H-bridge motor speed control tutorial

00:00 / 00:00 Normal 4 times speed 2 times speed 1.5 times 1.25 times normal 0.5 times normal load error The H bridge is an electronic circuit that allows both the load or output end of the load or the output of both ends / current inversely. Such circuitry can be used for the transfluent control and speed control of DC motors in robots and other actual applications, and the stepping motor control (bipolar step motor must also include two H-bridge motor controllers), power conversion Most DC-AC converters (such as inverters and inverters), partial DC-DC converters (push-pull converters), etc., and other power electronic devices. The H-bridge is a typical DC motor control circuit because its circuit shape is like a letter H, so the name and "H Bridge". 4 triodes consisting of 4 vertical legs, while the motor is the horizontal bar in H. The H-bridge circuit can be set up in the form of a component or can be integrated into the integrated circuit. The name of the "H Bridge" originated from its circuit, two parallel branches and a load access / circuit output branch, which appeared to form a circuit structure such as "H" letters. The working principle switch T1, T4 closed, T2, T3 are broken as shown below: U0 = UD; switch T1, T4 is broken, T2, T3 closed: u0 = - ud; when frequency fs When alternately switches the switches T1, T1, T2, T3, the alternating voltage waveform (positive alternating square wave) is obtained on the load resistor R, and the period TS = 1 / fs, so that the DC voltage E becomes. AC voltage UO. UO contains harmonics, if you want to get a sine wave voltage, you can get it through filter filtering. Main circuit switches T1 to T4, which are actually an ideal model of various semiconductor switching devices. The switching devices commonly used in the inverter circuit include a fast thyristor, a thyristor (GTO), a power transistor (GTR), a power field effect transistor (MOSFET), an insulated gate transistor (IGBT). The following video details the tutorial of the H-bridge motor speed control. Read more

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