Nowadays the world is the informationization time, the informationization fast development causes the people regarding the electronic installation, the product dependence to be more and more big, but these electronic installation, the product cannot leave the power source.The switching power supply is opposite in the linear power source has aspect and so on efficiency, volume, weight superiority, the high frequency switching power supply is becoming in particular lighter, smaller, the efficiency is higher, also is more reliable, this enabled the high frequency switching power supply to become has applied the most widespread power source.The switching power supply is uses the modern electric power electronic technology, the controlling switch transistor breakover and the separation principle, the maintenance stable output voltage one kind of power source.Looked from the switching power supply composition that, it mainly is composed by two parts: Power level and control level.The power level primary mission is the basis different application situation and the request, chooses the different topology, simultaneously gives dual attention to the transistor unit consideration design cost; The control level primary mission is acts according to the electric circuit electrical signal choice appropriate control mode, the present switching power supply by the PWM control mode majority.
Nowadays the world is the informationization time, the informationization fast development causes the people regarding the electronic installation, the product dependence to be more and more big, but these electronic installation, the product cannot leave the power source.The switching power supply is opposite in the linear power source has aspect and so on efficiency, volume, weight superiority, the high frequency switching power supply is becoming in particular lighter, smaller, the efficiency is higher, also is more reliable, this enabled the high frequency switching power supply to become has applied the most widespread power source.<br>The switching power supply is uses the modern electric power electronic technology, the controlling switch transistor breakover and the separation principle, the maintenance stable output voltage one kind of power source.Looked from the switching power supply composition that, it mainly is composed by two parts: Power level and control level.The power level primary mission is the basis different application situation and the request, chooses the different topology, simultaneously gives dual attention to the transistor unit consideration design cost; The control level primary mission is acts according to the electric circuit electrical signal choice appropriate control mode, the present switching power supply by the PWM control mode majority.
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