A brief discussion on switching regulated power supply and linear regulated power supply
A stabilized voltage supply is an electronic device that can provide stable AC or DC power to a load, including two categories: AC stabilized power supply and DC stabilized power supply.
When there is a momentary fluctuation in the voltage or load of the power grid, the regulated power supply will compensate for the voltage amplitude with a response speed of 10-30ms, stabilizing it within ± 2%.
major function
Stable voltage
When there is an instantaneous fluctuation in the voltage or load of the power grid, the regulated power supply will compensate for the voltage amplitude with a response speed of 10-30ms, stabilizing it at ± 2%
Inside.
Multi functional comprehensive protection
In addition to the basic function of stabilizing voltage, voltage regulators should also have the most basic protection functions of overvoltage protection (exceeding+10% of the output voltage), undervoltage protection (below -10% of the output voltage), phase loss protection, and short-circuit overload protection.
Sharp pulse suppression
The power grid sometimes experiences sharp pulses with high amplitude and narrow pulse width, which can penetrate electronic components with lower voltage resistance. The anti surge components of the regulated power supply can effectively suppress such sharp pulses.
Switching power supply is a relatively new type of power supply. It has the advantages of high efficiency, light weight, adjustable voltage, and high output power. However, due to the circuit operating in a switch state, the noise is relatively high. Through the following diagram, let's briefly explain the working principle of a step-down switching power supply. As shown in the figure, the circuit consists of switch K (in actual circuits, it is a transistor or field-effect transistor), freewheeling diode D, energy storage inductor L, filtering capacitor C, etc. When the switch is closed, the power supply supplies power to the load through switch K and inductor L, and stores some of the electrical energy in inductor L and capacitor C. Due to the self inductance of inductor L, the current increases relatively slowly after the switch is turned on, meaning that the output cannot immediately reach the power supply voltage value. After a certain period of time, the switch is turned off, and due to the self inductance effect of inductor L (which can be vividly considered as the inertia effect of the current in the inductor), the current in the circuit will remain unchanged, that is, continue to flow from left to right. This current flows through the load, returns from the ground, flows to the positive terminal of the freewheeling diode D, passes through the diode D, and returns to the left end of the inductor L, thus forming a circuit. By controlling the closing and opening time of the switch (i.e. PWM - Pulse Width Modulation), the output voltage can be controlled. If the on/off time is controlled by detecting the output voltage to maintain the output voltage constant, the purpose of voltage stabilization is achieved.
