DC Power Supply Quality Inspection Methods and Main Functions

The technical indicators of DC power supply can be divided into two categories. One is the characteristic indicators, which usually include the voltage allowed to be transmitted, the voltage and current output and the voltage adjustment range. Today I will show you the DC power supply quality detection methods and main functions.

There is also a quality index, which is used to measure the stability of the DC power supply, mainly including the coefficient of stable voltage, the delivered resistance, ripple voltage and temperature coefficient, etc.

1. DC power supply quality detection method:

(1) Ripple voltage of DC power supply: refers to the highest AC voltage component in the power supply output. You can use an oscilloscope to view its peak value in the DC power supply. The detected result will be accurate to the millivolt level and can also be used to detect the effective value, but the ripple is no longer a sine wave, so there will be some errors.

(2) Stable voltage coefficient: If the current load current and temperature are constant, changes in the transmission voltage will cause the voltage output of the DC power supply to also change accordingly.

(3) Adjustment probability of current pressure: The relative change of voltage input is the change of voltage output by plus or minus 10%. Both stable voltage trim and voltage trim settings represent the effect of changing the input voltage on the output voltage, so only one of them needs to be tested.

2. Main functions of DC power supply:

The oscilloscope function of the DC power supply can display waveforms in real time, and can be transmitted to the computer for analysis and processing using communication tools. The USB flash drive is used for data access, which is convenient and easy to use. It has multiple fault protection functions, has strong reliability, and does not take up space. People can move.

For DC power supplies, especially DC stabilized power supplies, the size of this ripple is very important. If you don't pay attention to ripple, large ripple will cause surge voltage or current, and in severe cases, the equipment will be burned out.

The following are some manifestations of ripple hazards:

(1) Will reduce the efficiency of the power supply.

(2) Undesirable harmonics will be generated during use, and harmonics will cause greater danger.

(3) Noise will be generated, making imaging equipment and audio equipment unusable.

(4) It will cause interference to the digital power supply, which may result in failure to operate normally. There is also a quality index, which is used to measure the stability of the DC power supply, mainly including the coefficient of stable voltage, the delivered resistance, ripple voltage and temperature coefficient, etc.

1. DC power supply quality detection method:

(1) Ripple voltage of DC power supply: refers to the highest AC voltage component in the power supply output. You can use an oscilloscope to view its peak value in the DC power supply. The detected result will be accurate to the millivolt level and can also be used to detect the effective value, but the ripple is no longer a sine wave, so there will be some errors.

(2) Stable voltage coefficient: If the current load current and temperature are constant, changes in the transmission voltage will cause the voltage output of the DC power supply to also change accordingly.

(3) Adjustment probability of current pressure: The relative change of voltage input is the change of voltage output by plus or minus 10%. Both stable voltage trim and voltage trim settings represent the effect of changing the input voltage on the output voltage, so only one of them needs to be tested.

2. Main functions of DC power supply:

The oscilloscope function of the DC power supply can display waveforms in real time, and can be transmitted to the computer for analysis and processing using communication tools. The USB flash drive is used for data access, which is convenient and easy to use. It has multiple fault protection functions, has strong reliability, and does not take up space. People can move.

For DC power supplies, especially DC stabilized power supplies, the size of this ripple is very important. If you don't pay attention to ripple, large ripple will cause surge voltage or current, and in severe cases, the equipment will be burned out.

The following are some manifestations of ripple hazards:

(1) Will reduce the efficiency of the power supply.

(2) Undesirable harmonics will be generated during use, and harmonics will cause greater danger.

(3) Noise will be generated, making imaging equipment and audio equipment unusable.

(4) It will cause interference to the digital power supply, which may result in failure to operate normally.

HZ-3140A Transformer DC resistance tester