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Talking about the difference between switching power supply and
AddTime：2017-04-21 13:35:31
The advantages and disadvantages of contrast and difference between switching power supply and linear power supply, DC power supply is required to use different linear DC power supply, the output is the best he linear DC, can be used in applications requiring high switching DC power supply, the second, he is by the transformer and switch to high speed tube characteristics small weight, large capacity, high quality output, phase control power on demand is not high, the current large occasions linear power supply, switching power supply from linear power adjustment tube in amplifying state, so a large amount of heat, low efficiency (about 35%), with large volume heat sink, but also the need of power the transformer is also large, when making multiple voltage output transformer will be larger.
The regulating tube of the switching power supply works in saturation and up to the end state, so the heat generation is small, the efficiency is high (more than 75%), and the transformer with large volume is omitted. But the above DC switching power supply output will ripple larger (50mV at 5V output typical stack), at the output end and connected with a voltage stabilizing diode can be improved, because the switch will produce peak pulse interference greatly, also need in the circuit in series to improve magnetic beads. In contrast, the linear power supply has no more defects, and its ripple can be very small (less than 5mV).
For power efficiency and installation volume requirements, switching power supply is better, and for electromagnetic interference and power purity requirements (such as capacitance, leakage detection), linear power is used. In addition, when the circuit needs to be isolated, most of the DC-DC is now used to power the isolation section (DC-DC, in its work, the switching power supply). Also, the high frequency transformer used in the switching power supply may be troublesome.
Switching power supply and linear power supply is completely different in internal structure, switching power supply has the switch, it uses variable duty cycle to achieve different voltage or frequency, to realize the complex, the biggest advantage is the high efficiency, in general more than 90%, the disadvantage is the wave and switching noise, suitable for high on the wave and noise requirement; and no linear power supply switch, belonging to the continuous analog control, the internal structure is relatively simple, the chip area is small, low cost, has the advantages of low cost, the wave noise is small, the biggest drawback is the low efficiency. They have their own shortcomings and complement each other in their application!
First, the principle of linear power supply:
The linear power supply mainly includes power frequency transformer, output rectifying filter, control circuit, protection circuit and so on. Linear power supply is the first AC power through the transformer, then the DC voltage not stable after the rectifier rectifier filter, to achieve high precision DC voltage, the voltage feedback must pass through the adjustment of the output voltage, the power supply technology is mature, can achieve high stability, the ripple is very small, and there is no interference and noise the switching power supply has the. But its disadvantage is large and heavy transformer, the volume and weight of the filter capacitor required is quite large, and the voltage feedback circuit is operating in the linear state regulator has a certain voltage drop in output large working current, resulting in too much power regulator the low conversion efficiency, but also install a large heat sink. This power supply is not suitable for the needs of computers and other equipment, will gradually be replaced by switching power supply.
Two 、 the principle of switching power supply:
The switching power supply mainly includes input grid filter, input rectifier filter, inverter, output rectifier filter, control circuit and protection circuit. Their function is:
1. Input network filter: eliminate the interference from the power grid, such as motor start, electrical switches, lightning, etc., and also prevent the high-frequency noise generated by the switching power supply to the power grid.
2 、 input rectifier filter: the input voltage of the grid is rectified and filtered to provide DC voltage for the converter.
3: inverter: switching power supply is a key part. It converts the DC voltage to a high frequency AC voltage and plays a part in isolating the output part from the input grid.
4 、 output rectifier filter: the converter output high-frequency AC voltage rectifier filter to obtain the required DC voltage, but also to prevent high-frequency noise on the load interference.
5 、 control circuit: detect the output DC voltage, and compare it to the reference voltage to enlarge. Modulating the pulse width of the oscillator to control the converter to maintain the stability of the output voltage.
6 、 protection circuit: when the switching power supply over-voltage, over-current short circuit, the protection circuit to make switching power supply stop working to protect the load and the power supply itself.
A switching power supply converts an alternating current into a direct current, which converts a DC reverse into an alternating current. Thus, the switching power supply eliminates the transformer in the lower linear power supply as well as the voltage feedback circuit. The switching power supply inverter circuit is fully digital adjustment, the same can achieve very high adjustment accuracy.
Main advantages of switching power supply:
Small size, light weight (volume and weight only linear power of 20 ~ 30%), high efficiency (generally 60 to 70%, while linear power supply is only 30 to 40%), and its strong anti-interference, wide range of output voltage, modular.
Switching power supply is achieved by electronic technology, the main link: Rectifier into direct current - inverter into the required voltage of alternating current (mainly to adjust voltage) - and then rectified into direct current voltage output. There is no transformer and heat sink in the structure of switching power supply, so the volume is very small. Meanwhile, the switching power supply is internal
The regulating tube of the switching power supply works in saturation and up to the end state, so the heat generation is small, the efficiency is high (more than 75%), and the transformer with large volume is omitted. But the above DC switching power supply output will ripple larger (50mV at 5V output typical stack), at the output end and connected with a voltage stabilizing diode can be improved, because the switch will produce peak pulse interference greatly, also need in the circuit in series to improve magnetic beads. In contrast, the linear power supply has no more defects, and its ripple can be very small (less than 5mV).
For power efficiency and installation volume requirements, switching power supply is better, and for electromagnetic interference and power purity requirements (such as capacitance, leakage detection), linear power is used. In addition, when the circuit needs to be isolated, most of the DC-DC is now used to power the isolation section (DC-DC, in its work, the switching power supply). Also, the high frequency transformer used in the switching power supply may be troublesome.
Switching power supply and linear power supply is completely different in internal structure, switching power supply has the switch, it uses variable duty cycle to achieve different voltage or frequency, to realize the complex, the biggest advantage is the high efficiency, in general more than 90%, the disadvantage is the wave and switching noise, suitable for high on the wave and noise requirement; and no linear power supply switch, belonging to the continuous analog control, the internal structure is relatively simple, the chip area is small, low cost, has the advantages of low cost, the wave noise is small, the biggest drawback is the low efficiency. They have their own shortcomings and complement each other in their application!
First, the principle of linear power supply:
The linear power supply mainly includes power frequency transformer, output rectifying filter, control circuit, protection circuit and so on. Linear power supply is the first AC power through the transformer, then the DC voltage not stable after the rectifier rectifier filter, to achieve high precision DC voltage, the voltage feedback must pass through the adjustment of the output voltage, the power supply technology is mature, can achieve high stability, the ripple is very small, and there is no interference and noise the switching power supply has the. But its disadvantage is large and heavy transformer, the volume and weight of the filter capacitor required is quite large, and the voltage feedback circuit is operating in the linear state regulator has a certain voltage drop in output large working current, resulting in too much power regulator the low conversion efficiency, but also install a large heat sink. This power supply is not suitable for the needs of computers and other equipment, will gradually be replaced by switching power supply.
Two 、 the principle of switching power supply:
The switching power supply mainly includes input grid filter, input rectifier filter, inverter, output rectifier filter, control circuit and protection circuit. Their function is:
1. Input network filter: eliminate the interference from the power grid, such as motor start, electrical switches, lightning, etc., and also prevent the high-frequency noise generated by the switching power supply to the power grid.
2 、 input rectifier filter: the input voltage of the grid is rectified and filtered to provide DC voltage for the converter.
3: inverter: switching power supply is a key part. It converts the DC voltage to a high frequency AC voltage and plays a part in isolating the output part from the input grid.
4 、 output rectifier filter: the converter output high-frequency AC voltage rectifier filter to obtain the required DC voltage, but also to prevent high-frequency noise on the load interference.
5 、 control circuit: detect the output DC voltage, and compare it to the reference voltage to enlarge. Modulating the pulse width of the oscillator to control the converter to maintain the stability of the output voltage.
6 、 protection circuit: when the switching power supply over-voltage, over-current short circuit, the protection circuit to make switching power supply stop working to protect the load and the power supply itself.
A switching power supply converts an alternating current into a direct current, which converts a DC reverse into an alternating current. Thus, the switching power supply eliminates the transformer in the lower linear power supply as well as the voltage feedback circuit. The switching power supply inverter circuit is fully digital adjustment, the same can achieve very high adjustment accuracy.
Main advantages of switching power supply:
Small size, light weight (volume and weight only linear power of 20 ~ 30%), high efficiency (generally 60 to 70%, while linear power supply is only 30 to 40%), and its strong anti-interference, wide range of output voltage, modular.
Switching power supply is achieved by electronic technology, the main link: Rectifier into direct current - inverter into the required voltage of alternating current (mainly to adjust voltage) - and then rectified into direct current voltage output. There is no transformer and heat sink in the structure of switching power supply, so the volume is very small. Meanwhile, the switching power supply is internal
