speed control of 12v dc motor( four quadrant)

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lignin

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I want to control the speed of 12v brushed dc motor(four quadrant). I think ı have to use the pwm but ı cant understand the four quadrant operation.what is four quadrant operation and how can ı do it ?
 

By using a H-bridge and a suitable PWM scheme (synchronous 2-level or 3-level switching), four quadrant operation will be achieved "automatically". In simple terms it means, that you are generating a variable bipolar voltage that can both source and sink current.
 
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    tpetar

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thanks for your help.
can ı use the pulse width modulated inverters for dc motor speed control ?
 

Yes, but as brushed motors are very noisy, make sure that free wheeling diodes are fitted across (or in) the output transistors and capacitors across the motor.
Frank

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Yes, but as brushed motors are very noisy, make sure that free wheeling diodes are fitted across (or in) the output transistors and capacitors across the motor.
Frank
 

ı search in the internet and ı found this circuit. is it suitable for my aim ?
 

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