Refrigeration appliance main control board with compressor protection and start control functions

Abstract

The invention discloses a refrigeration appliance main control board with compressor protection and start control functions. One path of mains supply supplies direct current to a panel button and display interface module, a temperature sensor signal processing module and a control and logic processing module through a switching power supply module respectively; Another path of the mains supply can switch on and switch off a power supply main winding through a compressor power supply control module, a compressor starting control module is connected to a power supply starting winding of the compressor power supply control module, and the common end of the two windings is connected with a zero line; and the temperature sensor signal processing module outputs a voltage signal to be processed by the control and logic processing module, the control and logic processing module is in two-way communication with the panel button and display interface module, and the control and logic processing module is respectively in signal connection with the compressor power supply control module and the compressor starting control module. According to the invention, operation power supply control and starting power supply control are integrated on one mainboard, so that electronic contactless power supply on-off control is realized, arc discharge heating of a thermal protector and a PTC starter is eliminated, and starting, operation and protection monitoring of the compressor are ensured.

Description

【Technical field】 [0001] The invention relates to a main control board of a refrigeration appliance, in particular to a main control board of a refrigeration appliance with compressor protection and start-up control functions. 【Background technique】 [0002] The two devices commonly connected in series in the compressor power supply circuit are PTC starter and bimetal thermal protector. The bimetal thermal protector belongs to the contact type switch, and its working principle is as follows: when the electrical appliance is working normally, the bimetal contact is in a closed contact state; when the temperature rises to its action temperature value, the bimetal element is heated and generates The internal stress causes rapid flipping and deformation action, and opens the contact to cut off the circuit, thus playing the role of thermal protection; when the temperature drops to the reset temperature, the contact automatically closes and contacts, and returns to normal working ...

AI Technical Summary

Problems solved by technology

[0004] 1. The chip of the PTC starter is impacted by a long time of high current (starting current), and occasionally the chip is broken, resulting in internal arcing, heating, and even fire;

[0005] 2. The bimetal thermal protector has an arcing phenomenon at the moment of tripping off and resetting, and the arcing causes heating. In extreme cases, the temperature rise and local air ionization caused by the intermittent arcing at the contacts will cause the thermal protector to The casing catches fire instantly and causes a fire;

[0006] 3. After long-term operation of the bimetal thermal protector, its preset parameters will drift, resulting in untimely protection or response or even failure.

In case of abnormal temperature rise of the compressor (such as motor winding turn-to-turn / phase-to-phase insulation failure, enameled wire enameled film insulation failure or system operating pressure change, working condition change or abnormal start-up, etc.), due to the lag in temperature measurement of the protector, it is not timely. Cut off the power supply of the circuit so that there is no effective protection for the overheating and overcurrent of the compressor, which will inevitably burn the compressor

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