EE362L, Fall 2006 Isolated Firing Circuit for H-Bridge Inverteree362l,2006秋季隔离全桥逆变触发电路.ppt
《EE362L, Fall 2006 Isolated Firing Circuit for H-Bridge Inverteree362l,2006秋季隔离全桥逆变触发电路.ppt》由会员分享,可在线阅读,更多相关《EE362L, Fall 2006 Isolated Firing Circuit for H-Bridge Inverteree362l,2006秋季隔离全桥逆变触发电路.ppt(22页珍藏版)》请在三一文库上搜索。
1、1,EE462L, Spring 2013 Isolated Firing Circuit for H-Bridge Inverter (partially pre-Fall 2009 approach),2,Isolation is needed because we have three separate MOSFET source nodes, and these three nodes are ground references for the respective firing circuits,One logic signal toggles A+,A,One logic sign
2、al toggles B+,B,Vdc,(source of power delivered to load),Load,A,+,B,+,A,B,Local ground,reference for A,+,firing circuit,Local ground,reference for,B,+,firing circuit,Local ground,reference for,B,firing circuit,Local ground,reference for A,firing circuit,S,S,S,S,3,8 5,Comp,1 4,270k,Vtri,Vcont,Vcont,27
3、0k,1k,1.5k,1.5k,12V from DC-DC chip,+12V from DC-DC chip,Common (0V) from DC-DC chip,Output of the Comparator Chip,Since the comparator compares signals that can be either positive or negative, the comparator must be powered by V supply,4,8 5,Comp,1 4,270k,Vtri,Vcont,Vcont,270k,1k,1.5k,1.5k,12V from
4、 DC-DC chip,+12V from DC-DC chip,Common (0V) from DC-DC chip,Output of the Comparator Chip,Since the comparator compares signals that can be either positive or negative, the comparator must be powered by V supply,5,V(A+,A) control signal,V(B+,B) control signal,Reference (is 12V from DC-DC chip),The
5、control signals at the open-circuited output of the PWM control circuit are +24V, or 0V,When V(A+,A) is 24V, MOSFET A+ is on, MOSFET A is off When V(A+,A) is 0V, MOSFET A+ is off, MOSFET A is on,MOSFETs B+ and B work the same way with V(B+,B),6,Look for symmetry of pulse centers,Look for symmetry of
6、 pulse centers,7,O,ne,firing,circuit for each,MOSFET, with each firing,circuit mounted on a separate protoboard,.,Protoboards,A,and B,can share a power supply,and ground,. A,+,and,B,+,must each use separate power supplies,and,grounds,.,Do not connect any of these grounds to the,ground of the control
7、 circuit.,O,+,O,(,see Figure 2 for connections,),Powered by,+,12V that is,isolated,from,the,PWM,control circuit,10k,0.1F,10,1,.,2,k,MOSFET,G D S,100k,5,4,Opto,8,1,5 4,Dri,ver,8 1,Outl,ine of,protoboard,A,+,and B,+,use inverting drivers,(1426s),. A,and B,use non,-,inverting d,rivers,(1427s),. The,opt
8、ocouplers provide an additional,inversion.,g,reen,g,reen,g,reen,blue for A,+,B,+,violet for A,B,blue,blue,red,blue,Grounds,(,isolated,from control circuit,),Wait until,next week,Switching diode,14mA,Optocoupler is current-controlled. Gate current turns on the transistor, which pulls down the collect
9、or voltage.,Isolating barrier,Once the MOSFET is connected, this asymmetrical circuit will add blanking by making the turn-on slower than the turn-off. (blanking is the opposite of overlap),Overlap is the time that A+ and A are simultaneously “on,” which should be avoided. Hence, some blanking (time
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- EE362L Fall 2006 Isolated Firing Circuit for H-Bridge Inverteree362l,2006秋季隔离全桥逆变触发电路 EE362L Bridge
链接地址:https://www.31doc.com/p-3523945.html