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A load overcurrent protection method based on self-recovery function
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An overcurrent protection, load overcurrent technology, applied in the direction of automatic disconnection of emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as task interruption, achieve low manufacturing costs, save time and labor, and facilitate The effect of understanding and accepting
Inactive Publication Date: 2016-03-30
CHINA NORTH VEHICLE RES INST
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Abstract
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Problems solved by technology
The characteristics of these overcurrent protection power distribution systems are to implement power-off protection immediately after the load is overcurrent. In this way, in some devices with relatively complicated mechanical structures, the drive motor will be blocked immediately due to a slight blockage of the mechanical structure. Shutdown of the motor load distribution for overcurrent protection, interrupting the task
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Embodiment 1
[0030] The load overcurrent protection method based on the self-recovery function of this embodiment, from figure 1 It can be seen that the resistance of the device driven by the motor varies greatly.
[0031] After the motor is blocked for the first time, the power supply is cut off by over-current and then turned on again. If the motor is still blocked and causes over-current, the power supply of the motor is cut off for over-current protection.
[0032] The motor self-recovery protection current curve is shown as figure 2 As shown, the specific implementation process is as follows image 3 shown;
[0033] Include the following steps:
[0034] 1) Collect load current at fixed time intervals;
[0035] 2) According to the magnitude of the load current, judge whether the rotor is blocked for the first time;
[0036] 3) According to the judgment result of step 2, if a stall occurs, overcurrent protection is performed: stop the power distribution of the motor for 0.5 second...
Embodiment 2
[0040] The load overcurrent protection method based on the self-recovery function of this embodiment, from figure 1 It can be seen that the resistance of the device driven by the motor varies greatly.
[0041] After the motor is blocked for the first time, the power supply is cut off by over-current and then turned on again. If the motor is still blocked and causes over-current, the power supply of the motor is cut off for over-current protection.
[0042] The motor self-recovery protection current curve is shown as figure 2 As shown, the specific implementation process is as follows image 3 shown;
[0043] Include the following steps:
[0044] 1) Collect load current at fixed time intervals;
[0045] 2) According to the magnitude of the load current, judge whether the rotor is blocked for the first time;
[0046] 3) According to the judgment result of step 2, if a stall occurs, overcurrent protection is performed: stop the power distribution of the motor for 1 second a...
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Abstract
The invention relates to a load overflow protection method based on a self-recovery function, wherein the load overflow protection method is characterized by comprising the following steps: 1) collecting load current at intervals according fixed time; 2) determining whether the first time of locked rotor is carried out according to the load current; 3) carrying out overcurrent protection: connecting continuously after power distribution for a motor for 0.5-1 second; 4) determining whether locked rotor is carried out again continuously after connection; and 5) protecting the motor for overcurrent protection when the locked rotor is carried out, and repeating in the mode. The more reasonable control of the load for a complex mechanical device can be realized effectively; and the method is simple, and is convenient for operating personnel to understand and accept.
Description
technical field [0001] The invention relates to the application of an intelligent power electronic switch, in particular to a load overcurrent protection method proposed for a motor load with a complex mechanical structure in a power distribution management system based on an intelligent power electronic switch. Background technique [0002] Some motor loads in the vehicle drive relatively complex mechanical devices. Due to the complexity of the mechanical device or the excessive damping of the mechanical structure, the mechanical device is stuck in the middle of the operation process, resulting in the motor stalling; if the motor stalls for a long time It will cause the motor to be burned, but if at this time, the power supply to the motor is stopped immediately to protect the motor, and the motor is stopped, the task will be interrupted due to the shutdown of the motor, and important work failure will affect the completion of the vehicle task. [0003] The traditional fuse...
Claims
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Application Information
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