The main circuit is the power conversion part that supplies the voltage regulation and frequency modulation power supply to the asynchronous motor, and the main circuit of the inverter can be roughly divided into two categories: the voltage type is the inverter that converts the DC of the voltage source into a communication inverter, and the filter of the DC loop is the capacitor. The current type is an inverter that converts the DC of the current source into communication, and its DC loop filter is an inductance. It consists of three parts: a "rectifier" that converts the power supply into DC power, a "flat wave circuit" that absorbs the voltage ripples generated by the converter and inverter, and an "inverter" that converts DC power into communication power.
(1) Rectifier: Recently, a large number of diode converters have been used, which convert the power frequency power supply into DC power supply. It is also possible to form a reversible converter with two sets of transistor converters, because the power direction is reversible and can be regenerated.
(2) Flat wave circuit: In the DC voltage after rectifier rectification, it contains the pulsating voltage of 6 times the frequency of the power supply, and the pulsating current generated by the inverter also changes the DC voltage. In order to stabilize the voltage, inductors and capacitors are used to absorb the pulsating voltage (current). If the capacity of the device is small, if there is a margin for the power supply and the main circuit components, a simple flat wave circuit can be used to eliminate the inductance.
(3) Inverter: Contrary to the rectifier, the inverter converts the DC power into the communication power of the required frequency, and the 3-phase communication output can be obtained by making the 6 switching devices on and off at the confirmed time. Take a voltage-type PWM inverter as an example to show the switching time and voltage waveform.
The control circuit is a circuit that supplies power to the main circuit of the asynchronous motor (voltage and frequency can be adjusted) to supply control signals, which consists of a "frequency and voltage operation circuit", a "voltage and current detection circuit" of the main circuit, a "speed detection circuit" of the motor, a "drive circuit" that amplifies the control signal of the operation circuit, and a "maintenance circuit" of the inverter and the motor.
(1) Calculation circuit: Compare the external speed, torque and other instructions with the current and voltage signals of the detection circuit to determine the output voltage and frequency of the inverter.
(2) Voltage and current detection circuit: detect voltage and current with the main loop potential barrier.
(3) Drive circuit: the circuit that drives the main circuit equipment. It is blocked from the control circuit to make the main circuit equipment on and off.
(4) Speed detection circuit: the signal of the speed detector (TG, PLG, etc.) installed on the shaft of the asynchronous motor is the speed signal, which is sent to the operation loop, and the motor can be made to work according to the command speed according to the instruction and operation.
(5) Maintenance circuit: detect the voltage and current of the main circuit, and when there is an abnormality such as overload or overvoltage, in order to avoid damage to the inverter and asynchronous motor, the inverter will stop working or press the voltage and current value.
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My name is Inverter, and among the many new energy-saving products, I am known as the "energy-saving forward" for my excellent function.
In today's world, extreme disasters occur frequently, with melting glaciers, rising sea levels, persistent droughts, and heavy rainfall.
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