Realization method for high interference immunity power supply
An implementation method and power supply technology, applied in the field of power supply, can solve the problems of non-recoverable devices, difficulty in collecting and observing electric field and magnetic field distribution, and no solutions, so as to achieve the effect of weakening interference
Inactive Publication Date: 2012-11-21
XIAN HUAWEI AUTOMATIC CONTROL EQUIP
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Problems solved by technology
This potential interferes with the power supply and the acquisition circuit in the form of common-mode and differential-mode interference, causing instantaneous errors and chaos in the equipment, and in severe cases, irreversible damage to the device
Existing power supplies on the market can only achieve anti-disturbance during stable periods
However, due to the instantaneous nature of instantaneous interference, it is difficult to collect and observe the instantaneous electric field and magnetic field distribution, and there are no corresponding specific solutions in the existing technical solutions
Method used
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[0051] Select 50KHz as the variable-frequency AC wave output, and use two transformers for isolated transmission. During the winding process of the transformer, the distance between any position of the input coil, iron core, and output coil is required to be greater than 2mm. The input and output ends of each transformer reach 12KV withstand voltage. In the design of the post-stage filter, a non-inductive capacitor with a nominal value of 8nF and a non-capacitive inductance of 30uF is used to suppress the passage of high-frequency interference above 100KHz.
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A realization method for a high interference immunity power supply comprises the following steps: 1), frequency conversion, the specific way is that an LC low pass filter, a DC rectifier converter and an AC generator are sequentially encapsulated in a shielding box which is not grounded, but connected with a circuit; an AC or DC input power supply of 85-265 V is converted into high-frequency AC wave higher than 50 kHz to serve as a transmission energy source; and a sawtooth wave signal generated by the AC generator is changed into an AC signal through shaping, and then the AC signal is output through a push-pull circuit driver transformer; 2), isolation, the specific way is that the high-frequency AC wave higher than 50 kHz obtained in step 1) is subjected to isolation transformation and power transmission through an isolation transformer; the isolation transformer is encapsulated through pouring glue after being manufactured, and whereas the discrete coupling capacitance value between the input and output of the transformer is not larger than 10 pF, the withstand voltage is not lower than 20 kV; and 3), voltage stabilization, the specific way is that the high-frequency AC wave obtained in the step 2), which is isolated by the transformer, is subjected to voltage stabilization to output as a DC power supply of 12 V. The method has the characteristic of high interference immunity.
Description
technical field [0001] The invention belongs to the technical field of power supplies, and relates to a high anti-interference power supply for shielding electromagnetic field interference and powering photoelectric transformer testing equipment and other on-line monitoring equipment, in particular to a method for realizing a high anti-interference power supply. Background technique [0002] With the development of a strong smart grid by the State Grid, higher requirements are put forward for various performance indicators of monitoring equipment. Therefore, intelligent equipment with reliable application performance, high sensitivity, high precision, and high stability has naturally become the general trend. However, the development of photoelectric transformers is not satisfactory at present. Transformer accidents, data monitoring is not in place, and monitoring data loss occurs frequently. Everyone has doubts about the reliability of the photoelectric transformer. The de...
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IPC IPC(8): H02M1/44
Inventor 卢江平张根盈张安社冯华军秦江斌王永军
Owner XIAN HUAWEI AUTOMATIC CONTROL EQUIP