1. 功能:電機是單向還是雙向轉動?需不需要調速?對于單向的電機驅動,只要用一個大功率三極管或場效應管或繼電器直接帶動電機

1 function: motor is one-way or two-way rotation? Need not speed regulation? For one-way motor drive, as long as the use of a large power transistor or FET or relay directly drive the

motor

即可,當電機需要雙向轉動時,可以使用由4 個功率元件組成的H 橋電路或者使用一個雙刀雙擲的繼電器。如果不需要調速,只要使

The utility model can be used for the bidirectional rotation of the motor, and the H bridge circuit composed of 4 power components can be used or a double pole double throw relay is

used. If you do not need speed, as long as

用繼電器即可;但如果需要調速,可以使用三極管,場效應管等開關元件實現PWM(脈沖寬度調制)調速。

With the relay can be; but if you need to speed, you can use the transistor, FET and other switching elements to achieve PWM (pulse width modulation) speed.

2. 性能:對于PWM 調速的電機驅動電路,主要有以下性能指標。

2 Performance: for PWM speed motor drive circuit, the main performance indicators.

1)輸出電流和電壓范圍,它決定著電路能驅動多大功率的電機。

1) the output current and voltage range, which determines how much power the circuit can drive the motor.

2)效率,高的效率不僅意味著節省電源,也會減少驅動電路的發熱。要提高電路的效率,可以從保證功率器件的開關工作狀態和防

2 efficiency, high efficiency means not only to save power, but also reduce the drive circuit heating. In order to improve the efficiency of the circuit, it is possible to ensure the switching

state and the protection of the power device

止共態導通(H 橋或推挽電路可能出現的一個問題,即兩個功率器件同時導通使電源短路)入手。

Check common conduction (a problem, H bridge or push-pull circuit may appear the two power devices simultaneously conducting the power of short circuit).

3)對控制輸入端的影響。功率電路對其輸入端應有良好的信號隔離,防止有高電壓大電流進入主控電路,這可以用高的輸入阻抗或

3) effect on control input. The power circuit should have good signal isolation to prevent the high voltage and high current from entering the main control circuit

光電耦合器實現隔離。

Optocoupler isolation.

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