Direct current (DC) power supply specifications are generally categorized into two types. The first is the quality specification, which measures the stability of the power supply's output voltage. This primarily involves the voltage regulation coefficient, output resistance, ripple voltage, and temperature coefficient. The second type is the characteristic specification, which refers to the degree of adjustability for output voltage and current, as well as input voltage and current.
(1) Ripple Voltage: Ripple voltage refers to the AC component superimposed on the output voltage, which can be observed using an oscilloscope and is typically in the millivolt range. It can also be measured with an AC millivolt meter, but since ripple is not pure sine wave, it can introduce some error. (2) Voltage Regulation Ratio: To ensure that changes in the input voltage of a DC power supply do not affect the output voltage, it is crucial to maintain a constant load current and ambient temperature. (3) Output Resistance: The output resistance of a DC power supply is similar to that of an amplifier. Its value is generally determined by the ratio of the change in output voltage to the change in output current, with the input voltage remaining constant. Products include 36V aviation power supply, 400Hz frequency converter power supply, 115/200V power supply, 27V DC power supply, 400Hz power supply, and aviation power supply.
