Without brush module of electric machinery IPM to exist what problem? Will IC of efficient inverter drive replace?
[introduction] without brush electric machinery (BLDC) can effect is taller, dynamic performance is more excellent with moving noise lower, already made the inevitable trend that electric machinery drive designs, but meanwhile, existence of module of IPM of high-pressured electric machinery comes loose a lot of problems such as heat, need uses new inverter drive IC to undertake replacing. Without because world each country pays close attention to energy-saving problem ceaselessly,brush market of tremendous increment of electric machinery —— , ambassadorial can model the demand that consumes kind of product rises continuously, especially the product of white home appliance such as freezer, washing machine and air conditioning.
Besides energy-saving, the challenge that white home appliance designs includes measure, medicinal powder hot, dependability, noise and exterior design. And these with be closely bound up of electric machinery technology, the firm of well-known company Power Integrations that at high-pressured integrated circuit high-energy effect power source changes a field releases deep ploughing BridgeSwitch™ is compositive half bridge circuit (the electric machinery driver of IHB) IC range of products. BridgeSwitch IC interior is compositive the FREDFET that two individual character can strengthen (have fast the field effect transistor that restores extension diode) use Yu Banqiao circuit respectively go up to be in charge of and leave a valve, and the electricity that has nondestructive waste time detects function, can make of 300 W less than without brush dc (the inverter changeover efficiency in application of driver of BLDC) electric machinery is achieved 98.5% .
The exceedingly good efficiency that IHB driver provides and distributed medicinal powder hot method but leave out carbon fin, conduce to reduce systematic cost and weight. Because have electric current of compositive nondestructive bad news to detect, bus line voltage detects and systematic level is too lukewarm detect wait for character, because series of this this parts of an apparatus suits home appliance very much,drive of medium BLDC electric machinery applies. BridgeSwitch parts of an apparatus suits freezer compressor, warm a fan of air conditioning system and other housekeeping money and light-duty business use machine of zephyr of pump, fan.
The circuit of drive of half bridge electric machinery of PI is special apply to electric machinery of dc of 30-300W of electric home appliances<gj to apply, its intelligence is efficient, buy hardware circuit is protected inside, can save periphery circuit cost considerably. Driver of this half bridge can replace traditional IPM module, can more surely drive electric machinery is laden, because its are efficient,also reach distributed medicinal powder hot means, can accomplish thereby need not the design of electric machinery drive of carbon fin. From chip interior the structure is told, this driver has power of self-confessed electric energy, consequently can need not exterior power source provides drive power supply, and every half bridge all can undertake exterior circuit is configured, undertake according to need corresponding protection is configured. IC of drive of this half bridge has 4 marked characteristics:
● drive efficiency is tall, come true need not the design of carbon fin
● intelligence is changed, have protection of perfect hardware breakdown and breakdown report function
● chip is compositive degree tall, reduce periphery parts of an apparatus, save cost
● suits any type electric machinery and control algorithm application
The 600 V FREDFET that uses in BridgeSwitch IC is compositive exceed quickly soft restore body diode. This conduces to reduce switch loss and the generation that reduce noise considerably, simplify thereby design of systematic level EMC. This new maximum pressure from power supply IC still has drive of half bridge electric machinery inside the protection of parts of an apparatus of buy and system monitor character, what have a reliable single-track interface in order to to have working state at the same time is newer, mix in electric machinery microprocessor amount to 3 BridgeSwitch communication has between parts of an apparatus.
Of every BridgeSwitch parts of an apparatus it is OK to go up to be in charge of and issue tubal current limliting to nod have set alone, such need not the protection that microprocessor and relevant periphery circuit provide whole system below open a way of electric machinery winding or short circuit circumstance. Electric current of compositive nondestructive bad news monitors character to be able to offer the electric machinery breakdown that is based on hardware to protect, conduce to simplify electric machinery breakdown protects a mechanism, satisfy IEC60335-1 and IEC60730-1 requirement thereby.
Cristian Ionescu-Catrina of manager of advanced product sale expresses: We examined “ afresh the challenge that the BLDC city place of swift and violent growth faces, and the increasingly rigid energy-saving standard inside global limits and code, rolled out then can realize the sources of energy and space to save already, can cut the innovation solution of BOM again. New plan can accord with safe level easily not only, still can simplify circuit and shorten development time. ”
The other character of new parts of an apparatus or appliance includes to be as high as the PWM job frequency of 20 KHz, early childhood to leak for mirrorring FREDFET of accurate, real time at the same time extremely the small signal output of voltaic size, of its amplitude and electric machinery winding concerning into the mirror to electric current. Its safety character includes two class parts of an apparatus or appliance too lukewarm detect, next canals and on the canal chases periodic electric current to current limliting and dc bus line are pressed too and be owed suppress protection and report. New parts of an apparatus or appliance but compatible and all common control is algorithmic–Magnetic field is directional control (control of FOC) , sine and offer sensor and the echelon that detect without sensor control algorithm, about these 3 kinds control mode refers to reference to design DER-654, DER-653 and DER-749 please. BridgeSwitch is used thin model the surface sticks the InSOP-24C that fit pattern to enclose, its climb electric distance to be more than 3.2 Mm, can pass two naked solder dish implementation uses PCB to undertake coming loose heating up.
The example that PI provides can get used to any BLDC electric machinery to control algorithm, can cooperate collect of mainstream MCU instruction, fit echelon wave, sine wave and FOC control pattern.
Half bridge of BridgeSwitch drive IC makes the home appliance application that has electric machinery more satisfy energy-saving standard easily, character of its reliable at the same time hardware means protection and breakdown report mechanism make the dependability of electric machinery application rises greatly.