CN110571884A - direct-current charger with online monitoring function of discharge loop and online monitoring method of discharge loop - Google Patents
direct-current charger with online monitoring function of discharge loop and online monitoring method of discharge loop Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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Abstract
The invention discloses a direct current charger with a function of online monitoring of a bleeder circuit, which comprises a contact position signal acquisition module and a temperature sampling module, wherein the contact position signal acquisition module is electrically connected with a control module and is used for acquiring a contact position signal of a bleeder relay; the fault types comprise over-temperature fault of the bleeder resistor, error throw fault of the bleeder relay and adhesion fault of the bleeder relay. Further, a corresponding online monitoring method of the bleeding circuit is also disclosed. The invention can detect the faults of adhesion and error switching of the discharge relay and abnormal temperature of the discharge resistor, and control the output of the charging module so as to ensure the safe operation of the direct current charger.
Description
Technical Field
The invention belongs to the technical field of electric automobile charging, and particularly relates to a direct-current charger with a discharge loop online monitoring function.
Background
The discharge loop is mainly used for discharging high-voltage electricity of the output main loop after the insulation detection and charging process is finished. The release circuit is thrown after insulation detection, so that high voltage electricity of the main circuit is released in a short time, communication interaction of the pile body and the vehicle charging handshake stage is completed, and accidental ending of the charging process due to communication overtime is avoided. After charging, the charger should discharge the charging output voltage in time through the discharge loop, so as to avoid electric shock injury to operators. According to the requirements of the GB/T18487.1-2015 standard, the parameters of the bleed circuit should be selected to ensure that the charging module output voltage drops below 60V DC within 1S after the charging connection is disconnected. The working performance of the discharge loop directly affects the safe operation state and the normal service life of the direct current charging equipment. The leakage circuit breaks down and not only leads to it can't accomplish the task of releasing, and the long-time main loop of carrying on of leakage circuit still can cause the generating heat of bleeder resistor, even gets on fire, consequently, has equipment and personal safety hidden danger and the risk of property loss.
The bleed circuit is generally composed of a controller, a bleed resistor, a bleed relay, and a relay contact position signal acquisition device. In the daily use, debugging and maintenance processes of the direct current charger, the generation of faults such as leakage relay adhesion, leakage relay mis-switching, over-high leakage resistance temperature and the like can generally occur, and the faults can cause the faults of a leakage loop, the damage of a resistor, even the serious safety accidents such as fire and the like. However, in the prior art, the fault detection function of the bleed-off loop is single, and the problem that the bleed-off relay is stuck can only be detected, and the problems of mistaken throwing of the bleed-off relay, overhigh temperature of the bleed-off resistor, corresponding fault alarm prompt and the like are not effectively solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the direct current charger with the online monitoring function of the discharge loop and the online monitoring method of the discharge loop, which can detect the faults of adhesion and error switching of the discharge relay and abnormal temperature of the discharge resistor, and control the output of the charging module so as to ensure the safe operation of the direct current charger.
The technical scheme adopted by the invention is as follows:
The first scheme is as follows: a direct current charger with a function of online monitoring of a discharge loop comprises a charging control module, a charging main loop and a discharge loop connected in parallel to the charging main loop, wherein the discharge loop comprises a discharge resistor and a discharge relay, and the charging main loop comprises a charging module; the device also comprises a contact position signal acquisition module and a temperature sampling module which are electrically connected with the charging control module; the contact position signal acquisition module is used for acquiring a contact position signal of the release relay and sending the contact position signal to the charging control module; the temperature sampling module is used for acquiring a surface temperature signal of the bleeder resistor in real time and sending the surface temperature signal to the charging control module; the charging control module is configured to judge whether the bleeding circuit has a fault and the fault type according to the received signals, and control to send a corresponding control instruction to the charging module or the bleeding relay and the charging module according to the fault type to make a corresponding response; the fault types comprise over-temperature fault of a bleeder resistor, error throw fault of a bleeder relay and adhesion fault of the bleeder relay.
as a preferred scheme, the charging control module is configured to judge whether the bleeding circuit has a fault and the type of the fault according to the received signal, and control to send a corresponding control instruction to the charging module or the bleeding relay and the charging module according to the type of the fault to make a corresponding response; the method specifically comprises the following steps: the charging control module compares the received surface temperature signal T of the bleed resistor with a preset threshold T1: and when T is greater than T1, judging that the over-temperature fault of the bleeder resistor occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected.
Preferably, the over-temperature fault of the bleeder resistor comprises a general over-temperature fault of the bleeder resistor and a serious over-temperature fault of the bleeder resistor; the charging control module is configured to judge whether the bleeder circuit has a fault and the fault type according to the received signal, and control to send a corresponding control instruction to the charging module or the bleeder relay and the charging module according to the fault type to make a corresponding response; the method specifically comprises the following steps: the charging control module compares the received surface temperature signal T of the bleeder resistor with preset thresholds T1, T2, T1 < T2: when T is more than T1 and less than or equal to T2, the general over-temperature fault of the bleeder resistor is judged, and a power reduction operation instruction is sent to the charging module; when T is larger than T2, the serious over-temperature fault of the bleeder resistor is judged, a shutdown instruction is sent to the charging module, and the main contact of the bleeder relay is controlled to be disconnected. T1 is preferably 55 ℃ and T2 is preferably 80 ℃.
As a preferred scheme, the power-down operation command includes at least two full-power reduction ranges corresponding to the specific temperature interval to which T belongs.
As a preferred scheme, the power-down operation instruction specifically includes: when T is more than T1 and less than or equal to T3, the output power is reduced to A% of the full power; when T is more than T3 and less than or equal to T2, the output power is reduced to B percent of the full power; t1 < T3 < T2. T3 is preferably 65 ℃, A is preferably 60 and B is preferably 30.
As a preferred scheme, the charging control module is configured to judge whether the bleeding circuit has a fault and the type of the fault according to the received signal, and control to send a corresponding control instruction to the charging module or the bleeding relay and the charging module according to the type of the fault to make a corresponding response; the method specifically comprises the following steps: the charging control module compares the received contact position signal to theoretical closing logic: if the contact position closing action is not detected to occur within t1 seconds after the insulation detection is finished or the charging process is finished, judging that the relay mis-throw fault occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; if the closing time of the contact position is monitored to be greater than t2 seconds, judging that the relay adhesion fault occurs, and sending a shutdown instruction to the charging module; t1 is preferably 1, and t2 is preferably 2.
as a preferred scheme, the direct current charger further comprises a current sampling module electrically connected with the charging control module; the current sampling module is connected in the discharge loop in series and used for collecting current signals in the discharge loop in real time and sending the current signals to the charging control module.
As a preferred scheme, the charging control module is configured to judge whether the bleeding circuit has a fault and the type of the fault according to the received signal, and control to send a corresponding control instruction to the charging module or the bleeding relay and the charging module according to the type of the fault to make a corresponding response; the method specifically comprises the following steps: the charging control module compares the received current signal with theoretical current timing logic of the bleed circuit: if the situation that the leakage circuit generates the circuit current at any moment in the charging process is monitored, the fault of the leakage relay is judged to be a fault of the leakage relay, a stop instruction is sent to the charging module, and meanwhile the main contact of the leakage relay is controlled to be disconnected.
As a preferred scheme, the direct current charger further comprises an alarm device electrically connected with the charging control module, and the alarm device is used for sending out a corresponding alarm prompt when the charging control module judges that a fault occurs; the alarm device comprises a fault display unit and a fault broadcasting unit. Preferably, the fault display unit can be realized by a touch display screen of the direct current charger, and the fault broadcast unit can be realized by a voice alarm of the direct current charger.
As a preferred scheme, the dc charger further includes a fault information storage device electrically connected to the charging control module, and configured to store corresponding fault information when the charging control module determines that a fault occurs. Preferably, the fault information storage device can be realized by a touch display screen of the direct current charger.
Scheme II: an online monitoring method of a discharge circuit is applied to a direct current charger with the online monitoring function of the discharge circuit; the direct current charger comprises a charging control module, a charging main loop and a discharging loop connected in parallel to the charging main loop, the discharging loop comprises a discharging resistor and a discharging relay, and the charging main loop comprises a charging module; the direct current charger also comprises a contact position signal acquisition module and a temperature sampling module which are electrically connected with the charging control module;
The contact position signal acquisition module acquires a contact position signal of the release relay and sends the contact position signal to the charging control module; the temperature sampling module collects surface temperature signals of the bleeder resistor in real time and sends the surface temperature signals to the charging control module;
The charging control module compares the received surface temperature signal T of the bleed resistor with a preset threshold T1: when T is larger than T1, judging that the over-temperature fault of the bleeder resistor occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected;
The charging control module compares the received contact position signal to theoretical closing logic: if the contact position closing action is not detected to occur within t1 seconds after the insulation detection is finished or the charging process is finished, judging that the relay mis-throw fault occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; and if the closing time of the contact position is monitored to be greater than t2 seconds, judging that the relay adhesion fault occurs, and sending a shutdown instruction to the charging module.
the third scheme is as follows: an online monitoring method of a discharge circuit is applied to a direct current charger with the online monitoring function of the discharge circuit; the direct current charger comprises a charging control module, a charging main loop and a discharging loop connected in parallel to the charging main loop, the discharging loop comprises a discharging resistor and a discharging relay, and the charging main loop comprises a charging module; the direct current charger also comprises a contact position signal acquisition module and a temperature sampling module which are electrically connected with the charging control module;
The contact position signal acquisition module acquires a contact position signal of the release relay and sends the contact position signal to the charging control module; the temperature sampling module collects surface temperature signals of the bleeder resistor in real time and sends the surface temperature signals to the charging control module;
The charging control module compares the received surface temperature signal T of the bleeder resistor with preset thresholds T1, T2, T1 < T2: when T is more than T1 and less than or equal to T2, the general over-temperature fault of the bleeder resistor is judged, and a power reduction operation instruction is sent to the charging module; when T is larger than T2, judging that the bleeder resistor has serious over-temperature fault, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected;
The charging control module compares the received contact position signal to theoretical closing logic: if the contact position closing action is not detected to occur within t1 seconds after the insulation detection is finished or the charging process is finished, judging that the relay mis-throw fault occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; and if the closing time of the contact position is monitored to be greater than t2 seconds, judging that the relay adhesion fault occurs, and sending a shutdown instruction to the charging module.
T1 is preferably 55 ℃ and T2 is preferably 80 ℃; t1 is preferably 1, and t2 is preferably 2.
As a preferred scheme, the power-down operation command includes at least two full-power reduction ranges corresponding to the specific temperature interval to which T belongs.
As a preferred scheme, the power-down operation instruction specifically includes: when T is more than T1 and less than or equal to T3, the output power is reduced to A% of the full power; when T is more than T3 and less than or equal to T2, the output power is reduced to B percent of the full power; t1 < T3 < T2. T3 is preferably 65 ℃, A is preferably 60 and B is preferably 30.
Based on the second scheme and the third scheme, the direct current charger further comprises a current sampling module electrically connected with the charging control module; the current sampling module is connected in series in the discharge loop, collects a current signal in the discharge loop in real time and sends the current signal to the charging control module; the charging control module compares the received current signal with theoretical current timing logic of the bleed circuit: if the situation that the leakage circuit generates the circuit current at any moment in the charging process is monitored, the fault of the leakage relay is judged to be a fault of the leakage relay, a stop instruction is sent to the charging module, and meanwhile the main contact of the leakage relay is controlled to be disconnected.
Based on the second scheme and the third scheme, the direct current charger further comprises an alarm device electrically connected with the charging control module, and the alarm device sends out a corresponding alarm prompt when the charging control module judges that a fault occurs; the alarm device comprises a fault display unit and a fault broadcasting unit.
based on the second and third schemes, the dc charger further includes a fault information storage device electrically connected to the charging control module, and configured to store corresponding fault information when the charging control module determines that a fault occurs.
Compared with the prior art, the invention has the following beneficial effects:
(1) The working condition of the bleeder resistor can be monitored in real time through the temperature real-time sampling function of the temperature sampling module, and whether an over-temperature fault exists is judged; the operation state of the relay can be monitored in real time through the contact position signal sampling module of the bleed-off relay, including the switching time point, switching duration and the like of a bleed-off loop, and whether the sticking or the mis-switching fault of the bleed-off relay occurs is judged; and when a fault occurs, the charging module and the release relay are controlled to timely make corresponding response actions so as to ensure the safe operation of the direct current charger.
(2) The over-temperature faults of the discharge resistor can be further subdivided according to actual conditions, the over-temperature faults are divided into general over-temperature faults and serious over-temperature faults, power-down operation instructions and stop instructions are sent out respectively, and the operation efficiency is guaranteed on the premise that the operation safety of the direct-current charger is guaranteed.
(3) the switching time point and the switching time length of a discharge loop can be observed in real time through the current signal real-time sampling function of the current sampling module, whether a fault of mistaken switching of the discharge relay exists or not is judged, and the function of the contact position signal sampling module can be enhanced.
(4) The fault voice broadcasting and displaying function and the fault information storage function can be integrated, so that the fault location and the fault type can be timely positioned, the fault information can be stored and read in real time, and the time node and the fault reason of the fault can be accurately positioned; in addition, through fault information storage and reading, the reasons of faults can be analyzed and summarized, later-stage accurate upgrading of a control program is facilitated, and the control program can be used as a model selection basis for subsequent components.
(5) Through current, temperature and contact position sampling signal, make the controller master the behavior of bleeder circuit, the controller real-time supervision its operation conditions of being convenient for masters its performance to in time make the module operation of shutting down according to the fault condition, prevent the trouble and worsen, protect the safe operation of organism.
Drawings
Fig. 1 is a schematic block circuit diagram of a charger with a function of online monitoring of a bleed-off loop in an embodiment;
Fig. 2 is a schematic diagram of a work flow of a charger with a function of online monitoring of a bleed-off loop in an embodiment.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention designs a direct current charger, which is provided with a fault detection and alarm device for monitoring the abnormal work of a discharge loop on line, judges the working condition of the discharge loop by acquiring working signals corresponding to all components in the discharge loop in real time, and makes corresponding fault alarm or shutdown response aiming at different fault types, thereby avoiding serious accidents such as direct current charger body operation accidents caused by the fault of the discharge loop or fire caused by overheat of a discharge resistor and the like, and ensuring the safe, efficient and stable operation of the direct current charger.
as shown in fig. 1, an embodiment of a direct current charger (charger for short) with a function of online monitoring of a bleed-off loop is disclosed, which mainly includes a charging controller 7, a charging main loop 1, a bleed-off loop, a signal acquisition unit, and an execution unit. The bleed-off circuit is mounted on the charging main circuit 1, and mainly includes a bleed-off resistor 3 and a bleed-off relay 4. The signal acquisition part comprises a contact position signal sampling module 5 for acquiring relay contact position signals, a current sampling module 6 for acquiring bleeder circuit current signals and a temperature sampling module 2 for acquiring bleeder resistor surface temperature signals. The execution unit mainly comprises a fault information storage module 9 and an alarm module 10, and the charging module 8 in the charging main circuit 1 can also be considered as a part of the execution unit here. The relevant modules in the execution part respond to the control instructions sent by the charging controller 7, and the control instructions comprise alarm prompting, charging stopping, message storage and the like.
The charging controller 7 reads the acquisition signals sent by each sampling module in the signal acquisition part, analyzes and judges the acquisition signals, generates corresponding control instructions and sends the control instructions to the execution part. The charging controller 7 is preferably Enzhipu chip LPC1768 which is an industrial grade ARM microcontroller supporting CAN, Ethernet and I2C. The universal serial bus interface has multiple interface types such as UART and USB, 165I/O ports which can be connected with a plurality of peripheral units, better environmental adaptability and normal work at-40 to +85 ℃.
The fault information storage module 9 is used for storing fault information, and may be implemented by a touch display screen (touch screen for short) provided in the charger, that is, storing the fault information in a memory of the touch screen. The touch screen can be directly connected with the charging controller 7 through the RS232 for communication. The storage capacity of the fault information is 500, and the fault information is automatically cleared after being stored fully, so that the memory is not occupied for a long time. After the fault is generated, technicians can inquire the fault history through the touch screen, read fault information, study fault content and analyze fault generation types and fault generation time so as to accurately position and troubleshoot the fault of the discharge circuit and facilitate later maintenance.
The alarm module 10 mainly includes a fault display unit and a voice alarm unit. In this embodiment, upgrading can be directly performed on the basis of the original equipment of the direct current charger, so that on one hand, a touch screen of the charger can be used for displaying fault alarms, and on the other hand, a voice broadcast speaker of the charger can be used for performing voice alarms.
Of course, in other embodiments, a corresponding hardware device may be separately provided to implement the fault storage function of the fault information storage module 9 and the alarm function of the alarm module 10. However, in consideration of the space and the overall cost of the charger cabinet body, the touch screen provided by the charger is used in the embodiment, and the memory and the functions of the touch screen completely meet the requirements.
Temperature sampling module 2 is as the core part that the temperature detected, and the upper surface of bleeder resistor 3 is pressed close to the simple and easy installing support of accessible, and together fixed mounting is on the inside components and parts mounting panel of machine that charges with bleeder resistor, real-time supervision bleeder resistor 3's surface temperature to the temperature data transmission who will gather sends to charge controller 7. The charging controller 7 compares the temperature sampling signal with a preset temperature threshold value, and generates a corresponding instruction signal to be output to the execution part, for example, the charging module 8 is controlled to stop, the alarm module 10 is controlled to start an alarm prompt, and the fault information storage device 9 is controlled to store temperature fault information. The temperature sampling module 2 can select temperature sensors such as a PT1000 resistor, an infrared temperature sensor, an NTC thermistor and the like, and preferably selects the PT1000 resistor.
Specifically, the temperature sampling module 2 collects the surface temperature T of the bleeder resistor 3 in real time and sends the surface temperature T to the charging controller 7, and the charging controller 7 compares the received temperature signal with a preset temperature threshold value, generates a corresponding instruction and sends the instruction to the charging module 8. The preset temperature threshold value generally comprises a safety threshold value T1 and a severe over-temperature threshold value T2, and through a large number of theoretical test verifications and long-term field use, the selection of the threshold values can be combined with the temperature power characteristic of a charging module and the temperature power regulation characteristic of a charging machine pile to select over-temperature fault points of the bleeder resistor, wherein the T1 can be 55 ℃, and the T2 can be 80 ℃. When T is more than 55 ℃ and less than or equal to 80 ℃, general over-temperature faults are judged, a power-down operation instruction is sent to the charging module 8, the charging module 8 responds to the instruction, power output is reduced, but the charging is still possible, meanwhile, the general over-temperature faults of the bleeder resistor are displayed on the touch screen, an alarm prompt tone is sent through a loudspeaker, and fault information is recorded in real time through the fault information storage module 9; when T is higher than 80 ℃, the serious over-temperature fault is judged, a shutdown instruction is sent to the charging module 8, the charging module 8 responds to the instruction, the output is stopped, the charging process is stopped, meanwhile, the main contact of the bleeder relay is controlled to be disconnected, namely, the power supply of a control coil of the bleeder relay 4 is cut off, the main contact of the relay is disconnected, the serious over-temperature fault of the bleeder resistor is displayed on a touch screen, an emergency alarm prompt sound is sent through a loudspeaker, and the fault information is recorded in real time through the fault information storage module 9. The power-down operation command may specifically include two kinds, that is, the preset temperature threshold further includes an intermediate threshold T3, and T3 is 65 ℃. When T is more than 55 ℃ and less than or equal to 65 ℃, the charging module 8 allows the output power to be 60% of the full power; when T is more than 65 ℃ and less than or equal to 80 ℃, the charging module 8 only allows the output power to be 30% of the full power.
in actual application, the control procedure may be simplified without considering the reduced power output. The preset temperature threshold comprises only a safety threshold T1, and when the surface temperature T > T1 of the bleeder resistor 3 is detected, a shutdown command is issued to the charging module 8.
The contact position signal sampling module 5 is used as a core part of contact position detection, and can be directly integrated on the charging controller 7, and a signal sampling port of the contact position signal sampling module can be a standby expansion port of the charging controller 7. And when the contact is closed, a high level is generated, otherwise, the contact is a low level, and the contact position signal sampling module 5 judges the closing condition of the contact position by collecting the rising edge signal of the voltage at the contact position. The release relay 4 acts, and the contact position signal sampling module 5 collects corresponding action signals and transmits the action signals to the charge controller 7 for logic judgment: when the relay contact is closed 1s after the insulation detection and the charging process are finished and is opened immediately after the relay contact is closed 2s, the action logic of the relay is not abnormal, otherwise, the relay is abnormal. If the abnormal condition occurs, the charging controller 7 sends a stop instruction to the charging module 8 to control the charging module 8 to stop charging, and simultaneously controls the alarm module 10 to send an alarm prompt, and the fault information storage module 9 stores the contact abnormal information.
Specifically, the contact position signal sampling module 5 collects a contact position signal, compares the contact position signal with theoretical logic, and determines that the fault of the bleed-off relay 8 caused by the mis-switching occurs if the contact position closing time is monitored not within 1s after the insulation detection is finished and the charging process is finished; and if the closing time of the contact position is monitored to be greater than 2s, judging that the leakage relay 8 has the adhesion fault. When the fault is judged, the charging controller 7 sends a shutdown instruction to the charging module 8, the charging module 8 responds to the instruction, the output is stopped, the charging process is stopped, meanwhile, the fault of the tapping relay 8 is mistakenly thrown or the adhesion fault is displayed on the touch screen, a prompt warning sound is sent out through a loudspeaker, the fault information is recorded by the fault information storage module 9 in real time, and the main contact of the tapping relay is controlled to be disconnected when the fault of the tapping relay is mistakenly thrown.
The current sampling module 6 is used as a core part of current detection, is connected in series in the main bleeding loop, detects the working current of the main bleeding loop in real time, and sends a current measurement value to the charge controller 7. The device is matched with the contact position signal sampling module 5 for use, the fault of the relay misthrow is judged, and when the current sampling module 6 detects the current of the bleed-off loop at any moment in the charging process, the fault of the bleed-off relay misthrow is judged. When a fault occurs in a fault of a fault throw, the charging controller 7 controls the main contact of the release relay to be disconnected, meanwhile, a shutdown instruction is issued to the charging module 8, the alarm prompting module 10 is started to alarm, and the fault information storage module 9 stores current abnormal fault information. The ACS758LCB-100B current sensor, the open type Hall direct current sensor and the like can be selected by the current sampling module 6, and the open type Hall direct current sensor is preferred.
specifically, the current sampling module 6 collects a current signal of the bleed-off loop in real time and sends the signal to the charging controller 7, if the current of the bleed-off loop is monitored in the charging process, the fault of the bleed-off relay is determined to be a fault of the bleed-off relay, the charging controller 7 controls the main contact of the bleed-off relay to be disconnected, and meanwhile, a shutdown instruction is sent to the charging module 8. The bleeder relay 4 responds to a main contact cutting instruction and is forcibly disconnected from a bleeder circuit, the charging module 8 responds to a stop instruction and stops outputting, the charging process stops, meanwhile, the touch screen is controlled to display the error throwing fault of the bleeder relay, the loudspeaker gives out an emergency alarm prompt sound, and the fault information storage module 9 records the fault information in real time.
It should be noted that both the current sampling module 6 and the contact position signal sampling module 5 can monitor the relay mis-switching fault occurring in the charging process, and have coincidence in function. The purpose of the invention can be realized through the temperature sampling module 2 and the contact position signal sampling module 5, and the optimal scheme of further supplementing and judging the fault of the. In addition, communication instructions between the charging controller and the charging module meet the requirements of a communication protocol between the off-board conductive charger and the battery management system of the electric vehicle in GB/T27930-2015, and details are not repeated here.
In practical application, each fault type can be represented by a fault code, as shown in fault information recorded in table 1, the fault type can be known by the fault code, and the fault code and the fault name can be displayed on the touch screen at the same time, so that the method is more intuitive.
TABLE 1
It should be noted that, in table 1, to avoid redundant display in practical application, D33 only indicates the over-temperature fault of the bleed-off resistor, and does not distinguish between general over-temperature and serious over-temperature, but only distinguishes between specific execution and alarm. When the device is actually used, the device can be distinguished and displayed according to requirements.
In summary, the invention is improved on the basis of the existing direct current charging circuit, designs a novel direct current charger with the online monitoring function of the discharge circuit, innovatively uses a detection mode with a closed loop circuit, and ensures the accuracy and dynamic flexibility of the fault detection and alarm device. The contact position signal acquisition module of the bleed-off relay monitors the position contact action condition of the bleed-off loop relay and detects the error throw and adhesion fault of the relay; the temperature sampling module monitors the surface temperature of the bleeder resistor in real time, and prevents extreme faults such as resistor overheating and firing; the current sampling module collects a current signal of a bleed-off loop and detects the fault of the bleed-off loop relay caused by error switching; the charging controller is in real-time communication with the charging module and controls the starting and stopping of the charging module according to the judged fault type; the alarm module has good man-machine interaction, can visually display fault information and send out voice alarm prompt; the fault information storage module can store fault information, and is convenient for later-stage troubleshooting of faults and accurate positioning of the faults.
Further, the present invention also discloses an online monitoring method for a bleed-off circuit, which is applied to the above dc charger with the online monitoring function for a bleed-off circuit, and the specific working principle is explained in the above embodiments, which is not described herein again.
the above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A direct current charger with a function of online monitoring of a discharge loop comprises a charging control module, a charging main loop and a discharge loop connected in parallel to the charging main loop, wherein the discharge loop comprises a discharge resistor and a discharge relay, and the charging main loop comprises a charging module; the method is characterized in that: the device also comprises a contact position signal acquisition module and a temperature sampling module which are electrically connected with the charging control module; the contact position signal acquisition module is used for acquiring a contact position signal of the release relay and sending the contact position signal to the charging control module; the temperature sampling module is used for acquiring a surface temperature signal of the bleeder resistor in real time and sending the surface temperature signal to the charging control module; the charging control module is configured to judge whether the bleeding circuit has faults and fault types according to the received signals, and control the charging module or the bleeding relay and the charging module to make corresponding responses according to the fault types; the fault types comprise over-temperature fault of a bleeder resistor, error throw fault of a bleeder relay and adhesion fault of the bleeder relay.
2. The direct current charger according to claim 1, wherein the charging control module is configured to determine whether the bleeding circuit has a fault and a fault type according to the received signal, and to control the charging module or the bleeding relay and the charging module to send a corresponding control command according to the fault type to make a corresponding response; the method specifically comprises the following steps:
the charging control module compares the received surface temperature signal T of the bleed resistor with a preset threshold T1: when T is larger than T1, judging that the over-temperature fault of the bleeder resistor occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; t1 is preferably 55 ℃.
3. The direct current charger according to claim 1, characterized in that the over-temperature fault of the bleed-off resistor includes a general over-temperature fault of the bleed-off resistor and a serious over-temperature fault of the bleed-off resistor; the charging control module is configured to judge whether the bleeder circuit has a fault and the fault type according to the received signal, and control to send a corresponding control instruction to the charging module or the bleeder relay and the charging module according to the fault type to make a corresponding response; the method specifically comprises the following steps:
The charging control module compares the received surface temperature signal T of the bleeder resistor with preset thresholds T1, T2, T1 < T2: when T is more than T1 and less than or equal to T2, the general over-temperature fault of the bleeder resistor is judged, and a power reduction operation instruction is sent to the charging module; when T is larger than T2, judging that the bleeder resistor has serious over-temperature fault, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; t1 is preferably 55 ℃ and T2 is preferably 80 ℃.
4. The direct current charger according to claim 3, wherein the power-down operation command includes at least two full power reduction ranges corresponding to a specific temperature interval to which T belongs; preferably, the power-down operation instruction specifically includes:
When T is more than T1 and less than or equal to T3, the output power is reduced to A% of the full power; when T is more than T3 and less than or equal to T2, the output power is reduced to B percent of the full power; t1 < T3 < T2; t3 is preferably 65 ℃, A is preferably 60 and B is preferably 30.
5. the direct current charger according to claim 1, wherein the charging control module is configured to determine whether the bleeding circuit has a fault and a fault type according to the received signal, and to control the charging module or the bleeding relay and the charging module to send a corresponding control command according to the fault type to make a corresponding response; the method specifically comprises the following steps:
The charging control module compares the received contact position signal to theoretical closing logic: if the contact position closing action is not detected to occur within t1 seconds after the insulation detection is finished or the charging process is finished, judging that the relay mis-throw fault occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; if the closing time of the contact position is monitored to be greater than t2 seconds, judging that the relay adhesion fault occurs, and sending a shutdown instruction to the charging module; t1 is preferably 1, and t2 is preferably 2.
6. The direct current charger according to claim 1, characterized by further comprising a current sampling module electrically connected to the charging control module; the current sampling module is connected in the discharge loop in series and used for collecting current signals in the discharge loop in real time and sending the current signals to the charging control module.
7. The direct current charger according to claim 6, wherein the charging control module is configured to determine whether the bleeding circuit has a fault and a fault type according to the received signal, and control the charging module or the bleeding relay and the charging module to send a corresponding control command according to the fault type to make a corresponding response; the method specifically comprises the following steps:
The charging control module compares the received current signal with theoretical current timing logic of the bleed circuit: if the situation that the leakage circuit generates the circuit current at any moment in the charging process is monitored, the fault of the leakage relay is judged to be a fault of the leakage relay, a stop instruction is sent to the charging module, and meanwhile the main contact of the leakage relay is controlled to be disconnected.
8. the direct current charger according to claim 1, further comprising an alarm device electrically connected to the charging control module, for sending a corresponding alarm prompt when the charging control module determines that a fault occurs; the alarm device comprises a fault display unit and a fault broadcasting unit.
9. the direct current charger according to claim 1, further comprising a fault information storage device electrically connected to the charging control module, for storing corresponding fault information when the charging control module determines that a fault occurs.
10. The online monitoring method of the discharge circuit is characterized by being applied to a direct-current charger with the online monitoring function of the discharge circuit; the direct current charger comprises a charging control module, a charging main loop and a discharging loop connected in parallel to the charging main loop, the discharging loop comprises a discharging resistor and a discharging relay, and the charging main loop comprises a charging module; the direct current charger also comprises a contact position signal acquisition module and a temperature sampling module which are electrically connected with the charging control module;
the contact position signal acquisition module acquires a contact position signal of the release relay and sends the contact position signal to the charging control module; the temperature sampling module collects surface temperature signals of the bleeder resistor in real time and sends the surface temperature signals to the charging control module; the charging control module compares the received surface temperature signal T of the bleed resistor with a preset threshold T1: when T is larger than T1, judging that the over-temperature fault of the bleeder resistor occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected;
The charging control module compares the received contact position signal to theoretical closing logic: if the contact position closing action is not detected to occur within t1 seconds after the insulation detection is finished or the charging process is finished, judging that the relay mis-throw fault occurs, sending a shutdown instruction to the charging module, and simultaneously controlling the main contact of the bleeder relay to be disconnected; and if the closing time of the contact position is monitored to be greater than t2 seconds, judging that the relay adhesion fault occurs, and sending a shutdown instruction to the charging module.
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| CN113839445A (en) * | 2021-10-14 | 2021-12-24 | 阳光电源股份有限公司 | Control method and control device of direct-current power supply and direct-current power supply |
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Application publication date: 20191213 |