4.8
46
4.8.7 PCb1_PwM Circuit (0558038317)
PWM / IGBT Gating signal
This section controls the frequency and width of the gating signal supplied to the IGBTs.
The circuit receives the current reference signal from the current reference and error amplifier.
This circuit is triggered on from the microcontroller. In the event that there is an over current condition the
PWM chip can be shut down from either the microcontroller or from the Protection circuit (see Protection
Circuit section XX)
The PWM circuit receives an enable signal from the microcontroller chip to begin the output of pulses that
are then sent to the Power Board via the ribbon cable.
The PWM chip receives the current reference signal on pin 1, the ERR pin, which it receives from the error
amplifier.
Adjustment
Adjust R29 to read 38 KHz at TP1
Adjust R43 to read 1.45 VDC at TP3
SECTION 4
DESCRIPTION Of OPERATION
Содержание PowerCut 1600
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Страница 136: ...6 0 136 section 6 replacement parts 6 3 Front 0558007540...
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Страница 159: ...159 section 7 mechanized conversion 20 Trim all tie wraps and replace the unit s cover...
Страница 166: ...10 166 SECTION 9 General information 10 3 Ohm s and Watt s Laws...
Страница 171: ...10 171 10 6 Ohm Testing SECTION 9 General information...
Страница 172: ...10 172 10 7 Diode Testing SECTION 9 General information...
Страница 173: ...10 173 10 8 Ripple SECTION 9 General information...
Страница 174: ...10 174 10 9 Voltage Measurement SECTION 9 General information...
Страница 178: ...10 178 IGBT Tester Schematic 10 10 1 IGBT Testing SECTION 8 General information...
Страница 182: ...182 revision history Original release 11 2008 1...