[introduction]The adapter under rated power 75W but fractionize is: Parts of an apparatus of controller of capacitor of output of commutator of input filter, diode, input, IC, auxiliary power source, magnetic component, power and radiator. Compositive solution is narrowing and simplify converter respect had obtained great progress, current odd package is magnetic component, input ” high capacity ” capacitor, output capacitor and EMI input class. Much research and engineering work concentration are in high frequency communicating / on dc converter design, in order to reduce the size of magnetic component. However, capacitor of input high capacity holds as identical as the magnetic component inside adapter or larger volume.

The adapter under rated power 75W but fractionize is: Parts of an apparatus of controller of capacitor of output of commutator of input filter, diode, input, IC, auxiliary power source, magnetic component, power and radiator. Compositive solution is narrowing and simplify converter respect had obtained great progress, current odd package is magnetic component, input ” high capacity ” capacitor, output capacitor and EMI input class. Much research and engineering work concentration are in high frequency communicating / on dc converter design, in order to reduce the size of magnetic component. However, capacitor of input high capacity holds as identical as the magnetic component inside adapter or larger volume.

The capacitance of input high capacity that the new-style IC MinE-CAP of Power Integrations aims to solve general input to design optimizes a problem. The PowiGaN nitrogen that uses Power Integrations changes gallium technology, minECAP can be rated voltage the capacitor of 160 V to be used at general input design surely, reduce volume of high capacity capacitor thereby be as high as 50% .

MinE-CAP is with low-pressure capacitor (graph 1 medium CLV) the circuit of low impedance switch of series connection. The voltage of two end of its surveillance CLV, increase around threshold value in input circuitry voltage / when decreasing, join and disconnect capacitor. MinE-CAP circuit can change class to cooperate to use with high frequency power, save a space with limit ground.

Systematic note

The experience law of adapter of current power supply is, consider a factor when the design low to 90 VAC when, capacitance of dc bus line is worth (with? F is an unit) the choice asks to output power (it is an unit with watt) 1.5 to 2 times. To only tall circuitry application, total electric capacity can be shown reduce. Considering this one crucial concept, minE-CAP makes design personnel to be able to show the size that reduces capacitor of input high capacity. The principle graph position that next graphs indicated to typical MinE-CAP applies.

Graph 1. Typical MinE-CAP applies

CHV is high-pressured capacitor (rated voltage is 400 V) , take total electric capacity normally 20% the left and right sides. CLV is low-pressure capacitor (160V) , 80% what take total electric capacity about. This kind of capacitance is broken up make capacitor bulk decreases be as high as 50% , make adapter size total thereby decrease be as high as 40% .

Graph 2. Of 65 W adapter optimize

In the graph 2 in, the graph is typical 65 W adapter on, need individual 400 V, 100? F capacitor. The space that next graphs showed to in design of identical 65 W adapter use MinE-CAP place comes true is economic. Is cent of total input capacitance capacitor of two 160 V, 47 F and a 400 V, 22? F capacitor. Accordingly, total electric capacity increased actually 16% , at the same time bulk of high capacity capacitor decreased 40% .

Representative application

Design personnel can use existing design and revise capacitor of input high capacity class, in order to reduce the space that input class takes up. This makes they can narrow crust, contrary perhaps, they can add more electric capacity in same case and increase power.

The another design utility of MinE-CAP is the application that power of need peak value transmits. Board carry consultative chip to have two-way communication increasingly with the equipment that charging. These chip normally monitoring and adapter temperature, breakdown and power transmission ability. Design personnel to using this kind of two-way communication to provide nameplate power 1.5 to 2 times. Algorithm was showing these peak value power to shorten charge time. However, inputted large electric capacity to restrict peak value power to transmit ability. MinE-CAP of have the aid of, can use same space to be being shown increase electric capacity of input high capacity. Although be below low-pressure circuitry, this also can lengthen peak value power to transmit.

MinE-CAP ABC

The working principle of MinE-CAP is charge and the voltage of two end of monitoring CLV, input the ability when capacitance to introduce this capacitor in the circuit of low communication circuitry in need only. During MinECAP design is used at the basis to need to communicate cycle in every circuitry, dynamic joint is mixed disconnect CLV. Accordingly, power source can be in whole inside designation input voltage limits move smoothly. To the graph 2 in quotative design, is capacitance of total high capacity of significant small line 116? F, and is capacitance of high capacity of significant tall line 22? F.

When the system is in tall circuitry, minE-CAP measures the difference on CLV to divide voltage through VTOP and VBOT. It adjusts the voltage on CLV, produce line in order to be in or power transmission supports when load rank is jumped.

MinE-CAP is started

On the tradition, the surge electric current that high capacity capacitor enters when starting can affect the reliability of commutator of fuse, bridge-type and capacitor, because this electric current accepts circuit impedance and the restriction that input filter only. As the addition of adapter rated power, surge electric current also can increase, normally need uses NTC thermal resistor to protect fuse and diode bridge. However, NTC thermal resistor reduced integral efficiency of the system, increased heat to input class. Accordingly, normally measure crosses fuse and diode bridge big, and thermal resistor size is too small, in order to restrict its the influence to systematic efficiency.

In MinE-CAP design, the high capacity capacitance of 80% breaks away from application when start. Fall in the low-pressure condition that start (VIN<150 VAC) , minE-CAP carries out pilot to charge actively to CLV. In small line the condition that start falls, undertake charging beforehand to CLV before enabling DC/DC converter in order to support full power capacity very important. MinE-CAP IC is configuration of switch of internal high tension current source, the constant current pulse that offers for CLV charges, refer to a graph please 3. This kind of method allows to undertake charging quickly to CLV, ensure power source prepares power supply to rise from join of initiative communication circuitry, be less than 250 millisecond to be able to fill report. Of CLV this kind controlled charge allow MinE-CAP design to eliminate surge NTC thermal resistor,

Apply to tall circuitry (VIN>150 VAC) , CHV supports full power to transmit alone. MinE-CAP undertakes to CLV slow charge, go to voltage adjustment under capacitor rated voltage. This improved the power supply that cut off the power as a result of circuit and causes to hold time.

Protection is characteristic

Besides outside the algorithm that start, minE-CAP is compositive still a series of protection functions, had included the lukewarm, open circuit that cite a base / short circuit breakdown detects and surge is protected. If malfunction, minE-CAP can disconnect CLV from inside the system. To prevent further systematic damage, minE-CAP brings a foot to convey breakdown information to power changeover class through L. This multipurpose brings a foot to still be used at be below regular job requirement to convey information of voltage of dc bus line to power source controller IC.

Wraparound

The MinE-CAP support of GaN power supply uses rated voltage to be the capacitor of 160V in general input design, and the capacitor that these designs are confined to rated voltage to be 400V normally, the space that saves thereby is equivalent to using the result that place of taller switch frequency achieves. the algorithm that start need not use NTC thermal resistor, and won’t affect eventually user experience. Dc generatrix voltage and breakdown information bring a foot to convey to DC/DC converter through L. MinE-CAP and conjugate of InnoSwitch IC series but limit land increases compositive degree, limit ground is decreased.

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