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#148635 - 07/29/01 11:23 AM HID Ballasts Schematics: CW 1 and 2 lamp Ballasts
Scott35 Offline

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Schematic of the Constant Wattage Isolation Transformer type Ballast for operation of one Mercury Vapor [MV] - ANSI type H##, or one Metal Halide [MH] - ANSI type M## lamp.

Similar to the Schematic in Fig. 4.1. above, except this one is for operation of two MV or MH lamps in series.

Note the secondary winding - the Reactor coil - is electrically isolated from the primary winding [or the "Line Input"].
The Resistor[s] shunting the Capacitor[s] are just to drain the residual charges from the Capacitors after power is removed - hence the name "Draining Resistors". They perform no other useful function in these circuits other than drain the Caps.

Side Note: They would create an RC bandpass filter in this state, but that's not the intended result - just a simple side effect

Please feel free to ask questions, make comments, or participate in discussions on these Ballasts in the Theory area under the topic heading of:

Discussions on: HID CW 1 and 2 lamp Ballasts

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Scott SET posted 07/29/2001 11:18:00 PDT
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