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Isolation switch power supply and non-isolated switching power supply advantages and disadvantages,

Isolation switch power supply and non-isolated switching power supply advantages and disadvantages,

Answer:

First of all from the name can be seen, isolated switching power supply is isolated, that is input and output is not connected (in fact, there is a small capacitor between input and output), even if the power is broken, the input voltage is not Will be added to the output, due to the input and output isolation, the input part of the noise will not be transmitted to the output part (non-switching noise), isolated power supply mostly AC-DC, is AC to DC, can also be used for DC to exchange (such as Inverter), the voltage output is generally fixed or adjustable range is relatively narrow, but the output voltage is very wide, such as the input is 220V AC, the output can be 3V, it can be 30V, it can be 3000V, it can be 30000V Non-isolated switching power supply is generally DC-DC, that is, we often say that the DC to DC, the general non-isolated power supply efficiency than isolated power supply efficiency, but because the input and output are connected between, so there is a total (BUCK) If the switch tube breakdown, the input part of the voltage will pass to the output, the boost type of the type of noise, that is, when the input voltage is noisy, it is easy to pass to the output, (BOOST) If the circuit does not work, the input voltage will go straight to the output, whether it is buck or boost type, adjustable range is wide, step-down type can generally from 0 to the input voltage (due to the circuit Voltage drop, actually less than the input voltage), step-up type can be from the input voltage to several times higher than the input voltage There is also a non-isolated circuit up and down (SEPIC), the input voltage can be higher than the output voltage, but also lower than the output voltage, and the output voltage adjustment range is relatively wide
Isolation type: Advantages: before and after the isolation, after the level of the earth without dangerous voltage, the output voltage can be equal to the input voltage or can contain a range of input voltage Disadvantages: larger, or the same size of the power smaller Scope of application: the occasion of electricity supply (such as computer power); signal detection to isolate the collection of occasions (such as electrocardiograph)
Non-isolated type: Advantages: simple structure, small size, low cost; wide output voltage adjustment range Disadvantages: before and after the isolation, if the electricity supply, people touch the power output or the end of the ground may be risk of electric shock; only boost or buck or polarity conversion, the output voltage can not be equal to the input voltage. Scope: Input is within 36V low voltage (such as battery power supply); the entire circuit, including the ground can not be exposed to the occasion (such as dimming lamp)

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