Battery monitoring instrumentation amplifier circuit diagram ISO120 and INA105 multiplexer 600V battery system

The circuit utilizes the ISO120 and INA105 instrumentation amplifiers to create a battery monitoring system for a 600V battery setup composed of 50 series-connected 12V batteries. This circuit is designed to detect charging and discharging conditions to prevent overcharging or over-discharging. The ISO120 isolates the single input voltage from the battery terminal, which is 12V, using a resistor divider made of two 10kΩ resistors to derive an e/2 voltage. This voltage is then sent to the INA105, which is configured as an inverting amplifier with a gain of 1. The output from the INA105, which is e/2, is directed to a multiplexer that controls the selection of the output.

The circuit described is a sophisticated battery monitoring solution that effectively manages and safeguards a high-voltage battery system. The ISO120 serves as an isolation amplifier, providing electrical isolation between the high-voltage battery system and the monitoring circuitry. This is crucial for safety and protects sensitive components from high voltage. The resistor divider, composed of two 10kΩ resistors, reduces the 12V battery voltage to a manageable level (e/2) that can be safely processed by the ISO120.

The INA105 is an instrumentation amplifier that further processes the isolated signal. Configured with a gain of 1, it maintains the integrity of the voltage level while allowing for precise measurement. The output from the INA105 is then fed into a multiplexer, which can select different battery voltages for monitoring purposes. This multiplexer is essential for managing multiple inputs from the series-connected batteries, enabling the system to monitor each battery's state without requiring additional isolation amplifiers for each battery.

The overall design ensures that the battery monitoring circuit can effectively prevent conditions that may lead to overcharging or over-discharging, thereby extending the lifespan of the battery system and enhancing operational safety. This circuit is particularly valuable in applications where large battery banks are utilized, such as in renewable energy systems, electric vehicles, and industrial power storage solutions. By ISO120 and INA105 instrumentation amplifier as shown, multiplexer constituted 600V battery system battery monitoring circuit. This circuit 50 in series 12V battery (ie, the total voltage 600V) charging and discharging detection to prevent overcharging or over-discharging. ISO120 for a single input voltage across the battery terminal voltage 12V by two 10k resistor divider to obtain e/2 voltage, after the isolation amplifier to the INA105. INA105 inverting amplifier connected to a gain of 1, the output e/2 to the multiplexer, the multiplexer to select the output control.