In power supply design, a bridge circuit or bridge rectifier is an arrangement of diodes or similar devices used to rectify an electric current, i . e . to convert it from an unknown or alternating polarity to a direct current of known polarity.
22.
The voltage for the motor is derived from a " tap " on the heating resistor ( with the voltage divider ratio set to produce, say, 12 VAC . This voltage is then fed through a bridge rectifier and thence to the DC motor.
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Having taken apart two different makes of electric lawnmower over the weekend, 110 volt plugin not rechargable; both are DC with a big bridge rectifier mounted on the motor . why in the world ? talk ) 20 : 41, 14 July 2008 ( UTC)
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That, combined with the fact that a diode bridge rectifier is now a very inexpensive component has meant that a many designs that would, in the past, have used a " universal motor " now just use a straight permanent-magnet dc motor design . commutator with electronics.
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However, for a given desired ripple, the value of both capacitors must be twice the value of the single one required for a normal bridge rectifier; when the switch is closed each one must filter the output of a half-wave rectifier, and when the switch is open the two capacitors are connected in series with an equivalent value of half one of them.
