Isolation Testing B-Type Leakage Sensor

Features

■ Single Supply +5 V

■ High and low level output

■ Self-test function

■ Mounted on PCB board

Applications

■ Ground fault detection

■ Electric vehicle charge station

■ Converter leakage current detection

Standard

■ Applicable for IEC 62752 residual current requirements

■ Applicable for IEC 62955 residual current requirements for RDC-MD

■ Components designed full-fill RoHS/REACH

Overview

An important safety function of these devices is monitor of the leakage current of the entire system from Power modules against earth. A defective system can become dangerous for people or cause fires. Before it comes so far, Power modules must be disconnect from the grid. The leakage current contains DC and AC components. Therefore an AC/DC-sensitive monitoring unit is necessary.

The XKCA Series Residual Current Detection Module is widely applicable, especially in public charging stations for electric vehicles, electric motorcycles, electric bicycles, charging fees, and power safety management. It offers simple usage and easy installation.

Typical Application Schematic：

Pin Definition：

Electrical/Reliability Characteristics：

Trip-Current (residual current related characteristics)：

Trip-Time (residual current related characteristics)：

NoTrip-Time (residual current related characteristics)：

Product Dimension (mm)：

Note: Terminal wires can be customized.

Timing Diagram：

■ VDD power-up speed ≤ 5ms/V

■ T1 as the waiting time, it is suggested T1 ≥ 100ms

■ 50ms≤ T2≤100ms, cal pin low time greater than 50ms, the product begins to enter the zero phase

■ T3≥500ms and wait for the zero to complete

■ T4≈400ms, and the Test self-test signal enable must wait until T3 is complete before it can be applied

■ TRIP pin output high duration Tx = 100mS (verify self-test function)

■ Ty=100ms is the TRIP pin high level fading time (disables self-test verification)

Self-Test Circuit：

■ 2 widing on the ZCT to generate simualted DC residual current
■ By using VDD to generate typical value = 6.53 mADC simulated residual current
■ This current is the most restricted tripping condition to test whether system is working correct

Digital Signal Flip Threshold：

■ For avoiding the signal oscillation, tripping signal output flipping has been set with tripping threshold and recovery threshold

■ When tripping threshold  reached，the related X-OUT flip，and when the current decrease to the recovery threshold  , the related X-OUT flip again, back to low level state

■ is set as 100% typical tripping value, and  is set as 55% typical tripping value