs low level, the output end of the comparator of the three-phase current shares one port to a singlechip port, the output signals are pulled down as long as one phase of overcurrent occurs, the overcurrent is judged, the circuit design logic relationship is simple, the circuit cost is lower, and the singlechip port is intensive.
In an embodiment, the three-phase rectifier bridge includes a first rectifier bridge, a second rectifier bridge and a third rectifier bridge, the first rectifier bridge is composed of a diode D1, a diode D2, a diode D3 and a diode D4 which are sequentially connected, the second rectifier bridge is composed of a diode D5, a diode D6, a diode D7 and a diode D8 which are sequentially connected, and the third rectifier bridge is composed of a diode D9, a diode D10, a diode D11 and a diode D12 which are sequentially connected. The diode D1 and the diode D2 of the first rectifier bridge are grounded, a U-shaped cross current is connected between the diode D1 and the diode D2, an inverting input end of the first comparator U1 is connected between the diode D3 and the diode D4, a V-shaped cross current is connected between the diode D5 and the diode D6 of the second rectifier bridge, a inverting input end of the second comparator U2 is connected between the diode D5 and the diode D7, a grounding is connected between the diode D7 and the diode D8, a W-shaped cross current is connected between the diode D9 and the diode D10 of the third rectifier bridge, and an inverting input end of the third comparator U3 is connected between the diode D11 and the diode D12. The three-phase current is rectified by the corresponding rectifier bridge and then becomes steamed bread wave, the absolute value of a sine signal is obtained, the sine signal is completely converted into a signal which is more than or equal to 0, and when the signal of the inverting input end of the corresponding comparator is compared with the threshold voltage of the non-inverting input end, the output is pulled down no matter the signal is in forward overcurrent or in inverting overcurrent, so that the output overcurrent information of the Hall current sensor is obtained.
In an embodiment, the non-inverting input ends of the first comparator U1, the second comparator U2 and the third comparator U3 are connected with an upper limit voltage dividing circuit, the upper limit voltage dividing circuit comprises R1 and R2 which are serially arranged between a 5V power supply and ground, and a threshold voltage is connected between R1 and R2.
In a second aspect, the application further provides an electric automobile permanent magnet synchronous motor, which comprises a hall current sensor, the overcurrent protection circuit and the singlechip, wherein three-phase current output ends of the hall current sensor are respectively connected with input ends of a first rectifier bridge, a second rectifier bridge and a third rectifier bridge, output ends of a first comparator U1, a second comparator U2 and a third comparator U3 are connected in series and are connected with a singlechip port, and the singlechip is used for judging whether the hall current sensor has an overcurrent working condition or not according to received level signals and controlling to start the overcurrent protection function. Therefore, the permanent magnet synchronous motor of the electric automobile has the advantages of overcurrent protection, simple circuit logic design and low realization cost.
Based on the same inventive concept, the embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements all or part of the method steps of the above method.
The present invention may be implemented by implementing all or part of the above-described method flow, or by instructing the relevant hardware by a computer program, which may be stored in a computer readable storage medium, and which when executed by a processor, may implement the steps of the above-described method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, ra ndom Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
Based on the same inventive concept, the embodiments of the present application further provide an electronic device, including a memory and a processor, where the memory stores a computer program running on the processor, and when the processor executes the computer program, the processor implements all or part of the method steps in the above method.
The processor may be a central processing unit (Central Processing Unit, CP U), but may also be other general purpose processors, digital signal processors (Digital Signal Pr ocessor, DSP), application specific integrated circuits (Application Specific Integrated Circ uit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being a control center of the computer device, and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor implements various functions of the computer device by running or executing the computer programs and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the handset. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (flash Card), at least one disk storage device, flash memory device, or other volatile solid state storage device.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. An overcurrent protection circuit, comprising:
the three-phase rectifier bridge is respectively connected with the output end of the Hall current sampling signal three-phase alternating current, the non-inverting input ends of the first comparator, the second comparator and the third comparator are connected in series and then connected with the threshold voltage, the inverting input ends of the first comparator, the second comparator and the third comparator are connected with the output end of the three-phase rectifier bridge, and the output end formed by connecting the output ends of the first comparator, the second comparator and the third comparator in series is a singlechip port.
2. The overcurrent protection circuit according to claim 1, wherein the three-phase rectifier bridge includes a first rectifier bridge composed of a diode (D1), a diode (D2), a diode (D3), and a diode (D4) connected in sequence, a second rectifier bridge composed of a diode (D5), a diode (D6), a diode (D7), and a diode (D8) connected in sequence, and a third rectifier bridge composed of a diode (D9), a diode (D10), a diode (D11), and a diode (D12) connected in sequence.
3. The overcurrent protection circuit according to claim 2, wherein an inverting input terminal of the first comparator is connected between a diode (D1) and a diode (D2) of the first rectifier bridge, an inverting input terminal of the second comparator is connected between a diode (D5) and a diode (D6) of the second rectifier bridge, an inverting input terminal of the second comparator is connected between a diode (D7) and a diode (D8), an inverting input terminal of the third comparator is connected between a diode (D9) and a diode (D10) of the third rectifier bridge, and an inverting input terminal of the third comparator is connected between a diode (D11) and a diode (D12).
4. The overcurrent protection circuit of claim 1, wherein the single-chip port outputs a low level when the signal voltage accessed at the negative input of the first comparator, the second comparator, or the third comparator exceeds a voltage threshold.
5. The permanent magnet synchronous motor of the electric automobile is characterized by comprising a Hall current sensor, the overcurrent protection circuit and a singlechip, wherein the overcurrent protection circuit is any one of claims 1-4, the three-phase current output end of the Hall current sensor is respectively connected with the input end of a three-phase rectifier bridge, the output ends of a first comparator, a second comparator and a third comparator are connected in series and are used for being connected with a singlechip port, and the singlechip is used for judging whether the Hall current sensor has an overcurrent working condition according to a received level signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211688845.5A CN116093879A (en) | 2022-12-27 | 2022-12-27 | Overcurrent protection circuit and permanent magnet synchronous motor of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211688845.5A CN116093879A (en) | 2022-12-27 | 2022-12-27 | Overcurrent protection circuit and permanent magnet synchronous motor of electric automobile |
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| Publication Number | Publication Date |
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| CN116093879A true CN116093879A (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211688845.5A Pending CN116093879A (en) | 2022-12-27 | 2022-12-27 | Overcurrent protection circuit and permanent magnet synchronous motor of electric automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116706842A (en) * | 2023-06-06 | 2023-09-05 | 北京中科昊芯科技有限公司 | Motor overcurrent protection method and device |
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2022
- 2022-12-27 CN CN202211688845.5A patent/CN116093879A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116706842A (en) * | 2023-06-06 | 2023-09-05 | 北京中科昊芯科技有限公司 | Motor overcurrent protection method and device |
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