Novel voltage stabilizer with smoke sampling protection

Abstract

A novel voltage stabilizer with smoke sampling protection comprises an output protection control circuit and an input protection control circuit. A voltage sampling circuit, a voltage stabilizing control circuit, a motor driving circuit, and a state indication circuit are arranged beside the output protection control circuit. A temperature and current sampling circuit, a smoke sampling circuit, a calculation and processing circuit, and a time delay circuit are arranged beside the input protection control circuit. The output protection control circuit is connected to the input protection control circuit through the time delay circuit. On abnormal conditions, a coil of an autotransformer T1 heats, the insulation of the coil is destroyed, carbon monoxide or hydrogen gas is given off, or smoke is generated, a gas sensor in the smoke sampling circuit collects carbon monoxide or hydrogen gas or smoke and converts carbon monoxide or hydrogen gas or smoke into electric signals, the calculation and processing circuit processes and amplifies the signals, a switch K1 of the input end of the voltage stabilizer is turned off through the input protection control circuit, the coil of the autotransformer T1 cuts off electricity, and then failures can not further expand, so that the purpose of reliable protection is achieved.

Description

technical field [0001] The invention belongs to the technical field of AC voltage stabilizers with a contact structure, and in particular relates to a voltage stabilizer with smoke sampling protection. Background technique [0002] The contact AC voltage stabilizer currently on the market is a closed-loop control system composed of a specially designed voltage regulator or transformer and a controller (or control circuit). It is an electrical device that achieves the purpose of stabilizing the output voltage through automatic adjustment. See figure 1 , usually consists of a contact autotransformer, an automatic control circuit and a servo motor. This type of voltage stabilizer adopts stepless voltage regulation. The product has high output accuracy, small waveform distortion, strong anti-interference ability, high cost performance, and wide market coverage. However, according to years of production and sales, the failure of this type of voltage stabilizer The rate is also h...

AI Technical Summary

Problems solved by technology

Although there are overheat protection, overcurrent protection and overvoltage protection in the design of voltage stabilizer products, since the voltage regulation of this type of voltage regulator is realized by moving the carbon brush on the autotransformer coil, in actual work due to Due to various factors such as the changeable power grid and the unfixed user load, the position of the carbon brush of the voltage stabilizer is changeable, and the heating position of the coil also changes at any time. Due to the unfixed fault point, the actual overheating protection cannot be accurately sampled, and the coil cannot be completely avoided. Burn out; overcurrent protection samples the operating current of the voltage regulator for protection. Since this type of voltage regulator has the characteristic of derating when the input voltage is low, the current value of the same operating current is a normal signal when the voltage is high. , and when the voltage is low, the current may be an abnormal signal, so the overcurrent protection cannot be accurately and reliably protected; the overvoltage protection of the product can protect the safety of the output load, but if the overvoltage occurs due to the grid voltage If the voltage rises or the internal voltage regulating mechanism of the voltage stabilizer is abnormal, the autotransformer inside the voltage stabilizer will enter a state of magnetic saturation, the coil will be damaged, and the voltage stabilizer itself will be damaged. The load at the back end of the voltage regulator cannot protect the voltage regulator itself

[0003] Therefore, the above existing protection measures have their own limitations in the implementation process, and it is difficult to achieve timely and effective protection when the coil is burned. In addition, most voltage stabilizers on the market usually protect the above measures by cutting off the voltage stabilizer. In actual use, because there is still voltage inside the voltage stabilizer, when the coil fails, the accident may still spread further, and it is impossible to completely and effectively avoid safety accidents

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