Verification Circuit for DC Current Clamp Calibration

The patent implements a feedback mechanism by providing a known test current through a conductor with predetermined intensity that passes through the current clamp. The clamp's measurement is compared against the known test value, allowing verification of measurement accuracy. This feedback loop enables detection of calibration drift, damage, or misconfiguration by identifying discrepancies between expected and actual readings.

The patent creates a simplified copy or model testing scenario using a separate conductor carrying a known test current. Instead of relying on the complex live photovoltaic string for verification, a controlled test current copy is generated through the verification circuit. This allows independent validation of the current clamp's functionality without requiring actual photovoltaic system operation or complex measurement setups.

The patent extracts the verification function from the main current clamp device by providing a separate, dedicated verification circuit. The test conductor with predetermined intensity and associated switching mechanism are distinct from the primary measurement functionality. This separation allows the verification system to be added independently without fundamentally redesigning the current clamp itself, thereby limiting the increase in overall system complexity.

The verification circuit uses simple, inexpensive components including a test conductor with known resistance, a basic switching mechanism, and a power source. These are straightforward elements that can be easily implemented without complex electronics. The test conductor itself can be a simple wire or trace with predetermined resistance value, requiring no sophisticated manufacturing or calibration, thus adding minimal complexity to the system.