H-Bridge four quadrant Dc motor driver
H-Bridge four quadrant Dc motor driver
(OP)
I would like to know if all H-Bridge four quadrant Dc motor driver can regenerate power in braking quadrant.
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H-Bridge four quadrant Dc motor driver
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H-Bridge four quadrant Dc motor driverH-Bridge four quadrant Dc motor driver(OP)
I would like to know if all H-Bridge four quadrant Dc motor driver can regenerate power in braking quadrant.
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RE: H-Bridge four quadrant Dc motor driver
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: H-Bridge four quadrant Dc motor driver
Skogs' warning about making sure you can handle the regenerated power is very important. The first place the power goes is to charge up the DC bus capacitors, increasing the bus voltage. If this has ANY possibility of increasing the voltage past safe limits, you must then be able to remove power from the capacitor bank by one of the methods he suggests.
RE: H-Bridge four quadrant Dc motor driver
RE: H-Bridge four quadrant Dc motor driver
RE: H-Bridge four quadrant Dc motor driver
Also, I would like to know in regenerative braking in hybrid and electrical vehicle. How they control the braking and charge the battery? I think that the vehicle kinetic will drive the motor in braking quadrant and generate back emf. This back emf will charge the battery, but how they control the braking level? and Is controlling the braking level will affect the regenerative energy?
RE: H-Bridge four quadrant Dc motor driver
In eVehicles, depending on the battery bank capacity some or all the charge from dynamic braking can be returned to the bank. However in non-eVehicles like Prius's since the bank is not as large as it would be if the car was a pure electric, the battery bank can sometimes not accept the full dynamic braking energy. I believe Prius's use a capacitor bank to take sudden large energy returns.
On a Prius they watch the 'gas pedal' and the brake pedal and control the dynamic braking in a way that won't surprise or confuse soccer-moms.
Keith Cress
kcress - http://www.flaminsystems.com
RE: H-Bridge four quadrant Dc motor driver
In normal drive mode, if the battery can't take more charge the ECM starts using the mechanical brakes. There is no need to do anything fancy in that case, the brakes just revert to brakes like every other car has.
If the "brake" or "low" (depends on brand) mode is selected, then when the battery can't take charge, the engine will be used for compression braking. Again, this is just like any other vehicle - other than the electronic transmission being used to spin up the engine.
RE: H-Bridge four quadrant Dc motor driver
I have another question related to the attached photo. Does the attached 4-quadrant means that we can only regenerate energy in the regeneration space and if the torque and speed more than certain limits I couldn't regenerate energy and I need to apply more voltage than the back emf. If so, why they called this area the dynamic braking as I know the dynamic braking is done by using external resistor between the motor terminals, but in this case there is no resistor between the motor terminals why they called it dynamic braking.