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DC power supply quality index
Voltage regulation rate Voltage regulation rate is an important index that characterizes the quality of the voltage regulation performance of a DC regulated power supply. , also known as voltage stabilization coefficient or stability coefficient, which represents the degree of stability of the output voltage of a DC regulated power supply when the input voltage changes, usually expressed as the percentage of the relative change of the input and output voltages under unit output voltage. The voltage regulation formula is shown in the figure. Current regulation rate Current regulation rate is a major self-index that reflects the load capacity of a DC regulated power supply, also known as the current stability coefficient. It represents the ability of a DC regulated power supply to suppress fluctuations in output voltage caused by changes in load current (output current) when the input voltage remains unchanged. Under the conditions of specified load current changes, it is usually measured in unit output voltage. The percentage of the output voltage change value represents the current regulation rate of the DC regulated power supply. The current regulation rate formula is shown in the figure. Ripple suppression ratio The ripple suppression ratio reflects the ability of the DC stabilized power supply to suppress the mains voltage introduced at the input end. When the input and output components of the DC stabilized power supply remain unchanged, the ripple suppression ratio The wave suppression ratio is often expressed as the ratio of the peak-peak value of the input ripple voltage to the peak-peak value of the output ripple voltage. It is generally expressed in decibels, but sometimes it can also be expressed as a percentage, or directly as the ratio of the two.
Temperature stability The temperature stability of the integrated DC regulated power supply is measured as the relative change percentage of the output voltage of the DC regulated power supply within the specified maximum variation range of the operating temperature of the DC regulated power supply. The temperature stability formula is shown in Figure 3.
DC power supply limit indicators
The maximum input voltage is the maximum input voltage that ensures the safe operation of the DC regulated power supply.
The maximum output current is the maximum output current allowed to ensure the safe operation of the voltage regulator.
Edit this paragraph Parallel Stabilized Power Supply
Although the DC voltage output after rectification and filtering is smoother, its stability is still relatively poor. The reasons mainly include the following aspects. Due to the unstable input voltage (usually the AC power grid allows certain fluctuations), the output DC voltage of the rectifier filter circuit is unstable. Due to the internal resistance of the rectifier and filter circuit, when the load changes, the load current changes, causing the output DC voltage to change. Since the parameters of electronic components (especially conductor components) are related to temperature, when the ambient temperature changes, the parameters of the circuit components will change, causing the output voltage to change. There will still be a small amount of ripple in the DC voltage obtained after rectification and filtering, and it cannot be directly supplied to circuits that require higher power quality. Therefore, the rectified and filtered DC voltage must take certain voltage stabilization measures to meet the needs of electronic equipment. Commonly used DC voltage stabilizing circuits include parallel and series voltage stabilizing circuits.
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