Refrigerator compressor power-saving improvement methods

Most of the refrigerator use PTC starting circuits. Because this product has been in use for six or seven years, the performance of the components is unstable and easily damaged if the voltage amplitude fluctuates. This will cause the electric frost compressor to have difficulty starting, overload, low torque, surge in current, high power consumption and other faults.

According to the energy storage principle of capacitors, using capacitors to start or putting capacitors into operation during operation can increase the starting torque of the compressor. According to actual measurements, the compressor can operate normally when the power supply voltage is lower than 180V. Using capacitor operation can save power consumption.

The author improved a Xiangxuehai brand refrigerator . Its "rated operating voltage is 220V, operating current is 1.25A, and the power of the compressor is 93W." The power supply principle diagram 1 and the improved circuit diagram 2 are briefly described as follows. For readers' reference.

The circuit after technical modification is to connect an oil-immersed capacitor with a withstand voltage of 400-1000V and a capacity of 1-1.5μF in parallel at both ends of the PTC. During operation. It can increase the rotation torque of the compressor and relatively reduce the load of the compressor.

In addition, a non-polar capacitor with a voltage of 400V and a capacity of 150μF is connected from the starting winding to the PTC starting circuit to enable the compressor to operate normally, reduce power consumption and save electricity.

After the above improvements and verification after using it for a period of time, the effect is good. The actual test results show that the working current of the compressor has been reduced from the original 1.25A to 0. 78-0.815A or so. Not only reduces power consumption. It saves energy, reduces heat, increases the power of the compressor, and extends the service life of the compressor. Interested readers may wish to make technical modifications to some refrigerator compressors that have been used for many years. I believe they will benefit a lot.

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