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Bridges - Half, Full, Three Phase
For the EMC2 context, a bridge is two or more of the same circuit bridged by a connection, usually for the purpose of controlling a high power load. The h-bridge is the prototype from which the half-bridge and three-phase bridge are derived. This page should contain plans, schematics and other information that can help readers to understand and appreciate how bridges work, what they can do and provide examples of what would be appropriate for a CNC application. In higher power applications the power elements can tend to switch themselves on, be hard to turn off, and/or input timing can become critical. Bridge control chips have been developed to address these problems and should also be covered here.
The most common EMC2 application of a bridge, would be a pair of h-bridges driving the pair of coils in a stepper motor in bipolar mode. Also common is an h-bridge with a PWM input signal and PWM power output driven in forward, reverse, brake, or coast through a brushed motor. Increasingly more common is a three phase bridge to drive brushless motors for axes and spindles (such as with VFD's).
(The L298 found elsewhere in this wiki should be considered part of the bridge category. Some controllers have bridges included as part of the assembly, so more insight may be found in consulting those sources.)
BLDC IR2130 for review (not tested!!!)
BLDC BUZ11 for review (not tested!!!)
PMSM Inverter for review (not tested!!!)
DC Motor with SI9978
small DC Motor with SI9978 (for review, untested)