Use the H-bridge circuit to drive the program introduction of the brush DC motor

From this article, we will introduce several methods that use the H-bridge circuit to drive the brush DC motor. H-bridge circuit has a brush DC motor drive: High-side voltage linear control In the driver circuit example of the brush DC motor drive, the H voltage of the OUT pin can be changed by linearly controlling the high side PCH MOSFET, thereby controlling the voltage applied to the motor. The H voltage of the OUT pin is controlled by the DC voltage applied to the VREF pin, theoretically the same voltage as the voltage applied to the VREF. This can control the speed / torque of the motor. In this example, when the high side MOSFET (Q1, Q3) is turned on by the H-bridge switching control logic, the operational amplifier is biased to the gate of the high side MOSFET, and the MOSFET is turned on, and the drain voltage of the MOSFET isyed. To the same phase input of the operational amplifier. Depending on the principle of the operational amplifier feedback circuit, the circuit performs feedback control to enable the inverting input and the same phase input to have the same voltage. In this example, the voltage applied to the VREF pin = the inverted pin voltage of the operational amplifier is equal to the H voltage of the drain voltage = OUT pin in the operational amplifier = MOSFET. Since the gain of the feedback circuit is +1, the voltage ratio of VREF and OUT is also 1: 1. It may be a bit uncoordinated for circuitry that feeds back to the same-in-line pin, but since the PCH MOSFET is L active L, the reverse voltage output will be fed back to the operational amplifier output. This is the same as the thinking of the feedback circuit using the PNP transistor as a boost. The work of a brush DC motor driven H-bridge control circuit is the same as described in the "switching of the output state". Key points: • When a brush DC motor is driven, the circuit structure of the high side voltage of the H-bridge circuit can be linearly controlled. · When a brush DC motor is driven, the motor speed / torque can be linearly controlled by controlling the H voltage of the OUT pin. Edit: hfy, read full text

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