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www.cleverscope.com
Cleverscope Ltd
Phone +64 9 524 7456
Mob +64 21 1777 367
Email [email protected]
21A Lancing Rd, Sandringham
P.O. Box 26-527
Auckland 1025
New Zealand
22 Apr 2018 v1.1
Using the CS1090 500V Bridge
IMPORTANT
: The CS1090 generates lethal voltages. Do not touch any cables or metal during operation.
Summary
The CS1090 is used to demonstrate the CS448 in use. The CS1090 includes two half bridges with BNC
connections to several interesting circuit nodes including the upper and lower gate drives, the two half
bridge switched nodes, and an across-bridge connection.
The Power switch is used to turn on the
19V power source. Up is OFF.
A CS448 black digital RJ45 cable can be
plugged into the CS1090 and into the
oscilloscope to display the gate drive
control signals.
When the internal power supply is greater
than 30V the HV Led indicator is on.
The Link port uses a Mini Din 8 plug and
USB adaptor to the PC for control. The
installation for the USB driver and control
program is detailed in a later section.
The two half bridges are labelled 1 and 2
respectively. The SW sockets switch
between 0V and 500V with a rise time of
about 7ns. SW 1-2 is between the two
switching nodes, and switches
500V.
The G1 and G2 sockets are the Gate
Drives, l = low side and h = high side.
I1h probes the high transistor switch
current, and I1l probes the low side
transistor switch current. D1l and D2h
probes the Driver chip. A series resistor of
10 Ohm limits current. The Gate current is
(D1h-G1h)/10. From this gate charge can
be calculated.
