放电电阻通常和电容器并联.
在电源波动时,电容器会随之充放电.如不并联放电电阻,充放电电流从电容器一端出发经工作回路回到电容器的另一端,严重干扰电路稳定工作. 并联放电电阻,充放电电流从电阻流过,可避免上述弊端.
当变频器带动的电机或其他感性负载在停机的时候，一般都是采用能耗制动的方式来实现的，就是把停止后电机的动能和线圈里面的磁能都通过一个别的耗能元件消耗掉,从而实现快速停车。当供电停止后，变频器的逆变电路就反向导通，把这些剩余电能反馈到变频器的直流母线上来，直流母线上的电压会因此而升高，当升高到一定值的时候，变频器的制动电阻就投入运行，使这部分电能通过电阻发热的方式消耗掉，同时维持直流母线上的电压为一个正常值
Discharge resistor is the resistor used to discharge The discharge resistor is usually in parallel with the capacitor. When the power supply fluctuates, the capacitor will be charged and discharged. If the discharge resistor is not connected in parallel, the charge and discharge current will return from the end of the capacitor to the other end of the capacitor through the working circuit, which seriously interferes with the stable operation of the circuit. Parallel discharge resistor, charge and discharge current from the resistor Flow through, can avoid the above drawbacks. When the motor or other inductive load driven by the inverter is stopped, it is generally realized by means of energy consumption braking, that is, the kinetic energy of the motor after stopping and the magnetic energy inside the coil are consumed by another energy consuming component. Drop to achieve fast parking. When the power supply stops, the inverter's inverter circuit reverses the conduction, and the residual power is fed back to the DC bus of the inverter. The voltage on the DC bus will rise accordingly. When it rises to a certain value, the frequency conversion The braking resistor of the device is put into operation, so that this part of the electric energy is consumed by the resistance heating, while maintaining the voltage on the DC busbar as a normal value.
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