[introduction] the foundation that power source is electronic equipment, among them grid driver is the key that stability provides facility power source. Grid driver is amplifier of a kind of power, it accepts the low power input that comes from controller chip, it is high power transistor (for example IGBT or power MOSFET) input of drive of grid generation tall electric current. The article will introduce the technical idea of grid drive power source and DC-DC converter for you, and the keeps apart range of products of grid drive power source function that rolls out by Murata is characteristic.

Power source is the foundation of electronic equipment, among them grid driver is the key that stability provides facility power source. Grid driver is amplifier of a kind of power, it accepts the low power input that comes from controller chip, it is high power transistor (for example IGBT or power MOSFET) input of drive of grid generation tall electric current. The article will introduce the technical idea of grid drive power source and DC-DC converter for you, and the keeps apart range of products of grid drive power source function that rolls out by Murata is characteristic.

Grid driver is the foundation of electric power change-over circuit

Grid driver is one kind is used at switch of drive power semiconductor (wait like MOSFET, IGBT) circuit. These semiconductor switch are used at controlling the switch state of electric power converter, shed best friend to shed inverter continuously for example (DC-AC Inverter) , communication comes to shed converter continuously (AC-DC Converter) , dc comes to shed converter continuously (DC-DC Converter) etc.

The main effect of grid driver is to offer enough electricity and voltage, in order to dominate the switch speed of power semiconductor switch and switch time, ensure the stability of converter moves thereby. Grid driver includes to input the part such as circuit of level of power of drive circuit, output, segregation commonly, can keep apart control signal and power circuit, in order to raise systematic security and dependability.

In the design of grid driver, the element such as noise of the character that need considers to output semiconductor of power, power, power source. Grid driver still can use different control method, for example voltage control and voltaic control, in order to realize diverse applied demand.

The sort of grid driver is quite diversiform, it is OK and onefold chip or the means that regard schism as module are run. Substantially, grid driver is comprised by n converter and amplifier, grid driver chip uses as control signal (number or imitate controller) with power switch (IGBT, MOSFET, SiC MOSFET and GaN HEMT) the interface between. Solution of driver of compositive type grid can reduce list of time of design complexity, development, material (BOM) and circuit board space, the dependability of the grid driver solution that improves schism type to carry out at the same time.

Converter of segregation type DC-DC enhances systematic security

It is in order to be used at the DC-DC application setting of grid drive power source exemple, typical application is be complete bridge electric machinery ” High Side Gao Bian ” and ” Low Side low margin ” provide drive power source, it can be the mode such as half bridge, complete bridge, three-phase, blasting off in Gao Bian’s switch is node of a high pressure, high frequency switch extremely, can be IGBT, also may be MOSFET, SiC, GaN, it needs + Ve and – of Ve losing two-way to output voltage, the drive in Gao Bian and relevant circuit must use segregation to design.

DC-DC provides average dc electricity to driver circuit only, provide peak value electricity by the capacitance of close drive circuit, use at every cycle to undertake charge and discharging to grid capacitance, when use need considers to fall the other loss in the forehead and drive, among them the Qg of SiC and GaN under IGBT, but frequency may be very tall.

According to data table, most parts of an apparatus can be shut with 0V, but still must use negative grid tension sometimes, this is to overcome parasitism inductance effect and Miller (Miller) capacitance effect. As a result of the existence of inductance of source pole parasitism, when IGBT is shut, will bring about electric current to stop electric inductive tension suddenly, create aiguille and grid tension retrorse, on the other hand, during closing, collector voltage will rise quickly, bring about voltaic aiguille to strap capacitance to flow to grid through rice, this meeting brings about grid contrary positive electricity appears to press on resistor.

That why does DC-DC converter need to undertake keeping apart again? What consider above all is safe element, DC-DC can be the one part of safe segregation system, for example according to UL60950, 690 VAC system is contented strengthen insulation, need 14mm climbs electric distance and air space, use get much individual instant voltage to come greatly than working voltage segregation of test and verify, if add,hold a minute. In addition, segregation also has the need of functional sex, resembling is to be in ” Gao Bian ” in application, DC-DC input can see tension of complete HVDC link to output lieutenant general with PWM frequency successive switch, below this kind of circumstance, it is individual instant voltage of a minute only the test is not good segregation target, the partial discharge test that accords with IEC 60270 just is maintain pattern effectively really.

Can producing discharge is the puncture voltage because of little space (~3kV/mm) , far under all round the puncture voltage of solid dielectric (~300kV/mm) , this ” initiative voltage ” can be measured, use at defining voltage of the biggest job in order to ensure the long-term reliability of dielectric. Partial discharge is short-term won’t cause great damage, but use for long, partial discharge phenomenon can reduce insulation property.

High margin switch blasts off is node of a high pressure, high frequency switch extremely, input output to be able to see tension of complete HVDC link from DC-DC, with PWM frequency successive switch, its frequency may be very tall, metabolic rate is very high also, resembling is IGBT can be achieved make an appointment with 30kV/ μ S, MOSFET has 50kV/ μ S about, siC/GaN has 50+++Kv/ μ S about, DCDC input outputs capacitive reactance of coupling of segregation general existence (Cc) , two end have this electric capacity tall switch voltage, because this will have pulse electric current had flowed, this may bring a foot to cause interference to sensitive input, accordingly in all immunity to interference of modular transient state (CMTI) test general can give out the directive of this breakdown level.

Can realize the DC-DC converter of ambipolar voltage

Murata rolled out much money to be used at the DC-DC converter series of grid drive power source, this is design for grid drive circuit only, use at replacing the sources of energy, motion and control, mobile sex and Medical Protection solution normally. These product segregation electric capacity are very small, have 3pF only, can be used at IGBT/SiC and MOS grid driver optimize ambipolar output voltage, DC Link voltage has what can amount to 3KV to be able to bear or endure get ability, and own peculiar partial discharge property, the Dv/dt immunity to interference when 1.6kV can amount to 80kV/ μ S, whole set includes to support the much money product line of IGBT, SiC, MOS, GaN.

All sorts of switch parts of an apparatus need different grid voltage, the n that different manufacturer appoints also is put in difference, murata implements the different method of ambipolar voltage, it is to use resembling is converter of MGJ2 SIP DC-DC, its always output power to be 2W, the double winding method of use tradition will offer + Ve and – output of Ve grid driving voltage, include to support + 15V/-15V, + 15V/-5V, + 15V/-8.7V, + 20V/-5V and + 18V/-2.5V, can circle through the change number will offer other and special output.

Resembling additionally is MGJ3 and MGJ6 DC-DC converter, can provide the total output power of 3W and 6W, use patent technology, can output 3 voltage to undertake agile configuration, resembling is 20V/-5V (15V+5V, – 5V) with 15V/-10V (15V, – 5V-5V) . The total output power of MGJ1 and MGJ2 SMD is 1W and 2W, its use diode of in-house Qi Na cent pressing is offerred specific + Ve and – Ve grid driving voltage, include + 15V/-5V (from onefold 20V is outputted) , + 15V/-9V (from onefold 24V is outputted) with + 19V/-5V (from onefold 24V is outputted) , through changing neat accept diode to still can offer other and special output.

Support the DC-DC converter of GaN parts of an apparatus

GaN parts of an apparatus has made the good product that current high power uses, murata also is aimed at application of GaN grid drive, roll out the new-style DC-DC converter that the course optimizes, murata uses proprietary PCB electric attack with mechanical design develop, rolled out a series of new compact model DC-DC converter, these converter and increasingly all-pervading broadband unoccupied place technology keeps consistent. Brand-new MGN1 series 1W outputs DC-DC converter, aim to offer the voltage that driver of grid of GaN parts of an apparatus needs.

These parts of an apparatus are offerred thin model, cover an area of the surface with small area to stick hold a solution, OK and relaxed compositive suffer to the space in bounds system. They still have the advantage of small amount, this open up greater deploy opportunity, offerred output voltage is + 8V, + 12V and + 6/-3V.

One of crucial attribute of converter of MGN1 series DC-DC are his segregation electric capacity is very small, have 2.5pF only (typical cost) . Come so, the transient state coupling on segregation power base decreases considerably, prevent signal thereby lack fidelity. In addition, it is OK that this is meant problem of EMI of slow down system. Of these unit > the taller switch speed that 200kV/ μ S CMTI makes its suit to be based on GaN system very much, ensure further integrality of grid driver signal. Profit from function of its partial discharge, can keep reliable below high-pressured condition move.

The base of successive segregation power of the 1.1kV of DC-DC converter support in the MGN1 series of Murata withstand voltage, be isolated from basically to enhance insulation with 240VAC in the light of 650VDC, in order to accord with UL62368 standard. These converter have the distance climbing report of 6.5mm and clearance data, can be in – 40 ℃ come + run inside the working temperature limits of 105 ℃ , make its can be installed in having the environment that challenges a gender very much. In addition, still combined reversal sex and mechanism of short circuit protection.

Converter of this new-style DC-DC can be used at a variety of application that are based on GaN, what include electric car among them is fast charge electrified wire netting of converter of memory of infrastructure, batteries, intelligence is carried out, breaker of switch of solar energy inverter, solid state, ICT and data center, wind- driven turbine and electric machinery driver.

Epilogue

In all sorts of electric power transition, grid driver is acting important role, and the converter of segregation type DC-DC that carry grid drive power supply and supports ambipolar voltage output, it is the good alternative that offers stabilized power supply for all sorts of wiring more. Murata was rolled out a series of converter of segregation type DC-DC, offer the range of products of the different technique such as supportive IGBT, MOSFET, SiC MOSFET and GaN, can satisfy the different power requirement of all sorts of application, range of products is quite complete, will be you when undertaking the product is developed go up beautiful partner.

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