Is there voltage between the positive and neutral lines of the 24v switching power supply?
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Is there voltage between the positive and neutral lines of the 24v switching power supply?

Posted Date: 2024-01-15

Is there voltage between the positive and neutral lines of the 24v switching power supply?

24V switching power supply is a common power supply used to provide stable DC voltage for electronic equipment. In this type of power supply, the voltage between positive and neutral depends on the system design and circuit connections.

First, let's take a look at the composition and working principle of a switching power supply. The switching power supply is mainly composed of input circuit, rectifier circuit, filter circuit and output circuit. The input circuit is responsible for inputting AC power into the switching power supply, the rectifier circuit converts AC power into DC power, the filter circuit smoothes the output current, and the output circuit supplies the DC voltage of the power supply to external devices.

In a 24V switching power supply, the positive pole is usually connected to the output of the rectifier circuit through a filter capacitor. When alternating current is input to the switching power supply, the rectifier circuit converts the alternating current into direct current and smoothes the output current through the filter capacitor. This DC voltage is passed to the output circuit and ultimately supplied to the device connected to the power source.

The voltage between positive and neutral depends on the system design and circuit connections. Generally speaking, when the input terminal of the switching power supply is directly connected to the neutral line, there will be no voltage between the positive electrode and the neutral line. This is because there is a circuit short between the positive and neutral wires, and current can flow along the path of lowest impedance, which is the neutral wire connected to ground. In this case, the positive and neutral wires of the switching power supply are considered to be of equal potential, with no voltage difference.

However, in certain designs and circuit connections, there may be a voltage difference between the positive and neutral wires. This is usually due to the insulation between the input of the switching power supply and the mains input voltage, resulting in electrical isolation between the input and neutral. In this case, there may be a certain voltage difference between the positive and neutral lines of the power supply, the size of which depends on the insulating material and degree of insulation.

In addition, switching power supplies may also have some interference or AC components. These interference sources may introduce a certain voltage difference between the positive and neutral wires. This interference voltage is often called "drift", which may be caused by deficiencies in power supply design, poor circuit connections, cable or line interference, and other factors.

In summary, there may be a voltage difference between the positive and neutral lines of the 24V switching power supply, depending on the system design and circuit connection. In some cases, there may be no voltage difference between them because they are considered equal potential. In other cases, there may be a voltage difference between the positive and neutral wires, which may be caused by electrical isolation between the power input and the neutral wire. In addition, the switching power supply may be affected by some interference sources, further increasing the voltage difference between the positive and neutral lines.


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