Test & Measurement Applications
Variable DC Power Supplies for High-Voltage DC Bus Testing
Apply controlled DC voltage to power-electronics development fixtures and evaluate bus-powered circuits across their intended range. Voltage headroom, charging current and stored energy shape the source and the surrounding test system.
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How Is a High-Voltage DC Bus Supplied for Testing?
A controllable DC source energizes the bus for development and validation. The fixture manages capacitor charging, stored energy and access protection around the source and the device under test.
Supply path: high-voltage source → rated isolation / precharge arrangement → DC bus and DUT.
At the bus: DC-link capacitance, rated discharge path and voltage measurement. Regenerative tests need additional energy handling. This is a functional overview, not an installation wiring diagram.
Conceptual test architecture, not a wiring diagram. The fixture requires appropriately rated precharge, discharge, protection and measurement provisions.
What to Consider When Choosing a DC Power Supply for High-Voltage DC Bus Testing
Bus voltage and power
Maximum applied voltage, steady load current, power at each operating point and input configuration.
Capacitance and precharge
DC-link capacitance, charging profile, precharge components and discharge time.
Protection and energy flow
Interlocks, rated connections, isolation requirements, residual voltage and any regenerative operation.
Voltage capability or usable operating range?
Select a source that covers the required voltage and current together at the test point. AC input options can affect available power. A higher-voltage rating alone does not establish the required continuous output.
How much energy is stored in the DC link?
Stored energy is E = ½CV². For illustration, 1000µF at 400V stores 80J, and the same capacitance at 800V stores 320J. Plan controlled charging, discharge verification and access interlocking around the actual system energy.
Source operation or regenerative testing?
A source-only supply provides energy to the bus. Inverters or converters that return energy require a separate rated dissipation/absorption solution or a bidirectional test source. Do not assume an output-off command removes stored bus voltage.
Compare Power Supplies for This Application
eTM-5005C 500V 5A Variable Bench DC Power Supply
Bus-powered circuits up to 500V. Adjustable 0–500V and 0–5A with CV/CC operation, low ripple/noise, output switching and optional programmable interfaces.
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eTM-8006C 800V 6A Variable Bench DC Power Supply
Extended-voltage development fixtures. Adjustable 0–800V and 0–6A for higher-voltage source tests within the selected configuration’s power capability. Includes output switching, protection functions and controlled cooling.
View Options & Buy OnlineETOMMENS DC Power Supplies for High-Voltage DC Bus Testing
The 5005C and 8006C provide adjustable high-voltage output with CV/CC operation, low ripple and noise, and independent output switching. Temperature-controlled cooling and overvoltage, overcurrent, overpower, overtemperature and short-circuit protection support laboratory source operation. Optional communication interfaces support repeated DC setpoints within the test fixture.
ETOMMENS serves small and medium-sized businesses, large enterprises and multinational groups, with customers across North America—including the United States and Canada—Europe and the Middle East.
Our DC power supply range supports laboratory development, equipment testing and production applications, with technical support and customized solutions for different project requirements.
Where to Buy DC Power Supplies for High-Voltage DC Bus Testing
You can buy ETOMMENS DC power supplies for high-voltage DC bus testing online at VariableDCPowerSupply.com. In-stock models dispatch within 1–3 business days after payment, with approximately 10 business days in transit. Free worldwide DDP shipping includes customs clearance, import duties and taxes.
Lead times for custom configurations are confirmed with the quotation.
Related: 500V DC Power Supplies. Explore the wider ETOMMENS variable DC power supply range.
Frequently Asked Questions
Can I use an 800V supply for a nominal 800V battery system?
Only if the entire intended voltage range fits. A system described as 800V may operate above 800V, so its maximum test voltage may require a higher-rated source.
Is this a hipot or insulation tester?
No. These products are adjustable DC sources for suitable circuit and bus tests. Dedicated dielectric-withstand testing requires the specified test instrument, safety functions and measurement capability.
Can the supply absorb inverter braking energy?
Do not assume source models can sink returned energy. The test system needs a separately rated path or a suitable bidirectional source.
Does output off make the bus safe to touch?
No. Capacitors can remain charged. The fixture must provide a rated discharge method and voltage verification before access.