DC power supply which principles, you know how much? We are a professional DC power supply, transformers, regulators, manufacturers, today Xiaobian will introduce some of the relevant principles of DC power, we want to help!


    First, the DC link in the design of soft power to pay attention to the following points:
    1, the voltage is the maximum input common-mode voltage of the integrated op amp. U is the maximum output voltage of the integrated op amp.
    2, the camera input voltage by U as an integrated op amp power supply, the integrated op amp can not exceed the maximum supply voltage.
    3, the maximum output current is the integrated amplifier output current is the penalty for the whole tube drive current, so the regulated power supply Sheng large output current can not exceed the integrated output of the maximum output current.
    4, adjust the tube current amplification factor of the product, in the design, the integrated op amp output current should have sufficient margin, when the regulated power supply output current is large, the adjustment level can be multi-tube composite connection Approach to improve the adjustment level of the current amplification factor boat to reduce the output current of the integrated op amp requirements.


    Second, the professional DC power supply manufacturers
    (1) voltage regulator with a small temperature coefficient, such as 2DW7C, or the use of temperature compensation with a new voltage reference circuit as a reference voltage. So that the two-stage voltage divider resistor divider R1 and R2 have the same resistance l: ll temperature coefficient.
    (2) select the tube characteristics close to a pair of amplifiers to form the differential amplification. The constant current source circuit is used instead of the collector load resistance and the pole resistance in the differential amplifier.
    (3) the amplification tube, voltage regulator, sampling voltage divider and other parts on a constant body, or on the regulator temperature is relatively constant parts, in a single tube amplification, the temperature compensation is more difficult. But the tube reference voltage and temperature coefficient of the emitter voltage of the amplifier tube to the temperature coefficient is more sensitive.


    Third, the over-current protection of DC power supply has a very important role
    DC power to work in different occasions to do a good job of its not only have to have their own excellent quality and long life but also in the power output of various protection measures to do in place.
    In the case of a load short circuit at the output of the DC power supply or an accident such as a loss of control of the control circuit such as overload, the internal current of the power source causes the current to flow through the high-power switching power transistor in the transformer, A sudden increase in consumption of heat damage, once the power supply is not equipped with over-current protection device, then the high-power switching power tube is likely to be damaged, resulting in power failure.
    The only way to effectively avoid power in the face of a variety of extreme circumstances when the effective protection of their own will not be damaged.


    Fourth, improve the output voltage stability of DC power supply is not difficult
    Voltage stability is an important power quality indicators. A regulated power supply load resistance and temperature are maintained, then a change in input voltage, the output voltage of the micro-variable will cause the power input voltage of the micro-variable ratio is the voltage stability of the power supply voltage.
    Now the stability of the voltage regulator circuit. In the general circuit diagram has this relationship: Ub2 = U. +0: -R.Ill. = Ub.i 10 U. In which the adjustment of the launch tube junction is relatively small, can adjust the reference tube tube between the input resistance than Single-ended output voltage multiplier, unstable input voltage stability is also very good.

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