Power distribution protection method for loads
A technology for power distribution protection and load current, which is applied in protection against overcurrent, emergency protection device for automatic disconnection, emergency protection circuit device, etc. protection and other issues to achieve the effect of improving real-time and reliability
Inactive Publication Date: 2015-01-07
CHINA NORTH VEHICLE RES INST
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Problems solved by technology
[0003] However, the loads of vehicle electrical equipment are diverse and complex, among which capacitive, inductive and filament loads will generate very large current peaks at the moment of power-on; traditional power distribution methods are very easy to cause false protection at the moment of power-on;
[0004] Secondly, due to different working conditions and ambient temperature, the current generated by the same load is also different, especially when the load is subjected to external electromagnetic interference during work, the current on the load will fluctuate greatly. The traditional power distribution method is also extremely easy to cause false protection;
[0005] In addition, the traditional power distribution method only judges whether to protect the load by comparing the collected transient current value with the preset threshold value. This method cannot clearly distinguish the current state of the load, such as load open circuit, overcurrent or short circuit. different judgments, so that different protection treatments cannot be carried out for different states of the load
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[0049] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings.
[0050] The workflow of the power distribution protection method provided by the present invention is as follows: figure 1 Shown:
[0051] S1 first sets the initial values of counting values T1, T2, T3, and T4 as 0, 100, 0, and 10 respectively; sets the current values of thresholds A, B, C, and D as 3, 166, 595, and 880 respectively;
[0052] S2 judges whether the load is in the locked state, if it is in the locked state, judges whether to re-power on, re-power on, and the load is automatically unlocked after power-on;
[0053] S3 samples the current of the load;
[0054] S4 performs AD conversion on the sampled load current;
[0055] S5 takes the average value I of the three current values collected continuously;
[0056] S6 adopts a stepped judgment method for the magnitude of the current ...
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The invention provides a power distribution protection method for loads. The method comprises the following steps that S1, sampling is carried out on load currents according to the conditions of the loads; S2, AD conversion is carried out on the sampled load currents; S3, the mean value of the load currents existing after the AD conversion is calculated is worked out; S4, the loads are protected according to the mean value of the currents. According to the power distribution protection method for the loads, influences of the surge currents generated at the moment of switching on or switching off a certain load or certain loads of a vehicle electric information system on the working state of the load or the loads can be avoided, the real-time performance, the reliability and the safety are improved, and the demand for load control is met.
Description
Technical field: [0001] The invention relates to a power distribution protection method, in particular to a method for carrying out power distribution protection for loads. Background technique: [0002] The load distribution of vehicles is generally realized by electronic switches. When distributing power, the threshold value is set first, and the current of the load is collected at a certain time interval. Each sampling is compared with the preset threshold value. Protect the load. [0003] However, the loads of vehicle electrical equipment are diverse and complex, among which capacitive, inductive and filament loads will generate very large current peaks at the moment of power-on; traditional power distribution methods are very easy to cause false protection at the moment of power-on; [0004] Secondly, due to different working conditions and ambient temperature, the current generated by the same load is also different, especially when the load is subjected to external e...
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IPC IPC(8): H02H3/00H02H3/08
Inventor 庞凤颖倪永亮张玉海黄敏李鑫李欣颜王志刚朱天蔚李玉刚王美靖张一郭倩雅郭黎霞
Owner CHINA NORTH VEHICLE RES INST