Quantum 9732 User Manual

9732 Parallel Configuration for Increased Current Output

NOTE: If the proper diodes are not implemented (outlined below), damage may occur resulting in a void of

warranty. If in doubt, contact Quantum Composers for additional information.

Scope:

This document overviews the basic theory and operation pertaining to wiring output channels A & B in parallel for
the purpose of increasing output current.

Theory:

The 9732 Series Current Generator allows for the outputs on Channels A & B to be wired together in a parallel
configuration; thus, potentially allowing for current levels up to 12 Amps through the load. This can be
accomplished ONLY with the implementation of 2 external blocking diodes. When operating in this mode, the
limitations on each channel remain constant; although, the current settings will now be additive through the
load. The user may also incorporate a “piece-wise” current waveform by properly altering the pulse widths and
delays.

The following example setup represents the potential capabilities of this configuration:

Channel Parameters

Load Parameters

Diode Characteristics

CHA: Amplitude = 5 Amps

Impedance ≤ 3 Ω (includes cabling)

Forward Voltage Drop ≤ 1V

CHA: Width = 0.0001000 s

Reverse Voltage Breakdown ≥ 30V

CHA: Delay = 0 s

DC Current Rating ≥ 30A

CHB: Amplitude = 5 Amps

CHB: Width = 0.0001000 s

CHB: Delay = 0 s

Figure 1- Parallel Schematic Representation Figure 2 – Resulting Current Waveforms

Implementation:

The figure shown below represents the recommended wiring to achieve the parallel configuration. Note that the

blocking diodes are placed immediately at the output on each channel’s positive terminal. To prevent damage to

the 9732, it is EXTREMLY important that the anodes of both diodes be connected to the positive channel
terminals (shown below). Refer to the following list of suggested diodes to use in this configuration:

Suggested Diodes Used at D1 & D2:

-On Semiconductor: MBRB4030T4G

-STMicroelectronics: STPS30M60ST

-Vishay: VT4045BP-M3/4W

Voltage Monitors:

As seen below, the voltage monitors of either channel may be placed before or after the blocking diodes,
depending on what measurements are required. If the voltage prior to the diodes is to be monitored, connect
the positive voltage monitor to the anode of the corresponding blocking diode. If the voltage at the load is to be
monitored, connect the positive voltage monitor as close to the load as possible. Connecting the voltage
monitors as shown below allows one to monitor both the voltage across the load as well as the inherent voltage
drop across the blocking diodes.

Current Monitors:

The current monitors on each channel represent each channel’s individual current. The total current through the
load can simply be measured as the summation of the two current monitor signals.

Figure 3 – Parallel Configuration Wiring