source:Industry News Popular:adapter release time:2022-04-13 10:30:41 Article author:yu
The power consumption of the switching power supply includes fixed losses due to parasitic resistances of semiconductor switches, magnetic elements, wiring, etc., and switching losses during switching operations. For the fixed loss, since it mainly depends on the characteristics of the component itself, it needs to be suppressed by the improvement of component technology. In terms of magnetic components, there has been a long history of research on low-loss winding methods that take into account both the skin effect and the adjacent wire effect. In order to reduce the switching loss caused by the switching surge caused by the leakage inductance of the transformer, new circuit technologies such as a snubber circuit with a surge energy regeneration function have been developed.
The following are circuit and system methods for improving the efficiency of switching power supplies:
The first method: ZVS (Zero Voltage Switching), ZCS (Zero Current Switching) and other methods that use resonant switching to reduce switching losses.
This is very effective for reducing switching losses, but the problem is that fixed losses due to peak current and peak voltage will increase.
The second method is to use the edge resonance (Edge ResONance) represented by the active clamp circuit to reduce the switching loss.
This method is an active snubber (Active Snubber) developed to solve this problem, which is a very practical ZVS method; however, the problem of efficiency drop caused by reactive current under light load conditions is one of the problems Big flaw.
The third method is to reduce the fixed loss by extending the on-time of the switching element to suppress the peak current.
In this method, it is more effective to use a tap sensor, which can cope with the surge phenomenon caused by leakage inductance.
The fourth method: in the case of low voltage and high current, the fixed loss is reduced by improving the synchronous rectifier circuit.
The two-stage structure is one of the methods to realize the efficient operation of the synchronous rectifier circuit. It adopts a fixed time ratio close to 0.5, and the output voltage is controlled by the converter of the previous stage. It contradicts the traditional thinking mode of "two-stage structure will lead to lower efficiency", and is very effective in low voltage and high current occasions.
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