Frequency conversion draught fan low-speed operation fault detection and alarm circuit
An alarm circuit and low-speed operation technology, applied in the direction of measuring electricity, motor generator testing, measuring devices, etc., can solve the problems of fans that are difficult to detect fan current change signals, fan overload or phase failure loss, etc., to achieve low cost and reduce damage, job stability effects
Inactive Publication Date: 2018-03-13
安徽云智浦科技有限公司
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Problems solved by technology
[0002] Ordinary AC fans are widely used due to their low cost, but only external frequency converters can be used to adjust the speed of the fans, which is also the best choice in terms of cost. The interference from the radiation of the fan makes it difficult to detect the fan current change signal when the fan is at a very small frequency (the fan is very small), and the fan overload or phase failure will bring unpredictable losses to the site
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[0021] see figure 1 , a frequency conversion fan low-speed operation fault detection and alarm circuit, including a frequency converter, fan, MCU, signal acquisition circuit, rectification circuit, signal processing amplifier circuit, shaping gating circuit, signal isolation circuit and alarm signal output circuit, signal acquisition circuit The input end of the signal processing amplifier circuit is connected to the input end of the signal processing amplifier circuit, and the output end of the signal processing amplifier circuit is connected to the input end of the shaping gate circuit. , the output end of the shaping gating circuit is connected with the input end of the signal isolation circuit, the output end of the signal isolation circuit is connected with the input end of the alarm signal output circuit, the output end of the alarm signal output circuit is connected with the alarm circuit, or connected with the MCU connected to the signal input.
[0022] The signal acq...
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A frequency conversion draught fan low-speed operation fault detection and alarm circuit disclosed by the present invention comprises a frequency converter, a draught fan, an MCU, a signal acquisitioncircuit, a rectifying circuit, a signal processing and amplifying circuit, a shaping and gating circuit, a signal isolation circuit and an alarm signal output circuit. The input end of the signal acquisition circuit is connected with a connection line between the frequency converter and the draught fan, and the output end is connected with an alarm circuit orderly via the rectifying circuit, thesignal processing and amplifying circuit, a shaping and gating circuit, the signal isolation circuit and the alarm signal output circuit, or is connected with the signal input end of the MCU. The frequency conversion draught fan low-speed operation fault detection and alarm circuit of the present invention is low in cost, is stable to work, can detect a micro current in the working environment ofthe specific equipment, for example the frequency converter, can output a stable square wave signal, and can detect the current and output the signals stably at the frequency as low as 5% of the frequency converter, guarantees that the draught fan can be monitored reliably at the operation state of any speed, and enables the damage of the draught fan faults to the sites to be reduced.
Description
technical field [0001] The invention relates to the technical field of fan fault detection, in particular to a low-speed operation fault detection and alarm circuit for variable frequency fan. Background technique [0002] Ordinary AC fans are widely used due to their low cost, but only external frequency converters can be used to adjust the speed of the fans, which is also the best choice in terms of cost. The interference radiated by the fan makes it difficult to detect the fan current change signal when the fan is at a very small frequency (low speed of the fan), and the overload or phase failure of the fan will bring unpredictable losses to the site. Contents of the invention [0003] The purpose of the present invention is to provide a low-cost, stable working fault detection and alarm circuit for low-speed operation of frequency conversion fans, which can detect and output tiny currents and output stable square wave signals in the specific working environment of freq...
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IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 佘德勇
Owner 安徽云智浦科技有限公司