The adjustable DC constant current source is mainly composed of three parts: rectification, voltage transformation, and voltage stabilization. Its working process is the mains AC input. After "rectification", the AC power becomes DC power, followed by "transformation" to convert the DC power. The 220V (commercial power) transformer is the rated voltage of the power supply. At this time, the voltage after the transformation is not stable. Finally, after the "regulation" part, the voltage after the transformer is sampled and stabilized to the rated output of the power supply.
The transformer is an important part of the power supply. When its temperature is too high, the efficiency of the power transformer will decrease, and it may even cause damage to the power supply. In addition to the transformer, the main heating components inside the adjustable DC constant current source include switch tubes, inductors and diodes. Due to their own reasons, these components are unavoidably hot. What we can do is to minimize their temperature rise.
transformer
The main reasons for the temperature rise of the transformer in operation are overload, magnetic loss, copper loss, etc. The methods to reduce the temperature rise of the adjustable DC constant current source transformer are: 1. Use thicker copper wire within a reasonable range to reduce the copper wire resistance (the greater the current flowing through the copper wire, the higher the heat generated); 2. Transformer core uses materials with lower permeability or other core materials that can reduce magnetic loss (the greater the power, the higher the core temperature); 3. It is recommended not to use the power supply at full load (the larger the load, the transformer heats up) The bigger); 4. Add a cooling fan to increase the cooling capacity of the power supply.
turning tube
The heat of the switch tube is mainly caused by the opening and closing of the switch tube, that is, the loss of the switch. The switching loss is divided into the switching process loss and the on-state loss. The methods to reduce the temperature rise of the adjustable DC constant current source switch tube are: 1. The low on-state resistance can reduce the on-state loss of the diode; 2. The switching process loss can be lower by selecting the switching loss and recovering the loss Device to reduce; 3. Use soft switching technology; 4. Increase the overall heat dissipation performance of the power supply, such as adding a fan.
diode
When the diode is turned on, it consumes electric power. The larger the passing current, the greater the electric power consumption and the higher the temperature. Diode heating is unavoidable. If you want to reduce the heating as much as possible, you can choose a high-quality, slightly more powerful diode, or increase the overall heat dissipation performance of the power supply, such as adding heat sinks and fans.
inductance
Similar to the transformer, it will not be elaborated here.
When the adjustable DC constant current source is working, the temperature rise is normal, but when the temperature is too high, you need to pay attention to it. The means provided above are not absolute, and comprehensive measures should be taken according to the actual situation of the power supply.
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