Application Notes
MicroHarmony Cell Sizes 40 - 260A Manual
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The following circuitry resides on the cell control board, and handles the heat sink temperature monitoring.
Sync signal from EPLD resets and synchronizes the 600Hz ramp generator U100 circuit. Ramp at TP34 starts at
4.88V and ramps up linearly to 8.8Vpk. At 8.8V, the ramp decays quickly back down to 4.88V and repeats. Period
of waveform is 1.667msec. The thermodisc resistance varies with temperature. The non inverting amplifier U3:B
circuit converts this variable resistance into a dc voltage which is compared to the ramp. U2 comparator generates a
PWM output at TP35. The PWM signal connects to the EPLD which sends this data over the fiber optic link to the
main controller. The CCB does not shut the cell down in the event of an over temperature condition.
Figure 9-1: Heat Sink Temperature Monitoring Circuitry
Thermodisc
(installed on HS)
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