1. Prohibit the use of products in humid, dust, corrosive gas ring;

2, before the product power work, should ensure that microwave variable frequency switch grounding wire reliable grounding;

3, bare board microwave frequency switch output high voltage slot should be increased more than 1mm thick 8mm high surface. Out of the plug-in insulation board increase the high output part of creepage distance;

4, prohibit touching products at work.

1. The inductance of the magnetron filament used in the linear transformer is much higher than that of the magnetic tube used for the frequency conversion switching power supply;

2. The working frequency of the switching power supply is much higher than that of the linear transformer. The higher inductance impedance of the magnetron filament leads to the decrease of the filament current;

3, too low filament current will lead to the filament heating time is too long, the boot time is too long, too high filament impedance will produce excessive power loss, filament overheating;

4, it is recommended to use the magnetron for frequency conversion switching power supply to meet the high frequency operation characteristics of the power supply.

PFC (Power Factor Correction) power factor correction is mainly to improve the power supply AC input effective power and apparent power ratio. Generally do not contain PFC line models, the input power factor is only 0.4-0.6, and active PFC lines can be reached above 0.9, the correlation is as follows: apparent power x = input voltage input current (VA) power x = input voltage input current x power factor (W);

From the viewpoint of environmental protection, the power plant of electric power company must produce more than the apparent power, its generator can be stabilized to supply the market power demand, and the actual use of power is the effective power. If the power factor is 0.5, which means that the generator sets out more than 2VA power, the power supply 1W can be safely supplied, and its energy operation efficiency is poor. On the other hand, if the power factor is improved to 0.95, then the power generation unit of the electric power company will issue no more than 1.06VA power supply, and the power supply 1W will be better. The operation efficiency of the power supply is better.

The switching power supply power supply in the input power of the moment there will be a brief (1/2-1 power cycle, EX:60Hz power supply of high current (1/120-1/60 seconds) in the product design is about 20-100A, please refer to the product specifications, product) boot after the return to normal current input, each input in the power transmission moment will appear and this is a normal phenomenon, and will not damage the power supply. But it is not recommended to continue power supply on / off. The other should pay attention to, if the use of multiple power supply at the same time boot, may cause the system power distribution protection switch tripping action, suggest multiple power supply should be spaced one by one open, or the power supply function of remote control products on / off.

1. pulse width modulation (PWM); pulse waveform with fixed duty cycle and variable frequency;

2. pulse frequency modulation (PFM), pulse duty waveform with variable frequency duty cycle;

The vibration displacement values of three directions of X, Y and Z are detected, and the data output mode of UART is adopted.

1, 3D level vibration displacement sensor installed in the washing machine tub, installation angle is smaller than 15 deg;

2. Using the 3D vibration displacement sensor, the washing machine computer controller can transfer the speed signal data of the inner barrel to the sensor.

1. The output voltage V<8VDC and output current I<0.8A of the electrolytic water module enter the protection mode;
2, the electrolytic tank inside the anhydrous, clean water, small working current, causing the electrolytic water module into the protection mode;
3, short circuit caused by water electrolysis cell module into protection mode;