Fan system and brake control circuit thereof

A fan system, comprising:

• a motor with a coil module having a first connection terminal and a second connection terminal;
• a storage unit electrically coupling with a voltage source, storing electrical energy when the voltage source is available, and releasing the stored electrical energy to carry out a brake operation when the voltage source is unavailable;
• a driver electrically coupling with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module;
• and
• a buffer circuit electrically coupling with the coil module, wherein the buffer circuit comprises a buffer element and an actuating member in series connection with the buffer element, with a combination circuit of the buffer element and the actuating member coupling with the coil module in parallel connection,
• wherein, in the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical energy of the inductor current, for gradually stopping the motor in a buffering time period.

A fan system, comprising:

• a motor with a coil module having a first connection terminal and a second connection terminal;
• a storage unit electrically coupling with a voltage source, storing electrical energy when the voltage source is available, and releasing the stored electrical energy to carry out a brake operation when the voltage source is unavailable;
• a driver electrically coupling with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module, wherein the driver is a full bridge driver having an upper switch module and a lower switch module, with each of the upper and lower switch modules being constructed by two electronic power switches;
• a buffer circuit electrically coupling with the coil module, wherein the buffer circuit comprises a buffer element and an actuating member in series connection with the buffer element, with a combination circuit of the buffer element and the actuating member coupling between the first connection terminal of the coil module and the storage unit;
• and
• a control unit electrically coupling with the driver;
• wherein, in the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical enemy of the inductor current, for gradually stopping the motor in a buffering time period.

A fan system, comprising:

• a motor with a coil module having a first connection terminal and a second connection terminal;
• a storage unit electrically coupling with a voltage source, storing electrical energy when the voltage source is available, and releasing the stored electrical energy to carry out a brake operation when the voltage source is unavailable;
• a driver electrically coupling with the first and second connection terminals of the coil module to control a direction of an inductor current passing through the coil module, wherein the driver is a full bridge driver having an upper switch module and a lower switch module, with each of the upper and lower switch modules being constructed by two electronic power switches;
• a buffer circuit electrically coupling with the coil module, wherein the buffer circuit comprises a buffer element, an actuating member, a first power state sensing switch, and a second power state sensing switch, with the buffer element serially connecting with the actuating member, with a combination circuit of the buffer element and the actuating member coupling between the first connection terminal of the coil module and the ground, with the first power state sensing switch electrically coupling with the actuating member, and with the second power state sensing switch electrically coupling with one of the two electronic power switches of the lower switch module;
• and
• a control unit electrically coupling with the driver and the buffer circuit;
• wherein, in the brake operation, the buffer circuit operates to form a transient potential between the first and second connection terminals of the coil module and to consume electrical energy of the inductor current, for gradually stopping the motor in a buffering time period.