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    What are the methods to identify the performance of the power adapter?
    time:2019-07-05 09:58        Click volume:【152 】Times

    All electrical related products must pay attention to safe use, then how to pay attention to the safe use of the power adapter, we must first understand the performance of the power adapter. The following power adapter manufacturers Xiaobian for everyone to introduce the method of identifying the performance of the power adapter?

    First, the basic basis for identifying the power supply

    Voltage and current range, these are the two most easily determinable indicators, as long as they are calculated based on the power consumption of the circuit. However, if only a single DC voltage is used to power the UUT, consider testing the UUT's high and low supply voltage extremes.

    If the power supply is used to power the combined device, 75% to 90% of the maximum current required by the device is provided by one power supply, and an insufficient portion can be connected to two or more power supplies.

    1, response time

    When the power supply can be remotely controlled or the power supply is part of the test system, then a delay from the issuance of the control command to the stabilization of the power supply output to the desired value is a very important factor (eg, turning the voltage on or off).

    2, resolution

    The minimum adjustable increment of the output voltage or current as defined by the technical parameters.

    3, working mode

    Almost all DC power supplies operate in a constant voltage source mode, which means that the output voltage remains constant over the entire current range. There are also a number of power supplies that can operate in a value stream mode within a certain range.

    The range of variation of the power output is not limited by the voltage or current output capability of the power supply itself, but also related to the operating state of the power supply. In the adaptive mode, the power supply can automatically adjust the output range of the voltage or current under the premise of constant capacity.

    Second, the accuracy, expansion and security of the power supply

    1, parallel or series work

    When one power supply does not meet the required voltage or current range, two or more power supplies (or different outputs of the same power supply) can be used in parallel or in series

    2. Remote sensing characteristics

    In order to accurately control the voltage or current value on the load, any change in the circuit can be fed back to the regulator through a separate sensing channel, which corrects for any voltage drop between the UUT and the power supply.

    3, programmable

    Some power supplies make the power output programmable by changing the DC voltage or resistance value. In some applications, different test scenarios or different output voltage values are selected from the programmed program using the IEEE488 or RS-232 interface.

    4, overload protection

    Since a power supply is to be supplied to different circuits, the current flow of these circuits may be unknown. To avoid damage to the power supply, the range of the protection circuit needs to be set. Adding a protection diode to the power supply prevents damage caused by the polarity of the external power supply. The thermal sensor can also be used to prevent the power supply from being burned out due to continued operation of the power supply in an overload condition or ineffective cooling.

    Third, the root cause of potential damage inside the power supply

    1, stability

    When the line voltage or load current changes elbow, the output voltage of the DC power supply will also fluctuate. If a relatively constant power supply is supplied to the power supply, then only basic load regulation is required. The magnitude of stability is generally defined as the percentage of the output voltage at no load or full load, or the change in voltage.

    2, pulsation and noise

    The ideal DC power supply should provide pure DC, but there is always some interference, such as the ripple current and high frequency oscillations superimposed on the switching power supply (SMPS) output port. These two kinds of interference, together with the spike noise generated by the power supply itself, cause intermittent and random drift (PARD) of the power supply.

    3, internal impedance

    Relatively large internal resistance of the power supply has two disadvantages to the load. Firstly, it is not conducive to the operation of the load voltage regulator circuit. What is more unfavorable is that any change of the load current will cause the fluctuation of the output of the DC power supply. The effect is exactly the same as the impact of the pulse and noise on the test results.

    4, power transient response or recovery

    The magnitude of the power supply transient response and recovery time indicates the ability of the power regulator circuit to return to normal voltage when the output load suddenly changes. There are two parameters to calibrate the power supply transient response and recovery: one is the deviation of the output when the load suddenly changes; the other is the time it takes for the output to return to its original value. For the sake of uniformity, generally, when the load changes by 10%, the output deviation is calibrated with the millivolts of the output deviating from the peak voltage, and the recovery time is calibrated with the millivolts used to restore the output to the normal value.


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