GW Instek SPS Series User Manual
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4. THEORY OF OPERATION (See Figure 4-1)
z Block Configuration of SPS- System
The SPS-Series comprise a Bridge rectifier, a Pulse Width Modulation, a Driver Circuit, a Driver Transformer,
a Rectifier Circuit, a Voltage Control Circuit, a Current Shunt, an Output Filter, a Voltage/Current Adjusting
Circuit, a Buffer Circuit, an Error Amplifier, an Opto-Isolator, and an Auxiliary Switching Supply and etc.
z Component List for each circuit configuration
Bridge Rectifier:
BD101.
Pulse Width Modulation:
U102.
Driver Circuit:
T104, Q105~Q108.
Driver Transformer:
T301.
Rectifier Circuit:
D301,D3011.
Voltage Control Circuit:
Q303.
Current Shunt:
R341.
Output Filter:
Common Choke L302, C325.
Voltage/Current Adjusting Circuit:
U302.
Buffer Circuit:
U302, Q301.
Error Amplifier:
U301, U303.
Opto-isolator:
U304.
Auxiliary Switching Supply:
U201, U202, T201.
OVP:
U401, U402
Remote Control:
RL401, D402