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2.2 De s c ri pt i on o f f un c t i ona
Input: Connects from the power supply endpoint to the input terminal disk of the equipment.
1)
Input air switch: Controls the commercial power input equipment.
2)
Input filter: Input inductor and capacitor filter.
3)
Rectifier filter: Converts the input alternating current into direct current.
4)
Soft start: DC capacitor is charged slowly to reduce the impulse current.
5)
Inverter circuit: Converts the direct current into PWM waveform.
6)
Transformer filter: Boosts the output voltage of IGBT and outputs the voltage after LC filter.
7)
Output: The output voltage is transferred to the output terminal disk (or output copper bar)
8)
through the contactor.
Lightning protection device: Over-voltage protection, lightning protection, restraining surge
9)
current, absorbing spike pulse, etc.
Voltage sampling: Input voltage sampling conditioning circuit.
10)
SCR drive: Drive control circuit of soft start SCR.
11)
IGBT drive: Amplify PWM signals to drive IGBT power components.
12)
Voltage feedback: Steadily output voltage amplitude.
13)
Voltage/current sampling circuit: Sampling conditioning circuit of output voltage and
14)
current.
Power supply: Power supply of all PCB.
15)
Main control circuit: The processing of all input and output signals.
16)
Display: Touch screen display.
17)
EPO: Emergency stop signal.
18)
FUSE detection: Transmit the FUSE power-off signal to the control circuit for trip
19)
protection.
Over-temperature detection: Transmit the over-temperature signal to the control circuit for
20)
trip protection.
2.3 M ai n c ont r ol c i r c u i t
The main control circuit is divided into three parts: the protection sampling module, t h e
main control module and the display control module. The relationships between these three
parts are shown in Fig. 2-2.
Protection
sampling
module
l bl oc k di a gra m
Main control module
Fig. 2-2 Block diagram of control parts
3
Display
control
module
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