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External rotor electronically controlled fan overvoltage protection speed regulation circuit and overvoltage protection method

An electronic control and overvoltage protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve the effect of avoiding damage

Active Publication Date: 2015-12-09
HANGZHOU DUNLI ELECTRIC APPLIANCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages: it is not suitable for the DC brushless external rotor fan with AC power input in this application

Method used

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  • External rotor electronically controlled fan overvoltage protection speed regulation circuit and overvoltage protection method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: with reference to attached figure 1 . An overvoltage protection speed regulation circuit of an external rotor electronically controlled fan, including an AC-direct power conversion circuit, an isolation characteristic speed regulation circuit, an overvoltage protection circuit and an intelligent power control module, and an AC / DC conversion chip in the AC-direct power conversion circuit The 0 input terminal is connected to the direct current after AC-DC conversion and capacitor filtering, the AC / DC conversion chip 0 output terminal is connected, the input terminal of the isolated power supply in the speed regulation circuit with isolation characteristics, and the power supply of the isolated power supply in the speed regulation circuit with isolation characteristics The output terminal outputs +10V power supply, the ground terminal GND2 of the isolated power supply is connected to the ground terminal of the operational amplifier chip Ⅰ, the ground terminal...

Embodiment 2

[0010] Embodiment 2: On the basis of Embodiment 1, an overvoltage detection and protection method for the speed regulation circuit of an outer rotor fan uses a voltage detection circuit to detect the VS voltage at the intelligent power control module terminal in real time. When the VS voltage at the intelligent power control module terminal rises When the voltage is high, the voltage at point A of the signal input terminal of the comparator chip III also rises accordingly. After the switch-on voltage of the device chip III, the voltage of the RES terminal of the DC brushless fan logic driver chip becomes low level, and the DC brushless fan logic driver chip immediately turns off the driving signal required by the power module, and the fan uses its own winding to consume U1 , so that it is reduced until it is the same as the DC voltage after DC, and the overvoltage protection circuit is realized.

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Abstract

The invention relates to an over-voltage protection speed regulation circuit and an over-voltage protection method for an outer rotor electronic controlled draught fan. The over-voltage protection speed regulation circuit and the over-voltage protection method for the outer rotor electronic controlled draught fan comprise an alternating-direct current power supply changeover circuit, an isolation characterized speed regulation circuit, an over-voltage protection circuit and a smart power control module. The over-voltage protection circuit is composed of resistors R1, R2, R3, a comparator chip III and a direct-current brushless draught fan logic drive chip. One end of the R1 and one end of the R2 are connected with a signal input end of the comparator chip III in a parallel mode, the other end of the R1 is connected with a virtual storage (Vs), the other end of the R2 is connected with the ground, a signal output end of the comparator chip III is connected with a fixed resistance (Res) end of the direct-current brushless draught fan logic drive chip and one end of the R3, the other end of the R3 is connected with a voltage regulator (Vreg) end of the direct-current brushless draught fan logic drive chip, an rotating speed control port of the direct-current brushless draught fan logic drive chip is connected with a signal input end of an optical coupler I of the isolation characterized speed regulation circuit, and a signal output end of the direct-current brushless draught fan logic drive chip is connected with signal input ends of the smart power control module and a direct-current brushless draught fan.

Description

technical field [0001] The invention relates to an overvoltage protection speed regulation circuit and an overvoltage protection method of an outer rotor electronically controlled fan that can avoid the reverse voltage generated by the back electromotive force of the fan itself from damaging the intelligent power control module, and belongs to the outer rotor fan regulator. The field of high-speed circuit manufacturing. Background technique [0002] CN102312847A, the name is "an integrated centrifugal fan without position sensor drive", the undervoltage and overvoltage detection circuit adopts the method of large resistance isolation, and the bus voltage is converted into the simulation of the input of the control chip through a simple operational amplifier circuit signal to realize under-voltage and over-voltage detection. The input of this operational amplifier is the bus voltage, the input resistance is large, and the feedback resistance is small, so that the actual input...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/08
Inventor 孙勇屈刚
Owner HANGZHOU DUNLI ELECTRIC APPLIANCES