Single-phase PWM(Pulse Width Modulation) Current Controller Using Mono-Stable Multivibrator

摘要

The subject innovation is to be particularly electric power to the water treatment or air cleaner, pollution-free crop cultures such that a wide range of applications of ozone generator to an apparatus for adjusting the single-phase AC output current by using a monostable multivibrator, which being widely used in digital circuits while it easy to control a constant output current of the inverter for supplying stable and also offers a circuit for implementing a control circuit which ensures a quick controllability. The invention monostable multivibrator time constant for adjusting the pulse width circuit in - so control the input voltage at the (usually resistance Available consists of a capacitor) and optionally adjusting the output pulse width determined by the time constant circuit the pulse width modulated wave ( PWM) to obtain the input of the device, as a method for ever controlling the output current is applied to the thus adjusting the pulse width modulated wave to the gate of the power conversion element such as IGBT (gate insulating bipolar transistor) or a FET (field effect transistor) is the output current reference is been the two signals amplified by the controller becomes the more the actual current value that appears to be of a negative polarity to the other output been input as an input signal of the short time constant of stable multivibrator circuit is composed so as to control the desired current without error. At this time, by adding the voltage-limiting circuit so that the output voltage is no excessive values ​​corresponding to which is the output pulse width modulated wave to the controller characterized by a method for operating a controller in a stable manner.