CN116184066A - Detection device of direct current output loop of charging pile and charging pile - Google Patents
Detection device of direct current output loop of charging pile and charging pile Download PDFInfo
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- CN116184066A CN116184066A CN202211686193.1A CN202211686193A CN116184066A CN 116184066 A CN116184066 A CN 116184066A CN 202211686193 A CN202211686193 A CN 202211686193A CN 116184066 A CN116184066 A CN 116184066A
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for electric vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Secondary Cells (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a detection device of a direct current output loop of a charging pile and the charging pile. Wherein, this detection device includes: the differential pressure detection module is in communication connection with the charging control module; the differential pressure detection module is used for connecting with a circuit to be detected in a direct current output loop of the charging pile and collecting a sampling voltage value of the circuit to be detected; the charging control module is used for determining an equivalent internal resistance value of the loop to be detected according to the sampling voltage value acquired by the differential pressure detection module and the sampling current value of the direct current output loop of the charging pile; and the charging control module is also used for judging whether the loop to be detected fails according to the equivalent internal resistance value and interrupting the charging process of the charging pile under the condition that the loop to be detected is judged to have the failure. The invention solves the technical problem of lack of rapid detection of the fault state of the circuit to be detected in the direct current output circuit.
Description
Technical Field
The invention relates to the field of electric vehicle charging, in particular to a detection device of a direct current output loop of a charging pile and the charging pile.
Background
In recent years, charging facilities are explosively increased, and as the use frequency of the charging facilities is increased, the safety problem of the charging pile is gradually exposed, and the overheating ablation of the direct current output device of the charging pile is one of the problems. The reasons for the problem are numerous, including heating caused by loosening of a fixing bolt of a direct current output connecting element, heating caused by change of the property of a device, and the like, and the current direct current charging pile cannot judge overheat ablation risks due to lack of a state monitoring means of a direct current output assembly, so that equipment safety and potential safety hazards of electric automobiles and personnel are caused.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a detection device of a direct current output loop of a charging pile and the charging pile, which at least solve the technical problem of lack of rapid detection of a fault state of a circuit to be detected in the direct current output circuit.
According to an aspect of the embodiment of the present invention, there is provided a detection apparatus for a dc output loop of a charging pile, including: the device comprises a differential pressure detection module and a charging control module, wherein the differential pressure detection module is in communication connection with the charging control module; the differential pressure detection module is used for connecting with a circuit to be detected in a direct current output loop of the charging pile and collecting a sampling voltage value of the circuit to be detected; the charging control module is used for determining an equivalent internal resistance value of the loop to be detected according to the sampling voltage value acquired by the differential pressure detection module and the sampling current value of the direct current output loop of the charging pile; and the charging control module is also used for judging whether the loop to be detected fails according to the equivalent internal resistance value and interrupting the charging process of the charging pile under the condition that the loop to be detected is judged to have the failure.
Optionally, the differential pressure detection module includes: the module chip is used for controlling the operation of the differential pressure detection circuits.
Optionally, the differential pressure detection circuit includes: the circuit comprises a relay driving circuit, a primary amplifying circuit and a secondary amplifying circuit, wherein the relay driving circuit is used for controlling whether a circuit to be detected is connected with the primary amplifying circuit or not according to a control command signal sent by a module chip; the primary amplifying circuit is used for isolating and amplifying the voltage signal input by the circuit to be detected; and the secondary amplifying circuit is used for carrying out secondary amplification on the voltage signal obtained after the primary amplifying circuit is isolated and amplified, so as to obtain the sampling voltage value of the circuit to be detected.
Optionally, the primary amplifying circuit is used for amplifying the voltage signal of the circuit to be detected by a first multiple; the secondary amplifying circuit is used for amplifying the voltage signal after the first multiple by a second multiple and raising the value of the voltage signal after the second multiple by beta again.
Optionally, the relay driving circuit includes: a control signal circuit and a reed relay; the control signal circuit comprises a triode, and the triode controls the reed relay to be electrified when a control instruction signal sent by the module chip is at a high level; the reed relay is powered on and is always closed by the open contact, and a circuit to be detected is connected into the primary amplifying circuit through the relay driving circuit under the condition that the normally open contact is closed.
Optionally, the primary amplifying circuit includes: the differential capacitor is connected with the anti-reverse diode in parallel.
Optionally, the secondary amplifying circuit includes: the operational amplifier circuit, the clamping diode and the filter capacitor; the operational amplifier circuit comprises an operational resistor and an operational amplifier, wherein a clamping diode and a filter capacitor are respectively connected with an output port of the operational amplifier circuit in parallel, and the output port of the operational amplifier circuit is used for outputting a sampling voltage value.
Optionally, the charging control module includes: and the RS485 communication interface is used for being connected with the electric energy meter of the charging pile and obtaining the sampling current value of the direct current output loop of the charging pile from the electric energy meter.
Optionally, the charging control module determines whether the loop to be detected is faulty by: acquiring a first resistance threshold and a second resistance threshold corresponding to a circuit to be detected, wherein the first resistance threshold is smaller than the second resistance threshold; judging that the loop to be detected has no fault under the condition that the equivalent internal resistance is smaller than a first resistance threshold value; judging that an alarm condition exists in the loop to be detected under the condition that the equivalent internal resistance is larger than or equal to the first resistance threshold and smaller than the second resistance threshold; and under the condition that the equivalent internal resistance is larger than the second resistance threshold value, judging that the loop to be detected fails.
According to another aspect of the embodiment of the present invention, there is also provided a charging pile including: a direct current output loop, an electric energy meter and a detection device of any one of the above; the differential pressure detection module of the detection device is in communication connection with a circuit to be detected in the direct current output loop and is used for acquiring the sampling voltage of the circuit to be detected; and the charging control module of the detection device is in communication connection with the electric energy meter and is used for acquiring the sampling current of the direct current output loop from the electric energy meter.
In the embodiment of the invention, the detection device capable of directly detecting whether various components in the direct current output loop of the charging pile have faults under the condition that the charging pile is not modified is provided, the differential pressure detection module of the detection device is adopted to measure the differential pressure at two ends of the components in the direct current output loop, and the charging control module is used for estimating the equivalent internal resistance value of the components based on the differential pressure at the two ends of the components, so that whether the loop to be detected has faults is judged under the condition that the circuit structure in the charging pile is not changed, the charging process of the charging pile can be interrupted under the condition that the loop to be detected has faults is judged, and the purpose that whether each circuit to be detected in the direct current output loop of the charging pile has faults can be detected without disassembling parts in the direct current output loop or changing the circuit structure in the direct current output loop is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a block diagram of a detection device of a direct current output loop of a charging pile according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative DC output circuit equivalent internal resistance detection according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative differential pressure detection module differential pressure detection circuit according to an embodiment of the invention;
fig. 4 is a block diagram of a charging pile according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
According to an embodiment of the present invention, there is provided a detection apparatus for a dc output circuit of a charging pile, and fig. 1 is a block diagram of a detection apparatus for a dc output circuit of a charging pile according to an embodiment of the present invention, as shown in fig. 1, the detection apparatus 10 includes: the differential pressure detection module 12 and the charge control module 14 will be described below as a detection device for the dc output circuit of the charging pile.
The detection device of the direct current output loop of the charging pile comprises a differential pressure detection module and a charging control module, wherein the differential pressure detection module is in communication connection with the charging control module.
Optionally, the voltage difference detection module in the detection device of the direct current output loop of the charging pile can be used for detecting a circuit parameter value of the direct current output loop of the charging pile, the other charging control module is in communication connection with the voltage difference detection module, the circuit parameter of the direct current output loop of the charging pile can be obtained from the voltage difference detection module, whether the direct current output loop of the charging pile fails or not can be judged, and the charging pile can be controlled to stop charging when the direct current output loop of the charging pile fails, so that serious consequences of the charging pile due to the failure of the direct current output loop of the charging pile can be prevented.
The differential pressure detection module can be used for being connected with a circuit to be detected in a direct current output loop of the charging pile and collecting a sampling voltage value of the circuit to be detected.
Specifically, a plurality of devices are arranged in a direct current output loop of the charging pile, tiny voltage drops are generated when direct current passes through the devices, when the devices are abnormal or the connection between the devices and the loop is abnormal, such as loosening of bolts, the differential pressure flowing through the loop is abnormal, two ends of each device in the direct current output loop can be connected with a differential pressure detection module, and the differential pressure detection module can detect the differential pressure at two ends of the connected devices to judge whether the connected circuit to be detected is abnormal. That is to say, the dc output circuit may include a plurality of circuits to be detected, the differential pressure detection module may be connected to the circuits to be detected, and detect a sampling voltage value of the circuits to be detected, where the sampling voltage value may be a differential pressure across a certain device in the dc output circuit connected to the differential pressure detection module.
The charging control module can be used for determining an equivalent internal resistance value of the loop to be detected according to the sampling voltage value acquired by the differential pressure detection module and the sampling current value of the direct current output loop of the charging pile; the charging control module can also be used for judging whether the loop to be detected fails according to the equivalent internal resistance value, and interrupting the charging process of the charging pile under the condition that the loop to be detected is judged to have the failure.
Specifically, the charging control module may obtain a sampling voltage value of a circuit to be detected in a dc output circuit of the charging pile, determine an equivalent internal resistance value of the circuit to be detected according to the sampling voltage, and determine whether the dc output circuit of the charging pile fails according to the equivalent internal resistance value of the circuit to be detected; and under the condition that the direct current output loop of the charging pile fails, the charging process of the charging pile can be stopped, so that the equipment safety and potential safety hazards of electric vehicles and personnel caused by the failure of the direct current output loop are avoided.
In the embodiment of the invention, the detection device capable of directly detecting whether various components in the direct current output loop of the charging pile have faults under the condition that the charging pile is not modified is provided, the differential pressure detection module of the detection device is adopted to measure the differential pressure at two ends of the components in the direct current output loop, and the charging control module is used for estimating the equivalent internal resistance value of the components based on the differential pressure at the two ends of the components, so that whether the loop to be detected has faults is judged under the condition that the circuit structure in the charging pile is not changed, the charging process of the charging pile can be interrupted under the condition that the loop to be detected has faults is judged, and the purpose that whether each circuit to be detected in the direct current output loop of the charging pile has faults can be detected without disassembling parts in the direct current output loop or changing the circuit structure in the direct current output loop is achieved.
As an alternative embodiment, the differential pressure detection module includes: the module chip is used for controlling the operation of the differential pressure detection circuits.
Optionally, the differential pressure detection module may include one or more differential pressure detection interfaces and a differential pressure detection circuit, where the differential pressure detection interfaces and the differential pressure detection circuit are in one-to-one correspondence, and the circuit to be detected in the charging pile direct current output loop may be connected with the differential pressure detection circuit through the differential pressure detection interfaces. The module chip is a chip for controlling the differential pressure detection module to detect the differential pressure, and parameters in the module chip can be set to periodically control the differential pressure detection module to detect the differential pressure of a circuit to be detected in the direct current output loop of the charging pile.
FIG. 2 is an alternative schematic diagram of detecting equivalent internal resistance of a DC output circuit according to an embodiment of the present invention, as shown in FIG. 2, a differential pressure detection module and a charging control module are in communication with each other through CAN, and the charging control module and an electric energy meter are in communication with each other through RS 485; the direct current output loop component of the charging pile comprises a fuse FU, direct current contactors K1 and K2, a shunt RS and the like, tiny voltage drops are generated when direct current passes through the devices, and when the devices are abnormal or the connection between the devices and the loop is abnormal, such as loosening of bolts and the like, the pressure difference flowing through the loop of the section is abnormal; the differential pressure detection module is provided with one or more differential pressure detection interfaces, each differential pressure detection interface is connected with a differential pressure detection circuit, such as the equivalent internal resistance of the S1+ and S1-detection fuse FU, the equivalent internal resistance of the S2+ and S2-detection direct current contactor K1, the equivalent internal resistance of the S3+ and S3-detection shunt RS, the equivalent internal resistance of the S4+ and S4-detection direct current contactor K2 and the like in the figure 1, and can detect a tiny voltage drop value between any two interfaces in the direct current output loop.
The reserved terminal can be detected in the dc output circuit of the charging pile and is used for connecting with the differential pressure detection interface of the detection device 10. In the fault detection process, the differential pressure detection interface of the detection device 10 can be connected with the detection reserved terminals on two sides of any circuit to be detected in the direct current output loop through a circuit, so that the differential pressure detection module can detect the differential pressure rise and fall change of any circuit to be detected under the condition of not changing the self structure of the charging pile, and an effective means is provided for conveniently detecting faults in the direct current output loop of the charging pile. Wherein, S1+, S1-, S2+, S2-, S3+, S3-and S4+ and S4-in FIG. 2 are all the above detection reserved terminals.
It should be noted that, in fig. 2, only some key devices are listed, and other devices are included in the dc output circuit of the charging pile, so that other devices may be abnormal when the dc charging pile works.
As an alternative embodiment, the differential pressure detection circuit includes: the circuit comprises a relay driving circuit, a primary amplifying circuit and a secondary amplifying circuit, wherein the relay driving circuit is used for controlling whether a circuit to be detected is connected with the primary amplifying circuit or not according to a control command signal sent by a module chip; the primary amplifying circuit is used for isolating and amplifying the voltage signal input by the circuit to be detected; and the secondary amplifying circuit is used for carrying out secondary amplification on the voltage signal obtained after the primary amplifying circuit is isolated and amplified, so as to obtain the sampling voltage value of the circuit to be detected.
As an alternative embodiment, the primary amplifying circuit is configured to amplify the voltage signal of the circuit to be detected by a first multiple; the secondary amplifying circuit is used for amplifying the voltage signal after the first multiple by a second multiple and raising the value of the voltage signal after the second multiple by beta again.
Alternatively, a differential pressure detection circuit may be used to detect a sampling voltage value of a circuit to be detected, each differential pressure detection circuit including a relay driving circuit, a primary amplifying circuit, and a secondary amplifying circuit. The relay driving circuit can control the circuit to be detected to be connected with the primary amplifying circuit according to the detection instruction sent by the module chip, after the primary amplifying circuit is connected with the circuit to be detected, the primary amplifying circuit can conduct isolation amplification on a voltage signal input by the circuit to be detected, and the electric signal subjected to primary amplification is input into the secondary amplifying circuit, and secondary amplification is conducted on the voltage signal input by the circuit to be detected. In the scheme, the voltage input by the circuit to be detected can be the pressure difference at two ends of a certain component in the direct current output loop of the charging pile, the pressure difference can be very small, the voltage difference can be detected after passing through the primary amplifying circuit and the secondary amplifying circuit, and errors can be effectively avoided. The specific connection mode of the circuit can be designed, so that the primary amplifying circuit amplifies the voltage signal of the circuit to be detected by a first multiple, the secondary amplifying circuit can amplify the voltage signal after the first multiple by a second multiple, the value of the voltage signal after the second multiple is amplified is raised by beta, beta can be a voltage value, and when the specific connection mode of the primary amplifying circuit and the secondary amplifying circuit is changed, the first multiple, the second multiple and beta can be changed.
As an alternative embodiment, a relay driving circuit includes: a control signal circuit and a reed relay; the control signal circuit comprises a triode, and the triode controls the reed relay to be electrified when a control instruction signal sent by the module chip is at a high level; the reed relay is powered on and is always closed by the open contact, and a circuit to be detected is connected into the primary amplifying circuit through the relay driving circuit under the condition that the normally open contact is closed.
As an alternative embodiment, a primary amplifying circuit includes: the differential capacitor is connected with the anti-reverse diode in parallel.
As an alternative embodiment, the secondary amplifying circuit includes: the operational amplifier circuit, the clamping diode and the filter capacitor; the operational amplifier circuit comprises an operational resistor and an operational amplifier, wherein a clamping diode and a filter capacitor are respectively connected with an output port of the operational amplifier circuit in parallel, and the output port of the operational amplifier circuit is used for outputting a sampling voltage value.
As a specific embodiment, fig. 3 is a schematic diagram of an alternative differential pressure detection circuit of a differential pressure detection module according to an embodiment of the present invention, as shown in fig. 3, when differential pressure detection is performed, a differential pressure detection module chip sends a control command signal G1 to change G1 into a high level state, so that transistors Q1 and Q2 are turned on, a relay driving circuit formed by transistors Q1 and Q2 makes current passing through a reed relay coil meet a conduction condition, a reed relay K1 is powered on, normally open contacts of the relay are closed, and terminals 1 and 9 are turned on, so as to realize connection of the differential pressure detection circuit. And after the current passes through the current limiting resistors R4 and R5 and the differential capacitor C1 and the anti-reverse diode D1 are connected in parallel, the primary amplifying circuit is connected with the isolation amplifier U1, the pins 2 and 3 of the isolation amplifier U are injected with the voltage to be detected, the output voltage difference of the isolation amplifier U1 is 8.2 times of the input voltage difference, and the primary differential signal amplification is completed. And the secondary amplifying circuit is used for continuously carrying out secondary amplification on the differential pressure signal after primary amplification, and amplifying the voltage by 3 times through an amplifying circuit consisting of a resistor and an operational amplifier, and raising the voltage by 0.625V. After the voltage signal amplified twice passes through a resistor R10, a clamping diode D2 and a filter capacitor C6 are connected in parallel and then output U s I.e. ADC_R1, at which time the voltage U is sampled s And an actual voltage U d The relation of (2) is:
so far, the whole differential pressure detection process is completed.
As an alternative embodiment, the charge control module includes: and the RS485 communication interface is used for being connected with the electric energy meter of the charging pile and obtaining the sampling current value of the direct current output loop of the charging pile from the electric energy meter.
Optionally, after the differential pressure detection module detects the sampling voltage value of the circuit to be detected in the direct current output loop, the detection device can obtain the sampling current value of the direct current output loop of the charging pile from the electric energy meter of the charging pile through an RS485 communication interface which is connected with the electric energy meter of the charging pile and is included by the charging control module, and calculate the equivalent internal resistance value of the circuit to be detected according to the sampling voltage value and the sampling current value. Specifically, the charging control module is provided with one path of RS485 communication interface and electric energy meter communication, receives the current value A of a direct current output loop sampled by the electric energy meter in real time, and acquires the voltage sampling value U of the differential pressure detection module through CAN communication s The equivalent internal resistance R of the detection loop can be calculated L ，
As an alternative embodiment, the charging control module determines whether the loop to be detected is faulty by: acquiring a first resistance threshold and a second resistance threshold corresponding to a circuit to be detected, wherein the first resistance threshold is smaller than the second resistance threshold; judging that the loop to be detected has no fault under the condition that the equivalent internal resistance is smaller than a first resistance threshold value; judging that an alarm condition exists in the loop to be detected under the condition that the equivalent internal resistance is larger than or equal to the first resistance threshold and smaller than the second resistance threshold; and under the condition that the equivalent internal resistance is larger than the second resistance threshold value, judging that the loop to be detected fails.
Optionally, after obtaining the equivalent internal resistance of the detection circuit, whether the detection circuit has a fault or not may be judged according to a preset first resistance threshold value and a preset second resistance threshold value. Judging that the loop to be detected has no fault under the condition that the equivalent internal resistance is smaller than a first resistance threshold value; judging that an alarm condition exists in the loop to be detected under the condition that the equivalent internal resistance is larger than or equal to the first resistance threshold and smaller than the second resistance threshold; judging to-be-detected under the condition that the equivalent internal resistance is larger than a second resistance threshold valueThe circuit fails. Specifically, taking the detection of the equivalent internal resistance of the dc output contactor K1 as an example, a control threshold may be set, the first resistance threshold is 100deg.M.OMEGA, the second resistance threshold is 500mΩ, and R is the same as that of L The following judgment is made: r is R L When the temperature is less than 100mΩ, the detection loop is regarded as safe; r is more than or equal to 100mΩ L When the temperature is less than 500mΩ, the charging control module sends out an alarm signal; r is R L And when the temperature is more than or equal to 500mΩ, the charging control module immediately controls the charging machine to stop when the circuit fault is detected.
According to another aspect of the embodiment of the present invention, there is further provided a charging pile, fig. 4 is a block diagram of a charging pile according to an embodiment of the present invention, and as shown in fig. 4, the charging pile 40 includes: the dc output circuit 42, the ammeter 44, and the detection device 10 according to any one of the above will be described below.
The differential pressure detection module of the detection device is in communication connection with a circuit to be detected in the direct current output loop and is used for acquiring the sampling voltage of the circuit to be detected; and the charging control module of the detection device is in communication connection with the electric energy meter and is used for acquiring the sampling current of the direct current output loop from the electric energy meter.
The invention further provides a charging pile provided with the detection device, wherein the charging pile further comprises a direct current output loop and an electric energy meter, the direct current output loop comprises a circuit to be detected, the electric energy meter can be connected with the direct current output loop to detect sampling current of the direct current output loop and is connected with the detection device, so that the detection device can acquire the sampling current, calculate equivalent internal resistance of the direct current output loop according to sampling voltage and sampling current, and judge whether the direct current output loop fails or not, and stable and safe operation of the charging pile is ensured.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
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 units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a non-volatile storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. Detection device of electric pile direct current output return circuit fills, a serial communication port includes: the device comprises a differential pressure detection module and a charging control module, wherein the differential pressure detection module is in communication connection with the charging control module;
the differential pressure detection module is used for being connected with a circuit to be detected in a direct current output loop of the charging pile and collecting a sampling voltage value of the circuit to be detected;
the charging control module is used for determining the equivalent internal resistance value of the loop to be detected according to the sampling voltage value acquired by the differential pressure detection module and the sampling current value of the direct current output loop of the charging pile;
and the charging control module is also used for judging whether the loop to be detected fails according to the equivalent internal resistance value and interrupting the charging process of the charging pile under the condition that the loop to be detected is judged to have the failure.
2. The apparatus of claim 1, wherein the differential pressure detection module comprises: the charging pile comprises a module chip, at least one path of differential pressure detection interface and at least one group of differential pressure detection circuits which are in one-to-one correspondence with the at least one path of differential pressure detection interface, wherein the differential pressure detection interface is used for connecting a circuit to be detected in the charging pile direct current output circuit, and the module chip is used for controlling the differential pressure detection circuits to work.
3. The apparatus of claim 2, wherein the differential pressure detection circuit comprises: a relay driving circuit, a primary amplifying circuit and a secondary amplifying circuit, wherein,
the relay driving circuit is used for controlling whether the circuit to be detected is connected with the primary amplifying circuit or not according to a control instruction signal sent by the module chip;
the primary amplifying circuit is used for isolating and amplifying the voltage signal input by the circuit to be detected;
and the secondary amplifying circuit is used for carrying out secondary amplification on the voltage signal obtained after the primary amplifying circuit is isolated and amplified, so as to obtain the sampling voltage value of the circuit to be detected.
4. A device according to claim 3, wherein the primary amplifying circuit is configured to amplify the voltage signal of the circuit to be detected by a first multiple; the secondary amplifying circuit is used for amplifying the voltage signal after the first multiple is amplified by a second multiple, and raising the value of the voltage signal after the second multiple is amplified by beta again.
5. A device according to claim 3, wherein the relay drive circuit comprises: a control signal circuit and a reed relay;
the control signal circuit comprises a triode, and the triode controls the reed relay to be electrified when a control instruction signal sent by the module chip is at a high level;
and when the reed relay is powered on, the normally open contact is closed, and the circuit to be detected is connected into the primary amplifying circuit through the relay driving circuit under the condition that the normally open contact is closed.
6. The apparatus of claim 3, wherein the primary amplifying circuit comprises: the differential capacitor is connected with the anti-reverse diode in parallel.
7. The apparatus of claim 3, wherein the secondary amplification circuit comprises: the operational amplifier circuit, the clamping diode and the filter capacitor;
the operational amplifier circuit comprises an operational resistor and an operational amplifier, wherein the clamping diode and the filter capacitor are respectively connected with an output port of the operational amplifier circuit in parallel, and the output port of the operational amplifier circuit is used for outputting the sampling voltage value.
8. The apparatus of claim 1, wherein the charge control module comprises: and the RS485 communication interface is used for being connected with an electric energy meter of the charging pile and obtaining a sampling current value of a direct current output loop of the charging pile from the electric energy meter.
9. The apparatus of claim 1, wherein the charge control module determines whether the circuit to be detected is malfunctioning by:
acquiring a first resistance threshold and a second resistance threshold corresponding to the circuit to be detected, wherein the first resistance threshold is smaller than the second resistance threshold;
judging that the loop to be detected has no fault under the condition that the equivalent internal resistance is smaller than the first resistance threshold value;
judging that the loop to be detected has an alarm condition under the condition that the equivalent internal resistance is larger than or equal to the first resistance threshold and smaller than the second resistance threshold;
and judging that the loop to be detected fails under the condition that the equivalent internal resistance is larger than the second resistance threshold.
10. A charging pile, comprising: a direct current output loop, an electric energy meter and the detection device of any one of claims 1-9; the differential pressure detection module of the detection device is in communication connection with a circuit to be detected in the direct current output loop and is used for acquiring the sampling voltage of the circuit to be detected; and the charging control module of the detection device is in communication connection with the electric energy meter and is used for acquiring the sampling current value of the direct current output loop from the electric energy meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211686193.1A CN116184066A (en) | 2022-12-27 | 2022-12-27 | Detection device of direct current output loop of charging pile and charging pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211686193.1A CN116184066A (en) | 2022-12-27 | 2022-12-27 | Detection device of direct current output loop of charging pile and charging pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116184066A true CN116184066A (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211686193.1A Pending CN116184066A (en) | 2022-12-27 | 2022-12-27 | Detection device of direct current output loop of charging pile and charging pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116184066A (en) |
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2022
- 2022-12-27 CN CN202211686193.1A patent/CN116184066A/en active Pending
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