Voltage Control Unit for Dielectric Strength Testers

Product Specifications

Technical details and manufacturing context for Voltage Control Unit

Definition

The Voltage Control Unit is a critical subsystem within an Industrial Dielectric Strength Tester responsible for generating, stabilizing, and precisely modulating the high-voltage output applied to test specimens. It ensures the tester delivers accurate, repeatable voltage levels as required by dielectric strength testing standards, directly influencing the reliability and safety of insulation quality assessments in electrical equipment manufacturing. The unit typically receives a low-voltage input signal or setpoint from the tester's control system. Using power electronics (such as high-voltage transformers, solid-state switches, or inverter circuits) and feedback control loops, it amplifies and shapes this signal to produce a stable, high-voltage AC or DC output. Continuous monitoring via voltage sensors allows for real-time adjustment to maintain the target voltage despite load variations. The unit is designed for industrial environments, with an operating temperature range of -10 to 50 °C and storage from -20 to 70 °C. It operates on a universal input voltage range of 85–265 V AC (50–60 Hz) and provides an adjustable output from 0 to 1000 V AC with an accuracy of ±0.5%. Load regulation is ±0.2%, line regulation ±0.1%, and response time ≤10 ms. The unit features insulation resistance ≥100 MΩ at 500 V DC and dielectric strength of 2.5 kV for 1 minute. It is rated IP20 for indoor use and weighs between 1.5 and 2.0 kg. Key materials include electronic components, insulating materials (epoxy, ceramics), copper windings, and aluminum heat sinks. For procurement, verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The Voltage Control Unit receives a low-voltage setpoint from the tester's control system. It uses power electronics, such as high-voltage transformers, solid-state switches, or inverter circuits, to amplify and shape the signal into a stable high-voltage AC or DC output. Feedback control loops continuously monitor the output via voltage sensors, adjusting in real time to maintain the target voltage despite load variations. This ensures accurate and repeatable voltage levels for dielectric strength testing.

Common Materials

Electronic components (ICs, resistors, capacitors), Insulating materials (epoxy, ceramics), Copper windings, Aluminum heat sinks

Technical Parameters

Parameter	Typical range	Notes & selection driver
Input Voltage Range	85–265 V AC	Universal input for global mainsIEC 61000-4-11
Output Voltage Range	0–1000 V AC	Adjustable for dielectric testing
Output Voltage Accuracy	±0.5 %	Ensures test repeatability
Output Frequency	50–60 Hz	Mains frequency operation
Load Regulation	±0.2 %	Stable under varying load
Line Regulation	±0.1 %	Stable with input variations
Response Time	≤10 ms	Fast transient response
Operating Temperature	-10–50 °C	Industrial environmentIEC 60068-2-1
Storage Temperature	-20–70 °C	Non-operatingIEC 60068-2-2
Relative Humidity	20–80 % RH	Non-condensingIEC 60068-2-78
Protection Rating	IP20	Indoor use onlyIEC 60529
Insulation Resistance	≥100 MΩ	At 500 V DCIEC 60255-5
Dielectric Strength	2.5 kV	Input to output for 1 minIEC 60255-5
Weight	1.5–2.0 kg	Compact for panel mounting

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

High-Voltage Transformer
Steps up the input voltage to the required high-voltage level.

Material: Laminated silicon steel core, copper windings, insulating oil or epoxy
Control Circuit Board
Processes setpoint signals, implements feedback control algorithms, and drives power components.

Material: FR4 PCB, integrated circuits, discrete semiconductors
Voltage Feedback Sensor
Measures the actual output voltage and provides a signal to the control circuit for regulation.

Material: Precision resistors, capacitive dividers, or Hall-effect sensors
Power Switching Stage
Electronically switches or modulates the power to the transformer to control output voltage.

Material: IGBTs, MOSFETs, or thyristors mounted on heat sinks

Manufacturers of Voltage Control Unit

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Frequently Asked Questions

What is the input voltage range of the Voltage Control Unit?

The unit accepts a universal input voltage range of 85–265 V AC, operating at 50–60 Hz, as per IEC 61000-4-11. This allows use with global mains supplies.

What output voltage range does it provide?

The output voltage is adjustable from 0 to 1000 V AC, suitable for dielectric strength testing. The accuracy is ±0.5% to ensure test repeatability.

What are the environmental operating limits?

The unit operates in temperatures from -10 to 50 °C and can be stored from -20 to 70 °C. It is rated IP20 for indoor use and withstands non-condensing humidity of 20–80% RH.

How does the unit maintain voltage stability?

It uses feedback control loops with voltage sensors to monitor the output continuously. Load regulation is ±0.2%, line regulation ±0.1%, and response time is ≤10 ms, ensuring stable voltage under varying conditions.

Data Basis

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pressure:	Atmospheric to 1.5 bar absolute (sealed enclosure)
other spec:	Input voltage: 100-240V AC ±10%, 50/60Hz; Output voltage: 0-10kV DC adjustable; Regulation accuracy: ±0.5% of setpoint; Ripple: <1% RMS
temperature:	-20°C to +85°C operating, -40°C to +105°C storage

Voltage Control Unit

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