Ac Line Current / Power Vs. Voltage - PRG BAD Boy Field Service Manual

AC Line Current / Power vs. Voltage

TEST
1
2
3
4
5
6
7
8
9
10
11
12
Notes:
• Tested while running all motors except Intensity/Iris/Frost functions to allow ballast to remain
stable at 1400W output to lamp.
• Under-Voltage Lock-Out (UVLO)
- Ballast UVLO = 165V/50Hz, 185V to recover
- 24VDC LVS UVLO = 75V/50Hz, 85V to recover
About UVLO
UVLO is an acronym for Under-Voltage Lock-Out.
On a SMPS (Switch-Mode Power Supply) the input power is regulated by a PWM (Pulse-Width
Modulator). Input power is held constant by the PWM at a value equal to the load power divided by
the efficiency of the SMPS (usually .85 to .95). The Bad Boy Electronic Ballast and the 24V DC LVS
(Low-Voltage Supply) are both SMPS units.
In the table above, the input power for the Bad Boy stays constant at just over 1700 Watts throughout
the usable voltage range. As input voltage is reduced further, the input current rises to unacceptable
levels for the wiring, the circuit breaker, and the PWM transistor. There are fuses on the inputs of each
SMPS that prevent fires in case of shorts on the PCB or overvoltage at the input, but these could also
be blown by a voltage sag that would cause the input current to rise. Enter the UVLO. It is a dedicated
electronic circuit added to the SMPS to monitor its input voltage and shut down the PWM if leaving it
on would cause damage.
Every high-power SMPS needs this circuit to prevent damage to the components, not just semi-
conductors, but current sensing resistors, too.
0 2. 9 8 1 2. 0 0 05
VOLTS FREQ
170 50Hz
180 50Hz
200 50Hz
200 60Hz
210 60Hz
220 50Hz
230 50Hz
240 50Hz
240 60Hz
250 50Hz
260 50Hz
270 50Hz
TECHNICAL
AMPS VA
10.27 1746
9.62 1732
8.56 1712
8.57 1714
8.16 1714
7.77 1709
7.47 1718
7.14 1714
7.16 1718
6.83 1708
6.62 1721
6.45 1742
A
S
PECIFICATIONS
POWER PF
1735 0.998
1721 0.995
1713 0.994
1709 0.996
1707 0.997
1704 0.991
1708 0.998
1705 0.993
1702 0.996
1704 0.992
1701 0.989
1689 0.966
97