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Automatic following control circuit for fan

An automatic tracking and control circuit technology, applied in the direction of pump control, machine/engine, mechanical equipment, etc., can solve the problem of difficult wind pressure protection for strong drum gas water heaters

Inactive Publication Date: 2013-01-16
GUANGDONG HUAMEI JUNDA ELECTRIC APPLIANCES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the wind pressure protection of the strong drum type gas water heater has become a technical problem

Method used

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  • Automatic following control circuit for fan
  • Automatic following control circuit for fan

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Embodiment Construction

[0011] like figure 1 and figure 2 As shown, the present invention provides a fan automatic tracking control circuit, which is mainly suitable for the strong drum type gas water heater 10, and utilizes the mechanism that the flow rate of the strong blower 3 is proportional to the speed; the wind pressure is proportional to the square of the speed. The basic circuit is composed of single-chip microcomputer and PWM drive circuit, and the current feedback circuit is used to stabilize the working state of the fan and automatically track the change of wind pressure.

[0012] Please refer to figure 1 shown. It is the structural diagram of the strong drum type gas water heater. Among them, it can be seen that when the strong drum type gas water heater 10 is working, the gas is burned in a sealed burner 2 isolated from the outside world, and the air required for gas combustion is completely supplied by the strong blower 3, and the air volume is strictly proportional to the gas ...

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Abstract

The invention provides an automatic following control circuit for a fan, which comprises a level conversion circuit of a controller, a triangular wave generation circuit, an amplifier U1A for generating triangular waves, a pulse width modulation circuit and a singlechip microcomputer to send control signals in form of pulse width modulation. The control signals are transmitted by a smooth circuit consisting of resistors R7 and R9 and a capacitor C3 to a pin 5 of an amplifier U2B to enable a pin 7 of the U2B to generate corresponding control level which is transmitted to a pin 5 of the UIB, and to enable the pin 7 of the UIB to generate corresponding pulse width modulation square waves and triangular waves generated by the U1A. The rotating speed signals of the fan after power amplification and filtration are output to a direct current air supply fan. The purpose of controlling the combusting work condition of a water heater and protecting air pressure is realized by following the rotating speed of the fan.

Description

technical field [0001] The invention relates to a control circuit, in particular to a fan automatic tracking control circuit of a strong drum type gas water heater. Background technique [0002] The technology of the strong drum type gas water heater is developing rapidly, and it is constantly developing in the direction of high load and large liters. The combustion feature of the strong drum gas water heater is that the air volume (that is, the air volume) changes in proportion to the gas volume to ensure that the combustion conditions meet the requirements. [0003] In actual use, it is easy to change the ratio of air volume to gas volume due to the wind pressure at the smoke exhaust port, resulting in a sharp deterioration of the combustion conditions and excessive carbon monoxide, which affects personal safety. [0004] In order to ensure the safety of use, at present, the air pressure switch or carbon monoxide probe is generally used to monitor and protect the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
Inventor 彭琼张剑明
Owner GUANGDONG HUAMEI JUNDA ELECTRIC APPLIANCES
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