Lincoln Electric SVM112-B service manual Figure E.8 Power Board

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E-8				E-8
	THEORY OF OPERATION
		FIGURE E.8 – POWER BOARD
		INPUT	MAIN	OUTPUT
		RECTIFIER
			TRAMSFORMER	RECTIFIER
	INPUT	AND
	CONTACTOR	RECONNECT		CHOKE POSITIVE
			LEFT
	THREE		SWITCH
			BOARD
	PHASE

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INPUT		FET
POWER		ASSEMBLY
INPUT	AUX.	CT
	TRANS
LINE
SWITCH		RIGHT
		SWITCH
PROTECTION	FAN	BOARD
BOARD

FET

ASSEMBLY

POWER

BOARD

CONTROL

BOARD

WATER

COOLERDISPLAY

BOARD

PC

INTERFACE

NEGATIVE

SHUNT

SNUBBER AND

SENSE LEADS

LCD

DISPLAY

KEYPAD

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OVERLAY

WF1 WF2

POWER BOARD

The Power Board provides gate drives for the FETs on the Switch Boards. It does so based on the “turn-on” signals it receives from the Control Board. One func- tion of the Power Board is to isolate the Control Board from the Switch Boards. The Power Board also pro- vides the other printed circuit boards with the DC volt- age supply they require.

NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

POWER WAVE 450