ESG-400
1-2 HVPS Board
The high voltage power supply (HVPS) is a switching mode power supply with series resonance circuit. It
provides a high DC voltage for the HF Generator. It contains:
• voltage line selection circuit, for automatic change between 110/230 VAC
• simple rectifier circuit
• PWM driving circuit
• driving circuits including a digital flip-flop stage for complete cycle driving
• power FET half-bridge, a series resonance circuit, output transformer and rectifying stage
• current and voltage monitors
• discharge circuit
1-3 Generator board
The Generator Board generates the HF output energy from a DC input voltage and contains:
• control circuit for generating start and driving pulses of “one cycle” sinus oscillator
• driving stage for power FET, parallel resonance circuit and series resonance circuit
• relays for switching between different transformer windings
• HF output voltage monitor and redundant HF voltage monitor
• HF output current monitor and redundant HF current monitor
• HF output phase monitor
• HF leakage current monitor
• spark monitor (SPM) supply circuit
• spark monitor for detecting positive and negative DC voltage offset
1-4 Relay Board
The Relay board is used to connect the active output socket to the generator board. It contains:
• connectors to every single HF output socket
• relays which are separating the non active output terminals from the active output terminals
• separating relays are forced guided relays with read-back contact in secondary circuit to control the relay
status
• contact quality monitor (CQM)
• transient voltage suppression (TVS) diodes in applied part
7.022.211 / ISSUE 5 41 / 110 Chapter 2: Block Description
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