High Voltage Bias Insulation Resistance Evaluation System

Overview of Equipment

The High Voltage Bias Insulation Resistance Evaluation System is a measurement system used to evaluate the insulation of insulation material and the reliability of the electro-chemical migration phenomenon that results in insulation-failure due to moisture absorption, etc., associated with an increase in the system voltage in connection with electronic parts and energy efficiency.

The demand for power devices is increasing as automobiles become more electronic based and the market demand for energy-efficient home appliances increases.
In terms of more electronic-based automobiles, power devices (IGBT) for electric and hybrid vehicles continue to be developed, ECU power devices continue to evolve, and miniaturization technology used to store more ECUs in a tight body space continues to grow.
Meanwhile, we are seeing greater energy efficiency (using GaN, SiC, etc.) in power devices used in air conditioners, refrigerators, LCD TVs, and other home appliances.

The need for reliability evaluation of mounting substrates with high heat radiation properties and insulation material used in power devices is being reconsidered, and the importance of the continuous measurement of insulation resistance using this system is gaining attention.
This system enables measurement under high-voltage of 2.5 kV with high accuracy. In addition, it is equipped with a stress voltage control function that enables a slow voltage application to control overshooting at a high voltage and a leak touch function that detects momentary leak current.
A protective electronic circuit unit minimizes errors in voltage application and provides greater safety when a short circuit occurs.

Features

Continuously energized scanner relay system and a measuring instrument that supports international standards to ensure high-accuracy measurement.
Constant stress voltage (stress voltage, measurement voltage) can be set in a wide range from 50 V to 2,500 V.
Equipped with stress voltage control function.
To protect the sample and ensure safety, a 2-second wait is added every 100 V when the stress voltage is increased, thereby providing a gradual increase.
Equipped with a high-speed leak detection function using a leak touch detection function.
Edit and view real-time data with the "E-Graph" special statistical processing software.
Linked with an environmental test chamber for enhanced operability and safety.

Evaluation test case

Applicable devices

1. Power device mounting PCB

Substrate material
- Heat dissipation substrate (ceramic substrate, aluminum substrate, etc.)
- Resist material
- Solder material

Sealing material
- Semiconductor sealing material
- Mold resin material

2. Power device supporting material

With the increase of hybrid vehicles and electric vehicles, automobiles are using more electronics and are equipped with over 100 ECUs. Because hybrid and electric vehicles are exposed to rigorous environments with high temperatures for long periods, the sealing material and substrate material must be able to withstand these environments and protect such devices. In addition, these vehicles use power devices with a large current of several hundred amperes, so there is a growing demand for material with high insulation performance, never-before-seen long-term heat resistance performance to withstand high temperatures, and heat dissipation performance.

Specifications

Please scroll horizontally to look at table below.

	High-voltage (2.5 kV) specifications
Number of channels	Standard 25 channels (maximum 50 channels per rack)
Channel control	25 channel control
Resistance measurement range	2×10^（5） to 1×10^（15）Ω or more (when 100 V is applied) 5×10^（6） to 1×10^（14）Ω or more (when 2500 V is applied)
Measurement voltage	50 to 2500 V DC (50 to 200 V in 0.1 V increments, 200 to 2500 V in 1 V increments)
Measurement time	25 channel measurement/80 sec. + charge time
Leak touch detection function	Constant detection at 20 msec or more
Stress voltage control function	Increased in 2-second wait increments every 100 V
Measuring instrument	Keithley (Tektronix, Inc.)
Safety specifications	Safety specifications linked with temperature and humidity chamber can be supported separately. Contact an ESPEC sales representative for details.
Outside dimensions	Cabinet: W530×H1750×D940mm Relay unit: W500×H1705×D600mm

Caution: Uses high voltage. Electric discharge can occur in a high temperature environment and due to the distance between terminals.
Pay attention to the test conditions and sample shape.

Dedicated High Temperature Reverse Bias Test System is available for power device evaluation.: This can measure and evaluate leak current behavior under stress conditions due to high temperature and high voltage in time dependent breakdown tests of insulating film of power devices.
Reverse bias testing can be performed with a maximum testing temperature of 350°C and a maximum testing voltage of 3 kV.