18650 rechargeable battery lithium 3.7v 3500mah
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18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah
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  Analysis of technical indicators of DC regulated power supply

  The technical indicators of DC stabilized power supplies can be divided into two categories: one is the characteristic indicators, which reflect the inherent characteristics of the DC stabilized power supply, such as input voltage, output voltage, output current, and output voltage adjustment range; the other is quality indicators. , reflecting the advantages and disadvantages of the DC regulated power supply, including stability, equivalent internal resistance (output resistance), ripple voltage and temperature coefficient, etc.

  Characteristics

  (1) Output voltage range

  The output voltage range that can work normally under the conditions of DC regulated power supply. The upper limit of this indicator is specified by the maximum input voltage and the minimum input-output voltage difference, while its lower limit is determined by the reference voltage value inside the DC regulated power supply.

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  (2) Maximum input-output voltage difference

  This indicator represents the maximum allowable voltage difference between input and output under the normal working conditions of the DC regulated power supply. Its value mainly depends on the withstand voltage index of the internal adjustment transistor of the DC regulated power supply.

  (3) Minimum input-output voltage difference

  This indicator represents the minimum input-output voltage difference required to ensure the normal working conditions of the DC regulated power supply.

  (4) Output load current range

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  The output load current range is also called the output current range. Within this current range, the DC regulated power supply should be able to ensure that it meets the indicators given in the indicator specifications.

  Quality Index

  (1) Voltage regulation rate SV

  The voltage regulation rate is an important indicator that characterizes the voltage stabilization performance of a DC regulated power supply. It is also called the voltage regulation coefficient or the stability coefficient. It represents the degree to which the output voltage VO of the DC regulated power supply is stable when the input voltage VI changes. It is usually expressed as Expressed as a percentage of the relative change in input and output voltage per unit output voltage.

  (2) Current adjustment rate SI

  The current regulation rate is an important self-index that reflects the load capacity of the DC regulated power supply, and is also called 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.

  (3) Ripple suppression ratio SR

  The ripple suppression ratio reflects the ability of the DC regulated power supply to suppress the mains voltage introduced at the input end. When the input and output conditions of the DC regulated power supply remain unchanged, the ripple suppression ratio is often calculated as the input ripple voltage peak-peak value and The peak-to-peak ratio of the output ripple voltage is generally expressed in decibels, but sometimes it can also be expressed as a percentage, or directly as the ratio of the two.

  (4) Temperature stability K

  The temperature stability of the integrated DC stabilized power supply is based on the relative change in the output voltage of the DC stabilized power supply within the specified maximum variation range of the DC stabilized power supply operating temperature Ti (Tmin ≤ Ti ≤ Tmax).

  extreme index

  (1) Maximum input voltage

  It is the maximum input voltage that ensures the safe operation of the DC regulated power supply.

  (2) Maximum output current

  It is the maximum output current allowed to ensure the safe operation of the voltage regulator.


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