Leakage Protection Residual Current Monitoring Unit

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.

Model:XKCA-01-MD

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Product Description

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.

Features

■ Single Supply +5 V
■ Dual digital open-drain output, 20mAAC/6mADC trip indication
■ 3-phase primary conductors on module (typ. 32A, max. 40A)
■ PWM output for DC residual current value indication (0~30mA)
■ Error output for system fault indication
■ Mounted on PCB board
■ Self-test function

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-PD

■ Applicable for UL2231 residual current requirements

■ Components designed full-fill RoHS/REACH

Product Apperance

Typical Application Schematic：

Pin Definition：

Pin-No	Pin Name	Function
1	Error	■Open-collector output pin for indicating the system fault condition ■When no system fault, this pin will be conducted to GND ■When system fault occured, this pin will be high-impedance
2	TEST-IN	■When this pin been conducted to 0VDC, module will calculate the zero-point-drift and store the value to register in the MCU to finish the calibration operation. ■After calibration finished, system will internally generate simulated residual current, to check whether module can do the correct response. During this procedure, X20-OUT & X6-OUT will turn to high-impedance if module working correct. Attention: ■When using the TEST-IN function, the main circuit must be cut-off to ensure no residual current flow ■When using this pin function, please follow the time diagram figure
3	X6-OUT	■If residual current exceeds pre-set DC trippling value (for this module typically 4.5 mADC), this output is in a high-impedance state ■When the total residual current r.m.s exceeds pre-set all-current trippling value, this output is in a high-impedance state ■When system-fault happens, this output is in a high-impedance state ■For other normal conditions, this output is in a low level(GND)
4	X20-OUT	■If residual current exceeds pre-set all-current tripping value (for pure-AC typically 17.8 mAAC), this output is in a high-impedance state ■When system-fault happens, this output is in a high-impedance state ■For other normal conditions, this output is in a low level(GND)
5	GND	■Ground
6	VDD	■Module power supply, standard voltage 5VDC ■Voltage input required to be within 4.85~5.15VDC, power output capability > 100mA ■Power supply ripple ≤ 150mV (It is suggested to use LDO circuit, for reference IC LP2985A-50DB)
7	PWM	■Indicating DC residual current component with duty-cycle with 8kHz PWM ■Output resolution = 3.33%/mADC from 0~30mADC ■Accuracy about ±0.5mA
8	N.C.	■Not used

Electrical/Reliability Characteristics：

	Char	Min	Typ	Max	Unit
1	Primary nominal RMS current (1phase / 3phase)		32	40	A
2	Supply voltage	4.85	5	5.15	V
3	Ambient operation temperature	-40		+105	℃
4	Ambient storage temperature	-20		+65	℃
5	Static Power Consumption			110	mW
6	Electrical clearance;Primary-Primary	6.5			mm
7	Electrical clearance;Primary-Secondary	10			mm
8	Creepage distance;Primary-Primary	8			mm
9	Creepage distance;Primary-Secondary	10			mm
10	Voltage input, low level	0		0.6	V
11	Voltage input, high level	4.2		5	V
12	Theoretical design life	20			Yr
13	Operating altitude			4000	m

Trip-Current (residual current related characteristics)：

	Wav	Freq	Min	Typ	Max	Unit
1	AC	50Hz	15	17.8	20	mA
2	A0	50Hz	11	17	26	mA
3	A90	50Hz	10	18.5	27	mA
4	A135	50Hz	10	22.9	28	mA
5	2PDC	-	3.5	5.0	7	mA
6	3PDC	-	3.1	4.5	6.2	mA
7	S-DC	-	3.0	4.5	6.0	mA

Trip-Time (residual current related characteristics)：

	Wav	Freq	Current	Typ	Max	Unit
1	AC	50Hz	30mA	50	1000	ms
2	AC	50Hz	60mA	16	100	ms
3	AC	50Hz	150mA	15	60	ms
4	AC	50Hz	5A~100A	8.5	60	ms
5	A0	-	42mA	25	100	ms
6	A0	-	84mA	18	60	ms
7	A0	-	210mA	10	60	ms
8	A0+DC	-	42mA+6mADC	18	60	ms
9	A0+DC	-	84mA+6mADC	15	60	ms
10	A0+DC	-	210mA+6mADC	15	60	ms
11	S-DC	-	6mA	48	1000	ms
12	S-DC	-	60mA	16	100	ms
13	S-DC	-	300mA	8.5	60	ms
14	2PDC/3PDC	-	60mA	20	100	ms
15	2PDC/3PDC	-	120mA	15	60	ms
16	2PDC/3PDC	-	300mA	12	60	ms
17	2PDC/3PDC	-	5A~100A	12	60	ms

Product Dimension (mm)：

Timing Diagram：

■ T0 as the waiting time for system stablization, T0≈ 270ms

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

■ T2 as the calibration and self-test order time, it is suggested 50ms ≤ T2 ≤ 100ms

■ T3 as the waiting time for the self-test DC, T3≈ 200ms, it is suggested to read X6-OUT after 300ms

■ T4 as the waiting time for the self-test AC, T4≈ 690ms, it is suggested to read X30-OUT after 300ms

■ T5 as the AC self-test indication duration time, T5 ≈ 1580ms

■ T6 as the DC self-test indication duration time, T6 ≈ 1090ms

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