CN117134303A - Initialization method of intelligent contactor - Google Patents
Initialization method of intelligent contactor Download PDFInfo
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- CN117134303A CN117134303A CN202311406805.1A CN202311406805A CN117134303A CN 117134303 A CN117134303 A CN 117134303A CN 202311406805 A CN202311406805 A CN 202311406805A CN 117134303 A CN117134303 A CN 117134303A
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- 238000011423 initialization method Methods 0.000 title claims abstract description 36
- 239000004065 semiconductor Substances 0.000 claims abstract description 172
- 238000001514 detection method Methods 0.000 claims description 33
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims 1
- 230000000875 corresponding effect Effects 0.000 description 23
- 230000002159 abnormal effect Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 230000006870 function Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 206010000117 Abnormal behaviour Diseases 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- 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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2843—In-circuit-testing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses an initialization method of an intelligent contactor, wherein the intelligent contactor is arranged between a load and a battery, the intelligent contactor comprises a main control module, a contactor, a booster circuit and a load identification circuit, wherein the booster circuit and the load identification circuit are arranged in parallel with the contactor, the booster circuit comprises a first semiconductor switch, a resistor and a first control module, the load identification circuit comprises a second semiconductor switch and a second control module, the initialization method comprises the main control module initializing the intelligent contactor, the booster circuit and the load identification circuit, detecting faults of a loop formed by the battery, the load identification circuit and the load, and detecting load types; according to the load type, the battery boosts the load through the booster circuit, and through initializing and detecting the circuit, safety accidents caused by spark arcing and the like due to the fact that a large amount of heat is generated by load short circuit and line contact is poor are prevented, the corresponding control signal is adopted to control the semiconductor switch to boost the load, electric arcs can not occur, and the problem of contact adhesion is avoided.
Description
Technical Field
The invention relates to the technical field of contactors, in particular to an initialization method of an intelligent contactor.
Background
In the prior art, a contactor is usually arranged between a battery and a load, when a circuit switch is closed, the battery end is in a high-voltage state, the voltage of the load end is approximately 0, the circuit is equivalent to instant short circuit, the loop resistance is a contact resistance with a small resistance value, and the ohm law proves that the main positive relay can generate extremely large current in an instant loop when being closed, so that an electric arc is generated when contacts of the main positive relay are in contact, and the relay is damaged easily. In order to protect the circuit and components, the existing solution is to connect a switching circuit in parallel across the contactor, and adjust the switching circuit to reduce the voltage difference across the battery and the load capacitor, so that the arc generated when the main positive relay is closed is smaller. But this solution has the following problems:
when a device in the switching circuit has faults, the circuit damage can be caused to the circuit on the switching circuit, an arc can be generated when contacts of a switch in the switching circuit are contacted, the switch is easy to damage due to long-time work, and the replacement cost is high.
Disclosure of Invention
The embodiment of the invention provides an initialization method of an intelligent contactor, which aims to solve the technical problems in the prior art.
The first aspect of the invention provides an initialization method of an intelligent contactor, wherein the intelligent contactor is arranged between a load and a battery, and comprises a main control module, a contactor, a boosting circuit and a load identification circuit, wherein the boosting circuit and the load identification circuit are arranged in parallel with the contactor; the boost circuit comprises a first semiconductor switch, a resistor and a first control module, wherein the first semiconductor switch and the resistor are connected in series, and the first control module is connected with the first semiconductor switch; the load identification circuit comprises a second semiconductor switch and a second control module, the second control module is connected with the second semiconductor switch, and the main control module is connected with the first control module, the second control module and the contactor;
The initialization method comprises the following steps:
the main control module performs initialization detection on the main control module, the booster circuit and the load identification circuit;
when the initialization is completed, the main control module controls the second control module to enable the second semiconductor switch to be conducted for a first preset time so as to perform fault detection on a loop formed by the battery, the load identification circuit and the load;
when the fault detection passes, the main control module controls the second control module to enable the second semiconductor switch to be conducted for a second preset time so as to detect the type of the load;
the main control module controls the first control module to output a control signal corresponding to the load type according to the load type, so that the boost circuit is conducted to adjust the pressure difference between the battery and the load to a preset voltage range.
The second aspect of the invention provides an initialization method of an intelligent contactor, wherein the intelligent contactor is arranged between the load and the battery, and comprises a main control module, a contactor, a boosting circuit and a load identification circuit, wherein the boosting circuit and the load identification circuit are arranged in parallel with the contactor; the boost circuit comprises a first semiconductor switch, a resistor, a first control module, a third semiconductor switch and a third control module, wherein the first semiconductor switch, the resistor and the third semiconductor switch are connected in series, the first control module is connected with the first semiconductor switch, the third control module is connected with the third semiconductor switch, the load identification circuit comprises a second semiconductor switch, a second control module, a fourth semiconductor switch and a fourth control module, the second semiconductor switch and the fourth semiconductor switch are connected in series, the second control module is connected with the second semiconductor switch, the fourth control module is connected with the fourth semiconductor switch, and the main control module is connected with the first control module, the second control module, the third control module, the fourth control module and the contactor;
The initialization method comprises the following steps:
the main control module initializes itself, the booster circuit and the load identification circuit;
when the initialization is completed, the main control module respectively controls the second control module and the fourth control module to enable the second semiconductor switch and the fourth semiconductor switch to be conducted for a first preset time so as to perform fault detection on a loop formed by the battery, the load identification circuit and the load;
when the fault detection passes, the main control module respectively controls the second control module and the fourth control module to enable the second semiconductor switch and the fourth semiconductor switch to be conducted for a second preset time so as to detect the type and the current direction of the load;
the main control module controls the first control module or the third control module to output a control signal corresponding to the load type according to the load type and the current direction, so that the boost circuit is conducted to adjust the pressure difference between the battery and the load to a preset voltage range.
The technical effects of the embodiment of the invention are as follows: through carrying out the initial detection to the device in the intelligent contactor to and detect whether the load is unusual, if detect load or circuit abnormality, do not carry out the power on, prevent that the load short circuit from producing a large amount of heats and circuit contact failure and lead to the incident that spark arc etc. caused, adopt the control signal control semiconductor switch that corresponds with the load type to boost pressure to the load, the electric arc can not appear in this process, there is not contact adhesion problem, carry out comprehensive detection to the device before the formal work of intelligent contactor, can guarantee the normal clear of follow-up work and refused work after abnormal condition appears, avoid producing the damage to the main contactor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an intelligent contactor according to a first embodiment of the present invention;
fig. 2 is a flowchart of an initialization method of an intelligent contactor according to an embodiment of the present invention;
fig. 3 is a flowchart of step S101 in an initialization method of an intelligent contactor according to an embodiment of the present invention;
fig. 4 is another flowchart of step S101 in an initialization method of an intelligent contactor according to an embodiment of the present invention;
fig. 5 is a flowchart of step S102 in an initialization method of an intelligent contactor according to an embodiment of the present invention;
fig. 6 is a flowchart of step S122 in an initialization method of an intelligent contactor according to an embodiment of the present invention;
fig. 7 is a flowchart of step S103 in an initialization method of an intelligent contactor according to the first embodiment of the present invention;
Fig. 8 is a flowchart of step S132 in an initialization method of an intelligent contactor according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an intelligent contactor according to a third embodiment of the present invention;
fig. 10 is a flowchart of an initialization method of an intelligent contactor according to a third embodiment of the present invention;
fig. 11 is a circuit diagram of an intelligent contactor according to a second embodiment of the present invention;
fig. 12 is a circuit diagram of a main control module of an intelligent contactor according to a second embodiment of the present invention;
in the figure: 100. a control module; 101. a battery; 102. a load; 103. a first semiconductor switch; 104. a resistor; 105. a first control module; 107. a third semiconductor switch; 108. a third control module; 111. a second semiconductor switch; 112. a second control module; 113. a fourth semiconductor switch; 114. and a fourth control module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. 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.
It should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.
It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for the purpose of providing a thorough understanding of the present invention, detailed structures and steps are presented in order to illustrate the technical solution presented by the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to these detailed descriptions.
Example 1
The embodiment of the invention provides an initialization method of an intelligent contactor, which aims to solve the problem that a circuit is damaged when a booster circuit is electrified when a device in the intelligent contactor has faults in the prior art.
According to the technical scheme provided by the embodiment of the invention, as shown in fig. 1, in the method for initializing the intelligent contactor, the intelligent contactor is arranged between a battery 101 and a load 102, the intelligent contactor comprises a main control module 100, a contactor 110, a boost circuit and a load identification circuit, wherein the boost circuit and the contactor 110 are arranged in parallel, the boost circuit comprises a first semiconductor switch 103, a resistor 104 and a first control module 105, the first semiconductor switch 103 and the resistor 104 are connected in series, the first control module 105 is connected with the first semiconductor switch 103, the load identification circuit comprises a second semiconductor switch 111 and a second control module 112, the second control module 112 is connected with the second semiconductor switch 111, and the main control module 100 is connected with the first control module 105, the second control module 112 and the contactor 110.
The battery 101 is used for storing electric energy, the load 102 is used for acquiring energy from the battery 101 and performing actual working equipment or devices, the switch circuit is a circuit for connecting the battery 101 and the load 102, the current flowing in the switch circuit is controlled through the state of the contactor 110, the contactor 110 is used for controlling the connection and disconnection of the switch circuit, the voltage boosting circuit is connected between the battery 101 and the load 102, the initial current is limited through the resistor 104, preset voltages are formed at two ends of the contactor 110 so as to avoid damage caused by large current striking the contactor 110, the first semiconductor switch 103 is arranged in the voltage boosting circuit and used for controlling the connection and disconnection of the voltage boosting circuit, the resistor 104 is used for adjusting the current in the voltage boosting circuit, the voltage difference is gradually and stably established between the battery 101 and the load 102, the first semiconductor switch 103 is controlled by the first control module 105, the current in the voltage boosting circuit can be adjusted according to the requirement, the load identification circuit is a circuit module for monitoring the states of the battery 101, the load 102 and the circuit, the second semiconductor switch 111 is used for enabling the module 100 to monitor the states of the battery 101, the load 102 and the circuit through pre-conduction, the second control module 111 is responsible for achieving the states of the monitoring of the states of the battery 101, the load 102 and the circuit, the connection and disconnection of the second control module is used for the second control module 111 is used for enabling the whole semiconductor switch 111 to be started or the complete control and the complete control of the main control module can be started or can be coordinated to be started or disconnected according to the main control and the functions.
As shown in fig. 2, an initialization method of a power distribution system includes:
step S101, the main control module initializes itself, the booster circuit and the load identification circuit.
Step S102, when the initialization is completed, the main control module controls the second control module to enable the second semiconductor switch to be conducted for a first preset time so as to perform fault detection on a loop formed by the battery, the load identification circuit and the load.
Step S103, when the fault detection passes, the main control module controls the second control module to enable the second semiconductor switch to be conducted for a second preset time so as to detect the type of the load.
Step S104, the main control module controls the first control module to output a control signal corresponding to the load type according to the load type, so that the boost circuit is conducted to adjust the pressure difference between the battery and the load to a preset voltage range.
The step S101 includes performing an initialization detection on the control module itself and performing an initialization detection on the booster circuit and the load identification circuit.
As an embodiment, as shown in fig. 3, the main control module performs initialization detection on the main control module, including:
step S111, the main control module performs integrity check on the user firmware and the configuration parameters.
Step S112, when the user firmware and the configuration parameters meet the integrity check, the initialization test is judged to be completed.
And S113, when the user firmware and the configuration parameters do not meet the integrity check, recovering the data of the user firmware and the configuration parameters from the backup area, and judging that the initialization is finished.
Wherein at the beginning of the initialization process, the main control module will first load the user firmware from a certain storage medium (e.g. flash memory). The firmware integrity check is to ensure that the user firmware is not damaged or tampered with during transmission or storage, and the integrity check method includes Checksum (Checksum), hash function (Hash), and the like. The main control module calculates a checksum or hash value of the user firmware and compares it with a pre-stored checksum to ensure the integrity of the firmware. To improve reliability, the user firmware uses a dual backup strategy, i.e., two identical copies of firmware are stored to prevent one from being corrupted. During the verification process, the checksum or hash values of the two backups may be compared and if corrupted, restored from the backup area.
Wherein the configuration parameters of the main control module generally affect the behavior and performance of the system. These parameters may include clock frequency, communication protocol settings, pin assignment, etc. During the initialization process, the main control module reads the configuration parameters and detects them. The validity detection is to ensure that the value of the configuration parameter is within an allowable range, so as to avoid abnormal behavior. The integrity check is to confirm that all necessary configuration parameters have been set correctly to prevent the system from failing to operate properly due to missing parameters. If an outlier is found in the validity check or a missing configuration parameter is found in the integrity check, the system needs to handle the exception. One way of doing this is to restore the configuration parameters from the backup area. The backup area typically stores configuration information of the last successful run. The system will read the backed-up configuration parameters and apply them to the current initialization process to ensure that the system is started in a reliable manner.
The technical effects of the steps are as follows: by checking the integrity of the user firmware, detecting the validity and the integrity of the configuration parameters, and recovering the configuration parameters from the backup area, the abnormal condition of the control module in the starting process can be reduced to the greatest extent, and the control module can be ensured to operate in a correct state.
As an embodiment, as shown in fig. 4, the main control module initializes the booster circuit and the load recognition circuit, and includes:
step S114, the main control module obtains configuration parameters, working state parameters and received external signals of each module in the booster circuit and the load identification circuit.
Step S115, when the configuration parameter, the working state parameter and the received external signal all meet the preset conditions, the step-up circuit and the load identification circuit are judged to finish initialization.
Step S116, when one of the configuration parameter, the working state parameter and the received external signal does not meet the preset condition, the step-up circuit and the load identification circuit are judged to be not initialized.
In the process of initializing the booster circuit and the load identification circuit by the main control module, the main control module detects each functional unit in the circuit one by one according to the configuration parameters. For each functional unit, the main control module executes a corresponding self-test program, including sending test instructions, executing self-test routines within the functional unit, and the like. The self-test routine may include self-test of the hardware circuitry, detection of internal states, etc. For example, for the control module, test data may be sent and checked for receipt of an expected response, and for the switch module, detection may be performed by controlling the switch module to conduct to obtain the battery output current. If the self-test fails, the system may take corresponding action, such as logging, raising an alarm, attempting an automatic repair, etc.
The main control module monitors the working voltage and the working temperature of each module. The main control module may measure the operating voltage and operating temperature via analog inputs, sensors, or other circuitry. The detected voltage and temperature values are compared with preset legal ranges. If out of range, the main control module may take action such as reducing power, triggering an emergency shutdown, etc.
The external signal comes from the output of the main control module, and the main control module verifies the sent control signal to ensure the validity and effectiveness of the control signal. Legitimacy detection may involve checking the format, range, frequency, etc. of the signal. Validity detection involves verifying whether a signal arrives within a reasonable time and is consistent with the expected state of the system. For the switch module, the input may be simulated and verified for the output to be expected, and if an illegal or invalid signal is detected, the system may perform error handling such as rejecting the signal, sending an alarm, etc.
The technical effects of the steps are as follows: the voltage boosting circuit and the load identification circuit are subjected to initialization detection, so that potential problems can be found in time when the system is started, the reliability of the system is improved, and the follow-up operation is prevented from being influenced by faults. The detection of the working voltage and temperature and the legitimacy of external signals can ensure that the system is kept in a safe range during operation, and the problems of overhigh voltage, overlow voltage, abnormal temperature and the like are prevented. If abnormal conditions exist, the system can take measures in time, and further expansion of the problems is avoided.
As an embodiment, as shown in fig. 5, step S102 includes:
s121, the main control module controls the second control module to output PWM control signals to the second semiconductor switch in the first preset time.
S122, the main control module acquires a current signal output by the battery, compares a parameter value of the current signal with a reference value, and judges the fault state of a loop formed by the battery, the load identification circuit and the load according to a comparison result.
As shown in fig. 6, step S122 includes:
s123, comparing the amplitude of the current signal with a preset reference amplitude range, and comparing the frequency value of the current signal with a preset reference frequency range.
And S124, when the amplitude of the current signal is in the preset reference amplitude range and the frequency value of the current signal is in the preset reference frequency range, determining that a loop formed by the battery, the load identification circuit and the load is in a normal state.
And S125, when the amplitude of the current signal is not in the preset reference amplitude range and/or the frequency value of the current signal is not in the preset reference frequency range, judging that a loop formed by the battery, the load identification circuit and the load is in a fault state.
Wherein, in step S121, the main control module initiates a control operation for the second control module. The main control module sets a first preset time, which is a shorter time, during which the related operation is performed. And in a second preset time, the main control module controls the second control module to output a PWM (pulse width modulation) control signal to the second semiconductor switch. In step S122, the main control module starts acquiring a current signal output from the battery. The main control module measures the value of the current signal via a sensor or other circuit element. The main control module compares the parameter value of the current signal with a preset reference value. In step S124, it is determined that the loop formed by the battery, the load identification circuit and the load is in a normal state when the amplitude of the current signal is smaller than the reference amplitude and the frequency value of the current signal is smaller than the reference frequency value. In step S125, for the fault state determination, when the amplitude of the current signal is not less than the reference amplitude and/or the frequency value of the current signal is not less than the reference frequency value, the main control module determines that the battery, the load identification circuit, and the loop formed by the load are in the fault state.
The technical effects of the steps are as follows: through the contrast analysis of current signal, main control module can the automated inspection battery, load identification circuit and load return circuit have the trouble, and this fault state can judge rapidly, and main control module can respond fast to reduce the influence that arouses because of the trouble. The main control module can know the state of the loop in real time by continuously detecting the current signal, thereby being beneficial to monitoring and maintaining the state of the circuit, and the automatic fault detection can prevent the system from continuously running in the fault state and improve the reliability of the system.
As an embodiment, as shown in fig. 7, step S103 includes:
step S131, the main control module controls the second control module to output square wave control signals to the second semiconductor switch in a second preset time;
step S132, the main control module obtains a current signal output by the battery and obtains a load type according to the current signal.
Further, as shown in fig. 8, obtaining the load type according to the current signal includes:
step S133, comparing the current signal with the square wave signal.
And step S134, when the current signal is consistent with the square wave signal, the load is judged to be a resistor.
And S135, when the current signal is a sawtooth wave signal transformed by following the rising edge waveform of the square wave, the load is judged to be an inductor.
And step 136, when the current signal is a spike signal gradually decaying along the rising edge of the square wave, the load is judged to be a capacitor.
Wherein, in step S131, the main control module starts a control operation of the second control module. The main control module sets a second preset time, and the follow-up operation is executed in the second preset time. The second preset time is a shorter time, and in the second preset time, the main control module sends an instruction to the second control module to require the second control module to output a square wave control signal. In step S132, the main control module starts to acquire a current signal output from the battery, and the main control module measures a value of the current signal through a sensor or other circuit element. The main control module judges the type of the load, namely whether the connected load is a resistor, an inductor or a capacitor through analysis of the current signal. In step S133, the main control module compares the current signal with a square wave signal. A square wave signal is a predefined signal having a specific frequency and duty cycle. When the current signal matches the square wave signal, the main control module determines that the load is a resistor in step S134. When the current signal is a sawtooth signal transformed following the rising edge waveform of the square wave, in step S135, the main control module determines that the load is an inductance. When the current signal is a spike signal that gradually decays following the rising edge of the square wave, in step S126, the main control module determines the load as a capacitor.
The technical effects of the present embodiment are as follows: the main control module can automatically identify the type of the load, namely resistance, inductance or capacitance by comparing the current signal with the square wave signal, and can judge the type of the load according to the waveform shape and the transformation mode of the specific waveform.
As an implementation manner, in step S104, the main control module may control the first control module to output a control signal corresponding to the load type according to the load type, including:
when the load type is a resistor, the first control module is controlled to output a first PWM control signal to the first semiconductor switch; when the load type is inductance, the first control module is controlled to output a second PWM control signal to the first semiconductor switch; when the load type is a capacitor, the first control module is controlled to output a third PWM control signal to the first semiconductor switch; the duty ratio of the second PWM control signal, the duty ratio of the first PWM control signal and the duty ratio of the third PWM control signal are sequentially increased.
The duty ratio of the second PWM control signal is lower, and the second PWM control signal is suitable for an inductive load. The duty cycle of the first PWM control signal is slightly higher than that of the second PWM signal, and the first PWM control signal is suitable for a resistance load. The third PWM control signal has the highest duty cycle and is suitable for capacitive loads. The corresponding relation can be measured according to a specific experimental mode, and the switch module can be ensured not to be adhered.
As another embodiment, in step S104, the main control module may control the first control module to output a control signal corresponding to the load type according to the load type, including:
when the load type is detected to be a capacitor, the first control module is controlled to output a PWM control signal with a first duty ratio to the first semiconductor switch, wherein the first duty ratio is more than 0 and less than 1;
when the detected load type is other loads, the first control module is controlled to output a PWM control signal with the duty ratio of 1 to the first semiconductor switch.
The embodiment has an intelligent load type detection function, can automatically adjust a control signal according to the connected load type, divides the load into a capacitor and a non-capacitor load for simplifying a control strategy, and can control the discharging speed of a battery to the capacitor by adjusting the duty ratio of a PWM signal for the capacitor load so as to meet specific requirements. For other loads, full voltage output can be provided to speed up the discharge speed to meet the load demands that do not require PWM control. The implementation mode can be used in different types of applications to meet the requirements of different loads, and the flexibility and applicability of the circuit are improved.
The technical effects of the present embodiment are as follows: different types of loads need different control strategies, and by outputting different PWM control signals, the system can realize more accurate control according to the load types. The duty ratio of the PWM signal is adjusted according to the load type, so that energy can be utilized to the greatest extent, the energy efficiency of the system is improved, the system automatically adjusts the control signal according to the load type, manual intervention is not needed, the system is suitable for different working scenes, the corresponding control signal is adopted to control the semiconductor switch to boost the load, an arc does not occur in the process, and the problem of contact adhesion is avoided.
As an embodiment, the step S104 of turning on the boost circuit to adjust the voltage difference between the battery and the load to the preset voltage range includes:
the boost circuit is turned on by the first control module outputting a PWM control signal to regulate a voltage differential between the battery and the load to less than 10%.
The main control module acquires battery voltage and load voltage, and the first control module outputs a PWM control signal and detects the change of the load voltage until the pressure difference between the battery and the load is less than 10%, and controls the first control module to stop outputting the PWM control signal.
The technical effects of the present embodiment are as follows: the voltage difference between the battery and the load can be adjusted, and by using a PWM (pulse width modulation) control signal, accurate control of the booster circuit can be achieved. The pulse width of the PWM signal can be adjusted, so that the on time of the boost circuit is adjusted, and the voltage difference is adjusted. The main control module monitors the change of load voltage, can sense the change condition of voltage difference in real time, once the voltage difference between the battery and the load is smaller than a preset value, the first control module can stop outputting PWM signals, so that the boost circuit is stopped from being conducted, and the automatic stopping mechanism can avoid excessive regulation and ensure accurate regulation in a required range.
The first embodiment has the technical effects that: through carrying out the initial detection to the device of circuit to and detect whether the load is unusual, if detect load or circuit abnormality, do not carry out the power on, prevent that the load short circuit from producing a large amount of heats and line contact failure from leading to the incident that spark draws arc etc. to cause, adopt corresponding control signal control semiconductor switch to precharge the load, this process can not appear electric arc, there is not contact adhesion problem, the intelligent contactor carries out comprehensive detection to the device before formally working, can guarantee the normal clear of follow-up work and refuses the work after abnormal condition appears, avoid producing the damage to intelligent contactor.
Example two
In a second embodiment, as shown in fig. 9, the intelligent contactor is disposed between a load and the battery, the intelligent contactor includes a main control module 100, a contactor 110, and a boost circuit and a load identification circuit disposed in parallel with the contactor 110, the boost circuit includes a first semiconductor switch 103, a resistor 104, a first control module 105, a third semiconductor switch 107, and a third control module 108, the first semiconductor switch 103, the resistor 104, and the third semiconductor switch 107 are connected in series, the first control module 105 is connected to the first semiconductor switch 103, the third control module 108 is connected to the third semiconductor switch 107, the load identification circuit includes a second semiconductor switch 111, a second control module 112, a fourth semiconductor switch 113, and a fourth control module 114, the second semiconductor switch 111 and the fourth semiconductor switch 113 are connected in series, the second control module 112 is connected to the second semiconductor switch 111, the fourth control module 114 is connected to the fourth semiconductor switch 113, and the first control module 105, the second control module 112, the third control module 108, and the fourth control module 114 are connected to the main control module 110.
As shown in fig. 10, the initialization method includes:
step S301. The main control module initializes itself, the booster circuit and the load recognition circuit.
Step S302, when the initialization is completed, the main control module respectively controls the second control module and the fourth control module to enable the second semiconductor switch and the fourth semiconductor switch to be conducted for a first preset time, so that fault detection is conducted on a loop formed by the battery, the load identification circuit and the load.
Step S303, when the fault detection passes, the main control module respectively controls the second control module and the fourth control module to enable the second semiconductor switch and the fourth semiconductor switch to be conducted for a second preset time so as to detect the type and the current direction of the load.
Step S304, the main control module controls the first control module and the third control module to output control signals corresponding to the load type according to the load type and the current direction, so that the boost circuit is conducted to adjust the voltage difference between the battery and the load to a preset voltage range.
The third embodiment is different from the first embodiment in that: the two ends of the resistor on the booster circuit are provided with the first semiconductor switch and the third semiconductor switch, the load identification circuit is provided with the second semiconductor switch and the fourth semiconductor switch, unidirectional conduction devices in the first semiconductor switch and the third semiconductor switch are arranged oppositely, unidirectional conduction devices in the second semiconductor switch and the fourth semiconductor switch are arranged oppositely, the switching-on of the first semiconductor switch or the third semiconductor switch can be controlled only, the switching-on of the booster circuit can be realized, and the switching-on of the second semiconductor switch or the fourth semiconductor switch can be controlled only, and the switching-on of the load identification circuit can be realized.
In one embodiment, the first semiconductor switch and the third semiconductor switch are field effect transistors, the source of the first semiconductor switch is connected to the first end of the resistor, the source of the third semiconductor switch is connected to the second end of the resistor, or the drain of the first semiconductor switch is connected to the first end of the resistor, and the drain of the third semiconductor switch is connected to the second end of the resistor. The second semiconductor switch and the fourth semiconductor switch are field effect transistors, and a source electrode of the second semiconductor switch is connected with a source electrode of the fourth semiconductor switch, or a drain electrode of the second semiconductor switch is connected with a drain electrode of the fourth semiconductor switch.
In another embodiment, the first semiconductor switch, the second semiconductor switch, the third semiconductor switch, and the fourth semiconductor switch may be IGBTs, and the connection manner is the same as that of the field effect transistor, and will not be described herein.
In one embodiment, when the current direction is the first direction, the main control module controls the first control module or the third control module to output a control signal corresponding to the load type according to the load type and the current direction, and the method includes:
the main control module controls the first control module to output a control signal corresponding to the load type.
In another embodiment, when the current direction is the second direction, the main control module controls the first control module or the third control module to output a control signal corresponding to the load type according to the load type and the current direction, including:
the main control module outputs a control signal corresponding to the load type to the third control module.
When the current direction is detected, a PWM control signal is output to a semiconductor switch with the current direction opposite to the conduction direction of the diode in the first semiconductor switch and the third semiconductor switch, and a control signal is not output to the other semiconductor switch, so that the current passes through the diode in the semiconductor switch.
In this embodiment, symmetrical semiconductor switches are disposed on two sides of a resistor of the boost circuit, and symmetrical semiconductor switches are disposed in the load identification circuit, so that the battery and the resistor can be connected in any direction, namely, the first semiconductor switch and the second semiconductor switch are connected with the battery, the third semiconductor switch and the fourth semiconductor switch are connected with the load, the precharge function can be realized, the first semiconductor switch and the second semiconductor switch are connected with the load, the third semiconductor switch and the fourth semiconductor switch are connected with the battery, the precharge function can be realized, the identification direction is not required to be connected, and the operation by a user is facilitated.
As an embodiment, the main control module may control the first control module to output a control signal corresponding to a load type according to the load type, including:
when the load type is a resistor, the first control module is controlled to output a first PWM control signal to the first semiconductor switch, and the third control module is controlled to output a first PWM control signal to the third semiconductor switch;
when the load type is inductance, the first control module is controlled to output a second PWM control signal to the first semiconductor switch, and the third control module is controlled to output a second PWM control signal to the third semiconductor switch;
when the load type is a capacitor, the first control module is controlled to output a third PWM control signal to the first semiconductor switch, and the third control module is controlled to output the third PWM control signal to the third semiconductor switch;
the duty ratio of the second PWM control signal, the duty ratio of the first PWM control signal, and the duty ratio of the third PWM control signal are sequentially increased.
The duty ratio of the second PWM control signal is lower, and the second PWM control signal is suitable for an inductive load. The duty cycle of the first PWM control signal is slightly higher than that of the second PWM signal, and the first PWM control signal is suitable for a resistance load. The third PWM control signal has the highest duty cycle and is suitable for capacitive loads. The corresponding relation can be measured according to a specific experimental mode, and the switch module can be ensured not to be adhered.
As another embodiment, the main control module may control the first control module to output a control signal corresponding to a load type according to the load type, including:
when the load type is detected to be a capacitor, the first control module is controlled to output a PWM control signal with a first duty ratio to the first semiconductor switch, and the third control module is controlled to output the first PWM control signal to the third semiconductor switch, wherein the first duty ratio is more than 0 and less than 1;
when the load type is detected to be other loads, the first control module is controlled to output a PWM control signal with the duty ratio of 1 to the first semiconductor switch, and the third control module is controlled to output a PWM control signal with the duty ratio of 1 to the third semiconductor switch.
The embodiment has an intelligent load type detection function, can automatically adjust a control signal according to the connected load type, divides the load into a capacitor and a non-capacitor load for simplifying a control strategy, and can control the discharging speed of a battery to the capacitor by adjusting the duty ratio of a PWM signal for the capacitor load so as to meet specific requirements. For other loads, full voltage output can be provided to speed up the discharge speed to meet the load demands that do not require PWM control. The implementation mode can be used in different types of applications to meet the requirements of different loads, and the flexibility and applicability of the circuit are improved.
The technical effects of the present embodiment are as follows: different types of loads need different control strategies, and by outputting different PWM control signals, the system can realize more accurate control according to the load types. The duty ratio of the PWM signal is adjusted according to the load type, so that energy can be utilized to the greatest extent, the energy efficiency of the system is improved, the system automatically adjusts the control signal according to the load type, manual intervention is not needed, the system is suitable for different working scenes, the corresponding control signal is adopted to control the semiconductor switch to boost the load, an arc does not occur in the process, and the problem of contact adhesion is avoided.
The following describes embodiments of the present invention in detail by means of specific circuit structures:
as shown in fig. 11 and 12, the intelligent contactor includes a battery 101, a load 102, an MCU, a boost circuit and a load identification circuit, wherein the switch circuit is provided with a contactor K, the boost circuit includes a first semiconductor switch 103, a resistor R, a first control module 105, a third semiconductor switch 107 and a third control module 108, the first semiconductor switch 103, the resistor R and the third semiconductor switch 107 are connected in series and then connected in parallel to two ends of the contactor K, the first control module 105 is connected with the first semiconductor switch 103, a regulator D1 and an optocoupler Q1, the third control module 108 is connected with the third semiconductor switch 107, the regulator D3 and the optocoupler Q3, the load identification circuit includes a second semiconductor switch 111, a second control module 112, a fourth semiconductor switch 113 and a fourth control module 114, the second semiconductor switch 111 and the fourth semiconductor switch 113 are connected in series and then in parallel to two ends of the contactor K, the second control module 112 is connected with the second semiconductor switch 111, the regulator D2 and the optocoupler Q2, and the fourth control module 114 is connected with the fourth semiconductor switch 113, the fourth control module 4 and the fourth control module Q4 and the fourth control module 114.
The initialization method of the intelligent contactor provided by the invention can effectively prevent the high-voltage system from being electrified under the condition of abnormal load. The initialization method is as follows:
the MCU self-checks the integrity of the corresponding user firmware, the integrity passes through checksum detection, double backup is adopted for the user firmware, the MCU detects the legality and the integrity of the configuration parameters, and if the configuration parameters have abnormal values or are incomplete, the configuration parameters need to be recovered from the backup area.
The MCU updates the information of the corresponding module according to the configuration parameters, detects whether all the functional units are in a normal working state according to the configuration parameters, if not, gives an alarm, starts safety protection and does not allow the contactor to be closed. Detecting whether the working voltage and the working temperature of the first control module, the second control module, the third control module and the fourth control module are normal, if not, giving an alarm, starting safety protection and not allowing the contactor to be closed. And controlling the first semiconductor switch and the third semiconductor switch to be quickly conducted, judging whether the current is in a preset range through TMR (total mixed ratio) detection, if so, judging that the module in the booster circuit is normal, otherwise, judging that the module is abnormal, controlling the second semiconductor switch and the fourth semiconductor switch to be quickly conducted, and judging that the module in the load identification circuit is normal if not, if so, judging that the module is abnormal. Detecting whether an externally output signal is legal and valid, if not, giving an alarm, starting safety protection, and not allowing the contactor to be closed.
The MCU controls the second control module and the fourth control module to generate PWM wave type voltage in extremely short time through the control signal 2 and the control signal 4 so as to enable the second semiconductor switch and the fourth semiconductor switch to be conducted, meanwhile, the MCU obtains a current signal through TMR, detects whether loads and lines in a loop connected with the second semiconductor switch and the fourth semiconductor switch are abnormal or not according to the characteristics of peak value, frequency and the like of the current signal, if the loads or the lines in the loop are abnormal, corresponding alarm information is generated, safety protection is started, contactor closing is refused, and if the loads or the lines in the loop are abnormal, subsequent operation is continuously executed.
The MCU controls the second control module and the fourth control module to generate a voltage signal of a pulse waveform in extremely short time through the control signal 2 and the control signal 4, meanwhile, the MCU obtains a current signal through TMR, and the current signal is compared with the square wave signal to obtain a load type and a current direction, and the pre-charging method is judged according to different load types. If the load type cannot be obtained according to the existing data in the judging process, a plurality of pulse signals with different time can be sent for repeated judgment.
The MCU generates voltages with different duty ratios of PWM waveforms through the control signal 1 and the control signal 2 according to different load types to boost the load so as to adjust the voltage difference between the battery and the load to be less than 10%.
According to the embodiment, through initializing and detecting the devices of the circuit and detecting whether the load is abnormal, if the load or the circuit is detected to be abnormal, the power-on is not performed, the safety accidents caused by spark arcing and the like due to the fact that a great amount of heat is generated by load short circuit and the circuit is prevented from being in poor contact are prevented, the corresponding control signals are adopted to control the semiconductor switch to boost the load, the electric arc cannot occur in the process, the problem of contact adhesion is avoided, the system function is comprehensively detected before the formal work of the contactor system, the direction of connection between the battery and the load is judged, the preparation is made for the later pre-charging, the normal operation of the follow-up work can be ensured, the work is refused if the abnormal condition occurs, and the further damage to the power supply system is avoided.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (11)
1. The initialization method of the intelligent contactor is characterized in that the intelligent contactor is arranged between the load and the battery, and comprises a main control module, a contactor, a booster circuit and a load identification circuit, wherein the booster circuit and the load identification circuit are arranged in parallel with the contactor; the boost circuit comprises a first semiconductor switch, a resistor and a first control module, wherein the first semiconductor switch and the resistor are connected in series, and the first control module is connected with the first semiconductor switch; the load identification circuit comprises a second semiconductor switch and a second control module, the second control module is connected with the second semiconductor switch, and the main control module is connected with the first control module, the second control module and the contactor;
the initialization method comprises the following steps:
the main control module initializes itself, the booster circuit and the load identification circuit;
when the initialization is completed, the main control module controls the second control module to enable the second semiconductor switch to be conducted for a first preset time so as to perform fault detection on a loop formed by the battery, the load identification circuit and the load;
When the fault detection passes, the main control module controls the second control module to enable the second semiconductor switch to be conducted for a second preset time so as to detect the type of the load;
the main control module controls the first control module to output a control signal corresponding to the load type according to the load type, so that the boost circuit is conducted to adjust the pressure difference between the battery and the load to a preset voltage range.
2. The initialization method of claim 1, wherein the main control module initializes itself, comprising:
the main control module performs integrity check on the user firmware and the configuration parameters;
when the user firmware and the configuration parameters meet the integrity check, determining that initialization is completed;
and when the user firmware and the configuration parameters do not meet the integrity check, carrying out data recovery on the user firmware and the configuration parameters from a backup area, and judging that the initialization is finished.
3. The initialization method of claim 1, wherein the main control module performs an initialization test for the boost circuit and the load identification circuit, comprising:
The main control module acquires configuration parameters, working state parameters and received external signals of each module in the booster circuit and the load identification circuit;
when the configuration parameters, the working state parameters and the received external signals all meet preset conditions, the step-up circuit and the load identification circuit are judged to finish initialization;
when one of the configuration parameter, the operating state parameter and the received external signal does not meet a preset condition, it is determined that the switching circuit, the booster circuit and the load identification circuit do not complete initialization.
4. The initialization method of claim 1, wherein the main control module controlling the second control module to turn on the second semiconductor switch for a first preset time to perform fault detection on a loop formed by the battery, the load identification circuit and the load, comprising:
the main control module controls the second control module to output a PWM control signal to the second semiconductor switch in a first preset time;
the main control module acquires a current signal output by the battery, compares a parameter value of the current signal with a reference value, and judges a fault state of a loop formed by the battery, the load identification circuit and the load according to a comparison result.
5. The initialization method of claim 4, wherein comparing the parameter value of the current signal with a reference value and determining a fault state of a loop formed by the battery, the load identification circuit, and the load based on the comparison result comprises:
comparing the amplitude of the current signal with a preset reference amplitude range, and comparing the frequency value of the current signal with a preset reference frequency range;
when the amplitude of the current signal is in a preset reference amplitude range and the frequency value of the current signal is in a preset reference frequency range, determining that a loop formed by the battery, the load identification circuit and the load is in a normal state;
and when the amplitude of the current signal is not in a preset reference amplitude range and/or the frequency value of the current signal is not in a preset reference frequency range, determining that a loop formed by the battery, the load identification circuit and the load is in a fault state.
6. The initialization method of claim 1, wherein the main control module controlling the second control module to turn on the second semiconductor switch for a second preset time to detect the type of the load, comprising:
The main control module controls the second control module to output a square wave control signal to the second semiconductor switch in a second preset time;
and the main control module acquires a current signal output by the battery and acquires a load type according to the current signal.
7. The initialization method of claim 6, wherein said obtaining a load type from said current signal comprises:
comparing the current signal with a square wave signal;
when the current signal is consistent with the square wave signal, the load is judged to be a resistor;
when the current signal is a sawtooth wave signal transformed along the rising edge waveform of the square wave, the load is judged to be an inductance;
and when the current signal is a spike wave signal gradually decaying along the rising edge of the square wave, judging that the load is a capacitor.
8. The initialization method of claim 7, wherein the main control module controlling the first control module to output a control signal corresponding to the load type according to the load type, comprising:
when the load type is a resistor, controlling the first control module to output a first PWM control signal to the resistor;
When the load type is an inductor, controlling the first control module to output a second PWM control signal to the inductor;
when the load type is a capacitor, controlling the first control module to output a third PWM control signal to the capacitor;
the duty ratio of the second PWM control signal, the duty ratio of the first PWM control signal, and the duty ratio of the third PWM control signal are sequentially increased.
9. The initialization method of claim 7, wherein the main control module controlling the first control module to output a control signal corresponding to the load type according to the load type, comprising:
when the load type is a capacitor, the main control module controls the first control module to output a PWM control signal with a first duty cycle to the first semiconductor switch, wherein the first duty cycle is greater than 0 and less than 1;
when the load type is other loads, the main control module controls the first control module to output a PWM control signal with a duty ratio of 1 to the first semiconductor switch.
10. The initialization method of the intelligent contactor is characterized in that the intelligent contactor is arranged between the load and the battery, and comprises a main control module, a contactor, a booster circuit and a load identification circuit, wherein the booster circuit and the load identification circuit are arranged in parallel with the contactor; the boost circuit comprises a first semiconductor switch, a resistor, a first control module, a third semiconductor switch and a third control module, wherein the first semiconductor switch, the resistor and the third semiconductor switch are connected in series, the first control module is connected with the first semiconductor switch, the third control module is connected with the third semiconductor switch, the load identification circuit comprises a second semiconductor switch, a second control module, a fourth semiconductor switch and a fourth control module, the second semiconductor switch and the fourth semiconductor switch are connected in series, the second control module is connected with the second semiconductor switch, the fourth control module is connected with the fourth semiconductor switch, and the main control module is connected with the first control module, the second control module, the third control module, the fourth control module and the contactor;
The initialization method comprises the following steps:
the main control module initializes itself, the booster circuit and the load identification circuit;
when the initialization is completed, the main control module respectively controls the second control module and the fourth control module to enable the second semiconductor switch and the fourth semiconductor switch to be conducted for a first preset time so as to perform fault detection on a loop formed by the battery, the load identification circuit and the load;
when the fault detection passes, the main control module respectively controls the second control module and the fourth control module to enable the second semiconductor switch and the fourth semiconductor switch to be conducted for a second preset time so as to detect the type and the current direction of the load;
the main control module controls the first control module or the third control module to output a control signal corresponding to the load type according to the load type and the current direction, so that the boost circuit is conducted to adjust the pressure difference between the battery and the load to a preset voltage range.
11. The initialization method of claim 10, wherein when the current direction is a first direction, the main control module controls the first control module or the third control module to output a control signal corresponding to the load type according to the load type and the current direction, comprising:
The main control module controls the first control module to output a control signal corresponding to the load type;
when the current direction is the second direction, the main control module controls the first control module or the third control module to output a control signal corresponding to the load type according to the load type and the current direction, and the method comprises the following steps:
the main control module outputs a control signal corresponding to the load type to the third control module.
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| CN117416210A (en) * | 2023-12-19 | 2024-01-19 | 深圳市长天智能有限公司 | Contactor fault early warning method, contactor controller, load circuit and automobile |
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|---|---|---|---|---|
| CN117416210A (en) * | 2023-12-19 | 2024-01-19 | 深圳市长天智能有限公司 | Contactor fault early warning method, contactor controller, load circuit and automobile |
| CN117416210B (en) * | 2023-12-19 | 2024-03-29 | 深圳市长天智能有限公司 | Contactor fault early warning method, contactor controller, load circuit and automobile |
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| CN117134303B (en) | 2024-02-27 |
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