[introduction] switch power source uses high-power to control switch canal to undertake high-speed guides through circuit namely with end. Offer alternating current of high-frequency of dc translate into transformer to undertake transformation, group or the one much group tension that produce a need thereby.

One, brief introduction of power of switch power source

Switch power source uses high-power to control switch canal to undertake high-speed guides through circuit namely with end. Offer alternating current of high-frequency of dc translate into transformer to undertake transformation, group or the one much group tension that produce a need thereby.

Translate into is high frequency the reason of alternating current is high frequency communication the efficiency in transformer transformation circuit should compare 50Hz a lot of taller. What so switch transformer can do is very small, and not be very hot when the job, cost is very low. If do not turn into 50Hz power source of high frequency switch with respect to no point.

2, principle of job of switch power source

? Input of alternating current source becomes dc via rectification filter wave;

? Through modulation of width of pulse of high frequency PWM() signal controls switch to be in charge of, that dc adds switch transformer primary on;

? Sub induction gives switch transformer high frequency voltage, supply of wave of classics commutate filter is laden;

? Output feedbacks to dominate circuit through certain circuitry partly, control PWM occupies sky comparing, in order to achieve the goal of stable output;

? When alternating current source is inputted, want to sort an a kind thing through be stranded commonly, filter the interference on electrified wire netting, the power source interference to electrified wire netting also filters in the meantime;

? When power is same, switch frequency is taller, the volume of switch transformer is minorrer, but the demand that provides to switch is higher;

? Of switch transformer sub and OK many winding or a winding have many take a percentage of a deal, in order to get the output of need;

? Circuit of a few protection has been like general metropolis remarks to flow (OCP) is pressed too (OVP) is too lukewarm (OTP) protects a characteristic, otherwise may power source of burn down switch.

3, representative application develop attacks graph

4, LLC circuitry uses explanation

LLC resonance is half bridge, complete bridge circuitry is commonly used at high-power switch power source, it is the ideal option that 800W uses to 2000W. Because use 0 voltage switch (ZVS) and achieved very tall work efficiency, in reduce switch loss substantially while still can have higher power density, can apply extensively on server power source, high-power power source.

The BV that lucky dark semiconductor offers contains FRD to be able to be used completely on syntonic circuit at the same time for the MOS exceeding a written guarantee of 600V, 650V, have high speed fast restore diode (FRD) , restore time shortly reversely (Trr) , apply to the application that flows to recover loss via can be being brought about when main body diode when second birth electric current. Have current density at the same time speed of strong, switch uses capacity of tall, short circuit quickly, easily sexual good characteristic, what can satisfy a client is efficient high reliability demand. Father to reach high-power power supply of exacting can effect target, can use SGT MOS of the low pressure in the synchronous commutate of lucky dark semiconductor, the MOS exceeding a written guarantee that reason chooses lucky dark semiconductor cooperates low-pressure SGT MOS to achieve taller changeover efficiency completely, close solid is durable, systematic cost is inferior. Go up additionally the high-power switch power source of kilowatt, ask its are efficient, power density tall, bulk small, weight light, cost is low, carborundum of lucky dark semiconductor is used on PFC circuitry (SiC) the power density that diode can promote high-power switch power source and efficiency, reduced switch loss effectively.

5, product of application of high-power switch power source is recommended

According to the demand that high-power switch power source provides to MOS, recommend lucky dark semiconductor the following range of products:

(origin: RS luck dark semiconductor)

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