First, the difference between high-frequency and power frequency forklift charger working mode Power frequency forklift charger power device works in a linear state, which means that he uses the power device is always working, so it leads to his work efficiency, Generally in 50%~60%, he still has to say that he is a good linear power supply. The linear power supply works in such a way that he has to press the device from high voltage to low voltage. Generally, it is a transformer, and there are other like KX power supplies, and then rectified to output DC voltage. As a result, his volume is large, bulky, inefficient, and heat-generating. He also has his advantages: small ripple, good adjustment rate, and small external interference. Suitable for use with analog circuits, various types of amplifiers, etc. PISTON RECIPROCATING COMPRESSOR AND AUXILIARY
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High-frequency forklift charger, his power device works in the switch state, (one open and one off, one open and one off, the frequency is very fast, the general flat switch power supply frequency is 100~200KHz, the module power supply is 300~500khz). In this way, his loss is small, the efficiency is high, and there is a requirement for the transformer, which is to be made of a material with high magnetic permeability. A little ink, his transformer is a small word. Efficiency 80% to 90%. It is said that the best VICOR module in the United States is as high as 99%. The efficiency of the switching power supply is small and small, but compared with the linear power supply, the voltage and current regulation rate is discounted.
Second, the use of power supply Commonly used power supply is divided into two types of power frequency transformer (core, 50Hz) linear power supply and high-frequency transformer (magnetic core, several thousand Hz) switching power supply.
The principle of the switching power supply is: first convert the AC frequency of the power frequency (50Hz) into a high-frequency current, and then convert it to a low voltage through a high-frequency transformer to output a low-voltage DC. Since the high-frequency transformer of the same power has a smaller volume than the power frequency---the higher the frequency, the smaller the volume, so it can be widely used because of its high power, small size, and light weight. His voltage regulation is mainly realized by controlling the oscillation frequency. It is also because of this, the switching power supply loses the voltage regulation performance if it is used for charging and is easy to emit harmonic interference, resulting in voltage fluctuation. because of its high-frequency interference or the frequency of mutation. At the same time, if the protection circuit of the switching power supply is not doing well, once the fault occurs, the voltage may suddenly rise a lot and burn the battery. So right, linear power supply should have a certain room for development.