DC power quality indicator detection method - Database & Sql Blog Articles

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Technical specifications of DC power supplies are generally divided into two main categories: characteristic indices and quality indices. The characteristic indices include the input voltage range, output voltage, output current, and the adjustable range of the output voltage. These parameters define the basic performance and capabilities of the power supply.

The quality indices, on the other hand, evaluate the stability and purity of the delivered DC voltage. They include the voltage regulation coefficient, output impedance, ripple voltage, and temperature coefficient. These indicators reflect how well the power supply can maintain a stable output under varying conditions.

The author below provides a brief overview of how to test the quality indicators of a DC power supply:

1. Ripple Voltage: This refers to the AC component that is superimposed on the DC output. It can be measured using an oscilloscope to observe its peak-to-peak value, which is typically in the millivolt range. Alternatively, an AC millivoltmeter can be used, although it may introduce some errors since ripple is not a pure sine wave. Usually, the ripple voltage (VP-P) of a DC power supply should be less than or equal to 10 mV.

2. Voltage Regulation Coefficient: This measures how much the output voltage changes when the input voltage varies, while keeping the load current and ambient temperature constant. A lower coefficient indicates better stability.

3. Load Regulation: This refers to the change in output voltage when the load current changes. It is usually tested by keeping the input voltage constant and varying the load. The smaller the change in output voltage, the better the power supply's performance.

4. Temperature Coefficient: This measures how the output voltage changes with temperature. A low temperature coefficient ensures that the power supply remains stable across different operating environments.

Testing these parameters helps ensure that the DC power supply meets the required standards for reliability and performance in various applications. Whether you're working with sensitive electronics or industrial equipment, understanding and testing these characteristics is essential for maintaining system integrity and efficiency.