Motor controlling circuit with controllable driven current supply

【Technical field】 [0001] The present invention relates to a motor control circuit, in particular to a control circuit for supplying a controllable driving current to a motor. 【Background technique】 [0002] Generally speaking, an H-bridge circuit composed of four switching transistors can be applied to provide driving current to motors, such as DC motors, stepping motors, and voice coil motors, etc., so as to control the rotation direction, speed, and and other operating characteristics. [0003] figure 1 A circuit diagram of a prior art H-bridge circuit 10 for driving a motor M is shown. refer to figure 1 , the motor M is coupled to the supply voltage source V via the H-bridge circuit 10 m and ground potential. Although the motor M is actually a complex system composed of many mechanical and electrical components, the driving current is basically applied to the coils in the motor M to generate a magnetic field. Therefore, the word "motor" in the following mainly refer...