Switching power supply main use
Switching power supply products are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, electric power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, LCD monitors, LED lamps and lanterns, communication equipment, audio-visual products, security monitoring. LED light bag, computer chassis, digital products and instruments class and other fields.
48v switching power supply working principle
1. AC power input rectified and filtered into DC;
2. Through the high-frequency PWM (Pulse Width Modulation) signal control switching tubes, will be the DC to the switching transformer on the primary;
3. Switching transformer secondary inducted high-frequency voltage, rectified and filtered to supply the load;
4.
4. The output part is fed back to the control circuit through certain circuits to control the PWM duty cycle to achieve the purpose of stabilizing the output.
5. AC power input is generally to go through a current loop things, filter out the interference on the grid, but also filter out the power supply on the grid interference;
6. In the same power, the higher the switching frequency, switching transformer size is smaller, but the higher the requirements of the switching tube;
7. Switching transformer secondary can have more than one winding or a winding with multiple taps, the switching transformer secondary can have more than one winding or a winding with multiple taps, the switching transformer secondary can have more than one winding or a winding with more than one tap, the switching transformer secondary can have more than one winding or a winding with more than one tap, the switching transformer secondary can have more than one winding or a winding with more than one tap. The secondary of the switching transformer can have multiple windings or a winding with multiple taps to get the desired output;
8. Generally, some protection circuits should be added, such as no-load, short-circuit and other protections, or else the 48V switching power supply may be burned.
Precautions on the use of switching power supply
1) Before using the power supply, determine whether the input and output voltage specifications and the nominal value of the power supply used to match;
2) Before powering on the power supply, check whether the input and output leads are connected correctly, so as to avoid damage to the user's equipment;
3) Check the installation of the installation is solid, the mounting screws and the power supply board devices have no contact, and measure the insulation between the shell and the input and output. Measure the insulation resistance of the shell and the input and output to avoid electric shock;
4) In order to ensure the safety of use and reduce interference, please ensure that the ground terminal is reliably grounded;
5) The power supply with multiple outputs is generally divided into the main and auxiliary outputs, and the main output characteristics are better than the auxiliary outputs, and the main output with a large output current is generally the main output. In order to ensure that the output load adjustment rate and output dynamics and other indicators, generally require each road with at least 10% of the load. If you use the auxiliary circuit without the main circuit, the main circuit must be added to the appropriate dummy load. See the specifications of the corresponding model;
6) Please note: Frequent switching of the power supply will affect its life;
7) The working environment and the degree of load will also affect its life.