H Bridge - current allows the high side to be used as...

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H Bridge Louie D. Palencia 20 Febuary 2011 For Lad Holden EET Definition: According to David cook, “An H-bridge is an arrangement of transistors that allows a circuit full control over a standard electric DC motor. That is, with an H-bridge a microcontroller, logic chip, or remote control can electronically command the motor to go forward, reverse, brake, and coast.”   Purpose: The H Bridge, occasionally known as a full bridge, is a circuit used for driving DC motors. The H Bridge gets reference from the look of an “H” when seen in a schematic and for its four switching elements at the corners. The four elements are referred to as: high side left, high side right, low side right, and low side left.   H Bridge circuits can be driven forward and backward by using a completely different power source. H Bridge’s allows you to use sourcing current and sinking current. Sourcing
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Unformatted text preview: current allows the high side to be used as relays that control the positive voltage to the motor. Sinking current is when you connect the circuit to the negative side of the power supply. The low sides of the H Bridge are the relays that control the negative voltage to sink current to the motor. If you are powering a motor you must turn the two switches that are diagonal from each other. You must turn the switches by pairs: either high left and lower right, or lower left and high right, but never both switches on the same side. You will short the circuit if you both switches on one side are turned on. They call this Switch-Mode Power Supply (SMPS). That is what I have learned from H Bridges. The current flow is positive if your turn on the High Side left and Low Side right. The current will flow negative if the opposite switches are turned on....
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