8ch High Common Mode Voltage (HCMV) Amplifier
The WPC HCMV Amplifier (including HCMV Amplifier-200 and HCMV Amplifier-275) is an amplifier module specifically designed for processing high common-mode voltage signals. This product features 8 ground-referenced channels and an isolated power supply design, making it particularly suitable for measurement applications in battery packs and fuel batteries.
Key Features
- Extreme High Common-Mode Voltage Support: Provides high common-mode voltage ranges of up to 200V or 275V, meeting the needs for high-voltage measurement.
- High-Safety Isolation Protection: Features 500V input protection and utilizes power isolation design to safeguard back-end equipment.
- Excellent Noise Suppression: Common-Mode Rejection Ratio (CMRR) is at least 90dB, effectively filtering out noise in high-voltage environments.
- Built-in Low-Pass Filter: Includes an integrated 100kHz low-pass filter to provide stable signal quality.
- Standardized Power Supply and Gain: Powered by 24VDC with a fixed gain (Gain) of 1, facilitating easy system integration.
Product Specifications and Features
The WPC 8ch HCMV Amplifier is designed for high-stability and high-safety measurements. Its main specifications are as follows:
- Power Input: 24 VDC
- High Common-Mode Voltage Range: 200 V or 275 V
- Number of Channels: 8 channels
- Gain: 1
- Input/Output Range: ±10 V
- Common-Mode Rejection Ratio (CMRR): ≥ 90 dB
- Input Protection: 500 V
- Bandwidth: 100 kHz (Built-in low-pass filter)
| Parameter | Symbol | Condition | Min. | Typ. | Max. | Unit | Description |
|---|---|---|---|---|---|---|---|
| Voltage Input Range | Vin | Vcs=12V | 0 | 5 | V | - | |
| Voltage Input Threshold | Vth | - | 20 | 40 | 50 | mV | - |
| Current Output Range | Iout | Vcs=12V | 0 | 200 | mA | - | |
| Current Source Power Input | Vcs | - | 5 | 9 | 12 | V | - |
| Amplifier Power Input | Vcc | - | 7 | 12 | 15 | V | Must be at least 2V higher than Vcs |
| Vsens Output Range | Vsens | Vcc = ±15V | 10 | 12 | V | Must be less than Vcc-2V | |
| Isens Output Range | Isens | Vcc = ±15V | 10 | 12 | V | - | |
| Current Output Precision | - | - | 5 | 10 | µA | - |
Pinout and Hardware Interface
Below is the interface configuration description for the WPC 8ch HCMV Amplifier:
When performing high-voltage measurements, ensure that all ground connections are correct and secure to avoid equipment damage or personal injury.
| Name | Function Description |
|---|---|
| Power In | 24VDC Power Input terminal |
| Signal Input | 8-channel high-voltage signal interface |
| Signal Output | 8-channel signal output interface (Gain = 1) |
System Connection and Applications
The figure below displays the connection method for the 8ch HCMV Amplifier in a typical battery pack measurement system:
Connection Diagram
Application Note
The WPC 8ch HCMV is primarily used for battery pack measurement. Since there is extreme series voltage within a battery pack, ordinary sensors have difficulty handling the high common-mode level relative to ground directly. This module safely converts the voltage difference signal in a high common-mode environment into a standard voltage signal relative to ground.
Advanced Features
Power & References
High Voltage Expansion
This series of modules supports high-voltage expansion applications. You can choose the corresponding model (HCMV-200 or HCMV-275) based on the total series voltage of the measurement point and use multiple modules together to expand the measurement channels.
