Summary of NJU7890 CAN DIRECTLY DETECT 1000V VOLTAGE WITH EASE AND HIGH PRECISION
New Japan Radio (NJR) developed the NJU7890, a single-package high-voltage monitor IC that directly detects up to 1000 V with ±1% attenuation-rate precision. By integrating a 30 MΩ high input resistance and a high-precision amplifier, it replaces discrete resistor networks and op-amps, reducing ECU area, improving matching precision, and benefiting inverter and battery systems in hybrid and electric vehicles. Mass production has begun.
Parts used in the NJU7890 Project:
- NJU7890 high voltage monitor IC (integrated high input resistance and amplifier)
- External detection resistors (used in conventional discrete designs, referenced for comparison)
- Operational amplifiers (used in conventional discrete designs, referenced for comparison)
- ECU mounting area / PCB (application context for the IC)
New Japan Radio (NJR) has developed a high voltage monitor IC “NJU7890” that can detect DC 1000V voltage and output with high precision, and announced that mass production has begun.
Small size and high performance have been required for inverters and batteries in eco-friendly cars such as hybrid cars and electric cars. Among them, the voltage monitor module has been composed of multiple detection resistors and operational amplifiers discretely, so there have been some problems, for example, the area of high voltage circuits has increased in ECU and the discrete configuration has caused the deterioration of the attenuation rate precision. NJR has developed a new IC NJU7890 with high input resistance as a one-package solution and high precision, and it has entered mass production.
The voltage monitor block with NJU7890 improves the performance of eco-friendly cars and makes them smaller and lighter.
Features
Realizes High voltage monitor up to 1000V and high precision of attenuation rate ±1%
Conventional high voltage monitor circuits have required multiple detection resistors, operational amplifiers, etc. to construct high input resistance with discrete parts. In order to ensure multiple parts and creepage distance, there have been some problems with external parts, for example, the mounting area has increased in the ECU and the error of each part has caused the deterioration of the attenuation rate precision.
The NJU7890 realizes high precision of resistance matching by integrating a high input resistance of 30 MΩ and a high precision amplifier in one-package.
Read more: NJU7890 CAN DIRECTLY DETECT 1000V VOLTAGE WITH EASE AND HIGH PRECISION
- What voltage range can the NJU7890 monitor?
The NJU7890 can directly detect DC voltages up to 1000 V. - How precise is the attenuation rate of the NJU7890?
The NJU7890 achieves an attenuation rate precision of ±1%. - What input resistance does the NJU7890 provide?
The NJU7890 integrates a high input resistance of 30 MΩ. - How does the NJU7890 improve over discrete high voltage monitor circuits?
By integrating high input resistance and a high precision amplifier in one package, it reduces external parts, ECU mounting area, and improves resistance matching and attenuation precision. - In what applications is the NJU7890 intended to be used?
It is intended for inverters and batteries in eco-friendly cars such as hybrid and electric vehicles. - Has the NJU7890 entered mass production?
Yes, NJR announced that mass production of the NJU7890 has begun. - Why did conventional designs have increased ECU area?
Conventional designs required multiple detection resistors and operational amplifiers and ensured creepage distance, which increased the mounting area. - What problem did part errors cause in discrete high voltage monitors?
Errors of individual external parts caused deterioration of the attenuation rate precision.
