As always with me yes and no. I understand the use of a bidirectional buck boost inverter for varies battery types or supercap usage. However, I need more info on the switching of the H-Bridge during regen. An AC inverter has 6 IGBTs is H-bridge configurations. Two IGBTs are assigned for each motor phase (upper and lower IGBT). The upper IGBT is never switched on when the lower IGBT is energized and vise versa. A dead time is included between switching. By switching the 6 IGBTs in a certain sequence, the 3 phase voltages are created. I understand all this. What I do not understand is the switching sequence that occurs during regen. In addition, as the vehicle slows down, the motor acting as a generator outputs a decreasing voltage because the RPMs are decreasing. The motor/generator is outputting a decreasing 3 phase voltage. If the voltage is less than the DC voltage of the battery, there is no potential to charge the battery. How do you get the AC converter to DC to charge the batter?
________________________________ From: EV <[email protected]> on behalf of Cor van de Water via EV <[email protected]> Sent: Monday, January 2, 2017 4:43 PM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Regen on AC Inverter Robert, An AC motor is by definition a motor that needs 3-phase (or more) AC power. The direction of power (acceleration or braking) is only determined by the phase (direction) of the current. So, an AC controller will always automatically include the ability to do regen. The requirement for example with the Toyota Prius from MY 2004 onward to use a bi-directional boost converter is because the engineers wanted to use a 200V battery as well as have 500V at the inverter to increase power and speed over the 300V that was the battery voltage of the 2001-2003 Prius. Hope this clarifies, Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com Proxim - Wireless Broadband, Backhaul Solutions and Access ...<http://www.proxim.com/> www.proxim.com Proxim Wireless offers licensed and unlicensed point to point, backhaul, bridge, point to multipoint, wireless broadband and wireless access points. This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of ROBERT via EV Sent: Monday, January 02, 2017 3:10 PM To: [email protected] Subject: [EVDL] Regen on AC Inverter In order to accomplish regen with an AC inverter on an all electric vehicle are the IGBTs modulated or is a buck boost circuit added to the inverter? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170102/5e29 7b37/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170103/d55686d5/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
