An energy-saving control circuit for a ventilation fan

Abstract

The invention discloses an energy saving type control circuit for a ventilation fan. The energy saving type control circuit mainly consists of a diode rectifier U, an amplifier P, a field effect transistor MOS, a unidirectional thyristor VS, a thermistor RT, a switch SW, a triode VT1, a triode VT2, a resistor R9, a polar capacitor C5 and a resistor R12, wherein one end of the resistor R12 is connected with an anode of the unidirectional thyristor VS, and the other end of the unidirectional thyristor VS is grounded. According to the energy saving type control circuit, the thermistor RT is a macromolecular ptc thermistor, the macromolecular ptc thermistor has a property of automatically restoring a fuse, and the current of the thermistor RT can be regulated and combined with peripheral current; and intermittent power supply can be well realized on the ventilation fan, so that the problem that a motor of the ventilation fan is at a high temperature for a long term is effectively solved, the service life of the ventilation fan is well prolonged, and electric resources are greatly saved.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an energy-saving control circuit for a ventilation fan. Background technique [0002] The number of deaths due to carbon monoxide poisoning is increasing every year around the world, and poor air circulation is an important factor leading to carbon monoxide poisoning. In order to prevent the occurrence of carbon monoxide poisoning due to lack of air circulation, people have installed ventilation fans in places with small spaces such as toilets, corridors, and kitchens to ensure that the air in the room and the outside world circulate and reduce the carbon monoxide gas in the room. However, at present, people often use a continuous power supply control circuit as the control circuit of the ventilation fan. This continuous power supply control circuit will always supply power to the ventilation fan after it is turned on, so that the ventilation fan will continue to work, causing the moto...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the ventilating fan in the prior art uses a continuous power supply type control circuit to supply power to the ventilating fan continuously and uninterruptedly, so that the ventilating fan does not stop working, causing the motor of the ventilating fan to be in a high temperature state for a long time , providing an energy-saving control circuit for ventilating fans that intermittently supplies power to the ventilating fan, thereby solving the problem that the motor of the ventilating fan is at high temperature for a long time

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